Sample records for mas mas mas

  1. UAM. Cartoteca "Rafael Mas". Inventario, 2011 2 UAM. Cartoteca "Rafael Mas". Inventario, 2011 3

    E-Print Network [OSTI]

    Autonoma de Madrid, Universidad

    #12;UAM. Cartoteca "Rafael Mas". Inventario, 2011 2 #12;UAM. Cartoteca "Rafael Mas". Inventario Madrid. En 2008 se incorporaron, también como donación de la #12;UAM. Cartoteca "Rafael Mas". Inventario://biblioteca.uam.es - Este inventario, disponible en soporte papel y en la red, en la dir

  2. MAS 07 Multi-Class SVM for Forestry Classification MAS 07.1 Overview

    E-Print Network [OSTI]

    California at Los Angeles, University of

    MAS 07 Multi-Class SVM for Forestry Classification MAS 07.1 Overview In this project, we propose (IFN). We will show one example on a national forest near Sedan (in France), and compare our result binary SVMs. In this project we use the One-Against-All (OAA) scheme, which consists of building one SVM

  3. Magnesium Silicate Dissolution Investigated by 29Si MAS, 1H-29Si...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Silicate Dissolution Investigated by 29Si MAS, 1H-29Si CP MAS, 25Mg QCPMG, and 1H-25Mg CP QCPMG NMR. Magnesium Silicate Dissolution Investigated by 29Si MAS, 1H-29Si CP MAS, 25Mg...

  4. Protein MAS NMR methodology and structural analysis of protein assemblies

    E-Print Network [OSTI]

    Bayro, Marvin J

    2010-01-01T23:59:59.000Z

    Methodological developments and applications of solid-state magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, with particular emphasis on the analysis of protein structure, are described in this thesis. ...

  5. 2. MONITORED ACADEMIC STATUS (MAS) Causal Event(s)

    E-Print Network [OSTI]

    Goodrich, Lisa V.

    Failure of either USMLE Step 1 or Step 2 (CK and/or CS) Noncompliance with PRB conditions Continuing and approved by PRB. Students on MAS may not serve on appointed committees at the School, are required to limit be approved by the PRB. When appropriate, the PRB will be responsible for working with the Society and

  6. MAS 108 Probability I Continuous random variables Summary

    E-Print Network [OSTI]

    Bailey, R. A.

    when a number is chosen at random from the interval [a,b], with all values equally likely. · p.d.f. f if x > b. · E(X) = (a+b)/2, Var(X) = (b-a)2/12. Normal random variable N(µ,2) (Lindley and Scott, TableMAS 108 Probability I Continuous random variables Summary Uniform random variable U[a,b] · Occurs

  7. NanoMas Technologies Inc | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer PlantMunhall, Pennsylvania: Energy ResourcesOcean EnergyEnergyNanceNanoMas Technologies Inc

  8. MAS 10.3 Seasonal Preparation 3/21/95 | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    MAS10-03.doc More Documents & Publications DOE-STD-1064-94 MAS 10.2 Control of Measuring and Test Equipment, 3995 OSS 19.5 Hazardous Waste Operations and Emergency...

  9. MAS Media Arts and Studies KEY: # = new course * = course changed = course dropped

    E-Print Network [OSTI]

    MacAdam, Keith

    MAS Media Arts and Studies KEY: # = new course * = course changed = course dropped University TO MEDIA AND CULTURE. (3) This course focuses on the study of electronic mass media. It surveys media, culture, and power. MAS 201 COMMUNICATION TECHNOLOGIES AND SOCIETY. (3

  10. Co-terminal: BS Civil Engineering + MAS Programs The BSCE+MAS co-terminal degree programs are designed for students to earn the Bachelor of Science in Civil Engineering

    E-Print Network [OSTI]

    Heller, Barbara

    Co-terminal: BS Civil Engineering + MAS Programs The BSCE+MAS co-terminal degree programs co-terminal degree programs in the CAEE Department. You may also contact the faculty advisor about each of these programs identified below. Co-terminal: BS Civil Engineering +MAS Construction

  11. MAS 10.2 Control of Measuring and Test Equipment, 3/9/95 | Department...

    Broader source: Energy.gov (indexed) [DOE]

    2 Control of Measuring and Test Equipment, 3995 MAS 10.2 Control of Measuring and Test Equipment, 3995 The objective of this surveillance is to verify that the contractor...

  12. Higher Order Amyloid Fibril Structure by MAS NMR and DNP Spectroscopy

    E-Print Network [OSTI]

    Debelouchina, Galia T.

    Protein magic angle spinning (MAS) NMR spectroscopy has generated structural models of several amyloid fibril systems, thus providing valuable information regarding the forces and interactions that confer the extraordinary ...

  13. DNP-Enhanced MAS NMR of Bovine Serum Albumin Sediments and Solutions

    E-Print Network [OSTI]

    Ravera, Enrico

    Protein sedimentation sans cryoprotection is a new approach to magic angle spinning (MAS) and dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) spectroscopy of proteins. It increases the sensitivity of ...

  14. Development of a generic, computerized nuclear material accountability system: NucMAS

    SciTech Connect (OSTI)

    Cornell, M.D.; O'Leary, J.M.

    1987-01-01T23:59:59.000Z

    The application NucMAS provides basic computerized accountability functions for the Savannah River Plant (SRP) Separations Department Material Balance Areas (MBA's). These functions include data entry, data management, calculations, and report generation. NucMAS can be used both for routine reporting to the SRP central Material Control and Accounting (MC and A) system and for rapid ad hoc queries in emergency situations. The system is designed to work with any process handling one or more of the 17 accountable nuclear materials specified by the Department of Energy (DOE). It relies on user-supplied configuration data to drive data prompts, report headings, data validations, and calculations.

  15. Non-asymptotic Adaptive Prediction in Functional Linear Models Elodie Brunel, Andre Mas, and Angelina Roche

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    Non-asymptotic Adaptive Prediction in Functional Linear Models Elodie Brunel, Andre Mas, and Angelina Roche I3M, Universite Montpellier II Abstract Functional linear regression has recently attracted. Functional linear regression, functional principal components analysis, mean squared prediction error

  16. MANAGEMENT OF DANGEROUS GOODS IN CONTAINER TERMINAL WITH MAS Mansoriya Hamidou*

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    MANAGEMENT OF DANGEROUS GOODS IN CONTAINER TERMINAL WITH MAS MODEL Mansoriya Hamidou* , Dominique the dangerous container storage problem. It is an optimization problem since the aim is to improve the container. Keywords: container terminal, dangerous container, multi-agents system, security 1. INTRODUCTION This paper

  17. Journes MAS 2010, Bordeaux Session : Modles de dgradation et politique de maintenance

    E-Print Network [OSTI]

    Boyer, Edmond

    for condition-based component replacement, Reliability Engineering and System Safety, 94: 752758, 2009. [2] JJournes MAS 2010, Bordeaux Session : Modles de dgradation et politique de maintenance Politique de maintenance adaptative pour un systme soumis une dgradation indirectement observable par Khac

  18. Acceptance Test Report for the Modular Automation System (MAS) Manufactured by Honeywell Inc.

    SciTech Connect (OSTI)

    ANDERSON, D.L.

    2000-02-01T23:59:59.000Z

    This document details the performance of the acceptance test of the Honeywell MAS Control System for equipment to be installed in gloveboxes HA-20MB and HA-211 at a later date. Equipment that was anticipated included 6 stabilization furnaces, only three and their associated equipment were installed.

  19. MMAE Co-terminal Degrees Summary Co-terminal Degrees within MMAE (MAS = master of engineering, i.e. non-thesis

    E-Print Network [OSTI]

    Heller, Barbara

    their knowledge in their major area of study (mechanical or aerospace engineering = master of engineering, i.e. non-thesis masters): BS Mechanical Engineering + MAS Mechanical and Aerospace Engineering BS Aerospace Engineering + MAS

  20. X-mas trees: A new application for duplex stainless steels

    SciTech Connect (OSTI)

    Hochoertler, G.; Zeiler, G.; Haberfellner, K.

    1995-12-31T23:59:59.000Z

    The development of fields in severe areas (subsea installations, deserts) necessitates the use of materials which can operate maintenance free in these conditions. Depending on production route and aggressivity of relevant media, the materials used until now, such as AISI 4130, are being superseded by higher alloyed materials such as F6NM, Duplex and Super Duplex Steels. Extensive investigation of metallurgical, mechanical, technological and stress aspects as well as research into the influence of melting, forging and heat treatment processes on high alloyed materials enables ``High Tech`` forgings to be manufactured. Based on investigations and experience gained by previously produced forgings (WYE-piece, Gate Valve components, Swivel forgings, line pipes made of Super Duplex Stainless Steels and Duplex Stainless Steels), the first X-mas trees made of solid Duplex Stainless Steel has been produced. Due to the excellent mechanical and corrosion properties of Duplex Stainless Steel, the expensive and time consuming cladding can be eliminated for most environments, which results in good economy and significantly reduced production time. To obtain information about the quality of such a large forging, samples were taken from one of these X-mas trees and the mechanical and corrosion properties were investigated.

  1. A comparison of cloud top heights computed from airborne lidar and MAS radiance data using CO2 slicing

    E-Print Network [OSTI]

    Sheridan, Jennifer

    A comparison of cloud top heights computed from airborne lidar and MAS radiance data using CO2 in assessing the accuracy of the CO2-slicing cloud height algorithm. Infrared measurements of upwelling which included various single- layer and multilayer cloud conditions. Overall, the CO2-slicing method

  2. MAS 02 A Communications Framework for the Cost-effective Operation of Slocum Gliders in Coastal Regions

    E-Print Network [OSTI]

    California at Los Angeles, University of

    MAS 02 A Communications Framework for the Cost-effective Operation of Slocum Gliders in Coastal in significant savings in terms of man-power as well as a very economical way of increasing the coverage area turns out to be the communication cost over Iridium which makes up a large portion of the nominal

  3. LyMAS: Predicting Large-Scale Lyman-alpha Forest Statistics from the Dark Matter Density Field

    E-Print Network [OSTI]

    Peirani, Sbastien; Colombi, Stphane; Blaizot, Jrmy; Dubois, Yohan; Pichon, Christophe

    2013-01-01T23:59:59.000Z

    [abridged] We describe LyMAS (Ly-alpha Mass Association Scheme), a method of predicting clustering statistics in the Ly-alpha forest on large scales from moderate resolution simulations of the dark matter distribution, with calibration from high-resolution hydrodynamic simulations of smaller volumes. We use the "Horizon MareNostrum" simulation, a 50 Mpc/h comoving volume evolved with the adaptive mesh hydrodynamic code RAMSES, to compute the conditional probability distribution P(F_s|delta_s) of the transmitted flux F_s, smoothed (1-dimensionally) over the spectral resolution scale, on the dark matter density contrast delta_s, smoothed (3-dimensionally) over a similar scale. In this study we adopt the spectral resolution of the SDSS-III BOSS at z=2.5, and we find optimal results for a dark matter smoothing length sigma=0.3 Mpc/h (comoving). In extended form, LyMAS exactly reproduces both the 1-dimensional power spectrum and 1-point flux distribution of the hydro simulation spectra. Applied to the MareNostrum ...

  4. ARM - Campaign Instrument - mas

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492air Comments? We would love to hear from you! SendgovInstrumentslmwrr-air Comments? We would love

  5. Robotic Helicopter Surveying (MAS 13)

    E-Print Network [OSTI]

    Srikanth Saripalli; Jonathan Kelly; Gaurav S. Sukhatme

    2006-01-01T23:59:59.000Z

    for Embedded Networked Sensing Robotic Helicopter Surveyingand Gaurav S. Sukhatme Robotic Embedded Systems Laboratory,

  6. I: Low Frequency NMR and NQR Using a dc SQUID. II: Variable-temperature 13C CP/MAS of Organometallics

    SciTech Connect (OSTI)

    Ziegeweid, M.A.

    1995-11-29T23:59:59.000Z

    NMR and NQR at low frequencies are difficult prospects due to small nuclear spin polarization. Furthermore, the sensitivity'of the inductive pickup circuitry of standard spectrometers is reduced as the frequency is lowered. I have used a cw-SQUID (Superconducting QUantum Interference Device) spectrometer, which has no such frequency dependence, to study the local atomic environment of {sup 14}N via the quadrupolar interaction. Because {sup 14}N has spin I = 1 and a 0-6 MHz frequency range, it is not possible to obtain well-resolved spectra in high magnetic fields. I have used a technique to observe {sup 14}N NQR resonances via their effect on neighboring protons mediated by the heteronuclear dipolar interaction to study peptides and narcotics. The sensitivity of the SQUID is not enough to measure low-frequency surface (or other low spin density) systems. The application of spin-polarized xenon has been previously used to enhance polarization in conventional NMR experiments. Because xenon only polarizes spins with which it is in contact, it is surface selective. While differences in chemical shifts between surface and bulk spins are not large, it is expected that the differences in quadrupole coupling constant should be very large due to the drastic change of the electric field gradient surrounding spins at the surface. With this in mind, I have taken preliminary steps to measure SQUID detected polarization transfer from Xe to another spin species at 4.2 K and in small magnetic fields (<50 G). In this regime, the spin-lattice relaxation of xenon is dependent on the applied magnetic field. The results of our efforts to characterize the relaxation of xenon are presented. The final section describes the solid-state variable-temperature (VT) one- and two-dimensional {sup 13}C cross polarization (CP)/magic angle spinning (MAS) NMR of Hf({eta}{sup 5}-C{sub 5}H{sub 5}){sub 2}({eta}{sup 1}-C{sub 5}H{sub 5}){sub 2}, Zr({eta}{sup 5}-C{sub 5}H{sub 5}){sub 3}({eta}{sup 1}-C{sub 5}H{sub 5}) and Sn({eta}{sup 1}-C{sub 5}H{sub 5}){sub 4}. This work was undertaken in the hope of gaining insight into the intramolecuhrr dynamics, specifically which fluxional processes exist in the solid state, by what mechanism rearrangements are occurring, and the activation energies by which these processes are governed.

  7. {sup 1}H and {sup 23}Na MAS NMR spectroscopy of cationic species in CO{sub 2} selective alkaline earth metal porous silicoaluminophosphates prepared via liquid and solid state ion exchange

    SciTech Connect (OSTI)

    Arevalo-Hidalgo, Ana G. [Department of Chemical Engineering, University of Puerto Rico-Mayagueez Campus, Mayagueez, PR 00681-9000 (Puerto Rico); Dugar, Sneha; Fu, Riqiang [National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310 (United States); Hernandez-Maldonado, Arturo J., E-mail: arturoj.hernandez@upr.edu [Department of Chemical Engineering, University of Puerto Rico-Mayagueez Campus, Mayagueez, PR 00681-9000 (Puerto Rico)

    2012-07-15T23:59:59.000Z

    The location of extraframework cations in Sr{sup 2+} and Ba{sup 2+} ion-exchanged SAPO-34 was estimated by means of {sup 1}H and {sup 23}Na MAS NMR spectroscopy and spectral deconvolution. Incorporation of the alkaline earth metal cations onto the SAPO framework was achieved via liquid state ion exchange, coupled partial detemplation/solid-state ion exchange, and combination of both techniques. MAS NMR revealed that the level of ion exchange was limited by the presence of protons and sodium cations near hexagonal prisms (site SI), which are relatively difficult to exchange with the alkaline earth metal due to steric and charge repulsion criteria. In addition, the presence of ammonium cations in the supercages facilitated the exchange of otherwise tenacious hydrogen as corroborated by unit cell compositional data as well as enhanced CO{sub 2} adsorption at low partial pressures. The extraframework ammonium species were produced from partial detemplation of the structure-directing agent employed for the SAPO-34 synthesis, tetraethylammonium. - Graphical abstract: MAS NMR was used to elucidate the position the cationic species in alkaline earth metal exchanged silicoaluminophosphates. These species played a significant role during the ion exchange process and, therefore, the materials ultimate CO{sub 2} adsorption performance. Highlights: Black-Right-Pointing-Pointer Location of extraframework Sr{sup 2+} or Ba{sup 2+} cations was estimated by means of {sup 1}H and {sup 23}Na MAS NMR. Black-Right-Pointing-Pointer Level of Sr{sup 2+} or Ba{sup 2+} ion exchange was limited by the presence of protons and sodium cations. Black-Right-Pointing-Pointer Presence of ammonium cations in the supercages facilitated the exchange. Black-Right-Pointing-Pointer Sr{sup 2+} and Ba{sup 2+} ion exchanged SAPOs are outstanding CO{sub 2} adsorbents.

  8. Journes MAS 2010, Bordeaux Algorithmes Stochastiques

    E-Print Network [OSTI]

    Boyer, Edmond

    MCO, MCOP, MCOG, ... seront mises en évidence. Adresse : Abderrahmen Touati Ecole Supérieure de la

  9. Journes MAS 2010, Bordeaux Session : Algorithmes Stochastiques

    E-Print Network [OSTI]

    Boyer, Edmond

    . En particulier plusieurs facettes et applications des algorithmes MCO, MCOP, MCOG, ... seront mises

  10. Journes MAS 2010, Bordeaux Session : Algorithmes Stochastiques

    E-Print Network [OSTI]

    Boyer, Edmond

    Carlo adaptatives par Jrome Lelong Adaptive Monte Carlo methods are powerful variance reduction a randomly truncated stochastic algorithm. Finally, we apply this technique to the valuation of nancial deri

  11. MAS.963 Ambient Intelligence, Spring 2004

    E-Print Network [OSTI]

    Maes, Patricia

    This course focuses on Ambient Intelligence, and how it envisions a world where people are surrounded by intelligent and intuitive interfaces embedded in the everyday objects around them. These interfaces recognize and ...

  12. MAS.630 Affective Computing, Spring 2002

    E-Print Network [OSTI]

    Picard, Rosalind

    Explores computing that relates to, arises from, or deliberately influences emotion. Topics include the interaction of emotion with cognition and perception, the role of emotion in human-computer interaction, the communication ...

  13. Scheduling on the MasPar SIMD parallel computer

    E-Print Network [OSTI]

    Perkins, Keith Douglas

    1995-01-01T23:59:59.000Z

    , or 10 (b) have finished communicating with the task. 3. The processor must not be currently executing a task. The schedule for this task graph is shown in Figure 3. This schedule shows two processors, PO and Pl, and the units of time, T. In Figure 2... queue and the precedence constraints, Figure 5 shows the time, T, when each task is scheduled onto processors PO and Pl. 13 14 12 13 10 6 7 9 5 Fig. 4. A task graph labeled by using the Coffman/Graham algorithm. P1 13 ? ? 9 7 5 3 1 P0 14 12 11...

  14. Surveillance Guide - MAS 10.1 Implementation of the Integrated...

    Broader source: Energy.gov (indexed) [DOE]

    O 4330.4B Chapter II section 9, 10 CFR 830.120 (B) (4) Yes No NA 14. Is measuring and test equipment used for maintenance within current calibration? DOE O...

  15. www.mas.ecp.fr Director: Frdric Abergel

    E-Print Network [OSTI]

    Bezerianos, Anastasia

    A digipl AnTe projeCT Te Am) Modelling and estimation of the dynamic system of plants in their environment restoration with numerical models iNDusTRial paRTNeRs BNP Paribas, SAP-BusinessObjects, Alcatel, Bionatics, simulation, analysis, optimization and visualization of complex systems, whether they come from

  16. Scheduling on the MasPar SIMD parallel computer

    E-Print Network [OSTI]

    Perkins, Keith Douglas

    1995-01-01T23:59:59.000Z

    scheduling, parallel and distributed operating systems, and memory manage- ment [5, 7, 14]. Overall, parallel systems have improved since their inception. Many special cases have been identified, and some gcncral case heuristics have been built that apply... be allocated and freed dynamically, edge costs cannot be completely calculated prior to task 11 3 3 3 3 3 3 3 3 5 8 5 3 0 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 4 4 4 5 6 7 T 1 2 3 4 5 6 7 8 9 10 11 12 13 14 'l5 13 17 18 19 20 21 22 23 Fig. 3. The ffnal schedule...

  17. MAS 108 Probability I Test 11 November 2005, 16101655

    E-Print Network [OSTI]

    Bailey, R. A.

    ) For which values of p are they more likely to have 2 boys than 3 boys? 3 #12;4 (15 marks) A fish is caught at random on the Great Barrier Reef. The probability that the fish is striped is 7/20; the probability that the fish is luminous is 1/5; and the probability that the fish is both striped and luminuous is 1/20. Find

  18. auxiliary sources mas: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Method CERN Preprints Summary: Investigations are made on the saddle point calculations (SPC) under the auxiliary field method in path integrations. Two different ways of SPC are...

  19. QUEEN MARY, UNIVERSITY OF LONDON MAS 314 Design of Experiments

    E-Print Network [OSTI]

    Bailey, R. A.

    the Hasse diagram to work out what GenStat syntax to use. 1 (A Graeco-Latin square) Four bottle-making machines were used for four days to test two treatment factors--mixture of ingredients for the glass bottle.dat, using the same order conventions as in wear.dat and apple.dat, with machines as rows and days

  20. Stereo Vision Aided Navigation for Robotic Boats (MAS 10)

    E-Print Network [OSTI]

    2006-01-01T23:59:59.000Z

    A docking system for a robotic boat using stereo vision foraided Navigation for Robotic Boats Arvind Menezes Pereira,Moorthi and David Caron. Robotic Embedded Systems Lab,

  1. MAS 552.J / 4.557J MIT Living Labs

    E-Print Network [OSTI]

    innovations that including new lightweight electric vehicles, electric charging and smart grid technologies) the CityHome. MoD systems consist of a fleet of Lightweight Electric Vehicles (LEVs) distributed that tackle the "First and Last Mile" problem of public transit systems. The CityCar designed by the Changing

  2. Variations du nombre de grains chez diffrents gnotypes de mas

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    dates of sowing, use of plastic mulch). Row number was not modified by environmental condi- tions, prsence ou non de mulch plastique (au total 22 conditions diffrentes). Pour un gnotype donn, le nombre en zone sep- tentrionale, diffrentes dates et avec, dans certains cas, un mulch plastique destin

  3. QUEEN MARY, UNIVERSITY OF LONDON MAS 314 Design of Experiments

    E-Print Network [OSTI]

    Bailey, R. A.

    in the construction of underwater structures at sea, such as piers and oil-drilling platforms. He wants to protect the engineer how best to use his resources in his experiment. 1 #12;3 (Question 3 from Assignment 4 on the output. 4 (Question 5 from Practical 8) Groups of apples were stored in a shed in a 4 ? 4 Latin square

  4. QUEEN MARY, UNIVERSITY OF LONDON MAS 314 Design of Experiments

    E-Print Network [OSTI]

    Bailey, R. A.

    in the construction of underwater structures at sea, such as piers and oil-drilling platforms. He wants to protect the engineer how best to use his resources in his experiment. 2 Look at the Genstat output for Question 7 of Practical 3. Explain what Genstat is doing when the Treatment Structure is control/tmt. What hypothesis

  5. aquilo mas eu: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    alkaline fusion process is used from waste phosphors. 1. Introduction The recycling of rare earths is of importance for helping for recycling Eu from BaMgAl10O17:Eu2+ (BMA)...

  6. MAS276 Rings and Groups Feedback on exam 2010-11

    E-Print Network [OSTI]

    Cheng, Eugenia

    + instead of -. Many people did not point out that the norm test is again completely conclusive, ie, and then checked each condition. iii) Most people had the right idea but many people then got confused about the ring is not a UFD". iv) Far too many people said yes, with spurious "reasons" such as "it's a subring

  7. Slow-MAS NMR: A New Technology for In Vivo Metabolomic Studies...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    in vivo 1H NMR metabolite spectra, as illustrated by measurements in the liver and heart of a live mouse. Thus, LOCMAT promises to significantly enhance the utility of NMR...

  8. loannis Tomkos, Dimitrios Vogiatzis, Carmen Mas, loannis Zacharopoulos, Anna Tzanakaki, and Emmanovel Varvarigos

    E-Print Network [OSTI]

    Varvarigo, Emmanouel "Manos"

    of technology and architectures toward a more flexible and intelligent optical network layer based on the use introduced by the transmission line or switching equipment. Network designers may overcome the impact engineering of transparent metropolitan area optical networks. Our results show the relationship between

  9. Looking for an Exit: Variations on M&As and IPOs Moderator: Timothy J. Keating

    E-Print Network [OSTI]

    Public Offerings 3 · Partner, Investment Banking · Head of Greentech/Alternative Energy Investment, University of Illinois, 1987 · MBA, J.L. Kellogg School of Management, Northwestern University, 1992 Shez Compliance Requirements (Sarbanes-Oxley, Audit, Governance) # of Responses Answered as a Top 3 Issue

  10. Memoria 2011 Biblioteca y Archivo Universidad Autnoma de Madrid Cartoteca "Rafael Mas"

    E-Print Network [OSTI]

    Autonoma de Madrid, Universidad

    pormenorizados en el Inventario de los Materiales Cartográficos ­ 2011, disponible en la web: (http://biblioteca.uam.es/cartoteca/documentos/inventario

  11. QUALIT DES ENSILAGES DE MAS GRAIN HUMIDE PRSERVS PAR L'ACIDE PROPIONIQUE

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    product) and acetic (0,1-0,3 per cent) acids are produced by carbohydrate fermentation. The silage p mas grain humide, la fermentation des glucides entrane une pro- duction notable d'acides lactique (0 degradative change is practically inhi- bited after 3 to 8 months : in our assays, lactic and acetic acids

  12. MAS.714J / STS.445J Technologies for Creative Learning, Fall 2004

    E-Print Network [OSTI]

    Resnick, Mitchel

    This course explores how new technologies can help people learn new things in new ways. It analyzes principles and strategies underlying the design of innovative educational technologies and creative learning environments, ...

  13. SCHOOL OF MATHEMATICS AND STATISTICS Spring Semester MAS273 Statistical Modelling 2 hours

    E-Print Network [OSTI]

    .0340 Water -37.36 1.83 -20.37 Residual standard error: 31.5 on 25 degrees of freedom Multiple R by weight, Water (W) - % moisture by weight. n heaps of municipal waste were obtained and the regression of 2 ? (1 mark) (iii) What is the value of the residual sum of squares for the model? (2 marks) (iv

  14. Surveillance Guide - MAS 10.2 Control of Measuring and Test Equipment

    Broader source: Energy.gov (indexed) [DOE]

    CONTROL OF MEASURING AND TEST EQUIPMENT 1.0 Objective The objective of this surveillance is to verify that the contractor maintains adequate control of tools, gauges, instruments,...

  15. 6.868J / MAS.731J The Society of Mind, Spring 2007

    E-Print Network [OSTI]

    Minsky, Marvin

    This course is an introduction to a theory that tries to explain how minds are made from collections of simpler processes. The subject treats such aspects of thinking as vision, language, learning, reasoning, memory, ...

  16. Gii thiu v trng UMass Amherst l trng ni ting trong h thng i Hc Mas-

    E-Print Network [OSTI]

    Mountziaris, T. J.

    khoa hc k thut polime c xp hng trong cc ngnh hc hng u ton quc trong s cc trng i hc cng lp hay i

  17. A mi familia, que son lo que mas quiero en el mundo Agradecimientos

    E-Print Network [OSTI]

    Bonomo, Flavia

    ´itmica . . . . . . . . . . . . . . . . . . . . . 10 1.4 Programaci´on lineal y teor´ia poliedral . . . . . . . . . . . . . 13 1.5 Clases de matrices

  18. MAS.160 Signals, Systems, and Information for Media Technology, Fall 2001

    E-Print Network [OSTI]

    Massachusetts Institute of Technology. Media Laboratory.

    Fundamentals of signals, systems, and information theory with emphasis on modeling both the audio/visual message and the human recipient. Linear systems, difference equations, Z-transforms, sampling and sampling rate ...

  19. The refocused INADEQUATE MAS NMR experiment in multiple spin-systems: Interpreting observed correlation

    E-Print Network [OSTI]

    Baltisberger, Jay H.

    de Chimie (UMR 5182 CNRS/ENS Lyon), E´ cole Normale Supe´rieure de Lyon, 46 alle´e d'Italie, 69364

  20. Perturbations dans la reproduction de la pyrale du mas, Ostrinia nubilalis Hb. (Lpidoptre Pyra-

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    Hb. are incaged with rubber septa dispensers impregnated with the synthetic sex pheromone Z:E-97 disruption, Climatic conditions, Oviposition, Mating frequency, Synthetic pheromone, Pheromone release

  1. Problem Set 3 MAS 622J/1.126J: Pattern Recognition and Analysis

    E-Print Network [OSTI]

    samples from class 1 x1 = dd(:,1); % test samples from class 2 x2 = dd(:,2); Pd_save = []; Pf_save(x > x_c | x in w=1) Pf = nFP / num_samples; Pd_save = [Pd_save; Pd]; Pf_save = [Pf_save; Pf]; end mean1 - mean2)/sig % d' figure hold on plot(Pf_save, Pd_save, 'r') 2 #12;sprintf('dataset2:') dd = load

  2. NuMas: A LAN-based materials control and accounting system in production

    SciTech Connect (OSTI)

    Strickland, T.W.; Bracey, J.T.; McMahon, S.A. [Lockheed Martin Utility Services, Inc., Paducah, KY (United States). Paducah Gaseous Diffusion Plant

    1995-12-31T23:59:59.000Z

    A state-of-the-art Nuclear Materials Control and Accounting (NMC and A) System has been implemented and is fully operational at the Paducah Gaseous Diffusion Plant (PGDP) as of September 1994. The uranium enrichment facility is currently regulated by the Department of Energy (DOE) and is in the process of obtaining Nuclear Regulatory Commission (NRC) certification. Implementation of this system has resulted in a tremendous cost savings to the facility as well as improvements to the overall efficiency of the NMC and A department. This paper outlines the benefits of implementing a Personal Computer/Local Area Network (PC/LAN)-based system in hopes of attracting other facilities to explore and utilize its application at their sites.

  3. Dure des phases vgtative et reproductrice chez le mas. Influence du gnotype et du milieu

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    with or without plastic mulch).' Soil ' temperature was more representative than 'air temperature ' to explain, dates of sowing, plastic mulch. I. INTRODUCTION Le cycle du mas est constitu d'une succession de annes, semis dcals, sol couvert ou non de mulch plastique. La vitesse de dveloppement jusqu' l

  4. High field DNP and cryogenic MAS NMR : novel instrumentation and applications

    E-Print Network [OSTI]

    Markhasin, Evgeny

    2014-01-01T23:59:59.000Z

    Solid State Nuclear Magnetic Resonance (ssNMR) spectroscopy has blossomed over the last two decades. As ssNMR is progressively applied to more challenging systems, the sensitivity remains one of its major limiting factors. ...

  5. Text Simplification in Simplext: Making Texts more Accessible Simplificacion de textos en Simplext: haciendo textos mas accesibles

    E-Print Network [OSTI]

    Escolano, Francisco

    aticos, lbourg@asi-soft.com Resumen: El proyecto Simplext propone el desarrollo de un sistema ubicuo para la an ubiquitous text simplifica- tion system for Spanish. The automatic simplification system is being developed-020302-2010-84). plext project. 2 Simplification Methodology Manual simplification methodology in Sim

  6. Quantitative metabolic profiles of 2nd and 3rd trimester human amniotic fluid using 1H HR-MAS spectroscopy

    E-Print Network [OSTI]

    2009-01-01T23:59:59.000Z

    of 4.75 ppm (including residual water) and up?eld of ?1 ppmdetection resulting in a residual water signal [29], whereasD (2008) Improved residual water suppression: WET180. J

  7. Efficient resonance assignment of proteins in MAS NMR by simultaneous intra- and inter-residue 3D correlation spectroscopy

    E-Print Network [OSTI]

    Daviso, Eugenio

    Resonance assignment is the first step in NMR structure determination. For magic angle spinning NMR, this is typically achieved with a set of heteronuclear correlation experiments (NCaCX, NCOCX, CONCa) that utilize SPECIFIC-CP ...

  8. MAS02ACommunica4onsFrameworkfortheCosteffec4veOpera4onof SlocumGlidersinCoastalRegions

    E-Print Network [OSTI]

    California at Los Angeles, University of

    :onmodels such asJPL'sROMSmodel.Eventhoughtheglidersareveryefficientin their use of power, the nominal cost of opera,whichwillenableustogetdatabackfromgliders(andprobablyotherdatacollec:onpla]ormssuch as boats, and buoys), in a costeffec:ve and quick manner. This infrastructure requires minor hardware:on :mes,at the expense of speed and maneuverability. Power consump:on minimiza

  9. A Marine Science and Technology (MAST-III) research project Contract N. MAS3-CT97-0142

    E-Print Network [OSTI]

    Ds, Kristofer

    observations and models. The diagram outlines the interconnection of subpolar, subtropical and intertropical (in blue). In addition to the good agreement between values, TRACMASS computations allow us

  10. 17O and 27Al MAS and 3QMAS NMR Study of Synthetic and Natural Layer Silicates

    E-Print Network [OSTI]

    Puglisi, Joseph

    of ground- water and the adsorption and transport of nuclear waste and heavy metals.1-3 Many layer silicates and metal adsorbates. Such detailed structural information is difficult to obtain from con- ventional X

  11. Valen Mas Que Mil Palabras: Las Etiquetas de Advertencia Pictoricas de Tabaco y Los Derechos Linguisticos de EEUU

    E-Print Network [OSTI]

    Jaron Browne; Susana Hennessey-Lavery; Kim Rogers

    2007-01-01T23:59:59.000Z

    4 Los idiomas y la alfabetizacin eningls o con niveles de alfabetizacin limi- tada. Laslings- ticos y de alfabetizacin. El hecho de que estas

  12. Valen Mas Que Mil Palabras: Las Etiquetas de Advertencia Pictoricas de Tabaco y Los Derechos Linguisticos de EEUU

    E-Print Network [OSTI]

    Jaron Browne; Susana Hennessey-Lavery; Kim Rogers

    2007-01-01T23:59:59.000Z

    dainos del consumo de produc- tos tabacaleros, las demandaspblica sobre los efec- tos nocivos del consumo de tabaco esimportantes en los conocimien- tos cientficos sobre las

  13. FTIR and 27 Al MAS NMR analysis of the effect of framework Al-and Si-defects

    E-Print Network [OSTI]

    Sklenak, Stepan

    requirements for produc- tion of polymers are continuously growing and diesel fuel is com- ing more into demand

  14. The transition from water to land is one of the most fascinating enig-mas of evolution. In particular, the evolution of limbs from ances-

    E-Print Network [OSTI]

    Halazonetis, Thanos

    . In particular, the evolution of limbs from ances- tral fish fins remains a mystery. Both fish and land animals similar 3-dimensional DNA or- ganization of the fish and mouse clusters, which indicates that the main mechanism used to pattern tetrapod limbs was already pres- ent in fish. However, when inserted

  15. Department of Mathematics & Statistics Tutor List FILE: Tutor List_MathHelp Centre/Tutor List_July 10, 2013 Last updated July 10, 2013_mas905

    E-Print Network [OSTI]

    Saskatchewan, University of

    . Kevin Krieger kjk193@mail.usask.ca Math 110/116/123 & 124 Khalid Amin kba561@mail.usask.ca / 2624489

  16. MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO4/FePO4 System

    E-Print Network [OSTI]

    Cabana, Jordi

    2010-01-01T23:59:59.000Z

    compared to the lithium-electron interaction in x Li FeP04 (by Fermi contact interactions between the lithium ions andlithium ions in LiFePC^ suggests a modification of the Fe -O-P interaction.

  17. High-resolution MAS NMR analysis of PI3-SH3 amyloid fibrils: Backbone conformation and implications for protofilament assembly and structure

    E-Print Network [OSTI]

    Bayro, Marvin J.

    The SH3 domain of the PI3 kinase (PI3-SH3 or PI3K-SH3) readily aggregates into fibrils in vitro and has served as an important model system in the investigation of the molecular properties and mechanism of formation of ...

  18. Mujer Mas Segura (Safer Women): A combination prevention intervention to reduce sexual and injection risks among female sex workers who inject drugs

    E-Print Network [OSTI]

    2012-01-01T23:59:59.000Z

    among FSW-IDUs. The factorial design will permit analysis toconditions in a 22 factorial design as described below (seeFigure 1). We chose a factorial design since it enables

  19. Design, analysis, and testing of a precision guidance, navigation, and control system for a dual-spinning Cubesat

    E-Print Network [OSTI]

    Wise, Evan Dale

    2013-01-01T23:59:59.000Z

    The Microsized Microwave Atmospheric Satellite (MicroMAS) combines two traditional control approaches: a dual spinner and a three-axis gyrostat. Unlike typical dual spinners, the purpose of MicroMAS 's 2U bus and spinner ...

  20. 750 MHz NMR Rainier (Liquids) | EMSL

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    for the two diastereomers of the vitamin K epoxide reductase (VKOR)... Magnesium Silicate Dissolution Investigated by 29Si MAS, 1H-29Si CP MAS, 25Mg QCPMG, and 1H-25Mg CP...

  1. adnexal malt lymphoma: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    MAS5 Affymetrix Microarray Suite 5 xx... Hamoudi, Rifat A 2010-01-01 2 ??? ??? Helicobacter pylori ?? MALT ??? ??? ??? ??? ???...

  2. Estimados de diversidad de rboles del Bosque Seco de

    E-Print Network [OSTI]

    Gilbes, Fernando

    elementos por conocer? ¿Dónde es mas probable encontrarlos? #12;Técnicas tradicionales · Inventario de

  3. Jovens trocam cursos por busca

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    trajetos esco- lares", conta. "Mas isso numa si- tuao normal que no a que es- tamos a atravessar

  4. A Changing Planet Over the past century, the average global tempera-

    E-Print Network [OSTI]

    tons of hydrogen fuse into helium within the sun's core as part of a mas- sive chain of thermonuclear

  5. Gravity Probe B: Final Results of a Space Experiment to Test General Relativity

    E-Print Network [OSTI]

    C. W. F. Everitt; D. B. DeBra; B. W. Parkinson; J. P. Turneaure; J. W. Conklin; M. I. Heifetz; G. M. Keiser; A. S. Silbergleit; T. Holmes; J. Kolodziejczak; M. Al-Meshari; J. C. Mester; B. Muhlfelder; V. Solomonik; K. Stahl; P. Worden; W. Bencze; S. Buchman; B. Clarke; A. Al-Jadaan; H. Al-Jibreen; J. Li; J. A. Lipa; J. M. Lockhart; B. Al-Suwaidan; M. Taber; S. Wang

    2011-05-17T23:59:59.000Z

    Gravity Probe B, launched 20 April 2004, is a space experiment testing two fundamental predictions of Einstein's theory of General Relativity (GR), the geodetic and frame-dragging effects, by means of cryogenic gyroscopes in Earth orbit. Data collection started 28 August 2004 and ended 14 August 2005. Analysis of the data from all four gyroscopes results in a geodetic drift rate of -6,601.8+/- 18.3 mas/yr and a frame-dragging drift rate of -37.2 +/- 7.2 mas/yr, to be compared with the GR predictions of -6,606.1 mas/yr and -39.2 mas/yr, respectively (`mas' is milliarc-second; 1mas = 4.848 x 10-9 rad).

  6. Mapa GlobCover 2009. European Space Agency (ESA). www.esa.int Ciudad Universitaria de Cantoblanco 28049 Madrid

    E-Print Network [OSTI]

    Autonoma de Madrid, Universidad

    .uam.es/cartoteca/default.html Cartoteca "Rafael Mas" INVENTARIO DE LOS MATERIALES CARTOGRÁFICOS 2010 #12;UAM. Cartoteca "Rafael Mas". Inventario, 2010 2 La CARTOTECA RAFAEL MAS es una biblioteca especializada en cuanto a las características". Inventario, 2010 3 El Boletín Meteorológico Diario, editado por el Instituto Nacional de Meteorología, fue

  7. DRAFT

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    REPORT NUCLEAR WORKFORCE SUMMIT Sponsored by the Savannah River Site Community Reuse Organization (SRSCRO) Prepared By: MAS Consultants, Inc. June 29, 2009 SRSCRO Nuclear Workforce...

  8. A study of the image formation model and noise characterization in SPECT imaging.

    E-Print Network [OSTI]

    proporcional al flujo sanguineo cerebral local al momento de su administracion. La tecnica mas utilizada

  9. Does the Effect of Pollution on Infant Mortality Differ Between Developing and Developed Countries? Evidence from Mexico City

    E-Print Network [OSTI]

    Arceo, Eva; Hanna, Rema; Oliva, Paulina

    2012-01-01T23:59:59.000Z

    could affect both pollution levels and infant mortality. Therelationship between pollution (! !" ) in a municipality (m)as very suggestive. pollution may be richer, and thus have

  10. -.A Science Service $&tux% Released upon receipt

    E-Print Network [OSTI]

    colonies. sagacious citizen that he did not discover hie secret tohile Napoleon mas s t q g l i n g in his

  11. AS TEORIAS RIVAIS SOBRE A PROPRIEDADE INTELECTUAL NO BRASIL

    E-Print Network [OSTI]

    Timm, Luciano Benetti; Caovilla, Renato

    2009-01-01T23:59:59.000Z

    ao comrcio. Mas o governo central no queria perder onacional. Entretanto, o governo coreano investiu nossocialista fez com que o governo russo emitisse uma pliade

  12. Ocrebrouma mquinadeTuring

    E-Print Network [OSTI]

    Menczer, Filippo

    da má quina a imitar Tudo isto poderá parecer despro vido de interesse prático mas nada está mais

  13. 224 College of Fine, Performing, and Communication Arts Office: 1321 Old Main; 313-577-1795; e-mail: music@wayne.edu

    E-Print Network [OSTI]

    Cinabro, David

    and viola), Steven Mas- trogiacomo (piano), Eldonna May (history), Lisa Meyer (music education), Clifford), James Van Valkenburg (viola, DSO), Brian Ventura (oboe, DSO), Stanley Waldon (piano), Robert Williams

  14. The City Effect: Urban Institutions, Peripheries and Political Participations in Bolivia

    E-Print Network [OSTI]

    Cielo, Maria Cristina Malong

    2010-01-01T23:59:59.000Z

    Judiciary Institute of Bolivia. Albro, Robert. 2005. TheAlem, Robert. 2007. Nunca Mas [documentary]. Bolivia: BandaBrava Bolivia/Buena Onda Films. Alexander, Robert. 2005. A

  15. The University of Texas at Austin -College of Liberal Arts Ethnic Studies (Mexican American Studies) Degree Plan

    E-Print Network [OSTI]

    Texas at Austin, University of

    /Bicultural* _________ *ANY upper-division Spanish course may be substituted for MAS 350 3 hours chosen from MAS 361 Cultural Minor: This major does not require a minor Minor Electives: A maximum of 16 hours may be taken on a pass

  16. Centrum voor Wiskunde en Informatica REPORTRAPPORT

    E-Print Network [OSTI]

    Vuik, Kees

    process ocurring during the heat treatment of as-cast aluminium alloys prior to hot extrusion of Particles in Multi-Component Alloys F.J. Vermolen, C. Vuik Modelling, Analysis and Simulation (MAS) MAS in Multi-Component Alloys Fred Vermolen CWI P.O.Box 94079, 1090 GB Amsterdam, The Netherlands Kees Vuik

  17. PROCEEDINGS, Thirty-Fourth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, February 9-11, 2009

    E-Print Network [OSTI]

    Stanford University

    GEOTHERMAL MANIFESTATION, DOMUYO VN., NEUQUN, ARGENTINA G. Mas1, 2 , L. Bengochea1, 2 , L. C. Mas3 & N is located in the northern of the Neuquen Province, 3663'S and 7042'W, in the Mines and Chos Malal

  18. Seminar Title: Current Seismology and Related Urban Safety Engineering Researches in Mongolia

    E-Print Network [OSTI]

    Tokyo, University of

    Seminar Title: Current Seismology and Related Urban Safety Engineering Researches in Mongolia ICUS: Introduction to RCAG and development of seismology in Mongolia MAS (RCAG) #12; 15:15-15:45 3. Dr. ULZIIBAT of Sciences Presentation Title: Recent seismic activity around Ulaanbaatar area, the capital of Mongolia) MAS

  19. Solid-State NMR Study of Intercalated Species in Poly( -caprolactone)/Clay Nanocomposites

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    Solid-State NMR Study of Intercalated Species in Poly( - caprolactone)/Clay Nanocomposites J of surfactant and polymer chains in intercalated poly( - caprolactone)/clay nanocomposites are characterized by 31 P magic-angle spinning (MAS) and 13 C cross-polarization MAS NMR techniques. To obtain hybrid

  20. Size dependence of magnetization switching and its dispersion of Co/Pt nanodots under the assistance of radio frequency fields

    SciTech Connect (OSTI)

    Furuta, Masaki, E-mail: furutam@mail.tagen.tohoku.ac.jp; Okamoto, Satoshi; Kikuchi, Nobuaki; Kitakami, Osamu [Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Shimatsu, Takehito [Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578 (Japan); Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577 (Japan)

    2014-04-07T23:59:59.000Z

    We have studied the dot size dependence of microwave assisted magnetization switching (MAS) on perpendicular magnetic Co/Pt multilayer dot array. The significant microwave assistance effect has been observed over the entire dot size D ranging from 50?nm to 330?nm examined in the present study. The MAS behavior, however, critically depends on D. The excitation frequency dependence of the switching field is well consistent with the spin wave theory, indicating that the magnetization precession in MAS is in accordance with the well defined eigenmodes depending on the dot diameter. The lowest order spin wave is only excited for D???100?nm, and then the MAS effect is well consistent with that of the single macrospin prediction. On the other hand, higher order spin waves are excited for D?>?100?nm, giving rise to the significant enhancement of the MAS effect. The dispersion of MAS effect also depends on D and is significantly reduced for the region of D?>?100?nm. This significant reduction of the dispersion is attributed to the essential feature of the MAS effect which is insensitive to the local fluctuation of anisotropy field, such as defect, damaged layer, and so on.

  1. Investigation of Mechanical Activation on Li-N-H Systems Using...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    resolution in the 6Li MAS NMR spectra of Li-N-H systems at ultra-high field of 21.1 tesla is exploited, for the first time, to study the detailed electronic and chemical...

  2. Population Structure, Association Mapping of Economic Traits and Landscape Genomics of East Texas Loblolly Pine ( Pinus taeda L.)

    E-Print Network [OSTI]

    Chhatre, Vikram E.

    2013-05-07T23:59:59.000Z

    Improvement Program (WGFTIP) hosted by the Texas A&M Forest Service. Rapid advances in genomics and molecular marker technology have created potential for application of Marker Assisted Selection (MAS) and Genomic Selection (GS) for accelerated breeding...

  3. PROGRESS IN BEAM FOCUSING AND COMPRESSION FOR WARM-DENSE MATTER EXPERIMENTS

    E-Print Network [OSTI]

    Seidl, P.A.

    2008-01-01T23:59:59.000Z

    the beam carrying 35.8 mA with a 0.7 mA/#s droop associatedwith the droop of the Marx voltage over this period. From

  4. Progress in Beam Focusing and Compression for Target Heating and Warm Dense Matter Experiments

    E-Print Network [OSTI]

    Seidl, Peter

    2009-01-01T23:59:59.000Z

    current is 35.8 mA with a slight 0.7 mA/"s droop associatedwith the droop of the Marx voltage over this period. Thus,

  5. Diameters of delta Cephei and eta Aquilae Measured with the Navy Prototype Optical Interferometer

    E-Print Network [OSTI]

    J. T. Armstrong; Tyler E. Nordgren; M. E. Germain; Arsen R. Hajian; R. B. Hindsley; C. A. Hummel; D. Mozurkewich; R. N. Thessin

    2000-09-25T23:59:59.000Z

    We have measured the diameters of the Cepheid variables delta Cephei (18 nights) and eta Aquilae (11 nights) with the Navy Prototype Optical Interferometer. The primary results of these observations are the mean angular diameters of these Cepheids: 1.520 +/- 0.014 milliseconds of arc (mas) for delta Cep and 1.69 +/- 0.04 mas for eta Aql. We also report limb-darkened diameters for the check stars in this program: for beta Lac, theta(LD) = 1.909 +/- 0.011 mas, and for 12 Aql, theta(LD) = 2.418 +/- 0.010 mas. When combined with radius estimates from period-radius relations in the literature, the Cepheid angular diameters suggest distances slightly smaller than, but still consistent with, the Hipparcos distances. Pulsations are weakly detected at a level of about 1.5 sigma to 2 sigma for both Cepheids.

  6. Automatic Microaneurysm Detection and Characterization Through Digital Color Fundus Images

    SciTech Connect (OSTI)

    Martins, Charles; Veras, Rodrigo; Ramalho, Geraldo; Medeiros, Fatima; Ushizima, Daniela

    2008-08-29T23:59:59.000Z

    Ocular fundus images can provide information about retinal, ophthalmic, and even systemic diseases such as diabetes. Microaneurysms (MAs) are the earliest sign of Diabetic Retinopathy, a frequently observed complication in both type 1 and type 2 diabetes. Robust detection of MAs in digital color fundus images is critical in the development of automated screening systems for this kind of disease. Automatic grading of these images is being considered by health boards so that the human grading task is reduced. In this paper we describe segmentation and the feature extraction methods for candidate MAs detection.We show that the candidate MAs detected with the methodology have been successfully classified by a MLP neural network (correct classification of 84percent).

  7. S eptember/O ctober 201 4 TH E P ENN S TATER 29 THIS PAST SPRING, a group

    E-Print Network [OSTI]

    speech about never being afraid of failure," wrote Lola Buonomo, "and to live our lives with no regrets: From Xi'an, the group traveled to Yichang to see the Three Gorges Dam (above). The mas- sive source

  8. agent system based: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    MAS and various approaches, like Web services, Ontology, and Data mining techniques, in e-Business that want to improve responsiveness and efficiency of systems so as to extract...

  9. [superscript 15]N-[superscript 15]N Proton Assisted Recoupling in Magic Angle Spinning NMR

    E-Print Network [OSTI]

    Lewandowski, Jozef R.

    We describe a new magic angle spinning (MAS) NMR experiment for obtaining [superscript 15]N?[superscript 15]N correlation spectra. The approach yields direct information about the secondary and tertiary structure of proteins, ...

  10. Lipid Dynamics and ProteinLipid Interactions in 2D Crystals Formed with the ?-Barrel Integral Membrane Protein VDAC1

    E-Print Network [OSTI]

    Ong, Ta-Chung

    We employ a combination of [superscript 13]C/[superscript 15]N magic angle spinning (MAS) NMR and [superscript 2]H NMR to study the structural and functional consequences of different membrane environments on VDAC1 and, ...

  11. Dynamic Nuclear Polarization Study of Inhibitor Binding to the M2[subscript 1860] Proton Transporter from Influenza A

    E-Print Network [OSTI]

    Andreas, Loren B.

    We demonstrate the use of dynamic nuclear polarization (DNP) to elucidate ligand binding to a membrane protein using dipolar recoupling magic angle spinning (MAS) NMR. In particular, we detect drug binding in the proton ...

  12. Electronic structure analyses and activation studies of a dinitrogen-derived terminal nitride of molybdenum

    E-Print Network [OSTI]

    Sceats, Emma Louise, 1978-

    2004-01-01T23:59:59.000Z

    Chapter 1: Complexes obtained by electrophilic attack on a dinitrogen-derived terminal molybdenum nitride: Electronic structure analysis by solid state CP/MAS ?N NMR in combination ... Chapter 2. Carbene chemistry in the ...

  13. attribute decision making: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    6, UPM Decision Making in MAS, March 2007 2344 12;About this lecture This course Zachmann, Gabriel 5 How brains make decisions Quantum Physics (arXiv) Summary: This chapter,...

  14. action-based decision making: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    6, UPM Decision Making in MAS, March 2007 2344 12;About this lecture This course Zachmann, Gabriel 3 How brains make decisions Quantum Physics (arXiv) Summary: This chapter,...

  15. applied decision making: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    6, UPM Decision Making in MAS, March 2007 2344 12;About this lecture This course Zachmann, Gabriel 7 How brains make decisions Quantum Physics (arXiv) Summary: This chapter,...

  16. Characterization of cation environments in polycrystalline forsterite...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    forsterite by Mg-25 MAS, MQMAS, and QCPMG NMR . Abstract: Forsterite (Mg2SiO4) is a silicate mineral frequently studied in the Earth sciences as it has a simple crystal structure...

  17. Juan de Oate in Quivira, 1601: the "Relacin cierta y verdadera" and the Valverde Interrogatory

    E-Print Network [OSTI]

    Craddock, Jerry R.; Polt, John H. R.

    2013-01-01T23:59:59.000Z

    Carroll L. 1995. Rio del Norte: People of the Upper Riocatfish. 161v20 la banda del norte: literally the lado10 do haia la dereera del norte, mientras mas yban en- |

  18. BWR Assembly Optimization for Minor Actinide Recycling

    SciTech Connect (OSTI)

    G. Ivan Maldonado; John M. Christenson; J.P. Renier; T.F. Marcille; J. Casal

    2010-03-22T23:59:59.000Z

    The Primary objective of the proposed project is to apply and extend the latest advancements in LWR fuel management optimization to the design of advanced boiling water reactor (BWR) fuel assemblies specifically for the recycling of minor actinides (MAs).

  19. Optimization of actinide transmutation in innovative lead-cooled fast reactors

    E-Print Network [OSTI]

    Romano, Antonino, 1972-

    2003-01-01T23:59:59.000Z

    The thesis investigates the potential of fertile free fast lead-cooled modular reactors as efficient incinerators of plutonium and minor actinides (MAs) for application to dedicated fuel cycles for transmutation. A methodology ...

  20. Directory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    title> (2) (2) NUCLEAR ENERGY UNIVERSITY PROGRAMS Heterogeneous Recycling in Fast Reactors PI: Forget, Benoit - Mas... (Properties) 5914 10:53 AM 5914 10:53 AM...

  1. Directory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    NEUP09-095abstract.pdf NUCLEAR ENERGY UNIVERSITY PROGRAMS Heterogeneous Recycling in Fast Reactors PI: Forget, Benoit - Mas... (Properties) 62909 8:28 AM 63010 2:59 PM...

  2. Mara Luz Reyes and Florentino Collazo: La Milpa Organic Farm

    E-Print Network [OSTI]

    Rabkin, Sarah

    2010-01-01T23:59:59.000Z

    oportunidad de mejorar su calidad de vida. I: Y si los niosla- mas que nada por la calidad que lleva pienso yo, verdad,Luz es la que cuida la calidad. REYES: Cada quien tenemos,

  3. El Uso de Servicios de Salud Mexicanos por Ciudadanos Estadounidenses en Tijuana

    E-Print Network [OSTI]

    Arredondo, Jorge

    2008-01-01T23:59:59.000Z

    mas accesibles o de mejor calidad que los que se les ofrecenatencion medica de calidad en las ciudades fronterizasIatino, asi como Ia buena calidad de los servicios medicos

  4. Characterization of Cu-ZSM-5 Prepared by Solid-State Ion Exchange of H-ZSM-5 with CuCl

    E-Print Network [OSTI]

    Bell, Alexis T.

    Cl occlusion in the zeolite pores. After SSIE, the resulting Cu-ZSM-5 was characterized by XRD, 27 Al MAS NMR and nitriles,15 the desulfurization of diesel fuel,16 and the oxidative carbony- lation of methanol to dimethyl

  5. Mara Ins Cataln: Cataln Family Farm

    E-Print Network [OSTI]

    Reti, Irene H.

    2010-01-01T23:59:59.000Z

    My son, you have to put compost on it, and dig more, and mixtheir bucket full of compost. We have furrows and furrowshijo tienes que ponerle compost, escarbar mas, revolver bien

  6. Pblico Online Pas: Portugal

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    Publicação. O seu IP não será divulgado, mas ficará registado na nossa base de dados. Quaisquer comentários

  7. Population Structure, Association Mapping of Economic Traits and Landscape Genomics of East Texas Loblolly Pine ( Pinus taeda L.)

    E-Print Network [OSTI]

    Chhatre, Vikram E.

    2013-05-07T23:59:59.000Z

    Improvement Program (WGFTIP) hosted by the Texas A&M Forest Service. Rapid advances in genomics and molecular marker technology have created potential for application of Marker Assisted Selection (MAS) and Genomic Selection (GS) for accelerated breeding...

  8. Um cientista universitrio

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    a honra de ser seu amigo. Sei como lutou por um país que não fosse só mais desenvol- vido, mas também mais

  9. Computing a Cournot Equilibrium in Integers

    E-Print Network [OSTI]

    2014-05-13T23:59:59.000Z

    Page 1 ... variants of these, form a standard topic in oligopoly theory: see, for ex- ample Mas-Colell, Whinston, and Green [4], pp. 389394, or Varian [11], pp.

  10. EE4445 Quiz 2 October 21, 2009

    E-Print Network [OSTI]

    Leach Jr.,W. Marshall

    on the fundamental resonance frequency, the total quality factor, and the on-axis pressure sensitivity. fS is divided the required acoustic mass MAS. MAS = 1 (2fC)2 CAT = 1 + (2fC)2 CAS = 56.8 (c) The total quality factorS = fC 1 + = 13.6 Hz 4. A driver has the parameters: resonance frequency fS = 24 Hz, total quality

  11. MAC 0316/5754 --Conceitos de Linguagens de Programac~ao Primeiro Semestre de 2010

    E-Print Network [OSTI]

    Reverbel, Francisco

    interpretador FWAE/D, mas produza um resultado num´erico diferente em cada uma dessas linguagens. (b) D^e um, mas rode sem problemas e produza um resultado num´erico quando executado por um interpretador FWAE/D. (c) D^e um exemplo de programa que rode sem problemas e produza um resultado num´erico quando execu

  12. CENAS DE VERANO con MARTIN BERASATEGUI TERRAZA MONUMENT

    E-Print Network [OSTI]

    Politècnica de Catalunya, Universitat

    minerales y Cafés Precio por persona: 45 (48.60 iva incluido) 8% IVA no incluido #12;CENAS DE VERANO con blanco, D.O.C. Rioja Mas Alquimia de Torres, D.O. Penedès Aguas minerales y Cafés Precio por persona: 54 blanco, D.O.C. Rioja Mas Alquimia de Torres, D.O. Penedès Aguas minerales y Cafés Precio por persona: 62

  13. Antnio Nvoa Consultor da UNESCO

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    . Essa energia está muito presente no Brasil. > E falta em Portugal? Falta, e muito. Parecemos título de reitor honorário da Universidade de Lisboa. Mas depois regressa ao Brasil, onde planeia ficar a Universidade de Lisboa, mas deixou a reito- ria a António Cruz Serra e mudou-se para o Brasil, onde é consultor

  14. Teatro no Brasil: Como transmitir sinais de dentro das chamas.

    E-Print Network [OSTI]

    Peixoto, Fernando

    1973-10-01T23:59:59.000Z

    FALL 1973 95 mas vlido pela energia e agressividade, pela opo decidida de um teatro (chamado "te-ato") quase auto-destruidor; mas a grupo optou em seguida por um marginalismo cultural (a princpio por recusar-se, com razo, a transformar se numa.... Sua potencialidade como artista criador est sujeita fatores inad missveis. Os que possuem posio assegurada precisam lutar com unhas e dentes, e sobretudo com concesses tticas, para continuarem trabalhando. O que desgasta a energia criadora...

  15. Aplicacion de PCA y tecnicas bayesianas a la clasificacion de pixeles basada en color

    E-Print Network [OSTI]

    Granada, Universidad de

    un su color se determinara cuales de estas son las mas representativas y se realizara la clasificaci industriales [4], el etiquetado de tejidos en imagenes medicas [5],[6] o la localizacion de regiones en im determinar cuales son las mas adecuadas o representativas. Una buena caracterizacion del color en un p

  16. Direct multi-wavelength limb-darkening measurements of three late-type giants with the Navy Prototype Optical Interferometer

    E-Print Network [OSTI]

    M. Wittkowski; C. A. Hummel; K. J. Johnston; D. Mozurkewich; A. R. Hajian; N. M. White

    2001-08-10T23:59:59.000Z

    We present direct measurements of the limb-darkened intensity profiles of the late-type giant stars HR5299, HR7635, and HR8621 obtained with the Navy Prototype Optical Interferometer (NPOI) at the Lowell Observatory. A triangle of baselines with lengths of 18.9 m, 22.2 m, and 37.5 m was used. We utilized squared visibility amplitudes beyond the first minimum, as well as triple amplitudes and phases in up to 10 spectral channels covering a wavelength range of ~650 nm to ~850 nm. We find that our data can best be described by featureless symmetric limb-darkened disk models while uniform disk and fully darkened disk models can be rejected. We derive high-precision angular limb-darkened diameters for the three stars of 7.44 mas +/- 0.11 mas, 6.18 mas +/- 0.07 mas, and 6.94 mas +/- 0.12 mas, respectively. Using the HIPPARCOS parallaxes, we determine linear limb-darkened radii of 114 R$_\\odot \\pm $13 R$_\\odot$, 56 R$_\\odot \\pm $4 R$_\\odot$, and 98 R$_\\odot \\pm $9 R$_\\odot$, respectively. We compare our data to a grid of Kurucz stellar model atmospheres, with them derive the effective temperatures and surface gravities without additional information, and find agreement with independent estimates derived from empirical calibrations and bolometric fluxes. This confirms the consistency of model predictions and direct observations of the limb-darkening effect.

  17. DISTANCE SCALE ZERO POINTS FROM GALACTIC RR LYRAE STAR PARALLAXES

    SciTech Connect (OSTI)

    Benedict, G. Fritz; McArthur, Barbara E.; Barnes, Thomas G. [McDonald Observatory, University of Texas, Austin, TX 78712 (United States); Feast, Michael W. [Centre for Astrophysics, Cosmology and Gravitation, Astronomy Department, University of Cape Town, Rondebosch 7701 (South Africa); Harrison, Thomas E. [Department of Astronomy, New Mexico State University, Las Cruces, NM 88003 (United States); Bean, Jacob L.; Kolenberg, Katrien [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Menzies, John W.; Laney, C. D. [South African Astronomical Observatory, Observatory 7935 (South Africa); Chaboyer, Brian [Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755 (United States); Fossati, Luca [Department of Physics and Astronomy, Open University, Milton Keynes MK7 6AA (United Kingdom); Nesvacil, Nicole [Institute of Astronomy, University of Vienna, A-1180 Vienna (Austria); Smith, Horace A. [Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States); Kochukhov, Oleg [Department of Physics and Astronomy, Uppsala University, 75120 Uppsala (Sweden); Nelan, Edmund P.; Taylor, Denise [STScI, Baltimore, MD 21218 (United States); Shulyak, D. V. [Institute of Astrophysics, Georg-August-University, Friedrich-Hund-Platz 1, D-37077 Goettingen (Germany); Freedman, Wendy L. [The Observatories, Carnegie Institution of Washington, Pasadena, CA 91101 (United States)

    2011-12-15T23:59:59.000Z

    We present new absolute trigonometric parallaxes and proper motions for seven Population II variable stars-five RR Lyr variables: RZ Cep, XZ Cyg, SU Dra, RR Lyr, and UV Oct; and two type 2 Cepheids: VY Pyx and {kappa} Pav. We obtained these results with astrometric data from Fine Guidance Sensors, white-light interferometers on Hubble Space Telescope. We find absolute parallaxes in milliseconds of arc: RZ Cep, 2.12 {+-} 0.16 mas; XZ Cyg, 1.67 {+-} 0.17 mas; SU Dra, 1.42 {+-} 0.16 mas; RR Lyr, 3.77 {+-} 0.13 mas; UV Oct, 1.71 {+-} 0.10 mas; VY Pyx, 6.44 {+-} 0.23 mas; and {kappa} Pav, 5.57 {+-} 0.28 mas; an average {sigma}{sub {pi}}/{pi} = 5.4%. With these parallaxes, we compute absolute magnitudes in V and K bandpasses corrected for interstellar extinction and Lutz-Kelker-Hanson bias. Using these RR Lyrae variable star absolute magnitudes, we then derive zero points for M{sub V} -[Fe/H] and M{sub K} -[Fe/H]-log P relations. The technique of reduced parallaxes corroborates these results. We employ our new results to determine distances and ages of several Galactic globular clusters and the distance of the Large Magellanic Cloud. The latter is close to that previously derived from Classical Cepheids uncorrected for any metallicity effect, indicating that any such effect is small. We also discuss the somewhat puzzling results obtained for our two type 2 Cepheids.

  18. INTEGRATED CONTROL OF NEXT GENERATION POWER SYSTEM

    SciTech Connect (OSTI)

    None

    2010-02-28T23:59:59.000Z

    Control methodologies provide the necessary data acquisition, analysis and corrective actions needed to maintain the state of an electric power system within acceptable operating limits. These methods are primarily software-based algorithms that are nonfunctional unless properly integrated with system data and the appropriate control devices. Components of the control of power systems today include protective relays, supervisory control and data acquisition (SCADA), distribution automation (DA), feeder automation, software agents, sensors, control devices and communications. Necessary corrective actions are still accomplished using large electromechanical devices such as vacuum, oil and gas-insulated breakers, capacitor banks, regulators, transformer tap changers, reclosers, generators, and more recently FACTS (flexible AC transmission system) devices. The recent evolution of multi-agent system (MAS) technologies has been reviewed and effort made to integrate MAS into next generation power systems. A MAS can be defined as â??â?¦a loosely-coupled network of problem solvers that work together to solve problems that are beyond their individual capabilitiesâ?¦â?. These problem solvers, often called agents, are autonomous and may be heterogeneous in nature. This project has shown that a MAS has significant advantages over a single, monolithic, centralized problem solver for next generation power systems. Various communication media are being used in the electric power system today, including copper, optical fiber and power line carrier (PLC) as well as wireless technologies. These technologies have enabled the deployment of substation automation (SA) at many facilities. Recently, carrier and wireless technologies have been developed and demonstrated on a pilot basis. Hence, efforts have been made by this project to penetrate these communication technologies as an infrastructure for next generation power systems. This project has thus pursued efforts to use specific MAS methods as well as pertinent communications protocols to imbed and assess such technologies in a real electric power distribution system, specifically the Circuit of the Future (CoF) developed by Southern California Edison (SCE). By modeling the behavior and communication for the components of a MAS, the operation and control of the power distribution circuit have been enhanced. The use of MAS to model and integrate a power distribution circuit offers a significantly different approach to the design of next generation power systems. For example, ways to control a power distribution circuit that includes a micro-grid while considering the impacts of thermal constraints, and integrating voltage control and renewable energy sources on the main power system have been pursued. Both computer simulations and laboratory testbeds have been used to demonstrate such technologies in electric power distribution systems. An economic assessment of MAS in electric power systems was also performed during this project. A report on the economic feasibility of MAS for electric power systems was prepared, and particularly discusses the feasibility of incorporating MAS in transmission and distribution (T&D) systems. Also, the commercial viability of deploying MAS in T&D systems has been assessed by developing an initial case study using utility input to estimate the benefits of deploying MAS. In summary, the MAS approach, which had previously been investigated with good success by APERC for naval shipboard applications, has now been applied with promising results for enhancing an electric power distribution circuit, such as the Circuit of the Future developed by Southern California Edison. The results for next generation power systems include better ability to reconfigure circuits, improve protection and enhance reliability.

  19. Investigation of Mechanical Activation on Li-N-H Systems Using 6Li Magic Angle Spinning Nuclear Magnetic Resonance at Ultra-High Field

    SciTech Connect (OSTI)

    Hu, Jian Zhi; Kwak, Ja Hun; Yang, Zhenguo; Osborn, William; Markmaitree, Tippawan; Shaw, Leonard D.

    2008-07-15T23:59:59.000Z

    Abstract The significantly enhanced spectral resolution in the 6Li MAS NMR spectra of Li-N-H systems at ultra-high field of 21.1 tesla is exploited, for the first time, to study the detailed electronic and chemical environmental changes associated with mechanical activation of Li-N-H system using high energy balling milling. Complementary to ultra-high field studies, the hydrogen discharge dynamics are investigated using variable temperature in situ 1H MAS NMR at 7.05 tesla field. The significantly enhanced spectral resolution using ultra-high filed of 21.1 tesla was demonstrated along with several major findings related to mechanical activation, including the upfield shift of the resonances in 6Li MAS spectra induced by ball milling, more efficient mechanical activation with ball milling at liquid nitrogen temperature than with ball milling at room temperature, and greatly enhanced hydrogen discharge exhibited by the liquid nitrogen ball milled samples.

  20. Minor Actinide Recycle in Sodium Cooled Fast Reactors Using Heterogeneous Targets

    SciTech Connect (OSTI)

    Samuel Bays; Pavel Medvedev; Michael Pope; Rodolfo Ferrer; Benoit Forget; Mehdi Asgari

    2009-04-01T23:59:59.000Z

    This paper investigates the plausible design of transmutation target assemblies for minor actinides (MA) in Sodium Fast Reactors (SFR). A heterogeneous recycling strategy is investigated, whereby after each reactor pass, un-burned MAs from the targets are blended with MAs produced by the driver fuel and additional MAs from Spent Nuclear Fuel (SNF). A design iteration methodology was adopted for customizing the core design, target assembly design and matrix composition design. The overall design was constrained against allowable peak or maximum in-core performances. While respecting these criteria, the overall design was adjusted to reduce the total number of assemblies fabricated per refueling cycle. It was found that an inert metal-hydride MA-Zr-Hx target matrix gave the highest transmutation efficiency, thus allowing for the least number of targets to be fabricated per reactor cycle.

  1. Honeywell Modular Automation System Acceptance Test Procedure

    SciTech Connect (OSTI)

    STUBBS, A.M.

    1999-09-21T23:59:59.000Z

    The purpose of this Acceptance Test Procedure (ATP) is to verify the operability of the three new furnaces as controlled by the new Honeywell Modular Automation System (MAS). The Honeywell MAS is being installed in PFP to control the three thermal stabilization furnaces in glovebox HA-211. The ATP provides instructions for testing the configuration of the Honeywell MAS at the Plutonium Finishing Plant(PFP). The test will be a field test of the analog inputs, analog outputs, and software interlocks. The interlock test will check the digital input and outputs. Field equipment will not be connected forth is test. Simulated signals will be used to test thermocouple, limit switch, and vacuum pump inputs to the PLUMAS.

  2. Proper Motion of Pulsar B1800-21

    E-Print Network [OSTI]

    W. F. Brisken; M. Carrillo-Barragan; S. Kurtz; J. P. Finley

    2006-10-20T23:59:59.000Z

    We report high angular resolution, multi-epoch radio observations of the young pulsar PSR B1800-21. Using two pairs of data sets, each pair spanning approximately a ten year period, we calculate the proper motion of the pulsar. We obtain a proper motion of mu_alpha=11.6 +- 1.8 mas/yr, mu_delta=14.8 +- 2.3 mas/yr, which clearly indicates a birth position at the extreme edge of the W30 supernova remnant. Although this does not definitively rule out an association of W30 and PSR B1800-21, it does not support an association.

  3. Ring shaped 6.7 GHz methanol maser emission around a young high-mass star

    E-Print Network [OSTI]

    A. Bartkiewicz; M. Szymczak; H. J. van Langevelde

    2005-09-21T23:59:59.000Z

    We report on EVN imaging of the 6.7 GHz methanol maser emission from the candidate high-mass protostar G23.657-0.127. The masers originate in a nearly circular ring of 127 mas radius and 12 mas width. The ring structure points at a central exciting object which characteristics are typical for a young massive star; its bolometric luminosity is estimated to be methanol masers originate in a spherical bubble or in a rotating disc seen nearly face-on.

  4. The grotesque in Don Quijote de la Mancha by Miguel de Cervantes Saavedra and The Tyrant by Ramon Del Valle-Inclan

    E-Print Network [OSTI]

    Peterson, Valerie Hoppe

    1994-01-01T23:59:59.000Z

    lo sublime. Cree que la literatura americana lo contiene mAs. De los personajes 11 que estudia, tienen una multitud de calidades complejas y contradictorias. O' Connor afirma que los personajes mezclados crean un mundo extrano que molesta nuestro... calidades ridiculas. Cree que lo grotesco viene de una region de la mente demoniaca. A el no le importa si los demonios vienen de lo mas a115 o dentro de nuestras mentes porque para el es lo mismo (Barasch xiii-xv). Segun Jennings, hay un efecto triple...

  5. Honeywell Modular Automation System Computer Software Documentation

    SciTech Connect (OSTI)

    STUBBS, A.M.

    2000-12-04T23:59:59.000Z

    The purpose of this Computer Software Document (CSWD) is to provide configuration control of the Honeywell Modular Automation System (MAS) in use at the Plutonium Finishing Plant (PFP). This CSWD describes hardware and PFP developed software for control of stabilization furnaces. The Honeywell software can generate configuration reports for the developed control software. These reports are described in the following section and are attached as addendum's. This plan applies to PFP Engineering Manager, Thermal Stabilization Cognizant Engineers, and the Shift Technical Advisors responsible for the Honeywell MAS software/hardware and administration of the Honeywell System.

  6. Completeness of USNO-B for High Proper-Motion Stars

    E-Print Network [OSTI]

    Gould, A

    2003-01-01T23:59:59.000Z

    I test the completeness of USNO-B detections of high proper-motion (mu>0.18"/yr) stars and the accuracy of its measurements by comparing them to the revised NLTT (rNLTT) catalog of Salim & Gould. For 14.5~20mas/yr) may actually have still larger errors than tabulated.

  7. Clearing Debris from Land (Spanish)

    E-Print Network [OSTI]

    McFarland, Mark L.

    2007-10-08T23:59:59.000Z

    costo es elevado. ? Utilice una astilladora para eliminar las ra- mas m?s peque?as y reducir el volumen de espacio necesario para enterrar. Botadero ? Puede colocar los escombros de ?rboles en surcos en erosi?n (donde la tierra no es apta para...

  8. Solar Implementation Plan for Solar America Cities DRAFT 1.0: September 2007 "DeSn o o , Neal" NDeSn o o @c i. ber keley . c a. us , Alic en Kan dt (E-m ail) , Alic ia Ber t (E-

    E-Print Network [OSTI]

    Kammen, Daniel M.

    Sn o o @c i. ber keley . c a. us , Alic en Kan dt (E-m ail) , Alic ia Ber t (E- m ail) m >, Br uc e Mas t (E-m ail) , "Bur r o ug hs , Tim o thy " , CalBr o o m head(E-m ail)

  9. LiU E-Press Linkoping University Electronic Press 2006-01

    E-Print Network [OSTI]

    Zhao, Yuxiao

    for the E-Press. Increasing the publication of PhD and licentiate theses has been our first priority on the committee report, specifies two major priorities: to increase the publication of doctorate and licentiate(1 reasons 1 The licentiate degree is a Swedish research degree that is in-between the mas- ter

  10. ccsd00003868, Symmetry and interactivity in

    E-Print Network [OSTI]

    interplay is about, before we enter into the more speci#12;c topic we have in mind here, namely symmetry in which computation is proof search. I am speaking here of the larger match between two kinds of wide proofs { interesting ones rely on various lemmas, sublem- mas, etc... {, checking them, or searching them

  11. The holonic enterprise: a model for Internet-enabled global manufacturing supply chain and workflow

    E-Print Network [OSTI]

    Ulieru, Mihaela

    The holonic enterprise: a model for Internet-enabled global manufacturing supply chain and workflow, which supports organizational information that, in turn, can mirror social organization. The Holonic with an overview of the three main concepts used to develop our HE model: holonic systems, MAS, and the Internet

  12. JOB SUMMARY JOB TITLE: RESEARCH FELLOW (Multi-Agent Systems for Large-Scale Evolving SCADA (Research Fellows

    E-Print Network [OSTI]

    Liu, Weiru

    JOB SUMMARY JOB TITLE: RESEARCH FELLOW (Multi-Agent Systems for Large-Scale Evolving SCADA, the research topics include: (i) developing multi-agent system architecture for supporting SCADA systems-agent environments and integrating planning knowledge; (iii) investigating security vulnerabilities in MAS for SCADA

  13. E.T.S.I. Industriales: Resistencia de Materiales 2 PROBLEMAS TEMA 5: MEMBRANAS DE

    E-Print Network [OSTI]

    Romero, Ignacio

    3 mm calcular las tensiones en los puntos mas cercanos al eje de revolucion. 5.4 Un deposito esferico casquete esferico de altura h y radio r V = 3 h2 (3r - h) z r e 2 #12;

  14. Devices and process for high-pressure magic angle spinning nuclear magnetic resonance

    DOE Patents [OSTI]

    Hoyt, David W; Sears, Jr., Jesse A; Turcu, Romulus V.F.; Rosso, Kevin M; Hu, Jian Zhi

    2014-04-08T23:59:59.000Z

    A high-pressure magic angle spinning (MAS) rotor is detailed that includes a high-pressure sample cell that maintains high pressures exceeding 150 bar. The sample cell design minimizes pressure losses due to penetration over an extended period of time.

  15. Institutions and Cross-border Mergers and Acquisitions (M&A) Value Creation

    E-Print Network [OSTI]

    Zhu, Hong

    2012-02-14T23:59:59.000Z

    Cross-border Merger and Acquisitions (M&As) are an increasingly important strategy adopted by firms in order to create value in fiercely competitive global markets. Cross-border M&A value creation, that is, wealth creation for shareholders from...

  16. Perturbation of nuclear spin polarizations in solid state NMR of nitroxide-doped samples by magic-angle spinning without microwaves

    SciTech Connect (OSTI)

    Thurber, Kent R., E-mail: thurberk@niddk.nih.gov; Tycko, Robert [Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520 (United States)] [Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520 (United States)

    2014-05-14T23:59:59.000Z

    We report solid state {sup 13}C and {sup 1}H nuclear magnetic resonance (NMR) experiments with magic-angle spinning (MAS) on frozen solutions containing nitroxide-based paramagnetic dopants that indicate significant perturbations of nuclear spin polarizations without microwave irradiation. At temperatures near 25 K, {sup 1}H and cross-polarized {sup 13}C NMR signals from {sup 15}N,{sup 13}C-labeled L-alanine in trinitroxide-doped glycerol/water are reduced by factors as large as six compared to signals from samples without nitroxide doping. Without MAS or at temperatures near 100 K, differences between signals with and without nitroxide doping are much smaller. We attribute most of the reduction of NMR signals under MAS near 25 K to nuclear spin depolarization through the cross-effect dynamic nuclear polarization mechanism, in which three-spin flips drive nuclear polarizations toward equilibrium with spin polarization differences between electron pairs. When T{sub 1e} is sufficiently long relative to the MAS rotation period, the distribution of electron spin polarization across the nitroxide electron paramagnetic resonance lineshape can be very different from the corresponding distribution in a static sample at thermal equilibrium, leading to the observed effects. We describe three-spin and 3000-spin calculations that qualitatively reproduce the experimental observations.

  17. d Science Service Yeatwe L.ms.??-OE receipt

    E-Print Network [OSTI]

    evoi2ii7.g of lhrch 11 tkere mas a gelltle rain, a ~ dit too was hailed 3ut 557 aext morni:ig Tninter t i c i a n Xoscoe Coilklin xe sankaalked from h i s office i n Ydl Street to h i s club hear Xadison

  18. Pas: Portugal Period.: Diria

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    com validade de séculos. Há um ano tornou-se curador do departamento de Design e Arquitectura do Museu do futebol, mas na arquitectura e no cinema é onde temos visto emergir novos valores, com gente-se fazendo. No campo da arquitectura começa com Siza, Távora e outras referências dos anos 50 com

  19. Modelling regulations Completing an incomplete regulation

    E-Print Network [OSTI]

    van der Torre, Leon

    Objectives Modelling regulations Completing an incomplete regulation Examples Discussion Consistency and Completeness of Regulations Laurence Cholvy1 Stephanie Roussel1,2 1ONERA Centre de Toulouse 2ISAE, Toulouse NorMAS 2008, Luxembourg, July 2008 cholvy Consistency and Completeness of Regulations

  20. 170 BULLETIN OF THE UNITED STATES FISH COMMISSTON. 85.-MEMORANDA R E L A T I V E T O INCLOBUBES FOBl THE CONFINIE-

    E-Print Network [OSTI]

    in extreme depth, was formed by the erection of a dam. The bottom of this pond was mainly a grassy sod newly at the depth of G feet. This inclosure was a complete failure. Tlie salmon placed therein were after a day in it again. No. 2.-After the failure of the above cxperiment an inclosure mas made in the edge of an ordinary

  1. IAU Symposium 219: Stars as Suns: Activity, Evolution, Planets ASP Conference Series, Vol. XX, 2004

    E-Print Network [OSTI]

    Guedel, Manuel

    IAU Symposium 219: Stars as Suns: Activity, Evolution, Planets ASP Conference Series, Vol. XX, 2004 generation and energy release in stellar atmospheres. The nature of this interplay is surprisingly di right: VLBI image of Algol (Mutel et al. 1998; units: mas). Bottom left: Model for a radio magnetosphere

  2. Resistencia de Materiales I Presentacion de la asignatura

    E-Print Network [OSTI]

    Romero, Ignacio

    generaliza las ecuaciones de Newton y Euler a medios no rigidos. Calculo y algebra vectorial y tensorial gobiernan el el movimiento y deformacion de los solidos (en el caso mas sencillo: elastico, lineal

  3. Algebra lineal I, FAMAT, ene-jun, 2009 Examen parcial 1

    E-Print Network [OSTI]

    Bor, Gil

    Algebra lineal I, FAMAT, ene-jun, 2009 Examen parcial 1 Viernes, 13 mar, 2009 Cierto o Falso ecuaciones lineales tiene por lo menos una solucion. 2. Todo sistema homogeneo de ecuaciones lineales tiene por lo menos una solucion. 3. Si un sistema de ecuaciones lineales tiene mas que una solucion entonces

  4. Algebra lineal 2, FAMAT, agto-dic, 2009 Tarea num. 12

    E-Print Network [OSTI]

    Bor, Gil

    Algebra lineal 2, FAMAT, agto-dic, 2009 Tarea num. 12 Para el viernes, 6 nov 2009 Definiciones. Sea T : V V un operador lineal con valor propio . El subespacio E = {v V |Tv = v} se llama el que la multiplicidad geometrica de un valor propio de un operador lineal no es mas grande que su

  5. Einstein e os Bilogos Gisele A. Oda

    E-Print Network [OSTI]

    Ribas, Roberto Vicenotto

    Einstein e os Bilogos Gisele A. Oda Ps-doutoranda do Departamento de Fsica Aplicada (Bifusp 06/05/2005) Neste ano dedicado divulgao da obra de Einstein, vale a pena conhecer fatos menos famosos mas, ainda". No mesmo livro, relata tambm o encontro entre Einstein e Karl Von Frisch(**), da forma como ele o

  6. Initial Effects of Brush Cutting and Shoot Removal on Willow Browse Quality Roy V. Rea1

    E-Print Network [OSTI]

    Gillingham, Michael

    range. Resumen Examinamos los efectos iniciales del corte de arbustos (remocion de toda la biomasa ae. Especificamente evaluamos los cambios de la biomasa, contenido de taninos, energia y protei's willow'' que habian recibido corte de arbusto fueron superiores en biomasa y mas bajas en protei

  7. Reducing Coalition Structures via Agreement Specification Guido Boella

    E-Print Network [OSTI]

    van der Torre, Leon

    on multiagent systems: a mind structure, a power structure, a dependence structure and a coalition structure systems General Terms MAS theory Keywords Coalition formation, power theory 1. INTRODUCTION The concept agents. In [1] we propose a way to define coalition structures from power structures. In this paper we

  8. The literary representation of certain Spanish castaways who lived among the North American Indians

    E-Print Network [OSTI]

    Protheroe, Mark Douglas

    1996-01-01T23:59:59.000Z

    and acceptance. These four rhetorical styles reflect the variety of the norms and prejudices of colonial society as well as the complexity of the studied texts. Las narraciones de los naufragos y cautivos espanoles del siglo XVI ocupan uno de los fugares mas...

  9. Comput Math Organiz Theor (2006) 12:181204 DOI 10.1007/s10588-006-9543-9

    E-Print Network [OSTI]

    Lpez-Snchez, Maite

    2006-01-01T23:59:59.000Z

    social institutions: A framework for the design of open agent-based electronic marketplaces Christian improve the robustness (i.e., stability, reliability, or scalability) of open multiagent systems (MAS of electronic marketplaces. The framework consists of three different insti- tutional types that are defined

  10. BIO: Milton H. Marquis Professor of Economics

    E-Print Network [OSTI]

    Bowers, Philip L.

    BIO: Milton H. Marquis Professor of Economics Bellamy Building Department of Economics Florida received a Mas- ter of Arts degree in Economics in 1982 and a Ph.D. in Economics in 1985 from Indiana University. He has taught economics and finance at St. Olaf College in Northfield, MN and at Florida State

  11. Normative Agents in Health Care: Uses and Challenges

    E-Print Network [OSTI]

    Utrecht, Universiteit

    Normative Agents in Health Care: Uses and Challenges Javier Vazquez-Salceda institute;Normative Agents in Health Care: Uses and Challenges Javier Vazquez-Salceda 1 Abstract. The use of Multi-Agent Systems (MAS) in health-care domains is increasing. Such Agent-mediated Medical Systems are designed

  12. Perspective The NEW ENGLAND JOURNAL of MEDICINE

    E-Print Network [OSTI]

    Whitton, Mary C.

    in Mas- sachusetts' special Senate election in January sent health care reform into a tailspin. Democrats- ing, as attention turned to the merits of more incremental re- forms. Yet as the health care reform, the political outlook for health care reform is improving, and Democrats are now close to securing enough votes

  13. Plan de trabajo para la clase de hoy 1. Conceptos generales de clasificacion

    E-Print Network [OSTI]

    Van Horebeek, Johan

    1 Plan de trabajo para la clase de hoy 1. Conceptos generales de clasificacion 2. Clasificador k) Definimos la margen de un clasificador lineal como la distancia mas pequena entre una observacion y la. #12;3 Los vectores de soporte son las observaciones que estan a una distancia de la frontera de

  14. Vigilancia en Galerias de Arte Curvilineas Javier Cano-Vila*

    E-Print Network [OSTI]

    Urrutia, Jorge

    un ejemplo en el que se necesiten mas de n 2 guardias para vigilarla. En este trabajo demostramos punto p de ai existe una > 0 tal que cualquier punto al interior de Cai a distancia menor o igual a de

  15. Optimizacion de Algoritmos Geneticos en el Procesamiento de Arboles de Steiner

    E-Print Network [OSTI]

    Jesus, Srgio M.

    distancia total aunque para tal fin sea necesario a~nadir mas puntos a los iniciales. Estos puntosisticas que hagan que mejoren su convergencia. En este trabajo se utilizan tecnicas del segundo grupo, m trabajo aun se encuentra en una fase inicial, aunque ya podemos presentar algunos resultados concretos

  16. SMALL MAMMALS ASSOCIATED WITH COLONIES OF BLACK-TAILED PRAIRIE DOGS (CYNOMYS LUDOVICIANUS) IN THE SOUTHERN HIGH PLAINS

    E-Print Network [OSTI]

    Wallace, Mark C.

    and non-colonies in 2002, but were higher on non-colonies in 2003. Although we may not have detected some diferencias entre los dos tipos de sitios en diversidad y equidad de las especies mas comunes. Los perritos

  17. GEOGRAPHICAL STRUCTURE OF GENETIC VARIATION IN THE MALAGASY SCOPS-OWL INFERRED FROM

    E-Print Network [OSTI]

    detected, four of which were shared by more than one individual. Maximum sequence divergence was 0.6% (mean.6% (promedio 5 0.24%). El haplotipo mas comun fue compartido por diez individuos originarios de localidades

  18. Matching a Human Walking Sequence with a VRML Synthetic Model

    E-Print Network [OSTI]

    Buades Rubio, Jose Mara

    animation, computer vision, medical rehabilitation, virtual reality and entertainment. There is a greatMatching a Human Walking Sequence with a VRML Synthetic Model J. M. Buades, Ramon Mas and Francisco University of the Balearic Islands 07071 Palma de Mallorca, SPAIN {josemaria,ramon,paco}@anim.uib.es Abstract

  19. Special Section The Future of Tropical Species on a Warmer Planet

    E-Print Network [OSTI]

    Bermingham, Eldredge

    temperaturas mas altas de la Tierra antes de que comenzara el calentamiento global y a menudo estan aisladas no extratropicales con rangos de distribucion peque~nos. El impacto biologico del calentamiento global International, 2011 Crystal Drive, Arlington, VA 22202, U.S.A. Abstract: Modern global temperature and land

  20. Ideer haves -innovatrer sges

    E-Print Network [OSTI]

    strategisk frugtbar men kompleks process ENERGI MEDICO SENSORER IT/TELE BIOTECH PROBLEMSTORM MARKEDER RIS FO institionen. Ider er der masser af inden for forskning- en, men der mangler af og til entre- prenrer som kan rummer mas- ser af ideer og teknologier, men mangler ofte de innovatrer der kan bringe ideerne til et

  1. A Solid-State NMR Study of Tungsten Methyl Group Dynamics in [W(5-C5Me5)Me4][PF6

    E-Print Network [OSTI]

    Griffin, Robert G.

    A Solid-State NMR Study of Tungsten Methyl Group Dynamics in [W(5-C5Me5)Me4][PF6] Douglas C. Maus Spinning (MAS) 13C and static 2H NMR studies of the dynamics of the methyl groups coordinated to tungsten

  2. Direct Speciation of Phosphorus in Alum-Amended Poultry Litter

    E-Print Network [OSTI]

    Sparks, Donald L.

    , and Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19717 Amending poultry litter management practice. Although its effectiveness has been demonstrated on a macroscopic scale in the field prerequisite for the assessment of the sustainability of intensive poultry operations. Both solid- state MAS

  3. SecuestrodeCO2enestructurasgeolgicas Modelacin numrica de

    E-Print Network [OSTI]

    Politcnica de Catalunya, Universitat

    Kioto Responsables del 55% de las emisiones se comprometen reducir en 5% el total de emisiones respecto forma diferente A Espaa le corresponde no aumentar en mas de 15% sus emisiones respecto a 1990 En 2006enestructurasgeolgicas Una forma de disminuir emisiones: Almacenamiento de CO2 en estructuras geolgicas Yacimientos de

  4. Haseltonia 14: 161169. 2008 161 1. Introduction

    E-Print Network [OSTI]

    Zürich, Universität

    species occur in cen- Abstract: The most recent treatments of the family Cactaceae for Uruguay floccosa are new records for the flora of Uruguay. The occurrence of Epiphyllum phyllanthus in Uruguay could not be confirmed. Resumen: Los tratamientos mas recientes de la familia Cactaceae para Uruguay son

  5. Ciencias de la Salud Fundacin Caja Rural

    E-Print Network [OSTI]

    Escolano, Francisco

    Ciencias de la Salud Fundacin Caja Rural de Granada VIIIOrganizan Colaboran Para mas informacin Fundacin Caja Rural de Granada decidi otorgar el premio al trabajo "Identificacin de un nuevo Gen, CD247 en el desarrollo de la enfermedad, lo que permitir encontrar nuevos tratamientos capaces de mejorar

  6. Acid and redox activity of template-free Al-rich H-BEA* and Fe-BEA*

    E-Print Network [OSTI]

    Sklenak, Stepan

    sorption, SEM, FTIR, 27 Al 3Q and 29 Si MAS NMR spectroscopy, and DFT calculation of the deprotonation to valuable gasoline and diesel fuels, as well as in production of petrochemicals [1]. In addition, cationic], employed in the end-pipe gases of chemical plants, electric power stations, and exhaust gases of diesel

  7. SPINEVOLUTION: A powerful tool for the simulation of solid and liquid state NMR experiments

    E-Print Network [OSTI]

    Griffin, Robert G.

    SPINEVOLUTION: A powerful tool for the simulation of solid and liquid state NMR experiments Mikhail. Simulations of solid-state magic angle spinning (MAS) experiments can be particularly demanding both with complex pulse sequences and multi-spin systems in solids, SPINEVO- LUTION is a versatile and easy to use

  8. High-resolution solid-state NMR of anisotropically mobile molecules under very low-power 1

    E-Print Network [OSTI]

    Hong, Mei

    High-resolution solid-state NMR of anisotropically mobile molecules under very low-power 1 H Revised 13 May 2009 Available online 21 May 2009 Keywords: Low-power decoupling Lipid membranes Solid such as WALTZ-16. We demonstrate this moderate MAS low-power decoupling technique on hydrated POPC lipid

  9. SPINEVOLUTION: A powerful tool for the simulation of solid and liquid state NMR experiments

    E-Print Network [OSTI]

    Griffin, Robert G.

    SPINEVOLUTION: A powerful tool for the simulation of solid and liquid state NMR experiments Mikhail and dynamic information from the spectra. Simulations of solid-state magic angle spinning (MAS) experiments for the simulation of experiments with complex pulse sequences and multi-spin systems in solids, SPINEVO- LUTION

  10. __-_____-_I____-_I___ _ -I_ -By Charles Pitzhugh Talman,

    E-Print Network [OSTI]

    , of wnich he mas the Emperor Napoleon was present. The em-peror aporoached t o sgeak to him, and Lamarck offered him a book. IIWhati s this?" exclaimed Napoleon. I1Itt8 your absurd meteorology - the book in m i

  11. Parasol and GreenSwitch: Managing Datacenters Powered by Renewable Energy

    E-Print Network [OSTI]

    {goiri,wkatsak,lekien,tdnguyen,ricardob}@cs.rutgers.edu Abstract Several companies have recently of solar panels, a battery bank, and a grid-tie. Third, we describe GreenSwitch, our model-based approach service companies like Google and Microsoft. Collectively, datacenters consume a mas- sive amount

  12. Lick Northern Proper Motion Program. III. Lick NPM2 Catalog

    E-Print Network [OSTI]

    Hanson, R B; Jones, B F; Monet, D G; Hanson, Robert B.; Klemola, Arnold R.; Jones, Burton F.; Monet, David G.

    2004-01-01T23:59:59.000Z

    The Lick Northern Proper Motion (NPM) program, a two-epoch (1947-1988) photographic survey of the northern two-thirds of the sky (Dec. > -23 deg), has measured absolute proper motions, on an inertial system defined by distant galaxies, for 380,000 stars from 8 14) anonymous stars for astrometry and galactic studies, 92,000 bright (B NPM2 proper motions are on the ICRS system, via Tycho-2 stars, to an accuracy of 0.5 mas/yr in each field. RMS proper motion precision is 6 mas/yr. Positional errors average 80 mas at the mean plate epoch 1968, and 200 mas at the NPM2 catalog epoch 2000. NPM2 photographic photometry errors average 0.18 mag in B, and 0.20 mag in B-V. The NPM2 Catalog and the updated (to J2000) NPM1 Catalog are available at the CDS Strasbourg data center and on the NPM WWW site (http://www.ucolick.org/~npm). The NPM2 Catalog completes the Lick Northern Proper Motion program after a half-century of w...

  13. Crato garante para "breve devoluo

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    mem- bros do Governo que forem necessrios para as matrias em causa". Ou seja, com os secretrios de Governo, Nuno Crato limitou-se a res- ponder: "Esperemos que cor- ra bem" para se fazerem "os ajustes s programa, para 2014 a 2020, foi anunciado no incio de dezembro mas ontem o Governo assinalou o seu ar

  14. Universidades aguardam por reforo no Ketificativo

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    Universidades aguardam por reforo no Ketificativo Governo vai devolver menos 12 milhes dos contas Alexandra Incio alexandra.inacio@jn.pt O Governo est a adiar, mas as universidades tm pressa na que tero de- corrente da deciso do TC". Jos Ferreira Gomes ter su- blinhado que o Governo j

  15. "O financiamento da Cincia pretende garantir o

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    "O financiamento da Cincia pretende garantir o crescimento em qualidade" Cortes 0 Governo .proenca@economico.pt #12;O Governo tem sido atacado pelos cortes no financiamento da Cincia. Leonor Parreira desmente e dos investiga- dores e bolseiros fala em cortes de 50%. O Governo quer pro- mover a qualidade, mas os

  16. Tiragem: 35060 Pas: Portugal

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    investimento directo do Estado no ensino superior vai voltar a descer no prximo ano. O Governo prepara-se para procura de novas receitas prprias e de si- multneo aumento da qualidade". O Governo sublinha tambm que que seria devido. O Governo reconheceu o erro, mas s reps 22 milhes de euros, j este Ve- ro

  17. sobre salrios Em causa est o clculo da

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    Reitores e Governo no se entendem sobre salrios Em causa est o clculo da reposio dos salrios. Governo faz com corte de 3,9% mas reitores dizem que de 3%. O Governo e os reitores esto a fazer contas milhes de euros) na sua dotao, em relao ao ano an- terior. No entanto, em Outubro, o Governo aprovou

  18. Reitores reclamam reposio de milhes

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    para analisar a questo financeira que tem mantido reitores e Governo em discusso. As universida- des inteno do Governo restituir "pura e simplesmente" essa verba, mas devolv-la total ou par- cialmente, "havendo folga". Apesar de, recentemente, o CRUP ter cortado relaes com o Governo por um curto perodo de

  19. Tiragem: 46555 Pas: Portugal

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    Tcnica de Lisboa (UTL), na ca- pital, o ministro da Educao, Nu- no Crato, anunciou que o Governo vai Governo. O PBLICO tentou obter uma reaco dos outros dois reitores, mas no foi possvel at hora de aprovao dos esta- tutos e o incio do processo de elei- o dos rgos de governo da nova universidade

  20. Governo apresenta reforma da rede do Superior em Maro sem contributo dos reitores

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    Governo apresenta reforma da rede do Superior em Maro sem contributo dos reitores O Ministrio da, que foi criado em Setembro para apresentar a proposta das universidades ao Governo, foi co- municada que se mantm disponveis "para co- laborar com a tutela" mas s depois do Governo apresentar a sua

  1. ENSINO SUPERIOR Governo cria

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    ENSINO SUPERIOR Governo cria linha de apoio para captar alunos estrangeiros Os fundos devero ser/ato. Os montantes ainda no esto defi- nidos, mas o Governo est a prepa- rar uma linha de financiamento- mento das instituies de ensino superior, congelados pelo Governo, ocorrer " medida que forem

  2. Usando MDA no Desenvolvimento de Sistemas Multi-Agentes Beatriz Alves De Maria Viviane Torres da Silva Carlos Jos Pereira de Lucena

    E-Print Network [OSTI]

    Endler, Markus

    Usando MDA no Desenvolvimento de Sistemas Multi-Agentes Beatriz Alves De Maria Viviane Torres da to support the development of multi-agents systems (MAS). In this paper, we propose the use of MDA in the development of this kind of systems. MDA specifies a structured software development process in modeling

  3. A&A manuscript no. (will be inserted by hand later)

    E-Print Network [OSTI]

    Taylor, Greg

    .20.2; 05.01.1); ASTRONOMY AND ASTROPHYSICS VLBI Observations of GRB Afterglows G. B. Taylor 1 , A. J. Beasley 1 , D. A. Frail 1 , S. R. Kulkarni 2 , & J. E. Reynolds 3 1 National Radio Astronomy Observatory 0.3 mas corresponding to a distance limit of ?3 kpc (Taylor et al. 1997; Taylor et al. 1998

  4. Communicated by M. A. Saghai Maroof V. Geffroy ( ) F. Creusot J. Falquet M. Se vignac

    E-Print Network [OSTI]

    Gepts, Paul

    Are (Masten- broek 1960) and recently re-named Co-2 (Kelly and Young 1996). In North America, breeding · P. Gepts · M. Dron A family of LRR sequences in the vicinity of the Co-2 locus for anthracnose be facilitated by marker-assisted selec- tion (MAS). A RAPD marker, ROH20, linked to the Mesoamerican Co-2

  5. Spectro-interferometry of the Be star delta Sco: Near-Infrared Continuum and Gas Emission Region Sizes in 2007

    E-Print Network [OSTI]

    Millan-Gabet, R; Touhami, Y; Gies, D; Hesselbach, E; Pedretti, E; Thureau, N; Zhao, M; Brummelaar, T ten

    2010-01-01T23:59:59.000Z

    We present near-infrared H and K-band spectro-interferometric observations of the gaseous disk around the primary Be star in the delta Sco binary system, obtained in 2007 (between periastron passages in 2000 and 2011). Observations using the CHARA/MIRC instrument at H-band resolve an elongated disk with a Gaussian FWHM 1.18 x 0.91 mas. Using the Keck Interferometer, the source of the K-band continuum emission is only marginally spatially resolved, and consequently we estimate a relatively uncertain K-band continuum disk FWHM of 0.7 +/- 0.3 mas. Line emission on the other hand, He1 (2.0583 micron) and Br gamma (2.1657 micron), is clearly detected, with about 10% lower visibilities than those of the continuum. When taking into account the continuum/line flux ratio this translates into much larger sizes for the line emission regions: 2.2 +/- 0.4 mas and 1.9 +/- 0.3 mas for He1 and Br gamma respectively. Our KI data also reveal a relatively flat spectral differential phase response, ruling out significant off-cen...

  6. A deep proper motion catalog within the Sloan digital sky survey footprint

    SciTech Connect (OSTI)

    Munn, Jeffrey A.; Harris, Hugh C.; Tilleman, Trudy M. [US Naval Observatory, Flagstaff Station, 10391 West Naval Observatory Road, Flagstaff, AZ 86005-8521 (United States); Hippel, Ted von [Embry-Riddle Aeronautical University, Physical Sciences, 600 South Clyde Morris Boulevard Daytona Beach, FL 32114-3900 (United States); Kilic, Mukremin [University of Oklahoma, Homer L. Dodge Department of Physics and Astronomy, 440 West Brooks Street, Norman, OK 73019 (United States); Liebert, James W. [University of Arizona, Steward Observatory, Tucson, AZ 85721 (United States); Williams, Kurtis A. [Department of Physics and Astronomy, Texas A and M University-Commerce, P.O. Box 3011, Commerce, TX 75429 (United States); DeGenarro, Steven [Department of Astronomy, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712-0259 (United States); Jeffery, Elizabeth, E-mail: jam@nofs.navy.mil, E-mail: hch@nofs.navy.mil, E-mail: trudy@nofs.navy.mil, E-mail: ted.vonhippel@erau.edu, E-mail: kilic@ou.edu, E-mail: jamesliebert@gmail.com, E-mail: kurtis.williams@tamuc.edu, E-mail: studiofortytwo@yahoo.com, E-mail: ejeffery@byu.edu [BYU Department of Physics and Astronomy, N283 ESC, Provo, UT 84602 (United States)

    2014-12-01T23:59:59.000Z

    A new proper motion catalog is presented, combining the Sloan Digital Sky Survey (SDSS) with second epoch observations in the r band within a portion of the SDSS imaging footprint. The new observations were obtained with the 90prime camera on the Steward Observatory Bok 90 inch telescope, and the Array Camera on the U.S. Naval Observatory, Flagstaff Station, 1.3 m telescope. The catalog covers 1098 square degrees to r = 22.0, an additional 1521 square degrees to r = 20.9, plus a further 488 square degrees of lesser quality data. Statistical errors in the proper motions range from 5 mas year{sup ?1} at the bright end to 15 mas year{sup ?1} at the faint end, for a typical epoch difference of six years. Systematic errors are estimated to be roughly 1 mas year{sup ?1} for the Array Camera data, and as much as 24 mas year{sup ?1} for the 90prime data (though typically less). The catalog also includes a second epoch of r band photometry.

  7. Adaptive Noise Reduction toward Low-dose Computed Tomography Hongbing Lu*ad

    E-Print Network [OSTI]

    Adaptive Noise Reduction toward Low-dose Computed Tomography Hongbing Lu*ad , Xiang Lia , Lihong phantom projections acquired by a GE spiral computed tomography (CT) scanner under 10 mAs tube current, computed tomography, adaptive filtering, edge- preserving smoothing, streak artifacts. 1. INTRODUCTION

  8. ARTIGO INTERNET Europa est a desenvolver biblioteca digital de matemtica 24.02.2010 -

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    chama meta-dados) é armazenada em bases de dados ­ mas as várias instituições usam software e modelos de base de dados diferentes, o que cria mais uma dificuldade na criação de um único motor de pesquisa. E

  9. Climatology of Large Sediment Resuspension Events in Southern Lake Michigan

    E-Print Network [OSTI]

    Climatology of Large Sediment Resuspension Events in Southern Lake Michigan David J. Schwab1 the southern basin, is subject to recurrent episodes of mas- sive sediment resuspension by storm-induced waves with the largest events are examined. Our analysis indicates that significant resuspension events in southern Lake

  10. In K. Tuyls, et al, editors, LAMAS 2005, Lecture Notes In Artificial Intelligence, Springer Verlag, Berlin, 2006.

    E-Print Network [OSTI]

    Stone, Peter

    the possibility of autonomous interactions among multiple vehicles. Multiagent Systems (MAS) is the subfield of AI $63 billion (in 2002 US dollars). Each year, Americans burn approximately 5.6 billion gallons of fuel while idling in heavy traffic. Recent advances in artificial intelligence suggest that autonomous

  11. Cadenas de caracteres Expresiones regulares

    E-Print Network [OSTI]

    Gimnez, Domingo

    Algoritmos, de la asignatura de Programacion Master de Bioinformatica Cadenas y expresiones regularesimbolos. Normalmente se almacenan en un vector (un array de una dimension). Las operaciones mas comunes son: Asignacion

  12. La nation l'preuve de la Bolivie. Commentaires sur le vif. Pascale Absi (IRD, UMR 201)

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    mouvements sociaux, d'Hervé Do Alto sur l'histoire du MAS, Zéline Lacombe sur les luttes régionalistes et précipitée du président Sanchez de Lozada exécuteur de l'ajustement structurel en 2003, en constituent les

  13. Deteccion de mutaciones en TFBSs mediante tecnologia difusa

    E-Print Network [OSTI]

    Granada, Universidad de

    on celular o no presentar ningun efecto. De hecho, un genoma humano puede llegar a tener mas de tres regulacion celular es un proceso com- plejo en el que intervienen multitud de mecanismos. La transcripcion de un gen es uno de los procesos clave en la regulacion celular. Este proceso comienza cuando una o

  14. International Journal of Fuzzy Systems, Vol. 7, No. 2, June 2005 85 Evolutionary Agents for Intelligent Transport Systems

    E-Print Network [OSTI]

    Lee, Jonathan

    soft goal is introduced to facilitate the evolution process. Genetic programming operators are employed. Introduction Due to the growing number of cities and transportation networks, traffic congestion, accidents system in distributed environments, the research on Multi-Agent System (MAS) has invoked an increasing

  15. Honeywell Modular Automation System Computer Software Documentation

    SciTech Connect (OSTI)

    CUNNINGHAM, L.T.

    1999-09-27T23:59:59.000Z

    This document provides a Computer Software Documentation for a new Honeywell Modular Automation System (MAS) being installed in the Plutonium Finishing Plant (PFP). This system will be used to control new thermal stabilization furnaces in HA-211 and vertical denitration calciner in HC-230C-2.

  16. INVESTIGACI ON REVISTA MEXICANA DE FISICA 52 (5) 444452 OCTUBRE 2006 Reduction of friction in fluid transport: experimental investigation

    E-Print Network [OSTI]

    Aguilar, Guillermo

    friccion para flujos turbulentos en tuberias mas efectiva (es posible obtener reducciones de hasta un factor de 8 en los coeficientes de friccion en segmentos de tuberias rectas). Desde el punto de vista aplicaciones sigue en proceso, p.ej., en sistemas centrales de calefaccion y aire acondicionado, sistemas hidr

  17. MODELLING AND FORMAL SPECIFICATION OF A MULTIAGENT TELEMEDICINE SYSTEM FOR DIABETES

    E-Print Network [OSTI]

    Zhu, Hong

    MODELLING AND FORMAL SPECIFICATION OF A MULTIAGENT TELEMEDICINE SYSTEM FOR DIABETES CARE Iaki@gbt.tfo.upm.es Keywords: Software agents, MAS Formal Specification, Modelling, Diabetes Care, Telemonitoring, Telemedicine Abstract: This paper presents the modelling and formal specification of a telemedicine system for diabetes

  18. 2013 Graduate Research and Arts Symposium Posters and Exhibits: Tentative Schedule

    E-Print Network [OSTI]

    Johnson, Eric E.

    -Assisted Selection (MAS) to Improve Alfalfa (Medicago sativa L.) Drought Tolerance NMSU Plant and Environmental of Carbon Isotope Discrimination in Drought-stressed Alfalfa (Medicago sativa L.) NMSU Plant of MS2 virus spiked to Nannochloropsis salina grown in wastewater NMSU Biology 16 #12;2013 Graduate

  19. Crack formation in GaAs heteroepitaxial films on Si and SiGe virtual substrates

    E-Print Network [OSTI]

    Crack formation in GaAs heteroepitaxial films on Si and SiGe virtual substrates V. K. Yang, MAs films grown on Si and SiGe virtual substrates analytically and experimentally. The analytical model10 Relaxed SiGe graded layers on Si have produced the highest quality GaAs on Si to date for the integration

  20. Analysis of tru-fueled vhtr prismatic core performance domains

    E-Print Network [OSTI]

    Lewis, Tom Goslee

    2009-05-15T23:59:59.000Z

    and 1.5 kg of minor actinides (MAs). The remainder consists of fission products (FPs) (~30 kg) and depleted uranium (DU) [7]. Elements labeled as TRUs have atomic numbers greater than 92 (uranium) and are created in nuclear reactors from 238 U...

  1. Agent-Grid Integration Ontology Frederic Duvert, Clement Jonquet, Pascal Dugenie, and Stefano A. Cerri

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    Agent-Grid Integration Ontology Frederic Duvert, Clement Jonquet, Pascal Dugenie, and Stefano A, jonquet, dugenie, cerri}@lirmm.fr Abstract. The integration of GRID and MAS (Multi-Agents Systems) is an active research topic. We have recently proposed the Agent-Grid Integration Lan- guage, to describe

  2. A&A manuscript no. (will be inserted by hand later)

    E-Print Network [OSTI]

    ScherrerInsitute, CH5232 Villigen, Switzerland Received 4 July 1999 / Accepted 24 September 1999 Abstract. We report on 3.6 cm VLA and VLBA obser vations of YZ CMi and AD Leo, two nearby dMe stars. We resolve YZ CMi. The VLBA position of YZ CMi has been found to differ by 32 mas from the positions calculated from

  3. U.S. Department of Energy Categorical Exclusion ...

    Broader source: Energy.gov (indexed) [DOE]

    Steam Line Segment Savannah River Site AikenAikenSouth Carolina Dismantle and removal (D&R) of out-of-service steam lines from K-Area to L-Area and C-Area to the X-mas tree on...

  4. A. A. (TONY) EKDALE ACADEMIC POSITION

    E-Print Network [OSTI]

    Johnson, Cari

    .C., & Ekdale, A.A., 2014, Ichnology and sedimentology of an Eocene greensand in Texas: behavioral response: Developments in Sedimentology 64, Elsevier, Amsterdam, p. 139-155. Ekdale, A.A., & Bromley, R.G., 2012, Eolian: Developments in Sedimentology 64, Elsevier, Amsterdam, p. 419-437. Gibert, J.M. de, Mas, G., & Ekdale, A

  5. Solid-State NMR Examination of Alteration Layers on a Nuclear Waste Glasses

    SciTech Connect (OSTI)

    Murphy, Kelly A. [Penn State Univ., State College, PA (United States). Dept. of Chemistry; Washton, Nancy M. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Science Lab.; Ryan, Joseph V. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Pantano, Carlo G. [Penn State Univ., State College, PA (United States). Dept. of Materials Science and Engineering; Mueller, Karl T. [Penn State Univ., State College, PA (United States). Dept. of Chemistry; Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Science Lab.

    2013-06-01T23:59:59.000Z

    Solid-state NMR is a powerful tool for probing the role and significance of alteration layers in determining the kinetics for the corrosion of nuclear waste glass. NMR methods are used to probe the chemical structure of the alteration layers to elucidate information about their chemical complexity, leading to increased insight into the mechanism of altered layer formation. Two glass compositions were examined in this study: a glass preliminarily designed for nuclear waste immobilization (called AFCI) and a simplified version of this AFCI glass (which we call SA1R). Powdered glasses with controlled and known particles sizes were corroded at 90 C for periods of one and five months with a surface-area to solution-volume ratio of 100,000 m-1. 1H-29Si CP-CPMG MAS NMR, 1H-27Al CP-MAS NMR, 1H-11B CP-MAS NMR, and 1H-23Na CP-MAS NMR experiments provide isolated structural information about the alteration layers, which differ in structure from that of the pristine glass. Both glasses studied here develop alteration layers composed primarily of [IV]Si species. Aluminum is also retained in the alteration layers, perhaps facilitated by the observed increase in coordination from [IV]Al to [VI]Al, which correlates with a loss of charge balancing cations. 1H-11B CP-MAS NMR observations indicated a retention of boron in hydrated glass layers, which has not been characterized by previous work. For the AFCI glass, secondary phase formation begins during the corrosion times considered here, and these neophases are detected within the alteration layers. We identify precursor phases as crystalline sodium metasilicates. An important finding is that layer thickness depends on the length of the initial alteration stages and varies only with respect to silicon species during the residual rate regime.

  6. Methylated trivalent arsenicals are potent inhibitors of glucose stimulated insulin secretion by murine pancreatic islets

    SciTech Connect (OSTI)

    Douillet, Christelle [Department of Nutrition, Gillings School of Global Public Health, 2302 MHRC, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7461 (United States); Currier, Jenna [Curriculum in Toxicology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7461 (United States); Saunders, Jesse [Department of Nutrition, Gillings School of Global Public Health, 2302 MHRC, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7461 (United States); Bodnar, Wanda M. [Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7431 (United States); Matouek, Tom [Institute of Analytical Chemistry of the ASCR, v.v.i., Veve? 97, 602 00 Brno (Czech Republic); Stblo, Miroslav, E-mail: styblo@med.unc.edu [Department of Nutrition, Gillings School of Global Public Health, 2302 MHRC, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7461 (United States)

    2013-02-15T23:59:59.000Z

    Epidemiologic evidence has linked chronic exposure to inorganic arsenic (iAs) with an increased prevalence of diabetes mellitus. Laboratory studies have identified several mechanisms by which iAs can impair glucose homeostasis. We have previously shown that micromolar concentrations of arsenite (iAs{sup III}) or its methylated trivalent metabolites, methylarsonite (MAs{sup III}) and dimethylarsinite (DMAs{sup III}), inhibit the insulin-activated signal transduction pathway, resulting in insulin resistance in adipocytes. Our present study examined effects of the trivalent arsenicals on insulin secretion by intact pancreatic islets isolated from C57BL/6 mice. We found that 48-hour exposures to low subtoxic concentrations of iAs{sup III}, MAs{sup III} or DMAs{sup III} inhibited glucose-stimulated insulin secretion (GSIS), but not basal insulin secretion. MAs{sup III} and DMAs{sup III} were more potent than iAs{sup III} as GSIS inhibitors with estimated IC{sub 50} ? 0.1 ?M. The exposures had little or no effects on insulin content of the islets or on insulin expression, suggesting that trivalent arsenicals interfere with mechanisms regulating packaging of the insulin transport vesicles or with translocation of these vesicles to the plasma membrane. Notably, the inhibition of GSIS by iAs{sup III}, MAs{sup III} or DMAs{sup III} could be reversed by a 24-hour incubation of the islets in arsenic-free medium. These results suggest that the insulin producing pancreatic ?-cells are among the targets for iAs exposure and that the inhibition of GSIS by low concentrations of the methylated metabolites of iAs may be the key mechanism of iAs-induced diabetes. - Highlights: ? Trivalent arsenicals inhibit glucose stimulated insulin secretion by pancreatic islets. ? MAs{sup III} and DMAs{sup III} are more potent inhibitors than arsenite with IC{sub 50} ? 0.1 ?M. ? The arsenicals have little or no effects on insulin expression in pancreatic islets. ? The inhibition of insulin secretion by arsenite, MAs{sup III} or DMAs{sup III} is reversible. ? Thus, pancreatic ?-cells may be primary targets for chronic exposure to arsenic.

  7. VLBI AND ARCHIVAL VLA AND WSRT OBSERVATIONS OF THE GRB 030329 RADIO AFTERGLOW

    SciTech Connect (OSTI)

    Mesler, Robert A.; Pihlstroem, Ylva M.; Taylor, Greg B. [Department of Physics and Astronomy, University of New Mexico, MSC07 4220, Albuquerque, NM 87131 (United States); Granot, Johnathan, E-mail: meslerra@unm.edu [Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, College Lane, Hatfield AL10 9AB (United Kingdom)

    2012-11-01T23:59:59.000Z

    We present VLBI and archival Karl G. Jansky Very Large Array (VLA) and Westerbork Synthesis Radio Telescope (WSRT) observations of the radio afterglow from the gamma-ray burst (GRB) of 2003 March 29 (GRB 030329) taken between 672 and 2032 days after the burst. The VLA and WSRT data suggest a simple power-law decay in the flux at 5 GHz, with no clear signature of any rebrightening from the counterjet. We report an unresolved source at day 2032 of size 1.18 {+-} 0.13 mas, which we use in conjunction with the expansion rate of the burst to argue for the presence of a uniform, interstellar-medium-like circumburst medium. A limit of <0.067 mas yr{sup -1} is placed on the proper motion, supporting the standard afterglow model for gamma-ray bursts.

  8. The influence of fiber/matrix interface on the mechanical behavior of Nicalon SiC fiber reinforced glass-ceramic composites

    SciTech Connect (OSTI)

    Liu, Y.M.; Mitchell, T.E. [Los Alamos National Lab., NM (United States); Wadley, H.N.G. [Virginia Univ., Charlottesville, VA (United States). Dept. of Materials Science and Engineering

    1996-11-01T23:59:59.000Z

    Mechanical properties of unidirectional Nicalon SiC fiber reinforced Ca aluminosilicate (CAS/SiC) and Mg aluminosilicate (MAS/SiC) glass-ceramic composites were investigated by tensile testing and nondestructive laser-ultrasound technique. The Ba-stuffed MAS was either undoped or doped with 5% borosilicate glass. Degradation of elastic stiffness constant C{sub 11} in transverse direction due to interface damage was monitored in situ by measuring the laser- generated ultrasound wave velocity. The three composite materials show different characteristics of macroscopic deformation behavior, which is correlated strongly to interface degradation. A stronger reduction trend of the elastic constant C{sub 11} is associated with a larger degree of inelastic deformation. The fracture surfaces also reveal the close relation between fiber pullout length and interfacial characteristics. Interfaces of these composites were studied by TEM; their influence on inhibiting and deflecting matrix cracks is discussed.

  9. Honeywell Modular Automation System Computer Software Documentation for the Magnesium Hydroxide Precipitation Process

    SciTech Connect (OSTI)

    STUBBS, A.M.

    2001-02-01T23:59:59.000Z

    The purpose of this Computer Software Document (CSWD) is to provide configuration control of the Honeywell Modular Automation System (MAS) in use at the Plutonium Finishing Plant (PFP) for the Magnesium Hydroxide Precipitation Process in Rm 23OC/234-52. This CSWD describes hardware and PFP/FFS developed software for control of Magnesium Hydroxide Precipitation process located in room 230, 234-52. The Honeywell and Plant Scape software generate limited configuration reports for the developed control software. These reports are described in the following section and are attached as addendum's. This plan applies to PFP Engineering Manager, Thermal Stabilization Cognizant Engineers, Solutions Stabilization Engineers, and the Shift Technical Advisors responsible for the Honeywell MAS software/hardware and administration of the Honeywell System.

  10. Honeywell modular automation system computer software documentation

    SciTech Connect (OSTI)

    STUBBS, A.M.

    2003-07-02T23:59:59.000Z

    The purpose of this Computer Software Document (CSWD) is to provide configuration control of the Honeywell Modular Automation System (MAS) in use at the Plutonium Finishing Plant (PFP). The Honeywell MAS is used to control the thermal stabilization furnaces in glovebox HA-211. The PFP developed software is being updated to reflect the Polycube Processing and Unwashed Salt Thermal Stabilization program addition. The polycube processing program was installed per HNF-FMP-02-11162-R2. The functional test of the program was performed in JCS work package 22-02-1031, The unwashed salt item program was installed per HNF-FMP-03-16577-RO. The functional test of the program completed in JCS work package 22-03-00654.

  11. Rapid estimation of 4DCT motion-artifact severity based on 1D breathing-surrogate periodicity

    SciTech Connect (OSTI)

    Li, Guang, E-mail: lig2@mskcc.org; Caraveo, Marshall [Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York 10065 (United States); Wei, Jie [Department of Computer Science, City College of New York, New York, New York 10031 (United States); Rimner, Andreas; Wu, Abraham J.; Goodman, Karyn A. [Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, New York 10065 (United States); Yorke, Ellen [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10065 (United States)

    2014-11-01T23:59:59.000Z

    Purpose: Motion artifacts are common in patient four-dimensional computed tomography (4DCT) images, leading to an ill-defined tumor volume with large variations for radiotherapy treatment and a poor foundation with low imaging fidelity for studying respiratory motion. The authors developed a method to estimate 4DCT image quality by establishing a correlation between the severity of motion artifacts in 4DCT images and the periodicity of the corresponding 1D respiratory waveform (1DRW) used for phase binning in 4DCT reconstruction. Methods: Discrete Fourier transformation (DFT) was applied to analyze 1DRW periodicity. The breathing periodicity index (BPI) was defined as the sum of the largest five Fourier coefficients, ranging from 0 to 1. Distortional motion artifacts (excluding blurring) of cine-scan 4DCT at the junctions of adjacent couch positions around the diaphragm were classified in three categories: incomplete, overlapping, and duplicate anatomies. To quantify these artifacts, discontinuity of the diaphragm at the junctions was measured in distance and averaged along six directions in three orthogonal views. Artifacts per junction (APJ) across the entire diaphragm were calculated in each breathing phase and phase-averaged APJ{sup }, defined as motion-artifact severity (MAS), was obtained for each patient. To make MAS independent of patient-specific motion amplitude, two new MAS quantities were defined: MAS{sup D} is normalized to the maximum diaphragmatic displacement and MAS{sup V} is normalized to the mean diaphragmatic velocity (the breathing period was obtained from DFT analysis of 1DRW). Twenty-six patients free-breathing 4DCT images and corresponding 1DRW data were studied. Results: Higher APJ values were found around midventilation and full inhalation while the lowest APJ values were around full exhalation. The distribution of MAS is close to Poisson distribution with a mean of 2.2 mm. The BPI among the 26 patients was calculated with a value ranging from 0.25 to 0.93. The DFT calculation was within 3 s per 1DRW. Correlations were found between 1DRW periodicity and 4DCT artifact severity: ?0.71 for MAS{sup D} and ?0.73 for MAS{sup V}. A BPI greater than 0.85 in a 1DRW suggests minimal motion artifacts in the corresponding 4DCT images. Conclusions: The breathing periodicity index and motion-artifact severity index are introduced to assess the relationship between 1DRW and 4DCT. A correlation between 1DRW periodicity and 4DCT artifact severity has been established. The 1DRW periodicity provides a rapid means to estimate 4DCT image quality. The rapid 1DRW analysis and the correlative relationship can be applied prospectively to identify irregular breathers as candidates for breath coaching prior to 4DCT scan and retrospectively to select high-quality 4DCT images for clinical motion-management research.

  12. X-shooter Science Verification Proposal A special co-moving white dwarfmain sequence pair

    E-Print Network [OSTI]

    Liske, Jochen

    and HD 122750 form a co-moving proper motion pair (PM in mas/yr: RA, Dec, from UCAC-2): WD 1401-147 (-170: The white dwarf (WD) WD 1401-147 and the main sequence (MS) star HD 122750 form a co-moving proper motion laboratory to study the complex physics of pulsating WDs in a quantitative manner. Scientific Case: WD 1401-147

  13. Projeto de pesquisa da UFSC visa

    E-Print Network [OSTI]

    Floeter, Sergio Ricardo

    duas não têm restrição explícita à pesca, mas são importantes patrimônios ecológicos (Ilha do Campeche- roupa e o badejo-mira) não teve significativas diferenças em rela- ção às ilhas do Campeche e do

  14. Environments of deposition and diagenesis of the Jurassic Upper Smackover Formation in the Lincoln Parish area, Louisiana

    E-Print Network [OSTI]

    Palko, Gregory Jonathan

    1980-01-01T23:59:59.000Z

    and intraclastic grainstones, argillaceous, dolomitic mudstones to wackestones with nodular anhydrite stringers, and some mas- sive, bioturbated litharenites, graded litharenites, silt- stones and shales. The two shoaling upwards grainstone cycles that were... is present between the cycles i . +he landward core. I+ is a +idal lat microfacies on the lee o. the island ti at develoved during deposition of the "z lime" or lower shoaling cycle. inter-'idee trough or salt withdrawal basin in the southern vast of +he...

  15. Comparative Genomics of Gossypium spp. through GBS and Candidate Genes Delving into the Controlling Factors behind Photoperiodic Flowering

    E-Print Network [OSTI]

    Young, Carla Jo Logan

    2013-08-09T23:59:59.000Z

    COMPARATIVE GENOMICS OF GOSSYPIUM SPP. THROUGH GBS AND CANDIDATE GENES ? DELVING INTO THE CONTROLLING FACTORS BEHIND PHOTOPERIODIC FLOWERING A Dissertation by CARLA JO LOGAN YOUNG Submitted to the Office of Graduate Studies of Texas A.../Deletion Polymorphism IPGB Institute for Plant Genomics and Biotechnology Ka Non-synonymous Nucleotide Substitution Rate kb Kilobase(s) kDa KiloDalton Ks Synonymous Nucleotide Substitution Rate LD Long Day LD Linkage Disequilibrium MAS Marker Assisted...

  16. Volume 6 Issue 2 January 9, 2012 Open Funding Opportunities

    E-Print Network [OSTI]

    Alabama in Huntsville, University of

    No. ITA-MAS-OPCM-2012-2003089 CFDA No. 11.112 Due Date: 21 February 2012 http://www07.grants. ONRBAA12-005 CFDA No. 12.300 Due Date: White Papers: 2/15/2012 Full Proposals: 5/1/2012 http://www07 and Centers Program-Field Initiated Projects Program Solicitation No. 2011-33807 CFDA No. 84.133G Due Date: 5

  17. ON THE DETECTABILITY OF A PREDICTED MESOLENSING EVENT ASSOCIATED WITH THE HIGH PROPER MOTION STAR VB 10

    SciTech Connect (OSTI)

    Lepine, Sebastien [Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States); DiStefano, Rosanne, E-mail: lepine@amnh.org, E-mail: rd@cfa.harvard.edu [Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

    2012-04-10T23:59:59.000Z

    Extrapolation of the astrometric motion of the nearby low-mass star VB 10 indicates that sometime in late 2011 December or during the first 2-3 months of 2012, the star will make a close approach to a background point source. Based on astrometric uncertainties, we estimate a 1 in 2 chance that the distance of closest approach {rho}{sub min} will be less than 100 mas, a 1 in 5 chance that {rho}{sub min} < 50 mas, and a 1 in 10 chance that {rho}{sub min} < 20 mas. The last would result in a microlensing event with a 6% magnification in the light from the background source and an astrometric shift of 3.3 mas. The lensing signal will however be significantly diluted by the light from VB 10, which is 1.5 mag brighter than the background source in B band, 5 mag brighter in I band, and 10 mag brighter in K band, making the event undetectable in all but the bluer optical bands. However, we show that if VB 10 happens to harbor a {approx}1 M{sub J} planet on a moderately wide ( Almost-Equal-To 0.18 AU-0.84 AU) orbit, there is a chance (1% to more than 10%, depending on the distance of closest approach and orbital period and inclination) that a passage of the planet closer to the background source will result in a secondary event of higher magnification. The detection of secondary events could be made possible with a several-times-per-night multi-site monitoring campaign.

  18. A, Science Service Feature Released on receipt

    E-Print Network [OSTI]

    THE WEATHER Mailed December 13, 1927 By Charles Mtzhugh Talman, Authority on Meteorology UNDfBGROUND ICE Large mas8es of more or l e s s clear ice are found i n the permanently frozen ground of high 1 8 t i t U d e s j as, for examplo,the subsoil of the Siberian tundrm, Such ice is variously known as "ground ice

  19. Heterogeneous organic acid uptake on soot surfaces

    E-Print Network [OSTI]

    Levitt, Nicholas Paul

    2009-05-15T23:59:59.000Z

    Density Functional Theory EC Elemental Carbon FTIR Fourier Transform Infrared Spectroscopy ID Inner Diameter ID-CIMS Ion Drift-Chemical Ionization Mas Spectrometry IR Infrared LYP Le, Yang, and Par MCT Mercury Cadmium Teluride MIR... was thin (~ 1 mg) to prevent total absorbance of IR-light. A Nicolet Magna 560 spectrometer with MCT detector was used to measure spectra at 2 cm -1 resolution for the FTIR investigations. An average of 64 scans was used to collect spectra in a typical...

  20. COBI cobi12199 Dispatch: October 31, 2013 CE: AFL Journal MSP No. No. of pages: 10 PE: XXXXX1

    E-Print Network [OSTI]

    Minor, Emily

    abitat Potencial de Descanso de la Grulla Americana para Guiar la Seleccion de Sitios para Proyectos de Energia Eolica energia eolica se vuelva cada vez mas importante. Usamos esta informacion para identificar areas conflictos entre las grullas y el desarrollo de energia eolica. Sugerimos que este tipo de analisis sea

  1. ALSEP Array E Engineering Model Subpackage No. 2

    E-Print Network [OSTI]

    Rathbun, Julie A.

    test report for EEM Subpackage No. 2. Prepared by: (£. 1~ R. Thomas Approved by:~~:,· Mas REV. NO. OP:- DATE 3/20/72 Title EEM-SPZ Hardware 8 EEM-SP2 Design Limit Vibration Test Levels 9 EEM-SPZ Instrumentation 10 EEM-SP2 Vibration Response Values 11 Title EEM-SP2 (Photo) EEM..;SP2 Instrumentation Alsep SP2

  2. Sminaire Pcsi, novembre 2004, Montpellier, France 1 A. Richard, P. Caron, J.Y. Jamin, T. Ruf (diteurs

    E-Print Network [OSTI]

    Boyer, Edmond

    *, Mostafa ERRAHJ* *Ecole Nationale d'Agriculture, Meknès, Maroc **Cirad, Montpellier, France Résumé -- L'un périmètre irrigué au nord du Maroc que les schémas hydrauliques ont laissé en dehors des zones desservies éclairage, à travers l'étude de cas d'un périmètre irrigué en grande hydraulique au Maroc, sur les attitudes

  3. Tiragem: 18100 Pas: Portugal

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    Alemanhatemum déficedemaisde70milengenheiros. "Apesar da grande propaganda das hipóteses para o Brasil e países africa- nos para os 39%. E o Brasil? O Brasil precisa de 290 mil engenheiros civis, mas quanto à hipóteses de. "Há o caso de empresas portuguesas que vão para o Brasil e levam engenheiros. Depois há as companhias

  4. Modlisation du comportement des neutrons dans un racteur avanc canadien ACR en utilisant les logiciels dvelopps

    E-Print Network [OSTI]

    Meunier, Michel

    Limited (AECL), portant sur la mise au point de logiciels et de schémas de calcul pour le Advanced Candu (pendant 2 ans) sera accordée au candidat retenu. Le projet sera réalisé en partenariat étroit avec l'AECL collaboration avec AECL. Solution retenue Comme l´équation de transport qui régit le comportement des neutrons

  5. V Encuentro de Mujeres de Iberoamrica en las Arts Escnicas

    E-Print Network [OSTI]

    Ortega, Isabel

    2002-10-01T23:59:59.000Z

    las calles de las del trafico de drogas y robos. Hoy su asociacin de vecinos es un ejemplo a seguir, contamos FALL 2002 155 con la colaboracin de las asociaciones de jvenes cargadores, ecologistas, comercio, panaderos, artesanos. Creamos el..., tranquilamente transmite optimismo, inteligencia y simpata. "Estoy mas arregla y ms informal. Mi cabeza est buena y sabe lo que quiere. No olvidemos del amor." Martirio. Cdiz ...

  6. Lick Northern Proper Motion Program. III. Lick NPM2 Catalog

    E-Print Network [OSTI]

    Robert B. Hanson; Arnold R. Klemola; Burton F. Jones; David G. Monet

    2004-06-07T23:59:59.000Z

    The Lick Northern Proper Motion (NPM) program, a two-epoch (1947-1988) photographic survey of the northern two-thirds of the sky (Dec. > -23 deg), has measured absolute proper motions, on an inertial system defined by distant galaxies, for 380,000 stars from 8 NPM1 Catalog contains 148,940 stars in 899 fields outside the Milky Way's zone of avoidance. The 2003 NPM2 Catalog contains 232,062 stars in the remaining 347 NPM fields near the plane of the Milky Way. This paper describes the NPM2 star selection, plate measurements, astrometric and photometric data reductions, and catalog compilation. The NPM2 Catalog contains 120,000 faint (B > 14) anonymous stars for astrometry and galactic studies, 92,000 bright (B NPM2 proper motions are on the ICRS system, via Tycho-2 stars, to an accuracy of 0.5 mas/yr in each field. RMS proper motion precision is 6 mas/yr. Positional errors average 80 mas at the mean plate epoch 1968, and 200 mas at the NPM2 catalog epoch 2000. NPM2 photographic photometry errors average 0.18 mag in B, and 0.20 mag in B-V. The NPM2 Catalog and the updated (to J2000) NPM1 Catalog are available at the CDS Strasbourg data center and on the NPM WWW site (http://www.ucolick.org/~npm). The NPM2 Catalog completes the Lick Northern Proper Motion program after a half-century of work by three generations of Lick Observatory astronomers. The NPM Catalogs will serve as a database for research in galactic structure, stellar kinematics, and astrometry.

  7. Properties of inflow and downdraft air of tropical mesoscale convective systems and the effect of downdrafts on the surface fluxes

    E-Print Network [OSTI]

    Griffith, Jeane Margaret

    1992-01-01T23:59:59.000Z

    PROPERTIES OF INFLOW AND DOWNDRAFT AIR OF TROPICAL MESOSCALE CONVECTIVE SYSTEMS AND THE EFFECT OF DOWNDRAFTS ON THE SURFACE FLUXES A Thesis by JEANE MARGARET GRIFFITH Submitted to the Office of Graduate Studies of Texas A&M University... in partial fulfillment of the requirements for the degree of MAS'IER OF SCIENCE December 1992 Major Subject: Meteorology PROPERTIES OF THE INFLOW AND DOWNDRAFT AIR OF TROPICAL MESOSCALE CONVECTIVE SYSTEMS AND THE EFFECT OF DOWNDRAFTS ON THE SURFACE...

  8. Hortus Imaginum: Essays in Western Art

    E-Print Network [OSTI]

    1974-01-01T23:59:59.000Z

    . Plan of San Simpliciano (Basilica Virginum), Milan (after Borroni) 13. Plan of San Lorenzo, Milan (first project) 14. Plan of the Chapel of San Vittore, Milan (after Verzone) 15. Door of exterior portal, south aisle, Augsburg Cathedral, detail... of Charles V (Italian), 1552. Bologna, Museo Civico 62. Juan de Orea, Triumph of Peace, relief, c. 1551. Granada, Alhambra, west facade of the Palace of Charles V (Photo: Mas) 63. Juan de Orea, Battle of Muhlberg, relief, c. 1552. Granada, Alhambra, west...

  9. Mec^anica Geometrica A entregar ate `a aula de Quarta-feira dia 27 de Outubro

    E-Print Network [OSTI]

    Natário, José

    Sistema Solar conservam o momento angular mas tendem a dissipar energia). 3. (a) Mostre que a express¸c~oes em torno de e3 s~ao est´aveis. (c) Se I1 > I2 > I3 ent~ao para um dado momento angular a energia cin~ao local da energia cin´etica de um corpo r´igido com um ponto fixo e I1 = I2 nas coordenadas de TSO(3

  10. Outros sites Impresa: SIC TV Mais Escape Olhares J. Letras V. Jnior E. Informtica Infoportugal Casas Empregos Assine j HOME WINDOWS 8 IPHONE 5 VDEOS INSLITOS EMPREGOS TI

    E-Print Network [OSTI]

    Instituto de Sistemas e Robotica

    solares do mundo ­ mas em 2014 vai passar a ser conhecida por albergar as 10 estações de antenas que vão da Contenda. Em janeiro, arrancam os trabalhos relacionados com o fornecimento de energia elétrica FACEBOOK EI outro local no nosso continente que tenha tanta exposição solar e tantas condições espetrais

  11. Unidades de Energa Energa mecanica

    E-Print Network [OSTI]

    Bor, Gil

    refrescos) = 11.7 kilowatt-hora (1 foco prendido 117 hrs)] Energa solar Radiacion solar en la tierra: 1 kilowatt por metro cuadrado (max.) [El promedio es la 1/4 parte. Un calentador solar da 60 %; celda-watt-segundo ; 1 cerrillo que se quema = 1 kilo-joule; 1 latido de corazon = 0.5 joules Mas informacion: http://es.wikipedia.org/wiki/Energia

  12. Energas Renovables No Convencionales

    E-Print Network [OSTI]

    Dixon, Juan

    a renovables 17% del costo total del sistema en 2009) y alta penetración Fuente: Revista IEEE Power & EnergyEnergías Renovables No Convencionales Hugh Rudnick Mas allá de la malla Pastoral UC Santiago, 17 a la entrada · Investigación en la PUC 2 #12;Motivación desarrollo renovables · Característica de

  13. Inovao Tecnolgica em Portugal: Que papel para os Doutorados Paulo Ferreira1

    E-Print Network [OSTI]

    Ferreira, Paulo J.

    à base de cortiça ou de fibras têxteis que provasse ser essencial, por exemplo, para o fabrico de universidade. Estes dados mostram dois factos simples mas importantes. Por um lado, ilustram a diferença na dados indicam que a presença de actividades associadas à ciência e tecnologia não está, nos Estados

  14. Comparative Genomics of Gossypium spp. through GBS and Candidate Genes Delving into the Controlling Factors behind Photoperiodic Flowering

    E-Print Network [OSTI]

    Young, Carla Jo Logan

    2013-08-09T23:59:59.000Z

    COMPARATIVE GENOMICS OF GOSSYPIUM SPP. THROUGH GBS AND CANDIDATE GENES ? DELVING INTO THE CONTROLLING FACTORS BEHIND PHOTOPERIODIC FLOWERING A Dissertation by CARLA JO LOGAN YOUNG Submitted to the Office of Graduate Studies of Texas A.../Deletion Polymorphism IPGB Institute for Plant Genomics and Biotechnology Ka Non-synonymous Nucleotide Substitution Rate kb Kilobase(s) kDa KiloDalton Ks Synonymous Nucleotide Substitution Rate LD Long Day LD Linkage Disequilibrium MAS Marker Assisted...

  15. Communiqu de presse -27 fvrier 2013 Expdition Papouasie-Nouvelle-Guine

    E-Print Network [OSTI]

    contreforts du Mont Wilhelm, ils ont inventorié la biodiversité négligée de cette région- clé mais sous sur le terrain. Les travaux de tri et d'identification des spécimens ont à peine commencé, et il des piégeages similaires dans une forêt de plaine). Les schémas de répartition de la biodiversité ne

  16. A review of "Thomas and Rebecca Vaughans Aqua Vit: Non Vitis" by Donald R. Dickson, ed.

    E-Print Network [OSTI]

    Alan Rudrum

    2003-01-01T23:59:59.000Z

    to contemporary Anglican sufferings, is an important contribution to understanding. Donald R. Dickson, ed. Thomas and Rebecca Vaughan?s Aqua Vit?: Non Vitis (British Library MS, Sloane 1741). Tempe: Arizona Center for Medieval and Renaissance Studies, 2001... is to be congratulated and thanked for this volume. Nothing by Tho- mas Vaughan has ever appeared in so handsome a format. Donald Dickson, too, is to be congratulated and thanked. Sloane MS 1741, if not quite in the Aubrey league, still has its difficulties...

  17. facultad de informatica universidad politecnica de madrid

    E-Print Network [OSTI]

    Politcnica de Madrid, Universidad

    e e e e e e e e e ee f f f f f f f f f f f f f f f ff i i i i i i i i i i i i i i i ii #12;A Generic concepto proporciona la manera mas natural de realizar interfaces con bases de datos relacionales. Este interfaz se puede ver como una implementacion alternativa a la de ficheros. La abstraccion del concepto

  18. Astron. Astrophys. 353, 569574 (2000) ASTROPHYSICS

    E-Print Network [OSTI]

    2000-01-01T23:59:59.000Z

    1999 Abstract. We report on 3.6 cm VLA and VLBA observations of YZ CMi and AD Leo, two nearby dMe stars observations of dMe stars have been reported at 18 cm wavelength. For YZ CMi, Benz & Alef (1991) found an upper. We resolve YZ CMi and can fit a circular symmetrical gaussian component of FWHP of 0.98 0.2 mas

  19. High-temperature steam-treatment of PBI, PEEK, and PEKK polymers with H2O and D2O: A solid-state NMR study

    E-Print Network [OSTI]

    Bluemel, Janet

    High-temperature steam-treatment of PBI, PEEK, and PEKK polymers with H2O and D2O: A solid 2014 Keywords: Steam-treatment of PBI, PEEK, PEKK Solid-state NMR Water and D2O uptake polymers a b with D2O steam at temperatures of 150 and 315 C. All samples are studied by TGA, IR, 13 C CP/MAS, 1 H

  20. THE CELESTIAL REFERENCE FRAME AT 24 AND 43 GHz. I. ASTROMETRY

    SciTech Connect (OSTI)

    Lanyi, G. E.; Jacobs, C. S.; Naudet, C. J.; Sovers, O. J.; Zhang, L. D. [Jet Propulsion Laboratory, Caltech, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States); Boboltz, D. A.; Fey, A. L. [U.S. Naval Observatory, 3450 Massachusetts Ave., NW, Washington, DC 20392-5420 (United States); Charlot, P. [Universite de Bordeaux, Observatoire Aquitain des Sciences de l'Univers, BP 89, 33271 Floirac Cedex (France); Fomalont, E. B. [National Radio Astronomy Observatory, 520 Edgemont Rd., Charlottesville, VA 22903 (United States); Geldzahler, B. J. [National Aeronautics and Space Administration, 300 E. St., SW, Washington, DC 20546 (United States); Gordon, D. [NVI Inc./NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Ma, C. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Romney, J. D. [National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801 (United States)

    2010-05-15T23:59:59.000Z

    We present astrometric results for compact extragalactic objects observed with the Very Long Baseline Array at radio frequencies of 24 and 43 GHz. Data were obtained from ten 24 hr observing sessions made over a five-year period. These observations were motivated by the need to extend the International Celestial Reference Frame (ICRF) to higher radio frequencies to enable improved deep space navigation after 2016 and to improve state-of-the-art astrometry. Source coordinates for 268 sources were estimated at 24 GHz and for 131 sources at 43 GHz. The median formal uncertainties of right ascension and declination at 24 GHz are 0.08 and 0.15 mas, respectively. Median formal uncertainties at 43 GHz are 0.20 and 0.35 mas, respectively. Weighted root-mean-square differences between the 24 and 43 GHz positions and astrometric positions based on simultaneous 2.3 and 8.4 GHz Very Long Baseline Interferometry observations, such as the ICRF, are less than about 0.3 mas in both coordinates. With observations over five years we have achieved a precision at 24 GHz approaching that of the ICRF but unaccounted systematic errors limit the overall accuracy of the catalogs.

  1. Kinematic Control of the Inertiality of ICRS Catalogs

    E-Print Network [OSTI]

    V. V. Bobylev

    2005-12-22T23:59:59.000Z

    We perform a kinematic analysis of the Hipparcos and TRC proper motions of stars by using a linear Ogorodnikov-Milne model. All of the distant (r more than 0.2 kpc) stars of the Hipparcos catalog have been found to rotate around the Galactic y axis with an angular velocity of -0.36 +- 0.09 mas/year. One of the causes of this rotation may be an uncertainty in the lunisolar precession constant adopted when constructing the ICRS. In this case? the correction to the IAU (1976) lunisolar precession constant in longitude is shown to be -3.26 +- 0.10 mas/yr. Based on the TRC catalog, we have determined the main Oort constants: A = 14.9 +- 1.0 and B = -10.8 +- 0.3 km/s/kpc. The component of the model that describes the rotation of all TRC stars around the Galactic y axis is nonzero for all magnitudes, My= -0.86 +- 0.11 mas/yr.

  2. Dissecting the AGB star L2 Puppis: a torus in the making

    E-Print Network [OSTI]

    Lykou, F; Paladini, C; Hron, J; Zijlstra, A A; Kluska, J; Norris, B R M; Tuthill, P G; Ramstedt, S; Lagadec, E; Wittkowski, M; Maercker, M; Meisner, J; Mayer, A

    2015-01-01T23:59:59.000Z

    The circumstellar environment of L2 Pup, an oxygen-rich semiregular variable, was observed to understand the evolution of mass loss and the shaping of ejecta in the late stages of stellar evolution. High-angular resolution observations from a single 8 m telescope were obtained using aperture masking in the near-infrared (1.64, 2.30 and 3.74 $\\rm\\mu m$) on the NACO/VLT, both in imaging and polarimetric modes. The aperture-masking images of L2 Pup at 2.30 $\\rm\\mu m$ show a resolved structure that resembles a toroidal structure with a major axis of ~140 milliarcseconds (mas) and an east-west orientation. Two clumps can be seen on either side of the star, ~65 mas from the star, beyond the edge of the circumstellar envelope (estimated diameter is ~27 mas), while a faint, hook-like structure appear toward the northeast. The patterns are visible both in the imaging and polarimetric mode, although the latter was only used to measure the total intensity (Stokes I). The overall shape of the structure is similar at the ...

  3. Resolving the nucleus of Centaurus A at mid-IR wavelengths

    E-Print Network [OSTI]

    Burtscher, Leonard; Jaffe, Walter; Tristram, Konrad R W; Rttgering, Huub J A

    2010-01-01T23:59:59.000Z

    We have observed Centaurus A with the MID-infrared Interferometric instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) at resolutions of 7 - 15 mas (at 12.5 micron) and filled gaps in the (u,v) coverage in comparison to earlier measurements. We are now able to describe the nuclear emission in terms of geometric components and derive their parameters by fitting models to the interferometric data. With simple geometrical models, the best fit is achieved for an elongated disk with flat intensity profile with diameter 76 +/- 9 mas x 35 +/- 2 mas (1.41 +/- 0.17 pc x 0.65 +/- 0.03 pc) whose major axis is oriented at a position angle (PA) of 10.1 +/- 2.2 degrees east of north. A point source contributes 47 +/- 11 % of the nuclear emission at 12.5 micron. There is also evidence that neither such a uniform nor a Gaussian disk are good fits to the data. This indicates that we are resolving more complicated small-scale structure in AGNs with MIDI, as has been seen in Seyfert galaxies previously observed ...

  4. Development of a generic computerized nuclear material accountability system

    SciTech Connect (OSTI)

    Cornell, M.D.; O'Leary, J.M.; McCutcheon, S.H.

    1987-01-01T23:59:59.000Z

    A computerized nuclear material accountability system (NucMAS) has been developed jointly by DuPont at Savannah River Plant (SRP) and Los Alamos National Laboratory (LANL). The SRP is faced with the goal of improving the accuracy and timeliness of nuclear material accountability. Limited manpower, funding, and time led to the decision to develop a single, generic, process-independent computer system for use throughout SRP's separations facilities, rather than traditional process-specific accountability computer systems. The NucMAS system is currently being installed in each of the material balance areas (MBAs) within SRP's separations facilities. It services the basic need for management of nuclear material inventory data to support timely, accurate, and consistent accountability reporting. Data input for NucMAS can come from any combination of manual entries and automated input, such as distributed control systems, laboratory computers, and vault surveillance systems. The system can be operated as a traditional, after-the-fact accountability system or in a near-real-time mode in situations where more timely data input is available and material control functions are desired. The granularity at which the accounting is performed is set by the MBA custodian and the level of detail at which input information is available.

  5. Feasibility of an image planning system for kilovoltage image-guided radiation therapy

    SciTech Connect (OSTI)

    Thapa, Bishnu B.; Molloy, Janelle A. [Department of Radiation Medicine, University of Kentucky, Lexington, Kentucky 40536-0293 (United States)

    2013-06-15T23:59:59.000Z

    Purpose: Image guidance has become a standard of care for many treatment scenarios in radiation therapy. This is most typically accomplished by use of kV x-ray devices mounted onto the linear accelerator (Linac) gantry that yield planar, fluoroscopic, and cone-beam computed tomography (CBCT) images. Image acquisition parameters are chosen via preset techniques that rely on broad categorizations in patient anatomy and imaging goal. However, the optimal imaging technique results in detectability of the features of interest while exposing the patient to minimum dose. Herein, the authors present an investigation into the feasibility of developing an image planning system (IPS) for radiotherapy.Methods: In this first phase, the authors focused on developing an algorithm to predict tissue contrast produced by a common radiotherapy planar imaging chain. Input parameters include a CT dataset and simulated planar imaging technique settings that include kV and mAs. Energy-specific attenuation through each voxel of the CT dataset was calculated in the algorithm to derive a net transmitted intensity. The response of the flat panel detector was integrated into the image simulation algorithm. Verification was conducted by comparing simulated and measured images using four phantoms. Comparisons were made in both high and low contrast settings, as well as changes in the geometric appearance due to image saturation. Results: The authors studied a lung nodule test object to assess the planning system's ability to predict object contrast and detectability. Verification demonstrated that the slope of the pixel intensities is similar, the presence of the nodule is evident, and image saturation at high mAs values is evident in both images. The appearance of the lung nodule is a function of the image detector saturation. The authors assessed the dimensions of the lung nodule in measured and simulated images. Good quantitative agreement affirmed the algorithm's predictive capabilities. The invariance of contrast with kVp and mAs prior to saturation was predicted, as well as the gradual loss of object detectability as saturation was approached. Small changes in soft tissue density were studied using a mammography step wedge phantom. Data were acquired at beam qualities of 80 and 120 kVp and over exposure values ranging from 0.04 to 500 mAs. The data showed good agreement in terms of the absolute value of pixel intensities predicted, as well as small variations across the step wedge pattern. The saturation pixel intensity was consistent between the two beam qualities studied. Boney tissue contrast was assessed using two abdominal phantoms. Measured and calculated values agree in terms of predicting the mAs value at which detector saturation, and subsequent loss of contrast occurs. The lack of variation in contrast over mAs values lower than 10 suggests that there is wide latitude for minimizing patient dose. Conclusions: The authors developed and tested an algorithm that can be used to assist in kV imaging technique selection during localization for radiotherapy. Phantom testing demonstrated the algorithm's predictive accuracy for both low and high contrast imaging scenarios. Detector saturation with subsequent loss of imaging detail, both in terms of object size and contrast were accurately predicted by the algorithm.

  6. Asymmetric Surface Brightness Distribution of Altair Observed with the Navy Prototype Optical Interferometer

    E-Print Network [OSTI]

    Naoko Ohishi; Tyler E. Nordgren; Donald J. Hutter

    2004-05-16T23:59:59.000Z

    An asymmetric surface brightness distribution of the rapidly rotating A7IV-V star, Altair, has been measured by the Navy Prototype Optical Interferometer (NPOI). The observations were recorded simultaneously using a triangle of three long baselines of 30m, 37m, and 64m, on 19 spectral channels, covering the wavelength range of 520nm to 850nm. The outstanding characteristics of these observations are (a) high resolution with the minimum fringe spacing of 1.7mas, easily resolving the 3-milliarcsecond (mas) stellar disk, and (b) the measurement of closure phase which is a sensitive indicator to the asymmetry of the brightness distribution of the source. Uniform disk diameters fit to the measured squared visibility amplitudes confirms the Altair's oblate shape due to its rapid rotation. The measured observables of Altair showed two features which are inconsistent with both the uniform-disk and limb-darkened disk models, while the measured observable of the comparison star, Vega, are consistent with the limb-darkened disk model. The first feature is that measured squared visibility amplitudes at the first minimum do not reach 0.0 but rather remain at about 0.02, indicating the existence of a small bright region on the stellar disk. The other is that the measured closure phases show non-zero/180 degrees at all spectral channels, which requires an asymmetric surface brightness distribution. We fitted the measured observables to a model with a bright spot on a limb-darkened disk and found the observations are well reproduced by a bright spot, which has relative intensity of 4.7%, on a 3.38 mas limb-darkened stellar disk. Rapid rotation of Altair indicates that this bright region is a pole, which is brighter than other part of the star owing to gravity darkening.

  7. Accurate measurement of heteronuclear dipolar couplings by phase-alternating R-symmetry (PARS) sequences in magic angle spinning NMR spectroscopy

    SciTech Connect (OSTI)

    Hou, Guangjin, E-mail: hou@udel.edu, E-mail: tpolenov@udel.edu; Lu, Xingyu, E-mail: luxingyu@udel.edu, E-mail: lexvega@comcast.net; Vega, Alexander J., E-mail: luxingyu@udel.edu, E-mail: lexvega@comcast.net; Polenova, Tatyana, E-mail: hou@udel.edu, E-mail: tpolenov@udel.edu [Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA and Pittsburgh Center for HIV Protein Interactions, University of Pittsburgh School of Medicine, 1051 Biomedical Science Tower 3, 3501 Fifth Ave., Pittsburgh, Pennsylvania 15261 (United States)

    2014-09-14T23:59:59.000Z

    We report a Phase-Alternating R-Symmetry (PARS) dipolar recoupling scheme for accurate measurement of heteronuclear {sup 1}H-X (X = {sup 13}C, {sup 15}N, {sup 31}P, etc.) dipolar couplings in MAS NMR experiments. It is an improvement of conventional C- and R-symmetry type DIPSHIFT experiments where, in addition to the dipolar interaction, the {sup 1}H CSA interaction persists and thereby introduces considerable errors in the dipolar measurements. In PARS, phase-shifted RN symmetry pulse blocks applied on the {sup 1}H spins combined with ? pulses applied on the X spins at the end of each RN block efficiently suppress the effect from {sup 1}H chemical shift anisotropy, while keeping the {sup 1}H-X dipolar couplings intact. Another advantage over conventional DIPSHIFT experiments, which require the signal to be detected in the form of a reduced-intensity Hahn echo, is that the series of ? pulses refocuses the X chemical shift and avoids the necessity of echo formation. PARS permits determination of accurate dipolar couplings in a single experiment; it is suitable for a wide range of MAS conditions including both slow and fast MAS frequencies; and it assures dipolar truncation from the remote protons. The performance of PARS is tested on two model systems, [{sup 15}N]-N-acetyl-valine and [U-{sup 13}C,{sup 15}N]-N-formyl-Met-Leu-Phe tripeptide. The application of PARS for site-resolved measurement of accurate {sup 1}H-{sup 15}N dipolar couplings in the context of 3D experiments is presented on U-{sup 13}C,{sup 15}N-enriched dynein light chain protein LC8.

  8. Rotor Design for High Pressure Magic Angle Spinning Nuclear Magnetic Resonance

    SciTech Connect (OSTI)

    Turcu, Romulus V.F.; Hoyt, David W.; Rosso, Kevin M.; Sears, Jesse A.; Loring, John S.; Felmy, Andrew R.; Hu, Jian Z.

    2013-01-01T23:59:59.000Z

    High pressure magic angle spinning (MAS) nuclear magnetic resonance (NMR) with a sample spinning rate exceeding 2.1 kHz and pressure greater than 165 bar has never been realized. In this work, a new sample cell design is reported, suitable for constructing cells of different sizes. Using a 7.5 mm high pressure MAS rotor as an example, internal pressure as high as 200 bar at a sample spinning rate of 6 kHz is achieved. The new high pressure MAS rotor is re-usable and compatible with most commercial NMR set-ups, exhibiting low 1H and 13C NMR background and offering maximal NMR sensitivity. As an example of its many possible applications, this new capability is applied to determine reaction products associated with the carbonation reaction of a natural mineral, antigorite ((Mg,Fe2+)3Si2O5(OH)4), in contact with liquid water in water-saturated supercritical CO2 (scCO2) at 150 bar and 50 deg C. This mineral is relevant to the deep geologic disposal of CO2, but its iron content results in too many sample spinning sidebands at low spinning rate. Hence, this chemical system is a good case study to demonstrate the utility of the higher sample spinning rates that can be achieved by our new rotor design. We expect this new capability will be useful for exploring solid-state, including interfacial, chemistry at new levels of high-pressure in a wide variety of fields.

  9. SU-E-I-95: Personalized Radiography Technical Parameters for Each Patient and Exam

    SciTech Connect (OSTI)

    Soares, F; Camozzato, T; Kahl, G; Soares, A; Zottis, A [Instituto Federal de Santa Catarina, Florianopolis (Brazil)

    2014-06-01T23:59:59.000Z

    Purpose: To determine exact electrical parameters (kV, mAs) a radiological technologist shall use taking account the exam and patient's structure, with guarantee of minimum dose and adequate quality image. Methods: A patient's absorbed dose equation was developed by means of Entrance Skin Dose (ESD), irradiated area and patient width for specific anatomy. ESD is calculated from a developed equation, where entrance surface air-KERMA and backscatter factor are included, with air-to-skin coefficient conversion. We developed specific Lambert-Beer attenuation equations derived from mass energy-absorption coefficients data for skin, fat, and muscle and bone as one tissue. Anatomy tissue thickness distribution at central X-ray location in anteroposterior incidence for hand and chest, was estimate by discounting constant skin and bone thickness from patient measured width, assuming the result as muscle and fat. A clinical research at a big hospital were executed when real parameters (kV, mAs, filtration, ripple) used by technologists were combined with the image quality and patient's data: anatomy width, height and weight. A correlation among the best images acquired and electrical parameters used were confronted with patient's data and dose estimation. The best combinations were used as gold standards. Results: For each anatomy, two equations were developed to calculate voltage (kV) and exposure (mAs) to reproduce and interpolate the gold standards. Patient is measured and data are input into equations, giving radiological technologists the right set of electrical parameters for that specific exam. Conclusion: This work indicates that radiological technologist can personalize the exact electrical parameters for each patient exam, instead of using standard values. It also guarantee that patients under or over-sized measures will receive the right dose for the best image. It will stop wrong empiric adjusts technologists do when examining a non-standard patient and reduce probability of radiography retaken because of over or under exposition.

  10. Radio observations of the gamma-ray quasar 0528+134: Superluminal motion and an extreme scattering event

    E-Print Network [OSTI]

    M. Pohl; W. Reich; T. P. Krichbaum; K. Standke; S. Britzen; H. P. Reuter; P. Reich; R. Schlickeiser; R. L. Fiedler; E. B. Waltman; F. D. Ghigo; K. J. Johnston

    1995-03-22T23:59:59.000Z

    We report on multifrequency radio observations made with the Effelsberg 100-m telescope, the IRAM 30-m telescope and the Green Bank Interferometer between 1992 and 1994 of the $\\gamma$-ray quasar 0528+134. We present a new VLBI based map of 0518+134 at 22 GHz with sub-mas angular resolution observed in November 1992, which shows a one-sided core jet structure of $\\sim$ 5 mas length. One component, seen also previously at 8.4 GHz & 22 GHz, shows apparent superluminal motion with $\\beta_{app}$=4.4$\\pm$1.7. In summer 1993 we observed a major outburst at all frequencies higher than a few GHz, which peaked a few months after a strong outburst in high energy $\\gamma$-rays and showed the canonical time evolution of a cooling and/or expanding electron distribution. Our data indicate that the outburst in the EGRET range originated very close to the central object of the AGN and that a remnant of this outburst moved further outward in the jet until it became optically thin at radio frequencies after a few months. During the flare in July 1993 we observed with the Effelsberg 100-m telescope an unusually strong decrease of the flux density by about 50% at 4.75 GHz and 10.55 GHz and slightly less at 2.695 GHz. This behaviour is also seen in the monitoring data at 2.25 GHz and 8.3 GHz taken with the Green Bank Interferometer (NRL-GBI). An extreme scattering event by a small dense plasma cloud in the line of sight is able to match the observed time lag in the lightcurves if we take into account the mas-structure of the source and different spectra of the components on the basis of their brightness in the VLBI maps.

  11. Studies of Secondary Melanoma on C57BL/6J Mouse Liver Using 1H NMR Metabolomics

    SciTech Connect (OSTI)

    Feng, Ju; Isern, Nancy G.; Burton, Sarah D.; Hu, Jian Z.

    2013-10-31T23:59:59.000Z

    NMR metabolomics, consisting of solid state high resolution (hr) magic angle spinning (MAS) 1H NMR (1H hr-MAS), liquid state high resolution 1H-NMR, and principal components analysis (PCA) has been used to study secondary metastatic B16-F10 melanoma in C57BL/6J mouse liver . The melanoma group can be differentiated from its control group by PCA analysis of the absolute concentrations or by the absolute peak intensities of metabolites from either 1H hr-MAS NMR data on intact liver tissues or liquid state 1H-NMR spectra on liver tissue extracts. In particular, we found that the absolute concentrations of alanine, glutamate, creatine, creatinine, fumarate and cholesterol are elevated in the melanoma group as compared to controls, while the absolute concentrations of succinate, glycine, glucose, and the family of linear lipids including long chain fatty acids, total choline and acylglycerol are decreased. The ratio of glycerophosphocholine to phosphocholine is increased by about 1.5 fold in the melanoma group, while the absolute concentration of total choline is actually lower in melanoma mice. These results suggest the following picture in secondary melanoma metastasis: Linear lipid levels are decreased by beta oxidation in the melanoma group, which contributes to an increase in the synthesis of cholesterol, and also provides an energy source input for TCA cycle. These findings suggest a link between lipid oxidation, the TCA cycle and the hypoxia-inducible factors (HIF) signal pathway in tumor metastases. Thus this study indicates that the metabolic profile derived from NMR analysis can provide a valuable bio-signature of malignancy and cell hypoxia in metastatic melanoma.

  12. A laboratory screening technique for evaluating the reaction of selected maize cultivars (Zea mays L.) to maize rayado fino virus

    E-Print Network [OSTI]

    Skinner, Glenn Earl

    1979-01-01T23:59:59.000Z

    s L. ) to Maize Rayado Fino Virus. (December 1979) Glenn Earl Skinner, B. S. , Texas A&M University Chairman of Advisory Committee: Dr. Anton J. Bockholt Fifty inbred lines and 8 single-cross maize hybrids (Zea m~as L. ) were inoculated with maize... or newly developed varieties (7) . Th '. tt* th ill ' gp g 1 ll th tyl 1th l~l 'ourna l. Attempts have been made to gain information on the performance of U. S. maize germplasm in areas with a high incidence of MRFV, but these attempts have not been...

  13. The Exploration and Preliminary Colonization of the Seno Mexicano under don Jos de Escandn (1747-1749): An Analysis Based on Primary Spanish Manuscripts

    E-Print Network [OSTI]

    Cunningham, Debbie S.

    2011-10-21T23:59:59.000Z

    precisso dexarla con el competente se- guro me vali de nominar veinte de los expressados sol- dados para que con un cavo de satisfaccon se quedaran en ella, lo que me costo trabajo a fin de que lo hiziessen sin 5 disgustarse. Ciento de los soldados de... dicho Rio Grande como veinte y qua- tro leguas a el noroeste de el expressado de San Ju- an sin mas costo que el de llevarla por el rio abajo en balsas. Piedra hai mui poca, cuyo defecto pueden 10 suplir las tapias y ladrillo. Hai algun ganado...

  14. Mass of He-8

    E-Print Network [OSTI]

    Tribble, Robert E.; Cossairt, J. D.; May, D. P.; Kenefick, R. A.

    1977-01-01T23:59:59.000Z

    PHVSICAI. REVIEW e VOI. UME 16, NOVEMBER 1977 Ma~s of aHef R. E. Tribble, ~ J. D. Cossairt, D. P. May, and R. A. Kenefiek Cyclotron Institute and Physics Department, Texas A AM University, College Station, Texas 77843 (Received 6 July 1977) A...& 600- pm Si solid-state detector, in the focal plane of an Enge split-pole magnetic spectrograph. Particle identification was deter- mined from the three constraints: (I}(dE/dx}~, (3) Ez?and (3) time of flight relative to the cyclo- tron rf...

  15. Doctor of Engineering internship at Cameron Iron Works: an internship report

    E-Print Network [OSTI]

    Platou, John Stoud, 1951-

    2013-03-13T23:59:59.000Z

    needed equipment for any other Cameron engineering area. This unique responsibility made it the best possible location for an internship. The Wellhead group has responsibility for wellhead and x-mas trees for both land and offshore use. Drilling... subsea pipeline tie-in tool. 4 CAMERON MARINE DRILLING SYSTEM Cameron Iron is a one-responsibility company for many oil field related products. It has the capability to p r o ? duce a wide variety of finished oil field equipment from steel produced...

  16. Analysis of sub-surface towing of tendons and comparison of results using WINPOST and ORCAFLEX

    E-Print Network [OSTI]

    Mendon, Perdoor Mukthi

    2002-01-01T23:59:59.000Z

    dmpm or ~m Reheard tn Sbdh ~ Canvergenae: Mas Mht Msg. Or Mag. Of Neragarm Taienece Damphtg SRL Error SRL Change 30 0. 0001 1800 2000 tLOTO Speed (nua) Dhecthm (deg) 0. 00 0. 00 Stags DunNon Number (a) 0 9. 000 1 208dtO Tbne Slaps (s) hear... Outer 0. 00028 08100 Une Target Damping (% arhhmt): Axle( Sending Tomhn O. MOO 0. 0000 0. 0000 Nea Our(sac 2 (m): 0. 000 Water Densgy Varhdhrc Water Densh)r. Constant Density (isbn"3) 1. 02$ Seabed Type Flat Seabed Origin (m) Dhecgon Slaps...

  17. Understanding Forage Intake in Range Animals (Spanish)

    E-Print Network [OSTI]

    Lyons, Robert K.; Machen, Richard V.; Forbes, T. D. A.

    2001-09-10T23:59:59.000Z

    durante la noche. El pastoreo durante las horas calientes del d?a es un indicador de que el consumo de forraje est? restringido. Producci?n y Asignaci?n de Forraje La cantidad de forraje tambi?n afecta el con- sumo. Un criterio para explicar esto es la... determina incluyendo el tama?o del potrero, n?mero de ani- males y tama?o de los animales. La asignaci?n diaria de forraje, en lugar de la producci?n por si sola, es un indicador mas ?til de la influencia de la disponibilidad de forraje sobre el consumo. De...

  18. Trek Encore Issue 3

    E-Print Network [OSTI]

    1985-01-01T23:59:59.000Z

    . IIJil Mould try to do salethlng for hil,ll lusld "cCoy fral thl dlpths of thl brandy battll that had blln 1IIIng hil through th. Iv.nlng al It had Slln hil through so lany IVlningl oVlr th. palt '1Iks. Scotty had hll scotch, Chlkav hil vodka, and "c...Coy his brandy - thrll droMning lin clinging to a last rllnant of hopi in a Ilanlng less Morld. Spack Mas standing in front of thl food processor Maiting for his Iial. As far al "cCoy could till, hi only Mint through the lotionl- IXClpt for a Iiall...

  19. The equity of property tax assessments on residential property in Bryan and College Station, Texas

    E-Print Network [OSTI]

    Kelvey, William Granville

    1986-01-01T23:59:59.000Z

    Residential property type (single family detached, snltiplex, TH-C) Lot Size (square footage) Bedroans (actual number) Fence (yes or no) Fireplace (total number of) Garage Detached (number of stalls) Garage Attached (number of stalls) Car'port (double...THE ACUITY OF PROPERTY TAX ASSES~S ON RESIDENTIAL PROPERTY IN BRYAN AND COLLEGE STATION, TEXAS A Thesis by Submitted to the Graduate College of Texas A&M University in partial fuifi11ment of the requiranents for the degree of MAS~ OF SCIENCE...

  20. Transmutation of {sup 129}I Using an Accelerator-Driven System

    SciTech Connect (OSTI)

    Nishihara, Kenji; Takano, Hideki [Japan Atomic Energy Research Institute (Japan)

    2002-01-15T23:59:59.000Z

    A conceptual blanket design for {sup 129}I transmutation is proposed for an accelerator-driven system (ADS) that is designed to transmute minor actinides (MAs). In this ADS, 250 kg/yr of MA and 56 kg/yr of iodine are simultaneously transmuted, and they correspond to the quantities generated from {approx}10 units of existing light water reactors. Furthermore, an introduction scenario and the benefit of iodine transmutation are studied for future introduction of fast breeder reactors. It is shown that the transmutation of iodine benefits the concept of underground disposal.

  1. Overview of crop management strategy for greenhouse tomatoes with an emphasis on employee development

    E-Print Network [OSTI]

    Freeman, Christopher Neil

    1999-01-01T23:59:59.000Z

    ser frutas reventadas. Este fen6meno ocurre porque la parte interior de la fruta crece mas rapido que la piel del tomate, y la piel se quiebra. Ademas, el deshoje inicia la producci6n de mds frutas nuevas en la planta. Nota. la manera, de deshojar... primer, y la fruta segundo. Las navajas que usamos son muy filosas, ten cuidado de no cortar tus dedos, ni a la fruta, Por esta raz6n?debes mantener tus dedos arriba del filo, y detras del punto todo el tiempo, Ademas, hay que fijarse en donde est6...

  2. Milliarcsec-scale radio structure of a matched sample of Seyfert 1 and Seyfert 2 galaxies

    E-Print Network [OSTI]

    Lal, D V; Gabuzda, D C; Lal, Dharam Vir; Shastri, Prajval; Gabuzda, Denise C.

    2004-01-01T23:59:59.000Z

    We have obtained mas-scale resolution very long baseline interferometry (VLBI) images of a sample of Seyfert 1 and Seyfert 2 galaxies at 5 GHz (wavelength, $\\lambda$ = 6 cm). The Seyferts of the two types were chosen to be matched in several orientation-independent properties, primarily in order to rigorously test predictions of the unified scheme. We detected all the 15 objects that we observed. In this paper we describe the observations and data reduction procedures, and present the VLBI radio images as well as simultaneous Very Large Array images that we obtained for these 15 Seyferts.

  3. Milliarcsec-scale radio structure of a matched sample of Seyfert 1 and Seyfert 2 galaxies

    E-Print Network [OSTI]

    Dharam Vir Lal; Prajval Shastri; Denise C. Gabuzda

    2004-06-28T23:59:59.000Z

    We have obtained mas-scale resolution very long baseline interferometry (VLBI) images of a sample of Seyfert 1 and Seyfert 2 galaxies at 5 GHz (wavelength, $\\lambda$ = 6 cm). The Seyferts of the two types were chosen to be matched in several orientation-independent properties, primarily in order to rigorously test predictions of the unified scheme. We detected all the 15 objects that we observed. In this paper we describe the observations and data reduction procedures, and present the VLBI radio images as well as simultaneous Very Large Array images that we obtained for these 15 Seyferts.

  4. Estimation of Nitric and Nitrous Nitrogen in Soils

    E-Print Network [OSTI]

    Fraps, G. S. (George Stronach); Sterges, A. J.

    1931-01-01T23:59:59.000Z

    of these are satisfactory with some soils and unsatisfac- tory with others. Lipman and Sharp (7') stated that potash alum had a tendency to gi~e low results, mhile lime vieldecl more accurate results. 9 comparison was made between lime and potash alum, using soils from... cultures incubatecl for 28 days at 35" C. Some of these cultures had receiveci additions of ammonium sulpliate. The lime mas usecl in the modified method as clescribecl elsewhere in this paper. The alum was added as 40 cc. of a .5 per cent solution...

  5. A solid-state nuclear magnetic resonance study of the reactions of propene on HY zeolite

    E-Print Network [OSTI]

    Oshiro, Irene Sueko

    1988-01-01T23:59:59.000Z

    , and condensation. The main objective of this study was to determine the reaction mechanism (including the observation of intermediates) for propane adsorbed on HY zeolite. C enriched propene was adsorbed on HY zeolite at room temperature, and it was observed..., as denoted by arrows C CP/MAS spectrum of propene-2- C 13 adsorbed on HY zeolite at room temperature 10 The polymerization reaction proposed in reference 13 for the adsorption of propene on HY zeolite The Bloch decay pulse sequence in NMR experiments...

  6. El amor en la poesia de Ernesto Cardenal

    E-Print Network [OSTI]

    Lorenzo, Mary Cooley

    1995-01-01T23:59:59.000Z

    a los mas necesitadas por medio de su trabajo coma sacerdote cat61ico, con su participaci6n politica, con su trabajo en comunidades y con su poesia. El objetivo de Cardenal es escribir poesia accesible a todos los nicaragiIenses. Ernesto Cardenal.... Curs6 estudios de posgraduado en la Universidad de Columbia, Eueva York, donde fue influido por las ideas literarias de Ezra Pound. Posteriormente estudi6 en el monasterio trapense de Kentucky (donde conoci6 a Thomas Merton), en el seminario...

  7. La guerra del fin del mundo: historia e invencion en una novela historica

    E-Print Network [OSTI]

    Loeffler, Lisa Bowe

    1984-01-01T23:59:59.000Z

    eficazmente a sus propias obras ficticias, corno se especificara mas adelante, estos comentarios pueden servir de base para el estudio de su concepto del pepsi que desempena la realidad o la historia en una ~ I dl p I f d *I. * ~Ht obra de ficcion. Porque... invencion en la novels historica La importancia relative de la realidad hist6rica y la invencion artistica ha sido una de las cuestiones fundamentales en el estudio de las novelas hist6ricas, tanto corno de las novelas en general. Esta breve introducci6n...

  8. La mujer y el amor en El mismo mar de todos los veranos, de Esther Tusquets

    E-Print Network [OSTI]

    Reed, Linnette Fourquet

    1985-01-01T23:59:59.000Z

    sin inhibiciones de ningun tipo, es visto en multiples posibles vertientes desde una perspectiva puramente f~. El estudio de la trilogfa de Tusquets nos servira para poner de mani- fiesto la busqueda de nuevos valores y actitudes que se esta... nueva literatura. Es sin mas, una intelectual que nos advierte a traves de sus novelas los nuevos derroteros que estan tamando en Espana la mujer y la escritora. El capitulo segundo de este estudio trata de ~car a esta escritora que nos ocupa en el...

  9. Solid State Nuclear Magnetic Resonance Investigation of Polymer Backbone Dynamics in Poly(Ethylene Oxide) Based Lithium and Sodium Polyether-ester-sulfonate Ionomers

    SciTech Connect (OSTI)

    Roach, David J. [Penn State Univ., State College, PA (United States). Dept. of Chemistry; Dou, Shichen [Penn State Univ., State College, PA (United States). Dept. of Materials Science and Engineering; Colby, Ralph H. [Penn State Univ., State College, PA (United States). Dept. of Materials Science and Engineering; Mueller, Karl T. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Penn State Univ., State College, PA (United States). Dept. of Chemistry

    2013-05-21T23:59:59.000Z

    Polymer backbone dynamics of single ion conducting poly(ethylene oxide) (PEO)-based ionomer samples with low glass transition temperatures (Tg) have been investigated using solid-state nuclear magnetic resonance (NMR). Experiments detecting 13C with 1H decoupling under magic angle spinning (MAS) conditions identified the different components of the polymer backbone (PEO spacer and isophthalate groups) and their relative mobilities for a suite of lithium- and sodium-containing ionomer samples with varying cation contents. Variable temperature (203-373 K) 1H-13C cross-polarization MAS (CP-MAS) experiments also provided qualitative assessment of the differences in the motions of the polymer backbone components as a function of cation content and identity. Each of the main backbone components exhibit distinct motions, following the trends expected for motional characteristics based on earlier Quasi Elastic Neutron Scattering and 1H spin-lattice relaxation rate measurements. Previous 1H and 7Li spin-lattice relaxation measurements focused on both the polymer backbone and cation motion on the nanosecond timescale. The studies presented here assess the slower timescale motion of the polymer backbone allowing for a more comprehensive understanding of the polymer dynamics. The temperature dependences of 13C linewidths were used to both qualitatively and quantitatively examine the effects of cation content and identity on PEO spacer mobility. Variable contact time 1H-13C CP-MAS experiments were used to further assess the motions of the polymer backbone on the microsecond timescale. The motion of the PEO spacer, reported via the rate of magnetization transfer from 1H to 13C nuclei, becomes similar for T ? 1.1 Tg in all ionic samples, indicating that at similar elevated reduced temperatures the motions of the polymer backbones on the microsecond timescale become insensitive to ion interactions. These results present an improved picture, beyond those of previous findings, for the dependence of backbone dynamics on cation density (and here, cation identity as well) in these amorphous PEO-based ionomer systems.

  10. An economic analysis of the welfare crisis in Texas

    E-Print Network [OSTI]

    Ledbetter, Harry Laughlin

    1972-01-01T23:59:59.000Z

    : The caseload data is in the Department of Public Idlf '*~AIR, RI1 d, f 6 f'. ly. 1'6 medical expenditures are reported in the Department's Annual 1'~lf *d "S. y fNd'1A. '. . Rpd'? tures" May 28, 1971, Kerr-Mill mas enacted in fiscal 1962. " *Estimated... finance issues has been a great help to me on numerous occasions. I am very gzateful to Mr, Thomas M Keel, Director of the Legislative Budget Board, for without his encouragement and support this thesis would never have been completed. I can never...

  11. Extranjero en mi tierra (Stranger in My Homeland): Migrant Realities in Mexico's Riviera Maya

    E-Print Network [OSTI]

    Sandoval, Erika Manuela

    2009-06-15T23:59:59.000Z

    transit state for many Central Americans who use Mxico to cross into the United States, and a migrant sending state either to other regions of Mxico or the United States. Due to historical economic crises, natural disasters, and political turmoil... 2 Regina Moctezuma, Playa del Carmen, cuidad que ms crece. CNN Expansin, 4 May 2007 http://www.cnnexpansion.com/actualidad/2007/4/playa-del-carmen-ciudad-que-mas-crece (accessed on 14 March 2009). 3 Destacan atractivos de Quintana Roo en la...

  12. O Teatro Brasileiro na Dcada de Oitenta

    E-Print Network [OSTI]

    Albuquerque, Severino Joã o

    1992-04-01T23:59:59.000Z

    -foi apresentada com estrondoso xito no somente no Brasil mas tambm em vrios festivais internacionais de teatro e em turnes pela Europa e Amricas. Sob a direo meticulosa de Antunes Filho, o Grupo Macunama conseguiu liberar a energia da rapsdia de Mrio... dcada de oitenta explica-se, ao menos em parte, pelas experincias dos que foram mais de perto atingidos pela censura da ditadura. Com a liberalizao poltica, Boal voltou ao Brasil pela primeira vez em oito anos para dar palestras e dirigir...

  13. A Lightweight and Flexible Mobile Agent Platform Tailored to Management Applications

    E-Print Network [OSTI]

    Gavalas, Damianos

    2011-01-01T23:59:59.000Z

    Mobile Agents (MAs) represent a distributed computing technology that promises to address the scalability problems of centralized network management. A critical issue that will affect the wider adoption of MA paradigm in management applications is the development of MA Platforms (MAPs) expressly oriented to distributed management. However, most of available platforms impose considerable burden on network and system resources and also lack of essential functionality. In this paper, we discuss the design considerations and implementation details of a complete MAP research prototype that sufficiently addresses all the aforementioned issues. Our MAP has been implemented in Java and tailored for network and systems management applications.

  14. Exo-zodi modelling for the Large Binocular Telescope Interferometer

    E-Print Network [OSTI]

    Kennedy, Grant M.; Wyatt, Mark C.; Bailey, Vanessa; Bryden, Geoffrey; Danchi, William C.; Defrre, Denis; Haniff, Philip M.; Lebreton, Jrmy; Mennesson, Bertrand; Millan-Gabet, Rafael; Morales, Farisa; Pani?, Olja; Rieke, George H.; Roberge, Aki; Serabyn, Eugene; Shannon, Andrew; Skemer, Andrew J.; Stapelfeldt, Karl R.; Su, Katherine Y. L.; Weinberger, Alycia J.

    2015-01-01T23:59:59.000Z

    : interferometers zodiacal dust circumstellar matter 1. INTRODUCTION One of the major long-term goals of astronomy is to place the Solar System within a greater context, finding for exam- ple whether habitable planets like the Earth are typical, and whether... mirror (with a FWHM of about 280 mas). The computed null depth is the total flux density in the right panel divided by the stellar flux density. 0 2 4 6 8 10 ?/?null 0.0 0.2 0.4 0.6 0.8 1.0 1.2 T ra ns m is si on Projected transmission Transmission...

  15. Spectroscopic investigation of simulated low-level nuclear waste glass

    SciTech Connect (OSTI)

    Rong, Chaoying; Li, Hong; Hrma, P.R.; Cho, H.M. [Pacific Northwest National Lab., Richland, WA (United States)

    1996-12-31T23:59:59.000Z

    Borosilicate glasses with high sodium concentrations, formulated to simulate vitrified Hanford low-level wastes (LLW), were investigated by {sup 31}P magic angle spinning (MAS) nuclear magnetic resonance (NMR). Phase separation, glass homogeneity changes during remelting, and the form of phosphate in glass following product consistency tests (PCT) were also examined by NMR. The results show that a distinct orthophosphate phase not part of the glass network is present in the glass. The effect of glass composition on phosphate chemical environments in the glass is discussed.

  16. Los discursos sobre sexualidad en la obra de Alicia Gaspar de Alba

    E-Print Network [OSTI]

    Vivancos P?erez, Ricardo F

    2002-01-01T23:59:59.000Z

    Jeronimo de la ciudad de Mexico y su renuncia a la escritura en los ultimos anos de su vida. En cuanto a su toma del habito, lo fascinante de su decision radica en su reconocimiento por escrito de motivaciones mas alla de lo religioso. Estas se... corte y en la iglesia, motivados por su condicion de mujer, monja y escritora, pero tambien por sospechas en cuanto a su orientacion sexual. Ademas, previamente en la novela, la toma del habito no es tanto una decision motivada por su pasidn por el...

  17. Variable-temperature solid-state NMR studies of iron(II) and iron(III) complexes

    E-Print Network [OSTI]

    Shepard, Patricia Arlene

    1989-01-01T23:59:59.000Z

    the first communication reporting the use of C CP/MAS NMR to observe paramagnetic solids directly. Zust as shift reagents had been used in solution-state NMR, selected paramagnetic lanthanide acetates exhibited paramagnetic shifts in the solid state... of the Fe(III) chloride salt yields the w-oxo-bis[porphine- iron(III)] dimer where the two iron centers are bridged via an oxygen. The synthesis, characterization and crystal structure of the metallo-porphyrin dimer w-oxo-bis[tetra- phenylporphineiron...

  18. Thematic music as a structuring element in the drama of Lope de Vega

    E-Print Network [OSTI]

    Sifers, Ann Manville

    1985-01-01T23:59:59.000Z

    Lo e de Ve a, "crea Lope casi por si solo un canon de la comedia. ' Naris C. Garcia de Enterrfa is one critic who has investigated the presence end role of music in Lope's plays. In her study, "Funcion de la 'letra para canter' en las comedies de... Enterria have already investigated and found to be the ones which include "mas abundancia de letras para canter" (27). Although neither of these critics has included any drama which might fall into the category of opera, there are ample references...

  19. Grupo fundamental e espacos de recobrimento, ver~ao 2011, Lista 2 Professor: H. Bursztyn

    E-Print Network [OSTI]

    Bursztyn, Henrique

    caminhos a, b, c, d : I X dados por: a(s) = F(s, 0), b(s) = F(1, s), c(s) = F(0, s), d(s) = F(1, s que o grupo fundamental de um grupo topol´ogico ´e abeliano. Dica: dados la¸cos a, b : I G com ponto base 1 G, use o problema 1 para F(s, t) = m(a(s), b(t))... Problema 3: Mostre que s~ao equivalentes

  20. Subparsec-scale HI in the nucleus of NGC 4151

    E-Print Network [OSTI]

    C. G. Mundell; J. M. Wrobel; A. Pedlar; J. F. Gallimore

    2000-12-11T23:59:59.000Z

    We present sensitive, high-resolution 21-cm VLBA+VLA observations of the radio jet and nuclear HI absorption in NGC 4151. The 25-mas (1.6-pc) resolution continuum image reveals a highly collimated radio jet, underlying the discrete components seen previously with MERLIN and the VLA. Spatially and kinematically complex HI absorption is detected against the whole 3-pc extent of the continuum component predicted by Ulvestad et al. to contain the AGN. Instead, we suggest the component against which the absorption is detected is part of the eastern counterjet, ruling it out as the location for the AGN.

  1. Honeywell Modular Automation System Computer Software Documentation for the Magnesium Hydroxide Precipitation Process

    SciTech Connect (OSTI)

    STUBBS, A.M.

    2001-06-25T23:59:59.000Z

    The purpose of this Computer Software Document (CSWD) is to provide configuration control of the Honeywell Modular Automation System (MAS) in use at the Plutonium Finishing Plant (PFP) for the Magnesium Hydroxide Precipitation Process in Rm 230C/234-5Z. The magnesium hydroxide process control software Rev 0 is being updated to include control programming for a second hot plate. The process control programming was performed by the system administrator. Software testing for the additional hot plate was performed per PFP Job Control Work Package 2Z-00-1703. The software testing was verified by Quality Control to comply with OSD-Z-184-00044, Magnesium Hydroxide Precipitation Process.

  2. Parallel Hough Transform for image processing on a Mesh of Trees architecture

    E-Print Network [OSTI]

    Cao, Yang

    1993-01-01T23:59:59.000Z

    for the degree of MAS'I'KR OF SCIENCE Approved as to style and content by: Mi Lu (Chair of Committee) , , ( J, ' Norman C. Griswoltl (I1 b ) . . C' Wei Z ao (Member) Philip Noe (Member) l . D. P tton (Head of De s, rtmenl, ) December 1993 Major...(n ) parallel method in GAPP((. eometric Arithmetic 'The broadcast time is ignored in time analysis Parallel Processor) [10]. The systolic array for an improved Hough Transform which w as reported by Chuang et al. requires O(N + n) time [12]. An algorithm...

  3. 2H and 27Al Solid-State NMR Study of the Local Environments in Aldoped 2-Line Ferrihydrite, Goethite, and Lepidocrocite

    E-Print Network [OSTI]

    Kim, Jongsik; Ilott, Andrew J.; Middlemiss, Derek S.; Chernova, Natasha A.; Pinney, Nathan; Morgan, Dane; Grey, Clare P.

    2015-05-13T23:59:59.000Z

    -doped goethite. Two sets of samples were prepared, labeled sets A and B, which differ in the temperature used in their syntheses. Set A, 70 ?C synthesis: to synthesize a series of goethite with 0, 6, 13, and 27 mol % Al substitution (labeled GA0, GA6, GA13... significant fraction occupies the surface sites. The lower temperature synthesis of GB0 (48 vs. 70 C) may also promote more vacancy formation. Figure 12. 2H MAS NMR spectra of Al-doped goethite samples, (a) GA0, (b) GA13, and (c) GA27, acquired at 433 K...

  4. NanoPV Corporation | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer PlantMunhall, Pennsylvania: Energy ResourcesOcean EnergyEnergyNanceNanoMas Technologies

  5. NanoeXa | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer PlantMunhall, Pennsylvania: Energy ResourcesOcean EnergyEnergyNanceNanoMas

  6. Nanomaterials Discovery Corporation NDC | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer PlantMunhall, Pennsylvania: Energy ResourcesOcean EnergyEnergyNanceNanoMasNanomaterials

  7. Observations of the pulsation of the Cepheid l Car with the Sydney University Stellar Interferometer

    E-Print Network [OSTI]

    J. Davis; A. P. Jacob; J. G. Robertson; M. J. Ireland; J. R. North; W. J. Tango; P. G. Tuthill

    2008-12-28T23:59:59.000Z

    Observations of the southern Cepheid l Car to yield the mean angular diameter and angular pulsation amplitude have been made with the Sydney University Stellar Interferometer (SUSI) at a wavelength of 696 nm. The resulting mean limb-darkened angular diameter is 2.990+-0.017 mas (i.e. +-0.6 per cent) with a maximum-to-minimum amplitude of 0.560+-0.018 mas corresponding to 18.7+-0.6 per cent in the mean stellar diameter. Careful attention has been paid to uncertainties, including those in measurements, in the adopted calibrator angular diameters, in the projected values of visibility squared at zero baseline, and to systematic effects. No evidence was found for a circumstellar envelope at 696 nm. The interferometric results have been combined with radial displacements of the stellar atmosphere derived from selected radial velocity data taken from the literature to determine the distance and mean diameter of l Car. The distance is determined to be 525+-26 pc and the mean radius 169+-8R{solar). Comparison with published values for the distance and mean radius show excellent agreement, particularly when a common scaling factor from observed radial velocity to pulsation velocity of the stellar atmosphere (the p-factor) is used.

  8. Radio Continuum Observations of the Galactic Center: Photoevaporative Proplyd-like Objects near Sgr A*

    E-Print Network [OSTI]

    Yusef-Zadeh, F; Wardle, M; Cotton, W; Schdel, R; Royster, M J

    2015-01-01T23:59:59.000Z

    We present radio images within 30$''$ of Sgr A* based on recent VLA observations at 34 GHz with 7.8 microJy sensitivity and resolution $\\sim88\\times46$ milliarcseconds (mas). We report 44 partially resolved compact sources clustered in two regions in the E arm of ionized gas that orbits Sgr A*. These sources have size scales ranging between ~50 and 200 mas (400 to 1600 AUs), and a bow-shock appearance facing the direction of Sgr A*. Unlike the bow-shock sources previously identified in the near-IR but associated with massive stars, these 34 GHz sources do not appear to have near-IR counterparts at 3.8 $\\mu$m. We interpret these sources as a candidate population of photoevaporative protoplanetary disks (proplyds) that are associated with newly formed low mass stars with mass loss rates ~10^{-7} - 10^{-6} solar mass per year and are located at the edge of a molecular cloud outlined by ionized gas. The disks are externally illuminated by strong Lyman continuum radiation from the ~100 OB and WR massive stars dist...

  9. Structure of Sagittarius A* at 86 GHz using VLBI Closure Quantities

    E-Print Network [OSTI]

    S. S. Doeleman; Z. -Q. Shen; A. E. E. Rogers; G. C. Bower; M. C. H. Wright; J. -H. Zhao; D. C. Backer; J. W. Crowley; R. W. Freund; P. T. P. Ho; K. Y. Lo; D. P. Woody

    2001-02-13T23:59:59.000Z

    At radio wavelengths, images of the compact radio source Sagittarius A* (Sgr A*) in the Galactic Center are scatter broadened with a lambda^2 dependence due to an intervening ionized medium. We present VLBI observations of Sgr A* at 86 GHz using a six station array including the VLBA antennas at Pie Town, Fort Davis and Los Alamos, the 12m antenna at Kitt Peak and the millimeter arrays at Hat Creek and Owens Valley. To avoid systematic errors due to imperfect antenna calibration, the data were modeled using interferometric closure information. The data are best modeled by a circular Gaussian brightness distribution of FWHM 0.18 +- 0.02 mas. The data are also shown to be consistent with an elliptical model corresponding to the scattering of a point source. The source structure in the N-S direction, which is less well determined than in the E-W direction due to the limited N-S (u,v) coverage of the array, is constrained to be less than 0.27 mas by these measurements. These results are consistent with extrapolations of intrinsic structure estimates obtained with VLBI at 7mm wavelength assuming the intrinsic size of Sgr A* has a greater dependence than lambda^0.9 with wavelength.

  10. Asymmetric Surface Brightness Distribution of Altair Observed with the Navy Prototype Optical Interferometer

    E-Print Network [OSTI]

    Ohishi, N; Hutter, D J; Ohishi, Naoko; Nordgren, Tyler E.; Hutter, Donald J.

    2004-01-01T23:59:59.000Z

    An asymmetric surface brightness distribution of the rapidly rotating A7IV-V star, Altair, has been measured by the Navy Prototype Optical Interferometer (NPOI). The observations were recorded simultaneously using a triangle of three long baselines of 30m, 37m, and 64m, on 19 spectral channels, covering the wavelength range of 520nm to 850nm. The outstanding characteristics of these observations are (a) high resolution with the minimum fringe spacing of 1.7mas, easily resolving the 3-milliarcsecond (mas) stellar disk, and (b) the measurement of closure phase which is a sensitive indicator to the asymmetry of the brightness distribution of the source. Uniform disk diameters fit to the measured squared visibility amplitudes confirms the Altair's oblate shape due to its rapid rotation. The measured observables of Altair showed two features which are inconsistent with both the uniform-disk and limb-darkened disk models, while the measured observable of the comparison star, Vega, are consistent with the limb-darke...

  11. Validation of Minor Actinide Cross Sections by Studying Samples Irradiated for 492 Days at the Dounreay Prototype Fast Reactor - II: Burnup Calculations

    SciTech Connect (OSTI)

    Tsujimoto, K. [Japan Atomic Energy Research Institute (Japan); Kohno, N. [Japan Atomic Energy Research Institute (Japan); Shinohara, N. [Japan Atomic Energy Research Institute (Japan); Sakurai, T. [Japan Atomic Energy Research Institute (Japan); Nakahara, Y. [Japan Atomic Energy Research Institute (Japan); Mukaiyama, T. [Japan Atomic Energy Research Institute (Japan); Raman, S. [Oak Ridge National Laboratory (United States)

    2003-06-15T23:59:59.000Z

    To evaluate neutron cross-section data of minor actinides (MAs), separated actinide samples and dosimetry samples were irradiated at the Dounreay Prototype Fast Reactor for 492 effective full-power days. Irradiated samples were analyzed both at Oak Ridge National Laboratory and at Japan Atomic Energy Research Institute (JAERI). This independent duplication has resulted in the generation of reliable radiochemical analysis data. Based on the burnup calculations of major actinide ({sup 235}U and {sup 239}Pu) and dosimetry samples, the neutron flux distribution and the flux level were adjusted at the locations where MA samples were irradiated. The burnup calculations were carried out for MAs using the determined flux distribution and flux level. The calculated results were compared with the experimental data. A brief description of sample preparation and irradiation and a detailed discussion of radiochemical analysis at JAERI are given in a companion paper. The current paper discusses the burnup calculations and the validation of MA cross-section data in evaluated nuclear data libraries.

  12. Composition, Mineralogy, and Porosity of Multiple Asteroid Systems from Visible and Near-infrared Spectral Data

    E-Print Network [OSTI]

    Lindsay, Sean S; Emery, Joshua P; Enriquez, J Emilio; Assafin, Marcelo

    2014-01-01T23:59:59.000Z

    We provide a taxonomic and compositional characterization of Multiple Asteroid Systems (MASs) located in the main belt (MB) using visible and near-infrared (0.45-2.5 um) spectral data of 42 MB MASs. The mineralogical analysis is applied to determine meteorite analogs for the MASs, which, in turn, are applied to the MAS density measurements of Marchis et al. (2012) to estimate the system porosity. The macroporosities are used to evaluate the primary MAS formation hypotheses. The visible observing campaign includes 25 MASs obtained using the SOAR telescope with the Goodman High Throughput Spectrometer. The infrared observing campaign includes 34 MASs obtained using the NASA IRTF with the SpeX spectragraph. The MASs are classified using the Bus-DeMeo taxonomic system. We perform a NIR spectral band parameter analysis using a new analysis routine, the Spectral Analysis Routine for Asteroids (SARA). The SARA routine determines band centers, areas, and depths by utilizing the diagnostic absorption features near 1- ...

  13. Compact Radio Sources within 30" of Sgr A*: Proper Motions, Stellar Winds and the Accretion Rate onto Sgr A*

    E-Print Network [OSTI]

    Yusef-Zadeh, F; Schdel, R; Wardle, M; Cotton, W; Roberts, D A; Nogueras-Lara, F; Gallego-Cano, E

    2015-01-01T23:59:59.000Z

    Recent broad-band 34 and 44 GHz radio continuum observations of the Galactic center have revealed 41 massive stars identified with near-IR counterparts, as well as 44 proplyd candidates within 30" of Sgr A*. Radio observations obtained in 2011 and 2014 have been used to derive proper motions of eight young stars near Sgr A*. The accuracy of proper motion estimates based on near-IR observations by Lu et al. and Paumard et al. have been investigated by using their proper motions to predict the 2014 epoch positions of near-IR stars and comparing the predicted positions with those of radio counterparts in the 2014 radio observations. Predicted positions from Lu et al. show an rms scatter of 6 mas relative to the radio positions, while those from Paumard et al. show rms residuals of 20 mas, which is mainly due to uncertainties in the IR-based proper motions. Under the assumption of homogeneous ionized winds, we also determine the mass-loss rates of 11 radio stars, finding rates that are on average $\\sim$2 times sm...

  14. Kinematic Study of the Blazar S5 0716+714

    E-Print Network [OSTI]

    U. Bach; T. P. Krichbaum; E. Ros; S. Britzen; W. W. Tian; A. Kraus; A. Witzel; J. A. Zensus

    2005-01-11T23:59:59.000Z

    We present the results of a multi-frequency study of the structural evolution of the VLBI jet in the BL Lac object 0716+714 over the last 10 years. We show VLBI images obtained at 5 GHz, 8.4 GHz, 15 GHz and 22 GHz. The milliarcsecond source structure is best described by a one-sided core-dominated jet of ~10 mas length. Embedded jet components move superluminally with speeds ranging from 5 c to 16 c (assuming z=0.3). Such fast superluminal motion is not typical for BL Lac objects, however it is still in the range of jet speeds typically observed in quasars (10 c to 20 c). In 0716+714, younger components, that were ejected more recently, seem to move systematically slower than the older components. This and a systematic position angle variation of the inner (1 mas) portion of the VLBI jet, suggests an at least partly geometric origin of the observed velocity variations. The observed rapid motion and the derived Lorentz factors are discussed with regard to the rapid Intra-Day Variability (IDV) and the gamma-ray observations, from which very high Doppler factors are inferred.

  15. High-precision astrometry with VVV. I. An independent reduction pipeline for VIRCAM@VISTA

    E-Print Network [OSTI]

    Libralato, M; Bedin, L R; Anderson, J; Piotto, G; Nascimbeni, V; Platais, I; Minniti, D; Zoccali, M

    2015-01-01T23:59:59.000Z

    We present a new reduction pipeline for the VIRCAM@VISTA detector and describe the method developed to obtain high-precision astrometry with the VISTA Variables in the V\\'ia L\\'actea (VVV) data set. We derive an accurate geometric-distortion correction using as calibration field the globular cluster NGC 5139, and showed that we are able to reach a relative astrometric precision of about 8 mas per coordinate per exposure for well-measured stars over a field of view of more than 1 square degree. This geometric-distortion correction is made available to the community. As a test bed, we chose a field centered around the globular cluster NGC 6656 from the VVV archive and computed proper motions for the stars within. With 45 epochs spread over four years, we show that we are able to achieve a precision of 1.4 mas/yr and to isolate each population observed in the field (cluster, Bulge and Disk) using proper motions. We used proper-motion-selected field stars to measure the motion difference between Galactic disk and...

  16. ON THE CONNECTION OF THE APPARENT PROPER MOTION AND THE VLBI STRUCTURE OF COMPACT RADIO SOURCES

    SciTech Connect (OSTI)

    Moor, A.; Frey, S. [FOeMI Satellite Geodetic Observatory, P.O. Box 585, H-1592 Budapest (Hungary); Lambert, S. B. [Observatoire de Paris, Departement Systemes de Reference Temps Espace (SYRTE), CNRS/UMR8630, 75014 Paris (France); Titov, O. A. [Geoscience Australia, P.O. Box 378, Canberra 2601 (Australia); Bakos, J., E-mail: moor@konkoly.hu, E-mail: frey@sgo.fomi.hu, E-mail: sebastien.lambert@obspm.fr, E-mail: oleg.titov@ga.gov.au, E-mail: jbakos@iac.es [Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife (Spain)

    2011-06-15T23:59:59.000Z

    Many of the compact extragalactic radio sources that are used as fiducial points to define the celestial reference frame are known to have proper motions detectable with long-term geodetic/astrometric very long baseline interferometry (VLBI) measurements. These changes can be as high as several hundred microarcseconds per year for certain objects. When imaged with VLBI at milliarcsecond (mas) angular resolution, these sources (radio-loud active galactic nuclei) typically show structures dominated by a compact, often unresolved 'core' and a one-sided 'jet'. The positional instability of compact radio sources is believed to be connected with changes in their brightness distribution structure. For the first time, we test this assumption in a statistical sense on a large sample rather than on only individual objects. We investigate a sample of 62 radio sources for which reliable long-term time series of astrometric positions as well as detailed 8 GHz VLBI brightness distribution models are available. We compare the characteristic direction of their extended jet structure and the direction of their apparent proper motion. We present our data and analysis method, and conclude that there is indeed a correlation between the two characteristic directions. However, there are cases where the {approx}1-10 mas scale VLBI jet directions are significantly misaligned with respect to the apparent proper motion direction.

  17. THE DISCOVERY OF HOST GALAXY H I ABSORPTION IN CTA 21

    SciTech Connect (OSTI)

    Salter, C. J.; Minchin, R.; Ghosh, T. [Arecibo Observatory, NAIC, HC3 Box 53995, Arecibo, Puerto Rico, PR 00612 (Puerto Rico); Saikia, D. J.; Chandola, Y. [National Centre for Radio Astrophysics, TIFR, Post Bag 3, Pune 411 007 (India)

    2010-06-01T23:59:59.000Z

    We report the discovery of H I 21 cm absorption toward the well-studied Gigahertz peaked spectrum source CTA 21 (4C 16.09) using the Arecibo telescope on 2009 September 20 and 21. Recently, the frequency band between 700 and 800 MHz was temporarily opened up to radio astronomy when US TV stations were mandated to switch from analog to digital transmissions, with new frequency allocations. The redshifted H I frequency for CTA 21 falls within this band. CTA 21 has a complex radio structure on a range of scales. The innermost prominent components are separated by {approx}12 mas while weak diffuse emission extends for up to {approx}300 mas. The H I absorption profile that we find has two main components, one narrow and the other wider and blueshifted. The total H I column density is 7.9 x 10{sup 20} cm{sup -2}, assuming a covering factor of unity and a spin temperature of 100 K. This H I absorption confirms the recently determined optical redshift of this faint galaxy of z {approx} 0.907. We discuss this new detection in light of H I absorption studies toward compact radio sources, and also the possibility that CTA 21 may be exhibiting multiple cycles of nuclear activity. This new detection in CTA 21 is consistent with a strong trend for detection of H I absorption in radio galaxies with evidence of episodic nuclear/jet activity.

  18. Connection between inner jet kinematics and broadband flux variability in the BL Lac object S5 0716+714

    E-Print Network [OSTI]

    Rani, B; Marscher, A P; Hodgson, J A; Fuhrmann, L; Angelakis, E; Britzen, S; Zensus, J A

    2015-01-01T23:59:59.000Z

    We present a high-frequency very long baseline interferometry (VLBI) kinematical study of the BL Lac object S5 0716+714 over the time period of September 2008 to October 2010. The aim of the study is to investigate the relation of the jet kinematics to the observed broadband flux variability. We find significant non-radial motions in the jet outflow of the source. In the radial direction, the highest measured apparent speed is \\sim37 c, which is exceptionally high, especially for a BL Lac object. Patterns in the jet flow reveal a roughly stationary feature \\sim0.15 mas downstream of the core. The long-term fits to the component trajectories reveal acceleration in the sub-mas region of the jet. The measured brightness temperature, T_{B}, follows a continuous trend of decline with distance, T_B \\propto r_{jet}^{-(2.36\\pm0.41)}, which suggests a gradient in Doppler factor along the jet axis. Our analysis suggest that a moving disturbance (or a shock wave) from the base of the jet produces the high-energy (optica...

  19. SPACE VELOCITIES OF SOUTHERN GLOBULAR CLUSTERS. VII. NGC 6397, NGC 6626 (M28), AND NGC 6656 (M22)

    SciTech Connect (OSTI)

    Casetti-Dinescu, Dana I.; Girard, Terrence M.; Van Altena, William F. [Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States); Jilkova, Lucie [Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotlarska 2, CZ-61137 Brno (Czech Republic); Podesta, Federico; Lopez, Carlos E., E-mail: dana.casetti@yale.edu, E-mail: terry.girard@yale.edu, E-mail: william.vanaltena@yale.edu, E-mail: jilkoval@physics.muni.cz [Universidad National de San Juan, Observatorio Astronomico ''Felix Aguilar'' and Yale Southern Observatory, Chimbas, 5413 San Juan (Argentina)

    2013-08-01T23:59:59.000Z

    We have measured the absolute proper motions of globular clusters NGC 6397, NGC 6626 (M22), and NGC 6656 (M28) as part of our ongoing Southern Proper-Motion Program. The reference system is the ICRS via Hipparcos stars for these three low-Galactic-latitude clusters. Formal errors range between {approx}0.3 and 0.7 mas yr{sup -1}. Notable is the result for NGC 6397, which differs by 2.5 mas yr{sup -1} from two Hubble Space Telescope determinations while agreeing with previous ground-based ones. We determine orbits for all three clusters in an axisymmetric and barred model of the Galaxy and discuss these in the context of globular-cluster formation. M22 is a well-known cluster with an iron abundance spread; such clusters are now believed to have formed in massive parent systems that can retain ejecta of core-collapsed supernovae. We find that the five currently accepted globular clusters with iron/calcium abundance spread show orbits unrelated to each other, thus suggesting at least five independent, massive progenitors that have contributed to the build-up of the Milky-Way halo.

  20. A radio-map of the colliding winds in the very massive binary system HD 93129A

    E-Print Network [OSTI]

    Benaglia, Paula; Moldon, Javier; Nelan, Ed; De Becker, Michael; Dougherty, Sean M; Koribalski, Baerbel

    2015-01-01T23:59:59.000Z

    Radio observations are an effective tool to discover particle acceleration regions in colliding-wind binaries, through detection of synchrotron radiation; these regions are natural laboratories for the study of relativistic particles. Wind-collision region (WCR) models can reproduce the radio continuum spectra of massive binaries that contain both thermal and non-thermal radio emission; however, key constraints for models come from high-resolution imaging. Only five WCRs have been resolved to date at radio frequencies at milliarcsec (mas) angular scales. The source HD 93129A, prototype of the very few known O2 I stars, is a promising target for study: recently, a second massive, early-type star about 50 mas away was discovered, and a non-thermal radio source detected in the region. Preliminary long-baseline array data suggest that a significant fraction of the radio emission from the system comes from a putative WCR. We sought evidence that HD 93129A is a massive binary system with colliding stellar winds tha...

  1. Clay Minerals

    SciTech Connect (OSTI)

    Mueller, Karl T.; Sanders, Rebecca L.; Washton, Nancy M.

    2014-03-14T23:59:59.000Z

    Clay minerals are important components of the environment and are involved or implicated in processes such as the uptake of pollutants and the release of nutrients and as potential platforms for a number of chemical reactions. Owing to their small particle sizes (typically, on the order of microns or smaller) and mixing with a variety of other minerals and soil components, advanced characterization methods are needed to study their structures, dynamics, and reactivities. In this article, we describe the use of solid-state NMR methods to characterize the structures and chemistries of clay minerals. Early one-pulse magic-angle spinning (MAS) NMR studies of 27Al and 29Si have now been enhanced and extended with new studies utilizing advanced methodologies (such as Multiple Quantum MAS) as well as studies of less-sensitive nuclei. In additional work, the issue of reactivity of clay minerals has been addressed, including studies of reactive surface area in the environment. Utilizations of NMR-sensitive nuclides within the clay minerals themselves, and in molecules that react with speci?c sites on the clay mineral surfaces, have aided in understanding the reactivity of these complex aluminosilicate systems.

  2. VLBI observations of two single dMe stars spatial resolution and astrometry

    E-Print Network [OSTI]

    Pestalozzi, M R; Conway, J E; Gdel, M

    2000-01-01T23:59:59.000Z

    We report on 3.6 cm VLA and VLBA observations of YZ CMi and AD Leo, two nearby dMe stars. We resolve YZ CMi and can fit a circular symmetrical gaussian component of FWHP of 0.98 +/-0.2 mas, corresponding to an extent of the corona above the photosphere of 1.77 x 10^{10} +/-8.8 x 10^{9} cm or 0.7 +/-0.3 Rstar (Rstar refers to the photospheric radius). We obtain an estimate of the brightness temperature of 7.3 x 10^{7} K, which is consistent with that expected from gyrosynchrotron emission. For AD Leo the emitting region is unresolved. We therefore set a conservative upper limit to its diameter of 1.8 times the photosphere diameter, which leads to an extent of the corona above the photosphere of CMi has been found to differ by 32 mas from the positions calculated from the Hipparcos...

  3. The diameter and evolutionary state of Procyon A

    E-Print Network [OSTI]

    Kervella, P; Morel, P; Berthomieu, G; Bord, P J; Provost, J P

    2003-01-01T23:59:59.000Z

    We report the angular diameter measurement obtained with the VINCI/VLTI instrument on the nearby star Procyon A (alpha CMi A, F5IV-V), at a relative precision of +/- 0.9%. We obtain a uniform disk angular diameter in the K band of UD = 5.376 +/- 0.047 mas and a limb darkened value of LD = 5.448 +/- 0.053 mas. Together with the Hipparcos parallax, this gives a linear diameter of 2.048 +/- 0.025 D_sun. We use this result in combination with spectroscopic, photometric and asteroseismic constraints to model this star with the CESAM code. One set of modeling parameters that reproduces the observations within their error bars are an age of 2314 Myr, an initial helium mass fraction Y_i = 0.301 and an initial mass ratio of heavy elements to hydrogen Z/X_i = 0.0314. We also computed the adiabatic oscillation spectrum of our model of Procyon A, giving a mean large frequency separation of Delta nu_0 = 54.7 microHz. This value is in agreement with the seismic observations by Martic et al. (1999, 2001). The interferometri...

  4. VLBI observations of two single dMe stars: spatial resolution and astrometry

    E-Print Network [OSTI]

    M. R. Pestalozzi; A. O. Benz; J. E. Conway; M. Guedel

    1999-12-08T23:59:59.000Z

    We report on 3.6 cm VLA and VLBA observations of YZ CMi and AD Leo, two nearby dMe stars. We resolve YZ CMi and can fit a circular symmetrical gaussian component of FWHP of 0.98 +/-0.2 mas, corresponding to an extent of the corona above the photosphere of 1.77 x 10^{10} +/-8.8 x 10^{9} cm or 0.7 +/-0.3 Rstar (Rstar refers to the photospheric radius). We obtain an estimate of the brightness temperature of 7.3 x 10^{7} K, which is consistent with that expected from gyrosynchrotron emission. For AD Leo the emitting region is unresolved. We therefore set a conservative upper limit to its diameter of 1.8 times the photosphere diameter, which leads to an extent of the corona above the photosphere of CMi has been found to differ by 32 mas from the positions calculated from the Hipparcos catalogue. The discrepancy is caused by large errors in the listed proper motion. An improved value is given.

  5. The diameter and evolutionary state of Procyon A

    E-Print Network [OSTI]

    P. Kervella; F. Thevenin; P. Morel; G. Berthomieu; P. Borde; J. Provost

    2003-09-04T23:59:59.000Z

    We report the angular diameter measurement obtained with the VINCI/VLTI instrument on the nearby star Procyon A (alpha CMi A, F5IV-V), at a relative precision of +/- 0.9%. We obtain a uniform disk angular diameter in the K band of UD = 5.376 +/- 0.047 mas and a limb darkened value of LD = 5.448 +/- 0.053 mas. Together with the Hipparcos parallax, this gives a linear diameter of 2.048 +/- 0.025 D_sun. We use this result in combination with spectroscopic, photometric and asteroseismic constraints to model this star with the CESAM code. One set of modeling parameters that reproduces the observations within their error bars are an age of 2314 Myr, an initial helium mass fraction Y_i = 0.301 and an initial mass ratio of heavy elements to hydrogen Z/X_i = 0.0314. We also computed the adiabatic oscillation spectrum of our model of Procyon A, giving a mean large frequency separation of Delta nu_0 = 54.7 microHz. This value is in agreement with the seismic observations by Martic et al. (1999, 2001). The interferometric diameter and the asteroseismic large frequency spacing together suggest a mass closer to 1.4 M_sun than to 1.5 M_sun. We conclude that Procyon is currently ending its life on the main sequence, as its luminosity class indicates.

  6. Courtship behavior of different wild strains of Ceratitis Capitata (Diptera: Tephritidae)

    SciTech Connect (OSTI)

    Briceno, D. [Escuela de Biologia, Universidad de Costa Rica, Ciudad Universitaria (Costa Rica); Eberhard, W. [Escuela de Biologia, Universidad de Costa Rica, Ciudad Universitaria and Smithsonian Tropical Research Institute (Costa Rica); Vilardi, J. [Dpto. de Ciencias Biologicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires (Argentina); Cayol, J.-P. [Technical Cooperation Division, IAEA, Wagramerstrasse 5, P.O. Box 100 A-1400, Vienna (Austria); Shelly, T. [A. C. , D. , E. USDA/APHIS/CPHST, 41-650 Ahiki St. Waimanalo, HI 96795 (United States)

    2007-03-15T23:59:59.000Z

    This study documents differences in the courtship behavior of wild strains of Ceratitis capitata (Wiedemann) from Madeira (Portugal), Hawaii (U.S.A.), Costa Rica, and Patagonia (Argentina). Some traits showed large variations and others substantial overlaps. The angle at which the male faced toward the female at the moment of transition from continuous wing vibration and intermittent buzzing changed very little during the course of courtship in all strains, but males from Madeira tended to face more directly toward the female than other males. Females tended to look more, and more directly, toward the males as courtship progressed in all strains. The distance between male and female tended to decrease as courtship proceeded in all strains, but the distances at which males initiated continuous vibration, intermittent buzzing, and jumped onto the female were relatively less variable between strains, except for the strain from Costa Rica. Flies of Madeira courted for longer and the male moved his head and buzzed his wings longer than the other strains. (author) [Spanish] Este estudio documenta diferencias en el comportamiento de cortejo de cepas silvestres de Ceratitis capitata (Wied.) provenientes de Madeira (Portugal), Hawaii (Estados Unidos de Norte America), Costa Rica y Patagonia (Argentina). Algunas caracteristicas mostraron grandes variaciones y traslape substancial. Los angulos a los cuales los machos miraron hacia las hembras cambiaron muy poco en el momento de la transicion de la vibracion continua al zumbido intermitente durante el curso del cortejo en todo las cepas, pero los machos de Madeira tendieron a enfrentar mas directamente a la hembra que otros machos. Los angulos de las hembras disminuyeron claramente durante el cortejo en todas las cepas. La distancia entre el macho y la hembra tendio a disminuir conforme el cortejo continuaba en todas las cepas, pero las distancias a las cuales los machos iniciaron la vibracion continua, el zumbido intermitente, y el salto sobre la hembra eran relativamente menos variables entre cepas excepto la cepa de Costa Rica. Moscas de Madeira cortejaron mas tiempo y el macho moviosu cabeza y zumbaba sus alas mas prolongadamente que las otras cepas. (author)

  7. Problema. 6 puntos. Cada pregunta vale 1.67 puntos excepto la c) que vale 1 punto.

    E-Print Network [OSTI]

    10.0.0.0/24 10.0.2.0/24 10.0.1.0/24 e1 e0 e0 e1 e2 ppp1 ppp0 e0 e1 e2 e0 e0 e0 e1 R2 Rout R1 R3 R4 10.0.1.2 10.0.2.1 10.0.2.40 10.0.0.70 10.0.1.1 10.0.0.1 ppp0 147.83.35.10 Est2Est1 PC1 PC2 Ser1 web e0 R1 + e0 de R3 2 14 red 5 0 ppp0 de R1 + ppp1 de Rout 2 4 Red 1 es la que mas @IPs necesita 28. La

  8. First Parallax Measurements Towards a 6.7 GHz Methanol Maser with the Australian Long Baseline Array - Distance to G339.884-1.259

    E-Print Network [OSTI]

    Krishnan, V; Reid, M J; Brunthaler, A; Sanna, A; McCallum, J; Reynolds, C; Bignall, H E; Phillips, C J; Dodson, R; Rioja, M; Caswell, J L; Chen, X; Dawson, J R; Fujisawa, K; Goedhart, S; Green, J A; Hachisuka, K; Honma, M; Menten, K; Shen, Z Q; Voronkov, M A; Walsh, A J; Xu, Y; Zhang, B; Zheng, X W

    2015-01-01T23:59:59.000Z

    We have conducted the first parallax and proper motion measurements of 6.7 GHz methanol maser emission using the Australian Long Baseline Array (LBA). The parallax of G339.884$-$1.259 measured from five epochs of observations is 0.48$\\pm $0.08 mas, corresponding to a distance of $2.1^{+0.4}_{-0.3}$ kpc, placing it in the Scutum spiral arm. This is consistent (within the combined uncertainty) with the kinematic distance estimate for this source at 2.5$\\pm $0.5 kpc using the latest Solar and Galactic rotation parameters. We find from the Lyman continuum photon flux that the embedded core of the young star is of spectral type B1, demonstrating that luminous 6.7 GHz methanol masers can be associated with high-mass stars towards the lower end of the mass range.

  9. Structural study of VO {sub x} doped aluminium fluoride and aluminium oxide catalysts

    SciTech Connect (OSTI)

    Scheurell, Kerstin [Institute of Chemistry, Humboldt University of Berlin, Brook-Taylor-Street 2, Berlin D-12489 (Germany); Scholz, Gudrun [Institute of Chemistry, Humboldt University of Berlin, Brook-Taylor-Street 2, Berlin D-12489 (Germany); Kemnitz, Erhard [Institute of Chemistry, Humboldt University of Berlin, Brook-Taylor-Street 2, Berlin D-12489 (Germany)], E-mail: erhard.kemnitz@chemie.hu-berlin.de

    2007-02-15T23:59:59.000Z

    The structural properties of vanadium doped aluminium oxyfluorides and aluminium oxides, prepared by a modified sol-gel synthesis route, were thoroughly investigated. The influence of the preparation technique and the calcination temperature on the coordination of vanadium, aluminium and fluorine was analysed by different spectroscopic methods such as Raman, MAS NMR and ESR spectroscopy. In all samples calcined at low temperatures (350 deg. C), vanadium coexists in two oxidation states V{sup IV} and V{sup V}, with V{sup IV} as dominating species in the vanadium doped aluminium oxyfluorides. In the fluoride containing solids aluminium as well as vanadium are coordinated by fluorine and oxygen. Thermal annealing of 800 deg. C leads to an extensive reorganisation of the original matrices and to the oxidation of V{sup IV} to V{sup V} in both systems. - Graphical abstract: Structure model for VO {sub x} doped aluminium oxide.

  10. Prospects of cold dark matter searches with an ultra-low-energy germanium detector

    E-Print Network [OSTI]

    H. T. Wong

    2007-11-08T23:59:59.000Z

    The report describes the research program on the development of ultra-low-energy germanium detectors, with emphasis on WIMP dark matter searches. A threshold of 100 eV is achieved with a 20 g detector array, providing a unique probe to the low-mas WIMP. Present data at a surface laboratory is expected to give rise to comparable sensitivities with the existing limits at the $\\rm{5 - 10 GeV}$ WIMP-mass range. The projected parameter space to be probed with a full-scale, kilogram mass-range experiment is presented. Such a detector would also allow the studies of neutrino-nucleus coherent scattering and neutrino magnetic moments.

  11. Cataclysmic variables in the SUPERBLINK proper motion survey

    SciTech Connect (OSTI)

    Skinner, Julie N.; Thorstensen, John R. [Department of Physics and Astronomy, 6127 Wilder Laboratory, Dartmouth College, Hanover, NH 03755-3528 (United States); Lpine, Sbastien, E-mail: jns@dartmouth.edu [Department of Physics and Astronomy, Georgia State University, 25 Park Place NE, Atlanta, GA 30303 (United States)

    2014-12-01T23:59:59.000Z

    We have discovered a new high proper motion cataclysmic variable (CV) in the SUPERBLINK proper motion survey, which is sensitive to stars with proper motions greater than 40 mas yr{sup ?1}. This CV was selected for follow-up observations as part of a larger search for CVs selected based on proper motions and their near-UV?V and V?K{sub s} colors. We present spectroscopic observations from the 2.4 m Hiltner Telescope at MDM Observatory. The new CV's orbital period is near 96 minutes, its spectrum shows the double-peaked Balmer emission lines characteristic of quiescent dwarf novae, and its V magnitude is near 18.2. Additionally, we present a full list of known CVs in the SUPERBLINK catalog.

  12. H-gallosilicate (MFI) propane aromatization catalyst: Influence of Si/Ga ratio on acidity, activity and deactivation due to coking

    SciTech Connect (OSTI)

    Choudhary, V.R.; Kinage, A.K.; Sivadinarayana, C. [National Chemical Lab., Pune (India)] [and others] [National Chemical Lab., Pune (India); and others

    1996-01-01T23:59:59.000Z

    Influence of bulk Si/Ga ratio of H-gallosilicate (MFI) on its degalliation (during calcination for removal of template and deammoniation of NH{sub 4} form), acidity/acid strength distribution (measured by stepwise thermal desorption and chemisorption of pyridine at 50-400{degrees}C using GC techniques and also by acid catalyzed model reactions viz. iso-octane cracking and toluene disproportionation) and initial activity/product selectivity and catalyst deactivation in propane aromatization (at 550{degrees}C) has been investigated. Framework Si/Ga ratio was measured by {sup 29}Si MAS NMR. Information on the external acid sites is obtained by isooctane cracking. The influence of poisoning of strong acid sites (by pyridine) on acid catalyzed model reactions and the effect of deactivation on the product distribution in the propane aromatization have also been studied. 21 refs., 19 figs., 3 tabs.

  13. Conceptual design of minor actinides burner with an accelerator-driven subcritical system.

    SciTech Connect (OSTI)

    Cao, Y.; Gohar, Y. (Nuclear Engineering Division)

    2011-11-04T23:59:59.000Z

    In the environmental impact study of the Yucca Mountain nuclear waste repository, the limit of spent nuclear fuel (SNF) for disposal is assessed at 70,000 metric tons of heavy metal (MTHM), among which 63,000 MTHM are the projected SNF discharge from U.S. commercial nuclear power plants though 2011. Within the 70,000 MTHM of SNF in storage, approximately 115 tons would be minor actinides (MAs) and 585 tons would be plutonium. This study describes the conceptual design of an accelerator-driven subcritical (ADS) system intended to utilize (burn) the 115 tons of MAs. The ADS system consists of a subcritical fission blanket where the MAs fuel will be burned, a spallation neutron source to drive the fission blanket, and a radiation shield to reduce the radiation dose to an acceptable level. The spallation neutrons are generated from the interaction of a 1 GeV proton beam with a lead-bismuth eutectic (LBE) or liquid lead target. In this concept, the fission blanket consists of a liquid mobile fuel and the fuel carrier can be LBE, liquid lead, or molten salt. The actinide fuel materials are dissolved, mixed, or suspended in the liquid fuel carrier. Therefore, fresh fuel can be fed into the fission blanket to adjust its reactivity and to control system power during operation. Monte Carlo analyses were performed to determine the overall parameters of an ADS system utilizing LBE as an example. Steady-state Monte Carlo simulations were studied for three fission blanket configurations that are similar except that the loaded amount of actinide fuel in the LBE is either 5, 7, or 10% of the total volume of the blanket, respectively. The neutron multiplication factor values of the three configurations are all approximately 0.98 and the MA initial inventories are each approximately 10 tons. Monte Carlo burnup simulations using the MCB5 code were performed to analyze the performance of the three conceptual ADS systems. Preliminary burnup analysis shows that all three conceptual ADS systems consume about 1.2 tons of actinides per year and produce 3 GW thermal power, with a proton beam power of 25 MW. Total MA fuel that would be consumed in the first 10 years of operation is 9.85, 11.80, or 12.68 tons, respectively, for the systems with 5, 7, or 10% actinide fuel particles loaded in the LBE. The corresponding annual MA fuel transmutation rate after reaching equilibrium at 10 years of operation is 0.83, 0.94, or 1.02 tons/year, respectively. Assuming that the ADS systems can be operated for 35 full-power years, the total MAs consumed in the three ADS systems are 30.6, 35.3, and 37.2 tons, respectively. For the three configurations, it is estimated that 3.8, 3.3, or 3.1 ADS system units are required to utilize the entire 115 tons of MA fuel in the SNF inventory, respectively.

  14. Demineralization of petroleum cokes and fly ash samples obtained from the upgrading of Athabasca oil sands bitumen

    SciTech Connect (OSTI)

    Majid, A.; Ratcliffe, C.I.; Ripmeester, J.A. (National Research Council of Canada, Ottawa, ON (Canada). Div. of Chemistry)

    1989-01-01T23:59:59.000Z

    Ash reduction of the cokes and fly ash samples derived from the Athabasca oil sands bitumen was attempted by dissolving the mineral matter in acids. The samples used for this investigation included Syncrude fluid coking coke, Suncor delayed coking coke and the two fly ash samples obtained from the combustion of these cokes. All samples were analyzed for C,H,N,O, and S before and after acid demineralization and the analyses results compared. Further, the ash from the samples before and after acid demineralization was analyzed for silica, alumina, iron titanium, nickel and vanadium to assess the acid leaching of these elements. CP/MAS, /sup 13/C NMR spectroscopic study of the demineralized coke and fly ash samples was also attempted.

  15. Trigonometric Parallaxes of Central Stars of Planetary Nebulae

    E-Print Network [OSTI]

    Hugh C. Harris; Conard C. Dahn; Blaise Canzian; Harry H. Guetter; S. K. Leggett; Stephen E. Levine; Christian B. Luginbuhl; Alice K. B. Monet; David G. Monet; Jeffrey R. Pier; Ronald C. Stone; Trudy Tilleman; Frederick J. Vrba; Richard L. Walker

    2006-11-16T23:59:59.000Z

    Trigonometric parallaxes of 16 nearby planetary nebulae are presented, including reduced errors for seven objects with previous initial results and results for six new objects. The median error in the parallax is 0.42 mas, and twelve nebulae have parallax errors less than 20 percent. The parallax for PHL932 is found here to be smaller than was measured by Hipparcos, and this peculiar object is discussed. Comparisons are made with other distance estimates. The distances determined from these parallaxes tend to be intermediate between some short distance estimates and other long estimates; they are somewhat smaller than estimated from spectra of the central stars. Proper motions and tangential velocities are presented. No astrometric perturbations from unresolved close companions are detected.

  16. FEASIBILITY OF RECYCLING PLUTONIUM AND MINOR ACTINIDES IN LIGHT WATER REACTORS USING HYDRIDE FUEL

    SciTech Connect (OSTI)

    Greenspan, Ehud; Todreas, Neil; Taiwo, Temitope

    2009-03-10T23:59:59.000Z

    The objective of this DOE NERI program sponsored project was to assess the feasibility of improving the plutonium (Pu) and minor actinide (MA) recycling capabilities of pressurized water reactors (PWRs) by using hydride instead of oxide fuels. There are four general parts to this assessment: 1) Identifying promising hydride fuel assembly designs for recycling Pu and MAs in PWRs 2) Performing a comprehensive systems analysis that compares the fuel cycle characteristics of Pu and MA recycling in PWRs using the promising hydride fuel assembly designs identified in Part 1 versus using oxide fuel assembly designs 3) Conducting a safety analysis to assess the likelihood of licensing hydride fuel assembly designs 4) Assessing the compatibility of hydride fuel with cladding materials and water under typical PWR operating conditions Hydride fuel was found to offer promising transmutation characteristics and is recommended for further examination as a possible preferred option for recycling plutonium in PWRs.

  17. A universal electromagnetic energy conversion adapter based on a metamaterial absorber

    E-Print Network [OSTI]

    Xie, Yunsong; Wilson, Jeffrey D; Simons, Rainee N; Chen, Yunpeng; Xiao, John Q

    2013-01-01T23:59:59.000Z

    On the heels of metamaterial absorbers (MAs) which produce near perfect electromagnetic (EM) absorption and emission, we propose a universal electromagnetic energy conversion adapter (UEECA) based on MA. By choosing the appropriate energy converting sensors, the UEECA is able to achieve near 100% signal transfer ratio between EM energy and various forms of energy such as thermal, DC electric, or higher harmonic EM energy. The inherited subwavelength dimension and the EM field intensity enhancement can further empower UEECA in many critical applications such as energy harvesting, solar cell, and nonlinear optics. The principle of UEECA is understood with a transmission line model, which further provides a design strategy that can incorporate a variety of energy conversion devices. The concept is experimentally validated at a microwave frequency with a signal transfer ratio of 96% by choosing an RF diode as the energy converting sensor.

  18. A dual emission mechanism in Sgr A*/L' ?

    E-Print Network [OSTI]

    Yann Clnet; Daniel Rouan; Damien Gratadour; Olivier Marco; Pierre Lna; Nancy Ageorges; Eric Gendron

    2005-07-05T23:59:59.000Z

    We have collected in 2004 adaptive optics corrected L' images of the Galactic Center region with NAOS-CONICA at VLT. A strong variability was observed as well as a correlation between the photocenter positions and fluxes of the L'-band counterpart of Sgr A*. It is interpreted as the combined emission of a point-like flaring source at the position of Sgr A*/IR itself and an extended dust structure, 75 mas south west of Sgr A*/IR, which we name Sgr A*-f. We examine the different possible mechanisms to explain this dual Sgr A* L' emission and conclude it is likely a flaring emission associated to energetic events in the close environment of the black hole plus a quiescent emission resulting from the collision of Sgr A*-f by a jet from Sgr A*.

  19. Aging Studies of Filled and Unfilled VCE

    SciTech Connect (OSTI)

    Letant, S; Herberg, J; Alviso, C; Small, W; Mulcahy, H; Pearson, M; Wilson, T; Chinn, S; Maxwell, R

    2009-11-10T23:59:59.000Z

    This report presents data on the effects of temperature and gamma radiation on the chemical and structural properties of both filled and unfilled VCE material produced by the Kansas City Plant using WR-qualified processes. Thermal effects up to 300 C and gamma irradiation doses of 1 MRad and 25 MRad were investigated under atmospheric conditions. Characterization techniques used in the study comprise Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Tensile Testing, Solid Phase MicroExtraction - Gas Chromatography/Mass Spectrometry (SPME-GC/MS), phenol extraction followed by HPLC, and various Nuclear Magnetic Resonance (NMR) techniques including: {sup 13}C, {sup 13}C {l_brace}{sup 1}H{r_brace} cross polarization (CP), {sup 1}H magic angle spinning (MAS), 13C{l_brace}{sup 1}H{r_brace} Wide-line-Separation (2D-WISE) and development of Center band-Only Detection of Exchange (CODEX).

  20. Astrometry of the stellar image of U Her amplified by the circumstellar 22 GHz water masers

    E-Print Network [OSTI]

    W. H. T. Vlemmings; H. J. van Langevelde; P. J. Diamond

    2002-08-09T23:59:59.000Z

    The 22 GHz H_2O masers in the circumstellar envelope of the Mira variable star U Her have been observed with MERLIN using a phase referencing technique to determine accurate astrometric positions. The positions were compared with the optical positions obtained with the Hipparcos satellite to an accuracy of 18 mas. The absolute radio position of the brightest H_2O maser spot is found to match the optical position, indicating that this spot is the stellar image amplified by the maser screen in front of it. The occurrence of an amplified image in the 22 GHz maser can be used to accurately determine the positions of the H_2O with respect to the star as well as with respect to the SiO and OH masers. Our observations seem to indicate that the star is not in the centre of the distribution of maser spots, which has been interpreted as a ring.

  1. FIRST GROUND-BASED CHARGE-COUPLED DEVICE PROPER MOTIONS FOR FORNAX. II. FINAL RESULTS

    SciTech Connect (OSTI)

    Mendez, Rene A.; Costa, Edgardo [Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile); Gallart, Carme [Instituto de Astrofisica de Canarias, Tenerife 38200, Islas Canarias (Spain); Pedreros, Mario H. [Departamento de Fisica, Universidad de Tarapaca, Casilla 7-D, Arica (Chile); Moyano, Maximiliano [Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Altmann, Martin, E-mail: rmendez@das.uchile.cl, E-mail: costa@das.uchile.cl, E-mail: carme@iac.es, E-mail: mpedrero@uta.cl, E-mail: moyano@mpia-hd.mpg.de, E-mail: maltmann@ari.uni-heidelberg.de [Zentrum fuer Astronomie, Moenchhofstr. 12-14, 69120 Heidelberg (Germany)

    2011-09-15T23:59:59.000Z

    We present the first entirely ground-based astrometric determination of the proper motion for the Fornax Local Group dwarf spheroidal satellite galaxy of the Milky Way (MW), using charge-coupled device data acquired with the ESO 3.5 m New Technology Telescope at La Silla Observatory in Chile. Our unweighted mean from five quasar fields in the background of Fornax, used as fiducial reference points, leads to {mu}{sub {alpha}c}os {delta} = 0.62 {+-} 0.16 mas yr{sup -1} and {mu}{sub {delta}} = -0.53 {+-} 0.15 mas yr{sup -1}. A detailed comparison with all previous measurements of this quantity seems to imply that there is still no convincing convergence to a single value, perhaps indicating the existence of unaccounted systematic effects in (some of) these measurements. From all available proper-motion and radial velocity measurements for Fornax, we compute Fornax's orbital parameters and their uncertainty using a realistic Galactic potential and a Monte Carlo simulation. Properties of the derived orbits are then compared to main star formation episodes in the history of Fornax. All published proper-motion values imply that Fornax has recently (200-300 Myr ago) approached perigalacticon at a distance of {approx}150 kpc. However, the derived period exhibits a large scatter, as does the apogalacticon. Our orbit, being the most energetic, implies a very large apogalactic distance of {approx}950 kpc. If this were the case, then Fornax would be a representative of a hypervelocity MW satellite in late infall.

  2. High-Resolution NMR of Quadrupolar Nuclei in the Solid State

    SciTech Connect (OSTI)

    Gann, Sheryl Lee

    1995-11-30T23:59:59.000Z

    This dissertation describes recent developments in solid state nuclear magnetic resonance (NMR), for the most part involving the use of dynamic-angle spinning (DAS) NMR to study quadrupolar nuclei. Chapter 1 introduces some of the basic concepts and theory that will be referred to in later chapters, such as the density operator, product operators, rotations, coherence transfer pathways, phase cycling, and the various nuclear spin interactions, including the quadrupolar interaction. Chapter 2 describes the theory behind motional averaging experiments, including DAS, which is a technique where a sample is spun sequentially about two axis oriented at different angles with respect to the external magnetic field such that the chemical shift and quadrupolar anisotropy are averaged to zero. Work done on various rubidium-87 salts is presented as a demonstration of DAS. Chapter 3 explains how to remove sidebands from DAS and magic-angle spinning (MAS) experiments, which result from the time-dependence of the Hamiltonian under sample spinning conditions, using rotor-synchronized {pi}-pulses. Data from these experiments, known as DAH-180 and MAH-180, respectively, are presented for both rubidium and lead salts. In addition, the applicability of this technique to double rotation (DOR) experiments is discussed. Chapter 4 concerns the addition of cross-polarization to DAS (CPDAS). The theory behind spin locking and cross polarizing quadrupolar nuclei is explained and a method of avoiding the resulting problems by performing cross polarization at 0{sup o} (parallel) with respect to the magnetic field is presented. Experimental results are shown for a sodium-23 compound, sodium pyruvate, and for oxygen-17 labeled L-akmine. In Chapter 5, a method for broadening the Hartmann-Hahn matching condition under MAS, called variable effective field cross-polarization (VEFCI?), is presented, along with experimental work on adamantane and polycarbonate.

  3. Synthesis of mesoporous zeolite single crystals with cheap porogens

    SciTech Connect (OSTI)

    Tao Haixiang; Li Changlin; Ren Jiawen [Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237 (China); Wang Yanqin, E-mail: wangyanqin@ecust.edu.cn [Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237 (China); Lu Guanzhong, E-mail: gzhlu@ecust.edu.cn [Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237 (China)

    2011-07-15T23:59:59.000Z

    Mesoporous zeolite (silicalite-1, ZSM-5, TS-1) single crystals have been successfully synthesized by adding soluble starch or sodium carboxymethyl cellulose (CMC) to a conventional zeolite synthesis system. The obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen sorption analysis, {sup 27}Al magic angle spinning nuclear magnetic resonance ({sup 27}Al MAS NMR), temperature-programmed desorption of ammonia (NH{sub 3}-TPD) and ultraviolet-visible spectroscopy (UV-vis). The SEM images clearly show that all zeolite crystals possess the similar morphology with particle size of about 300 nm, the TEM images reveal that irregular intracrystal pores are randomly distributed in the whole crystal. {sup 27}Al MAS NMR spectra indicate that nearly all of the Al atoms are in tetrahedral co-ordination in ZSM-5, UV-vis spectra confirm that nearly all of titanium atoms are incorporated into the framework of TS-1. The catalytic activity of meso-ZSM-5 in acetalization of cyclohexanone and meso-TS-1 in hydroxylation of phenol was also studied. The synthesis method reported in this paper is cost-effective and environmental friendly, can be easily expended to prepare other hierarchical structured zeolites. - Graphical abstract: Mesoporous zeolite single crystals were synthesized by using cheap porogens as template. Highlights: > Mesoporous zeolite (silicalite-1, ZSM-5, TS-1) single crystals were synthesized. > Soluble starch or sodium carboxymethyl cellulose (CMC) was used as porogens. > The mesoporous zeolites had connected mesopores although closed pores existed. > Higher catalytic activities were obtained.

  4. Orbital motions as gradiometers for post-Newtonian tidal effects

    E-Print Network [OSTI]

    Lorenzo Iorio

    2014-07-31T23:59:59.000Z

    The direct long-term changes occurring in the orbital dynamics of a local gravitationally bound binary system $S$ due to the post-Newtonian tidal acceleration caused by an external massive source are investigated. A class of systems made of a test particle $m$ rapidly orbiting with orbital frequency $n_{\\rm b}$ an astronomical body of mass $M$ which, in turn, slowly revolves around a distant object of mass $M^{'}$ with orbital frequency $n_{\\rm b}^{'}\\ll n_{\\rm b}$ is considered. The characteristic frequencies of the non-Keplerian orbital variations of $m$ and of $M$ itself are assumed to be negligible with respect to both $n_{\\rm b}$ and $n_{\\rm b}^{'}$. General expressions for the resulting Newtonian and post-Newtonian tidal orbital shifts of $m$ are obtained. The future missions BepiColombo and JUICE to Mercury and Ganymede, respectively, are considered in view of a possible detection. The largest effects, of the order of $\\approx 0.1-0.5$ milliarcseconds per year (mas yr$^{-1}$), occur for the Ganymede orbiter of the JUICE mission. Although future improvements in spacecraft tracking and orbit determination might, perhaps, reach the required sensitivity, the systematic bias represented by the other known orbital perturbations of both Newtonian and post-Newtonian origin would be overwhelming. The realization of a dedicated artificial mini-planetary system to be carried onboard and Earth-orbiting spacecraft is considered as well. Post-Newtonian tidal precessions as large as $\\approx 1-10^2$ mas yr$^{-1}$ could be obtained, but the quite larger Newtonian tidal effects would be a major source of systematic bias because of the present-day percent uncertainty in the product of the Earth's mass times the Newtonian gravitational parameter.

  5. High angular resolution N-band observation of the silicate carbon star IRAS08002-3803 with the VLTI/MIDI instrument

    E-Print Network [OSTI]

    Keiichi Ohnaka; T. Driebe; K. -H. Hofmann; Ch. Leinert; S. Morel; F. Paresce; Th. Preibisch; A. Richichi; D. Schertl; M. Schoeller; L. B. F. M. Waters; G. Weigelt; M. Wittkowski

    2005-09-26T23:59:59.000Z

    We present the results of N-band spectro-interferometric observations of the silicate carbon star IRAS08002-3803 with the MID-infrared Interferometric instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) of the European Southern Observatory (ESO). The observations were carried out using two unit telescopes (UT2 and UT3) with projected baseline lengths ranging from 39 to 47 m. Our observations of IRAS08002-3803 have spatially resolved the dusty environment of a silicate carbon star for the first time and revealed an unexpected wavelength dependence of the angular size in the N band: the uniform-disk diameter is found to be constant and ~36 mas (72 Rstar) between 8 and 10 micron, while it steeply increases longward of 10 micron to reach ~53 mas (106 Rstar) at 13 micron. Model calculations with our Monte Carlo radiative transfer code show that neither spherical shell models nor axisymmetric disk models consisting of silicate grains alone can simultaneously explain the observed wavelength dependence of the visibility and the spectral energy distribution (SED). We propose that the circumstellar environment of IRAS08002-3803 may consist of two grain species coexisting in the disk: silicate and a second grain species, for which we consider amorphous carbon, large silicate grains, and metallic iron grains. Comparison of the observed visibilities and SED with our models shows that such disk models can fairly -- though not entirely satisfactorily -- reproduce the observed SED and N-band visibilities. Our MIDI observations and the radiative transfer calculations lend support to the picture where oxygen-rich material around IRAS08002-3803 is stored in a circumbinary disk surrounding the carbon-rich primary star and its putative low-luminosity companion.

  6. Asymmetric silicate dust distribution toward the silicate carbon star BM Gem

    E-Print Network [OSTI]

    Keiichi Ohnaka; Hideyuki Izumiura; Christoph Leinert; Thomas Driebe; Gerd Weigelt; Markus Wittkowski

    2008-07-21T23:59:59.000Z

    Silicate carbon stars show the 10 micron silicate emission, despite their carbon-rich photospheres. They are considered to have circumbinary or circum-companion disks, which serve as a reservoir of oxygen-rich material shed by mass loss in the past. We present N-band spectro-interferometric observations of the silicate carbon star BM Gem using MIDI at the Very Large Telescope Interferometer (VLTI). Our aim is to probe the spatial distribution of oxygen-rich dust with high spatial resolution. BM Gem was observed with VLTI/MIDI at 44--62 m baselines using the UT2-UT3 and UT3-UT4 baseline configurations. The N-band visibilities observed for BM Gem show a steep decrease from 8 to ~10 micron and a gradual increase longward of ~10 micron, reflecting the optically thin silicate emission feature emanating from sub-micron-sized amorphous silicate grains. The differential phases obtained at baselines of ~44--46 m show significant non-zero values (~ -70 degrees) in the central part of the silicate emission feature between ~9 and 11 micron, revealing a photocenter shift and the asymmetric nature of the silicate emitting region. The observed N-band visibilities and differential phases can be fairly explained by a simple geometrical model in which the unresolved star is surrounded by a ring with azimuthal brightness modulation. The best-fit model is characterized by a broad ring (~70 mas across at 10 micron) with a bright region which is offset from the unresolved star by ~20 mas at a position angle of ~280 degrees. This model can be interpreted as a system with a circum-companion disk and is consistent with the spectroscopic signatures of an accretion disk around an unseen companion recently discovered in the violet spectrum of BM Gem.

  7. Host Plants of Xylosandrus mutilatus in Mississippi

    SciTech Connect (OSTI)

    Stone, W.D.; Nebeker, T.E. [Department of Entomology and Plant Pathology, Mississippi State University, Box 9775, Mississippi State, MS 39762 (United States); Gerard, P.D. [Experimental Statistics Unit, Mississippi State University, Box 9731, Mississippi State, MS 39762 (United States)

    2007-03-15T23:59:59.000Z

    Host range of Xylosandrus mutilatus (Blandford) in North America is reported here for the first time. Descriptive data such as number of attacks per host, size of stems at point of attacks, and height of attacks above ground are presented. Hosts observed in Mississippi were Acer rubrum L., Acer saccharum Marsh., Acer palmatum Thunb., Ostrya virginiana (Mill.) K. Koch., Cornus florida L., Fagus grandifolia Ehrh., Liquidamber styraciflua L., Carya spp., Liriodendron tulipifera L., Melia azedarach L., Pinus taeda L., Prunus serotina Ehrh., Prunus americana Marsh., Ulmus alata Michaux, and Vitus rotundifolia Michaux. Liquidamber styraciflua had significantly more successful attacks, significantly higher probability of attacks, and significantly higher number of adult beetles per host tree than did Carya spp., A. rubrum, and L. tulipifera. This information is relevant in determining the impact this exotic beetle may have in nurseries, urban areas, and other forestry systems where this beetle becomes established. (author) [Spanish] El rango de hospederos de Xylosandrus mutilatus (Blandford) en America del Norte esta reportado aqui por la primera vez. Se presentan datos descriptivos como el numero de ataques por hospederos, el tamano de los tallos en el punto de ataque y la altura por encima del nivel de tierra de los ataques. Los hospederos observados en el estado de Mississippi fueron Acer rubrum L., Acer saccharum Marsh., Acer palmatum Thunb., Ostrya virginiana (Mill.) K. Koch., Cornus florida L., Fagus grandifolia Ehrh., Liquidamber styraciflua L., Carya spp., Liriodendron tulipifera L., Melia azedarach L., Pinus taeda L., Prunus serotina Ehrh., Prunus americana Marsh., Ulmus alata Michaux y Vitus rotundifolia Michaux. Liquidamber styraciflua tuvo ataques significativamente mas exitosos, una probabilidad significativamente mas alta de ataques y un numero significativamente mayor de adultos de escarabajos por arbol hospedero que Carya spp., A. rubrum y L. tulipifera. Esta informacion es pertinente en determinar el impacto que pueda tener este escarabajo exotico en invernaderos, areas urbanas y otros sistemas forestales donde el escarabajo se establece. (author)

  8. Synthesis of acid-base bifunctional mesoporous materials by oxidation and thermolysis

    SciTech Connect (OSTI)

    Yu, Xiaofang [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China)] [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China); Zou, Yongcun [State Key Laboratory of Inoranic Synthesis and Preparative Chemistryg, College of Chemistry, Jilin University, Changchun 130012 (China)] [State Key Laboratory of Inoranic Synthesis and Preparative Chemistryg, College of Chemistry, Jilin University, Changchun 130012 (China); Wu, Shujie; Liu, Heng [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China)] [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China); Guan, Jingqi, E-mail: guanjq@jlu.edu.cn [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China)] [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China); Kan, Qiubin, E-mail: qkan@jlu.edu.cn [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China)] [College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023 (China)

    2011-06-15T23:59:59.000Z

    Graphical abstract: A novel and efficient method has been developed for the synthesis of acid-base bifunctional catalyst. The obtained sample of SO{sub 3}H-MCM-41-NH{sub 2} containing amine and sulfonic acids exhibits excellent catalytic activity in aldol condensation reaction. Research highlights: {yields} Synthesize acid-base bifunctional mesoporous materials SO{sub 3}H-MCM-41-NH{sub 2}. {yields} Oxidation and then thermolysis to generate acidic site and basic site. {yields} Exhibit good catalytic performance in aldol condensation reaction between acetone and various aldehydes. -- Abstract: A novel and efficient method has been developed for the synthesis of acid-base bifunctional catalyst SO{sub 3}H-MCM-41-NH{sub 2}. This method was achieved by co-condensation of tetraethylorthosilicate (TEOS), 3-mercaptopropyltrimethoxysilane (MPTMS) and (3-triethoxysilylpropyl) carbamicacid-1-methylcyclohexylester (3TAME) in the presence of cetyltrimethylammonium bromide (CTAB), followed by oxidation and then thermolysis to generate acidic site and basic site. X-ray diffraction (XRD) and transmission electron micrographs (TEM) show that the resultant materials keep mesoporous structure. Thermogravimetric analysis (TGA), X-ray photoelectron spectra (XPS), back titration, solid-state {sup 13}C CP/MAS NMR and solid-state {sup 29}Si MAS NMR confirm that the organosiloxanes were condensed as a part of the silica framework. The bifunctional sample (SO{sub 3}H-MCM-41-NH{sub 2}) containing amine and sulfonic acids exhibits excellent acid-basic properties, which make it possess high activity in aldol condensation reaction between acetone and various aldehydes.

  9. Synthesis, characterization and catalytic activity of acid-base bifunctional materials through protection of amino groups

    SciTech Connect (OSTI)

    Shao, Yanqiu [College of Chemistry, Jilin University, Changchun 130023 (China) [College of Chemistry, Jilin University, Changchun 130023 (China); College of Chemistry, Mudanjiang Normal University, Mudanjiang 157012 (China); Liu, Heng; Yu, Xiaofang [College of Chemistry, Jilin University, Changchun 130023 (China)] [College of Chemistry, Jilin University, Changchun 130023 (China); Guan, Jingqi, E-mail: guanjq@jlu.edu.cn [College of Chemistry, Jilin University, Changchun 130023 (China)] [College of Chemistry, Jilin University, Changchun 130023 (China); Kan, Qiubin, E-mail: qkan@mail.jlu.edu.cn [College of Chemistry, Jilin University, Changchun 130023 (China)] [College of Chemistry, Jilin University, Changchun 130023 (China)

    2012-03-15T23:59:59.000Z

    Graphical abstract: Acid-base bifunctional mesoporous material SO{sub 3}H-SBA-15-NH{sub 2} was successfully synthesized under low acidic medium through protection of amino groups. Highlights: Black-Right-Pointing-Pointer The acid-base bifunctional material SO{sub 3}H-SBA-15-NH{sub 2} was successfully synthesized through protection of amino groups. Black-Right-Pointing-Pointer The obtained bifunctional material was tested for aldol condensation. Black-Right-Pointing-Pointer The SO{sub 3}H-SBA-15-NH{sub 2} catalyst containing amine and sulfonic acid groups exhibited excellent acid-basic properties. -- Abstract: Acid-base bifunctional mesoporous material SO{sub 3}H-SBA-15-NH{sub 2} was successfully synthesized under low acidic medium through protection of amino groups. X-ray diffraction (XRD), N{sub 2} adsorption-desorption, transmission electron micrographs (TEM), back titration, {sup 13}C magic-angle spinning (MAS) NMR and {sup 29}Si magic-angle spinning (MAS) NMR were employed to characterize the synthesized materials. The obtained bifunctional material was tested for aldol condensation reaction between acetone and 4-nitrobenzaldehyde. Compared with monofunctional catalysts of SO{sub 3}H-SBA-15 and SBA-15-NH{sub 2}, the bifunctional sample of SO{sub 3}H-SBA-15-NH{sub 2} containing amine and sulfonic acid groups exhibited excellent acid-basic properties, which make it possess high activity for the aldol condensation.

  10. Solid-state Structural Characterization of a Rigid Framework of Lacunary Heteropolyniobates

    SciTech Connect (OSTI)

    Nyman,M.; Celestian, A.; Holland, G.; Alam, T.; Parise, J.

    2006-01-01T23:59:59.000Z

    In our ongoing investigations of heteropolyniobate chemistry, a phase featuring decorated, A-type trivacant {alpha}-Keggin ions linked by their charge-balancing sodium cations has been isolated and structurally characterized. This is the first heteropolyniobate reported that has a true lacunary structure type. Na{sub 15}[(PO{sub 2}){sub 3}PNb{sub 9}O{sub 34}]{center_dot}22H{sub 2}O (1) [triclinic space group P{bar 1} (No. 2); a = 12.242 (2) Angstroms, b = 12.291 (3) Angstroms, c = 22.056 (4) Angstroms; {alpha}= 93.12 (3), {beta}= 99.78 (3), {gamma}= 119.84 (3); Z = 4, V = 2799.2 (10) Angstroms{sup 3}] is composed of bilayers of the heteropolyanions alternating with layers of hydrated Na{sup +} cations. Sodium cations also bridge the clusters within their layers through Na-Ot-Nb, Na-Ob-Nb2, and Na-Ot-P bonds (t = terminal and b = bridging). This phase is poorly soluble in water, suggesting that it is more characteristic of a framework of linked heteropolyanions rather than a water-soluble heteropolyanion salt. Two-dimensional solid-state {sup 23}Na multiple-quantum magic angle spinning (MAS) NMR of 1 reveals five distinctive chemical and structural environments for sodium, which agrees with the crystallographic data. The {sup 23}Na and {sup 1}H MAS NMR studies further illustrate the rigid and immobile nature of this framework of cations and anions.

  11. SU-E-I-46: Sample-Size Dependence of Model Observers for Estimating Low-Contrast Detection Performance From CT Images

    SciTech Connect (OSTI)

    Reiser, I; Lu, Z [University of Chicago, Chicago, IL (United States)

    2014-06-01T23:59:59.000Z

    Purpose: Recently, task-based assessment of diagnostic CT systems has attracted much attention. Detection task performance can be estimated using human observers, or mathematical observer models. While most models are well established, considerable bias can be introduced when performance is estimated from a limited number of image samples. Thus, the purpose of this work was to assess the effect of sample size on bias and uncertainty of two channelized Hotelling observers and a template-matching observer. Methods: The image data used for this study consisted of 100 signal-present and 100 signal-absent regions-of-interest, which were extracted from CT slices. The experimental conditions included two signal sizes and five different x-ray beam current settings (mAs). Human observer performance for these images was determined in 2-alternative forced choice experiments. These data were provided by the Mayo clinic in Rochester, MN. Detection performance was estimated from three observer models, including channelized Hotelling observers (CHO) with Gabor or Laguerre-Gauss (LG) channels, and a template-matching observer (TM). Different sample sizes were generated by randomly selecting a subset of image pairs, (N=20,40,60,80). Observer performance was quantified as proportion of correct responses (PC). Bias was quantified as the relative difference of PC for 20 and 80 image pairs. Results: For n=100, all observer models predicted human performance across mAs and signal sizes. Bias was 23% for CHO (Gabor), 7% for CHO (LG), and 3% for TM. The relative standard deviation, ?(PC)/PC at N=20 was highest for the TM observer (11%) and lowest for the CHO (Gabor) observer (5%). Conclusion: In order to make image quality assessment feasible in the clinical practice, a statistically efficient observer model, that can predict performance from few samples, is needed. Our results identified two observer models that may be suited for this task.

  12. Nesting biology, morphological remarks, and description of the mature larva of Mellinus arvensis obscurus (Hymenoptera: Crabronidae) in Nepal

    SciTech Connect (OSTI)

    Boesi, R.; Polidori, C.; Andrietti, F. [Dipartimento di Biologia, Sezione di Zoologia e Citologia, Universita degli Studi di Milano-Via Celoria, 26, 20133, Milan (Italy); Gayubo, S.F.; Tormos, J.; Asis, J.D. [Unidad de Zoologia, Facultad de Biologia, Universidad de Salamanca-37071, Salamanca (Spain)

    2007-03-15T23:59:59.000Z

    Recently re-named as a sub-species of Mellinus arvensis, Mellinus arvensis obscurus Handlirsch 1888 was investigated ecologically and morphologically in Nepal, in order to underline the most important differences with the well known M. arvensis arvensis. Mellinus arvensis obscurus females nested in clumped aggregations on inclined plains at high altitudes, both on sunny bare soil and on a shaded grassy one. Beginning of monsoon season probably interfered with wasp activity, and females performed few provisioning flights during the day. Prey consisted of a broad range of Diptera, except for one case of a spider. Many females were observed not provisioning a nest but floating on the nesting site, and many intraspecific interactions suggested a high degree of usurpation attempts. At least one species of flies and two of ants probably acted as natural enemies of the wasp. Morphological observations on females showed that the Nepal population shares more similarities (shape of tergite I, body punctation) with the European populations than with the closer Japanese population; melanization is strong, according to west-east and altitudinal cline. The mature larva of M. arvensis obscurus Handlirsch is described, illustrated, and compared with the other mature larva of the genus. The differences between both larvae mainly lie in the presence/absence, and number or differentiation of integumental structures. We conclude that morphological traits are more important than ecological and behavioral ones in distinguishing M. arvensis obscurus from M. arvensis arvensis. (author) [Spanish] En el presente articulo se aportan los resultados y conclusiones de un estudio, llevado a cabo en Nepal, en el que se abordaron aspectos ecologicos, comportamentales y morfologicos (tanto del ultimo estado de la fase larvaria como del adulto) de Mellinus arvensis obscurus Handlirsch 1888. El principal objetivo del estudio radicaba en mostrar las principales diferencias que separan a esta subespecie de la bien estudiada subespecie nominal. Mellinus arvensis obscurus nidifica a gran altitud, en terreno inclinado, con y sin vegetacion, expuesto en mayor o menor medida al sol y en agregaciones muy compactas. Durante la estacion lluviosa la hembras llevan a cabo pocos vuelos de aprovisonamiento. Las presas pertenecen al orden de los dipteros, aunque, en una ocasion se observo el aporte de una arana. Gran numero de las interacciones intraespecificas observadas sugieren un alto grado de intentos de usurpacion de nidos. Los enemigos naturales mas sobresalientes pertenecen al orden de los dipteros y a la familia de los formicidos. Del estudio morfologico del adulto, mencionaremos que la foma del terguito 1 y la escultura del cuerpo, en las hembras de las poblaciones del Nepal, son mas semejantes a los de las hembras de las poblaciones europeas que no a los de las japonesas. De la fase larvaria se describe el ultimo estado larvario, a la vez que se compara con la otra larva madura ya descrita del genero. Las diferencias entre ambas larvas maduras radican en la presencia/ausencia, numero o diferenciacion de las estructuras tegumentarias. El estudio finaliza concluyendo que los rasgos morfologicos son mas importantes, que los aspectos ecologicos y comportamentales, a la hora de establecer una separacion entre las dos subespecies (author)

  13. Mechanochemical-thermal preparation and structural studies of mullite-type Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} solid solutions

    SciTech Connect (OSTI)

    Da Silva, K.L. [Institute of Physical and Theoretical Chemistry, Technische Universitaet Braunschweig, Hans-Sommer-Str. 10, 38106 Braunschweig (Germany); Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, 30167 Hannover (Germany); Department of Physics, State University of Maringa, Av. Colombo 5790, 87020-900 Maringa (Brazil); Sepelak, V., E-mail: vladimir.sepelak@kit.ed [Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); Duevel, A. [Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, 30167 Hannover (Germany); Paesano, A. [Department of Physics, State University of Maringa, Av. Colombo 5790, 87020-900 Maringa (Brazil); Hahn, H. [Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany); Litterst, F.J. [Institute of Condensed Matter Physics, Technische Universitaet Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig (Germany); Heitjans, P. [Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, 30167 Hannover (Germany); Becker, K.D. [Institute of Physical and Theoretical Chemistry, Technische Universitaet Braunschweig, Hans-Sommer-Str. 10, 38106 Braunschweig (Germany)

    2011-05-15T23:59:59.000Z

    A series of Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} solid solutions (0{<=}x{<=}1), prepared by mechanochemical processing of Bi{sub 2}O{sub 3}/Ga{sub 2}O{sub 3}/Al{sub 2}O{sub 3} mixtures and subsequent annealing, was investigated by XRD, EDX, and {sup 27}Al MAS NMR. The structure of the Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} solid solutions is found to be orthorhombic, space group Pbam (No. 55). The lattice parameters of the Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} series increase linearly with increasing gallium content. Rietveld refinement of the XRD data as well as the analysis of the {sup 27}Al MAS NMR spectra show a preference of gallium cations for the tetrahedral sites in Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9}. As a consequence, this leads to a far from random distribution of Al and Ga cations across the whole series of solid solutions. -- Graphical Abstract: Mullite-type Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} mixed crystals (0{<=}x{<=}1) prepared by a combined mechanochemical-thermal route possess a non-random distribution of Ga{sup 3+} and Al{sup 3+} cations over the sites of tetrahedral (T) and octahedral [O] coordination, characterized by the preference of Ga{sup 3+} (Al{sup 3+}) for tetrahedral (octahedral) sites. Display Omitted Highlights: {yields} Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} (0{<=}x{<=}1) were synthesized via mechanochemical-thermal route. {yields} The lattice parameters of Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} increase linearly with gallium content. {yields} Quantitative information on the cation distribution in Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} is derived. {yields} Ga{sup 3+} and Al{sup 3+} show the preference for tetrahedral and octahedral sites, respectively.

  14. PARALLAXES OF SOUTHERN EXTREMELY COOL OBJECTS. I. TARGETS, PROPER MOTIONS, AND FIRST RESULTS

    SciTech Connect (OSTI)

    Andrei, A. H.; Penna, J. L.; D'Avila, V. A.; Camargo, J. I. B. [Observatorio Nacional/MCT, R. Gal. Jose Cristino 77, CEP20921-400, RJ (Brazil); Smart, R. L.; Bucciarelli, B.; Crosta, M. T.; Dapra, M.; Lattanzi, M. G. [INAF/Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10025 Pino Torinese (Italy); Goldman, B. [Max Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg (Germany); Jones, H. R. A.; Pinfield, D. J. [Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom); Nicastro, L. [INAF/Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna, Via Gobetti 101, 40129 Bologna (Italy); Da Silva Neto, D. N. [Centro Universitario Estadual da Zona Oeste, Av. Manuel Caldeira de Alvarenga 1203, CEP23070-200, RJ (Brazil); Teixeira, R. [Universidade de Sao Paulo, Rua do Matao, 1226-Cidade Universitaria, 05508-900 Sao Paulo-SP (Brazil)

    2011-02-15T23:59:59.000Z

    We present results from the PARallaxes of Southern Extremely Cool objects (PARSEC) program, an observational program begun in 2007 April to determine parallaxes for 122 L and 28 T southern hemisphere dwarfs using the Wide Field Imager on the ESO 2.2 m telescope. The results presented here include parallaxes of 10 targets from observations over 18 months and a first version proper motion catalog. The proper motions were obtained by combining PARSEC observations astrometrically reduced with respect to the Second US Naval Observatory CCD Astrograph Catalog, and the Two Micron All Sky Survey Point Source Catalog. The resulting median proper motion precision is 5 mas yr{sup -1} for 195,700 sources. The 140 0.3 deg{sup 2} fields sample the southern hemisphere in an unbiased fashion with the exception of the galactic plane due to the small number of targets in that region. The proper motion distributions are shown to be statistically well behaved. External comparisons are also fully consistent. We will continue to update this catalog until the end of the program, and we plan to improve it including also observations from the GSC2.3 database. We present preliminary parallaxes with a 4.2 mas median precision for 10 brown dwarfs, two of which are within 10 pc. These increase the present number of L dwarfs by 20% with published parallaxes. Of the 10 targets, seven have been previously discussed in the literature: two were thought to be binary, but the PARSEC observations show them to be single; one has been confirmed as a binary companion and another has been found to be part of a binary system, both of which will make good benchmark systems. These results confirm that the foreseen precision of PARSEC can be achieved and that the large field of view will allow us to identify wide binary systems. Observations for the PARSEC program will end in early 2011 providing three to four years of coverage for all targets. The main expected outputs are: more than a 100% increase in the number of L dwarfs with parallaxes, increment in the number of objects per spectral subclass up to L9-in conjunction with published results-to at least 10, and to put sensible limits on the general binary fraction of brown dwarfs. We aim to contribute significantly to the understanding of the faint end of the H-R diagram and of the L/T transition region.

  15. Trigonometric Parallaxes for Two Late-Type Subdwarfs: LSR1425+71 (sdM8.0) and the Binary LSR1610-00 (sd?M6pec)

    E-Print Network [OSTI]

    C. C. Dahn; H. C. Harris; S. E. Levine; T. Tilleman; A. K. B. Monet; R. C. Stone; H. H. Guetter; B. Canzian; J. R. Pier; W. I. Hartkopf; J. Liebert; M. Cushing

    2008-06-13T23:59:59.000Z

    Trigonometric parallax astrometry and BVI photometry are presented for two late-type subdwarf candidates, LSR1425+71 (sdM8.0) and LSR1610-00 (sd?M6pec). For the former we measure an absolute parallax of 13.37+/-0.51 mas yielding Mv=15.25+/-0.09. The astrometry for LSR1610-00 shows that this object is an astrometric binary with a period of 1.66+/-0.01 yr. The photocentric orbit is derived from the data; it has a moderate eccentricity (e ~ 0.44+/-0.02) and a semi-major axis of 0.28+/-0.01 AU based on our measured absolute parallax of 31.02+/-0.26 mas. Our radial velocity measure of -108.1+/-1.6 km/s for LSR1610-00 at epoch 2006.179, when coupled with the observation of -95+/-1 km/s at epoch 2005.167 by Reiners & Basri, indicates a systemic radial velocity of -101+/-1 km/s for the LSR1610-00AB pair. The galactic velocity components for LSR1425+71 and LSR1610-00AB -- (U,V,W)=(84+/-6, -202+/-13, 66+/-14) km/s and (U,V,W)=(36+/-2, -232+/-2, -61+/-2) km/s, respectively. For both stars, the velocities are characteristic of halo population kinematics. However, modeling shows that both stars have orbits around the galaxy with high eccentricity that pass remarkably close to the galactic center. LSR1425+71 has a luminosity and colors consistent with its metal-poor subdwarf spectral classification, while LSR1610-00 has a luminosity and most colors indicative of being only mildly metal-poor, plus a uniquely red B-V color. The companion to LSR1610-00 must be a low-mass, substellar brown dwarf. We speculate on the paradoxical nature of LSR1610-00 and possible sources of its peculiarities.

  16. TESTING THE HYPOTHESIS THAT METHANOL MASER RINGS TRACE CIRCUMSTELLAR DISKS: HIGH-RESOLUTION NEAR-INFRARED AND MID-INFRARED IMAGING

    SciTech Connect (OSTI)

    De Buizer, James M. [Stratospheric Observatory for Infrared Astronomy-USRA, NASA Ames Research Center, MS N232-12, Moffett Field, CA 94035 (United States); Bartkiewicz, Anna; Szymczak, Marian, E-mail: jdebuizer@sofia.usra.edu [Torun Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, 87-100 Torun (Poland)

    2012-08-01T23:59:59.000Z

    Milliarcsecond very long baseline interferometry maps of regions containing 6.7 GHz methanol maser emission have lead to the recent discovery of ring-like distributions of maser spots and the plausible hypothesis that they may be tracing circumstellar disks around forming high-mass stars. We aimed to test this hypothesis by imaging these regions in the near- and mid-infrared at high spatial resolution and compare the observed emission to the expected infrared morphologies as inferred from the geometries of the maser rings. In the near-infrared we used the Gemini North adaptive optics system of ALTAIR/NIRI, while in the mid-infrared we used the combination of the Gemini South instrument T-ReCS and super-resolution techniques. Resultant images had a resolution of {approx}150 mas in both the near-infrared and mid-infrared. We discuss the expected distribution of circumstellar material around young and massive accreting (proto)stars and what infrared emission geometries would be expected for the different maser ring orientations under the assumption that the masers are coming from within circumstellar disks. Based upon the observed infrared emission geometries for the four targets in our sample and the results of spectral energy distribution modeling of the massive young stellar objects associated with the maser rings, we do not find compelling evidence in support of the hypothesis that methanol masers rings reside in circumstellar disks.

  17. Heating of the molecular gas in the massive outflow of the local ultraluminous-infrared and radio-loud galaxy 4C12.50

    E-Print Network [OSTI]

    Dasyra, K M; Novak, G S; Bremer, M; Spinoglio, L; Santaella, M Pereira; Salome, P; Falgarone, E

    2014-01-01T23:59:59.000Z

    We present a comparison of the molecular gas properties in the outflow vs. in the ambient medium of the local prototype radio-loud and ultraluminous-infrared galaxy 4C12.50 (IRAS13451+1232), using new data from the IRAM Plateau de Bure interferometer and 30m telescope, and the Herschel space telescope. Previous H_2 (0-0) S(1) and S(2) observations with the Spitzer space telescope had indicated that the warm (~400K) molecular gas in 4C12.50 is made up of a 1.4(+-0.2)x10^8 M_sun ambient reservoir and a 5.2(+-1.7)x10^7 M_sun outflow. The new CO(1-0) data cube indicates that the corresponding cold (25K) H_2 gas mass is 1.0(+-0.1)x10^10 M_sun for the ambient medium and = 30 times higher in the outflow than in the ambient medium, indicating that a non-negligible fraction of the accelerated gas is heated to temperatures at which star formation is inefficient. This conclusion is robust against the use of different alpha factor values, and/or different warm gas tracers (H_2 vs. H_2 plus CO): with the CO-probed gas mas...

  18. Structure of rhenium-containing sodium borosilicate glass

    SciTech Connect (OSTI)

    Goel, Ashutosh; McCloy, John S.; Windisch, Charles F.; Riley, Brian J.; Schweiger, Michael J.; Rodriguez, Carmen P.; Ferreira, Jose M.

    2013-03-01T23:59:59.000Z

    A series of sodium borosilicate glasses were synthesized with increasing fractions of KReO4 or Re2O7, to 10000 ppm (1 mass%) target Re in glass, to assess the effects of large concentrations of rhenium on glass structure and to estimate the solubility of technetium, a radioactive component in typical low active waste nuclear waste glasses. Magic angle spinning nuclear magnetic resonance (MAS-NMR), Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy were performed to characterize the glasses as a function of Re source additions. In general, silicon was found coordinated in a mixture of Q2 and Q3 structural units, while Al was 4-coordinated and B was largely 3-coordinate and partially 4-coordinated. The rhenium source did not appear to have significant effects on the glass structure. Thus, at the up to the concentrations that remain in dissolved in glass, ~3000 ppm Re by mass maximum. , the Re appeared to be neither a glass-former nor a strong glass modifier., Rhenium likely exists in isolated ReO4- anions in the interstices of the glass network, as evidenced by the polarized Raman spectrum of the Re glass in the absence of sulfate. Analogous to SO42- in similar glasses, ReO4- is likely a network modifier and forms alkali salt phases on the surface and in the bulk glass above solubility.

  19. HIGH VELOCITY PRECESSING JETS FROM THE WATER FOUNTAIN IRAS 18286-0959 REVEALED BY VERY LONG BASELINE ARRAY OBSERVATIONS

    SciTech Connect (OSTI)

    Yung, Bosco H. K.; Nakashima, Jun-ichi; Kwok, Sun [Department of Physics, University of Hong Kong, Pokfulam Rd., Hong Kong (Hong Kong); Imai, Hiroshi [Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065 (Japan); Deguchi, Shuji [Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-1305 (Japan); Diamond, Philip J. [Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester, Manchester M13 9PL (United Kingdom)

    2011-11-10T23:59:59.000Z

    We report the results of multi-epoch Very Long Baseline Array observations of the 22.2 GHz H{sub 2}O maser emission associated with the 'water fountain' IRAS 18286-0959. We suggest that this object is the second example of a highly collimated bipolar precessing outflow traced by H{sub 2}O maser emission, the other is W 43A. The detected H{sub 2}O emission peaks are distributed over a velocity range from -50 km s{sup -1} to 150 km s{sup -1}. The spatial distribution of over 70% of the identified maser features is found to be highly collimated along a spiral jet (jet 1) extended southeast to northwest; the remaining features appear to trace another spiral jet (jet 2) with a different orientation. The two jets form a 'double-helix' pattern which lies across {approx}200 mas. The maser distribution is reasonably fit by a model consisting of two bipolar precessing jets. The three-dimensional velocities of jet 1 and jet 2 are derived to be 138 km s{sup -1} and 99 km s{sup -1}, respectively. The precession period of jet 1 is about 56 years. For jet 2, three possible models are tested and they give different values for the kinematic parameters. We propose that the appearance of two jets is the result of a single driving source with significant proper motion.

  20. Observations of 6.7 GHz Methanol Masers with EAVN I: VLBI Images of the first Epoch of Observations

    E-Print Network [OSTI]

    Fujisawa, Kenta; Motogi, Kazuhito; Hachisuka, Kazuya; Yonekura, Yoshinori; Sawada-Satoh, Satoko; Matsumoto, Naoko; Sorai, Kazuo; Momose, Munetake; Saito, Yu; Takaba, Hiroshi; Ogawa, Hideo; Kimura, Kimihiro; Niinuma, Kotaro; Hirano, Daiki; Omodaka, Toshihiro; Kobayashi, Hideyuki; Kawaguchi, Noriyuki; Shibata, Katsunori M; Honma, Mareki; Hirota, Tomoya; Murata, Yasuhiro; Doi, Akihiro; Mochizuki, Nanako; Shen, Zhiqiang; Chen, Xi; Xia, Bo; Li, Bin; Kim, Kee-Tae

    2013-01-01T23:59:59.000Z

    Very long baseline interferometry (VLBI) monitoring of the 6.7 GHz methanol maser allows us to measure the internal proper motions of the maser spots and therefore study the gas motion around high-mass young stellar objects. To this end, we have begun monitoring observations with the East-Asian VLBI Network. In this paper we present the results of the first epoch observation for 36 sources, including 35 VLBI images of the methanol maser. Since two independent sources were found in three images, respectively, images of 38 sources were obtained. In 34 sources, more than or equal to 10 spots were detected. The observed spatial scale of the maser distribution was from 9 to 4900 astronomical units, and the following morphological categories were observed: elliptical, arched, linear, paired, and complex. The position of the maser spot was determined to an accuracy of approximately 0.1 mas, sufficiently high to measure the internal proper motion from two years of monitoring observations. The VLBI observation, howeve...

  1. Parallel Index and Query for Large Scale Data Analysis

    SciTech Connect (OSTI)

    Chou, Jerry; Wu, Kesheng; Ruebel, Oliver; Howison, Mark; Qiang, Ji; Prabhat,; Austin, Brian; Bethel, E. Wes; Ryne, Rob D.; Shoshani, Arie

    2011-07-18T23:59:59.000Z

    Modern scientific datasets present numerous data management and analysis challenges. State-of-the-art index and query technologies are critical for facilitating interactive exploration of large datasets, but numerous challenges remain in terms of designing a system for process- ing general scientific datasets. The system needs to be able to run on distributed multi-core platforms, efficiently utilize underlying I/O infrastructure, and scale to massive datasets. We present FastQuery, a novel software framework that address these challenges. FastQuery utilizes a state-of-the-art index and query technology (FastBit) and is designed to process mas- sive datasets on modern supercomputing platforms. We apply FastQuery to processing of a massive 50TB dataset generated by a large scale accelerator modeling code. We demonstrate the scalability of the tool to 11,520 cores. Motivated by the scientific need to search for inter- esting particles in this dataset, we use our framework to reduce search time from hours to tens of seconds.

  2. Hilbert's Sixth Problem: Descriptive Statistics as New Foundations for Probability

    E-Print Network [OSTI]

    Johnson, Joseph F

    2014-01-01T23:59:59.000Z

    Hay esbozas tras las cuales las probabilidades se cuentan como la fundaci\\'on de la teor\\'\\i a matem\\'atica de las estad\\'\\i sticas. Mas la significaci\\'on f\\'\\i sica de las probabilidades matem\\'aticas son oscuros, muy poco entendidos. Parecer\\'\\i a mejor que las probabilidades f\\'\\i sicas sean fundadas en las estad\\'\\i sticas descriptivas de datos fisicales. Se trate una teor\\'\\i a que as\\'\\i responde a una cuestiona de Hilbert propuesta en su Problema N\\'umero Seis, la axiomatizaci\\'on de la F\\'\\i sica. Est\\'a basada en la auto-correlaci\\'on de los series temporales. Casi todas de las funciones de auto-correlaci\\'on de las trayector\\'\\i as de un sistema din\\'amico lineal (de lo cual el n\\'umero de sus grados de libertad sea bastante grande) son todas aproximadamente iguales, no importan las condiciones iniciales, a\\'un si el sistema no sea erg\\'odico, como conjetur\\'o Khintchine en 1943. Usually, the theory of probability has been made the foundation for the theory of statistics. But the physical significa...

  3. An asymmetry detected in the disk of Kappa CMa with the AMBER/VLTI

    E-Print Network [OSTI]

    Anthony Meilland; Florentin Millour; Philippe Stee; Armando Domiciano De Souza; Romain Petrov; Denis Mourard; Slobodan Jankov; Sylvie Robbe-Dubois; Alain Spang; Eric Arisitidi

    2006-11-17T23:59:59.000Z

    Aims. We study the geometry and kinematics of the circumstellar environment of the Be star Kappa CMa in the Br gamma emission line and its nearby continuum. Methods. We use the VLTI/AMBER instrument operating in the K band which provides a spatial resolution of about 6 mas with a spectral resolution of 1500 to study the kinematics within the disk and to infer its rotation law. In order to obtain more kinematical constraints we also use an high spectral resolution Pa beta line profile obtain in December 2005 at the Observatorio do Pico do Dios, Brazil and we compile V/R line profile variations and spectral energy distribution data points from the literature. Results. Using differential visibilities and differential phases across the Br gamma line we detect an asymmetry in the disk. Moreover, we found that kappa CMa seems difficult to fit within the classical scenario for Be stars, illustrated recently by alpha Arae observations, i.e. a fast rotating B star close to its breakup velocity surrounded by a Keplerian circumstellar disk with an enhanced polar wind. Finally we discuss the possibility for kappa CMa to be a critical rotator with a Keplerian rotating disk and try to see if the detected asymmetry can be interpreted within the "one-armed" viscous disk framework.

  4. Discovery of an Unbound Hyper-Velocity Star in the Milky Way Halo

    E-Print Network [OSTI]

    Warren R. Brown; Margaret J. Geller; Scott J. Kenyon; Michael J. Kurtz

    2005-01-11T23:59:59.000Z

    We have discovered a star, SDSS J090745.0+024507, leaving the Galaxy with a heliocentric radial velocity of +853+-12 km/s, the largest velocity ever observed in the Milky Way halo. The star is either a hot blue horizontal branch star or a B9 main sequence star with a heliocentric distance ~55 kpc. Corrected for the solar reflex motion and to the local standard of rest, the Galactic rest-frame velocity is +709 km/s. Because its radial velocity vector points 173.8 deg from the Galactic center, we suggest that this star is the first example of a hyper-velocity star ejected from the Galactic center as predicted by Hills and later discussed by Yu & Tremaine. The star has [Fe/H]~0, consistent with a Galactic center origin, and a travel time of <80 Myr from the Galactic center, consistent with its stellar lifetime. If the star is indeed traveling from the Galactic center, it should have a proper motion of 0.3 mas/yr observable with GAIA. Identifying additional hyper-velocity stars throughout the halo will constrain the production rate history of hyper-velocity stars at the Galactic center.

  5. NAVY PRECISION OPTICAL INTERFEROMETER OBSERVATIONS OF THE EXOPLANET HOST {kappa} CORONAE BOREALIS AND THEIR IMPLICATIONS FOR THE STAR'S AND PLANET'S MASSES AND AGES

    SciTech Connect (OSTI)

    Baines, Ellyn K.; Armstrong, J. Thomas [Remote Sensing Division, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375 (United States); Van Belle, Gerard T., E-mail: ellyn.baines@nrl.navy.mil [Lowell Observatory, Flagstaff, AZ 86001 (United States)

    2013-07-01T23:59:59.000Z

    We used the Navy Precision Optical Interferometer to measure the limb-darkened angular diameter of the exoplanet host star {kappa} CrB and obtained a value of 1.543 {+-} 0.009 mas. We calculated its physical radius (5.06 {+-} 0.04 R{sub Sun }) and used photometric measurements from the literature with our diameter to determine {kappa} CrB's effective temperature (4788 {+-} 17 K) and luminosity (12.13 {+-} 0.09 L{sub Sun }). We then placed the star on an Hertzsprung-Russell diagram to ascertain the star's age (3.42{sup +0.32}{sub -0.25} Gyr) and mass (1.47 {+-} 0.04 M{sub Sun }) using a metallicity of [Fe/H] = +0.15. With this mass, we calculated the system's mass function with the orbital elements from a variety of sources, which produced a range of planetary masses: m{sub p}sin i = 1.61-1.88 M{sub Jup}. We also updated the extent of the habitable zone for the system using our new temperature.

  6. Searching for solar-like oscillations in the delta Scuti star rho Puppis

    E-Print Network [OSTI]

    Antoci, V; Grundahl, F; Carrier, F; Brugamyer, E J; Robertson, P; Kjeldsen, H; Kok, Y; Ireland, M; Matthews, J M

    2013-01-01T23:59:59.000Z

    Despite the shallow convective envelopes of delta Scuti pulsators, solar-like oscillations are theoretically predicted to be excited in those stars as well. To search for such stochastic oscillations we organised a spectroscopic multi-site campaign for the bright, metal-rich delta Sct star rho Puppis. We obtained a total of 2763 high-resolution spectra using four telescopes. We discuss the reduction and analysis with the iodine cell technique, developed for searching for low-amplitude radial velocity variations, in the presence of high-amplitude variability. Furthermore, we have determined the angular diameter of rho Puppis to be 1.68 \\pm 0.03 mas, translating into a radius of 3.52 \\pm 0.07Rsun. Using this value, the frequency of maximum power of possible solar-like oscillations, is expected at ~43 \\pm 2 c/d (498 \\pm 23 muHz). The dominant delta Scuti-type pulsation mode of rho Puppis is known to be the radial fundamental mode which allows us to determine the mean density of the star, and therefore an expecte...

  7. VLBI OBSERVATIONS OF THE TYPE I b/c SUPERNOVA 2009bb

    SciTech Connect (OSTI)

    Bietenholz, M. F. [Hartebeesthoek Radio Observatory, P.O. Box 443, Krugersdorp, 1740 (South Africa); Soderberg, A. M. [Harvard-Smithsonian Center for Astrophysics, Theory Division, 60 Garden Street, Cambridge, MA 02138 (United States); Bartel, N. [Department of Physics and Astronomy, York University, Toronto, M3J 1P3, Ontario (Canada); Ellingsen, S. P. [School of Mathematics and Physics, University of Tasmania, Hobart, Tasmania (Australia); Horiuchi, S. [Canberra Deep Space Communication Complex, P.O. Box 1035, Tuggeranong, ACT 2901 (Australia); Phillips, C. J.; Tzioumis, A. K.; Wieringa, M. H. [Australia Telescope National Facility, Epping NSW (Australia); Chugai, N. N. [Institute of Astronomy, RAS, Pyatnitskaya 48, Moscow 119017 (Russian Federation)

    2010-12-10T23:59:59.000Z

    We report on VLBI as well as Very Large Array radio observations of the Type I b/c supernova 2009bb. The high radio luminosity of this supernova seems to require relativistic outflow, implying that the early radio emission was 'engine-driven', that is, driven by collimated outflow from a compact object, even though no gamma-ray emission was seen. The radio light curve shows a general decline, with a 'bump' near t = 52 d, seen most prominently at 5 GHz. The light-curve bump could be either engine-driven or it might represent the turn-on of the normal radio emission from a supernova, driven by interaction with the circumstellar material rather than by the engine. We undertook VLBI observations to resolve SN 2009bb's relativistic outflow. Our observations constrain the angular outer radius at an age of 85 d to be <0.64 mas, corresponding to <4 x 10{sup 17} cm and an average apparent expansion speed of <1.74 c. This result is consistent with the moderately relativistic ejecta speeds implied by the radio luminosity and spectrum.

  8. La frontera a alto corrimiento al rojo: historia de la formacio'n de las galaxias

    E-Print Network [OSTI]

    Jordi Miralda-Escude

    1999-10-29T23:59:59.000Z

    This review presents a brief discussion of the theory of Cold Dark Matter of structure formation in the universe, describing the main processes determining the power spectrum, the non-linear gravitational collapse, the formation of galaxies and the evolution of the intergalactic medium. Recent advances in the observations of high redshift galaxies, and their interpretation in the context of this theory, are then summarized. Este art\\'\\i culo de revisi\\'on presenta una breve exposici\\'on de la teor\\'\\i a de la Materia Invisible Fr\\'\\i a de la formaci\\'on de estructura en el universo, describiendo los procesos m\\'as importantes que determinan el espectro de potencia, el colapso gravitatorio no lineal, la formaci\\'on de galaxias y la evoluci\\'on del medio intergal\\'actico. Resumimos tambi\\'en los avances recientes en las observaciones de galaxias a alto corrimiento al rojo, y la interpretaci\\'on en el contexto de esa teor\\'\\i a.

  9. The nature and fate of natural resins in the geosphere - VIII - NMR and Py-GC-MS characterization of soluble labdanoid polymers isolated from holocene class I resins.

    SciTech Connect (OSTI)

    Clifford, D. J.; Hatcher, P. G.; Botto, R. E.; Muntean, J. V.; Michaels, B.; Anderson, K. B.; Chemistry; Pennsylvania State Univ.; Amoco Oil Co.

    1997-01-01T23:59:59.000Z

    Soluble polylabdanoids isolated by sequential solvent extraction have been characterized by liquid-state {sup 13}C- and {sup 1}H NMR and {sup 13}C-{sup 1}H HMQC (heteronuclear correlation) NMR spectroscopy in addition to solid-state NMR and Py-GC-MS techniques. Two Holocene resins originating from Santander, Colombia and Mombasa, Kenya were analyzed. Soluble polymers were isolated by extraction with a 1:1 (v/v) methylene chloride-methanol mixture following sequential extractions with methylene chloride and methanol. The molecular weight of polymer extracts was shown by GPC analyses to exceed that of non-polymeric occluded terpenoids. Py-GC-MS, solid-state {sup 13}C CP/MAS and {sup 13}C cross-polarization/depolarization NMR spectroscopy results indicated that chemical compositions of soluble polymers isolated from immature resins are highly representative of the structure of corresponding insoluble polymers, i.e. polylabdatrienes. These data provide evidence for cross-linking or cyclization of side-chain olefinic carbons during or shortly after polymerization. Generally, the characterization of soluble resin polymers by liquid-state NMR spectroscopy has proven to be an excellent means for investigating the maturation mechanism of polylabdanoid resinites, and has potential for furthering the application of Class I resinites as geothermal indicators.

  10. Astrometric Discovery of GJ 802b: In the Brown Dwarf Oasis?

    E-Print Network [OSTI]

    Pravdo, S H; Lloyd, J; Pravdo, Steven H.; Shaklan, Stuart B.; Lloyd, James

    2005-01-01T23:59:59.000Z

    The Stellar Planet Survey is an ongoing astrometric search for giant planets and brown dwarfs around a sample of about 30 M-dwarfs. We have discovered several low-mass companions by measuring the motion of our target stars relative to their reference frames. The lowest mass discovery thus far is GJ 802b, a companion to the M5-dwarf GJ 802A. The orbital period is 3.14 +/- 0.03 y, the system mass is 0.214 +/- 0.045 Msolar, and the semi-major axis is 1.28 +/- 0.10 AU or 81 +/- 6 mas. Imaging observations indicate that GJ 802b is likely to be a brown dwarf with the astrometrically determined mass 0.058 +/- 0.021 Msolar (one sigma limits). The remaining uncertainty in the orbit is the eccentricity that is now loosely constrained. We discuss how the system age limits the mass and the prospects to further narrow the mass range when e is more precisely determined.

  11. Astrometric Discovery of GJ 802b: In the Brown Dwarf Oasis?

    E-Print Network [OSTI]

    Steven H. Pravdo; Stuart B. Shaklan; James Lloyd

    2005-05-10T23:59:59.000Z

    The Stellar Planet Survey is an ongoing astrometric search for giant planets and brown dwarfs around a sample of about 30 M-dwarfs. We have discovered several low-mass companions by measuring the motion of our target stars relative to their reference frames. The lowest mass discovery thus far is GJ 802b, a companion to the M5-dwarf GJ 802A. The orbital period is 3.14 +/- 0.03 y, the system mass is 0.214 +/- 0.045 Msolar, and the semi-major axis is 1.28 +/- 0.10 AU or 81 +/- 6 mas. Imaging observations indicate that GJ 802b is likely to be a brown dwarf with the astrometrically determined mass 0.058 +/- 0.021 Msolar (one sigma limits). The remaining uncertainty in the orbit is the eccentricity that is now loosely constrained. We discuss how the system age limits the mass and the prospects to further narrow the mass range when e is more precisely determined.

  12. Direct numerical simulations of convective heat transfer

    SciTech Connect (OSTI)

    Pointel, G.; Acharya, S.; Sharma, C. [Louisiana State Univ., Baton Rouge, LA (United States). Mechanical Engineering Dept.

    1996-11-01T23:59:59.000Z

    This paper deals with the development of a direct numerical simulation (DNS) code for solving the incompressible Navier-Stokes equation using higher order finite difference schemes. The time dependent Navier Stokes equation has been discretized using semi-implicit second order time splitting scheme, which requires the solution of pressure Poisson equation. For this purpose a Galerkin Fourier transform in the spanwise direction and a matrix diagonalization technique is used. The convection terms are formulated in non-conservative form on a collocated grid. A fifth order upwind biased scheme is used for this purpose. Diffusion terms are differenced using a sixth order central difference scheme. The algorithm is implemented on the MasPar MP-1, a Single Instruction Multiple Data computer where efficient data parallelization is used to get DNS results. The code has been used to get results for smooth channel flow at Re{sub {tau}} = 180. Results are now being obtained for the energy equation and for flow in a periodic ribbed channel.

  13. Continuing EVN monitoring of HST-1 in the jet of M87

    E-Print Network [OSTI]

    Hada, Kazuhiro; Giovannini, Gabriele; Casadio, Carolina; Beilicke, Matthias; Cesarini, Andrea; Cheung, Teddy; Doi, Akihiro; Gmez, Jos Luis; Krawczynski, Henric; Kino, Motoki; Nagai, Hiroshi

    2015-01-01T23:59:59.000Z

    The relativistic jet in M87 offers a unique opportunity for understanding the detailed jet structure and emission processes due to its proximity. In particular, the peculiar jet region HST-1 at ~1 arcsecond (or 80 pc, projected) from the nucleus has attracted a great deal of interest in the last decade because of its superluminal motion and broadband radio-to-X-ray outbursts, which may be further connected to the gamma-ray productions up to TeV energies. Over the last five years, we have been doing an intensive monitoring of HST-1 with EVN at 5GHz in order to examine the detailed structural evolution and its possible connection to high-energy activities. While this program already yielded interesting results in terms of the detailed mas-scale structure, proper motion measurements and structural variations, the recent HST-1 brightness is continuously decreasing at this frequency. To counter this, we have shifted our monitoring frequency to 1.7GHz from October 2013. This strategy successfully recovered the fain...

  14. Characterizing Lenses and Lensed Stars of High-Magnification Gravitational Microlensing Events With Lenses Passing Over Source Stars

    E-Print Network [OSTI]

    Choi, J -Y; Park, S -Y; Han, C; Gould, A; Sumi, T; Udalski, A; Beaulieu, J -P; Street, R; Dominik, M; Allen, W; Bos, M; Christie, G W; Depoy, D L; Dong, S; Drummond, J; Gal-Yam, A; Gaudi, B S; Henderson, C B; Hung, L -W; Janczak, J; Lee, C -U; Mallia, F; Maury, A; McCormick, J; McGregor, D; Monard, L A G; Moorhouse, D; Muoz, J A; Natusch, T; Nelson, C; Park, B -G; Pogge, R W; Tan, T -G "TG"; Thornley, G; Yee, J C; Abe, F; Barnard, E; Baudry, J; Bennett, D P; Bond, I A; Botzler, C S; Freeman, M; Fukui, A; Furusawa, K; Hayashi, F; Hearnshaw, J B; Hosaka, S; Itow, Y; Kamiya, K; Kilmartin, P M; Kobara, S; Korpela, A; Lin, W; Ling, C H; Makita, S; Masuda, K; Matsubara, Y; Miyake, N; Muraki, Y; Nagaya, M; Nishimoto, K; Ohnishi, K; Okumura, T; Omori, K; Perrott, Y C; Rattenbury, N; Saito, To; Skuljan, L; Sullivan, D J; Suzuki, D; Suzuki, K; Sweatman, W L; Takino, S; Tristram, P J; Wada, K; Yock, P C M; Szyma?ski, M K; Kubiak, M; Pietrzy?ski, G; Soszy?ski, I; Poleski, R; Ulaczyk, K; Wyrzykowski, ?; Koz?owski, S; Pietrukowicz, P; Albrow, M D; Bachelett, E; Batista, V; Bennett, C; Bowens-Rubin, R; Brillant, S; Cassan, A; Cole, A; Corrales, E; Coutures, Ch; Dieters, S; Prester, D Dominis; Donatowicz, J; Fouqu, P; Greenhill, J; Kane, S R; Menzies, J; Sahu, K C; Wambsganss, J; Williams, A; Zub, M; Allan, A; Bramich, D M; Browne, P; Clay, N; Fraser, S; Horne, K; Kains, N; Mottram, C; Snodgrass, C; Steele, I; Tsapras, Y; Alsubai, K A; Bozza, V; Burgdorf, M J; Novati, S Calchi; Dodds, P; Dreizler, S; Finet, F; Gerner, T; Glitrup, M; Grundahl, F; Hardis, S; Harpse, K; Hinse, T C; Hundertmark, M; Jrgensen, U G; Kerins, E; Liebig, C; Maier, G; Mancini, L; Mathiasen, M; Penny, M T; Proft, S; Rahvar, S; Ricci, D; Scarpetta, G; Schfer, S; Schnebeck, F; Skottfelt, J; Surdej, J; Southworth, J; Zimmer, F

    2011-01-01T23:59:59.000Z

    We present the analysis of the light curves of 9 high-magnification gravitational microlensing events with lenses passing over source stars, including OGLE-2004-BLG-254, MOA-2007-BLG-176, MOA-2007-BLG-233/OGLE-2007-BLG-302, MOA-2009-BLG-174, MOA-2010-BLG-436, MOA-2011-BLG-093, MOA-2011-BLG-274, OGLE-2011-BLG-0990/MOA-2011-BLG-300, and OGLE-2011-BLG-1101/MOA-2011-BLG-325. For all events, we measure the linear limb-darkening coefficients of the surface brightness profile of source stars by measuring the deviation of the light curves near the peak affected by the finite-source effect. For 8 events, we measure the Einstein radii and the lens-source relative proper motions. Among them, 6 events (OGLE-2004-BLG-254, MOA-2007-BLG-176, MOA-2007-BLG-233/OGLE-2007-BLG-302, MOA-2011-BLG-093, MOA-2011-BLG-274, and OGLE-2011-BLG-0990/MOA-2011-BLG-300) are found to have Einstein radii less than 0.2 mas, making the lenses candidates of very low-mass stars or brown dwarfs. For MOA-2011-BLG-274, especially, the small Einstein ...

  15. Unlocking the Standard Model. IV. N=2 generations of quarks : spectrum and mixing

    E-Print Network [OSTI]

    Machet, Bruno

    2013-01-01T23:59:59.000Z

    The Glashow-Salam-Weinberg model for 2 generations of quarks is extended to 8 composite Higgs multiplets, with no adjunction of extra fermions. It is the minimal number of Higgs doublets required to suitably account, simultaneously, for the spectrum of pseudoscalar mesons that can be built with 4 quarks and for the mass of the W gauge bosons. These masses being used as input, together with elementary low energy considerations for the pions, we calculate all other parameters, masses and couplings. We focus in this work on the spectrum of the 8 Higgs bosons (which all potentially contribute to the W and quark masses), and on the mixing (Cabibbo) angle, leaving the study of couplings to a subsequent work. The Higgs bosons fall into one triplet, two doublets and one singlet. In the triplet stand three states with masses \\sqrt{2} x that of heaviest pseudoscalar meson D_s, which, for 2 generations, pushes them up to 2.80 GeV. The 2 components of the first doublet have masses close to 1.25 GeV. The singlet has a mas...

  16. V405 Peg (RBS 1955): A Nearby, Low-Luminosity Cataclysmic Binary

    E-Print Network [OSTI]

    Thorstensen, J R; Schwope, A D; Staude, A; Vogel, J; Krumpe, M; Kohnert, J; Gomez-Moran, A Nebot

    2009-01-01T23:59:59.000Z

    (Abridged). The cataclysmic binary V405 Peg, originally discovered as ROSAT Bright Source (RBS) 1955 (= 1RXS J230949.6+213523), shows a strong contribution from a late-type secondary star in its optical spectrum, which led Schwope et al. to suggest it to be among the nearest cataclysmic binaries. We present extensive optical observations of V405 Peg. Time-series spectroscopy shows the orbital period, Porb, to be 0.1776469(7) d (= 4.2635 hr), or 5.629 cycle/d. We classify the secondary as M3 - M4.5. Astrometry with the MDM 2.4m telescope gives a parallax 7.2 +- 1.1 milli-arcsec, and a relative proper motion of 58 mas/yr. Our best estimate of the distance yields d = 149 (+26, -20) pc. The secondary stars's radial velocity has K2 = 92 +- 3 km/s, indicating a fairly low orbital inclination if the masses are typical. Extensive I-band time-series observations in the show the system varying between a minimum brightness level of I = 14.14 and states of enhanced activity about 0.2 mag brighter. While the low-state sho...

  17. Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations

    E-Print Network [OSTI]

    Marcote, B; Paredes, J M; Ishwara-Chandra, C H

    2015-01-01T23:59:59.000Z

    We have studied in detail the 0.15-15 GHz radio spectrum of the gamma-ray binary LS 5039 to look for a possible turnover and absorption mechanisms at low frequencies, and to constrain the physical properties of its emission. We have analysed two archival VLA monitorings, all the available archival GMRT data and a coordinated quasi-simultaneous observational campaign conducted in 2013 with GMRT and WSRT. The data show that the radio emission of LS 5039 is persistent on day, week and year timescales, with a variability $\\lesssim 25~\\%$ at all frequencies, and no signature of orbital modulation. The obtained spectra reveal a power-law shape with a curvature below 5 GHz and a turnover at $\\sim0.5$ GHz, which can be reproduced by a one-zone model with synchrotron self-absorption plus Razin effect. We obtain a coherent picture for a size of the emitting region of $\\sim0.85~\\mathrm{mas}$, setting a magnetic field of $B\\sim20~\\mathrm{mG}$, an electron density of $n_{\\rm e}\\sim4\\times10^5~{\\rm cm^{-3}}$ and a mass-los...

  18. The nature of the methanol maser ring G23.657-00.127

    E-Print Network [OSTI]

    A. Bartkiewicz; A. Brunthaler; M. Szymczak; H. J. van Langevelde; M. J. Reid

    2008-09-11T23:59:59.000Z

    Methanol masers are associated with young high-mass stars and are an important tool for investigating the process of massive star formation. The recently discovered methanol maser ring in G23.657-00.127 provides an excellent ``laboratory'' for a detailed study of the nature and physical origin of methanol maser emission, as well as parallax and proper motion measurements. Multi-epoch observations of the 12.2 GHz methanol maser line from the ring were conducted using the Very Long Baseline Array. Interferometric observations with milliarcsecond resolution enabled us to track single maser spots in great detail over a period of 2 years. We have determined the trigonometric parallax of G23.657-00.127 to be 0.313+/-0.039 mas, giving a distance of 3.19{+0.46}{-0.35} kpc. The proper motion of the source indicates that it is moving with the same circular velocity as the LSR, but it shows a large peculiar motion of about 35 km/s toward the Galactic center.

  19. Seyfert galaxies: Nuclear Radio Structure and Unification

    E-Print Network [OSTI]

    Lal, Dharam V; Gabuzda, Denise

    2011-01-01T23:59:59.000Z

    A radio study of a carefully selected sample of 20 Seyfert galaxies that are matched in orientation-independent parameters, which are measures of intrinsic active galactic nuclei (AGN) power and host galaxy properties is presented to test the predictions of the unified scheme hypothesis. Our sample sources have core flux densities greater than 8 mJy at 5 GHz on arcsec-scales due to the feasibility requirements. These simultaneous pc-scale and kpc-scale radio observations reveal (i) that Seyfert 1 and Seyfert 2 galaxies have equal tendency to show compact radio structures on mas-scales, (ii) the distributions of pc-scale and kpc-scale radio luminosities are similar for both Seyfert 1 and Seyfert 2 galaxies, (iii) no evidence for relativistic beaming in Seyfert galaxies, (iv) similar distributions of source spectral indices in spite of the fact that Seyferts show nuclear radio flux density variations, and (v) the distributions of projected linear size for Seyfert 1 and Seyfert 2 galaxies are not significantly d...

  20. Steam-assisted crystallization of TPA{sup +}-exchanged MCM-41 type mesoporous materials with thick pore walls

    SciTech Connect (OSTI)

    Chen, Hong Li; Zhang, Kun [Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062 (China)] [Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062 (China); Wang, Yi Meng, E-mail: ymwang@chem.ecnu.edu.cn [Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062 (China)

    2012-07-15T23:59:59.000Z

    Highlights: ? Mesoporous Ti-containing silica with thicker pore walls was synthesized. ? Ion-exchange and steam-assisted crystallization led to MCM-41/MFI composite. ? The introduction of Ti inhibited the formation of separated MFI particles. ? Lower temperature favored retaining mesoporous characteristics and morphology. -- Abstract: Hierarchical MCM-41/MFI composites were synthesized through ion-exchange of as-made MCM-41 type mesoporous materials with tetrapropylammonium bromide and subsequent steam-assisted recrystallization. The obtained samples were characterized by powder X-ray diffraction (XRD), UVvis diffuse reflectance spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis, FT-IR, {sup 1}H{sup 13}C CP/MAS and nitrogen adsorptiondesorption. The XRD patterns show that the MCM-41/MFI composite possesses both ordered MCM-41 phase and zeolite MFI phase. SEM and TEM images indicate that the recrystallized materials retained the mesoporous characteristics and the morphology of as-made mesoporous materials without the formation of bulky zeolite, quite different from the mechanical mixture of MCM-41 and MFI structured zeolite. Among others, lower recrystallization temperature and the introduction of the titanium to the parent materials are beneficial to preserve the mesoporous structure during the recrystallization process.

  1. Radio Synchrotron Emission from a Bow Shock around the Gas Cloud G2 Heading toward the Galactic Center

    E-Print Network [OSTI]

    Narayan, Ramesh; Sironi, Lorenzo

    2012-01-01T23:59:59.000Z

    A dense ionized cloud of gas has been recently discovered to be moving directly toward the supermassive black hole, Sgr A*, at the Galactic Center. In June 2013, at the pericenter of its highly eccentric orbit, the cloud will be approximately 3100 Schwarzschild radii from the black hole and will move supersonically through the ambient hot gas with a velocity of v_p ~ 5400 km/s. A bow shock is likely to form in front of the cloud and could accelerate electrons to relativistic energies. We estimate via particle-in-cell simulations the energy distribution of the accelerated electrons and show that the non-thermal synchrotron emission from these electrons might exceed the quiescent radio emission from Sgr A* by a factor of several. The enhanced radio emission should be detectable at GHz and higher frequencies around the time of pericentric passage and in the following months. The bow shock emission is expected to be displaced from the quiescent radio emission of Sgr A* by ~33 mas. Interferometric observations cou...

  2. Synthesis and nano-mechanical characterization of calcium-silicate-hydrate (C-S-H) made with 1.5 CaO/SiO{sub 2} mixture

    SciTech Connect (OSTI)

    Foley, Emmy M. [Arizona Public Service, Wintersburg, AZ 85354 (United States)] [Arizona Public Service, Wintersburg, AZ 85354 (United States); Kim, Jung J. [Department of Civil and Environmental Engineering, Sejong University, Seoul 143-747 (Korea, Republic of)] [Department of Civil and Environmental Engineering, Sejong University, Seoul 143-747 (Korea, Republic of); Reda Taha, M.M., E-mail: mrtaha@unm.edu [Department of Civil Engineering, MSC01 1070, 1 University of New Mexico, Albuquerque, NM 87131-0001 (United States)

    2012-09-15T23:59:59.000Z

    In this study, calcium silicate hydrate (C-S-H) is synthesized and characterized. C-S-H slurry was made with calcium oxide (CaO) to micro-silica (SiO{sub 2}) mixture ratio of 1.5 and enough deionized water. The slurry was continuously mixed for 7 days, then the excess water was removed. Two methods of drying were implemented: one method used the standard d-dry technique and the other was equilibrated to 11% relative humidity (RH). The dried powders were characterized using thermo gravimetric analysis (TGA), X-ray diffraction analysis (XRDA), and {sup 29}Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. The stoichiometric formulas of synthetic C-S-H powders dried to d-dry and 11% RH in this study were approximated as C{sub 1.2}SH{sub 0.7} and C{sub 1.2}SH{sub 2.4} respectively. The powders were then compacted to create specimens with porosities similar to C-S-H in hydrated cement. The specimens underwent nanoindentation to mechanically characterize C-S-H. The experiments provide insight on the nanoscale mechanical characteristics of C-S-H.

  3. Deteriorated hardened cement paste structure analyzed by XPS and {sup 29}Si NMR techniques

    SciTech Connect (OSTI)

    Kurumisawa, Kiyofumi, E-mail: kurumi@eng.hokudai.ac.jp [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)] [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan); Nawa, Toyoharu [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)] [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan); Owada, Hitoshi [Radioactive Waste Management Funding and Research Center, 1-15-7 Tsukishima, Chuo-ku, Tokyo (Japan)] [Radioactive Waste Management Funding and Research Center, 1-15-7 Tsukishima, Chuo-ku, Tokyo (Japan); Shibata, Masahito [Taiheiyo Consultant Co., Ltd., 2-4-2, Ohsaku, Sakura-City, Chiba (Japan)] [Taiheiyo Consultant Co., Ltd., 2-4-2, Ohsaku, Sakura-City, Chiba (Japan)

    2013-10-15T23:59:59.000Z

    In this report, X-ray photoelectron spectroscopy (XPS) and {sup 29}Si-MAS-NMR was used for the evaluation of deteriorated hardened cement pastes. The deterioration by ammonium nitrate solution was accompanied by changes in the pore structure as well as by structural changes in the CSH in the hardened cement paste. The CaO/SiO{sub 2} ratio of the CSH decreased with the progress of deterioration, there was also polymerization of the silicate in the CSH. It was confirmed that the degree of polymerization of silicate of the CSH in hardened cement paste can be determined by XPS. It was also shown that the polymerization depends on the structure of the CSH. -- Highlights: The polymerization of silicate of the CSH in the HCP can be observed by XPS. The structure of CSH changed with the degree of calcium leaching. The NMR result about silicate in CSH was in good agreement with the XPS result.

  4. The Red Radio Ring: a gravitationally lensed hyperluminous infrared radio galaxy at z=2.553 discovered through citizen science

    E-Print Network [OSTI]

    Geach, J E; Verma, A; Marshall, P J; Jackson, N; Belles, P -E; Beswick, R; Baeten, E; Chavez, M; Cornen, C; Cox, B E; Erben, T; Erickson, N J; Garrington, S; Harrison, P A; Harrington, K; Hughes, D H; Ivison, R J; Jordan, C; Lin, Y -T; Leauthaud, A; Lintott, C; Lynn, S; Kapadia, A; Kneib, J -P; Macmillan, C; Makler, M; Miller, G; Montana, A; Mujica, R; Muxlow, T; Narayanan, G; Briain, D O; O'Brien, T; Oguri, M; Paget, E; Parrish, M; Ross, N P; Rozo, E; Rusu, E; Rykoff, E S; Sanchez-Arguelles, D; Simpson, R; Snyder, C; Schloerb, F P; Tecza, M; Van Waerbeke, L; Wilcox, J; Viero, M; Wilson, G W; Yun, M S; Zeballos, M

    2015-01-01T23:59:59.000Z

    We report the discovery of a gravitationally lensed hyperluminous infrared galaxy (L_IR~10^13 L_sun) with strong radio emission (L_1.4GHz~10^25 W/Hz) at z=2.553. The source was identified in the citizen science project SpaceWarps through the visual inspection of tens of thousands of iJKs colour composite images of Luminous Red Galaxies (LRGs), groups and clusters of galaxies and quasars. Appearing as a partial Einstein ring (r_e~3") around an LRG at z=0.2, the galaxy is extremely bright in the sub-millimetre for a cosmological source, with the thermal dust emission approaching 1 Jy at peak. The redshift of the lensed galaxy is determined through the detection of the CO(3-2) molecular emission line with the Large Millimetre Telescope's Redshift Search Receiver and through [OIII] and H-alpha line detections in the near-infrared from Subaru/IRCS. We have resolved the radio emission with high resolution (300-400 mas) eMERLIN L-band and JVLA C-band imaging. These observations are used in combination with the near-...

  5. A Brown Dwarf Microlens Candidate in the OGLE-II Database

    E-Print Network [OSTI]

    M. C. Smith; S. Mao; P. R. Wozniak

    2003-01-16T23:59:59.000Z

    We describe a unique mass determination for a microlensing event from the second phase of the Optical Gravitational Microlensing Experiment (OGLE-II). The event, sc26_2218, which is very bright (baseline magnitude I=15.10), appears to exhibit both parallax and finite source effects. The parallax effect allows us to determine the projected Einstein radius on the observer plane (approx. 3.8 AU), while the finite source effect allows us to determine the ratio of the angular source size and the angular Einstein radius. As the angular size of the star can be estimated using its color and magnitude, we can hence determine the angular Einstein radius (approx. 0.1 mas). By combining both the projected and angular Einstein radius we can determine the lens mass M = 0.050^{+0.016}_{-0.011} solar masses, independent of the source distance. The lens is therefore a brown dwarf candidate. However, the `parallax' signature is weak and so we cannot completely discount the possibility that these signatures originate from binary rotation of the source (which would prevent any estimate of the lens mass), rather than parallax. However, this can be tested by future spectroscopic observations. This event highlights the scientific returns for intense monitoring of bright microlensing events, since the parallax and finite source effects can be more easily identified due to their high signal-to-noise ratios.

  6. Solid-State Selective 13C Excitation and Spin Diffusion NMR to Resolve Spatial Dimensions in Plant Cell Walls

    SciTech Connect (OSTI)

    Foston, M.; Katahira, R.; Gjersing, E.; Davis, M. F.; Ragauskas, A. J.

    2012-02-15T23:59:59.000Z

    The average spatial dimensions between major biopolymers within the plant cell wall can be resolved using a solid-state NMR technique referred to as a {sup 13}C cross-polarization (CP) SELDOM (selectively by destruction of magnetization) with a mixing time delay for spin diffusion. Selective excitation of specific aromatic lignin carbons indicates that lignin is in close proximity to hemicellulose followed by amorphous and finally crystalline cellulose. {sup 13}C spin diffusion time constants (T{sub SD}) were extracted using a two-site spin diffusion theory developed for {sup 13}C nuclei under magic angle spinning (MAS) conditions. These time constants were then used to calculate an average lower-limit spin diffusion length between chemical groups within the plant cell wall. The results on untreated {sup 13}C enriched corn stover stem reveal that the lignin carbons are, on average, located at distances {approx}0.7-2.0 nm from the carbons in hemicellulose and cellulose, whereas the pretreated material had larger separations.

  7. The Kinematics of S5 1803+784

    E-Print Network [OSTI]

    N. A. Kudryavtseva; S. Britzen; A. Witzel; E. Ros; M. F. Aller; H. D. Aller; R. M. Campbell; J. A. Zensus; A. Eckart; J. Roland; A. Mehta

    2006-11-06T23:59:59.000Z

    We present the results of a multi-frequency analysis of the structural variability in the parsec-scale jet of the blazar S5 1803+784. More than 90 epochs of observations at 6 frequencies from 1.6 GHz up to 22 GHz have been combined and analyzed. We discuss an alternative jet model for the source. In contrast to previously discussed motion scenarios for S5 1803+784, we find that the jet structure within 12 mas of the core can most easily be described by seven "oscillating" jet features. We find that the parameters of jet features, such as core separation, position angle and flux density, change in a periodic way with a timescale of about 4 years. We also find evidence for a correlation between these parameters and the total flux density variability. We suggest a scenario incorporating a periodic form of motion (e.g. rotation, precession), with a non-negligible geometrical contribution to explain the observational results.

  8. Multi-frequency VLBA study of the blazar S5 0716+714 during the active state in 2004: I. Inner jet kinematics

    E-Print Network [OSTI]

    E. A. Rastorgueva; K. Wiik; T. Savolainen; L. O. Takalo; E. Valtaoja; Y. N. Vetukhnovskaya; K. V. Sokolovsky

    2009-01-14T23:59:59.000Z

    We observed the blazar \\object{0716+714} with the VLBA during its active state in 2003-2004. In this paper we discuss multi-frequency analysis of the inner jet (first 1 mas) kinematics. The unprecedentedly dense time sampling allows us to trace jet components without misidentification and to calculate the component speeds with good accuracy. In the smooth superluminal jet we were able to identify and track three components over time moving outwards with relatively high apparent superluminal speeds (8.5-19.4 $c$), which contradicts the hypothesis of a stationary oscillating jet in this source. Component ejections occur at a relatively high rate (once in two months), and they are accompanied by mm-continuum outbursts. Superluminal jet components move along wiggling trajectories, which is an indication of actual helical motion. Fast proper motion and rapid decay of the components suggest that this source should be observed with the VLBI at a rate of at least once in one or two months in order to trace superluminal jet components without confusion.

  9. High precision difference astrometry applied to the triplet of S5 radio sources B1803+784/Q1928+738/B2007+777

    E-Print Network [OSTI]

    E. Ros; J. M. Marcaide; J. C. Guirado; M. I. Ratner; I. I. Shapiro; T. P. Krichbaum; A. Witzel; R. A. Preston

    1999-07-05T23:59:59.000Z

    We determined the separations of the radio sources in the triangle formed by the BL Lac objects 1803+784 and 2007+777, and the QSO 1928+738 from intercontinental interferometric observations carried out in November 1991 at the frequencies of 2.3 and 8.4 GHz simultaneously. We successfully connected differenced phase delays over 7^o on the sky at 8.4 GHz at an epoch of maximum solar activity. The effects of the ionosphere on these VLBI data were mostly removed by estimates of the total electron content from observations of GPS satellites. The comparison of the estimated separation of QSO 1928+738 and BL 2007+777 with previous such estimates obtained from data at different epochs leads us to a particular alignment of the maps of QSO 1928+738 at different epochs relative to those of BL 2007+777, although with significant uncertainty. For this alignment, the jet components of QSO 1928+738 show a mean proper motion of 0.32+/-0.10 mas/yr and also suggest an identification for the position of the core of this radio source.

  10. Hydroconversion reactions catalyzed by highly stable pillared clays

    SciTech Connect (OSTI)

    Gomez, S.A.; Mosqueira, L.; Espinosa, J.; Fuentes, G.A. [Universidad A. Metropolitana-Iztapalapa (Mexico)

    1993-12-31T23:59:59.000Z

    Al-pillared clays (Al-PILC) and Al-X-PILC (X = Ga, Ni), structurally stable at high temperature - in the case of Ga above 800{degrees}C-have been synthesized by controlling intercalation steps and stabilization procedures. New bidimensional materials with an interlaminar distance about 10-12{angstrom} and with different chemical reactivities in the pillars have thus been produced. The analytical techniques employed to characterize the materials and the processes involved during stabilization include N{sub 2} adsorption, AA, XRD, NH{sub 3}-TPD, TGA-DTA, HR- and MAS-NMR (Al, Si, and Ga) and in-situ IR and DRIFTS. Chemical characterization using high pressure reactions with probe molecules such as diphenylmethane and tert-butylbenzene shows selectivity patterns than can be clearly associated with the microstructure of the PILC used, as well as an effect due to the composition of the pillars. Similar studies with zeolites give patterns that differ from those of PILC, probably because of the change in dimensionality of the internal structure. Poisoning studies with metal porphyrins prove that PLIC have improved resistance compared to standard catalysts. Hydrotreatment of Maya crude results a significant reduction in total sulfur under conditions suitable for commercial operation.

  11. An asymmetry detected in the disk of Kappa CMa with the AMBER/VLTI

    E-Print Network [OSTI]

    Meilland, A; Stee, P; De Souza, A D; Petrov, R; Mourard, D; Jankov, S; Robbe-Dubois, S; Spang, A; Arisitidi, E; Meilland, Anthony; Millour, Florentin; Stee, Philippe; Souza, Armando Domiciano De; Petrov, Romain; Mourard, Denis; Jankov, Slobodan; Robbe-Dubois, Sylvie; Spang, Alain; Arisitidi, Eric; al, et

    2006-01-01T23:59:59.000Z

    Aims. We study the geometry and kinematics of the circumstellar environment of the Be star Kappa CMa in the Br gamma emission line and its nearby continuum. Methods. We use the VLTI/AMBER instrument operating in the K band which provides a spatial resolution of about 6 mas with a spectral resolution of 1500 to study the kinematics within the disk and to infer its rotation law. In order to obtain more kinematical constraints we also use an high spectral resolution Pa beta line profile obtain in December 2005 at the Observatorio do Pico do Dios, Brazil and we compile V/R line profile variations and spectral energy distribution data points from the literature. Results. Using differential visibilities and differential phases across the Br gamma line we detect an asymmetry in the disk. Moreover, we found that kappa CMa seems difficult to fit within the classical scenario for Be stars, illustrated recently by alpha Arae observations, i.e. a fast rotating B star close to its breakup velocity surrounded by a Kepleria...

  12. The Dynamics of Neutrino-Driven Supernova Explosions after Shock Revival in 2D and 3D

    E-Print Network [OSTI]

    Mller, Bernhard

    2015-01-01T23:59:59.000Z

    We study the growth of the explosion energy after shock revival in neutrino-driven explosions in two and three dimensions (2D/3D) using multi-group neutrino hydrodynamics simulations of an $11.2 M_\\odot$ star. The 3D model shows a faster and steadier growth of the explosion energy and already shows signs of subsiding accretion after one second. By contrast, the growth of the explosion energy in 2D is unsteady, and accretion lasts for several seconds as confirmed by additional long-time simulations of stars of similar masses. Appreciable explosion energies can still be reached, albeit at the expense of rather high neutron star masses. In 2D, the binding energy at the gain radius is larger because the strong excitation of downward-propagating $g$-modes removes energy from the freshly accreted material in the downflows. Consequently, the mass outflow rate is considerably lower in 2D than in 3D. This is only partially compensated by additional heating by outward-propagating acoustic waves in 2D. Moreover, the mas...

  13. Monitoring lensed starlight emitted close to the Galactic Center

    E-Print Network [OSTI]

    Adi Nusser; Tom Broadhurst

    2004-07-12T23:59:59.000Z

    We describe the feasibility of detecting the gravitational deflection of light emitted by stars moving under the influence of the massive object at the Galactic center. Light emitted by a star orbiting behind the central mass has a smaller impact parameter than the star itself, and suffers the effect of gravitational lensing, providing a closer probe of the central mass distribution and hence a stricter test of the black hole hypothesis. A mass of $4.3\\times 10^{6} M_{\\odot}$ causes a $0.1-2\\rm mas$ deviation in the apparent position of orbiting stars projected within $10^{\\circ}$ of the line of sight to the galactic center. In addtion, we may uniquely constrain the distance to the center of the galaxy because lensing deflections constrain the ratio $\\rg/R_{0}$ of the Schwarzschild radius to the distance to the black hole, $R_{o}$, whereas the ratio $\\rg/R_{o}^{3}$ is obtained by fitting the orbit.

  14. A LIKELY CLOSE-IN LOW-MASS STELLAR COMPANION TO THE TRANSITIONAL DISK STAR HD 142527

    SciTech Connect (OSTI)

    Biller, Beth; Benisty, Myriam; Chauvin, Gael; Olofsson, Johan; Pott, Joerg-Uwe; Mueller, Andre; Bonnefoy, Mickaeel; Henning, Thomas [Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, 69117 Heidelberg (Germany); Lacour, Sylvestre; Thebault, Philippe [LESIA, CNRS/UMR-8109, Observatoire de Paris, UPMC, Universite Paris Diderot, 5 place Jules Janssen, 92195 Meudon (France); Juhasz, Attila [Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands); Sicilia-Aguilar, Aurora [Departamento de Fisica Teorica, Facultad de Ciencias, Universidad Autonoma de Madrid, 28049 Cantoblanco, Madrid (Spain); Tuthill, Peter [School of Physics, University of Sydney, NSW 2006 (Australia); Crida, Aurelien, E-mail: biller@mpia.de [Universite de Nice - Sophia antipolis/C.N.R.S./Observatoire de la Cote d'Azur, Laboratoire Lagrange (UMR 7293), Boulevard de l'Observatoire, B.P. 4229 06304 NICE cedex 04 (France)

    2012-07-10T23:59:59.000Z

    With the uniquely high contrast within 0.''1 ({Delta}mag(L') = 5-6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, we detected asymmetry in the flux from the Herbig Fe star HD 142527 with a barycenter emission situated at a projected separation of 88 {+-} 5 mas (12.8 {+-} 1.5 AU at 145 pc) and flux ratios in H, K, and L' of 0.016 {+-} 0.007, 0.012 {+-} 0.008, and 0.0086 {+-} 0.0011, respectively (3{sigma} errors), relative to the primary star and disk. After extensive closure-phase modeling, we interpret this detection as a close-in, low-mass stellar companion with an estimated mass of {approx}0.1-0.4 M{sub Sun }. HD 142527 has a complex disk structure, with an inner gap imaged in both the near and mid-IR as well as a spiral feature in the outer disk in the near-IR. This newly detected low-mass stellar companion may provide a critical explanation of the observed disk structure.

  15. ALMA 690 GHz OBSERVATIONS OF IRAS 16293-2422B: INFALL IN A HIGHLY OPTICALLY THICK DISK

    SciTech Connect (OSTI)

    Zapata, Luis A.; Loinard, Laurent; Rodriguez, Luis F.; Hernandez-Hernandez, Vicente [Centro de Radioastronomia y Astrofisica, UNAM, Apdo. Postal 3-72 (Xangari), 58089 Morelia, Michoacan (Mexico); Takahashi, Satoko; Trejo, Alfonso [Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan (China); Parise, Berengere [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany)

    2013-02-10T23:59:59.000Z

    We present sensitive, high angular resolution ({approx}0.''2) submillimeter continuum and line observations of IRAS 16293-2422B made with the Atacama Large Millimeter/Submillimeter Array. The 0.45 mm continuum observations reveal a single and very compact source associated with IRAS 16293-2422B. This submillimeter source has a deconvolved angular size of about 400 mas (50 AU) and does not show any inner structure inside of this diameter. The H{sup 13}CN, HC{sup 15}N, and CH{sub 3}OH line emission regions are about twice as large as the continuum emission and reveal a pronounced inner depression or ''hole'' with a size comparable to that estimated for the submillimeter continuum. We suggest that the presence of this inner depression and the fact that we do not see an inner structure (or a flat structure) in the continuum are produced by very optically thick dust located in the innermost parts of IRAS 16293-2422B. All three lines also show pronounced inverse P-Cygni profiles with infall and dispersion velocities larger than those recently reported from observations at lower frequencies, suggesting that we are detecting faster and more turbulent gas located closer to the central object. Finally, we report a small east-west velocity gradient in IRAS 16293-2422B that suggests that its disk plane is likely located very close to the plane of the sky.

  16. Synthesis and characterization of low-OH?fluor-chlorapatite: A single-crystal XRD and NMR spectroscopic study

    SciTech Connect (OSTI)

    McCubbin, Francis M.; Mason, Harris E.; Park, Hyunsoo; Phillips, Brian L.; Parise, John B.; Nekvasil, Hanna; Lindsley, Donald H. (SBU)

    2008-12-12T23:59:59.000Z

    Los-OH apatite of the compositional range Ca{sub 4.99-5.06}(PO{sub 4}){sub 2.98-3.00}F{sub 0.51-0.48}Cl{sub 0.38-0.36}OH{sub 0.14-0.12} was synthesized and characterized structurally by synchrotron-based single-crystal X-ray diffraction (XRD), and multiple nuclear magnetic resonance (NMR) spectroscopic techniques. the average structure is hexagonal with space group P6{sub 3}/m. The presence of scattering in the single-crystal diffraction data set, which is incommensurate within the average hexagonal structure, suggests the presence of localized short-range monoclinic domains. Complex lineshapes in the {sup 31}P and {sup 19}F MAS NMR spectra are also consistent with the presence of an incommensurate phase. No evidence was detected for splitting of the Ca2 site into two distinct sites (as had been previously reported for hexagonal ternary apatities). Structure refinement and {sup 19}F{l_brace}{sup 35}Cl{r_brace} TRAPDOR NMR experiments verified intercolumnal neighboring of F and Cl atoms (inter-column distance of 2.62 {angstrom}) within this low-OH{sup -} apatite suggesting that long-range neighboring of F and Cl within the apatite anion channels is feasible.

  17. Flexibility of the zeolite RHO framework. In situ X-ray and neutron powder structural characterization of cation-exchanged BePO and BeAsORHO analogs

    SciTech Connect (OSTI)

    Nenoff, T.M. [Univ. of California, Santa Barbara, CA (United States)] [Univ. of California, Santa Barbara, CA (United States); Parise, J.B. [State Univ. of New York, Stony Brook, NY (United States)] [State Univ. of New York, Stony Brook, NY (United States); Jones, G.A.; Galya, L.G.; Corbin, D.R.; Stucky, G.D. [DuPont Co., Wilmington, DE (United States)] [DuPont Co., Wilmington, DE (United States)

    1996-08-15T23:59:59.000Z

    This is an extensive study of the non-aluminosilicate analogs of the zeolite RHO. This molecular sieve is of great interest commercially because of its catalytic properties. In the absence of rigid supporting structural subunits (smaller cages or channels), the aluminosilicate RHO exhibits atypical framework flexibility with large displacivere arrangements. The beryllophosphate and beryalloarsenate analogs are easily synthesized under very mild reaction conditions and therefore maybe of interest for inexpensive and rapid commercial production. However,t hey have decreased thermal stability. In an effort to increase thermal stability and explore framework flexibility, we have synthesized and characterized a series of analogs of the non-aluminosilicate RHO framework. All materials crystallize in the space group I23, ranging from a = 13.584-(2) A for Li-BePO RHO to a = 14.224(4) A for Ba-RbBeAsO RHO for hydrated phases. The extra framework cations are distributed over the double 8-ring, single 8-ring, and two single 6-ring sites. Partially and fully dehydrated phases were also studied for changes in framework stability. Predictive trends based on the type of cation exchanged into the framework were determined by {sup 9}Be and {sup 31}P MAS NMR. 50 refs., 8 figs., 6 tabs.

  18. A technique to derive improved proper motions for Kepler objects of interest

    SciTech Connect (OSTI)

    Benedict, G. Fritz [McDonald Observatory, University of Texas, Austin, TX 78712 (United States); Tanner, Angelle M. [Department of Physics and Astronomy, Mississippi State University, Starkville, MS 39762 (United States); Cargile, Phillip A. [Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States); Ciardi, David R., E-mail: fritz@astro.as.utexas.edu [NASA Exoplanet Science Institute, Caltech, Pasadena, CA 91125 (United States)

    2014-12-01T23:59:59.000Z

    We outline an approach yielding proper motions with higher precision than exists in present catalogs for a sample of stars in the Kepler field. To increase proper-motion precision, we combine first-moment centroids of Kepler pixel data from a single season with existing catalog positions and proper motions. We use this astrometry to produce improved reduced-proper-motion diagrams, analogous to a Hertzsprung-Russell (H-R) diagram, for stars identified as Kepler objects of interest. The more precise the relative proper motions, the better the discrimination between stellar luminosity classes. Using UCAC4 and PPMXL epoch 2000 positions (and proper motions from those catalogs as quasi-Bayesian priors), astrometry for a single test Channel (21) and Season (0) spanning 2 yr yields proper motions with an average per-coordinate proper-motion error of 1.0 mas yr{sup 1}, which is over a factor of three better than existing catalogs. We apply a mapping between a reduced-proper-motion diagram and an H-R diagram, both constructed using Hubble Space Telescope parallaxes and proper motions, to estimate Kepler object of interest K-band absolute magnitudes. The techniques discussed apply to any future small-field astrometry as well as to the rest of the Kepler field.

  19. The Binary White Dwarf LHS 3236

    E-Print Network [OSTI]

    Harris, Hugh; Dupuy, Trent; Canzian, Blaise; Guetter, Harry; Hartkopf, William; Ireland, Michael; Leggett, Sandy; Levine, Stephen; Liu, Michael; Luginbuhl, Christian; Monet, Alice; Stone, Ronald; Subasavage, John; Tilleman, Trudy; Walker, Richard

    2013-01-01T23:59:59.000Z

    The white dwarf LHS 3236 (WD1639+153) is shown to be a double-degenerate binary, with each component having a high mass. Astrometry at the U.S. Naval Observatory gives a parallax and distance of 30.86 +/- 0.25 pc and a tangential velocity of 98 km/s, and reveals binary orbital motion. The orbital parameters are determined from astrometry of the photocenter over more than three orbits of the 4.0-year period. High-resolution imaging at the Keck Observatory resolves the pair with a separation of 31 and 124 mas at two epochs. Optical and near-IR photometry give a set of possible binary components. Consistency of all data indicates that the binary is a pair of DA stars with temperatures near 8000 and 7400 K and with masses of 0.93 and 0.91 M_solar; also possible, is a DA primary and a helium DC secondary with temperatures near 8800 and 6000 K and with masses of 0.98 and 0.69 M_solar. In either case, the cooling ages of the stars are ~3 Gyr and the total ages are <4 Gyr. The combined mass of the binary (1.66--1....

  20. The binary white dwarf LHS 3236

    SciTech Connect (OSTI)

    Harris, Hugh C.; Dahn, Conard C.; Canzian, Blaise; Guetter, Harry H.; Levine, Stephen E.; Luginbuhl, Christian B.; Monet, Alice K. B.; Stone, Ronald C.; Subasavage, John P.; Tilleman, Trudy; Walker, Richard L. [US Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, AZ 86001-8521 (United States); Dupuy, Trent J.; Liu, Michael C. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Hartkopf, William I. [US Naval Observatory, 3450 Massachusetts Avenue, N.W., Washington, DC 20392-5420 (United States); Ireland, Michael J. [Department of Physics and Astronomy, Macquarie University, New South Wales, NSW 2109 (Australia); Leggett, S. K., E-mail: hch@nofs.navy.mil [Gemini Observatory, 670 N. Aohoku Place, Hilo, HI 96720 (United States)

    2013-12-10T23:59:59.000Z

    The white dwarf LHS 3236 (WD1639+153) is shown to be a double-degenerate binary, with each component having a high mass. Astrometry at the U.S. Naval Observatory gives a parallax and distance of 30.86 0.25 pc and a tangential velocity of 98 km s{sup 1}, and reveals binary orbital motion. The orbital parameters are determined from astrometry of the photocenter over more than three orbits of the 4.0 yr period. High-resolution imaging at the Keck Observatory resolves the pair with a separation of 31 and 124 mas at two epochs. Optical and near-IR photometry give a set of possible binary components. Consistency of all data indicates that the binary is a pair of DA stars with temperatures near 8000 and 7400 K and with masses of 0.93 and 0.91 M {sub ?}; also possible is a DA primary and a helium DC secondary with temperatures near 8800 and 6000 K and with masses of 0.98 and 0.69 M {sub ?}. In either case, the cooling ages of the stars are ?3 Gyr and the total ages are <4 Gyr. The combined mass of the binary (1.66-1.84 M {sub ?}) is well above the Chandrasekhar limit; however, the timescale for coalescence is long.

  1. Quantitatively Probing the Al Distribution in Zeolites

    SciTech Connect (OSTI)

    Vjunov, Aleksei; Fulton, John L.; Huthwelker, Thomas; Pin, Sonia; Mei, Donghai; Schenter, Gregory K.; Govind, Niranjan; Camaioni, Donald M.; Hu, Jian Z.; Lercher, Johannes A.

    2014-06-11T23:59:59.000Z

    The degree of substitution of Si4+ by Al3+ in the oxygen-terminated tetrahedra (Al T-sites) of zeolites determines the concentration of ion-exchange and Brnsted acid sites. As the location of the tetrahedra and the associated subtle variations in bond angles influence the acid strength, quantitative information about Al T-sites in the framework is critical to rationalize catalytic properties and to design new catalysts. A quantitative analysis is reported that uses a combination of extended X-ray absorption fine structure (EXAFS) analysis and 27Al MAS NMR spectroscopy supported by DFT-based molecular dynamics simulations. To discriminate individual Al atoms, sets of ab initio EXAFS spectra for various T-sites are generated from DFT-based molecular dynamics simulations allowing quantitative treatment of the EXAFS single- and multiple-photoelectron scattering processes out to 3-4 atom shells surrounding the Al absorption center. It is observed that identical zeolite types show dramatically different Al-distributions. A preference of Al for T-sites that are part of one or more 4-member rings in the framework over those T-sites that are part of only 5- and 6-member rings in the HBEA150 sample has been determined from a combination of these methods. This work was supported by the U. S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences & Biosciences.

  2. On the Criticality Safety of Transuranic Sodium Fast Reactor Fuel Transport Casks

    SciTech Connect (OSTI)

    Samuel Bays; Ayodeji Alajo

    2010-05-01T23:59:59.000Z

    This work addresses the neutronic performance and criticality safety issues of transport casks for fuel pertaining to low conversion ratio sodium cooled fast reactors, conventionally known as Advanced Burner Reactors. The criticality of a one, three, seven and 19-assembly cask capacity is presented. Both dry helium and flooded water filled casks are considered. No credit for fuel burnup or fission products was assumed. As many as possible of the conservatisms used in licensing light water reactor universal transport casks were incorporated into this SFR cask criticality design and analysis. It was found that at 7-assemblies or more, adding moderator to the SFR cask increases criticality margin. Also, removal of MAs from the fuel increases criticality margin of dry casks and takes a slight amount of margin away for wet casks. Assuming credit for borated fuel tube liners, this design analysis suggests that as many as 19 assemblies can be loaded in a cask if limited purely by criticality safety. If no credit for boron is assumed, the cask could possibly hold seven assemblies if low conversion ratio fast reactor grade fuel and not breeder reactor grade fuel is assumed. The analysis showed that there is a need for new cask designs for fast reactors spent fuel transportation. There is a potential of modifying existing transportation cask design as the starting point for fast reactor spent fuel transportation.

  3. Preparation of hexagonal WO{sub 3} from hexagonal ammonium tungsten bronze for sensing NH{sub 3}

    SciTech Connect (OSTI)

    Szilagyi, Imre Miklos [Materials Structure and Modeling Research Group of the Hungarian Academy of Sciences, Budapest University of Technology and Economics, H-1111 Budapest, Szt. Gellert ter 4 (Hungary)], E-mail: imre.szilagyi@mail.bme.hu; Wang Lisheng; Gouma, Pelagia-Irene [Department of Materials Science and Engineering, 314 Old Engineering Building, SUNY, Stony Brook, NY 11794-2275 (United States); Balazsi, Csaba [Ceramics and Nanocomposites Laboratory, Research Institute for Technical Physics and Materials Science, H-1121 Budapest, Konkoly-Thege ut 29-33 (Hungary); Madarasz, Janos; Pokol, Gyoergy [Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, H-1111 Budapest, Szt. Gellert ter 4 (Hungary)

    2009-03-05T23:59:59.000Z

    Hexagonal tungsten oxide (h-WO{sub 3}) was prepared by annealing hexagonal ammonium tungsten bronze, (NH{sub 4}){sub 0.07}(NH{sub 3}){sub 0.04}(H{sub 2}O){sub 0.09}WO{sub 2.95}. The structure, composition and morphology of h-WO{sub 3} were studied by XRD, XPS, Raman, {sup 1}H MAS (magic angle spinning) NMR, scanning electron microscopy (SEM), and BET-N{sub 2} specific surface area measurement, while its thermal stability was investigated by in situ XRD. The h-WO{sub 3} sample was built up by 50-100 nm particles, had an average specific surface area of 8.3 m{sup 2}/g and was thermally stable up to 450 deg. C. Gas sensing tests showed that h-WO{sub 3} was sensitive to various levels (10-50 ppm) of NH{sub 3}, with the shortest response and recovery times (1.3 and 3.8 min, respectively) to 50 ppm NH{sub 3}. To this NH{sub 3} concentration, the sensor had significantly higher sensitivity than h-WO{sub 3} samples prepared by wet chemical methods.

  4. X-ray analysis of the proper motion and pulsar wind nebula for PSR J1741-2054

    E-Print Network [OSTI]

    Auchettl, Katie; Romani, Roger W; Posselt, Bettina; Pavlov, George G; Kargaltsev, Oleg; Ng, C-Y; Temim, Tea; Weisskopf, Martin C; Bykov, Andrei; Swartz, Douglas A

    2015-01-01T23:59:59.000Z

    We obtained six observations of PSR J1741-2054 using the $Chandra$ ACIS-S detector totaling $\\sim$300 ks. By registering this new epoch of observations to an archival observation taken 3.2 years earlier using X-ray point sources in the field of view, we have measured the pulsar proper motion at $\\mu =109 \\pm 10$ mas/yr. The spectrum of the pulsar can be described by an absorbed power law with photon index $\\Gamma$=2.68$\\pm$0.04, plus a blackbody with an emission radius of (4.5$^{+3.2}_{-2.5})d_{0.38}$ km, for a DM-estimated distance of $0.38d_{0.38}$ kpc and a temperature of $61.7\\pm3.0$ eV. Emission from the compact nebula is well described by an absorbed power law model with a photon index of $\\Gamma$ = 1.67$\\pm$0.06, while the diffuse emission seen as a trail extending northeast of the pulsar shows no evidence of synchrotron cooling. We also looked for extended features that might represent a jet or torus-like structure using image deconvolution and PSF-subtraction but we find no conclusive evidence of suc...

  5. BEER analysis of Kepler and CoRoT light curves: I. Discovery of a hot Jupiter with superrotation evidence in Kepler data

    E-Print Network [OSTI]

    Faigler, Simchon; Mazeh, Tsevi; Latham, Dave W; Buchhave, Lars A

    2013-01-01T23:59:59.000Z

    We present the first case in which the BEER algorithm identified a hot Jupiter in the Kepler light curve, and its reality was confirmed by orbital solutions based on follow-up spectroscopy. The companion KIC 4570949b was identified by the BEER algorithm, which detected the BEaming (sometimes called Doppler boosting) effect together with the Ellipsoidal and Reflection/emission modulations (BEER), at an orbital period of 1.54 days, suggesting a planetary companion orbiting the 13.3 mag F star. Further investigation revealed that this star appeared in the Kepler eclipsing binary catalog with estimated primary and secondary eclipse depths of 5e-3 and 1e-4 respectively. Spectroscopic radial-velocity follow-up observations with TRES and SOPHIE confirmed KIC 4570949b as a transiting 2.0+/-0.26 Mjup hot Jupiter. The mass of a transiting planet can be estimated from either the beaming or the ellipsoidal amplitude. The ellipsoidal-based mass estimate of KIC 4570949b is consistent with the spectroscopically measured mas...

  6. Coal thermolysis modeling: The effect of cross-linking on the thermal decomposition of 1,3-diphenylpropane

    SciTech Connect (OSTI)

    Britt, P.F.; Buchanan, A.C. III.; Hagaman, E.W.; Biggs, C.A. (Oak Ridge National Lab., TN (United States))

    1990-08-01T23:59:59.000Z

    In an effort to model the effects of restricted diffusion and cross-linking on the thermal decomposition of polymethylene units linking aromatic moieties in coal, a surface-attached, cross-linked 1,3-diphenylpropane has been synthesized through the condensation of p, p{prime}-HOPh(CH{sub 2}){sub 3}PhOH with a silica surface. Thermolysis of DPP at 375 C has been studied at a variety of surface coverages in which the fraction of diattached DPP varies from ca. 24 to 86% with complete diattachment not yet achieved. The influence of cross-linking and free phenolic functionality (Ph(CH{sub 2}){sub 3}PhOH) on the rate of decomposition and product distribution will be discussed and compared to the thermolysis of Ph(CH{sub 2}){sub 3}Ph as well as fluid phase DPP. Solid state CP/MAS {sup 13}C NMR will be used to prove the chemical composition and motional behavior of the substrate on the surface and their potential mechanistic impact.

  7. The unusual quadruple system HD 91962 with a "planetary" architecture

    E-Print Network [OSTI]

    Tokovinin, Andrei; Mason, Brian D

    2015-01-01T23:59:59.000Z

    The young nearby solar-type star HD 91962 is a rare quadruple system where three companions revolve around the main component with periods of 170.3 days, 8.85 years, and 205 years. The two outer orbits are nearly co-planar, and all orbits have small eccentricities. We refine the visual orbit of the outer pair, determine the combined spectro-interferometric orbit of the middle 8.8-yr pair and the spectroscopic orbit of the inner binary. The middle and inner orbits are likely locked in a 1:19 resonance, the ratio of the outer and middle periods is ~23. The masses of all components are estimated (inside-out: 1.14, 0.32, 0.64, 0.64 solar mass), the dynamical parallax is 27.4+-0.6 mas. We speculate that this multiple system originated from collapse of an isolated core and that the companions migrated in a dissipative disk. Other multiple systems with similar features (coplanarity, small eccentricity, and period ratio around 20) are known.

  8. NEAT, An Astrometric Telescope To Probe Planetary Systems Down To The Earth Mass Around Nearby Solar-Type Stars

    E-Print Network [OSTI]

    Malbet, F; Goullioud, R; Shao, M; Lagage, P -O; Cara, C; Durand, G; Feautrier, P; Jakobsson, B; Hinglais, E; Mercier, M

    2011-01-01T23:59:59.000Z

    The NEAT (Nearby Earth Astrometric Telescope) mission is a proposition submitted to ESA for its 2010 call for M-size mission. The main scientific goal is to detect and characterize planetary systems in an exhaustive way down to 1 Earth mass in the habitable zone and further away, around nearby stars for F, G, and K spectral types. This survey would provide the actual planetary masses, the full characterization of the orbits including their inclination, for all the components of the planetary system down to that mass limit. Extremely- high-precision astrometry, in space, can detect the dynamical effect due to even low mass orbiting planets on their central star, reaching those scientific goals. NEAT will continue the work performed by Hipparcos (1mas precision) and Gaia (7{\\mu}as aimed) by reaching a precision that is improved by two orders of magnitude (0.05{\\mu}as, 1{\\sigma} accuracy). The two modules of the payload, the telescope and the focal plane, must be placed 40m away leading to a formation flying opt...

  9. Revealing {\\delta} Cephei's Secret Companion and Intriguing Past

    E-Print Network [OSTI]

    Anderson, Richard I; Holl, Berry; Eyer, Laurent; Palaversa, Lovro; Mowlavi, Nami; Sveges, Maria; Roelens, Maroussia

    2015-01-01T23:59:59.000Z

    Classical Cepheid variable stars are crucial calibrators of the cosmic distance scale thanks to a relation between their pulsation periods and luminosities. Their archetype, {\\delta} Cephei, is an important calibrator for this relation. In this paper, we show that {\\delta} Cephei is a spectroscopic binary based on newly-obtained high-precision radial velocities. We combine these new data with literature data to determine the orbit, which has period 2201 days, semi-amplitude 1.5 km/s, and high eccentricity (e = 0.647). We re-analyze Hipparcos intermediate astrometric data to measure {\\delta} Cephei's parallax ($\\varpi = 4.09 \\pm 0.16$ mas) and find tentative evidence for an orbital signature, although we cannot claim detection. We estimate that Gaia will fully determine the astrometric orbit. Using the available information from spectroscopy, velocimetry, astrometry, and Geneva stellar evolution models ($M_{\\delta Cep} ~ 5.0 - 5.25 M_\\odot$), we constrain the companion mass to within $0.2 < M_2 < 1.2 M_\\...

  10. Una revisi\\'on a la teor\\'ia b\\'asica del CMB (A review of the basic theory of CMB)

    E-Print Network [OSTI]

    Mastache, Jorge

    2014-01-01T23:59:59.000Z

    Spanish: La Cosmolog\\'ia esta progresando a pasos agigantados gracias a la cantidad espectacular de datos observacionales que se obtienen tanto de los experimentos en tierra como sat\\'elites. Un papel fundamental es desempe\\~ndo por las observaciones del Fondo C\\'osmico de Microondas (CMB por sus siglas en ingl\\'e, Cosmic Microwave Background), la cual nos proporciona la prueba observacional m\\'as directa de los inicios del Universo. Las observaciones de la temperatura y las anisotrop\\'ias en el CMB han jugado un papel fundamental en la definici\\'on del modelo cosmol\\'ogico. Esta contribuci\\'on tiene como objetivo resumir algunos de los conceptos b\\'asicos que hay detr\\'as de la f\\'isica del CMB. La mayor parte de los ingredientes del modelo cosmol\\'ogico est\\'andar son poco conocidos en t\\'erminos de la f\\'isica fundamental, por efemplo, la materia oscura y la energ\\'ia oscura. Se discute c\\'omo las observaciones actuales abordan algunas de estas cuestiones. English: The cosmic microwave background (CMB) pro...

  11. Ground-Based CCD Astrometry with Wide Field Imagers. I. [Observations just a few years apart allow decontamination of field objects from members in two Globular clusters.

    E-Print Network [OSTI]

    Jay Anderson; Luigi R. Bedin; Giampaolo Piotto; Ramakant Singh Yadav; Andrea Bellini; .

    2006-04-26T23:59:59.000Z

    This paper is the first of a series of papers in which we will apply the methods we have developed for high-precision astrometry (and photometry) with the Hubble Space Telescope to the case of wide-field ground-based images. In particular, we adapt the software originally developed for WFPC2 to ground-based, wide field images from the WFI at the ESO 2.2m telescope. In this paper, we describe in details the new software, we characterize the WFI geometric distortion, discuss the adopted local transformation approach for proper-motion measurements, and apply the new technique to two-epoch archive data of the two closest Galactic globular clusters: NGC 6121 (M4) and NGC 6397. The results of this exercise are more than encouraging. We find that we can achieve a precision of ~7 mas (in each coordinate) in a single exposure for a well-exposed star, which allows a very good cluster-field separation in both M4, and NGC 6397, with a temporal baseline of only 2.8, and 3.1 years, respectively.

  12. Ground-Based CCD Astrometry with Wide Field Imagers. I. [Observations just a few years apart allow decontamination of field objects from members in two Globular clusters.

    E-Print Network [OSTI]

    Anderson, J; Bellini, A; Piotto, G; Yadav, R S; Anderson, Jay; Bedin, Luigi R.; Bellini, Andrea; Piotto, Giampaolo; Yadav, Ramakant Singh

    2006-01-01T23:59:59.000Z

    This paper is the first of a series of papers in which we will apply the methods we have developed for high-precision astrometry (and photometry) with the Hubble Space Telescope to the case of wide-field ground-based images. In particular, we adapt the software originally developed for WFPC2 to ground-based, wide field images from the WFI at the ESO 2.2m telescope. In this paper, we describe in details the new software, we characterize the WFI geometric distortion, discuss the adopted local transformation approach for proper-motion measurements, and apply the new technique to two-epoch archive data of the two closest Galactic globular clusters: NGC 6121 (M4) and NGC 6397. The results of this exercise are more than encouraging. We find that we can achieve a precision of ~7 mas (in each coordinate) in a single exposure for a well-exposed star, which allows a very good cluster-field separation in both M4, and NGC 6397, with a temporal baseline of only 2.8, and 3.1 years, respectively.

  13. A diversity of dusty AGN tori: Data release for the VLTI/MIDI AGN Large Program and first results for 23 galaxies

    E-Print Network [OSTI]

    Burtscher, Leonard; Tristram, Konrad R W; Jaffe, Walter; Hnig, Sebastian F; Davies, Richard I; Kishimoto, Makoto; Pott, Jrg-Uwe; Rttgering, Huub; Schartmann, Marc; Weigelt, Gerd; Wolf, Sebastian

    2013-01-01T23:59:59.000Z

    The AGN-heated dust distribution (the "torus") is increasingly recognized not only as the absorber required in unifying models, but as a tracer for the reservoir that feeds the nuclear Super-Massive Black Hole. Yet, even its most basic structural properties (such as its extent, geometry and elongation) are unknown for all but a few archetypal objects. Since most AGNs are unresolved in the mid-infrared, we utilize the MID-infrared interferometric Instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) that is sensitive to structures as small as a few milli-arcseconds (mas). We present here an extensive amount of new interferometric observations from the MIDI AGN Large Program (2009 - 2011) and add data from the archive to give a complete view of the existing MIDI observations of AGNs. Additionally, we have obtained high-quality mid-infrared spectra from VLT/VISIR. We present correlated and total flux spectra for 23 AGNs and derive flux and size estimates at 12 micron using simple axisymmetric geome...

  14. Dust emission from a parsec-scale structure in the Seyfert 1 nucleus of NGC 4151

    E-Print Network [OSTI]

    Burtscher, Leonard; Raban, David; Meisenheimer, Klaus; Tristram, Konrad R W; Rttgering, Huub

    2009-01-01T23:59:59.000Z

    We report mid-IR interferometric measurements with \\sim 10 mas resolution, which resolve the warm (T = 285 +25 / -50 K) thermal emission at the center of NGC 4151. Using pairs of VLT 8.2 m telescopes with MIDI and by comparing the data to a Gaussian model, we determined the diameter of the dust emission region, albeit only along one position angle, to be 2.0 +/- 0.4 pc (FWHM). This is the first size and temperature estimate for the nuclear warm dust distribution in a Seyfert 1 galaxy. The parameters found are comparable to those in Seyfert 2 galaxies, thus providing direct support for the unified model. Using simple analytic temperature distributions, we find that the mid-infrared emission is probably not the smooth continuation of the hot nuclear source that is marginally resolved with K band interferometry. We also detected weak excess emission around 10.5 micron in our shorter baseline observation, possibly indicating that silicate emission is extended to the parsec scale.

  15. A New Merging Double Degenerate Binary in the Solar Neighborhood

    E-Print Network [OSTI]

    Debes, John H; Tremblay, Pier-Emmanuel; Lpez-Morales, Mercedes; Anglada-Escud, Guillem; Napiwotzki, Ralf; Osip, David; Weinberger, Alycia

    2015-01-01T23:59:59.000Z

    Characterizing the local space density of double degenerate binary systems is a complementary approach to broad sky surveys of double degenerates to determine the expected rates of white dwarf binary mergers, in particular those that may evolve into other observable phenomena such as extreme helium stars, Am CVn systems, and supernovae Ia. However, there have been few such systems detected in local space. We report here the discovery that WD 1242$-$105, a nearby bright WD, is a double-line spectroscopic binary consisting of two degenerate DA white dwarfs of similar mass and temperature, despite it previously having been spectroscopically characterized as a single degenerate. Follow-up photometry, spectroscopy, and trigonometric parallax have been obtained in an effort to determine the fundamental parameters of each component of this system. The binary has a mass ratio of 0.7 and a trigonometric parallax of 25.5 mas, placing it at a distance of 39 pc. The system's total mass is 0.95 M$_\\odot$ and has an orbita...

  16. Advance Resource Provisioning in Bulk Data Scheduling

    SciTech Connect (OSTI)

    Balman, Mehmet

    2012-10-01T23:59:59.000Z

    Today?s scientific and business applications generate mas- sive data sets that need to be transferred to remote sites for sharing, processing, and long term storage. Because of increasing data volumes and enhancement in current net- work technology that provide on-demand high-speed data access between collaborating institutions, data handling and scheduling problems have reached a new scale. In this paper, we present a new data scheduling model with ad- vance resource provisioning, in which data movement operations are defined with earliest start and latest comple- tion times. We analyze time-dependent resource assign- ment problem, and propose a new methodology to improve the current systems by allowing researchers and higher-level meta-schedulers to use data-placement as-a-service, so they can plan ahead and submit transfer requests in advance. In general, scheduling with time and resource conflicts is NP-hard. We introduce an efficient algorithm to organize multiple requests on the fly, while satisfying users? time and resource constraints. We successfully tested our algorithm in a simple benchmark simulator that we have developed, and demonstrated its performance with initial test results.

  17. Fluorine-Containing ABC Linear Triblock Terpolymers: Synthesis and Self-assembly in Solution

    SciTech Connect (OSTI)

    He, Lihong [ORNL; Hinestrosa Salazar, Juan P [ORNL; Pickel, Joseph M [ORNL; Kilbey, II, S Michael [ORNL; Mays, Jimmy [ORNL; Zhang, Shanju [Georgia Institute of Technology; Bucknall, David G. [Georgia Institute of Technology; Hong, Kunlun [ORNL

    2011-01-01T23:59:59.000Z

    In this paper a fluorine-containing monomer, 2-fluroroethyl methacrylate (2FEMA) was used to synthesize the linear triblock terpolymer poly(n-butyl methacrylate)-poly(methyl methacrylate)-poly(2-fluoroethyl methacrylate) (PnBMA-PMMA-P2FEMA). A kinetic study of the homopolymerization of 2FEMA by reversible addition-fragmentation chain transfer (RAFT) polymerization showed that it demonstrates living character and produces well defined polymers with reasonably narrow polydispersities (~1.30). Triblock terpolymers were prepared sequentially using a purified Macro-CTA at 70 oC, resulting in final terpolymers with high Dp for each block (>150) and with polydispersities between 1.6 and 2.1. The structure and molecular weights of the resultant PnBMA-PMMA-P2FEMA triblock terpolymers were characterized via 1H NMR, 19F NMR, and gel permeation chromatography (GPC). Self-assembly of these polymers was carried out in a selective solvent and the micellar aggregates (MAs) thereby formed were analyzed using scanning electron microscopy (SEM) and dynamic light scattering (DLS). It was confirmed from SEM that these copolymers could directly self-organize into large compound micelles in tetrahydrofuran/methanol with different diameters, depending on polymer composition.

  18. An ancient F-type subdwarf from the halo crossing the Galactic plane

    E-Print Network [OSTI]

    Scholz, R -D; Heuser, C; Ziegerer, E; Geier, S; Niederhofer, F

    2015-01-01T23:59:59.000Z

    AIMS: We selected the bluest object, WISE~J0725$-$2351, from Luhman's new high proper motion (HPM) survey based on observations with the Wide-field Infrared Survey Explorer (WISE) for spectroscopic follow-up observations. Our aim was to unravel the nature of this relatively bright ($V$$\\sim$12, $J$$\\sim$11) HPM star ($\\mu$$=$267\\,mas/yr). METHODS: We obtained low- and medium-resolution spectra with the European Southern Observatory (ESO) New Technology Telescope (NTT)/EFOSC2 and Very Large Telescope (VLT)/XSHOOTER instruments, investigated the radial velocity and performed a quantitative spectral analysis that allowed us to determine physical parameters. The fit of the spectral energy distribution based on the available photometry to low-metallicity model spectra and the similarity of our target to a metal-poor benchmark star (HD~84937) allowed us to estimate the distance and space velocity. RESULTS: As in the case of HD~84937, we classified WISE~J0725$-$2351 as sdF5: or a metal-poor turnoff star with $[Fe/H]...

  19. Advanced slow-magic angle spinning probe for magnetic resonance imaging and spectroscopy

    DOE Patents [OSTI]

    Wind, Robert A.; Hu, Jian Zhi; Minard, Kevin R.; Rommereim, Donald N.

    2006-01-24T23:59:59.000Z

    The present invention relates to a probe and processes useful for magnetic resonance imaging and spectroscopy instruments. More particularly, the invention relates to a MR probe and processes for obtaining resolution enhancements of fluid objects, including live specimens, using an ultra-slow (magic angle) spinning (MAS) of the specimen combined with a modified phase-corrected magic angle turning (PHORMAT) pulse sequence. Proton NMR spectra were measured of the torso and the top part of the belly of a female BALBc mouse in a 2T field, while spinning the animal at a speed of 1.5 Hz. Results show that even in this relatively low field with PHORMAT, an isotropic spectrum is obtained with line widths that are a factor 4.6 smaller than those obtained in a stationary mouse. Resolution of 1H NMR metabolite spectra are thus significantly enhanced. Results indicate that PHORMAT has the potential to significantly increase the utility of 1H NMR spectroscopy for in vivo biochemical, biomedical and/or medical applications involving large-sized biological objects such as mice, rats and even humans within a hospital setting. For small-sized objects, including biological objects, such as excised tissues, organs, live bacterial cells, and biofilms, use of PASS at a spinning rate of 30 Hz and above is preferred.

  20. Circumstellar material in the Vega inner system revealed by CHARA/FLUOR

    E-Print Network [OSTI]

    Absil, O; Augereau, J C; Berger, D H; Brummelaar, T A; Folco, E; Foresto, V C; Kervella, P; McAlister, H A; Merand, A; Ridgway, S T; Sturmann, J; Sturmann, L; Turner, N H

    2006-01-01T23:59:59.000Z

    Only a handful of debris disks have been imaged up to now. Due to the need for high dynamic range and high angular resolution, very little is known about the inner planetary region, where small amounts of warm dust are expected to be found. We investigate the close neighbourhood of Vega with the help of infrared stellar interferometry and estimate the integrated K-band flux originating from the central 8 AU of the debris disk. We performed precise visibility measurements at both short (~30 m) and long (~150 m) baselines with the FLUOR beam-combiner installed at the CHARA Array (Mt Wilson, California) in order to separately resolve the emissions from the extended debris disk (short baselines) and from the stellar photosphere (long baselines). After revising Vega's K-band angular diameter (3.202+/-0.005 mas), we show that a significant deficit in squared visibility (1.88+/-0.34%) is detected at short baselines with respect to the best-fit uniform disk stellar model. This deficit can be either attributed to the ...

  1. New hypodiphosphates of the alkali metals: Synthesis, crystal structure and vibrational spectra of the hypodiphosphates(IV) M{sub 2}[(H{sub 2}P{sub 2}O{sub 6})(H{sub 4}P{sub 2}O{sub 6})] (M=Rb and Cs)

    SciTech Connect (OSTI)

    Wu, Peng [Institut fuer Anorganische und Analytische Chemie der TU Clausthal, Paul-Ernst-Strasse 4, D-38678 Clausthal-Zellerfeld (Germany)] [Institut fuer Anorganische und Analytische Chemie der TU Clausthal, Paul-Ernst-Strasse 4, D-38678 Clausthal-Zellerfeld (Germany); Wiegand, Thomas; Eckert, Hellmut [Institut fuer Physikalische Chemie and Graduate School of Chemistry, Westfaelische Wilhelms-Universitaet Muenster, Corrensstr. 28/30, D-48149 Muenster (Germany)] [Institut fuer Physikalische Chemie and Graduate School of Chemistry, Westfaelische Wilhelms-Universitaet Muenster, Corrensstr. 28/30, D-48149 Muenster (Germany); Gjikaj, Mimoza, E-mail: mimoza.gjikaj@tu-clausthal.de [Institut fuer Anorganische und Analytische Chemie der TU Clausthal, Paul-Ernst-Strasse 4, D-38678 Clausthal-Zellerfeld (Germany)] [Institut fuer Anorganische und Analytische Chemie der TU Clausthal, Paul-Ernst-Strasse 4, D-38678 Clausthal-Zellerfeld (Germany)

    2012-10-15T23:59:59.000Z

    The new hypodiphosphates(IV) Rb{sub 2}[(H{sub 2}P{sub 2}O{sub 6})(H{sub 4}P{sub 2}O{sub 6})] (1) and Cs{sub 2}[(H{sub 2}P{sub 2}O{sub 6})(H{sub 4}P{sub 2}O{sub 6})] (2) were synthesized by soft chemistry reactions from aqueous solutions of hypophosphoric acid and the corresponding heavy alkali-metal carbonates. Their crystal structures were determined by single crystal X-ray diffraction. Both compounds crystallize isotypic in the triclinic space group P-1 with one formula unit in the unit cell. The structures are built up by discrete (H{sub 2}P{sub 2}O{sub 6}){sup 2-} and (H{sub 4}P{sub 2}O{sub 6}) units in staggered conformation for the P{sub 2}O{sub 6} skeleton and the corresponding alkali-metal cations. In the (H{sub 2}P{sub 2}O{sub 6}){sup 2-} ion the hydrogen atoms are in a 'trans-trans' conformation. O{center_dot}H-O hydrogen bonds between the (H{sub 2}P{sub 2}O{sub 6}){sup 2-} and (H{sub 4}P{sub 2}O{sub 6}) groups consolidate the structures into a three-dimensional network. The FT-Raman and {sup 31}P and {sup 1}H and MAS NMR spectra of the title compounds have been recorded and interpreted, especially with respect to their assignment to the (H{sub 2}P{sub 2}O{sub 6}){sup 2-} and (H{sub 4}P{sub 2}O{sub 6}) groups. Thermogravimetric data of 2 have been interpreted in terms of a thermal decomposition model. - Graphical Abstract: The layered compounds Rb{sub 2}[(H{sub 2}P{sub 2}O{sub 6})(H{sub 4}P{sub 2}O{sub 6})] and Cs{sub 2}[(H{sub 2}P{sub 2}O{sub 6})(H{sub 4}P{sub 2}O{sub 6})] have been synthesized and investigated. Both crystallize isotypic. The structures are built up by discrete (H{sub 2}P{sub 2}O{sub 6}){sup 2-} and (H{sub 4}P{sub 2}O{sub 6}) units and the corresponding alkali-metal cations. Highlights: Black-Right-Pointing-Pointer Synthesis and single-crystal structure of new alkali hypodiphosphates. Black-Right-Pointing-Pointer Structures are characterized by [(H{sub 2}P{sub 2}O{sub 6})(H{sub 4}P{sub 2}O{sub 6})]{sup 2-} units and M{sup +} cations. Black-Right-Pointing-Pointer (H{sub 2}P{sub 2}O{sub 6}){sup 2-} and (H{sub 4}P{sub 2}O{sub 6}) units are linked by short hydrogen bonds. Black-Right-Pointing-Pointer Both compounds are characterized by {sup 31}P MAS-NMR spectra.

  2. Statistical model based iterative reconstruction (MBIR) in clinical CT systems: Experimental assessment of noise performance

    SciTech Connect (OSTI)

    Li, Ke; Tang, Jie [Department of Medical Physics, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705 (United States)] [Department of Medical Physics, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705 (United States); Chen, Guang-Hong, E-mail: gchen7@wisc.edu [Department of Medical Physics, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705 and Department of Radiology, University of Wisconsin-Madison, 600 Highland Avenue, Madison, Wisconsin 53792 (United States)] [Department of Medical Physics, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, Wisconsin 53705 and Department of Radiology, University of Wisconsin-Madison, 600 Highland Avenue, Madison, Wisconsin 53792 (United States)

    2014-04-15T23:59:59.000Z

    Purpose: To reduce radiation dose in CT imaging, the statistical model based iterative reconstruction (MBIR) method has been introduced for clinical use. Based on the principle of MBIR and its nonlinear nature, the noise performance of MBIR is expected to be different from that of the well-understood filtered backprojection (FBP) reconstruction method. The purpose of this work is to experimentally assess the unique noise characteristics of MBIR using a state-of-the-art clinical CT system. Methods: Three physical phantoms, including a water cylinder and two pediatric head phantoms, were scanned in axial scanning mode using a 64-slice CT scanner (Discovery CT750 HD, GE Healthcare, Waukesha, WI) at seven different mAs levels (5, 12.5, 25, 50, 100, 200, 300). At each mAs level, each phantom was repeatedly scanned 50 times to generate an image ensemble for noise analysis. Both the FBP method with a standard kernel and the MBIR method (Veo{sup }, GE Healthcare, Waukesha, WI) were used for CT image reconstruction. Three-dimensional (3D) noise power spectrum (NPS), two-dimensional (2D) NPS, and zero-dimensional NPS (noise variance) were assessed both globally and locally. Noise magnitude, noise spatial correlation, noise spatial uniformity and their dose dependence were examined for the two reconstruction methods. Results: (1) At each dose level and at each frequency, the magnitude of the NPS of MBIR was smaller than that of FBP. (2) While the shape of the NPS of FBP was dose-independent, the shape of the NPS of MBIR was strongly dose-dependent; lower dose lead to a redder NPS with a lower mean frequency value. (3) The noise standard deviation (?) of MBIR and dose were found to be related through a power law of ????(dose){sup ??} with the component ? ? 0.25, which violated the classical ????(dose){sup ?0.5} power law in FBP. (4) With MBIR, noise reduction was most prominent for thin image slices. (5) MBIR lead to better noise spatial uniformity when compared with FBP. (6) A composite image generated from two MBIR images acquired at two different dose levels (D1 and D2) demonstrated lower noise than that of an image acquired at a dose level of D1+D2. Conclusions: The noise characteristics of the MBIR method are significantly different from those of the FBP method. The well known tradeoff relationship between CT image noise and radiation dose has been modified by MBIR to establish a more gradual dependence of noise on dose. Additionally, some other CT noise properties that had been well understood based on the linear system theory have also been altered by MBIR. Clinical CT scan protocols that had been optimized based on the classical CT noise properties need to be carefully re-evaluated for systems equipped with MBIR in order to maximize the method's potential clinical benefits in dose reduction and/or in CT image quality improvement.

  3. Full differentiation and assignment of boron species in the electrolytes Li{sub 2}B{sub 6}O{sub 9}F{sub 2} and Li{sub 2}B{sub 3}O{sub 4}F{sub 3} by solid-state {sup 11}B NMR spectroscopy

    SciTech Connect (OSTI)

    Braeuniger, Thomas, E-mail: T.Braeuniger@fkf.mpg.de [Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart (Germany)] [Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart (Germany); Pilz, Thomas; Chandran, C. Vinod; Jansen, Martin [Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart (Germany)] [Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart (Germany)

    2012-10-15T23:59:59.000Z

    The syntheses of two new fluorooxoborates, Li{sub 2}B{sub 3}O{sub 4}F{sub 3} and Li{sub 2}B{sub 6}O{sub 9}F{sub 2}, which possess considerable ion conductivity at higher temperatures, have been reported recently. Here, we describe the characterisation of these compounds by solid-state {sup 11}B NMR spectroscopy. The complex central-transition MAS spectra, resulting from overlap of sub-spectra contributed by the individual boron species in the crystal structures, could be clearly separated by acquisition and analysis of 3QMAS spectra. By numerical fit of these sub-spectra, the isotropic chemical shift {delta}{sub iso}, the quadrupolar coupling constant {chi}, and the asymmetry {eta} were determined. Using known relations between boron coordination and chemical shift as well as quadrupolar coupling, the individual {sup 11}B NMR resonances have been ascribed to boron species in tetrahedral or trigonal environment. To remove remaining assignment ambiguities, the response of the {sup 11}B resonances to {sup 19}F decoupling was qualitatively analysed. Thus, by using the combined information conveyed by chemical shift, quadrupolar and dipolar interaction, a complete assignment of the complex {sup 11}B line shapes exhibited by the fluorooxoborates has been achieved. - Graphical abstract: Structure and solid-state {sup 11}B NMR spectrum of Li{sub 2}B{sub 3}O{sub 4}F{sub 3}. Highlights: Black-Right-Pointing-Pointer Characterisation of title compounds by solid-state {sup 11}B NMR spectroscopy. Black-Right-Pointing-Pointer Sub-spectra of boron species separated by evaluation of 3QMAS spectra. Black-Right-Pointing-Pointer Isotropic chemical shift and quadrupolar interaction parameters determined. Black-Right-Pointing-Pointer Full boron assignment based on NMR parameters and response to {sup 19}F decoupling.

  4. SU-E-I-88: Mammography Imaging: Does Positioning Matter?

    SciTech Connect (OSTI)

    Zhang, J; Szabunio, M [University of Kentucky, Lexington, KY (United States)

    2014-06-01T23:59:59.000Z

    Purpose: In mammography, compression is imperative for quality images and glandular radiation exposure dose. The thickness of the compressed breast directly determines mammography acquisition parameters. The compressed thickness varies due to variation in technologist practice, even for the same patient imaged at different time. This study is to investigate potential effect of the variation in breast positioning on radiation dose and image quality. Methods: Radiation dose at different thicknesses was measured with a BR-12 breast phantom for both conventional craniocaudal view and tomosynthesis in a Hologic Tomosynthesis mammography system. The CIRS stereotactic needle biopsy training phantom embedded dense masses and microcalcification in various sizes were imaged for image quality evaluation. Radiologists evaluated images. Clinical mammograms from the same patient but acquired at different time were retrospectively retrieved to evaluate potential effects of variation in positioning. Results: Acquisition parameters (kVp and mAs) increase with the increased phantom thickness. Radiation exposure increases following an exponential trend. The stereotactic phantom images showed loss of spatial and contrast resolution with inappropriate positioning. The compressed pressure may not be a good indicator for appropriate positioning. The inclusion of different amount of pectoralis muscle may lead to the same compressed pressure but different compressed thickness. The initial retrospective study of 3 patients showed that there were potential large variations in positioning the same patient at different examination time, resulting in large variations in patient radiation dose and image quality. Conclusion: Variations in patient positioning potentially influence patient radiation dose and image quality. The technologist has the critical responsibility to position patient to provide quality images in spite of different breast and body types. To reduce intra and inter practice variations in positioning patient, a training program among each breast imaging center may be a need.

  5. A SEARCH FOR HIGH PROPER MOTION T DWARFS WITH Pan-STARRS1 + 2MASS + WISE

    SciTech Connect (OSTI)

    Liu, Michael C.; Deacon, Niall R.; Magnier, Eugene A.; Aller, Kimberly M.; Bowler, Brendan P.; Burgett, W. S.; Chambers, K. C.; Hodapp, K. W.; Kaiser, N.; Kudritzki, R.-P.; Morgan, J. S.; Tonry, J. L.; Wainscoat, R. J. [Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States); Dupuy, Trent J. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Redstone, Joshua [Facebook, Palo Alto, CA 94304 (United States); Goldman, Bertrand [Max Planck Institute for Astronomy, D-69117 Heidelberg (Germany); Price, P. A. [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)

    2011-10-20T23:59:59.000Z

    We have searched {approx}8200 deg{sup 2} for high proper motion ({approx}0.''5-2.''7 year{sup -1}) T dwarfs by combining first-epoch data from the Pan-STARRS1 (PS1) 3{pi} Survey, the Two Micron All Sky Survey (2MASS) All-Sky Point Source Catalog, and the WISE Preliminary Data Release. We identified two high proper motion objects with the very red (W1 - W2) colors characteristic of T dwarfs, one being the known T7.5 dwarf GJ 570D. Near-IR spectroscopy of the other object (PSO J043.5395+02.3995 {identical_to} WISEP J025409.45+022359.1) reveals a spectral type of T8, leading to a photometric distance of 7.2 {+-} 0.7 pc. The 2.''56 year{sup -1} proper motion of PSO J043.5+02 is the second highest among field T dwarfs, corresponding to a tangential velocity of 87 {+-} 8 km s{sup -1}. According to the Besancon galaxy model, this velocity indicates that its galactic membership is probably in the thin disk, with the thick disk an unlikely possibility. Such membership is in accord with the near-IR spectrum, which points to a surface gravity (age) and metallicity typical of the field population. We combine 2MASS, Sloan Digital Sky Survey, WISE, and PS1 astrometry to derive a preliminary parallax of 171 {+-} 45 mas (5.8{sup +2.0} {sub -1.2} pc), the first such measurement using PS1 data. The proximity and brightness of PSO J043.5+02 will facilitate future characterization of its atmosphere, variability, multiplicity, distance, and kinematics. The modest number of candidates from our search suggests that the immediate ({approx}10 pc) solar neighborhood does not contain a large reservoir of undiscovered T dwarfs earlier than about T8.

  6. THE TRENDS HIGH-CONTRAST IMAGING SURVEY. III. A FAINT WHITE DWARF COMPANION ORBITING HD 114174

    SciTech Connect (OSTI)

    Crepp, Justin R. [Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556 (United States); Johnson, John Asher [Department of Planetary Science, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States); Howard, Andrew W. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Marcy, Geoffrey W. [Department of Astronomy, University of California, Berkeley, CA 94720 (United States); Gianninas, Alexandros; Kilic, Mukremin [Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States); Wright, Jason T., E-mail: jcrepp@nd.edu [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)

    2013-09-01T23:59:59.000Z

    The nearby Sun-like star HD 114174 exhibits a strong and persistent Doppler acceleration indicating the presence of an unseen distant companion. We have acquired high-contrast imaging observations of this star using NIRC2 at Keck and report the direct detection of the body responsible for causing the ''trend''. HD 114174 B has a projected separation of 692 {+-} 9 mas (18.1 AU) and is 10.75 {+-} 0.12 mag (contrast of 5 Multiplication-Sign 10{sup -5}) fainter than its host in the K-band, requiring aggressive point-spread function subtraction to identify. Our astrometric time baseline of 1.4 yr demonstrates physical association through common proper motion. We find that the companion has absolute magnitude, M{sub J} = 13.97 {+-} 0.11, and colors, J - K = 0.12 {+-} 0.16 mag. These characteristics are consistent with an Almost-Equal-To T3 dwarf, initially leading us to believe that HD 114174 B was a substellar object. However, a dynamical analysis that combines radial velocity measurements with available imaging data indicates a minimum mass of 0.260 {+-} 0.010 M{sub Sun }. We conclude that HD 114174 B must be a white dwarf. Assuming a hydrogen-rich composition, atmospheric and evolutionary model fits yield an effective temperature T{sub eff} = 8200 {+-} 4000 K, surface gravity log g = 8.90 {+-} 0.02, and cooling age of t{sub c} Almost-Equal-To 3.4 Gyr, which is consistent with the 4.7{sup +2.3}{sub -2.6} Gyr host star isochronal age estimate. HD 114174 B is a benchmark object located only 26.14 {+-} 0.37 pc from the Sun. It may be studied at a level of detail comparable to Sirius and Procyon, and used to understand the link between the mass of white dwarf remnants with that of their progenitors.

  7. Temperature effects on chemical structure and motion in coal. Final report

    SciTech Connect (OSTI)

    Maciel, G.E.

    1996-09-30T23:59:59.000Z

    The objective of this project was to apply recently developed, state-of-the-art nuclear magnetic resonance (NMR) techniques to examine in situ changes in the chemical structure and molecular/macromolecular motion in coal as the temperature is increased above room temperature. Although alterations in the chemical structure of coal have been studied previously by {sup 13}C NMR, using quenched samples, the goal of this project was to examine these chemical structural changes, and changes in molecular/macromolecular mobility that may precede or accompany the chemical changes, at elevated temperatures, using modern {sup 13}C and {sup 1}H NMR techniques, especially {sup 1}H dipolar-dephasing techniques and related experiments pioneered in the laboratory for examining pyridine-saturated coals. This project consisted of the following four primary segments and related efforts on matters relevant to the first four tasks. (1) {sup 1}H NMR characterization of coal structure and mobility as a function of temperature variation over a temperature range (30--240 C) for which substantial chemical transformations were not anticipated. (2) {sup 1}H NMR characterization of coal structure, mobility and conversion as a function of temperature variation over a temperature range (240--500 C) for which chemical transformations of coal are known to occur. (3) {sup 13}C NMR investigation of coal structure/mobility as a function of temperature over a temperature range (30--240 C) for which substantial chemical transformations were not anticipated. (4) {sup 13}C NMR investigation of coal structure, dynamics and conversion as a function of temperature variation over a range (240--500 C) for which chemical transformations of coal are known to occur. (5) Related matters relevant to the first four tasks: (a) {sup 1}H CRAMPS NMR characterization of oil shales and their kerogen concentrates; and (b) improved quantitation in {sup 13}C MAS characterization of coals.

  8. Concurrent Collections (CnC): A new approach to parallel programming

    ScienceCinema (OSTI)

    None

    2011-10-06T23:59:59.000Z

    A common approach in designing parallel languages is to provide some high level handles to manipulate the use of the parallel platform. This exposes some aspects of the target platform, for example, shared vs. distributed memory. It may expose some but not all types of parallelism, for example, data parallelism but not task parallelism.This approach must find a balance between the desire to provide a simple view for the domain expert and provide sufficient power for tuning.This is hard for any given architecture and harder if the language is to apply to a range of architectures. Either simplicity or power is lost. Instead of viewing the language design problem as one of providing the programmer with high level handles, we view the problem as one of designing an interface. On one side of this interface is the programmer (domain expert) who knows the application but needs no knowledge of any aspects of the platform. On the other side of the interface is the performance expert (programmer or program) who demands maximal flexibility for optimizing the mapping to a wide range of target platforms (parallel / serial, shared / distributed, homogeneous / heterogeneous, etc.) but needs no knowledge of the domain. Concurrent Collections (CnC) is based on this separation of concerns. The talk will present CnC and its benefits. About the speaker Kathleen Knobe has focused throughout her career on parallelism especially compiler technology, runtime system design and language design. She worked at Compass (aka Massachusetts Computer Associates) from 1980 to 1991 designing compilers for a wide range of parallel platforms for Thinking Machines, MasPar, Alliant, Numerix, and several government projects. In 1991 she decided to finish her education. After graduating from MIT in 1997, she joined Digital Equipment?s Cambridge Research Lab (CRL). She stayed through the DEC/Compaq/HP mergers and when CRL was acquired and absorbed by Intel. She currently works in the Software and Services Group / Technology Pathfinding and Innovation.

  9. IMAGING DISK DISTORTION OF BE BINARY SYSTEM {delta} SCORPII NEAR PERIASTRON

    SciTech Connect (OSTI)

    Che, X.; Monnier, J. D.; Kraus, S.; Baron, F. [Astronomy Department, University of Michigan, 1034 Dennison Bldg, Ann Arbor, MI 48109-1090 (United States); Tycner, C. [Department of Physics, Central Michigan University, Mount Pleasant, MI 48859 (United States); Zavala, R. T. [US Naval Observatory, Flagstaff Station, 10391 West Naval Observatory Road, Flagstaff, AZ 86001 (United States); Pedretti, E. [European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei Muenchen (Germany); Ten Brummelaar, T.; McAlister, H.; Sturmann, J.; Sturmann, L.; Turner, N. [CHARA Array of Georgia State University, Mount Wilson, CA 91023 (United States); Ridgway, S. T., E-mail: xche@umich.edu [National Optical Astronomy Observatory, NOAO, Tucson, AZ (United States)

    2012-09-20T23:59:59.000Z

    The highly eccentric Be binary system {delta} Sco reached periastron during early 2011 July, when the distance between the primary and secondary was a few times the size of the primary disk in the H band. This opened a window of opportunity to study how the gaseous disks around Be stars respond to gravitational disturbance. We first refine the binary parameters with the best orbital phase coverage data from the Navy Precision Optical Interferometer. Then we present the first imaging results of the disk after the periastron, based on seven nights of five telescope observations with the MIRC combiner at the CHARA array. We found that the disk was inclined 27.{sup 0}6 {+-} 6.{sup 0}0 from the plane of the sky, had a half-light radius of 0.49 mas (2.2 stellar radii), and consistently contributed 71.4% {+-} 2.7% of the total flux in the H band from night to night, suggesting no ongoing transfer of material into the disk during the periastron. The new estimation of the periastron passage is UT 2011 July 3 07:00 {+-} 4:30. Re-analysis of archival VLTI-AMBER interferometry data allowed us to determine the rotation direction of the primary disk, constraining it to be inclined either {approx}119 Degree-Sign or {approx}171 Degree-Sign relative to the orbital plane of the binary system. We also detect inner disk asymmetries that could be explained by spot-like emission with a few percent of the disk total flux moving in Keplerian orbits, although we lack sufficient angular resolution to be sure of this interpretation and cannot yet rule out spiral density waves or other more complicated geometries.

  10. TOWARD A SPECTROSCOPIC CENSUS OF WHITE DWARFS WITHIN 40 pc OF THE SUN

    SciTech Connect (OSTI)

    Limoges, M.-M.; Bergeron, P. [Departement de Physique, Universite de Montreal, C.P. 6128, Succ. Centre-Ville, Montreal, Quebec H3C 3J7 (Canada); Lepine, S., E-mail: limoges@astro.umontreal.ca, E-mail: bergeron@astro.umontreal.ca, E-mail: lepine@amnh.org [Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 1002 (United States)

    2013-05-15T23:59:59.000Z

    We present the preliminary results of a survey aimed at significantly increasing the range and completeness of the local census of spectroscopically confirmed white dwarfs. The current census of nearby white dwarfs is reasonably complete only to about 20 pc of the Sun, a volume that includes around 130 white dwarfs, a sample too small for detailed statistical analyses. This census is largely based on follow-up investigations of stars with very large proper motions. We describe here the basis of a method that will lead to a catalog of white dwarfs within 40 pc of the Sun and north of the celestial equator, thus increasing by a factor of eight the extent of the northern sky census. White dwarf candidates are identified from the SUPERBLINK proper motion database, allowing us to investigate stars down to a proper motion limit {mu} > 40 mas yr{sup -1}, while minimizing the kinematic bias for nearby objects. The selection criteria and distance estimates are based on a combination of color-magnitude and reduced proper motion diagrams. Our follow-up spectroscopic observation campaign has so far uncovered 193 new white dwarfs, among which we identify 127 DA (including 9 DA+dM and 4 magnetic), 1 DB, 56 DC, 3 DQ, and 6 DZ stars. We perform a spectroscopic analysis on a subsample of 84 DAs, and provide their atmospheric parameters. In particular, we identify 11 new white dwarfs with spectroscopic distances within 25 pc of the Sun, including five candidates to the D < 20 pc subset.

  11. WIDE COMPANIONS TO HIPPARCOS STARS WITHIN 67 pc OF THE SUN

    SciTech Connect (OSTI)

    Tokovinin, Andrei [Cerro Tololo Inter-American Observatory, Casilla 603, La Serena (Chile); Lepine, Sebastien, E-mail: atokovinin@ctio.noao.edu, E-mail: lepine@amnh.org [Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States)

    2012-10-01T23:59:59.000Z

    A catalog of common-proper-motion (CPM) companions to stars within 67 pc of the Sun is constructed based on the SUPERBLINK proper-motion survey. It contains 1392 CPM pairs with angular separations 30'' < {rho} < 1800'', relative proper motion between the two components less than 25 mas yr{sup -1}, and magnitudes and colors of the secondaries consistent with those of dwarfs in the (M{sub V} , V - J) diagram. In addition, we list 21 candidate white dwarf CPM companions with separations under 300'', about half of which should be physical. We estimate a 0.31 fraction of pairs with red dwarf companions to be physical systems (about 425 objects), while the rest (mostly wide pairs) are chance alignments. For each candidate companion, the probability of a physical association is evaluated. The distribution of projected separations s of the physical pairs between 2 kAU and 64 kAU follows f(s){proportional_to}s {sup -1.5}, which decreases faster than Oepik's law. We find that solar-mass dwarfs have no less than 4.4% {+-} 0.3% companions with separations larger than 2 kAU, or 3.8% {+-} 0.3% per decade of orbital separation in the 2-16 kAU range. The distribution of mass ratio of those wide companions is approximately uniform in the 0.1 < q < 1.0 range, although we observe a dip at q {approx_equal} 0.5 which, if confirmed, could be evidence of bimodal distribution of companion masses. New physical CPM companions to two exoplanet host stars are discovered.

  12. Discovery of a peculiar Cepheid-like star towards the northern edge of the Small Magellanic Cloud

    E-Print Network [OSTI]

    J. B. Marquette; P. Tisserand; P. Francois; J. P. Beaulieu; V. Doublier; E. Lesquoy; A. Milsztajn; J. Pritchard; A. Schwarzenberg-Czerny; C. Afonso; J. N. Albert; J. Andersen; R. Ansari; E. Aubourg; P. Bareyre; X. Charlot; C. Coutures; R. Ferlet; P. Fouque; J. F. Glicenstein; B. Goldman; A. Gould; D. Graff; M. Gros; J. Haissinski; C. Hamadache; J. de Kat; L. Le Guillou; C. Loup; C. Magneville; E. Maurice; A. Maury; M. Moniez; N. Palanque-Delabrouille; O. Perdereau; Y. R. Rahal; J. Rich; M. Spiro; A. Vidal-Madjar; S. Zylberajch

    2008-05-29T23:59:59.000Z

    For seven years, the EROS-2 project obtained a mass of photometric data on variable stars. We present a peculiar Cepheid-like star, in the direction of the Small Magellanic Cloud, which demonstrates unusual photometric behaviour over a short time interval. We report on data of the photometry acquired by the MARLY telescope and spectroscopy from the EFOSC instrument for this star, called EROS2 J005135-714459(sm0060n13842), which resembles the unusual Cepheid HR 7308. The light curve of our target is analysed using the Analysis of Variance method to determine a pulsational period of 5.5675 days. A fit of time-dependent Fourier coefficients is performed and a search for proper motion is conducted. The light curve exhibits a previously unobserved and spectacular change in both mean magnitude and amplitude, which has no clear theoretical explanation. Our analysis of the spectrum implies a radial velocity of 104 km s$^{-1}$ and a metallicity of -0.4$\\pm$0.2 dex. In the direction of right ascension, we measure a proper motion of 17.4$\\pm$6.0 mas yr$^{-1}$ using EROS astrometry, which is compatible with data from the NOMAD catalogue. The nature of EROS2 J005135-714459(sm0060n13842) remains unclear. For this star, we may have detected a non-zero proper motion for this star, which would imply that it is a foreground object. Its radial velocity, pulsational characteristics, and photometric data, however, suggest that it is instead a Cepheid-like object located in the SMC. In such a case, it would present a challenge to conventional Cepheid models.

  13. SU-E-I-18: CT Scanner QA Using Normalized CTDI Ratio

    SciTech Connect (OSTI)

    Randazzo, M; Tambasco, M; Russell, B [San Diego State University, San Diego, CA (United States)

    2014-06-01T23:59:59.000Z

    Purpose: To create a ratio of weighted computed tomography dose index (CTDIw) data normalized to in-air measurements (CTDIair) as a function of beam quality to create a look-up table for frequent, rapid quality assurance (QA) checks of CTDI. Methods: The CTDIw values were measured according to TG-63 protocol using a pencil ionization chamber (Unfors Xi CT detector) and head and body Polymethyl methacrylate (PMMA) phantoms (16 and 32 cm diameter, respectively). Single scan dose profiles were measured at each clinically available energy (80,100,120,140 kVp) on three different CT scanners (two Siemens SOMATOM Definition Flash and one GE Optima), using a tube current of 400 mA, a one second rotation time, and the widest available beam width (32 0.6 mm and 16 1.25 mm, respectively). These values were normalized to CTDIair measurements using the same conditions as CTDIw. The ratios (expressed in cGy/R) were assessed for each scanner as a function of each energy's half value layer (HVL) paired with the phantom's appropriate bow tie filter measured in mmAl. Results: Normalized CTDI values vary linearly with HVL for both the head and body phantoms. The ratios for the two Siemens machines are very similar at each energy. Compared to the GE scanner, these values vary between 1020% for each kVp setting. Differences in CTDIair contribute most to the deviation of the ratios across machines. Ratios are independent of both mAs and collimation. Conclusion: Look-up tables constructed of normalized CTDI values as a function of HVL can be used to derive CTDIw data from only three in-air measurements (one for CTDIair and two with added filtration for HVL) to allow for simple, frequent QA checks without CT phantom setup. Future investigations will involve comparing results with Monte Carlo simulations for validation.

  14. Efficacy of Lower-Body Shielding in Computed Tomography Fluoroscopy-Guided Interventions

    SciTech Connect (OSTI)

    Mahnken, Andreas H., E-mail: mahnken@rad.rwth-aachen.de [RWTH Aachen, Department of Diagnostic and Interventional Radiology (Germany); Sedlmair, Martin [Siemens, Healthcare Sector (Germany); Ritter, Christine [University of Copenhagen, Niels Bohr Institute (Denmark); Banckwitz, Rosemarie; Flohr, Thomas [Siemens, Healthcare Sector (Germany)

    2012-12-15T23:59:59.000Z

    Purpose: Computed tomography (CT) fluoroscopy-guided interventions pose relevant radiation exposure to the interventionalist. The goal of this study was to analyze the efficacy of lower-body shielding as a simple structural method for decreasing radiation dose to the interventionalist without limiting access to the patient. Material and Methods: All examinations were performed with a 128-slice dual source CT scanner (12 Multiplication-Sign 1.2-mm collimation; 120 kV; and 20, 40, 60, and 80 mAs) and an Alderson-Rando phantom. Scatter radiation was measured with an ionization chamber and a digital dosimeter at standardized positions and heights with and without a lower-body lead shield (0.5-mm lead equivalent; Kenex, Harlow, UK). Dose decreases were computed for the different points of measurement. Results: On average, lower-body shielding decreased scatter radiation by 38.2% within a 150-cm radius around the shielding. This decrease is most significant close to the gantry opening and at low heights of 50 and 100 cm above the floor with a maximum decrease of scatter radiation of 95.9% close to the scanner's isocentre. With increasing distance to the gantry opening, the effect decreased. There is almost no dose decrease effect at {>=}150 above the floor. Scatter radiation and its decrease were linearly correlated with the tube current-time product (r{sup 2} = 0.99), whereas percent scatter radiation decrease was independent of the tube current-time product. Conclusion: Lower-body shielding is an effective way to decrease radiation exposure to the interventionalist and should routinely be used in CT fluoroscopy-guided interventions.

  15. Heterogeneous Recycling in Fast Reactors

    SciTech Connect (OSTI)

    Forget, Benoit; Pope, Michael; Piet, Steven J.; Driscoll, Michael

    2012-07-30T23:59:59.000Z

    Current sodium fast reactor (SFR) designs have avoided the use of depleted uranium blankets over concerns of creating weapons grade plutonium. While reducing proliferation risks, this restrains the reactor design space considerably. This project will analyze various blanket and transmutation target configurations that could broaden the design space while still addressing the non-proliferation issues. The blanket designs will be assessed based on the transmutation efficiency of key minor actinide (MA) isotopes and also on mitigation of associated proliferation risks. This study will also evaluate SFR core performance under different scenarios in which depleted uranium blankets are modified to include minor actinides with or without moderators (e.g. BeO, MgO, B4C, and hydrides). This will be done in an effort to increase the sustainability of the reactor and increase its power density while still offering a proliferation resistant design with the capability of burning MA waste produced from light water reactors (LWRs). Researchers will also analyze the use of recycled (as opposed to depleted) uranium in the blankets. The various designs will compare MA transmutation efficiency, plutonium breeding characteristics, proliferation risk, shutdown margins and reactivity coefficients with a current reference sodium fast reactor design employing homogeneous recycling. The team will also evaluate the out-of-core accumulation and/or burn-down rates of MAs and plutonium isotopes on a cycle-by-cycle basis. This cycle-by-cycle information will be produced in a format readily usable by the fuel cycle systems analysis code, VISION, for assessment of the sustainability of the deployment scenarios.

  16. VLBA DETERMINATION OF THE DISTANCE TO NEARBY STAR-FORMING REGIONS. IV. A PRELIMINARY DISTANCE TO THE PROTO-HERBIG AeBe STAR EC 95 IN THE SERPENS CORE

    SciTech Connect (OSTI)

    Dzib, Sergio; Loinard, Laurent; Rodriguez, Luis F. [Centro de RadioastronomIa y Astrofisica, Universidad Nacional Autonoma de Mexico Apartado Postal 3-72, 58090, Morelia, Michoacan (Mexico); Mioduszewski, Amy J. [National Radio Astronomy Observatory, Domenici Science Operations Center, 1003 Lopezville Road, Socorro, NM 87801 (United States); Boden, Andrew F. [Division of Physics, Math, and Astronomy, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125 (United States); Torres, Rosa M., E-mail: s.dzib@crya.unam.m [Argelander Institute for Astronomy, University of Bonn, Auf dem Huegel 71, 53121 Bonn (Germany)

    2010-08-01T23:59:59.000Z

    Using the Very Long Base Array, we observed the young stellar object EC 95 in the Serpens cloud core at eight epochs from 2007 December to 2009 December. Two sources are detected in our field and are shown to form a tight binary system. The primary (EC 95a) is a 4-5 M {sub sun} proto-Herbig AeBe object (arguably the youngest such object known), whereas the secondary (EC 95b) is most likely a low-mass T Tauri star. Interestingly, both sources are non-thermal emitters. While T Tauri stars are expected to power a corona because they are convective while they go down the Hayashi track, intermediate-mass stars approach the main sequence on radiative tracks. Thus, they are not expected to have strong superficial magnetic fields, and should not be magnetically active. We review several mechanisms that could produce the non-thermal emission of EC 95a and argue that the observed properties of EC 95a might be most readily interpreted if it possessed a corona powered by a rotation-driven convective layer. Using our observations, we show that the trigonometric parallax of EC 95 is {pi} = 2.41 {+-} 0.02 mas, corresponding to a distance of 414.9{sup +4.4} {sub -4.3} pc. We argue that this implies a distance to the Serpens core of 415 {+-} 5 pc and a mean distance to the Serpens cloud of 415 {+-} 25 pc. This value is significantly larger than previous estimates (d {approx} 260 pc) based on measurements of the extinction suffered by stars in the direction of Serpens. A possible explanation for this discrepancy is that these previous observations picked out foreground dust clouds associated with the Aquila Rift system rather than Serpens itself.

  17. Trivalent Lanthanide/Actinide Separation Using Aqueous-Modified TALSPEAK Chemistry

    SciTech Connect (OSTI)

    Travis S. Grimes; Richard D. Tillotson; Leigh R. Martin

    2014-05-01T23:59:59.000Z

    TALSPEAK is a liquid/liquid extraction process designed to separate trivalent lanthanides (Ln3+) from minor actinides (MAs) Am3+ and Cm3+. Traditional TALSPEAK organic phase is comprised of a monoacidic dialkyl bis(2-ethylhexyl)phosphoric acid extractant (HDEHP) in diisopropyl benzene (DIPB). The aqueous phase contains a soluble aminopolycarboxylate diethylenetriamine-N,N,N,N,N-pentaacetic acid (DTPA) in a concentrated (1.0-2.0 M) lactic acid (HL) buffer with the aqueous acidity typically adjusted to pH 3.0. TALSPEAK balances the selective complexation of the actinides by DTPA against the electrostatic attraction of the lanthanides by the HDEHP extractant to achieve the desired trivalent lanthanide/actinide group separation. Although TALSPEAK is considered a successful separations scheme, recent fundamental studies have highlighted complex chemical interactions occurring in the aqueous and organic phases during the extraction process. Previous attempts to model the system have shown thermodynamic models do not accurately predict the observed extraction trends in the p[H+] range 2.5-4.8. In this study, the aqueous phase is modified by replacing the lactic acid buffer with a variety of simple and longer-chain amino acid buffers. The results show successful trivalent lanthanide/actinide group separation with the aqueous-modified TALSPEAK process at pH 2. The amino acid buffer concentrations were reduced to 0.5 M (at pH 2) and separations were performed without any effect on phase transfer kinetics. Successful modeling of the aqueous-modified TALSPEAK process (p[H+] 1.6-3.1) using a simplified thermodynamic model and an internally consistent set of thermodynamic data is presented.

  18. First images of 6.7-GHz methanol masers in DR21(OH) and DR21(OH)N

    E-Print Network [OSTI]

    L. Harvey-Smith; R. Soria-Ruiz; A. Duarte-Cabral; R. J. Cohen

    2007-11-18T23:59:59.000Z

    The first images of 6.7-GHz methanol masers in the massive star-forming regions DR21(OH) and DR21(OH)N are presented. By measuring the shapes, radial velocities and polarization properties of these masers it is possible to map out the structure, kinematics and magnetic fields in the molecular gas that surrounds newly-formed massive stars. The intrinsic angular resolution of the observations was 43 mas (~100 AU at the distance of DR21), but structures far smaller than this were revealed by employing a non-standard mapping technique. This technique was used in an attempt to identify the physical structure (e.g. disc, outflow, shock) associated with the methanol masers. Two distinct star-forming centres were identified. In DR21(OH) the masers had a linear morphology, and the individual maser spots each displayed an internal velocity gradient in the same direction as the large-scale structure. They were detected at the same position as the OH 1.7-GHz ground-state masers, close to the centre of an outflow traced by CO and class I methanol masers. The shape and velocity gradients of the masers suggests that they probably delineate a shock. In DR21(OH)N the methanol masers trace an arc with a double-peaked profile and a complex velocity gradient. This velocity gradient closely resembles that of a Keplerian disc. The masers in the arc are 4.5% linearly polarized, with a polarization angle that indicates that the magnetic field direction is roughly perpendicular to the large-scale magnetic field in the region (indicated by lower angular resolution measurements of the CO and dust polarization). The suitability of channel-by-channel centroid mapping is discussed as an improved and viable means to maximise the information gained from the data.

  19. Imaging the oxygen-rich disk toward the silicate carbon star EU And

    E-Print Network [OSTI]

    Keiichi Ohnaka; David A. Boboltz

    2007-12-14T23:59:59.000Z

    We present multi-epoch high-angular resolution observations of 22 GHz H2O masers toward the silicate carbon star EU And to probe the spatio-kinematic distribution of oxygen-rich material. EU And was observed at three epochs (maximum time interval of 14 months) with the Very Long Baseline Array (VLBA). Our VLBA observations of the 22 GHz H2O masers have revealed that the maser spots are distributed along a straight line across ~20 mas, with a slight hint of an S-shaped structure. The observed spectra show three prominent velocity components at V_LSR = -42, -38, and -34 km s^-1, with the masers in SW redshifted and those in NE blueshifted. The maser spots located in the middle of the overall distribution correspond to the component at V_LSR = -38 km s^-1, which approximately coincides with the systemic velocity. These observations can be interpreted as either an emerging helical jet or a disk viewed almost edge-on (a circumbinary or circum-companion disk). However, the outward motion measured in the VLBA images taken 14 months apart is much smaller than that expected from the jet scenario. Furthermore, the mid-infrared spectrum obtained with the Spitzer Space Telescope indicates that the 10 micron silicate emission is optically thin and the silicate grains are of sub-micron size. This lends support to the presence of a circum-companion disk, because an optically thin circumbinary disk consisting of such small grains would be blown away by the intense radiation pressure of the primary (carbon-rich) star. If we assume Keplerian rotation for the circum-companion disk, the mass of the companion is estimated to be 0.5--0.8 M_sun. We also identify CO2 emission features at 13--16 micron in the Spitzer spectrum of EU And--the first unambiguous detection of CO2 in silicate carbon stars.

  20. Improved evidence for the existence of an intermediate phase during hydration of tricalcium silicate

    SciTech Connect (OSTI)

    Bellmann, Frank, E-mail: frank.bellmann@uni-weimar.d [Institute for Building Materials Science, Bauhaus University Weimar, 99423 Weimar (Germany); Damidot, Denis [Ecole des Mines de Douai, Civil and Environmental Engineering Department, 941 rue Charles Bourseul, BP 10838, 59508 Doua cedexi (France); Moeser, Bernd [Institute for Building Materials Science, Bauhaus University Weimar, 99423 Weimar (Germany); Skibsted, Jorgen [Instrument Center for Solid-State NMR Spectroscopy and Interdisciplinary Nanoscience Center (iNANO), Department of Chemistry, Aarhus University DK-8000 Aarhus C (Denmark)

    2010-06-15T23:59:59.000Z

    Tricalcium silicate (Ca{sub 3}SiO{sub 5}) with a very small particle size of approximately 50 nm has been prepared and hydrated for a very short time (5 min) by two different modes in a paste experiment, using a water/solid-ratio of 1.20, and by hydration as a suspension employing a water/solid-ratio of 4000. A phase containing uncondensed silicate monomers close to hydrogen atoms (either hydroxyl groups or water molecules) was formed in both experiments. This phase is distinct from anhydrous tricalcium silicate and from the calcium-silicate-hydrate (C-S-H) phase, commonly identified as the hydration product of tricalcium silicate. In the paste experiment, approximately 79% of silicon atoms were present in the hydrated phase containing silicate monomers as determined from {sup 29}Sileft brace{sup 1}Hright brace CP/MAS NMR. This result is used to show that the hydrated silicate monomers are part of a separate phase and that they cannot be attributed to a hydroxylated surface of tricalcium silicate after contact with water. The phase containing hydrated silicate monomers is metastable with respect to the C-S-H phase since it transforms into the latter in a half saturated calcium hydroxide solution. These data is used to emphasize that the hydration of tricalcium silicate proceeds in two consecutive steps. In the first reaction, an intermediate phase containing hydrated silicate monomers is formed which is subsequently transformed into C-S-H as the final hydration product in the second step. The introduction of an intermediate phase in calculations of the early hydration of tricalcium silicate can explain the presence of the induction period. It is shown that heterogeneous nucleation on appropriate crystal surfaces is able to reduce the length of the induction period and thus to accelerate the reaction of tricalcium silicate with water.

  1. Space-VLBI Polarimetry of the BL Lac Object S5 0716+714: Rapid Polarization Variability in the VLBI core

    E-Print Network [OSTI]

    U. Bach; T. P. Krichbaum; A. Kraus; A. Witzel; J. A. Zensus

    2006-03-31T23:59:59.000Z

    To determine the location of the intra-day variable (IDV) emission region within the jet of the BL Lac object S5 0716+714, a multi-epoch VSOP polarization experiment was performed in Autumn 2000. To detect, image, and monitor the short term variability of the source, three space-VLBI experiments were performed with VSOP at 5 GHz, separated in time by six days and by one day. Quasi-contemporaneous flux density measurements with the Effelsberg 100 m radio telescope during the VSOP observations revealed variability of about 5% in total intensity and up to 40% in linear polarization in less than one day. Analysis of the VLBI data shows that the variations are located inside the VLBI core component of 0716+714. In good agreement with the single-dish measurements, the VLBI ground array images and the VSOP images, both show a decrease in the total flux density of ~20 mJy and a drop of ~5 mJy in the linear polarization of the VLBI core. During the observing interval, the polarization angle rotated by about 15 degrees. No variability was found in the jet. The high angular-resolution VSOP images are not able to resolve the variable component and set an upper limit of <0.1 mas to the size of the core component. From the variability timescales we estimate a source size of a few micro-arcseconds and brightness temperatures exceeding 10^15 K. We discuss the results in the framework of source-extrinsic (interstellar scintillation induced) and source-intrinsic IDV models.

  2. A characterization and evaluation of coal liquefaction process streams. Quarterly technical progress report, July 1--September 30, 1995

    SciTech Connect (OSTI)

    Robbins, G.A.; Brandes, S.D.; Winschel, R.A.; Burke, F.P.

    1995-12-01T23:59:59.000Z

    The objectives of this project are to support the DOE direct coal liquefaction process development program and to improve the useful application of analytical chemistry to direct coal liquefaction process development. Independent analyses by well-established methods will be obtained of samples produced in direct coal liquefaction processes under evaluation by DOE. Additionally, analytical instruments and techniques which are currently underutilized for the purpose of examining coal-derived samples will be evaluated. The data obtained from this study will be used to help guide current process development and to develop an improved data base on coal and coal liquids properties. A sample bank will be established and maintained for use in this project and will be available for use by other researchers. The reactivity of the non-distillable resids toward hydrocracking at liquefaction conditions (i.e., resid reactivity) will be examined. From the literature and data experimentally obtained, a mathematical kinetic model of resid conversion will be constructed. It is anticipated that such a model will provide insights useful for improving process performance and thus the economics of direct coal liquefaction. Some of the contract activities for this quarter are: We completed many of the analyses on the 81 samples received from HTI bench-scale run CMSL-9, in which coal, coal/mixed plastics, and coal/high density polyethylene were fed; Liquid chromatographic separations of the 15 samples in the University of Delaware sample set were completed; and WRI completed CP/MAS {sup 13}C-NMR analyses on the Delaware sample set.

  3. Coal liquefaction process streams characterization and evaluation: An analytical characterization case study

    SciTech Connect (OSTI)

    Brandes, S.D.; Robbins, G.A.; Winschel, R.A.; Burke, F.P.

    1993-12-31T23:59:59.000Z

    Deactivation of the second-stage supported catalyst dominated most of the properties over the course of the run. Consequences of increased catalyst age were increases in aromaticity and phenolic -OH concentration and decreases in hydrogen donor content and paraffinic hydrogen content in most process streams, including product distillates. Donor solvent quality of the whole PFL increased through the early part of the run until Period 8 when it apparently stabilized. The properties of the net product oil and its distillate fractions, as determined by NIPER, show that the coal-derived material has some desirable qualities. The whole crude has a low sulfur content and boils below the maximum temperature allowed for the production of transportation fuels. The naphtha fraction (IBP-380{degrees}F) is highly naphthenic and has a low benzene content. The naphtha fraction appears to be amenable to mild hydrotreating to produce a good gasoline blendstock. The kerosene (380--510{degrees}F) fraction is much too cyclic for use as aviation fuel and it is recommended that this fraction be distributed into the two cuts on either end of it (diesel and gasoline feedstocks). The 510--680{degrees}F fraction met most specifications as a heating fuel and diesel fuel. It appears that this material, after moderate hydroprocessing, could make a good diesel blendstock. Both the FIMS and CP/MAS {sup 13}C-NMR methods, currently being used to analyze the suite of twelve samples from HRI Run CC-15, are expected to provide chemical/molecular information to augment and extend the information provided by the base analyses. Preliminary information is encouraging.

  4. Phase transition upon K{sup +} ion exchange into Na-low silica X: Combined NMR and synchrotron X-ray powder diffraction study

    SciTech Connect (OSTI)

    Lee, Y.; Parise, J.B. [State Univ. of New York, Stony Brook, NY (United States)] [State Univ. of New York, Stony Brook, NY (United States); Carr, S.W. [ANSTO, Menai (Australia)] [ANSTO, Menai (Australia)

    1998-09-01T23:59:59.000Z

    The mechanism by which K{sup +} ions exchange into zeolite Na-low silica X (LSX) (Na{sub 96}Al{sub 96}Si{sub 96}O{sub 384}{center_dot}nH{sub 2}O) has ben determined by studying structures of the Na-LSX and K-LSX end members in the Na-K LSX solid solution series as well as samples exchanged at the 20%, 42% and 80% K{sup +} levels. A preliminary investigation using {sup 29}Si MAS NMR spectroscopy revealed a two-phase region in the solid solution near 80% K{sup +} exchange. Rietveld analysis of the powder diffraction data collected from hydrated samples showed that, up to 42% of K{sup +} exchange, K{sup +} ions were located preferentially at site I{prime}, just outside the double 6-ring (D6R) in the sodalite age, and at site II, above the single 6-ring (S6R) in the supercage. Introduction of K{sup +} ions into site I{prime} repositioned Na{sup +} ions into site I, at the center of the D6R. An abrupt change in the cubic lattice parameter from 25.0389(5) to 25.2086(5) {angstrom} marked the formation of a second phase at the 80% K{sup +}-exchange level as K{sup +} ions began to occupy site I. No coexistence of phases was observed for the fully K{sup +}-exchanged sample (a = 25.2486(2) {angstrom}), where sites I and II were fully occupied by K{sup +} ions.

  5. Nickel alloy stud bolts failure: A case history

    SciTech Connect (OSTI)

    Toffolo, G.; Fassina, P.; Marangoni, M. [AGIP SpA, Milan (Italy); Msallem, A. [AGIP Oil, Tripoli (Libyan Arab Jamahiriya)

    1996-12-01T23:59:59.000Z

    High strength and corrosion resistance material as Inconel X-750 has been selected for the seal flange bolts in an off-shore field in Libya, due to its properties at high temperature, needed for compliance with Fire Safe requirements. After 4 years from the production start-up, during a routine maintenance of wellheads, some bolts have been found cracked. The paper deals with all the activities done in order to understand the cause of the failure. In particular failure analysis has been carried out through laboratory investigation, and shop tests have been conducted to confirm the field procedure and determine the tension on the bolts during the installation. The main conclusion was that the bolts failed due to the concurrence of stress (over-torque that means stress level higher than yield one) and corrosion (pit/crevice conditions). This environmentally assisted failure is known as Hydrogen Embrittlement (HE). Test carried out using the same X-mas tree mounted on the platform justifies the assumption that in the field, where the conditions are far from the ideal, it is possible that even when a uniform torque is set, the tensile stress applied to the bolts is not uniform, making the situation critical. From the corrosion side, the failed bolts showed some corrosion points near the cracks, as due to environment in the crevice/pitting conditions required to justify the hydrogen presence (the bolts are not cathodically protected). Fatigue has been demonstrated not to be responsible for the failure. Solutions are recommended which can safely be adopted during the installation and the substitution of bolts on an existing wellhead, which is operative under pressure without shutting in the well, and not impairing the safety operating envelope.

  6. Charge Compensation in RE3+ (RE = Eu, Gd) and M+ (M = Li, Na, K) Co-Doped Alkaline Earth Nanofluorides Obtained by Microwave Reaction with Reactive Ionic Liquids Leading to Improved Optical Properties

    SciTech Connect (OSTI)

    Lorbeer, C [Ruhr-Universitat Bochum; Behrends, F [Westfalische Wilhelsm-Universitat Munster; Cybinska, J [Ruhr Universitat Bochum; Eckert, H [Westfalische Wilhelsm-Universitat Munster; Mudring, Anja -V [Ames Laboratory

    2014-01-01T23:59:59.000Z

    Alkaline earth fluorides are extraordinarily promising host matrices for phosphor materials with regard to rare earth doping. In particular, quantum cutting materials, which might considerably enhance the efficiency of mercury-free fluorescent lamps or SC solar cells, are often based on rare earth containing crystalline fluorides such as NaGdF4, GdF3 or LaF3. Substituting most of the precious rare earth ions and simultaneously retaining the efficiency of the phosphor is a major goal. Alkaline earth fluoride nanoparticles doped with trivalent lanthanide ions (which are required for the quantum cutting phenomenon) were prepared via a microwave assisted method in ionic liquids. As doping trivalent ions into a host with divalent cations requires charge compensation, this effect was thoroughly studied by powder X-ray and electron diffraction, luminescence spectroscopy and 23Na, 139La and 19F solid state NMR spectroscopy. Monovalent alkali ions were codoped with the trivalent lanthanide ions to relieve stress and achieve a better crystallinity and higher quantum cutting abilities of the prepared material. 19F-magic angle spinning (MAS)-NMR-spectra, assisted by 19F{23Na} rotational echo double resonance (REDOR) studies, reveal distinct local fluoride environments, the populations of which are discussed in relation to spatial distribution and clustering models. In the co-doped samples, fluoride species having both Na+ and La3+ ions within their coordination sphere can be identified and quantified. This interplay of mono- and trivalent ions in the CaF2 lattice appears to be an efficient charge compensation mechanism that allows for improved performance characteristics of such co-doped phosphor materials.

  7. Cupric Siliconiobate. Synthesis and Solid-State Studies of a Pseudosandwich-Type Heteropolyanion

    SciTech Connect (OSTI)

    Anderson, Travis M.; Alam, Todd M.; Rodriguez, Mark A.; Bixler, Joel N.; Xu, Wenqian; Parise, John B.; Nyman, May (SBU)

    2008-10-02T23:59:59.000Z

    The Na{sup +} and [Cu(en){sub 2}(H{sub 2}O){sub 2}]{sup 2+} (en = ethylenediamine) salt of a pseudosandwich-type heteropolyniobate forms upon prolonged heating of Cu(NO{sub 3}){sub 2} and hydrated Na{sub 14}[(SiOH){sub 2}Si{sub 2}Nb{sub 16}O{sub 54}] in a mixed water-en solution. The structure [a = 14.992(2) {angstrom}, b = 25.426(4) {angstrom}, c = 30.046(4) {angstrom}, orthorhombic, Pnn2, R1 = 6.04%, based on 25869 unique reflections] consists of two [Na(SiOH){sub 2}Si{sub 2}Nb{sub 16}O{sub 54}]{sup 13-} units linked by six sodium cations, and this sandwich is charge-balanced by five [Cu(en){sub 2}(H{sub 2}O){sub 2}]{sup 2+} complexes, seven protons, and three additional sodium atoms (all per a sandwich-type cluster). Diffuse-reflectance UV-vis indicates that there is a {lambda}{sub max} at 383 nm for the Cu{sup II} d-d transition and the {sup 29}Si MAS NMR spectrum has two peaks at -78.2 ppm (151 Hz) and -75.5 ppm (257 Hz) for the two pairs of symmetry-equivalent internal [SiO{sub 4}]{sup 4-} and external [SiO{sub 3}(OH)]{sup 3-} tetrahedra, respectively. Unlike tungsten-based sandwich-type complexes, the [Na(SiOH){sub 2}Si{sub 2}Nb{sub 16}O{sub 54}]{sup 13-} units are linked exclusively by Na{sup +} instead of one or more d-electron metals.

  8. Class B0631+519: Last of the Class Lenses

    SciTech Connect (OSTI)

    York, Tom; Jackson, N.; Browne, I.W.A.; Koopmans, L.V.E.; McKean, J.P.; Norbury, M.A.; Biggs, A.D.; Blandford, R.D.; de Bruyn, A.G.; Fassnacht, C.D.; Myers, S.T.; Pearson, T.J.; Phillips, P.M.; Readhead, A.C.S.; Rusin, D.; Wilkinson, P.N.; /Jodrell Bank /Kapteyn Astron. Inst., Groningen /UC, Davis /JIVE, Dwingeloo /KIPAC, Menlo Park /NFRA,

    2005-05-31T23:59:59.000Z

    We report the discovery of the new gravitational lens system CLASS B0631+519. Imaging with the VLA, MERLIN and the VLBA reveals a doubly-imaged flat-spectrum radio core, a doubly-imaged steep-spectrum radio lobe and possible quadruply-imaged emission from a second lobe. The maximum separation between the lensed images is 1.16 arcsec. High resolution mapping with the VLBA at 5 GHz resolves the most magnified image of the radio core into a number of sub-components spread across approximately 20 mas. No emission from the lensing galaxy or an odd image is detected down to 0.31 mJy (5{sigma}) at 8.4 GHz. Optical and near-infrared imaging with the ACS and NICMOS cameras on the HST show that there are two galaxies along the line of sight to the lensed source, as previously discovered by optical spectroscopy. We find that the foreground galaxy at z=0.0896 is a small irregular, and that the other, at z=0.6196 is a massive elliptical which appears to contribute the majority of the lensing effect. The host galaxy of the lensed source is detected in the HST near-infrared imaging as a set of arcs, which form a nearly complete Einstein ring. Mass modeling using non-parametric techniques can reproduce the near-infrared observations and indicates that the small irregular galaxy has a (localized) effect on the flux density distribution in the Einstein ring at the 5-10% level.

  9. DISCOVERY, PROGENITOR AND EARLY EVOLUTION OF A STRIPPED ENVELOPE SUPERNOVA iPTF13bvn

    SciTech Connect (OSTI)

    Cao, Yi; Horesh, Assaf; Kulkarni, S. R. [Astronomy Department, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125 (United States)] [Astronomy Department, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125 (United States); Kasliwal, Mansi M. [The Observatories, Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)] [The Observatories, Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Arcavi, Iair; Gal-Yam, Avishay; Gorbikov, Evgeny; Ofek, Eran O.; Yaron, Ofer [Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100 (Israel)] [Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100 (Israel); Hancock, Paul [Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006 (Australia)] [Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006 (Australia); Valenti, Stefano; Graham, Melissa; Howell, D. Andrew [Las Cumbres Observatory Global Telescope Network, Goleta, CA 93117 (United States)] [Las Cumbres Observatory Global Telescope Network, Goleta, CA 93117 (United States); Cenko, S. Bradley [Astrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771 (United States)] [Astrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771 (United States); Sand, David [Department of Physics, Texas Tech University, Lubbock, TX 79409 (United States)] [Department of Physics, Texas Tech University, Lubbock, TX 79409 (United States); Silverman, Jeffrey M.; Wheeler, J. Craig; Marion, G. H. [Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)] [Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States); Walker, Emma S. [Department of Physics, Yale University, New Haven, CT 06511-8499 (United States)] [Department of Physics, Yale University, New Haven, CT 06511-8499 (United States); Mazzali, Paolo, E-mail: ycao@astro.caltech.edu [INAF-Padova Astronomical Observatory, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy)] [INAF-Padova Astronomical Observatory, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy); and others

    2013-09-20T23:59:59.000Z

    The intermediate Palomar Transient Factory reports our discovery of a young supernova, iPTF13bvn, in the nearby galaxy, NGC 5806 (22.5 Mpc). Our spectral sequence in the optical and infrared suggests a Type Ib classification. We identify a blue progenitor candidate in deep pre-explosion imaging within a 2? error circle of 80 mas (8.7 pc). The candidate has an M{sub B} luminosity of 5.52 0.39 mag and a B I color of 0.25 0.25 mag. If confirmed by future observations, this would be the first direct detection for a progenitor of a Type Ib. Fitting a power law to the early light curve, we find an extrapolated explosion date around 0.6 days before our first detection. We see no evidence of shock cooling. The pre-explosion detection limits constrain the radius of the progenitor to be smaller than a few solar radii. iPTF13bvn is also detected in centimeter and millimeter wavelengths. Fitting a synchrotron self-absorption model to our radio data, we find a mass-loading parameter of 1.310{sup 12} g cm{sup 1}. Assuming a wind velocity of 10{sup 3} km s{sup 1}, we derive a progenitor mass-loss rate of 3 10{sup 5} M {sub ?} yr{sup 1}. Our observations, taken as a whole, are consistent with a Wolf-Rayet progenitor of the supernova iPTF13bvn.

  10. Proton Dynamics in ZnO Nanorods Quantified by In Situ Solid-State 1H Nuclear Magnetic Resonance

    SciTech Connect (OSTI)

    Wang, Li Q.; Zhou, Xiao Dong; Exarhos, Gregory J.; Pederson, Larry R.; Wang, Chong M.; Windisch, Charles F.; Yao, Chunhua

    2007-10-22T23:59:59.000Z

    Zinc oxide (ZnO) adopts wurtzite structure and possesses a direct wide band gap (Eg ~ 3.3 eV at 300 K), similar to that of GaN (Eg ~ 3.4 eV at 300 K), which enables ZnO as an alternative candidate to replace GaN for use in optoelectronic devices. The present controversy is centered at the microscopic origin of the native donors, particularly after ab initio calculations by Van de Walle, which indicate that hydrogen is soluble in ZnO at the interstitial sites, effectively forming a donor level just below the conduction band in ZnO. Hence, the origin of n type conductivity in ZnO is proposed due to the presence of hydrogen. Electron paramagnetic resonance and spectroscopic observations of muons provide experimental evidence of hydrogen presence in ZnO. Whereas, Look et al. suggests that the complex of zinc interstitial and nitrogen defect is a stronger candidate for donor than hydrogen interstitials under N ambient. Hydrogen-oxygen complex is claimed to be stable even at T > 1000C in the hydrothermally synthesized ZnO. Therefore, the thermodynamic nature of hydrogen characteristics remains controversial, particularly its role on resident defects. In this letter, in situ temperature dependent solid state 1H magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy is employed to probe the local chemical environments of hydrogen in ZnO nanorods. To best knowledge of ours, this is the first time that the presence of hydrogen, its concentration, and local transport dynamics are directly chemically determined. Moreover, in situ NMR allows a new approach to investigate the absorption and desorption of protons from different sites on the ZnO nanorods, thus study of site-specific proton dynamics in ZnO becomes feasible.

  11. Surfactant-assisted synthesis of hybrid lithium iron phosphate nanoparticles for enhancing electrochemical performance

    SciTech Connect (OSTI)

    Min Kim, Jung [Division of Materials Science, Korea Basic Science Institute (KBSI), Daejeon 305-806 (Korea, Republic of); Yi, Gi-Ra [Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of); Chang Lee, Soon; Moon Lee, Sang; Jo, Younghun [Division of Materials Science, Korea Basic Science Institute (KBSI), Daejeon 305-806 (Korea, Republic of); Kang, Hyun-Wook [Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon 305-764 (Korea, Republic of); Lee, Gaehang, E-mail: ghlee@kbsi.re.kr [Division of Materials Science, Korea Basic Science Institute (KBSI), Daejeon 305-806 (Korea, Republic of); Jin Kim, Hae, E-mail: hansol@kbsi.re.kr [Division of Materials Science, Korea Basic Science Institute (KBSI), Daejeon 305-806 (Korea, Republic of); Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon 305-764 (Korea, Republic of)

    2013-01-15T23:59:59.000Z

    Hybrid nanoparticles of LiFePO{sub 4} with carbon and lithium phosphates were synthesized through organic-inorganic co-assembly procedure using a triblock copolymer (F108 or P123). We found that the triblock copolymers play a critical role in controlling size of hybrid particle and the degree of crystallinity of the inorganic nanostructures. The hybrid using P-123 had more graphitic carbon which resulted in fast electron mobility. Also, magic angle spinning nuclear magnetic resonance (MAS-NMR) revealed that the crystallinity of the hybrid using P123 is higher than that using F108 which is not measurable in X-ray diffraction. Electrochemical performance of the hybrid using P123 as a cathode material in Li-ion batteries showed superior rate capability at 20 C of charging rate and 2 C of discharging rate without capacity loss, in which discharge capacity was 102 mAh/g. - Graphical abstract: Hybrid nanoparticles were synthesized through organic-inorganic co-assembly based on synthetic procedure of mesoporous materials. P123-LFP showed superior high-rate capability at a 20 C charging rate and 2 C discharging rate without capacity loss in Li-ion battery. Highlights: Black-Right-Pointing-Pointer LiFePO{sub 4} nanohybrids are synthesized through the organic-inorganic co-assembly method. Black-Right-Pointing-Pointer Copolymers (F108 or P123) serve as structure directing agents and a carbon source. Black-Right-Pointing-Pointer P123 produces more graphitic carbon and higher crystalline nanohybrids. Black-Right-Pointing-Pointer Nanohybrids using P123 show superior rate capability in Li-ion battery.

  12. ON THE INTERPRETATION OF RECENT PROPER MOTION DATA FOR THE LARGE MAGELLANIC CLOUD

    SciTech Connect (OSTI)

    Bekki, Kenji [ICRAR, M468, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009 (Australia)

    2011-03-20T23:59:59.000Z

    Recent observational studies using the Hubble Space Telescope have derived the center-of-mass proper motion (CMPM) of the Large Magellanic Cloud (LMC). Although these studies carefully treated both rotation and perspective effects in deriving the proper motion (PM) for each of the sampled fields, they did not consider the effects of local random motion in the derivation. This means that the average PM of the fields (i.e., the observed CMPM) could significantly deviate from the true CMPM, because the effect of local random motion cannot be close to zero in making the average PM for the small number of fields ({approx}10). We discuss how significantly the observationally derived CMPM can deviate from the true CMPM by applying the same method as used in the observations for a dynamical model of the LMC with a known true CMPM. We find that the deviation can be as large as {approx}50 km s{sup -1} ({approx}0.21 mas yr{sup -1}), if the LMC has a thick disk and a maximum circular velocity of {approx}120 km s{sup -1}. We also find that the deviation depends both on the total number of sampled fields and on the structure and kinematics of the LMC. We therefore suggest that there is a possibility that the observed CMPM of the LMC deviates from the true one to some extent. We also show that a simple mean of PM for a large number of LMC fields ({approx}1000) can be much closer to the true CMPM.

  13. ERRATIC JET WOBBLING IN THE BL LACERTAE OBJECT OJ287 REVEALED BY SIXTEEN YEARS OF 7 mm VLBA OBSERVATIONS

    SciTech Connect (OSTI)

    Agudo, Ivan; Gomez, Jose L. [Instituto de Astrofisica de Andalucia, CSIC, Apartado 3004, 18080 Granada (Spain); Marscher, Alan P.; Jorstad, Svetlana G. [Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States); Perucho, Manel [Departament d'Astronomia i Astrofisica, Universitat de Valencia, Dr. Moliner 50, E-46100 Burjassot, Valencia (Spain); Piner, B. Glenn [Department of Physics and Astronomy, Whittier College, 13406 East Philadelphia Street, Whittier, CA 90608 (United States); Rioja, Maria [Observatorio Astronomico Nacional, Apdo. 112, E-28803 Alcala de Henares, Madrid (Spain); Dodson, Richard, E-mail: iagudo@iaa.es [ICRAR/University of Western Australia, 35 Stirling Highway, Crawley, WA 6009 (Australia)

    2012-03-01T23:59:59.000Z

    We present the results from an ultra-high-resolution 7 mm Very Long Baseline Array study of the relativistic jet in the BL Lacertae object OJ287 from 1995 to 2011 containing 136 total intensity images. Analysis of the image sequence reveals a sharp jet-position-angle swing by >100 Degree-Sign during [2004,2006], as viewed in the plane of the sky, which we interpret as the crossing of the jet from one side of the line of sight to the other during a softer- and longer-term swing of the inner jet. Modulating such long-term swing, our images also show for the first time a prominent erratic wobbling behavior of the innermost {approx}0.4 mas of the jet with fluctuations in position angle of up to {approx}40 Degree-Sign over timescales {approx}2 yr. This is accompanied by highly superluminal motions along non-radial trajectories, which reflect the remarkable non-ballistic nature of the jet plasma on these scales. The erratic nature and short timescales of the observed behavior rule out scenarios such as binary black hole systems, accretion disk precession, and interaction with the ambient medium as possible origins of the phenomenon on the scales probed by our observations, although such processes may cause longer-term modulation of the jet direction. We propose that variable asymmetric injection of the jet flow, perhaps related to turbulence in the accretion disk, coupled with hydrodynamic instabilities leads to the non-ballistic dynamics that causes the observed non-periodic changes in the direction of the inner jet.

  14. ISO-SWS calibration and the accurate modelling of cool-star atmospheres: I. Method

    E-Print Network [OSTI]

    L. Decin; C. Waelkens; K. Eriksson; B. Gustafsson; B. Plez; A. J. Sauval; W. Van Assche; B. Vandenbussche

    2000-08-21T23:59:59.000Z

    A detailed spectroscopic study of the ISO-SWS data of the red giant Alpha Tau is presented, which enables not only the accurate determination of the stellar parameters of Alpha Tau, but also serves as a critical review of the ISO-SWS calibration. This study is situated in a broader context of an iterative process in which both accurate observations of stellar templates and cool star atmosphere models are involved to improve the ISO-SWS calibration process as well as the theoretical modelling of stellar atmospheres. Therefore a sample of cool stars, covering the whole A0 -- M8 spectral classification, has been observed in order to disentangle calibration problems and problems in generating the theoretical models and corresponding synthetic spectrum. By using stellar parameters found in the literature large discrepancies were seen between the ISO-SWS data and the generated synthetic spectrum of Alpha Tau. A study of the influence of various stellar parameters on the theoretical models and synthetic spectra, in conjunction with the Kolmogorov-Smirnov test to evaluate objectively the goodness-of-fit, enables us to pin down the stellar parameters with a high accuracy: Teff = 3850 +/- 70 K, log g = 1.50 +/- 0.15, M = 2.3 +/- 0.8 Msun, z = -0.15 +/- 0.20 dex, microturbulence = 1.7 +/- 0.3 km/s, 12C/13C= 10 +/- 1, abundance of C = 8.35 +/- 0.20 dex, abundance of N= 8.35 +/- 0.25 dex, abundance of O = 8.83 +/- 0.15 dex and the angular diameter is 20.77 +/- 0.83 mas. These atmospheric parameters were then compared with the results provided by other authors using other methods and/or spectra.

  15. SU-E-I-92: Is Photon Starvation Preventing Metal Artifact Reduction Algorithm From Working in KVCT?

    SciTech Connect (OSTI)

    Paudel, M [University of Alberta, Cross Cancer Institute, Edmonton, AB (Canada); currently at University of Toronto, Sunnybrook Health Sciences Center, Toronto, ON (Canada); MacKenzie, M; Fallone, B; Rathee, S [University of Alberta, Cross Cancer Institute, Edmonton, AB (Canada)

    2014-06-01T23:59:59.000Z

    Purpose: High density/high atomic number metallic objects create shading and streaking metal artifacts in the CT image that can cause inaccurate delineation of anatomical structures or inaccurate radiation dose calculation. A modified iterative maximum-likelihood polychromatic algorithm for CT (mIMPACT) that models the energy response of detectors, photon interaction processes and beam polychromaticity has successfully reduced metal artifacts in MVCT. Our extension of mIMPACT in kVCT did not significantly reduce metal artifacts for high density metal like steel. We hypothesize that photon starvation may result in the measured data in a commercial kVCT imaging beam. Methods: We measured attenuation of a range of steel plate thicknesses, sandwiched between two 12cm thick solid water blocks, using a Phillips Big Bore CTTM scanner in scout acquisition mode with 120kVp and 200mAs. The transmitted signal (y) was normalized to the air scan signal (y{sub 0}) to get attenuation [i.e., ln(y/y{sub 0})] data for a detector. Results: Below steel plate thickness of 13.4mm, the variations in measured attenuation as a function of view number are characterized by a quantum noise and show increased attenuation with metal thickness. On or above this thickness the attenuation shows discrete levels in addition to the quantum noise. Some views have saturated attenuation value. The histograms of the measured attenuation for up to 36.7mm of steel show this trend. The detector signal is so small that the quantization levels in the analog to digital (A-to-D) converter are visible, a clear indication of photon starvation. Conclusion: Photons reaching the kVCT detector after passing through a thick metal plate are either so low in number that the signal measured has large quantum noise, or are completely absorbed inside the plate creating photon starvation. This is un-interpretable by the mIMPACT algorithm and cannot reduce metal artifacts in kVCT for certain realistic thicknesses of steel hip implants. Moti Raj Paudel is supported by the Vanier Canada Graduate Scholarship, the Endowed Graduate Scholarship in Oncology and the Dissertation Fellowship at the University of Alberta. The authors acknowledge the CIHR operating grant number MOP 53254.

  16. AN ALL-SKY CATALOG OF BRIGHT M DWARFS

    SciTech Connect (OSTI)

    Lepine, Sebastien [Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States); Gaidos, Eric [Department of Geology and Geophysics, University of Hawaii, 1680 East-West Road, Honolulu, HI 96822 (United States)

    2011-10-15T23:59:59.000Z

    We present an all-sky catalog of M dwarf stars with apparent infrared magnitude J < 10. The 8889 stars are selected from the ongoing SUPERBLINK survey of stars with proper motion {mu} > 40 mas yr{sup -1}, supplemented on the bright end with the Tycho-2 catalog. Completeness tests which account for kinematic (proper motion) bias suggest that our catalog represents {approx}75% of the estimated {approx}11, 900 M dwarfs with J < 10 expected to populate the entire sky. Our catalog is, however, significantly more complete for the northern sky ({approx}90%) than it is for the south ({approx}60%). Stars are identified as cool, red M dwarfs from a combination of optical and infrared color cuts, and are distinguished from background M giants and highly reddened stars using either existing parallax measurements or, if such measurements are lacking, using their location in an optical-to-infrared reduced proper motion diagram. These bright M dwarfs are all prime targets for exoplanet surveys using the Doppler radial velocity or transit methods; the combination of low-mass and bright apparent magnitude should make possible the detection of Earth-size planets on short-period orbits using currently available techniques. Parallax measurements, when available, and photometric distance estimates are provided for all stars, and these place most systems within 60 pc of the Sun. Spectral type estimated from V - J color shows that most of the stars range from K7 to M4, with only a few late M dwarfs, all within 20 pc. Proximity to the Sun also makes these stars good targets for high-resolution exoplanet imaging searches, especially if younger objects can be identified on the basis of X-ray or UV excess. For that purpose, we include X-ray flux from ROSAT and FUV/NUV ultraviolet magnitudes from GALEX for all stars for which a counterpart can be identified in those catalogs. Additional photometric data include optical magnitudes from Digitized Sky Survey plates and infrared magnitudes from the Two Micron All Sky Survey.

  17. Quantitative comparison of noise texture across CT scanners from different manufacturers

    SciTech Connect (OSTI)

    Solomon, Justin B.; Christianson, Olav; Samei, Ehsan [Carl E. Ravin Advanced Imaging Laboratories and Clinical Imaging Physics Group, Department of Radiology, Medical Physics Graduate Program, Duke University Medical Center, Durham, North Carolina 27705 (United States); Carl E. Ravin Advanced Imaging Laboratories and Clinical Imaging Physics Group, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705 (United States); Carl E. Ravin Advanced Imaging Laboratories and Clinical Imaging Physics Group, Medical Physics Graduate Program, Departments of Radiology, Physics, Biomedical Engineering, and Electrical and Computer Engineering, Duke University, Durham, North Carolina 27705 (United States)

    2012-10-15T23:59:59.000Z

    Purpose: To quantitatively compare noise texture across computed tomography (CT) scanners from different manufacturers using the noise power spectrum (NPS). Methods: The American College of Radiology CT accreditation phantom (Gammex 464, Gammex, Inc., Middleton, WI) was imaged on two scanners: Discovery CT 750HD (GE Healthcare, Waukesha, WI), and SOMATOM Definition Flash (Siemens Healthcare, Germany), using a consistent acquisition protocol (120 kVp, 0.625/0.6 mm slice thickness, 250 mAs, and 22 cm field of view). Images were reconstructed using filtered backprojection and a wide selection of reconstruction kernels. For each image set, the 2D NPS were estimated from the uniform section of the phantom. The 2D spectra were normalized by their integral value, radially averaged, and filtered by the human visual response function. A systematic kernel-by-kernel comparison across manufacturers was performed by computing the root mean square difference (RMSD) and the peak frequency difference (PFD) between the NPS from different kernels. GE and Siemens kernels were compared and kernel pairs that minimized the RMSD and |PFD| were identified. Results: The RMSD (|PFD|) values between the NPS of GE and Siemens kernels varied from 0.01 mm{sup 2} (0.002 mm{sup -1}) to 0.29 mm{sup 2} (0.74 mm{sup -1}). The GE kernels 'Soft,''Standard,''Chest,' and 'Lung' closely matched the Siemens kernels 'B35f,''B43f,''B41f,' and 'B80f' (RMSD < 0.05 mm{sup 2}, |PFD| < 0.02 mm{sup -1}, respectively). The GE 'Bone,''Bone+,' and 'Edge' kernels all matched most closely with Siemens 'B75f' kernel but with sizeable RMSD and |PFD| values up to 0.18 mm{sup 2} and 0.41 mm{sup -1}, respectively. These sizeable RMSD and |PFD| values corresponded to visually perceivable differences in the noise texture of the images. Conclusions: It is possible to use the NPS to quantitatively compare noise texture across CT systems. The degree to which similar texture across scanners could be achieved varies and is limited by the kernels available on each scanner.

  18. VERY-LOW-MASS STELLAR AND SUBSTELLAR COMPANIONS TO SOLAR-LIKE STARS FROM MARVELS. III. A SHORT-PERIOD BROWN DWARF CANDIDATE AROUND AN ACTIVE G0IV SUBGIANT

    SciTech Connect (OSTI)

    Ma Bo; Ge Jian; De Lee, Nathan; Fleming, Scott W.; Lee, Brian L.; Wang Ji [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055 (United States); Barnes, Rory; Agol, Eric [Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195-1580 (United States); Crepp, Justin R. [Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556 (United States); Dutra-Ferreira, Leticia; Porto de Mello, G. F. [Observatorio do Valongo, Universidade Federal do Rio de Janeiro, Ladeira do Pedro Antonio, 43, CEP: 20080-090, Rio de Janeiro, RJ (Brazil); Esposito, Massimiliano; Femenia, Bruno; Gonzalez Hernandez, Jonay I. [Instituto de Astrofisica de Canarias, C/Via Lctea S/N, E-38200 La Laguna (Spain); Gaudi, B. Scott [Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Ghezzi, Luan [Laboratorio Interinstitucional de e-Astronomia (LIneA), Rio de Janeiro, RJ 20921-400 (Brazil); Hebb, Leslie; Stassun, Keivan G. [Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States); Wisniewski, John P. [Homer L Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W Brooks St, Norman, OK 73019 (United States); Bizyaev, Dmitry, E-mail: boma@astro.ufl.edu [Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349-0059 (United States); and others

    2013-01-01T23:59:59.000Z

    We present an eccentric, short-period brown dwarf candidate orbiting the active, slightly evolved subgiant star TYC 2087-00255-1, which has effective temperature T{sub eff} = 5903 {+-} 42 K, surface gravity log (g) = 4.07 {+-} 0.16 (cgs), and metallicity [Fe/H] = -0.23 {+-} 0.07. This candidate was discovered using data from the first two years of the Multi-object APO Radial Velocity Exoplanets Large-area Survey, which is part of the third phase of Sloan Digital Sky Survey. From our 38 radial velocity measurements spread over a two-year time baseline, we derive a Keplerian orbital fit with semi-amplitude K = 3.571 {+-} 0.041 km s{sup -1}, period P = 9.0090 {+-} 0.0004 days, and eccentricity e = 0.226 {+-} 0.011. Adopting a mass of 1.16 {+-} 0.11 M{sub Sun} for the subgiant host star, we infer that the companion has a minimum mass of 40.0 {+-} 2.5 M{sub Jup}. Assuming an edge-on orbit, the semimajor axis is 0.090 {+-} 0.003 AU. The host star is photometrically variable at the {approx}1% level with a period of {approx}13.16 {+-} 0.01 days, indicating that the host star spin and companion orbit are not synchronized. Through adaptive optics imaging we also found a point source 643 {+-} 10 mas away from TYC 2087-00255-1, which would have a mass of 0.13 M{sub Sun} if it is physically associated with TYC 2087-00255-1 and has the same age. Future proper motion observation should be able to resolve if this tertiary object is physically associated with TYC 2087-00255-1 and make TYC 2087-00255-1 a triple body system. Core Ca II H and K line emission indicate that the host is chromospherically active, at a level that is consistent with the inferred spin period and measured v{sub rot}sin i, but unusual for a subgiant of this T{sub eff}. This activity could be explained by ongoing tidal spin-up of the host star by the companion.

  19. Prediction of human observer performance in a 2-alternative forced choice low-contrast detection task using channelized Hotelling observer: Impact of radiation dose and reconstruction algorithms

    SciTech Connect (OSTI)

    Yu Lifeng; Leng Shuai; Chen Lingyun; Kofler, James M.; McCollough, Cynthia H. [Department of Radiology, Mayo Clinic, Rochester, Minnesota 55905 (United States); Carter, Rickey E. [Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, Minnesota 55905 (United States)

    2013-04-15T23:59:59.000Z

    Purpose: Efficient optimization of CT protocols demands a quantitative approach to predicting human observer performance on specific tasks at various scan and reconstruction settings. The goal of this work was to investigate how well a channelized Hotelling observer (CHO) can predict human observer performance on 2-alternative forced choice (2AFC) lesion-detection tasks at various dose levels and two different reconstruction algorithms: a filtered-backprojection (FBP) and an iterative reconstruction (IR) method. Methods: A 35 Multiplication-Sign 26 cm{sup 2} torso-shaped phantom filled with water was used to simulate an average-sized patient. Three rods with different diameters (small: 3 mm; medium: 5 mm; large: 9 mm) were placed in the center region of the phantom to simulate small, medium, and large lesions. The contrast relative to background was -15 HU at 120 kV. The phantom was scanned 100 times using automatic exposure control each at 60, 120, 240, 360, and 480 quality reference mAs on a 128-slice scanner. After removing the three rods, the water phantom was again scanned 100 times to provide signal-absent background images at the exact same locations. By extracting regions of interest around the three rods and on the signal-absent images, the authors generated 21 2AFC studies. Each 2AFC study had 100 trials, with each trial consisting of a signal-present image and a signal-absent image side-by-side in randomized order. In total, 2100 trials were presented to both the model and human observers. Four medical physicists acted as human observers. For the model observer, the authors used a CHO with Gabor channels, which involves six channel passbands, five orientations, and two phases, leading to a total of 60 channels. The performance predicted by the CHO was compared with that obtained by four medical physicists at each 2AFC study. Results: The human and model observers were highly correlated at each dose level for each lesion size for both FBP and IR. The Pearson's product-moment correlation coefficients were 0.986 [95% confidence interval (CI): 0.958-0.996] for FBP and 0.985 (95% CI: 0.863-0.998) for IR. Bland-Altman plots showed excellent agreement for all dose levels and lesions sizes with a mean absolute difference of 1.0%{+-} 1.1% for FBP and 2.1%{+-} 3.3% for IR. Conclusions: Human observer performance on a 2AFC lesion detection task in CT with a uniform background can be accurately predicted by a CHO model observer at different radiation dose levels and for both FBP and IR methods.

  20. Cs{sub 4}P{sub 2}Se{sub 10}: A new compound discovered with the application of solid-state and high temperature NMR

    SciTech Connect (OSTI)

    Gave, Matthew A.; Canlas, Christian G. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Chung, In [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Department of Chemistry, Northwestern University, Evanston, IL 60208 (United States); Iyer, Ratnasabapathy G. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Kanatzidis, Mercouri G. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States); Department of Chemistry, Northwestern University, Evanston, IL 60208 (United States)], E-mail: m-kanatzidis@northwestern.edu; Weliky, David P. [Department of Chemistry, Michigan State University, East Lansing, MI 48824 (United States)], E-mail: weliky@chemistry.msu.edu

    2007-10-15T23:59:59.000Z

    The new compound Cs{sub 4}P{sub 2}Se{sub 10} was serendipitously produced in high purity during a high-temperature synthesis done in a nuclear magnetic resonance (NMR) spectrometer. {sup 31}P magic angle spinning (MAS) NMR of the products of the synthesis revealed that the dominant phosphorus-containing product had a chemical shift of -52.8 ppm that could not be assigned to any known compound. Deep reddish brown well-formed plate-like crystals were isolated from the NMR reaction ampoule and the structure was solved with X-ray diffraction. Cs{sub 4}P{sub 2}Se{sub 10} has the triclinic space group P-1 with a=7.3587(11) A, b=7.4546(11) A, c=10.1420(15) A, {alpha}=85.938(2){sup o}, {beta}=88.055(2){sup o}, and {gamma}=85.609(2){sup o} and contains the [P{sub 2}Se{sub 10}]{sup 4-} anion. To our knowledge, this is the first compound containing this anion that is composed of two tetrahedral (PSe{sub 4}) units connected by a diselenide linkage. It was also possible to form a glass by quenching the melt in ice water, and Cs{sub 4}P{sub 2}Se{sub 10} was recovered upon annealing. The static {sup 31}P NMR spectrum at 350 deg. C contained a single peak with a -35 ppm chemical shift and a {approx}7 ppm peak width. This study highlights the potential of solid-state and high-temperature NMR for aiding discovery of new compounds and for probing the species that exist at high temperature. - Graphical abstract: The new compound Cs{sub 4}P{sub 2}Se{sub 10} was discovered following a high-temperature in situ synthesis in the NMR spectrometer and the structure was determined by single-crystal X-ray diffraction. It contains the new [P{sub 2}Se{sub 10}]{sup 4-} anion.

  1. NbF{sub 5} and TaF{sub 5}: Assignment of {sup 19}F NMR resonances and chemical bond analysis from GIPAW calculations

    SciTech Connect (OSTI)

    Biswal, Mamata, E-mail: Mamata.Biswal-Susanta_Kumar_Nayak.Etu@univ-lemans.fr [LUNAM Universit, Universit du Maine, CNRS UMR 6283, Institut des Molcules et des Matriaux du Mans, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9 (France); Body, Monique, E-mail: monique.body@univ-lemans.fr [LUNAM Universit, Universit du Maine, CNRS UMR 6283, Institut des Molcules et des Matriaux du Mans, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9 (France); Legein, Christophe, E-mail: christophe.legein@univ-lemans.fr [LUNAM Universit, Universit du Maine, CNRS UMR 6283, Institut des Molcules et des Matriaux du Mans, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9 (France); Sadoc, Aymeric, E-mail: Aymeric.Sadoc@cnrs-imn.fr [Institut des Matriaux Jean Rouxel (IMN), Universit de Nantes, CNRS, 2 rue de la Houssinire, BP 32229, 44322 Nantes Cedex 3 (France); Boucher, Florent, E-mail: Florent.Boucher@cnrs-imn.fr [Institut des Matriaux Jean Rouxel (IMN), Universit de Nantes, CNRS, 2 rue de la Houssinire, BP 32229, 44322 Nantes Cedex 3 (France)

    2013-11-15T23:59:59.000Z

    The {sup 19}F isotropic chemical shifts (?{sub iso}) of two isomorphic compounds, NbF{sub 5} and TaF{sub 5}, which involve six nonequivalent fluorine sites, have been experimentally determined from the reconstruction of 1D {sup 19}F MAS NMR spectra. In parallel, the corresponding {sup 19}F chemical shielding tensors have been calculated using the GIPAW method for both experimental and DFT-optimized structures. Furthermore, the [M{sub 4}F{sub 20}] units of NbF{sub 5} and TaF{sub 5} being held together by van der Waals interactions, the relevance of Grimme corrections to the DFT optimization processes has been evaluated. However, the semi-empirical dispersion correction term introduced by such a method does not show any significant improvement. Nonetheless, a complete and convincing assignment of the {sup 19}F NMR lines of NbF{sub 5} and TaF{sub 5} is obtained, ensured by the linearity between experimental {sup 19}F ?{sub iso} values and calculated {sup 19}F isotropic chemical shielding ?{sub iso} values. The effects of the geometry optimizations have been carefully analyzed, confirming among other matters, the inaccuracy of the experimental structure of NbF{sub 5}. The relationships between the fluorine chemical shifts, the nature of the fluorine atoms (bridging or terminal), the position of the terminal ones (opposite or perpendicular to the bridging ones), the fluorine charges, the ionicity and the length of the MF bonds have been established. Additionally, for three of the {sup 19}F NMR lines of NbF{sub 5}, distorted multiplets, arising from {sup 1}J-coupling and residual dipolar coupling between the {sup 19}F and {sup 93}Nb nuclei, were simulated yielding to values of {sup 93}Nb{sup 19}F {sup 1}J-coupling for the corresponding fluorine sites. - Graphical abstract: The complete assignment of the {sup 19}F NMR lines of NbF{sub 5} and TaF{sub 5} allow establishing relationships between the {sup 19}F ?{sub iso} values, the nature of the fluorine atoms (bridging or terminal), the position of the terminal ones (opposite or perpendicular to the bridging ones), the fluorine charges, the ionicity and the length of the MF bonds. Display Omitted - Highlights: The {sup 19}F ?{sub iso} values of NbF{sub 5} and TaF{sub 5} have been determined. The {sup 19}F chemical shielding tensors have been calculated using the GIPAW method. A confident assignment of the {sup 19}F NMR lines of NbF{sub 5} and TaF{sub 5} is obtained. The relationships between the {sup 19}F?{sub iso} values and the MF bonds features are established.

  2. A SPECTROSCOPIC CATALOG OF THE BRIGHTEST (J < 9) M DWARFS IN THE NORTHERN SKY{sup ,}

    SciTech Connect (OSTI)

    Lepine, Sebastien; Wilde, Matthew; Rojas-Ayala, Barbara; Cruz, Kelle L. [Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States); Hilton, Eric J.; Mann, Andrew W. [Institute for Astrophysics, University of Hawaii, Honolulu, HI 96822 (United States); Gaidos, Eric, E-mail: lepine@amnh.org, E-mail: brojas-ayala@amnh.org, E-mail: mwilde@amnh.org, E-mail: mshara@amnh.org, E-mail: hilton@ifa.hawaii.edu, E-mail: amann@ifa.hawaii.edu, E-mail: gaidos@hawaii.edu, E-mail: kellecruz@gmail.com [Department of Geology and Geophysics, University of Hawaii, 1680 East-West Road, Honolulu, HI 96822 (United States)

    2013-04-15T23:59:59.000Z

    We present a spectroscopic catalog of the 1564 brightest (J < 9) M dwarf candidates in the northern sky, as selected from the SUPERBLINK proper motion catalog. Observations confirm 1408 of the candidates to be late-K and M dwarfs with spectral subtypes K7-M6. From the low ({mu} > 40 mas yr{sup -1}) proper motion limit and high level of completeness of the SUPERBLINK catalog in that magnitude range, we estimate that our spectroscopic census most likely includes >90% of all existing, northern-sky M dwarfs with apparent magnitude J < 9. Only 682 stars in our sample are listed in the Third Catalog of Nearby Stars (CNS3); most others are relative unknowns and have spectroscopic data presented here for the first time. Spectral subtypes are assigned based on spectral index measurements of CaH and TiO molecular bands; a comparison of spectra from the same stars obtained at different observatories, however, reveals that spectral band index measurements are dependent on spectral resolution, spectrophotometric calibration, and other instrumental factors. As a result, we find that a consistent classification scheme requires that spectral indices be calibrated and corrected for each observatory/instrument used. After systematic corrections and a recalibration of the subtype-index relationships for the CaH2, CaH3, TiO5, and TiO6 spectral indices, we find that we can consistently and reliably classify all our stars to a half-subtype precision. The use of corrected spectral indices further requires us to recalibrate the {zeta} parameter, a metallicity indicator based on the ratio of TiO and CaH optical bandheads. However, we find that our {zeta} values are not sensitive enough to diagnose metallicity variations in dwarfs of subtypes M2 and earlier ({+-}0.5 dex accuracy) and are only marginally useful at later M3-M5 subtypes ({+-}0.2 dex accuracy). Fits of our spectra to the Phoenix atmospheric model grid are used to estimate effective temperatures. These suggest the existence of a plateau in the M1-M3 subtype range, in agreement with model fits of infrared spectra but at odds with photometric determinations of T{sub eff}. Existing geometric parallax measurements are extracted from the literature for 624 stars, and are used to determine spectroscopic and photometric distances for all the other stars. Active dwarfs are identified from measurements of H{alpha} equivalent widths, and we find a strong correlation between H{alpha} emission in M dwarfs and detected X-ray emission from ROSAT and/or a large UV excess in the GALEX point source catalog. We combine proper motion data and photometric distances to evaluate the (U, V, W) distribution in velocity space, which is found to correlate tightly with the velocity distribution of G dwarfs in the solar neighborhood. However, active stars show a smaller dispersion in their space velocities, which is consistent with those stars being younger on average. Our catalog will be most useful to guide the selection of the best M dwarf targets for exoplanet searches, in particular those using high-precision radial velocity measurements.

  3. Irradiation Planning for Fully-Ceramic Micro-encsapsulated fuel in ATR at LWR-relevant conditions: year-end report on FY-2011

    SciTech Connect (OSTI)

    Abderrafi M. Ougouag; R. Sonat Sen; Michael A. Pope; Brian Boer

    2011-09-01T23:59:59.000Z

    This report presents the estimation of required ATR irradiation levels for the DB-FCM fuel design (fueled with Pu and MAs). The fuel and assembly designs are those considered in a companion report [R. S. Sen et al., FCR&D-2011- 00037 or INL/EXT-11-23269]. These results, pertaining to the DB-FCM fuel, are definitive in as much as the design of said fuel is definitive. In addition to the work performed, as required, for DB-FCM fuel, work has started in a preliminary fashion on single-cell UO2 and UN fuels. These latter activities go beyond the original charter of this project and although the corresponding work is incomplete, significant progress has been achieved. However, in this context, all that has been achieved is only preliminary because the corresponding fuel designs are neither finalized nor optimized. In particular, the UO2 case is unlikely to result in a viable fuel design if limited to enrichment at or under 20 weight % in U-235. The UN fuel allows reasonable length cycles and is likely to make an optimal design possible. Despite being limited to preliminary designs and offering only preliminary conclusions, the irradiation planning tasks for UO2 and UN fuels that are summarized in this report are useful to the overall goal of devising and deploying FCM-LWR fuel since the methods acquired and tested in this project and the overall procedure for planning will be available for planning tests for the finalized fuel design. Indeed, once the fuel design is finalized and the expected burnup level is determined, the methodology that has been assembled will allow the prompt finalization of the neutronic planning of the irradiation experiment and would provide guidance on the expected experimental performance of the fuel. Deviations from the expected behavior will then have to be analyzed and the outcome of the analysis may be corrections or modifications for the assessment models as well as, possibly, fuel design modifications, and perhaps even variation of experimental control for future experimental phases. Besides the prediction of irradiation times, preliminary work was carried out on other aspects of irradiation planning. In particular, a method for evaluating the interplay of depletion, material performance modeling and irradiation is identified by reference to a companion report. Another area that was addressed in a preliminary fashion is the identification and selection of a strategy for the physical and mechanical design of the irradiation experiments. The principal conclusion is that the similarity between the FCM fuel and the fuel compacts of the Next Generation Nuclear Plant prismatic design are strong enough to warrant using irradiation hardware designs and instrumentation adapted from the AGR irradiation tests. Modifications, if found necessary, will probably be few and small, except as pertains to the water environment and its implications on the use of SiC cladding or SiC matrix with no additional cladding.

  4. Structural analysis and characterization of layer perovskite oxynitrides made from Dion-Jacobson oxide precursors

    SciTech Connect (OSTI)

    Schottenfeld, Joshua A. [Department of Chemistry, Pennsylvania State University, University Park, PA 16802 (United States); Benesi, Alan J. [Department of Chemistry, Pennsylvania State University, University Park, PA 16802 (United States); Stephens, Peter W. [Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794 (United States); Chen, Gugang [Departments of Physics, Pennsylvania State University, University Park, PA 16802 (United States); Eklund, Peter C. [Departments of Physics, Pennsylvania State University, University Park, PA 16802 (United States); Mallouk, Thomas E. [Department of Chemistry, Pennsylvania State University, University Park, PA 16802 (United States)]. E-mail: tom@chem.psu.edu

    2005-07-15T23:59:59.000Z

    A three-layer oxynitride Ruddlesden-Popper phase Rb{sub 1+x}Ca{sub 2}Nb{sub 3}O{sub 10-x}N{sub x}.yH{sub 2}O (x=0.7-0.8, y=0.4-0.6) was synthesized by ammonialysis at 800{sup o}C from the Dion-Jacobson phase RbCa{sub 2}Nb{sub 3}O{sub 10} in the presence of Rb{sub 2}CO{sub 3}. Incorporation of nitrogen into the layer perovskite structure was confirmed by XPS, combustion analysis, and MAS NMR. The water content was determined by thermal gravimetric analysis and the rubidium content by ICP-MS. A similar layered perovskite interconversion occurred in the two-layer Dion-Jacobson oxide RbLaNb{sub 2}O{sub 7} to yield Rb{sub 1+x}LaNb{sub 2}O{sub 7-x}N{sub x}.yH{sub 2}O (x=0.7-0.8, y=0.5-1.0). Both compounds were air- and moisture-sensitive, with rapid loss of nitrogen by oxidation and hydrolysis reactions. The structure of the three-layer oxynitride Rb{sub 1.7}Ca{sub 2}Nb{sub 3}O{sub 9.3}N{sub 0.7}.0.5H{sub 2}O was solved in space group P4/mmm with a=3.887(3) and c=18.65(1)A, by Rietveld refinement of X-ray powder diffraction data. The two-layer oxynitride structure Rb{sub 1.8}LaNb{sub 2}O{sub 6.3}N{sub 0.7}.1.0H{sub 2}O was also determined in space group P4/mmm with a=3.934(2) and c=14.697(2)A. GSAS refinement of synchrotron X-ray powder diffraction data showed that the water molecules were intercalated between a double layer of Rb+ ions in both the two- and three-layer Ruddlesden-Popper structures. Optical band gaps were measured by diffuse reflectance UV-vis for both materials. An indirect band gap of 2.51eV and a direct band gap of 2.99eV were found for the three-layer compound, while an indirect band gap of 2.29eV and a direct band gap of 2.84eV were measured for the two-layer compound. Photocatalytic activity tests of the three-layer compound under 380nm pass filtered light with AgNO{sub 3} as a sacrificial electron acceptor gave a quantum yield of 0.025% for oxygen evolution.

  5. Crystal-chemistry of mullite-type aluminoborates Al{sub 18}B{sub 4}O{sub 33} and Al{sub 5}BO{sub 9}: A stoichiometry puzzle

    SciTech Connect (OSTI)

    Fisch, Martin, E-mail: fisch@krist.unibe.c [Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestrasse 3, CH-3012 Bern (Switzerland); Armbruster, Thomas [Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestrasse 3, CH-3012 Bern (Switzerland); Rentsch, Daniel [EMPA, Swiss Federal Laboratories for Materials Science and Research, Laboratory for Functional Polymers, Uberlandstrasse 129, CH-8600 Duebendorf (Switzerland); Libowitzky, Eugen [Institut fuer Mineralogie und Kristallographie, Universitaet Wien - Geozentrum, Althanstrasse 14, A-1090 Wien (Austria); Pettke, Thomas [Rock-Water Interaction Group, Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, CH-3012 Bern (Switzerland)

    2011-01-15T23:59:59.000Z

    Orthorhombic Al{sub 2}O{sub 3}-rich aluminoborate is an important ceramic material for which two slightly different compositions have been assumed: Al{sub 5}BO{sub 9} (5Al{sub 2}O{sub 3}:B{sub 2}O{sub 3}) and Al{sub 18}B{sub 4}O{sub 33} (9Al{sub 2}O{sub 3}:2B{sub 2}O{sub 3}). The formula Al{sub 18}B{sub 4}O{sub 33} (=Al{sub 4.91}B{sub 1.09}O{sub 9}) was derived from results of chemical analyses when crystal structure data were not yet available. Subsequent structural investigations indicated Al{sub 5}BO{sub 9} composition. Nevertheless, Al{sub 18}B{sub 4}O{sub 33} was still accepted as the correct stoichiometry assuming that additional B replaces 9% Al. Powder samples of both compositions and ones with excess boron were prepared by solid state reactions between {alpha}-Al{sub 2}O{sub 3} and B{sub 2}O{sub 3}/H{sub 3}BO{sub 3} at temperatures above 1100 {sup o}C and single-crystals were grown from flux at 1100 and 1550 {sup o}C. Products were investigated by single-crystal and powder XRD, {sup 11}B and {sup 27}Al solid-state MAS-NMR, Raman and FTIR spectroscopy as well as Laser-ablation ICP-MS. No indication of the predicted 9% B{yields}Al substitution was found. LA ICP-MS indicated 12.36(27) wt% B{sub 2}O{sub 3} corresponding to Al{sub 4.97}B{sub 1.03}O{sub 9}. Hence, the suggested Al{sub 18}B{sub 4}O{sub 33} stoichiometry can be excluded for all synthesized samples. A very low amount of Al vacancies at a five-fold coordinated site are likely, charge balanced by an additional nearby three-fold coordinated B site. All evidences indicate that the title compound should be reported as Al{sub 5-x}B{sub 1+x}O{sub 9} with x<0.038(6), which is close to Al{sub 5}BO{sub 9}. -- Graphical abstract: A chemical composition of Al{sub 18}B{sub 4}O{sub 33}=Al{sub 4.91}B{sub 1.09}O{sub 9}=9Al{sub 2}O{sub 3}:2B{sub 2}O{sub 3} has been assumed for mullite-type aluminoborate with Al{sub 5}BO{sub 9} structure. However, samples prepared by different routes showed compositions close to 5Al{sub 2}O{sub 3}:B{sub 2}O{sub 3}. Display Omitted