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1

Energy-dependent relative charge transfer cross sections of Cs+ + Rb(5s, 5p)  

E-Print Network (OSTI)

Magneto optical trap recoil ion momentum spectroscopy is used to measure energy-dependent charge exchange cross sections in the Cs+ + Rb(5s, 5p) system over a range of projectile energies from 3.2 to 6.4 keV. The measurements are kinematically complete and yield cross sections that are differential in collision energy, scattering angle, and initial and final states.

Nguyen, H; Fléchard, X; DePaola, B D

2013-01-01T23:59:59.000Z

2

Laser-induced damage investigation at 1064 nmin KTiOPO4 crystals and its analogy with RbTiOPO4  

SciTech Connect

Bulk laser-induced damage at 1064 nm has been investigated in KTiOPO4 (KTP) and RbTiOPO4 (RTP) crystals with a nanosecond pulsed Nd:YAG laser. Both crystals belong to the same family. Throughout this study, their comparison shows a very similar laser-damage behavior. The evolution of the damage resistance under a high number of shots per site (10,000 shots) reveals a fatigue effect of KTP and RTP crystals. In addition, S-on-1 damage probability curves have been measured in both crystals for all combinations of polarization and propagation direction aligned with the principal axes of the crystals. The results show an influence of the polarization on the laser-induced damage threshold (LIDT), with a significantly higher threshold along the z axis, whereas no effect of the propagation direction has been observed. This LIDT anisotropy is discussed with regard to the crystallographic structure.

Hildenbrand, A.; Wagner, F. R.; Akhouayri, H.; Natoli, J.-Y.; Commandre, M.; Theodore, F.; Albrecht, H.

2009-07-20T23:59:59.000Z

3

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)  

Science Conference Proceedings (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

4

Improving CS regulations.  

Science Conference Proceedings (OSTI)

President Carter issued Executive Order 12044 (3/28/78) that required all Federal agencies to distinguish between significant and insignificant regulations, and to determine whether a regulation will result in major impacts. This study gathered information on the impact of the order and the guidelines on the Office of Conservation and Solar Energy (CS) regulatory practices, investigated problems encountered by the CS staff when implementing the order and guidelines, and recommended solutions to resolve these problems. Major tasks accomplished and discussed are: (1) legislation, Executive Orders, and DOE Memoranda concerning Federal administrative procedures relevant to the development and analysis of regulations within CS reviewed; (2) relevant DOE Orders and Memoranda analyzed and key DOE and CS staff interviewed in order to accurately describe the current CS regulatory process; (3) DOE staff from the Office of the General Counsel, the Office of Policy and Evaluation, the Office of the Environment, and the Office of the Secretary interviewed to explore issues and problems encountered with current CS regulatory practices; (4) the regulatory processes at five other Federal agencies reviewed in order to see how other agencies have approached the regulatory process, dealt with specific regulatory problems, and responded to the Executive Order; and (5) based on the results of the preceding four tasks, recommendations for potential solutions to the CS regulatory problems developed. (MCW)

Nesse, R.J.; Scheer, R.M.; Marasco, A.L.; Furey, R.

1980-10-01T23:59:59.000Z

5

Cs-Se (Cesium - Selenium)  

Science Conference Proceedings (OSTI)

Cs-Se crystallographic data...Cs-Se crystallographic data Phase Composition, wt% Se Pearson symbol Space group (Cs) 0 cI 2 Im m Cs 2 Se 22.9 oP 12 Pnma Cs 3 Se 2 28 â?¦ â?¦ Cs 5 Se 4 32.2 â?¦ â?¦ CsSe 37.3 â?¦ â?¦ Cs 2 Se 3 47 oC 20 Cmc 2 1 Cs 2 Se 5 59.7 oP 28 P 2 1 2 1 2 1 (Se) 100 hP 3 P 3 1 2 1 High-pressure phase Cs 2 Se 22.9 oF 24 Fdd 2...

6

CS267: NERSC User Blog  

NLE Websites -- All DOE Office Websites (Extended Search)

Computers Discussion CS267: NERSC Discussion This area is intended for NERSC users and staff to help each other with questions about CS267. Post your comment Posting comments...

7

CRITICALITY SAFETY (CS)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Objective CS.1 - A criticality safety program is established, sufficient numbers of qualified personnel are provided, and adequate facilities and equipment are available to ensure criticality safety support services are adequate for safe operations. (Core Requirements 1, 2, and 6) Criteria * Functions, assignments, responsibilities, and reporting relationships are clearly defined, understood, and effectively implemented. * Operations support personnel for the criticality safety area are adequately staffed and trained. Approach Record Review: Review the documentation that establishes the Criticality Safety Requirements (CSRs) for appropriateness and completeness. Review for adequacy and completion the criticality safety personnel training records that indicate training on facility procedures and systems under

8

CRITICALITY SAFETY (CS)  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

OBJECTIVE CS.1 The LANL criticality safety program provides the required technical guidance and oversight capabilities to ensure a comprehensive criticality safety program for the storage of nuclear materials in SSTs. (Core Requirements 3, 4, 8) Criteria * The Criticality Safety Program is an administrative TSR and meets the General and * Specific Requirements of DOE O 420.1A, Section 4.3 Nuclear Criticality Safety. * All processes and operations involving significant quantities of fissile materials are * described in current procedures approved by line management. * Procedures contain approved criticality controls and limits, based on HSR-6 evaluations and recommendations. * Supervisors, operations personnel, and criticality safety officers have received

9

08/28/2012! CS4230! CS4230 Parallel Programming  

E-Print Network (OSTI)

Supercomputer 08/28/2012! CS4230! 22! Peak performance of 2.33 Petaflops 224,256 AMD Opteron cores http://www.olcf

Hall, Mary W.

10

Quasicontinuum relativistic many-body perturbation theory photoionization cross sections of Na, K, Rb, and Cs  

SciTech Connect

Calculations of photoionization cross sections for alkali-metal atoms are carried out in the framework of relativistic many-body perturbation theory (RMBPT) using quasicontinuum B-spline orbitals. All third-order terms are included, in contrast to previous calculations based on either random-phase approximation (RPA), Brueckner orbitals, or their combination. The particular advantage of quasicontinuum states is that high-order MBPT codes do not require modification for applications to the photoionization problem. The agreement with experiment is improved compared to RPA and Dirac-Hartree-Fock approximations. The results also exhibit close form invariance. The presented formalism can be extended to other photoionizing transitions.

Savukov, I. M. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2007-09-15T23:59:59.000Z

11

FREE ZONE Rb-276 Chiller Monitoring Project  

Science Conference Proceedings (OSTI)

Regulations prohibiting the production of chlorofluorocarbons (CFCs) have spurred the development of alternative refrigerants with similar thermodynamic properties and operating characteristics for use in large chiller systems. This study evaluates refrigerant FREE ZONE RB-276, a "drop in" replacement for R-12, which has been out of production since January 1, 1996.

1999-11-16T23:59:59.000Z

12

Magnetic dipole sequences in {sup 83}Rb  

SciTech Connect

High-spin states in {sup 83}Rb were populated in the reaction {sup 11}B+{sup 76}Ge at beam energies of 45 and 50 MeV. {gamma} rays were detected with the spectrometer GASP. The level scheme of {sup 83}Rb was extended up to 13.9 MeV. Mean lifetimes of 23 levels were determined using the Doppler-shift-attenuation method. Among the bands newly established is a sequence comprising intense M1 transitions and crossover E2 transitions. This sequence turns out to be irregular and thus shows that magnetic rotation as observed in the neighboring odd-odd isotopes is not realized in this odd-even nuclide. Excited states in {sup 83}Rb were interpreted in terms of the shell model using the model space {pi}(0f{sub 5/2},1p{sub 3/2},1p{sub 1/2},0g{sub 9/2}) {nu}(1p{sub 1/2},0g{sub 9/2}). The configurations predicted for the negative-parity M1 sequence reproduce the M1 transition strengths fairly well.

Schwengner, R.; Schnare, H.; Wagner, A.; Doenau, F. [Institut fuer Strahlenphysik, Forschungszentrum Dresden-Rossendorf, D-01314 Dresden (Germany); Rainovski, G. [Faculty of Physics, University of Sofia, BG-1164 Sofia (Bulgaria); Frauendorf, S. [Institut fuer Strahlenphysik, Forschungszentrum Dresden-Rossendorf, D-01314 Dresden (Germany); Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States); Jungclaus, A. [Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, E-28006 Madrid (Spain); Hausmann, M.; Lieb, K. P. [II. Physikalisches Institut, Universitaet Goettingen, D-37073 Goettingen (Germany); Yordanov, O. [Institute for Nuclear Research and Nuclear Energy, BAS, BG-1784 Sofia (Bulgaria); Napoli, D. R.; De Angelis, G.; Axiotis, M. [INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Italy); Marginean, N. [Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, P. O. Box MG-6 (Romania); Brandolini, F.; Alvarez, C. Rossi [INFN and Dipartimento di Fisica dell'Universita di Padova, I-35131 Padova (Italy)

2009-10-15T23:59:59.000Z

13

Rb-Sr Geochronologic Investigation Of Precambrian Samples From...  

Open Energy Info (EERE)

Of Precambrian Samples From Deep Geothermal Drill Holes, Fenton Hill, New Mexico Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Rb-Sr...

14

Bidders with Hard Valuation Problems Kate Larson KLARSON@CS.CMU.EDU  

E-Print Network (OSTI)

Bidders with Hard Valuation Problems Kate Larson KLARSON@CS.CMU.EDU Tuomas Sandholm SANDHOLM. After time D the agent must stop. This is exactly the situation where agents have hard deadlines. Since i(t) be the set i(t) = {i(t)|t = n i=1 ti}. As mentioned earlier, the descriptive part

Chen, Yiling

15

Ts&Cs FP  

NLE Websites -- All DOE Office Websites (Extended Search)

6/14/11 6/14/11 Page 1 of 17 Printed copies of this document are uncontrolled. Retrieve latest version electronically. SANDIA CORPORATION SF 6432-FP (06/14/11) Section II STANDARD TERMS AND CONDITIONS FOR FIRM-FIXED PRICE CONTRACTS THE FOLLOWING CLAUSES APPLY TO THIS CONTRACT AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE COVER PAGE OR SECTION I. FP01 - ACCEPTANCE OF TERMS AND CONDITIONS (Ts&Cs) Contractor, by signing this contract and/or delivering items or services ordered under this contract, agrees to comply with all the Ts&Cs and all specifications and other documents that this contract incorporated by reference or attachment. Sandia hereby objects to any Ts&Cs contained in any acknowledgment of this contract

16

Another look at CS0  

Science Conference Proceedings (OSTI)

This paper describes the goals and methods of a new kind of CS0 course and explains why it is being used as the introductory course for an Information Science Major. Information Science is a new discipline that has been distinguished from Computer Science, ...

William Mitchell

2001-10-01T23:59:59.000Z

17

PHYSiCS LAbORATORY  

Science Conference Proceedings (OSTI)

Page 1. PHYSiCS LAbORATORY Supporting US Industry, Government, and the Scientific Community by Providing Measurement ...

2010-09-08T23:59:59.000Z

18

SF6432-CS Commercial Services  

NLE Websites -- All DOE Office Websites (Extended Search)

7/31/13 7/31/13 Page 1 of 18 Printed copies of this document are uncontrolled. Retrieve latest version electronically. SANDIA CORPORATION SF 6432-CS (07/2013) SECTION II STANDARD TERMS AND CONDITIONS FOR COMMERCIAL SERVICES THE FOLLOWING CLAUSES APPLY TO THIS CONTRACT AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE COVER PAGE OR SECTION I. (CTRL+CLICK ON A LINK BELOW TO ADVANCE DIRECTLY TO THAT SECTION) ACCEPTANCE OF TERMS AND CONDITIONS (Ts&Cs) APPLICABLE LAW ASSIGNMENT BANKRUPTCY CANCELLATION OR TERMINATION FOR CONVENIENCE CHANGES COMPLIANCE WITH LAWS DEFINITIONS DISPUTES EXCUSABLE DELAYS EXPORT CONTROL ORDER OF PRECEDENCE PAYMENT PERFORMANCE EVALUATION PROGRAM

19

ITER CS Intermodule Support Structure  

Science Conference Proceedings (OSTI)

With five independently driven, bi-polarity power supplies, the modules of the ITER central solenoid (CS) can be energized in aligned or opposing field directions. This sets up the possibility for repelling modules, which indeed occurs, particularly between CS2L and CS3L around the End of Burn (EOB) time point. Light interface compression between these two modules at EOB and wide variations in these coil currents throughout the pulse produce a tendency for relative motion or slip. Ideally, the slip is purely radial as the modules breathe without any accumulative translational motion. In reality, however, asymmetries such as nonuniformity in intermodule friction, lateral loads from a plasma Vertical Disruption Event (VDE), magnetic forces from manufacturing and assembly tolerances, and earthquakes can all contribute to a combination of radial and lateral module motion. This paper presents 2D and 3D, nonlinear, ANSYS models which simulate these various asymmetries and determine the lateral forces which must be carried by the intermodule structure. Summing all of these asymmetric force contributions leads to a design-basis lateral load which is used in the design of various support concepts: the CS-CDR centering rings and a variation, the 2001 FDR baseline radial keys, and interlocking castles structures. Radial key-type intermodule structure interface slip and stresses are tracked through multiple 15 MA scenario current pulses to demonstrate stable motion following the first few cycles. Detractions and benefits of each candidate intermodule structure are discussed, leading to the simplest and most robust configuration which meets the design requirements: match-drilled radial holes and pin-shaped keys.

Myatt, R. [Myatt Consulting, Norfolk, MA; Freudenberg, Kevin D [ORNL

2011-01-01T23:59:59.000Z

20

A New Rb Lamp Exciter Circuit for Rb atomic clocks and Studies on Transition from Ring to Red mode  

E-Print Network (OSTI)

In this paper we describe the development of novel RF exciter circuit for electrode less Rb lamp. The lamp exciter circuit is a RF oscillator with a a new configuration operating at 60 to 65 MHz frequency with 3 to 4 watt power. The Rb lamp is used in exciting the ground state hyperfine transitions in Rb atom in a glass cell placed inside a tuned microwave cavity, As the frequency of these hyperfine transitions is very stable it is used in the development of Rb atomic clock by phase locking the oven controlled crystal oscillator (OCXO) to this atomic transition frequency. The details of the Rb lamp exciter are presented in the paper.The Lamp is ideally operated in ring mode as in this mode the linewidth is narrow and there is no self reversal. However, high temperature and RF excitation power may drive the Rb lamp to red mode which gives rise to line broadening and self reversal. It is the experience that mode change from ring to red deteriorates the atomic signal strength and S/N. In this paper the reasons of mode change are also discussed.

Savita Singh; Bikash Ghosal; G M Saxena

2010-11-10T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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

Ts&Cs FP  

NLE Websites -- All DOE Office Websites (Extended Search)

0-09) Title: Standard Terms and Conditions for 0-09) Title: Standard Terms and Conditions for Firm-Fixed Price Contracts Owner: Procurement Policy & Quality Dept Initial Release Date: 10/22/09 Page 1 of 16 PPQD-TMPLT-008R00 Template Release Date: 06/12/09 Printed copies of this document are uncontrolled. Before using a printed copy to perform work, verify the version against the electronic document to ensure you are using the correct version. SANDIA CORPORATION SF 6432-FP (10-09) Section II STANDARD TERMS AND CONDITIONS FOR FIRM-FIXED PRICE CONTRACTS THE FOLLOWING CLAUSES APPLY TO THIS CONTRACT AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE COVER PAGE OR SECTION I. FP01 - ACCEPTANCE OF TERMS AND CONDITIONS (Ts&Cs) Contractor, by

22

ARM STM Plenary: CS Report  

NLE Websites -- All DOE Office Websites (Extended Search)

8 8 ARM Science Team Meeting 2008 Warren Wiscombe ARM Chief Scientist Brookhaven National Lab Mar 2008 ARM Plenary 2 ARM Chief Scientist Team ARM Chief Scientist Team Ric Cederwall Andy Vogelmann Sharon Zuhoski Yangang Liu Pavlos Kollias Mar 2008 ARM Plenary 3 Submit your... Submit your... science highlights (www.arm.gov) poster PDFs (esp if you win CS Design Award) feedback in text boxes on ARM web pages Also... vote for People's Choice Poster talk to our Thu morning speakers Mar 2008 ARM Plenary 4 Mar 2008 ARM Plenary 5 Existing Existing * CLOWD (Clouds with Low Optical Depth) * BBHRP (BroadBand Heating Rate Profile) * Radar Focus Groups Focus Groups New New * Vertical Velocity for Climate Modelers * Longwave/Microwave * Surface Fluxes Mar 2008 ARM Plenary 6 ARM ARM ' ' s s two fundamental science questions

23

pRb's role in cell fate, lineage commitment, and tumorigenesis  

E-Print Network (OSTI)

The product of the retinoblastoma gene, pRB, was the first known and cloned tumor suppressor gene and it is functionally inactivated in most human cancers. pRB is thought to suppresses tumorigenesis by restraining cellular ...

Calo-Velázquez, Eliezer

2011-01-01T23:59:59.000Z

24

Potential value of Cs-137 capsules  

Science Conference Proceedings (OSTI)

We determined the value of Cs-137 compared to Co-60 as a source for the irradiation of fruit (apples and cherries), pork and medical supplies. Cs-137, in the WESF capsule form, had a value of approximately $0.40/Ci as a substitute for Co-60 priced at approximately $1.00/Ci. The comparison was based on the available curies emitted from the surface of each capsule. We developed preliminary designs for fourteen irradiation facilities; seven were based on Co-60 and seven were based on Cs-137. These designs provided the basis for estimating capital and operating costs which, in turn, provided the basis for determining the value of Cs-137 relative to Co-60 in these applications. We evaluated the effect of the size of the irradiation facility on the value of Cs-137. The cost of irradiation is low compared to the value of the product. Irradiation of apples for disinfestation costs $.01 to .02 per pound. Irradiation for trichina-safe pork costs $.02 per pound. Irradiation of medical supplies for sterilization costs $.07 to .12 per pound. The cost of the irradiation source, either Co-60 or Cs-137, contributed only a minor amount to the total cost of irradiation, about 5% for the fruit and hog cases and about 20% for the medical supply cases. We analyzed the sensitivity of the irradiation costs and Cs-137 value to several key assumptions.

Bloomster, C.H.; Brown, D.R.; Bruno, G.A.; Hazelton, R.F.; Hendrickson, P.L.; Lezberg, A.J.; Tingey, G.L.; Wilfert, G.L.

1985-04-01T23:59:59.000Z

25

Ti Plasmid  

NLE Websites -- All DOE Office Websites (Extended Search)

Ti Plasmid Ti Plasmid Name: Dixenia Location: N/A Country: N/A Date: N/A Question: What can you tell me about the Ti Plasmid? Replies: This plasmid is named for a plasmid found in a bacteria called Agrobacter tumefaciens. It causes "plant cancer" or what are known as galls. They are little tumors in which the bacteria can grow and live in the plant. Ti stands for tumor inducing. The bacterium gets into the plant through some kind of wound, ie. a scratch. It injects its plasmid into a plant cell and the plasmid inserts its DNA into the plant's DNA. Then the DNA directs the plant to make a hollow tumor where the bacteria can live. Scientists have taken advantage of this plant's ability to insert foreign DNA into a plant. They take the genes out of the plasmid that cause galls, and insert genes of interest, ie. genes for pest resistance and let the plasmid carry those genes into the plant. The plant will start making the product you want. You may have seen a picture of a tobacco plant glowing because firefly genes for glowing were inserted into the plant. They did this so they could know if the gene had made it into the plant. Once they are sure the gene they want has made it into the plant, they clone the plant cells. By the way, plant tissue culture is a procedure that is very common and has been done for years, this is not the same as cloning animals.

26

Rb-Sr Geochronologic Investigation Of Precambrian Samples From Deep  

Open Energy Info (EERE)

Rb-Sr Geochronologic Investigation Of Precambrian Samples From Deep Rb-Sr Geochronologic Investigation Of Precambrian Samples From Deep Geothermal Drill Holes, Fenton Hill, New Mexico Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Rb-Sr Geochronologic Investigation Of Precambrian Samples From Deep Geothermal Drill Holes, Fenton Hill, New Mexico Details Activities (2) Areas (1) Regions (0) Abstract: Analyses of twenty-six gneissic whole rocks from the depth range 732-2588 m in drill hole GT-2 yield a 1.62 ± 0.04 b.y. isochron age with initial 86Sr/86Sr (Ro) = 0.7067 ± 0.0014; this age is in agreement with radiometric ages reported for rocks elsewhere in north-central New Mexico. A preliminary isochron age of 1.92 ± 0.18 b.y. with Ro = 7014 ± 0.0025 from the nearby drill hole GT-1 is defined by eight samples. Because these

27

Virtualizing office hours in CS 50  

Science Conference Proceedings (OSTI)

In Fall 2007, we introduced "virtual office hours" into Harvard College's introductory computer science course, CS 50, so that students could meet with teaching fellows (TFs) online to discuss problem sets at any hour from anywhere. Our goals were to ... Keywords: CSCW, collaboration, distance education, virtual office hours

David J. Malan

2009-07-01T23:59:59.000Z

28

Learning adobe photoshop cs6, First edition  

Science Conference Proceedings (OSTI)

In this Adobe Photoshop CS6 video training course expert author and trainer Andy Anderson introduces you to the basics of this graphics software from Adobe. Photoshop is a huge and complex program, but Andy breaks it down into bite sized pieces that ...

Andy Anderson

2012-05-01T23:59:59.000Z

29

Project Rio Blanco reentry drilling and testing of RB-E-01 well. Final report  

SciTech Connect

Reentry by the RB-E-01 hole was made through the 7-in. emplacement casing. Details of the drilling operations and test results are presented. (TFD)

1975-10-01T23:59:59.000Z

30

CS 314, LS,LTM: L1: Introduction 1 CS 314 Principles ofCS 314 Principles of  

E-Print Network (OSTI)

314, LS,LTM: L1: Introduction 3 BookBook · Michael L. Scott, Programming Language Pragmatics, 3rd an algorithm ­ you don't "say" a program, you design and construct it (but you don't say an essay or a novel edition #12;CS 314, LS,LTM: L1: Introduction 4 WorkWork · 2 Midterms · Final · 4 (?) projects · Homework

Steinberg, Louis

31

CS Wind Tech Co Ltd | Open Energy Information  

Open Energy Info (EERE)

CS Wind Tech Co Ltd CS Wind Tech Co Ltd Jump to: navigation, search Name CS Wind Tech Co Ltd Place Lianyungang, China Zip 222049 Sector Wind energy Product China-based wind turbine tower maker, a subsidiary of Korea's CS Corporation. References CS Wind Tech Co Ltd[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. CS Wind Tech Co Ltd is a company located in Lianyungang, China . References ↑ "CS Wind Tech Co Ltd" Retrieved from "http://en.openei.org/w/index.php?title=CS_Wind_Tech_Co_Ltd&oldid=343989" Categories: Clean Energy Organizations Companies Organizations Stubs What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load)

32

Applications of Parallel Computers Lectures for UCB CS267 Course  

NLE Websites -- All DOE Office Websites (Extended Search)

Computers Applications of Parallel Computers UCB CS267 Spring 2013 Tuesday & Thursday, 9:30-11:00 Pacific Time Applications of Parallel Computers, CS267, is a graduate-level course...

33

Ancestor worship in CS1: on the primacy of arrays  

Science Conference Proceedings (OSTI)

History has given us the array as the fundamental data structure to present to students within the CS1 curriculum. However, with the recent growth in popularity of object-oriented languages for CS1 (C++, Java, C#), and with that, the acceptance of the ... Keywords: CS1, arrays, curriculum, data structures, object oriented-design, object-oriented programming, objects-first

Phil Ventura; Christopher Egert; Adrienne Decker

2004-10-01T23:59:59.000Z

34

Electron sources utilizing thin CsBr coatings  

Science Conference Proceedings (OSTI)

We present experimental results obtained in solid Cu targets coated with ~18nm thick CsBr films operating in a reflection mode. The results indicate a factor of 50X increase in quantum efficiency relative to uncoated Cu samples. The CsBr/Cu samples are ... Keywords: Alkali halides, CsBr, Electron sources, Free electron lasers, Multi electron beam tools, Photocathodes

Juan R. Maldonado; Zhi Liu; D. H. Dowell; Robert E. Kirby; Yun Sun; Piero Pianetta; Fabian Pease

2009-04-01T23:59:59.000Z

35

SPAcENoCs : A Scalable Platform for FPGA Accelerated Emulator of NoCs  

E-Print Network (OSTI)

The majority of modern high performance computing systems have employed on-chip multi-processors. As the number of on-chip cores soars, the traditional non- scalable communication infrastructures, commonly observed as shared buses or cross- bars, no longer accommodate the increasing communication demand by the modern multi-core chips. The newly emerging Network-On-Chip (NoC) interconnection scheme has provided a scalable, robust and power-efficient solution that also satisfies the requirements on both bandwidth and latency. A tool that enables swift exploration of the vast NoC design space is then in great demand to meet the stiff time pressure over research and development. Based on the work of AcENoCs, an NoC simulator designed on the basis of software and hardware codesign seeking for a large simulatable network size, the SPAcENoCs (Scalable Platform for FPGA Accelerated Emulator of NoCs) employs the Time-Division Multiplexing (TDM) techniques to implement a simulator for even larger NoCs without sacrificing simulation speed and cycle accuracy which have been highlighted in the work of AcENoCs. This paper will focus on re-organization of the given software/hardware codesigned frameworks so that the TDM techniques may be applied. While both frameworks require re-design, the major efforts involve re- construction of the hardware framework by adding data buffers and affiliated logic to ensure the data generated in different time divisions are properly preserved and trans- mitted. Various design tradeoffs over hardware budget and simulation performance are also discussed and attempted in this paper. During the development process, the techniques of device virtualization and generic programming are introduced to overcome the verification challenges that are commonly seen in software/hardware codesigned systems. The synthesis results of various design options suggested that the simulation of a 9 × 6 network, more than twice the size of largest applicable size in AcENoCs, can be accommodated by the device. Based on the simulation result of AcENoCs, the estimated speedup of SPAcENoCs over software simulator for the 9 × 6 NoC is around 28-94X, twice the one achieved by AcENoCs in a smaller network.

Chen, Guangming

2013-05-01T23:59:59.000Z

36

Blackbody radiation shift in 87Rb frequency standard  

E-Print Network (OSTI)

The operation of atomic clocks is generally carried out at room temperature, whereas the definition of the second refers to the clock transition in an atom at absolute zero. This implies that the clock transition frequency should be corrected in practice for the effect of finite temperature of which the leading contributor is the blackbody radiation (BBR) shift. Experimental measurements of the BBR shifts are difficult. In this work, we have calculated the blackbody radiation shift of the ground-state hyperfine microwave transition in 87Rb using the relativistic all-order method and carried out detailed evaluation of the accuracy of our final value. Particular care is taken to accurately account for the contributions from highly-excited states. Our predicted value for the Stark coefficient, k_S=-1.240(4)\\times 10^{-10}\\text{Hz/(V/m)}^{2} is three times more accurate than the previous calculation [1].

M. S. Safronova; Dansha Jiang; U. I. Safronova

2010-07-03T23:59:59.000Z

37

Enhanced frequency up-conversion in Rb vapor  

E-Print Network (OSTI)

We demonstrate highly efficient generation of coherent 420 nm light via up-conversion of near-infrared lasers in a hot rubidium vapor cell. By optimizing pump polarizations and frequencies we achieve a single-pass conversion efficiency of 260%/W, significantly higher than in previous experiments. A full 2D exploration of the coherent light generation and fluorescence as a function of the pump frequencies reveals that coherent blue light is generated at 85Rb two-photon resonances, as predicted by theory, but at high vapor pressure it is suppressed in spectral regions that don't support phase matching or exhibit single-photon Kerr refraction. Favorable scaling of our current 1 mW blue beam power with additional pump power is predicted. Infrared pump polarization could be used for future intensity switching experiments.

Vernier, A; Riis, E; Arnold, A S

2009-01-01T23:59:59.000Z

38

Nonlinear magneto-optic effects in optically dense Rb vapor  

E-Print Network (OSTI)

Nonlinear magneto-optical effects, originated from atomic coherence, are studied both theoretically and experimentally in thermal Rb vapor. The analytical description of the fundamental properties of coherent media are based on the simplified three- and four-level systems, and then verified using numerical simulations and experimental measurements. In particular, we analyze the modification of the long-lived atomic coherence due to various physical effects, such as reabsorption of spontaneous radiation, collisions with a buffer gas atoms, etc. We also discuss the importance of the high-order nonlinearities in the description of the polarization rotation for the elliptically polarized light. The effect of self-rotation of the elliptical polarization is also analyzed. Practical applications of nonlinear magneto-optical effects are considered in precision metrology and magnetometery, and for the generation of non-classical states of electromagnetic field.

Novikova, Irina Borisovna

2006-05-01T23:59:59.000Z

39

A Remotely Interrogated All-Optical $^{87}$Rb Magnetometer  

E-Print Network (OSTI)

Atomic magnetometry was performed at Earth's magnetic field over a free-space distance of ten meters. Two laser beams aimed at a distant alkali-vapor cell excited and detected the $^{87}$Rb magnetic resonance, allowing the magnetic field within the cell to be interrogated remotely. Operated as a driven oscillator, the magnetometer measured the geomagnetic field with \\lessgtrsim{\\lesssim}3.5\\,pT precision in a $\\sim$2\\,s data acquisition; this precision was likely limited by ambient field fluctuations. The sensor was also operated in self-oscillating mode with a 5.3\\,pT/$\\sqrt{\\textrm{Hz}}$ noise floor. Further optimization will yield a high-bandwidth, fully remote magnetometer with sub-pT sensitivity.

Brian Patton; Oscar Versolato; D. Chris Hovde; Eric Corsini; James Higbie; Dmitry Budker

2012-08-06T23:59:59.000Z

40

Conditions for spin squeezing in a cold 87Rb ensemble  

E-Print Network (OSTI)

We study the conditions for generating spin squeezing via a quantum non-demolition measurement in an ensemble of cold 87Rb atoms. By considering the interaction of atoms in the 5S_{1/2}(F=1) ground state with probe light tuned near the D2 transition, we show that, for large detunings, this system is equivalent to a spin-1/2 system when suitable Zeeman substates and quantum operators are used to define a pseudo-spin. The degree of squeezing is derived for the rubidium system in the presence of scattering causing decoherence and loss. We describe how the system can decohere and lose atoms, and predict as much as 75% spin squeezing for atomic densities typical of optical dipole traps.

D'Echaniz, S R; Kubasik, M; Koschorreck, M; Crepaz, H; Eschner, J; Polzik, E S

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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

Conditions for spin squeezing in a cold 87Rb ensemble  

E-Print Network (OSTI)

We study the conditions for generating spin squeezing via a quantum non-demolition measurement in an ensemble of cold 87Rb atoms. By considering the interaction of atoms in the 5S_{1/2}(F=1) ground state with probe light tuned near the D2 transition, we show that, for large detunings, this system is equivalent to a spin-1/2 system when suitable Zeeman substates and quantum operators are used to define a pseudo-spin. The degree of squeezing is derived for the rubidium system in the presence of scattering causing decoherence and loss. We describe how the system can decohere and lose atoms, and predict as much as 75% spin squeezing for atomic densities typical of optical dipole traps.

S. R. de Echaniz; M. W. Mitchell; M. Kubasik; M. Koschorreck; H. Crepaz; J. Eschner; E. S. Polzik

2005-06-10T23:59:59.000Z

42

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

EA-365 Centre Land EA-365 Centre Land Trading Limited Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-365 Centre Land Trading Limited Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): Application from Centre Land Trading Limited to export electric energy to Canada EA- 365 Centre Land Trading Limited More Documents & Publications Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-367 EDF Trading North America, LLC (EDF) Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): OE Docket EA-364 Noble Americas Gas & Power Corporation

43

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3 Noble Americas Gas 3 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-363 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): Noble Americas Gas & Power Corporation to export electric energy to Mexico EA-363 Noble Americas Gas & Power Corporation More Documents & Publications Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): OE Docket EA-364 Noble Americas Gas & Power Corporation EA-363 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity

44

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

8 Brookfield Energy 8 Brookfield Energy Marketing LP Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-368 Brookfield Energy Marketing LP Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): Application from Brookfield Energy Marketing LP to export electric energy to CanadaA EA-368 Brookfield Energy Marketing LP More Documents & Publications Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): OE Docket EA-364 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-365 Centre Land Trading Limited

45

Record of Categorical Exclusion (CS) Determination, Office of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

(OE): American Recovery and Reinvestment Act of 2009 (Recovery Act) Smart Grid Investment Grant Program (EISA 1306) Record of Categorical Exclusion (CS) Determination, Office...

46

Generation of continuous-wave and pulsed squeezed light with $^{87}$Rb vapor  

E-Print Network (OSTI)

We present experimental studies on the generation of squeezed vacuum via nonlinear ellipse rotation in a $^{87}$Rb vapor. Squeezing is observed for a wide range of input powers and pump detunings on the D1 line, while only excess noise is present on the D2 line. The maximum squeezing observed is -1.4 $\\pm$0.1 dB (-2.0 dB corrected for loss). We measure -1.1 dB squeezing at the resonance frequency of the $^{85}$Rb $F=2 \\to F'=3$ transition, which may allow the storage of squeezed light generated by $^{87}$Rb in a $^{85}$Rb quantum memory. We also demonstrate a proof of principle pulsed squeezed light experiment, with -1 dB of squeezing for 200 ns pulse width.

Agha, Imad H; Grangier, Philippe

2009-01-01T23:59:59.000Z

47

Generation of pulsed and continuous-wave squeezed light with $^{87}$Rb vapor  

E-Print Network (OSTI)

We present experimental studies on the generation of pulsed and continuous-wave squeezed vacuum via nonlinear rotation of the polarization ellipse in a $^{87}$Rb vapor. Squeezing is observed for a wide range of input powers and pump detunings on the D1 line, while only excess noise is present on the D2 line. The maximum continuous-wave squeezing observed is -$ 1.4 \\pm0.1$ dB (-2.0 dB corrected for losses). We measure -1.1 dB squeezing at the resonance frequency of the $^{85}$Rb $F=3 \\to F'$ transition, which may allow the storage of squeezed light generated by $^{87}$Rb in a $^{85}$Rb quantum memory. Using a pulsed pump, pulsed squeezed light with -1 dB of squeezing for 200 ns pulse widths is observed at 1 MHz repetition rate.

Imad H. Agha; Gaétan Messin; Philippe Grangier

2009-11-15T23:59:59.000Z

48

Precise Measurement of Strontium-82 Radioactivity in the Sr-Rb...  

Office of Science (SC) Website

at the imaging facility by extracting it from an 82Sr-82Rb generator. Much as a battery is used to store electricity, the radioactive 82Sr with its long 25.35 days half-life...

49

Magnetic Properties of RB66 (R = Gd, Tb, Ho, Er, and Lu)  

SciTech Connect

We report magnetic susceptibility measurements of RB66 (R = Gd, Tb, Ho, Er, and Lu) boron-rich rare earth containing borides down to 50 mK. The data suggest a spin glass low temperature state for RB66 (R = Gd, Tb, Ho, and Er) with the freezing temperatures below 1 K. The magnetic properties appear to be influenced by the anisotropy of the magnetic moments, probably via the crystalline electric field effects.

Kim, Hyunsoo; Budko, Serguei; ATanatar, Makariy; Avdashchenko, D.V.; Matovnikov, A.V.; Mitroshenkov, N.V.; Novikov, V.V.; Prozorov, Ruslan

2012-05-17T23:59:59.000Z

50

ARIES-CS COIL STRUCTURE ADVANCED FABRICATION APPROACH  

E-Print Network (OSTI)

: ARIES-CS, advanced fabrication, additive manufacturing Note: Some figures in this paper are in color. A new fabrication technology4,5 was evaluated on ARIES-CS that is called additive manufacturing. Additive manufacturing, a relatively new manufac- turing process, appears to be a better fabrication method

51

ARIES-CS MAGNET CONDUCTOR AND STRUCTURE EVALUATION  

E-Print Network (OSTI)

treatment!. Because of the additive manufacturing method for the structure inARIES-CS, described by Waganer coil structure. For ARIES-CS, additive manufacturing10 is the fab- rication method chosen implications on cost and manufacturing requirements. Concepts with both con- ventional and advanced

California at San Diego, University of

52

NERSC/DOE FES Requirements Workshop Worksheet - CS Chang  

NLE Websites -- All DOE Office Websites (Extended Search)

CS Chang CS Chang CS Chang FES Requirements Worksheet 1.1. Project Information - Center for Plasma Edge Simulation Document Prepared By CS Chang Project Title Center for Plasma Edge Simulation Principal Investigator CS Chang Participating Organizations New York University, ORNL, PPPL, LBNL, MIT, Columbia U., Rutgers U. Lehigh U., Georgia Tech, Auburn U., U. Colorado, U. California at Irvine, Caltech, Hinton Associates Funding Agencies DOE SC DOE NSA NSF NOAA NIH Other: 2. Project Summary & Scientific Objectives for the Next 5 Years Please give a brief description of your project - highlighting its computational aspect - and outline its scientific objectives for the next 3-5 years. Please list one or two specific goals you hope to reach in 5 years. Develop the XGC large scale edge kinetic codes further for higher fidelity

53

DOE _Final_ DOE - Enclosure 5 to 2005 CS 647b Report - hum…...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

5 to 2005 CS 647b Report - hum&8230;&0; DOE Final DOE - Enclosure 5 to 2005 CS 647b Report - hum&8230;&0; DOE Final DOE - Enclosure 5 to 2005 CS 647b Report -...

54

Collimated Blue and Infrared Beams Generated by Two-Photon Excitation in Rb Vapor  

E-Print Network (OSTI)

Utilizing two-photon excitation in hot Rb vapor we demonstrate the generation of collimated optical fields at 420 nm and 1324 nm. Input laser beams at 780 nm and 776 nm enter a heated Rb vapor cell collinear and circularly polarized, driving Rb atoms to the $5D_{5/2}$ state. Under phase-matching conditions coherence among the $5S_{1/2}\\rightarrow 5P_{3/2}\\rightarrow 5D_{5/2} \\rightarrow 6P_{3/2}$ transitions produces a blue (420 nm) beam by four-wave mixing. We also observe a forward and backward propagating IR (1324 nm) beam, due to cascading decays through the $6S_{1/2}\\rightarrow 5P_{1/2}$ states. Power saturation of the generated beams is investigated by scaling the input powers to greater than 200 mW, resulting in a coherent blue beam of 9.1 mW power, almost an order of magnitude larger than previously achieved. We measure the dependences of both beams in relation to the Rb density, the frequency detuning between Rb ground state hyperfine levels, and the input laser intensities.

Sell, J F; DePaola, B D; Knize, R J

2013-01-01T23:59:59.000Z

55

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

OE Docket EA-364 Noble OE Docket EA-364 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): OE Docket EA-364 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): Application from Noble Americas Gas & Power Corporation to export electric energy to Canada Application to Export Electric Energy OE Docket EA-364 Noble Americas Gas & Power Corporation More Documents & Publications EA-364 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-367 EDF Trading North America, LLC

56

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Program Direction Program Direction Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): American Recovery and Reinvestment Act of 2009 (Recovery Act) Program Direction Based on OE's review of the information concerning the proposal action, the NEPA compliance Officer has determined that the proposed action fits within the specified class of action, other regulatory requirements set forth are met, and proposed action is hereby categorically excluded from further NEPA review. Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): American Recovery and Reinvestment Act of 2009 (Recovery Act) Program Direction More Documents & Publications Record of Categorical Exclusion (CS) Determination, Office of Electricity

57

Microsoft PowerPoint - EnergyCS Altair Nano Prius PHEVs Fleet...  

NLE Websites -- All DOE Office Websites (Extended Search)

North American PHEV Demonstration North American PHEV Demonstration Fleet Summary Report: EnergyCS Prius (Altairnano pack) Number of Vehicles: 2 (EnergyCS Data Loggers) Reporting...

58

EnergyCS Inc Energy Control Systems Engineering Inc | Open Energy...  

Open Energy Info (EERE)

EnergyCS Inc Energy Control Systems Engineering Inc Jump to: navigation, search Name EnergyCS Inc (Energy Control Systems Engineering, Inc) Sector Services Product String...

59

Microsoft PowerPoint - EnergyCS Valence Prius PHEVs Fleet report...  

NLE Websites -- All DOE Office Websites (Extended Search)

Activity North American PHEV Demonstration Fleet Summary Report:- EnergyCS Prius (Valance pack) Number of Vehicles: 5 (EnergyCS Data Logger) Reporting Period: 2008 Summary *...

60

Latent Inhibition of US Signal Value Following CS-US Training  

E-Print Network (OSTI)

followed magazine training. In Group LI, one food pellet wasValue Following CS-US Training Murray J. Goddard Universitystimulus (CS) - US training. Results from Experiment 2

Goddard, Murray J.

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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.


61

Precise Measurement of Strontium-82 Radioactivity in the Sr-Rb PET  

Office of Science (SC) Website

Precise Measurement of Strontium-82 Precise Measurement of Strontium-82 Radioactivity in the Sr-Rb PET Generator Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Spinoff Applications Spinoff Archives SBIR/STTR Applications of Nuclear Science and Technology Funding Opportunities Nuclear Science Advisory Committee (NSAC) News & Resources Contact Information Nuclear Physics U.S. Department of Energy SC-26/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3613 F: (301) 903-3833 E: sc.np@science.doe.gov More Information » Spinoff Archives Precise Measurement of Strontium-82 Radioactivity in the Sr-Rb PET Generator Print Text Size: A A A RSS Feeds FeedbackShare Page Application/instrumentation: Precise measurement of 82Sr radioactivity in the Sr-Rb PET generatorm

62

The insulin-RB synapse in health and disease: cellular rocket science  

E-Print Network (OSTI)

Time has come for a survey of our knowledge on the physical interaction between the growth-promoting insulin molecule and retinoblastoma tumor suppressor protein (RB). Theoretical and experimental observations over the past 15 years reviewed here indicate that the insulin-RB dimer may represent an essential molecular crossroads involved in major physiological and pathological conditions. Within this system, the putative tumor suppressor insulin-degrading enzyme (IDE) should be an important modulator. Perhaps most remarkably, the abstraction of this encounter between insulin and RB, two growth-regulatory giants acting either in concert or against each other depending on the respective cellular requirements, reveals that Nature may compute in controlling cell fate and we could follow in its footsteps towards developing more efficient therapeutics as well as novel technical devices.

Razvan Tudor Radulescu

2007-11-01T23:59:59.000Z

63

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

7 EDF Trading North 7 EDF Trading North America, LLC (EDF) Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-367 EDF Trading North America, LLC (EDF) Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): Application of EDF Trading North America, LLC (EDF) to export electric energy to Canada EA-367 EDF Trading North America, LLC (EDF) More Documents & Publications EA-367 EDF Trading North America, LLC Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): OE Docket EA-364 Noble Americas Gas & Power Corporation Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): EA-365 Centre Land Trading Limited

64

Microsoft PowerPoint - Energy CS Prius Accel Testing Results...  

NLE Websites -- All DOE Office Websites (Extended Search)

2008 and the final results can be found in the table to the right. The Energy CS Prius averaged 66.1 mpg over the 5,596 miles of testing (5,440-mile goal). Based on an...

65

Ordering circuit establishment in multiplane NoCs  

Science Conference Proceedings (OSTI)

Segregating networks-on-chips (NoCs) into data and control planes yields several opportunities for improving power and performance in chip-multiprocessor systems (CMPs). This article describes a hybrid packet/circuit switched multiplane network optimized ...

Ahmed Abousamra, Alex K. Jones, Rami Melhem

2013-10-01T23:59:59.000Z

66

Real World Adobe Illustrator CS5, 1st edition  

Science Conference Proceedings (OSTI)

Real World Adobe Illustrator CS5 is the definitive reference to Adobe's industry-standard vector graphics software. With an easy, engaging style, author and past Illustrator product manager Mordy Golding takes readers through all of the features of the ...

Mordy Golding

2010-07-01T23:59:59.000Z

67

VUV Detector Calibrations - CsTe Photodiode Description  

Science Conference Proceedings (OSTI)

... telluride (CsTe) photodetectors with magnesium fluoride (MgF 2 ) windows are issued by ... telluride film is deposited onto a MgF 2 window and then ...

2011-12-30T23:59:59.000Z

68

NMR Study in the Iron-Selenide Rb0:74Fe1:6Se2: Determination of the Superconducting Phase as Iron Vacancy-Free Rb0:3Fe2Se2  

E-Print Network (OSTI)

NMR Study in the Iron-Selenide Rb0:74Fe1:6Se2: Determination of the Superconducting Phase as Iron magnetic resonance (NMR) experiments on Rb0:74Fe1:6Se2 reveal clearly distinct spectra originating from a majority antiferromagnetic (AF) and a minority metallic-superconducting (SC) phase. The very narrow NMR

Paris-Sud 11, Université de

69

Neutron Fluences and Radiation Damage Parameters for the HFIR-MFE-RB-17J Experiment  

Science Conference Proceedings (OSTI)

The HFIR-MFE-RB-17J experiment was conducted in the removable beryllium (RB) position of HFIR with a Eu2O2 shield. The irradiation was conducted from April 27, 2004, to May 18, 2005. The total exposure was for 353.6 FPD (full power days). Reactor dosimetry capsules were analyzed and the activation data were used to provide the best estimates of the neutron fluences and radiation damage parameters as a function of height relative to midplane of the reactor.

Greenwood, Lawrence R.; Glasgow, David C.; Baldwin, Charles A.

2010-06-30T23:59:59.000Z

70

Neutron Fluences and Radiation Damage Parameters for the HFIR-MFE-RB-14J Experiment  

Science Conference Proceedings (OSTI)

The HFIR-MFE-RB-14J experiment was conducted in the unshielded removable beryllium (RB) position of HFIR. The irradiation of the assembly occurred for two separated time periods. The first irradiation was from June 3, 1999 to August 27, 1999. The second irradiation period was from January 27, 2000 until June 6, 2000. The total exposure was for 14293 FPD (full power days). Reactor dosimetry capsules were analyzed and the activation data were used to provide the best estimates of the neutron fluences and radiation damage parameters as a function of height relative to midplane of the reactor.

Greenwood, Lawrence R.; Glasgow, David C.; Baldwin, Charles A.

2010-08-23T23:59:59.000Z

71

Neutron Fluences and Radiation Damage Parameters for the HFIR-MFE-RB-17J Experiment  

Science Conference Proceedings (OSTI)

The HFIR-MFE-RB-17J experiment was conducted in the removable beryllium (RB) position of HFIR with a Eu2O2 shield. The irradiation was conducted from April 27, 2004, to May 18, 2005. The total exposure was for 353.6 FPD (full power days). Reactor dosimetry capsules were analyzed and the activation data were used to provide the best estimates of the neutron fluences and radiation damage parameters as a function of height relative to midplane of the reactor.

Greenwood, Lawrence R.; Glasgow, David C.; Baldwin, Charles A.

2010-08-23T23:59:59.000Z

72

Neutron Fluences and Radiation Damage Parameters for the HFIR-MFE-RB-14J Experiment  

Science Conference Proceedings (OSTI)

The HFIR-MFE-RB-14J experiment was conducted in the unshielded removable beryllium (RB) position of HFIR. The irradiation of the assembly occurred for two separated time periods. The first irradiation was from June 3, 1999 to August 27, 1999. The second irradiation was from January 27, 2000 until June 6, 2000. The total exposure was for 14293 FPD (full power days). Reactor dosimetry capsules were analyzed and the activation data were used to provide the best estimates of the neutron fluences and radiation damage parameters as a function of height relative to midplane of the reactor.

Greenwood, Lawrence R.; Glasgow, David C.; Baldwin, Charles A.

2010-06-30T23:59:59.000Z

73

/sup 137/Cs radioactive dating of Lake Ontario sediment cores  

SciTech Connect

The distribution of /sup 137/Cs in sediment cores from Lake Ontario provides estimates of the sediment accumulation rates. Geochronology with /sup 210/Pb dating and distribution of Ambrosia (ragweed) pollen compare well with /sup 137/Cs dating. These methods can determine with precision, changes in sedimentation occurring over the past 100 years or so. Typical sedimentation rates of 0.18-0.36 cm/yr were measured. 16 refs., 3 figs., 2 tabs.

Ward, T.E.; Breeden, J.; Komisarcik, K.; Porter, R.; Czuczwa, J.; Kaminski, R.; McVeety, B.D.

1987-12-01T23:59:59.000Z

74

The Transfer of Dissolved Cs-137 from Soil to Plants  

SciTech Connect

Rapidly maturing plants were grown simultaneously at the same experimental sites under natural conditions at the Chernobyl Exclusion Zone. Roots of the plants were side by side in the soil. During two seasons we selected samples of the plants and of the soils several times every season. Content of Cs-137 in the plant and in the soil solution extracted from the samples of soils was measured. Results of measurements of the samples show that, for the experimental site, Cs-137 content in the plant varies with date of the sample selection. The plant:soil solution Cs-137 concentration ratio depends strongly on the date of selection and also on the type of soil. After analysis of the data we conclude that Cs-137 plant uptake is approximately proportional to the content of dissolved Cs-137 in the soil per unit of volume, and the plant:soil solution Cs-137 concentration ratio for the soil is approximately proportional to the soil moisture. (authors)

Prorok, V.V.; Melnichenko, L.Yu. [Department of Physics, Taras Shevchenko National University of Kyiv, 2, build. 1 Acad. Glushkov prospect, Kyiv-680 MSP (Ukraine); Mason, C.F.V. [Research Applications Corporation, 148 Piedra Loop, Los Alamos, NM 87544 (United States); Ageyev, V.A.; Ostashko, V.V. [Institute for Nuclear Research, 47 Nauky prospect, Kyiv-680 MSP (Ukraine)

2006-07-01T23:59:59.000Z

75

Identification of the slow E3 transition 136mCs -> 136Cs with conversion electrons  

E-Print Network (OSTI)

We performed at ISOLDE the spectroscopy of the decay of the 8- isomer in 136Cs by and conversion-electron detection. For the first time the excitation energy of the isomer and the multipolarity of its decay have been measured. The half-life of the isomeric state was remeasured to T1/2 = 17.5(2) s. This isomer decays via a very slow 518 keV E3 transition to the ground state. In addition to this, a much weaker decay branch via a 413 keV M4 and a subsequent 105 keV E2 transition has been found. Thus we have found a new level at 105 keV with spin 4+ between the isomeric and the ground state. The results are discussed in comparison to shell model calculations.

K. Wimmer; U. Koester; P. Hoff; Th. Kroell; R. Kruecken; R. Lutter; H. Mach; Th. Morgan; S. Sarkar; M. Saha Sarkar; W. Schwerdtfeger; P. C. Srivastava; P. G. Thirolf; P. Van Isacker

2011-06-30T23:59:59.000Z

76

Electron induced surface chemistry at the Cs/sapphire interface  

DOE Green Energy (OSTI)

Electron induced etching of sapphire in the presence of Cs has been studied using a variety of surface analytical techniques. We find that this process occurs on both the (0001) and (1102) orientations of sapphire. Monolayer amounts of Al and sub-oxides of Al are thermally desorbed from the surface at temperatures as low as 1000 K when the surface is irradiated with electrons in the presence of Cs. Etching is highly dependent on Cs coverage with the (0001) and (1102) surfaces requiring 2.0 {times} 10{sup 14} and 3.4 {times} 10{sup 14} atoms/cm{sup 2} to support etching, respectively. Adsorption profiles demonstrate that these coverages correspond to initial saturation of the surface with Cs. Electron damage of the surface in the absence of Cs also produces desorption of Al and sub-oxides of Al indicating a possible mechanism for etching. The impact of etching on the surface is to increase the adsorption capacity on the (0001) surface while decreasing both initial adsorption probability and capacity on the (1102) surface.

Zavadil, K.R. [Sandia National Labs., Albuquerque, NM (United States); Ing, J.L. [AEA Technology, Albuquerque, NM (United States)

1995-11-01T23:59:59.000Z

77

Estimation of average burnup of damaged fuels loaded in Fukushima Dai-ichi reactors by using the {sup 134}Cs/{sup 137}Cs ratio method  

Science Conference Proceedings (OSTI)

Average burnup of damaged fuels loaded in Fukushima Dai-ichi reactors is estimated, using the {sup 134}Cs/{sup 137}Cs ratio method for measured radioactivities of {sup 134}Cs and {sup 137}Cs in contaminated soils within the range of 100 km from the Fukushima Dai-ichi nuclear power plants. As a result, the measured {sup 134}Cs/{sup 137}Cs ratio from the contaminated soil is 0.996{+-}0.07 as of March 11, 2011. Based on the {sup 134}Cs/{sup 137}Cs ratio method, the estimated burnup of damaged fuels is approximately 17.2{+-}1.5 [GWd/tHM]. It is noted that the numerical results of various calculation codes (SRAC2006/PIJ, SCALE6.0/TRITON, and MVP-BURN) are almost the same evaluation values of {sup 134}Cs/ {sup 137}Cs ratio with same evaluated nuclear data library (ENDF-B/VII.0). The void fraction effect in depletion calculation has a major impact on {sup 134}Cs/{sup 137}Cs ratio compared with the differences between JENDL-4.0 and ENDF-B/VII.0. (authors)

Endo, T.; Sato, S.; Yamamoto, A. [Dept. of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya-shi, 464-8603 (Japan)

2012-07-01T23:59:59.000Z

78

CsBr/GaN Heterojunction Photoelectron Source  

Science Conference Proceedings (OSTI)

Experimental results on a new CsBr/GaN heterojunction photocathode structure are presented. The results indicate a fourfold improvement in photoyield relative to CsBr/Cr photocathodes. A model is presented based on intraband states in CsBr and electron injection from the GaN (with 1% addition of indium) substrate to explain the observed photoyield enhancement. The photocathode lifetime at high current density (>40 A/cm{sup 2}) is limited by laser heating of the small illuminated area. Calculations are presented for sapphire and diamond substrates, indicating a factor of 20 reduction in temperature for the latter. The results are encouraging for the realization of a high photoyield photocathode operating at high current density with long lifetime.

Maldonado, J.R.; /Stanford U., Elect. Eng. Dept.; Liu, Z.; Sun, Y.; /SLAC, SSRL; Schuetter, S.; /Wisconsin U., Madison; Pianetta, P.; /SLAC, SSRL; Pease, R.F.W.; /Stanford U., Elect. Eng. Dept.

2009-04-30T23:59:59.000Z

79

A C-Based Graphics Library for CS1  

E-Print Network (OSTI)

This paper describes a simple graphics library designed for a CS1 course using ANSI C as its programming language. The library can be implemented easily on a variety of hardware platforms, providing a reasonable level of portability. Implementations currently exist for compilers on the Apple Macintosh, the IBM PC, and Unix workstations; the source code for each of these implementations is publicly available by anonymous FTP from the aw.computer.science/Roberts.CS1.C area on host aw.com. In addition, the public distribution includes a fully standard implementation that generates a PostScript representation of the graphical image.

Eric S. Roberts

1995-01-01T23:59:59.000Z

80

Trapping Fermionic $^{40}$K and Bosonic $^{87}$Rb on a Chip  

E-Print Network (OSTI)

We demonstrate the loading of a Bose-Fermi mixture into a microfabricated magnetic trap. In a single-chamber vacuum system, laser-cooled atoms are transported to the surface of a substrate on which gold wires have been microfabricated. The magnetic field minimum formed near these current-carrying wires is used to confine up to $6\\times10^4$ neutral $^{40}$K atoms. In addition, we can simultaneously load $2 \\times 10^5$ $^{87}$Rb atoms, demonstrating the confinement of two distinct elements with such a trap. In a sequence optimized for $^{87}$Rb alone, we observe up to $1 \\times 10^7$ trapped atoms. We describe in detail the experimental apparatus, and discuss prospects for evaporative cooling towards quantum degeneracy in both species.

S. Aubin; M. H. T. Extavour; S. Myrskog; L. J. LeBlanc; J. Esteve; S. Singh; P. Scrutton; D. McKay; R. McKenzie; I. D. Leroux; A. Stummer; J. H. Thywissen

2005-02-08T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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

Vacuum squeezing via polarization self-rotation and excess noise in hot Rb vapors  

E-Print Network (OSTI)

We present experimental and theoretical analysis of quantum fluctuation in a vacuum field in the presence of orthogonal linearly polarized pump field propagating through a Rb vapor cell. Previously reported theoretical and experimental studies provided somewhat contradictory conclusions regarding the possibility to observe the "squeezed vacuum" -- the reduction of vacuum fluctuations below standard quantum limit -- in this system. Here, using the D1 transitions of Rb in a cell without buffer as as an example, we demonstrate that vacuum squeezing is corrupted by incoherent processes (such as spontaneous emission, elastic scattering, etc.), and its observation is only possible in a specific small region of the experimental parameter space. Numerical simulations, in good agreement with the experiment, demonstrate that the two excited state hyperfine levels play a crucial role in the squeezing and excess noise production. The significant influence of far-detuned atoms on the field fluctuations at low noise freque...

Mikhailov, Eugeniy E; Noel, Thomas W; Novikova, Irina

2009-01-01T23:59:59.000Z

82

Animation programming: an alternative approach to CS1  

Science Conference Proceedings (OSTI)

The current problem faced by many computing departments is that only those already self-selected into computing sign up for "CS121 Programming and Problem Solving I", or the similarly named and presented first course. An Animation Programming course ... Keywords: animation, computer science curriculum, object oriented

Louise Moses

2006-06-01T23:59:59.000Z

83

Cycle 20 CS Training COS/STIS Instrument Team  

E-Print Network (OSTI)

is the fundamental reason for the existence of the InsCtute and our scienCfic staff 2://www.stsci.edu/hst/proposing/docs/proposingOverview & COS Instrument Handbook- Chapter 10 COS/STIS CS training - P. Sonnentrucker 6 of submission. The detailed BOT procedures are in COS IHB: chapter 10: hbp://www.stsci.edu/hst/cos/documents/handbooks

Sirianni, Marco

84

BRUCE CHILDERS http://www.cs.pitt.edu/PCM  

E-Print Network (OSTI)

in 2011 ¨ 30 new coal fired power plants by 2015 ¨ CO2 half of airline and third of steel industries ¨ CO2 childers@cs.pitt.edu Surfing the Wave of Emerging Hybrid Memory Architectures image source: Wikipedia Data, several studies show the contribution of memory to the total cost and power consumption of future systems

Childers, Bruce

85

CS1, arcade games and the free Java book  

Science Conference Proceedings (OSTI)

Computer game programming has been adopted by some instructors and schools in an effort to motivate students and make the learning more relevant to the student's world than the console programs many of their instructors learned with. This paper describes ... Keywords: acm java, cs1, free java book, games

Daniel L. Schuster

2010-03-01T23:59:59.000Z

86

Having a BLAST: a bioinformatics project in CS2  

Science Conference Proceedings (OSTI)

DNA analysis is a subject that is in the news almost every day, whether it be a new advance in medical research, a criminal trial, or some other application. BLAST (Basic Local Alignment Search Tool) is an important tool used by biologists worldwide ... Keywords: CS2, bioinformatics, object-oriented design, programming project

Pamela Cutter

2007-03-01T23:59:59.000Z

87

Bridging ICT and CS: educational standards for computer science in lower secondary education  

Science Conference Proceedings (OSTI)

Recently, the importance of computer science education in secondary schools has been coming more and more into focus. Students' interests and motivation to pursue a career in CS related fields are highly influenced by school. Also beliefs in the nature ... Keywords: CS ed research, K-12, didactics of informatics, educational standards, gender, pedagogy, secondary CS education

Torsten Brinda; Hermann Puhlmann; Carsten Schulte

2009-07-01T23:59:59.000Z

88

DOE _Final_ DOE - Enclosure 4 to 2005 CS 647b Report OMB.d…...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

4 to 2005 CS 647b Report OMB.d&8230;&0; DOE Final DOE - Enclosure 4 to 2005 CS 647b Report OMB.d&8230;&0; DOE Final DOE - Enclosure 4 to 2005 CS 647b Report...

89

Implementation of an Unrestricted File Organization for Micro-PL/CS  

Science Conference Proceedings (OSTI)

Micro PL/CS is a version of PL/CS developed for a single-user, interactive environment. A file system extension makes PL/CS self-sufficient for standalone file processing and secondary storage management. The basis of the file system extension is the ...

James E. Archer, Jr.

1979-02-01T23:59:59.000Z

90

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

State/Regional/Local Assistance for State/Regional/Local Assistance for Interconnection Transmission Planning and Ana Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): American Recovery and Reinvestment Act of 2009 (Recovery Act) State/Regional/Local Assistance for Interconnection Transmission Planning and Ana Based on OE's review of the information concerning the proposal action, the NEPA compliance Officer has determined that the proposed action fits within the specified class of action, other regulatory requirements set forth are met, and proposed action is hereby categorically excluded from further NEPA review. Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): American Recovery and Reinvestment

91

Record of Categorical Exclusion (CS) Determination, Office of Electricity  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Smart Grid Investment Grant Program Smart Grid Investment Grant Program (EISA 1306) Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): American Recovery and Reinvestment Act of 2009 (Recovery Act) Smart Grid Investment Grant Program (EISA 1306) Based on OE's review of the information concerning the proposal action, the NEPA compliance Officer has determined that the proposed action fits within the specified class of action, other regulatory requirements set forth are met, and proposed action is hereby categorically excluded from further NEPA review. Record of Categorical Exclusion (CS) Determination, Office of Electricity Delivery and Energy Reliability (OE): American Recovery and Reinvestment Act of 2009 (Recovery Act) Smart Grid Investment Grant Program (EISA 1306)

92

Duration Test Report for the Viryd CS8 Wind Turbine  

DOE Green Energy (OSTI)

This report summarizes the results of a duration noise test that the National Renewable Energy Laboratory (NREL) conducted on the Viryd CS8 wind turbine. This test was conducted in accordance with Clause 9.4 of the International Electrotechnical Commission's (IEC) standard, Wind turbines - Part 2: Design requirements for small wind turbines, IEC 61400-2 Ed. 2.0:2006-03. NREL researchers evaluated the turbine based on structural integrity and material degradation, quality of environmental protection, and dynamic behavior.

Roadman, J.; Murphy, M.; van Dam, J.

2013-06-01T23:59:59.000Z

93

Rubidium (Rb)  

Science Conference Proceedings (OSTI)

Table 38   Electron binding energy of rubidium...Shell Electron configuration Binding energy, eV K 1 s 15,200 L(I) 2 s 2,065 L(II) 2 p 1/2 1,864 L(III) 2 p 3/2 1,804 M(I) 3 s 326.7 M(II) 3 p 1/2 246.7 M(III) 3 p 3/2 239.1 M(IV) 3 d 3/2 113 M(V) 3 d 5/2 112 N(I) 4 s 30.5 N(II) 4 p 1/2 16.3 N(III) 4 p 3/2 15.3 Source: Ref 328...

94

Buffer-gas-induced absorption resonances in Rb vapor RID B-9041-2008  

E-Print Network (OSTI)

We observe transformation of the electromagnetically induced transparency (EIT) resonance into an absorption resonance in a Lambda interaction configuration in a cell filled with Rb-87 and a buffer gas. This transformation occurs as one-photon detuning of the coupling fields is varied from the atomic transition. No such absorption resonance is found in the absence of a buffer gas. The width of the absorption resonance is several times smaller than the width of the EIT resonance, and the changes of absorption near these resonances are about the same. Similar absorption resonances are detected in the Hanle configuration in a buffered cell.

Mikhailov, E. E.; Novikova, I.; Rostovtsev, Y. V.; Welch, George R.

2004-01-01T23:59:59.000Z

95

Superconductivity at 28. 6 K in rubidium-C sub 60 fullerene compound, Rb sub x C sub 60 synthesized by a solution-phase technique  

Science Conference Proceedings (OSTI)

A solution-phase technique previously reported in this journal has been applied to the synthesis of a Rb-containing product of the composition Rb{sub x}C{sub 60} having a T{sub c} of 28.6K. The preparation time was rapid, and the method should be applicable to the synthesis of other similar materials. The superconducting materials of both the K- and Rb-doped materials were formed in only small concentrations. The superconducting phase of the Rb{sub x}C{sub 60} product was found to be unstable in moist air. 6 refs., 2 figs.

Wang, H.H.; Kini, A.M.; Savall, B.M.; Carlson, K.D.; Williams, J.M.; Lathrop, M.W.; Lykke, K.R.; Wurz, P.; Pellin, M.J.; Gruen, D.M.; Welp, U.; Kwok, Waikwong; Fleshler, S.; Crabtree, G.W. (Argonne National Lab., IL (United States)); Parker, D.H. (Argonne National Lab., IL (United States) Univ. of California, Irvine (United States)); Schirber, J.E.; Overmyer, D.L. (Sandia National Labs., Albuquerque, NM (United States))

1991-07-24T23:59:59.000Z

96

Transfer of TiN/Ti/Ag metallization research  

Science Conference Proceedings (OSTI)

A simple technology for manufacturing extremely stable silicon solar cells is described. The process uses a sputtering technique to reactively deposit high quality TiN films to be used as diffusion barrier layers in metallization systems. The deposition parameters have been optimized to yield films with low-stress and with resistivities as low as 50..mu.. ohm-cm. The TiN films act as an excellent metal diffusion barrier layer below the contact grid-lines, and also upon controlled oxidation as a good anti-reflection coating of TiO/sub 2/ in the active area of the solar cell. Such a unique and dual application of the TiN layer considerably simplifies the fabrication of the cells. Cells so prepared are found to be stable with no degradation in their electrical performance after heat treatments up to 600/sup 0/C for 15 minutes. The application of TiN films in obtaining stable ohmic contacts to GaAs has also been investigated. Ohmic contacts to p-type GaAs have been formed with GaAs/Pt(mG)/TiN/Ag system, which possess low contact resistivity stable up to 550/sup 0/C heat treatments.

Tandon, J.

1986-05-01T23:59:59.000Z

97

Electron 83 Rb / 83m Kr Source for the Energy Scale Monitoring in the KATRIN Experiment  

Science Conference Proceedings (OSTI)

The KATRIN (KArlsruhe TRItium Neutrino) experiment investigates the endpoint region of the tritium ??spectrum aiming for the sensitivity on the neutrino mass of 0.2 eV (90% C.L.). A spectrometer of the MAC?E filter (Magnetic Adiabatic Collimation with an Electrostatic filter) type will be used for a total time of at least 5 years. An unrecognized shift of the filtering potential would directly influence the resulting neutrino mass. To continuously monitor the filtering potential the high voltage (HV) will be simultaneously applied to an additional MAC?E filter spectrometer. In this monitor spectrometer suitable electron sources based on atomic/nuclear standards will be utilized. As one of such monitoring tools the solid 83 Rb / 83m Kr source is intended. It provides conversion electrons from 83m Kr (t 1/2 ?=?1.83? h ) which is continuously generated by 83 Rb (t 1/2 ?86? d ). The Calibration and Monitoring task of the KATRIN project demands the long?term energy stability ?E/E of the K?32 conversion electron line (E?=?17.8? keV ???=?2.7? eV ) of ±1.6? ppm / month .

Miroslav Zbo?il; The KATRIN collaboration

2011-01-01T23:59:59.000Z

98

Vacuum squeezing via polarization self-rotation and excess noise in hot Rb vapors  

E-Print Network (OSTI)

We present experimental and theoretical analysis of quantum fluctuation in a vacuum field in the presence of orthogonal linearly polarized pump field propagating through a Rb vapor cell. Previously reported theoretical and experimental studies provided somewhat contradictory conclusions regarding the possibility to observe the "squeezed vacuum" -- the reduction of vacuum fluctuations below standard quantum limit -- in this system. Here, using the D1 transitions of Rb in a cell without buffer as as an example, we demonstrate that vacuum squeezing is corrupted by incoherent processes (such as spontaneous emission, elastic scattering, etc.), and its observation is only possible in a specific small region of the experimental parameter space. Numerical simulations, in good agreement with the experiment, demonstrate that the two excited state hyperfine levels play a crucial role in the squeezing and excess noise production. The significant influence of far-detuned atoms on the field fluctuations at low noise frequencies imposes the explicit consideration of the full velocity distribution of the atomic vapor.

Eugeniy E. Mikhailov; Arturo Lezama; Thomas W. Noel; Irina Novikova

2009-03-18T23:59:59.000Z

99

Kinetics of Mismatch Formation opposite Lesions by the Replicative DNA Polymerase from Bacteriophage RB69  

Science Conference Proceedings (OSTI)

The fidelity of DNA replication is under constant threat from the formation of lesions within the genome. Oxidation of DNA bases leads to the formation of altered DNA bases such as 8-oxo-7,8-dihydroguanine, commonly called 8-oxoG, and 2-hydroxyadenenine, or 2-OHA. In this work we have examined the incorporation kinetics opposite these two oxidatively derived lesions as well as an abasic site analogue by the replicative DNA polymerase from bacteriophage RB69. We compared the kinetic parameters for both wild type and the low fidelity L561A variant. While nucleotide incorporation rates (k{sub pol}) were generally higher for the variant, the presence of a lesion in the templating position reduced the ability of both the wild-type and variant DNA polymerases to form ternary enzyme-DNA-dNTP complexes. Thus, the L561A substitution does not significantly affect the ability of the RB69 DNA polymerase to recognize damaged DNA; instead, the mutation increases the probability that nucleotide incorporation will occur. We have also solved the crystal structure of the L561A variant forming an 8-oxoG {center_dot} dATP mispair and show that the propensity for forming this mispair depends on an enlarged polymerase active site.

Hogg, Matthew; Rudnicki, Jean; Midkiff, John; Reha-Krantz, Linda; Doubli, Sylvie; Wallace, Susan S. (Alberta); (Vermont)

2010-04-12T23:59:59.000Z

100

Performance Testing of Radiant Barriers (RB) with R11, R19, and R30 Cellulose and Rock Wool Insulation  

E-Print Network (OSTI)

TVA has previously conducted testing to determine the effects of attic RBs when used with R19 fiberglass insulation during summer and winter conditions. This previous testing, and the testing described in this paper, used five small test cells exposed to ambient conditions. Heat flux transducers measured heat transfer between the attic and conditioned space. The objective of the testing described in this paper was to determine summer and winter RB performance when used with cellulose and rock wool insulations at R-vale levels of R11, R19, and R30. In addition, several summer side-by-side tests were conducted to determine the effects of: dust on RB performance, a low-emissivity paint, a high-emissivity material (black plastic) laid directly on top of the insulation, and single-sided RB placed on top of the insulation (RBT) with the reflective side down.

Hall, J. A.

1988-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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

Synthesis and optical properties of CsC1-doped gallium-sodium-sulfide glasses  

SciTech Connect

Ga{sub 2}S{sub 3}-Na{sub 2}S (GNS) glasses doped with CsCl were synthesized in open crucibles under inert atmosphere. The evaporative loss of CsCl during glass melting was measured by energy dispersive X-ray spectroscopy and corrected for by biasing the CsCl concentration in the mixture of starting materials to obtain glasses with accurately controlled stoichiometry. Glass transition temperatures, refractive index dispersions, and band edge energies were measured for four GNS:CsCl glasses, and the respective values were found to significantly improve over earlier studies that did not mitigate CsCl evaporative losses. The refractive index dispersion measurements indicate that the Cs{sup +} and Cl{sup -} radii are 16% larger in GNS:CsCl glass than in bulk crystalline CsCl. The band edge energy increases from 2.97 eV in GNS glass to 3.32 eV in GNS glass doped with 20 mol% CsCl as a result of introducing Cl{sup -} ions having a large optical electronegativity. The large bandgap of 3.32 eV and the low (450 cm{sup -1}) phonon energy make GNS:20%CsCl an attractive host material for rare-earth ions with radiative transitions in the near ultra-violet, visible, and near-infrared spectral regions.

Hehlen, Markus P [Los Alamos National Laboratory; Bennett, Bryan L [Los Alamos National Laboratory; Williams, Darrick J [Los Alamos National Laboratory; Muenchausen, Ross E [Los Alamos National Laboratory; Castro, Alonso [Los Alamos National Laboratory; Tornga, Stephanie C [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

102

Structure and optical properties of a noncentrosymmetric borate RbSr{sub 4}(BO{sub 3}){sub 3}  

SciTech Connect

A new noncentrosymmetric borate, RbSr{sub 4}(BO{sub 3}){sub 3} (abbreviated as RSBO), has been grown from Rb{sub 2}O--B{sub 2}O{sub 3}--RbF flux and its crystal structure was determined by single crystal x-ray diffraction. It crystallizes in space group Ama2 with cell parameters of a=11.128(10) A, b=12.155(15) A, c=6.952(7) A, Z=4. The basic structural units are isolated planar BO{sub 3} groups. Second harmonic generation (SHG) test of the title compound by the Kurtz-Perry method shows that RSBO can be phase matchable with an effective SHG coefficient about two-thirds as large as that of KH{sub 2}PO{sub 4} (KDP). Finally, based on the anionic group approximation, the optical properties of the title compound are compared with those of the structure-related apatite-like compounds with the formula 'A{sub 5}(TO{sub n}){sub 3}X'. - Graphical abstract: RbSr{sub 4}(BO{sub 3}){sub 3} and some other borate NLO compounds, namely Ca{sub 5}(BO{sub 3}){sub 3}F RCa{sub 4}(BO{sub 3}){sub 3}O (R=Y or Gd) and Na{sub 3}La{sub 2}(BO{sub 3}){sub 3} can be viewed as the derivatives of apatite. They have similar formula composed of five cations and three anion groups (we call them 5/3 structures). The detailed SHG coefficients and optical properties of the apatite-like NLO crystals were compared and summarized. Highlights: Black-Right-Pointing-Pointer A new noncentrosymmetric borate RbSr{sub 4}(BO{sub 3}){sub 3} was grown from flux. Black-Right-Pointing-Pointer The RbSr{sub 4}(BO{sub 3}){sub 3} can be viewed as a derivative of the apatite-like structure. Black-Right-Pointing-Pointer The structure and its relationship to the optical properties of RbSr{sub 4}(BO{sub 3}){sub 3} are compared with other NLO crystals with apatite-like structures. Black-Right-Pointing-Pointer The basic structural units are the planar BO{sub 3} groups in the structure. Black-Right-Pointing-Pointer Second harmonic generation (SHG) test shows that RbSr{sub 4}(BO{sub 3}){sub 3} can be phase matchable with an effective SHG coefficient about two-thirds as large as that of KH{sub 2}PO{sub 4}.

Xia, M.J. [Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 (China); Li, R.K., E-mail: rkli@mail.ipc.ac.cn [Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)

2013-01-15T23:59:59.000Z

103

NREL: Wind Research - Viryd Technologies' CS8 Turbine Testing and Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Viryd Technologies' CS8 Turbine Testing and Results Viryd Technologies' CS8 Turbine Testing and Results Viryd Technologies CS8 wind turbine. Text Version As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL is testing Viryd Technologies' CS8 small wind turbine at the National Wind Technology Center (NWTC). The CS8 is an upwind, horizontal-axis, three-bladed, stall controlled turbine rated at 8 kilowatts (kW). It has an 8.5-meter rotor diameter and is mounted on a guyed tilt-up lattice tower with a hub height of 24.9 meters. The CS8 uses a single-phase, grid-connected, induction generator that operates at 240 volts AC. Testing Summary Supporting data and explanations for data included in this table are provided in the final reports.

104

Gamma-ray decay schemes for $sup 93$Kr, $sup 93$Rb, and $sup 93$Sr  

SciTech Connect

A study of the gamma-ray de-excitation following the beta decays of $sup 93$Kr, $sup 93$Rb, and $sup 93$Sr using the TRISTAN on-line separator facility is reported. Gamma-ray singles and gamma-gamma coincidence measurements were made using Ge(Li) detectors. Of the 162 gamma rays observed in the decay of $sup 93$Sr, 143, representing more than 99 percent of the total gamma-ray intensity observed, were placed in a level scheme containing 36 levels. For the decay of $sup 93$Rb, 243 gamma rays were observed, of which 231 are placed in a level scheme consisting of 74 levels. This again represents a placement of over 99 percent of the total gamma-ray intensity measured. In the case of the $sup 93$Kr decay approximately 98.5 percent of the observed gamma-ray intensity has been accounted for by the proposed level scheme. This results from the placement of 203 of the 217 gamma rays assigned to this decay in a level scheme comprising 56 levels. Beta-branching for these decays were determined from transition intensity balances. Spin and parity assignments were proposed, whenever possible, on the basis of gamma-ray transition probabilities and deduced log ft values. A comparison is made with the available reaction data for the $sup 93$Y level scheme. In all cases an attempt has been made to explain some of the levels in terms of the nuclear shell model and decay systematics. 18 figures, 20 tables, 68 references. (auth)

Bischof, C.J.

1976-01-01T23:59:59.000Z

105

Direct measurement of the $^{44}$Ti($\\alpha$,p) reaction of importance to supernovae, using reclaimed $^{44}$Ti  

E-Print Network (OSTI)

Direct measurement of the $^{44}$Ti($\\alpha$,p) reaction of importance to supernovae, using reclaimed $^{44}$Ti

CERN. Geneva; Lindroos, Mats; CERN. Geneva. ISOLDE and Neutron Time-of-Flight Experiments Committee; INTC

2007-01-01T23:59:59.000Z

106

Export.gov - Welcome to CS World Bank  

NLE Websites -- All DOE Office Websites (Extended Search)

World Bank World Bank Print | E-mail Page World Bank World Bank Home Doing Business with the World Bank Services for U.S. Companies Trade Events Links About the World Bank New Projects from the World Bank Understanding the Project Cycle The PSLO Program Contact Us Our Worldwide Network About Us Press Room Other Multilateral Development Banks Other Worldwide Markets Welcome to CS World Bank! The World Bank lends and invests billions of dollars in developing countries every year. This constant stream of funds is used to buy goods, consulting services, and civil works projects that contribute to economic development in those countries. The system of doing business with the World Bank is similar to government procurement systems in many countries. Our Global Network at Work Learn how a small manufacturing company began exporting to Turkey

107

Figure 1: a-c) Preliminary data from a representative volunteer comparing nonlinear CS reconstruction method with the conventional linear Fourier reconstruction. The CS  

E-Print Network (OSTI)

is analyzed. Methods: CS theory suggests that if any signal of interest has underlying structure which renders imaging sequence consisted of 3 modules: DSG (or DIR) preparation, fat saturation and 3D-IVI FSE imaging

Southern California, University of

108

It/cs workshop: multimodal, multimedia courseware for teaching technical concepts in humanistic context  

Science Conference Proceedings (OSTI)

As global competition in IT increases, IT/CS students must learn concepts, theory, and implementation more efficiently, more broadly (e.g., technical and humanistic context) and in greater technical depth. IT (esp. CS and mathematics) is data-intensive ... Keywords: courseware, distributed learning, performance measurement

Mark S. Schmalz; Lynn Conway

2008-10-01T23:59:59.000Z

109

Distribution of the 83Rb/83mKr activity on vacuum evaporated samples examined with the Timepix position sensitive detector  

E-Print Network (OSTI)

Properties of vacuum evaporated 83Rb/83mKr sources of low-energy conversion electrons, which are under development for monitoring the energy scale stability of the Karlsruhe Tritium Neutrino experiment KATRIN, were examined by the Timepix pixel detector exhibiting the position resolution of at least 55 microm. No distinct local inhomogeneities in the surface distribution of 83Rb/83mKr were observed. The source diameter derived from the recorded image agrees within 5 % with that expected from evaporation geometry. More precise determination of the actual source diameter is complicated by Compton scattered electrons caused by 83Rb gamma-rays.

D. Venos; J. Jakubek; O. Dragoun; S. Pospisil

2007-12-22T23:59:59.000Z

110

¡£¢¥¤¦¤§¢¥ © !#"$¢¥& %'( )0 1#'() 24 36587@9BACA DF ...  

Science Conference Proceedings (OSTI)

... HE58s€T$G s!5@I$5WI$5@TiI `C5@vB58 #w DG$9EpyAc5 E58 r`b9Bsg oBI 9YpaVq `bG( G$VPQts6sˆ `Csˆ ”‰`Co„HPI$5 EPw( ™ VP56 oBI ...

2002-08-22T23:59:59.000Z

111

Hanford Isotope Project strategic business analysis Cesium-137 (Cs-137)  

SciTech Connect

The purpose of this business analysis is to address the beneficial reuse of Cesium 137 (Cs-137) in order to utilize a valuable national asset and possibly save millions of tax dollars. Food irradiation is the front runner application along with other uses. This business analysis supports the objectives of the Department of Energy National Isotope Strategy distributed in August 1994 which describes the DOE plans for the production and distribution of isotope products and services. As part of the Department`s mission as stated in that document. ``The Department of Energy will also continue to produce and distribute other radioisotopes and enriched stable isotopes for medical diagnostics and therapeutics, industrial, agricultural, and other useful applications on a businesslike basis. This is consistent with the goals and objectives of the National Performance Review. The Department will endeavor to look at opportunities for private sector to co-fund or invest in new ventures. Also, the Department will seek to divest from ventures that can more profitably or reliably be operated by the private sector.``

NONE

1995-10-01T23:59:59.000Z

112

Direct SNG production by the CS/R hydrogasification process  

Science Conference Proceedings (OSTI)

The CS/R Hydrogasification Process utilizes a short residence-time entrained-flow reactor, derived from aerospace rocket reactor technology, for quickly reacting pulverized coal with hot hydrogen to directly produce substitute natural gas (SNG). Development testing has indicated the feasibility of two primary process options: the production of SNG as the sole major product or the coproduction of SNG and chemical-grade benzene. Recent emphasis has focused on process design, optimization, and economics. Preliminary design studies of commercial-scale (250 x 10/sup 9/ Btu/day) grassroots SNG plants have been completed for two widely different types of feedstock: Kentucky No. 9 hvAb coal and Minnesota peat. This paper summarizes the pertinent experimental data and analytical modeling studies of flash hydropyrolysis used as a basic input to the process design effort. The commercial process flowsheets for each feedstock are described, and the resultant capital and operating costs are discussed. Sensitivity analyses are presented relating the cost of gas to the major process operating variables and economic parameters.

Kahn, D.R.; Combs, L.P.; Garey, M.P.

1983-08-01T23:59:59.000Z

113

DOSE TO CURIE DETERMINATION FOR CONTAINERS WITH MEASURABLE CS-137  

Science Conference Proceedings (OSTI)

The Next Generation Retrieval (NGR) project will retrieve suspect transuranic (TRU) waste containers from Trenches 17 and 27 in the 218-E-12B (12B) burial ground. The trenches were in operation from May 1970 through October 1972. A portion of the retrieved containers that will require shipment to and acceptance at a treatment, storage, and disposal (TSD) facility and the containers will be either remote-handled (RH) and/or contact-handled (CH). The method discussed in this document will be used for the RH and some of the CH containers to determine the radionuclide inventory. Waste disposition (shipment and TSD acceptance) requires that the radioactive content be characterized for each container. Source-term estimates using high resolution, shielded, gamma-ray scan assay techniques cannot be performed on a number of RH and other containers with high dose rates from {sup 137}Cs-{sup 137m}Ba. This document provides the method to quantify the radioactive inventory of fission product gamma emitters within the containers based on the surface dose rate measurements taken in the field with hand-held survey instruments.

RATHBUN LA; ANDERSON JD; SWAN RJ

2010-12-03T23:59:59.000Z

114

PRODUCTIOR"OF TRORI~JW~IETALIWES PROCESS F6R RB)IJCIRO T&Old 2 ':  

Office of Legacy Management (LM)

PRODUCTIOR"OF TRORI~JW~IETALIWES PROCESS F6R RB)IJCIRO T&Old 2 ': PRODUCTIOR"OF TRORI~JW~IETALIWES PROCESS F6R RB)IJCIRO T&Old 2 ': am wm ..,. :I.::. ? ; \: :.:, .,, : ,. / 1. ..ri:,:,.:, :/ I 8yblBOLa PPaJPT i: >. ,,;.;~:,,; ,;.. !,., ,ip; ,,,:. ;., -. , ^ , . . 3 '>) ! .,:<;:,,..,. ; : :..,, ,,.+ -../ ,:,; I,:;?: ..: : ,, ,,: ; !. (' '; ::, Durine,~~~v%eit'to Amae &8Htate~Coliegd on Mar6h 4 and 2 to dl&ni& prinalpally~~asl~~prd~ess~~~1 also r&&&d wltlvDii 8. Wilhelm and Dr. D. Peterson of An~?e Iowa State College their ?xperimantal work on%hC14yt~ep,yp6n,,~ 'iti eotl,m ~th.~gxtssiun t6 tborlum metal.- ;:'..?a: :. ( : ; ;2,& : '. .' ; '; :: !,%. :: '.. , 2. * BumDary. y2, ,, vii,:;,. ,:,, r: '.,;.','. ,;I ,' .,._..I :, . .._., 7::: 1 ::.! "j:. *.,,: ,,,, ::':?;.: :,,;,

115

Spectroscopy and lifetime measurements of states in {sup 76}Kr populated in {sup 76}Rb decay  

SciTech Connect

The properties of the excited states of {sup 76}Kr, populated in the decay of {sup 76}Rb produced at ISOLDE isotopic separator, have been investigated by using K-conversion electron, {gamma}-ray, and {gamma}-{gamma} coincidence measurements. The lifetimes of several levels have been measured by means of the advanced time-delayed {beta}{gamma}{gamma}(t) method. The identification of 19 new levels and 55 transitions and the information deduced on spin and/or parity of the observed states from K-conversion coefficients, log ft values and decay properties have led to an improved knowledge of the level scheme. In particular, six 1{sup -} states have been definitely identified and J{sup {pi}}=2{sup -} has been assigned to the 2227 keV level, on which a band proposed to have negative-parity and even-spin had been previously observed. The strengths of the E0 and E2 transitions deexciting the 0{sub 2}{sup +} and 0{sub 3}{sup +} states (the latter is here identified with the state at 1598 keV) have been measured. The experimental data concerning the 0{sub 2}{sup +} state have been analyzed in a simple two states mixing model and in the framework of the proton-neutron interacting boson model.

Giannatiempo, A.; Perego, A.; Sona, P.; Nannini, A.; Mach, H.; Fogelberg, B.; Borge, M.J.G.; Tengblad, O.; Fraile, L.M.; Aas, A.J.; Gulda, K. [Dipartimento di Fisica, Universita di Firenze and Istituto Nazionale di Fisica Nucleare, Florence (Italy); Istituto Nazionale di Fisica Nucleare, Florence (Italy); Department of Radiation Sciences, University of Uppsala, S-75121 Uppsala (Sweden); Instituto 'Estructura de la Materia' Consejo Superior de Investigaciones Cientificas, Madrid (Spain); McKinsey and Company, Oslo (Norway); Ministry of Economic Affairs and Labour Department of Innovation, Warsaw (Poland)

2005-10-01T23:59:59.000Z

116

Quasi-two-dimensional quantum states of H{sub 2} in stage-2 Rb-intercalated graphite  

DOE Green Energy (OSTI)

Inelastic-incoherent-neutron scattering can be a valuable nanostructural probe of H{sub 2}-doped porous materials, provided the spectral peaks can be interpreted in terms of crystal-field-split hydrogen-molecule energy levels, which represent a signature of the local symmetry. Inelastic-neutron-scattering measurements as well as extensive theoretical analyses have been performed on stage-2 Rb-intercalated graphite (Rb-GIC), with physisorbed H{sub 2}, HD, and D{sub 2}, a layered porous system with abundant spectral peaks, to assess whether the crystal-field-state picture enables a quantitative understanding of the observed structure. Potential-energy surfaces for molecular rotational and translational motion, as well as the intermolecular interactions of hydrogen molecules in Rb-GIC, were calculated within local-density-functional theory (LDFT). Model potentials, parameterized using results of the LDFT calculations, were employed in schematic calculations of rotational and translational excited state spectra of a single physisorbed H{sub 2} molecule in Rb-GIC. Results of the analysis are basically consistent with the assignment by Stead et al. of the lowest-lying peak at 1.4 meV to a rotational-tunneling transition of an isotropic hindered-rotor oriented normal to the planes, but indicate a small azimuthal anisotropy and a lower barrier than for the isotropic case. Based on the experimental isotope shifts and the theoretically predicted states, they conclude that spectral peaks at 11 and 22 meV are most likely related to center of mass excitations.

Smith, A.P.; Benedek, R.; Trouw, F.R.; Minkoff, M. [Argonne National Lab., IL (United States); Yang, L.H. [Lawrence Livermore National Lab., CA (United States). Physics/H-Div.

1995-10-30T23:59:59.000Z

117

Performance Study of K2CsSb Photocathode Inside a DC High Voltage Gun  

SciTech Connect

In the past decade, there has been considerable interest in the generation of tens of mA average current in a photoinjector. Until recently, GaAs:Cs cathodes and K{sub 2}CsSb cathodes have been tested successfully in DC and RF injectors respectively for this application. Our goal is to test the K{sub 2}CsSb photocathode inside a DC gun. Since the multialkali cathode is a compound with constant characteristics over its entire thickness, we anticipate that the lifetime issues seen in GaAs:Cs due to surface damage by ion bombardment would be minimized. Hence successful operation of the K{sub 2}CsSb cathode in a DC gun could lead to a relatively robust electron source capable of delivering ampere level currents. In order to test the performance of a K{sub 2}CsSb cathode in a DC gun, we have designed and built a load lock system that allows the fabrication of the cathode at Brookhaven National Lab (BNL) and its testing at Jefferson Lab (JLab). In this paper, we will present the performance of the K{sub 2}CsSb photocathode in the preparation chamber and in the DC gun.

McCarter J. L.; Rao T.; Smedley, J.; Grames, J.; Mammei, R.; Poelker, M.; Suleiman, R.

2011-09-01T23:59:59.000Z

118

Candidate chiral doublet bands in the odd-odd nucleus $^{126}$Cs  

E-Print Network (OSTI)

The candidate chiral doublet bands recently observed in $^{126}$Cs have been extended to higher spins, several new linking transitions between the two partner members of the chiral doublet bands are observed, and $\\gamma$$-$intensities related to the chiral doublet bands are presented by analyzing the $\\gamma$$-$$\\gamma$ coincidence data collected earlier at the NORDBALL through the $^{116}$Cd$($$^{14}$N, 4n$)$$^{126}$Cs reaction at a beam energy of 65 MeV. The intraband $B(M1)/B(E2)$ and interband $B(M1)_{in}/B(M1)_{out}$ ratios and the energy staggering parameter, S(I), have been deduced for these doublet bands. The results are found to be consistent with the chiral interpretation for the two structures. Furthermore, the observation of chiral doublet bands in $^{126}$Cs together with those in $^{124}$Cs, $^{128}$Cs, $^{130}$Cs and $^{132}$Cs also indicates that the chiral conditions do not change rapidly with decreasing neutron number in these odd-odd Cesium isotopes.

S. Y. Wang; Y. Z. Liu; T. Komatsubara; Y. J. Ma; Y. H. Zhang

2007-02-05T23:59:59.000Z

119

Entropy Evaluation of the Superprotonic Phase of CsHSO4: Pauling's Ice Rules Adjusted for Systems Containing Disordered  

E-Print Network (OSTI)

Entropy Evaluation of the Superprotonic Phase of CsHSO4: Pauling's Ice Rules Adjusted for SystemsVised Manuscript ReceiVed October 26, 2006 The entropy of the superprotonic transition (phase II f phase I) of Cs of the superprotonic, disordered phase of CsHSO4 is evaluated using an approach similar to that employed by Pauling

120

HVOF Thermal Spray TiC/TiB2 Coatings of AUSC Boiler/Turbine ...  

Science Conference Proceedings (OSTI)

The paper presents the research endeavors to synthesize TiC and TiB2 coatings on existing boiler materials for applications at high temperatures (500 -750 oC) ...

Note: This page contains sample records for the topic "ti rb cs" 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

Pure rotational spectra of TiO and TiO_2 in VY Canis Majoris  

E-Print Network (OSTI)

We report the first detection of pure rotational transitions of TiO and TiO_2 at (sub-)millimeter wavelengths towards the red supergiant VY CMa. A rotational temperature, T_rot, of about 250 K was derived for TiO_2. Although T_rot was not well constrained for TiO, it is likely somewhat higher than that of TiO_2. The detection of the Ti oxides confirms that they are formed in the circumstellar envelopes of cool oxygen-rich stars and may be the "seeds" of inorganic-dust formation, but alternative explanations for our observation of TiO and TiO_2 in the cooler regions of the envelope cannot be ruled out at this time. The observations suggest that a significant fraction of the oxides is not converted to dust, but instead remains in the gas phase throughout the outflow.

Kaminski, T; Menten, K M; Patel, N A; Young, K H; Brunken, S; Muller, H S P; McCarthy, M C; Winters, J M; Decin, L

2013-01-01T23:59:59.000Z

122

Gamma TiAl Alloys 2014  

Science Conference Proceedings (OSTI)

Jul 15, 2013... for selective laser melting – from single track to fully dense specimens ... Rolling and Grinding of Thin Sheets of Beta-Solidified Gamma TiAl ...

123

2003 CS 647b Report Transmittal Letter to Dick Cheney | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2003 CS 647b Report Transmittal Letter to Dick Cheney 2003 CS 647b Report Transmittal Letter to Dick Cheney 2003 CS 647b Report Transmittal Letter to Dick Cheney 2003 CS 647b Report Transmittal Letter to Dick Cheney This letter is in response to the annual Competitive Sourcing reporting requirement contained in section 647(b) of Division F of the Consolidated Appropriations Act, for FY 2004, P.L. 108-199. The enclosed report on the Department of Energy's (DOE) Competitive Sourcing program complies with the agency reporting elements outlined in P.L. 108-199 for submitting the annual Congressional Competitive Sourcing Activity Report. In summary, DOE's Fiscal Year (FY) 2003 Competitive Sourcing Activity Report includes cost, savings, Federal full-time equivalent (FTE), and other information on the Department's

124

A comparison of {sup 137}Cs radioactivity in localized evergreen and deciduous plant species  

SciTech Connect

A vegetation study at the Comanche Peak Steam Electric Station (CPSES) near Glen Rose, Texas was conducted in 1991 and 1992. The CPSES is a commercial nuclear power plant owned and operated by Texas Utilities Electric of Dallas, Texas. The US Nuclear Regulatory Commission (USNRC) requires the CPSES to routinely sample broadleaf vegetation in place of milk samples. Few commercial dairies exist in the vicinity. Broadleaf tree species are scarce because the climate and local limestone geology have produced a dry rolling hill topography. An evergreen juniper is the dominant tree species. Few broadleaves during the winter season have hindered year-round sampling. This study compares the environmental {sup 137}Cs concentrations between broadleaf and evergreen foliage at CPSES. Soil {sup 137}Cs concentrations from each vegetation location were also compared to the foliage {sup 137}Cs concentrations. The study`s objective was to determine if the deciduous and evergreen vegetation {sup 137}Cs concentrations are statistically the same.

Rangel, R.C.

1996-05-01T23:59:59.000Z

125

Modeling spatial variability of 137Cs surface activity in a mountain zone  

Science Conference Proceedings (OSTI)

Based on 137Cs surface activity field studies performed on a workshop zone, we succeeded in identifying the main criterion permitting surface activity modeling to be extended. Geomorphometric data derived from the Digital Elevation Model (slope, ...

J. M. Métivier; L. Pourcelot

2002-01-01T23:59:59.000Z

126

CS2SAT: THE CONTROL SYSTEMS CYBER SECURITY SELF-ASSESSMENT TOOL  

Science Conference Proceedings (OSTI)

The Department of Homeland Security National Cyber Security Division has developed the Control System Cyber Security Self-Assessment Tool (CS2SAT) that provides users with a systematic and repeatable approach for assessing the cyber-security posture of their industrial control system networks. The CS2SAT was developed by cyber security experts from Department of Energy National Laboratories and with assistance from the National Institute of Standards and Technology. The CS2SAT is a desktop software tool that guides users through a step-by-step process to collect facility-specific control system information and then makes appropriate recommendations for improving the system’s cyber-security posture. The CS2SAT provides recommendations from a database of industry available cyber-security practices, which have been adapted specifically for application to industry control system networks and components. Each recommendation is linked to a set of actions that can be applied to remediate-specific security vulnerabilities.

Kathleen A. Lee

2008-01-01T23:59:59.000Z

127

Hybrid Dynamic Energy and Thermal Management in Heterogeneous Embedded Multiprocessor SoCs  

E-Print Network (OSTI)

Hybrid Dynamic Energy and Thermal Management in Heterogeneous Embedded Multiprocessor SoCs Shervin propose a joint thermal and energy management technique specifically designed for heterogeneous MPSo technique simultaneously reduces the thermal hot spots, temperature gradients, and energy consumption

Simunic, Tajana

128

Systematical Investigations of Cs - 137 Concentration in Soils in Bansko - Razlog Region  

SciTech Connect

Systematical investigations of Cs-137 concentration in soil in Bansko - Razlog region have been performed for the first time on a total area of about 40 km2. By means of high-resolution gamma-ray spectroscopy the radio-nuclide content of soil samples has been determined. The Cs-137 deposition density following the Chernobyl accident has been estimated and compared with results obtained in other countries. The additional dose rate caused by this fallout has been estimated, too.

Kostov, L. K.; Mladenov, Ml. I.; Protochristov, Ch. N.; Stoyanov, Ch. P. [Institute for Nuclear Research and Nuclear Energy, Sofia 1000 (Bulgaria); Kobilarov, R. G. [Department of Applied Physics, Technical University - Sofia, Sofia 1000 (Bulgaria); Kostova, L. G. [HPC - Bulgaria, Sofia 1000 (Bulgaria)

2007-04-23T23:59:59.000Z

129

Development of a Continuous Process to Produce Ti via ...  

Science Conference Proceedings (OSTI)

Presentation Title, Development of a Continuous Process to Produce Ti via Metallothermic Reduction of TiCl4 in Molten Salt. Author(s), David Steyn van Vuuren, ...

130

Fabrication of High Strength Pure Ti Matrix Composite Reinforced ...  

Science Conference Proceedings (OSTI)

Carbon black particles were added for the in situ formation of TiC dispersoids during the SPS process. Sponge and fine Ti powders were coated with carbon ...

131

TiC x N 1-x Eutectic Composite Prepared by  

Science Conference Proceedings (OSTI)

Presentation Title, Microstructure and Mechanical Property of TiB2-TiCxN1-x ... TiB2, TiC and TiN powders in N2 atmosphere at 60  ...

132

Optimization of Ti addition in Fe for Fe-Ti-N thin films  

Science Conference Proceedings (OSTI)

In this work we studied the magnetic and structural properties of Fe{sub 1-x}Ti{sub x}(x=0, 0.02, 0.05, 0.07) thin films prepared with dc-magnetron sputtering. It was found that the inter-atomic spacing increases as the amount of Ti is increased indicating that Ti is getting dissolved substitutionally in Fe lattice. We found that the addition of 5% Ti is best suited for its usage in Fe-Ti-N alloys.

Tayal, Akhil; Gupta, Mukul; Gupta, Ajay; Stahn, Jochen; Horisberger, M. [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, 452001 (India); Laboratory for Neutron Scattering, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland); Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)

2012-06-05T23:59:59.000Z

133

AOCS Official Method Ti 1a-64  

Science Conference Proceedings (OSTI)

Spectrophotometric Determination of Conjugated Dienoic Acid AOCS Official Method Ti 1a-64 Methods and Analyses Methods Downloads Methods Downloads Official Method BE2786ABB98768E1DCF0ACFD1AE2520C MC-TI1A64 16847

134

Stress-induced martensitic transformations in NiTi and NiTi-TiC composites investigated by neutron diffraction  

SciTech Connect

Superelastic NiTi (51.0 at% Ni) with 0, 10 and 20 vol% TiC particles were deformed under uniaxial compression as neutron diffraction spectra were simultaneously obtained. The experiments yielded in-situ measurements of the thermoelastic stress-induced transformation. A detailed Rietveld determination is made of the phase fractions and the evolving strains in the reinforcing TiC particles and the austenite as it transforms to martensite on loading (and its subsequent back transformation on unloading). These strains are used to shed light on the phenomenon of load transfer in composites where the matrix undergoes a stress-induced phase transformation.

Vaidyanathan, R. [Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Materials Science and Engineering; Bourke, M.A.M. [Los Alamos National Lab., NM (United States); Dunand, D.C. [Northwestern Univ., Evanston, IL (United States)

1998-12-31T23:59:59.000Z

135

File:SaltWells CS-FDM.pdf | Open Energy Information  

Open Energy Info (EERE)

SaltWells CS-FDM.pdf SaltWells CS-FDM.pdf Jump to: navigation, search File File history File usage Metadata File:SaltWells CS-FDM.pdf Size of this preview: 448 × 599 pixels. Other resolution: 449 × 600 pixels. Full resolution ‎(838 × 1,120 pixels, file size: 8.08 MB, MIME type: application/pdf) Map showing the CS-FDM survey results performed at Salt Wells by Willowstick Technologies, LLC. Dark shading highlights conductive highs and lightly shaded to white areas highlight conductive lows, which equate to zones of high or low groundwater saturation. From Montgomery et al. (2005) Figure 1. File history Click on a date/time to view the file as it appeared at that time. Date/Time Thumbnail Dimensions User Comment current 11:08, 13 September 2013 Thumbnail for version as of 11:08, 13 September 2013 838 × 1,120 (8.08 MB) Mbennett (Talk | contribs) Map showing the CS-FDM survey results performed at Salt Wells by Willowstick Technologies, LLC. Dark shading highlights conductive highs and lightly shaded to white areas highlight conductive lows, which equate to zones of high or low groundwater satur...

136

The luminescence characteristics of CsI(Na) crystal under {alpha} and X/{gamma} excitation  

SciTech Connect

In this paper, we study the effective decay time characteristic of CsI(Na) crystal under {sup 239}Pu alpha particle and {sup 137}Cs gamma-ray excitation using a single photon counting decay time measurement system. The measurement system employs a silicon optical fiber to couple and transit single photon. The slow decay time component of CsI(Na) crystal is 460-550 ns. We observe a 15 ns fast decay component under alpha particle excitation. In addition, we find that the primary stage of the falling edge in the decay time curve is non-exponential and drops rapidly when CsI(Na) crystal is excited by {sup 239}Pu alpha particles. Since the high density of self-trapped-excitons (STEs) is produced in alpha particle excitation process, we propose that the fast falling edge is corresponding to the quenching process of STEs which transit with non-radiation in the case of high excitation density. To prove this proposal, we excited the CsI(Na) crystal with sub-nanosecond intensive pulsed X-ray radiation. Our X-ray impinging results show that the fast falling edge also exists under low energy (average 100 keV) bremsstrahlung X-ray excitation.

Liu Jinliang [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China); Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China); Liu Fang [Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China); School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206 (China); Ouyang Xiaoping [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China); Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China); School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206 (China); Liu Bin [School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206 (China); Chen Liang; Ruan Jinlu; Zhang Zhongbing; Liu Jun [Radiation Detection Research Center, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024 (China)

2013-01-14T23:59:59.000Z

137

Tunable dipolar resonances and Einstein-de Haas effect in a {sup 87}Rb-atom condensate  

Science Conference Proceedings (OSTI)

We theoretically study a spinor condensate of {sup 87}Rb atoms in a F=1 hyperfine state confined in an optical dipole trap. Putting initially all atoms in an m{sub F}=1, component we observe a significant transfer of atoms to other, initially empty Zeeman states exclusively due to dipolar forces. Because of conservation of a total angular momentum the atoms going to other Zeeman components acquire an orbital angular momentum and circulate around the center of the trap. This is a realization of the Einstein-de Haas effect in a system of cold gases. We show that the transfer of atoms via dipolar interactions is possible only when the energies of the initial and the final sates are equal. This condition can be fulfilled utilizing a resonant external magnetic field, which tunes energies of involved states via the linear Zeeman effect. We found that there are many final states of different spatial density, which can be tuned selectively to the initial state. We show a simple model explaining high selectivity and controllability of weak dipolar interactions in the condensate of {sup 87}Rb atoms.

Swislocki, Tomasz; Sowinski, Tomasz; Pietraszewicz, Joanna; Gajda, Mariusz [Instytut Fizyki PAN, Al. Lotnikow 32/46, PL-02-668 Warszawa (Poland); Brewczyk, Miroslaw [Wydzial Fizyki, Uniwersytet w Bialymstoku, ul. Lipowa 41, PL-15-424 Bialystok (Poland); Lewenstein, Maciej [ICFO, Institut de Ciences Fotoniques, Parc Mediterrani de la Tecnologia, E-08860 Castelldefels, Barcelona (Spain); ICREA, Institucio Catalana de Recerca i Estudis Avancats, E-08010 Barcelona (Spain); Zakrzewski, Jakub [Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ul. Reymonta 4, PL-30-059 Krakow (Poland); Mark Kac Complex Systems Research Center, Jagiellonian University, ul. Reymonta 4, PL-30-059 Krakow (Poland)

2011-06-15T23:59:59.000Z

138

A Search for a Light Charged Higgs Boson Decaying to cs at ?s = 7 TeV.  

E-Print Network (OSTI)

??A search for a light charged Higgs boson decaying into cs is presented using data recorded in pp collisions at ?s = 7 TeV. The… (more)

Martyniuk, Alex Christopher

2011-01-01T23:59:59.000Z

139

Phase Field Simulation of Ni4Ti3 Precipitation in Porous NiTi Shape ...  

Science Conference Proceedings (OSTI)

Generally, porous NiTi alloys may undergo thermomechnical treatment which .... of First Derivative of Dilatation in Low Carbon Steels Multi-Phase Presenting.

140

Low Cost TiOLow Cost TiO22 NanoparticlesNanoparticles  

uniform TiO2 nanoparticles show great potential in numerous markets, including lighting, signage, automotive and solar energy for their excellent

Note: This page contains sample records for the topic "ti rb cs" 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

Synthesis of Ti/TiC Composites by Mechanical Milling Followed by ...  

Science Conference Proceedings (OSTI)

carbon nanotubes were subjected to high energy ball milling followed by spark plasma sintering (SPS) to synthesize Ti composite reinforced with in-situ formed ...

142

Hydrothermal Growth of the TiO2 Nanowire Array on Ti Plates for the ...  

Science Conference Proceedings (OSTI)

Applications of the aligned TiO2 nanowire array were studied in both the photoanalytic mineralization of acetone, benzene and dye molecules in water and the ...

143

Internal conversion coefficients in (134)Cs, (137)Ba, and (139)La: A precise test of theory  

E-Print Network (OSTI)

Recently we measured the ratio of K-shell internal conversion coefficients, alpha(K), for the 127.5-keV E3 transition in (134)Cs and the 661.7-keV M4 transition in (137)Ba. We here report a measurement of the 165.9-keV M1 transition in (139)La, based on which we convert our earlier ratio measurement into individual aK values for the transitions in (134)Cs and (137)Ba. These results continue to confirm the Dirac-Fock calculations of internal conversion coefficients that incorporate the atomic K-shell vacancy.

Nica, N.; Hardy, John C.; Iacob, V. E.; Balonek, C.; Trzhaskovskaya, M. B.

2008-01-01T23:59:59.000Z

144

Acoustic Noise Test Report for the Viryd CS8 Wind Turbine  

DOE Green Energy (OSTI)

This report summarizes the results of an acoustic noise test that the National Renewable Energy Laboratory (NREL) conducted on the Viryd CS8 wind turbine. This test was conducted in accordance with the International Electrotechnical Commission's (IEC) standard, Wind Turbine Generator Systems Part 11: Acoustic Noise Measurement Techniques, IEC 61400-11 Ed.2.1, 2006-11. However, because the Viryd CS8 is a small turbine, as defined by IEC, NREL used 10-second averages instead of 60-second averages and binning by wind speed instead of regression analysis.

Roadman, J.; Huskey, A.

2013-07-01T23:59:59.000Z

145

A comparison of 137 Cs radioactivity in localized evergreen and deciduous plant species  

E-Print Network (OSTI)

A vegetation study at the Comanche Peak Steam Electric Station (CPSES) near Glen Rose, Texas was conducted in 1991 and 1992. The CPSES is a commercial nuclear power plant owned and operated by Texas Utilities Electric of Dallas, Texas. The U.S. Nuclear Regulatory Commission (USNRC) requires the CPSES to routinely sample broadleaf vegetation in place of milk samples. Few commercial dairies exist in the vicinity. Broadleaf tree species are scarce because the climate and local limestone geology, have produced a dry rolling hill topography. An evergreen juniper is the dominant tree species. Few broadleaves during the winter season have hindered year117CS round sampling. This study compares the environmental concentrations between broadleaf and evergreen foliage at CPSES. Soil 117CS concentrations from each vegetation location were also compared to the foliage 137CS concentrations. The study's objective was to determine if the deciduous and evergreen vegetation 137CS concentrations are statistically the same. If the concentrations are statistically the same, then a recommendation could be made to the CPSES for substitution of leaf type sampled. Broadleaf tree leaf samples were collected on and off CPSES. Evergreen leaf samples were collected in close proximity to broadleaf samples. The leaf and soil samples were dried and homogenized for analysis. Gamma-ray spectrometry was performed to measure 137Cs radioactivity in each leaf and soil sample. The 137CS concentrations for each leaf and soil sample were calculated and statistically compared. The mean values of the 137CS concentrations in broadleaf and evergreen foliage samples were found to be statistically the same and therefore from the same population. The individual soil sample 137CS concentration means were also statistically the same and from its own population. The foliage and soil populations, although, were found to be statistically different. This study's conclusion is that evergreen leaves from juniper trees can be used to supplement and/or substitute for the broadleaf samples-currently collected. This study may be used by CPSES to petition the USNRC for a modification of the current environmental sampling program. A change in foliage collection would allow the CPSES to better satisfy its environmental sampling regulatory requirements.

Rangel, Ruben Canales

1996-01-01T23:59:59.000Z

146

Glass-wool study of laser-induced spin currents en route to hyperpolarized Cs salt  

SciTech Connect

The nuclear spin polarization of optically pumped Cs atoms flows to the surface of Cs hydride in a vapor cell. A fine glass wool lightly coated with the salt helps greatly increase the surface area in contact with the pumped atoms and enhance the spin polarization of the salt nuclei. Even though the glass wool randomly scatters the pump light, the atomic vapor can be polarized with unpolarized light in a magnetic field. The measured enhancement in the salt enables study of the polarizations of light and atomic nuclei very near the salt surface.

Ishikawa, Kiyoshi [Graduate School of Material Science, University of Hyogo, Ako-gun, Hyogo 678-1297 (Japan)

2011-07-15T23:59:59.000Z

147

Thermal and Flow Engineering Laboratory course 424512 E Ron Zevenhoven c.s.  

E-Print Network (OSTI)

Thermal and Flow Engineering Laboratory course 424512 E Ron Zevenhoven c.s. April 2012 Exercises I of II ­ Numerical fluid dynamics 1. A tornado can be modelled as a steady, incompressible flow : rCv rCv v r x / / 2 1 0 where C1 and C2 are constants. a. Show that this model satisfies

Zevenhoven, Ron

148

Thermal and Flow Engineering Laboratory course 424512 E Ron Zevenhoven c.s.  

E-Print Network (OSTI)

Thermal and Flow Engineering Laboratory course 424512 E Ron Zevenhoven c.s. April 2013 Exercises I of II ­ Numerical fluid dynamics 1. A tornado can be modelled as a steady, incompressible flow : rCv rCv v r x / / 2 1 0 where C1 and C2 are constants. a. Show that this model satisfies

Zevenhoven, Ron

149

Data Warehouse (DW) Maturity Assessment Questionnaire Catalina Sacu -csacu@students.cs.uu.nl  

E-Print Network (OSTI)

Data Warehouse (DW) Maturity Assessment Questionnaire Catalina Sacu - csacu@students.cs.uu.nl Marco;2 The DW Maturity Assessment Questionnaire Catalina Sacu1 ­ caitlin.shacu@gmail.com, Marco Spruit1 - m presents the data warehouse (DW) maturity assessment questionnaire developed by (Sacu et al., 2010) as part

Utrecht, Universiteit

150

An academic kit for integrating mobile devices into the CS curriculum  

Science Conference Proceedings (OSTI)

In this paper we present our freely available academic kit to help universities in integrating mobile devices into the Computer Science (CS) curriculum. The kit was designed and developed at the Centre for Mobile Education and Research at the University ... Keywords: blackberry, mobile application development, mobile devices, programming for fun, teaching computer programming, teaching tools

Qusay H. Mahmoud; Thanh Ngo; Razieh Niazi; Pawel Popowicz; Robert Sydoryshyn; Matthew Wilks; Dave Dietz

2009-07-01T23:59:59.000Z

151

Does studio-based instruction work in CS 1?: an empirical comparison with a traditional approach  

Science Conference Proceedings (OSTI)

Given the increasing importance of communication, teamwork, and critical thinking skills in the computing profession, we believe there is good reason to provide students with increased opportunities to learn and practice those skills in undergraduate ... Keywords: code inspection, cs1, pedagogical code review, peer review, studio-based learning and instruction

Christopher Hundhausen; Anukrati Agrawal; Dana Fairbrother; Michael Trevisan

2010-03-01T23:59:59.000Z

152

Power Performance Test Report for the Viryd CS8 Wind Turbine  

DOE Green Energy (OSTI)

This report contains the results of the power performance test that was performed on a Viryd CS8 wind turbine as part of the DOE Independent Testing project. The test is an accredited test to the IEC 61400-12-1 power performance standard.

Roadman, J.; Murphy, M.; van Dam, J.

2012-12-01T23:59:59.000Z

153

Light response of pure CsI calorimeter crystals painted with wavelength-shifting lacquer  

E-Print Network (OSTI)

We have measured scintillation properties of pure CsI crystals used in the shower calorimeter built for a precise determination of the pi+ -> pi0 e+ nu decay rate at the Paul Scherrer Institute (PSI). All 240 individual crystals painted with a special wavelength-shifting solution were examined in a custom-build detection apparatus (RASTA=radioactive source tomography apparatus) that uses a 137Cs radioactive gamma source, cosmic muons and a light emitting diode as complementary probes of the scintillator light response. We have extracted the total light output, axial light collection nonuniformities and timing responses of the individual CsI crystals. These results predict improved performance of the 3 pi sr PIBETA calorimeter due to the painted lateral surfaces of 240 CsI crystals. The wavelength-shifting paint treatment did not affect appreciably the total light output and timing resolution of our crystal sample. The predicted energy resolution for positrons and photons in the energy range of 10-100 MeV was nevertheless improved due to the more favorable axial light collection probability variation. We have compared simulated calorimeter ADC spectra due to 70 MeV positrons and photons with a Monte Carlo calculation of an ideal detector light response.

E. Frlez; Ch. Broennimann; B. Krause; D. Pocanic; D. Renker; S. Ritt; P. L. Slocum; I. Supek; H. P. Wirtz

2000-06-21T23:59:59.000Z

154

CS 6100 Program 1 Mars Explorer (20 points) Due Feb 3, 2011  

E-Print Network (OSTI)

scenario was presented by L Steels. The objectives are to explore a distant planet, and in particularCS 6100 Program 1 Mars Explorer (20 points) Due Feb 3, 2011 Create an applet (or other visual program) which allows the user to see the behavior of reactive agents. The Mars Explorer

Allan, Vicki H.

155

Suppression of the stellar enhancement factor and the reaction {sup 85}Rb(p,n){sup 85}Sr  

SciTech Connect

It is shown that a Coulomb suppression of the stellar enhancement factor occurs in many endothermic reactions at and far from stability. Contrary to common assumptions, reaction measurements for astrophysics with minimal impact of stellar enhancement should be preferably performed for those reactions instead of their reverses, despite of their negative Q value. As a demonstration, the cross section of the astrophysically relevant {sup 85}Rb(p,n){sup 85}Sr reaction has been measured by activation between 2.16{<=}E{sub c.m.}{<=}3.96 MeV and the astrophysical reaction rates at p process temperatures for (p,n) as well as (n,p) are directly inferred from the data. Additionally, our results confirm a previously derived modification of a global optical proton potential. The presented arguments are also relevant for other {alpha}- and proton-induced reactions in the p, rp, and {nu}p processes.

Rauscher, T. [Department of Physics, University of Basel, CH-4056 Basel (Switzerland); Kiss, G. G.; Gyuerky, Gy.; Simon, A.; Fueloep, Zs.; Somorjai, E. [Institute of Nuclear Research (ATOMKI), H-4001 Debrecen, P. O. Box 51 (Hungary)

2009-09-15T23:59:59.000Z

156

Distributed Cloud Storage Services with FleCS Containers Hobin Yoon, Madhumitha Ravichandran, Ada Gavrilovska, Karsten Schwan  

E-Print Network (OSTI)

and accessible storage ser- vices across such distributed infrastructure. To address these issues, we propose and explore the utility of FleCS ­ an approach for providing FLExible Cloud Storage services in distributed systems. FleCS provides stor- age containers as a cloud-level abstraction that uniquely identifies

Gavrilovska, Ada

157

TiSol | Open Energy Information  

Open Energy Info (EERE)

TiSol TiSol Jump to: navigation, search Name TiSol Place Pasadena, California Sector Solar Product California-based start up focused on the production of dye sensitized solar cells. Coordinates 29.690847°, -95.196308° 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":29.690847,"lon":-95.196308,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

158

Economic analysis: impact of CS/R process on benzene market  

SciTech Connect

Contract No. DE-AC01-78ET10159 (formerly ET-78-C-01-3117) between UOP/SDC and the United States Department of Energy (DOE) requires UOP/SDC to provide specific engineering and technical services to the DOE Office of Coal Processing in support of the Coal Gasification Program. This report covers an economic study on the projected price of benzene through the next decade based on the market factors and production costs. The impact of the CS/R process on the benzene market was evaluated. In addition, the cost of gas from the CS/R process was determined as a function of the byproduct credit for benzene.

Spielberger, L.; Klein, J.

1981-05-01T23:59:59.000Z

159

Chernobyl {sup 137}Cs used to determine sediment accretion rates at selected northern European coastal wetlands  

SciTech Connect

Sediment cores were collected form five coastal wetlands along the North Sea (England and Netherlands) and Baltic Sea (Poland). {sup 137}Cs dating was used to assess sediment accretion rates, including rates based on the {sup 137}Cs peak from the 1986 accident at Chernobyl. Peaks form the Chernobyl fallout were found in cores from the Oder and Vistula Rivers in Poland, from the Eastern Scheldt in the Netherlands, and in one of the two cores from Stiffkey Marsh, UK. No evidence of Chernobyl fallout was found in cores from Dengie Marsh, UK. The Chernobyl {sup 137}Cs peak serves as an excellent marker for short-term accretion rates because of its high activity. Vertical accretion rates (cm yr{sup {minus}1}) based on 1963 and 1986 peaks were similar at most sites; differences may be due to large inputs of sediment from storms or recent accumulation of organic matter. Large differences in sediment characteristics and accretion rates were found between samples from Poland and western Europe. Vertical accretion rates over the period 1963-1986 ranged from 0.26 to 0.85 cm{sup {minus}1} and from 0.30 to 1.90 cm yr{sup {minus}1} over the 1986-1991 period. Vertical accretion rates for the period these sites are in imminent danger of excessive flooding. The Chernobyl {sup 137}Cs peak will be especially useful for studies of short-term (i.e. very recent) sedimentation in the near future and for comparisons of sediment processes over different time scales. 33 refs., 4 figs., 4 tabs.

Callaway, J.C.; DeLaune, R.D.; Patrick, W.H. Jr. [Louisiana State Univ., Baton Rouge, LA (United States)

1996-05-01T23:59:59.000Z

160

CS Wu  

Science Conference Proceedings (OSTI)

... University in 1944. As a nuclear physicist Dr. Wu worked on the Manhattan Project during the second World War. She became a ...

Note: This page contains sample records for the topic "ti rb cs" 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

Effects of thermal and quantum fluctuations on the phase diagram of a spin-1 {sup 87}Rb Bose-Einstein condensate  

Science Conference Proceedings (OSTI)

We investigate the effects of thermal and quantum fluctuations on the phase diagram of a spin-1 {sup 87}Rb Bose-Einstein condensate (BEC) under the quadratic Zeeman effect. Due to the large ratio of spin-independent to spin-dependent interactions of {sup 87}Rb atoms, the effect of noncondensed atoms on the condensate is much more significant than that in scalar BECs. We find that the condensate and spontaneous magnetization emerge at different temperatures when the ground state is in the broken-axisymmetry phase. In this phase, a magnetized condensate induces spin coherence of noncondensed atoms in different magnetic sublevels, resulting in temperature-dependent magnetization of the noncondensate. We also examine the effect of quantum fluctuations on the order parameter at absolute zero and find that the ground-state phase diagram is significantly altered by quantum depletion.

Phuc, Nguyen Thanh; Kawaguchi, Yuki [Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Ueda, Masahito [Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); ERATO Macroscopic Quantum Control Project, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

2011-10-15T23:59:59.000Z

162

Polymorphic single crystal {r_reversible} single crystal transition in K{sub 0.975}Rb{sub 0.025}NO{sub 3}  

Science Conference Proceedings (OSTI)

Polymorphic transformations in K{sub 0.975}Rb{sub 0.025}NO{sub 3} single crystals have been investigated by optical microscopy and X-ray diffraction. The equilibrium temperature between modifications II and III has been determined. It is established that the crystal growth at II {r_reversible} III polymorphic transitions is accompanied by the formation and growth of daughter-modification nuclei in the matrix crystal.

Asadov, Yu. G., E-mail: yusifasadov@rambler.ru; Nasirov, E. V. [Azerbaijan National Academy of Sciences, Institute of Physics (Azerbaijan)

2010-09-15T23:59:59.000Z

163

Ecological half-life of 137Cs in fish from a stream contaminated by nuclear reactor effluents  

SciTech Connect

Radiocesium ({sup 137}Cs) concentrations were determined during 1974, 1981 and 1998 for seven species of fish inhabiting a stream (Steel Creek) contaminated by effluents from a nuclear reactor to examine the decline of this radionuclide in a natural ecosystem. Median {sup 137}Cs concentrations were highest in Micropterus salmoides (largemouth bass) during each year of the investigation (1974 = 6.67 Bq g{sup -1} dry wt. of whole body; 1981 = 3.72 Bq g{sup -1}; 1998 = 0.35 Bq g{sup -1}), but no patterns of differences were observed among Aphredoderus sayanus (pirate perch), Esox americanus (redfin pickerel), Lepomis auritus (redbreast sunfish), L. gulosus (warmouth), L. punctatus (spotted sunfish), and Notropis cummingsae (dusky shiner). Results demonstrated a rapid decline in {sup 137}Cs within fish from Steel Creek during the 24-year period. For example, {sup 137}Cs concentrations in all fish species declined significantly among years, even after accounting for radioactive decay. The observed percent declines in {sup 137}Cs concentrations of individual species were 3-4 times greater between 1974 and 1981 compared to that expected by physical decay alone, and 2-3 times greater during 1981-1998. Ecological half-lives (EHLs) of {sup 137}Cs in fish ranged from 4.43 years in A. sayanus to 6.53 years in L. gulosus. The EHL for {sup 137}Cs in all fish species combined was 5.54 years. Current levels of {sup 137}Cs in fish from Steel Creek (1.16 Bq g{sup -1} dry wt. of whole body to below detection limits) indicate that the consumption of fish from this ecosystem poses little risk to humans and sensitive wildlife species. These results demonstrate the importance of incorporating the concept of ecological half-life into determinations concerning the length and severity of potential risks associated with radiocontaminants.

Peles, J. [Pennsylvania State University, McKeesport; BryanJr, A. [Savannah River Ecology Lab; Garten Jr, Charles T [ORNL; Ribble, D. [Trinity University; Smith, M. [Savannah River Ecology Lab

2000-12-01T23:59:59.000Z

164

Long-Term Reduction in 137Cs Concentration in Food Crops on Coral Atolls Resulting from Potassium Treatment  

SciTech Connect

Bikini Island was contaminated March 1, 1954 by the Bravo detonation (U.S nuclear test series, Castle) at Bikini Atoll. About 90% of the estimated dose from nuclear fallout to potential island residents is from cesium-137 ({sup 137}Cs) transferred from soil to plants that are consumed by residents. Thus, radioecology research efforts have been focused on removing {sup 137}Cs from soil and/or reducing its uptake into vegetation. Most effective was addition of potassium (K) to soil that reduces {sup 137}Cs concentration in fruits to 3-5% of pretreatment concentrations. Initial observations indicated this low concentration continued for some time after K was last applied. Long-term studies were designed to evaluate this persistence in more detail because it is very important to provide assurance to returning populations that {sup 137}Cs concentrations in food (and, therefore, radiation dose) will remain low for extended periods, even if K is not applied annually or biennially. Potassium applied at 300, 660, 1260, and 1970 kg ha{sup -1} lead to a {sup 137}Cs concentration in drinking coconut meat that is 34, 22, 10, and about 4 % of original concentration, respectively. Concentration of {sup 137}Cs remains low 8 to 10 y after K is last applied. An explanation for this unexpected result is discussed.

Robison, W; Stone, E; Hamilton, T; Conrado, C

2005-04-08T23:59:59.000Z

165

APPLICATION OF BAYESIAN AND GEOSTATISTICAL MODELING TO THE ENVIRONMENTAL MONITORING OF CS-137 AT THE IDAHO NATIONAL LABORATORY  

SciTech Connect

At the Idaho National Laboratory (INL) Cs-137 concentrations above the U.S. Environmental Protection Agency risk-based threshold of 0.23 pCi/g may increase the risk of human mortality due to cancer. As a leader in nuclear research, the INL has been conducting nuclear activities for decades. Elevated anthropogenic radionuclide levels including Cs-137 are a result of atmospheric weapons testing, the Chernobyl accident, and nuclear activities occurring at the INL site. Therefore environmental monitoring and long-term surveillance of Cs-137 is required to evaluate risk. However, due to the large land area involved, frequent and comprehensive monitoring is limited. Developing a spatial model that predicts Cs-137 concentrations at unsampled locations will enhance the spatial characterization of Cs-137 in surface soils, provide guidance for an efficient monitoring program, and pinpoint areas requiring mitigation strategies. The predictive model presented herein is based on applied geostatistics using a Bayesian analysis of environmental characteristics across the INL site, which provides kriging spatial maps of both Cs-137 estimates and prediction errors. Comparisons are presented of two different kriging methods, showing that the use of secondary information (i.e., environmental characteristics) can provide improved prediction performance in some areas of the INL site.

Kara G. Eby

2010-08-01T23:59:59.000Z

166

Measurement of the 44Ti(alpha,p)47V reaction cross section, of relevance to gamma-ray observation of core collapse supernovae, using reclaimed 44Ti.  

E-Print Network (OSTI)

Measurement of the 44Ti(alpha,p)47V reaction cross section, of relevance to gamma-ray observation of core collapse supernovae, using reclaimed 44Ti.

Murphy, AStJ; Ayranov, M; Bastin, B; Bemmerer, D; Bingham, R; Bunka, M; Butler, P; Catherall, R; Cocolios, TE; Davinson, T; Delahaye, P; Dorsival, A; Dressler, R; van Duppen, P; Fallis, J; Fox, S; Fulton, BR; Kowalska, M; Laird, A; Lotay, G; Saint Laurent, MG; Marin, A; Mendonca1, JT; de Oliveira, F; Roger, T; Ruiz, C; Sahin, L; Schumann, D; de Sereville1, N; Sorlin, O; Stora, T; Traykov, E; Voulot, D; Wang, C HT; Wenander, FJC; Woods, PJ

2012-01-01T23:59:59.000Z

167

Test of internal-conversion theory with measurements in Cs-134 and Ba-137  

E-Print Network (OSTI)

We have measured the ratio of K-shell internal conversion coefficients, alpha(K), for the 127.5-keV E3 transition in Cs-134 and the 661.7-keV M4 transition in Ba-137. Previous measurements of these alpha(K) values led to a ratio that differed from calculated internal conversion coefficients. Our measured result, 30.01(15), disagrees with, but is a factor of three more precise than, the previous average of all experimental results. Our new result is consistent with calculations.

Nica, N.; Hardy, John C.; Iacob, V. E.; Rockwell, W. E.; Trzhaskovskaya, M. B.

2007-01-01T23:59:59.000Z

168

E-Beam Electron Mobility Study on CZT and CsI  

Science Conference Proceedings (OSTI)

There is much interest in developing new scintillator detectors for radiation detection and radiographic imaging applications. The knowledge of the electron mobility ({mu}) is important in the basic understanding of charge transport and in the selection and optimization of many inorganic scintillator materials such as thallium-doped cesium iodide, CsI(Tl). Performance measures are used to model various scintillator responses in an effort to predict the effect of doping concentrations. Performance models will help in the new scintillator design process. Initial tests are done with cadmium zinc telluride detectors to establish measurement techniques and baselines.

Baker, S., Dreesen, W., Schwellenbach, D., Young, J., Burger, A., Groza, M., Franks, L.

2011-09-01T23:59:59.000Z

169

A Review Corrosion of TI Grade 7 and Other TI Alloys in Nuclear Waste Repository Environments  

DOE Green Energy (OSTI)

Titanium alloy degradation modes are reviewed in relation to their performance in repository environments. General corrosion, localized corrosion, stress corrosion cracking, hydrogen induced cracking, microbially influenced corrosion, and radiation-assisted corrosion of Ti alloys are considered. With respect to the Ti Grade 7 drip shields selected for emplacement in the repository at Yucca Mountain, general corrosion, hydrogen induced cracking, and radiation-assisted corrosion will not lead to failure within the 10,000 year regulatory period; stress corrosion cracking (in the absence of disruptive events) is of no consequence to barrier performance; and localized corrosion and microbially influenced corrosion are not expected to occur. To facilitate the discussion, Ti Grades 2, 5, 7, 9, 11, 12, 16, 17, 18, and 24 are included in this review.

F. Hua; K. Mon; P. Pasupathi; G. Gordon

2004-05-11T23:59:59.000Z

170

Structural Competition and Phase Transformations in Binary Ti-Nb ...  

Science Conference Proceedings (OSTI)

Structural Competition and Phase Transformations in Binary Ti-Nb Alloys for Biomedical Applications · Structure and Fracture Resistance of Armored Fish Scales.

171

Novel and NiTi-based Shape Memory Alloys  

Science Conference Proceedings (OSTI)

Mar 4, 2013 ... Phase Constitution, Mechanical and Shape Memory Properties of (Pt,Co)Ti Alloys: Hideki Hosoda1; Satoshi Tsutsumi1; Masaki Tahara1; ...

172

Morphological Evaluation of Osteoblast-TiO2 Nanotube Interfaces  

Science Conference Proceedings (OSTI)

A Comparative Study of the Compressive Mechanical Properties of Young and ... of Ti-6Al-4V for Medical Applications after Surface Modification by Anodization.

173

Stress Corrosion Cracking Threshold of Ti 6-4 Extrusions  

Science Conference Proceedings (OSTI)

Ti 6Al-4V extrusions with standard chemistry and extra low interstitial are evaluated for their stress corrosion cracking resistance. Also examined is the affect of ...

174

Processing and Mechanical Properties of Ti foams - Programmaster ...  

Science Conference Proceedings (OSTI)

Presentation Title, Processing and Mechanical Properties of Ti foams. Author(s), Faming Zhang, Eileen Otterstein, Eberhard Burkel. On-Site Speaker (Planned) ...

175

Electrical Conductance of Single TiO2 Nanotube Devices  

Science Conference Proceedings (OSTI)

As fabricated TiO2 nanotubes with different wall thicknesses were annealed either in ... carbon foam saturated with SiO2 aerogel for heat insulation purposes.

176

Emerging Robust Beta Gamma TiAl Alloys  

Science Conference Proceedings (OSTI)

Recently a new class of TiAl based alloy system, called beta gamma, that ... Phase-Field Simulation on Phase Transformation during Creep Deformation in Type ...

177

Atomic Layer Deposition of TiO2  

Science Conference Proceedings (OSTI)

Scanning electron microscopy (SEM) was performed on TiO2-coated nanoporous alumina membranes using an S4700 microscope (Hitachi, Tokyo, Japan) with ...

178

Low Cost TiO2 Nanoparticles - Energy Innovation Portal  

Solar Photovoltaic Advanced Materials Low Cost TiO2 Nanoparticles Sandia National Laboratories. Contact SNL About This Technology Publications: Market ...

179

Lessons Learned in Sputtering TiNi Thin Film  

Science Conference Proceedings (OSTI)

Experimental results have been published in journals and conference proceedings, but as yet TiNi thin film is not commercially available. The author and ...

180

Glass Ceramic Waste Forms for Combined CS+LN+TM Fission Products Waste Streams  

SciTech Connect

In this study, glass ceramics were explored as an alternative waste form for glass, the current baseline, to be used for immobilizing alkaline/alkaline earth + lanthanide (CS+LN) or CS+LN+transition metal (TM) fission-product waste streams generated by a uranium extraction (UREX+) aqueous separations type process. Results from past work on a glass waste form for the combined CS+LN waste streams showed that as waste loading increased, large fractions of crystalline phases precipitated upon slow cooling.[1] The crystalline phases had no noticeable impact on the waste form performance by the 7-day product consistency test (PCT). These results point towards the development of a glass ceramic waste form for treating CS+LN or CS+LN+TM combined waste streams. Three main benefits for exploring glass ceramics are: (1) Glass ceramics offer increased solubility of troublesome components in crystalline phases as compared to glass, leading to increased waste loading; (2) The crystalline network formed in the glass ceramic results in higher heat tolerance than glass; and (3) These glass ceramics are designed to be processed by the same melter technology as the current baseline glass waste form. It will only require adding controlled canister cooling for crystallization into a glass ceramic waste form. Highly annealed waste form (essentially crack free) with up to 50X lower surface area than a typical High-Level Waste (HLW) glass canister. Lower surface area translates directly into increased durability. This was the first full year of exploring glass ceramics for the Option 1 and 2 combined waste stream options. This work has shown that dramatic increases in waste loading are achievable by designing a glass ceramic waste form as an alternative to glass. Table S1 shows the upper limits for heat, waste loading (based on solubility), and the decay time needed before treatment can occur for glass and glass ceramic waste forms. The improvements are significant for both combined waste stream options in terms of waste loading and/or decay time required before treatment. For Option 1, glass ceramics show an increase in waste loading of 15 mass % and reduction in decay time of 24 years. Decay times of {approx}50 years or longer are close to the expected age of the fuel that will be reprocessed when the modified open or closed fuel cycle is expected to be put into action. Option 2 shows a 2x to 2.5x increase in waste loading with decay times of only 45 years. Note that for Option 2 glass, the required decay time before treatment is only 35 years because of the waste loading limits related to the solubility of MoO{sub 3} in glass. If glass was evaluated for similar waste loadings as those achieved in Option 2 glass ceramics, the decay time would be significantly longer than 45 years. These glass ceramics are not optimized, but already they show the potential to dramatically reduce the amount of waste generated while still utilizing the proven processing technology used for glass production.

Crum, Jarrod V.; Turo, Laura A.; Riley, Brian J.; Tang, Ming; Kossoy, Anna; Sickafus, Kurt E.

2010-09-23T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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

Proton conductivity of CsH{sub 2}PO{sub 4}WPA composites at intermediate temperatures  

SciTech Connect

CsH{sub 2}PO{sub 4} and H{sub 3}PW{sub 12}O{sub 40}6H{sub 2}O (WPA6H{sub 2}O) were mechanically milled by using planetary ball mill to obtain xCsH{sub 2}PO{sub 4}--(1-x)WPA6H{sub 2}O(%mol) composites. Characterizations of the composites indicate that there were changes of structure of CsH{sub 2}PO{sub 4}WPA composite after mechanical milling. {sup 1}H MAS NMR measurements suggested a hydrogen bond was newly developed between CsH{sub 2}PO{sub 4} and WPA which correlated with conductivity of the composites. 95CsH{sub 2}PO{sub 4}5WPA shows the highest conductivity at 70-170 deg. C range of temperature. The mechanical milling succeed to increase the conductivity under non-humidified atmosphere and intermediate temperature.

Insani, Evan Kamaratul [Department of Material Science, Toyohashi University of Technology, Toyohashi, Aichi 441-8580 (Japan); Department of Engineering Physics, Institut Teknologi Bandung, Bandung, West Java 40132 (Indonesia); Nguyen, Van H.; Kawamura, Go; Hamagami, Jun-ichi; Sakai, Mototsugu; Matsuda, Atsunori [Department of Material Science, Toyohashi University of Technology, Toyohashi, Aichi 441-8580 (Japan); Yuliarto, Brian [Department of Engineering Physics, Institut Teknologi Bandung, Bandung, West Java 40132 (Indonesia)

2010-10-24T23:59:59.000Z

182

Experimental and theoretical investigations of Cs-Ba vapor tacitron inverter for power conditioning in space power systems  

SciTech Connect

The operation characteristics of the Cs-Ba tacitron as a switch are investigated experimentally in three modes: (a) breakdown mode, (b) I-V mode, and (c) current modulation mode. The switching frequency, grid potentials for ignition and extinguishing of discharge, and the Cs pressure and emission conditions (Ba pressure and emitter temperature) for stable current modulation are determined. The experimental data is also used to determine the off-time required for successful ignition, and the effects of the aforementioned operation parameters on the ignition duty cycle threshold for stable modulation. Operation parameters measured include switching frequency up to 20 kHz, hold-off voltage up to 180 V, current densities in excess of 15 A/cm[sup 2], switch power density of 1 kW/cm[sup 2]. and a switching efficiency in excess of 90% at collector C: realer than 30 V. The voltage drop strongly depends on the Cs pressure and to a lesser extent on the emission conditions. Increasing the Cs pressure and/or the emission current lowers the voltage drop, however, for the same initial Cs pressure and emission conditions, the voltage drop in the I-V mode is usually lower than that during current modulation. As long as the discharge current is kept lower that the.emission current, the voltage drop during stable current modulation could be as low as 3 V.

El-Genk, M.; Murray, C.; Wernsman, B.

1993-01-01T23:59:59.000Z

183

Synthesis of CdSe -- TiO2 Nanocomposites and Their Applications to TiO2 Sensitized Solar Cells  

Science Conference Proceedings (OSTI)

CdSe-TiO{sub 2} nanocomposites were synthesized via aminolysis of Ti-oleate complexes in the presence of CdSe nanocrystals, and their application as sensitizers for TiO{sub 2} solar cells was investigated. The formation of CdSe-TiO{sub 2} nanocomposites was confirmed using transmission electron microscopy and Raman spectroscopy. The emission spectrum of CdSe-TiO{sub 2} nanocomposites revealed photoinduced charge separation at the CdSe-TiO{sub 2} interface of the composite. The photocurrent-voltage properties of CdSe-TiO{sub 2}-sensitized TiO{sub 2} particle films compared favorably with those of CdSe-sensitized TiO{sub 2} films. Evidence was also found indicating that the TiO{sub 2} component of the composite protects CdSe against degradation during film annealing.

Kim, J. Y.; Choi, S. B.; Noh, J. H.; HunYoon, S.; Lee, S.; Noh, T. H.; Frank, A. J.; Hong, K. S.

2009-01-01T23:59:59.000Z

184

The X$^1\\Sigma^+$ and a$^3\\Sigma^+$ states of LiCs studied by Fourier-transform spectroscopy  

E-Print Network (OSTI)

We present the first high-resolution spectroscopic study of LiCs. LiCs is formed in a heat pipe oven and studied via laser-induced fluorescence Fourier-transform spectroscopy. By exciting molecules through the X$^1\\Sigma^+$-B$^1\\Pi$ and X$^1\\Sigma^+$-D$^1\\Pi$ transitions vibrational levels of the X$^1\\Sigma^+$ ground state have been observed up to 3cm^{-1} below the dissociation limit enabling an accurate construction of the potential. Furthermore, rovibrational levels in the a$^3\\Sigma^+$ triplet ground state have been observed because the excited states obtain sufficient triplet character at the corresponding excited atomic asymptote. With the help of coupled channels calculations accurate singlet and triplet ground state potentials were derived reaching the atomic ground state asymptote and allowing first predictions of cold collision properties of Li + Cs pairs.

Staanum, P; Pashov, A; Tiemann, E; Knoeckel, Horst; Pashov, Asen; Staanum, Peter; Tiemann, Eberhard

2007-01-01T23:59:59.000Z

185

Observation of cold Rb{sub 2} molecules trapped in an optical dipole trap using a laser-pulse-train technique  

SciTech Connect

In this work, we have developed and characterized a laser-pulse-train technique to observe cold Rb{sub 2} molecules trapped in an optical dipole trap. The molecules are produced in a magneto-optical trap, and then loaded into a crossed optical dipole trap. The time evolution of the molecular population is obtained by applying a laser pulse train, which photoionizes the ground-state molecules through intermediate molecular bands. Our results show that this technique allows us to obtain a faster data acquisition rate of the time evolution of the molecule population than other techniques.

Menegatti, Carlos R.; Marangoni, Bruno S.; Marcassa, Luis G. [Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Caixa Postal 369, 13560-970, Sao Carlos, SP (Brazil)

2011-11-15T23:59:59.000Z

186

ST/EL and ST/CV services for TI2 & TI8 LHC injection tunnels  

E-Print Network (OSTI)

This paper describes the ST/EL and ST/CV services for TI2 & TI8 LHC injection tunnels. The cooling and ventilation part describes the requirements for design and installation of more than 10 km of pipeline that is going to be laid down in the tunnels. Main operating parameters as well as manufacture procedures are explained. Preliminary work schedule with the cost estimate is also presented. Electrical power will be distributed from the LHC side and the SPS side for the machine and the general services. All power converters will be installed on surface buildings. The link between the main bend converters and the main bend magnets will be realised with water-cooled cables. Rest of the magnets will be cabled by using conventional copper and aluminium cables. Due to long lengths of the injection tunnels a dry 18kV transformer will be installed in TJ8 to serve the general services for TI8. The same will apply to TI2 by installing a transformer at the bottom of the PMI2 shaft.

Akhtar, S; CERN. Geneva. ST Division

2002-01-01T23:59:59.000Z

187

Influence of biologically-active substances on {sup 137}Cs and heavy metals uptake by Barley plant  

SciTech Connect

Available in abstract form only. Full text of publication follows: When solving the problem of contaminated agricultural lands rehabilitation, most of attention is concentrated on the effective means which allow the obtaining of ecologically safe production. The minimization of radionuclides and heavy metals (HM) content in farm products on the basis of their migration characteristics in agro-landscapes and with the regard for different factors influencing contaminants behavior in the soil-plant system is of great significance. Our investigation has shown that the effect of biologically active substances (BAS) using for seeds treatment on {sup 137}Cs transfer to barley grown on Cd contaminated soil was dependent on their properties and dosage, characteristics of soil contamination and biological peculiarities of plants, including stage of plants development. Seeds treatment by plant growth regulator Zircon resulted in a significant increase in {sup 137}Cs activity in harvest (40- 50%), increase in K concentration and significant reduction in Ca concentration. Increased Cd content in soil reduced {sup 137}Cs transfer to barley plants by 30-60% (p<0,05) and Zircon application further reduced its concentration. Ambiol and El also reduced {sup 137}Cs uptake by roots and Cd and Pb phyto-toxicity. The experimental data do not make it possible to link the BAS effect on inhibition of {sup 137}Cs absorption by plants directly with their influence on HM phyto-toxicity. The dependence of Concentration Ratio of {sup 137}Cs on the Ambiol and El dose was not proportional and the most significant decrease in the radionuclide uptake by plants was reported with the use of dose showing the most pronounced stimulating effect on the barley growth and development. The pre-sowing seed treatment with Ambiol increased Pb absorption by 35-50% and, on the contrary, decreased Cd uptake by plants by 30-40%. (authors)

Kruglov, Stanislav; Filipas, Alexander [Russian Institute of Agricultural Radiology and Agroecology, 249020 Obninsk (Russian Federation)

2007-07-01T23:59:59.000Z

188

Centers of near-infrared luminescence in bismuth-doped TlCl and CsI crystals  

E-Print Network (OSTI)

A comparative first-principles study of possible bismuth-related centers in TlCl and CsI crystals is performed and the results of computer modeling are compared with the experimental data. The calculated spectral properties of the bismuth centers suggest that the IR luminescence observed in TlCl:Bi is most likely caused by Bi--Vac(Cl) centers (Bi^+ ion in thallium site and a negatively charged chlorine vacancy in the nearest anion site). On the contrary, Bi^+ substitutional ions and Bi_2^+ dimers are most likely responsible for the IR luminescence observed in CsI:Bi.

Sokolov, V O; Dianov, E M; 10.1364/OE.21.009324

2013-01-01T23:59:59.000Z

189

The Surface Activation Layer of GaAs Negative Electron Affinity Photocathode Activated by Cs, Li and NF3  

Science Conference Proceedings (OSTI)

The lifetime of GaAs photocathodes can be greatly improved by introducing Li in the Cs+NF{sub 3} activation process. The surface activation layer of such photocathodes is studied by synchrotron radiation photoemission and is compared with GaAs photocathodes activated without Li. The charge distributions of N, F and Cs experience significant changes when Li is added in the activation. In addition, the presence of Li causes NF{sub x} molecules to take an orientation with F atoms on top. All these changes induced by Li hold the key for the lifetime improvement of GaAs photocathodes.

Sun, Yun; /SLAC, SSRL; Kirby, R.E.; /Saxet Surface Sci.; Maruyama, T.; /SLAC; Mulhollan, G.A.; Bierman, J.C.; /Saxet Surface Sci.; Pianetta, P.; /SLAC, SSRL

2009-12-11T23:59:59.000Z

190

O Ti-tE LOVE  

Office of Legacy Management (LM)

' ItqQtJulRl' IICt' O Ti-tE LOVE ~t?Al. . . At2D Al.CLkTED IChTTEtt~ . ' . . . : . ' . i I . . . . .mr TttE HOt\' ORAULE~ STANLEY FItZl:; SFCAKER ' . : ,J WE\J i' ORti STATE ASSH' rtrLY l r . . isay 29,.1980 Consultant to the Kew York ' , .' .I, " ..' . ,"' ! -. . . : . . . I.. . . . . ~. ,:- 9.. :. .' , * Ill . ,.. , ,i / All . ' %: : . : . . -. ;:. * :... . _ -. .' . . . I . ' J n' f armed. ?%c firtdingo and backup documentatiin embodied in thi preliminafy report compel the Task Yorao to call trprm ym; thr: . . I SpcnXer, to cwthorim crnd ompowcr the Assemly Sta?ding,CozmiCte I ' . : ,. . ..: .I' .,' :. .~.. ,:. :,-"'. ; ..d ::. . . .~~ ' .,' .' . : ' , ' ..,, -. . -. . . : : ? :. . . . .; *. . 1 ,.' .i. . . : \. .- :. " ' . . . c. : . I ! .'

191

The influence of FeTi and NiTi intermetallide additions on high-temperature oxidation of permalloy alloy  

Science Conference Proceedings (OSTI)

As a rule powder metallurgy Permalloy alloys are used in production of parts for electronic instruments. For the purpose of controlling the magnetic and electrical properties and also the wear (in the case of production of magnetic heads) and corrosion resistance appropriate additions of metals or such compounds as carbides and oxides are added to the alloy. In this work use of FeTi and NiTi intermetallides produced by reaction sintering of powders of pure metals in a protective atmosphere as alloying additions to Permalloy is recommended. The size of the original powders is less than 100 {mu}m. For reaction sintering at temperature 50{degrees}C above the eutectic temperature in the Ti-TiFe and TiNi-Ni systems was selected. The contents of titanium, iron, and oxygen in the FeTi alloy is 51.9, 45.7, and 2.4 wt.%, respectively, and of titanium, nickel, and oxygen in the NiTi alloy 59.6, 31.9, and 4.6 wt.%. High-temperature oxidation in air up to 1300{degrees}C with a rate of change in temperature of 15{degrees}C of type 78N Permalloy with additions of FeTi and NiTi alloys was investigated with use of methods of differential thermal and differential thermogravimetric analyses on an OD-103 derivatograph under nonisothermal conditions. The reaction products were studied by x-ray diffraction phase analysis on a DRON-3 instrument in CoK{sub {alpha}}-radiation. Pure 78N alloy powder with a composition of 78.1% Ni + 19.3% Fe (specimen 1) and also with additions of 1% FeTi (specimen 2) and 1% NiTi (specimen 3) were subjected to oxidation.

Klimenko, V.N.; Lavrenko, V.A.; Panasyuk, O.A.; Blasova, O.V.; Protsenko, T.G. [Inst. of Materials Science, Kiev (Ukraine)

1995-11-01T23:59:59.000Z

192

EVALUATION OF THE MIGRATION POTENTIAL FOR 60Co AND 137Cs AT THE MAINE YANKEE SITE.  

SciTech Connect

The objective of this report is to discuss the degree of sorption and desorption of {sup 137}Cs and {sup 60}Co that may be associated with the granite bedrock and the ''popcorn'' cement drain system that underlie the Maine Yankee Containment Foundation. The purpose is to estimate how much retardation of these two radionuclides takes place in groundwater that flows in the near-field of the Containment Foundation, specifically with respect to contamination originating at the PAB Test Pit. Specific concerns revolve around the potential for the contamination originating near the PAB to create a radioactive dose to a hypothetical ''resident farmer'' using a well intercepting this water to exceed 4 millirems/yr.

FUHRMANN,M.SULLIVAN,T.

2002-08-08T23:59:59.000Z

193

DEVELOPMENT OF DEPOSIT DETECTION SYSTEM IN PIPELINES OF THE STEELWORKS USING CS-137 GAMMA-RAY  

SciTech Connect

The deposit is built up in the pipeline of the steelworks by the chemical reaction among COG (coke oven gas), BFG (blast furnace gas), moisture, and steel in the high temperature environment and obstructs the smooth gas flow. In this study a gamma-ray system is developed to detect the deposit accumulated in pipelines and calculate the accumulation rate with respect to the cross section area of pipes. Cs-137 is used as the gamma-ray source and the system is designed to apply to pipes of various diameters. This system also includes the DB for storage and display of the measurement results so that it can be used for the efficient management of the pipelines.

Song, Won-Joon; Lee, Seung-Hee; Jeong, Hee-Dong [Research Institute of Industrial Science and Technology, 32 Hyoja-Dong, Nam-Ku, Pohang, 790-330 (Korea, Republic of)

2008-02-28T23:59:59.000Z

194

$D$ semileptonic form factors and $|V_{cs(d)}|$ from 2+1 flavor lattice QCD  

Science Conference Proceedings (OSTI)

The measured partial widths of the semileptonic decays D {yields} K{ell}{nu} and D {yields} {pi}{ell}{nu} can be combined with the form factors calculated on the lattice to extract the CKM matrix elements |V{sub cs}| and |V{sub cd}|. The lattice calculations can be checked by comparing the form factor shapes from the lattice and experiment. We have generated a sizable data set by using heavy clover quarks with the Fermilab interpretation for charm and asqtad staggered light quarks on 2+1 flavor MILC ensembles with lattice spacings of approximately 0.12, 0.09, 0.06, and 0.045 fm. Preliminary fits to staggered chiral perturbation theory suggest that we can reduce the uncertainties in the form factors at q{sup 2} = 0 to below 5%.

Bailey, Jon A.; Bazavov, A.; El-Khadra, A.X.; Gottlieb, Steven; Jain, R.D.; Kronfeld, A.S.; Van de Water, R.S.; Zhou, R.

2011-11-01T23:59:59.000Z

195

Robust CsBr/Cu Photocathodes for the Linac Coherent Light Source  

Science Conference Proceedings (OSTI)

The linac coherent light source (LCLS), an x-ray free-electron laser project presently under construction at SLAC, uses a 2.856 GHz rf photocathode gun with a copper cathode for its electron source. While the copper cathode is performing well for the LCLS project, a cathode material with higher quantum efficiency would reduce the drive laser requirements and allow a greater range of operating conditions. Therefore a robust CsBr/Cu photocathode with greater than 50 times the quantum yield at 257 nm relative to the present LCLS copper cathode has been investigated. Preliminary experiments using a dedicated electron source development test stand at SLAC/SSRL are encouraging and are presented in this paper.

Maldonado, Juan R.; /Stanford U., Phys. Dept.; Liu, Zhi; Dowell, D.H.; Kirby, Robert E.; Sun, Yun; Pianetta, Piero; /SLAC; Pease, Fabian; /Stanford U., Phys. Dept.

2011-06-21T23:59:59.000Z

196

Proton Irradiation Response of CsI(Tl) Crystals for the GLAST Calorimeter  

SciTech Connect

The electromagnetic calorimeter of the Gamma-Ray Large Area Space Telescope (GLAST) consists of 16 towers of CsI(Tl) crystals. Each tower contains 8 layers of crystals (each 326.0 x 26.7 x 19.9 mm{sup 3}) arranged in a hodoscopic fashion. The crystals are read out at both ends with photodiodes. Crystals produced by Amcrys-H (Ukraine) are used. A full size crystal was irradiated with a 180 MeV proton beam and the radiation induced attenuation was measured. The induced radioactivity of the crystal was also studied. In this paper we will discuss the damage due to proton irradiation and compare this with the expected in-orbit background flux.

Bergenius, S.; Carius, S.; Carlson, P.; Grove, J.E.; Johansson, G.; Klamra, W.; Nilsson, L.; Pearce, M.; Metzler, S.D.

2012-04-10T23:59:59.000Z

197

Ultra-stable implanted 83Rb/83mKr electron sources for the energy scale monitoring in the KATRIN experiment  

E-Print Network (OSTI)

The KATRIN experiment aims at the direct model-independent determination of the average electron neutrino mass via the measurement of the endpoint region of the tritium beta decay spectrum. The electron spectrometer of the MAC-E filter type is used, requiring very high stability of the electric filtering potential. This work proves the feasibility of implanted 83Rb/83mKr calibration electron sources which will be utilised in the additional monitor spectrometer sharing the high voltage with the main spectrometer of KATRIN. The source employs conversion electrons of 83mKr which is continuously generated by 83Rb. The K-32 conversion line (kinetic energy of 17.8 keV, natural line width of 2.7 eV) is shown to fulfill the KATRIN requirement of the relative energy stability of +/-1.6 ppm/month. The sources will serve as a standard tool for continuous monitoring of KATRIN's energy scale stability with sub-ppm precision. They may also be used in other applications where the precise conversion lines can be separated from the low energy spectrum caused by the electron inelastic scattering in the substrate.

M. Zbo?il; S. Bauer; M. Beck; J. Bonn; O. Dragoun; J. Jak\\rubek; K. Johnston; A. Kovalík; E. W. Otten; K. Schlösser; M. Slezák; A. Špalek; T. Thümmler; D. Vénos; J. Žemli?ka; C. Weinheimer

2012-12-20T23:59:59.000Z

198

ASD(NII)/DoD CIO SUBJECT: Defense Industrial Base (DIB) Cyber Security/Information Assurance (CS/IA) Activities  

E-Print Network (OSTI)

directing the conduct of DIB CS/IA activities to protect unclassified DoD information, as defined in the Glossary, that transits or resides on unclassified DIB information systems and networks. 2. APPLICABILITY. This Instruction applies to OSD, the Military Departments, the Office of

unknown authors

2010-01-01T23:59:59.000Z

199

The new science students in too much, too soon an abbreviated, accelerated, constructivist, collaborative, introductory experience in CS  

Science Conference Proceedings (OSTI)

Although faculty are most accustomed to teaching semester-long traditional courses, they are encountering an increasing number of situations in which they must teach "courses" of only a few hours that are intended to give others a "flavor" of the discipline. ... Keywords: introduction to CS, non-majors, short course, sorting

Samuel A. Rebelsky

2005-02-01T23:59:59.000Z

200

WPI-CS-TR-00-26 December 2000 TxnWrap: A Transactional Approach to Data Warehouse  

E-Print Network (OSTI)

01609-2280 (junchen j chenst j rundenst)@cs.wpi.edu Abstract A Data Warehouse Management System (DWMS warehousing system. Experiments comparing maintenance performance with and without TxnWrap enabled con#12;rm Dynamic Data Warehouse Maintenance (DyDa) system developed at WPI [5]. The basic DyDa system uses SWEEP [1

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201

arXiv:0903.5172v1[cs.IR]30Mar2009 Delocalization transition for the Google matrix  

E-Print Network (OSTI)

arXiv:0903.5172v1[cs.IR]30Mar2009 Delocalization transition for the Google matrix Olivier Giraud,1 (Dated: March 30, 2009) We study the localization properties of eigenvectors of the Google matrix by Google-type search is strongly affected in the phase of delocalized PageRank. PACS numbers: 89.20.Hh, 89

Shepelyansky, Dima

202

Connecting the top-down to the bottom-up: pricing CDO under a conditional survival (CS) model  

Science Conference Proceedings (OSTI)

In this paper, we use exact simulation to price CDO under a new dynamic model, the Conditional Survival (CS) model, which provided excellent calibration to both iTraxx tranches and underlying single name CDS spreads on March 14, 2008, the day before ...

Xian Hua Peng; Steven S. G. Kou

2008-12-01T23:59:59.000Z

203

arXiv:1202.4910v2[cs.DS]8May2012 Distributed Private Heavy Hitters  

E-Print Network (OSTI)

arXiv:1202.4910v2[cs.DS]8May2012 Distributed Private Heavy Hitters Justin Hsu Sanjeev Khanna Aaron the heavy hitters problem while preserving differential privacy in the fully distributed local model. The heavy hitters problem is to find the identity of the most common element shared amongst the n parties

Pennsylvania, University of

204

{sup 40}K, {sup 115}Cs and {sup 226}Ra Soil and Plant Content in Seminatural Grasslands of Central Argentina  

Science Conference Proceedings (OSTI)

Activity concentrations of {sup 40}K, {sup 226}Ra and {sup 137}Cs have been analyzed in soil and plant samples, collected in permanent grassland in central Argentina. Two near areas (A1 and A2) under field conditions with soil undisturbed at least in the last four decades were selected. For each of the three studied radionuclides we do not find differences in the inventories between both areas. The inventories range from 143 kBq m{sup -2} to 197 kBq m{sup -2} for {sup 40}K and from 13 kBq m{sup -2} to 18 kBq m{sup -2} for {sup 226}Ra. The vertical distributions of {sup 40}K and {sup 226}Ra are uniform through de soil profile. For {sup 137}Cs the inventories range from 0.33 kBq m{sup -2} to 0.73 kBq m{sup -2}. In spite of {sup 137}Cs inventories are similar in both areas the distribution through vertical profile is different. {sup 137}Cs activity concentration has a maximum for layers 5-10 cm depth in A1 and 10-15 cm depth in A2. For deeper layers both areas show similar activity concentrations. The diffusion coefficient (D{sub s}) and convection velocity (v{sub s}) are estimated with a convection-diffusion model. D{sub s} values are in the range reported in the bibliography, while v{sub s} values are one order of magnitude higher. After 40 years most {sup 137}Cs fallout is still in the layer 10-15 cm depth. The great penetration of {sup 137}Cs (25 cm) in these soils may be the result of a high sand and low fine materials content. {sup 137}Cs and {sup 226}Ra were not detected in grass samples. Activity concentration of {sup 40}K in vegetal samples ranges from 116 Bq kg{sup -1} to 613 Bq kg{sup -1}. The TF values obtained for {sup 40}K show a lognormal distribution and ranges from 0.05 to 0.42.

Ayub, J. Juri; Velasco, R. H.; Rizzotto, M. [Grupo de Estudios Ambientales. Instituto de Matematica Aplicada San Luis, Universidad Nacional de San Luis-CONICET, Ejercito de los Andes 950 (Argentina); Quintana, E.; Aguiar, J. [Autoridad Regulatoria Nuclear. Avenida del Libertador 8250, Buenos Aires(Argentina)

2008-08-07T23:59:59.000Z

205

Uptakes of Cs and Sr on San Joaquin soil measured following ASTM method C1733.  

SciTech Connect

Series of tests were conducted following ASTM Standard Procedure C1733 to evaluate the repeatability of the test and the effects of several test parameters, including the solution-to-soil mass ratio, test duration, pH, and the concentrations of contaminants in the solution. This standard procedure is recommended for measuring the distribution coefficient (K{sub d}) of a contaminant in a specific soil/groundwater system. One objective of the current tests was to identify experimental conditions that can be used in future interlaboratory studies to determine the reproducibility of the test method. This includes the recommendation of a standard soil, the range of contaminant concentrations and solution matrix, and various test parameters. Quantifying the uncertainty in the distribution coefficient that can be attributed to the test procedure itself allows the differences in measured values to be associated with differences in the natural systems being studied. Tests were conducted to measure the uptake of Cs and Sr dissolved as CsCl and Sr(NO{sub 3}){sub 2} in a dilute NaHCO{sub 3}/SiO{sub 2} solution (representing contaminants in a silicate groundwater) by a NIST standard reference material of San Joaquin soil (SRM 2709a). Tests were run to measure the repeatability of the method and the sensitivity of the test response to the reaction time, the mass of soil used (at a constant soil-to-solution ratio), the solution pH, and the contaminant concentration. All tests were conducted in screw-top Teflon vessels at 30 C in an oven. All solutions were passed through a 0.45-{mu}m pore size cellulose acetate membrane filter and stabilized with nitric acid prior to analysis with inductively-coupled plasma mass spectrometry (ICP-MS). Scoping tests with soil in demineralized water resulted in a solution pH of about 8.0 and the release of small amounts of Sr from the soil. Solutions were made with targeted concentrations of 1 x 10{sup -6} m, 1 x 10{sup -5} m, 2.5 x 10{sup -5} m, 5 x 10{sup -5} m, 1 x 10{sup -4} m, and 5 x 10{sup -4} m to measure the effects of the Cs and Sr concentrations on their uptake by the soil. The pH values of all solutions were adjusted to about pH 8.5 so that the effects of pH and concentration could be measured separately. The 1 x 10{sup -4} m solutions were used to measure the repeatability of the test and the effects of duration, scale, and imposed pH on the test response.

Ebert, W.L.; Petri, E.T. (Chemical Sciences and Engineering Division)

2012-04-04T23:59:59.000Z

206

Spectroscopy identification performance enhancement of a novel CZT/CsI hybrid system  

Science Conference Proceedings (OSTI)

New hybrid spectroscopic systems directly combine spectra from detectors with very different energy resolutions, accommodating standard analyses of the output hybrid spectrum. Simulations of a hybrid system consisting of a 2 or 4 cm{sup 3} cadmium zinc telluride detector combined with a 32.8 cm{sup 3} CsI(Tl) were evaluated for identification performance. 29 nuclides of interest for security applications were simulated as singles and unique pairs, producing 435 spectral simulations at live times of 3, 10, 30, 100 and 300 seconds. The nuclides were modeled as point sources at 25 cm with activities that provide an interesting range of statistical significance for the range of counting times. Standard nuclide identification analyses were applied to the component detectors as well as the hybrid combination. Tallies of the results were used to calculate true and false identification rates. The hybrid system was shown to provide an identification performance benefit, consistently achieving performances closest to ideal relative to the separate component detectors. The hybrid approach enables the consideration of a greater variety of measurement system solutions in terms of cost and performance. (authors)

Russ, W.; Nakazawa, D.; Hau, I.; Morichi, M. [Canberra Industries, Inc., AREVA Company (United States)

2011-07-01T23:59:59.000Z

207

Comportamento eletroquímico do Ti Grau 2 e da liga Ti6A14V em tampões citrato e tampões MCLL Vaine contendo haletos.  

E-Print Network (OSTI)

??Estudou-se o comportamento eletroquímico do Ti grau 2 e da liga Ti6Al4V em tampões citrato e tampões Mcll Vaine, na presença de haletos, em uma… (more)

Anelise Marlene Schmidt

2003-01-01T23:59:59.000Z

208

Nature of Transactions (TI) Code | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Nature of Transactions (TI) Code | National Nuclear Security Administration Nature of Transactions (TI) Code | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Nature of Transactions (TI) Code Home > About Us > Our Programs > Nuclear Security > Nuclear Materials Management & Safeguards System > NMMSS Information, Reports & Forms > Code Tables > Nature of Transactions (TI) Code

209

Explosive joints in Nb--Ti/Cu composite superconductors  

SciTech Connect

Explosive welding techniques have been applied to the joining of a Nb-Ti/ Cu composite conductor. Details of the process are given together with mechanical and electrical evaluations of the resulting joints. (auth)

Cornish, D.N.; Zbasnik, J.P.; Pattee, H.E.

1975-11-01T23:59:59.000Z

210

J-26: Nanocomposite Photocatalysts Containing TiO2 for ...  

Science Conference Proceedings (OSTI)

... viruses, fungi and algae. The main drawbacks of the low quantum yields and the lack of visible-light utilization hinder the practical applications of TiO2. Hence  ...

211

TiO2: Fundamentals, Applications, and Perspectives  

NLE Websites -- All DOE Office Websites (Extended Search)

TiO2: Fundamentals, Applications, and Perspectives Speaker(s): Werner Hofer Date: November 18, 2011 (All day) Location: 90-3122 Seminar HostPoint of Contact: Robert Kostecki I...

212

Composite Ti-6Al-4V + Hydroxyapatite Biomedical Implant Materials ...  

Science Conference Proceedings (OSTI)

Together the augmented diffusion mode and accelerated application of thermal energy allow co-sintering of Ti-6Al-4V + HA below 1000°C to be realized, thus ...

213

080- Carbon Modified (CM)-n-TiO  

Science Conference Proceedings (OSTI)

An undoped reference n-TiO2 sample was also synthesized in an electric oven for .... 131- Metastable ?-FeNi Particles for Self-Limited RF Heating.

214

Effects of Ti Content on Cavitation Resistance of Austenitic Stainless ...  

Science Conference Proceedings (OSTI)

D8: Study of Rack and Chord Assembly Formability for Jack-up Platforms ... Zone of Zr-Ti Microalloyed High-strength High-toughness Offshore Structural Steels.

215

Properties of dc magnetron reactively sputtered TiN  

Science Conference Proceedings (OSTI)

Titanium nitride is of interest for IC fabrication because of its excellent performance as a metallic diffusion barrier. TiN films have been deposited in a batch sputtering system equipped with dc magnetron cathodes

Jim Stimmell

1986-01-01T23:59:59.000Z

216

Synthesis of Nanostructured TiO2 /Carbon Nanotube Heterojunction ...  

Science Conference Proceedings (OSTI)

Microstructural Evolution of SnS Thin Films Grown by Electrodeposition · Morphology Engineering of 1D, 2D and 3D TiO2 Nanostructures and Their Application ...

217

3DXRD Characterization of GNDs and Deformation Twins in ?-Ti  

Science Conference Proceedings (OSTI)

... ?-Ti using the 3DXRD station 34-ID-E at the Advanced Photon Source, Argonne National Laboratory. ... Research at APS 34-ID-E, partly funded by BES/ DOE.

218

Single-electron-capture cross sections by alpha-particles from ground state K(4s) and Rb(5s): A molecular-state approach  

Science Conference Proceedings (OSTI)

Cross sections for single-electron capture by {alpha}-particles from ground state K and Rb were calculated in the low-to-intermediate energy region by employing the molecular expansion method in the framework of impact parameter formulation. The colliding partners are treated as a pseudo-one-electron system and the technique of the pseudopotential is used to account for their mutual interactions. The molecular wave function of the quasimolecule formed during the collision is expanded in terms of basis sets of atomic orbitals on two centers. The resulting coupled equations are solved semiclassically where a straight-line trajectory describes the relative motion of the two nuclei. The effect of electron translation is also suitably incorporated. The calculated cross sections, both total and partial, are presented and compared with the available experimental measurements.

Kumar, A.; Saha, B.C.; Weatherford, C.A. [Florida A and M Univ., Tallahassee, FL (United States). Dept. of Physics

1998-11-01T23:59:59.000Z

219

Ion-pairing in aqueous CaCl2 and RbBr solutions: simultaneous structural refinement of XAFS and XRD data  

SciTech Connect

We present a new methodology involving the simultaneous refinement of both x-ray absorption and x-ray diffraction spectra (X-ray Absorption/Diffraction Structural Refinement,XADSR), to study hydration and ion pair structure of CaCl2 and RbBr salts in concentrated aqueous solutions. The XADSR analysis includes the XAFS spectra analysis of both the cation and anion as a probe of their short-range structure with an XRD spectral analysis as a probe of the global structural. Together they deliver a comprehensive picture of the cation and anion hydration, the contact ion pair (CIP) structure and the solvent-separated ion pair (SSIP) structure. XADSR analysis of 6.0 m aqueous CaCl2 reveals that there are an insignificant number of Ca2+-Cl- CIP’s, but there are approximately 3.4 SSIP’s separated by about 4.99 Å. In contrast XADSR analysis of aqueous RbBr yields about 0.7 pair CIP at a bond length 3.51 Å. The present work demonstrates a new approach for a direct co-refinement of XRD and XAFS spectra in a simple and reliable fashion, opening new opportunities for analysis in various disordered and crystalline systems. This work was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences. Pacific Northwest National Laboratory (PNNL) is operated for the U.S. Department of Energy by Battelle.

Pham, Thai V.; Fulton, John L.

2013-01-28T23:59:59.000Z

220

Superhydrophilic TiO2 surface without photocatalytic activation  

NLE Websites -- All DOE Office Websites (Extended Search)

Superhydrophilic TiO2 surface without photocatalytic activation Superhydrophilic TiO2 surface without photocatalytic activation Title Superhydrophilic TiO2 surface without photocatalytic activation Publication Type Journal Article Year of Publication 2010 Authors Zormpa, Vasileia, Xiaobo Chen, and Samuel S. Mao Journal Applied Physics Letter Volume 96 Issue 9 Date Published 12/2009 Abstract Since the discovery of extreme surface wetting phenomenon induced by ultraviolet photocatalysis, TiO2 has become the material of choice for environmental friendly applications such as self-cleaning coatings. Nevertheless, it remains a significant challenge to realize surfaces exhibiting persistent superhydrophilicity but without the need of external stimuli. We report a bioinspired TiO2 nanostructure that shows extreme superhydrophilicity without the need of light activation, and with stability against successive wetting-dewetting cycles. This ultimate TiO2 wetting surface exhibits high transmittance from near ultraviolet to the infrared, thus enabling practical antifogging technologies where transparency is critical.

Note: This page contains sample records for the topic "ti rb cs" 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

ASSESSMENT OF 90SR AND 137CS PENETRATION INTO REINFORCED CONCRETE (EXTENT OF 'DEEPENING') UNDER NATURAL ATMOSPHERIC CONDITIONS  

SciTech Connect

When assessing the feasibility of remediation following the detonation of a radiological dispersion device or improvised nuclear device in a large city, several issues should be considered including the levels and characteristics of the radioactive contamination, the availability of resources required for decontamination, and the planned future use of the city's structures and buildings. Currently, little is known about radionuclide penetration into construction materials in an urban environment. Knowledge in this area would be useful when considering costs of a thorough decontamination of buildings, artificial structures, and roads in an affected urban environment. Pripyat, a city substantially contaminated by the Chernobyl Nuclear Power Plant accident in April 1986, may provide some answers. The main objective of this study was to assess the depth of {sup 90}Sr and {sup 137}Cs penetration into reinforced concrete structures in a highly contaminated urban environment under natural weather conditions. Thirteen reinforced concrete core samples were obtained from external surfaces of a contaminated building in Pripyat. The concrete cores were drilled to obtain sample layers of 0-5, 5-10, 10-15, 15-20, 20-30, 30-40, and 40-50 mm. Both {sup 90}Sr and {sup 137}Cs were detected in the entire 0-50 mm profile of the reinforced cores sampled. In most of the cores, over 90% of the total {sup 137}Cs inventory and 70% of the total {sup 90}Sr inventory was found in the first 0-5 mm layer of the reinforced concrete. {sup 90}Sr had penetrated markedly deeper into the reinforced concrete structures than {sup 137}Cs.

Farfan, E.; Jannik, T.

2011-10-01T23:59:59.000Z

222

Charge Lifetime Study of K2CsSb Photocathode Inside a JLAB DC High Voltage Gun  

SciTech Connect

Two photocathodes are frequently considered for generating high average current electron beams and/or beams with high brightness for current and future accelerator applications: GaAs:Cs and K2CsSb. Each photocathode has advantages and disadvantages, and need to demonstrate performance at 'production' accelerator facilities. To this end a K2CsSb photocathode was manufactured at Brookhaven National Lab and delivered to Jefferson Lab within a compact vacuum apparatus at pressure {approx} 5 x 10{sup -11} Torr. This photocathode was installed inside a dc high voltage photogun biased at voltages up to 200 kV, and illuminated with laser light at 440 or 532 nm, to generate beams up to 20 mA. Photocathode charge lifetime measurements indicate that under some conditions this cathode has exceptionally high charge lifetime, without measurable QE decay, even from the center of the photocathode where operation using GaAs photocathodes is precluded due to ion bombardment. These studies also suggest a complex QE decay mechanism likely related to chemistry and localized heating via the laser beam.

Mammei, R.; Rao, T.; Suleiman, R.; Poelker, M.; Smedley, J.; McCarter, J.L.

2011-10-01T23:59:59.000Z

223

Native SrTiO3 (001) surface layer from resonant Ti L2,3 reflectance spectroscopy  

SciTech Connect

We quantitatively model resonant Ti L2,3 reflectivity Rs,p(q, hn) from several SrTiO3 (001) single crystals having different initial surface preparations and stored in ambient conditions before and between measurements. All samples exhibit unexpected 300 K Rs(hn) - Rp(hn) anisotropy corresponding to weak linear dichroism and tetragonal distortion of the TiO6 octahedra indicating a surface layer with properties different from cubic SrTiO3. Oscillations in Rs(q) confirm a ubiquitous surface layer 2-3 nm thick that evolves over a range of time scales. Resonant optical constant spectra derived from Rs,p(hn) assuming a uniform sample are refined using a single surface layer to fit measured Rs(q). Differences in surface layer and bulk optical properties indicate that the surface is significantly depleted in Sr and enriched in Ti and O. While consistent with the tendency of SrTiO3 surfaces toward non-stoichiometry, this layer does not conform simply to existing models for the near surface region and apparently forms via room temperature surface reactions with the ambient. This new quantitative spectral modeling approach is generally applicable and has potential to study near-surface properties of a variety of systems with unique chemical and electronic sensitivities.

Valvidares, Manuel; Huijben, Mark; Yu, Pu; Ramesh, Ramamoorthy; Kortright, Jeffrey

2010-11-03T23:59:59.000Z

224

Self-Organized Amorphous TiO2 Nanotube Arrays on Porous Ti Foam for Rechargeable Lithium and Sodium Ion Batteries  

SciTech Connect

Self-organized amorphous TiO2 nanotube arrays (NTAs) were successfully fabricated on both Ti foil and porous Ti foam through electrochemical anodization techniques. The starting Ti foams were fabricated using ARCAM s Electron Beam Melting (EBM) technology. The TiO2 NTAs on Ti foam were used as anodes in lithium ion batteries; they exhibited high capacities of 103 Ahcm-2 at 10 Acm-2 and 83 Ahcm-2 at 500 Acm-2, which are two to three times higher than those achieved on the standard Ti foil, which is around 40 Ahcm-2 at 10 Acm-2 and 24 Ahcm-2 at 500 Acm-2, respectively. This improvement is mainly attributed to higher surface area of the Ti foam and higher porosity of the nanotube arrays layer grown on the Ti foam. In addition, a Na-ion half-cell composed of these NTAs anodes and Na metal showed a self-improving specific capacity upon cycling at 10 Acm-2. These results indicate that TiO2 NTAs grown on Ti porous foam are promising electrodes for Li-ion or Na-ion rechargeable batteries.

Bi, Zhonghe [ORNL; Paranthaman, Mariappan Parans [ORNL; Menchhofer, Paul A [ORNL; Dehoff, Ryan R [ORNL; Bridges, Craig A [ORNL; Chi, Miaofang [ORNL; Guo, Bingkun [ORNL; Sun, Xiao-Guang [ORNL; Dai, Sheng [ORNL

2013-01-01T23:59:59.000Z

225

Distribution and Ratios of 137Cs and K in Control and K-treated Coconut Trees at Bikini Island where Nuclear Test Fallout Occurred: Effects and Implications  

SciTech Connect

Coconut trees growing on atolls of the Bikini Islands are on the margin of K deficiency because the concentration of exchangeable K in coral soil is very low ranging from only 20 to 80 mg kg{sup -1}. When provided with additional K, coconut trees absorb large quantities of K and this uptake of K significantly alters the patterns of distribution of {sup 137}Cs within the plant. Following a single K fertilization event, mean total K in trunks of K-treated trees is 5.6 times greater than in trunks of control trees. In contrast, {sup 137}Cs concentration in trunks of K-treated and control trees is statistically the same while {sup 137}Cs is significantly lower in edible fruits of K treated trees. Within one year after fertilization (one rainy season), K concentration in soil is back to naturally, low concentrations, however, the tissue concentrations of K in treated trees stays very high internally in the trees for years while {sup 137}Cs concentration in treated trees remains very low in all tree compartments except for the trunk. Potassium fertilization did not change soil Cs availability. Mass balance calculations suggest that the fertilization event increased above ground plant K content by at least a factor of 5 or 2.2 kg. Potassium concentrations and content were higher in all organs of K fertilized trees with the greatest increases seen in organs that receive a portion of tissue K through xylem transport (trunk, fronds and fruit husks) and lowest in organs supplied predominantly with K via the phloem (palm heart, spathe, coco meat and fluid). {sup 137}Cesium concentrations and contents were dramatically lower in all organs of K treated trees with greatest proportional reductions observed in organs supplied predominantly with K via the phloem (palm heart, spathe, coco meat and fluid). All trees remobilize both K and {sup 137}Cs from fronds as they proceed toward senescence. In control trees the reduction in concentration of K and {sup 137}Cs in fronds as they age is logarithmic but K remobilization is linear in K-treated trees where K concentration is high. As a result of K treatment the {sup 137}Cs concentration in K-treated fronds is extremely low and constant with frond age. Fronds of K treated trees contain a greater amount of K than control tree fronds. As they fall to the ground and decay they provide a small continuing pool of K that is about 3% of the natural K in soil under the tree canopy. Results of K and {sup 137}Cs concentration and distribution in control and K-treated coconut trees suggest that the application of K reduces {sup 137}Cs uptake both in the short term immediately following K fertilization and in the long term, after soil K levels have returned to normal but while plant K stores remain high. These results suggests that high internal K concentration and not high soil K is primarily responsible for long-term reduction of {sup 137}Cs in edible fruits, and plays a significant role in limiting further uptake of {sup 137}Cs by roots, and affects allocation of {sup 137}Cs to edible fruits for years. Coconut trees are capable of luxury K accumulation when provided with excess K and in this example the additional K can effectively provide the K requirements of the plant for in excess of 10 years. The reduction of {sup 137}Cs uptake lasts for at least 10 y after K is last applied and greatly reduces the estimated radiation dose to people consuming local tree foods. Effectiveness and duration of K treatment provides important assurances that reduction in {sup 137}Cs is long term and the radiation dose from consuming local plant foods will remain low.

Robison, W L; Brown, P H; Stone, E L; Hamilton, T F; Conrado, C L; Kehl, S R

2008-05-19T23:59:59.000Z

226

BaTiO? based materials for piezoelectric and electro-optic applications  

E-Print Network (OSTI)

Ferroelectric materials are key to many modem technologies, in particular piezoelectric actuators and electro-optic modulators. BaTiO? is one of the most extensively studied ferroelectric materials. The use of BaTiO? for ...

Avrahami, Ytshak, 1969-

2003-01-01T23:59:59.000Z

227

Ti3+ in the surface of titanium dioxide: generation, properties and photocatalytic application  

Science Conference Proceedings (OSTI)

Titanium dioxide (TiO2) is the most investigated crystalline oxide in the surface science of metal oxides. Its physical and chemical properties are dominantly determined by its surface condition. Ti3+ surface defect (TSD) is one ...

Liang-Bin Xiong; Jia-Lin Li; Bo Yang; Ying Yu

2012-01-01T23:59:59.000Z

228

Friction Stir Processing of Ti-6Al-4V for Grain Size Reduction in ...  

Science Conference Proceedings (OSTI)

In Ti alloys, such as Ti-6Al-4V, fusion welding results in coarse-grained microstructure ... Friction Stir Spot Welding of Magnesium to Aluminum Alloys with a Cold ...

229

Molecular beam epitaxy of SrTiO3 with a growth window  

E-Print Network (OSTI)

Estimated MBE growth window for SrTiO 3 in conventional MBEregion shows the growth window for stoichiometric films with4 (color online): Growth window for stoichiometric SrTiO 3

Stemmer, Susanne

2009-01-01T23:59:59.000Z

230

Compton Profile Study of Intermetallic Ti{sub 3}Al  

SciTech Connect

The Compton scattering measurement on intermetallic alloy Ti{sub 3}Al is reported in this work. The measurement is made using 59.54 keV gamma-rays from Am{sup 241} source. Theoretical calculation of Compton profile is also performed employing CRYSTAL code within the framework of density functional theory to compare with the measurement. The theoretical profile of the alloy is also synthesized following the superposition model taking the published Compton profiles of elemental solids from the APW method. The experimental study of charge transfer in the alloys has also been done by performing the experimental Compton profile measurements on Ti and Al following the superposition model and charge transfer from Al to Ti is clearly seen on the alloy formation.

Vyas, V.; Sharma, G. [Department of Physics, Banasthali University, Banasthali-304022 (India); Mishra, M. C.; Sharma, B. K. [Department of Physics, University of Rajasthan, Jaipur-302004 (India); Joshi, K. B. [Department of Physics, University College of Science, M.L.Sukhadia University, Udaipur-313 002 (India)

2011-10-20T23:59:59.000Z

231

Topology of charge density and elastic properties of Ti3SiC2 polymorphs  

E-Print Network (OSTI)

1. Structure models of Ti 3 SiC 2 . ? and ? refer to the twothe Brillouin zone of Ti 3 SiC 2 . c 400 MPa a 400 MPa c 400and elastic properties of Ti 3 SiC 2 polymorphs R. Yu, X. F.

Yu, Rong; Zhang, Xiao Feng; He, Lian Long; Ye, Heng Qiang

2004-01-01T23:59:59.000Z

232

High strength, light weight Ti-Y composites and method of making same  

DOE Patents (OSTI)

A high strength, light weight in-situ'' Ti-Y composite is produced by deformation processing a cast body having Ti and Y phase components distributed therein. The composite comprises elongated, ribbon-shaped Ti and Y phase components aligned along an axis of the deformed body.

Verhoeven, J.D.; Ellis, T.W.; Russell, A.M.; Jones, L.L.

1993-04-06T23:59:59.000Z

233

Fabrication and thermoelectric properties of fine-grained TiNiSn compounds  

Science Conference Proceedings (OSTI)

Nearly single-phased TiNiSn half-Heusler compound thermoelectric materials were synthesized by combining mechanical alloying (MA) and spark plasma sintering (SPS) in order to reduce its thermal conductivity by refining the grain sizes. Although TiNiSn compound powders were not synthesized directly via MA, dense bulk samples of TiNiSn compound were obtained by the subsequent SPS treatment. It was found that an excessive Ti addition relative to the TiNiSn stoichiometry is effective in increasing the phase purity of TiNiSn half-Heusler phase in the bulk samples, by compensating for the Ti loss caused by the oxidation of Ti powders and MA processing. The maximum power factor value obtained in the Ti-compensated sample is 1720 muW m{sup -1} K{sup -2} at 685 K. A relatively high ZT value of 0.32 is achieved at 785 K for the present undoped TiNiSn compound polycrystals. - Graphical abstract: Nearly single-phased TiNiSn-based half-Heusler compound polycrystalline materials with fine grains were fabricated by combining mechanical alloying (MA) and spark plasma sintering (SPS). A high ZT value for undoped TiNiSn was obtained because of the reduced thermal conductivity.

Zou Minmin [State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Li Jingfeng, E-mail: jingfeng@mail.tsinghua.edu.c [State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Du Bing; Liu Dawei [State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China); Kita, Takuji [Advanced Material Engineering Division, Vehicle Engineering Group, Higashifuji Technical Center, Toyota Motor Corporation, 1200, Mishuku, Susono, Shizuoka 410-1193 (Japan)

2009-11-15T23:59:59.000Z

234

Impact of TiN post-treatment on metal insulator metal capacitor performances  

Science Conference Proceedings (OSTI)

When deposited by chemical vapor deposition (CVD), TiN layers must be post-treated with N"2/H"2 plasma. Metal-insulator-metal (MIM) capacitors using CVD-TiN as electrodes and Al"2O"3 as insulator are studied from both electrical and physico-chemical ... Keywords: EELS analysis, Electrical characteristics, MIM capacitors, TiN post-treatment

A. Bajolet; J-P. Manceau; S. Bruyère; R. Clerc; M. Proust; N. Gaillard; J-C. Giraudin; P. Delpech; L. Montès; G. Ghibaudo

2006-11-01T23:59:59.000Z

235

High strength, light weight Ti-Y composites and method of making same  

DOE Patents (OSTI)

A high strength, light weight "in-situ" Ti-Y composite is produced by deformation processing a cast body having Ti and Y phase components distributed therein. The composite comprises elongated, ribbon-shaped Ti and Y phase components aligned along an axis of the deformed body.

Verhoeven, John D. (Ames, IA); Ellis, Timothy W. (Ames, IA); Russell, Alan M. (Ames, IA); Jones, Lawrence L. (Ames, IA)

1993-04-06T23:59:59.000Z

236

Hydrogen induced C-C, C-N, and C-S bond activation on Pt and Ni surfaces  

SciTech Connect

The work has focussed on hydrogen induced bond activation in adsorbed organic molecules and intermediates containin C-S and C-N and C-C bonds on Ni(100), Ni(111), and Pt(111) surfaces. Fluorescence Yield Near Edge Spectroscopy (FYNES) above the carbon K edge was used for adsorbed organic reactants and in-situ kinetic studies of bond activation. Results indicate that the activation is enhanced on Ni relative to Pt. Methylthiolate and methylamine adsorbed on Pt(111) were studied.

Gland, J.L.

1992-01-01T23:59:59.000Z

237

Hydrogen induced C-C, C-N, and C-S bond activation on Pt and Ni surfaces  

SciTech Connect

The work has focussed on hydrogen induced bond activation in adsorbed organic molecules and intermediates containin C-S and C-N and C-C bonds on Ni(100), Ni(111), and Pt(111) surfaces. Fluorescence Yield Near Edge Spectroscopy (FYNES) above the carbon K edge was used for adsorbed organic reactants and in-situ kinetic studies of bond activation. Results indicate that the activation is enhanced on Ni relative to Pt. Methylthiolate and methylamine adsorbed on Pt(111) were studied.

Gland, J.L.

1992-12-01T23:59:59.000Z

238

Rb--Sr, K--Ar, and fission-track geochronological studies of samples from LASL drill holes GT-1, GT-2, and EE-1  

DOE Green Energy (OSTI)

Geochronological investigations using the Rb-Sr, K-Ar, and fission-track methods have been completed on core samples from the three LASL deep drill holes, GT-1, GT-2, and EE-1. This work indicates a complex history for these Precambrian rocks beginning with a metamorphic event at 1.66 b.y. which generated the gneisses and schists from older sedimentary and igneous rocks. The metamorphic complex was intruded by at least two different magmas at 1.3--1.4 b.y. producing thin felsic dikes and a major biotite granodiorite pluton. This igneous activity caused pervasive argon loss to occur, lowering the K-Ar ages to about 1.4 b.y. Plio-Pleistocene igneous activity related to formation of the Valles Caldera increased the local geothermal gradient to 50--60/sup 0/C/km and produced fission track annealing in apatite and again argon loss from the biotite in deeper samples.

Brookins, D.G.; Forbes, R.B.; Turner, D.L.; Laughlin, A.W.; Naeser, C.W.

1977-06-01T23:59:59.000Z

239

CHANGES IN 137 CS CONCENTRATIONS IN SOIL AND VEGETATION ON THE FLOODPLAIN OF THE SAVANNAH RIVER OVER A 30 YEAR PERIOD  

SciTech Connect

{sup 137}Cs released during 1954-1974 from nuclear production reactors on the Savannah River Site, a US Department of Energy nuclear materials production site in South Carolina, contaminated a portion of the Savannah River floodplain known as Creek Plantation. {sup 137}Cs activity concentrations have been measured in Creek Plantation since 1974 making it possible to calculate effective half-lives for {sup 137}Cs in soil and vegetation and assess the spatial distribution of contaminants on the floodplain. Activity concentrations in soil and vegetation were higher near the center of the floodplain than near the edges as a result of frequent inundation coupled with the presence of low areas that trapped contaminated sediments. {sup 137}Cs activity was highest near the soil surface, but depth related differences diminished with time as a likely result of downward diffusion or leaching. Activity concentrations in vegetation were significantly related to concentrations in soil. The plant to soil concentration ratio (dry weight) averaged 0.49 and exhibited a slight but significant tendency to decrease with time. The effective half-lives for {sup 137}Cs in shallow (0-7.6 cm) soil and in vegetation were 14.9 (95% CI = 12.5-17.3) years and 11.6 (95% CI = 9.1-14.1) years, respectively, and rates of {sup 137}Cs removal from shallow soil and vegetation did not differ significantly among sampling locations. Potential health risks on the Creek Plantation floodplain have declined more rapidly than expected on the basis of radioactive decay alone because of the relatively short effective half-life of {sup 137}Cs.

Paller, M.; Jannik, T.; Fledderman, P.

2007-12-12T23:59:59.000Z

240

Nuclear forces from quenched and 2+1 flavor lattice QCD using the PACS-CS gauge configurations  

E-Print Network (OSTI)

Two of recent progress in lattice QCD approach to nuclear force are reported. (i) Tensor force from quenched lattice QCD: By truncating the derivative expansion of inter-nucleon potential to the strictly local terms, we obtain central force V_C(r) and tensor force V_T(r) separately from s-wave and d-wave components of Bethe-Salpeter wave function for two nucleon state with J^P=1^+. Numerical calculation is performed with quenched QCD on 32^4 lattice using the standard plaquette action at beta=5.7 with the standard Wilson quark action with kappa=0.1640, 0.1665, 0.1678. Preliminary results show that the depths of the resulting tensor force amount to 20 to 40 MeV, which is enhanced in the light quark mass region. (ii) Nuclear force from 2+1 flavor QCD with PACS-CS gauge configuration: Preliminary full QCD results are obtained by using 2+1 flavor gauge configurations generated by PACS-CS collaboration. The resulting potential has the midium range attraction of about 30 MeV similar to the preceding quenched calculations. However, the repulsive core at short distance is significantly stronger than the corresponding quenched QCD result.

N. Ishii; S. Aoki; T. Hatsuda; for PACS-CS Collaboration

2009-03-31T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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

Mid-year status report for TTP {number_sign}SR-1320-02 UST: Cs extraction testing  

Science Conference Proceedings (OSTI)

This project was designed to perform several tasks to provide transfer of technology to PNL concerning optimization of a cesium-specific ion exchange resin, developed at WSRC. The tasks support the development of a Compact Processing Unit (CPU) for Cs-removal from a variety of waste streams at Westinghouse Hanford (WH). In a series of experiments, WSRC has studied the behavior of a small column of the resin at various, increasingly greater flow rates with the HW simulant solution to determine an optimum column loading rate. Elution studies of the resin after saturation with Cs+ will generate an elution profile from which an optimum elution medium, flow rate, and volume can be determined. Small column tests at temperatures ranging from 40{degrees}C 80{degrees}C are planned but have not yet begun. Further, WSRC has begun a study in which the resin is subjected to ionizing radiation in a Co-60 source. This study will determine if any flammable or hazardous compounds, that might require special process controls, are formed as a result of irradiation. it will also define the ability of the resin to maintain its selectivity and capacity in a radiation field. During this period, a literature survey of the effects of radiation on this type of resin and similar compounds was initiated. For this survey, the extensive database established by the Radiation Chemistry Data Center at the University of Notre Dame is being used.

Bibler, J.P.

1993-04-29T23:59:59.000Z

242

Experimental and theoretical investigations of Cs-Ba vapor tacitron inverter for power conditioning in space power systems. Annual report, April 15, 1992--April 14, 1993  

SciTech Connect

The operation characteristics of the Cs-Ba tacitron as a switch are investigated experimentally in three modes: (a) breakdown mode, (b) I-V mode, and (c) current modulation mode. The switching frequency, grid potentials for ignition and extinguishing of discharge, and the Cs pressure and emission conditions (Ba pressure and emitter temperature) for stable current modulation are determined. The experimental data is also used to determine the off-time required for successful ignition, and the effects of the aforementioned operation parameters on the ignition duty cycle threshold for stable modulation. Operation parameters measured include switching frequency up to 20 kHz, hold-off voltage up to 180 V, current densities in excess of 15 A/cm{sup 2}, switch power density of 1 kW/cm{sup 2}. and a switching efficiency in excess of 90% at collector C: realer than 30 V. The voltage drop strongly depends on the Cs pressure and to a lesser extent on the emission conditions. Increasing the Cs pressure and/or the emission current lowers the voltage drop, however, for the same initial Cs pressure and emission conditions, the voltage drop in the I-V mode is usually lower than that during current modulation. As long as the discharge current is kept lower that the.emission current, the voltage drop during stable current modulation could be as low as 3 V.

El-Genk, M.; Murray, C.; Wernsman, B.

1993-01-01T23:59:59.000Z

243

A theoretical investigation on photocatalytic oxidation on the TiO{sub 2} surface  

SciTech Connect

The TiO{sub 2} photocatalytic oxidation mechanism was theoretically investigated by using long-range corrected time-dependent density functional theory (LC-TDDFT) with a cluster model of the anatase TiO{sub 2}(001) surface. We found that LC-TDDFT with the cluster model quantitatively reproduces the photoexcitations of the TiO{sub 2} surface by calculating the electronic spectra of a clean TiO{sub 2} surface and one with oxygen defects. We calculated the electronic spectra of a molecularly adsorbed TiO{sub 2} surface for the adsorptions of phenol, methanol, and methane molecules as typical organic molecules. We obtained the surprising result that the main peak of the phenol-adsorbed TiO{sub 2} surface, which overlaps with the main peak of the clean TiO{sub 2} surface, corresponds to charge transfers from the phenol molecule to the TiO{sub 2} surface. This indicates that the TiO{sub 2} photocatalytic oxidation proceeds through direct charge transfer excitation from the substrate molecules to the TiO{sub 2} surface. In contrast, we found slight and no charge transfer for methanol and methane adsorption, respectively, in agreement with the experimental findings for their reactivities. In light of these results, we propose a new mechanism for heterogeneous TiO{sub 2} photocatalytic oxidations.

Suzuki, Satoshi [Department of Applied Chemistry, School of Engineering, University of Tokyo, Tokyo 113-8656 (Japan); Tsuneda, Takao; Hirao, Kimihiko [Advanced Science Institute, RIKEN, Wako, Saitama 351-0198 (Japan); CREST, Japan Science and Technology Agency (JST), Tokyo 113-8656 (Japan)

2012-01-14T23:59:59.000Z

244

Single Variable and Multivariate Analysis of Remote Laser-Induced Breakdown Spectra for Prediction of Rb, Sr, Cr, Ba, and V in Igneous Rocks  

SciTech Connect

Laser-induced breakdown spectroscopy (LIBS) will be employed by the ChemCam instrument on the Mars Science Laboratory rover Curiosity to obtain UV, VIS, and VNIR atomic emission spectra of surface rocks and soils. LIBS quantitative analysis is complicated by chemical matrix effects related to abundances of neutral and ionized species in the resultant plasma, collisional interactions within plasma, laser-to-sample coupling efficiency, and self-absorption. Atmospheric composition and pressure also influence the intensity of LIBS plasma. These chemical matrix effects influence the ratio of intensity or area of a given emission line to the abundance of the element producing that line. To compensate for these complications, multivariate techniques, specifically partial least-squares regression (PLS), have been utilized to predict major element compositions (>1 wt.% oxide) of rocks, PLS methods regress one or multiple response variables (elemental concentrations) against multiple explanatory variables (intensity at each pixel of the spectrometers). Because PLS utilizes all available explanatory variable and eliminates multicollinearity, it generally performs better than univariate methods for prediction of major elements. However, peaks arising from emissions from trace elements may be masked by peaks of higher intensities from major elements. Thus in PLS regression, wherein a correlation coefficient is determined for each elemental concentration at each spectrometer pixel, trace elements may show high correlation with more intense lines resulting from optical emissions of other elements. This could result in error in predictions of trace element concentrations. Here, results of simple linear regression (SLR) and multivariate PLS-2 regression for determination of trace Rb, Sr, Cr, Ba, and V in igneous rock samples are compared. This study focuses on comparisons using only line intensities rather than peak areas to highlight differences between SLR and PLS.

Clegg, Samuel M [Los Alamos National Laboratory; Wiens, Roger C. [Los Alamos National Laboratory; Speicher, Elly A [MT HOLYOKE COLLEGE; Dyar, Melinda D [MT HOLYOKE COLLEGE; Carmosino, Marco L [MT HOLYOKE COLLEGE

2010-12-23T23:59:59.000Z

245

Direct-Reaction Studies by Particle-Gamma Coincidence Spectroscopy Using HPGe-CsI and HPGe-Si Arrays  

Science Conference Proceedings (OSTI)

Particle- and particle- - coincidence spectroscopy has several advantages in the study of direct reactions(particularly in inverse kinematics) since it can generally allow determination of: decay paths; high-precision level energies; multipolarities of transitions; and cross sections. Techniques for studying direct reactions by particle- coincidence spectroscopy are presented for two cases: (1) heavy-ion reactions with HPGe-CsI, and (2) light-ion reactions with HPGe-Si. Future direct-reaction studies with radioactive ion beams (RIBs) will mostly involve low beam intensities and inverse kinematics (i.e., Abeam>Atarget), which eliminates the traditional use of magnetic spectrometers. Particle- coincidence spectroscopy currently provides the most viable method to study direct reactions with nuclei of any level density. In the present study, the capabilities and limitations of the technique are explored.

Allmond, James M [ORNL

2013-01-01T23:59:59.000Z

246

Growth and Properties of (001)-oriented Pb(Zr?.??Ti?.??)O?/LaNiO? Films on Si(001) Substrates with TiN Buffer Layers  

E-Print Network (OSTI)

Pulsed laser deposition has been used to grow Pb(Zr?.??Ti?.??)O? (PZT)/LaNiO? (LNO) heterostructures with restricted crystallographic orientations on bare Si(001) and SiO?-coated Si(001) substrates, using TiN buffer layers. ...

Zhu, Tie-Jun

247

Current Status of Ti PM: Progress, Opportunities and Challenges  

SciTech Connect

Utilization of titanium components made by powder metallurgy methods has had limited acceptance largely due to the high cost of titanium (Ti) powder. There has been renewed interest in lower cost powder and several Ti reduction methods that produce a particulate product show promise. This talk summarizes work done at Oak Ridge National Laboratory to consolidate these lower cost powders into mill products. Press and sinter consolidation, hot isostatic pressing (HIP) and direct roll consolidation to make sheet have been explored. The characteristics of the consolidated products will be described as a function of the consolidation parameters. Research sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Industrial Technologies Program, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.

Peter, William H [ORNL; Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Dehoff, Ryan R [ORNL; Muth, Thomas R [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [ORNL; Clark, Michael B [ORNL; Sabau, Adrian S [ORNL; Gorti, Sarma B [ORNL; Blue, Craig A [ORNL; Williams, James C [Ohio State University

2012-01-01T23:59:59.000Z

248

Tribological behavior of NiTi alloy against 52100 steel and WC at elevated temperatures  

SciTech Connect

The dry tribological behavior of a Ti-50.3 at.% Ni alloy at temperatures of 25 deg. C, 50 deg. C and 200 deg. C was studied. The wear tests were performed on a high temperature pin-on-disk tribometer using 52100 steel and tungsten carbide pins. The worn surfaces of the NiTi alloy were examined by scanning electron microscope. The results showed that in the wear tests involving steel pins, the wear rate of the NiTi decreased as the wear testing temperature was increased. However, for the NiTi/WC contact, a reverse trend was observed. There was also a large decrease in the coefficient of friction for the NiTi/steel contact with increasing wear testing temperature. The formation of compact tribological layers could be the main reason for the reduction of the wear rate and coefficient of friction of the NiTi/steel contact at higher wear testing temperatures.

Abedini, M. [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of); Ghasemi, H.M., E-mail: hghasemi@ut.ac.ir [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of); Ahmadabadi, M. Nili [School of Metallurgy and Materials Engineering, University of Tehran, Tehran (Iran, Islamic Republic of)

2010-07-15T23:59:59.000Z

249

Kinetics and thermochemistry of reversible adduct formation in the reaction of Cl( sup 2 P sub J ) with CS sub 2  

Science Conference Proceedings (OSTI)

Reversible adduct formation in the reaction of Cl({sup 2}P{sub J}) with CS{sub 2} has been observed over the temperature range 193-258 K by use of time-resolved resonance fluorescence spectroscopy to follow the decay of pulsed-laser-generated Cl({sup 2}P{sub J}) into equilibrium with CS{sub 2}Cl. Rate coefficients for CS{sub 2}Cl formation and decomposition have been determined as a function of temperature and pressure; hence, the equilibrium constant has been determined as a function of temperature. We find that the rate coefficient for CS{sub 2}Cl + O{sub 2} reaction via all channels that do not generate Cl({sup 2}P{sub J}) is <2.5 {times} 10{sup {minus}16} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} at 293 K and 300-Torr total pressure and that the total rate coefficient is <2 {times} 10{sup {minus}15} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} at 230 K and 30-Torr total pressure.

Nicovich, J.M.; Shackelford, C.J.; Wine, P.H. (Georgia Institute of Technology, Atlanta (USA))

1990-04-05T23:59:59.000Z

250

Available at URL ftp://ftp.cs.dartmouth.edu/TR/TR97-306.ps.Z AGDB: A Debugger for Agent Tcl  

E-Print Network (OSTI)

Available at URL ftp://ftp.cs.dartmouth.edu/TR/TR97-306.ps.Z AGDB: A Debugger for Agent Tcl Melissa, dfkg@dartmouth.edu Technical Report PCS-TR97-306 February 4, 1997 Abstract The Agent Tcl language is an extension of Tcl/Tk that supports distributed programming in the form of transportable agents. AGDB

251

Available at URL ftp://ftp.cs.dartmouth.edu/TR/TR97306.ps.Z AGDB: A Debugger for Agent Tcl  

E-Print Network (OSTI)

Available at URL ftp://ftp.cs.dartmouth.edu/TR/TR97­306.ps.Z AGDB: A Debugger for Agent Tcl Melissa, dfkg@dartmouth.edu Technical Report PCS­TR97­306 February 4, 1997 Abstract The Agent Tcl language is an extension of Tcl/Tk that supports distributed programming in the form of transportable agents. AGDB

252

Battery Emulation 2 0740-7475/05/$20.00 2005 IEEE Copublished by the IEEE CS and the IEEE CASS IEEE Design & Test of Computers  

E-Print Network (OSTI)

Battery Emulation 2 0740-7475/05/$20.00 © 2005 IEEE Copublished by the IEEE CS and the IEEE CASS in portable devices such as PDAs and celluar phones, batteries are quickly becoming a lim- iting factor. Recently, researchers have started develop- ing battery-aware power management techniques that exploit

Shinozuka, Masanobu

253

METHOD FOR SIMULTANEOUS 90SR AND 137CS IN-VIVO MEASUREMENTS OF SMALL ANIMALS AND OTHER ENVIRONMENTAL MEDIA DEVELOPED FOR THE CONDITIONS OF THE CHERNOBYL EXCLUSION ZONE  

SciTech Connect

To perform in vivo simultaneous measurements of the {sup 90}Sr and {sup 137}Cs content in the bodies of animals living in the Chernobyl Exclusion Zone (ChEZ), an appropriate method and equipment were developed and installed in a mobile gamma beta spectrometry laboratory. This technique was designed for animals of relatively small sizes (up to 50 g). The {sup 90}Sr content is measured by a beta spectrometer with a 0.1 mm thick scintillation plastic detector. The spectrum processing takes into account the fact that the measured object is 'thick-layered' and contains a comparable quantity of {sup 137}Cs, which is a characteristic condition of the ChEZ. The {sup 137}Cs content is measured by a NaI scintillation detector that is part of the combined gamma beta spectrometry system. For environmental research performed in the ChEZ, the advantages of this method and equipment (rapid measurements, capability to measure live animals directly in their habitat, and the capability of simultaneous {sup 90}Sr and {sup 137}Cs measurements) far outweigh the existing limitations (considerations must be made for background radiation and the animal size, skeletal shape and body mass). The accuracy of these in vivo measurements is shown to be consistent with standard spectrometric and radiochemical methods. Apart from the in vivo measurements, the proposed methodology, after a very simple upgrade that is also described in the article, works even more accurately with samples of other media, such as soil and plants.

Farfan, E.; Jannik, T.

2011-10-01T23:59:59.000Z

254

HoustonChronicle.com Page 1 of 2 http://www.chron.com/cs/CDA/printstory.hts/prn/texas/880944 4/23/2001  

E-Print Network (OSTI)

HoustonChronicle.com Page 1 of 2 http://www.chron.com/cs/CDA/printstory.hts/prn/texas/880944 4 in Richardson, Texas (c) 2001 Business Wire. News/Assignment Editors & High-Tech Writers REMINDER...for Tuesday WHEN: Tuesday, April 17, 1:45 p.m. CST WHERE: Radisson Hotel Dallas North at Richardson, Texas 1981

Chiao, Jung-Chih

255

Comparison of the spectral response of a thinned, backside illuminated CCD with a CsI coated MCP system and Kodak 101 film  

Science Conference Proceedings (OSTI)

A thinned backside illuminated CCD chip was calibrated by self consistently determining the thickness of its dead layer. Its spectral response and sensitivity were then compared with those of the calibrated Kodak 101 photographic plates and of a CsI coated microchannel plate detection system.

Li Yuelin; Crespo Lopex-Urrutia, J. R.; Tsakiris, G. D.; Sigel, R.; Volk, R.; Pina, L. [Max-Planck Institut fuer Quantenoptik, 85748, Garching (Germany); Czech Technical University, 18040 Prague (Czech Republic)

1995-05-01T23:59:59.000Z

256

DEPARTMENT OF COMPUTER SCIENCE April 16, 2013 NOTE: Change in BS CS Requirements beginning Fall 2013 the 1 unit BIOL 101 lab is no longer  

E-Print Network (OSTI)

2013 ­ the 1 unit BIOL 101 lab is no longer required, but has been replaced with the 1-unit mandatory and an efficient path to graduation. We recognized that the required 1-unit BIOL 101 Lab had become impacted to improve their system and tools skills. To correct this, we dropped the 1-unit BIOL 101 Lab from our CS BS

257

Portland State University Standard Terms and Conditions for the Purchase of Goods and Services, Effective July 1, 2004 Ts & Cs Goods and Services-1.DOC  

E-Print Network (OSTI)

Portland State University Standard Terms and Conditions for the Purchase of Goods and Services, Effective July 1, 2004 Ts & Cs Goods and Services-1.DOC PORTLAND STATE UNIVERSITY STANDARD TERMS, including but not limited to the Invitation to Bid or Request for Proposal and its specifications, terms

Lafferriere, Gerardo

258

arXiv:1003.2138v1[cs.IT]10Mar2010 1 Need-based Communication for Smart Grid: When  

E-Print Network (OSTI)

arXiv:1003.2138v1[cs.IT]10Mar2010 1 Need-based Communication for Smart Grid: When to Inquire Power Price? Husheng Li and Robert C. Qiu Abstract-- In smart grid, a home appliance can adjust its power on smart grid do not consider the cost of communications which cannot be ignored in many situations

Qiu, Robert Caiming

259

Synthesis, characterization, and ion exchange properties of a sodium nonatitanate, Na4Ti9O20.xH2O  

E-Print Network (OSTI)

During the Cold War, the Hanford Weapons Site in Richland, Washington, produced weapons grade plutonium which first needed to be separated from the other products using the PUREX process (plutonium and uranium extraction). As a by product of this process, millions of cubic meters of highly acidic radioactive waste were produced which are now stored in million gallon tanks at the Hanford site. Over the years, some tanks have been known to leak and some are even in danger of exploding. Because of these problems, the waste needs to be removed from these tanks and given permanent, safe storage. The purpose of this research is to produce a more efficient ion exchanger to separate the highly radioactive isotopes (9oSr, 137 Cs and transuranics) from the large quantities of inert salts. The smaller volume of high level waste produced can then be vitrified in glass and stored, while the low level waste can be poured into less expensive cement and glass. In this work, different parameters of the synthesis of the sodium nonatitanate ion exchanger, Na4Ti9O2OoxH20, such as the Na and Ti reactants, the heating time, oven temperature, Na:Ti mole ratio, and heating method, were altered and their effects on Sr2' ion exchange selectivity were examined. For example, the heating time was varied from I day to 2, 3, 7, and 30 days. Although the crystallinity remained the same from the I day to the 2 day sample, as the heating time further increased, the crystallinity improved. The most Sr selective material was the 2 day sample with a Kd (distribution coefficient) of 1.22x 106 MI/g in O.lM Na/ O.OOIM Sr solution. The Kd's steadily decreased as the sample crystallinity increased with a maximum Kd of only 1.6OxlO5 in O.OIM Na/ O.OO I M Sr solution after a heating time of 30 days. However, in a simulated waste such as NCAW, the 2 day sample gave a Kd of only 1.44x 105 MI/g, while the I day sample gave a value of 2.50x 105 . This indicates that the nonatitanate synthesis needs to be uniquely designed to optimize Sr 2+ removal in each specific type of waste to be remediated.

Graziano, Gina Marie

1998-01-01T23:59:59.000Z

260

Ultrafast X-ray and 2-dimensional UV Spectroscopy of TiO2 ...  

Science Conference Proceedings (OSTI)

Presentation Title, Ultrafast X-ray and 2-dimensional UV Spectroscopy of TiO2 Nanoparticles. Author(s), Majed Chergui. On-Site Speaker (Planned), Majed ...

Note: This page contains sample records for the topic "ti rb cs" 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.


261

Microscopic Study on the Interface Reaction between Ti and Al-Zn ...  

Science Conference Proceedings (OSTI)

Presentation Title, Microscopic Study on the Interface Reaction between Ti and Al -Zn Alloy during Ultra-Fast Heat Treatment. Author(s), Yue Zhao, David Nolan, ...

262

Shape Memory Response of NiTiHfPd High Strength and High ...  

Science Conference Proceedings (OSTI)

In this study, shape memory and superelastic properties of NiTiHfPd polycrystalline and single crystalline SMAs as functions of aging temperature and time were ...

263

Preparing SiC-TiB2 Composite via Liquid Phase Sintering  

Science Conference Proceedings (OSTI)

Some research works showed that the composites of SiC-TiB2 had better mechanical properties than monolithic ceramic. In this study, Silicon carbide – titanium ...

264

Nano-laminated Ti3Al Porous Structure Produced by Hot Forging ...  

Science Conference Proceedings (OSTI)

Extending Bulk CALPHAD Methods to Interfaces and Nanomaterials to Help ... Ti3Al Porous Structure Produced by Hot Forging and Selective Dissolution.

265

(Ti,Mg)N Thin Film Coatings Produced Via Physical Vapor Deposition  

Science Conference Proceedings (OSTI)

Magnesium (Mg) doped TiN was prepared via physical vapor deposition to ... Axial Compression of a Hollow Cylinder Filled with a Foam: A Porcupine Quill ...

266

Further Characterization of New NiTi Wire and Rotary Endodontic ...  

Science Conference Proceedings (OSTI)

Presentation Title, Further Characterization of New NiTi Wire and Rotary ... Higher-resolution transmission electron microscopy examination of M-Wire used to ...

267

Cyclability Study of Si/TiN/C Composite Anode with High Rate ...  

Science Conference Proceedings (OSTI)

Presentation Title, Cyclability Study of Si/TiN/C Composite Anode with High Rate Capability for Lithium-Ion Batteries. Author(s), Jiguo Tu, Shuqiang Jiao, ...

268

Wettability of Liquid Aluminum on Carbon/Graphite/TiB2 Composite ...  

Science Conference Proceedings (OSTI)

Presentation Title, Wettability of Liquid Aluminum on Carbon/Graphite/TiB2 ... The Applicability of Carbon Capture and Sequestration in Primary Aluminium ...

269

Aqueous Corrosion Study of Melt-Spun NdFeB Ribbons with TiC ...  

Science Conference Proceedings (OSTI)

Results showed that TiC additions improve corrosion resistance as indicated by lower corrosion rates (icorr) and more noble corrosion potentials. Results also ...

270

Effect of Aging on Mechanical Properties of Ti-Mo-Al Biomedical ...  

Science Conference Proceedings (OSTI)

For the case of Ti-Ni, cold work and aging at intermediate temperatures are utilized to improve shape memory effect through hardening. Therefore, in this work, ...

271

TiO2 Nanowire Solar Cells with Enhanced Energy Harvesting  

Science Conference Proceedings (OSTI)

Presentation Title, TiO2 Nanowire Solar Cells with Enhanced Energy Harvesting. Author(s), Anming Hu, John Wen, Y. Zhou. On-Site Speaker (Planned), Anming ...

272

Microwave-Assisted Synthesis of TiO2 Nanorod Films for Dye ...  

Science Conference Proceedings (OSTI)

Abstract Scope, One of limitations of conventional dye sensitized solar cells ( DSSC) is the use of TiO2 ... Radio Frequency Lamination for Photovoltaic Panels.

273

Evaluation of Long-term Corrosion Behavior of ?-type Ti Alloy in ...  

Science Conference Proceedings (OSTI)

The corrosion rate of Ti-Nb-Ta determined by EIS kept decreasing over a period .... to Enhance Thermal Energy Storage Capacity for Concentrated Solar Power ...

274

G2: Antibacterial Ceramic Fabricated by the Ti-bearing Blast ...  

Science Conference Proceedings (OSTI)

On-Site Speaker (Planned), Ang Tian. Abstract Scope, The comprehensive utilization of Ti-bearing blast furnace slag was a technological problem that was ...

275

Detonation Spraying of TiO2-Ag: Controlling the Phase Composition ...  

Science Conference Proceedings (OSTI)

Presentation Title, Detonation Spraying of TiO2-Ag: Controlling the Phase Composition and Microstructure ... Using Ice to Make Nature Inspired Hybrid Materials.

276

Mechanochemical Behavior of BaNd 2 Ti 4 O 12 Powder in Ball ...  

Science Conference Proceedings (OSTI)

When ball milling BaNd2Ti4O12, a high slurry viscosity reduces the capability of the grinding media to shear, and ...

277

Molecular beam epitaxy of SrTiO3 with a growth window  

E-Print Network (OSTI)

Materials Fundamentals of Molecular Beam Epitaxy (AcademicMolecular beam epitaxy of SrTiO 3 with a growth windowgrowth window in conventional molecular beam epitaxy (MBE)

Stemmer, Susanne

2009-01-01T23:59:59.000Z

278

Reduction of the Ni- and Ti-oxide mixtures by natural gas  

Science Conference Proceedings (OSTI)

In this work, the reduction of Ni- and Ti-oxides by natural gas has been studied. ... Reaction mechanism and reaction rate of Sn evaporation from liquid steel.

279

Effect of TiO2 on the Conduction Heat Transfer of Mold Flux  

Science Conference Proceedings (OSTI)

Symposium, 2nd International Symposium on High-Temperature Metallurgical Processing. Presentation Title, Effect of TiO2 on the Conduction Heat Transfer of

280

Titanium Beryllide (TiBe 12 ) for Fusion Reactors - Programmaster.org  

Science Conference Proceedings (OSTI)

Presentation Title, Titanium Beryllide (TiBe12) for Fusion Reactors. Author(s), Edgar E. Vidal, Christopher K. Dorn. On-Site Speaker (Planned), Edgar E. Vidal.

Note: This page contains sample records for the topic "ti rb cs" 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

the effect of nb, ti, al on precipitation and strengthening behavior of ...  

Science Conference Proceedings (OSTI)

high temperature industries. However, the ceiling temperature for Alloy 718 is 650 because of. ? the instability of main strengthening phase ??-Ni3(Nb,Ti,Al).

282

Study on Heteropolyacids/Ti/Zr Mixed in the Inorganic Composites ...  

Science Conference Proceedings (OSTI)

Symposium, Energy Conversion/Fuel Cells. Presentation Title, Study on Heteropolyacids/Ti/Zr Mixed in the Inorganic Composites for Fuel Cell Electrolytes.

283

Aligned TiO2 Nanotubes as Long Durability Anodes for Lithium-Ion ...  

Science Conference Proceedings (OSTI)

Aligned TiO2 Nanotubes as Long Durability Anodes for Lithium-Ion Batteries · Aniline Coated Carbon Cryogel with Improved Cyclic Stability for Supercapacitor  ...

284

Fabrication of Engineered TiNi Matrix Composites with Near-Zero ...  

Science Conference Proceedings (OSTI)

Functional Composites: Fluorescent Carbon Nanotubes in Silica Aerogel ... Novel Metallo-Organic Derived Ti-Si-Cr-C-N Nanocomposite Coatings: Part II ...

285

Laser Deposited In Situ TiC Reinforced Nickel Matrix Composites  

Science Conference Proceedings (OSTI)

Abstract Scope, A new class of Ni-Ti-C based metal matrix composites has been ... of Metal Matrix Composites via Spark Plasma Sintering for Nuclear Energy ...

286

The Study of Transformations in Titanium and Ti Alloys by Electrical ...  

Science Conference Proceedings (OSTI)

Presentation Title, The Study of Transformations in Titanium and Ti Alloys by Electrical Resistivity Measurement. Author(s), Petr Harcuba, Michal Hájek, Jana ...

287

Effects of Nano-TiC p on the Microstructures and Tensile Properties ...  

Science Conference Proceedings (OSTI)

However, the investigations on the addition of the nano particulates into conventional metal materials are still rare, especially the nano-TiCp into ...

288

Effects of the Ti/Al atomic ratio on the properties of gradient (Ti,Al)N films synthesized by ion beam assisted deposition  

SciTech Connect

Gradient (Ti,Al)N films were prepared on high speed steel (HSS) and Si (111) wafers by using two Ar{sup +} beams to sputter a titanium target and an aluminum target separately, and a third N{sup +} beam to simultaneously bombard the growing film to assist deposition. The effects of the Ti/Al atomic ratio in the films on properties such as hardness, stress, and adhesion strength were investigated systematically. The results indicated that both the hardness and the adhesion of gradient (Ti,Al)N films to steel substrates exhibited {open_quotes}peak{close_quotes} type changes with an increase of the Ti/Al atomic ratio, and a maximum hardness of 3780thinspkgfthinspmm{sup {minus}2} was reached at a Ti/Al ratio of 5.35. The compressive stress of gradient (Ti,Al)N films increased with increasing Al content in the films. It was found that extreme hardness, high adhesion strength and low stress gradient (Ti,Al)N films can be synthesized on low temperature HSS steel by using the ion beam assisted deposition process.

He, X.; Shu, L.; Xie, Z.W. [Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

1999-03-01T23:59:59.000Z

289

Relative x-ray backlighter intensity comparison of ti and ti/sc combination foils driven in double-sided and single-sided laser configuration  

SciTech Connect

Use of multiple backlighter foils and/or double-sided laser interaction geometry with backlit imaging can result in improved backlighter efficiency. An experimental comparison of backlighter intensity for Ti foils and Ti/Sc combination foils in both the one-sided and double-sided laser-interaction configuration is presented. Spectrally-integrated framing camera images show intensity contributions of front and rear backlighter surfaces for both foil types. Analysis of time-resolved x-ray spectra collected from foil targets show the relative contribution of Ti and Sc 2-1 He-like resonance lines to the total backlighter intensity.

Bullock, A B; Landen, O L; Bradley, D K

2000-06-05T23:59:59.000Z

290

Investigation of Ti-doped NaAlH4 by solid-state NMR  

DOE Green Energy (OSTI)

In recent years, the development of Ti-doped NaAlH{sub 4} as a hydrogen storage material has gained attention because of its large weight percentage of hydrogen ({approx}5%) compared to traditional interstitial hydrides. The addition of transition-metal dopants, in the form of Ti-halides, such as TiCl{sub 3}, dramatically improves the kinetics of the absorption and desorption of hydrogen from NaAlH{sub 4}. However, the role that Ti plays in enhancing the absorption and desorption of H{sub 2} is still unknown. In the present study, {sup 27}Al, {sup 23}Na, and {sup 1}H MAS (Magic Angle Spinning) NMR (Nuclear Magnetic Resonance) has been performed to understand the titanium speciation in Ti-doped NaAlH{sub 4}. All experiments were performed on a sample of crushed single crystals exposed to Ti during growth, a sample of solvent-mixed 4TiCl{sub 3} + 112NaAlH{sub 4}, a reacted sample of solvent-mixed TiCl{sub 3} + {sup 3}NaAlH{sub 4} with THF, and a reacted sample of ball-milled TiCl3 + 3NaAlH{sub 4}. The {sup 27}Al MAS NMR has shown differences in compound formation between solvent-mixed TiCl{sub 3} + 3NaAlH{sub 4} with THF and the mechanically ball-milled TiCl{sub 3} + 3NaAlH{sub 4}. {sup 27}Al MAS NMR of the mechanically ball-milled mixture of fully-reacted TiCl{sub 3} + 3NaAlH{sub 4} showed spectral signatures of TiAl{sub 3} while, the solvent-mixed 4TiCl{sub 3} + 112NaAlH{sub 4}, which is totally reacted, does not show the presences of TiAl{sub 3}, but shows the existence of Al{sub 2}O{sub 3}.

Maxwell, R; Majzoub, E; Herberg, J

2003-11-24T23:59:59.000Z

291

TiO2 Nanotubes Filled with NiFe2O4 Quantum Dots and Ni-Fe ...  

Science Conference Proceedings (OSTI)

The obtained TiO2NTs were filled with ... in the temperature range 25-850 °C. The modified TiO2NTs were also tested for ...

292

Pilot-scale production of dicesium hexachloroplutonate (Cs/sub 2/PuCl/sub 6/) and filtrate recovery  

SciTech Connect

The Rocky Flats Plant is introducing the use of dicesium hexachloroplutonate (DCHP) into the Molten Salt Extraction Process (MSE). DCHP (Cs/sub 2/PuCl/sub 6/) extracts americium from molten plutonium metal into a molten calcium chloride matrix. The DCHP is produced by precipitating plutonium (IV) from hydrochloric acid with cesium chloride. Before production of the DCHP began, we performed a pilot-scale test to determine yields, track impurities, and test filtrate recovery for the proposed process. In the course of this study, we determined that impure plutonium oxide (0.80 g/g) dissolved in concentrated HCl is an acceptable source of plutonium for the DCHP. We also determined that dissolved oxide and chloride anion exchange eluate can be mixed for DCHP preparation. We found that DCHP yields average 92-95% at 8M total chloride and are independent of sparging rate and time. Furthermore, we found that drying at 150/degree/C for 5 hr gives <0.1% water in the DCHP only if it is preceeded by extensive air drying. Finally, we proved the efficiency of chloride anion exchange for the recovery of above-discard plutonium from the filtrate. 11 refs., 1 fig., 11 tabs.

Muscatello, A.C.; Stevens, J.R.; Killion, M.E.; Valdez, J.D.; Ames, R.L.

1989-03-15T23:59:59.000Z

293

Grain Refinement in TiC-Ni3Al Composites  

DOE Green Energy (OSTI)

The Cooperative Research and Development Agreement (CRADA) was to develop composites of TiC-Ni{sub 3}Al with refined grain microstructures for application in diesel engine fuel injection devices. Grain refinement is important for improved wear resistance and high strength for the applications of interest. Attrition milling effectively reduces the initial particle size and leads to a reduction of the final grain size. However, an increase in the oxygen content occurs concomitantly with the grinding operation and decreased densification of the compacts occurs during sintering.

Tiegs, T.N.

2001-01-30T23:59:59.000Z

294

Exploration of artificial neural network to predict morphology of TiO2 nanotube  

Science Conference Proceedings (OSTI)

Artificial neural network (ANN) was developed to predict the morphology of TiO"2 nanotube prepared by anodization. The collected experimental data was simplified in an innovative approach and used as training and validation data, and the morphology of ... Keywords: Anodization, Artificial neural network, Morphology, Prediction, TiO2 nanotube

Hongyi Zhang; Jianling Zhao; Yuying Jia; Xuewen Xu; Cencun Tang; Yangxian Li

2012-03-01T23:59:59.000Z

295

Highly ordered TiO2 macropore arrays as transparent photocatalysts  

Science Conference Proceedings (OSTI)

Highly ordered transparent TiO2 macropore arrays were synthesized via a simple glass-clamping method at room temperature. The as-synthesized TiO2 macropore arrays show high transmittance in the visible light region and can be used ...

Yuan Dong; Junfeng Chao; Zhong Xie; Xin Xu; Zhuoran Wang; Di Chen

2012-01-01T23:59:59.000Z

296

Fatigue Crack Growth Characteristics of Thin Sheet Titanium Alloy Ti 6-2-2-2-2  

Science Conference Proceedings (OSTI)

Fatigue crack growth rates of Ti 6-2-2-2-2 as a function of stress ratio, temperature (24 or 177 degrees C), tensile orientation and environment (laboratory air or ultrahigh vacuum) are presented. Fatigue crack growth rates of Ti 6-2-2-2-2 are also compared ...

Smith Stephen W.; Piascik Robert S.

2001-03-01T23:59:59.000Z

297

Li-doped (Ba,Sr)TiO3 thick film interdigital capacitors for microwave applications  

Science Conference Proceedings (OSTI)

Microwave properties of Li-doped (Ba,Sr)TiO"3 thick film interdigital capacitors have been investigated. According to the reported papers, BaSrTiO"3 materials, paraelectric state at the room temperature, have high dielectric permittivity (>500 @ 1MHz) ... Keywords: BST, Microwave properties, Screen printing, Thick film, Tunability

Se-Ho Kim; Jung-Hyuk Koh

2009-01-01T23:59:59.000Z

298

Enhanced photocatalytic activity of Ag microgrid connected Ti O 2 nanocrystalline films  

Science Conference Proceedings (OSTI)

One reason for the high degree of photogenerated carrier recombination was found to be the charge accumulation caused by the uneven reaction area on the photocatalyst surface. The authors connected Ti O 2 nanoparticles with conducting Ag microgrid. Obvious photocatalytic activity improvement (81%) over the pure Ti O 2 was observed

Feng Pan; Junying Zhang; Weiwei Zhang; Tianmin Wang; Chao Cai

2007-01-01T23:59:59.000Z

299

Role of Ti phases in the modulation of border traps at the TiO{sub 2}/n-Si interfaces  

Science Conference Proceedings (OSTI)

Charge accumulation at interfaces is a key issue for the use of high dielectric constant materials in nanoelectronics. In this work, we report the charge accumulation behavior at the TiO{sub 2}/n-Si interfaces formed at various growth temperatures. Growth of TiO{sub 2} in an oxygen deficient environment led to the formation of rutile phase in the as-grown films. The anatase phase was recovered by annealing in air and the ratio of anatase to rutile phase in the TiO{sub 2} films improved considerably. The amount of charge accumulation and the direction of charge injection were studied by obtaining C-V hysteresis curves in the as-grown and the annealed TiO{sub 2} films. It was observed that the amount of accumulated charges decreased as the density of interface border traps dropped considerably due to annealing. X-ray photo-electron spectroscopy revealed the presence of two major phases corresponding to TiO{sub 2} and Ti{sub 2}O{sub 3}, due to the existence of oxygen deficiencies. The annealing in air resulted in appreciable increase in the weight percentage of TiO{sub 2} phase in samples grown at high temperatures. The healing of oxygen vacancies improved with the increase in the weight percentage of TiO{sub 2}. Thus, it was concluded that the accumulated charges were mainly due to oxygen deficiencies and the healing of oxygen defects led to a drop in the interface charges, thus, bringing the interface close to ideal.

Nasim, F.; Ali, A.; Bhatti, A. S. [Centre for Micro and Nano Devices, Department of Physics, Park Road, COMSATS Institute of Information Technology, Islamabad 44000 (Pakistan); Hafizuddin, Mohammad [Department of Physics, University of Kebangsaan, Bangi (Malaysia)

2012-08-15T23:59:59.000Z

300

On the remarkable optical and structural transformations in Mg-Ti-H thin  

NLE Websites -- All DOE Office Websites (Extended Search)

On the remarkable optical and structural transformations in Mg-Ti-H thin On the remarkable optical and structural transformations in Mg-Ti-H thin films Speaker(s): Dana Borsa Date: October 16, 2006 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Venkat Srinivasan In searching for battery electrode materials, Mg-Ti-H thin films triggered much interest with its hydrogen storage capacity of approx. 4 times larger than that of conventional NiMH batteries [1]. Besides this, the same system has also absolutely remarkable optical properties [2]. Highly reflective in the metallic state, the films become highly absorbing upon hydrogen absorption. Mg0.80Ti0.20Hx thin films combine a high absorption (87% of the solar spectrum) with a low thermal emissivity (only 10%), while after removal of hydrogen Mg0.80Ti0.20 absorbs no more than 1/3 of the solar

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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301

Evidence of Photocatalytic Dissociation of Water on TiO2 with Atomic Resolution  

E-Print Network (OSTI)

Photocatalytic water splitting reaction on TiO2 surface is one of the fundamental issues that bears significant implication in hydrogen energy technology and has been extensively studied. However, the existence of the very first reaction step, the direct photo-dissociation of water, has been disregarded. Here, we provide unambiguously experimental evidence to demonstrate that adsorbed water molecules on reduced rutile TiO2(110)-1\\times1 surface can be dissociated under UV irradiation using low temperature scanning tunneling microscopy. It is identified that a water molecule at fivefold coordinated Ti (Ti5c) site can be photocatalytically dissociated, resulting in a hydroxyl at Ti5c and another hydroxyl at bridge oxygen row. Our findings reveal a missing link in the photocatalytic water splitting reaction chain, which greatly contribute to the detailed understanding of underlying mechanism.

Tan, Shijing; Wang, Yang; Zhao, Jin; Zhao, Aidi; Wang, Bing; Luo, Yi; Yang, Jinlong; Hou, J G

2011-01-01T23:59:59.000Z

302

Individual Radiological Protection Monitoring of Utrok Atoll Residents Based on Whole Body Counting of Cesium-137 (137Cs) and Plutonium Bioassay  

SciTech Connect

This report contains individual radiological protection surveillance data developed during 2006 for adult members of a select group of families living on Utrok Atoll. These Group I volunteers all underwent a whole-body count to determine levels of internally deposited cesium-137 ({sup 137}Cs) and supplied a bioassay sample for analysis of plutonium isotopes. Measurement data were obtained and the results compared with an equivalent set of measurement data for {sup 137}Cs and plutonium isotopes from a second group of adult volunteers (Group II) who were long-term residents of Utrok Atoll. For the purposes of this comparison, Group II volunteers were considered representative of the general population on Utrok Atoll. The general aim of the study was to determine residual systemic burdens of fallout radionuclides in each volunteer group, develop data in response to addressing some specific concerns about the preferential uptake and potential health consequences of residual fallout radionuclides in Group I volunteers, and generally provide some perspective on the significance of radiation doses delivered to volunteers (and the general Utrok Atoll resident population) in terms of radiological protection standards and health risks. Based on dose estimates from measurements of internally deposited {sup 137}Cs and plutonium isotopes, the data and information developed in this report clearly show that neither volunteer group has acquired levels of internally deposited fallout radionuclides specific to nuclear weapons testing in the Marshall Islands that are likely to have any consequence on human health. Moreover, the dose estimates are well below radiological protection standards as prescribed by U.S. regulators and international agencies, and are very small when compared to doses from natural sources of radiation in the Marshall Islands and the threshold where radiation health effects could be either medically diagnosed in an individual or epidemiologically discerned in a group of people. In general, the results from the whole-body counting measurements of 137Cs are consistent with our knowledge that a key pathway for exposure to residual fallout contamination on Utrok Atoll is low-level chronic uptake of {sup 137}Cs from the consumption of locally grown produce (Robison et al., 1999). The error-weighted, average body burden of {sup 137}Cs measured in Group I and Group II volunteers was 0.31 kBq and 0.62 kBq, respectively. The associated average, annual committed effective dose equivalent (CEDE) delivered to Group I and Group II volunteers from {sup 137}Cs during the year of measurement was 2.1 and 4.0 mrem. For comparative purposes, the annual dose limit for members of the public as recommended by the National Council on Radiation Protection and Measurements (NCRP) and the International Commission on Radiological Protection (ICRP) is 100 mrem. Consequently, specific concerns about elevated levels of {sup 137}Cs uptake and higher risks from radiation exposure to Group I volunteers would be considered unfounded. Moreover, the urinary excretion of plutonium-239 ({sup 239}Pu) from Group I and Group II volunteers is statistically indistinguishable. In this case, the error-weighted, average urinary excretion of {sup 239}Pu from Group I volunteers of 0.10 {mu}Bq per 24-h void with a range between -0.01 and 0.23 {mu}Bq per 24-h void compares with an error-weighted average from Group II volunteers of 0.11 {mu}Bq per 24-h void with a range between -0.20 and 0.47 {mu}Bq per 24-h void. The range in urinary excretion of {sup 239}Pu from Utrok Atoll residents is very similar to that observed for other population groups in the Marshall Islands (Bogen et al., 2006; Hamilton et al., 2006a; 2006b; 2006c, 2007a; 2007b; 2007c) and is generally considered representative of worldwide background.

Hamilton, T; Kehl, S; Brown, T; Martinelli, R; Hickman, D; Jue, T; Tumey, S; Langston, R

2007-06-08T23:59:59.000Z

303

Performance of LiAlloy/Ag(2)CrO(4) Couples in Molten CsBr-LiBr-KBr Eutectic  

DOE Green Energy (OSTI)

The performance of Li-alloy/CsBr-LiBr-KBr/Ag{sub 2}CrO{sub 4} systems was studied over a temperature range of 250 C to 300 C, for possible use as a power source for geothermal borehole applications. Single cells were discharged at current densities of 15.8 and 32.6 mA/cm{sup 2} using Li-Si and Li-Al anodes. When tested in 5-cell batteries, the Li-Si/CsBr-LiBr-KBr/Ag{sub 2}CrO{sub 4} system exhibited thermal runaway. Thermal analytical tests showed that the Ag{sub 2}CrO{sub 4} cathode reacted exothermically with the electrolyte on activation. Consequently, this system would not be practical for the envisioned geothermal borehole applications.

GUIDOTTI,RONALD A.; REINHARDT,FREDERICK W.

1999-10-18T23:59:59.000Z

304

R ES0 L U TI(it; 1  

NLE Websites -- All DOE Office Websites (Extended Search)

ES0 L U TI(it; 1\ (;. ______ ES0 L U TI(it; 1\ (;. ______ lH T the i\£ '-'yor of tl,e Ctty of AmarHlo i.lli hE'rretr\ IHlthortzeti ~.nd directed to execute on oot~lf of the City ci:~ n,l!lnllo a contract between the Vnited :3rates o.f j\ ITJerica, reoresented by the l:"nited. Statf'8 p, tomie Ener~y CommiluJion. Amari.no .f~rea (,(fice, and dest!5nsted as Contract '1 (2~)-2) 224.9 ar"d the Citj Dr /\r:rarillo. Te:k.1ll8. authorilol.n'l the use of certain oroperty located a.t the .Amarino ,,\ir J'o:rc. Base by the Atorr,ic J~n~r~.v Co.n.lmiesion of the United Staws.. .). .. ~ 1/ . * 13.' .. ·If? . Contract AT(29-2)2249 CONTRACT This CONTRACT, entered into effective as hereinafter provided, by and between THE UNITED STATES OF AMERICA (hereinafter called the "Government

305

Texture and pyramidal slip in Ti, Zr and their alloys  

Science Conference Proceedings (OSTI)

Zirconium, titanium and their alloys have a high anisotropic plastic behavior. One way to show this behavior is to analyze the evolution of the Lankford coefficient (R ([alpha]), values of which are obtained from tensile tests along different directions in the sheet plane). The variation of R([alpha]) can be explained from the crystallographic texture and the active deformation mechanisms. Microstructural observations show that prismatic slip is the most active deformation mode in these materials, but no dimensional change in the [lt][bar c][gt] direction of grains is possible by the activation of the (10[bar 1]0) [lt] 1[bar 2]10[gt] slip alone; so deformation along [0001] has to be accommodated either by (10[bar 1]o) [lt]1[bar 2]13[gt] (or [lt][bar c] + [bar a][gt]) pyramidal slip or by twinning. Many transmission electron microscopy (TEM) studies have shown evidence for [lt][bar c] + [bar a][gt] slip activity, and some authors have reported slip on (1[bar 1]01) planes in Ti alloys. The purpose of this paper is to contribute with another analysis of pyramidal slip activity in hcp textured materials, such as Ti and Zr alloys, and of the hardening mechanisms for this deformation mode. This analysis is performed both in a direct way, by means of TEM observations of deformed samples, and in an indirect way, by different mechanical tests.

Pochettino, A.A.; Gannio, N. (Dept. Ciencias de Materiales, Gcia. Desarroilo, CNEA, Avda. Libertador 8250, 1429 Buenos Aires (Argentina)); Edwards, C.V. (Esc Ing. Mecanica, Pont. Univ. Catolica, Av. Vicuna Mackenna, Santiago de Chile (Chile)); Penelle, R. (Lab. de Metallurgie Structurale, URA CNRS 1107, Bat 413, Univ. Paris XI, 91 405 Orsay (France))

1992-12-15T23:59:59.000Z

306

Hydrogen Permeability of Mulitphase V-Ti-Ni Metallic Membranes  

DOE Green Energy (OSTI)

Development of advanced hydrogen separation membranes in support of hydrogen production processes such as coal gasification and as front end gas purifiers for fuel cell based system is paramount to the successful implementation of a national hydrogen economy. Current generation metallic hydrogen separation membranes are based on Pd-alloys. Although the technology has proven successful, at issue is the high cost of palladium. Evaluation of non-noble metal based dense metallic separation membranes is currently receiving national and international attention. The focal point of the reported work was to evaluate a Group 5A-Ta, Nb, V-based alloy with respect to microstructural features and hydrogen permeability. Electrochemical hydrogen permeation testing of the V-Ti-Ni alloy is reported herein and compared to pure Pd measurements recorded as part of this same study. The V-Ti-Ni was demonstrated to have a steady state hydrogen permeation rate an order of magnitude higher than the pure Pd material in testing conducted at 22 C.

Adams, T. M.; Mickalonis, J.

2005-10-18T23:59:59.000Z

307

27Al and 1H Solid State NMR Studies Show Evidence of TiAl3 and TiH2 in Ti-doped NaAlH4  

DOE Green Energy (OSTI)

Previous X-ray Diffraction (XRD) and Nuclear Magnetic Resonance (NMR) studies on Ti-doped NaAlH{sub 4} revealed the reaction products of two heavily doped (33.3 at.%) samples that were solvent-mixed and mechanically-milled. This investigation revealed that nano-crystalline or amorphous Al{sub 2}O{sub 3} forms from the possible coordination of aluminum with oxygen atom of the furan ring system from added tetrahydrofuran (THF) in the solvent-mixed sample, and that TiAl{sub 3} forms in mechanically-milled samples. The present paper provides a more sophisticated NMR investigation of the these materials. On heavily doped (33.3 at.%) solvent-mixed samples, {sup 27}Al Magic Angle Spinning (MAS) NMR {sup 27}Al multiple quantum MAS (MQMAS) indicates the presence of an oxide layer of Al{sub 2}O{sub 3} on the surfaces of potentially bulk nanocrystalline Ti, nanocrystalline TiAl{sub 3}, and/or metallic aluminum. The {sup 1}H MAS NMR data also indicate the possible coordination of aluminum with the oxygen atom in the THF. On heavily doped samples that were mechanically milled, {sup 27}Al MAS NMR and static NMR confirms the presence of TiAl{sub 3}. In addition, the {sup 1}H MAS NMR and {sup 1}H spin-lattice relaxation (T{sub 1}) measurements are consistent with the presence of TiH{sub 2}. These results are in agreement with recent XAFS measurements indicating both Al and H within the first few coordination shells of Ti in the doped alanate.

Herberg, J; Maxwell, R; Majzoub, E

2005-05-26T23:59:59.000Z

308

Reversible uptake of COS, CS2 and SO2; Ionic liquids with O-alkylxanthate, O-alkylthiocarbonate, and O-alkylsulfite anions  

SciTech Connect

Further development of CO2 binding organic liquids to capture and release carbonyl sulfide, carbon disulfide and sulfur dioxide. This paper investigates a brand new class of ionic liquids which have potential as chemical sensors for acid gas capture. Applications to flue gas scrubbing are discussed with an emphasis on capture and release of COS, CS2 and SO2 with amidine and guanidine bases with alcohols. Formal spectroscopic characterization is presented.

Heldebrant, David J.; Yonker, Clement R.; Jessop, Philip G.; Phan, Lam

2009-08-14T23:59:59.000Z

309

{sup 137}Cs concentration in soil samples from an early survey of Hiroshima atomic bomb and cumulative dose estimation from the fallout  

Science Conference Proceedings (OSTI)

Low background gamma-ray measurement has been performed to determine the {sup 137}Cs content in soil samples collected in a very early survey of the Hiroshima atomic bomb. These soil samples were collected just 3 d after the explosion within 5 km from the hypocenter and were not exposed to the global fallout from nuclear weapon tests. Out of 22 samples, {sup 137}Cs was detected for 11 samples, and their radionactivities ranged from 0.16-10.6mBq g{sup {minus}1} at the time of the measurement. A comparison of the {sup 137}Cs deposition with the rainfall area within Hiroshima city indicates that the rainfall area was wider than the previously proposed one. Cumulative exposure by the fallout has been estimated to be 0.31 mC kg{sup {minus}1} (0.12 R) 1.0 mC kg{sup {minus}1} (4 R) in the heavy fallout area. 20 refs., 6 figs., 2 tabs.

Shizuma, Kiyoshi; Iwatani, Kazuo; Hasai, Hiromi [Hiroshima Univ., Kagamiyama (Japan)] [and others

1996-09-01T23:59:59.000Z

310

FREQUENCY DISTRIBUTIONS OF 90SR AND 137CS CONCENTRATIONS IN AN ECOSYSTEM OF THE 'RED FOREST' AREA IN THE CHERNOBYL EXCLUSION ZONE  

Science Conference Proceedings (OSTI)

In the most highly contaminated region of the Chernobyl Exclusion Zone: the 'Red Forest' site, the accumulation of the major dose-affecting radionuclides ({sup 90}Sr and {sup 137}Cs) within the components of an ecological system encompassing 3,000 m{sup 2} were characterized. The sampled components included soils (top 0-10 cm depth), Molina caerulea (blue moor grass), Camponotus vagus (carpenter ants) and Pelobates fuscus (spade-footed toad). In a comparison among the components of this ecosystem, the {sup 90}Sr and {sup 137}Cs concentrations measured in 40 separate grids exhibited significant differences, while the frequency distribution of the values were close to a logarithmically normal leptokurtic distribution with a significant right-side skew. While it is important to identify localized areas of high contamination or 'hot spots,' including these values in the arithmetic mean may overestimate the exposure risk. In component sample sets that exhibited logarithmically normal distribution, the geometrical mean more accurately characterizes a site. Ideally, risk assessment is most confidently achieved when the arithmetic and geometrical means are most similar, meaning the distribution approaches normal. Through bioaccumulation, the highest concentrations of {sup 90}Sr and {sup 137}Cs were measured in the blue moor grass and spade-footed toad. These components also possessed distribution parameters that shifted toward a normal distribution.

Farfan, E.; Jannik, T.; Caldwell, E.

2011-10-01T23:59:59.000Z

311

Effect of Aging Heat Treatments on Ni52Ti48 Shape Memory Alloy  

E-Print Network (OSTI)

Ni-rich NiTi shape memory alloys (SMAs) are capable of attaining a wide range of transformation temperatures depending on the heat treatment conditions and superior thermo-mechanical cycling stability, which are desired for repeated solid-state actuation. High Ni-content Ni-rich SMAs have very low transformation temperatures in a solutionized condition due to the high Ni-content of the matrix. Slow cooling (furnacecooling) from solutionizing temperature and additional aging heat treatments result in the formation of Ni-rich precipitates such as Ni4Ti3, Ni3Ti2 and Ni3Ti and increase transformation temperatures above ambient by depleting excess Ni from the matrix. However, the precipitates do not undergo a martensitic phase transformation and they decrease the transformation strain by reducing the volume fraction of the material capable of transforming. Meanwhile, recent preliminary work shows that Ni3Ti precipitates dominate fatigue failure. The objectives of the present study are: (1) to eliminate Ni3Ti but still have Ni4Ti3 precipitates, which are responsible for the dimensional stability and increase transformation temperatures, (2) to investigate the effect of heat treatments on the transformation strain, and (3) to select single variant Ni4Ti3 precipitates through constrained aging for the formation of oriented internal stress and eventually obtain twoway shame memory effect (TWSME) and enhanced dimensional stability. Based on these objectives, the effect of aging heat treatment on transformation temperatures, microstructural evolution, and shape memory behavior were investigated for a Ni52Ti48 shape memory alloy (SMA) by using differential scanning calorimetry (DSC), optical microscopy, scanning electron microscopy (SEM), and thermo-mechanical testing, including isobaric heating-cooling experiments under various stress levels. It was observed that solutionizing at 900 degree C for 24 hours eliminated Ni3Ti type precipitates, but additional aging heat treatments are needed to form Ni4Ti3 precipitates to increase transformation temperatures. Furnace-cooling and additional aging heat treatment results in the multi-stage martensitic transformation due to chemical and stress inhomogeneities in the microstructure. Aging of the controlled furnace-cooled material at 400 degree C for 48 hours resulted in the highest transformation temperatures among all processing conditions investigated due to the combination of Ni3Ti precipitates and 27 percent volume fraction of the Ni4Ti3 precipitates, which led to the depletion of Ni from the transforming matrix. However, since overaging results in losing coherency of the precipitates, dimensional stability during isobaric thermal cycling was negatively impacted.

Akin, Erhan

2010-08-01T23:59:59.000Z

312

154 .., , .., Cs-137  

E-Print Network (OSTI)

E. 12 Hall, Harlan G. 25 Handler, Alfred M. 25 Heppner, John B. 5 Hix, Raymond L. 2 Hodges, Amanda C Shoemaker, Dewayne D. 25 Silhacek, Donald L. 25 Sivinski, John M. 25 Skelley, Paul 24 Smartt, Chelsea T. 25 C. 12 Lounibos, L.P. 2 Richards, Stephanie L. 12 Smartt, Chelsea T. Research and Education Centers

313

cs.wisc.edu  

E-Print Network (OSTI)

Jan 2, 2008 ... The goal is to search for important patterns of multiple risk factors among a very large number ..... a constant term are entered in the trial model.

314

Ts&Cs FP  

NLE Websites -- All DOE Office Websites (Extended Search)

1-03-2010) Title: Standard Terms and Conditions for Firm-Fixed Price Contracts Owner: Procurement Policy & Quality Dept Initial Release Date: 11310 Page 1 of 17 PPQD-TMPLT-008R00...

315

cs.wisc.edu  

E-Print Network (OSTI)

starting with Fukushima and Pang's analysis [8] of the smoothing scheme of Facchinei. 2 ... Lin and Fukushima [18] have studied the issue of iden- tifying active ...

316

Effect of the top electrode materials on the resistive switching characteristics of TiO{sub 2} thin film  

Science Conference Proceedings (OSTI)

Various metals, such as Pt, stainless steel (SUS), Al, Ni, and Ti, were used as a top electrode (TE) to evaluate the dependency of the resistive switching characteristics on the TE of the metal/TiO{sub 2}/Pt structure. The variation of the chemical composition of TiO{sub 2} in the metal/TiO{sub 2}/Pt structure before and after switching was examined to identify the factors affecting the resistive switching characteristics of the samples with various TE materials. In the case of TE/TiO{sub 2}/Pt structures showing unstable resistive switching behavior, e.g., those with the Al, Ni, and Ti TEs, secondary ion mass spectrometry revealed an increase in the oxygen concentration at the interface area between the TE metal and TiO{sub 2}. This suggests that the oxidation reaction at the interface between the TE metal and TiO{sub 2} might cause the TE/TiO{sub 2}/Pt structure to exhibit unstable resistive switching characteristics. According to these results, the oxidation reaction at the interface between the metal TE and TiO{sub 2} thin film is a primary factor affecting the resistive switching characteristics of TiO{sub 2}-based Resistive Random Access Memory devices.

Oh, Sang Chul [Department of Nano-Semiconductor Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Jung, Ho Yong [Department of Material Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of); R and D Division, Hynix Semiconductor Inc., Cheongju 361-725 (Korea, Republic of); Lee, Heon [Department of Nano-Semiconductor Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Department of Material Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of)

2011-06-15T23:59:59.000Z

317

TiO{sub 2}/carbon nanotube hybrid nanostructures: Solvothermal synthesis and their visible light photocatalytic activity  

Science Conference Proceedings (OSTI)

MWCNT/TiO{sub 2} hybrid nanostructures were prepared via solvothermal synthesis and sol-gel method with benzyl alcohol as a surfactant. As-prepared hybrid materials were characterized by X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectra and X-ray photoelectron spectroscopy. The results showed that MWCNTs were uniformly decorated with anatase nanocrystals in solvothermal condition, but MWCNTs were embedded in a majority of TiO{sub 2} nanoparticles by sol-gel method. When the weight ratio of MWCNTs to TiO{sub 2} was 20%, MWCNT/TiO{sub 2} hybrid nanostructures prepared by solvothermal synthesis exhibited higher visible-light-driven photocatalytic activity than that prepared by sol-gel method. Post-annealing of MWCNT/TiO{sub 2} nanostructures at 400 deg. C resulted in the formation of the carbonaceous Ti-C bonds on the interface between TiO{sub 2} and MWCNTs, which enhanced the photoabsorbance of the hybrid materials in the visible light region and improved the visible-light degradation efficiency of methylene blue. - Graphical abstract: MWCNT/TiO{sub 2} nanostructures have been prepared by solvothermal method, which exhibited higher visible-light-driven photocatalytic activity than that prepared by sol-gel method. The carbonaceous Ti-C bonds on the interface between TiO{sub 2} and MWCNTs enhanced the photoabsorbance of the hybrid materials in the visible light region. Highlights: > Anatase TiO{sub 2} nanoparticles were anchored on CNTs surface uniformly via solvothermal method {yields} The morphology facilitated the electron transfer between CNTs and TiO{sub 2} {yields} Ti-C bonds extended the absorption of MWCNT/TiO{sub 2} to the whole visible light region. > The hybrid nanostructures showed enhanced visible-light induced photocatalytic activity.

Tian Lihong [College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072 (China); College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062 (China); Ye Liqun [College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072 (China); Deng Kejian [Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, South-Central University for Nationalities, Wuhan 430074 (China); Zan Ling, E-mail: irlab@whu.edu.cn [College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072 (China)

2011-06-15T23:59:59.000Z

318

XAFS study of CoxTi?-xO?-x-anatase  

SciTech Connect

Co doped TiO? anatase is a promising candidate dilute magnetic semiconductor (DMS). DMS materials have potential applications in spintronics devices. These utilize the spin of carriers, and offer the promise of new devices with enhanced functionality. The application of DMS materials to spintronics is as spin injectors. These materials can have spin-polarized states in their valence or conduction bands. At interfaces with nonmagnetic semiconductors they can then be used for spin polarized carrier injection, allowing for the fabrication of novel devices utilizing spin. Theory and measurements indicate that they can be much more efficient spin injectors than ferromagnetic metals. This report describes some recent XAFS studies of these materials using the PNC-CAT beamlines at the APS.

Heald, Steve M.; Chambers, Scott A.; Droubay, Timothy

2005-01-01T23:59:59.000Z

319

Model NbTi Helical Solenoid Fabrication and Test Results  

Science Conference Proceedings (OSTI)

A program to develop model magnets for a helical cooling channel is under way at Fermilab. In the first steps of a planned sequence of magnets, two four-coil helical solenoid models with 300 mm aperture have been fabricated and tested. These two models, HSM01 and HSM02, used insulated NbTi Rutherford cable wound onto stainless steel rings with spliceless transitions between coils. Strip heaters were included for quench protection of each coil, and the coils were epoxy-impregnated after winding inside the support structures. Based on the results of the first model the second model was made using a cable with optimized cross-section, improved winding and epoxy-impregnation procedures, enhanced ground insulation, and included heat exchange tubing for a test of conduction cooling. We report on the results and lessons learned from fabrication and tests of these two models.

Andreev, N.; Barzi, E.; Chlachidze, G.; Evbota, D.; Kashikhin, V.S.; Kashikhin, V.V.; Lamm, M.J.; Makarov, A.; Novitski, I.; Orris, D.F.; Tartaglia, M.A.; /Fermilab

2011-09-01T23:59:59.000Z

320

The investigation of die-pressing and sintering behavior of ITP CP-Ti and Ti-6Al-4V powders  

SciTech Connect

This paper investigated the die-pressing and sintering behavior of the low-cost CP-Ti and Ti-6Al- 4V powders made by the Armstrong Process . The Armstrong powders have an irregular coral like, dendritic morphology, with a dendrite size of approximately 2-5 m. As-received as well as milled powders were uniaxially pressed at designated pressures up to 690 MPa to form disk samples with different aspect ratios. In the studied pressure range, an empirical powder compaction equation was applied to linearize the green density pressure relationship, and powder compaction parameters were obtained. The Armstrong Ti-64 powder exhibited a significantly higher sinterability than the CP-Ti powder. This was explained to be due to the higher diffusivity of V at the sintering temperature. The Ti-64 samples with a green density of 71.0% increased to 99.6% after sintering at 1300oC for 1 hour. An ex-situ technique was used to track the powder morphology change before and after sintering.

Chen, Wei [ORNL; Yamamoto, Yukinori [ORNL; Peter, William H [ORNL; Clark, Michael B [ORNL; Nunn, Stephen D [ORNL; Kiggans, Jim [ORNL; Muth, Thomas R [ORNL; Blue, Craig A [ORNL; Williams, James C [Ohio State University; Fuller, Brian [International Titanium Powder; Akhtar, Kamal [International Titanium Powder

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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.


321

Benefits and technological challenges in the implementation of TiO2-based  

NLE Websites -- All DOE Office Websites (Extended Search)

Benefits and technological challenges in the implementation of TiO2-based Benefits and technological challenges in the implementation of TiO2-based ultraviolet photocatalytic oxidation (UVPCO) air cleaners Title Benefits and technological challenges in the implementation of TiO2-based ultraviolet photocatalytic oxidation (UVPCO) air cleaners Publication Type Conference Proceedings Year of Publication 2008 Authors Hodgson, Alfred T., Hugo Destaillats, Toshifumi Hotchi, and William J. Fisk Conference Name Indoor Air 2008 Pagination 17-22 Date Published August 2008 Publisher Indoor Air, Paper ID: 297 Conference Location Copenhagen, Denmark Abstract Indoor air cleaners based on TiO2 photocatalytic oxidation of organic pollutants are a promising technology to improve or maintain indoor air quality while reducing ventilation energy costs. We evaluated the performance of a pilot scale UVPCO air cleaner under realistic conditions in single pass and recirculation modes

322

Phase Transformation and Equilibrium Diagram of Ti-Al-Nb Ternary ...  

Science Conference Proceedings (OSTI)

The phase type and distribution range of Ti-Al-Nb ternary alloy, as well as calculated phase diagram, were directly obtained by TC calculation, as a instruction of ...

323

Mixed nanostructured Ti-W oxides films for efficient electrochromic windows  

Science Conference Proceedings (OSTI)

With the aim to enhance the electrochromic (EC) efficiency and electrochemical stability of electrochromic devices (ECD), mixed nanostructured TiO2/WO3 films were prepared by an electrochemical deposition method with the purpose ...

Nguyen Nang Dinh; Dang Hai Ninh; Tran Thi Thao; Truong Vo-Van

2012-01-01T23:59:59.000Z

324

Synthesis and Analysis of TiO2-Oligonucleotide Hybrid Nanoparticles  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthesis and Analysis of TiO2-Oligonucleotide Hybrid Nanoparticles Synthesis and Analysis of TiO2-Oligonucleotide Hybrid Nanoparticles New developments in nanotechnology offer the creation of chemical-biological hybrid nanocomposites, which can be introduced into cells to initiate intracellular processes or biochemical reactions. Researchers from Northwestern University Medical Center (Chicago, IL) and Argonne National Laboratory synthesized TiO2-oligonucleotide nanocomposites made of DNA oligonucleotides attached to 45-Ã… TiO2 nanoparticles and tested them by using the 2-ID-E x-ray beamline at the X-ray Operations and Research sector 2 of the APS. A key benefit of nanocomposites is that they could advance medical biotechnology and open new doors in chemistry and materials sciences. Scan of a 21 x 21-m area with a single nucleus containing 3.6 x 106 nanoparticles.

325

NiTiHf High-Temperature Shape-Memory Alloys for near Term ...  

Science Conference Proceedings (OSTI)

Development of a SMA-Based Drive Unit for Prehension Orthoses to Support Disabled People · Effect of H in Metals and Alloys: An Application to bcc W and NiTi ...

326

Characterization of New Phases in the Ti-Pt System Relevant to ...  

Science Conference Proceedings (OSTI)

Development of a SMA-Based Drive Unit for Prehension Orthoses to Support Disabled People · Effect of H in Metals and Alloys: An Application to bcc W and NiTi ...

327

Structure-Property Relationships for Ni-Ti-Pt High Temperature ...  

Science Conference Proceedings (OSTI)

Development of a SMA-Based Drive Unit for Prehension Orthoses to Support Disabled People · Effect of H in Metals and Alloys: An Application to bcc W and NiTi ...

328

D-10: The Effect of Molybdenum on Nb,Ti(C,N) Precipitate Evolution ...  

Science Conference Proceedings (OSTI)

The effects of molybdenum on niobium-bearing carbonitride interfacial ... D-7: Quantification of Compositional Effects on Transformation Kinetics in High ... D-9: Study of Shear Behavior of Al, TiN, and Their Interface Using ab intio Method.

329

Reactivity of Ti2AlC with SiC Fibers and Powders up to ...  

Science Conference Proceedings (OSTI)

Herein we investigated the reactivity of Ti2AlC [3ONE2] with SiC fibers [Avco Specialty Materials and Nippon Carbon Co.] and fine SiC powders [Superior ...

330

Colossal dielectric constant and relaxation behaviors in Pr:SrTiO{sub 3} ceramics  

Science Conference Proceedings (OSTI)

Sr{sub 1-x}Pr{sub x}TiO{sub 3} ceramics (0.00{<=}x{<=}0.03) were prepared by a traditional solid-state reaction method. Two relaxation processes (marked as A and B) of the Sr{sub 0.09}Pr{sub 0.01}TiO{sub 3} ceramics were investigated by analyzing the E{sub a} values obtained from the Arrhenius law. Colossal dielectric constant (CDC) was first obtained in Sr{sub 0.09}Pr{sub 0.01}TiO{sub 3} ceramics, whose permittivity was up to 3000 (1 kHz, room temperature), greater than that of pure SrTiO{sub 3} ceramics and samples with more Pr addition (x=0.02 and 0.03). This CDC behavior was related to the internal barrier layer capacitance mechanism.

Liu Cheng; Liu Peng; Zhou Jianping; Su Lina; Cao Lei [College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062 (China); He Ying; Zhang Huaiwu [State Key Laboratory of Electronic Thin Film and Intergrated Devices, University of Electronic Science and Technology of China, Chengdu 610054 (China)

2010-05-15T23:59:59.000Z

331

Effect of Milling Parameters on the Dehydrogenation Properties of the Mg-Ti-H system  

DOE Green Energy (OSTI)

Magnesium-based alloys are promising candidates as potential hydrogen storage materials due to their inherent high hydrogen contents. Small particle size which can be achieved by milling, and small amounts of transition-metal compounds as catalysts result in increased hydrogen release/uptake kinetics. In this work, we examined the effects of various milling parameters and TiH2 content on the dehydrogenation properties of the Mg-Ti-H system. The samples were prepared with different amounts of TiH2 using various milling methods and conditions. The activation energy and the enthalpy change of dehydrogenation of the milled samples were determined by Thermogravimetric Analysis (TGA) and Differential Thermal Analyzer (DTA). The results indicated that the activation energy and enthalpy change of MgH2 dehydrogenation were significantly reduced when 9.1 mol % of TiH2 was added to it and the mixture was milled in a dual planet

Choi, Young Joon; Lu, Jun; Sohn, Hong Yong; Fang, Zhigang Zak; Ronnebro, Ewa

2009-11-05T23:59:59.000Z

332

Ian Foster, Ti Leggett, Mike Papka, Mike Wilde Win the Analytics...  

NLE Websites -- All DOE Office Websites (Extended Search)

Ti Leggett, Mike Papka, and Mike Wilde were part of the team that won the Analytics Challenge at SC07 for presenting a new approach for protecting cyberinfrastructure. The...

333

U.S. Department of Energy DOE/PC89659-TI THE COAL REBURNING FOR  

NLE Websites -- All DOE Office Websites (Extended Search)

U.S. Department of Energy DOEPC89659-TI THE COAL REBURNING FOR CYCLONE BOILER NO X CONTROL DEMONSTRATION PROJECT A DOE ASSESSMENT Prepared by: The Office of Clean Coal technology...

334

Self-assembled TiO2-Graphene Hybrid Nanostructures for Enhanced Li-ion Insertion  

SciTech Connect

We used anionic sulfate surfactants to assist the stabilization of graphene in aqueous solutions and facilitate the self-assembly of in-situ grown nanocrystalline TiO2, rutile and anatase, with graphene. These nanostructured TiO2-graphene hybrid materials were used for investigation of Li-ion insertion properties. The hybrid materials showed significantly enhanced Li-ion insertion/extraction in TiO2. The specific capacity was more than doubled at high charge rates, as compared with the pure TiO2 phase. The improved capacity at high charge-discharge rate may be attributed to increased electrode conductivity in presence of a percolated graphene network embedded into the metal oxide electrodes.

Wang, Donghai; Choi, Daiwon; Li, Juan; Yang, Zhenguo; Nie, Zimin; Kou, Rong; Hu, Dehong; Wang, Chong M.; Saraf, Laxmikant V.; Zhang, Jiguang; Aksay, Ilhan A.; Liu, Jun

2009-04-01T23:59:59.000Z

335

The progress of TiO2 nanocrystals doped with rare earth ions  

Science Conference Proceedings (OSTI)

In the past decades, TiO2 nanocrystals (NCs) have been widely studied in the fields of photoelectric devices, optical communication, and environment for their stability in aqueous solution, being nontoxic, cheapness, and so on. Among the three ...

Hai Liu; Lixin Yu; Weifan Chen; Yingyi Li

2012-01-01T23:59:59.000Z

336

An Orography-Associated Extreme Rainfall Event during TiMREX: Initiation, Storm Evolution, and Maintenance  

Science Conference Proceedings (OSTI)

This study investigates a long-duration mesoscale system with extremely heavy rainfall over southwest Taiwan during the Terrain-influenced Monsoon Rainfall Experiment (TiMREX). This mesoscale convective system develops offshore and stays quasi-...

Weixin Xu; Edward J. Zipser; Yi-Leng Chen; Chuntao Liu; Yu-Chieng Liou; Wen-Chau Lee; Ben Jong-Dao Jou

2012-08-01T23:59:59.000Z

337

Fabrication and Characterization of Oriented Fe-Y2Ti2O7 Interfaces  

Science Conference Proceedings (OSTI)

... created by electron beam deposition of Fe on {111} Y2Ti2O7 bulk single crystal surfaces. ... Characterizing Complex Metal-oxide Interfaces via Virtual Diffraction ... Microstructurally Explicit Study of Trasport Phenomena in Uranium Oxide.

338

Preparation of Highly Crystalline TiO2 Nanostructures by Acid ...  

Science Conference Proceedings (OSTI)

Aug 11, 2010 ... Figure 1 shows the typical TEM images of the Hex-. ncTiO2/CTAB .... band energy of 3.2 and 3.0 eV, respectively [1]. The valance band of ...

339

Improving Stress Rupture Life of Alloy 718 by Optimizing Al, Ti ... - TMS  

Science Conference Proceedings (OSTI)

IhlPRO\\.'IIVG STRESS RUPTURE LIFE OF ALLOY 718 BY. OPTIXllZING AL, TI, P AND B CONTENTS. W. D. Cao and R. L. Kennedy. ,All\\ ac. An Allegheny ...

340

TiO2-based photocatalytic process for purification of polluted water: bridging fundamentals to applications  

Science Conference Proceedings (OSTI)

Recent years have witnessed a rapid accumulation of investigations on TiO2-based photocatalysis, which poses as a greatly promising advanced oxidation technology for water purification. As the ability of this advanced oxidation process is ...

Chuan Wang, Hong Liu, Yanzhen Qu

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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.


341

The development and synthetic applications of Ti- and Pd-catalyzed processes  

E-Print Network (OSTI)

Chapter 1. Ti-Catalyzed Asymmetric Reduction of Aromatic Heterocycles A method for the highly selective asymmetric reduction of quinoxalines and quinazolines was developed. This complements technologies developed by others ...

Hyde, Alan M. (Alan Michael)

2009-01-01T23:59:59.000Z

342

Microstructure Formation in Ti3SiC2-Cu Composites Produced by ...  

Science Conference Proceedings (OSTI)

Under low-energy milling, (3-5) vol.%Ti3SiC2–Cu composite particles of platelet morphology formed, which could be easily SPS-ed to 92-95% relative density.

343

Magnetoresistance in nanostructured Tb/Ti and Tb/Si multilayers  

SciTech Connect

Magnetic, magnetoresistive and structural properties were studied for [Tb/Ti]{sub n} and [Tb/Si]{sub n} multilayers which were prepared by rf-sputtering. The thickness of the Tb layers varied from 1.5 to 12 nm. The thickness of 2 nm nonmagnetic spacers of Ti or Si was kept constant. Both anisotropic and isotropic magnetoresistance was observed in [Tb/Ti]{sub n} and [Tb/Si]{sub n} multilayers. A decrease in the thickness of the terbium layers led to a decrease in the anisotropic contribution to the total magnetoresistance. The negative isotropic magnetoresistanse in [Tb/Ti]{sub n} and [Tb/Si]{sub n} multilayers can be attributed to the giant magnetoresistance (GMR) and/or high field isotropic magnetoresistance. The structure of the samples of both types enabled the existence of the GMR effect.

Svalov, A. V.; Kurlyandskaya, G. V. [Dpto. Electricidad y Electronica, Universidad del Pais Vasco (UPV-EHU), 48080 Bilbao (Spain); Ural State University A.M. Gorky, 620083 Ekaterinburg (Russian Federation); Vas'kovskiy, V. O.; Sorokin, A. N. [Ural State University A.M. Gorky, 620083 Ekaterinburg (Russian Federation); Diercks, D. [Center for Advanced Research and Technology, University of North Texas, Denton, Texas 76203-5017 (United States)

2011-01-15T23:59:59.000Z

344

Effect factors of benzene adsorption and degradation by nano-TiO2 immobilized on diatomite  

Science Conference Proceedings (OSTI)

Difference between adsorption of benzene by diatomite and nano-TiO2 immobilized on diatomite was investigated. And effects of temperature, light intensity, relative humidity, and initial benzene concentration on adsorption and degradation ...

Lijun Cheng, Yong Kang, Guishui Li

2012-01-01T23:59:59.000Z

345

Effects of Processing Parameters on Macrozone Formation in Ti-6Al ...  

Science Conference Proceedings (OSTI)

Composition Design of Multi-Component ?-Ti Alloys Based on a Cluster Model · Consolidation of Blended Titanium/Magnesium Powders by Microwave Processing ... Rheological Properties of Feedstock Composed of Titanium Alloy Powder ...

346

Gas-supported high-photoactivity TiO2 nanotubes  

Science Conference Proceedings (OSTI)

By changing hydrothermal condition and post-heat-treatment temperature, silica-coated TiO2 nanotubes are obtained successfully. The effects of gas-supported process on tubular morphology, crystallinity, and photocatalytic activity are discussed. ...

Sheng Wang, Tao Wang, Yuanwei Ding, Youfeng Xu, Qiying Su, Yanlong Gao, Guohua Jiang, Wenxing Chen

2012-01-01T23:59:59.000Z

347

Efficient multi?keV x?ray sources from Ti?doped aerogel targets  

Science Conference Proceedings (OSTI)

We have measured the production of hv ? 4.7 keV x?rays from low?density Ti?doped aerogel (? ? 3 mg/cc) targets at the OMEGA laser facility (University of Rochester)

K. B. Fournier; C. Constantin; G. Gregori; M. C. Miller; C. A. Back; L. J. Suter; J. Davis; J. Grun

2004-01-01T23:59:59.000Z

348

Visible-Light Water-Splitting Performance of TiO - Programmaster.org  

Science Conference Proceedings (OSTI)

Presentation Title, Visible-Light Water-Splitting Performance of TiO2 ... Ammonia Borane for Chemical Hydrogen Storage: Effect of Nano-Confinement ... Thermodynamic Characterization on Hydrogen Absorption and Desorption Reactions of ...

349

Strain dependencies of energetic, structural, and polarization properties in tetragonal (PbTiO3)1/(SrTiO3)1 and (BaTiO3)1/(SrTiO3)1 superlattices: a comparative study with bulks  

E-Print Network (OSTI)

First-principles density functional calculations are performed to investigate the interplay between inplane strains and interface effects in 1by1 PbTiO3/SrTiO3 and BaTiO3/SrTiO3 superlattices of tetragonal symmetry. One particular emphasis of this study is to conduct side-by-side comparisons on various ferroelectric properties in short-period superlattices and in constituent bulk materials, which turns out to be rather useful in terms of obtaining valuable insight into the different physics when ferroelectric bulks form superlattices. The various properties that are studied in this work include the equilibrium structure, strain dependence of mixing energy, microscopic ferroelectric off-center displacements, macroscopic polarization, piezoelectric coeffcients, effective charges, and the recently formulated k-dependent polarization dispersion structure. The details of our findings are rather lengthy, and are summarized in Sec. IV.

Yao, Yanpeng

2010-01-01T23:59:59.000Z

350

Ferroelectric Self-assembled PbTiO3 Perovskite Nanostructures...  

NLE Websites -- All DOE Office Websites (Extended Search)

For this, samples were deposited onto conductive Nb-doped (100)SrTiO3 substrates. Local piezoelectric and phase hysteresis loops were measured in the regions of the coating where...

351

Variation of electrical resistance in superelastic NiTi for sensor applications  

E-Print Network (OSTI)

Nickel-Titanium (NiTi) is a most commonly known as a heat-activated shape memory alloy. However, the material sometimes displays a constant-temperature property called "superelasticity." A superelastic material is one which ...

Russo, Analisa

2008-01-01T23:59:59.000Z

352

Enhancing solar photocatalytic detoxification by adsorption of porphyrins onto TiO sub 2  

DOE Green Energy (OSTI)

Titanium dioxide (TiO{sub 2}) is a known photocatalyst for solar detoxification of water containing organic contaminants including PCB's and dioxins. Unfortunately, the UV light used by the photocatalyst only comprises about 4% of the strong spectrum. Metalloporphyrins strongly absorb in the visible and near infrared region. Using visible light, we have investigated Ni(II) uroporphyrin (NiUroP), Sn(IV)Cl{sub 2} uroporphyrin (SnUroP) and Sn(IV)Cl{sub 2} tetrakis(p-carboxyphenyl) porphyrin (SnTCPP) as possible enhancers of destruction of a model organic compound, salicylic acid (SA), by means of photosensitization of colloidal TiO{sub 2} particles. All three porphyrins are found to adsorb reversibly onto the colloidal TiO{sub 2} upon variation of pH. Adsorption of porphyrins results in the increased colloidal stability of fine TiO{sub 2} particles in the pH range 5--8. While NiUroP on TiO{sub 2} does not show any enhancement of photodestruction, the adsorption of SnUroP increases the destruction rate compared to that of the bare TiO{sub 2} surface. The effect of ambient oxygen on the observed photolability of the Sn porphyrins and enhancement of photodestruction of SA was also investigated. SnTCPP does not photodecompose upon illumination either in the presence or absence of TiO{sub 2}, but neither does it bind to the photocatalyst at pH 6. At pH 4.5 it adsorbs onto TiO{sub 2} but it also photodecompose at this pH. We are attempting to stabilize the adsorbed porphyrins by adding suitable peripheral substituents onto the porphyrin macrocycle. 27 refs., 6 figs.

Majumder, S.A.; Ondrias, M.R. (New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemistry); Prairie, M.R.; Shelnutt, J.A. (Sandia National Labs., Albuquerque, NM (United States))

1991-01-01T23:59:59.000Z

353

Nanoindentation Studies Of Hard Nanocomposite Ti-B-N Thin Films  

Science Conference Proceedings (OSTI)

Titanium boron nitride (Ti-B-N) films were deposited by reactive magnetron sputtering using single Titanium diboride (TiB{sub 2}) target in different Ar-N{sub 2} gas mixtures. The influence of N{sub 2}:Ar ratio on the microstructure and mechanical properties of the deposited films have been investigated. Atomic force microscopy analysis indicated the grain size decreases with incorporation of nitrogen in the films. Nanoindentation studies have shown the hardness decreases with nitrogen incorporation.

Rupa, P. Karuna Purnapu [Non Ferrous Materials Technology Development Center, Kanchanbagh, Hyderabad (India); Chakraborty, P. C. [Department of Metallurgy and Materials Science, Jadavpur University, Kolkata (India); Mishra, Suman Kumari [National Metallurgical Laboratory, Jamshedpur India (India)

2011-12-12T23:59:59.000Z

354

Interfaces in Ti[sub 3]Al composites reinforced with sigma SiC fibres  

Science Conference Proceedings (OSTI)

When SCS-6 fibers are used for reinforcing Ti[sub 3]Al matrices, a [beta]-depleted zone is often found in the matrix adjacent to the interface, varying from 3 to 7 [mu]m in thickness depending on the composition of the matrix. The cause for such depletion is believed to be the migration of the [beta] stabilizer, Nb, from the adjacent matrix into the reaction zone, which forms Nb-containing compounds such as (Ti,Nb)C and (Ti,Nb)[sub 5]Si[sub 3]. The depletion of [beta] near the interface can enhance the propensity for interfacial cracking as the more brittle [alpha][sub 2] phase is enriched. Here, the authors present a study of the interfaces in a Ti[sub 3]Al/SiC Sigma fiber composite. The reaction products, changes in microstructure and reaction kinetics are compared with Ti-6Al-4V matrix containing Sigma fibers and Ti[sub 3]Al matrices containing SCS fibers.

Guo, Z.X.; Derby, B. (Univ. of Oxford (United Kingdom). Dept. of Materials)

1994-01-01T23:59:59.000Z

355

Chirped-Pulse Amplification with flashlamp-pumped Ti:Sapphire amplifiers  

Science Conference Proceedings (OSTI)

Ti:Sapphire (Ti:Al{sub 2}O{sub 3}) amplifier stages are typically pumped with Q-switched Nd:YAG lasers doubled to 532 nm because of good spectral overlap, short temporal width, high repetition rate (i.e., 10 Hz to > 5 kHz) and the problems associated with flashlamp pumping a material with a relatively short upper state lifetime. Limitations to this pumping method arise due to the 1 to 1.5 joule/pulse ceiling found in most commercial high rep rate Nd:YAG lasers. The availability of high quality, large aperture Ti:Sapphire rods has made the flashlamp-pumping scheme an attractive option. The excellent thermal properties of Ti:Sapphire also allows an amplifier to be operated at high repetition rates. The front end of our laser relies on Chirped Pulse Amplification (CPA) in laser pumped Ti:Sapphire to generate 55 NJ, 90 fsec pulses at a 10 Hz rate. We report the use of a flashlamp pumped Ti:Sapphire head to further amplify the output of our system, producing 90 fsec, 250 NJ pulses at 5 Hz. The excellent output spatial profile yields a near diffraction-limited 5 {mu}m spot size and peak irradiance in excess of 5 {times} 10{sup 18} W/cm{sup 2}.

Bonlie, J.D.; White, W.E.; Price, D.F.; Reitze, D.H.

1994-01-01T23:59:59.000Z

356

Lithium insertion into hollandite-type TiO{sub 2}.  

DOE Green Energy (OSTI)

Hollandite-type TiO{sub 2} compounds, isostructural with {alpha}-MnO{sub 2}, have been investigated as insertion electrodes for lithium batteries. Parent materials of K{sub x}Ti{sub 8}O{sub 16} (0 < x < 2) were treated with concentrated acid to yield TiO{sub 2} products that were essentially free of potassium. Lithium can be inserted into the (2 x 2) tunnels of the TiO{sub 2} structure chemically (with n-butyllithium) and electrochemically to an approximate composition Li{sub 0.5}TiO{sub 2}. The lithium ions can be easily removed from the lithiated structure by chemical reaction with bromine; cyclic voltammetry indicates that high voltages are required to remove the lithium by electrochemical methods. The poor electrochemical behavior of hollandite-TiO{sub 2} contrasts strongly with {alpha}-MnO{sub 2} electrodes. The superior properties of {alpha}-MnO{sub 2} electrodes are attributed to the presence of oxygen ions, either as H{sub 2}O or Li{sub 2}O, in the (2 x 2) channels; lithia-stabilized electrodes, 0.15Li{sub 2}O {center_dot} -MnO{sub 2}, show good cycling behavior and a rechargeable capacity of approximately 180 mAh/g.

Noailles, L. D.

1998-09-02T23:59:59.000Z

357

Structural Environment of Nitrogen in N-doped Rutile TiO2(110)  

DOE Green Energy (OSTI)

We employ x-ray photoelectron spectroscopy (XPS), reflection high-energy electron diffraction (RHEED) and nuclear reaction analysis (NRA) to characterize the concentration-dependent structural properties of nitrogen doping into rutile TiO2. High quality N-doped TiO2 were prepared on rutile single crystal TiO2(110) substrates using plasma-assisted molecular beam epitaxy with an electron cyclotron resonance (ECR) plasma and Ti effusive sources. Films with N dopant concentrations at or below 2 at.% exhibited predominately substitutional doping based on NRA data, whereas films with concentrations above this limit resulted in little or no substitutional N and surfaces rich in Ti3+. The binding energy of the N 1s feature in XPS did not readily distinguish between these two extremes in N-doping, rendering features within 0.4 eV of each other and similar peak profiles. Although widely used to characterize the state of N in anion-doped TiO2 materials, we find that XPS is unsuitable for this task.

Henderson, Michael A.; Shutthanandan, V.; Ohsawa, Takeo; Chambers, Scott A.

2010-12-31T23:59:59.000Z

358

Enhancement of solar photocatalytic detoxification by adsorption of porphyrins onto TiO sub 2  

DOE Green Energy (OSTI)

Titanium dioxide (TiO{sub 2}) is a photocatalyst for solar detoxification of water containing organic contaminants such as solvents, PCB's, dioxins, pesticides, and dyes. Unfortunately, the ultraviolet (UV) energy used by TiO{sub 2} ({lambda}<400 nm) only comprises about 4% of the solar spectrum. One way of enhancing the efficiency of solar detoxification technologies is to utilize a larger portion of the solar spectrum to initiate the Tio{sub 2}- catalyzed detoxification chemistry. Metalloporphyrins strongly absorb visible and near infrared radiation. By utilization of a process called photosensitization, adsorption of these dyes onto TiO{sub 2} can enable a much broader portion of the solar spectrum to be used. Photosensitization relies upon the ability of the dye molecule to absorb more of the solar energy than bare TiO{sub 2} and to interact electronically with the TiO{sub 2} surface in such a way as to initiate TiO{sub 2}-based redox photochemistry using the dye-absorbed energy. 16 refs., 7 figs.

Majumder, S.A.; Ondrias, M.R. (New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemistry); Prairie, M.R. (Sandia National Labs., Albuquerque, NM (United States)); Shelnutt, J.A. (New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemistry Sandia National Labs., Albuquerque, NM (United States))

1991-01-01T23:59:59.000Z

359

Aspects of nitrogen surface chemistry relevant to TiN chemical vapor deposition  

Science Conference Proceedings (OSTI)

NH{sub 3} is an important component of many chemical vapor deposition (CVD) processes for TiN films, which are used for diffusion barriers and other applications in microelectronic circuits. In this study, the interaction of NH{sub 3} with TiN surfaces is examined with temperature programmed desorption (TPD) and Auger electron spectroscopy. NH{sub 3} has two adsorption states on TiN: a chemisorbed state and a multilayer state. A new method for analyzing TPD spectra in systems with slow pumping speeds yields activation energies for desorption for the two states of 24 kcal/mol and 7.3 kcal/mol, respectively. The sticking probability into the chemisorption state is {approximately}0.06. These results are discussed in the context of TiN CVD. In addition, the high temperature stability of TiN is investigated. TiN decomposes to its elements only after heating to 1300 K, showing that decomposition is unlikely to occur under CVD conditions.

Schulberg, M.T.; Allendorf, M.D.; Outka, D.A.

1996-08-01T23:59:59.000Z

360

Study of surface fluorination of photocatalytic TiO{sub 2} by thermal shock method  

Science Conference Proceedings (OSTI)

Surface fluorinated TiO{sub 2} powders were prepared by thermal shock method and an overall comparative study was achieved on the basis of XRD, SEM, UV-vis and XPS analyses. The main objective was to elucidate the influences of surface fluorination on the crystallite structures, morphologies, optical properties and surface chemistry with the temperature. According to the results, the surface fluorination under thermal shock method below 600 Degree-Sign C did not change the crystallite structure and the particles size, but successfully created chemisorbed fluoride ions, oxygen vacancies and increased the hydroxyl groups on the surface of TiO{sub 2}. The presence of oxygen vacancies was assigned to the red shift of TiO{sub 2} optical absorption edge, which was the origin of visible-light-induced photocatalytic activity of these samples. For the thermal shock temperatures over 600 Degree-Sign C, the K{sub 2}Ti{sub 6}O{sub 13}-like phase was formed, resulting from the decrease of surface hydroxyl groups and the blue shift in absorption edge which reduced the photocatalytic activity. - Graphical abstract: The influence of fluorination on the surface of TiO{sub 2} by thermal shock method at several temperatures has been investigated by following the evolution of the F1s spectra obtained by X-ray photoelectron spectroscopy. The blank peaks are assigned to the chemisorbed fluoride ions on the samples surface and the filled peaks to fluorine atoms in oxygenated environment of solid solution TiO{sub 2-x}F{sub x}, which is originated from the substitution of F ions for O ions in the TiO{sub 2} lattice. Highlights: Black-Right-Pointing-Pointer Surface fluorination of TiO{sub 2} P25 by thermal shock method. Black-Right-Pointing-Pointer Structure, morphology, surface and photocatalytic properties of fluorinated TiO{sub 2}. Black-Right-Pointing-Pointer Low thermal shock temperatures increase the photocatalytic activity. Black-Right-Pointing-Pointer Fluoride ions chemisorbed on the surface without structure and morphology change. Black-Right-Pointing-Pointer Formation of K{sub 2}Ti{sub 6}O{sub 13} phase at high thermal shock temperatures.

Tien Khoa Le [IPREM/ECP (UMR 5254), University of Pau, Helioparc, 2 av. Pierre Angot, 64053 Pau cedex 9 (France); University of Science - Ho Chi Minh city, 227 Nguyen Van Cu Street, Ho Chi Minh City (Viet Nam); Flahaut, Delphine, E-mail: delphine.flahaut@univ-pau.fr [IPREM/ECP (UMR 5254), University of Pau, Helioparc, 2 av. Pierre Angot, 64053 Pau cedex 9 (France); Foix, Dominique; Blanc, Sylvie [IPREM/ECP (UMR 5254), University of Pau, Helioparc, 2 av. Pierre Angot, 64053 Pau cedex 9 (France); Huu Khanh Hung Nguyen; Thi Kieu Xuan Huynh [University of Science - Ho Chi Minh city, 227 Nguyen Van Cu Street, Ho Chi Minh City (Viet Nam); Martinez, Herve [IPREM/ECP (UMR 5254), University of Pau, Helioparc, 2 av. Pierre Angot, 64053 Pau cedex 9 (France)

2012-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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.


361

Metallic glass alloys of Zr, Ti, Cu and Ni  

DOE Patents (OSTI)

At least quaternary alloys form metallic glass upon cooling below the glass transition temperature at a rate less than 10.sup.3 K/s. Such alloys comprise titanium from 19 to 41 atomic percent, an early transition metal (ETM) from 4 to 21 atomic percent and copper plus a late transition metal (LTM) from 49 to 64 atomic percent. The ETM comprises zirconium and/or hafnium. The LTM comprises cobalt and/or nickel. The composition is further constrained such that the product of the copper plus LTM times the atomic proportion of LTM relative to the copper is from 2 to 14. The atomic percentage of ETM is less than 10 when the atomic percentage of titanium is as high as 41, and may be as large as 21 when the atomic percentage of titanium is as low as 24. Furthermore, when the total of copper and LTM are low, the amount of LTM present must be further limited. Another group of glass forming alloys has the formula (ETM.sub.1-x Ti.sub.x).sub.a Cu.sub.b (Ni.sub.1-y Co.sub.y).sub.c wherein x is from 0.1 to 0.3, y.cndot.c is from 0 to 18, a is from 47 to 67, b is from 8 to 42, and c is from 4 to 37. This definition of the alloys has additional constraints on the range of copper content, b.

Lin, Xianghong (Pasadena, CA); Peker, Atakan (Pasadena, CA); Johnson, William L. (Pasadena, CA)

1997-01-01T23:59:59.000Z

362

Preparation and extrusion of multifilamentary NbTi conductor billets  

SciTech Connect

In a cooperative program with industrial superconducting wire manufacturers for the purpose of studying billet preparation and extrusion, a total of twenty billets were assembled. Fourteen of these contained no superconductor but were ''dummy'' billets to evaluate methods of stacking to achieve the best packing density. These billets were not extruded but were sectioned transversely and longitudinally for evaluation of billet preparation techniques. The remaining six billets were assembled with NbTi stacking elements in a copper/copper nickel matrix using a standard conductor configuration. Two of these billets were instrumented with thermocouples and used to evaluate preheating techniques. The other four were extruded and drawn to finished conductor size for critical current measurement. This study showed that hexagonal stacking elements, contoured billet jackets and hot isostatic pressing resulted in high density uniform billets for extrusion. Rotary forging was found to be unacceptable for billet compacting. Fast billet heating was achieved in both the salt bath and by induction heating, but the induction method gave a more uniform temperature distribution during the heating cycle. Asymmetry from poor packing density in the billet resulted in nonuniform filament size distributions and poor critical current performance. Billet yield was increased as much as 16 percent by contouring the stacking element positions within the billet. (auth)

Fietz, W.A.; McDonald, R.E.; Miller, J.R.

1975-01-01T23:59:59.000Z

363

Incidence of neoplasms in ages 0-19 Y in parts of Sweden with high {sup 137}Cs fallout after the Chernobyl accident  

SciTech Connect

The incidence of neoplasms in childhood and adolescence in northern and central Sweden before and after the radioactive fallout from the Chernobyl accident was investigated in an ecologic study, 1978 to 1992. The study included all parishes in the six most contaminated counties classified after aerial mapping of ground radiation form {sup 137}Cs and investigated 746 cases of neoplasms in ages 0-19 y, diagnosed in the six counties. Incidence and relative risks of neoplasms were compared in areas with high, intermediate, and low contamination after versus before the Chernobyl accident in 1986. A continuous increase of brain tumor incidence in the ages 0-19 y during the period 1978-92 without clear relationship to the Chernobyl fallout was discovered. No clear relationship between the incidence of brain tumor and the exposure to varying levels of radiation from {sup 137}Cs was apparent. A some-what decreased relative risk of acute lymphatic leukemia appeared in areas with increased exposure. Other neoplasms showed no changes in incidence over time or with regard to exposure. Until now, there is no indication that the Chernobyl accident has affected the incidence of childhood and adolescence neoplasms in Sweden, but it is still too early for any final conclusion about the effect of this event. 12 refs., 1 fig., 2 tabs.

Tondel, M.; Flodin, U.; Skoeldestig, A.; Axelson, O. [Univ. Hospital, Linkoeping (Sweden)] [and others

1996-12-01T23:59:59.000Z

364

Characterization of the LiSi/CsBr-LiBr-KBr/FeS(2) System for Potential Use as a Geothermal Borehole Power Source  

DOE Green Energy (OSTI)

We are continuing to study the suitability of modified thermal-battery technology as a potential power source for geothermal borehole applications. Previous work focused on the LiSi/FeS{sub 2} couple over a temperature range of 350 C to 400 C with the LiBr-KBr-LiF eutectic, which melts at 324.5 C. In this work, the discharge processes that take place in LiSi/CsBr-LiBr-KBr eutectic/FeS{sub 2} thermal cells were studied at temperatures between 250 C and 400 C using pelletized cells with immobilized electrolyte. The CsBr-LiBr-KBr eutectic was selected because of its lower melting point (228.5 C). Incorporation of a quasi-reference electrode allowed the determination of the relative contribution of each electrode to the overall cell polarization. The results of single-cell tests and limited battery tests are presented, along with preliminary data for battery stacks tested in a simulated geothermal borehole environment.

GUIDOTTI, RONALD A.; REINHARDT, FREDERICK W.

1999-10-18T23:59:59.000Z

365

Structure of epitaxial (Fe,N) codoped rutile TiO2 thin films by x-ray absorption  

Science Conference Proceedings (OSTI)

Homoepitaxial thin films of Fe:TiO2 and (Fe,N):TiO2 were deposited on rutile(110) by molecular beam epitaxy. X-ray absorption near edge spectroscopy (XANES) spectra were collected at the Ti L-edge, Fe L-edge, O K-edge, N K-edge, and Ti K-edge. No evidence of structural disorder associated with a high concentration of oxygen vacancies is observed. Substitution of Fe for Ti could not be confirmed, although secondary phase Fe2O3 and metallic Fe can be ruled out. The similarity of the N K-edge spectra to O, and the presence of a strong x-ray linear dichroism (XLD) signal for the N K-edge, indicates that N is substitutional for O in the rutile lattice, and is not present as a secondary phase such as TiN. Simulations of the XANES spectra qualitatively confirm substitution, although N appears to be present in more than one local environment. Neither Fe:TiO2 nor (Fe,N):TiO2 exhibit intrinsic room temperature ferromagnetism, despite the presence of mixed valence Fe(II)/Fe(III) in the reduced (Fe,N):TiO2 film.

Kaspar, Tiffany C.; Ney, A.; Mangham, Andrew N.; Heald, Steve M.; Joly, Yves; Ney, V.; Wilhelm, F.; Rogalev, A.; Yakou, Flora; Chambers, Scott A.

2012-07-23T23:59:59.000Z

366

Visible Light Absorption of Binuclear TiOCoII Charge-Transfer UnitAssembled in Mesoporous Silica  

SciTech Connect

Grafting of CoII(NCCH3)2Cl2 onto mesoporous Ti-MCM-41 silicain acetonitrile solution affords binuclear Ti-O-CoII sites on the poresurface under complete replacement of the precursor ligands byinteractions with anchored Ti centers and the silica surface. The CoIIligand field spectrum signals that the Co centers are anchored on thepore surface in tetrahedral coordination. FT-infrared action spectroscopyusing ammonia gas adsorption reveals Co-O-Si bond modes at 831 and 762cm-1. No Co oxide clusters are observed in the as-synthesized material.The bimetallic moieties feature an absorption extending from the UV intothe visible to about 600 nm which is attributed to the TiIV-O-CoII?3TiIII-O-CoIII metal-to-metal charge-transfer (MMCT) transition. Thechromophore is absent in MCM-41 containing Ti and Co centers isolatedfrom each other; this material was synthesized by grafting CoII onto aTi-MCM-41 sample with the Ti centers protected by a cyclopentadienylligand. The result indicates that the appearance of the charge-transferabsorption requires that the metal centers are linked by an oxo bridge,which is additionally supported by XANES spectroscopy. The MMCTchromophore of Ti-O-CoII units has sufficient oxidation power to serve asvisible light electron pump for driving multi-electron transfer catalystsof demanding uphill reactions such as water oxidation.

Han, Hongxian; Frei, Heinz

2007-01-30T23:59:59.000Z

367

Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS:  

NLE Websites -- All DOE Office Websites (Extended Search)

Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: products, effect of UV irradiation, water and coadsorbed K+ Title Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: products, effect of UV irradiation, water and coadsorbed K+ Publication Type Journal Article Year of Publication 2013 Authors Rosseler, Olivier, Mohamad Sleiman, Nahuel V. Montesinos, Andrey Shavorskiy, Valerie Keller, Nicolas Keller, Marta I. Litter, Hendrik Bluhm, Miquel Salmeron, and Hugo Destaillats Journal J. Phys. Chem. Lett. Volume 4 Start Page 536 Issue 3 Pagination 536-541 Date Published 01/2013 Abstract Self-cleaning surfaces containing TiO2 nanoparticles have been postulated to efficiently remove NOx from the atmosphere. However, UV irradiation of NOx adsorbed on TiO2 also was shown to form harmful gas-phase byproducts such as HONO and N2O that may limit their depolluting potential. Ambient pressure XPS was used to study surface and gas-phase species formed during adsorption of NO2 on TiO2 and subsequent UV irradiation at λ = 365 nm. It is shown here that NO3-, adsorbed on TiO2 as a byproduct of NO2 disproportionation, was quantitatively converted to surface NO2 and other reduced nitrogenated species under UV irradiation in the absence of moisture. When water vapor was present, a faster NO3- conversion occurred, leading to a net loss of surface-bound nitrogenated species. Strongly adsorbed NO3- in the vicinity of coadsorbed K+ cations was stable under UV light, leading to an efficient capture of nitrogenated compounds.

368

XAFS Study of Epitaxial CoxTi1-xO?-x Anatase  

SciTech Connect

Co doped TiO?-anatase is a promising candidate for a room-temperature ferromagnetic semiconductor. XAFS measurements have been used to investigate the local Co environment and Co valence for several Co-anatase films. The samples were grown on LaAlO?(001) by oxygen plasma assisted molecular beam epitaxy and on SrTiO? by atomic oxygen assisted MBE. Co concentrations were about 5%. The measurements were made at the PNC-CAT bending magnet and undulator beamlines at the Advanced Photon Source. For the films on LaAlO?, the near edge clearly shows the presence of only Co(??), and no evidence for metallic Co, while the films on SrTiO? showed significant metallic Co. Analysis of the extended fine structure for the LaAlO? films finds that the Co substitutes for Ti with some distortion of the lattice. Both in-plane and out-of-plane Co-O bonds are expanded from the Ti-O bonds in anatase. The in-plane bonds are expanded approximately twice as much. A deficit in the oxygen coordination number suggests a correlation of oxygen vacancies with Co sites.

Heald, Steve M.; Chambers, Scott A.; Droubay, Timothy

2005-01-01T23:59:59.000Z

369

Metallic glass alloys of Zr, Ti, Cu and Ni  

DOE Patents (OSTI)

At least quaternary alloys form metallic glass upon cooling below the glass transition temperature at a rate less than 10{sup 3} K/s. Such alloys comprise titanium from 19 to 41 atomic percent, an early transition metal (ETM) from 4 to 21 atomic percent and copper plus a late transition metal (LTM) from 49 to 64 atomic percent. The ETM comprises zirconium and/or hafnium. The LTM comprises cobalt and/or nickel. The composition is further constrained such that the product of the copper plus LTM times the atomic proportion of LTM relative to the copper is from 2 to 14. The atomic percentage of ETM is less than 10 when the atomic percentage of titanium is as high as 41, and may be as large as 21 when the atomic percentage of titanium is as low as 24. Furthermore, when the total of copper and LTM are low, the amount of LTM present must be further limited. Another group of glass forming alloys has the formula (ETM{sub 1{minus}x}Ti{sub x}){sub a} Cu{sub b} (Ni{sub 1{minus}y}Co{sub y}){sub c} wherein x is from 0.1 to 0.3, y{center_dot}c is from 0 to 18, a is from 47 to 67, b is from 8 to 42, and c is from 4 to 37. This definition of the alloys has additional constraints on the range of copper content, b. 2 figs.

Lin, X.; Peker, A.; Johnson, W.L.

1997-04-08T23:59:59.000Z

370

The correlation of the electrical properties with electron irradiation and constant voltage stress for MIS devices based on high-k double layer (HfTiSiO: N and HfTiO:N) dielectrics  

Science Conference Proceedings (OSTI)

This paper describes the influence of e-beam irradiation and constant voltage stress on the electrical characteristics of metal-insulator-semiconductor structures, with double layer high-k dielectric stacks containing HfTiSiO:N and HfTiO:N ultra-thin ... Keywords: Electrical properties, High-k dielectrics, Metal-insulator-semiconductor (MIS) devices

V. Mikhelashvili; P. Thangadurai; W. D. Kaplan; G. Eisenstein

2010-11-01T23:59:59.000Z

371

XRD and NMR investigation of Ti-compound formation in solution-doping of sodium aluminum hydrides: Solubility of Ti in NaAlH4 crystals grown in THF  

DOE Green Energy (OSTI)

Sodium aluminum hydrides have gained attention due to their high hydrogen weight percent (5.5% ideal) compared to interstitial hydrides, and as a model for hydrides with even higher hydrogen weight fraction. The purpose of this paper is to investigate the Ti-compounds that are formed under solution-doping techniques, such as wet doping in solvents such as tetrahydrofuran (THF). Compound formation in Ti-doped sodium aluminum hydrides is investigated using x-ray diffraction (XRD) and magic angle spinning (MAS) nuclear magnetic resonance (NMR). We present lattice parameter measurements of crushed single crystals, which were exposed to Ti during growth. Rietveld refinements indicate no lattice parameter change and thus no solubility for Ti in NaAlH{sub 4} by this method of exposure. In addition, x-ray diffraction data indicate that no Ti substitutes in NaH, the final decomposition product for the alanate. Reaction products of completely reacted (33.3 at. %-doped) samples that were solvent-mixed or mechanically milled are investigated. Formation of TiAl{sub 3} is observed in mechanically milled materials, but not solution mixed samples, where bonding to THF likely stabilizes Ti-based nano-clusters. The Ti in these clusters is activated by mechanical milling.

Majzoub, E H; Herberg, J L; Stumpf, R; Spangler, S; Maxwell, R S

2004-08-26T23:59:59.000Z

372

Electrochemical characterization of Li4Ti5O12/C anode material prepared by starch-sol-assisted rheological phase method for Li-ion battery  

Science Conference Proceedings (OSTI)

Li4Ti5O12/C composite was synthesized by starch-sol-assisted rheological phase method using inexpensive raw material starch as carbon coating precursor. The Li4Ti5O12/C powder was characterized ...

Zhenpo Wang, Guowei Xie, Lijun Gao

2012-01-01T23:59:59.000Z

373

PHOTOVOLTAIC PROPERTIES OF AU-MEROCYANINE-TiO2 SANDWICH CELLS. II. PROPERTIES OF ILLUMINATED CELLS AND EFFECTS OF DOPING WITH ELECTRON ACCEPTORS  

E-Print Network (OSTI)

the photovoltaic efficiencies of a sandwich cell made byPHOTOVOLTAIC PROPERTIES OF AU-MEROCYANINE-TiO SANDWICH CELLSPhotovoltaic Properties of Au-Merocyanine-Ti0 2 Sandwich Cells

Skotheim, T.

2010-01-01T23:59:59.000Z

374

Direct Application of TiBor Coatings Projects (4583), 3/12/2012  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Direct Application of Ti8or Coatings Projects (4583) Direct Application of Ti8or Coatings Projects (4583) Program or Field Office: Y-12 Site Office Location(s) (City/County/State): Oak Ridge, Anderson County, Tennessee Proposed Action Description: Submit by E-mail The scope of this Cooperative Research and Development (CRADA) is to demonstrate the performance of Ti8or coatings on steel tools, specifically farming tools such as plows, which are normally subjected to significant wear during springtime use. Categorical Exclusion(s) Applied: 83.6 - Small-scale research and development, laboratory operations, and pilot projects 83.11 - Outdoor tests and experiments on materials and equipment components For the complete DOE National Environmental Policy Act regulations regarding categorical exclusions, including the full text of each

375

Optical properties of TiN thin films close to the superconductor-insulator transition.  

Science Conference Proceedings (OSTI)

We present the intrinsic optical properties over a broad spectral range of TiN thin films deposited on an Si/SiO{sub 2} substrate. We analyze the measured reflectivity spectra of the film-substrate multilayer structure within a well-establish procedure based on the Fresnel equation and extract the real part of the optical conductivity of TiN. We identify the metallic contribution as well as the finite energy excitations and disentangle the spectral weight distribution among them. The absorption spectrum of TiN bears some similarities with the electrodynamic response observed in the normal state of the high-temperature superconductors. Particularly, a mid-infrared feature in the optical conductivity is quite reminiscent of a pseudogap-like excitation.

Pfuner, F.; Degiorgi, L.; Baturina, T. I.; Vinokur, V. M.; Baklanov, M. R.; Materials Science Division; ETH Zurich; Inst. Semiconductor Physics; IMEC Kapeldreef

2009-11-10T23:59:59.000Z

376

Photoluminescence in disordered Zn{sub 2}TiO{sub 4}  

SciTech Connect

In this work, the polymeric precursor method was used to obtain disordered Zn{sub 2}TiO{sub 4} powders, either undoped or doped with Sn{sup 4+}, Cr{sup 3+} and V{sup 5+}, to be applied as photoluminescent material. The characterization was undertaken by means of thermal analysis (TG and DTA), X-ray diffraction (XRD), infrared spectroscopy (IR) and photoluminescence (PL). Previous works stated that titanate octahedra containing a short Ti-O distance show efficient luminescence at room temperature if these octahedra are isolated from each other. In the present work, the phenomenon was observed in condensed octahedra, sharing edges. The room temperature PL noticed in undoped Zn{sub 2}TiO{sub 4} had its intensity increased by the dopant addition-the increase was of about 300% for V{sup 5+} doping, 400% for Cr{sup 3+} and 800% for Sn{sup 4+}.

Chaves, Alexsandra C. [LTM, Departamento de Quimica, CCEN, Universidade Federal da Paraiba, 58059-900, Joao Pessoa, PB (Brazil); Lima, Severino J.G. [LSR, Departamento de Tecnologia Mecanica, CT, Universidade Federal da Paraiba, 58059-900, Joao Pessoa, PB (Brazil); Araujo, Regiane C.M.U. [LTM, Departamento de Quimica, CCEN, Universidade Federal da Paraiba, 58059-900, Joao Pessoa, PB (Brazil); Maurera, Maria Aldeiza M.A. [LTM, Departamento de Quimica, CCEN, Universidade Federal da Paraiba, 58059-900, Joao Pessoa, PB (Brazil); Longo, Elson [CMDMC, Instituto de Quimica de Araraquara, UNESP, 14800-900, Araraquara, SP (Brazil); Pizani, Paulo S. [Departamento de Fisica, Universidade Federal de Sao Carlos, Caixa Posta 676, 13565-905, Sao Carlos, SP (Brazil); Simoes, Luiz G.P. [CMDMC, Instituto de Quimica de Araraquara, UNESP, 14800-900, Araraquara, SP (Brazil); Soledade, Luiz E.B. [LTM, Departamento de Quimica, CCEN, Universidade Federal da Paraiba, 58059-900, Joao Pessoa, PB (Brazil); Souza, Antonio G. [LTM, Departamento de Quimica, CCEN, Universidade Federal da Paraiba, 58059-900, Joao Pessoa, PB (Brazil); Santos, Ieda Maria Garcia dos [LTM, Departamento de Quimica, CCEN, Universidade Federal da Paraiba, 58059-900, Joao Pessoa, PB (Brazil)]. E-mail: ieda@quimica.ufpb.br

2006-04-15T23:59:59.000Z

377

Atom-probe field-ion-microscopy study of Fe-Ti alloys  

DOE Green Energy (OSTI)

A newly developed high-performance atom-probe (field ion microscope) was employed for the composition analysis of Fe-Ti alloys and their interactions with ambient gas, such as H/sub 2/ and O/sub 2/. With a mass resolution (m/..delta..m) better than 2000 and a spatial resolution of a few A, all isotopes of Fe and Ti and their hydrides and other compounds are clearly resolved during the depth profile study. Some of our findings are: (1) Titanium segregated on the surface and grain boundaries upon heating (greater than or equal to 900/sup 0/C), in the form of oxides, and (2) some Ti in the bulk forms clusters of various sizes with C, O, and/or N as nuclei.

Pickering, H.W.; Kuk, Y.; Sakurai, T.

1980-01-01T23:59:59.000Z

378

Eutectic bonding of a Ti sputter coated, carbon aerogel wafer to a Ni foil  

Science Conference Proceedings (OSTI)

The formation of high energy density, storage devices is achievable using composite material systems. Alternate layering of carbon aerogel wafers and Ni foils with rnicroporous separators is a prospective composite for capacitor applications. An inherent problem exists to form a physical bond between Ni and the porous carbon wafer. The bonding process must be limited to temperatures less than 1000{degrees}C, at which point the aerogel begins to degrade. The advantage of a low temperature eutectic in the Ni-Ti alloy system solves this problem. Ti, a carbide former, is readily adherent as a sputter deposited thin film onto the carbon wafer. A vacuum bonding process is then used to join the Ni foil and Ti coating through eutectic phase formation. The parameters required for successfld bonding are described along with a structural characterization of the Ni foil-carbon aerogel wafer interface.

Jankowski, A.F.; Hayes, J.P.; Kanna, R.L.

1994-06-01T23:59:59.000Z

379

Molecular beam epitaxy of SrTiO{sub 3} with a growth window  

Science Conference Proceedings (OSTI)

Many complex oxides with only nonvolatile constituents do not have a wide growth window in conventional molecular beam epitaxy (MBE) approaches, which makes it difficult to obtain stoichiometric films. Here it is shown that a growth window in which the stoichiometry is self-regulating can be achieved for SrTiO{sub 3} films by using a hybrid MBE approach that uses a volatile metal-organic source for Ti, titanium tetra isopropoxide (TTIP). The growth window widens and shifts to higher TTIP/Sr flux ratios with increasing temperature, showing that it is related to the desorption of the volatile TTIP. We demonstrate stoichiometric, highly perfect, insulating SrTiO{sub 3} films. The approach can be adapted for the growth of other complex oxides that previously were believed to have no wide MBE growth window.

Jalan, Bharat; Moetakef, Pouya; Stemmer, Susanne [Materials Department, University of California, Santa Barbara, California 93106-5050 (United States)

2009-07-20T23:59:59.000Z

380

www.elsevier.com/locate/jssc Photoluminescence in disordered Zn 2TiO 4  

E-Print Network (OSTI)

In this work, the polymeric precursor method was used to obtain disordered Zn2TiO4 powders, either undoped or doped with Sn 4+, Cr 3+ and V 5+, to be applied as photoluminescent material. The characterization was undertaken by means of thermal analysis (TG and DTA), X-ray diffraction (XRD), infrared spectroscopy (IR) and photoluminescence (PL). Previous works stated that titanate octahedra containing a short Ti–O distance show efficient luminescence at room temperature if these octahedra are isolated from each other. In the present work, the phenomenon was observed in condensed octahedra, sharing edges. The room temperature PL noticed in undoped Zn2TiO4 had its intensity increased by the dopant addition—the increase was of about 300 % for V 5+ doping, 400 % for Cr 3+ and 800% for Sn 4+.

Ra C. Chaves A; Severino J. G. Lima B; Maria Aldeiza; M. A. Maurera A; Elson Longo C; Paulo S. Pizani D; Luiz G. P. Simo˜es C; Luiz E. B. Soledade A; Antonio G. Souza A; Ieda Maria; Garcia Santos

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" from the National Library of EnergyBeta (NLEBeta).
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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.


381

Annealing effect on photovoltaic performance of CdSe quantum-dots-sensitized TiO2 nanorod solar cells  

Science Conference Proceedings (OSTI)

Large area rutile TiO2 nanorod arrays were grown on F:SnO2 (FTO) conductive glass using a hydrothermal method at low temperature. CdSe quantum dots (QDs) were deposited onto single-crystalline TiO2 nanorod arrays by a ...

Yitan Li, Lin Wei, Ruizi Zhang, Yanxue Chen, Jun Jiao

2012-01-01T23:59:59.000Z

382

First-principles study of hydrogen storage on Ti-decorated B{sub 2}C sheet  

Science Conference Proceedings (OSTI)

The hydrogen storage capacity of Ti decorated B{sub 2}C sheet has been investigated by first-principles plane-wave calculation. It is revealed that a single Ti atom adsorbed on the B{sub 2}C sheet can strongly bind up to four hydrogen molecules. The adsorption energy is in the range of -0.36--0.82 eV/H{sub 2}, which is suitable for ambient temperature hydrogen storage. Considering the fact that Ti can be loaded on both sides of B{sub 2}C sheet, corresponding gravimetric storage capacity of Ti/B{sub 2}C system was also calculated and it can reach to about 7.0 wt%, exceeding the minimum requirement of 6.0 wt% for applications. - Graphical abstract: We investigated the hydrogen storage capacity of Ti decorated B{sub 2}C sheet. The most favorable adsorption geometries for every number of hydrogen molecules on Ti/B{sub 2}C complex are given in the figure. Highlights: Black-Right-Pointing-Pointer Ti decorated B{sub 2}C sheet serve as hydrogen storage medium. Black-Right-Pointing-Pointer A single Ti atom adsorbed on the B{sub 2}C sheet can strongly bind up to four hydrogen molecules. Black-Right-Pointing-Pointer The adsorption energy is in moderate range of -0.36--0.82 eV/H{sub 2}.

Guo, Y.H.; Xu, B.; Xia, Y.D.; Yin, J. [Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China); Liu, Z.G., E-mail: liuzg@nju.edu.cn [Department of Materials Science and Engineering and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 (China)

2012-06-15T23:59:59.000Z

383

Investigation of the Ti/MgCl{sub 2} interface on a Si(111) 7 x 7 substrate  

Science Conference Proceedings (OSTI)

Photoelectron spectroscopy with synchrotron radiation, low energy electron diffraction, and ion-scattering spectroscopy were used in order to study the Ti/MgCl{sub 2} interface grown on an atomically clean Si(111) 7 x 7 substrate. A series of high resolution spectra after deposition of a thick MgCl{sub 2} layer, step by step deposition of Ti and gradual annealing, indicated a very reactive interface even at room temperature. Strong interaction between the incoming Ti atoms and the MgCl{sub 2} layer, leads to the formation of Ti{sup 2+} and Ti{sup 4+} oxidation states. The interfacial interaction continues even at multilayer Ti coverage mainly by the partial disruption of Mg-Cl bonds and the formation of Ti-Cl sites, rendering this interface a very promising UHV-compatible model of a pre-catalyst for olefin polymerization. After the final annealing, the MgCl{sub 2} multilayers desorb while Ti remains on the surface forming a silicide layer on which Cl and Mg atoms are attached.

Karakalos, S.; Siokou, A. [FORTH/ICE-HT, P.O. Box 1414, GR-26504 Rion, Patras (Greece); Skala, T.; Matolin, V. [Charles University, Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holesovickach 2, 18000 Prague 8 (Czech Republic); Plekan, O. [Sincrotrone Trieste, AREA Science Park, I-34012 Basovizza (Italy); Ladas, S. [FORTH/ICE-HT, P.O. Box 1414, GR-26504 Rion, Patras (Greece); Surface Science Laboratory, Department of Chemical Engineering, University of Patras, GR-26504, Rion, Patras (Greece); Prince, K. [Sincrotrone Trieste, AREA Science Park, I-34012 Basovizza (Italy); INFM, Laboratorio TASC, in Area Science Park, Strada Statale 14, Km 163.5, 34012 Basovizza-Trieste (Italy); Chab, V. [Institute of Physics, Chech Academy of Sciences, Cucrovarnicka 10, Prague (Czech Republic)

2012-06-14T23:59:59.000Z

384

Interpretation of ES, CS, and IOS approximations within a translational-internal coupling scheme. II. Application to atom--diatom kinetic cross sections  

SciTech Connect

ES, CS, and IOS approximations to atom--diatom kinetic cross sections are derived. In doing so, reduced S-matrices in a translational-internal coupling scheme are stressed. This entails the insertion of recently obtained approximate reduced S-matrices in the translational-internal coupling scheme into previously derived general expressions for the kinetic cross sections. Of special interest is the structure (rotational j quantum number dependence) of the kinetic cross sections associated with the Senftleben Beenakker effects and of pure internal state relaxation phenomena. The viscomagnetic effect is used as an illustrative example. It is found in particular that there is a great similarity of structure between the energy sudden (and IOS) approximation and the previously derived distorted wave Born results.

Coombe, D.A.; Snider, R.F.

1980-02-15T23:59:59.000Z

385

No evidence for in vivo induction of genomic instability in bone marrow cells collected from mice exposed to low-dose 137Cs γ rays:  

NLE Websites -- All DOE Office Websites (Extended Search)

Rithidech et al, 2006 1 Rithidech et al, 2006 1 No evidence for in vivo induction of genomic instability in bone marrow cells collected from mice exposed to low-dose 137 Cs γ rays: Kanokporn Noy Rithidech 1 , Chatchanok Loetchutinat 1 , Louise Honikel 1 , and Elbert B. Whorton 2 1 Pathology Department, Stony Brook University, Stony Brook, NY 11794-8691 2 Molecular Epidemiology Research Program, University of Texas Medical Branch at Galveston, TX 77555-1153 Assessment of potential health risks associated with exposure to low-dose radiation (at doses below or equal to 0.1 Gy) is still a challenging public health issue. It is therefore important to improve our understanding of potential induction of genomic instability in vivo by this low-dose range because it has been widely suggested that elevation of genomic instability also elevates cancer

386

Clusters and Magnetism in Epitaxial Co-doped TiO? Anatase.  

SciTech Connect

We show that under certain conditions, highly Co-enriched Ti0? anatase clusters nucleate on epitaxial Ti0? anatase grown on LaA?O?(001) by oxygen plasma assisted molecular beam epitaxy. In the most extreme cases, virtually all incident Co segregates to the clusters, yielding a nanoscale ferromagnitic phase that is not ferromagnetic in homogeneous films of the same Co concentration. The nucleation of this phase simultaneous with continuous epitaxial film growth must be carefully monitored in order to avoid drawing false conclusions about the film structure

Chambers, Scott A.; Droubay, Timothy; Wang, Chong M.; Lea, Alan S.; Farrow, R.F.C; Folks, L.; Deline, V.; Anders, S.

2003-02-24T23:59:59.000Z

387

Mixed-sputter deposition of Ni-Ti-Cu shape memory films  

SciTech Connect

Ni-Ti-Cu shape memory films were mixed-sputter deposited from separate nickel, titanium, and copper targets, providing increased compositional flexibility. Shape memory characteristics, examined for films with 7 at. % Cu and 41--51 at. % Tl, were determined with temperature controlled substrate curvature measurements, and microstructure was studied with transmission electron microscopy. The Ni-Ti-Cu films were found to have shape memory properties comparable to bulk materials, with transformation temperatures between 20 and 62{degree}C, a 10--13{degree}C hysteresis, and up to 330 MPa recoverable stress.

Krulevitch, P.; Ramsey, P.B.; Makowiecki, D.M.; Lee, A.P.; Northrup, M.A. [Lawrence Livermore National Lab., CA (United States); Johnson, G.C. [California Univ., Berkeley, CA (United States). Dept. of Mechanical Engineering

1994-05-01T23:59:59.000Z

388

Advances in the Surface Science of TiO2 – A Global Perspective  

SciTech Connect

TiO2 rutile single-crystal surfaces have served has useful prototypical, well-defined specimens for fundamental investigations of oxide surface science for many years. As a result of both experimental and theoretical efforts, we have gained considerable insight into the structural, electronic, thermochemical and photochemical properties of pristine as well as defective surfaces. In this brief review, I summarize some of the recent advances that have been made in the laboratories of participants of the International Workshop of Oxide Surfaces (IWOX) series, principally on TiO2(110).

Chambers, Scott A.

2007-10-10T23:59:59.000Z

389

Characterizations Of Precipitate Phases In a Ti-Ni-Pd Alloy  

Science Conference Proceedings (OSTI)

Precipitates in the Ti46Ni37.5Pd16.5 alloy were investigated by electron diffraction and high-resolution scanning transmission electron microscopy. The phase content and stability were determined at several different temperatures and times. Aging at 400 C for an hour results in a new phase, which is consumed by P-phase at longer aging time. At 450 C, the new phase appears first, and then coexists with P-phase. At 500 C, the entire alloy transformed into the new phase. At 550 C, Ti3(Ni,Pd)4 phase begins to form.

Yang, Fan; Kovarik, Libor; Phillips, Patrick J.; Noebe, Ronald D.; Mills, M. J.

2012-06-01T23:59:59.000Z

390

Photoinduced charge transfer between fullerenes and TiO{sub 2} semiconductor colloids  

Science Conference Proceedings (OSTI)

A photocatalytic method has been presented to carry out one-electron reduction of C{sub 60} and C{sub 70} in 50/50 (v/v) benzene/ethanol. The fullerene reduction was carried out in colloidal TiO{sub 2} suspension using UV excitation. The charge transfer between the excited TiO{sub 2} semiconductor colloid and fullerene molecule occurs with a quantum efficiency of 13% for C{sub 70} and 24% for C{sub 60}. Laser flash photolysis measurements have been carried out to elucidate the mechanism of photocatalytic reduction.

Kamat, P.V. [Univ. of Notre Dame, IN (United States). Radiation Lab.; Bedja, I.; Hotchandani, S. [Universite du Quebec a Trois Rivieres (Canada). Centre de Recherche en Photobiophysique

1994-10-01T23:59:59.000Z

391

Enhancing the Electron Mobility via Delta-Doping in SrTiO3  

Science Conference Proceedings (OSTI)

We fabricated high-mobility {delta}-doped structures in SrTiO{sub 3} thin films in order to investigate the low temperature electronic transport properties of confined carriers in this system. An enhancement of the electron mobility above the bulk value was observed as the doped layer thickness decreased. High-field Hall measurements revealed that this mobility enhancement originates from higher-mobility electrons in the undoped clean regions, which have quantum-mechanically broadened from the doped layer. Because of the absence of apparent lattice misfit between the layers, this structure is highly suitable for investigating two-dimensional electron gases in SrTiO{sub 3}

Kozuka, Y.

2011-08-11T23:59:59.000Z

392

Diffusion bonding of Ti coated Zircaloy-4 and 316-L stainless steel  

SciTech Connect

Diffusion bonding of Zircaloy-4 and Type 316-L stainless steel was carried out by coating the joining surfaces with Ti to minimize the interlayer effect. Bonding heat treatments were carried out in vacuum at 1000 deg. C for 4 h and 1050 deg. C for 1 h. The microstructure of the diffusion zone was investigated by scanning electron microscopy and the phases in the diffusion zone were analyzed by energy dispersive spectroscopy. It is observed that Ti coating at the interface produced a dendritic structure in the diffusion zone formed in the Zircaloy-4. The concentration of the dendrites increases with an increase in bonding temperature.

Akhter, J.I. [Physics Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Islamabad (Pakistan)], E-mail: jiakhter@yahoo.com; Ahmad, M.; Ali, G. [Physics Division, Pakistan Institute of Nuclear Science and Technology, P. O. Nilore, Islamabad (Pakistan)

2009-03-15T23:59:59.000Z

393

Growth mechanism of in situ synthesized TiB{sub w} in titanium matrix composites prepared by common casting technique  

SciTech Connect

Titanium matrix composites reinforced with TiB and RE{sub 2}O{sub 3} (RE = rare earth metal) were fabricated by a non-consumable arc-melting technology utilizing chemical reaction between titanium, B{sub 2}O{sub 3} and RE. Microstructural characterization of in situ synthesized TiB was performed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). When the volume percentage is relatively low, the TiB shows a typical fine needle-shape due to the solidification process. The TiB whiskers have a B27 crystal structure and grow along the B27 [010] direction. Based on Density Functional Theory (DFT), the surface energies of B27 (100), (101), (101-bar ) and (001) planes were calculated. The results show that the cross sections of TiB whiskers are hexagonal and consist of (100), (101), (101-bar ) planes.

Lu, W.J. [State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030 (China)], E-mail: luweijie@sjtu.edu.cn; Xiao, L.; Geng, K.; Qin, J.N.; Zhang, D. [State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030 (China)

2008-07-15T23:59:59.000Z

394

High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity  

DOE Green Energy (OSTI)

There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the heterojunction.

Hwang, Yun Jeong; Boukai, Akram; Yang, Peidong

2008-11-15T23:59:59.000Z

395

Effect of crystallinity and nonstoichiometric region on dielectric properties of SrTiO{sub 3} films formed on Ru  

Science Conference Proceedings (OSTI)

The dielectric constant depending on the film thickness for SrTiO{sub 3} films formed on Ru was investigated after an annealing step at 600 deg. C, which shows that the dielectric constant increased abruptly with the film thickness up to 20 nm and then increased slightly, remaining relatively constant at a value of about 65. The abrupt increase was due to the crystallinity of SrTiO{sub 3} films. On the other hand, the slight increase was related to the existence of nonstoichiometric region near the interface of SrTiO{sub 3} film and Ru, which was intermixed with SrTiO{sub 3} and Ti-O phases having an equivalent oxide thickness over 0.32 nm.

Kim, Ja-Yong; Ahn, Ji-Hoon; Kang, Sang-Won; Kim, Jin-Hyock; Roh, Jae-Sung [Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Hynix Semiconductor Incorporated, San 136-1, Ami-ri, Bubal-eub, Icheon-si, Kyoungki-do 467-701 (Korea, Republic of)

2007-08-27T23:59:59.000Z

396

A reaction mechanism for titanium nitride CVD from TiCl{sub 4} and NH{sub 3}  

Science Conference Proceedings (OSTI)

A gas-phase and surface reaction mechanism for the CVD of TiN from TiCl{sub 4} and NH{sub 3} is proposed. The only gas-phase process is complex formation, which can compete with deposition. The surface mechanism postulates the stepwise elimination of Cl and H atoms from TiCl{sub 4} and NH{sub 3}, respectively, to form solid TiN and gaseous HCl. The mechanism also accounts for the change in oxidation state of Ti by allowing for liberation of N{sub 2}. Provided that the surface composition is at steady state, the stoichiometry of the overall reaction is reproduced exactly. In addition, the global kinetic law predicted by the mechanism is successfully fit to new deposition data from a rotating disk reactor and is shown to be consistent with literature results.

Larson, R.S.; Allendorf, M.D.

1995-12-01T23:59:59.000Z

397

Reaction of U-VI with titanium-substituted magnetite: Influence of Ti on U-IV speciation  

SciTech Connect

Reduction of hexavalent uranium (UVI) to less soluble tetravalent uranium (UIV) through enzymatic or abiotic redox reactions has the potential to alter U mobility in subsurface environments. As a ubiquitous natural mineral, magnetite (Fe3O4) is of interest because of its ability to act as a rechargeable reductant for UVI. Natural magnetites are often impure with titanium, and structural Fe3+ replacement by TiIV yields a proportional increase in the relative Fe2+ content in the metal sublattice to maintain bulk charge neutrality. In the absence of oxidation, the Ti content sets the initial bulk Fe2+/Fe3+ ratio (R). Here, we demonstrate that Ti-doped magnetites (Fe3 xTixO4) reduce UVI to UIV. The UVI-Fe2+ redox reactivity was found to be controlled directly by R, but was otherwise independent of Ti content (xTi). However, in contrast to previous studies with pure magnetite where UVI was reduced to nanocrystalline uraninite (UO2), the presence of structural Ti (xTi = 0.25 0.53) results in the formation of UIV species that lack the bidentate U-O2-U bridges of uraninite. Extended x-ray absorption fine structure spectroscopic analysis indicated that the titanomagnetite-bound UIV phase has a novel UIV-Ti binding geometry, different from the coordination of UIV in the mineral brannerite (UIVTi2O6). The observed UIV-Ti coordination at a distance of 3.43 Å suggests a binuclear corner-sharing adsorption/incorporation UIV complex with the solid phase. Furthermore, we explored the effect of oxidation (decreasing R) and solids-to-solution ratio on the reduced UIV phase. The formation of the non-uraninite UIV-Ti phase appears to be controlled by availability of surface Ti sites, rather than R. Our work highlights a previously unrecognized role of Ti in the environmental chemistry of UIV and suggests that further work to characterize the long-term stability of UIV phases formed in the presence of Ti is warranted.

Latta, Drew; Pearce, Carolyn I.; Rosso, Kevin M.; Kemner, Kenneth M.; Boyanov, Maxim I.

2013-07-01T23:59:59.000Z

398

Resistance spot welding of Ti-6A1-4V alloy  

SciTech Connect

The effects of weld power, electrode force, electrode tip radius, and elapsed time between cleaning and welding on resistance spot welds in Ti-6Al-4V alloy were evaluated. The alloy is weldable by this technique, and a wide latitude can be taken in processing variables.

Jarboe, D.M.

1980-06-01T23:59:59.000Z

399

Pseudocapacitive Lithium-Ion Storage in Oriented Anatase TiO2 Nanotube Arrays  

SciTech Connect

We report on the synthesis and electrochemical properties of oriented anatase TiO{sub 2} nanotube (NT) arrays as electrodes for Li-ion batteries. The TiO{sub 2} NT electrodes displayed both pseudocapacitive Li{sup +} storage associated with the NT surface and the Li{sup +} storage within the bulk material. The relative contribution of the pseudocapacitive and bulk storages depends strongly on the scan rate. While the charges are stored primarily in the bulk at low scan rates (<< 1 mV/s), the surface storage dominates the total storage capacity at higher scan rates (>1 mV/s). The storage capacity of the NT electrodes as a function of charge/discharge rates showed no dependence on the NT film thickness, suggesting that the Li{sup +} insertion/extraction processes occur homogeneously across the entire length of NT arrays. These results indicated that the electron conduction along the NT walls and the ion conduction within the electrolyte do not cause significant hindering of the charge/discharge kinetics for NT electrode architectures. As a result of the surface pseudocapacitive storage, the reversible Li{sup +} storage capacities for TiO{sub 2} NT electrodes were higher than the theoretical storage capacity for bulk anatase TiO{sub 2} materials.

Zhu, K.; Wang, Q.; Kim, J. H.; Pesaran, A. A.; Frank, A. J.

2012-06-07T23:59:59.000Z

400

(Ba,Sr)TiO3 dielectrics for future stacked- capacitor DRAM  

Science Conference Proceedings (OSTI)

Thin films of barium-strontium titanate (Ba,Sr)TiO3 (BSTO) have been investigated for use as a capacitor dielectric for future generations of dynamic random-access memory (DRAM). This paper describes progress made in the preparation of BSTO ...

D. E. Kotecki; J. D. Baniecki; H. Shen; R. B. Laibowitz; K. L. Saenger; J. J. Lian; T. M. Shaw; S. D. Athavale; C. Cabral; P. R. Duncombe; M. Gutsche; G. Kunkel; Y.-J. Park; Y.-Y. Wang; R. Wise

1999-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" 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.


401

High-field superconductivity in some bcc Ti-Mo and Nb-Zr alloys  

Science Conference Proceedings (OSTI)

Zero electrical resistance at unusually high magnetic field strengths has been observed in the bcc alloys Ti-16 a/o (atomic percent) Mo, Nb-12 a/o Zr, and Nb-25 a/o Zr. The maximum highfield zero-resistance current density, Jc, in these ...

R. R. Hake; T. G. Berlincourt; D. H. Leslie

1962-01-01T23:59:59.000Z

402

Properties of ion implanted Ti-6Al-4V processed using beamline and PSII techniques  

DOE Green Energy (OSTI)

The surface of Ti-6Al-4V (Ti64) alloy has been modified using beamline implantation of boron. In separate experiments, Ti64 has been implanted with nitrogen using a plasma source ion implantation (PSII) technique utilizing either ammonia (NH{sub 3}), nitrogen (N{sub 2}), or their combinations as the source of nitrogen ions. Beamline experiments have shown the hardness of the N-implanted surface saturates at a dose level of {approximately} 4 {times} 10{sup 17} at/cm{sup 2} at {approximately} 10 GPa. The present work makes comparisons of hardness and tribological tests of (1) B implantation using beamline techniques, and (2) N implanted samples using ammonia and/or nitrogen gas in a PSII process. The results show that PSII using N{sub 2} or NH{sub 3} gives similar hardness as N implantation using a beamline process. The presence of H in the Ti alloy surface does not affect the hardness of the implanted surface. Boron implantation increased the surface hardness by as much as 2.5x at the highest dose level. Wear testing by a pin-on-disk method indicated that nitrogen implantation reduced the wear rate by as much as 120x, and boron implantation reduced the wear rate by 6.5x. Increased wear resistance was accompanied by a decreased coefficient of friction.

Walter, K.C.; Woodring, J.S.; Nastasi, M.; Munson, C.M. [Los Alamos National Lab., NM (United States); Williams, J.M.; Poker, D.B. [Oak Ridge National Lab., TN (United States). Solid State Div.

1996-12-31T23:59:59.000Z

403

Variant Selection during Alpha Precipitation in Ti-6Al-4V under the ...  

Science Conference Proceedings (OSTI)

... to available thermodynamic and mobility databases, but also incorporating the ... Characterizing and Exploring the Broad Utility of Kinetic Metallization, ... Effect of Heating Rate on the Short Time Aging Kinetics of Ti-6.8Mo-4.5Fe-1.5Al.

404

Enhanced Photovoltaic Performance of Nanostructured Hybrid Solar Cell Using Highly Oriented TiO2 Nanotubes  

E-Print Network (OSTI)

Enhanced Photovoltaic Performance of Nanostructured Hybrid Solar Cell Using Highly Oriented TiO2 nanotubes can be effectively controlled for the suitable use for a hybrid solar cell by varying the diameter nanotubes to form hybrid solar cells. The open circuit voltage, short circuit current density, fill factor

Cao, Guozhong

405

Band-engineered SrTiO{sub 3} nanowires for visible light photocatalysis  

Science Conference Proceedings (OSTI)

We have theoretically investigated the structural, electronic, and optical properties of perovskite SrTiO{sub 3} nanowires for use in visible light photocatalytic applications using pseudopotential density-functional theory calculations. The electronic structure calculations show that the band gap is modified in the SrTiO{sub 3} nanowires compared with that of the bulk. For TiO{sub 2}-terminated nanowires, the mid-band states induced by the combination of oxygen and strontium atoms on the surface lead to a shift in the valence band toward the conduction band without interference from the edge of the conduction band, which reduces the band gap. On the contrary, the electronic states induced by the combination of oxygen and strontium atoms on the surface of SrO-terminated nanowires lead to a shift in the conduction band toward the valence band. The calculated optical results indicate that the absorption edge of the nanowires shift towards the red-light region. These theoretical results suggest that perovskite SrTiO{sub 3} nanowires are promising candidates for use in visible light photocatalytic processes such as solar-assisted water splitting reactions.

Fu, Q.; He, T.; Li, J. L.; Yang, G. W. [State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong (China)

2012-11-15T23:59:59.000Z

406

China For all ages a MulTi-generaTional exPloraTion  

E-Print Network (OSTI)

China For all ages a MulTi-generaTional exPloraTion The greaT Wall, TerraCoTTa Warriors & The MighCTuresque China Experience the Delights of a Well-Crafted Family Tour Dear Princetonian, Join Princeton Journeys, June 27 ­ July 9, 2013, for a comprehensive tour of China designed with families in mind. Explore

Rowley, Clarence W.

407

Estimation of Radiation Doses in the Marshall Islands Based on Whole Body Counting of Cesium-137 (137Cs) and Plutonium Urinalysis  

SciTech Connect

Under the auspices of the U.S. Department of Energy (USDOE), researchers from the Lawrence Livermore National Laboratory (LLNL) have recently implemented a series of initiatives to address long-term radiological surveillance needs at former nuclear test sites in the Republic of the Marshall Islands (RMI). The aim of this radiological surveillance monitoring program (RSMP) is to provide timely radiation protection for individuals in the Marshall Islands with respect to two of the most important internally deposited fallout radionuclides-cesium-137 ({sup 137}Cs) and long-lived isotopes 239 and 240 of plutonium ({sup 239+240}Pu) (Robison et al., 1997 and references therein). Therefore, whole-body counting for {sup 137}Cs and a sensitive bioassay for the presence of {sup 239+240}Pu excreted in urine were adopted as the two most applicable in vivo analytical methods to assess radiation doses for individuals in the RMI from internally deposited fallout radionuclides (see Hamilton et al., 2006a-c; Bell et al., 2002). Through 2005, the USDOE has established three permanent whole-body counting facilities in the Marshall Islands: the Enewetak Radiological Laboratory on Enewetak Atoll, the Utrok Whole-Body Counting Facility on Majuro Atoll, and the Rongelap Whole-Body Counting Facility on Rongelap Atoll. These whole-body counting facilities are operated and maintained by trained Marshallese technicians. Scientists from LLNL provide the technical support and training necessary for maintaining quality assurance for data acquisition and dose reporting. This technical basis document summarizes the methodologies used to calculate the annual total effective dose equivalent (TEDE; or dose for the calendar year of measurement) based on whole-body counting of internally deposited {sup 137}Cs and the measurement of {sup 239+240}Pu excreted in urine. Whole-body counting provides a direct measure of the total amount (or burden) of {sup 137}Cs present in the human body at the time of measurement. The amount of {sup 137}Cs detected is often reported in activity units of kilo-Becquerel (kBq), where 1 kBq equals 1000 Bq and 1 Bq = 1 nuclear transformation per second (t s{sup -1}). [However, in the United States the Curie (Ci) continues to be used as the unit of radioactivity; where 1 Ci = 3.7 x 10{sup 10} Bq.] The detection of {sup 239}Pu and {sup 240}Pu in bioassay (urine) samples indicates the presence of internally deposited (systemic) plutonium in the body. Urine samples that are collected in the Marshall Islands from volunteers participating in the RSMP are transported to LLNL, where measurements for {sup 239+240}Pu are performed using a state-of-the-art technology based on Accelerator Mass Spectrometry (AMS) (Hamilton et al., 2004, 2007; Brown et al., 2004). The urinary excretion of plutonium by RSMP volunteers is usually described in activity units, expressed as micro-Becquerel ({micro}Bq) of {sup 239+240}Pu (i.e., representing the sum of the {sup 239}Pu and {sup 240}Pu activity) excreted (lost) per day (d{sup -1}), where 1 {micro}Bq d{sup -1} = 10{sup -6} Bq d{sup -1} and 1 Bq = 1 t s{sup -1}. The systemic burden of plutonium is then estimated from biokinetic relationships as described by the International Commission on Radiological Protection (e.g., see ICRP, 1990). In general, nuclear transformations are accompanied by the emission of energy and/or particles in the form of gamma rays ({gamma}), beta particles ({beta}), and/or alpha particles ({alpha}). Tissues in the human body may adsorb these emissions, where there is a potential for any deposited energy to cause biological damage. The general term used to quantify the extent of any radiation exposure is referred to as the dose. The equivalent dose is defined by the average absorbed dose in an organ or tissue weighted by the average quality factor for the type and energy of the emission causing the dose. The effective dose equivalent (EDE; as applied to the whole body), is the sum of the average dose equivalent for each tissue weighted by each applicable tissue-specific weighing factor

Daniels, J; Hickman, D; Kehl, S; Hamilton, T

2007-06-11T23:59:59.000Z

408

Photoluminescence of samarium-doped TiO{sub 2} nanotubes  

SciTech Connect

Samarium (Sm)-modified TiO{sub 2} nanotubes (TNTs) were synthesized by low-temperature soft chemical processing. X-ray powder diffraction analyses of the synthesized Sm-doped and non-doped TNTs show a broad peak near 2{theta}=10{sup o}, which is typical of TNTs. The binding energy of Sm {sup 3}d{sub 5/2} for 10 mol% Sm-doped TNT (1088.3 eV) was chemically shifted from that of Sm{sub 2}O{sub 3} (1087.5 eV), showing that Sm existed in the TiO{sub 2} lattice. Sm-doped TNTs clearly exhibited red fluorescence, corresponding to the doped Sm{sup 3+} ion in the TNT lattice. The Sm-doped TNT excitation spectrum exhibited a broad curve, which was similar to the UV-vis optical absorption spectrum. Thus, it was considered that the photoluminescence emission of Sm{sup 3+}-doped TNT with UV-light irradiation was caused by the energy transfer from the TNT matrix via the band-to-band excitation of TiO{sub 2} to the Sm{sup 3+} ion. - Graphical Abstract: Samarium-doped TiO{sub 2} nanotubes (TNTs) having a nanotubular structure were synthesized by soft chemical route. It was revealed that the energy associated by the band-to-band excitation of TNT matrix transferred to the doped Sm{sup 3+} ions in the lattice, resulting in emission of strong and visible red fluorescence. Highlights: > Sm-doped TiO{sub 2} nanotubes synthesized by low-temperature soft chemical processing. > Sm{sup 3+} substitutes Ti{sup 4+} ions in the nanotube lattice. > Clear fluorescent emission due to the f-f transition at the Sm{sup 3+} in a crystal field environment. > Band-to-band excitation of TiO{sub 2} and followed energy transfer to Sm{sup 3+} causes the luminescence.

Park, Dong Jin [Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan); Sekino, Tohru, E-mail: sekino@tagen.tohoku.ac.jp [Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan); Tsukuda, Satoshi [Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan); Hayashi, Asuka [Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047 (Japan); Kusunose, Takafumi [Faculty of Engineering, Kagawa University, Hayashi 2217-20, Takamatsu, Kagawa 761-0396 (Japan); Tanaka, Shun-Ichiro [Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)

2011-10-15T23:59:59.000Z

409

Photocatalytic degradation of 4-chlorophenol: The effects of varying TiO{sub 2} concentration and light wavelength  

Science Conference Proceedings (OSTI)

The effects of TiO{sub 2} surface loading and light conditions on the photocatalyzed degradation of 4-chlorophenol (4-CP) were examined, in order to address deficiencies in previous studies in which these issues were not examined satisfactorily. It is proposed that these factors explain differences in the reported reaction intermediate concentrations. Increasing the loading of TiO{sub 2} in a slurry has little effect on the rate of 4-CP disappearance. However, the concentration of 4-chlorocatechol (4-CC), a primary degradation product decreases with increasing TiO{sub 2}. The rate of mineralization increased with increasing TiO{sub 2} concentration was more rapid under conditions of lower light intensity. Significant adsorption of 4-CC on Degussa P25 TiO{sub 2} was measured and these data are fitted well by a Langmuir isotherm. Adsorption of 4-CC accounts for most of the changes in 4-CC concentration at different TiO{sub 2} loadings. An increased proportion of surface oxidation reactions at higher TiO{sub 2} loadings and lower light intensity may explain the higher rates of mineralization in thicker slurries. The quantum yield of reaction of 4-CP increased with decreasing wavelength of light from {phi} = 0.0 1, at {lambda} = 360 nm to {phi} = 0.07, at {lambda} = 300 nm. A relationship of d[4-CP]/dt {proportional_to} I{sup 0.8} was measured. 29 refs., 7 figs., 4 tabs.

Stafford, U.; Gray, K.A.; Kamat, P.V. [Univ. of Notre Dame, IN (United States)

1997-04-01T23:59:59.000Z

410

Electronic and optical properties of TiCoSb under different pressures  

Science Conference Proceedings (OSTI)

The electronic structure and optical properties of TiCoSb are studied by the first-principles calculation. It is found that the band gaps increase with the pressure increasing. It is noted that the increase of the band gap is due to the electrons of Ti 3d and Co 3d of the valence band (VB) shifting away from the Fermi level. Our calculation indicates that TiCoSb has the large density of state near the Fermi level; moreover, the changes of the density of states near the Fermi level mainly are caused by Ti 3d and Co 3d under the different pressures. It is noted that the absorption edge increases with an increase of pressure. As pressure increases, the static dielectric constants {epsilon}{sub 1}(0) decrease. All peaks of the imaginary part of the dielectric function {epsilon}{sub 2}({omega}) move towards higher energies within increasing pressure. - Graphical abstract: The first peak positions of the absorption spectrum increase and shift the high energy with an increase of pressure. The buleshift of the absorption edge could be observed. Highlights: Black-Right-Pointing-Pointer It is noted that the increase of the band gap is due to the electrons of Ti 3d and Co 3d of VB moving away from the Fermi level. Black-Right-Pointing-Pointer It is noted that the absorption edge increases with an increase of pressure. Black-Right-Pointing-Pointer As pressure increases, the static dielectric constant {epsilon}{sub 1}(0) decreases. Black-Right-Pointing-Pointer All peaks of the imaginary part of the dielectric function {epsilon}{sub 2}({omega}) move to wards higher energies within creasing pressure.

Xu Bin, E-mail: hnsqxb@163.com [Department of Mathematics and Information Sciences, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011 (China); Zhang Jing [Department of Mathematics and Information Sciences, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011 (China); Liang Jianchu [Department of electronic science, Huizhou University, Guangdong 516001 (China); Gao Guoying; Yi Lin [Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)

2012-08-15T23:59:59.000Z

411

Lattice variations of Ti-6Al-4V alloy with hydrogen content  

Science Conference Proceedings (OSTI)

Effect of hydrogen content on the lattice parameter of Ti-6Al-4V alloy has been investigated by X-ray diffraction. The experimental results show that the solution of hydrogen in the Ti-6Al-4V alloy affects significantly on the lattice parameters of {alpha}, {beta} and {delta} phases, especially the {beta} phase. Furthermore, the critical hydrogen content of {delta} hydride formation for Ti-6Al-4V alloy is 0.385 wt.%. When the hydrogen content is lower than the critical hydrogen content, the {delta} hydride cannot precipitate and the lattice parameter ({alpha}) of {beta} phase linearly increases with the increasing of hydrogen content. When the hydrogen content is higher than the critical hydrogen content, the {delta} hydride precipitates and the lattice parameter ({alpha}) of {beta} phase varies inconspicuously with hydrogen content. In addition, the effects of lattice variations and {delta} hydride formation on microstructure are discussed. The {alpha}/{beta} interfaces of lamellar transformed {beta} phase become fuzzy with the increasing of hydrogen content because of the lattice expansion of {beta} phase. Compared with that of the Ti-6Al-4V alloy at low hydrogen content ({=} 0.385 wt.%) were completely reversed due to the formation of {delta} hydride. - Research Highlights: {yields} A novel method for determining {delta} hydride in Ti-6Al-4V alloy is presented. {yields} The critical hydrogen content of {delta} hydride formation is 0.385 wt.%. {yields} The lattice parameter of {beta} phase can be expressed as follows: a=0.323(1+9.9x10{sup -2}C{sub H}) . {yields} Precipitation of {delta} hydride has a significant influence on the microstructure. {yields} The {alpha}/{beta} interfaces of transformed {beta} phase became fuzzy in the hydrogenated alloy.

Zhu Tangkui, E-mail: zhutangkui@sohu.com; Li, Miaoquan, E-mail: honeymli@nwpu.edu.cn

2011-07-15T23:59:59.000Z

412

Radiation doses for Marshall Islands Atolls Affected by U.S. Nuclear Testing:All Exposure Pathways, Remedial Measures, and Environmental Loss of 137Cs  

SciTech Connect

The United States conducted 24 nuclear tests at Bikini Atoll with a total yield of 76.8 Megatons (MT). The Castle series produced about 60% of this total and included the Bravo test that was the primary source of contamination of Bikini Island and Rongelap and Utrok Atolls. One of three aerial drops missed the atoll and the second test of the Crossroads series, the Baker test, was an underwater detonation. Of the rest, 17 were on barges on water and 3 were on platforms on an island; they produced most of the contamination of islands at the atoll. There were 42 tests conducted at Enewetak Atoll with a total yield of 31.7 MT (Simon and Robison, 1997; UNSCEAR, 2000). Of these tests, 18 were on a barge over wateror reef, 7 were surface shots, 2 aerial drops, 2 under water detonations, and 13 tower shots on either land or reef. All produced some contamination of various atoll islands. Rongelap Atoll received radioactive fallout as a result of the Bravo test on March 1, 1954 that was part of the Castle series of tests. This deposition was the result of the Bravo test producing a yield of 15 MT, about a factor of three to four greater than the predicted yield that resulted in vaporization of more coral reef and island than expected and in the debris-cloud reaching a much higher altitude than anticipated. High-altitude winds were to the east at the time of detonation and carried the debris-cloud toward Rongelap Atoll. Utrok Atoll also received fallout from the Bravo test but at much lower air and ground-level concentrations than at Rongelap atoll. Other atolls received Bravo fallout at levels below that of Utrok [other common spellings of this island and atoll (Simon, et al., 2009)]. To avoid confusion in reading other literature, this atoll and island are spelled in a variety of ways (Utrik, Utirik, Uterik or Utrok). Dose assessments for Bikini Island at Bikini Atoll (Robison et al., 1997), Enjebi Island at Enewetak Atoll (Robison et al., 1987), Rongelap Island at Rongelap Atoll (Robison et al., 1994; Simon et al., 1997), and Utrok Island at Utrok Atoll (Robison, et al., 1999) indicate that about 95-99% of the total estimated dose to people who may return to live at the atolls today (Utrok Island is populated) is the result of exposure to {sup 137}Cs. External gamma exposure from {sup 137}Cs in the soil accounts for about 10 to 15% of the total dose and {sup 137}Cs ingested during consumption of local food crops such as drinking coconut meat and fluid (Cocos nucifera L.), copra meat and milk, Pandanus fruit, and breadfruit accounts for about 85 to 90%. The other 1 to 2% of the estimated dose is from {sup 90}Sr, {sup 239+240}Pu, and {sup 241}Am. The {sup 90}Sr exposure is primarily through the food chain while the exposure to {sup 239+240}Pu, and {sup 241}Am is primarily via the inhalation pathway as a result of breathing re-suspended soil particles.

Robison, W L; Hamilton, T F

2009-04-20T23:59:59.000Z

413

Preparation and photocatalytic activity of high-efficiency visible-light-responsive photocatalyst SnS{sub x}/TiO{sub 2}  

Science Conference Proceedings (OSTI)

Visible-light-responsive composite photocatalysts SnS{sub 2}/TiO{sub 2} and SnS/TiO{sub 2} with different mass ratios were prepared by in-situ synthesis technology in solution with commercial TiO{sub 2}. The junction-based materials SnS{sub x} (x=1, 2)/TiO{sub 2} were found to have high visible-light photocatalytic performance and possess much better activity than the single-phase SnS{sub x} or TiO{sub 2}. The greatly enhanced photocatalytic activity of the SnS{sub x}/TiO{sub 2} composites was mainly attributed to the matching band potentials and efficient charge transfer and separation at the tight-bonding interface between SnS{sub x} and TiO{sub 2}. The fact was confirmed by the comparison of photocatalytic activities of the SnS{sub 2}/TiO{sub 2} samples prepared by physical mixing method and in-situ synthesis technique. - Graphical Abstract: Visible-light-responsive composite photocatalysts SnS{sub 2}/TiO{sub 2} and SnS/TiO{sub 2} with different mass ratios were prepared by in-situ synthesis technology in solution with commercial TiO{sub 2}. The photocatalysts SnS{sub x} (x=1, 2) and SnS{sub x}/TiO{sub 2} possess excellent photocatalytic activities. The greatly enhanced photocatalytic activity of the SnS{sub x}/TiO{sub 2} composites was mainly attributed to the matching band potentials and efficient charge transfer and separation at the tight-bonding interface between SnS{sub x} and TiO{sub 2}.

Yang Chongyin; Wang Wendeng; Shan Zhichao [State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China); Huang Fuqiang, E-mail: huangfq@mail.sic.ac.c [State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)

2009-04-15T23:59:59.000Z

414

PLANTS AS BIO-MONITORS FOR 137CS, 238PU, 239, 240PU AND 40K AT THE SAVANNAH RIVER SITE  

SciTech Connect

The nuclear fuel cycle generates a considerable amount of radioactive waste, which often includes nuclear fission products, such as strontium-90 ({sup 90}Sr) and cesium-137 ({sup 137}Cs), and actinides such as uranium (U) and plutonium (Pu). When released into the environment, large quantities of these radionuclides can present considerable problems to man and biota due to their radioactive nature and, in some cases as with the actinides, their chemical toxicity. Radionuclides are expected to decay at a known rate. Yet, research has shown the rate of elimination from an ecosystem to differ from the decay rate due to physical, chemical and biological processes that remove the contaminant or reduce its biological availability. Knowledge regarding the rate by which a contaminant is eliminated from an ecosystem (ecological half-life) is important for evaluating the duration and potential severity of risk. To better understand a contaminants impact on an environment, consideration should be given to plants. As primary producers, they represent an important mode of contamination transfer from sediments and soils into the food chain. Contaminants that are chemically and/or physically sequestered in a media are less likely to be bio-available to plants and therefore an ecosystem.

Caldwell, E.; Duff, M.; Ferguson, C.

2010-12-16T23:59:59.000Z

415

Li4Ti5O12 as an anode material for Li ion batteries in situ XRD and XPS studies.  

E-Print Network (OSTI)

?? This thesis examines parts of the kinetics and performance in Li-battery cells using lithium titanate anodes and lithium manganese oxide cathodes. Lithium titanate (Li4Ti5O12)… (more)

Nordh, Tim

2013-01-01T23:59:59.000Z

416

Modification of the spontaneous emission of CdTe nanocrystals in TiO 2 inverted opals  

Science Conference Proceedings (OSTI)

A light source in a three-dimensional photonic crystal has been realized by depositing CdTenanocrystals on the inner surface of TiO 2 inverted opalfilms. Two effects

V. G. Solovyev; S. G. Romanov; C. M. Sotomayor Torres; M. Müller; R. Zentel; N. Gaponik; A. Eychmüller; A. L. Rogach

2003-01-01T23:59:59.000Z

417

T ti E St S tTetiaroa Energy Storage System Estimated ZBB Zinc Bromide Battery Performance and Costs  

E-Print Network (OSTI)

T ti E St S tTetiaroa Energy Storage System Estimated ZBB Zinc Bromide Battery Performance and Costs Prull / KammenPrull / Kammen Renewable and Appropriate Energy Lab, UC Berkeley 7/26/2010 http

Kammen, Daniel M.

418

Adsorption of TiCl[sub 4], SiH[sub 4], and HCl on Si(100): Application to TiSi[sub 2] chemical vapor deposition and Si etching  

SciTech Connect

The interactions of TiCl[sub 4], SiH[sub 4], and HCl with Si(100) have been investigated by temperature programmed desorption (TPD) with the goal of better understanding the initial stages of TiSi[sub 2] chemical vapor deposition for circuit metallization and wafer etching with HCl/H[sub 2]. Coadsorption experiments with TiCl[sub 4] and SiH[sub 4] show that under most conditions H[sub 2] and SiCl[sub 2] are the main desorption products, with Ti being left behind on the surface. HCl is a minor product. However, at sufficiently low exposures of either TiCl[sub 4] or SiH[sub 4], the desorption of SiCl[sub 2] or H[sub 2], respectively, is inhibited in favor of HCl. A kinetic model involving formation of an HCl complex at defects has been formulated which explains the results quantitatively. HCl adsorption gives rise to the principal desorption products SiCl[sub 2] and H[sub 2], with HCl as a minor product. The kinetic behavior can also be explained quantitatively with the proposed model. Implications for TiSi[sub 2] growth are discussed with reference to possible growth temperatures and source gas pressures. The mechanism for etching by HCl is further elucidated.

Mendicino, M.A.; Seebauer, E.G. (Univ. of Illinois, Urbana, IL (United States). Dept. of Chemical Engineering)

1993-06-01T23:59:59.000Z

419

Influence of projectile neutron number in the {sup 208}Pb({sup 48}Ti, n){sup 255}Rf and {sup 208}Pb({sup 50}Ti, n){sup 257}Rf reactions  

Science Conference Proceedings (OSTI)

Four isotopes of rutherfordium, {sup 254-257}Rf, were produced by the {sup 208}Pb({sup 48}Ti, xn){sup 256-x}Rf and {sup 208}Pb({sup 50}Ti, xn){sup 258-x}Rf reactions (x=1,2) at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. Excitation functions were measured for the 1n and 2n exit channels. A maximum likelihood technique, which correctly accounts for the changing cross section at all energies subtended by the targets, was used to fit the 1n data to allow a more direct comparison between excitation functions obtained under different experimental conditions. The maximum 1n cross sections of the {sup 208}Pb({sup 48}Ti, n){sup 255}Rf and {sup 208}Pb({sup 50}Ti, n){sup 257}Rf reactions obtained from fits to the experimental data are 0.38{+-}0.07 nb and 40{+-}5 nb, respectively. Excitation functions for the 2n exit channel were also measured, with maximum cross sections of 0.40{sub -0.17}{sup +0.27} nb for the {sup 48}Ti induced reaction, and 15.7{+-}0.2 nb for the {sup 50}Ti induced reaction. The impact of the two neutron difference in the projectile on the 1n cross section is discussed. The results are compared to the Fusion by Diffusion model developed by Swiatecki, Wilczynska, and Wilczynski.

Dragojevic, I.; Garcia, M. A.; Gates, J. M.; Nelson, S. L.; Nitsche, H. [Department of Chemistry, University of California, Berkeley, California 94720 (United States); Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Gregorich, K. E.; Stavsetra, L.; Sudowe, R. [Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Duellmann, Ch. E. [Department of Chemistry, University of California, Berkeley, California 94720 (United States); Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Abteilung Kernchemie, Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany)

2008-08-15T23:59:59.000Z

420

Microstructural characterization and mechanical property of active soldering anodized 6061 Al alloy using Sn-3.5Ag-xTi active solders  

SciTech Connect

Active solders Sn-3.5Ag-xTi varied from x = 0 to 6 wt.% Ti addition were prepared by vacuum arc re-melting and the resultant phase formation and variation of microstructure with titanium concentration were analyzed using X-ray diffraction, optical microscopy and scanning electron microscopy. The Sn-3.5Ag-xTi active solders are used as metallic filler to join with anodized 6061 Al alloy for potential applications of providing a higher heat conduction path. Their joints and mechanical properties were characterized and evaluated in terms of titanium content. The mechanical property of joints was measured by shear testing. The joint strength was very dependent on the titanium content. Solder with a 0.5 wt.% Ti addition can successfully wet and bond to the anodized aluminum oxide layers of Al alloy and posses a shear strength of 16.28 {+-} 0.64 MPa. The maximum bonding strength reached 22.24 {+-} 0.70 MPa at a 3 wt.% Ti addition. Interfacial reaction phase and chemical composition were identified by a transmission electron microscope with energy dispersive spectrometer. Results showed that the Ti element reacts with anodized aluminum oxide to form Al{sub 3}Ti-rich and Al{sub 3}Ti phases at the joint interfaces. - Highlights: Black-Right-Pointing-Pointer Active solder joining of anodized Al alloy needs 0.5 wt.% Ti addition for Sn-3.5Ag. Black-Right-Pointing-Pointer The maximum bonding strength occurs at 3 wt.% Ti addition. Black-Right-Pointing-Pointer The Ti reacts with anodized Al oxide to form Al{sub 3}Ti-rich and Al{sub 3}Ti at joint interface.

Wang, Wei-Lin, E-mail: wangwl77@gmail.com; Tsai, Yi-Chia, E-mail: tij@itri.org.tw

2012-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "ti rb cs" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Lanthanum diffusion in the TiN/LaOx/HfSiO/SiO2/Si stack  

Science Conference Proceedings (OSTI)

Band edge Complementary Metal Oxide Semiconductor (CMOS) devices are obtained by insertion of a thin LaO"x layer between the high-k (HfSiO) and metal gate (TiN). High temperature post deposition anneal induces Lanthanum diffusion across the HfSiO towards ... Keywords: APT, ATR-FTIR, HfSiO, Interfacial dipole, La, Metal/high-k stack, S-XPS, Threshold voltage tuning, TiN, ToF-SIMS

E. Martinez; P. Ronsheim; J. -P. Barnes; N. Rochat; M. Py; M. Hatzistergos; O. Renault; M. Silly; F. Sirotti; F. Bertin; N. Gambacorti

2011-07-01T23:59:59.000Z

422

Removal of heavy metals from aqueous waste streams using surface-modified nanosized TiO{sub 2} photocatalysts.  

DOE Green Energy (OSTI)

Titanium dioxide (TiO{sub 2}) colloidal particles ({approximately}45{angstrom}) whose surfaces were modified with chelating agents for photocatalytic removal of heavy-metal ions and their subsequent reduction to metallic form were investigated. Experiments were performed on nanoparticle TiO{sub 2} colloids derivatized with bidentate and tridentate ligands (thiolactic acid [TLA], cysteine, and alanine [ALA]) in batch mode in a photoreactor with 254nm light. We used catalysts designed and synthesized for selective and efficient removal of Pb and Cu with and without added hole scavenger (methanol). Parallel experiments also have been carried out in the dark to study metal ion adsorption properties. Solutions have been filtered to remove TiO{sub 2}, and metal particulates. Both the native solution and the metal deposited on the nanocrystalline TiO{sub 2} particles were analyzed. Results demonstrate that for the case of lead, the most effective TiO{sub 2} surface modifier was TLA (>99% Pb(II) removed from solution). Experiments performed to study Cn removal using TiO{sub 2} colloids modified with alanine showed that copper ions were effectively removed and reduced to metallic form in the presence of methanol.

Meshkov, N. K.

1998-08-27T23:59:59.000Z

423

Liquid impact erosion mechanism and theoretical impact stress analysis in TiN-coated steam turbine blade materials  

SciTech Connect

Coating of TiN film was done by reactive magnetron sputter ion plating to improve the liquid impact erosion resistance of steam turbine blade materials, 12Cr steel and Stellite 6B, for nuclear power plant application. TiN-coated blade materials were initially deformed with depressions due to plastic deformation of the ductile substrate. The increase in the curvature in the depressions induced stress concentration with increasing number of impacts, followed by circumferential fracture of the TiN coating due to the circular propagation of cracks. The liquid impact erosion resistance of the blade materials was greatly improved by TiN coating done with the optimum ion plating condition. Damage decreased with increasing TiN coating thickness. According to the theoretical analysis of stresses generated by liquid impact, TiN coating alleviated the impact stress of 12Cr steel and Stellite 6B due to stress attenuation and stress wave reactions such as reflection and transmission at the coating-substrate interface.

Lee, M.K.; Kim, W.W.; Rhee, C.K.; Lee, W.J. [Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering

1999-04-01T23:59:59.000Z

424

L NATJDNAL BNII?GY TiEHMOLOGY LIBOCAYOlY V.0. DEPARTMENT OF  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

NATJDNAL BNII?GY TiEHMOLOGY LIBOCAYOlY NATJDNAL BNII?GY TiEHMOLOGY LIBOCAYOlY V.0. DEPARTMENT OF Albany, OR .Morgantown, WV s Plllsburgh, PA @ENERGY Januaty 27,201 1 MEMORANDUM FOR MAXI( J. MATARRESE DIRECTOR, OFFICE OF ENVIRONMENT, SECURITY, SAFETY AND HEALTH l c ? FROM: \ DIVISION SUBJECT: Amual Natioilal Enviro~l~neiltal Policy Act (NEPA) Planning Summary for 2011 The attached documents conlprise the 201 1 Allnual NEPA Planning Summary for the National Enexgy TechnologyLaboratory. The infoimation is presented according to the guidance and fonnats provided by DOE'SNEPA office. As required by the Order 451.1B, the Annual NEPA Pla~lning Siimmary will be made available to the public. Please contact nte for any additional info~.mation regarding r\lETL,'s NEPA plans. Distribution: A. Chlgini

425

U.S. DEPARTMENT OF ENERGY EERE PROJECT MA.i\IAGE\tiE~TCE~TER  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

MA.i\IAGE\tiE~TCE~TER MA.i\IAGE\tiE~TCE~TER NEPA DETERMINATION Page 1 of2 RECIPIENT:Brayton Energy STATE: MA PROJECT TITLE: High-Efficiency Low-Cost Solar Receiver for use in a Supercritical C02 Recompression Cycle Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number CID Number DE-FOA-0000595 DE-EE0005799 GF0-0005799-{)01 G05799 Based on my review of the information concerning the proposed action, as NEPA Compliance Officer (authorized under DOE Order 451.1A), I have made the foUowing determination: CX, EA, EIS APPENDIX AND NUMBER: Description: A9 Information gathering, analysis, and dissemination Information gathering (including, 'but not limited to, literature surveys, inventories, site vrsits, and audits}, data analysis (including, but not limited to, computer modeling}, document preparation

426

Current-Controlled Negative Differential Resistance due to Joule Heating in TiO2  

E-Print Network (OSTI)

We show that Joule heating causes current-controlled negative differential resistance (CC-NDR) in TiO2 by constructing an analytical model of the voltage-current V(I) characteristic based on polaronic transport for Ohm's Law and Newton's Law of Cooling, and fitting this model to experimental data. This threshold switching is the 'soft breakdown' observed during electroforming of TiO2 and other transition-metal-oxide based memristors, as well as a precursor to 'ON' or 'SET' switching of unipolar memristors from their high to their low resistance states. The shape of the V(I) curve is a sensitive indicator of the nature of the polaronic conduction.

A. S. Alexandrov; A. M. Bratkovsky; B. Bridle; S. E. Savel'ev; D. B. Strukov; R. Stanley Williams

2011-08-15T23:59:59.000Z

427

Spectral Content of 22Na/44Ti Decay Data: Implications for a Solar Influence  

E-Print Network (OSTI)

We report a reanalysis of data on the measured decay rate ratio $^{22}$Na/$^{44}$Ti which were originally published by Norman et al., and interpreted as supporting the conventional hypothesis that nuclear decay rates are constant and not affected by outside influences. We find upon a more detailed analysis of both the amplitude and the phase of the Norman data that they actually favor the presence of an annual variation in $^{22}$Na/$^{44}$Ti, albeit weakly. Moreover, this conclusion holds for a broad range of parameters describing the amplitude and phase of an annual sinusoidal variation in these data. The results from this and related analyses underscore the growing importance of phase considerations in understanding the possible influence of the Sun on nuclear decays. Our conclusions with respect to the phase of the Norman data are consistent with independent analyses of solar neutrino data obtained at Super-Kamiokande-I and the Sudbury Neutrino Observatory (SNO).

Daniel O'Keefe; Brittany L. Morreale; Robert H. Lee; John B. Buncher; Ephraim Fischbach; Tom Gruenwald; Jere H. Jenkins; Daniel Javorsek II; Peter A. Sturrock

2012-12-10T23:59:59.000Z

428

The influence of temperature on the color of TiO{sub 2}:Cr pigments  

Science Conference Proceedings (OSTI)

TiO{sub 2}:Cr brown pigments were prepared via a polymeric precursor derived from the Pechini method. The pigments were analyzed by infrared spectroscopy, X-ray diffraction, ultraviolet-vis spectroscopy, and colorimetry. The increase of the calcination temperature from 700 to 1000 deg. C led to a decrease in the L* values, corresponding to darkening of the pigments. The pigments obtained in this work are darker than those produced by a solid-state reaction method reported before. The change in the pigment color is due to the anatase-rutile phase transition, which leads to a shift in the charge transfer bond (Ti{sup 4+} {r_reversible} O{sup 2-}) due to a change in the crystal field around the chromophore ions. Moreover, the oxidation state of chromium was observed to change, and this also alters the color of the pigments.

Gomes Vieira, Fagner Ticiano; Silva Melo, Danniely [LACOM, Departamento de Quimica, Centro de Ciencias Exatas e da Natureza, Universidade Federal da Paraiba, Cidade Universitaria, Campus I, CEP:58059 900, Joao Pessoa, PB (Brazil); Jackson Guedes de Lima, Severino [LSR, Departamento de Engenharia Mecanica, Universidade Federal da Paraiba, Joao Pessoa, PB (Brazil); Longo, Elson [CMDMC-LIEC, Instituto de Quimica, Universidade Estadual Paulista, Araraquara, SP (Brazil); Paskocimas, Carlos Alberto [Departamento de Engenharia Mecanica, Universidade Federal do Rio Grande do Norte, Natal, RN (Brazil); Silva Junior, Wilson [Icra Produtos para Ceramica, Mogi Guacu, SP (Brazil); Gouveia de Souza, Antonio [LACOM, Departamento de Quimica, Centro de Ciencias Exatas e da Natureza, Universidade Federal da Paraiba, Cidade Universitaria, Campus I, CEP:58059 900, Joao Pessoa, PB (Brazil); Garcia dos Santos, Ieda Maria [LACOM, Departamento de Quimica, Centro de Ciencias Exatas e da Natureza, Universidade Federal da Paraiba, Cidade Universitaria, Campus I, CEP:58059 900, Joao Pessoa, PB (Brazil)], E-mail: ieda@quimica.ufpb.br

2009-05-06T23:59:59.000Z

429

INTERFACE DISORDER CONTROLLED SUPERCONDUCTIVITY YBa2Cu3O7 / SrTiO3 SUPERLATTICES  

SciTech Connect

We report on the coherent growth of ultrathin YBa2Cu3O7 (YBCO) layers on SrTiO3 (STO) in YBCO/STO superlattices. The termination plane of the STO is TiO2 and the CuO chains are missing at the interface. Disorder (steps) at the STO interface cause alterations of the stacking sequence of the intra-cell YBCO atomic layers. Stacking faults give rise to antiphase boundaries which break the continuity of the CuO2 planes and depress superconductivity. We show that superconductivity is directly controlled by interface disorder outlining the importance of pair breaking and localization by disorder in ultrathin layers.

Garcia-Barriocanal, Javier [Universidad Complutense, Spain; Rivera-Calzada, Alberto [Universidad Complutense, Spain; Sefrioui, Z. [Universidad Complutense, Spain; Arias, D [Universidad Complutense, Spain; Varela del Arco, Maria [ORNL; Leon, C. [Universidad Complutense, Spain; Pennycook, Stephen J [ORNL; Santamaria, J. [Universidad Complutense, Spain

2013-01-01T23:59:59.000Z

430

Improvement of thermoelectric properties for half-Heusler TiNiSn by interstitial Ni defects  

SciTech Connect

We have synthesized off-stoichiometric Ti-Ni-Sn half-Heusler thermoelectrics in order to investigate the relation between randomly distributed defects and thermoelectric properties. A small change in the composition of Ti-Ni-Sn causes a remarkable change in the thermal conductivity. An excess content of Ni realizes a low thermal conductivity of 2.93 W/mK at room temperature while keeping a high power factor. The low thermal conductivity originates in the defects generated by an excess content of Ni. To investigate the detailed defect structure, we have performed first-principles calculations and compared with x ray photoemission spectroscopy measurement. Based on these analyses, we conclude that the excess Ni atoms randomly occupy the vacant sites in the half-Heusler structure, which play as phonon scattering centers, resulting in significant improvement of the figure of merit without any substitutions of expensive heavy elements, such as Zr and Hf.

Hazama, Hirofumi; Matsubara, Masato; Asahi, Ryoji [Toyota Central R and D Labs., Inc., Nagakute, Aichi 480-1192 (Japan); Takeuchi, Tsunehiro [Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 (Japan)

2011-09-15T23:59:59.000Z

431

Nanopattern-stimulated superconductor-insulator transition in thin TiN films.  

SciTech Connect

We present the results of the comparative study of transport properties of continuous and nanoperforated TiN films, enabling us to separate the disorder and the geometry effects. Nanopatterning transforms a thin TiN film into an array of superconducting weak links and eo ipso stimulates the disorder- and magnetic-field-driven superconductor-to-insulator transitions, shifting both transitions to a lower degree of microscopic disorder. We observe magnetoresistance oscillations reflecting collective phase-frustration behaviour of the multiconnected superconducting weak link network in a wide range of temperatures. We find that nanopatterning enhances the role of the two-dimensional Coulomb interaction and changes the characteristic energies of the film on length scales significantly larger than the mean free path or the superconducting coherence length.

Baturina, T. I.; Vinokur, V. M.; Mironov, A. Yu.; Chtchelkatchev, N. M.; Nasimov, D. A.; Latyshev, A. V. (Materials Science Division); (A. V. Rzhanov Inst. Semoconductor Physics); (Russian Academy of Sciences)

2011-02-01T23:59:59.000Z

432

Mesoporous TiO2 spheres with a nitridated conducting layer  

Science Conference Proceedings (OSTI)

Nitridated TiO2 mesoporous spheres have been synthesized by hydrothermal processing followed by post-nitridation with NH3. Characterization data reveal a nitridated conducting layer, in addition to a mesoporous, and nanosized building-block morphology resulting in a large surface area. The samples have an average pore size and surface area of, respectively, 10 nm and 87 m2/g. The nitridated TiO2 mesoporous spheres exhibit a high capacity of > 200 mAh/g with good cyclability and high rate capability, as the nitridated conducting layer and favorable morphology of nanosized spheres provides good electrical contact, accommodates cycling induced strain smoothly, and facilitates lithium-ion diffusion.

Yoon, Sukeun [ORNL; Bridges, Craig A [ORNL; Unocic, Raymond R [ORNL; Paranthaman, Mariappan Parans [ORNL

2013-01-01T23:59:59.000Z

433

Enhanced photocatalytic activity of Ag microgrid connected TiO{sub 2} nanocrystalline films  

SciTech Connect

One reason for the high degree of photogenerated carrier recombination was found to be the charge accumulation caused by the uneven reaction area on the photocatalyst surface. The authors connected TiO{sub 2} nanoparticles with conducting Ag microgrid. Obvious photocatalytic activity improvement (81%) over the pure TiO{sub 2} was observed, which is attributed to the electron-hole pairs separation by the metal-semiconductor contact and the large specific area of metal grid, which increased the O{sub 2} absorption and transported the electrons to the sites needed for the deoxidize reactions. This structure lowers the electron accumulation on the particles and improves the utilization ratio of the photoexcited carriers.

Pan Feng; Zhang Junying; Zhang Weiwei; Wang Tianmin; Cai Chao [Center of Materials Physics and Chemistry, Beihang University, Beijing 100083 (China)

2007-03-19T23:59:59.000Z

434

High energy terahertz pulses from organic crystals: DAST and DSTMS pumped at Ti:sapphire wavelength  

E-Print Network (OSTI)

High energy terahertz pulses are produced by optical rectification (OR) in organic crystals DAST and DSTMS by a Ti:sapphire amplifier system centered at 0.8 microns. The simple scheme provides broadband spectra between 1 and 5 THz, when pumped by collimated 60 fs near-infrared pump pulse and it is scalable in energy. Fluence-dependent conversion efficiency and damage threshold are reported as well as optimized OR at visible wavelength.

Monoszlai, B; Jazbinsek, M; Hauri, C P

2013-01-01T23:59:59.000Z

435

Mesoporous TiO2-B Microspheres with Superior Rate Performance for Lithium Ion Batteries  

SciTech Connect

Mesoporous TiO2-B microsperes with a favorable material architecture are designed and synthesized for high power lithium ion batteries. This material, combining the advantages of fast lithium transport with a pseudocapacitive mechanism, adequate electrode-electrolyte contact and compact particle packing in electrode layer, shows superior high-rate charge-discharge capability and long-time cyclability for lithium ion batteries.

Liu, Hansan [ORNL; Bi, Zhonghe [ORNL; Sun, Xiao-Guang [ORNL; Unocic, Raymond R [ORNL; Paranthaman, Mariappan Parans [ORNL; Dai, Sheng [ORNL; Brown, Gilbert M [ORNL

2011-01-01T23:59:59.000Z

436

Synthesis of mesoporous NiO doped TiO{sub 2} submicrosphere via spray hydrolysis  

Science Conference Proceedings (OSTI)

NiO doped TiO{sub 2} submicrosphere have been prepared via spray hydrolysis. The doping concentration has been varied form 2 wt% to 15 wt%. Morphology of the submicrospheres has been investigated using small-angle neutron scattering and scanning electron microscopy. Elemental analysis has been carried out by energy dispersive X-ray analysis which confirms the doping concentrations. The mesopores in submicrospheres possess cylindrical morphology.

Bahadur, J.; Sen, D.; Prakash, J.; Singh, Ripandeep; Paul, B.; Mazumder, S.; Sathiyamoorthy, D. [Solid State Physics Division Bhabha Atomic Research Centre, Mumbai, 400085, India (India); Powder Metallurgy Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Solid State Physics, Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Materials Processing Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Solid State Physics Division Bhabha Atomic Research Centre, Mumbai, 400085 (India); Powder Metallurgy Division Bhabha Atomic Research Centre, Mumbai, 400085 (India)

2012-06-05T23:59:59.000Z

437

Importance of Diffusion in Methanol Photochemistry on TiO2(110)  

Science Conference Proceedings (OSTI)

The photoactivity of methanol on the rutile TiO2(110) surface is shown to depend on the ability of methanol to diffuse on the surface and find sites active for its thermal dissociation to methoxy. Temperature programmed desorption (TPD) results show that the extent of methanol photodecomposition to formaldehyde is negligible on the clean TiO2(110) surface at 100 K due to a scarcity of sites that can convert (photoinactive) methanol to (photoactive) methoxy. The extent of photoactivity at 100 K significantly increases when methanol is coadsorbed with oxygen, however only those molecules able to adsorb near (next to) a coadsorbed oxygen species are active. Preannealing coadsorbed methanol and oxygen to above 200 K prior to UV irradiation results in a significant increase in photoactivity. Scanning tunneling microscopy (STM) images clearly show that the advent of increased photoactivity in TPD correlates with the onset of methanol diffusion along the surface’s Ti4+ rows at ~200 K. These results demonstrate that optimizing thermal processes (such as diffusion or proton transfer reactions) can be critical to maximizing photocatalytic reactivity on TiO2 surfaces. This work was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences & Biosciences. Pacific Northwest National Laboratory (PNNL) is a multiprogram national laboratory operated for DOE by Battelle under contract DEAC05-76RL01830. The research was performed using EMSL, a national scientific user facility sponsored by the Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory.

Shen, Mingmin; Acharya, Danda P.; Dohnalek, Zdenek; Henderson, Michael A.

2012-12-06T23:59:59.000Z

438

Biomimetic TiO{sub 2} photocatalysis: A model system for pyotosynthesis  

DOE Green Energy (OSTI)

Illumination of semiconductor colloids with light having energy greater than the band gap leads to the formation of electron/hold pairs. Similar to the natural photosynthetic systems, rapid recombination of photogenerated carriers is prevented by removal of one or both carriers from the semiconductor particle. Since the lifetime of charged pairs is very short, only very fast reactions with adsorbed species lead to efficient charge separation. Concurrently, surface adsorption also results in the blocking of the surface states that thermalize photogenerated charges and convert useful energy into heat. Thus, if the surface of the colloid is properly engineered the kinetics of the photochemical reactions and the redox properties of photogenerated charges in the modified colloids may be enhanced for stabilized charge separation, such as in natural photosynthesis. We have shown that adsorption of {alpha}-substituted mercapto-carboxylic acids on small particle TiO{sub 2} colloids results in the bidentate coordination of surface Ti atoms with carboxyl and mercapto groups. This complex is stabilized by the formation of a five membered ring which is the optimal configuration for octahedral coordination of Ti atoms. This surface modification of TiO{sub 2} results in the formation of a charge transfer complex that shifts the optical absorption threshold to the visible region of the spectrum (520 nm). These complexes provide more favorable absorbance properties for solar energy conversion. In this work we are applying electron paramagnetic resonance (EPR) to study the transient species formed by the reactions initiated by charge transfer or colloid photoabsorption.

Thurnauer, M.C.; Rajh, T.; Tiede, D.M.

1996-03-01T23:59:59.000Z

439

Efficient preparation of nanocrystalline anatase TiO{sub 2} and V/TiO{sub 2} thin layers using microwave drying and/or microwave calcination technique  

Science Conference Proceedings (OSTI)

This study has demonstrated that the synthesis of TiO{sub 2} and V/TiO{sub 2} thin layers may be significantly improved and extended if microwave energy is employed during the drying and/or calcination step. Thin nanoparticulate titania layers were prepared via the sol-gel method using titanium n-butoxide as a precursor. As prepared films were then analyzed by means of various characterization techniques (Raman spectroscopy, UV/Vis, AFM, XPS) in order to determine their functional properties. The photocatalytic activities of prepared layers were quantified by the decoloring rate of Rhodamine B. All thermal treatments in microwave field were done in the same manner, by using an IR pyrometer in the microwave oven and monitoring the temperature of the heating. Nevertheless the microwave and thermally prepared materials were different. This in turn may lead to differences in their functional and also photocatalytic properties. - Graphical abstract: This study has demonstrated that the synthesis of thin layers may be improved and extended if microwave energy is employed during the preparation process. Microwave processing has the potential to reduce the time, cost and energy input for the production of thin layers.

Zabova, H., E-mail: zabova@icpf.cas.c [Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, v.v.i., Rozvojova 135, 165 02 Prague 6 (Czech Republic); Sobek, J.; Cirkva, V.; Solcova, O. [Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, v.v.i., Rozvojova 135, 165 02 Prague 6 (Czech Republic); Kment, S. [Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8 (Czech Republic); Hajek, M. [Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, v.v.i., Rozvojova 135, 165 02 Prague 6 (Czech Republic)

2009-12-15T23:59:59.000Z

440

Catalytic Effect of Ti for Hydrogen Cycling in NaAlH4  

NLE Websites -- All DOE Office Websites (Extended Search)

Effect of Ti for Effect of Ti for Hydrogen Cycling in NaAlH 4 Mei-Yin Chou School of Physics Georgia Institute of Technology (DE-FG02-05ER46229) Acknowledgment: Yan Wang, Roland Stumpf Why is NaAlH 4 interesting? A viable candidate for hydrogen-storage material: High theoretical weight-percent hydrogen content of 5.55% and low cost But (before 1997) Dehydrogenation occurs at high temperature; rehydrogenation is difficult. Bogdanovic and Schwickardi, 1997 Hydrogen can be reversibly absorbed and desorbed from NaAlH 4 under moderate conditions by the addition of catalysts (compounds containing Ti, Zr, etc.) High Hydrogen Contents in Complex Hydrides Hydride wt% Hydride wt% Be(BH 4 ) 2 20.8 Mg(AlH 4 ) 2 9.3 LiBH 4 18.2 Ca(AlH 4 ) 2 7.9 Mg(BH 4 ) 2 14.9 KBH 4 7.5 Ca(BH 4 ) 2 11.6 NaAlH 4 7.5 NaBH4 10.7 Ga(AlH

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441

Growth of TiO{sub 2} Thin Film on Various Substrates using RF Magnetron Sputtering  

Science Conference Proceedings (OSTI)

The conductivity of Titanium Dioxide (TiO{sub 2}) thin film fabricated using Radio Frequency (RF) Magnetron Sputtering on Silicon (Si), Indium doped--Tin Oxide (ITO) and microscope glass (M) substrates is presented in this paper. The dependant of thin film thickness and type of substrate been discussed. TiO{sub 2} was deposited using Ti target in Ar+O{sub 2}(45:10) mixture at 250 W for 45, 60, 75, 90, 105 and 120 minute. Resultant thickness varies from 295 nm to 724 nm with deposition rate 6.4 nm/min. On the other hand, resistivity, Rs value for ITO substrate is between 5.72x10{sup -7} to 1.54x10{sup -6{Omega}}.m, Si substrate range is between 3.52x10{sup -6} to 1.76x10{sup -5{Omega}}.m and M substrate range is between 99 to 332 {Omega}.m. The value of resistivity increases with the thickness of the thin film.

Ali, Riyaz Ahmad Mohamed; Nayan, Nafarizal [Microelectronic and Nanotechnology-Shamsuddin Research Center (MiNT-SRC), Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia (UTHM), 86400 Batu Pahat, Johor D.T. (Malaysia)

2011-03-30T23:59:59.000Z

442

Electronic structure of fully epitaxial Co2TiSn thin films  

SciTech Connect

In this article we report on the properties of thin films of the full Heusler compound Co{sub 2}TiSn prepared by DC magnetron co-sputtering. Fully epitaxial, stoichiometric films were obtained by deposition on MgO (001) substrates at substrate temperatures above 600 C. The films are well ordered in the L2{sub 1} structure, and the Curie temperature exceeds slightly the bulk value. They show a significant, isotropic magnetoresistance and the resistivity becomes strongly anomalous in the paramagnetic state. The films are weakly ferrimagnetic, with nearly 1 {mu}{sub B} on the Co atoms, and a small antiparallel Ti moment, in agreement with theoretical expectations. From comparison of x-ray absorption spectra on the Co L{sub 3,2} edges, including circular and linear magnetic dichroism, with ab initio calculations of the x-ray absorption and circular dichroism spectra we infer that the electronic structure of Co{sub 2}TiSn has essentially non-localized character. Spectral features that have not been explained in detail before, are explained here in terms of the final state band structure.

Meinert, Markus; Schmalhorst, Jan; Wulfmeier, Hendrik; Reiss, Gunter; Arenholz, Elke; Graf, Tanja; Felser, Claudia

2010-10-28T23:59:59.000Z

443

Controlling internal barrier in low loss BaTiO3 supercapacitors  

E-Print Network (OSTI)

Supercapacitor behavior has been reported in a number of oxides including reduced BaTiO3 ferroelectric ceramics. These so-called giant properties are however not easily controlled. We show here that the continuous coating of individual BaTiO3 grains by a silica shell in combination with Spark Plasma Sintering is a way to process bulk composites having supercapacitor features with low dielectric losses and temperature stability. The silica shell acts both as an oxidation barrier during the processing and as a dielectric barrier in the final composite. 1 Commercial supercapacitors are using polycrystalline materials in which metallic grains or foils (like tantalum) with extended specific surface are covered by their respective oxides (like tantalum oxide). The resulting barrier layers locate electronic and ionic space charges, increasing the capacitance density. While such barrier layer supercapacitors are of everyday use, 1,2 an improved control of the interfaces barrier in such advanced materials would lead to increased functionalities: higher charge storage ability, lower losses and increased cut-off frequency. We show here that individual coating of ferroelectric BaTiO3 grains by a silica shell followed by a fast sintering in reducing conditions leads to such stable

U-c. Chung; C. Elissalde; S. Mornet; M. Maglione; C. Estournès

2009-01-01T23:59:59.000Z

444

Band gap enhancement of glancing angle deposited TiO{sub 2} nanowire array  

SciTech Connect

Vertically oriented TiO{sub 2} nanowire (NW) arrays were fabricated by glancing angle deposition technique. Field emission-scanning electron microscopy shows the formation of two different diameters {approx}80 nm and {approx}40 nm TiO{sub 2} NW for 120 and 460 rpm azimuthal rotation of the substrate. The x-ray diffraction and Raman scattering depicted the presence of rutile and anatase phase TiO{sub 2}. The overall Raman scattering intensity decreased with nanowire diameter. The role of phonon confinement in anatase and rutile peaks has been discussed. The red (7.9 cm{sup -1} of anatase E{sub g}) and blue (7.4 cm{sup -1} of rutile E{sub g}, 7.8 cm{sup -1} of rutile A{sub 1g}) shifts of Raman frequencies were observed. UV-vis absorption measurements show the main band absorption at 3.42 eV, 3.48 eV, and {approx}3.51 eV for thin film and NW prepared at 120 and 460 rpm, respectively. Three fold enhance photon absorption and intense light emission were observed for NW assembly. The photoluminescence emission from the NW assembly revealed blue shift in main band transition due to quantum confinement in NW structures.

Chinnamuthu, P.; Mondal, A.; Singh, N. K.; Dhar, J. C. [National Institute of Technology Agartala, Department of Electronics and Communication Engineering, Jirania, Tripura (West) 799055 (India); Chattopadhyay, K. K. [Jadavpur University, Department of Physics, Kolkata 700032 (India); Bhattacharya, Sekhar [SSN Research Centre, Tamil Nadu 603110 (India)

2012-09-01T23:59:59.000Z

445

Large Thermoelectric Power Factor in TiS2 Crystal with Nearly Stoichiometric Composition  

E-Print Network (OSTI)

A TiS2 crystal with a layered structure was found to have a large thermoelectric power factor. The in-plane power factor S2 /? at 300 K is 37.1 µW/K2cm with resistivity (?) of 1.7 m?cm and thermopower (S) of-251 µV/K, and this value is comparable to that of the best thermoelectric material, Bi2Te3 alloy. The electrical resistivity shows both metallic and highly anisotropic behaviors, suggesting that the electronic structure of this TiS2 crystal has a quasi-twodimensional nature. The large thermoelectric response can be ascribed to the large density of state just above the Fermi energy and inter-valley scattering. In spite of the large power factor, the figure of merit, ZT of TiS2 is 0.16 at 300 K, because of relatively large thermal conductivity, 68 mW/Kcm. However, most of this value comes from reducible lattice contribution. Thus, ZT can be improved by reducing lattice thermal conductivity, e.g., by introducing a rattling unit into the inter-layer sites.

H. Imai; Y. Shimakawa; Y. Kubo

2008-01-01T23:59:59.000Z

446

High-Temperature Galling Characteristics of Ti-6Al-4V with and without Surface Treatments  

SciTech Connect

Galling is a severe form of surface damage in metals and alloys that typically arises under relatively high normal force, low-sliding speed, and in the absence of effective lubrication. It can lead to macroscopic surface roughening and seizure. The occurrence of galling can be especially problematic in high-temperature applications like diesel engine exhaust gas recirculation system components and adjustable turbocharger vanes, because suitable lubricants may not be available, moisture desorption promotes increased adhesion, and the yield strength of metals decreases with temperature. Oxidation can counteract these effects to some extent by forming lubricative oxide films. Two methods to improve the galling resistance of titanium alloy Ti-6Al-4V were investigated: (a) applying an oxygen diffusion treatment, and (b) creating a metal-matrix composite with TiB2 using a high-intensity infrared heating source. A new, oscillating three-pin-on-flat, high-temperature test method was developed and used to characterize galling behavior relative to a cobalt-based alloy (Stellite 6B ). The magnitude of the oscillating torque, the surface roughness, and observations of surface damage were used as measures of galling resistance. Owing to the formation of lubricative oxide films, the galling resistance of the Ti-alloy at 485o C, even non-treated, was considerably better than it was at room temperature. The IR-formed composite displayed reduced surface damage and lower torque than the substrate titanium alloy.

Blau, Peter Julian [ORNL; ERDMAN III, DONALD L [ORNL; Ohriner, Evan Keith [ORNL; Jolly, Brian C [ORNL

2011-01-01T23:59:59.000Z

447

X-ray photoelectron spectroscopy characterization of the {omega} phase in water quenched Ti-5553 alloy  

SciTech Connect

X-ray photoelectron spectroscopy was used to investigate the {omega} phase in water quenched Ti-5553 alloy with a nominal composition of Ti-5Al-5V-5Mo-3Cr (wt.%), and the {omega} and the {beta} phase were distinguished by deconvoluting the XPS spectra of Al2p, V2p and Cr2p core level regions. In addition, it is found that the binding energy of core level electron of alloying elements shifts comparing with that of pure metals, and the fact was interpreted by charge redistribution model. X-ray photoelectron spectroscopy technique could be used to characterize the nano-scale {omega} phase in {beta} alloys. - Highlights: Black-Right-Pointing-Pointer We characterize the {omega} phase in Ti-5553 alloy by XPS. Black-Right-Pointing-Pointer Binding energy of Al2p, V2p and Cr2p electron are different in the {omega} and {beta} phase. Black-Right-Pointing-Pointer Structural difference leads to the binding energy gap.

Qin, Dongyang, E-mail: qindongyang19831205@126.com [State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an 710049 (China) [State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xi'an 710049 (China); Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China); Lu, Yafeng [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China)] [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China); Zhang, Kong; Liu, Qian [The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)] [The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China); Zhou, Lian [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China)] [Northwest Institute for Non-ferrous Metal Research, Xi'an 710016 (China)

2012-11-15T23:59:59.000Z

448

Ternary oxide nanostructures and methods of making same  

DOE Patents (OSTI)

A single crystalline ternary nanostructure having the formula A.sub.xB.sub.yO.sub.z, wherein x ranges from 0.25 to 24, and y ranges from 1.5 to 40, and wherein A and B are independently selected from the group consisting of Ag, Al, As, Au, B, Ba, Br, Ca, Cd, Ce, Cl, Cm, Co, Cr, Cs, Cu, Dy, Er, Eu, F, Fe, Ga, Gd, Ge, Hf, Ho, I, In, Ir, K, La, Li, Lu, Mg, Mn, Mo, Na, Nb, Nd, Ni, Os, P, Pb, Pd, Pr, Pt, Rb, Re, Rh, Ru, S, Sb, Sc, Se, Si, Sm, Sn, Sr, Ta, Tb, Tc, Te, Ti, Tl, Tm, U, V, W, Y, Yb, and Zn, wherein the nanostructure is at least 95% free of defects and/or dislocations.

Wong, Stanislaus S. (Stony Brook, NY); Park, Tae-Jin (Port Jefferson, NY)

2009-09-08T23:59:59.000Z

449

Numerical Modeling of 90Sr and 137Cs Transport from a Spill in the B-Cell of the 324 Building, Hanford Site 300 Area  

SciTech Connect

To characterize the extent of contamination under the 324 Building, a pit was excavated on the north side of the building in 2010 by Washington Closure Hanford LLC (WCH). Horizontal closed-end steel access pipes were installed under the foundation of the building from this pit and were used for measuring temperatures and exposure rates under the B-Cell. The deployed sensors measured elevated temperatures of up to 61 C (142 F) and exposure rates of up to 8,900 R/hr. WCH suspended deactivation of the facility because it recognized that building safety systems and additional characterization data might be needed for remediation of the contaminated material. The characterization work included additional field sampling, laboratory measurements, and numerical flow and transport modeling. Laboratory measurements of sediment physical, hydraulic, and geochemical properties were performed by Pacific Northwest National Laboratory (PNNL) and others. Geochemical modeling and subsurface flow and transport modeling also were performed by PNNL to evaluate the possible extent of contamination in the unsaturated sand and gravel sediments underlying the building. Historical records suggest that the concentrated 137Cs- and 90Sr-bearing liquid wastes that were spilled in B-Cell were likely from a glass-waste repository testing program associated with the Federal Republic of Germany (FRG). Incomplete estimates of the aqueous chemical composition (no anion data provided) of the FRG waste solutions were entered into a geochemical speciation model and were charge balanced with nitrate to estimate waste composition. Additional geochemical modeling was performed to evaluate reactions of the waste stream with the concrete foundation of the building prior to the stream entering the subsurface.

Rockhold, Mark L.; Bacon, Diana H.; Freedman, Vicky L.; Lindberg, Michael J.; Clayton, Ray E.

2012-03-19T23:59:59.000Z

450

Photoelectrochemical water splitting and simultaneous photoelectrocatalytic degradation of organic pollutant on highly smooth and ordered TiO{sub 2} nanotube arrays  

SciTech Connect

The photoelectrochemical water splitting and simultaneous photoelectrocatalytic degradation of organic pollutant were achieved on TiO{sub 2} nanotube electrodes with double purposes of environmental protection and renewable energy production under illumination of simulated solar light. The TiO{sub 2} nanotube arrays (TiO{sub 2} NTs) were fabricated by a two-step anodization method. The TiO{sub 2} NTs prepared in two-step anodization process (2-step TiO{sub 2} NTs) showed much better surface smoothness and tube orderliness than TiO{sub 2} NTs prepared in one-step anodization process (1-step TiO{sub 2} NTs). In the photoelectrochemical water splitting and simultaneous photoelectrocatalytic decomposition process, the 2-step TiO{sub 2} NTs electrode showed both highest photo-conversion efficiency of 1.25% and effective photodecomposition efficiency with existing of methylene blue (MB) as sacrificial agent and as pollutant target. Those results implied that the highly ordered nanostructures provided direct pathway and uniform electric field distribution for effective charges transfer, as well as superior capabilities of light harvesting. - Graphical Abstract: The photoelectrochemical water splitting for hydrogen generation and simultaneous photoelectrocatalytic degradation of organic pollutant (methylene blue) were achieved on TiO{sub 2} nanotube electrodes with double purposes of environmental protection and renewable energy production under illumination of simulated solar light. Highlights: Black-Right-Pointing-Pointer TiO{sub 2} nanotube arrays were fabricated by a two-step anodization method. Black-Right-Pointing-Pointer Hydrogen generation and organic pollutant degradation were achieved on TiO{sub 2} NTs. Black-Right-Pointing-Pointer Highest photoconversion efficiency of 1.25% was achieved. Black-Right-Pointing-Pointer Increasing orderliness will increase photocatalytic activity of TiO{sub 2} NTs.

Wu Hongjun [College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318 (China); Institute of Basic Energy Science and Technology, George Washington University, VA 20147 (United States); Zhang Zhonghai, E-mail: zhonghaizhangwill@gmail.com [Institute of Basic Energy Science and Technology, George Washington University, VA 20147 (United States); Graduate School of Science and Engineering for Research, University of Toyama, 3190 Gofuku, Toyama 930-8555 (Japan)

2011-12-15T23:59:59.000Z

451

The PACS-CS Project  

E-Print Network (OSTI)

We describe our plan to develop a large-scale cluster system with a peak speed of 14.3Tflops for lattice QCD at the Center for Computational Sciences, University of Tsukuba, as a successor to the current 0.6Tflops CP-PACS computer. The system consist of 2560 nodes connected by a 16x16x10 three-dimensional hyper crossbar network. Each node has a single low-voltage 2.8GHz Xeon processor and 2GBytes of memory with 6.4GBytes/sec bandwidth, and 160 GBytes of disk in RAID1 mode. The network link in each of the three directions is made of dual Gigabit Ethernet with the peak throughput of 250MByte/sec. Hence each node has an aggregate network bandwidth of 750MByte/sec. The system will run under Linux and SCore, and an extension of the PM driver is developed for the network. The system will be developed jointly with Hitachi Limited. The installation is scheduled in the first quarter of Japanese Fiscal 2006 (April-June 2006) and the start of operation is expected in July 2006.

PACS-CS Collaboration; :; S. Aoki; K. -I. Ishikawa; T. Ishikawa; N. Ishizuka; K. Kanaya; Y. Kuramashi; M. Okawa; K. Sasaki; Y. Taniguchi; N. Tsutsui; A. Ukawa; T. Yoshie

2005-10-02T23:59:59.000Z

452

CS 535- Wireless Network Security  

E-Print Network (OSTI)

This is a 3-credit course that focuses on security and privacy issues in wireless networks and systems. Generally the security of MAC and especially upper layers are considered in this class. This course is not intended to cover cryptography in detail, but an overview of cryptography will be given at the beginning of the course so that the students who do not know cryptography would have sufficient information to understand the rest of the course. Although the catalogue information for this course (see below) several sub areas of wireless network security, in this course we will focus on ad hoc and sensor network security. Catalogue Data: This course covers security and privacy issues in wireless networks and systems, such as cellular networks, wireless LANs, wireless PANs, mobile ad hoc networks, vehicular networks, satellite networks, wireless mesh networks, sensor networks and RFID systems. Security problems of MAC and especially upper layers will be emphasized. Attacks and proposed solutions at several layers, authentication, key distribution and key management, secure routing, selfish and malicious behaviors, and secure group communication are analyzed for applicable wireless network types. A short overview of cryptography and wireless networking principles will be given at the beginning of the course. Prerequisite: Formally there is no prerequisite for this course, but students are expected to come with undergrad level computer networks background. Moreover, computer-programming expertise is necessary. Instructor: Schedule:

Albert Levi

2008-01-01T23:59:59.000Z

453

Synthesis and characterization of nano-structured TiB{sub 2} processed by milling assisted SHS route  

Science Conference Proceedings (OSTI)

TiB{sub 2} was synthesized via milling assisted self-propagating high-temperature synthesis (SHS) route using TiO{sub 2}, H{sub 3}BO{sub 3} and Mg powders as starting materials. The milling products were compacted and subjected to a hot filament on their top to initiate SHS. Effects of the milling time and addition of NaCl as a process diluent on the phase composition and morphology of the products were investigated. X-ray diffraction analysis indicated the formation of nano-crystalline TiB{sub 2} with mean crystallite size of 31 nm after acid leaching process at room temperature. Addition of 2 mol of NaCl in the same sample decreases the mean crystallite size to 27 nm. SEM and TEM micrographs showed that the mean particle size of TiB{sub 2} decreased from 200 nm in the un-milled sample to about 50 nm in the 5-hour mechanically activated (MA) sample. - Graphical abstract: High purity nano particles of TiB{sub 2} were achieved after complete elimination of undesirable phases by acid leaching of MA-SHS product at ambient temperature. Highlights: Black-Right-Pointing-Pointer Nano-structured pure TiB{sub 2} was synthesized by MA-SHS route. Black-Right-Pointing-Pointer The mean particle size of TiB{sub 2} phase was 50 nm. Black-Right-Pointing-Pointer Impurities were eliminated by leaching of the products at ambient temperature.

Nozari, A.; Ataie, A., E-mail: aataie@ut.ac.ir; Heshmati-Manesh, S.

2012-11-15T23:59:59.000Z

454

Microsoft PowerPoint - IPRC 2012 oral presentation CEA E Mendes...  

NLE Websites -- All DOE Office Websites (Extended Search)

450-500 C Precipitation Conversion 700 C ZrF 4 An PF An Cs, Rb Distillation Used Fuel Zn Digestion 830 C Platinodes Metallic waste Distillation LiF-AlF 3...

455

DEVELOPMENT OF CRYSTALLINE CERAMICS FOR IMMOBILIZATION OF ADVANCED FUEL CYCLE REPROCESSING WASTES  

Science Conference Proceedings (OSTI)

The Savannah River National Laboratory (SRNL) is developing crystalline ceramic waste forms to incorporate CS/LN/TM high Mo waste streams consisting of perovskite, hollandite, pyrochlore, zirconolite, and powellite phase assemblages. Simple raw materials, including Al{sub 2}O{sub 3}, CaO, and TiO{sub 2} were combined with simulated waste components to produce multiphase crystalline ceramics. Fiscal Year 2011 (FY11) activities included (i) expanding the compositional range by varying waste loading and fabrication of compositions rich in TiO{sub 2}, (ii) exploring the processing parameters of ceramics produced by the melt and crystallize process, (iii) synthesis and characterization of select individual phases of powellite and hollandite that are the target hosts for radionuclides of Mo, Cs, and Rb, and (iv) evaluating the durability and radiation stability of single and multi-phase ceramic waste forms. Two fabrication methods, including melting and crystallizing, and pressing and sintering, were used with the intent of studying phase evolution under various sintering conditions. An analysis of the XRD and SEM/EDS results indicates that the targeted crystalline phases of the FY11 compositions consisting of pyrochlore, perovskite, hollandite, zirconolite, and powellite were formed by both press and sinter and melt and crystallize processing methods. An evaluation of crystalline phase formation versus melt processing conditions revealed that hollandite, perovskite, zirconolite, and residual TiO{sub 2} phases formed regardless of cooling rate, demonstrating the robust nature of this process for crystalline phase development. The multiphase ceramic composition CSLNTM-06 demonstrated good resistance to proton beam irradiation. Electron irradiation studies on the single phase CaMoO{sub 4} (a component of the multiphase waste form) suggested that this material exhibits stability to 1000 years at anticipated self-irradiation doses (2 x 10{sup 10}-2 x 10{sup 11} Gy), but that its stability may be rate dependent, therefore limiting the activity of the waste for which it can be employed. Overall, these preliminary results indicate good radiation damage tolerance for the crystalline ceramic materials. The PCT results showed that, for all of the waste forms tested, the normalized release values for most of the elements measured, including all of the lanthanides and noble metals, were either very small or below the instrument detection limits. Elevated normalized release values were measured only for Cs, Mo, and Rb. It is difficult to draw further conclusions from these data until a benchmark material is developed for the PCT with this type of waste form. Calcined, simulated CS/LN/TM High Mo waste without additives had relatively low normalized release values for Cs, Mo, and Rb. A review of the chemical composition data for this sample showed that these elements were well retained after the calcination. Therefore, it will be useful to further characterize the calcined material to determine what form these elements are in after calcining. This, along with single phase studies on Cs containing crystal structures such as hollandite, should provide insight into the most ideal phases to incorporate these elements to produce a durable waste form.

Fox, K.; Brinkman, K.

2011-09-22T23:59:59.000Z

456

Computer simulation of the energy gap in ZnO- and TiO{sub 2}-based semiconductor photocatalysts  

SciTech Connect

Ab initio calculations of the electronic structures of binary ZnO- and TiO{sub 2}-based oxides are performed to search for optimum dopants for efficient absorption of the visible part of solar radiation. Light elements B, C, and N are chosen for anion substitution. Cation substitution is simulated by 3d elements (Cr, Mn, Fe, Co) and heavy metals (Sn, Sb, Pb, Bi). The electronic structures are calculated by the full-potential linearized augmented plane wave method using the modified Becke-Johnson exchange-correlation potential. Doping is simulated by calculating supercells Zn{sub 15}D{sub 1}O{sub 16}, Zn{sub 16}O{sub 15}D{sub 1}, Ti{sub 15}D{sub 1}O{sub 32}, and Ti{sub 8}O{sub 15}D{sub 1}, where one-sixteenth of the metal (Ti, Zn) or oxygen atoms is replaced by dopant atoms. Carbon and antimony are found to be most effective dopants for ZnO: they form an energy gap {Delta}E = 1.78 and 1.67 eV, respectively. For TiO{sub 2}, nitrogen is the most effective dopant ({Delta}E = 1.76 eV).

Skorikov, N. A., E-mail: nskorikov@gmail.com; Korotin, M. A.; Kurmaev, E. Z. [Russian Academy of Sciences, Institute of Metal Physics, Ural Branch (Russian Federation); Cholakh, S. O. [Ural Federal University (Russian Federation)

2012-12-15T23:59:59.000Z

457

NA-42 TI Shared Software Component Library FY2011 Final Report  

SciTech Connect

The NA-42 TI program initiated an effort in FY2010 to standardize its software development efforts with the long term goal of migrating toward a software management approach that will allow for the sharing and reuse of code developed within the TI program, improve integration, ensure a level of software documentation, and reduce development costs. The Pacific Northwest National Laboratory (PNNL) has been tasked with two activities that support this mission. PNNL has been tasked with the identification, selection, and implementation of a Shared Software Component Library. The intent of the library is to provide a common repository that is accessible by all authorized NA-42 software development teams. The repository facilitates software reuse through a searchable and easy to use web based interface. As software is submitted to the repository, the component registration process captures meta-data and provides version control for compiled libraries, documentation, and source code. This meta-data is then available for retrieval and review as part of library search results. In FY2010, PNNL and staff from the Remote Sensing Laboratory (RSL) teamed up to develop a software application with the goal of replacing the aging Aerial Measuring System (AMS). The application under development includes an Advanced Visualization and Integration of Data (AVID) framework and associated AMS modules. Throughout development, PNNL and RSL have utilized a common AMS code repository for collaborative code development. The AMS repository is hosted by PNNL, is restricted to the project development team, is accessed via two different geographic locations and continues to be used. The knowledge gained from the collaboration and hosting of this repository in conjunction with PNNL software development and systems engineering capabilities were used in the selection of a package to be used in the implementation of the software component library on behalf of NA-42 TI. The second task managed by PNNL is the development and continued maintenance of the NA-42 TI Software Development Questionnaire. This questionnaire is intended to help software development teams working under NA-42 TI in documenting their development activities. When sufficiently completed, the questionnaire illustrates that the software development activities recorded incorporate significant aspects of the software engineering lifecycle. The questionnaire template is updated as comments are received from NA-42 and/or its development teams and revised versions distributed to those using the questionnaire. PNNL also maintains a list of questionnaire recipients. The blank questionnaire template, the AVID and AMS software being developed, and the completed AVID AMS specific questionnaire are being used as the initial content to be established in the TI Component Library. This report summarizes the approach taken to identify requirements, search for and evaluate technologies, and the approach taken for installation of the software needed to host the component library. Additionally, it defines the process by which users request access for the contribution and retrieval of library content.

Knudson, Christa K.; Rutz, Frederick C.; Dorow, Kevin E.

2011-07-21T23:59:59.000Z

458

Photocatalytic degradation of atrazine using TiO{sub 2}-impregnated mesh  

SciTech Connect

TiO{sub 2} photocatalysis is investigated is a potential means for the disposal of pesticide rinsate waste at agrochemical dealerships. The focus is an evaluation of parameters that affect the rate and mechanism of atrazine degradation using formulated atrazine (ca. 20-25 ppm), TiO{sub 2} mesh, a high-pressure mercury-vapor lamp, and solar irradiation. The UV transmission of a variety of transparent materials was measured and atrazine photocatalysis was carried out using several materials as reactor covers. The pseudo-first-order rate constants were calculated and compared to determine which cover results in the most efficient atrazine degradation. A clear acrylic gave results nearly identical to Pyrex and was chosen for future photocatalytic experiments. UV intensity and photocatalytic rate were studied as a function of different numbers of layers of TiO{sub 2} mesh. It was found that five layers give the optimum rate of degradation without employing excess mesh. In order to assess the general effect of impurities present in water on the rate of atrazine degradation, water from five different sources was obtained and each sample was analyzed for purity and used to prepare aqueous atrazine for photocatalytic degradation. The results show that contaminants specific to different locations are likely to inhibit the rate of photocatalysis to different degrees. While working to maximize the rate of atrazine degradation, studies are concurrently in progress to elucidate the mechanism of degradation for the experimental conditions employed herein. Initial results indicate that the overall degradation of atrazine to the reported end product, cyanuric acid, occurs by two distinct pathways of similar importance.

Kiserow, D.J.; Pugh, K.C.

1994-10-01T23:59:59.000Z

459

Microstructure evolution in TiN films reactively sputter deposited on multiphase substrates  

SciTech Connect

Cross-sectional transmission electron microscopy (X-TEM) has been used to investigate the microstructure of TiN films deposited by reactive magnetron sputtering onto ASP 30 high speed steel (HSS) substrates. ASP 30 is a multiphase material consisting of a martensitic matrix with MC and M/sub 6/C transition--metal particles embedded in it. The TiN films were approx.4 ..mu..m thick and were grown at substrate temperatures T/sub s/ between 200 and 550/sup 0/C. The X-TEM results showed that the film microstructure was very nonhomogeneous. A dense columnar morphology was observed above both the martensitic and M/sub 6/C substrate phases. The average column diameter ranged from 15 nm (T/sub s/ = 200/sup 0/C) to 50 nm (T/sub s/ = 550/sup 0/C) near the film/substrate interface over the martensitic phase and was in a factor of 2 less in the film regions adjacent to the M/sub 6/C phase. increased in both regions to 100 nm (T/sub s/ = 200/sup 0/C) to 150 nm (T/sub s/ = 550/sup 0/C) near the surface of the films. TiN grew epitaxially on MC particles but contained a high dislocation density which (except at 550/sup 0/C where some of the epitaxial grains extended throughout the entire film thickness) eventually coalesced to form low-angle grain boundaries and, finally, high-angle boundaries.

Helmersson, U.; Sundgren, J.; Greene, J.E.

1986-05-01T23:59:59.000Z

460

Continuous production of granular or powder Ti, Zr and Hf or their alloy products  

DOE Patents (OSTI)

A continuous process for producing a granular metal selected from the group consisting of Ti, Zr or Hf under conditions that provide orderly growth of the metal free of halide inclusions comprising: a) dissolving a reducing metal selected from the group consisting of Na, Mg, Li or K in their respective halide salts to produce a reducing molten salt stream; b) preparing a second molten salt stream containing the halide salt of Ti, Zr or Hf; c) mixing and reacting the two molten streams of steps a) and b) in a continuous stirred tank reactor; d) wherein steps a) through c) are conducted at a temperature range of from about 800.degree. C. to about 1100.degree. C. so that a weight percent of equilibrium solubility of the reducing metal in its respective halide salt varies from about 1.6 weight percent at about 900.degree. C. to about 14.4 weight percent at about 1062.degree. C.; and wherein a range of concentration of the halide salt of Ti, Zn or Hf in molten halides of Na, Mg, Li or K is from about 1 to about 5 times the concentration of Na, Mg, Li or K; e) placing the reacted molten stream from step c) in a solid-liquid separator to recover an impure granular metal product by decantation, centrifugation, or filtration; and f) removing residual halide salt impurity by vacuum evaporator or inert gas sweep at temperatures from about 850.degree. C. to 1000.degree. C. or cooling the impure granular metal product to ambient temperature and water leaching off the residual metal halide salt.

White, Jack C. (Albany, OR); Oden, Laurance L. (Albany, OR)

1993-01-01T23:59:59.000Z

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461

Ferromagnetism in Co-doped (La,Sr)TiO3  

SciTech Connect

The origin of ferromagnetism in Co-doped (La,Sr)TiO{sub 3} epitaxial thin films is discussed. While the as-grown samples are not ferromagnetic at room temperature or at 10 K, ferromagnetism at room temperature appears after annealing the films in reducing conditions and disappears after annealing in oxidizing conditions. Magnetic measurements, x-ray absorption spectroscopy, x-ray photoemission spectroscopy and transmission electron microscopy experiments indicate that within the resolution of the instruments the activation of the ferromagnetism is not due to the presence of pure Co.

Fix, T.; Liberati, M.; Aubriet, H.; Sahonta, S.-L.; Bali, R.; Becker, C.; Ruch, D.; MacManus-Driscoll, J.L.; Arenholz, E.; Blamire, M.G.

2009-04-21T23:59:59.000Z

462

Controlling Atomic Layer Deposition of TiO2 in Aerogels through Surface Functionalization  

DOE Green Energy (OSTI)

This report demonstrates a chemical functionalization method for controlling atomic layer deposition (ALD) of TiO{sub 2} in low-density nanoporous materials. Functionalization of silica aerogel with trimethylsilane is shown to strongly suppress TiO{sub 2} growth via ALD. Subsequent modification of the functionalization through selective removal of the hydrocarbon groups reactivates the aerogel towards TiO{sub 2} deposition. These results demonstrate the potential use of ALD as a selective tool for creating novel nanoporous materials. Nanoporous materials present significant technological advantage for a wide range of applications, including catalysis, energy storage and conversion, nanoelectronics to name just a few (1-4). Hence, there is considerable interest in developing synthetic pathways for the fabrication of nanoporous materials with tailored properties. Aerogels (AGs) are unique low-density, open-cell porous materials consisting of submicrometer pores and ligaments that can be used as a robust material platform for designing novel nanoporous materials. In recent years, a synthetic approach based on ALD on AG templates has emerged as a promising method for the directed growt