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1

MAS 03 Marine Bloom Trajectory Prediction for AUV Mission Planning MAS 03.1 Overview  

E-Print Network [OSTI]

MAS 03 Marine Bloom Trajectory Prediction for AUV Mission Planning MAS 03.1 Overview Observing. Traditional approaches using ship-based measurements for observing such dynamic and episodic phenomenon have ships on fixed schedules. More recently Autonomous Underwater Vehicles (AUVs) have shown to be more cost

California at Los Angeles, University of

2

Protein MAS NMR methodology and structural analysis of protein assemblies  

E-Print Network [OSTI]

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. ...

Bayro, Marvin J

2010-01-01T23:59:59.000Z

3

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

E-Print Network [OSTI]

Continued #12;MAS273 3 (i) Agriculturists in Sheffield were interested in the effectiveness of 3 insectiMAS273 SCHOOL OF MATHEMATICS AND STATISTICS Spring Semester 2012­2013 MAS273 Statistical Modelling

4

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

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

Magnesium 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...

5

MAS 10.1 Implementation of the Integrated Safety Management System...  

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

MAS 10.1 Implementation of the Integrated Safety Management System (ISMS) Process in Maintenance Activities, 2142000 MAS 10.1 Implementation of the Integrated Safety Management...

6

E-Print Network 3.0 - angle spinning mas Sample Search Results  

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

. Introduction Magic angle spinning (MAS) is an essential NMR technique for studying disordered samples... proteins as demonstrated in the so-called MAOSS (magic angle...

7

E-Print Network 3.0 - airborne multispectral mas Sample Search...  

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

MAS data," Journal of Geophysical Research... of multispectral images: (1) GOES weather satellite data 4 (five bands of space-time data of hurricane events... , Figs. 1...

8

Using MAS Technologies for Intelligent Organizations: A Report of Bottom-Up Results  

E-Print Network [OSTI]

Using MAS Technologies for Intelligent Organizations: A Report of Bottom-Up Results Armando Robles1 Organizations us- ing MAS Technology. We discuss our experience of implementing different types of server agents institutional prescription, and having that prescription control the information system that handles the day

Luck, Michael

9

E/Z MAS: An easy-to-use computerized materials control and accountability system  

SciTech Connect (OSTI)

Nuclear facilities that handle and process nuclear materials are required to track their nuclear holdings and to keep adequate records that manage and control the inventory of those holdings. The complexity of a system that does this job is directly proportional to the complexity of the facility`s operations. This paper describes an approach to computerized materials protection, control, and accountability (MPC and A) that was introduced by Los Alamos National Laboratory (LANL) in the fall of 1997. This new system, E/Z MAS, is the latest addition to the LANL suite of computerized MPC and A tools, which also includes the CoreMAS system. E/Z MAS was initially designed to address the needs of those facilities that have small to modest MPC and A needs but has been expanded to provide full functionality for any facility. The system name, E/Z MAS, reflects the system`s easy-to-use characteristics, which include ease of installation and ease of software maintenance. Both CoreMAS and E/Z MAS have been provided to facilities in the Former Soviet Union to assist them in implementing a computerized MPC and A system that meets their needs. In this paper the authors will address the functionality of CoreMAS and E/Z MAS, and an argument in favor of intranet-based material control and accountability will be advanced.

Anderson, L.K.; Boor, M.G.; Hurford, J.M.; Landry, R.P.; Martinez, B.J.; Solem, A.M.; Whiteson, R.; Zardecki, A.

1998-12-31T23:59:59.000Z

10

E-Print Network 3.0 - antecesores vivos mas Sample Search Results  

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

88 ESTAMOS COMENZANDO AANDAR,por M. SOLER -3 ENTREVISTA A FRANCISCO J.AYALA, por A. MOYA -5 Summary: burocrticas lo son, al menos para mi), y solucionar algunos proble- mas...

11

Increasing 13C CP-MAS NMR Resolution Using Single Crystals: Applicatio...  

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

the resolution in solid state NMR, we investigated the use of single crystals in CP-MAS. Model compounds used were octaethyl porphyrins (NiOEP, H 2 OEP, ZnOEP). Over 200%...

12

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...

13

CP-MAS13C Nuclear Magnetic Resonance Spectra for Identification of Functionality of Octadecylsilica Bonded Phases  

Science Journals Connector (OSTI)

......December 1989 research-article Articles CP-MAS13C Nuclear Magnetic Resonance Spectra...Technology, Toyohashi Cross-polarization (CP) and magic angle spinning (MAS) carbon-13...Chromatographic Science, Vol. 27, December 1989 CP-MAS13 C Nuclear Magnetic Resonance Spectra......

Kiyokatsu Jinno

1989-12-01T23:59:59.000Z

14

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

SciTech Connect (OSTI)

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.

ANDERSON, D.L.

2000-02-01T23:59:59.000Z

15

Managing water demand as a regulated open MAS. (Work in progress)  

E-Print Network [OSTI]

1 Managing water demand as a regulated open MAS. (Work in progress) Vicente Botti1 , Antonio Scientific Research Council, {vbotti,agarridot,agiret}@dsic.upv.es, pablo@iiia.csic.es I. WATER MANAGEMENT management models are based on equa- tional descriptions of aggregate supply and demand in a water basin [2

Garrido, Antonio

16

Managing water demand as a regulated open MAS. (Work in progress)  

E-Print Network [OSTI]

1 Managing water demand as a regulated open MAS. (Work in progress) Vicente Botti 1 , Antonio Scientific Research Council, {vbotti,agarridot,agiret}@dsic.upv.es, pablo@iiia.csic.es I. WATER MANAGEMENT management models are based on equa­ tional descriptions of aggregate supply and demand in a water basin [2

Garrido, Antonio

17

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

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

3 Seasonal Preparation 3/21/95 3 Seasonal Preparation 3/21/95 MAS 10.3 Seasonal Preparation 3/21/95 The objective of this surveillance is to verify that the contractor is implementing appropriate measures to protect equipment and systems from damage due to the effects of cold weather. The Facility Representative evaluates systems necessary for the protection of the public and workers to determine if they have been adequately prepared for cold weather. The Facility Representative also examines other preparations for cold weather to ensure that materials are properly stored, permanent and auxiliary heating systems are functional, and other appropriate preparations have been completed. During the surveillance, the Facility Representative ensures that applicable DOE requirements have been implemented.

18

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

E-Print Network [OSTI]

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

Sheridan, Jennifer

19

65 6 1980 871-88:J BORIS SKET and TnoMAS M. lLlFFE  

E-Print Network [OSTI]

65 6 1980 871-88:J BORIS SKET and TnoMAS M. lLlFFE Bermuda Biological Station, and Institut za. Introduction 871 872 872 872 873 873 873 873 875 875 877 877 878 880 880 880 The Bermuda Islands consist

Iliffe, Thomas M.

20

29Si Chemical Shift Anisotropies in Calcium Silicates from High-Field 29Si MAS NMR Spectroscopy  

Science Journals Connector (OSTI)

29Si chemical shift anisotropy (CSA) data have been determined from 29Si MAS NMR spectra recorded at 14.1 T for a number of synthetic calcium silicates and calcium silicate hydrates. ... Synthesis. ... In all syntheses, reagents of analytical purity grade were obtained from commercial sources and used without further purification. ...

Michael Ryan Hansen; Hans J. Jakobsen; Jrgen Skibsted

2003-03-06T23:59:59.000Z

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

A co-simulation method as an enabler for joint analysis and design of MAS-based electrical power protection and communication  

Science Journals Connector (OSTI)

Multi-agent system (MAS) protection is under investigation as a potential method for distributed control in modern electrical power systems. The coordination of the MAS is based on local measurements available to each agent's site as well as on the information ... Keywords: Multi-agent system, integrated simulation, power system communication, power system protection

Weilin Li; Min Luo; Lin Zhu; Antonello Monti; Ferdinanda Ponci

2013-07-01T23:59:59.000Z

22

The incommensurate-commensurate phase transition in akermanite, Ca2MgSi2O7, observed by in-situ 29Si MAS NMR spectroscopy  

Science Journals Connector (OSTI)

29Si MAS NMR spectra of synthetic akermanite, Ca2MgSi2O7, exhibit a splitting into three or more lines in the stability feld of the low-temperature incommensurate phase. With increasing temperatu...

L. H. Merwin; A. Sebald; F. Seifert

1989-11-01T23:59:59.000Z

23

Determination of the structural changes by Raman and {sup 13}C CP/MAS NMR spectroscopy on native corn starch with plasticizers  

SciTech Connect (OSTI)

The plasticizing - antiplasticizing effect of water and glycerol contents on native corn starch samples is investigated by FT-Raman and {sup 13}C CP/MAS NMR spectroscopy. The presence of both amorphous and crystalline structural phases was evidenced in pure native corn starch and also in the samples containing plasticizers. Among the crystalline starch structures, the A- and V- types were suggested by CP/MAS NMR spectra.

Cozar, O. [Academy of Romanian Scientists, Splaiul Independentei 54, 050094, Bucharest, Romania and National Institute of Research-Development for Machines and Installations Designed to Agriculture and Food Industry - INMA Bucure?ti - Cluj-Napoca Branch (Romania)] [Academy of Romanian Scientists, Splaiul Independentei 54, 050094, Bucharest, Romania and National Institute of Research-Development for Machines and Installations Designed to Agriculture and Food Industry - INMA Bucure?ti - Cluj-Napoca Branch (Romania); Filip, C.; Tripon, C. [National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath, 400293 Cluj-Napoca (Romania)] [National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath, 400293 Cluj-Napoca (Romania); Cioica, N.; Co?a, C.; Nagy, E. M. [National Institute of Research-Development for Machines and Installations Designed to Agriculture and Food Industry - INMA Bucure?ti - Cluj-Napoca Branch, RO-400458 Cluj-Napoca (Romania)] [National Institute of Research-Development for Machines and Installations Designed to Agriculture and Food Industry - INMA Bucure?ti - Cluj-Napoca Branch, RO-400458 Cluj-Napoca (Romania)

2013-11-13T23:59:59.000Z

24

Spin dynamics and spin counting in the 13C CP/MAS analysis of Argonne Premium coals  

Science Journals Connector (OSTI)

The carbonyl-labelled compound, [3.2.1]bicyclo-4-pyrrolidino-N-methyl-octan-8-one triflate (13CO-123), has been used as an intensity standard for quantitative 13C cross-polarization magic angle spinning (CP/MAS) nuclear magnetic resonance (n.m.r.) analysis (including spin counting) of Argonne Premium coals. The cross-polarization time constants, TCH, and the rotating-frame proton spin-lattice relaxation times, T1?H, have been determined for each major 13C peak of each coal via a combination of variable contact-time and variable spin-lock experiments. Two or three components of rotating-frame 1H relaxation decay and two or three components of TCH behaviour have been observed for each major 13C peak of each coal. These data have been used to determine the number of carbon atoms detected in each coal; these values are in the range 7787% of the amount of carbon known to be in each coal from elemental analysis data, except for Pocahontas No. 3, for which only 50% of the carbon was detected.

Antoni Jurkiewicz; Gary E. Maciel

1994-01-01T23:59:59.000Z

25

Characterization of the rat mas oncogene and its high-level expression in the hippocampus and cerebral cortex of rat brain  

Science Journals Connector (OSTI)

...DNA showed that a single 5- kilobase fragment hybridized to a nick-translated, 32P-labeled human mas probe (data not shown...Annu. Rev. Biochem. 56, 159-193. 33. Taylor, C. W. & Merritt, J. E. (1986) Trends Pharmacol. Sri. 7, 238-242...

D Young; K O'Neill; T Jessell; M Wigler

1988-01-01T23:59:59.000Z

26

doi:10.1016/S0016-7037(02)00026-7 The distribution of sodium ions in aluminosilicate glasses: A high-field Na-23 MAS and 3Q  

E-Print Network [OSTI]

of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA (Received May 22-SiO2 join) and its distribution using 23 Na magic-angle spinning (MAS) nuclear magnetic resonance) because of the reduced effect of second-order quadrupolar interaction, and 23 Na MAS NMR spectra thus

Puglisi, Joseph

27

A BLOCH DECAY AND ULTRA HIGH SPEED CP/MAS 13C NMR STUDY OF THE ARGONNE PREMIUM COALS AND SELECTED OXIDISED LOW-RANK COALS  

Science Journals Connector (OSTI)

Publisher Summary This chapter presents the results of a Bloch decay and ultrahigh speed cross-polarization/magic angle spinning (CP/MAS) 13C nuclear magnetic resonance (NMR) study of the Argonne premium coals and selected oxidized low-rank coals. A Varian Associates VXR-300 NMR spectrometer operating at 75.4 \\{MHz\\} (13C) equipped with a Doty, Scientific, Inc. high-speed cross-polarization/magic angle probe was employed. Solid-state Bloch decay 13C NMR spectra were determined using 90 carbon pulse, 74 kHz dipolar proton decoupling during acquisition, and a 200-s recycle delay with 13 kHz magic angle spinning. The probe and sample rotor exhibited a background signal amounting to ca. 20% of the total intensity of the coal spectrum, and required careful FID scaling and subtraction of the signal obtained from the empty rotor and caps. CP/MAS spectra were determined at variable contact times from 25 ?S to 25 ms, with 5 s recycle times. The chapter presents a comparison of CP/MAS and Bloch decay results for the Argonne premium coals, a standard humic acid, and for a selection of oxidized coals.

J.C. Linehan; J.A. Franz

1991-01-01T23:59:59.000Z

28

Roles of chemically inequivalent N(CH3)4 ions in phase transition temperatures in [N(CH3)4]2CoCl4 by single-crystal NMR and MAS NMR  

Science Journals Connector (OSTI)

Abstract The temperature dependences of the 1H and 13C spinlattice relaxation time in the laboratory frame, T1, and in the rotating frame, T1?, in [N(CH3)4]2CoCl4 were measured by static nuclear magnetic resonance (NMR) and magic angle spinning (MAS) NMR. In the ferroelastic phase, 1H T1? underwent molecular motion according to the BloembergenPurcellPound theory. Two inequivalent ions, a-N(CH3)4 and b-N(CH3)4, were identified by 13C cross polarization (CP)/MAS NMR. On the basis of the 13C NMR results, the existence of two chemically inequivalent a-N(CH3)4 and b-N(CH3)4 ions in the ferroelectric phase and the existence of the ferroelastic twin structure of the N(CH3)4 ions in the ferroelastic phase were discussed.

Ae Ran Lim

2014-01-01T23:59:59.000Z

29

MAS.961 Designing Sociable Media, Spring 2001  

E-Print Network [OSTI]

This course is about social life in the on-line world. Its focus is on how the design of the interface influences people's interactions with each other and shapes the cultural mores and structures they develop. We will ...

Donath, Judith S.

30

Enriching a MAS Environment with Institutional Services  

Science Journals Connector (OSTI)

Most environments for multi-agent systems limit themselves to providing message transport and white/yellow page services. While these are generic facilities, in some domains other services are necessary, which...

Andreia Malucelli; Henrique Lopes Cardoso

2006-01-01T23:59:59.000Z

31

MAS.963 Ambient Intelligence, Spring 2004  

E-Print Network [OSTI]

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 ...

Maes, Patricia

32

Scheduling on the MasPar SIMD parallel computer  

E-Print Network [OSTI]

Algorithm . Page lv Vl V 1 1 7 8 11 15 17 17 20 24 25 25 26 29 31 35 38 38 40 40 41 CHAPTER VI FURTHER RESEARCH AND CONCLUSIONS . A. Further Research B. Conclusions. . . REFERENCES APPENDIX . . VITA Page 43 43 44 LIST.../Graham algorithm. . 13 5 A time line of the tasks from Figure 4 on processors PO and Pl. . 13 6 The ixproc numbering for each processor. 7 The iyproc numbering for each processor. 18 19 8 The dark processor can communicate with any of the light proces- sors...

Perkins, Keith Douglas

1995-01-01T23:59:59.000Z

33

QUEEN MARY, UNIVERSITY OF LONDON MAS 314 Design of Experiments  

E-Print Network [OSTI]

in the construction of underwater structures at sea, such as piers and oil-drilling platforms. He wants to protect

Bailey, R. A.

34

Small Red Lesions Detection Using a MAS Approach  

Science Journals Connector (OSTI)

Microaneurysms are the diabetic retinopathy first sign and its early detection is crucial for blindness prevention. Several approaches can be found in literature for the automatic microaneurysm segmentation, b...

Carla Pereira; Diana Veiga; Jason Mahdjoub

2013-01-01T23:59:59.000Z

35

Engineering MAS ? A Device Integration Framework for Smart Home Environments  

Science Journals Connector (OSTI)

We introduce a layered approach to multi-agent programming and motivate this with a perspective to smart home environments. Apart from the core layer, layer components can be updated at runtime to reflect, e.g., attributes like credibility and the addition ... Keywords: Home Automation, Layered Architecture, Multi-Agent Systems, Smart Home

Jack Betts, Berndt Mller

2014-10-01T23:59:59.000Z

36

MAS.110 Fundamentals of Computational Media Design, Spring 2003  

E-Print Network [OSTI]

Introduces principles of analysis and synthesis in the computational medium. Expressive examples that illustrate the intersection of computation with the traditional arts are developed on a weekly basis. Hands-on design ...

Maeda, John

37

The Indiana MAS Project: Goals and Preliminary Results  

E-Print Network [OSTI]

. Martelli, M. Ancona Dipartimento di Informatica, Bioingegneria, Robotica e Ingegneria dei Sistemi (Dipartimento di Informatica, Bioingegneria, Robotica e Ingeg- neria dei Sistemi) and Salerno (Dipartimento di

Mascardi, Viviana

38

MAS-4203: Theory of Numbers Syllabus Spring 2011  

E-Print Network [OSTI]

3301, MTG4302 or MAD2104. It is the student's responsibility to check and prove eligibility. Text. Failure to process a course drop will result in a grade of F. Exam Policy: No makeup tests will normally and responsibilities of students and faculty members throughout the process. Students are responsible for reading

Bowers, Philip L.

39

Surveillance Guide - MAS 10.3 Seasonal Preparation  

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

SEASONAL PREPARATION SEASONAL PREPARATION 1.0 Objective The objective of this surveillance is to verify that the contractor is implementing appropriate measures to protect equipment and systems from damage due to the effects of cold weather. The Facility Representative evaluates systems necessary for the protection of the public and workers to determine if they have been adequately prepared for cold weather. The Facility Representative also examines other preparations for cold weather to ensure that materials are properly stored, permanent and auxiliary heating systems are functional, and other appropriate preparations have been completed. During the surveillance, the Facility Representative ensures that applicable DOE requirements have been implemented.

40

DOI: 10.1002/adsc.201000585 Synthesis, Immobilization, MAS and HR-MAS NMR of a New  

E-Print Network [OSTI]

on silica with their phosphonium moieties via electro- static interactions, and their mobility and leaching- vents. Immobilized Wilkinson-type rhodium com- plexes have been obtained by ligand exchange nanoparticles Introduction Catalysts immobilized on solid supports are of grow- ing academic and industrial

Bluemel, Janet

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Surveillance Guide - MAS 10.2 Control of Measuring and Test Equipment  

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

CONTROL OF MEASURING AND TEST EQUIPMENT 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, devices or systems used to inspect, test, calibrate, measure or troubleshoot safety related alarms, sensors, and detectors. Surveillance activities provide a basis for evaluating the effectiveness of the contractor's program as well as compliance with DOE requirements. 2.0 References 2.1 DOE 4330.4B, Maintenance Management Program 2.2 DOE 5700.6C, Quality Assurance 3.0 Requirements Implemented This surveillance is conducted to implement requirements MA-0003 and MA-0004 from the RL S/RID. These requirements are drawn from DOE 4330.4B.

42

Microsoft Word - 1817 Report incl GC&OMB Comments 8 20 07mas2.doc  

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

POTENTIAL BENEFITS OF DISTRIBUTED POTENTIAL BENEFITS OF DISTRIBUTED GENERATION AND RATE-RELATED ISSUES THAT MAY IMPEDE ITS EXPANSION A STUDY PURSUANT TO SECTION 1817 OF THE ENERGY POLICY ACT OF 2005 June 2007 U.S. Department of Energy EPAct 2005 SEC. 1817. STUDY OF DISTRIBUTED GENERATION. (a) Study- (1) IN GENERAL- (A) POTENTIAL BENEFITS- The Secretary, in consultation with the Federal Energy Regulatory Commission, shall conduct a study of the potential benefits of cogeneration and small power production. (B) RECIPIENTS- The benefits described in subparagraph (A) include benefits that are received directly or indirectly by-- (i) an electricity distribution or transmission service provider; (ii) other customers served by an electricity distribution or transmission service provider; and

43

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

E-Print Network [OSTI]

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, ...

Minsky, Marvin

44

Genome sequence of the moderately thermophilic halophile Flexistipes sinusarabici strain (MAS10T)  

SciTech Connect (OSTI)

Flexistipes sinusarabici Fiala et al. 2000 is the type species of the genus Flexistipes in the fami- ly Deferribacteraceae. The species is of interest because of its isolated phylogenetic location in a genomically under-characterized region of the tree of life, and because of its origin from a multiply extreme environment; the Atlantis Deep brines of the Red Sea, where it had to struggle with high temperatures, high salinity, and a high concentrations of heavy metals. This is the fourth completed genome sequence to be published of a type strain of the family Deferribacteraceae. The 2,526,590 bp long genome with its 2,346 protein-coding and 53 RNA genes is a part of the Genomic Encyclopedia of Bacteria and Archaea project.

Lapidus, Alla L. [U.S. Department of Energy, Joint Genome Institute; Chertkov, Olga [Los Alamos National Laboratory (LANL); Nolan, Matt [U.S. Department of Energy, Joint Genome Institute; Lucas, Susan [U.S. Department of Energy, Joint Genome Institute; Hammon, Nancy [U.S. Department of Energy, Joint Genome Institute; Deshpande, Shweta [U.S. Department of Energy, Joint Genome Institute; Cheng, Jan-Fang [U.S. Department of Energy, Joint Genome Institute; Tapia, Roxanne [Los Alamos National Laboratory (LANL); Han, Cliff [Los Alamos National Laboratory (LANL); Goodwin, Lynne A. [Los Alamos National Laboratory (LANL); Pitluck, Sam [U.S. Department of Energy, Joint Genome Institute; Liolios, Konstantinos [U.S. Department of Energy, Joint Genome Institute; Pagani, Ioanna [U.S. Department of Energy, Joint Genome Institute; Ivanova, N [U.S. Department of Energy, Joint Genome Institute; Huntemann, Marcel [U.S. Department of Energy, Joint Genome Institute; Mavromatis, K [U.S. Department of Energy, Joint Genome Institute; Mikhailova, Natalia [U.S. Department of Energy, Joint Genome Institute; Pati, Amrita [U.S. Department of Energy, Joint Genome Institute; Chen, Amy [U.S. Department of Energy, Joint Genome Institute; Palaniappan, Krishna [U.S. Department of Energy, Joint Genome Institute; Land, Miriam L [ORNL; Hauser, Loren John [ORNL; Brambilla, Evelyne-Marie [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Rohde, Manfred [HZI - Helmholtz Centre for Infection Research, Braunschweig, Germany; Abt, Birte [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Spring, Stefan [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Goker, Markus [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Bristow, James [U.S. Department of Energy, Joint Genome Institute; Eisen, Jonathan [U.S. Department of Energy, Joint Genome Institute; Markowitz, Victor [U.S. Department of Energy, Joint Genome Institute; Hugenholtz, Philip [U.S. Department of Energy, Joint Genome Institute; Kyrpides, Nikos C [U.S. Department of Energy, Joint Genome Institute; Klenk, Hans-Peter [DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany; Woyke, Tanja [U.S. Department of Energy, Joint Genome Institute

2011-01-01T23:59:59.000Z

45

A Prolog-Based MAS for Railway Signalling Monitoring: Implementation and Experiments  

E-Print Network [OSTI]

- ployed for monitoring and controlling the cycle of generating, transporting and distributing electrical private energy groups [8]. ARCHON's Planning and Coordination Module was implemented as a rule- based for their implementation. I. INTRODUCTION Distributed diagnosis and monitoring represent one of the oldest application

Mascardi, Viviana

46

SoMAS alumni have gone on to careers as: Acting Director, NY Sea Grant  

E-Print Network [OSTI]

· Environmental Affairs Officer on Marine & Coastal Biodiversity, UNEP Secretariat of Convention on Biological & Facilities Specialist, NY Sea Grant Extension · Director, Center for Marine & Wetland Studies, Conway, SC, Dewberry, Fairfax, VA · Marine Conservation Project Director, The Nature Conservancy · Marine Ecologist

Zhang, Minghua

47

MAS.622 / 1.126J Pattern Recognition & Analysis, Fall 2000  

E-Print Network [OSTI]

Fundamentals of characterizing and recognizing patterns and features of interest in numerical data. Basic tools and theory for signal understanding problems with applications to user modeling, affect recognition, speech ...

Massachusetts Institute of Technology. Media Laboratory.

48

Bulletin SEV/VSE 9/04 59 ten Umstellung auf das Bachelor-und Mas-  

E-Print Network [OSTI]

Schweizer Windenergie- vereinigung, hat ihren Blick nach Süden ge- richtet. Am 6. Februar 2004 organisierte

Walsworth, Ronald L.

49

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

E-Print Network [OSTI]

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. ...

Markhasin, Evgeny

2014-01-01T23:59:59.000Z

50

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

E-Print Network [OSTI]

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 ...

Massachusetts Institute of Technology. Media Laboratory.

51

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

E-Print Network [OSTI]

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, ...

Resnick, Mitchel

52

Surveillance Guide - MAS 10.1 Implementation of the Integrated Safety Management System Process in Maintenance Activities  

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

Implementation of the Integrated Safety Management System (ISMS) Process in Implementation of the Integrated Safety Management System (ISMS) Process in Maintenance Activities 1.0 Objective The objective of this surveillance is to evaluate the effectiveness of the contractor's ISMS process with regard to maintenance activities. Surveillance activities encompass work planning and control, equipment status control, performance of maintenance, return to service, and closeout documentation. 2.0 References 2.1 DOE 4330.4B Maintenance Management Program 2.2 DOE 5480.19 Conduct of Operations for DOE Facilities 2.3 48 CFR 970.5204-2 Implementation of Environment, Safety, and Health into Work Planning and Execution 2.4 10 CFR 830.120 Quality Assurance 3.0 Requirements Implemented This surveillance is conducted to implement requirements of the

53

Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by 29Si MAS NMR and vibrational spectroscopy  

Science Journals Connector (OSTI)

...technological and industrial applications (e.g., desiccants, aerogels, SiO2 films in semiconductors). In natural settings, amorphous...1990) NMR determination of the fractal dimension in silica aerogels. Physical Review Letters, 65, 614-617. Engelhardt, G...

Steven M. Chemtob; George R. Rossman; Jonathan F. Stebbins

54

A data-parallel view of the load balancing experimental results on MasPar MP-1  

Science Journals Connector (OSTI)

In this paper, we present several methods for load balancing data in a SIMD computer. There are two ... an easy example, we showed that dynamic load balancing for SIMD data-parallel computers can really improve t...

Cyril Fonlupt; Philippe Marquet

1994-01-01T23:59:59.000Z

55

Vacancy association energy in scandium doped ceria: 45Sc MAS NMR and 2D exchange spectroscopy study  

Science Journals Connector (OSTI)

Abstract Oxygen vacancy exchange between Sc ions in 0.5% Sc-doped ceria Sc0.005Ce0.995O0.9975 is investigated by means of 2D exchange spectroscopy (EXSY). 45Sc NMR spectrum of Sc-doped ceria contains two peaksone corresponding to Sc ions coupled with an oxygen vacancy (Sc-7), and the other corresponding to Sc ions in a regular lattice site surrounded by eight oxygen ions (Sc-8). The vacancy exchange between these two Sc sites generates the cross-peaks in the EXSY spectrum. Relative amplitudes of the cross-peaks provide direct values of the exchange frequency at a given temperature. Arrhenius analysis of the exchange frequency gives the activation energy Ea=1.18eV for the vacancy hopping between Sc sites. Most of this energy barrier is due to association energy which binds the vacancy to Sc3+. Large dopantvacancy association energy in Sc doped ceria is demonstrated by 45Sc NMR spectrum of La/Sc doubly doped sample, ScxLaxCe1?2xO2?x, x=0.005, where the only line of Sc-7 site shows that all vacancies are bound by Sc3+ ions.

Reio Pder; Juhan Subbi; Helgi Kooskora; Ivo Heinmaa

2014-01-01T23:59:59.000Z

56

Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by 29Si MAS NMR and vibrational spectroscopy  

Science Journals Connector (OSTI)

...included a volcanically derived silica coating on young basalt from Kilauea, Hawaii...sites, respectively. The Hawaiian silica coating and silicic acid samples displayed high...the structural Si-OH content of the coating was unusually high for a natural silica...

Steven M. Chemtob; George R. Rossman; Jonathan F. Stebbins

57

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

E-Print Network [OSTI]

The process of conversion of methanol to hydrocarbons (MTH) over H-ZSM-5 zeolites, developed by Mobil Oil Co hydrocarbon mixtures rich in the gasoline fraction (MTG) or low chain olefins (MTO) [3,4]. As feedstock, the MTH processes in general suffer from problems of selectivity and cata- lyst deactivation

Sklenak, Stepan

58

With more than 90% of all stars sharing fates similar to that of the Sun, more mas-  

E-Print Network [OSTI]

al. monitored the -Cephei star HD 129929 (with a mass of 9.5 solar mass- es) for more than 21 years of convection in its central nuclear furnace drives mixing of material beyond the "classi- cal" limits cooling track--the last part of this evolution for stars of less than ~8 solar masses (M

Melbourne, Timothy

59

MAS 10.1 Implementation of the Integrated Safety Management System (ISMS) Process in Maintenance Activities, 2/14/2000  

Broader source: Energy.gov [DOE]

The objective of this surveillance is to evaluate the effectiveness of the contractor's ISMS process with regard to maintenance activities. Surveillance activities encompass work planning and...

60

PERSONAL RECORD DUDLEY STARK  

E-Print Network [OSTI]

232 Statistical Modelling I MAS 106 Matrices and Geometry MAS 108 Probability I 2002­2003 MAS 106 Matrices and Geometry MAS 108 Probability I MAS 109 Statistics I MAS 224 Actuarial Mathematics 2001­2002 MAS 106 Matrices and Geometry MAS 108 Probability I MAS 109 Statistics I 2000­2001 MAS 106 Matrices

Banaji,. Murad

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to obtain the most current and comprehensive results.


61

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

E-Print Network [OSTI]

Introduction Lithium-ion batteries have played a centralas current commercial Li-ion batteries currently do not meetnext generation of batteries designed for transportation '

Cabana, Jordi

2010-01-01T23:59:59.000Z

62

MAS 552 / 4.557 Innovation Hubs, Integrating Technology + Design [QUITO LAB] MIT Spring 2014, 1:30 -4:30 pm  

E-Print Network [OSTI]

, students are challenged to focus on diverse fields for their proposals, such as social innovation, city/analysis/data collection/project design 3) Project development + Social Revolution: project development/social innovation-Deliktum / Social innovation MARCH 12 *Robin Chase / Zipcar founder / Social Entrepreneurship MARCH 19 *Nicco Mele

63

2.10 Multiscale Actuated Sensing (MAS) Multiscale actuated sensing research activities have focused on the core algorithmic challenges of incorporating rich  

E-Print Network [OSTI]

arrive and leave. Similarly, measuring CO2 flux from a plant requires placing the plant inside a growth. Using this method we measure a 6x improvement (24x with compression) in file transfer speed, compared

California at Los Angeles, University of

64

Elemental and structural analysis of silicon forms in herbal drugs using silicon-29 MAS NMR and WD-XRF spectroscopic methods  

Science Journals Connector (OSTI)

The objective of this work was to study concentration of silicon and its structural forms present in herbal drugs. Equisetum arvense and Urtica dioica L. from teapot bags, dietary supplements (tablets and capsules) containing those herbs, dry extract obtained from a teapot bag of E. arvense, and samples of the latter herb harvested in wild habitat over four months were studied using wavelength dispersive X-ray spectroscopy (WD-XRF) and high-resolution solid-state 29Si NMR. The highest concentration of Si, ca. 27mg/g, was found in the herbal material from the teapot bags containing E. arvense. The Si content in natural E. arvense (whole plants) increased from May to August by ca. 7mg/g, reaching value 26mg/g. Three different silicon forms were detected in the studied herbal samples: Si(OSi)4 (Q4), Si(OH)(OSi)3 (Q3) and Si(OH)2(OSi)2 (Q2). Those sites were populated in E. arvense in the following order: Q4?Q3>Q2. A dramatic, ca. 50-fold decrease of the Si concentration during the infusion process was observed. The infusion process and the subsequent drying procedure augmented population of the Q4 sites at the cost of the Q2 sites. The WD-XRF and 29Si NMR methods occurred useful and complementary in the study of herbal materials.

L. Pajchel; P. Nykiel; W. Kolodziejski

2011-01-01T23:59:59.000Z

65

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

E-Print Network [OSTI]

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 ...

Bayro, Marvin J.

66

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]

paraphernalia (i.e. , cookers, cotton, rinse water) at leasti.e. , cotton filter, cookers, rinse water) that had beenparaphernalia (i.e. , cotton, cooker, rinse-water), city of

2012-01-01T23:59:59.000Z

67

Flash2007-33RevenueTierDiscounts.rtf  

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

REVENUE TIER DISCOUNT REVENUE TIER DISCOUNT S* Service Category Baseline $0-$9M Tier 1 $10-34M Tier 2 $ 35-74M Tier 3 $75-149M Tier 4 $150-199M Tier 5 $200M+ Express Next Day First AM MAS MAS MAS MAS MAS MAS Express Next Day Mid-Morning MAS 21.9% 24.0% 26.9% 29.2% 30.2% Express Next Day Afternoon MAS 21.9% 24.0% 26.9% 29.2% 30.2% Express Second Day MAS 21.9% 24.0% 26.9% 29.2% 30.2% Express Third Day MAS 21.9% 24.0% 26.9% 29.2% 30.2% Intl Priority - Puerto Rico MAS MAS MAS MAS MAS MAS Intl Economy - Puerto Rico MAS MAS MAS MAS MAS MAS Same Day Service MAS MAS MAS MAS MAS MAS Standard Ground** MAS 1.7% 4.8% 13.2% 15.2% 17.3% Ground $4,000 - $40,000** Not Offered 4.8% 11.1% 15.2% 17.3% 27.9% Ground $40,000+" Not Offered 39.2% 39.2% 39.2% 39.2% 39.2% *Discounts shown EXCLUDE the waiver of fuel surcharges and are thus understated

68

Fluorine Speciation Analysis Using Reverse Phase Liquid Chromatography Coupled Off-Line to Continuum Source Molecular Absorption Spectrometry (CS-MAS): Identification and Quantification of Novel Fluorinated Organic Compounds in Environmental and Biological Samples  

Science Journals Connector (OSTI)

(1-4) Perfluorinated compounds (PFCs) are especially well-known for their unusual solubility, being simultaneously hydro- and lipophobic. ... (5, 6) This recognition has triggered a boost in interest in the monitoring of PFCs in water, wildlife and food. ... Chemicals used for AAS modifiers, reported by Gleisner et al.,(17) included gallium nitride (99.9%, ...

Zhiwei Qin; David McNee; Heike Gleisner; Andrea Raab; Kwaku Kyeremeh; Marcel Jaspars; Eva Krupp; Hai Deng; Jrg Feldmann

2012-06-11T23:59:59.000Z

69

500 MHz NMR Shasta (Solids) | EMSL  

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

self-directed operations. Collaborative work with staff scientists is encouraged. Solid-state Magic Angle Spinning (MAS) probes: 4-mm Agilent HXY MAS probe Spinning up to 18 kHz...

70

REACTION OF PHOSPHATE COMPOUNDS WITH A HIGH-SILICA ALLOPHANE  

Science Journals Connector (OSTI)

...loading. The 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectra...mum) using a Na hexametaphosphate dispersant. The elutriated sample was dried...sup> Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectra...

Kiyoshi Okada; Koji Nishimuta; Yoshikazu Kameshima; Akira Nakajima; Kenneth J. D. MacKenzie

71

E-Print Network 3.0 - aumenta os conhecimentos Sample Search...  

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

mas relacionados aquisio automtica de conhecimento ... Source: Calheiros, Rodrigo N. - Cloud Computing and Distributed Systems Laboratory, University of Melbourne...

72

Evaluating demographic models for goat domestication using mtdna sequences  

E-Print Network [OSTI]

(UGI) University College London, Gower Street, London WC1E 6BT (United Kingdom) Mark G. thoMas Research

73

The European Extremely Large TelescopeThe European Extremely Large Telescope Project OverviewProject Overview  

E-Print Network [OSTI]

area: 382 m2 655 m2 978 m2 Diff. limit at 1µm: 9.9 mas 8.4 mas 6.4 mas #12; Current rings of segments: Largest fully enclosed D Circumscribing D Area Segments. Six laser guide stars (provisions for eight), launched from the side. Nearly 3000 tonnes of moving

Liske, Jochen

74

Revised October 2013 BACHELOR of ARTS DEGREE  

E-Print Network [OSTI]

of Science: (Please see FAU catalog for possible prerequisite courses) MAC MAC MAD MAC MAS STA MAA MAS MTG, or electronically for people with disabilities. Please allow at least 10 days to process this request. #12;Revised MAT CIS MAS MAD MTG MAT

Fernandez, Eduardo

75

Separate-Local-Field NMR Spectroscopy on Half-Integer Quadrupolar Nuclei Julia Grinshtein, Christopher V. Grant, and Lucio Frydman*  

E-Print Network [OSTI]

field of high- resolution spin-1/2 solid-state NMR. Then, separate-local-field (SLF) MAS techniques such SLF measurements to solid-state quadrupolar NMR. Two main differences arise upon invoking SLF MAS distances in bioinorganic complexes, leading to SLF MAS sidebands that are typically too small

Frydman, Lucio

76

ARM - Employment Opportunities Article  

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

Two Faculty Positions in Extreme Weather and Regional Climate Change - Stony Brook University Bookmark and Share The School of Marine and Atmospheric Sciences (SoMAS) at Stony...

77

E-Print Network 3.0 - avant-projet petite centrale Sample Search...  

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

.de-vuyst@ecp.fr Laboratoire MAS Ecole Centrale Paris & CMLA ENS Cachan Institut FARMAN - Ecole Normale ... Source: Ecole Normale Suprieure de Cachan, Centre de...

78

Fiche DIGISCOPE 28 aot 1 / 4 Projet d'Equipement d'Excellence -DIGISCOPE  

E-Print Network [OSTI]

­?le-de-France INRIA LTCI Institut Telecom / CNRS MAS Ecole Centrale EM2C CNRS / Ecole Centrale Institut Farman ENS

79

E-Print Network 3.0 - aids entre jogadores Sample Search Results  

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

de game multi-mouse sobre o Bioma Mata Atlntica Ana Beatriz Bahia Cristina Santos Emlio Takase Summary: competem entre si, mas precisam realizar uma meta comum. Cada...

80

E-Print Network 3.0 - acontecimientos adversos por Sample Search...  

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

de Extensin Cooperativa Facultad de Agricultura y Economa Domstica Para encontrar mas recursos para negocios, el hogar la familia, visite la Facultad de Agricultura y Economa...

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

E-Print Network 3.0 - adaptativo robusto para Sample Search Results  

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

mas eficiente y rapida se realiza de forma comprimida. Por otro lado, para el almacenamiento de Source: Amat, Sergio - Departamento de Matemtica Aplicada y Estadstica,...

82

Narrative and (Meta)Physical Paradox in "Grande Sertao: Veredas" and "Pedro Paramo"  

E-Print Network [OSTI]

respostas j conhece de antemo. Vim como combinamos porquecontei, remexer vivo o que vim dizendo. Porque no narreipreso. Diadorim e eu viemos, vim; de rota abatida. Mas,

Schneider, Caroline LeFeber

2011-01-01T23:59:59.000Z

83

Sexual partner concurrency among female sex workers and their intimate male partners in two Mexico-U.S. border cities  

E-Print Network [OSTI]

Su relacin? ? Finanzas? ? Sexo? Uso condn con sua usar condones, no tuvo sexo, paro de verse con otrasde transmisin sexual o sexo ms seguro mas en general? 11.

Robertson, Angela Marie; Robertson, Angela Marie

2012-01-01T23:59:59.000Z

84

E-Print Network 3.0 - axotomizado del perro Sample Search Results  

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

Apellido Nombre Inicial del segundo nombre Domicilio... ,000 Sexo: ( ) Nativo Hawaiano o Islas del Pacifico ( ) Suburbio mas de 50,000 ( ) Masculino ( )...

85

Non-axisymmetric Flows  

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

exploited to achieve high performance plas- mas in MST. The advancement of the RFP as a thermonuclear fusion reactor hinges on a complete and fundamental understanding of the...

86

An Extended Process Automation System: An Approach Based on a Multi-Agent System.  

E-Print Network [OSTI]

??This thesis describes studies on application of multi-agent systems (acronym: MAS) to enhance process automation systems. A specification of an extended process automation system is (more)

Seilonen, Ilkka

2006-01-01T23:59:59.000Z

87

An extended process automation system : an approach based on a multi-agent system.  

E-Print Network [OSTI]

??This thesis describes studies on application of multi-agent systems (acronym: MAS) to enhance process automation systems. A specification of an extended process automation system is (more)

Seilonen, Ilkka

2006-01-01T23:59:59.000Z

88

E-Print Network 3.0 - adolescentes um estudo Sample Search Results  

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

mais eficaz de estudo, mas ocasionalmente esta Source: Instituto de Sistemas e Robotica - Polo de Lisboa (Institute for Systems and Robotics, Lisbon pole) Portugal...

89

E-Print Network 3.0 - atmosfericas um estudo Sample Search Results  

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

mais eficaz de estudo, mas ocasionalmente esta Source: Instituto de Sistemas e Robotica - Polo de Lisboa (Institute for Systems and Robotics, Lisbon pole) Portugal...

90

E-Print Network 3.0 - auto-imune um estudo Sample Search Results  

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

mais eficaz de estudo, mas ocasionalmente esta Source: Instituto de Sistemas e Robotica - Polo de Lisboa (Institute for Systems and Robotics, Lisbon pole) Portugal...

91

mitchell(1)-98.pdf  

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

(McFarquhar and Heymsfield 1996). The objective of this study was to compare visible and near infrared reflectances predicted from the observed microphysics with MAS reflectances,...

92

A platform-independent metamodel for multiagent systems  

Science Journals Connector (OSTI)

Various agent-oriented methodologies and metamodels exist to design and develop multiagent systems (MAS) in an abstract manner. Frequently, these frameworks specialise on particular parts of the MAS and only few works have been invested to derive a common ... Keywords: Agent modelling, Agent oriented, Agent oriented software engineering, BDI, JACK, JADE, Metamodelling, Model driven architecture, PIM, PIM4AGENTS, PSM

Christian Hahn; Cristin Madrigal-Mora; Klaus Fischer

2009-04-01T23:59:59.000Z

93

E-Print Network 3.0 - agudo del lactante Sample Search Results  

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

d )(d )v... max s TT2 v a t t t 2 smax smax smax 12;Dinmica del MAS sKsmamF -- 2 2 mK ( ) ( ) 2 2 total... ;Dinmica del MAS s TT2 tsmax 2 max 2 1 sK t cintica...

94

E-Print Network 3.0 - agudo del miocardio Sample Search Results  

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

d )(d )v... max s TT2 v a t t t 2 smax smax smax 12;Dinmica del MAS sKsmamF -- 2 2 mK ( ) ( ) 2 2 total... ;Dinmica del MAS s TT2 tsmax 2 max 2 1 sK t cintica...

95

E-Print Network 3.0 - agudo del alcl3 Sample Search Results  

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

d )(d )v... max s TT2 v a t t t 2 smax smax smax 12;Dinmica del MAS sKsmamF -- 2 2 mK ( ) ( ) 2 2 total... ;Dinmica del MAS s TT2 tsmax 2 max 2 1 sK t cintica...

96

T-695: Avaya Aura Application Server Buffer Overflow in 'cstore...  

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

with System privileges. Solution: The vendor has issued a fix: MAS 2.0 users install Patch Bundle 10 or later. MAS 1.0 users upgrade to 1.0.2 (MCP11.0.0.02011-01-07-1526 with...

97

Conceptual configurations of an accelerator-driven subcritical system utilizing minor actinides  

SciTech Connect (OSTI)

This paper purposes an Accelerator-Driven Subcritical (ADS) system which utilizes the Minor Actinides (MAs) from the US spent nuclear fuel inventory. A mobile fuel concept with micro-particles suspended in the liquid metal is adopted in the purposed system to avoid difficulties of developing and testing new MAs solid fuel forms. Three ADS configurations were developed and analyzed using the Monte Carlo fuel burnup methodology. The analyses demonstrated the capabilities of the proposed system to utilize the MAs and to dispose of the US spent nuclear fuels. (authors)

Cao, Y.; Gohar, Y. [Nuclear Engineering Div., Argonne National Laboratory, 9700 South Cass Ave., IL 60439 (United States)

2012-07-01T23:59:59.000Z

98

SAFARI 2000 MODIS Airborne Simulator Data  

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

Airborne Simulator Data Airborne Simulator Data The ORNL DAAC announces the release of a new SAFARI 2000 data set. The data set "SAFARI 2000 MODIS Airborne Simulator Data, Southern Africa, Dry Season 2000" contains MODIS Airborne Simulator (MAS) multispectral data collected during the SAFARI 2000 project. Twenty flights with the MAS instrument were undertaken over Southern Africa by the NASA ER-2 aircraft during August and September 2000. The MAS spectrometer collects 50 multispectral bands at 16-bit resolution with a ground resolution of 50 meters from 20,000 meters altitude and a cross track scan width of 85.92 degrees. This data set is organized by flight, and each flight consists of several straight-line segments called tracks. There is a MAS multispectral data file for each track. The data are available in Hierarchical Data Format

99

Corrado Mascia Sapienza, Universit di Roma  

E-Print Network [OSTI]

), Parigi (Francia). professore visitatore maggio 2014 ?cole Centrale de Paris, Laboratoire MAS (Mathematics Applied to Systems), Parigi (Francia). professore visitatore Attività scientifica Interessi di ricerca

Mascia, Corrado

100

Gordon Research Conferences  

Science Journals Connector (OSTI)

...diagnostics ap-plicable to thermal plasmas"; Richard Gottscho, "Diagnostics in RF plasmas." 14 August. Ions in...devel-opments and trends in thermal plasma chemical processing...radiation." 16 August. Large-scale thermal plas-mas...

Alexander M. Cruickshank

1984-03-02T23:59:59.000Z

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

On emergent complex behaviour, self-organised criticality and phase transitions in multi-agent systems: autonomy oriented computing (AOC) perspectives  

Science Journals Connector (OSTI)

In a Multi-Agent System (MAS), there usually exist system-level goals that agents are collectively trying to attain. Generally speaking, the local behaviours and performances of individual agents directly determine which global characteristics of an MAS, for example, the global performance and/or patterns, will emerge and how the system-level goals will be attained. In most cases, such a local??global relationship is neither obvious nor straightforward. In this paper, we will address several issues on modelling emergent complex behaviours in MAS. In particular, we will focus on the local??global relationship in a Self-Organising MAS (SOMAS), and discuss the phenomena of Self-Organised Criticality (SOC) and phase transition in SOMAS.

Jiming Liu; Bingcheng Hu

2008-01-01T23:59:59.000Z

102

Gordon Research Conferences  

Science Journals Connector (OSTI)

...the ACE2-Ang(1-7)-Mas Receptor Axis (Robson Santos / Rodrigo Fraga-Silva / Stuart Nicklin / Kathleen Rodgers) Aortic...Mitochondria: Redox Organelles (John J. Lemasters / Janine Santos / Orian Shirihai / Kostas Tokatlidis / Marcelo Bonini...

2013-09-27T23:59:59.000Z

103

Geophysics in the public service  

Science Journals Connector (OSTI)

...pending offshore Louisiana drilling campaign. Following...southern Mississippis Tatum salt dome to a massive five megaton...International Deep-Sea Drilling Project were generating...southern Mississippi's Tatum salt dome to a mas-sive five...

Charles C. Bates

104

Gordon Research Conferences  

Science Journals Connector (OSTI)

...be announced). Conduction and charge storage in dual dielectrics (T. W. Hickmott...Balk, "Conduction through and charge storage in MAS, MAOS, and MANOS systems...energy transfer and reactivity in laser pumped molecules." 18 July. Dieter Perner...

Alexander M. Cruickshank

1978-03-10T23:59:59.000Z

105

Evolving Protocols and Agents in Multiagent Systems Scott N. Gerard  

E-Print Network [OSTI]

Evolving Protocols and Agents in Multiagent Systems Scott N. Gerard Department of Computer Science (AA- MAS 2013), Ito, Jonker, Gini, and Shehory (eds.), May, 6­10, 2013, Saint Paul, Minnesota, USA

106

Marilyn L. Dillon  

Broader source: Energy.gov [DOE]

As Director of the Office of Resource Management and Planning, Ms. Dillon is responsible for managing the day-to-day operations of the Office of Managements (MAs) human resources,...

107

Cryogenic sample exchange NMR probe for magic angle spinning dynamic nuclear polarization  

E-Print Network [OSTI]

We describe a cryogenic sample exchange system that dramatically improves the efficiency of magic angle spinning (MAS) dynamic nuclear polarization (DNP) experiments by reducing the time required to change samples and by ...

Barnes, Alexander B.

108

Fachbereich Physik an der TU Kaiserslautern | Hochschulranking auf ZEIT ONLINE http://ranking.zeit.de/che2012/de/fachbereich/400161?ab=3[30.04.2012 15:20:12  

E-Print Network [OSTI]

Physik (B), Physik (B.Ed.), Physik (M), Physik (M.Ed.) Chemie an der TU Kaiserslautern: Fachbereich Chemie Chemie (B), Chemie (B, LA), Chemie (M), Chemie (M, LA Gym), Chemie (Mas, LA Real plus) Mathematik

Pinnau, René

109

A Framework for Evaluation of Multi-Agent System Approaches to Logistics Network Management  

Science Journals Connector (OSTI)

We study the applicability of multi-agent systems (MAS) to production and logistics network management. The goal is to create and evaluate sets of intelligent agents that can cooperatively support production a...

Paul Davidsson; Fredrik Wernstedt

2004-01-01T23:59:59.000Z

110

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

E-Print Network [OSTI]

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

Bell, Alexis T.

111

Honeywell modular automation system computer software documentation  

SciTech Connect (OSTI)

This document provides a Computer Software Docuemntation 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-21I.

Cunningham, L.T.

1997-01-20T23:59:59.000Z

112

Societies and Academies  

Science Journals Connector (OSTI)

... . A. Gunther gave a notice of two large extinct lizards formerly inhabiting the Mas-carene Islands. The remains of the bones had been partly obtained by Mr. Edward Newton ...

1877-04-05T23:59:59.000Z

113

The Dodo and the Aphanapteryx  

Science Journals Connector (OSTI)

... from life by a competent artist. This bird, like the dodo, inhabited the Mas-carene Islands and a figure of it long unrecognised appeared in Strickland and Melville's volume ...

GRAHAM RENSHAW

1933-05-20T23:59:59.000Z

114

Lord Rothschild, F.R.S  

Science Journals Connector (OSTI)

... Islands, took up the study of the giant tortoises restricted to the Galapagos and Mas-carene Islands, and of marsupials, and supported all measures for the protection of animals and ...

KARL JORDAN

1937-10-02T23:59:59.000Z

115

CEES Peer-Reviewed Publications from 2013  

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

Zhu, and A. A. Gewirth, "Identifying Lithium-Air Battery Discharge Products through 6Li Solid-State MAS and 1H-13C Solution NMR Spectroscopy," J. Power Sources, 235, 87-94 (2013)....

116

Novel and Optimized Materials Phases for High Energy Density...  

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

Soc. 158 (2011) A997 Neutron Diffraction 6 Li MAS NMR 7 Technical accomplishments: Identification of electrochemical proxies 2032 coin cell 1M LiPF 6 in ECDEC (1:1 vv) 3.5...

117

Tridentate Phosphine Linkers for Immobilized Catalysts: Development and Characterization of Immobilized Rhodium Complexes and Solid-State NMR Studies of Polymers  

E-Print Network [OSTI]

) polymers. 13C CP/MAS (cross polarization with magic angle spinning) NMR and IR spectroscopy reveal that PEEK polymers show no detectable chemical change on the molecular level, while PPS polymers display signs of oxidation of the thioether group...

Guenther, Johannes 1983-

2012-08-16T23:59:59.000Z

118

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

E-Print Network [OSTI]

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, ...

Lewandowski, Jozef R.

119

For only the second time, a scientist at Brigham Young University has won the  

E-Print Network [OSTI]

, a faculty member in the Statistics Department, tackled some mas- sive amounts of sales tax data to deter rates. By looking over the past fifteen years of tax records for ev- What would you be willing to do

Seamons, Kent E.

120

E-Print Network 3.0 - astrograph catalog ucac3 Sample Search...  

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

to possible systematic errors). Analysis of systematic... of six constant was used for reduction. Error unit of weight (Ex(1),Ey(1)) is 120 to 180 mas. ... Source: Ecole...

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

revised January 2009 Formulario de Inscripcin para Voluntario de 4-H  

E-Print Network [OSTI]

,000 Sexo: ( ) Nativo Hawaiano o Islas del Pacifico ( ) Suburbio mas de 50,000 ( ) Masculino ( ) Blanco o para todos sin tener en cuenta raza, color, religión, sexo, orientación sexual, nacionalidad, edad

Tullos, Desiree

122

E-Print Network 3.0 - amortiguadoras caso del Sample Search Results  

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

del... tiempo en el caso mas favorable, tm, i) O, j) , k) , l) o, del tiempo promedio, tp, m) O, n) , o) , p) o... si los casos base son t(i) i con 6 i 10? ... Source:...

123

E-Print Network 3.0 - a-bomb survivors Sample Search Results  

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

The reason that the A-bomb... depicts lifetime cancer risks from a given low dose of radiation, based on results from A-bomb survivors... .15 200 mAs different organs from these...

124

The duplicate extension for the equal allocation of nonseparable costs  

Science Journals Connector (OSTI)

Subsequently, we introduce a specific axiom, which is a generalization of the two-person standardness axiom of Hart and Mas-Colell (1989), as formulated for the Shapley value. Let ? be a solution on MC. ...

Yu-Hsien Liao

2013-10-01T23:59:59.000Z

125

Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics, pages 871880, Baltimore, Maryland, USA, June 23-25 2014. c 2014 Association for Computational Linguistics  

E-Print Network [OSTI]

Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics, pages 871 a massive aanval op their employ- 871 #12;ment and social rights." Desired output: "Workers are facing a mas

126

Optimization of actinide transmutation in innovative lead-cooled fast reactors  

E-Print Network [OSTI]

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 ...

Romano, Antonino, 1972-

2003-01-01T23:59:59.000Z

127

Solid State Separated-Local-Field NMR Spectroscopy on Half-Integer Quadrupolar Nuclei: Principles and Applications  

E-Print Network [OSTI]

and exemplified. The methods extend separated-local-field magic-angle spinning (SLF MAS) NMR techniques that have and dynamics of a variety of boron-containing samples. These experimental SLF schemes were also extended to 3D

Frydman, Lucio

128

E-Print Network 3.0 - angle spinning nmr Sample Search Results  

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

Summary: field of high- resolution spin-12 solid-state NMR. Then, separate-local-field (SLF) MAS techniques... NMR experi- ments is that which combines relatively fast sample...

129

Foundations on Sand: An Analysis of the First U.S. Occupation of Haiti, 1915-1934  

E-Print Network [OSTI]

of Haitian Studies Occasional Papers Bryant C. Freeman, Ph.D. - Series Editor N 1 - Konstitisvon Repiblik Ayiti, 29 mas 1987. 1994. Pp. vi-106. Haitian-language version (official orthography) of the present Constitution, as translated by Paul Dejean...

Bunce, Peter L.

2003-01-01T23:59:59.000Z

130

NMR Studies of Heat-Induced Transitions in Structure and Cation...  

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

in Structure and Cation Binding Environments of a Strontium-Saturated Swelling Mica. Abstract: In this work we combined Al, Si, F, and Na magic-angle spinning (MAS) nuclear...

131

E-Print Network 3.0 - archamps france 20-24 Sample Search Results  

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

The 2nd International B Conference, Montpellier, France 22.-24.4.1998 10. 5th... - mas de Gran Canaria, Canary Islands, Spain, Feb. 19-23, 2001 16. ZB2002 Conference, Grenoble, ......

132

Minor Actinide Transmutation Potential of Modified PROMETHEUS Fusion Reactor  

Science Journals Connector (OSTI)

This study presents the investigation of the burning and/or transmutation (B/T) of minor actinides (MAs) in the modified PROMETHEUS-H fusion reactor. The calculations were performed for an operation...2.... In or...

Hseyin Yap??c??; Gamze Gen; Nesrin Demir; Bilge eper

2004-06-01T23:59:59.000Z

133

SCHOOL OF MATHEMATICS AND STATISTICS Spring Semester Vectors and Fluids 2 hours  

E-Print Network [OSTI]

stagnation points below the line y = 0. Sketch the flow and determine the lift, i.e. the force in the y Answer four questions. If you answer more than four questions, only your best four will be counted. 1 (i of in the direction (1, 1, 0) at the point (3, 5, 0). (8 marks) MAS270 1 Turn Over #12;MAS270 2 (i) Find an expression

134

Separate-Local-Field NMR Spectroscopy on Half-Integer Quadrupolar Nuclei  

Science Journals Connector (OSTI)

Then, separate-local-field (SLF) MAS techniques exploiting the differential dipolar couplings which nuclei exhibit to their neighboring protons were found to be among the most practical routes to the unambiguous assignment of resonances. ... 7 We report here on the potential arising when extending such SLF measurements to solid-state quadrupolar NMR. ... Two main differences arise upon invoking SLF MAS techniques as aids in metal binding studies. ...

Julia Grinshtein; Christopher V. Grant; Lucio Frydman

2002-10-16T23:59:59.000Z

135

Facility Representative Program: Surveillance Guides  

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

Assessment Tools Assessment Tools CRADs Manager's Guide for Safety and Health Walkthroughs Surveillance Guides CMS 3.1 Configuration Management Implementation CMS 3.2 Change Control CMS 3.3 Verification of System Configuration and Operations CMS 3.4 Temporary Changes CPS 8.1 Hoisting and Rigging CPS 8.2 Trenching and Excavation EMS 21.1 Emergency Preparedness ENS 7.1 Definition of Design Requirements ERS 14.1 Satellite Accumulation Ares (RCRA Compliance) ERS 14.2 Emmissions Monitoring ERS 14.3 Underground and Above Ground Diesel Fuel Storage Tanks FPS 12.1 Life Safety FPS 12.2 Fire Protection and Prevention MAS 10.1 Maintenance Activities MAS 10.2 Control of Measuring and Test Equipment MAS 10.3 Seasonal Preparation MSS 1.1 Corrective Action/Issue Management NSS 18.1 Criticality Safety

136

Honeywell Modular Automation System Acceptance Test Procedure  

SciTech Connect (OSTI)

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.

STUBBS, A.M.

1999-09-21T23:59:59.000Z

137

Solid State Separated-Local-Field NMR Spectroscopy on Half-Integer Quadrupolar Nuclei:? Principles and Applications to Borane Analysis  

Science Journals Connector (OSTI)

The methods extend separated-local-field magic-angle spinning (SLF MAS) NMR techniques that have been used successfully in spin-1/2 spectroscopy to the study of S ? 3/2 nuclei. ... These experimental SLF schemes were also extended to 3D NMR experiments that incorporate multiple-quantum MAS, thus enabling the resolution needed to study multiple chemical sites in a solid and providing a useful tool for the assignment of inequivalent sites. ... 13-16 Among the earliest approaches proposed to monitor dipolar couplings in powdered samples subject to MAS is the separated-local-field (SLF) experiment, a 2D NMR protocol which resolves for each chemically inequivalent site S in the sample its 1H?S dipolar spinning sideband manifolds. ...

Julia Grinshtein; Lucio Frydman

2003-05-22T23:59:59.000Z

138

A Large Sample Volume Magic Angle Spinning Nuclear Magnetic Resonance Probe for In-Situ Investigations with Constant Flow of Reactants  

SciTech Connect (OSTI)

A large-sample-volume constant-flow magic angle sample spinning (CF-MAS) NMR probe is reported for in-situ studies of the reaction dynamics, stable intermediates/transition states, and mechanisms of catalytic reactions. In our approach, the reactants are introduced into the catalyst bed using a fixed tube at one end of the MAS rotor while a second fixed tube, linked to a vacuum pump, is attached at the other end of the rotor. The pressure difference between both ends of the catalyst bed inside the sample cell space forces the reactants flowing through the catalyst bed, which improves the diffusion of the reactants and products. This design allows the use of a large sample volume for enhanced sensitivity and thus permitting in-situ 13C CF-MAS studies at natural abundance. As an example of application, we show that reactants, products and reaction transition states associated with the 2-butanol dehydration reaction over a mesoporous silicalite supported heteropoly acid catalyst (HPA/meso-silicalite-1) can all be detected in a single 13C CF-MAS NMR spectrum at natural abundance. Coke products can also be detected at natural 13C abundance and under the stopped flow condition. Furthermore, 1H CF-MAS NMR is used to identify the surface functional groups of HPA/meso-silicalite-1 under the condition of in-situ drying . We also show that the reaction dynamics of 2-butanol dehydration using HPA/meso-silicalite-1 as a catalyst can be explored using 1H CF-MAS NMR.

Hu, Jian Z.; Sears, Jesse A.; Mehta, Hardeep S.; Ford, Joseph J.; Kwak, Ja Hun; Zhu, Kake; Wang, Yong; Liu, Jun; Hoyt, David W.; Peden, Charles HF

2012-02-21T23:59:59.000Z

139

Honeywell Modular Automation System Computer Software Documentation  

SciTech Connect (OSTI)

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.

STUBBS, A.M.

2000-12-04T23:59:59.000Z

140

A network based model for heterogeneous parallel computation  

E-Print Network [OSTI]

for Slave on the MasPar 63 A. C Source Code for the Slave on the nCUBE . A. D Source Code for the Server on the nCUBE 90 95 VITA 101 LIST OF FIGURES FIGURE Page 1 Two dimensional cell direction convention 2 Maspar MP-1 system block diagram 17 3... for Slave on the MasPar 63 A. C Source Code for the Slave on the nCUBE . A. D Source Code for the Server on the nCUBE 90 95 VITA 101 LIST OF FIGURES FIGURE Page 1 Two dimensional cell direction convention 2 Maspar MP-1 system block diagram 17 3...

Sathye, Adwait B.

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

POUR UNE CULTURE DES ACCIDENTS AU SERVICE DE LA SECURITE INDUSTRIELLE  

E-Print Network [OSTI]

-organisational character), locate it in the state of art with regards to accidentology, safety and risk cultures. FinallyPOUR UNE CULTURE DES ACCIDENTS AU SERVICE DE LA SECURITE INDUSTRIELLE FOR A CULTURE OF ACCIDENTS DEVOTED TO INDUSTRIAL SAFETY Nicolas DECHY Yves DIEN Michel LLORY INERIS EDF R&D IAO, Mas Saint

Paris-Sud XI, Université de

142

Zweite Satzung zur nderung der Zulassungsordnung der Universitt Stuttgart fr den Deutsch-Franzsischen Masterstudiengang Empirische Politik-und Sozialforschung  

E-Print Network [OSTI]

1 Zweite Satzung zur ?nderung der Zulassungsordnung der Universität Stuttgart für den Deutsch Zulassungsordnung für den Deutsch-Französischen Mas- terstudiengang Empirische Politik- und Sozialforschung vom 27: ,,(2) Wurden im deutsch-französischen Bachelorstudiengang oder im gleichwertigen Stu- diengang nicht

Möbius, Bernd

143

Electrical Engineering Department Los Angeles, California 90095-1594  

E-Print Network [OSTI]

plasma into a "magnetic bucket," or processing chamber covered with a permanent magnet array to provide, and a small solenoid produc- ing fields B up to 100G. QUARTZ TUBE PVC PIPE ANTENNA MAGNET WINDING 7 cm 5 cm 13 and field coil still did not produce helicon discharges. These were ICPs (Inductively Coupled Plas- mas

Chen, Francis F.

144

Multiple Drug Ingestion by Ecstasy Abusers in the United States  

Science Journals Connector (OSTI)

......1967319732 (2004). 3. R. de la Torre, M. Farr , J. Ortu o, M. Mas, R. Brenneisen, P.N...1996). 5. H. Zhao, R. Brenneisen, A. Scholer, A.J. McNally, M.A. ElSohly, T...9. G.S. Yacoubian, Jr., A.M. Arria, E......

David L. Black; Beverly Cawthon; Tim Robert; Frank Moser; Yale H. Caplan; Edward J. Cone

145

Rembrandt: Helping Personalized Medicine Become a Reality through Integrative Translational Research  

Science Journals Connector (OSTI)

...selects an invariant set with a small within-subset...consolidated into probe-set data using the Affymetrix MAS5 algorithm, with the target scaling...into gene-based probe sets. Probes mapped to alternatively...Affymetrix), which covers 116,204 single nucleotide...

Subha Madhavan; Jean-Claude Zenklusen; Yuri Kotliarov; Himanso Sahni; Howard A. Fine; and Kenneth Buetow

2009-02-01T23:59:59.000Z

146

Chemicals from Coal  

Science Journals Connector (OSTI)

...Mas-sachusetts Institute of Technology, 1974; J. B. Howard...Petras, in Coal Pro-cessing Technology (American Institute of Chem-ical...with the solidifcation of a fluid bituminous coal as it undergoes...Policy Analyst, Science and Technology Policy Office (Staff to the...

Arthur M. Squires

1976-02-20T23:59:59.000Z

147

Practical development of hybrid intelligent agent systems with SoSAA  

Science Journals Connector (OSTI)

The development of intelligent Multi Agent Systems (MAS) is a non-trivial task. While much past research has focused on high-level activities such as co-ordination and negotiation, the development of tools and strategies to address the lower-level concerns ...

Mauro Dragone; Rem W. Collier; David Lillis; Gregory M. P. O'Hare

2009-08-01T23:59:59.000Z

148

Controlled morphogenesis of amorphous silica and its relevance to biosilicification  

Science Journals Connector (OSTI)

...hydrophobic tails, are a major component of all plasma membranes (e.g., Palsdottir and Hunte...room temperature to 800 C in a flow air atmosphere. 29Si MAS NMR spectra were recorded on...III 400 (WB) spectrometer at 79.49 MHz under single pulse mode with a 7 mm zirconia...

Jia-Yuan Shi; Qi-Zhi Yao; Xi-Ming Li; Gen-Tao Zhou; Sheng-Quan Fu

149

Controlled morphogenesis of amorphous silica and its relevance to biosilicification  

Science Journals Connector (OSTI)

...to silica in areas where silica...component of all plasma membranes...in a flow air atmosphere. 29Si MAS NMR...spectrometer at 79.49 MHz under single...Specific surface areas were calculated...particles at a large scale. Table...also show a large increase at...BET surface area and pore volume...

Jia-Yuan Shi; Qi-Zhi Yao; Xi-Ming Li; Gen-Tao Zhou; Sheng-Quan Fu

150

Rduction d'ordre de modles EF pour l'Ingnierie de conception  

E-Print Network [OSTI]

.de-vuyst@ecp.fr Laboratoire MAS Ecole Centrale Paris & CMLA ENS Cachan Institut FARMAN ­ Ecole Normale Supérieure de Cachan Modélisation, simulation et validation de grands systèmes complexes Journée Farman du 8 octobre 2009 #12;2 Plan

151

Advance Registration Form  

Science Journals Connector (OSTI)

...industry-university link-ages; future trends; energy research cen-ters. Stev,en Ballard...Tho-mas Tolbert, Sheila S. Jasanioff Energy Research and Funding in the 1990s: Status...0:00pm). Fission electric power; energy efficient building; solar en-ergy...

1988-10-28T23:59:59.000Z

152

Field evaluation of cotton near-isogenic lines introgressed with QTLs for productivity and drought related traits  

E-Print Network [OSTI]

Field evaluation of cotton near-isogenic lines introgressed with QTLs for productivity and drought) between elite cultivars of the two cotton species Gossypium barbadense cv. F-177 and G. hirsutum cv. Siv, in order to (1) evaluate the potential to improve cotton drought resistance by MAS and (2) test the role

Chee, Peng W.

153

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

E-Print Network [OSTI]

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...

Protheroe, Mark Douglas

1996-01-01T23:59:59.000Z

154

The Astrophysical Journal, 781:109 (10pp), 2014 February 1 doi:10.1088/0004-637X/781/2/109 C 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.  

E-Print Network [OSTI]

Camera at the Palomar 200 inch Hale Telescope. WASP-48b and HAT-P-23b are Jupiter-mass and twice Jupiter techniques. These mas- sive gas giants, unlike anything in our solar system, are locked in scorching orbits

155

Mobile agents for e-commerce Roll No. : 99329011  

E-Print Network [OSTI]

Mobile agents for e-commerce By Rahul Jha Roll No. : 99329011 Guided By Prof. Sridhar Iyer KR years, mobile agent (MA) paradigm has received a great deal of attention. While MAs have generated the effectiveness of mobile agents versus traditional approaches. This project contributes towards

Iyer, Sridhar

156

Discordances ontologiques et questions d'interoprabilit  

E-Print Network [OSTI]

liens, et en quoi elles sont pertinentes pour les sciences sociales. Mots clés : Epistémologie, ontologie, interopérabilité, intégration de schémas, homologie structurale Summary : Beyond the search

Paris-Sud XI, Université de

157

THE ANALYSYS OF INFORMATION IMPACTS IN COORDINATING DEFENCE AGAINST MALICIOUS ATTACKS FOR INTERCONNECTED  

E-Print Network [OSTI]

and the physical behaviors of power systems. Secondly, system operators are assumed able to perform certain-ordination of Transmission of Electricity) operation handbook [6]. Meanwhile, multi-agent systems (MAS) have been widely FOR INTERCONNECTED POWER SYSTEMS Ettore Bompard George Gross Roberto Napoli Fei Xue Politecnico di Torino University

Gross, George

158

Effect of topological and phenological changes on biomass partitioning in Arabidopsis thaliana inflorescence: a preliminary model-based study  

E-Print Network [OSTI]

Effect of topological and phenological changes on biomass partitioning in Arabidopsis thaliana, France E-mail: letort@mas.ecp.fr Abstract Although the existence of phenological impact on biomass the variations of biomass allocated to fruits according to simple changes in the topological and phenological

Paris-Sud XI, Université de

159

Experimental demonstration of optical real-time data compressiona) Mohammad H. Asghari1,b)  

E-Print Network [OSTI]

conventional dispersive Fourier transform. Dispersive data compression addresses the big data problem in real below the Nyquist rate are oversampled creating a "big data" problem in real-time instruments generate mas- sive amounts of data (as high as 1 Tbit/s) creating a severe big data problem in detection

Jalali. Bahram

160

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

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Intgration oriente service des modles Grid et Multi-Agents  

E-Print Network [OSTI]

/Grid service, Service-oriented architecture, STROBE model, Software engineering, Mixed systems. JFSMA 2006 of a service-oriented approach. The concept of service is clearly at the intersection of GRID and MAS, Interaction, Grid, Intégration agent-Grid, Web/Grid service, Architecture orientée service, modèle STROBE

Paris-Sud XI, Université de

162

AGIL specifications Clement Jonquet, Pascal Dugenie and Stefano A. Cerri  

E-Print Network [OSTI]

-Agent Systems, Agent, STROBE model, Grid, Grid service, OGSA, Service Oriented Architecture, Web Service addresses this problem by means of a service-oriented approach. Services are exchanged (i.e., provided of the art about integration approaches in GRID, MAS and Service Oriented Computing (SOC). It secondly

Paris-Sud XI, Université de

163

Probabilistic Projections of 21st Climate Change over Northern Eurasia  

E-Print Network [OSTI]

Probabilistic Projections of 21st Century Climate Change over Northern Eurasia Erwan Monier, Andrei on recycled paper #12;Probabilistic Projections of 21st Century Climate Change over Northern Eurasia Erwan probabilistic projections of 21st century climate change over Northern Eurasia using the Mas- sachusetts

164

Honeywell Modular Automation System Computer Software Documentation  

SciTech Connect (OSTI)

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.

CUNNINGHAM, L.T.

1999-09-27T23:59:59.000Z

165

Rsleased upon receipt but intended f o r use  

E-Print Network [OSTI]

of those test observations toward a point southeast of Gold Peak, both men saw a flash of lightning strike the ground. almost on t h e i r l i n e of sight and about 15 miles from thorn. This flash mas followed cases of lightning from a clear $cy have been royorted. USUally, hwcvur, there is but an0 strake, rather

166

866 IEEE TRANSACTIONS ON MAGNETICS, VOL. 44, NO. 6, JUNE 2008 Dynamical Models for Eddy Current in Ferromagnetic Cores Introduced in  

E-Print Network [OSTI]

is composed of a magnet, a mas- sive circuit, a mobile vane linked to a spring, and a coil. Fig. 1 shows a current appears in the coil, the force created by the spring becomes inferior to the one created by the magnet and the coil; thus, the relay trips. A. Modeling of the Device Thanks to 3-D nonlinear FE model

Boyer, Edmond

167

Diphosphine Dioxide Cages and Hydrogen Peroxide Adducts of Phosphine Oxides: Syntheses and Applications in Surface Science  

E-Print Network [OSTI]

the P=O group for probing the surface acidity of oxides. (c) Most importantly, getting more insight regarding the nature of the P=O/surface interaction. Hereby, the mobility of the adsorbed species is of fundamental interest. In the classical 31P MAS...

Hilliard, Casie Renee

2013-12-09T23:59:59.000Z

168

Notes for Presentations on Electricity for 3rd Grade The kits provided by the state for electricity do not, at all, explain anything about the  

E-Print Network [OSTI]

does wall­plug electricity come from? Use coil moving in magnet and hand­cranked generators (pass' styrofoam popcorn, styrofoam footstool; hand­cranked electric generators; mas­ sive coil­in­magnet generatorNotes for Presentations on Electricity for 3rd Grade Ray Frey The kits provided by the state

Frey, Raymond E.

169

Controlled morphogenesis of amorphous silica and its relevance to biosilicification  

Science Journals Connector (OSTI)

...are a major component of all plasma membranes (e.g., Palsdottir...temperature to 800 C in a flow air atmosphere. 29Si MAS NMR spectra were...WB) spectrometer at 79.49 MHz under single pulse mode with...T. The spinning rate was 5 kHz and a total number of 64 scans...

Jia-Yuan Shi; Qi-Zhi Yao; Xi-Ming Li; Gen-Tao Zhou; Sheng-Quan Fu

170

Circuit Equation Formulation of Resistive Wall Mode Feedback Stabilization Schemes  

E-Print Network [OSTI]

of sustaining high­fi plas­ mas near the ideal­MHD fi­limit for times long compared to the energy con­ finement--10]. Key to the success of vertical position control is the integration of a passive stabilizing system regimes achievable, current large­scale tokamak programs are now tackling the significant challenge

171

Industrial ecology: an emerging management science.  

Science Journals Connector (OSTI)

...A 3M electronics plant in Columbia, Missouri, altered its cleaning of copper sheeting...financing mas- sive clean-coal and enhanced oil-recovery efforts. Energy efficiency...federal Department of Energy, Pacific Gas and Electric (the largest investor-owned...

B Piasecki

1992-01-01T23:59:59.000Z

172

Prediction of activating somatic mutations by identification of nonrandom mutation clusters in oncogenes and tumor suppressors  

Science Journals Connector (OSTI)

...cellular location (772 membrane and 207 cytoplasmic genes) to calculate the probability of MAS class membership using Bayesian statistics, and established that the probability was highest at or above a MEM/CYT ratio of 1.07. Applying this threshold...

Jingjing Ye; Elizabeth Lunney; Paul Rejto; Chi-Hse Teng; and Adam Pavlicek

2008-05-01T23:59:59.000Z

173

Structure and Dynamics of Cholesterol-Containing Polyunsaturated Lipid Membranes Studied by Neutron  

E-Print Network [OSTI]

Structure and Dynamics of Cholesterol-Containing Polyunsaturated Lipid Membranes Studied by Neutron by neutron diffraction, 2 H-NMR and 13 C-MAS NMR. Scattering length distribution func- tions of cholesterol Phosphatidylcholine Á Membrane Á Cholesterol Á Neutron diffraction Á NMR Introduction The lipid bilayer of cell

White, Stephen

174

Interactive local search for multiple-criteria scheduling  

E-Print Network [OSTI]

-objective scheduling (MOS). In this thesis, local search approaches based on the problem-space-based neighborhood structure are developed for both MAS and MOS. An interactive procedure is also developed to allow the decision-maker (DM) to interactively incorporate his...

Li, Shijun

2012-06-07T23:59:59.000Z

175

U.S. DEPARTMENT OF COMMERCE DANIEL C. ROPER, Secretary  

E-Print Network [OSTI]

science in the fields of biology, technology, economic and tati tic of the fi heries. They are distributed un1l supply them at adverli ed prices. Statistical Bulletins.- tati tical bulletin cover (a) tati tic tic of fishery product landed at Bo ton and Glouce ter, Mas ., Portland, Maine, and eattle, Wa h

176

Exciting News!Swansea University has successfully achieved EcoCampus Platinum. EcoCampus is a leading  

E-Print Network [OSTI]

! This is a termly newsletter from your Sustainability Team to keep you in the loop about what we do to enhance 2000l of rainwater water energy wasteCheck out the University's Carbon Management Plan and carbon emissionsfor your department! Dec.4I11pm­12.15pmIMargam318 NEED A X-MAS PRESENT? Then it's time

Harman, Neal.A.

177

Q. J. R. Meteorol. Soc. (2006), 132, pp. 30353058 doi: 10.1256/qj.06.36 Fohn/cold-pool interactions in the Rhine valley during MAP IOP 15  

E-Print Network [OSTI]

long lived in valleys and basins, where the surrounding topography reduces the advective air-mas¨ohn/cold-pool interactions in the Rhine valley during MAP IOP 15 By C. FLAMANT1, P. DROBINSKI1, M. FURGER2, B. CHIMANI3, S 2006; revised 10 July 2006) SUMMARY The f¨ohn/cold-pool interactions in the lower Alpine Rhine valley

Protat, Alain

178

Temporal Variability of the Bioaerosol Background at a Subway Station: Concentration Level, Size Distribution, and Diversity of Airborne Bacteria  

Science Journals Connector (OSTI)

...3100 high-volume electret filter sampler, in accordance with...ventilation, and air conditioning (HVAC) or passenger screening door...3100 high-volume electret filter sampler (300 lpm; Research...Andersen and MAS-100) or filters (SASS 3100) without sampling...

Marius Dybwad; Gunnar Skogan; Janet Martha Blatny

2013-10-25T23:59:59.000Z

179

Under consideration for publication in Knowledge and Information Supporting Virtual Enterprise Systems  

E-Print Network [OSTI]

intranets enable a large number of interested enterprises to access, filter, process, and present in which the MAS technol- ogy is appropriate since they include generic characteristics of complex applica Language). In our context, the characteristics of an agent that can be a workflow, person, an information

Paris-Sud XI, Université de

180

Gordon Research Conferences  

Science Journals Connector (OSTI)

...mineral deposition in New Zealand geothermal fields." 29 August. Review-discussion...Skarn ores in the Yer-rington District, Nevada"; J. T. Nash...C. Yamanka, "Anomalous heating of plas-mas by lasers...H. Ahlstrom, "Laser heating of a cold plasma in a uniform...

Alexander M. Cruickshank

1973-03-09T23:59:59.000Z

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

ANO XLIII N. 086 12/06/2013 ESTE BOLETIM DE SERVIO CONSTITUDO DE 47 (QUARENTA E SETE) PGINAS  

E-Print Network [OSTI]

trabalhos apresentando os pontos de pauta: (1) Reformulação do Núcleo Docente Estruturante - NDE; (2) Reconhecimento do curso. O NDE iniciou-se com um numero grande de professores mas com a nova normativa do NDE que: MANOELA, L?CIA, ARI, ANA PAULA, CLAUDIA MORAES e AGUINALDO. A professora MANOELA sugere organizar via NDE

Souza, Max O.

182

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

DOE Patents [OSTI]

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.

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

2014-04-08T23:59:59.000Z

183

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

E-Print Network [OSTI]

or a constraint depending on ones' point of view. Multi-agent systems (MAS) are used to explore interactions between ecological and social dynamics in complex systems by creating virtual societies sharing, novembre 2004, Montpellier, France. Cirad, Montpellier France, Colloque Interactions between water use

Boyer, Edmond

184

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

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

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 Burma Road. All insulating...

185

Tetrahedral boron in naturally occurring tourmaline  

SciTech Connect (OSTI)

Evidence for boron in both trigonal and tetrahedral coordination has been found in {sup 11}B magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectra of natural, inclusion-free specimens of aluminum-rich lithian tourmaline from granitic pregmatites.

Tagg, S.L.; Cho, H. [Pacific Northwest National Lab., Richland, WA (United States). Environmental Molecular Sciences Lab.; Dyar, M.D. [Mount Holyoke Coll., South Hadley, MA (United States). Dept. of Geology and Geography; Grew, E.S. [Univ. of Maine, Orono, ME (United States). Dept. of Geological Sciences

1999-09-01T23:59:59.000Z

186

Radiation safety assessment of a system of small reactors for distributed energy  

Science Journals Connector (OSTI)

......containment vessel is filled with seawater. Water depth of 50-100 m...as bridges or tunnels. The seawater will be taken through the pipe...pit as shown in Figure 4. Seawater in the pit is pumped out...can be stored inside the fuel storage coffin in the pit. New fuels......

N. Odano; T. Ishida

2005-12-20T23:59:59.000Z

187

A Pattern-Based Coordination and Test Framework for Multi-Agent Simulation of Production Automation Systems  

E-Print Network [OSTI]

to provide the overall system functionality like product assembly. Multi-Agent Systems (MAS) can simulate these system entities and their interactions to better understand the system behavior according to production framework allowed exploring the effects of production strategies on the system 30 times faster than

188

Normative Agents in Health Care: Uses and Challenges  

E-Print Network [OSTI]

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

Utrecht, Universiteit

189

Perspective The NEW ENGLAND JOURNAL of MEDICINE  

E-Print Network [OSTI]

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

Whitton, Mary C.

190

Astronomy & Astrophysics manuscript no. 16193paper.hyper2884 c ESO 2010 December 13, 2010  

E-Print Network [OSTI]

disc. We measured the dusty disc inner inner rim, i.e. 6 mas, constrained the inclination angle of the dense equatorial disc. Moreover, as the expansion velocity is negligible, radiatively driven wind). Fast rotation of the star leads to an expanding disc-like wind in the case of very massive stars

Boyer, Edmond

191

arXiv:astro-ph/0608427v121Aug2006 Pinwheels in the Quintuplet Cluster  

E-Print Network [OSTI]

spiral model with winding angle 110±10mas/turn and with an inclination of the rotation axis to the line which resolves this debate with the discovery of rotating spiral plumes charac- teristic of colliding-wind character- istic of colliding-wind binary "pinwheel" nebulae. These have previously been reported in dust

Monnier, John D.

192

In The Fourth International Joint Conference on Autonomous Agents and Multiagent Systems (AAMAS 05) pp. 471-477, Utrecht, The Netherlands, July 2005.  

E-Print Network [OSTI]

) pp. 471-477, Utrecht, The Netherlands, July 2005. Multiagent Traffic Management: An Improved this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers, Netherlands. Copyright 2005 ACM 1-59593-094-9/05/0007 ...$5.00. Multiagent Systems (MAS) is the subfield of AI

López-Sánchez, Maite

193

Decision Boundaries Using Bayes Factors: The Case of Cloud Masks  

E-Print Network [OSTI]

Comunicaciones, U.L.P.G.C, Campus Univ. de Tafira, 35017 Las Pal- mas de Gran Canaria, Spain, and was at Queen- ciones, U.L.P.G.C, Campus Univ. de Tafira, 35017 Las Palmas de Gran Canaria, Spain. Author

Murtagh, Fionn

194

Performance evaluation of multiagent systems: communication criterion  

Science Journals Connector (OSTI)

Many MultiAgent Systems (MAS) have been developed in various application domains such as computer networks, Internet, industrial applications, automation, process control, air traffic, robotic, simulation, etc. In spite of the rapid growth of the international ... Keywords: communication, graph theory, measurement, methodology, multiagent systems, performance evaluation

Faten Ben Hmida; Wided Lejouad Chaari; Moncef Tagina

2008-03-01T23:59:59.000Z

195

MICROPROTEOMICS: ANALYSIS OF PROTEIN DIVERSITY IN SMALL SAMPLES  

E-Print Network [OSTI]

MICROPROTEOMICS: ANALYSIS OF PROTEIN DIVERSITY IN SMALL SAMPLES Howard B. Gutstein,1 * Jeffrey S.interscience.wiley.com) DOI 10.1002/mas.20161 Proteomics, the large-scale study of protein expression in organisms, offers be expressed by the genetic material of an organism. Advancements in protein extraction, purification

196

L'Institut de Gnie Nuclaire de l'cole Polytechnique a obtenue une importante subvention de recherche, en partenariat avec l'Atomic Energy of Canada Limited  

E-Print Network [OSTI]

point de logiciels et de schémas de calcul pour le Advanced Candu Reactor (ACR), un réacteur nucléaire réacteurs CANDU actuels. La présence simultané d'eau légère et d'eau lourde crée des effects de spectres (en

Meunier, Michel

197

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

SciTech Connect (OSTI)

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.

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

198

Putting Science to Work BUILDING NANOTECHNOLOGY DEVELOPMENT  

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

BUILDING BUILDING NANOTECHNOLOGY DEVELOPMENT THOM MAsON NAMED ORNL DiRECTOR Accompanying Congressman Wamp (at lectern) during the grant announcement are, from left, Oak Ridge City Councilwoman Lou Dunlap; Tom Ballard, ORNL director of Economic Development and Partnerships; and Gerald Boyd, manager, DOE Oak Ridge Office. THOM MAsON NAMED ORNL DiRECTOR T hom Mason has been named ORNL's new direc- tor, effective July 1. The choice was announced in late May by UT-Battelle Board of Governors Chair Carl Kohrt and Vice Chair John Petersen. Mason's most recent role has been associate labora- tory director for Neutron Sciences. As head of the Spallation Neutron Source project, he led a consortium of six DOE labs in the design and construction of the $1.4 billion neutron accelerator. Completed on time,

199

Page not found | Department of Energy  

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

41 - 12850 of 28,905 results. 41 - 12850 of 28,905 results. Download Small Modular Reactors and U.S. Clean Energy Sources for Electricity For the clean energy goal to be met, then, the non-carbon emitting sources must provide some 2900 TWhr. Hydropower is generally assumed to have reached a maximum of 250 TWhr, so if we assume... http://energy.gov/ne/downloads/small-modular-reactors-and-us-clean-energy-sources-electricity Download MAS 10.1 Implementation of the Integrated Safety Management System (ISMS) Process in Maintenance Activities, 2/14/2000 The objective of this surveillance is to evaluate the effectiveness of the contractor's ISMS process with regard to maintenance activities. Surveillance activities encompass work planning and... http://energy.gov/hss/downloads/mas-101-implementation-integrated-safety-management-system-isms

200

Page not found | Department of Energy  

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

81 - 29390 of 31,917 results. 81 - 29390 of 31,917 results. Article Summary of Decisions- June 10, 2013- June 14, 2013 Decisions were issued on: - Freedom of Information Act Appeal - Personnel Security (10 CFR Part 710) http://energy.gov/oha/articles/summary-decisions-june-10-2013-june-14-2013 Download MAS 10.1 Implementation of the Integrated Safety Management System (ISMS) Process in Maintenance Activities, 2/14/2000 The objective of this surveillance is to evaluate the effectiveness of the contractor's ISMS process with regard to maintenance activities. Surveillance activities encompass work planning and... http://energy.gov/hss/downloads/mas-101-implementation-integrated-safety-management-system-isms Download OPS 9.5 Control of On-Shift Training 3/14/01 The objective of this surveillance is to verify that on-shift training is

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Page not found | Department of Energy  

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

Error message Error message The page you requested does not exist. For your convenience, a search was performed using the query Flash2009 19. You are here Home » Page not found Page not found Oops! The page you are looking for doesn't seem to be available. Did you find a broken link? Tell us and we'll fix it. Or maybe you meant to go somewhere else? Use the search box or links below to help guide you. Enter terms Flash2009 19 Search Showing 2661 - 2670 of 9,640 results. Download MAS 10.2 Control of Measuring and Test Equipment, 3/9/95 The objective of this surveillance is to verify that the contractor maintains adequate control of tools, gauges, instruments, devices or systems used to inspect, test, calibrate, measure or... http://energy.gov/hss/downloads/mas-102-control-measuring-and-test-equipment-3995

202

Faint Blue Objects in the Hubble Deep Field South Revealed: White Dwarfs, Subdwarfs, and Quasars  

E-Print Network [OSTI]

We explore the nature of the faint blue objects in the Hubble Deep Field South. We have derived proper motions for the point sources in the Hubble Deep Field South using a 3 year baseline. Combining our proper motion measurements with spectral energy distribution fitting enabled us to identify 4 quasars and 42 stars, including 3 white dwarf candidates. Two of these white dwarf candidates, HDFS 1444 and 895, are found to display significant proper motion, 21.1 $\\pm$ 7.9 mas/yr and 34.9 $\\pm$ 8.0 mas/yr, and are consistent with being thick disk or halo white dwarfs located at ~2 kpc. The other faint blue objects analyzed by Mendez & Minniti do not show any significant proper motion and are inconsistent with being halo white dwarfs; they do not contribute to the Galactic dark matter. The observed population of stars and white dwarfs is consistent with standard Galactic models.

Mukremin Kilic; R. A. Mendez; Ted von Hippel; D. E. Winget

2005-07-22T23:59:59.000Z

203

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

SciTech Connect (OSTI)

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.

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

204

Simulating the generic job shop as a multi-agent system  

Science Journals Connector (OSTI)

A model combining Discrete Event System (DES) and Multi-Agent System (MAS) is proposed to simulate a real-time job shop so that it can work as a test bed to systematically study the performance of control rules and algorithms in dynamic job shop scheduling. A definition of a generic job shop is given considering dynamic events, shop floor layout and the Material Handling System (MHS). It is first simulated as a DES and then implemented as an MAS so that data recording and analysis can be naturally distributed to the most related entities and events can be executed simultaneously at different locations. The state changes of agents and the communication among them are illustrated with state charts and sequential diagrams in Unified Modelling Language (UML). The proposed model is validated with a case study through statistical analysis and comparison with reported works.

R. Zhou; H.P. Lee; A.Y.C. Nee

2008-01-01T23:59:59.000Z

205

Honeywell modular automation system computer software documentation  

SciTech Connect (OSTI)

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.

STUBBS, A.M.

2003-07-02T23:59:59.000Z

206

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

SciTech Connect (OSTI)

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.

STUBBS, A.M.

2001-02-01T23:59:59.000Z

207

Structural analysis of lithium-excess lithium manganate cathode materials by 7Li magic-angle spinning nuclear magnetic resonance spectroscopy  

Science Journals Connector (OSTI)

The local structures of lithium-excess lithium manganese spinel oxides were studied by high-resolution solid-state 7Li magic-angle spinning (MAS) NMR spectroscopy. Two resonance lines at ?500 and ?555 ppm were observed for the spinels in 7Li MAS NMR spectra. Spinel stability tests in which spinel powder was stored in electrolyte solution were performed to analyze the changes in the lithium local structure after manganese dissolution. After the spinel stability test, the intensity of the resonance at ?500 ppm decreased, whereas new resonance line at 0 ppm was observed. The lithium content of the 0 ppm peak increases with the storage time in electrolyte. SEM and chemical analysis suggested a surface coating of non-spinel lithium compounds, the presence of defects on particles surface and fluorine incorporation into the aged spinel. In addition, about 6070% of lithium remains in the spinel framework after the storage.

Hideyuki Oka; Senshi Kasahara; Tadashi Okada; Eiichi Iwata; Masaki Okada; Takayuki Shoji; Hiroshi Ohki; Tsutomu Okuda

2001-01-01T23:59:59.000Z

208

A hybrid approach with fuzzy logic in a multi-agent system for controlling autonomous mobile robots in known environments  

Science Journals Connector (OSTI)

This paper describes the development of a multi-agent system (MAS), which is supported with fuzzy logic (to control the robot's movements in a reactive path) and vision, which helps the control of an autonomous mobile robot to exit a maze. The research consists of two stages. In the first stage the problem is to be able to make the robot exit a maze, the mobile robot is positioned at the entrance (point A) and should reach an exit (B), it should be noted that we are working with a NXT Lego MINDSTORMS robot. In its second phase the problem is to make the robot search for a recognised object, for this, a camera is used to capture images, which will be processed with vision techniques, for their identification, and after that, the MAS takes the decision to evade or take the object as considered appropriate.

Cinthya Solano-Aragon; Arnulfo Alanis; Oscar Castillo

2010-01-01T23:59:59.000Z

209

Tiragem: 18100 Pas: Portugal  

E-Print Network [OSTI]

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

Instituto de Sistemas e Robotica

210

Released on receipt but intended f o r use  

E-Print Network [OSTI]

- usually mist. rain; the r a i n t o snov. About four inches o f snow f e l l . The thermometer was in A gentle m i s t deposited moisture on every twig; the m i s t turned to the vicinity of the freezing-point t fine dust and whirl i t throu& the air, so this body of snow mas lifted. Was Impossible. To distinguish

211

cole Centrale de Nantes cole Doctorale  

E-Print Network [OSTI]

Conférences HDR, I2M-DuMAS, Arts et Métiers ParisTech Invité Daniel Berghezan Ingénieur de Recherche, Centre ailleurs à Daniel Berghezan pour m'avoir fait confiance, mais aussi pour l'ensemble de nos discussions, Violette, J-C, Anne-Sophie, pour beaucoup de choses, bien plus larges que les questions scientifiques

Paris-Sud XI, Université de

212

Minor Actinides Loading Optimization for Proliferation Resistant Fuel Design - BWR  

SciTech Connect (OSTI)

One approach to address the United States Nuclear Power (NP) 2010 program for the advanced light water reactor (LWR) (Gen-III+) intermediate-term spent fuel disposal need is to reduce spent fuel storage volume while enhancing proliferation resistance. One proposed solution includes increasing burnup of the discharged spent fuel and mixing minor actinide (MA) transuranic nuclides (237Np and 241Am) in the high burnup fuel. Thus, we can reduce the spent fuel volume while increasing the proliferation resistance by increasing the isotopic ratio of 238Pu/Pu. For future advanced nuclear systems, MAs are viewed more as a resource to be recycled, and transmuted to less hazardous and possibly more useful forms, rather than simply disposed of as a waste stream in an expensive repository facility. MAs play a much larger part in the design of advanced systems and fuel cycles, not only as additional sources of useful energy, but also as direct contributors to the reactivity control of the systems into which they are incorporated. A typical boiling water reactor (BWR) fuel unit lattice cell model with UO2 fuel pins will be used to investigate the effectiveness of adding MAs (237Np and/or 241Am) to enhance proliferation resistance and improve fuel cycle performance for the intermediate-term goal of future nuclear energy systems. However, adding MAs will increase plutonium production in the discharged spent fuel. In this work, the Monte-Carlo coupling with ORIGEN-2.2 (MCWO) method was used to optimize the MA loading in the UO2 fuel such that the discharged spent fuel demonstrates enhanced proliferation resistance, while minimizing plutonium production. The axial averaged MA transmutation characteristics at different burnup were compared and their impact on neutronics criticality and the ratio of 238Pu/Pu discussed.

G. S. Chang; Hongbin Zhang

2009-09-01T23:59:59.000Z

213

Multiagent-based adaptive pervasive service architecture (MAPS)  

Science Journals Connector (OSTI)

In this paper, we describe a multiagent-based adaptive ad-hoc pervasive service architecture. It provides dynamic context-aware service and operation management including semantic service match-making, composition, execution, monitoring, and autonomic ... Keywords: ad-hoc dynamic service composition, mixed-initiative human and machine collaborations, multi-agent systems (mas), peer-to-peer agents, self-organized agents, service-oriented architecture (soa)

Ray-Yuan Sheu; Michael Czajkowski; Martin O. Hofmann; Greg Schow

2009-07-01T23:59:59.000Z

214

Influence of thermal motion upon the lineshape in magic-angle-spinning experiments  

Science Journals Connector (OSTI)

The influence of isotropic thermal motion upon MAS NMR spectra is treated theoretically for (i) dominating inhomogeneous magnetic dipolar interaction and (ii) dominating anisotropic chemical shielding interaction. General formulas are derived which describe quantitatively the influence of thermal motion upon the shape of the central line and of the whole sideband pattern. The results of (i) are compared with those of former studies which are shown to be special cases of the general theory presented here.

D Fenzke; B.C Gerstein; H Pfeifer

1992-01-01T23:59:59.000Z

215

Discordances ontologiques et questions d'interoprabilit  

E-Print Network [OSTI]

liens, et en quoi elles sont pertinentes pour les sciences sociales. Mots clés : Epistémologie, ontologie, interopérabilité, intégration de schémas, homologie structurale Summary : Beyond the search terrain d'étude ethnologique. Après avoir quelque peu précisé ces deux questions, ainsi que les liens qu

Boyer, Edmond

216

Synthesis of poly(vinyl alcohol)-graft-poly(-caprolactone) and poly(vinyl alcohol)-graft-poly(lactide) in melt with magnesium hydride as catalyst  

E-Print Network [OSTI]

)-graft-poly(lactide) in melt with magnesium hydride as catalyst Nadia Guerrouani, André Mas* , François Schué UMR 5253 CNRS-UM2%) was investigated using MgH2 environmental catalyst and melt-grown ring opening polymerization (ROP) of -caprolactone (CL) and L- lactide (LA), that avoiding undesirable toxic catalyst and solvent. The ability of Mg

Paris-Sud XI, Université de

217

Intelligent decision support feedback using Multi-Agent System in a defence maintenance environment  

Science Journals Connector (OSTI)

Safety and Airworthiness of airborne platforms rest heavily on the maintainability and reliability to maximise the availability and reduce logistics down time. Most of the test and maintenance data currently produced is either paper-based or discarded ... Keywords: DSS, IDSS, ILS, MAS, agent-based systems, aircraft platforms, airworthiness, avionics, data mining, defence maintenance, expert systems, integrated logistics systems, intelligent agents, intelligent decision support systems, multi-agent systems, safety

Kamal Haider; Jeffrey Tweedale; Lakhmi C. Jain; Pierre J. M. Urlings

2007-01-01T23:59:59.000Z

218

BANCROFTIANA NE W S L E T T E R O F T H E FR I E N D S O F T H E BA N C R O F T LI B R A RY  

E-Print Network [OSTI]

BANCROFTIANA NE W S L E T T E R O F T H E FR I E N D S O F T H E BA N C R O F T LI B R A RY N U M B-1836. In the role of offi- cial artist, Lewis had accompanied Tho- mas L. McKenney, Superintendent of the Bureau the portraits when he returned to Detroit. Learning that McKenney planned to publish a "Portrait Gallery

California at Berkeley, University of

219

An autonomous long-term fast reactor system and the principal design limitations of the concept  

E-Print Network [OSTI]

Actinides MOX Mixed OXide MSR Molten-Salt Reactors NERI Nuclear Energy Research Initiative vii PWR Pressurized Water Reactor RGPu Reactor-Grade Plutonium SCNES Self-Consistent Nuclear Energy System STAR Secure Transportable Autonomous Reactor... of LWR?s, the drastic increase of Am and Cm inventories are observed after uranium fuel irradiation and the second recycling of MOX fuel.1 Therefore, partitioning and transmutation of the recovered MA?s could significantly reduce the long...

Tsvetkova, Galina Valeryevna

2004-09-30T23:59:59.000Z

220

O Prazer da Influncia: John Gay, Bertolt Brecht e Chico Buarque de Hollanda  

E-Print Network [OSTI]

vez um malandro . . ., e com ela eu quis acionar duas maneiras de ler a malandragem como um fenmeno cultural e literrio. Uma que se referisse ao contexto social pretrito da existncia desse "picaro" brasileiroo malandroapontando o seu declnio... modo material secundrio ou somente de reforo, mas de vital importncia para a obra porque em direo a elas gravitam os componentes mais significativos de sua tenso dramtica: comdia/tragdia, idealismo/desencanto, alienao...

Bernucci, Leopoldo M.

1994-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Cool Stars, Stellar Systems and the Sun ASP Conference Series, Vol. 154, 1998  

E-Print Network [OSTI]

, nine of which are K­type stars with lithium in excess of the zero­age­ main­sequence (ZAMS) level; i off­cloud lithium­excess stars are probably not older than IC 2602 (¸ 3 \\Theta 10 7 yr). For 18 of the lithium­excess stars south of Taurus, we have determined proper motions with a typical accuracy of 5 mas

Reffert, Sabine

222

*Corresponding author. E-mail address: lshekhtm@inp.nsk.su (L.I. Shekhtman).  

E-Print Network [OSTI]

with a maximum load capacity of 600 mAs [2] and using data from Ref. [3] to convert tube load into the dose of an object has to be reversed proportional to the size of micro-calci"cation to the power 4 (see 0168-dimensional detector is used in scan- ning mode. In this case the tube load becomes higher than in case of a true two

Kozak, Victor R.

223

Informacin durante o despus de una emergencia : Llame al nmero 459-INFO (4636)  

E-Print Network [OSTI]

Información durante o después de una emergencia : · Llame al número 459-INFO (4636) · Prenda su emergencia. · No regresar al edificio hasta que el personal de emergencia se lo indíque. Evacuación LSi usted descubre un fuego: · Evacue el área inmediatomente. · Active la alarma de fuego mas cercana. · Llame al

California at Santa Cruz, University of

224

ENERGY, CLIMATE AND SUSTAINABLE  

E-Print Network [OSTI]

ENERGY, CLIMATE AND SUSTAINABLE DEVELOPMENT NAMAs and the Carbon Market Nationally Appropriate . . . . . . . . . . . 63 ChristianEllermann, NaMas FOr disPersed eNergy eNd-Use sectOrs: Using the building sectorDenmark,theNetherlandsMinistryofForeignAffairs,nortotherespectiveorganizationsofeachindividualauthor. CapacityDevelopmentforCDM(CD4CDM)Project UNEPRisøCentre, RisøNationalLaboratoryforSustainableEnergy The

225

266 kULLE`fIN OF TBE UNITED STATES FISH COMRniIISSIGN. that off-shore wi& creates an enormous overtow j and, as it does not  

E-Print Network [OSTI]

Francisco Bulletin. Under date of March 4,1884, he says : "1 first sew French carp in the autumn of 1837-pond,in the center of *ehich was a sinall is- land surmounted bg a summer-honse, mas midway between the broad front the bridge could be seen hund- reds of French carp, which Captain Robinson,had himself brought?with great

226

Serum proteins, indirect fluorescent antibody titers and complement fixing antibody titers in dexamethasone exacerbated anaplasmosis carrier calves  

E-Print Network [OSTI]

SERUM PROTEINS, INDIRECT FLUORESCENT ANTIBODY TITERS AND COMPLEMENT FIXING ANTIBODY TITERS IN DEXAMETHASONE EXACERBATED ANAPLASMOSIS CARRIER CALVES A Thesis by Lloran Wesley Johnson Submitted to the Graduate College of Texas A%M University... in partial fulfillment of the requirement for the degree of MAS TER 0 F SC I ENC E August 1979 Major Subject: Veterinary Microbiology SERUM PROTEINS, INDIRECT FLUORESCENT ANTIBODY TITERS AND COMPLEMENT FIXING ANTIBODY TITERS IN DEXAMETHASONE EXACERBATED...

Johnson, Lloran Wesley

2012-06-07T23:59:59.000Z

227

Com criatividade e alguns conhecimentos, j possvel criar um aparelho eletrnico  

E-Print Network [OSTI]

as informações pretendidas. A primeira placa eletrónica sobre a qual se debruçaram foi o Arduino, tendo sido desenho próprio mas inspirado no Arduino, que superava os constrangimen- tos encontrados. Nascia o Bl Arduino, é o facto de poder adquirir sinais múltiplos sem grandes complicações, graças a uma eficaz

Instituto de Sistemas e Robotica

228

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

E-Print Network [OSTI]

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...

Young, Carla Jo Logan

2013-08-09T23:59:59.000Z

229

Analysis of greenhouse gases trading system using conversations among stakeholders  

Science Journals Connector (OSTI)

Greenhouse gas (GHG) reduction agreement makes up the targeted reduction of a legally binding GHG for each country or region. It enables us to buy and sell some GHG with other countries; it is the GHG trading system. But now, some free riders, ... Keywords: GHG emissions, GHG trading systems, MAS, agent-based modelling, agent-based systems, consumer behaviour, emissions reduction, free riders, genetic algorithms, global warming, greenhouse gases, multi-agent simulation, multi-agent systems

Setsuya Kurahashi; Masato Ohori

2010-08-01T23:59:59.000Z

230

The Formaldehyde Masers in NGC 7538 and G29.96-0.02: VLBA, MERLIN, and VLA Observations  

E-Print Network [OSTI]

The 6 cm formaldehyde (H2CO) maser sources in the compact HII regions NGC 7538-IRS1 and G29.96-0.02 have been imaged at high resolution (beams < 50 mas). Using the VLBA and MERLIN, we find the angular sizes of the NGC 7538 masers to be ~10 mas (30 AU) corresponding to brightness temperatures ~10^8 K. The angular sizes of the G29.96-0.02 masers are ~20 mas (130 AU) corresponding to brightness temperatures ~10^7 K. Using the VLA, we detect 2 cm formaldehyde absorption from the maser regions. We detect no emission in the 2 cm line, indicating the lack of a 2 cm maser and placing limits on the 6 cm excitation process. We find that both NGC 7538 maser components show an increase in intensity on 5-10 year timescales while the G29.96-0.02 masers show no variability over 2 years. A search for polarization provides 3-sigma upper limits of 1% circularly polarized and 10% linearly polarized emission in NGC 7538 and of 15% circularly polarized emission in G29.96-0.02. A pronounced velocity gradient of 28 km/s/arcsecon...

Hoffman, I M; Palmer, P; Richards, A M S; Hoffman, Ian M.; Palmer, Patrick

2003-01-01T23:59:59.000Z

231

NMR evidence of LiF coating rather than fluorine substitution in Li(Ni{sub 0.425}Mn{sub 0.425}Co{sub 0.15})O{sub 2}  

SciTech Connect (OSTI)

A series of 'Li{sub 1+z/2}(Ni{sub 0.425}Mn{sub 0.425}Co{sub 0.15}){sub 1-z/2}O{sub 2-z}F{sub z}' materials was prepared by a coprecipitation route and their structure was characterized using X-ray diffraction (XRD), as well as {sup 7}Li and {sup 19}F Magic Angle Spinning (MAS) NMR spectroscopy. Two hypotheses were considered: (i) formation of layered oxyfluoride materials and (ii) formation of a mixture between the layered material and LiF. Structural parameters were refined by the Rietveld method, using XRD diffraction data. The refinement results did not allow us to choose between these two hypotheses: no significant change in crystallinity and structural parameters was observed irrespective of the fluorine ratio. {sup 7}Li and {sup 19}F MAS NMR analyses showed signals with isotropic positions characteristic of LiF, but envelopes characteristic of very strong dipolar interactions with the electron spins of the material, demonstrating that LiF was not incorporated into the layered oxide structure but was instead present as a coating. - Graphical abstract: {sup 7}Li and {sup 19}F MAS NMR show signals with isotropic positions characteristic of LiF, but with spinning sidebands envelopes characteristic of very strong dipolar interactions with the electron spins of the layered oxide, demonstrating that F is not a part of the material but is present as an LiF coating.

Menetrier, M.; Bains, J. [ICMCB, CNRS, Universite Bordeaux 1, Site ENSCPB, 87 avenue Schweitzer, 33608 PESSAC cedex (France); Croguennec, L. [ICMCB, CNRS, Universite Bordeaux 1, Site ENSCPB, 87 avenue Schweitzer, 33608 PESSAC cedex (France)], E-mail: laurence.croguennec@icmcb-bordeaux.cnrs.fr; Flambard, A.; Bekaert, E. [ICMCB, CNRS, Universite Bordeaux 1, Site ENSCPB, 87 avenue Schweitzer, 33608 PESSAC cedex (France); Jordy, C.; Biensan, Ph. [SAFT, Direction de la Recherche, 111-113 Bld Alfred Daney, 33074 Bordeaux (France); Delmas, C. [ICMCB, CNRS, Universite Bordeaux 1, Site ENSCPB, 87 avenue Schweitzer, 33608 PESSAC cedex (France)

2008-12-15T23:59:59.000Z

232

Solid-state NMR examination of alteration layers on nuclear waste glasses  

Science Journals Connector (OSTI)

Abstract Solid-state nuclear magnetic resonance (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 particle sizes were corroded in ASTM type I water at 90C for periods of one and five months with a glass surface-area to solution-volume ratio of 100,000m?1. 1H29Si cross-polarization Carr-Purcell-Meiboom-Gill (CP-CPMG) magic angle spinning (MAS) NMR, 1H27Al CP-MAS NMR, 1H11B CP-MAS NMR, and 1H23Na CP-MAS NMR experiments provided 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. The mechanism of increasing coordination appears to occur through an unstable [V]Al intermediate. 1H11B CP-MAS NMR observations indicated a retention of boron in the 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 new phases are detected within the alteration layers. We identify new phases (termed as precursor phases) as crystalline sodium metasilicates. An important finding is that simple glass compositions, while providing general trends about the formation of alteration layers, do not account for all of the various reaction products that occur in the corrosion of more complex nuclear waste glass compositions.

Kelly A. Murphy; Nancy M. Washton; Joseph V. Ryan; Carlo G. Pantano; Karl T. Mueller

2013-01-01T23:59:59.000Z

233

Remarkable acceleration of the fructose dehydration over the adjacent Brnsted acid sites contained in an MFI-type zeolite channel  

Science Journals Connector (OSTI)

Abstract 5-Hydroxymethylfurfural (HMF) is an important platform chemical that can be obtained from biomass by acid catalysis. In the current investigation, an acceleration of the dehydration of fructose to HMF with an increased reaction rate and decreased activation energy is identified over the adjacent acid sites in MFI-type zeolites. The spatial proximities of these sites become prominent with the decrease of the Si/Al ratio in HZSM-5 and increase the charge density on the adsorbed reactant molecule according to 13C MAS NMR results. The cooperative catalysis by the adjacent acid sites is deduced and it is very important to develop new effective acid catalysts.

Meng Wang; Yifen Xia; Li Zhao; Chenhai Song; Luming Peng; Xuefeng Guo; Nianhua Xue; Weiping Ding

2014-01-01T23:59:59.000Z

234

A novel Artificial Neural Network training method combined with Quantum Computational Multi-Agent System theory  

Science Journals Connector (OSTI)

Artificial Neural Networks (ANNs) are powerful tools that can be used to model and investigate various complex and non-linear phenomena. In this study, we construct a new ANN, which is based on Multi-Agent System (MAS) theory and quantum computing algorithm. All nodes in this new ANN are presented as Quantum Computational (QC) agents, and these agents have learning ability. A novel ANN training method was proposed via implementing QCMAS reinforcement learning. This new ANN has powerful parallel-work ability and its training time is shorter than classic algorithm. Experiment results show that this method is effective.

Xiangping Meng; Jianzhong Wang; Yuzhen Pi; Quande Yuan

2009-01-01T23:59:59.000Z

235

Evaluation of a new method of equine thoracic radiography  

E-Print Network [OSTI]

of the horse, Application of this technology was utilized in radiography of the equine thorax. This study has developed a new method of equine thoracic radio- graphy, air-gap radiography. The method utilizes a medium output x-ray unit and rare... utilizing medium output x-ray equipment needed to be developed. A method of equine thoracic radiography, air-gap radiography, was devised utilizing a medium output [35 milliampere-seconds (mAs), 100 kilovoltage-peak (kpp)] x-ray unit combined with rare...

King, Glen Keith

2012-06-07T23:59:59.000Z

236

URAT: astrometric requirements and design history  

E-Print Network [OSTI]

The U.S. Naval Observatory Robotic Astrometric Telescope (URAT) project aims at a highly accurate (5 mas), ground-based, all-sky survey. Requirements are presented for the optics and telescope for this 0.85 m aperture, 4.5 degree diameter field-of-view, specialized instrument, which are close to the capability of the industry. The history of the design process is presented as well as astrometric performance evaluations of the toleranced, optical design, with expected wavefront errors included.

Zacharias, N; Rakich, A; Epps, H

2006-01-01T23:59:59.000Z

237

Nature and the patterns for giving in the poetry of Claudio Rodriguez  

E-Print Network [OSTI]

Dia de sol" (of Conjuros) the sun awakens the poet for the third time, this time to go to his home- land. It reappears in "A mi ropa tendida (el alma). " appears in Alianza condena in the poems: "Bruj as al mediodta (Hacia el conocimiento), " "Mala..., but unaware of itself as obj ect; "La encina, que conserva mas un rayo / de sol que todo un mes de primavera, / no siente lo espon- taneo de su sombra, / la sencillez del crecimiento; apenas / si conoce el terreno en que ha brotado, " (p. 45) The poet...

Demel, Marjorie Jean

1979-01-01T23:59:59.000Z

238

Estimation of Nitric and Nitrous Nitrogen in Soils  

E-Print Network [OSTI]

, were found to check as well as could be expected with the zinc ferrous-sulphate methods, which include both nitrate and nitrite nitrogen. Some of the results obtained in the course of the investigation out- lined are here presented, together with a... in Series 1 mas 1.0 part per million on 7.7 parts per million, or about 12 per cect: the average difference of the 11 was 0.1 on 7.5 parts per million, or a little over one per cent. In Series 2, the maximum clifference was 3.3 parts per million on 25...

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

1931-01-01T23:59:59.000Z

239

Ferromagnetic transition temperature enhancement in (Ga,Mn)As semiconductors by carbon codoping  

E-Print Network [OSTI]

by a recent experimental observation of a marked enhancement of the Curie temperature in Mn-implanted GaAs:C samples compared to the Mn-implanted undoped GaAs layers.11 We focus on two key issues related to high-density carbon dop- ing. ~i.... Jungwirth,1,2 J. Mas?ek,3 Jairo 1Institute of Physics ASCR, Cukrovarnick 2University of Texas at Austin, Physics Department, 1 U 3Institute of Physics ASCR, Na Slovanc 4Department of Physics, Texas A&M Universit ~Received 23 June 2003; revised...

Jungwirth, T.; Masek, J.; Sinova, Jairo; MacDonald, AH.

2003-01-01T23:59:59.000Z

240

Plan of organization  

E-Print Network [OSTI]

~!lr fund available. By recent enactment the appropriation ib placed at the disposal of tEe screral States, and the station1 are being organized. OBJECT OF THE STATIONS. The purpose for which the Agricultural Experiment 11 mas passed is clearly... in the mails free. THE EXPERIMENT STATIONS were placed under the supervision of the Boards of Directors of the Agricultural and Mechanical Colleges, not for the pur- pose of assisting the colleges, but because it was thought the fund would be most...

McInnis, Louis L. (Louis Lowry); Scott, T. M.; Gulley, F. A. (Frank Arthur)

1888-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

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

SciTech Connect (OSTI)

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.

STUBBS, A.M.

2001-06-25T23:59:59.000Z

242

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

E-Print Network [OSTI]

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..., and the present reviewer. I am writing these words on April 17, the date on which Tho- mas Vaughan?s wife, Rebecca, died: ?My most deare wife sickened on Friday in the Evening, being the 16 of April, and dyed the Saturday following in the Evening, being the 17...

Alan Rudrum

2003-01-01T23:59:59.000Z

243

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

E-Print Network [OSTI]

, 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...

Oshiro, Irene Sueko

2012-06-07T23:59:59.000Z

244

Use and workload factors in dental radiation-protection design  

SciTech Connect (OSTI)

A dosimetric and photographic record of the pattern of radiation on the walls of a dental x-ray operatory was obtained. This indicates that there is an overlap of the radiation fields with ''hot spots'' on the side wall opposite the patient's head, with the rest of the room receiving minimal exposures. In the course of this investigation, it was found that use of the long-cone x-ray machine resulted in less radiation reaching the walls of the room. The presently accepted concept of mAs per week proves to be less relevant than the number of films being taken.

Reid, J.A.; MacDonald, J.C.

1984-02-01T23:59:59.000Z

245

Coelho Neto: Introduction of African Culture into Brazilian Drama  

E-Print Network [OSTI]

. Aquela que ali est por exemplo, parece vestir uma grande dama. Ah! que elas no desdenham Pai Ambrsio, isso no. J aqui encontrei a baronesa do Furo e a mulher do banqueiro Simas. Aquela que ali est cheira-me a 60 LATIN AMERICAN THEATRE REVIEW... no Corpo: Clementina ( Baslia)A senhora vem por molstia? Baslia (respirando)Infelizmente! O fgado de minha filha tem cres cido tanto que ela j no pode apertar o colete. ClementinaEla casada? BasliaSolteira. ClementinaMas ser mesmo o...

Pierson, Colin M.

1976-04-01T23:59:59.000Z

246

Packing a Safe School Lunch (Spanish)  

E-Print Network [OSTI]

reproducir suficiente bacteria en dos horas para causar enfemedad. Algunos alimentos deben mantenerse fr?os (a 40 gra- dos F o menos) o calientes (a 140 grados F o mas). Estos son alimentos perecederos tales como carne, aves, mariscos, huevos y productos l...?cteos (incluyen- do el yogurt). Lo m?s importante para preparar una comida sana, es mantener fr?os los alimentos fr?os y caliente los alimentos calientes y mantener todo limpio. A continuaci?n, el por qu? y el c?mo. Para reproducirse, las bacterias que causan...

Van Laanen, Peggy

2001-10-22T23:59:59.000Z

247

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)

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.

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

248

Abundance and distribution of the western Gulf stone crab (Menippe adina) in Galveston Bay, Texas  

E-Print Network [OSTI]

I BUNDANCE AND DI STRISUT . ON OF THE WESTERN GULF STOiuE CRAB LilFNIL'PC l', Diijil) IN GALVESTON BAY TEXAS Thesis JALXE iiURRAY HOSLET SuL&mitted to th= Office of Graduate Studies of Texa Aai1 University in :. a- Dial fulfullment... of the requirements for the deqree of MAS'I ~ R OI" SCIENCE May 19B9 Major subject: Wildlife and Fisheries Sciences ABUNDANCE AND DISTRIBUTION OF THE WESTERN GULF STONE CRAB (NENIPPE ADINA) IN GALVESTON BAY, TEXAS A Thesis by JANE MURRAY BOSLET Approved...

Boslet, Jane Murray

2012-06-07T23:59:59.000Z

249

Development of Analytical Methods for the Determination of Methylarginines in Serum  

E-Print Network [OSTI]

cationic amino acid transporters, and thus all impact the amount of NO that is produced [23]. As a result, research has been performed to elucidate the role of these compounds in various pathologies where NO bioavailability is believed to play a... and can then exit the cell via cationic amino acid transporters and enter systemic circulation [23]. Serum arginine concentrations are 30-100 ?M while MA concentrations are typically 100-800 nM. Despite the relatively low amounts of MAs compared...

Linz, Thomas

2013-05-31T23:59:59.000Z

250

The vascular flora of Robertson County, Texas  

E-Print Network [OSTI]

-ME VASCULAR 'LORA OF ROSERTSON CONNTY, T~S A Thesis by TMOMAS ZVNN STARSNCM Subm t-ed to the 9"aduar. e College of Texas AaM gn' ve. -sity ir. pa=t al u' f' ' ' . . er. e of rhe regu':emen =- for the deg=ee of MAS FR OF SCIENCE May l984 Ma...:or Subgect: 3ctany THE VASCULAR FLORA OF ROBERTSON COUNTY, TEXAS A Thesis THOMAS JUNN STARBUCX Approved as to style and content by: ugh D. Wzl on red E. Smemns (member) tephan L. Hatch (member) Merrmll H. Sweet (member) Walter M. Kemp (Head...

Starbuck, Thomas Junn

2012-06-07T23:59:59.000Z

251

A Situao Social da Mulher no Teatro de Consuelo de Castro e Leilah Assuno  

E-Print Network [OSTI]

SPRING 1976 13 A Situao Social de Mulher no Teatro de Consuelo de Castro e Leilah Assuno ALCIDES JOO DE BARROS A presena feminina em palcos brasileiros um acontecimento normal e at mesmo exigido pelo pblico j bastante acostumado a..., pois o fato em si nada significa do ponto de vista artstico. Na verdade, suas peas por si mesmas justificam um estudo que as coloque numa posio de relevncia, como se faria com qualquer autor de mrito. Mas o que realmente se faz digno de nota ...

Barros, Alcides J. de.

1976-04-01T23:59:59.000Z

252

A survey of Meloidogyne spp. parasitizing peaches in Texas and their effects on four peach rootstocks  

E-Print Network [OSTI]

. ~taco nit ~tco nit nd M. ~a*nt were observed in the same field 1n the West Cross Timbers area, but were widely separated by soil topography. The s e co dltlons w e pr sent ir e sr Te s where M. ~lnao nits ~co ~t nd N. ~fnco nlr rite wer ohs r ed ln... nits ~tco nits th n Nema- guard. Elberta was lower than the other three rootstocks tested. Thus, based on gall development alone, Okinawa and g-37 rootstocl pp ar to h n resistant t M. ~ino nit ~taco nits th Elberta o N aguard. Thi. s mas determined...

Johnson, Jerral D

2012-06-07T23:59:59.000Z

253

Structure and formation mechanism of six-fold coordinated silicon in phosphosilicate glasses  

SciTech Connect (OSTI)

The local structure of sixfold oxygen coordinated silicon ({sup [6]}Si) in sodium phosphosilicate glasses has been investigated using MAS NMR spectroscopy and ab initio quantum-chemical techniques. It has been demonstrated that {sup [6]}Si is interconnected by six PO{sub 4} tetrahedral units by sharing only their corners, forming a nearly regular [SiO{sub 6/2}]{sup 2-} octahedral site. Alkali cations behave as charge compensators of the doubly charged {sup [6]}Si species and hence play an indispensable role in stabilizing the peculiar octahedral coordination in the glasses.

Miyabe, D.; Yoko, T. [Amorphous Materials Laboratory, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan); Takahashi, M.; Tokuda, Y. [Amorphous Materials Laboratory, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011 (Japan); PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012 (Japan); Uchino, T. [Department of Chemistry, Faculty of Science, Kobe University, Nada, Kobe 657-8501 (Japan)

2005-05-01T23:59:59.000Z

254

Presencia de Walt Whitman en la poesia de Pablo Neruda: la relacion entre Hojas de Hierba y Canto General  

E-Print Network [OSTI]

ese caracter se expresa a traves de la poesia de Whitman. Una vez mas se aproxima a la poesia de Whitman con una perspectiva hemisferica, pero no hace ninguna mencion de la teoria de Bolton ni del estudio de Alegria, que fue publicado en Mexico en..., sonaba con realizar una sociedad igualitaria en la cual todos los ciudadanos contaran con libre acceso al mercado y al sistema politico; sin embargo, corno la critica observa, el sueno se volvio pesadilla con la corrupcion politica y economica del...

Rios, David Joel

1999-01-01T23:59:59.000Z

255

Social Thought and Research, Volume 23, Number 1&2 (2000): Front Matter  

E-Print Network [OSTI]

to the above address. TABLE OF CONTENTS Vol. 23, No. 1&2 2000 ACKNOWLEDGMENTS FEATURE ARTICLE ON AMERICAN SOCIAL THOUGHT Robert J. Kent Dewey and the Project of Critical Social Theory ~ 1 Two EARLY AMERICAN MAsTERS: MEAD AND BLUMER George Herbert Mead Science... Vision in Sociology 199 Clifford L. Staples and William G. Staples Rereading Harry Braverman's LaborandMonopolY Capital After Twenty years 227 Jean Van Delinder Dance as Experience: Pragmatism and Classical Ballet 239 1 ~ I r I I ; J I . I ! SPECIAL...

2000-04-01T23:59:59.000Z

256

Recovery of minor actinides from spent fuel using TPEN-immobilized gels  

SciTech Connect (OSTI)

A series of separation experiments was performed in order to study the recovery process for minor actinides (MAs), such as americium (Am) and curium (Cm), from the actual spent fuel by using an extraction chromatographic technique. N,N,N',N'-tetrakis-(4-propenyloxy-2-pyridylmethyl) ethylenediamine (TPPEN) is an N,N,N',N'-tetrakis (2-pyridylmethyl) ethylenediamine (TPEN) analogue consisting of an incorporated pyridine ring that acts as not only a ligand but also as a site for polymerization and crosslinking of the gel. The TPPEN and N-isopropylacrylamide (NIPA) were dissolved into dimethylformamide (DMF, Wako Co., Ltd.) and a silica beads polymer, and then TTPEN was immobilized chemically in a polymer gel (so called TPEN-gel). Mixed oxide (MOX) fuel, which was highly irradiated up to 119 GWD/MTM in the experimental fast reactor Joyo, was used as a reference spent fuel. First, uranium (U) and plutonium (Pu) were separated from the irradiated fuel using an ion-exchange method, and then, the platinum group elements were removed by CMPO to leave a mixed solution of MAs and lanthanides. The 3 mol% TPPEN-gel was packed with as an extraction column (CV: 1 ml) and then rinsed by 0.1 M NaNO{sub 3}(pH 4.0) for pH adjustment. After washing the column by 0.01 M NaNO{sub 3} (pH 4.0), Eu was detected and the recovery rate reached 93%. The MAs were then recovered by changing the eluent to 0.01 M NaNO{sub 3} (pH 2.0), and the recovery rate of Am was 48 %. The 10 mol% TPPEN-gel was used to improve adsorption coefficient of Am and a condition of eluent temperature was changed in order to confirm the temperature swing effect on TPEN-gel for MA. More than 90% Eu was detected in the eluent after washing with 0.01 M NaNO{sub 3} (pH 3.5) at 5 Celsius degrees. Americium was backwardly detected and eluted continuously during the same condition. After removal of Eu, the eluent temperature was changed to 32 Celsius degrees, then Am was detected (pH 3.0). Finally remained Am could be stripped from TPPEN-gel by changing the pH of the eluent to 2.0. These results These results prove that the proposed recovery process for MAs is a potential candidate for future reprocessing methods based on the extraction chromatographic technique. (authors)

Koyama, S.; Suto, M.; Ohbayashi, H. [Oarai Research and Development Center, Japan Atomic Energy Agency, Oarai (Japan); Oaki, H. [Solutions Research Organization, Tokyo Institute of Technology, Tokyo (Japan); Takeshita, K. [Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo (Japan)

2013-07-01T23:59:59.000Z

257

Roberto Cossa habla del teatro  

E-Print Network [OSTI]

no vas a ver las puestas de tus piezas, pero vas al teatro a ver piezas que no son tuyas? S, voy al teatro bastante. Hay algn dramaturgo que te guste ms que otro, alguna predileccin? S, hay. Yo tengo una predileccin especial, quizs por... referentes son bien otra cosa. Es esto algo consciente por parte tuya o sali nada mas? No, uno est consciente sobre el lenguaje. Mi intento en su momento fue trabajar con todas mis imgenes de la Argentina de hoy, visto el mundo intelectual, el mundo...

Magnarelli, Sharon

1987-04-01T23:59:59.000Z

258

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]

oficiales que con- currieron a la expedicion que por ser las distancias 15 tan grandes y la conducion por medio de costosos correos ha sido indispensable alguna demora. Y hallandose ya todas en mi poder, lo executo omitien- do embiar los diarios y...- nocimiento y ganar tiempo para que bolviendose los soldados a sus casas, se les hiziessen mas ligeras las pencions de la campa?a, respecto de asestir a ella qua- 15 si generalmente a su costa. 2 ? El dia siete de henero, acompa?ado de el m r...

Cunningham, Debbie S.

2011-10-21T23:59:59.000Z

259

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

E-Print Network [OSTI]

Limited (AECL), portant sur la mise au point de logiciels et de schémas de calcul pour le Advanced Candu des ACR est différente de celle des réacteurs CANDU actuels. La présence simultanée d'eau légère et d des réacteurs CANDU actuels devra être modifiée et améliorée avant de s'adapter au ACR. Nous devrons

Meunier, Michel

260

Wanzek Construction | Open Energy Information  

Open Energy Info (EERE)

Wanzek Construction Wanzek Construction Jump to: navigation, search Logo: Wanzek Construction Name Wanzek Construction Address 2028 2nd Avenue NW Place West Fargo, ND Zip 58078 Country United States Sector Geothermal energy, Renewable Energy, Solar, Wind energy Product Turnkey Construction Services Stock Symbol MTZ Year founded 1971 Number of employees 1100 Company Type For Profit Company Ownership Public Small Business No Minority Business Yes Affiliated Companies MasTec N.A; MasTec Renewables; Phone number 2816064172 Website http://www.wanzek.com Coordinates 29.78577°, -95.66735° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":29.78577,"lon":-95.66735,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

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261

M.A. Silva Dias,  

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

1 a 260. 1 a 260. 1 Modelando o Impacto Climático Regional e Remoto do Desmatamento M.A. Silva Dias, 1 R. Avissar, 2 e P. Silva Dias 1,3 As observações e os modelos concordam que os níveis atuais e os padrões de desmatamento da Amazônia de fato intensificam as transferências de massa e energia entre a terra e a atmosfera por meio da criação de circulações impulsionadas termicamente com efeitos significativos sobre a precipitação, mas que variam sazonal e regionalmente. Isso também indicou a necessidade de identificar o limiar onde o aumento do desmatamento realmente implica a diminuição de pluviosidade, conforme apontado pela maioria dos modelos de circulação geral de baixa resolução. Grande parte dos estudos sobre o impacto remoto ainda é exploratória, mas indicam que

262

Regeneração de Floresta Secundária Eric A. Davidson Woods Hole Research Center, Falmouth, Massachusetts, USA  

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

299 a 309. 299 a 309. 1 Limitações de Nutrientes para a Regeneração de Floresta Secundária Eric A. Davidson Woods Hole Research Center, Falmouth, Massachusetts, USA Luiz A. Martinelli CENA, Universidade de São Paulo, Piracicaba, Brasil Os solos antigos, altamente intemperizados, de florestas de planície na Bacia Amazônica em geral mostram ciclos conservativos de P e ciclos "frouxos" de N. Essa generalização se aplica às florestas maduras, mas a aceleração da mudança no uso da terra está alterando as paisagens da Amazônia. Aproximadamente 16% da área original de floresta foram desmatados e cerca de 160.000 km 2 são cobertos por vegetação secundária. As florestas secundárias são comuns nas regiões agrícolas, mas poucas permanecem por muito mais de

263

Retrieval of Aerosol Optical Depth in Vicinity of Broken Clouds from Reflectance Ratios: Case Study  

SciTech Connect (OSTI)

A recently developed reflectance ratio (RR) method for the retrieval of aerosol optical depth (AOD) is evaluated using extensive airborne and ground-based data sets collected during the Cloud and Land Surface Interaction Campaign (CLASIC) and the Cumulus Humilis Aerosol Processing Study (CHAPS), which took place in June 2007 over the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Southern Great Plains site. A detailed case study is performed for a field of single-layer shallow cumuli observed on June 12, 2007. The RR method is applied to retrieve the spectral values of AOD from the reflectance ratios measured by the MODIS Airborne Simulator (MAS) for two pairs of wavelengths (660 and 470 nm and 870 and 470 nm) collected at a spatial resolution of 0.05 km. The retrieval is compared with an independent AOD estimate from three ground-based Multi-filter Rotating Shadowband Radiometers (MFRSRs). The interpolation algorithm that is used to project MFRSR point measurements onto the aircraft flight tracks is tested using AOD derived from NASA Langley High Spectral Resolution Lidar (HSRL). The RR AOD estimates are in a good agreement (within 5%) with the MFRSR-derived AOD values for the 660-nm wavelength. The AODs obtained from MAS reflectance ratios overestimate those derived from MFRSR measurements by 15-30% for the 470-nm wavelength and underestimate the 870-nm AOD by the same amount.

Kassianov, Evgueni I.; Ovchinnikov, Mikhail; Berg, Larry K.; McFarlane, Sally A.; Flynn, Connor J.; Ferrare, Richard; Hostetler, Chris A.; Alexandrov, Mikhail

2010-10-06T23:59:59.000Z

264

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

E-Print Network [OSTI]

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...

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

2015-01-01T23:59:59.000Z

265

A PARALLAX DISTANCE AND MASS ESTIMATE FOR THE TRANSITIONAL MILLISECOND PULSAR SYSTEM J1023+0038  

SciTech Connect (OSTI)

The recently discovered transitional millisecond pulsar system J1023+0038 exposes a crucial evolutionary phase of recycled neutron stars for multiwavelength study. The system, comprising the neutron star itself, its stellar companion, and the surrounding medium, is visible across the electromagnetic spectrum from the radio to X-ray/gamma-ray regimes and offers insight into the recycling phase of millisecond pulsar evolution. Here, we report on multiple-epoch astrometric observations with the Very Long Baseline Array (VLBA) which give a system parallax of 0.731 {+-} 0.022 milliarcseconds (mas) and a proper motion of 17.98 {+-} 0.05 mas yr{sup -1}. By combining our results with previous optical observations, we are able to use the parallax distance of 1368{sup +42}{sub -{sub 39}} pc to estimate the mass of the pulsar to be 1.71 {+-} 0.16 M{sub Sun }, and we are also able to measure the three-dimensional space velocity of the system to be 126 {+-} 5 km s{sup -1}. Despite the precise nature of the VLBA measurements, the remaining {approx}3% distance uncertainty dominates the 0.16 M{sub Sun} error on our mass estimate.

Deller, A. T. [Netherlands Institute for Radio Astronomy (ASTRON), 7990-AA Dwingeloo (Netherlands); Archibald, A. M.; Kaspi, V. M. [Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8 (Canada); Brisken, W. F. [National Radio Astronomy Observatory, Socorro, NM 87801 (United States); Chatterjee, S. [Astronomy Department, Cornell University, Ithaca, NY 14853 (United States); Janssen, G. H.; Lyne, A. G.; Stappers, B. [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom); Lorimer, D.; McLaughlin, M. A. [Department of Physics, West Virginia University, Morgantown, WV 26506 (United States); Ransom, S. [National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States); Stairs, I. H. [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 (Canada)

2012-09-10T23:59:59.000Z

266

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

SciTech Connect (OSTI)

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.

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

267

THE CATALOG OF POSITIONS OF OPTICALLY BRIGHT EXTRAGALACTIC RADIO SOURCES OBRS-2  

SciTech Connect (OSTI)

Future space-borne astrometry missions, such as Gaia, will be able to determine the optical positions of hundreds of quasars with submilliarcsecond accuracies comparable to those achieved in radio by very long baseline interferometry (VLBI). Comparisons of coordinate systems from space-borne missions and VLBI will be very important, first for investigations of possible systematic errors and second for investigations of possible shifts between centroids of radio and optical emissions in active galactic nuclei. In order to make such a comparison more robust, a program for densification of the grid of radio sources detectable with both VLBI and Gaia was launched in 2006. Program sources are 398 quasars with declinations > - 10 Degree-Sign that are brighter than 18 mag at the V band. The first two observing campaigns were run in 2007-2008. In the third campaign, a set of 291 objects from that list was observed with the VLBA+EVN in 2010-2011 with the primary goal of producing their images with milliarcsecond resolution. In this paper, following the method of absolute astrometry, coordinates of observed sources have been derived with milliarcsecond accuracies from analysis of these observations. The catalog of positions of 295 target sources, estimates of their correlated flux densities at 2.2 and 8.4 GHz, and their images are presented. The accuracies of source coordinates are in a range of 2-200 mas, with a median of 3.2 mas.

Petrov, L., E-mail: Leonid.Petrov@lpetrov.net [Astrogeo Center, Falls Church, VA 22043 (United States)

2013-07-01T23:59:59.000Z

268

First-light LBT nulling interferometric observations: warm exozodiacal dust resolved within a few AU of eta Corvi  

E-Print Network [OSTI]

We report on the first nulling interferometric observations with the Large Binocular Telescope Interferometer (LBTI), resolving the N' band (9.81 - 12.41 um) emission around the nearby main-sequence star eta Crv (F2V, 1-2 Gyr). The measured source null depth amounts to 4.40% +/- 0.35% over a field-of-view of 140 mas in radius (~2.6\\,AU at the distance of eta Corvi) and shows no significant variation over 35{\\deg} of sky rotation. This relatively low null is unexpected given the total disk to star flux ratio measured by Spitzer/IRS (~23% across the N' band), suggesting that a significant fraction of the dust lies within the central nulled response of the LBTI (79 mas or 1.4 AU). Modeling of the warm disk shows that it cannot resemble a scaled version of the Solar zodiacal cloud, unless it is almost perpendicular to the outer disk imaged by Herschel. It is more likely that the inner and outer disks are coplanar and the warm dust is located at a distance of 0.5-1.0 AU, significantly closer than previously predic...

Defrre, D; Skemer, A J; Kennedy, G M; Bailey, V P; Hoffmann, W F; Mennesson, B; Millan-Gabet, R; Danchi, W C; Absil, O; Arbo, P; Beichman, C; Brusa, G; Bryden, G; Downey, E C; Durney, O; Esposito, S; Gaspar, A; Grenz, P; Haniff, C; Hill, J M; Lebreton, J; Leisenring, J M; Males, J R; Marion, L; McMahon, T J; Montoya, M; Morzinski, K M; Pinna, E; Puglisi, A; Rieke, G; Roberge, A; Serabyn, E; Sosa, R; Stapeldfeldt, K; Su, K; Vaitheeswaran, V; Vaz, A; Weinberger, A J; Wyatt, M C

2015-01-01T23:59:59.000Z

269

The EBR-II X501 Minor Actinide Burning Experiment  

SciTech Connect (OSTI)

The X501 experiment was conducted in EBR-II as part of the IFR (Integral Fast Reactor) program to demonstrate minor actinide burning through the use of a homogeneous recycle scheme. The X501 subassembly contained two metallic fuel elements loaded with relatively small quantities of americium and neptunium. Interest in the behavior of minor actinides (MA) during fuel irradiation has prompted further examination of existing X501 data, and generation of new data where needed in support of the U.S. waste transmutation effort. The X501 experiment is one of the few minor actinide-bearing fuel irradiation tests conducted worldwide and knowledge can be gained by understanding the changes in fuel behavior due to addition of MAs. Of primary interest are the affect of the MAs on fuel-cladding-chemical-interaction, and the redistribution behavior of americium. The quantity of helium gas release from the fuel and any effects of helium on fuel performance are also of interest. It must be stressed that information presented at this time is based on the limited PIE conducted in 1995-1996, and currently represents a set of observations rather than a complete understanding of fuel behavior. This paper provides a summary of the X501 fabrication, characterization, irradiation, and post irradiation examination.

M. K. Meyer; S. L. Hayes; W. J. Carmack; H. Tsai

2009-07-01T23:59:59.000Z

270

The EBR-II X501 Minor Actinide Burning Experiment  

SciTech Connect (OSTI)

The X501 experiment was conducted in EBR-II as part of the IFR (Integral Fast Reactor) program to demonstrate minor actinide burning through the use of a homogeneous recycle scheme. The X501 subassembly contained two metallic fuel elements loaded with relatively small quantities of americium and neptunium. Interest in the behavior of minor actinides (MA) during fuel irradiation has prompted further examination of existing X501 data, and generation of new data where needed in support of the U.S. waste transmutation effort. The X501 experiment is one of the few minor actinide-bearing fuel irradiation tests conducted worldwide and knowledge can be gained by understanding the changes in fuel behavior due to addition of MAs. Of primary interest are the affect of the MAs on fuel-cladding-chemical-interaction, and the redistribution behavior of americium. The quantity of helium gas release from the fuel and any effects of helium on fuel performance are also of interest. It must be stressed that information presented at this time is based on the limited PIE conducted in 1995-1996, and currently represents a set of observations rather than a complete understanding of fuel behavior.

Jon Carmack; S. L. Hayes; M. K. Meyer; H. Tsai

2008-06-01T23:59:59.000Z

271

Influence of the 11year solar cycle on annual streamflow maxima in Southern Canada  

Science Journals Connector (OSTI)

Summary The re-occurrence pattern of major extremes in hydrology, such as the timing and intensity of river floods, is related to a variety of natural and anthropogenic factors. In this study, the particular temporal regional influence of ?11year solar radiation cyclicities on the maximum annual streamflow (MAS) records from six stations from four eco-zones in Southern Canada were investigated. Wavelet analysis decomposition and re-composition techniques were applied to extract the ?11year signals in the hydrological records. An ?11year cyclicity is evident in all eco-zones but it is superimposed by non-periodic variability in the 2 to 18year wavebands that are due to El Nino/Southern Oscillation and North Atlantic Oscillation related precipitation variability or random components in the records. The ?11year MAS cyclicity is strong in the Mountain ecozone (Rocky Mountains) and less strong in the Boreal Shield. In these eco-zones, it was found that years that experienced major floods were most likely to occur during low sunspot number years, in the spring time approximately 67years after the last solar maximum. The results of the wavelet analysis demonstrate that major floods are more likely to occur during sunspot cycles with relatively low sunspot numbers after the last maximum.

Andreas Prokoph; Jan Adamowski; Kaz Adamowski

2012-01-01T23:59:59.000Z

272

Indirectly detected chemical shift correlation NMR spectroscopy in solids under fast magic angle spinning  

SciTech Connect (OSTI)

The development of fast magic angle spinning (MAS) opened up an opportunity for the indirect detection of insensitive low-{gamma} nuclei (e.g., {sup 13}C and {sup 15}N) via the sensitive high-{gamma} nuclei (e.g., {sup 1}H and {sup 19}F) in solid-state NMR, with advanced sensitivity and resolution. In this thesis, new methodology utilizing fast MAS is presented, including through-bond indirectly detected heteronuclear correlation (HETCOR) spectroscopy, which is assisted by multiple RF pulse sequences for {sup 1}H-{sup 1}H homonuclear decoupling. Also presented is a simple new strategy for optimization of {sup 1}H-{sup 1}H homonuclear decoupling. As applications, various classes of materials, such as catalytic nanoscale materials, biomolecules, and organic complexes, are studied by combining indirect detection and other one-dimensional (1D) and two-dimensional (2D) NMR techniques. Indirectly detected through-bond HETCOR spectroscopy utilizing refocused INEPT (INEPTR) mixing was developed under fast MAS (Chapter 2). The time performance of this approach in {sup 1}H detected 2D {sup 1}H{l_brace}{sup 13}C{r_brace} spectra was significantly improved, by a factor of almost 10, compared to the traditional {sup 13}C detected experiments, as demonstrated by measuring naturally abundant organic-inorganic mesoporous hybrid materials. The through-bond scheme was demonstrated as a new analytical tool, which provides complementary structural information in solid-state systems in addition to through-space correlation. To further benefit the sensitivity of the INEPT transfer in rigid solids, the combined rotation and multiple-pulse spectroscopy (CRAMPS) was implemented for homonuclear {sup 1}H decoupling under fast MAS (Chapter 3). Several decoupling schemes (PMLG5{sub m}{sup {bar x}}, PMLG5{sub mm}{sup {bar x}x} and SAM3) were analyzed to maximize the performance of through-bond transfer based on decoupling efficiency as well as scaling factors. Indirect detection with assistance of PMLG{sub m}{sup {bar x}} during INEPTR transfer proved to offer the highest sensitivity gains of 3-10. In addition, the CRAMPS sequence was applied under fast MAS to increase the {sup 1}H resolution during t{sub 1} evolution in the traditional, {sup 13}C detected HETCOR scheme. Two naturally abundant solids, tripeptide N-formyl-L-methionyl-L-leucyl-L-phenylalanine (f-MLF-OH) and brown coal, with well ordered and highly disordered structures, respectively, are studied to confirm the capabilities of these techniques. Concomitantly, a simple optimization of {sup 1}H homonuclear dipolar decoupling at MAS rates exceeding 10 kHz was developed (Chapter 4). The fine-tuned decoupling efficiency can be obtained by minimizing the signal loss due to transverse relaxation in a simple spin-echo experiment, using directly the sample of interest. The excellent agreement between observed decoupling pattern and earlier theoretical predictions confirmed the utility of this strategy. The properties of naturally abundant surface-bound fluorocarbon groups in mesoporous silica nanoparticles (MSNs) were investigated by the above-mentioned multidimensional solid-state NMR experiments and theoretical modeling (Chapter 5). Two conformations of (pentafluorophenyl)propyl groups (abbreviated as PFP) were determined as PFP-prone and PFP-upright, whose aromatic rings are located above the siloxane bridges and in roughly upright position, respectively. Several 1D and 2D NMR techniques were implemented in the characterizations, including indirectly detected {sup 1}H{l_brace}{sup 13}C{r_brace} and {sup 19}F{l_brace}{sup 13}C{r_brace} 2D HETCOR, Carr-Purcell-Meiboom-Gill (CPMG) assisted {sup 29}Si direct polarization and {sup 29}Si{sup 19}F 2D experiments, 2D double-quantum (DQ) {sup 19}F MAS NMR spectra and spin-echo measurements. Furthermore, conformational details of two types of PFP were confirmed by theoretical calculation, operated by Dr. Takeshi Kobayashi. Finally, the arrangement of two surfactants, cetyltrimetylammoium bromide (CTAB) and cetylpyridinium bromide (CPB), mixed inside th

Mao, Kanmi

2011-08-15T23:59:59.000Z

273

Publications  

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

9 results: 9 results: BibTex RIS RTF XML Sort by: Author Title Type [ Year (Desc) ] Filters: Author is Guoying Chen [Clear All Filters] 2011 Chen, Guoying, Alpesh K. Shukla, Xiangyun Song, and Thomas J. Richardson. "Improved Kinetics and Stabilities in Mg-Sybstained Li-MnPO4." J. of Materials Chemistry 21 (2011): 10126. 2010 Chen, Guoying, and Thomas J. Richardson. "Continuity and Performance in Composite Electrodes." Journal of Power Sources 195 (2010): 5387. Cabana, Jordi, Junichi Shirakawa, Guoying Chen, Thomas J. Richardson, and Clare P. Grey. "MAS NMR Study of the Metastable Solid Solution Found in the LiFePO4/FePO4 Sustem." Chemistry of Materials 22 (2010): 1249. Chen, Guoying, and Thomas J. Richardson. "Overcharge Protection for 4 V

274

User:Graham7781 | Open Energy Information  

Open Energy Info (EERE)

User page User page Edit with form History Facebook icon Twitter icon » User:Graham7781 Jump to: navigation, search Brazil Name Graham Hill Location Denver, Colorado Edits 7932 Friends User Edits GregZiebold 3711 JZ 42 Jorn.Aabakken 5 Rmckeel 1772 Woodjr 59997 Twong 24774 Dbrodt 21 I am a Research Analyst at the National Renewable Energy Laboratory, and a recent graduate of the University of Denver in MAS Environmental Policy and Management. I've been working extensively at NREL on expanding Openei.org by adding contributions, editing and patrolling pages, and developing training tutorial videos to guide users on how to use the wiki. I also have led the creation of the Renewable Energy News Gateway and the Oil and Gas gateway. I've collaborated with Jarett Zuboy (User:JZ) on helping build the external

275

M.Batistella,  

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

55 a 563. 55 a 563. 1 Resultados do LBA e uma Perspectiva da Futura Pesquisa Amazônica M.Batistella, 1 P. Artaxo, 2 C. Nobre, 3 M. Bustamante, 4 e F. Luizão 5 Este capítulo resume resultados selecionados do Experimento de Grande Escala da Biosfera-Atmosfera na Amazônia (LBA) e descreve, brevemente, uma visão da pesquisa futura amazônica. Enfatiza-se a necessidade de pesquisa sobre as interações sociedade e meio ambiente no contexto de mudança regional e global. O LBA desenvolveu capacidade científica e institucional na Amazônia, mas seu desempenho para promover o desenvolvimento sustentável foi restrito porque o programa focalizou, em sua grande parte, o avanço do conhecimento básico, com menos ênfase nos estudos integrados, especificamente

276

Page not found | Department of Energy  

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

61 - 18570 of 31,917 results. 61 - 18570 of 31,917 results. Download Visualization & Controls Program Peer Review http://energy.gov/oe/downloads/visualization-controls-program-peer-review Download Independent Oversight Assessment, Idaho Cleanup Project Sodium Bearing Waste Treatment Project- November 2012 Assessment of Nuclear Safety Culture at the Idaho Cleanup Project Sodium Bearing Waste Treatment Project http://energy.gov/hss/downloads/independent-oversight-assessment-idaho-cleanup-project-sodium-bearing-waste-treatment Download MAS 10.2 Control of Measuring and Test Equipment, 3/9/95 The objective of this surveillance is to verify that the contractor maintains adequate control of tools, gauges, instruments, devices or systems used to inspect, test, calibrate, measure or...

277

Page not found | Department of Energy  

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

71 - 25180 of 28,560 results. 71 - 25180 of 28,560 results. Download CMS 3.3 Verification of System Configuration and Operations, 3/27/95 The objective of this surveillance is for the Facility Representative to verify that the facility's configuration and operations are consistent with facility design basis documentation. These... http://energy.gov/hss/downloads/cms-33-verification-system-configuration-and-operations-32795 Download ENS 7.1 Definition of Design Requirements, 3/30/95 The objective of this surveillance is to evaluate the effectiveness of the contractor's program to establish comprehensive design requirements for modifications or new installations before detailed... http://energy.gov/hss/downloads/ens-71-definition-design-requirements-33095 Download MAS 10.2 Control of Measuring and Test Equipment, 3/9/95

278

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

SciTech Connect (OSTI)

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.

Greenspan, Ehud; Todreas, Neil; Taiwo, Temitope

2009-03-10T23:59:59.000Z

279

The Use of Conversation in the English Novel  

E-Print Network [OSTI]

Libraries Center for Digital Scholarship. http://kuscholarworks.ku.edu Submitted to the Department of English of the University of Kansas in partial fulfillment of the requirements for the Degree of Master of Arts Mas te r T h e s i s E n g l i s h S c... h a f e r , F e r t h a 1896 Use o f c o n v e r s a t i o n i n the E n g l i s h n o v e l * THE USE OF CONVERSATION IN THE ENGLISH NOVELL C h a p t e r I ft - x f r J J O , t h e p o o r I n d i a n o f the newspaper j o k e s , w h o i...

Schafer, Bertha B.

1896-01-01T23:59:59.000Z

280

Characterization of Tricoordinate Boron Chemical Shift Tensors:? Definitive High-Field Solid-State NMR Evidence for Anisotropic Boron Shielding  

Science Journals Connector (OSTI)

Boron-11 NMR spectroscopy of MAS and stationary solid powdered samples of crystalline trimesitylborane (BMes3, Mes = 2,4,6-trimethylphenyl) and triphenyl borate (B(OPh)3) has been carried out at applied magnetic field strengths of 17.63 and 9.4 T. From these experiments, both the boron chemical shift tensors and the nuclear quadrupolar coupling parameters have been determined. ... Analysis of 11B NMR spectra of stationary powdered trimesitylborane at 17.63 T (Figure 2) and 9.4 T (not shown) allows for the determination of the principal components of the boron chemical shift tensor (?11 = ?22 = 117.7 ppm, ?33 = ?3.3 ... Both boron nuclear isotopes, 10B and 11B, have magnetic moments and elec. ...

David L. Bryce; Roderick E. Wasylishen; Myrlene Gee

2001-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "mas mas mas" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

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

SciTech Connect (OSTI)

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.

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

2011-11-04T23:59:59.000Z

282

THE SOLAR NEIGHBORHOOD. XXIII. CCD PHOTOMETRIC DISTANCE ESTIMATES OF SCR TARGETS-77 M DWARF SYSTEMS WITHIN 25 pc  

SciTech Connect (OSTI)

We present CCD photometric distance estimates of 100 SCR (SuperCOSMOS RECONS) systems with {mu} {>=} 0.''18 yr{sup -1}, 29 of which are new discoveries previously unpublished in this series of papers. These distances are estimated using a combination of new VRI photometry acquired at CTIO and JHK magnitudes extracted from 2MASS. The estimates are improvements over those determined using photographic plate BRI magnitudes from SuperCOSMOS plus JHK, as presented in the original discovery papers. In total, 77 of the 100 systems investigated are predicted to be within 25 pc. If all 77 systems are confirmed to have {pi}{sub trig} {>=} 40 mas, this sample would represent a 23% increase in M dwarf systems nearer than 25 pc in the southern sky.

Winters, Jennifer G.; Henry, Todd J.; Jao, Wei-Chun [Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 (United States); Subasavage, John P. [Cerro Tololo Inter-American Observatory, Casilla 603, La Serena (Chile); Finch, Charlie T. [United States Naval Observatory, Washington, DC 20392-5420 (United States); Hambly, Nigel C., E-mail: winters@chara.gsu.edu, E-mail: thenry@chara.gsu.edu, E-mail: jao@chara.gsu.edu, E-mail: jsubasavage@ctio.noao.edu, E-mail: finch@usno.navy.mil, E-mail: nch@roe.ac.uk [Scottish Universities Physics Alliance (SUPA), Institute of Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom)

2011-01-15T23:59:59.000Z

283

The Solar Neighbourhood XI: The trigonometric parallax of SCR 1845--6357  

E-Print Network [OSTI]

We present a trigonometric parallax for the nearby star SCR1845--6357, an extremely red high proper motion object discovered by Hambly et al. (2004) and identified via accurate photoelectric photometry and spectroscopy to be an M8.5 dwarf with a photometric parallax of $4.6\\pm0.8$ pc by Henry et al. (2004). Using methods similar to those described in Deacon & Hambly (2001) we have derived a full astrometric solution from SuperCOSMOS scans of eight survey and non--survey Schmidt photographs held in the United Kingdom Schmidt Telescope Unit plate library. We calculate the trigonometric parallax to be $\\pi=282\\pm23$ mas yielding a distance of $3.5\\pm0.3$ pc which implies an absolute K$_{s}$ magnitude of 10.79. This distance calculation places SCR1845--6357 as the 16th closest stellar system to the Sun.

Niall R. Deacon; Nigel C. Hambly; Todd J. Henry; John P. Subasavage; Misty A. Brown; Wei-Chun Jao

2004-09-24T23:59:59.000Z

284

Proper Motion Objects in the Hubble Deep Field  

E-Print Network [OSTI]

Using the deepest and finest resolution images of the Universe acquired with the Hubble Space Telescope and a similar image taken 7 years later for the Great Observatories Origins Deep Survey, we have derived proper motions for the point sources in the Hubble Deep Field--North. Two faint blue objects,HDF2234 and HDF3072, are found to display significant proper motion, 10.0 $\\pm$ 2.5 and 15.5 $\\pm$ 3.8 mas yr$^{-1}$. Photometric distances and tangential velocities for these stars are consistent with disk white dwarfs located at $\\sim$ 500 pc. The faint blue objects analyzed by Ibata et al. (1999) and Mendez & Minniti (2000) do not show any significant proper motion; they are not halo white dwarfs and they do not contribute to the Galactic dark matter. These objects are likely to be distant AGN.

M. Kilic; Ted von Hippel; R. A. Mendez; D. E. Winget

2004-03-26T23:59:59.000Z

285

High-Resolution Solid-State Nuclear Magnetic Resonance Experiments on Highly Radioactive Ceramics  

SciTech Connect (OSTI)

A triple containment magic-angle spinning rotor insert system has been developed and a sample handling procedure formulated for safety analyzing highly radioactive solids by high resolution solid state NMR. The protocol and containment system have been demonstrated for magic angle spinning (MAS) experiments on ceramic samples containing 5-10 wt% 239Pu and 238Pu at rotation speeds of 3500 Hz. The technique has been used to demonstrate that MASNMR experiments can be used to measure amorphous atomic number fractions produced during accelerated internal radioactive decay. This will allow incorporated ?-emitters with short half-lives to be used to model the long-term radiation tolerance of potential ceramic radioactive waste forms. It is believed to be the first example of MASNMR spectroscopy on samples containing fissionable isotopes.

Farnan, Ian E.; Cho, Herman M.; Weber, William J.; Scheele, Randall D.; Johnson, Nigel R.; Kozelisky, Anne E.

2004-12-01T23:59:59.000Z

286

Aging Studies of Filled and Unfilled VCE  

SciTech Connect (OSTI)

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).

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

2009-11-10T23:59:59.000Z

287

Multi-agent system for the operation of an integrated microgrid  

Science Journals Connector (OSTI)

Operation of modern power system has become a complex problem as its focus has shifted to implementing smart grid techniques and integrating distributed renewable energy sources. Integrated microgrid is an innovative control and management architecture at distribution network level where several microgrids are electrically interconnected with each other. This paper presents a multi-agent system (MAS) for the operation of an integrated microgrid. A hierarchical control scheme is used for maximizing the power production output of local distributed generators and optimizing power exchanges among the microgrids as well as power exchange between the main distribution system and the integrated microgrid. This scheme was implemented on the multi-agent system. Simulation studies carried out on the developed system demonstrate the effectiveness of the proposed multi-agent system for the operation of an integrated microgrid.

Thillainathan Logenthiran; Dipti Srinivasan

2012-01-01T23:59:59.000Z

288

Local Structure of Phosphate/Amine Polyion Complexes in Phospholipid/Polypeptide Mixtures by Solid State NMR and ab Initio Chemical Shielding Calculation  

Science Journals Connector (OSTI)

The complete information about the 31P chemical shift tensor (CST), principal values of CST and the mutual orientation of CST with respect to a molecular fixed frame, for methylguanidinium dihydrogenorthophosphate (MGD/H2PO4), which is thought of as a model compound for DPPA/pARG, was determined by both cross-polarization and magic-angle sample spinning (CPMAS) and spin?echo separated local field (SLF) measurements under the magic-angle sample spinning (MAS). ... Pulse sequences for 31P?1H heteronuclear correlation (HETCOR) NMR (a) and spin?echo separated local field (SLF) measurements (b) in the solid state. ... 31P Separated Local Field (SLF) Measurements. ...

Naoki Asakawa; Daisuke Sato; Minoru Sakurai; Yoshio Inoue

2000-03-08T23:59:59.000Z

289

A Dickensian Christmas  

E-Print Network [OSTI]

;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1; 5 #1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1;#1; BENE DICTUM: A DICKENSIAN CHRISTMAS by M. FAE GLASGOW SHOPPING DAYS or DOYLE THE COPPER FELT UP balloons, red... Christmas A Dicken- sian Christmas A Dickensian Christ- mas A Dickensian #1; #1; #1; #1; #1;#1; #1; #1; #1; #1; #1; #1; #1; #1; #1;#1; BENE DICTUM #1; A DICKENSIAN CHRISTMAS by M. FAE GLASGOW #1; BENE DICTUM #1; A DICKENSIAN CHRISTMAS by M...

Glasgow, M.F.

1992-01-01T23:59:59.000Z

290

Expansion Parallax for the Compact Planetary Nebula M2-43  

E-Print Network [OSTI]

We present high quality radio continuum observations made with the Very Large Array (VLA) at 3.6 cm at two epochs toward the planetary nebula M2-43. The comparison of the two epochs, obtained with a time separation of 4.07 years, clearly shows the expansion of the planetary nebula with an angular rate of 0.61 +/- 0.09 mas/year.Assuming that the expansion velocity in the plane of the sky (determined from these measurements) and the expansion velocity in the line of sight (determined from optical spectroscopy available in the literature) are equal, we find a distance to the planetary nebula of 6.9 +/- 1.5 kpc. This is the largest distance for a planetary nebula measured up to now with this technique.

L. Guzman; Y. Gomez; L. F. Rodriguez

2006-02-19T23:59:59.000Z

291

Equilibrium relations in the system TiO{sub 2}/V{sub 2}O{sub 5}/P{sub 2}O{sub 5} and crystal structure of a NASICON-related vanadyl(V) titanium(IV) phosphate  

SciTech Connect (OSTI)

Vanadyl(V)-titanium-orthophosphate (V{sup V}O)Ti{sup IV}{sub 6}(PO{sub 4}){sub 9} is formed by solid state reactions in the temperature range 525{<=}{theta}{<=}780 Degree-Sign C. At higher temperature decomposition into V{sub 2}O{sub 5} and the hitherto unknown solid solution Ti(P{sub 1-x}V{sub x}){sub 2}O{sub 7} (0{<=}x{<=}0.23; 0.30{<=}x{<=}0.43) is observed. The process of phase formation has been monitored by MAS-NMR ({sup 31}P, {sup 51}V) spectroscopy. Equilibrium phase relations in the quaternary system TiO{sub 2}/VO{sub 2.5}/PO{sub 2.5} have been determined. A structure analysis from X-ray single-crystal data (P6{sub 3}/m (No. 176), Z=2; a=8.4438(3) A, c=22.215(1) A, 14 independent atoms, 87 variables, 2066 unique reflections, R1=0.032, wR2=0.084) shows the relationship of (V{sup V}O)Ti{sup IV}{sub 6}(PO{sub 4}){sub 9} to the NASICON structure family. In marked contrast to the other members of this family [Ti{sup IV}{sub 2}O{sub 9}] double-octahedra and strongly distorted tetrahedral [(V{sup V}=O)O{sub 3}] groups are observed besides isolated [Ti{sup IV}O{sub 6}] octahedra and phosphate tetrahedra. The structure model is in agreement with the results from MAS-NMR ({sup 31}P, {sup 51}V) spectroscopy. - Graphical abstract: (V{sup V}O)Ti{sup IV}{sub 6}(PO{sub 4}){sub 9} belongs to the NASICON structure family. Its structure contains [Ti{sup IV}{sub 2}O{sub 9}] double-octahedra and unprecedented, strongly distorted tetrahedral [(V{sup V}=O)O{sub 3}] groups, in stark contrast to other members of this family. The structure model is in agreement with the results from MAS-NMR ({sup 31}P, {sup 51}V) spectroscopy. Highlights: Black-Right-Pointing-Pointer Equilibrium relations for the subsolidus have been established for the system TiO{sub 2}/V{sub 2}O{sub 5}/P{sub 2}O{sub 5}. Black-Right-Pointing-Pointer Phase formation has been monitored by XRPD as well as by {sup 31}P- and {sup 51}-MAS-NMR. Black-Right-Pointing-Pointer A solid solution Ti(P{sub 1-x}V{sub x}){sub 2}O{sub 7} exists up to x=0.43 with a miscibility gap at 0.23{<=}x{<=}0.30. Black-Right-Pointing-Pointer The crystal structure of the new NASICON-related phosphate (V{sup V}O)Ti{sup IV}{sub 6}(PO{sub 4}){sub 9} is reported. Black-Right-Pointing-Pointer The crystal structure contains the unprecedented [(V=O)O{sub 3}] group.

Titlbach, Sven; Hoffbauer, Wilfried [Institut fuer Anorganische Chemie der Universitaet Bonn, Gerhard-Domagk-Str. 1, D-53121 Bonn (Germany)] [Institut fuer Anorganische Chemie der Universitaet Bonn, Gerhard-Domagk-Str. 1, D-53121 Bonn (Germany); Glaum, Robert, E-mail: rglaum@uni-bonn.de [Institut fuer Anorganische Chemie der Universitaet Bonn, Gerhard-Domagk-Str. 1, D-53121 Bonn (Germany)] [Institut fuer Anorganische Chemie der Universitaet Bonn, Gerhard-Domagk-Str. 1, D-53121 Bonn (Germany)

2012-12-15T23:59:59.000Z

292

Systematic errors in the measurement of neutrino masses due to baryonic feedback processes: Prospects for stage IV lensing surveys  

E-Print Network [OSTI]

We examine the importance of baryonic feedback effects on the matter power spectrum on small scales, and the implications for the precise measurement of neutrino masses through gravitational weak lensing. Planned large galaxy surveys such as the Large Synoptic Sky Telescope (LSST) and Euclid are expected to measure the sum of neutrino masses to extremely high precision, sufficient to detect non-zero neutrino masses even in the minimal mass normal hierarchy. We show that weak lensing of galaxies while being a very good probe of neutrino masses, is extremely sensitive to baryonic feedback processes. We use publicly available results from the Overwhelmingly Large Simulations (OWLS) project to investigate the effects of active galactic nuclei feedback, the nature of the stellar initial mass function, and gas cooling rates, on the measured weak lensing shear power spectrum. Using the Fisher matrix formalism and priors from CMB+BAO data, we show that when one does not account for feedback, the measured neutrino mas...

Natarajan, Aravind; Battaglia, Nicholas; Trac, Hy

2014-01-01T23:59:59.000Z

293

Implementing the National Broadband  

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

MEEKER COOPERATIVE LIGHT AND POWER-MINNESOTA MEEKER COOPERATIVE LIGHT AND POWER-MINNESOTA I. Introduction a. Identification/description of your company. Meeker Cooperative Light and Power (MCLP) is a non-profit electric cooperative serving 9120 consumers and is located in central Minnesota. The cooperative serves an area of approximately 1410 square miles. The geography varies from flat to moderate rolling hills with many lakes and wooded areas. For the most part the area is relatively sparsely populated. The average consumer density is less than five consumers per mile. All power purchases are from our cooperative power suppliers of Basin Electric Power COOP and Great River Energy (GRE). Overview of communications networks 1. 220 MHz radio point to point 2. 900 MHz MAS radio

294

DISCOVERY OF THE Y1 DWARF WISE J064723.23623235.5  

SciTech Connect (OSTI)

We present the discovery of a very cold, very low mass, nearby brown dwarf using data from the NASA Wide-field Infrared Survey Explorer (WISE). The object, WISE J064723.23623235.5, has a very red WISE color of W1W2 > 3.77 mag and a very red Spitzer Space Telescope color of ch1ch2 = 2.82 0.09 mag. In J{sub MKO} ch2 color (7.58 0.27 mag) it is one of the two or three reddest brown dwarfs known. Our grism spectrum from the Hubble Space Telescope (HST) confirms it to be the seventeenth Y dwarf discovered, and its spectral type of Y1 0.5 makes it one of the four latest-type Y dwarfs classified. Astrometric imaging from Spitzer and HST, combined with data from WISE, provides a preliminary parallax of ? = 115 12 mas (d = 8.7 0.9 pc) and proper motion of ? = 387 25 mas yr{sup 1} based on 2.5 yr of monitoring. The spectrum implies a blue JH color, for which model atmosphere calculations suggest a relatively low surface gravity. The best fit to these models indicates an effective temperature of 350-400 K and a mass of ?5-30 M{sub Jup}. Kinematic analysis hints that this object may belong to the Columba moving group, which would support an age of ?30 Myr and thus an even lower mass of <2 M{sub Jup}, but verification would require a radial velocity measurement not currently possible for a J = 22.7 mag brown dwarf.

Kirkpatrick, J. Davy; Gelino, Christopher R.; Beichman, Charles A.; Mace, Gregory N. [Infrared Processing and Analysis Center, MS 100-22, California Institute of Technology, Pasadena, CA 91125 (United States); Cushing, Michael C.; Schneider, Adam [Department of Physics and Astronomy, MS 111, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606-3328 (United States); Tinney, C. G. [School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia); Faherty, Jacqueline K., E-mail: davy@ipac.caltech.edu [Department of Astronomy, University of Chile, Camino El Observatorio 1515, Casilla 36-D Santiago (Chile)

2013-10-20T23:59:59.000Z

295

VLBI FOR GRAVITY PROBE B. II. MONITORING OF THE STRUCTURE OF THE REFERENCE SOURCES 3C 454.3, B2250+194, AND B2252+172  

SciTech Connect (OSTI)

We used 8.4 GHz very long baseline interferometry images obtained at up to 35 epochs between 1997 and 2005 to examine the radio structures of the main reference source, 3C 454.3, and two secondary reference sources, B2250+194 and B2252+172, for the guide star for the NASA/Stanford relativity mission Gravity Probe B (GP-B). For one epoch in 2004 May, we also obtained images at 5.0 and 15.4 GHz. The 35 8.4 GHz images for quasar 3C 454.3 confirm a complex, evolving, core-jet structure. We identified at each epoch a component, C1, near the easternmost edge of the core region. Simulations of the core region showed that C1 is located, on average, 0.18 {+-} 0.06 mas west of the unresolved 'core' identified in 43 GHz images. We also identified in 3C 454.3 at 8.4 GHz several additional components that moved away from C1 with proper motions ranging in magnitude between 0.9 c and 5 c. The detailed motions of the components exhibit two distinct bends in the jet axis located {approx}3 and {approx}5.5 mas west of C1. The spectra between 5.0 and 15.4 GHz for the 'moving' components are steeper than those for C1. The 8.4 GHz images of B2250+194 and B2252+172, in contrast to those of 3C 454.3, reveal compact structures. The spectrum between 5.0 and 15.4 GHz for B2250+194 is inverted while that for B2252+172 is flat. Based on its position near the easternmost edge of the 8.4 GHz radio structure, close spatial association with the 43 GHz core, and relatively flat spectrum, we believe 3C 454.3 component C1 to be the best choice for the ultimate reference point for the GP-B guide star. The compact structures and inverted-to-flat spectra of B2250+194 and B2252+172 make these objects valuable secondary reference sources.

Ransom, R. R.; Bartel, N.; Bietenholz, M. F.; Luca, P. [Department of Physics and Astronomy, York University, 4700 Keele Street, Toronto, ON, M3J 1P3 (Canada); Lebach, D. E.; Ratner, M. I.; Shapiro, I. I. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Lederman, J. I. [Centre for Research in Earth and Space Sciences, York University, 4700 Keele Street, Toronto, ON M3J 1P3 (Canada)

2012-07-01T23:59:59.000Z

296

periodicrpp.dvi  

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

0 0 by D.E. Groom (LBNL), and E. Bergren. Atomic weights of stable elements are adapted from the Commission on Isotopic Abundances and Atomic Weights, "Atomic Weights of the Elements 2007," http://www.chem.qmul.ac.uk/iupac/AtWt/. The atomic number (top left) is the number of protons in the nucleus. The atomic mass (bottom) of a stable elements is weighted by isotopic abundances in the Earth's surface. If the element has no stable isotope, the atomic mass (in parentheses) of the most stable isotope currently known is given. In this case the mass is from http://www.nndc.bnl.gov/amdc/masstables/Ame2003/mass.mas03 and the longest-lived isotope is from www.nndc.bnl.gov/ensdf/za form.jsp. The exceptions are Th, Pa, and U, which do have characteristic terrestrial compositions. Atomic masses are relative to the mass of 12 C, defined to be exactly 12 unified atomic mass

297

regionalmaps  

Gasoline and Diesel Fuel Update (EIA)

Specific LNG Terminals Specific LNG Terminals Generic LNG Terminals Pacifi c (9) Moun tain (8) CA (12) AZ/N M (11) W. North Centr al (4) W. South Centr al (7) E. South Centr al (6) E. North Centr al (3) S. Atlan tic (5) FL (10) Mid. Atlan tic (2) New Engl. (1) W. Cana da E. Cana da MacK enzie Alask a Cana da Offsh ore and LNG Mexic o Baha mas Primary Flows Secondary Flows Pipeline Border Crossing Specific LNG Terminals Generic LNG Terminals Figure 6. Coal Supply Regions Source: Energy Information Administration. Office of Integrated Analysis and Forecasting WA ID OR CA NV UT TX OK AR MO LA MS AL GA FL TN SC NC KY VA WV WY CO SD ND MI MN WI IL IN OH MD PA NJ DE CT MA NH VT NY ME RI MT NE IA KS MI AZ NM 500 0 SCALE IN MILES APPALACHIA Northern Appalachia Central Appalachia Southern Appalachia INTERIOR NORTHERN GREAT PLAINS Eastern Interior Western Interior Gulf Lignite Dakota Lignite Western Montana

298

Oliver L. Phillips,  

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

73 a 387. 73 a 387. 1 Mudanças na Biomassa, Dinâmica e Composição da Floresta Amazônica, 1980 - 2002 Oliver L. Phillips, 1 Niro Higuchi, 2 Simone Vieira, 3 Timothy R. Baker, 1 Kuo-Jung Chao, 1 e Simon L. Lewis 1 O monitoramento de longo prazo de parcelas florestais distribuídas ao longo da Amazônia fornece uma poderosa forma de se quantificar os estoques e fluxos de biomassa e biodiversidade. Neste capítulo, examinamos as evidências de mudanças associadas à estrutura, dinâmica e composição funcional de florestas amazônicas maduras nas últimas décadas. As florestas maduras têm, como um todo, adquirido biomassa e apresentado dinâmica e crescimento acelerados, mas as questões sobre a persistência dessas mudanças de longo prazo permanecem. Em razão de o crescimento

299

Susan Trumbore Department of Earth System Science, University of California, Irvine, California, USA  

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

51 a 462 51 a 462 1 Dinâmica do Carbono do Solo Susan Trumbore Department of Earth System Science, University of California, Irvine, California, USA Plínio Barbosa de Camargo Laboratório de Ecologia Isotópica do CENA/USP, Piracicaba, Brasil A quantidade de carbono orgânico (C) estocada na camada superior de 1m de solos minerais na Bacia Amazônica (~40 Pg C) representa 3% do estoque global estimado de carbono no solo. Acrescentando-se os estoques detríticos de C da superfície e carbono do solo a mais de um metro de profundidade, essa estimativa pode se quadriplicar. O potencial de resposta do carbono do solo da Amazônia às mudanças no uso da terra, clima ou composição atmosférica depende da forma e da dinâmica do carbono do solo. 30% de 10 cm do topo, mas >85% em

300

Carlos A. Nobre e José A. Marengo Centro de Ciência do Sistema Terrestre, Instituto Nacional de Pesquisas Espaciais  

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

5 a 147. 5 a 147. 1 Entendendo o Clima da Amazônia: Avanço do LBA Carlos A. Nobre e José A. Marengo Centro de Ciência do Sistema Terrestre, Instituto Nacional de Pesquisas Espaciais São José dos Campos, Brasil Paulo Artaxo Instituto de Física, Universidade de São Paulo, São Paulo, Brasil A Amazônia desempenha um papel importante no funcionamento do clima da Terra. Ela atua como uma das fontes indispensáveis de calor para a atmosfera global por meio da evaporação do vapor d'água na superfície e liberação de calor na média e alta troposfera pelo calor latente de condensação em nuvens convectivas tropicais. A evaporação ao longo do ano é de aproximadamente 3 a 3,5 mm d -1 . Mas, em regiões de savana na fronteira com a floresta amazônica, a evaporação

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301

regionalmaps  

Gasoline and Diesel Fuel Update (EIA)

LNG Imports LNG Imports Pacifi c (9) Moun tain (8) CA (12) AZ/N M (11) W. North Centr al (4) W. South Centr al (7) E. South Centr al (6) E. North Centr al (3) S. Atlan tic (5) FL (10) Mid. Atlan tic (2) New Engl. (1) W. Cana da E. Cana da MacK enzie Alask a Cana da Offsh ore and LNG Mexic o Baha mas Primary Flows Secondary Flows Pipeline Border Crossing Figure 6. Coal Supply Regions Source: Energy Information Administration. Office of Integrated Analysis and Forecasting WA ID OR CA NV UT TX OK AR MO LA MS AL GA FL TN SC NC KY VA WV WY CO SD ND MI MN WI IL IN OH MD PA NJ DE CT MA NH VT NY ME RI MT NE IA KS MI AZ NM 500 0 SCALE IN MILES APPALACHIA Northern Appalachia Central Appalachia Southern Appalachia INTERIOR NORTHERN GREAT PLAINS Eastern Interior Western Interior Gulf Lignite Dakota Lignite Western Montana Wyoming, Northern Powder River Basin Wyoming, Southern Powder River Basin Western Wyoming

302

Composting of the solid fraction of digestate derived from pig slurry: Biological processes and compost properties  

Science Journals Connector (OSTI)

Abstract The aim of this paper was to assess the characteristics of the solid fractions (SF) obtained by mechanical separation of digestate, their compostability and compost quality. To do so, the SF of digestates obtained from anaerobic digestion of pig slurry, energy crops and agro-industrial residues were sampled in five plants located in Northern Italy. Results obtained indicated that anaerobic digestion by itself promoted the high biological stability of biomasses with a Potential Dynamic Respiration Index (PDRI) close to 1000mgO2kgVS?1h?1. Subsequent composting of digestates, with an added bulking agent, did not give remarkably different results, and led only to a slight modification of the characteristics of the initial non-composted mixtures; the composts obtained fully respected the legal limits for high quality compost. Chemical studies of organic matter composition of the biomasses by using CP MAS 13C NMR, indicated that the compost was composed of a high relative content of O-alkyl-C (71.47% of total C) (cellulose and hemicelluloses) and a low alkyl-C (12.42%) (i.e. volatile fatty acids, steroid-like molecules, aliphatic biopolymers and proteins).

Fulvia Tambone; Laura Terruzzi; Barbara Scaglia; Fabrizio Adani

2014-01-01T23:59:59.000Z

303

Drastic changes in the molecular absorption at redshift z=0.89 toward the quasar PKS 1830-211  

E-Print Network [OSTI]

A 12 year-long monitoring of the absorption caused by a z=0.89 spiral galaxy on the line of sight to the radio-loud gravitationally lensed quasar PKS 1830-211 reveals spectacular changes in the HCO+ and HCN (2-1) line profiles. The depth of the absorption toward the quasar NE image increased by a factor of ~3 in 1998-1999 and subsequently decreased by a factor >=6 between 2003 and 2006. These changes were echoed by similar variations in the absorption line wings toward the SW image. Most likely, these variations result from a motion of the quasar images with respect to the foreground galaxy, which could be due to a sporadic ejection of bright plasmons by the background quasar. VLBA observations have shown that the separation between the NE and SW images changed in 1997 by as much as 0.2 mas within a few months. Assuming that motions of similar amplitude occurred in 1999 and 2003, we argue that the clouds responsible for the NE absorption and the broad wings of the SW absorption should be sparse and have characteristic sizes of 0.5-1 pc.

Sebastien Muller; Michel Guelin

2008-10-02T23:59:59.000Z

304

Distribution of the molecular absorption in front of the quasar B0218+357  

E-Print Network [OSTI]

The line of sight to the quasar B0218+357, one of the most studied lensed systems, intercepts a z=0.68 spiral galaxy, which splits its image into two main components A and B, separated by ca. 0.3'', and gives rise to molecular absorption. Although the main absorption component has been shown to arise in front of image A, it is not established whether some absorption from other velocity components is also occuring in front of image B. To tackle this question, we have observed the HCO+(2-1) absorption line during the commissioning phase of the new very extended configuration of the Plateau de Bure Interferometer, in order to trace the position of the absorption as a function of frequency. Visibility fitting of the self-calibrated data allowed us to achieve position accuracy between ~12 and 80 mas per velocity component. Our results clearly demonstrate that all the different velocity components of the HCO+(2-1) absorption arise in front of the south-west image A of the quasar. We estimate a flux ratio fA/fB = 4.2 (-1.0;+1.8 at 106 GHz.

S. Muller; M. Guelin; F. Combes; T. Wiklind

2007-04-07T23:59:59.000Z

305

PARALLACTIC MOTION FOR COMPANION DISCOVERY: AN M-DWARF ORBITING ALCOR  

SciTech Connect (OSTI)

The A5V star Alcor has an M3-M4 dwarf companion, as evidenced by a novel astrometric technique. Imaging spectroscopy combined with adaptive optics coronagraphy allowed for the detection and spectrophotometric characterization of the point source at a contrast of approx6 J- and H-band magnitudes and separation of 1'' from the primary star. The use of an astrometric pupil plane grid allowed us to determine the projected separations between the companion and the coronagraphically occulted primary star to <=3 mas precision at two observation epochs. Our measurements demonstrate common parallactic and proper motion over the course of 103 days, significantly shorter than the period of time needed for most companion confirmations through proper motion measurements alone. This common parallax method is potentially more rigorous than common proper motion, ensuring that the neighboring bodies lie at the same distance, rather than relying on the statistical improbability that two objects in close proximity to each other on the sky move in the same direction. The discovery of a low-mass (approx0.25 M{sub sun}) companion around a bright (V = 4.0 mag), nearby (d= 25 pc) star highlights a region of binary star parameter space that to date has not been fully probed.

Zimmerman, Neil; Oppenheimer, Ben R. [Department of Astronomy, Columbia University, 550 W 120th St, New York, NY 10027 (United States); Hinkley, Sasha; Hillenbrand, Lynne; Crepp, Justin R. [Department of Astronomy, California Institute of Technology, 1200 E. California Blvd., MC 249-17, Pasadena, CA 91125 (United States); Brenner, Douglas; Sivaramakrishnan, Anand [Astrophysics Department, American Museum of Natural History, Central Park West at W 79th St, New York, NY 10024 (United States); Parry, Ian R.; King, David L.; Hunt, Stephanie [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 OHA (United Kingdom); Beichman, Charles [NASA Exoplanet Science Institute, California Institute of Technology, Pasadena, CA 91125 (United States); Vasisht, Gautam; Roberts, Lewis C.; Burruss, Rick; Shao, Michael; Roberts, Jennifer E. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena CA 91109 (United States); Soummer, Remi [Space Telescope Science Institute, 3700 San Martin Dr, Baltimore, MD 21218 (United States); Dekany, Richard; Bouchez, Antonin, E-mail: neil@astro.columbia.ed, E-mail: bro@amnh.or [Caltech Optical Observatories, California Institute of Technology, Pasadena, CA 91125 (United States)

2010-02-01T23:59:59.000Z

306

Orbital parameters, masses and distance to Beta Centauri determined with the Sydney University Stellar Interferometer and high resolution spectroscopy  

E-Print Network [OSTI]

The bright southern binary star beta Centauri (HR 5267) has been observed with the Sydney University Stellar Interferometer (SUSI) and spectroscopically with the ESO CAT and Swiss Euler telescopes at La Silla. The interferometric observations have confirmed the binary nature of the primary component and have enabled the determination of the orbital parameters of the system. At the observing wavelength of 442 nm the two components of the binary system have a magnitude difference of 0.15. The combination of interferometric and spectroscopic data gives the following results: orbital period 357 days, semi-major axis 25.30 mas, inclination 67.4 degrees, eccentricity 0.821, distance 102.3 pc, primary and secondary masses M1 = M2 = 9.1 solar masses and absolute visual magnitudes of the primary and secondary M1V = -3.85 and M2V = -3.70. The high accuracy of the results offers a fruitful starting point for future asteroseismic modelling of the pulsating binary components.

Davis, J; Seneta, E B; Tango, W J; Booth, A J; O'Byrne, J W; Thorvaldson, E D; Ausseloos, M; Aerts, C; Uytterhoeven, K

2004-01-01T23:59:59.000Z

307

On the Criticality Safety of Transuranic Sodium Fast Reactor Fuel Transport Casks  

SciTech Connect (OSTI)

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.

Samuel Bays; Ayodeji Alajo

2010-05-01T23:59:59.000Z

308

Investigation of swirling flow mixing for application in an MHD pulverized coal combustor using isothermal modeling  

SciTech Connect (OSTI)

The purpose of this study was to investigate combustor reactant mixing with swirling oxidizer flow. The combustor configuration that was considered was designed to simulate a 4 lbm/sec mas flow pulverized coal combustor being tested in The University of Tennessee Space Institute MHD Facility. A one-fourth dimensionally scaled combustor model was developed for isothermal flow testing. A comparison was made of cold flow tests using 3 swirler designs with a base case oxidizer injector design of perforated plated which demonstrated acceptable performance in the 4 lbm/sec MHD combustor. The three swirlers that were evaluated were designed to allow a wide range of swirl intensity to be investigated. The design criterion of the swirler was the swirl number which has been related to swirler geometry. The results of the study showed that the swirlers that were tested fell short of the mixing characteristics displayed with the perforated plate base case oxidizer injector. Test data obtained with the cold flow model established that the actual swirl numbers of two of the swirlers were much lower than the design swirl numbers. Recirculation zones were defined for all configurations that were tested, and a comparison of velocity profiles was made for the configurations.

Power, W. H.

1980-05-01T23:59:59.000Z

309

The Last of FIRST: The Final Catalog and Source Identifications  

E-Print Network [OSTI]

The FIRST survey, begun over twenty years ago, provides the definitive high-resolution map of the radio sky. This VLA survey reaches a 20cm detection sensitivity of 1 mJy over 10,575 deg**2 largely coincident with the SDSS area. Images and a catalog containing 946,432 sources are available through the FIRST web site (http://sundog.stsci.edu). We record here the authoritative survey history, including hardware and software changes that affect the catalog's reliability and completeness. We use recent JVLA observations to test the survey astrometry and flux bias/scale. Our sidelobe-flagging algorithm finds that fewer than 10% of the catalogued objects are likely sidelobes; these are faint sources concentrated near bright sources, as expected. A match with the NRAO VLA Sky Survey shows very good consistency in flux scale and astrometry. Matches with 2MASS and SDSS indicate a systematic 10-20mas astrometric error with respect to the optical reference frame in old VLA data that has disappeared with the advent of th...

Helfand, David J; Becker, Robert H

2015-01-01T23:59:59.000Z

310

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

SciTech Connect (OSTI)

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.

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

311

SiO MASERS IN ASYMMETRIC MIRAS. III. IK TAURI  

SciTech Connect (OSTI)

This is the third paper in a series of multi-epoch observations at 7 mm wavelength of the SiO masers in several asymptotic giant branch stars from a sample of Mira variable stars showing evidence of asymmetric structure in the infrared. These stars have been observed interferometrically in the infrared by Infrared Optical Telescope Array and with Very Long Baseline Array measurements of the SiO masers. In this paper, we present the observations of IK Tauri (IK Tau). There is a persistent elliptical distribution of the masers around the star {approx}40 x {approx}30 mas in size with a major axis at position angle {approx}30 deg. The SiO masers in the circumstellar envelope exhibit large-scale systematic motions which reverse direction on timescales of a decade, roughly the interval between the ejections of dust shells. The orientations on the sky of the apparent rotation-like bulk motion and of the major axis of the maser ellipse differ by 37 deg. (2.5{sigma}) making any relationship uncertain. The systemic velocity of IK Tau is estimated to be 33.3 {+-} 1.0 km s{sup -1}. A comparison is made with the model calculations of Gray et al. which predict some but not all observed features.

Cotton, W. D. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 (United States); Ragland, S. [W. M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI 96743 (United States); Pluzhnik, E. A. [NASA-Ames Research Center, Moffett Field, CA 94035 (United States); Danchi, W. C. [NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics, Code 667, Greenbelt, MD 20771 (United States); Traub, W. A. [Jet Propulsion Laboratory, California Institute of Technology, M/S 301-451, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States); Willson, L. A. [Department of Physics and Astronomy, Iowa State University, Ames, IA 50014 (United States); Lacasse, M. G. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)], E-mail: bcotton@nrao.edu

2010-03-01T23:59:59.000Z

312

High proper motion X-ray binaries from the Yale Southern Proper Motion Survey  

E-Print Network [OSTI]

We discuss the results of cross-correlating catalogs of bright X-ray binaries with the Yale Southern Proper Motion catalog (version 4.0). Several objects already known to have large proper motions from Hipparcos are recovered. Two additional objects are found which show substantial proper motions, both of which are unusual in their X-ray properties. One is IGR J17544-2619, one of the supergiant fast X-ray transients. Assuming the quoted distances in the literature for this source of about 3 kpc are correct, this system has a peculiar velocity of about 275 km/sec -- greater than the velocity of a Keplerian orbit at its location of the Galaxy, and in line with the expectations formed from suggestions that the supergiant fast X-ray transients should be highly eccentric. We discuss the possibility that these objects may help explain the existence of short gamma-ray bursts outside the central regions of galaxies. The other is the source 2A~1822-371, which is a member of the small class of objects which are low mas...

Maccarone, Thomas J; Casetti-Dinescu, Dana I

2014-01-01T23:59:59.000Z

313

Holographic Experiments on Defects  

E-Print Network [OSTI]

Using the AdS/CFT correspondence, we study the anisotropic charge transport properties of both supersymmetric and non-supersymmetric matter fields on (2+1)-dimensional defects coupled to a (3+1)-dimensional ${\\cal N}=4$ SYM "heat bath". We focus on the case of a finite external background magnetic field, finite net charge density and finite mass. At high frequencies, we discover a spectrum of quasiparticle resonances due to the magnetic field and finite density and at small frequencies, we perform a Drude-like expansion around the DC limit. Both of these regimes display many generic features and some features that we attribute to strong coupling, such as a minimum DC conductivity and an unusual behavior of the "cyclotron" and plasmon frequencies, which become related to the resonances found in the conformal case in an earlier paper. We further study the hydrodynamic regime and the relaxation properties, from which the system displays a set of different possible transitions to the collisionless regime. The mas...

Wapler, Matthias C

2009-01-01T23:59:59.000Z

314

Enhancement of proliferation resistance properties of commercial \\{FBRs\\} by material barriers  

Science Journals Connector (OSTI)

The possibility to enhance proliferation resistance of discharged plutonium in the blanket of fast breeder reactor (FBR) has been investigated in terms of reactor core design aspects. It can be achieved by increasing the fraction of even-mass-number plutonium isotopes in the discharged plutonium. Although it can be achieved by a radial blanket-free core, it also decreases the breeding ratio. By loading the blanket with plutonium (Pu) or minor actinides (MAs) or Pu-MA combination, it is possible to reduce the attractiveness of discharged plutonium. However, the loading material in the blanket should be kept in balance with achievable core performances, fuel fabrication, and fuel handling, accordingly and hence the criteria needed to comply with. It is found that applying the attractiveness or FOM criteria that using the combination of even-mass-number plutonium isotopes need more material to be loaded than the one needed when applying Pellauds or Kesslers proposal that using only solely isotope fraction of plutonium.

Yoshitalia Meiliza; Shigeo Ohki; Katsuyuki Kawashima; Tsutomu Okubo

2014-01-01T23:59:59.000Z

315

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)

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.

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

316

Unusual activation of novel Au/TiO2/AI2O3 xH2O catalysts by calcination  

SciTech Connect (OSTI)

Au/Al{sub 2}O{sub 3} {center_dot} xH{sub 2}O and Au/TiO{sub 2}/Al{sub 2}O{sub 3} {center_dot} xH{sub 2}O (x = 0-3) catalysts were prepared by assembling gold nanoparticles on neat and TiO{sub 2}-modified Al{sub 2}O{sub 3}, AlOOH, and Al(OH){sub 3} supports, and their catalytic activity in CO oxidation was tested either as synthesized or after on-line pretreatment in O{sub 2}-He at 500 C. A promotional effect of TiO{sub 2} on the activity of gold catalysts was observed upon 500 C-pretreatment. The catalyst stability as a function of time on stream was tested in the absence or presence of H{sub 2}, and physiochemical characterization applying BET, ICP-OES, XRD, TEM, and {sup 27}Al MAS NMR was conducted.

Yan, Wenfu [ORNL; Ma, Zhen [ORNL; Mahurin, Shannon Mark [ORNL; Overbury, Steven {Steve} H [ORNL; Dai, Sheng [ORNL

2008-01-01T23:59:59.000Z

317

X-ray Crystallographic, Scanning Microprobe X-ray Diffraction, and Cross-Polarized/Magic Angle Spinning [superscript 13]C NMR Studies of the Structure of Cellulose III[subscript II  

SciTech Connect (OSTI)

The X-ray crystallographic structure of cellulose III{sub II} is characterized by disorder; the unit cell (space group P2{sub 1}; a = 4.45 {angstrom}, b = 7.64 {angstrom}, c = 10.36 {angstrom}, {alpha} = {beta} = 90{sup o}, {gamma} = 106.96{sup o}) is occupied by one chain that is the average of statistically disordered antiparallel chains. {sup 13}C CP/MAS NMR studies reveal the presence of three distinct molecular conformations that can be interpreted as a mixture of two different crystal forms, one equivalent to cellulose III{sub I}, and another with two independent glucosyl conformations in the asymmetric unit. Both X-ray crystallographic and {sup 13}C NMR spectroscopic results are consistent with an aggregated microdomain structure for cellulose III{sub II}. This structure can be generated from a new crystal form (space group P2{sub 1}; a = 4.45 {angstrom}, b = 14.64 {angstrom}, c = 10.36 {angstrom}, {alpha} = {beta} = 90{sup o}, {gamma} = 90.05{sup o}; two crystallographically independent and antiparallel chains; gt hydroxymethyl groups) by multiple dislocation defects. These defects produce microdomains of the new crystal form and cellulose III{sub I} that scanning microprobe diffraction studies show are distributed consistently through the cellulose III{sub II} fiber.

Wada, Masahisa; Heux, Laurent; Nishiyama, Yoshiharu; Langan, Paul; (U of Tokyo); (CNRS-CRMD); (LANL)

2009-03-16T23:59:59.000Z

318

SYNCHROTRON X-RAY MICROTOMOGRAPHY, ELECTRON PROBE MICROANALYSIS, AND NMR OF TOLUENE WASTE IN CEMENT.  

SciTech Connect (OSTI)

Synchrotron X-ray microtomography shows vesicular structures for toluene/cement mixtures, prepared with 1.22 to 3.58 wt% toluene. Three-dimensional imaging of the cured samples shows spherical vesicles, with diameters ranging from 20 to 250 {micro}m; a search with EPMA for vesicles in the range of 1-20 {micro}m proved negative. However, the total vesicle volume, as computed from the microtomography images, accounts for less than 10% of initial toluene. Since the cements were cured in sealed bottles, the larger portion of toluene must be dispersed within the cement matrix. Evidence for toluene in the cement matrix comes from {sup 29}Si MAS NMR spectroscopy, which shows a reduction in chain silicates with added toluene. Also, {sup 2}H NMR of d{sub 8}-toluene/cement samples shows high mobility for all, toluene and thus no toluene/cement binding. A model that accounts for all observations follows: For loadings below about 3 wt%, most toluene is dispersed in the cement matrix, with a small fraction of the initial toluene phase separating from the cement paste and forming vesicular structures that are preserved in the cured cement. Furthermore, at loadings above 3 wt%, the abundance of vesicles formed during toluene/cement paste mixing leads to macroscopic phase separation (most toluene floats to the surface of the cement paste).

BUTLER,L.G.

1999-07-22T23:59:59.000Z

319

The Stability of Organic Solvents and Carbon Electrode in Nonaqueous Li-O2 Batteries  

SciTech Connect (OSTI)

The effect of different kinds of aprotic organic solvents on the discharge performance and discharge products in Li-O2 batteries was systematically investigated. The discharge products deposited in air cathodes were analyzed by X-ray diffraction, in situ gas chromatography/mass spectroscopy and X-ray photoelectron spectroscopy. We found that a significant amount of Li2O2 can be formed in glyme-based electrolytes during the discharge process, while only small amount of Li2O2 is produced in electrolytes of phosphate, nitrile, ionic liquid and sulfoxide. However, in all the seven types of solvent systems we studied, Li2CO3 and LiF were still formed as byproducts whose compositions are strongly related to the solvents. Li2CO3 is produced not from the carbon air electrode but from oxidation and decomposition of the solvent as we verified by using a 13C-labeled carbon electrode and the solid-state 13C-MAS NMR technique. The formation of Li2CO3 and LiF during discharge will greatly reduce the Coulombic efficiency and cycle life of the Li-air batteries. Therefore, better electrolytes that can ensure the formation of Li2O2 but minimize other reaction products formed on air electrodes of Li-air batteries need to be further investigated.

Xu, Wu; Hu, Jian Z.; Engelhard, Mark H.; Towne, Silas A.; Hardy, John S.; Xiao, Jie; Feng, Ju; Hu, Mary Y.; Zhang, Jian; Ding, Fei; Gross, Mark E.; Zhang, Jiguang

2012-05-18T23:59:59.000Z

320

PSR B0329+54: Substructure in the scatter-broadened image discovered with RadioAstron on baselines of up to 235,000 km  

E-Print Network [OSTI]

We studied scattering properties of the pulsar PSR B0329+54 with a ground-space radio interferometer RadioAstron which included the 10-m Space Radio Telescope, the 110-m Green Bank Telescope, the 14x25-m Westerbork Synthesis Radio Telescope, and the 64-m Kalyazin Radio Telescope. The observations were performed at 324 MHz on baselines of up to 235,000 km in November 2012 and January 2014. At short ground-space baselines of less than about 20,000 km, the visibility amplitude decreases with the projected baseline length, providing a direct measurement of the diameter of the scattering disk of 4.7$\\pm$0.9 mas. The size of the diffraction spot near Earth is 15,000$\\pm$3,000 km. At longer baselines of up to 235,000 km, where no interferometric detection of the scattering disk would be expected, significant visibilities were observed with amplitudes scattered around a constant value. These detections result in a discovery of a substructure in the completely resolved scatter-broadened image of the pointlike source, ...

Popov, M V; Bartel, N; Gwinn, C R; Johnson, M D; Joshi, B C; Kardashev, N S; Karuppusamy, R; Kovalev, Y Y; Kramer, M; Rudnitskii, A G; Safutdinov, E R; Shishov, V I; Smirnova, T V; Soglasnov, V A; Zensus, J A; Zhuravlev, V I

2015-01-01T23:59:59.000Z

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321

Multiangle Observations of Arctic Clouds from FIRE ACE: June 3, 1998 Case Study  

SciTech Connect (OSTI)

In May and June 1998 the Airborne Multiangle Imaging Spectroradiometer (AirMISR) participated in the FIRE Arctic Cloud Experiment (ACE). AirMISR is an airborne instrument for obtaining multiangle imagery similar to that of the satellite-borne MISR instrument. This paper presents a detailed analysis of the data collected on June 3, 1998. In particular, AirMISR radiance measurements are compared with measurements made by two other instruments, the Cloud Absorption Radiometer (CAR) and the MODIS airborne simulator (MAS), as well as to plane-parallel radiative transfer simulations. It is found that the AirMISR radiance measurements and albedo estimates compare favorably both with the other instruments and with the radiative transfer simulations. In addition to radiance and albedo, the multiangle AirMISR data can be used to obtain estimates of cloud top height using stereoimaging techniques. Comparison of AirMISR retrieved cloud top height (using the complete MISR-based stereoimaging approach) shows excellent agreement with the measurements from the airborne Cloud Lidar System (CLS) and ground-based millimeter-wave cloud radar.

Marchand, Roger T.; Ackerman, Thomas P.; King, M. D.; Moroney, C.; Davies, R.; Muller, J.-P. A. L.; Gerber, H.

2001-07-27T23:59:59.000Z

322

Hydroconversion reactions catalyzed by highly stable pillared clays  

SciTech Connect (OSTI)

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.

Gomez, S.A.; Mosqueira, L.; Espinosa, J.; Fuentes, G.A. [Universidad A. Metropolitana-Iztapalapa (Mexico)

1993-12-31T23:59:59.000Z

323

DISTANCE AND KINEMATICS OF THE TW HYDRAE ASSOCIATION FROM PARALLAXES  

SciTech Connect (OSTI)

From common proper motion and signatures of youth, researchers have identified about 30 members of a putative TW Hydrae Association. Only four of these had parallactic distances from Hipparcos. We have measured parallaxes and proper motions for 14 primary members. We combine these with literature values of radial velocities to show that the Galactic space motions of the stars, with the exception of TWA 9 and 22, are parallel and do not indicate convergence at a common formation point sometime in the last few million years. The space motions of TWA 9 and 22 do not agree with the others and indicate that they are not TWA members. The median parallax is 18 mas or 56 pc. We further analyze the stars' absolute magnitudes on pre-main-sequence evolutionary tracks and find a range of ages with a median of 10.1 Myr and no correlation between age and Galactic location. The TWA stars may have formed from an extended and filamentary molecular cloud but are not necessarily precisely coeval.

Weinberger, Alycia J.; Boss, Alan P. [Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, DC 20015 (United States)] [Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, DC 20015 (United States); Anglada-Escude, Guillem, E-mail: weinberger@dtm.ciw.edu [Institut fuer Astrophysik, Universitaet Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen (Germany)] [Institut fuer Astrophysik, Universitaet Goettingen, Friedrich-Hund-Platz 1, 37077 Goettingen (Germany)

2013-01-10T23:59:59.000Z

324

Hydrogen Storage Properties of New Hydrogen-Rich BH3NH3-Metal Hydride (TiH2, ZrH2, MgH2, and/or CaH2) Composite Systems  

SciTech Connect (OSTI)

Ammonia borane (AB = NH3BH3) is one of the most attractive materials for chemical hydrogen storage due to its high hydrogen contents of 19.6 wt.%, however, impurity levels of borazine, ammonia and diborane in conjunction with foaming and exothermic hydrogen release calls for finding ways to mitigate the decomposition reactions. In this paper we present a solution by mixing AB with metal hydrides (TiH2, ZrH2, MgH2 and CaH2) which have endothermic hydrogen release in order to control the heat release and impurity levels from AB upon decomposition. The composite materials were prepared by mechanical ball milling, and their H2 release properties were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The formation of volatile products from decomposition side reactions, such as borazine (N3B3H6) was determined by mass spectrometry (MS). Sieverts type pressure-composition-temperature (PCT) gas-solid reaction instrument was adopted to observe the kinetics of the H2 release reactions of the combined systems and neat AB. In situ 11B MAS-NMR revealed a destabilized decomposition pathway. We found that by adding specific metal hydrides to AB we can eliminate the impurities and mitigate the heat release.

Choi, Young Joon; Xu, Yimin; Shaw, Wendy J.; Ronnebro, Ewa

2012-04-19T23:59:59.000Z

325

Synthesis and characterization of nanoapatites organofunctionalized with aminotriphosphonate agents  

SciTech Connect (OSTI)

Organofunctionalized apatite nanoparticles were prepared using a one step process involving dissolution/precipitation of natural phosphate rock and covalent grafting of nitrilotris(methylene)triphosphonate (NTP). The synthesized materials were characterized by Brunauer-Emmett-Teller (BET) surface measurement, thermogravimetry, inductively coupled plasma emission spectroscopy (ICP-ES), elemental analysis, multinuclear solid state cross-polarization/magic angle spinning (CP/MAS) and single-pulse NMR spectroscopy, transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDXA). After grafting BET measurements yielded particle specific surface areas ranging from 88 to 193 m{sup 2} g{sup -1} depending on the grafted phosphonate. The results show that the surfaces of the nanoapatite particles can be covered with functional groups bound through a variable number of R-P-O-Ca bonds to render them organoapatites. - Graphical Abstract: Hydroxyapatite in the form of naturally occurring phosphate rock is converted in the presence of nitrilotris(methylene)triphosphonate (NTP) to high surface area apatite nanoparticles (dimensions measured by TEM) with NTP-functionalized surfaces. Highlights: Black-Right-Pointing-Pointer Surface functionalized hydroxyapatite nanoparticles are prepared from natural phosphate rock in a one-step process. Black-Right-Pointing-Pointer Covalent grafting of amine phosphonates to the nanoparticle surface is simultaneously accomplished by the presence of the organic molecules in the solution. Black-Right-Pointing-Pointer Mesoporous particles of high surface area are created. Black-Right-Pointing-Pointer Surface coverage is controlled by the concentration of amine phosphonate.

Saoiabi, Sanaa [Laboratoire de Chimie Physique Generale, Faculte des Sciences BP 1014, Universite Mohamed V-Agdal, Rabat (Morocco); UPMC Univ Paris 06, UMR 7574, Chimie de la Matiere Condensee de Paris, 4 Place Jussieu, F-75005 Paris (France); Biomaterials Laboratory, Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Room 2320, 149 13 Street, Charlestown, MA 02129 (United States); El Asri, Sanae [Laboratoire de Chimie Physique Generale, Faculte des Sciences BP 1014, Universite Mohamed V-Agdal, Rabat (Morocco); Laghzizil, Abdelaziz, E-mail: laghzizi@fsr.ac.ma [Laboratoire de Chimie Physique Generale, Faculte des Sciences BP 1014, Universite Mohamed V-Agdal, Rabat (Morocco); Masse, Sylvie [UPMC Univ Paris 06, UMR 7574, Chimie de la Matiere Condensee de Paris, 4 Place Jussieu, F-75005 Paris (France); Ackerman, Jerome L., E-mail: jerry@nmr.mgh.harvard.edu [Biomaterials Laboratory, Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Room 2320, 149 13 Street, Charlestown, MA 02129 (United States)

2012-01-15T23:59:59.000Z

326

On a recent preliminary study for the measurement of the Lense-Thirring effect with the Galileo satellites  

E-Print Network [OSTI]

It has been recently proposed to combine the node drifts of the future constellation of 27 Galileo spacecraft together with those of the existing LAGEOS-type satellites to improve the accuracy of the past and ongoing tests of the Lense-Thirring (LT) effect by removing the bias of a larger number of even zonal harmonics $J_{\\ell}$ than either done or planned so far. Actually, it seems a difficult goal to be realistically achieved for a number of reasons. First, the LT range signature of a Galileo-type satellite is as little as $0.5$ mm over 3-days arcs, corresponding to a node rate of just $\\dot\\Omega_{\\rm LT}=2$ milliarcseconds per year (mas yr$^{-1}$). Some tesseral and sectorial ocean tides such as $K_1,K_2$ induce long-period harmonic node perturbations with frequencies which are integer multiples of the extremely slow Galileo's node rate $\\dot\\Omega$ completing a full cycle in about 40 yr. Thus, over time spans $T$ of some years they would act as superimposed semi-secular aliasing trends. Since the coeffi...

Iorio, Lorenzo

2014-01-01T23:59:59.000Z

327

Thermo-physical and structural studies of sodium zinc borovanadate glasses in the region of high concentration of modifier oxides  

SciTech Connect (OSTI)

Highlights: ? Highly modified sodium zinc borovanadate glasses. ? Structural model for borovanadate glasses. ? Network forming tendency of ZnO in borovanadate glasses. ? Fragility can be limited to NBO concentration in borovanadate glasses. -- Abstract: This paper reports investigation of Na{sub 2}O and ZnO modified borovanadate glasses in the highly modified regime of compositions. These glasses have been prepared by microwave route. Ultraviolet (UV) and visible, infrared (IR), Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies have been used to characterize the speciation in the glasses. Together with the variation of properties such as molar volume and glass transition temperatures, spectroscopic data indicate that at high levels of modification, ZnO tends to behave like network former. It is proposed that the observed variation of all the properties can be reasonably well understood with a structural model. The model considers that the modification and speciation in glasses are strongly determined by the hierarchy of group electronegativities. Further, it is proposed that the width of the transitions of glasses obtained under same condition reflects the fragility of the glasses. An empirical expression has been suggested to quantify fragility on the basis of width of the transition regions.

Chethana, B.K. [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India)] [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India); Reddy, C. Narayana [Maharani's Science College for Women, Bangalore 560 001 (India)] [Maharani's Science College for Women, Bangalore 560 001 (India); Rao, K.J., E-mail: kalyajrao@yahoo.co.in [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India)

2012-07-15T23:59:59.000Z

328

Quantitatively Probing the Al Distribution in Zeolites  

SciTech Connect (OSTI)

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.

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

329

An ancient F-type subdwarf from the halo crossing the Galactic plane  

E-Print Network [OSTI]

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]...

Scholz, R -D; Heuser, C; Ziegerer, E; Geier, S; Niederhofer, F

2015-01-01T23:59:59.000Z

330

The orbital motion of the Quintuplet cluster - a common origin for the Arches and Quintuplet clusters?  

E-Print Network [OSTI]

We investigate the orbital motion of the Quintuplet cluster near the Galactic center with the aim of constraining formation scenarios of young, massive star clusters in nuclear environments. Three epochs of adaptive optics high-angular resolution imaging with Keck/NIRC2 and VLT/NACO were obtained over a time baseline of 5.8 years, delivering an astrometric accuracy of 0.5-1 mas/yr. Proper motions were derived in the cluster reference frame and were used to distinguish cluster members from the majority of field stars. Fitting the cluster and field proper motion distributions with 2D gaussian models, we derive the orbital motion of the cluster for the first time. The Quintuplet is moving with a 2D velocity of 132 +/- 15 km/s with respect to the field along the Galactic plane, which yields a 3D orbital velocity of 167 +/- 15 km/s when combined with the previously known radial velocity. From a sample of 119 stars measured in three epochs, we derive an upper limit to the velocity dispersion in the core of the Quin...

Stolte, Andrea; Morris, Mark R; Ghez, Andrea M; Brandner, Wolfgang; Lu, Jessica R; Clarkson, William I; Habibi, Maryam; Matthews, Keith

2014-01-01T23:59:59.000Z

331

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

SciTech Connect (OSTI)

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.

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

332

AN ASTROMETRIC SEARCH FOR A SUB-STELLAR COMPANION OF THE M8.5 DWARF TVLM 51346546 USING VERY LONG BASELINE INTERFEROMETRY  

SciTech Connect (OSTI)

We conducted multi-epoch very long baseline interferometry observations to search for astrometric reflex motion that would be caused by a sub-stellar companion of the M8.5 dwarf TVLM 51346546. The observations yield an absolute parallax corresponding to a distance of 10.762 0.027 pc and a proper motion of 78.09 0.17 mas yr{sup 1}. The averaged flux density per epoch varies by a factor of at least three. From the absence of significant residual motion, we place an upper limit on any reflex motion caused by a companion, extending the parameter space covered by previous near-infrared direct-imaging searches. The data exclude a phase space of companion masses and orbital periods ranging from 3.8 M{sub Jup} with an orbital radius of ?0.05 AU (and an orbital period of 16 days) to 0.3 M{sub Jup} with an orbital radius of ?0.7 AU (and an orbital period of 710 days)

Forbrich, Jan; Berger, Edo; Reid, Mark J. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2013-11-01T23:59:59.000Z

333

Structure of rhenium-containing sodium borosilicate glass  

SciTech Connect (OSTI)

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.

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

334

Parallel Index and Query for Large Scale Data Analysis  

SciTech Connect (OSTI)

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.

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

335

Advance Resource Provisioning in Bulk Data Scheduling  

SciTech Connect (OSTI)

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.

Balman, Mehmet

2012-10-01T23:59:59.000Z

336

125Te NMR chemical-shift trends in PbTeGeTe and PbTeSnTe alloys  

SciTech Connect (OSTI)

Complex tellurides, such as doped PbTe, GeTe, and their alloys, are among the best thermoelectric materials. Knowledge of the change in 125Te NMR chemical shift due to bonding to dopant or solute atoms is useful for determination of phase composition, peak assignment, and analysis of local bonding. We have measured the 125Te NMR chemical shifts in PbTe-based alloys, Pb1?xGexTe and Pb1?xSnxTe, which have a rocksalt-like structure, and analyzed their trends. For low x, several peaks are resolved in the 22-kHz MAS 125Te NMR spectra. A simple linear trend in chemical shifts with the number of Pb neighbors is observed. No evidence of a proposed ferroelectric displacement of Ge atoms in a cubic PbTe matrix is detected at low Ge concentrations. The observed chemical shift trends are compared with the results of DFT calculations, which confirm the linear dependence on the composition of the first-neighbor shell. The data enable determination of the composition of various phases in multiphase telluride materials. They also provide estimates of the 125Te chemical shifts of GeTe and SnTe (+970 and +400150 ppm, respectively, from PbTe), which are otherwise difficult to access due to Knight shifts of many hundreds of ppm in neat GeTe and SnTe.

Njegic, Bosiljka [Ames Laboratory; Levin, Evgenii M. [Ames Laboratory; Schmidt-Rohr, Klaus [Ames Laboratory

2013-10-08T23:59:59.000Z

337

Finding optimum route of electrical energy transmission line using multi-criteria with Q-learning  

Science Journals Connector (OSTI)

Due to an increasing energy requirement the consideration of route determination is becoming important. The aim of this project is to find an optimum result considering its important criteria. Finding an optimum route is a complex problem. It does not mean the shortest path to the problem. It is important to find the best way under the criterion that is determined by experts. Because of this we did not use the classical shortest path algorithm and we applied one of algorithms of the Artificial Intelligence. In this work, Geographic Information System (GIS)-based energy transmission route planning had been performed. In this optimization, using Multiagent Systems (MAS) which is a subdirectory of Distributed Artificial Intelligence the multi-criteria affecting energy transmission line (ETL) had been severally analyzed. The application had been actualized on the Selcuk University Campus Area. Therefore, the digital map of the campus area particularly had been composed containing of relevant criteria. Using Q- learning Algorithm of Multiagent System the optimum route had been determined.

Semiye Demircan; Musa Aydin; S. Savas Durduran

2011-01-01T23:59:59.000Z

338

HD 140283: A STAR IN THE SOLAR NEIGHBORHOOD THAT FORMED SHORTLY AFTER THE BIG BANG  

SciTech Connect (OSTI)

HD 140283 is an extremely metal-deficient and high-velocity subgiant in the solar neighborhood, having a location in the Hertzsprung-Russell diagram where absolute magnitude is most sensitive to stellar age. Because it is bright, nearby, unreddened, and has a well-determined chemical composition, this star avoids most of the issues involved in age determinations for globular clusters. Using the Fine Guidance Sensors on the Hubble Space Telescope, we have measured a trigonometric parallax of 17.15 {+-} 0.14 mas for HD 140283, with an error one-fifth of that determined by the Hipparcos mission. Employing modern theoretical isochrones, which include effects of helium diffusion, revised nuclear reaction rates, and enhanced oxygen abundance, we use the precise distance to infer an age of 14.46 {+-} 0.31 Gyr. The quoted error includes only the uncertainty in the parallax, and is for adopted surface oxygen and iron abundances of [O/H] = -1.67 and [Fe/H] = -2.40. Uncertainties in the stellar parameters and chemical composition, especially the oxygen content, now contribute more to the error budget for the age of HD 140283 than does its distance, increasing the total uncertainty to about {+-}0.8 Gyr. Within the errors, the age of HD 140283 does not conflict with the age of the Universe, 13.77 {+-} 0.06 Gyr, based on the microwave background and Hubble constant, but it must have formed soon after the big bang.

Bond, Howard E.; Nelan, Edmund P. [Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 (United States); VandenBerg, Don A. [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6 (Canada); Schaefer, Gail H. [The CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA 91023 (United States); Harmer, Dianne, E-mail: bond@stsci.edu, E-mail: nelan@stsci.edu, E-mail: vandenbe@uvic.ca, E-mail: schaefer@chara-array.org, E-mail: diharmer@noao.edu [National Optical Astronomy Observatories, 950 North Cherry Avenue, Tucson, AZ 85726 (United States)

2013-03-01T23:59:59.000Z

339

Deteriorated hardened cement paste structure analyzed by XPS and {sup 29}Si NMR techniques  

SciTech Connect (OSTI)

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.

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

340

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)

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.

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

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341

MOJAVE. X. PARSEC-SCALE JET ORIENTATION VARIATIONS AND SUPERLUMINAL MOTION IN ACTIVE GALACTIC NUCLEI  

SciTech Connect (OSTI)

We describe the parsec-scale kinematics of 200 active galactic nucleus (AGN) jets based on 15 GHz Very Long Baseline Array (VLBA) data obtained between 1994 August 31 and 2011 May 1. We present new VLBA 15 GHz images of these and 59 additional AGNs from the MOJAVE and 2 cm Survey programs. Nearly all of the 60 most heavily observed jets show significant changes in their innermost position angle over a 12-16 yr interval, ranging from 10 to 150 on the sky, corresponding to intrinsic variations of ?0.5 to ?2. The BL Lac jets show smaller variations than quasars. Roughly half of the heavily observed jets show systematic position angle trends with time, and 20 show indications of oscillatory behavior. The time spans of the data sets are too short compared to the fitted periods (5-12 yr), however, to reliably establish periodicity. The rapid changes and large jumps in position angle seen in many cases suggest that the superluminal AGN jet features occupy only a portion of the entire jet cross section and may be energized portions of thin instability structures within the jet. We have derived vector proper motions for 887 moving features in 200 jets having at least five VLBA epochs. For 557 well-sampled features, there are sufficient data to additionally study possible accelerations. We find that the moving features are generally non-ballistic, with 70% of the well-sampled features showing either significant accelerations or non-radial motions. Inward motions are rare (2% of all features), are slow (<0.1 mas yr{sup 1}), are more prevalent in BL Lac jets, and are typically found within 1 mas of the unresolved core feature. There is a general trend of increasing apparent speed with distance down the jet for both radio galaxies and BL Lac objects. In most jets, the speeds of the features cluster around a characteristic value, yet there is a considerable dispersion in the distribution. Orientation variations within the jet cannot fully account for the dispersion, implying that the features have a range of Lorentz factor and/or pattern speed. Very slow pattern speed features are rare, comprising only 4% of the sample, and are more prevalent in radio galaxy and BL Lac jets. We confirm a previously reported upper envelope to the distribution of speed versus beamed luminosity for moving jet features. Below 10{sup 26} W Hz{sup 1} there is a fall-off in maximum speed with decreasing 15 GHz radio luminosity. The general shape of the envelope implies that the most intrinsically powerful AGN jets have a wide range of Lorentz factors up to ?40, while intrinsically weak jets are only mildly relativistic.

Lister, M. L.; Richards, J. L. [Department of Physics, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907 (United States); Aller, M. F.; Aller, H. D. [Department of Astronomy, University of Michigan, 817 Dennison Building, Ann Arbor, MI 48109 (United States); Homan, D. C. [Department of Physics, Denison University, Granville, OH 43023 (United States); Kellermann, K. I. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Kovalev, Y. Y. [Astro Space Center of Lebedev Physical Institute, Profsoyuznaya 84/32, 117997 Moscow (Russian Federation); Pushkarev, A. B.; Ros, E.; Savolainen, T., E-mail: mlister@purdue.edu [Max-Planck-Institut fr Radioastronomie, Auf dem Hgel 69, D-53121 Bonn (Germany)

2013-11-01T23:59:59.000Z

342

Recreation of Brnsted acid sites in phosphorus-modified HZSM-5(Ga) by modification with various metal cations  

Science Journals Connector (OSTI)

Abstract To investigate the recreation of Brnsted acid sites in phosphorus-modified HZSM-5(Ga) zeolites by modification with various metal cations, we prepared several HZSM-5(Ga) zeolites co-modified with Mg, Ca, La or Zr and P (M/P/HZSM-5(Ga)). From FT-IR, 31P MAS NMR, and NH3-TPD measurements, it was found that the introduced metal cations (M) of Mg, Ca, La, and Zr react with the pre-introduced phosphorus to generate phosphorus species such as Mx(PO4)y, resulting in the recreation of some native Brnsted acid sites (Si(OH)Ga). The degree of recreation of the Brnsted acid sites was strongly dependent on the M/Ga ratio and doped metal valence. Modification with La and Zr that have higher valences more effectively recreated the Brnsted acid sites compared to Mg and Ca, which have di-valence. The conversion of ethanol to propylene was carried out over the M/P/HZSM-5(Ga). The propylene yield increased with increasing M/Ga ratio and reached maximum values of ca. 26C-% for Zr/P/HZSM-5(Ga) with a Zr/Ga ratio of 0.25 and ca. 29C-% for La/P/HZSM-5(Ga) with a La/Ga ratio of 0.4. The propylene yield hardly changed for the co-modified HZSM-5(Ga) zeolites during the 24h of reaction time, indicating the suppression of both carbonaceous deposition and the release of gallium from the zeolite framework.

Nao Tsunoji; Takushi Sonoda; Yoshiyasu Furumoto; Masahiro Sadakane; Tsuneji Sano

2014-01-01T23:59:59.000Z

343

Faint Radio Sources in the NOAO Bootes Field. VLBA Imaging And Optical Identifications  

SciTech Connect (OSTI)

As a step toward investigating the parsec-scale properties of faint extragalactic radio sources, the Very Long Baseline Array (VLBA) was used at 5.0 GHz to obtain phase-referenced images of 76 sources in the NOAO Booetes field. These 76 sources were selected from the FIRST catalog to have peak flux densities above 10 mJy at 5'' resolution and deconvolved major diameters of less than 3'' at 1.4 GHz. Fifty-five of these faint radio sources were identified with accretion-powered radio galaxies and quasars brighter than 25.5 mag in the optical I band. On VLA scales at 1.4 GHz, a measure of the compactness of the faint sources (the ratio of the peak flux density from FIRST to the integrated flux density from the NVSS catalog) spans the full range of possibilities arising from source-resolution effects. Thirty of the faint radio sources, or 39{sub -7}{sup +9}%, were detected with the VLBA at 5.0 GHz with peak flux densities above 6 {sigma} {approx} 2 mJy at 2 mas resolution. The VLBA detections occur through the full range of compactness ratios. The stronger VLBA detections can themselves serve as phase-reference calibrators, boding well for opening up much of the radio sky to VLBA imaging. For the adopted cosmology, the VLBA resolution corresponds to 17 pc or finer. Most VLBA detections are unresolved or slightly resolved but one is diffuse and five show either double or core-jet structures; the properties of these latter six are discussed in detail. Eight VLBA detections are unidentified and fainter than 25.5 mag in the optical I band; their properties are highlighted because they likely mark optically-obscured active nuclei at high redshift.

Wrobel, J.M.; /NRAO, Socorro; Taylor, Greg B.; /NRAO, Socorro /KIPAC, Menlo Park; Rector, T.A.; /NRAO, Socorro /Alaska U.; Myers, S.T.; /NRAO, Socorro; Fassnacht, C.D.; /UC,

2005-06-13T23:59:59.000Z

344

ESTABLISHING {alpha} Oph AS A PROTOTYPE ROTATOR: IMPROVED ASTROMETRIC ORBIT  

SciTech Connect (OSTI)

The nearby star {alpha} Oph (Ras Alhague) is a rapidly rotating A5IV star spinning at {approx} 89% of its breakup velocity. This system has been imaged extensively by interferometric techniques, giving a precise geometric model of the star's oblateness and the resulting temperature variation on the stellar surface. Fortuitously, {alpha} Oph has a previously known stellar companion, and characterization of the orbit provides an independent, dynamically based check of both the host star and the companion mass. Such measurements are crucial to constrain models of such rapidly rotating stars. In this study, we combine eight years of adaptive optics imaging data from the Palomar, AEOS, and CFHT telescopes to derive an improved, astrometric characterization of the companion orbit. We also use photometry from these observations to derive a model-based estimate of the companion mass. A fit was performed on the photocenter motion of this system to extract a component mass ratio. We find masses of 2.40{sup +0.23}{sub -0.37} M{sub sun} and 0.85{sup +0.06}{sub -0.04} M{sub sun} for {alpha} Oph A and {alpha} Oph B, respectively. Previous orbital studies of this system found a mass too high for this system, inconsistent with stellar evolutionary calculations. Our measurements of the host star mass are more consistent with these evolutionary calculations, but with slightly higher uncertainties. In addition to the dynamically derived masses, we use IJHK photometry to derive a model-based mass for {alpha} Oph B, of 0.77 {+-} 0.05 M{sub sun} marginally consistent with the dynamical masses derived from our orbit. Our model fits predict a periastron passage on 2012 April 19, with the two components having a 50 mas separation from 2012 March to May. A modest amount of interferometric and radial velocity data during this period could provide a mass determination of this star at the few percent level.

Hinkley, Sasha; Hillenbrand, Lynne; Crepp, Justin R. [Department of Astronomy, California Institute of Technology, 1200 E. California Blvd., MC 249-17, Pasadena, CA 91125 (United States); Monnier, John D. [Astronomy Department, University of Michigan, 941 Dennison Bldg., Ann Arbor, MI 48109-1090 (United States); Oppenheimer, Ben R.; Brenner, Douglas; Sivaramakrishnan, Anand [Astrophysics Department, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States); Roberts, Lewis C. Jr; Zhao Ming; Vasisht, Gautam; Pueyo, Laurent [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States); Ireland, Michael [School of Physics, University of Sydney, NSW 2006 (Australia); Zimmerman, Neil [Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027 (United States); Parry, Ian R. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Martinache, Frantz [National Astronomical Observatory of Japan, Subaru Telescope, Hilo, HI 96720 (United States); Lai, Olivier [CFHT Corp., 65-1238 Mamalahoa Hwy., Kamuela, HI 96743 (United States); Soummer, Remi [STScI, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Beichman, Charles [NASA Exoplanet Science Institute, California Institute of Technology, Pasadena, CA 91125 (United States); Lloyd, James P.; Bernat, David [Department of Astronomy, Cornell University, Ithaca, NY 14853 (United States)

2011-01-10T23:59:59.000Z

345

Class B0631+519: Last of the Class Lenses  

SciTech Connect (OSTI)

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.

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

346

Concurrent Collections (CnC): A new approach to parallel programming  

ScienceCinema (OSTI)

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.

None

2011-10-06T23:59:59.000Z

347

IMPROVED CATALYSTS FOR HEAVY OIL UPGRADING BASED ON ZEOLITE Y NANOPARTICLES ENCAPSULATED IN STABLE NANOPOROUS HOST  

SciTech Connect (OSTI)

Composite materials of SBA-15/zeolite Y were synthesized from zeolite Y precursor and a synthesis mixture of mesoporous silicate SBA-15 via a hydrothermal process in the presence of a slightly acidic media of pH 4-6 with 2M H{sub 2}SO{sub 4}. The SBA-15/ZY composites showed Type IV adsorption isotherms, narrow BJH average pore size distribution of 4.9 nm, surface areas up to 800 m{sup 2}2/g and pore volumes 1.03 cm{sup 3}, all comparable to pure SBA-15 synthesized under similar conditions. Chemical analysis revealed Si/Al ratio down to 8.5 in the most aluminated sample, and {sup 27}AlSS MAS NMR confirmed aluminum was in tetrahedral coordination. This method of introduction of Al in pure T{sub d} coordination is effective in comparison to other direct and post synthesis alumination methods. Bronsted acid sites were evident from a pyridinium peak at 1544 cm-1 in the FTIR spectrum after pyridine adsorption, and from NH{sub 3} -TPD experiments. SBA-15/ZY composites showed significant catalytic activities for the dealkylation of isopropylbenzene to benzene and propene, similar to those of commercial zeolite Y. It was observed that higher conversion for catalysts synthesized with high amount of ZY precursor mixture added to the SBA-15. Over all the composites has shown good catalytic activity. Further studies will be focused on gaining a better understand the nature of the precursor, and to characterize and to locate the acid sites in the composite material. The composite will also be evaluated for heavy oil conversion to naphtha and middle distillates.

Conrad Ingram; Mark Mitchell

2005-11-15T23:59:59.000Z

348

A SEARCH FOR HIGH PROPER MOTION T DWARFS WITH Pan-STARRS1 + 2MASS + WISE  

SciTech Connect (OSTI)

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.

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

349

Two dimensional NMR and NMR relaxation studies of coal structure  

SciTech Connect (OSTI)

This report covers the progress made on the title project and summarizes the accomplishments for the project period. Four major areas of inquiry have been pursued. Advanced solid state NMR methods are being developed to assay the distribution of the various important functional groups in coals that determine the reactivity of coals. Other methods are being developed which will also determine how these functional groups are linked together. A third area of investigation concerns how molecular mobility in coals impacts NMR relaxation times, which is important for interpretation of such data in terms of the mobile phase in coals model. Along the same lines the authors are also using these studies to establish protocols for obtaining the best quantitative response from coals in solid state C-13 NMR spectra. The effects of very high MAS rates (>10 kHz) on cross polarization dynamics are also being investigated for similar reasons. The authors have concentrated on a theoretical treatment of pairs of tightly coupled spin {1/2} nuclei under magic angle spinning conditions. The average Hamiltonian theory developed here is required for a quantitative understanding of two dimensional NMR experiments of such spin pairs in solids. These experiments in turn provide a means of determining connectivities between resonances in solid state NMR spectra. Development of these techniques will allow us to establish connectivities between functional components in coals. The complete description of these spin dynamics has turned out to be complex, and is necessary to provide a foundation upon which such experiments may be quantitatively interpreted in complex mixtures such as coals. 25 refs., 4 figs., 3 tabs.

Zilm, K.W.

1990-01-01T23:59:59.000Z

350

Temperature effects on chemical structure and motion in coal. Final report  

SciTech Connect (OSTI)

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.

Maciel, G.E.

1996-09-30T23:59:59.000Z

351

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)

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.

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

352

Surfactant-assisted synthesis of hybrid lithium iron phosphate nanoparticles for enhancing electrochemical performance  

SciTech Connect (OSTI)

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.

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

353

Cyclization Phenomena in the Sol-Gel Polymerization of a,w-Bis(triethoxysilyl)alkanes and Incorporation of the Cyclic Structures into Network Silsesquioxane Polymers  

SciTech Connect (OSTI)

Intramolecular cyclizations during acid-catalyzed, sol-gel polymerizations of ct,co- bis(tietioxysilyl)aWmes substintidly lengtien gelties formonomers witietiylene- (l), propylene- (2), and butylene-(3)-bridging groups. These cyclizations reactions were found, using mass spectrometry and %i NMR spectroscopy, to lead preferentially to monomeric and dimeric products based on six and seven membered disilsesquioxane rings. 1,2- Bis(triethoxysilyl)ethane (1) reacts under acidic conditions to give a bicyclic drier (5) that is composed of two annelated seven membered rings. Under the same conditions, 1,3- bis(triethoxysilyl)propane (2), 1,4-bis(triethoxysilyl)butane (3), and z-1,4- bis(triethoxysilyl)but-2-ene (10) undergo an intramolecular condensation reaction to give the six membemd and seven membered cyclic disilsesquioxanes 6, 7, and 11. Subsequently, these cyclic monomers slowly react to form the tricyclic dirners 8,9 and 12. With NaOH as polymerization catalyst these cyclic silsesquioxanes readily ~aeted to afford gels that were shown by CP MAS z%i NMR and infr=d spectroscopes to retain some cyclic structures. Comparison of the porosity and microstructwe of xerogels prepared from the cyclic monomers 6 and 7 with gels prepared directly from their acyclic precursors 2 and 3, indicate that the final pore structure of the xerogels is markedly dependent on the nature of the precursor. In addition, despite the fact that the monomeric cyclic disilsesquioxane species can not be isolated from 1-3 under basic conditions due to their rapid rate of gelation, spectroscopic techniques also detected the presence of the cyclic structures in the resulting polymeric gels.

Alam, T.M.; Carpenter, J.P.; Dorhout, P.K.; Greaves, J.; Loy, D.A.; Shaltout, R.; Shea, K.J.; Small, J.H.

1999-01-04T23:59:59.000Z

354

Faint Radio Sources in the NOAO Bootes Field. VLBA Imaging and Optical Identifications  

E-Print Network [OSTI]

As a step toward investigating the parsec-scale properties of faint extragalactic radio sources, the Very Long Baseline Array (VLBA) was used at 5.0 GHz to obtain phase-referenced images of 76 sources in the NOAO Bootes field. These 76 sources were selected from the FIRST catalog to have peak flux densities above 10 mJy at 5 arcsec resolution and deconvolved major diameters of less than 3 arcsec at 1.4 GHz. Fifty-seven of these faint radio sources were identified with accretion-powered radio galaxies and quasars brighter than 25.5 mag in the optical I band. On VLA scales at 1.4 GHz, a measure of the compactness of the faint sources (the ratio of the peak flux density from FIRST to the integrated flux density from the NVSS catalog) spans the full range of possibilites arising from source-resolution effects. Thirty of the faint radio sources, or 39 +9/-7%, were detected with the VLBA at 5.0 GHz with peak flux densities above 6 sigma ~2 mJy at 2 mas resolution. The VLBA detections occur through the full range of compactness ratios. The stronger VLBA detections can themselves serve as phase-reference calibrators, boding well for opening up much of the radio sky to VLBA imaging. For the adopted cosmology, the VLBA resolution correponds to 17 pc or finer. Most VLBA detections are unresolved or slightly resolved but one is diffuse and five show either double or core-jet structures; the properties of these latter six are discussed in detail. Three VLBA detections are unidentified and fainter than 25.5 mag in the optical I band; their properties are highlighted because they likely mark optically-obscured active nuclei at high redshift.

J. M. Wrobel; G. B. Taylor; T. A. Rector; S. T. Myers; C. D. Fassnacht

2005-06-09T23:59:59.000Z

355

Heterogeneous Recycling in Fast Reactors  

SciTech Connect (OSTI)

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.

Dr. Benoit Forget; Michael Pope; Piet, Steven J.; Michael Driscoll

2012-07-30T23:59:59.000Z

356

Prospectively ECG-triggered high-pitch coronary angiography with third-generation dual-source CT at 70 kVp tube voltage: Feasibility, image quality, radiation dose, and effect of iterative reconstruction  

Science Journals Connector (OSTI)

AbstractBackground Low tube voltage reduces radiation exposure in coronary CT angiography (CTA). Using 70kVp tube potential has so far not been possible because CT systems were unable to provide sufficiently high tube current with low voltage. Objective We evaluated feasibility, image quality (IQ), and radiation dose of coronary CTA using a third-generation dual-source CT system capable of producing 450mAs tube current at 70 kVp tube voltage. Methods Coronary CTA was performed in 26 consecutive patients with suspected coronary artery disease, selected for body weight pitch spiral acquisition was used. Filtered back projection (FBP) and iterative reconstruction (IR)algorithms were applied. IQ was assessed using a 4-point rating scale (1= excellent, 4= nondiagnostic) and objective parameters. Results Mean age was 62 9years (46% males; mean body mass index, 27.7 3.8kg/m2; mean heart rate, 54 5 beats/min). Mean dose-length product was 20.6 1.9mGy cm; mean estimated effective radiation dose was 0.3 0.03mSv. Diagnostic IQ was found in 365 of 367 (FBP) and 366 of 367 (IR) segments (P nonsignificant). IQ was rated excellent in 53% (FBP) and 86% (IR) segments (P= .001) and nondiagnostic in 2 (FBP) and 1 segment (IR) (P nonsignificant). Mean IQ score was lesser in FBP vs IR (1.5 0.4 vs 1.1 0.2; P pitch spiral acquisition and 70 kVp tube voltage is feasible and provides both robust IQ and very low radiation exposure.

Michaela M. Hell; Daniel Bittner; Annika Schuhbaeck; Gerd Muschiol; Michael Brand; Michael Lell; Michael Uder; Stephan Achenbach; Mohamed Marwan

2014-01-01T23:59:59.000Z

357

On a recent preliminary study for the measurement of the Lense-Thirring effect with the Galileo satellites  

E-Print Network [OSTI]

It has been recently proposed to combine the node drifts of the future constellation of 27 Galileo spacecraft together with those of the existing LAGEOS-type satellites to improve the accuracy of the past and ongoing tests of the Lense-Thirring (LT) effect by removing the bias of a larger number of even zonal harmonics $J_{\\ell}$ than either done or planned so far. Actually, it seems a difficult goal to be realistically achieved for a number of reasons. First, the LT range signature of a Galileo-type satellite is as little as $0.5$ mm over 3-days arcs, corresponding to a node rate of just $\\dot\\Omega_{\\rm LT}=2$ milliarcseconds per year (mas yr$^{-1}$). Some tesseral and sectorial ocean tides such as $K_1,K_2$ induce long-period harmonic node perturbations with frequencies which are integer multiples of the extremely slow Galileo's node rate $\\dot\\Omega$ completing a full cycle in about 40 yr. Thus, over time spans $T$ of some years they would act as superimposed semi-secular aliasing trends. Since the coefficients of the $J_{\\ell}$-free multisatellite linear combinations are determined only by the semimajor axis $a$, the eccentricity $e$ and the inclination $I$, which are nominally equal for all the Galileo satellites, it is not possible to include all of them. Even by using only one Galileo spacecraft together with the LAGEOS family would be unfeasible because the resulting Galileo coefficient would be $\\gtrsim 1$, thus enhancing the aliasing impact of the uncancelled non-conservative and tidal perturbations.

Lorenzo Iorio

2013-11-24T23:59:59.000Z

358

N-15 NMR spectra of naturally abundant nitrogen in soil and aquatic natural organic matter samples of the International Humic Substances Society  

SciTech Connect (OSTI)

The naturally abundant nitrogen in soil and aquatic NOM samples from the International Humic Substances Society has been characterized by solid state CP/MAS ?N NMR. Soil samples include humic and fulvic acids from the Elliot soil, Minnesota Waskish peat and Florida Pahokee peat, as well as the Summit Hill soil humic acid and the Leonardite humic acid. Aquatic samples include Suwannee River humic, fulvic and reverse osmosis isolates, Nordic humic and fulvic acids and Pony Lake fulvic acid. Additionally, Nordic and Suwannee River XAD-4 acids and Suwannee River hydrophobic neutral fractions were analyzed. Similar to literature reports, amide/aminoquinone nitrogens comprised the major peaks in the solid state spectra of the soil humic and fulvic acids, along with heterocyclic and amino sugar/terminal amino acid nitrogens. Spectra of aquatic samples, including the XAD-4 acids, contain resolved heterocyclic nitrogen peaks in addition to the amide nitrogens. The spectrum of the nitrogen enriched, microbially derived Pony Lake, Antarctica fulvic acid, appeared to contain resonances in the region of pyrazine, imine and/or pyridine nitrogens, which have not been observed previously in soil or aquatic humic substances by ?N NMR. Liquid state ?N NMR experiments were also recorded on the Elliot soil humic acid and Pony Lake fulvic acid, both to examine the feasibility of the techniques, and to determine whether improvements in resolution over the solid state could be realized. For both samples, polarization transfer (DEPT) and indirect detection (H?N gHSQC) spectra revealed greater resolution among nitrogens directly bonded to protons. The amide/aminoquinone nitrogens could also be observed by direct detection experiments.

Thorn, Kevin A.; Cox, Larry G.

2009-02-28T23:59:59.000Z

359

Chemical Composition of Aquatic Dissolved Organic Matter in Five Boreal Forest Catchments Sampled in Spring and Fall Seasons  

SciTech Connect (OSTI)

The chemical composition and carbon isotope signature of aquatic dissolved organic matter (DOM) in five boreal forest catchments in Scandinavia were investigated. The DOM was isolated during spring and fall seasons using a reverse osmosis technique. The DOM samples were analyzed by elemental analysis, FT-IR, solid-state CP-MAS {sup 13}C-NMR, and C-1s NEXAFS spectroscopy. In addition, the relative abundance of carbon isotopes ({sup 12}C, {sup 13}C, {sup 14}C) in the samples was measured. There were no significant differences in the chemical composition or carbon isotope signature of the DOM sampled in spring and fall seasons. Also, differences in DOM composition between the five catchments were minor. Compared to reference peat fulvic and humic acids, all DOM samples were richer in O-alkyl carbon and contained less aromatic and phenolic carbon, as shown by FT-IR, {sup 13}C-NMR, and C-1s NEXAFS spectroscopy. The DOM was clearly enriched in {sup 14}C relative to the NBS oxalic acid standard of 1950, indicating that the aquatic DOM contained considerable amounts of organic carbon younger than about 50 years. The weight-based C:N ratios of 31 {+-} 6 and the {delta}{sup 13}Cvalues of -29 {+-} 2{per_thousand}indicate that the isolated DOM is of terrestrial rather than aquatic origin. We conclude that young, hydrophilic carbon compounds of terrestrial origin are predominant in the samples investigated, and that the composition of the aquatic DOM in the studied boreal forest catchments is rather stable during low to intermediate flow conditions.

Schumacher,M.; Christl, I.; Vogt, R.; Barmettler, K.; Jacobsen, C.; Kretzschmar, R.

2006-01-01T23:59:59.000Z

360

THE TRENDS HIGH-CONTRAST IMAGING SURVEY. III. A FAINT WHITE DWARF COMPANION ORBITING HD 114174  

SciTech Connect (OSTI)

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.

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

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361

Environmental restoration and waste management: An introduction. Student edition; Restauracion ambiental y administracion de residuos nucleares: Introduccion; Edicion estudiantil  

SciTech Connect (OSTI)

For more than 40 years, the United States has produced nuclear weapons. These production activities generated both radioactive and hazardous waste and often contaminated the environment. For many years, the public was unaware of the problem and unable to do anything about it. All of this has changed. In response to recent public outcry, the former Secretary of Energy, Retired Admiral James D. Watkins, established the Office of Environmental Restoration and Waste Management (EM) in November 1989. The creation of EM was the first step toward correcting contamination problems from the past 40 years In this booklet, we at DOE, through the efforts of the students at Oak Hills High School of Cincinnati, Ohio, will introduce you to EM and encourage your involvement in this major program within the Department of Energy. [Espanol] Durante mas de 40 anos, los Estados Unidos fabricaron armamentos nucleares. Esta produccion genero residuos radiactivos y peligrosos y, en muchos casos, contaminaron el medio ambiente. Durante mucho tiempo, el publico norteamericano no tenia conocimiento de este problema y no pudo hacer nada para solucionarlo. Todo esto ha cambiado. Respondiendo a crecientes protestas publicas, el ex Secretario de Energia Almirante James D. Watkins, establecio en noviembre de 1989 la Subsecretaria de Administracion Ambiental. La creacion de esta Subsecretaria fue el primer paso que dio el Departamento de Energia para corregir los problemas de contaminacion ambiental de los ultimos 40 anos. En esta publicacion, los que trabajamos en el Departamento de Energia con la ayuda de los estudiantes de la Escuela Secundaria de Oak Hills, Cincinnati, Ohio, te introduciermos a la administracion ambiental y alentamos tu participacion en este programa de fundamental importancia en el Departamento de Energia.

Not Available

1993-12-31T23:59:59.000Z

362

NEW CONSTRAINTS ON COMPANIONS AND DUST WITHIN A FEW AU OF VEGA  

SciTech Connect (OSTI)

We report on high contrast near-infrared ({approx}2.2 {mu}m) observations of Vega obtained with the Palomar Fiber Nuller, a dual sub-aperture rotating coronagraph installed at the Palomar Hale telescope. The data show consistent astrophysical null depth measurements at the {approx_equal} 10{sup -3} level or below for three different baseline orientations spanning 60 deg in azimuth, with individual 1{sigma} uncertainties {<=}7 x 10{sup -4}. These high cancellation and accuracy levels translate into a dynamic range greater than 1000:1 inside the diffraction limit of the 5 m telescope beam. Such high contrast performance is unprecedented in the near-infrared and provides improved constraints on Vega's immediate ({approx_equal}20 to 250 mas, or {approx_equal}0.15 to 2 AU) environment. In particular, our measurements rule out any potential companion in the [0.25-1 AU] region contributing more than 1% of the overall near-infrared stellar flux, with limits as low as 0.2% near 0.6 AU. These are the best upper limits established so far by direct detection for a companion to Vega in this inner region. We also conclude that any dust population contributing a significant ({>=}1%) near-infrared thermal excess can arise only within 0.2 AU of the star, and that it must consist of much smaller grains than in the solar zodiacal cloud. Dust emission from farther than {approx_equal}2 AU is also not ruled out by our observations, but would have to originate in strong scattering, pointing again to very small grains.

Mennesson, B.; Serabyn, E.; Martin, S. R.; Liewer, K.; Mawet, D. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099 (United States); Hanot, C., E-mail: bertrand.mennesson@jpl.nasa.gov [AEOS, University of Liege, Allee du 6 Aout, 17 Bat B5c, 4000 Liege (Belgium)

2011-07-20T23:59:59.000Z

363

High resolution radio observations of the colliding-wind binary WR140  

E-Print Network [OSTI]

Milli-arcsecond resolution Very Long Baseline Array (VLBA) observations of the archetype WR+O star colliding-wind binary (CWB) system WR140 are presented for 23 epochs between orbital phases 0.74 and 0.97. At 8.4 GHz, the emission in the wind-collision region (WCR) is clearly resolved as a bow-shaped arc that rotates as the orbit progresses. We interpret this rotation as due to the O star moving from SE to approximately E of the WR star, which leads to solutions for the orbit inclination of 122+/-5 deg, the longitude of the ascending node of 353+/-3 deg, and an orbit semi-major axis of 9.0+/-0.5 mas. The distance to WR140 is determined to be 1.85+/-0.16 kpc, which requires the O star to be a supergiant. The inclination implies the mass of the WR and O star to be 20+/-4 and 54+/-10 solar masses respectively. We determine a wind-momentum ratio of 0.22, with an expected half-opening angle for the WCR of 63 deg, consistent with 65+/-10 deg derived from the VLBA observations. Total flux measurements from Very Large Array (VLA) observations show the radio emission from WR140 is very closely the same from one orbit to the next, pointing strongly toward emission, absorption and cooling mechanism(s) that are controlled largely by the orbital motion. The synchrotron spectra evolve dramatically through the orbital phases observed, exhibiting both optically thin and optically thick emission. We discuss a number of absorption and cooling mechanisms that may determine the evolution of the synchrotron spectrum with orbital phase.

S. M. Dougherty; A. J. Beasley; M. J. Claussen; B. A. Zauderer; N. J. Bolingbroke

2005-01-18T23:59:59.000Z

364

Structural and thermal characterization of CaO-MgO-SiO2-P2O5-CaF2 glasses  

SciTech Connect (OSTI)

The paper presents the influence of varying CaO/MgO ratio on the structure and thermal properties of CaO-MgO-SiO2-P2O5-CaF2 glasses. A series of eight glass compositions in the glass forming region of diopside (CaMgSi2O6) - fluorapatite [Ca5(PO4)3F] - wollastonite (CaSiO3) ternary system have been designed and synthesized by varying diopside/wollastonite ratio in glasses. The as prepared melt-quenched glasses have been characterized for their structure by infrared spectroscopy (FTIR) and magic angle spinning (MAS)-nuclear magnetic resonance (NMR) spectroscopy. Silicon is predominantly present as Q2 (Si) species, while phosphorus tends to coordinate in orthophosphate environment in all the investigated glasses. The change in CaO/MgO ratio had an insignificant affect on the structure of glasses. The thermal sintering and crystallization parameters for the studied glasses have been obtained from differential thermal analysis (DTA) while crystalline phase fractions in the sintered glass-ceramics have been analyzed by X-ray diffraction adjoined with Rietveld refinement. Diopside, fluorapatite, wollastonite and pseudowollastonite have crystallized as the main crystalline phases in all the glass-ceramics with their content varying with respect to variation in CaO/MgO ratio in glasses. Scanning electron microscopy (SEM) has been used to shed light on the microstructure of glass-ceramics. The possible implications of structure and sintering behaviour of glasses on their bioactivity have been discussed.

Kansal, Ishu; Goel, Ashutosh; Tulyaganov, Dilshat U.; Rajagopal, Raghu R.; Ferreira, Jose M.

2012-08-01T23:59:59.000Z

365

Implications of CT noise and artifacts for quantitative {sup 99m}Tc SPECT/CT imaging  

SciTech Connect (OSTI)

Purpose: This paper evaluates the effects of computed tomography (CT) image noise and artifacts on quantitative single-photon emission computed-tomography (SPECT) imaging, with the aim of establishing an appropriate range of CT acquisition parameters for low-dose protocols with respect to accurate SPECT attenuation correction (AC). Methods: SPECT images of two geometric and one anthropomorphic phantom were reconstructed iteratively using CT scans acquired at a range of dose levels (CTDI{sub vol} = 0.4 to 46 mGy). Resultant SPECT image quality was evaluated by comparing mean signal, background noise, and artifacts to SPECT images reconstructed using the highest dose CT for AC. Noise injection was performed on linear-attenuation (?) maps to determine the CT noise threshold for accurate AC. Results: High levels of CT noise (? ? 200400 HU) resulted in low ?-maps noise (? ? 1%3%). Noise levels greater than ?10% in 140 keV ?-maps were required to produce visibly perceptible increases of ?15% in {sup 99m}Tc SPECT images. These noise levels would be achieved at low CT dose levels (CTDI{sub vol} = 4 ?Gy) that are over 2 orders of magnitude lower than the minimum dose for diagnostic CT scanners. CT noise could also lower (bias) the expected ? values. The relative error in reconstructed SPECT signal trended linearly with the relative shift in ?. SPECT signal was, on average, underestimated in regions corresponding with beam-hardening artifacts in CT images. Any process that has the potential to change the CT number of a region by ?100 HU (e.g., misregistration between CT images and SPECT images due to motion, the presence of contrast in CT images) could introduce errors in ?{sub 140} {sub keV} on the order of 10%, that in turn, could introduce errors on the order of ?10% into the reconstructed {sup 99m}Tc SPECT image. Conclusions: The impact of CT noise on SPECT noise was demonstrated to be negligible for clinically achievable CT parameters. Because CT dose levels that affect SPECT quantification is low (CTDI{sub vol} ? 4 ?Gy), the low dose limit for the CT exam as part of SPECT/CT will be guided by CT image quality requirements for anatomical localization and artifact reduction. A CT technique with higher kVp in combination with lower mAs is recommended when low-dose CT images are used for AC to minimize beam-hardening artifacts.

Hulme, K. W.; Kappadath, S. C., E-mail: skappadath@mdanderson.org [Department of Imaging Physics, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030 and The University of Texas Graduate School of Biomedical Sciences, Houston, Texas 77030 (United States)

2014-04-15T23:59:59.000Z

366

Proliferation Resistance Evaluation of ACR-1000 Fuel with Minor Actinides  

SciTech Connect (OSTI)

The Global Nuclear Energy Partnership (GNEP) program is to significantly advance the science and technology of nuclear energy systems and to enhance the spent fuel proliferation resistance. It consists of both innovative nuclear reactors and innovative research in separation and transmutation. The merits of nuclear energy are high-density energy, with low environmental impacts (i.e. almost zero greenhouse gas emission). Planned efforts involve near-term and intermediate-term improvements in fuel utilization and recycling in current light water reactors (LWRs) as well as the longer-term development of new nuclear energy systems that offer much improved fuel utilization and proliferation resistance, along with continued advances in operational safety. For future advanced nuclear systems, minor actinides (MA) are viewed more as a resource to be recycled, and transmuted to less hazardous and possibly more useful forms, rather than simply disposed of as a waste stream in an expensive repository facility. MAs can play a much larger part in the design of advanced systems and fuel cycles, not only as additional sources of useful energy, but also as direct contributors to the reactivity control of the systems into which they are incorporated. In this work, an Advanced CANDU Reactor (ACR) fuel unit lattice cell model with 43 UO2 fuel rods will be used to investigate the effectiveness of a Minor Actinide Reduction Approach (MARA) for enhancing proliferation resistance and improving the fuel cycle performance. The main MARA objective is to increase the 238Pu / Pu isotope ratio by using the transuranic nuclides (237Np and 241Am) in the high burnup fuel and thereby increase the proliferation resistance even for a very low fuel burnup. As a result, MARA is a very effective approach to enhance the proliferation resistance for the on power refueling ACR system nuclear fuel. The MA transmutation characteristics at different MA loadings were compared and their impact on neutronics criticality assessed. The concept of MARA, significantly increases the 238Pu/Pu ratio for proliferation resistance, as well as serves as a burnable absorber to hold-down the initial excess reactivity. It is believed that MARA can play an important role in atoms for peace and the intermediate term of nuclear energy reconnaissance

Gray S. Chang

2008-09-01T23:59:59.000Z

367

Comparison of blood flow models and acquisitions for quantitative myocardial perfusion estimation from dynamic CT  

Science Journals Connector (OSTI)

Myocardial blood flow (MBF) can be estimated from dynamic contrast enhanced (DCE) cardiac CT acquisitions, leading to quantitative assessment of regional perfusion. The need for low radiation dose and the lack of consensus on MBF estimation methods motivates this study to refine the selection of acquisition protocols and models for CT-derived MBF. DCE cardiac CT acquisitions were simulated for a range of flow states (MBF = 0.5, 1, 2, 3ml (min g)?1, cardiac output = 3, 5, 8 L min?1). Patient kinetics were generated by a mathematical model of iodine exchange incorporating numerous physiological features including heterogenenous microvascular flow, permeability and capillary contrast gradients. CT acquisitions were simulated for multiple realizations of realistic x-ray flux levels. CT acquisitions that reduce radiation exposure were implemented by varying both temporal sampling (1, 2, and 3s sampling intervals) and tube currents (140, 70, and 25 mAs). For all acquisitions, we compared three quantitative MBF estimation methods (two-compartment model, an axially-distributed model, and the adiabatic approximation to the tissue homogeneous model) and a qualitative slope-based method. In total, over 11000 time attenuation curves were used to evaluate MBF estimation in multiple patient and imaging scenarios. After iodine-based beam hardening correction, the slope method consistently underestimated flow by on average 47.5% and the quantitative models provided estimates with less than 6.5% average bias and increasing variance with increasing dose reductions. The three quantitative models performed equally well, offering estimates with essentially identical root mean squared error (RMSE) for matched acquisitions. MBF estimates using the qualitative slope method were inferior in terms of bias and RMSE compared to the quantitative methods. MBF estimate error was equal at matched dose reductions for all quantitative methods and range of techniques evaluated. This suggests that there is no particular advantage between quantitative estimation methods nor to performing dose reduction via tube current reduction compared to temporal sampling reduction. These data are important for optimizing implementation of cardiac dynamic CT in clinical practice and in prospective CT MBF trials.

Michael Bindschadler; Dimple Modgil; Kelley R Branch; Patrick J La Riviere; Adam M Alessio

2014-01-01T23:59:59.000Z

368

Assistant template and co-template agents in modeling mesoporous silicas and post-synthesizing organofunctionalizations  

SciTech Connect (OSTI)

Mesoporous SBA-16 silicas were synthesized through a direct methodology using the template (F127) combined with co-templates (ethanol and n-butanol), with tetraethylorthosilicate as the silica source. These ordered mesoporous silica were characterized by elemental analyses, infrared spectroscopy, solid-state nuclear magnetic resonance for {sup 13}C (CP/MAS) and {sup 29}Si (HP/DEC) nuclei, nitrogen sorption/desorption processes, small angle X-ray analyses (SAXS) and transmission electron microscopy (TEM). SAXS and TEM results confirmed the space group Im3m and cubic 3D symmetry, typical for highly ordered SBA-16. The sorption/desorption data for SBA-16 and when functionalized gave type IV isotherms, with hysteresis loop H2. Surface areas of 836; 657 and 618 m{sup 2} g{sup -1} and average pore diameters of 7.99; 8.10 and 9.85 nm, for SBA-16A, SBA-16B and SBA-16C were obtained, respectively. When functionalized the silicas presented a reduction in surface area, pore volume and pore diameter due to the pendant chains that interfere with nitrogen sorption in these measurements. The co-template ethanol favors the ordered mesopores with highest wall thicknesses. - Graphical Abstract: The mesoporous SBA-16 can be synthesized from binary (F127/TEOS) or ternary (F127/alcohol/TEOs) systems to give well-ordered mesoporous silicas. The co-templates ethanol or butanol gave the final material with highest wall thickness, mainly with ethanol. After these syntheses the pores were successfully organofunctionalized to give a good incorporation of the silylating agents. The final silicas presented of well-arranged solid characteristics as expressing by three distinct peaks, as indexed by the corresponding planes. Highlights: Black-Right-Pointing-Pointer Syntheses of mesoporous silicas by using ternary (F127/agent/TEOS) and binary (F127/TEOS) systems. Black-Right-Pointing-Pointer Use of co-templates to synthesize mesoporous silicas with larger wall thicknesses. Black-Right-Pointing-Pointer Immobilization of pendant chains inside the porous silicas. Black-Right-Pointing-Pointer Ordered mesoposous silicas as new materials for possible applications on sorption and delivering drug systems.

Oliveira, Vaeudo V. [Institute of Chemistry, University of Campinas, UNICAMP, PO Box 6154, 13084-971 Campinas, SP (Brazil)] [Institute of Chemistry, University of Campinas, UNICAMP, PO Box 6154, 13084-971 Campinas, SP (Brazil); Airoldi, Claudio, E-mail: airoldi@iqm.unicamp.br [Institute of Chemistry, University of Campinas, UNICAMP, PO Box 6154, 13084-971 Campinas, SP (Brazil)] [Institute of Chemistry, University of Campinas, UNICAMP, PO Box 6154, 13084-971 Campinas, SP (Brazil)

2012-12-15T23:59:59.000Z

369

Structural Investigations of Silica Polyamine Composites: Surface Coverage, Metal Ion Coordination, and Ligand Modification  

SciTech Connect (OSTI)

Silanization of the silica gel surface in the synthesis of silica gel polyamine composites uses (chloropropyl)-trichlorosilane (CPTCS). It is possible to substitute a molar fraction of reagent CPTCS with methyltrichlorosilane (MTCS), creating a mixed silane surface layer. Two types of silica gels were modified with a series of MTCS:CPTCS molar ratios. Solid-state CP/MAS 29Si and 13C NMR spectroscopies were used to evaluate the surface silane composition. Surface silane coverage was markedly improved for the resulting gels. When polyamines were grafted to the resultant MTCS:CPTCS silane layers, it was shown that the decrease in the number of propyl attachments to the polyamine resulted in increased quantities of ''free amines''. Optimum MTCS:CPTCS ratios were determined for three polyamines grafted onto one silica gel. A substantial free amine increase was observed for poly(allylamine) (PAA). Metal uptake studies show increases in Cu(II) capacity and/or an improvement in Cu(II) mass-transfer kinetics. The effect of polymer molecular weight upon Cu(II) capacity was investigated for each polyamine. Substantial differences in Cu(II) capacity between 50,000 MW poly(vinylamine) (PVA) and >1000 MW PVA were evident. Similar differences between 25,000 MW poly(ethyleneimine) (PEI) and 1200 MW PEI were found. The mass-transfer kinetics was shown to be improved for composites prepared using a large fraction of MTCS in the reagent silane mixture. This resulted in substantial improvements in the 10% breakthrough Cu(II) capacity for PVA (50 000 MW). PEI composites were further modified to form an amino-acetate ligand. The impact of the MTCS:CPTCS silane ratio on the acetate ligand loading and ultimately on the Cu(II) capacity at pH 2 was investigated. A ratio of 12.5:1 was shown to result in an acetate modified PEI composite with a Cu(II) capacity 140% of the Cu(II) capacity of the same composite prepared with ''CPTCS only''.

Hughes, Mark; Nielsen, Daniel; Rosenberg, Edward; Gobetto, Roberto; Viale, Alessandra; Burton, Sarah D.; Ferel, Joseph

2006-09-13T23:59:59.000Z

370

Enhancing BWR Proliferation Resistance Fuel with Minor Actinides  

SciTech Connect (OSTI)

Key aspects of the Global Nuclear Energy Partnership (GNEP) are to significantly advance the science and technology of nuclear energy systems and the Advanced Fuel Cycle (AFC) program. It consists of both innovative nuclear reactors and innovative research in separation and transmutation. To accomplish these goals, international cooperation is very important and public acceptance is crucial. The merits of nuclear energy are high-density energy, with low environmental impacts (i.e. almost zero greenhouse gas emission). Planned efforts involve near-term and intermediate-term improvements in fuel utilization and recycling in current light water reactors (LWRs) as well as the longer-term development of new nuclear energy systems that offer much improved fuel utilization and proliferation resistance, along with continued advances in operational safety. The challenges are solving the energy needs of the world, protection against nuclear proliferation, the problem of nuclear waste, and the global environmental problem. To reduce spent fuel for storage and enhance the proliferation resistance for the intermediate-term, there are two major approaches (a) increase the discharged spent fuel burnup in the advanced LWR (Gen-III Plus), which not only can reduce the spent fuel for storage, but also increase the 238Pu and 240Pu isotopes ratio to enhance the proliferation resistance, and (b) use of transuranic nuclides (237Np and 241Am) in the high burnup fuel, which can drastically increase the proliferation resistance isotope ratio of 238Pu /Pu. For future advanced nuclear systems, the minor actinides (MA) are viewed more as a resource to be recycled, or transmuted to less hazardous and possibly more useful forms, rather than simply as a waste stream to be disposed of in expensive repository facilities. As a result, MAs play a much larger part in the design of advanced systems and fuel cycles, not only as additional sources of useful energy, but also as direct contributors to the reactivity control of the systems into which they are incorporated. In the study, a typical boiling water reactor (BWR) fuel unit lattice cell model with UO2 fuel pins will be used to investigate the effectiveness of minor actinide reduction approach (MARA) for enhancing proliferation resistance and improving the fuel cycle performance in the intermediate term goal for future nuclear energy systems. To account for the water coolant density variation from the bottom (0.76 g/cm3) to the top (0.35 g/cm3) of the core, the axial coolant channel and fuel pin were divided to 24 nodes. The MA transmutation characteristics at different elevations were compared and their impact on neutronics criticality discussed. We concluded that the concept of MARA, which involves the use of transuranic nuclides (237Np and/or 241Am), significantly increases the 238Pu/Pu ratio for proliferation resistance, as well as serves as a burnable absorber to hold-down the initial excess reactivity. It is believed that MARA can play an important role in atoms for peace and the intermediate term of nuclear energy rennaissance.

Gray S. Chang

2008-07-01T23:59:59.000Z

371

Development of a dynamic quality assurance testing protocol for multisite clinical trial DCE-CT accreditation  

SciTech Connect (OSTI)

Purpose: Credentialing can have an impact on whether or not a clinical trial produces useful quality data that is comparable between various institutions and scanners. With the recent increase of dynamic contrast enhanced-computed tomography (DCE-CT) usage as a companion biomarker in clinical trials, effective quality assurance, and control methods are required to ensure there is minimal deviation in the results between different scanners and protocols at various institutions. This paper attempts to address this problem by utilizing a dynamic flow imaging phantom to develop and evaluate a DCE-CT quality assurance (QA) protocol.Methods: A previously designed flow phantom, capable of producing predictable and reproducible time concentration curves from contrast injection was fully validated and then utilized to design a DCE-CT QA protocol. The QA protocol involved a set of quantitative metrics including injected and total mass error, as well as goodness of fit comparison to the known truth concentration curves. An additional region of interest (ROI) sensitivity analysis was also developed to provide additional details on intrascanner variability and determine appropriate ROI sizes for quantitative analysis. Both the QA protocol and ROI sensitivity analysis were utilized to test variations in DCE-CT results using different imaging parameters (tube voltage and current) as well as alternate reconstruction methods and imaging techniques. The developed QA protocol and ROI sensitivity analysis was then applied at three institutions that were part of clinical trial involving DCE-CT and results were compared.Results: The inherent specificity of robustness of the phantom was determined through calculation of the total intraday variability and determined to be less than 2.2 1.1% (total calculated output contrast mass error) with a goodness of fit (R{sup 2}) of greater than 0.99 0.0035 (n= 10). The DCE-CT QA protocol was capable of detecting significant deviations from the expected phantom result when scanning at low mAs and low kVp in terms of quantitative metrics (Injected Mass Error 15.4%), goodness of fit (R{sup 2}) of 0.91, and ROI sensitivity (increase in minimum input function ROI radius by 146 86%). These tests also confirmed that the ASIR reconstruction process was beneficial in reducing noise without substantially increasing partial volume effects and that vendor specific modes (e.g., axial shuttle) did not significantly affect the phantom results. The phantom and QA protocol were finally able to quickly (<90 min) and successfully validate the DCE-CT imaging protocol utilized at the three separate institutions of a multicenter clinical trial; thereby enhancing the confidence in the patient data collected.Conclusions: A DCE QA protocol was developed that, in combination with a dynamic multimodality flow phantom, allows the intrascanner variability to be separated from other sources of variability such as the impact of injection protocol and ROI selection. This provides a valuable resource that can be utilized at various clinical trial institutions to test conformance with imaging protocols and accuracy requirements as well as ensure that the scanners are performing as expected for dynamic scans.

Driscoll, B. [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada)] [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada); Keller, H. [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9, Canada and Department of Radiation Oncology, University of Toronto, 150 College Street, Toronto, Ontario M5S 3E2 (Canada)] [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9, Canada and Department of Radiation Oncology, University of Toronto, 150 College Street, Toronto, Ontario M5S 3E2 (Canada); Jaffray, D.; Coolens, C. [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada) [Department of Radiation Physics, Princess Margaret Cancer Center, 610 University Avenue, Toronto, Ontario M5G 2M9 (Canada); Department of Radiation Oncology, University of Toronto, 150 College Street, Toronto, Ontario M5S 3E2 (Canada); Techna Institute, University Health Network, 124-100 College Street, Toronto, Ontario M5G 1L5 (Canada)

2013-08-15T23:59:59.000Z

372

Dynamic volume vs respiratory correlated 4DCT for motion assessment in radiation therapy simulation  

SciTech Connect (OSTI)

Purpose: Conventional (i.e., respiratory-correlated) 4DCT exploits the repetitive nature of breathing to provide an estimate of motion; however, it has limitations due to binning artifacts and irregular breathing in actual patient breathing patterns. The aim of this work was to evaluate the accuracy and image quality of a dynamic volume, CT approach (4D{sub vol}) using a 320-slice CT scanner to minimize these limitations, wherein entire image volumes are acquired dynamically without couch movement. This will be compared to the conventional respiratory-correlated 4DCT approach (RCCT). Methods: 4D{sub vol} CT was performed and characterized on an in-house, programmable respiratory motion phantom containing multiple geometric and morphological ''tumor'' objects over a range of regular and irregular patient breathing traces obtained from 3D fluoroscopy and compared to RCCT. The accuracy of volumetric capture and breathing displacement were evaluated and compared with the ground truth values and with the results reported using RCCT. A motion model was investigated to validate the number of motion samples needed to obtain accurate motion probability density functions (PDF). The impact of 4D image quality on this accuracy was then investigated. Dose measurements using volumetric and conventional scan techniques were also performed and compared. Results: Both conventional and dynamic volume 4DCT methods were capable of estimating the programmed displacement of sinusoidal motion, but patient breathing is known to not be regular, and obvious differences were seen for realistic, irregular motion. The mean RCCT amplitude error averaged at 4 mm (max. 7.8 mm) whereas the 4D{sub vol} CT error stayed below 0.5 mm. Similarly, the average absolute volume error was lower with 4D{sub vol} CT. Under irregular breathing, the 4D{sub vol} CT method provides a close description of the motion PDF (cross-correlation 0.99) and is able to track each object, whereas the RCCT method results in a significantly different PDF from the ground truth, especially for smaller tumors (cross-correlation ranging between 0.04 and 0.69). For the protocols studied, the dose measurements were higher in the 4D{sub vol} CT method (40%), but it was shown that significant mAs reductions can be achieved by a factor of 4-5 while maintaining image quality and accuracy. Conclusions: 4D{sub vol} CT using a scanner with a large cone-angle is a promising alternative for improving the accuracy with which respiration-induced motion can be characterized, particularly for patients with irregular breathing motion. This approach also generates 4DCT image data with a reduced total scan time compared to a RCCT scan, without the need for image binning or external respiration signals within the 16 cm scan length. Scan dose can be made comparable to RCCT by optimization of the scan parameters. In addition, it provides the possibility of measuring breathing motion for more than one breathing cycle to assess stability and obtain a more accurate motion PDF, which is currently not feasible with the conventional RCCT approach.

Coolens, Catherine; Bracken, John; Driscoll, Brandon; Hope, Andrew; Jaffray, David [Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario M5G 2M9, Canada and Department of Radiation Oncology, University of Toronto, Toronto, Ontario M5S 3S2 (Canada); Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario M5G 2M9 (Canada); Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario M5G 2M9, Canada and Department of Radiation Oncology, University of Toronto, Toronto, Ontario M5S 3S2 (Canada); Radiation Medicine Program, Princess Margaret Hospital, Toronto, Ontario M5G 2M9 (Canada); Department of Radiation Oncology, University of Toronto, Toronto, Ontario M5S 3S2 (Canada) and Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 2M9 (Canada)

2012-05-15T23:59:59.000Z

373

Effects of exposure equalization on image signal-to-noise ratios in digital mammography: A simulation study with an anthropomorphic breast phantom  

SciTech Connect (OSTI)

Purpose: The scan equalization digital mammography (SEDM) technique combines slot scanning and exposure equalization to improve low-contrast performance of digital mammography in dense tissue areas. In this study, full-field digital mammography (FFDM) images of an anthropomorphic breast phantom acquired with an anti-scatter grid at various exposure levels were superimposed to simulate SEDM images and investigate the improvement of low-contrast performance as quantified by primary signal-to-noise ratios (PSNRs). Methods: We imaged an anthropomorphic breast phantom (Gammex 169 ''Rachel,'' Gammex RMI, Middleton, WI) at various exposure levels using a FFDM system (Senographe 2000D, GE Medical Systems, Milwaukee, WI). The exposure equalization factors were computed based on a standard FFDM image acquired in the automatic exposure control (AEC) mode. The equalized image was simulated and constructed by superimposing a selected set of FFDM images acquired at 2, 1, 1/2, 1/4, 1/8, 1/16, and 1/32 times of exposure levels to the standard AEC timed technique (125 mAs) using the equalization factors computed for each region. Finally, the equalized image was renormalized regionally with the exposure equalization factors to result in an appearance similar to that with standard digital mammography. Two sets of FFDM images were acquired to allow for two identically, but independently, formed equalized images to be subtracted from each other to estimate the noise levels. Similarly, two identically but independently acquired standard FFDM images were subtracted to estimate the noise levels. Corrections were applied to remove the excess system noise accumulated during image superimposition in forming the equalized image. PSNRs over the compressed area of breast phantom were computed and used to quantitatively study the effects of exposure equalization on low-contrast performance in digital mammography. Results: We found that the highest achievable PSNR improvement factor was 1.89 for the anthropomorphic breast phantom used in this study. The overall PSNRs were measured to be 79.6 for the FFDM imaging and 107.6 for the simulated SEDM imaging on average in the compressed area of breast phantom, resulting in an average improvement of PSNR by {approx}35% with exposure equalization. We also found that the PSNRs appeared to be largely uniform with exposure equalization, and the standard deviations of PSNRs were estimated to be 10.3 and 7.9 for the FFDM imaging and the simulated SEDM imaging, respectively. The average glandular dose for SEDM was estimated to be 212.5 mrad, {approx}34% lower than that of standard AEC-timed FFDM (323.8 mrad) as a result of exposure equalization for the entire breast phantom. Conclusions: Exposure equalization was found to substantially improve image PSNRs in dense tissue regions and result in more uniform image PSNRs. This improvement may lead to better low-contrast performance in detecting and visualizing soft tissue masses and micro-calcifications in dense tissue areas for breast imaging tasks.

Liu Xinming; Lai Chaojen; Whitman, Gary J.; Geiser, William R.; Shen Youtao; Yi Ying; Shaw, Chris C. [Department of Imaging Physics, University of Texas MD Anderson Cancer Center, Houston, Texas 77030-4009 (United States); Department of Diagnostic Radiology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030-4009 (United States); Department of Imaging Physics, University of Texas MD Anderson Cancer Center, Houston, Texas 77030-4009 (United States)

2011-12-15T23:59:59.000Z