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1

U.S. DEPARTMENT OF I!NI!RGY EERE PROJECT MANAGEMENT CENTER NFPA DETTIUlIINATION  

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

I!NI!RGY I!NI!RGY EERE PROJECT MANAGEMENT CENTER NFPA DETTIUlIINATION RECIPIENT:Magelian Midstream Partners. LP (SEP Sub-recipient of the Iowa Office of Energy STATE: IA Independence) PROJECf TITLE: Magellan Des Moines Biodiesel Terminal Project Page 10f3 Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number CID Number DE FDA 000052 OE-EE-OOOO162 GFQ-OOOO162-016 EE162 Based on my review orlbe information concerning tbe proposed action, as NEPA Compliance Officer (authorl7.ed under DOE Order 451.JA), I have made the following determination: ex, EA, ~:IS APPI<:NDIX AND NUMBER: Description: 85.1 Actions to oonserve energy, demonstrate potential energy conservation, and promote energy-efficiency that do not increase the indoor concentrations of potentially harmful substances. These actions may involve financial and techmcal

2

U.S. DEP_~TIVffNT OFl1N1!RGY EERE PROJECT MANAGEMENT CENTER  

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

DEP_~TIVffNT OFl1N1!RGY DEP_~TIVffNT OFl1N1!RGY EERE PROJECT MANAGEMENT CENTER NliPA DI!Tl!RMINATION RECIPIENT: UALR Nanotechnology Center PROJECT TITLE: Nanostructred Solar Cells Page 1 of2 STATE: AR Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number em Number FY 2010 COP DE-FG36-06G086072 GF0-06-067b G066702 Based on my review onbe information conce.-niog the propoud action, as NEPA Compliance OWletr (authori7.ed under DOE Order45I.1A), I hJl\'c made the following determination: ex, EA, EIS APPENDIX AND NUMBER: Description: 83.6 Siting, oonstrudion (or modification), operation, and decommissioning of facilities for indoor bench-scale research projects and oonventionallaboratory operations (for example, preparation of chemical standards and sample analysis):

3

BUDGET DETAILS BOOK FOUR DPRMN OF N RGY U.S. Department of Energy  

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

BUDGET DETAILS BUDGET DETAILS BOOK FOUR DPRMN OF N RGY U.S. Department of Energy Transition Team Budget Book Office of the Chief Financial Officer Office of Budget 1. Budget Overview 2. Funding Tables and Charts 3. Appropriations Subcommittees 4. Program Overviews 5. Major Construction Projects, Activities, and Initiatives 6. Laboratory and State Data Acronyms commonly used in budget documents. ACI American Competitiveness Initiative AEI Advanced Energy Initiative AFP Approved Funding Program (monthly financial plan that dictates how funding is to be executed) AlP Accelerator Improvement Project Ames Ames National Laboratory ANL Argonne National Laboratory B&R Budget and Reference Code BA Budget Authority BAPL Bettis Atomic Power Laboratory BNL Brookhaven National Laboratory BO Budget Outlay

4

Vi Rapp  

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

Vi Rapp Vi Rapp Vi Rapp Residential Building Systems Group Lawrence Berkeley National Laboratory 1 Cyclotron Road MS 90R3074 Berkeley CA 94720 Office Location: 90-3080 (510) 495-2035 VHRapp@lbl.gov This publications database is an ongoing project, and not all Division publications are represented here yet. Publications 2013 Rapp, Vi H., Albert Pastor-Perez, Brett C. Singer, and Craig P. Wray. Predicting Backdrafting and Spillage for Natural-Draft Gas Combustion Appliances: Validating VENT-II., 2013. Download: PDF (836.92 KB) 2012 Rapp, Vi H., Brett C. Singer, J. Chris Stratton, and Craig P. Wray. Assessment of Literature Related to Combustion Appliance Venting Systems., 2012. Download: PDF (1.78 MB) Rapp, Vi H., A. DeFilippo, and Samveg Saxena. "Extending the lean operating

5

U.S DEPARTMENT OFl!NllRGY EERE PROJ ECT MANAG EMENT CENTER NEPA D:E=llNATION  

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

S DEPARTMENT OFl!NllRGY S DEPARTMENT OFl!NllRGY EERE PROJ ECT MANAG EMENT CENTER NEPA D:E=llNATION R[CIPIENT: Scientific Solutions, Inc. STATE: NH PROJECf TITLE: Underwater Active Acoustic Monitoring Network for Marine and Hydrokinetic Energy Projects FUnding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number elD Number DE· FQA'{)()()293 DE-EEOOO3639 GF()'{)()()3639-002 G03639 Based on my review ofthe Information concerning the proposed aelion,.1.5 NEPA Compliance Officer (authorized under DOE Order 451.1A), I have made the following determination: ex, EA, EIS APPENDIX AND NUMBER: Description: B3.3 Research related to Field and laboratory research, inventory, and information collection activities that are directly conservation of fi sh, wildlife, related to the conservation of fish and wildlife resources or to the protection of cultural

6

DFPARThIFNT OFENJ!RGY EERE PROJECT MANAGEMENT CENTER NEPA DETER1>llNATION  

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

DFPARThIFNT OFENJ!RGY DFPARThIFNT OFENJ!RGY EERE PROJECT MANAGEMENT CENTER NEPA DETER1>llNATION Page I of3 RECIPIENT :Oklahoma State University - New Product Development Center ST ATE: OK PROJEL. TITLE; Manufacturing Improvement Program for the Oil and Gas Industry Supply Chain Funding Opportunity Announcement Number JIAC2012AM Procurement Instrument Number DE-EE0006029 NKPA Control Number GFO-OOO6029-001 CID Number G06029 Based on my review ofthe information concerning the proposed action, as NEPA Compliance Officer (authorized under DOE O rder 451.IA), I have made the following determination : CX, EA, EIS APPENDIX AND NUMBER : Description: A9 Information gathering, analysis, and dissemination A11 Technical advice and assistance to organizations Information gathering (including, but not limited to, literature surveys, inventories, site visits, and

7

U.S. DEPARTMENT OF ENl'RGY EERE PROJECT MANAGEMENT CENTER NFPA DFIFIU.llNATION  

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

ENl'RGY ENl'RGY EERE PROJECT MANAGEMENT CENTER NFPA DFIFIU.llNATION RECIPIENT: Unlverslty of Maine at Presque Isle PROJECT TITLE: Solar Energy for the North Page I of2 STATE: ME Funding Opportunity Announcement Number FY 2010 COP Procurt'mcnt Instrument Number EEOOO3185 NEPA Control Number cm Number GFO-OO03185-OO1 EE3185 Based on my rt'yiew oftbe information concerning tbe proposed action, as NEPA Compliance Officer (authorized under DOE Order 4SI.lA), I baye made the following determination: C X, EA, EIS APPENDIX AND NUMBER: Description: A9 Information gathering (including, but not limited to, literature surveys, inventories, audits), data analysis (including computer modeling), document preparation (such as conceptual design or feasibility studies, analytical energy supply

8

US. DEPARThIENI OFI!Nl!RGY EERE PROJECT MANAGEMDH CENTER NEPA DI!TI!RMINATION  

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

DEPARThIENI OFI!Nl!RGY DEPARThIENI OFI!Nl!RGY EERE PROJECT MANAGEMDH CENTER NEPA DI!TI!RMINATION Page I of2 RECIPIENT: Board of Trustees of the Leland Stanford Junior University STATE: CA PROJECr TlTl.E : PVMI Bay Area Photovoltaic Consortium Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number elD Numbn OE-FOA-000259, PV DE-EEOOO4946 GFO-OO4946-004 G04946 Based on my review ofthe information concerning the proposed action, as NEPA Compliance Officer (authorb,cd under DO": Order451.1A), I bave made the following determination: ex, EA, [IS APPENDIX AND NUMBER: Description: A9 Information gathering, analysis, and dissemination 83.15 Small-scale Indoor research and development projects using nanoscale materials Information gathering (including, but not limited to, literature surveys, inventories, site visits, and

9

US DEPARTMENT OF ENJ!RGY EERE PROJECT MANAGEMENT CENTER NFPA DF1'EIU.llNATION  

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

ENJ!RGY ENJ!RGY EERE PROJECT MANAGEMENT CENTER NFPA DF1'EIU.llNATION Page 1 of2 RECIPIENT:Ben Franklin Technology Partners STATE: PA PROJECf TITLE: Altemative and Clean Energy Technology Development and Commercialization Initiative Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number CID Number DE-EEOOO1967 GF0-0001967 -001 NT1967 Based on my review orlhe informalion concerning the proposed action,.s NEPA Compliance Officer (authorized under DOE Order 451.IA), I have made the following determination: ex, EA, EIS APP .. : NDIX AND NUMBER : Description: 83.6 Small-scale research and development, labo rat ory operations, and pilot projects Rational for detennination: Siting, construction. modification, operation, and decommissioning of facilities for smallscale research

10

u.s. DEPARTMENT OF ENl!RGY EERE PROJECT MANAGEMENT CENTER NEPA DFTEIu.llNATION  

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

ENl!RGY ENl!RGY EERE PROJECT MANAGEMENT CENTER NEPA DFTEIu.llNATION RECIPIENT:Oklahoma Department of Commerce PROJECT TITL.E: DE EE 0000922 Warr Aetes Ground Source Heat Project w/HVAC retrofit Page 1 of2 STATE : OK Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number em Number DE FDA 0000013 DE EE 0000922 0 Based on my review orlh" information concerning (he proposed action, as NEPA Compliance Officer (authorized under DOE Order 4Sl.lA), I have made the following determination: ex, EA, EIS APPENDIX AND NUMBER: Description: 85.1 Actions to conserve energy, demonstrate potential energy conservation, and promote energy-efficiency thaI do not increase the indoor concentrations of potentially harmful substances. These actions may involve financial and technical

11

DEPARTMENT OFENl!RGY EERE PROJECT MANAGEMENT CENTER Nl!PA DETl!lU.nNATION  

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

OFENl!RGY OFENl!RGY EERE PROJECT MANAGEMENT CENTER Nl!PA DETl!lU.nNATION RECIPIENT:Atargis Energy Inc. PROJECT TITLE : Cycloidal Wave Energy Converter Page lof2 STATE: CO Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number elD Number DE·FOA-OOOO293 DE-EEOOO3635 GFQ-000363S-001 0 Based on my review of tbe information concerning tbe proposed action, as NEPA Compliance Officer (authorized under DOE Order 451.IA). I have made the following determination: ex, EA, EIS APPENDIX AND NUMBER: Description: A9 Information gathering (including, bul not limited to, literature surveys, inventories, audits), data analysis (including computer modeling), document preparation (such as conceptual design or feasibility studies. analytical energy supply

12

s1, s2, . . . , sN vi = ai, i = i/vi, i = i/vi,  

E-Print Network [OSTI]

¹ ¹ vi = ai, i = i/vi, i = i/vi, xi = vi cos i cos i yi = vi sin i zi = vi cos i sin i amin ai(t) amax(t) i¹ ´ µ amin amax¸ max max ¹ º º þ º ¹ i¹ xri = xi + xdi cos i cos i - ydi cos i - zdi sin i cos i]T ¸ Ni i¹ ¸ rd R3 ¸ ¹ ¸ k > 0 º þ ¿ º º ý þ ¹ ¹ º º ¹ ¹ º ½ ? ? ? º¸ ? Ý???¹ ???? ?º ??Ð? ?? ?Ý?? ?? Ð

Granichin, Oleg

13

H + CD4 Abstraction Reaction Dynamics: Product Energy Partitioning Wenfang Hu, Gyo1rgy Lendvay, Diego Troya,# George C. Schatz,*, Jon P. Camden,|  

E-Print Network [OSTI]

H + CD4 Abstraction Reaction Dynamics: Product Energy Partitioning Wenfang Hu, Gyo1rgy LendvayVember 12, 2005 This paper presents experimental and theoretical studies of the product energy partitioning of the energy appears in product translation at energies just above the reactive threshold; however, HD

Zare, Richard N.

14

U.S. DEPARTMENT OF ENl!RGY EERE PROJECT MANAGEMENT CENTER Nl!PA DETl!R1.llNATION  

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

ENl!RGY ENl!RGY EERE PROJECT MANAGEMENT CENTER Nl!PA DETl!R1.llNATION RECIPIENT: Magma Energy (U.S .) Corp. Page 1 of3 STATE: NV PROJECf TITLE: Recovery Act: A 3D·3C Reflection Seismic Survey and Data Integration to Identify the Seismic Response of Fractures and Permeable Zones over a Known Geothermal Resource: Soda lake , Churchill Co" NV Funding Opportunity Announcement Number PrO(u.-ement Instrument Number NEPA Control Number em Number 0000109 DE-EEOOO2832 GFO-OOO2832·003 0 Based on my review oftbe informatioD concerning the proposed action, as NEPA Compliance Officer (authori7.ed under DOE Order 451.IA), I have made the following determination: ex, EA, [IS APPENDIX AND NUMBER: Description: A9 Information gathenng (including , but nollimiled 10, literature surveys, inventories, audits), data analYSIS (including

15

Flyer, Title VI  

Broader source: Energy.gov [DOE]

Titles VI and IX of the Civil Rights Act of 1964, as amended prohibit discrimination in programs and activities receiving Federal financial assistance.

16

VI-1 TALKS PRESENTED  

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

R. Rapp, EMMI Rapid Reaction Task Force on "Direct-Photon Flow Puzzle", GSI, Darmstadt, Germany (February 2014). VI-7 Quarkonia in the quark-gluon plasma, R. Rapp, Invited...

17

Energy for the future with Ris from nuclear power to sustainable energy Ris NatioNal laboRatoRy foR sustaiNable eNeRgy  

E-Print Network [OSTI]

Energy for the future ­ with Risø from nuclear power to sustainable energy Risø NatioNal laboRatoRy foR sustaiNable eNeRgy edited by MoRteN JastRup #12;Energy for the future #12;Energy for the future ­ with Risø from nuclear power to sustainable energy Translated from 'Energi til fremtiden ­ med Risø fra

18

Title VI | Department of Energy  

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

VI VI Title VI Title VI of the Civil Rights Act of 1964 prohibits discrimination on the basis of race, color, and national origin in programs and activities that receive federal financial assistance. The law states, in part, that: No person in the United States shall, on the ground of race, color, or national origin, be excluded from participation in, be denied the benefits of, or be subjected to discrimination under any program or activity receiving Federal financial assistance. The Office of Civil Rights is responsible for monitoring and enforcing compliance with Title VI, investigating Title VI-related complaints, and providing technical assistance to recipients of Department of Energy financial assistance. The Department has promulgated regulations that

19

VI Classic Green and Poisson Functions 213 VI.1Problems in Half-Space . . . . . . . . . . . . . . . . . . . . . . . .*  

E-Print Network [OSTI]

Contents VI Classic Green and Poisson Functions 213 VI.2Green Function for the Heat Equation . . . . . . . . . . . . . .* * . . 220 VI.1.3The Case #12; Chapter VI Classic Green and Poisson Functions In Chapter IV we gave a definition

Menaldi, Jose-Luis

20

LABORATORY VI ELECTRICITY FROM MAGNETISM  

E-Print Network [OSTI]

LABORATORY VI ELECTRICITY FROM MAGNETISM Lab VI - 1 In the previous problems you explored by electric currents. This lab will carry that investigation one step further, determining how changing magnetic fields can give rise to electric currents. This is the effect that allows the generation

Minnesota, University of

Note: This page contains sample records for the topic "vi rgi ni" 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

LABORATORY VI ELECTRICITY FROM MAGNETISM  

E-Print Network [OSTI]

LABORATORY VI ELECTRICITY FROM MAGNETISM Lab VI - 1 In the previous problems you explored the magnetic field and its effect on moving charges. You also saw how electric currents could create magnetic can give rise to electric currents. This is the effect that allows the generation of electricity

Minnesota, University of

22

Microbial Reduction of Intragrain U(VI) in Contaminated Sediment...  

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

Intragrain U(VI) in Contaminated Sediment. Microbial Reduction of Intragrain U(VI) in Contaminated Sediment. Abstract: The accessibility of precipitated, intragrain U(VI) in a...

23

Vi har fet et Det flles kursus har  

E-Print Network [OSTI]

offentlige tilskud. Det stiller krav til at vi laver modeller, der er mere dynamiske end vi er vant til inden

24

The Radiolysis of AmVI Solutions  

SciTech Connect (OSTI)

The reduction of bismuthate-produced AmVI by 60Co gamma-rays was measured using post-irradiation UV/Vis spectroscopy. The reduction of AmVI by radiolysis was rapid, producing AmV as the sole product. Relatively low absorbed doses in the ~0.3 kGy range quantitatively reduced a solution of 2.5 x 10-4 M AmVI. The addition of bismuthate to samples during irradiation did not appear to protect AmVI from radiolytic reduction during these experiments. It was also shown here that AmV is very stable toward radiation. The quantitative reduction of the AmVI concentration here corresponds to 1.4 hours of exposure to a process solution, however the actual americium concentrations will be higher and the expected contact times short when using centrifugal contactors. Thus, the reduction rate found in these initial experiments may not be excessive.

Bruce J. Mincher

2013-06-01T23:59:59.000Z

25

Determining Individual Mineral Contributions To U(VI) Adsorption...  

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

Individual Mineral Contributions To U(VI) Adsorption In A Contaminated Aquifer Sediment: A Fluorescence Spectroscopy Determining Individual Mineral Contributions To U(VI)...

26

Molecular Interactions of Plutonium(VI) with SyntheticManganese...  

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

Plutonium(VI) with Synthetic Manganese-Substituted Goethite. Abstract: Plutonium(VI) sorption on the surface of well-characterized synthetic manganese-substituted goethite...

27

Blue Canyon VI | Open Energy Information  

Open Energy Info (EERE)

VI VI Jump to: navigation, search Name Blue Canyon VI Facility Blue Canyon VI Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner EDP Renewables North America LLC Developer EDP Renewables North America LLC Energy Purchaser Merchant Location Lawton OK Coordinates 34.8582°, -98.54752° 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":34.8582,"lon":-98.54752,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

28

DarkStar VI | Open Energy Information  

Open Energy Info (EERE)

DarkStar VI DarkStar VI Jump to: navigation, search Name DarkStar VI Place Collinsville, Illinois Zip 62234-2022 Sector Services Product Manufacturer of biodiesel processing equipment and supplier of accessories, information and services. Coordinates 36.720014°, -79.91284° 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":36.720014,"lon":-79.91284,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

29

VI. References V. Realistic Learning (Rate Based  

E-Print Network [OSTI]

VI. References V. Realistic Learning (Rate Based III. Mean Field Model IV. Spike Timing Depended Results Batch Learning ber of pattern stored patterns Low pass filtering: Presynaptic Adaptation ( ):see Christian Albers and Klaus Pawelzik University of Bremen -- Institute for Theoretical Physics -- Department

Kreiter, Andreas K.

30

ENDF-201, ENDF/B-VI summary documentation supplement 1, ENDF/HE-VI summary documentation  

SciTech Connect (OSTI)

The National Nuclear Data Center (NNDC) provides coordination for and serves as the secretariat to the Cross Section Evaluation Working Group (CSWEG). CSEWG is responsible for the oversight of the ENDF/B Evaluated Nuclear Data File. All data are checked and reviewed by CSEWG, and the file is maintained at the NNDC. For a description of the ENDF/B-VI file, see the ENDF-102 Data Formats and Procedures for the Evaluated Nuclear Data File ENDF-6. The purpose of this addendum to the ENDF/B-VI Summary Documentation is to provide documentation of Releases 1, 2, 3, and 4 for the ENDF/B-VI and ENDF/HE-VI evaluated nuclear data libraries. These releases contain many new and revised evaluations for the neutron, photo-atomic interaction, radioactive decay data, spontaneous fission product yield, neutron-induced fission product yield, thermal neutron scattering, proton, deuteron, and triton sublibraries. The summaries have been extracted mainly from the ENDF/B-VI File 1 comments (MT = 451), which have been checked, edited, and may also include supplementary information. Some summaries have been provided by the evaluators in electronic format, while others are extracted from reports on the evaluations. All references have been checked and corrected, or updated where appropriate. A list of the laboratories which have contributed evaluations used in ENDF/B-VI is given.

McLane, V.

1996-12-01T23:59:59.000Z

31

AFS-2 FLOWSHEET MODIFICATIONS TO ADDRESS THE INGROWTH OF PU(VI) DURING METAL DISSOLUTION  

SciTech Connect (OSTI)

In support of the Alternate Feed Stock Two (AFS-2) PuO{sub 2} production campaign, Savannah River National Laboratory (SRNL) conducted a series of experiments concluding that dissolving Pu metal at 95C using a 610 M HNO{sub 3} solution containing 0.050.2 M KF and 02 g/L B could reduce the oxidation of Pu(IV) to Pu(VI) as compared to dissolving Pu metal under the same conditions but at or near the boiling temperature. This flowsheet was demonstrated by conducting Pu metal dissolutions at 95C to ensure that PuO{sub 2} solids were not formed during the dissolution. These dissolution parameters can be used for dissolving both Aqueous Polishing (AP) and MOX Process (MP) specification materials. Preceding the studies reported herein, two batches of Pu metal were dissolved in the H-Canyon 6.1D dissolver to prepare feed solution for the AFS-2 PuO{sub 2} production campaign. While in storage, UV-visible spectra obtained from an at-line spectrophotometer indicated the presence of Pu(VI). Analysis of the solutions also showed the presence of Fe, Ni, and Cr. Oxidation of Pu(IV) produced during metal dissolution to Pu(VI) is a concern for anion exchange purification. Anion exchange requires Pu in the +4 oxidation state for formation of the anionic plutonium(IV) hexanitrato complex which absorbs onto the resin. The presence of Pu(VI) in the anion feed solution would require a valence adjustment step to prevent losses. In addition, the presence of Cr(VI) would result in absorption of chromate ion onto the resin and could limit the purification of Pu from Cr which may challenge the purity specification of the final PuO{sub 2} product. Initial experiments were performed to quantify the rate of oxidation of Pu(IV) to Pu(VI) (presumed to be facilitated by Cr(VI)) as functions of the HNO{sub 3} concentration and temperature in simulated dissolution solutions containing Cr, Fe, and Ni. In these simulated Pu dissolutions studies, lowering the temperature from near boiling to 95 C reduced the oxidation rate of Pu(IV) to Pu(VI). For 8.1 M HNO{sub 3} simulated dissolution solutions, at near boiling conditions >35% Pu(VI) was present in 50 h while at 95 C <10% Pu(VI) was present at 50 h. At near boiling temperatures, eliminating the presence of Cr and varying the HNO{sub 3} concentration in the range of 78.5 M had little effect on the rate of conversion of Pu(IV) to Pu(VI). HNO{sub 3} oxidation of Pu(IV) to Pu(VI) in a pure solution has been reported previously. Based on simulated dissolution experiments, this study concluded that dissolving Pu metal at 95C using a 6 to 10 M HNO{sub 3} solution 0.050.2 M KF and 02 g/L B could reduce the rate of oxidation of Pu(IV) to Pu(VI) as compared to near boiling conditions. To demonstrate this flowsheet, two small-scale experiments were performed dissolving Pu metal up to 6.75 g/L. No Pu-containing residues were observed in the solutions after cooling. Using Pu metal dissolution rates measured during the experiments and a correlation developed by Holcomb, the time required to completely dissolve a batch of Pu metal in an H-Canyon dissolver using this flowsheet was estimated to require nearly 5 days (120 h). This value is reasonably consistent with an estimate based on the Batch 2 and 3 dissolution times in the 6.1D dissolver and Pu metal dissolution rates measured in this study and by Rudisill et al. Data from the present and previous studies show that the Pu metal dissolution rate decreases by a factor of approximately two when the temperature decreased from boiling (112 to 116C) to 95C. Therefore, the time required to dissolve a batch of Pu metal in an H-Canyon dissolver at 95C would likely double (from 36 to 54 h) and require 72 to 108 h depending on the surface area of the Pu metal. Based on the experimental studies, a Pu metal dissolution flowsheet utilizing 610 M HNO{sub 3} containing 0.050.2 M KF (with 02 g/L B) at 95C is recommended to reduce the oxidation of Pu(IV) to Pu(VI) as compared to near boiling conditions. The time required to completely di

Crapse, K.; Rudisill, T.; O'Rourke, P.; Kyser, E.

2014-07-02T23:59:59.000Z

32

Low Dose Radiation Program: Workshop VI Abstracts  

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

Workshop VI Principal Investigator and Abstracts Workshop VI Principal Investigator and Abstracts Anderson, Carl Whole Genome Analysis of Functional Protein Binding Sites and DNA Methylation: Application to p53 and Low Dose Ionizing Radiation. Averbeck, Dietrich Cellular Responses at Low Doses of Ionizing Radiation. Azzam, Edouard Adaptive Responses to Low Dose/Low Dose-Rate ?-Rays in Normal Human Fibroblasts: The Role of Oxidative Metabolism. Bailey, Susan The Role of Telomere Dysfunction in Driving Genomic Instability. Balajee, Adayabalam Low Dose Radiation Induced DNA Damage Signaling and Repair Responses in Human 3-Dimensional Skin Model System. Barcellos-Hoff, Mary Helen Imaging Bioinformatics for Mapping Multidimensional Responses. Barcellos-Hoff, Mary Helen Biological Response to Radiation Mediated through the Microenvironment and

33

Final Technical Report -- GEO-VI - USGEO  

SciTech Connect (OSTI)

Representatives of US earth observations departments and agencies, other participating governments, NGOs and civil society participated in the Sixth Plenary Meeting of the Group on Earth Observations (GEO-VI), hosted by the United States in Washington, DC on November 17 and 18, 2009. The meeting was held in the Atrium Ballroom of the Ronald Reagan International Trade Center. Exhibitions of international Earth observation technology and programs were held concurrently in the same venue. A number of GEO committee meetings and side events were held in conjunction with the GEO-VI Plenary, including the GEO-IGOS Symposium on Earth observation science and applications, the GEOSS in the Americas Forum on Coastal Zones, and separate meetings of the GEO Communities of Practice on Carbon, Health, and Air Quality.

Hirsch, Leonard

2009-11-30T23:59:59.000Z

34

DeMEASS VI Conference Ede, the Netherlands  

E-Print Network [OSTI]

DeMEASS VI Conference Ede, the Netherlands May 26-28, 2014 A Hybrid Trailing Edge Control Surface, YANG, G?RSES, AHN, ?ZGEN, YAMAN 2/23 DeMEASS VI Conference Ede, the Netherlands May 26-28, 2014, ?ZGEN, YAMAN DeMEASS VI Conference Ede, the Netherlands May 26-28, 2014 A Hybrid Trailing Edge Control

Yaman, Yavuz

35

Ch. VI, The geophysical environment around Waunita Hot Springs...  

Open Energy Info (EERE)

Ch. VI, The geophysical environment around Waunita Hot Springs Author A. L. Lange Editor T. G. Zacharakis Published Colorado Geological Survey in Cooperation with the U.S....

36

Air quality VI details environmental progress  

SciTech Connect (OSTI)

A report is given of the International Conference on Air Quality VI where key topics discussed were control of mercury, trace elements, sulphur trioxide and particulates. This year a separate track was added on greenhouse gas reduction, with panels on greenhouse gas policy and markets, CO{sub 2} capture and sequestration, and monitoring, mitigation and verification. In keynote remarks, NETL Director Carl Bauer noted that emissions have gone down since 1990 even though coal consumption has increased. The conference provided an overview of the state-of-the-science regarding key pollutants and CO{sub 2}, the corresponding regulatory environment, and the technology readiness of mitigation techniques. 1 photo.

NONE

2007-12-31T23:59:59.000Z

37

Integrated Ecogenomics Study for Bioremediation of Cr(VI) at Hanford 100H Area  

E-Print Network [OSTI]

reducer isolated from the Hanford 100H site capable of Iron(study for bioremediation of Cr(VI) at Hanford 100H area RomyVI)contamination at Hanford ?? Cr(VI) highly soluble, toxic

Chakraborty, Romy

2008-01-01T23:59:59.000Z

38

NUREG/CR-6911 Tests of Uranium (VI) Adsorption  

E-Print Network [OSTI]

NUREG/CR-6911 Tests of Uranium (VI) Adsorption Models in a Field Setting U.S. Geological Survey U/CR-6911 Tests of Uranium (VI) Adsorption Models in a Field Setting Manuscript Completed: August 2006 Date Published: August 2006 Prepared by G. P. Curtis, J. A. Davis Water Resources Division U.S. Geological Survey

39

Reduction of Np(VI) and Pu(VI) by organic chelating agents  

SciTech Connect (OSTI)

The reduction of NpO{sub 2}{sup 2+} and PuO{sub 2}{sup 2+} by oxalate, citrate, and ethylenediaminetetraacetic acid (EDTA) was investigated in low ionic strength media and brines. This was done to help establish the stability of the An(VI) oxidation state depended on the pH nd relative strength of the various oxidation state-specific complexes. At low ionic strength and pH 6, NpO{sub 2}{sup 2+} was rapidly reduced to form NpO{sub 2}{sup +} organic complexes. At longer times, Np(IV) organic complexes were observed in the presence of citrate. PuO{sub 2}{sup 2+} was predominantly reduced to Pu{sup 4+}, resulting in the formation of organic complexes or polymeric/hydrolytic precipitates. The relative rates of reduction to the An(V) complex were EDTA > citrate > oxalate. Subsequent reduction to An(IV) complexes, however, occurred in the following order: citrate > EDTA > oxalate because of the stability of the An(VI)-EDTA complex. The presence of organic complexants led to the rapid reduction of NpO{sub 2}{sup 2+} and PuO{sub 2}{sup 2+} in G-Seep brine at pHs 5 and 7. At pHs 8 and 10 in ERDA-6 brine, carbonate and hydrolytic complexes predominated and slowed down or prevented the reduction of An(VI) by the organics present.

Reed, D.T.; Wygmans, D.G.; Aase, S.B.; Banaszak, J.E. [Argonne National Lab., IL (United States)

1998-06-01T23:59:59.000Z

40

Residual oil saturation, Annex VI-1. Venezuela-MEM/USA-DOE fossil energy report VI-1  

SciTech Connect (OSTI)

This report, dealing with the US/Venezuela Cooperative exchange agreement on residual oil saturation (Annex VI), contains the results of efforts by scientists from both countries to improve the state of present technology for accurately measuring the amount of residual oil remaining in a particular reservoir of interest. To date, those efforts have resulted in an exchange of ideas through a sharing of technical literature and bibliographic listings pertinent to the subject, reciprocal visits to the laboratories and field sites where residual oil saturation measurement R and D is in progress, an exchange of ideas through workshops held in each country, and open discussions covering areas of future cooperative R and D. The text of the basic agreement , Annex VI and all amendments, are appended to the report. In addition to a chronicle of events detailing progress under Annex VI, this report also inlcudes a discussion of future work to be performed in the areas of subsidence accompanying the extraction of oil and interwell oil saturation measurement. A meeting was held in Bartlesville May 10 and 11 to formulate plans in this area.

Wesson, T.C.; VonDomselaar, H.

1983-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

SEGS VI Solar Power Plant | Open Energy Information  

Open Energy Info (EERE)

SEGS VI Solar Power Plant SEGS VI Solar Power Plant Jump to: navigation, search Name SEGS VI Solar Power Plant Facility SEGS VI Sector Solar Facility Type Concentrating Solar Power Developer Luz Location Kramer Junction, California Coordinates 34.9925°, -117.540833° 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":34.9925,"lon":-117.540833,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

42

Uranium(VI) Diffusion in Low-Permeability Subsurface Materials...  

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

Abstract: Uranium(VI) diffusion was investigated in a fine-grained saprolite sediment that was collected from U.S. Department of Energy (DOE) Oak Ridge site, TN, where...

43

The reduction of Np(VI) and Pu(VI) by organic chelating agents.  

SciTech Connect (OSTI)

The reduction of NpO{sup 2+} and PuO{sub 2}{sup 2+} by oxalate. citrate, and ethylenediaminetetraacetic acid (EDTA) was investigated in low ionic strength media and brines. This was done to help establish the stability of the An(VI) oxidation state in the presence of organic complexants. The stability of the An(VI) oxidation state depended on the pH and relative strength of the various oxidation state-specific complexes. At low ionic strength and pH 6, NpO{sub 2}O{sup 2+} was rapidly reduced to form NpO{sub 2}{sup +} organic complexes. At longer times, Np(IV) organic complexes were observed in the presence of citrate. PuO{sub 2}{sup 2+} was predominantly reduced to Pu{sup 4+}, resulting in the formation of organic complexes or polymeric/hydrolytic precipitates. The relative rates of reduction to the An(V) complex were EDTA > citrate > oxalate. Subsequent reduction to An(IV) complexes, however, occurred in the following order: citrate > EDTA > oxalate because of the stability of the An(V)-EDTA complex. The presence of organic complexants led to the rapid reduction of NpO{sub 2}{sup 2+} and PuO{sub 2}P{sup 2+} in G-seep brine at pHs 5 and 7. At pHs 8 and 10 in ERDA-6 brine, carbonate and hydrolytic complexes predominated and slowed down or prevented the reduction of An(VI) by the organics present.

Reed, D.T.; Aase, S.B.; Banaszak, J.E.

1998-03-19T23:59:59.000Z

44

VIM: Initial ENDF/B-VI experience  

SciTech Connect (OSTI)

The VIM Monte Carlo particle transport code uses detailed continuous-energy cross sections produced from ENDF/B data by a set of specialized codes developed or adapted for use at Argonne National Laboratory. ENDF/B-IV data were used until about 1979, and Version V data since then. These VIM libraries were extensively benchmarked against the MC{sup 2}-2 code and against ZPR and ZPPR criticals for fast spectrum calculations, as well as other fast and thermal experiments and calculations. Recently, the cross section processing codes have been upgraded to accommodate ENDF/B-VI files, and a small library has been tested. Several fundamental tasks comprise the construction of a faithful representation of ENDF data for VIM calculations: (1) The resolved resonance parameters are converted to Doppler-broadened continuous-energy cross sections with energy grids suitable for linear-linear interpolation. (2) The unresolved resonance parameter distributions are sampled to produce many (40-400) resonance ladders in each energy band. These are converted to Doppler-broadened continuous energy resonance cross sections that are then binned by cross section, accumulating ladders until statistical convergence, the result being probability tables of total cross sections and conditional mean scattering and fission cross sections. VIM samples these tables at run time, and File 3 back ground cross sections are added. (3) Anisotropic angular distribution data are converted to angular probability tables. All other ENDF data are unmodified, except for format.

Blomquist, R.N.

1997-08-01T23:59:59.000Z

45

Marcos Heil Costa Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, Brasil  

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

43 a 553. 43 a 553. 1 Efeitos de Variabilidade Climática e Desmatamento No Regime de Águas Superficiais Marcos Heil Costa Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, Brasil Michael T. Coe Woods Hole Research Center, Falmouth, Massachusetts, USA Jean Loup Guyot LMTG, Institut de Recherche pour le Développement, Toulouse, France O regime de escoamento de rios na Bacia Amazônica mostra uma considerável variabilidade em escalas interanuais e decadais. A principal fonte de variação são os eventos do El Niño-Oscilação Sul (ENOS). Eventos de El Niño causam diminuição de precipitação, escoamento fluvial e padrões de inundação em toda a região, com reduções mais fortes que ocorrem na parte norte da bacia. Por outro lado, os eventos do La Niña causam aumento

46

Speciation of uranium(VI) sorption complexes on montmorillonite  

SciTech Connect (OSTI)

Environmental contaminant releases that contain uranium are among the most serious problems that must be confronted by restoration programs. To facilitate restoration, information concerning the speciation of uranium is needed. Under oxidizing conditions, dissolved uranium is predominantly in the U(VI) (uranyl) form and is quite mobile in the environment, however sorption onto soils may retard its movement. In this study, we have investigated the effects of changes in solution speciation on the nature of uranyl sorption complexes on montmorillonite, a common soil constituent. Aqueous U(VI) solutions between pH 3 to 7 were batch-equilibrated with montmorillonite for several days; specific pH values were selected such that the solutions consisted of dominantly monomeric, oligomeric, or a mix of monomeric and oligomeric aqueous uranyl species. Emission spectroscopy was used to investigate the nature of U(VI) sorbed to montmorillonite.

Chisholm-Brause, C.J.; Morris, D.E. (Los Alamos National Lab., NM (United States)); Richard, R.E. (Fort Lewis Coll., Durango, CO (United States). Dept. of Chemistry)

1992-01-01T23:59:59.000Z

47

Nitrate Enhanced Microbial Cr(VI) Reduction-Final Report  

SciTech Connect (OSTI)

A major challenge for the bioremediation of radionuclides (i.e., uranium, technetium) and metals (i.e., Cr(VI), Hg) is the co-occurrence of nitrate as it can inhibit metal transformation. Denitrification (nitrate reduction to dinitrogen gas) is considered the most important ecological process. For many metal and metalloid reducing bacteria, however, ammonia is the end product through respiratory nitrate reduction (RNRA). The focus of this work was to determine how RNRA impacts Cr(VI) transformation. The goal was to elucidate the specific mechanism(s) that limits Cr(VI) reduction in the presence of nitrate and to use this information to develop strategies that enhance Cr(VI) reduction (and thus detoxification). Our central hypothesis is that nitrate impacts the biotransformation of metals and metalloids in three ways 1) as a competitive alternative electron acceptor (inhibiting transformation), 2) as a co-metabolite (i.e., concomitant reduction, stimulating transformation), and 3) as an inducer of specific proteins and pathways involved in oxidation/reduction reactions (stimulating transformation). We have identified three model organisms, Geobacter metallireducens (mechanism 1), Sulfurospirillum barnesii, (mechasism 2), and Desulfovibrio desulfuricans (mechanisms 3). Our specific aims were to 1) investigate the role of Cr(VI) concentration on the kinetics of both growth and reduction of nitrate, nitrite, and Cr(VI) in these three organisms; 2) develop a profile of bacterial enzymes involved in nitrate transformation (e.g., oxidoreductases) using a proteomic approach; 3) investigate the function of periplasmic nitrite reductase (Nrf) as a chromate reductase; and 4) develop a strategy to maximize microbial chromium reduction in the presence of nitrate. We found that growth on nitrate by G. metallireducens was inhibited by Cr(VI). Over 240 proteins were identified by LC/MS-MS. Redox active proteins, outer membrane heavy metal efflux proteins, and chemotaxis sensory proteins (Gmet_2478 and Gmet_1641) were up-regulated with exposure to Cr(VI). A nine-heme cytochrome C was purified that could reduce nitrite and could be oxidized by Cr(VI). For D. desulfuricans, we found that confirmed that Cr(VI) induced a prolonged lag period when Cr(VI) was reduced. Over three hundred proteins were unequivocally identified by LC/MS-MS and a significant number of down-regulated proteins for which the levels were changed >2 fold compared to control. Sulfite reductase levels were similar, however, nitrate and nitrite reductase were down-regulated. The supernatant of spent cultures was found to contain a filterable, heat stable compound that rapidly reduced Cr(VI). In addition, desulfoviridin was purified from nitrate grown cells and shown to have nitrite reductase activity that was inhibited by Cr(VI). For S. barnesii, periplasmic nitrate reductase (Nap), nitrite reductase (Nrf), and the metalloid reductase (Rar) were purified and characterized. The supernatant of spent cultures was also found to contain a filterable, heat stable compound that rapidly reduced Cr(VI) but that Rar also reduced Cr(VI). Our results from specific aims 1 through 3 indicate that for G. metallireducens, Cr(VI) inhibits nitrate respiration as it oxidizes cytochromes involved in nitrate respiration. Iron reduction is apparently not affected and the inhibitory affects of Cr(VI) may be attenuated by the addition of sufficient Fe(III) to generate Fe(II) that abiotically reduces the chromium. For S. barnesii, although the enzyme assays indicate that the components of the respiratory pathway for nitrate (e.g. Nap and Nrf) are inhibited by chromate, the organism has a mechanism to prevent this from actually occurring. Our current hypothesis is that the non-specific metalloid reductase (Rar) is providing resistance by reducing the Cr(VI). The strategy here would be to enhance its growth and metabolism in the natural setting. Lactate is a suitable electron donor for S. barnesii but other donors are possible. Although the version of the Phylochip used for monitoring the microb

John F. Stolz

2011-06-15T23:59:59.000Z

48

Energy and momentum of Bianchi Type VI_h Universes  

E-Print Network [OSTI]

We obtain the energy and momentum of the Bianchi type VI_h universes using different prescriptions for the energy-momentum complexes in the framework of general relativity. The energy and momentum of the Bianchi VI_h universe are found to be zero for the parameter h = -1 of the metric. The vanishing of these results support the conjecture of Tryon that Universe must have a zero net value for all conserved quantities.This also supports the work of Nathan Rosen with the Robertson-Walker metric. Moreover, it raises an interesting question: "Why h=-1 case is so special?"

S. K. Tripathy; B. Mishra; G. K. Pandey; A. K. Singh; T. Kumar; S. S. Xulu

2015-01-19T23:59:59.000Z

49

Energy and momentum of Bianchi Type VI_h Universes  

E-Print Network [OSTI]

We obtain the energy and momentum of the Bianchi type VI_h universes using different prescriptions for the energy-momentum complexes in the framework of general relativity. The energy and momentum of the Bianchi VI_h universe are found to be zero for the parameter h = -1 of the metric. The vanishing of these results support the conjecture of Tryon that Universe must have a zero net value for all conserved quantities.This also supports the work of Nathan Rosen with the Robertson-Walker metric. Moreover, it raises an interesting question: "Why h=-1 case is so special?"

Tripathy, S K; Pandey, G K; Singh, A K; Kumar, T; Xulu, S S

2015-01-01T23:59:59.000Z

50

Giant Quadrupole-Resonance in Ni Isotopes  

E-Print Network [OSTI]

Inelastic scattering of 129 MeV alpha particles has been used to excite the giant quadrupole resonance in Ni-58, Ni-60, Ni-62, Ni-64. The resonance was found to exhaust 58 +/- 12%, 76 +/- 14%, 78 +/- 14%, and 90 +/-16% of the E2 energy-weighted sum...

Youngblood, David H.; Lui, YW; Garg, U.; Peterson, R. J.

1992-01-01T23:59:59.000Z

51

Optimizing Cr(VI) adsorption on activated carbon produced from heavy oil fly ash  

Science Journals Connector (OSTI)

In order to explore the beneficial utilization of heavy oil fly ash (HOFA) generated in the power plants, the present study is intended to optimize the chromium(VI) [Cr(VI)] adsorption on activated carbon prod...

Abdullah Mofarrah; Tahir Husain; Bing Chen

2014-07-01T23:59:59.000Z

52

Accelerated Publications Three-Dimensional Structure of DesVI from Streptomyces Venezuelae: A Sugar  

E-Print Network [OSTI]

Accelerated Publications Three-Dimensional Structure of DesVI from Streptomyces Venezuelae: A Sugar for the biosynthesis of dTDP-desosamine in Streptomyces Venezuelae, with the last step catalyzed by DesVI, an N

Holden, Hazel

53

Abiotic U(VI) Reduction by Sorbed Fe(II) on Natural Sediments...  

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

U(VI) Reduction by Sorbed Fe(II) on Natural Sediments. Abiotic U(VI) Reduction by Sorbed Fe(II) on Natural Sediments. Abstract: Laboratory experiments were performed as a function...

54

N,N'-Dioctanoylpiperazine as a novel extractant for U(VI)  

Science Journals Connector (OSTI)

N,N'-Dioctanoylpiperazine (DOPEZ), a novel extractant for U(VI) in carbon tetrachloride has been studied. The principal factors affecting the U(VI) distribution ratio, i.e., the concentration of aqueous nitric ac...

Yang Xing-Cun; Bao Bo-Rong; Sun Guo-Xin

2003-12-01T23:59:59.000Z

55

E-Print Network 3.0 - air pollution vi Sample Search Results  

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

vi Search Powered by Explorit Topic List Advanced Search Sample search results for: air pollution vi Page: << < 1 2 3 4 5 > >> 1 Air Pollution Physics and Chemistry EAS 6790...

56

E-Print Network 3.0 - assessment methods vi Sample Search Results  

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

porous media. Materials and Methods Experimental... Effects of Solid-to-Solution Ratio on Uranium(VI) Adsorption and Its Implications T A O C H E N G... , Wisconsin 53706 U(VI)...

57

Probing the 5f electrons in a plutonyl(VI) cluster complex  

SciTech Connect (OSTI)

The authors report the structural, spectroscopic and preliminary magnetic characterization of a tri-metallic plutonyl(VI) polyoxometalate complex.

May, Iain [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

58

Advances in Fe(VI) charge storage: Part I. Primary alkaline super-iron batteries  

Science Journals Connector (OSTI)

Recent advances in super-iron batteries, based on an unusual Fe(VI) cathodic charge storage, are presented. Fe(VI) cathodes that have been demonstrated in super-iron batteries include the synthesized Fe(VI) compound with three-electron cathodic charge capacity Na2FeO4, K2FeO4, Rb2FeO4, Cs2FeO4 (alkali Fe(VI) salts), alkali earth Fe(VI) salts BaFeO4, SrFeO4, and also a transition Fe(VI) salt Ag2FeO4 which exhibits a five-electron cathodic charge storage. This paper focus on the primary alkaline Fe(VI) charge storage in aqueous electrolyte systems. Primary alkaline super-iron batteries exhibit a higher capacity than conventional alkaline batteries. Configuration optimization, enhancement and mediation of Fe(VI) cathode charge transfer of primary Fe(VI) alkaline batteries are summarized. Composite Fe(VI)/Mn(IV or VII), Fe(VI)/Ag(II) and zirconia coating stabilized Fe(VI)/Ag(II) cathode alkaline batteries are also illustrated.

Xingwen Yu; Stuart Licht

2007-01-01T23:59:59.000Z

59

E-Print Network 3.0 - automaatne- vi vabalpsissteem Sample Search...  

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

vi 2 value of bit 2 Does the 2-bit counter above reach state 11... v3 v4 v5 v6 v7 f0 f1 f2 fi vi+1 vi+3 ... Source: Franco, John - Department of Electrical and Computer...

60

Contribution of Extracellular Polymeric Substances from Shewanella sp. HRCR-1 Biofilms to U(VI) Immobilization  

SciTech Connect (OSTI)

The goal of this study was to quantify the contribution of extracellular polymeric substances (EPS) in U(VI) immobilization by Shewanella sp. HRCR-1. Through comparison of U(VI) immobilization using cells with bound EPS (bEPS) and cells without EPS, we showed that i) bEPS from Shewanella sp. HRCR-1 biofilms contributed significantly to U(VI) immobilization, especially at low initial U(VI) concentrations, through both sorption and reduction; ii) bEPS could be considered as a functional extension of the cells for U(VI) immobilization and they likely play more important roles at initial U(VI) concentrations; and iii) U(VI) reduction efficiency was found to be dependent upon initial U(VI) concentration and the efficiency decreased at lower concentrations. To quantify relative contribution of sorption and reduction in U(VI) immobilization by EPS fractions, we isolated loosely associated EPS (laEPS) and bEPS from Shewanella sp. HRCR-1 biofilms grown in a hollow fiber membrane biofilm reactor and tested their reactivity with U(V). We found that, when in reduced form, the isolated cell-free EPS fractions could reduce U(VI). Polysaccharides in the EPS likely contributed to U(VI) sorption and dominated reactivity of laEPS while redox active components (e.g., outer membrane c-type cytochromes), especially in bEPS, might facilitate U(VI) reduction.

Cao, Bin; Ahmed, B.; Kennedy, David W.; Wang, Zheming; Shi, Liang; Marshall, Matthew J.; Fredrickson, Jim K.; Isern, Nancy G.; Majors, Paul D.; Beyenal, Haluk

2011-06-05T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

Temperature effect on U(VI) sorption onto Na-bentonite1 Ziqian Yang a  

E-Print Network [OSTI]

1 Temperature effect on U(VI) sorption onto Na-bentonite1 Ziqian Yang a , Lei Huang a , Zhijun Guo Nantes/Université de5 Nantes, 4 rue Alfred Kastler, BP 20722, 44307 Nantes, France6 Sorption / U(VI ) / Na-bentonite / Temperature effect / Surface complexation model7 Summary8 U(VI) sorption on a purified

Boyer, Edmond

62

Bulk Migration of Ni/NiO in Ni-YSZ during Reducing Conditions...  

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

random grain orientation. The surface analysis and mapping were carried out using ToF-SIMS and AES whereas EDS maps on FIB sliced areas on Ni-YSZ were utilized for the bulk...

63

Remediation of chromium(VI) in the vadose zone: stoichiometry and kinetics of chromium(VI) reduction by sulfur dioxide  

E-Print Network [OSTI]

. The reaction was also rapid, with the half-time of about 45 minutes at pH 6 and about 16 hours at pH 7. A two-step kinetic model was developed to describe changes in concentrations of Cr(VI), S(IV), and S(V). Nonlinear regression was applied to obtain...

Ahn, Min

2004-11-15T23:59:59.000Z

64

The Obviative Suffix -ni- In Algonquian  

E-Print Network [OSTI]

the marker -ni- is used specifically when an argument has been established as obviative earlier in the discourse. By tracing -ni- in the morphology of Fox and Kickapoo and in Bloomfield's comparative Algonquian work (Bloomfield 1946), the present paper...

Gathercole, Geoffrey

1979-01-01T23:59:59.000Z

65

Monopole Strength in Ni-58  

E-Print Network [OSTI]

PHYSICAL REVIEW C VOLUME 44, NUMBER 5 Monopole strength in Ni NOVEMBER 1991 D. H. Youngblood and Y.-W. Lui Cyclotron Institute, Texas AdkM Uni Uersi ty, College Station, Texas 77843 (Received 20 June 1991) Differential cross-section data from... of Ener- gy under Grant No. DE-FG05-86ER40256. MONOPOLE STRENGTH IN "Ni 1881 [1]D. H. Youngblood, P. Bogucki, J. D. Bronson, U. Garg, Y.-W. Lui, and C. M. Rozsa, Phys. Rev. C 23, 1997 (1981). [2] M. Buenerd, J. Phys. C 4, 115 (1984). [3] S...

Youngblood, David H.; Lui, YW.

1991-01-01T23:59:59.000Z

66

El VI Festival de Teatro Hispano (Miami, 1991)  

E-Print Network [OSTI]

FALL 1991 153 El VI Festival de Teatro Hispano (Miami, 1991) Jos A. Escarpanter La sexta edicin del Festival de Teatro Hispano, organizado por Teatro Avante de Miami, se desarroll del 31 de mayo al 16 de junio, esta vez en dos teatros, lo... cual permiti la presentacin de un mayor nmero de grupos que en aos anteriores, pues cada noche se celebraron funciones en ambas salas. En total participaron diecisis conjuntos, de los cuales cuatro fueron compaas locales. De otras ciudades de...

Escarpanter, José A.

1991-10-01T23:59:59.000Z

67

2009 -Asia rld Reneuvable ffxx*rgy Smxlgr&$$ XSSS * Asia  

E-Print Network [OSTI]

ethanol blended with gasoline as a vehicle fuel. These include: 1) the effects on the emissions of air on the use of l0% by volume blends of ethanol with gasoline (E10), the most commonly used blend globally and sustainability of ethanol in gasoline. Niven reviews data available on five environmental aspects of using

68

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation  

SciTech Connect (OSTI)

The kinetics of Ni sorption to two Delaware agricultural soils were studied to quantitatively assess the relative importance of Ni adsorption on soil organic matter (SOM) and the formation of Ni layered double hydroxide (Ni-LDH) precipitates using both experimental studies and kinetic modeling. Batch sorption kinetic experiments were conducted with both soils at pH 6.0, 7.0, and 7.5 from 24 h up to 1 month. Time-resolved Ni speciation in soils was determined by X-ray absorption spectroscopy (XAS) during the kinetic experiments. A kinetics model was developed to describe Ni kinetic reactions under various reaction conditions and time scales, which integrated Ni adsorption on SOM with Ni-LDH precipitation in soils. The soil Ni speciation (adsorbed phases and Ni-LDH) calculated using the kinetics model was consistent with that obtained through XAS analysis during the sorption processes. Under our experimental conditions, both modeling and XAS results demonstrated that Ni adsorption on SOM was dominant in the short term and the formation of Ni-LDH precipitates accounted for the long-term Ni sequestration in soils, and, more interestingly, that the adsorbed Ni may slowly transfer to Ni-LDH phases with longer reaction times.

Shi, Zhenqing; Peltier, Edward; Sparks, Donald L. (Delaware); (Kansas)

2012-12-10T23:59:59.000Z

69

Summary of the planning, management, and evaluation process for the Geothermal Program Review VI conference  

SciTech Connect (OSTI)

The purpose of this document is to present an overview of the planning, facilitation, and evaluation process used to conduct the Geothermal Program Review VI (PR VI) conference. This document was also prepared to highlight lessons learned from PR VI and, by utilizing the evaluation summaries and recommendations, be used as a planning tool for PR VII. The conference, entitled Beyond Goals and Objectives,'' was sponsored by the US Department of Energy's (DOE) Geothermal Technology Division (GTD), PR VI was held in San Francisco, California on April 19--21, 1988 and was attended by 127 participants. PR VI was held in conjunction with the National Geothermal Association's (NGA) Industry Round Table. This document presents a brief summary of the activities, responsibilities, and resources for implementing the PR VI meeting and provides recommendations, checklists, and a proposed schedule for assisting in planning PR VII.

Not Available

1988-10-01T23:59:59.000Z

70

Method for making graded I-III-VI.sub.2 semiconductors and solar cell obtained thereby  

DOE Patents [OSTI]

Improved cell photovoltaic conversion efficiencies are obtained by the simultaneous elemental reactive evaporation process of Mickelsen and Chen for making semiconductors by closer control of the evaporation rates and substrate temperature during formation of the near contact, bulk, and near junction regions of a graded I-III-VI.sub.2, thin film, semiconductor, such as CuInSe.sub.2 /(Zn,Cd)S or another I-III-VI.sub.2 /II-VI heterojunction.

Devaney, Walter E. (Seattle, WA)

1987-08-04T23:59:59.000Z

71

Effects of Phosphate on Uranium(VI) Adsorption to Goethite-Coated Sand  

E-Print Network [OSTI]

Effects of Phosphate on Uranium(VI) Adsorption to Goethite-Coated Sand T A O C H E N G , M A R K O natural and contaminated environments. We studied U(VI) adsorption on goethite-coated sand (to mimic of increase in U(VI) adsorption. Phosphate was strongly bound by the goethite surface in the low pH range

Roden, Eric E.

72

RisNyt NO2 2005 I de kommende rtier vil vi se store  

E-Print Network [OSTI]

- per: For det første et meget tættere samspil mellem energiproduktion og forbrug end vi kender i dag

73

Fe(III) Reduction and U(VI) Immobilization by Paenibacillus sp...  

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

by Paenibacillus sp. Strain 300A, Isolated from Hanford 300A Subsurface Sediments. Fe(III) Reduction and U(VI) Immobilization by Paenibacillus sp. Strain 300A,...

74

U(VI) sorption and reduction kinetics on the magnetite (111) surface  

E-Print Network [OSTI]

U(VI) (introduced as uranyl nitrate), 1 mM NaNO 3 , [CO 3 ]respect to uraninite and uranyl nitrate mechanical mixture

Singer, D.M.

2013-01-01T23:59:59.000Z

75

Ni Sorption on Pyrophyllite: Evidence for the Formation of Ni-Al Hydroxide and Its Transformation into Ni-Silicate by Visible,  

E-Print Network [OSTI]

Ni Sorption on Pyrophyllite: Evidence for the Formation of Ni-Al Hydroxide and Its Transformation. Ford, K. S. Scheckel Former EXAFS studies of the sorption of Co and Ni on Al-containing clay minerals

Sparks, Donald L.

76

Evaluated nuclear data file ENDF/B-VI  

SciTech Connect (OSTI)

For the past 25 years, the United States Department of Energy has sponsored a cooperative program among its laboratories, contractors and university research programs to produce an evaluated nuclear data library which would be application independent and universally accepted. The product of this cooperative activity is the ENDF/B evaluated nuclear data file. After approximately eight years of development, a new version of the data file, ENDF/B-VI has been released. The essential features of this evaluated data library are described in this paper. 7 refs.

Dunford, C.L.

1991-01-01T23:59:59.000Z

77

Uranium (VI) solubility in carbonate-free ERDA-6 brine  

SciTech Connect (OSTI)

When present, uranium is usually an element of importance in a nuclear waste repository. In the Waste Isolation Pilot Plant (WIPP), uranium is the most prevalent actinide component by mass, with about 647 metric tons to be placed in the repository. Therefore, the chemistry of uranium, and especially its solubility in the WIPP conditions, needs to be well determined. Long-term experiments were performed to measure the solubility of uranium (VI) in carbonate-free ERDA-6 brine, a simulated WIPP brine, at pC{sub H+} values between 8 and 12.5. These data, obtained from the over-saturation approach, were the first repository-relevant data for the VI actinide oxidation state. The solubility trends observed pointed towards low uranium solubility in WIPP brines and a lack of amphotericity. At the expected pC{sub H+} in the WIPP ({approx} 9.5), measured uranium solubility approached 10{sup -7} M. The objective of these experiments was to establish a baseline solubility to further investigate the effects of carbonate complexation on uranium solubility in WIPP brines.

Lucchini, Jean-francois [Los Alamos National Laboratory; Khaing, Hnin [Los Alamos National Laboratory; Reed, Donald T [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

78

Revised evaluations for ENDF/B-VI Revision 2  

SciTech Connect (OSTI)

The purpose of this paper is to report on revised cross-section evaluations for 17 nuclides that have been prepared for ENDF/B-VI Revision 2. The nuclides considered include five fission products and various isotopes of cadmium and hafnium. The previous ENDF/B-VI evaluations for these 17 nuclides were carried over from ENDF/B-V and were completed in the 1974--1980 time period. By utilizing the experimental data that have become available since 1980 the revised evaluations will result in significant improvements in the evaluated nuclear data files. The primary emphasis was placed on the resolved and unresolved resonance regions, but new experimental data were also used to improve the cross sections for energies above the unresolved resonance region. Negative elastic scattering cross sections were encountered in some of the previous evaluations; since the revised evaluations use multilevel Breit-Wigner (MLBW) parameters, rather than single-level Breit-Wigner (SLBW), this problem is eliminated.

Wright, R.Q.

1993-03-01T23:59:59.000Z

79

Kinetics of chromium(VI) reduction by ferrous iron  

SciTech Connect (OSTI)

Chromium is a primary inorganic contaminant of concern at the Pantex Plant. Chromium concentrations have been found to be two orders of magnitude higher than the drinking water standards, particularly in certain wells in the perched aquifer below Zone 12. In situ reduction of a mobile form of chromium, Cr(VI) to an immobile form, Cr(III), was examined as a viable option to active soil restoration. Successfully immobilizing chromium in the vadose zone as Cr(III) will reduce the amount of chromium that reaches the groundwater table. The results from the solution experiments indicated that chromium was rapidly and stoichiometrically reduced by Fe(II) in solution. Also, the slurry experiments showed that the aquifer solids removed Fe(II) from solution, but a portion of the iron removed remained available for reaction with Cr(VI), but at a slower rate. A model to predict different amounts of iron pseudo-components was developed, which allowed prediction of iron amounts required to reduce chromium under in situ conditions.

Batchelor, B.; Schlautman, M.; Hwang, I.; Wang, R. [Texas A and M Univ., College Station, TX (United States). Dept. of Civil Engineering

1998-09-01T23:59:59.000Z

80

Properties of spark-deposited NiCrNiAl coatings  

Science Journals Connector (OSTI)

The structure and phase composition of sintered NiCrNiAl alloys and the kinetics of their electrospark deposition onto 45 steel are examined. It is ... shown that the mass transfer coefficient for the deposition

A. V. Paustovskii; R. A. Alfintseva

2009-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

UMBC Policy on Facilities Use UMBC Policy # VI-4.10.01 1  

E-Print Network [OSTI]

UMBC Policy on Facilities Use UMBC Policy # VI-4.10.01 1 I. Introduction This policy is predicated on the University System of Maryland Policy 145.0 VI-4.10- POLICY ON THE USE of Regents on January 11, 1990. The policy reads: 1. The physical facilities of the University System may

Adali, Tulay

82

Effects of Solid-to-Solution Ratio on Uranium(VI) Adsorption and Its  

E-Print Network [OSTI]

Effects of Solid-to-Solution Ratio on Uranium(VI) Adsorption and Its Implications T A O C H E N G, and Department of Geology and Geophysics, University of Wisconsin-Madison, 1215 West Dayton Street, Madison interacting ligands. Introduction The migration of uranium(VI), as well as other radionuclides and metal

Roden, Eric E.

83

Aerobic uranium (VI) bioprecipitation by metal-resistant bacteria isolated from radionuclide-  

E-Print Network [OSTI]

Aerobic uranium (VI) bioprecipitation by metal-resistant bacteria isolated from radionuclide uranium [U(VI)] mediated by the intrinsic phosphatase acti- vities of naturally occurring bacteria leaks occur, these wastes come into contact with surrounding geologic media, allowing for migration

Skolnick, Jeff

84

Magnetism in Ni-Cu Alloys  

Science Journals Connector (OSTI)

On the assumption that in Ni-Cu alloys the spin moment on a Ni atom depends on the local atomic environment, it was possible to find moment values for the various atomic configurations so as to give average moments in reasonable quantitative agreement with the values measured in the ferromagnetic composition range. The local environment is specified by the number of Ni nearest neighbors and the number of Ni second-nearest neighbors. This model allows also a consistent qualitative interpretation of the effect on the average moment of low-temperature annealing treatment and of plastic deformation.

C. G. Robbins; Helmut Claus; Paul A. Beck

1969-06-16T23:59:59.000Z

85

Chromium(VI) bioremoval by pseudomonas bacteria: role of microbial exudates for natural attenuation and biotreatment of Cr(VI) contamination  

SciTech Connect (OSTI)

Laboratory batch and column experiments were conducted to investigate the role of microbial exudates, e.g., exopolymeric substance (EPS) and alginic acid, on microbial Cr(VI) reduction by two different Pseudomonas strains (P. putida P18 and P. aeuroginosa P16) as a method for treating subsurface environment contaminated with Cr(VI). Our results indicate that microbial exudates significantly enhanced microbial Cr(VI) reduction rates by forming less toxic and highly soluble organo-Cr(III) complexes despite the fact Cr(III) has a very low solubility under the experimental conditions studied (e.g., pH 7). The formation of soluble organo-Cr(III) complexes led to the protection of the cells and chromate reductases from inactivation. In systems with no organic ligands, soluble organo-Cr(III) end products were formed between Cr(III) and the EPS directly released by bacteria due to cell lysis. Our results also provide evidence that cell lysis played an important role in microbial Cr(VI) reduction by Pseudomonas bacteria due to the release of constitutive reductases that intracellularly and/or extracellularly catalyzed the reduction of Cr(VI) to Cr(III). The overall results highlight the need for incorporation of the release and formation of organo-Cr(III) complexes into reactive transport models to more accurately design and monitor in situ microbial remediation techniques for the treatment of subsurface systems contaminated with Cr(VI).

Dogan, N.M.; Dodge, C.; Kantar, C.; Gulcan, S.; Yilmaz, B.C.; Mazmanci, M.A.

2011-02-14T23:59:59.000Z

86

Chromium(VI) Bioremoval by Pseudomonas Bacteria: Role of Microbial Exudates for Natural Attenuation and Biotreatment of Cr(VI) Contamination  

SciTech Connect (OSTI)

Laboratory batch and column experiments were conducted to investigate the role of microbial exudates, e.g., exopolymeric substance (EPS) and alginic acid, on microbial Cr(VI) reduction by two different Pseudomonas strains (P. putida P18 and P. aeuroginosa P16) as a method for treating subsurface environment contaminated with Cr(VI). Our results indicate that microbial exudates significantly enhanced microbial Cr(VI) reduction rates by forming less toxic and highly soluble organo-Cr(III) complexes despite the fact Cr(III) has a very low solubility under the experimental conditions studied (e.g., pH 7). The formation of soluble organo-Cr(III) complexes led to the protection of the cells and chromate reductases from inactivation. In systems with no organic ligands, soluble organo-Cr(III) end products were formed between Cr(III) and the EPS directly released by bacteria due to cell lysis. Our results also provide evidence that cell lysis played an important role in microbial Cr(VI) reduction by Pseudomonas bacteria due to the release of constitutive reductases that intracellularly and/or extracellularly catalyzed the reduction of Cr(VI) to Cr(III). The overall results highlight the need for incorporation of the release and formation of organo-Cr(III) complexes into reactive transport models to more accurately design and monitor in situ microbial remediation techniques for the treatment of subsurface systems contaminated with Cr(VI).

N Mercan Dogan; C Kantar; S Gulcan; C Dodge; B Coskun Yilmaz; M Ali Mazmanci

2011-12-31T23:59:59.000Z

87

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation  

E-Print Network [OSTI]

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation Zhenqing Shi, Lawrence, Kansas 66045-7609, United States *S Supporting Information ABSTRACT: The kinetics of Ni sorption) precipitates using both experimental studies and kinetic modeling. Batch sorption kinetic experiments were

Sparks, Donald L.

88

The role of nanopores on U(VI) sorption and redox behavior in U(VI)-contaminated subsurface sediments  

SciTech Connect (OSTI)

Most reactive surfaces in clay-dominated sediments are present within nanopores (pores of nm dimension). The behavior of geological fluids and minerals in nanopores is significantly different from those in normal non-nanoporous environments. The effect of nanopore surfaces on U(VI) sorption/desorption and reduction is likely to be significant in clay-rich subsurface environments. Our research results from both model nanopore system and natural sediments from both model system (synthetic nanopore alumina) and sediments from the ORNL Field Research Center prove that U(VI) sorption on nanopore surfaces can be greatly enhanced by nanopore confinement environments. The results from the project provide advanced mechanistic, quantitative information on the physiochemical controls on uranium sorption and redox behavior in subsurface sediments. The influence of nanopore surfaces on coupled uranium sorption/desorption and reduction processes is significant in virtually all subsurface environments, because most reactive surfaces are in fact nanopore surfaces. The results will enhance transfer of our laboratory-based research to a major field research initiative where reductive uranium immobilization is being investigated. Our results will also provide the basic science for developing in-situ colloidal barrier of nanoporous alumina in support of environmental remediation and long term stewardship of DOE sites.

Xu, Huifang; Roden, Eric E.; Kemner, Kenneth M.; Jung, Hun-Bok; Konishi, Hiromi; Boyanov, Maxim; Sun, Yubing; Mishra, Bhoopesh

2013-10-16T23:59:59.000Z

89

Integrated Ecogenomics Study for Bioremediation of Cr(VI) at Hanford 100H Area  

SciTech Connect (OSTI)

Hexavalent chromium is a widespread contaminant found in groundwater. In order to stimulate microbially mediated Cr(VI)-reduction, a poly-lactate compound was injected into Cr(VI)-contaminated aquifers at site 100H at Hanford. Investigation of bacterial community composition using high-density DNA microarray analysis of 16S rRNA gene products revealed a stimulation of Pseudomonas, Desulfovibrio and Geobacter species amongst others. Enrichment of these organisms coincided with continued Cr(VI) depletion. Functional gene-array analysis of DNA from monitoring well indicated high abundance of genes involved in nitrate-reduction, sulfate-reduction, iron-reduction, methanogenesis, chromium tolerance/reduction. Clone-library data revealed Psedomonas was the dominant genus in these samples. Based on above results, we conducted lab investigations to study the dominant anaerobic culturable microbial populations present at this site and their role in Cr(VI)-reduction. Enrichments using defined anaerobic media resulted in isolation of an iron-reducing, a sulfate-reducing and a nitrate-reducing isolate among several others. Preliminary 16S rDNA sequence analysis identified the isolates as Geobacter metallireducens, Pseudomonas stutzeri and Desulfovibrio vulgaris species respectively. The Pseudomonas isolate utilized acetate, lactate, glycerol and pyruvate as alternative carbon sources, and reduced Cr(VI). Anaerobic washed cell suspension of strain HLN reduced almost 95?M Cr(VI) within 4 hr. Further, with 100?M Cr(VI) as sole electron-acceptor, cells grew to 4.05 x 107 /ml over 24 h after an initial lag, demonstrating direct enzymatic Cr(VI) reduction coupled to growth. These results demonstrate that Cr(VI)-immobilization at Hanford 100H site could be mediated by direct microbial metabolism in addition to indirect chemical reduction of Cr(VI) by end-products of microbial activity.

Chakraborty, Romy; Chakraborty, Romy

2008-08-12T23:59:59.000Z

90

Bond formation at the Ni/ZrO2 interface  

Science Journals Connector (OSTI)

We report on the formation of strong chemical bonds at the Ni(100)/cubic-ZrO2(100) polar interfaces. Ab initio density functional theory calculations demonstrate that both Zr/Ni and O/Ni junctions are energetically stable, and predict that two different interactions determine the interface adhesion. Our results reveal that O-Ni ionic bonds are formed by Ni electron donation, while the Zr-Ni bonds show a mixed character with ionic and electron hybridization contributions.

J. I. Beltrn; S. Gallego; J. Cerd; J. S. Moya; M. C. Muoz

2003-08-07T23:59:59.000Z

91

Positron-annihilation measurements of vacancy formation in Ni and Ni(Ge)  

SciTech Connect (OSTI)

Vacancy formation in Ni and in dilute Ni(Ge) alloys was studied under thermal equilibrium conditions using positron-annihilation Doppler broadening. A monovacancy formation enthalpy of 1.8 +- 0.1 eV was determined for pure Ni; combining this result with that from previous tracer self-diffusion measurements, a monovacancy migration enthalpy of 1.1 +- 0.1 eV was also deduced. Analysis of the vacancy formation measurements in Ni(0.3 at.% Ge) and Ni(1 at.% Ge) yielded a value for the vacancy-Ge binding enthalpy of 0.20 +- 0.04 eV.

Smedskjaer, L.C.; Fluss, M.J.; Legnini, D.G.; Chason, M.K.; Siegel, R.W.

1982-03-01T23:59:59.000Z

92

CFD Simulation of the NREL Phase VI Rotor  

E-Print Network [OSTI]

The simulation of the turbulent and potentially separating flow around a rotating, twisted, and tapered airfoil is a challenging task for CFD simulations. This paper describes CFD simulations of the NREL Phase VI turbine that was experimentally characterized in the 24.4m x 36.6m NREL/NASA Ames wind tunnel (Hand et al., 2001). All computations in this article are performed on the experimental base configuration of 0o yaw angle, 3o tip pitch angle, and a rotation rate of 72 rpm. The significance of specific mesh resolution regions to the accuracy of the CFD prediction is discussed. The ability of CFD to capture bulk quantities, such as the shaft torque, and the detailed flow characteristics, such as the surface pressure distributions, are explored for different inlet wind speeds. Finally, the significant three-dimensionality of the boundary layer flow is demonstrated.

Song, Yang

2014-01-01T23:59:59.000Z

93

Purification and Characterization of [NiFe]-Hydrogenase of Shewanella...  

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

Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1. Purification and Characterization of NiFe-Hydrogenase of Shewanella oneidensis MR-1....

94

Microsoft Word - Tracking the Sun VI_working version.docx  

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

VI VI An Historical Summary of the Installed Price of Photovoltaics in the United States from 1998 to 2012 Galen Barbose, Naïm Darghouth, Samantha Weaver, and Ryan Wiser July 2013 Tracking the Sun VI An Historical Summary of the Installed Price of Photovoltaics in the United States from 1998 to 2012 Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory Primary Authors: Galen Barbose, Naïm Darghouth, Samantha Weaver, Ryan Wiser Executive Summary ...................................................................................................... 1 1. Introduction .............................................................................................................. 5 2. Data Summary .......................................................................................................... 8

95

Ni{sub 3}Al aluminide alloys  

SciTech Connect (OSTI)

This paper provides a brief review of the recent progress in research and development of Ni{sub 3}Al and its alloys. Emphasis has been placed on understanding low ductility and brittle fracture of Ni{sub 3}Al alloys at ambient and elevated temperatures. Recent studies have resulted in identifying both intrinsic and extrinsic factors governing the fracture behavior of Ni{sub 3}Al alloys. Parallel efforts on alloy design using physical metallurgy principles have led to properties for structural use. Industrial interest in these alloys is high, and examples of industrial involvement in processing and utilization of these alloys are briefly mentioned.

Liu, C.T.

1993-10-01T23:59:59.000Z

96

Constitutive Type VI Secretion System Expression Gives Vibrio cholerae Intra- and Interspecific Competitive Advantages  

E-Print Network [OSTI]

The type VI secretion system (T6SS) mediates protein translocation across the cell membrane of Gram-negative bacteria, including Vibrio cholerae the causative agent of cholera. All V. cholerae strains examined to date ...

Unterweger, Daniel

97

Microstructural analyses of Cr(VI) speciation in chromite ore processing Residue (COPR)  

E-Print Network [OSTI]

Christodoulatos, C. Ettringite-Induced Heave in Chromite Orehydrotalcite calcite quartz ettringite amorphous HB n.d.of the total Cr(VI). Ettringite (Ca 6 Al 2 (SO 4 ) 3 (OH) 12

CHRYSOCHOOU, MARIA

2010-01-01T23:59:59.000Z

98

Sorption von Ln(III)/An(III) und U(VI) an Tonmineralen und natrlichen Tongesteinen.  

E-Print Network [OSTI]

??In this thesis sorption of An(III)/(VI) is studied onto monomineralic clays and natural claystones by batch and spectroscopic studies and model calculations, in order to (more)

Hartmann, Eva

2010-01-01T23:59:59.000Z

99

Methylbutylmalonamide as an extractant for U(VI), Pu(IV) and Am(III)  

Science Journals Connector (OSTI)

The unsymmetrical diamide methylbuthylmalonamide has been synthesized and used in the extraction of U(VI), Pu(IV) and Am(III) in benzene medium. The distribution ratio for the three cations was found to increa...

G. M. Nair; D. R. Prabhu; G. R. Mahajan

1994-01-03T23:59:59.000Z

100

Dioctyl butyramide and dioctyl isobutyramide as extractants for uranium(VI) and plutonium(IV)  

Science Journals Connector (OSTI)

Two isomeric monoamides, dioctyl butyramide (DOBA) and dioctyl isobutyramide (DOIBA) were synthesized for extracting uranium(VI) and plutonium(IV) from aqueous nitric acid medium into various diluents such asn-do...

G. M. Nair; G. R. Mahajan; D. R. Prabhu

1996-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

Crystalline phases of II-VI compound semiconductors grown by pulsed laser deposition  

E-Print Network [OSTI]

-VI compound semiconductors, ZnS, ZnSe, CdS, CdSe, and CdTe, were grown epitaxially on 111 and 100 InP and Ga and mirror-like surface morphology. It was found that, on 111 -oriented substrates, CdS and CdSe films were, which is the main source of the troublesome native doping in II-VI compounds. High energy atoms and ions

Kwok, Hoi S.

102

Upscaling of U(VI) Desorption and Transport Using Decimeter-Scale Tanks  

SciTech Connect (OSTI)

Experimental work was used to validate modeling studies and develop multicontinuum models of U(VI) transport in a contaminated aquifer. At the bench scale, it has been shown that U(VI) desorption is rate-limited and that rates are dependent on the bicarbonate concentration. Two decimeter-scale experiments were conducted in order to help establish rigorous upscaling approaches that could be tested at the tracer test and plume scales.

Rodriguez, Derrick [Colorado School of Mines

2014-12-22T23:59:59.000Z

103

Bianchi {VI}$_{0}$ in Scalar and Scalar-Tensor Cosmologies  

E-Print Network [OSTI]

We study several cosmological models with Bianchi \\textrm{VI}$_{0}$ symmetries under the self-similar approach. In order to study how the \\textquotedblleft constants\\textquotedblright\\ $G$ and $\\Lambda$ may vary, we propose three scenarios where such constants are considered as time functions. The first model is a perfect fluid. We find that the behavior of $G$ and $\\Lambda$ are related. If $G$ behaves as a growing time function then $\\Lambda$ is a positive decreasing time function but if $G$ is decreasing then $\\Lambda$ is negative. For this model we have found a new solution. The second model is a scalar field, where in a phenomenological way, we consider a modification of the Klein-Gordon equation in order to take into account the variation of $G$. Our third scenario is a scalar-tensor model. We find three solutions for this models where $G$ is growing, constant or decreasing and $\\Lambda$ is a positive decreasing function or vanishes. We put special emphasis on calculating the curvature invariants in order to see if the solutions isotropize.

J. A. Belinchn

2011-09-13T23:59:59.000Z

104

Bulk solubility and speciation of plutonium(VI) in phosphate-containing solutions  

SciTech Connect (OSTI)

The solubility and speciation of Pu(VI) with phosphate as a function of pH was investigated to determine the ability of phosphate to act as an actinide getter. The general properties were first investigated and are reported here with the goal of performing more quantitative experiments in the future. Solubility was approached from oversaturation at initial pH = 4, 10 and 13.4. Absorption spectra were recorded, the solution filtered and the filtrate counted. Absorption spectra were obtained at varying phosphate concentrations and at pH of 2.7 to 11.9. The effect of complexation on the 833 mn Pu(VI) band was characterized. Evidence for three phosphate complexes was obtained for pH < 10 which have absorption bands at 842, 846 and 849 mn. Evidence for colloid formation was observed but is not conclusive. The possibility of colloids prevents accurate analysis of the solubility experiments. A concentration of 10[sup [minus]5] to 10[sup [minus]6] M Pu(VI) was measured in the filtrate at pH [le] 10 that were passed through a 50 mn filter. Pu(VI) complexes with phosphate over hydroxide at pH [le] 11.6, but at pH [ge] 11.9, only hydrolyzed Pu(VI) was detected. At pH = 12, the concentration of Pu(VI) was as high as 10[sup [minus]4] M.

Weger, H.T.; Okajima, S.; Cunnane, J.C.; Reed, D.T.

1992-01-01T23:59:59.000Z

105

Bulk solubility and speciation of plutonium(VI) in phosphate-containing solutions  

SciTech Connect (OSTI)

The solubility and speciation of Pu(VI) with phosphate as a function of pH was investigated to determine the ability of phosphate to act as an actinide getter. The general properties were first investigated and are reported here with the goal of performing more quantitative experiments in the future. Solubility was approached from oversaturation at initial pH = 4, 10 and 13.4. Absorption spectra were recorded, the solution filtered and the filtrate counted. Absorption spectra were obtained at varying phosphate concentrations and at pH of 2.7 to 11.9. The effect of complexation on the 833 mn Pu(VI) band was characterized. Evidence for three phosphate complexes was obtained for pH < 10 which have absorption bands at 842, 846 and 849 mn. Evidence for colloid formation was observed but is not conclusive. The possibility of colloids prevents accurate analysis of the solubility experiments. A concentration of 10{sup {minus}5} to 10{sup {minus}6} M Pu(VI) was measured in the filtrate at pH {le} 10 that were passed through a 50 mn filter. Pu(VI) complexes with phosphate over hydroxide at pH {le} 11.6, but at pH {ge} 11.9, only hydrolyzed Pu(VI) was detected. At pH = 12, the concentration of Pu(VI) was as high as 10{sup {minus}4} M.

Weger, H.T.; Okajima, S.; Cunnane, J.C.; Reed, D.T.

1992-12-01T23:59:59.000Z

106

Uranium(VI) extraction by TBP in the presence of HDBP  

SciTech Connect (OSTI)

The influence of di-n-butyl phosphoric acid (HDBP) upon extraction of uranium(VI) by tri-n-butyl phosphate (TBP) from 0.5--3.0 M nitric acid solutions has been studied. It has been shown that the uranium(VI) distribution coefficient D{sub U} for extraction by 1.1 M TBP in tri-decane or xylene is increased when HDBP is present in the organic phase. For iso-molar solutions of (TBP + HDBP) with a total concentration of 0.36 M, and Uranium(VI) aqueous concentration up to 10--20 g/l, a maximum value of D{sub U} is observed when TBP/HDBP = 1; for higher U(VI) concentration the maximum gradually disappears, with D{sub U} growing monotonically with the HDBP content in the organic phase. Uranium(VI) absorption spectra for 1.1 M TBP in tri-decane or xylene, containing HDBP, provide evidence for the formation of compounds, of which composition is intermediate between uranyl nitrate--TBP disolvate and the U(VI)--HDBP complex. It is proposed that these intermediate compounds are UO{sub 2}(NO{sub 3}){sub 2}HDBP.TBP and UO{sub 2}(NO{sub 3}){sub 2}(HDBP){sub 2}.

Fedorov, Yu.S.; Zilberman, B.Ya.; Kulikov, S.M.; Blazheva, I.V.; Mishin, E.N. [V.G. Khlopin Radium Inst., Saint-Petersburg (Russian Federation); Wallwork, A.L.; Denniss, I.S.; May, I. [British Nuclear Fuels plc, Sellafield (United Kingdom); Hill, N.J. [British Nuclear Fuels plc, Risley (United Kingdom)

1999-03-01T23:59:59.000Z

107

Electroslag surfacing of steel shafting with Ni alloy 625 and 70Cu-30Ni strip  

SciTech Connect (OSTI)

A comprehensive study of electroslag surfacing (ESS) of steel with Ni Alloy 625 and 70Cu-30Ni strip electrodes was conducted to establish the feasibility of replacing forged bearing sleeves on propulsion shafting with integral weld surfacing. The base material was MIL-S-23284, Class 1 steel in the form of 41--66 cm (16--26 in.) diameter shafting and 76 mm (3 in.) thick flat plate. All ESS was carried out at a heat input level of approximately 5.9kJ/mm (150 kJ/in.) using 30 x 0.5 mm (1.2 x 0.02 in.) strip electrodes. Assessments of mechanical properties and microstructure of Ni Alloy 625 surfacing and 70Cu-30Ni surfacing were conducted to establish the structure-property relationships in these complex alloy systems. In addition, a solidification cracking test was developed to determine the relative cracking susceptibilities of these strip surfacing alloys. Although the Ni Alloy 625 surfacing contained small islands of interdendritic MC type carbides and Laves phase, the mechanical properties of this surfacing were satisfactory. The 70Cu-30Ni surfacing required a buttering layer of 30Cu-70Ni or pure Ni to prevent solidification cracking. The inherent ductility-dip sensitivity of 70Cu-30Ni surfacing was overcome by the development of a suitable ESS procedure.

Devletian, J.H.; Gao, Y.P.; Wood, W.E. [Oregon Graduate Inst. of Science and Technology, Portland, OR (United States)

1996-12-31T23:59:59.000Z

108

New Ni Amidinate Source for ALD/CVD of NiNx, NiO and NiSi , Thiloma Perera1  

E-Print Network [OSTI]

to be particularly important in memory as well as logic applications. Nickel silicide (NiSi) is emerging with a metal-insulator-metal (MIM) structure, offer potential applications for the next generation nonvolatile

109

Photosensitivity of the Ni-A state of [NiFe] hydrogenase from Desulfovibrio vulgaris Miyazaki F with visible light  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer Ni-A state of [NiFe] hydrogenase showed light sensitivity. Black-Right-Pointing-Pointer New FT-IR bands were observed with light irradiation of the Ni-A state. Black-Right-Pointing-Pointer EPR g-values of the Ni-A state shifted upon light irradiation. Black-Right-Pointing-Pointer The light-induced state converted back to the Ni-A state under the dark condition. -- Abstract: [NiFe] hydrogenase catalyzes reversible oxidation of molecular hydrogen. Its active site is constructed of a hetero dinuclear Ni-Fe complex, and the oxidation state of the Ni ion changes according to the redox state of the enzyme. We found that the Ni-A state (an inactive unready, oxidized state) of [NiFe] hydrogenase from Desulfovibrio vulgaris Miyazaki F (DvMF) is light sensitive and forms a new state (Ni-AL) with irradiation of visible light. The Fourier transform infrared (FT-IR) bands at 1956, 2084 and 2094 cm{sup -1} of the Ni-A state shifted to 1971, 2086 and 2098 cm{sup -1} in the Ni-AL state. The g-values of g{sub x} = 2.30, g{sub y} = 2.23 and g{sub z} = 2.01 for the signals in the electron paramagnetic resonance (EPR) spectrum of the Ni-A state at room temperature varied for -0.009, +0.012 and +0.010, respectively, upon light irradiation. The light-induced Ni-AL state converted back immediately to the Ni-A state under dark condition at room temperature. These results show that the coordination structure of the Fe site of the Ni-A state of [NiFe] hydrogenase is perturbed significantly by light irradiation with relatively small coordination change at the Ni site.

Osuka, Hisao [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan) [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); Shomura, Yasuhito; Komori, Hirofumi; Shibata, Naoki [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan)] [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); Nagao, Satoshi [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan)] [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); Higuchi, Yoshiki, E-mail: hig@sci.u-hyogo.ac.jp [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan) [Graduate School of Life Science, University of Hyogo, 3-2-1, Koto, Kamigori-cho, Ako-gun, Hyogo 678-1297 (Japan); CREST, JST, Gobancho, Chiyoda-ku, Tokyo 102-0076 (Japan); Hirota, Shun, E-mail: hirota@ms.naist.jp [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan) [Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma-shi, Nara 630-0192 (Japan); CREST, JST, Gobancho, Chiyoda-ku, Tokyo 102-0076 (Japan)

2013-01-04T23:59:59.000Z

110

Size effects in Ni/Ni(OH)2 nanomaterials for electrochemical capacitors.  

SciTech Connect (OSTI)

Electrochemical capacitors based on redox-active metal oxides show great promise for many energy-storage applications. These materials store charge through both electric double-layer charging and faradaic reactions in the oxide. The dimensions of the oxide nanomaterials have a strong influence on the performance of such capacitors. Not just due to surface area effects, which influence the double-layer capacitance, but also through bulk electrical and ionic conductivities. Ni(OH)2 is a prime candidate for such applications, due to low cost and high theoretical capacity. We have examined the relationship between diameter and capacity for Ni/Ni(OH)2 nanorods. Specific capacitances of up to 511 F/g of Ni were recorded in 47 nm diameter Ni(OH)2 nanorods.

Bunker, Bruce Conrad; Limmer, Steven J.; Yelton, William Graham

2010-04-01T23:59:59.000Z

111

Structure of the type VI secretion phospholipase effector Tle1 provides insight into its hydrolysis and membrane targeting  

Science Journals Connector (OSTI)

Crystal structure and molecular dynamics simulations analysis of the type VI secretion phospholipase effector Tle1 provide insights into its hydrolysis and membrane targeting.

Hu, H.

2014-07-25T23:59:59.000Z

112

Chromium (VI) Reduction by Shewanella oneidensis MR-1 in Elevated Chromium Concentrations Exhibited in Corrosion Resistant Coatings.  

E-Print Network [OSTI]

??Hexavalent chromium Cr(VI) is included in stainless steel production, paints, finishes, and protective coatings as a corrosion inhibitor to help protect integrity of steel and (more)

Miller, Robert B, II

2014-01-01T23:59:59.000Z

113

Structure Analysis of a Precipitate Phase in an Ni-Rich High...  

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

Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape Memory Alloy. Structure Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape...

114

Airtricity Developments NI Ltd | Open Energy Information  

Open Energy Info (EERE)

NI Ltd NI Ltd Jump to: navigation, search Name Airtricity Developments NI Ltd Place Belfast, Northern Ireland, United Kingdom Zip BT2 7AF Sector Wind energy Product Focused on construction of wind farms in Northern Ireland. Coordinates 54.595295°, -5.934524° 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":54.595295,"lon":-5.934524,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

115

Magnetic quantum diesel engine in Ni2  

Science Journals Connector (OSTI)

Quantum Diesel cycles are numerically realized using the electronic states of a Ni2 dimer. The quantum nature and the complexity of the electronic structure of the Ni2 dimer result in new features in the evolution of the pressure as well as in the heat-work transformation. The multitude of internal degrees of freedom in the isobaric process in molecules can result in crossing of the two adiabatic processes in the P-V diagram. The interplay of heat and work, originating from thermal nonequilibrium effects, can lead to a thermal efficiency of up to 100%. The spin moment of the Ni2 can be decreased by the isobaric process. To link the molecular heat capacity to easily accessible experimental quantities, we also calculate the Kerr effect and the magnetic susceptibility at different temperatures and magnetic fields.

C. D. Dong; G. Lefkidis; W. Hbner

2013-12-20T23:59:59.000Z

116

T-637: VMSA-2011-0009 VMware hosted product updates, ESX patches and VI ,  

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

7: VMSA-2011-0009 VMware hosted product updates, ESX patches 7: VMSA-2011-0009 VMware hosted product updates, ESX patches and VI , Client update resolve multiple T-637: VMSA-2011-0009 VMware hosted product updates, ESX patches and VI , Client update resolve multiple June 6, 2011 - 3:04pm Addthis PROBLEM: VMSA-2011-0009 VMware hosted product updates, ESX patches and VI , Client update resolve multiple PLATFORM: Supported Platforms VMSA-2011-0009 ABSTRACT: This patch provides a fix for the following three security issues in the VMware Host Guest File System (HGFS). None of these issues affect Windows based Guest Operating Systems. CVE-2011-2146 Mount.vmhgfs Information Disclosure, information disclosure via a vulnerability that allows an attacker with access to the Guest to determine if a path exists in the Host filesystem and whether it is a file or directory regardless of permissions.

117

Energy absorption in Ni-Mn-Ga/ polymer composites  

E-Print Network [OSTI]

In recent years Ni-Mn-Ga has attracted considerable attention as a new kind of actuator material. Off-stoichiometric single crystals of Ni2MnGa can regularly exhibit 6% strain in tetragonal martensites and orthorhombic ...

Feuchtwanger, Jorge

2006-01-01T23:59:59.000Z

118

Carbon Nanotube Growth Using Ni Catalyst in Different Layouts  

E-Print Network [OSTI]

Vertically aligned carbon nanotubes have been grown using Ni as catalyst by plasma enhanced chemical vapor deposition system (PECVD) in various pre-patterned substrates. Ni was thermally evaporated on silicon substrates ...

Nguyen, H. Q.

119

Good and bad features of Ni-Cd cell designs  

SciTech Connect (OSTI)

Processes for spacecraft Ni-Cd cells are reviewed. Mechanical impregnation is compared against chemical and thermochemical impregnation.

Gross, S.

1996-02-01T23:59:59.000Z

120

Those early days as we remember them (Part VI) - Met Lab & Early Argonne History  

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

VI | Met Lab and Early Argonne History | Argonne National Laboratory VI | Met Lab and Early Argonne History | Argonne National Laboratory 1/2 Those early days as we remember them Part Vl Lester C. Furney (second from right), who formerly handled public relations at Argonne and is author of the article below, is pictured here in February 1956 with (l to r) Major General D. J. Keirn, Major General James McCormack, Jr. (Ret.), and Lt. General James H. Doolittle (Ret.) during a

Note: This page contains sample records for the topic "vi rgi ni" 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

FATE AND TRANSPORT OF RADIONUCLIDES [U(VI), Sr, Cs] IN VADOSE ZONE SEDIMENTS AT THE HANFORD SITE  

E-Print Network [OSTI]

FATE AND TRANSPORT OF RADIONUCLIDES [U(VI), Sr, Cs] IN VADOSE ZONE SEDIMENTS AT THE HANFORD SITE AND TRANSPORT OF RADIONUCLIDES [U(VI), Sr, Cs] IN VADOSE ZONE SEDIMENTS AT THE HANFORD SITE Abstract by Kenton A that influence radionuclide fate and transport in the Hanford vadose zone. Hanford was established for nuclear

Flury, Markus

122

Dampfdruckmessungen und Protonenresonanzuntersuchung an Hydriden der intermetallischen Phasen Ti2(Ni, Co) und Ti2(Ni, Fe)  

Science Journals Connector (OSTI)

NMR and hydrogen equilibrium pressure measurements were performed on hydrides of the intermetallic compounds Ti2(Ni, Co) and Ti2(Ni, Fe). The following values of enthalpy ?H and entropy ?S for the formation of th...

Engelbert Tuscher; Kurt Hiebl; Helmut Bittner

1981-02-01T23:59:59.000Z

123

CoNiGa High Temperature Shape Memory Alloys  

E-Print Network [OSTI]

commercially successful SMAs such as NiTi and Cu-based alloys. In recent years, the CoNiGa system has emerged as a new ferromagnetic shape memory alloy with some compositions exhibiting high martensitic transformation temperatures which makes CoNiGa a potential...

Dogan, Ebubekir

2011-10-21T23:59:59.000Z

124

High Temperature coatings based on {beta}-NiAI  

SciTech Connect (OSTI)

High temperature alloys are reviewed, focusing on current superalloys and their coatings. The synthesis, characerization, and oxidation performance of a NiAlTiB{sub 2} composite are explained. A novel coating process for MoNiAl alloys for improved oxidation performance is examined. The cyclic oxidation performance of coated and uncoated MoNiAl alloys is discussed.

Severs, Kevin

2012-07-10T23:59:59.000Z

125

Grain boundary compositon in NiAl  

SciTech Connect (OSTI)

The high temperature strength and oxidation resistance of many transition metal aluminides makes these intermetallic materials attractive for high temperature applications. However, these aluminides are generally brittle at low temperatures and this restricts their technological applications. However, these aluminides are generally brittle at low temperatures and this restricts their technological applications. It has been demonstrated that the addition of more than 200 ppm of boron to the L1{sub 2}-ordered Ni{sub 3}Al changes the fracture behavior from intergranular to transgranular and increases the ductility. The B2-ordered NiAl nickel aluminide is particularly attractive because of its low density and high melting temperature. This aluminide also fractures intergranularly at room temperature. However, no improvement in ductility is observed with similar boron additions even though the intergranular fracture is suppressed and there is a significant increase in the yield strength. In this paper, the results of an atom probe field ion microscopy investigation of the compositions of the grain boundaries in undoped and boron-doped NiAl are presented. The suitability of the atom probe field ion microscopy technique for the characterization of boundaries has clearly been demonstrated in many previous investigations including the characterization of boron segregation to grain boundaries and other planar features in Ni{sub 3}Al.

Miller, M.K.; Jayaram, R.; Camus, P.P. (Metals and Ceramics Div., Oak Ridge National Lab., Oak Ridge, TN (US))

1992-02-15T23:59:59.000Z

126

Geometric structures of thin film: Pt on Pd(110) and NiO on Ni(100)  

SciTech Connect (OSTI)

This thesis is divided into 3 papers: dynamical low-energy electron- diffraction investigation of lateral displacements in topmost layer of Pd(110); determination of (1{times}1) and (1{times}2) structures of Pt thin films on Pd(110) by dynamical low-energy electron-diffraction analysis; and structural determination of a NiO(111) film on Ni(100) by dynamical low-energy electron-diffraction analysis.

Warren, O.L.

1993-07-01T23:59:59.000Z

127

Ultrastructure of the Reproductive System of the Black Swamp Snake (Seminatrix pygaea). VI. Anterior  

E-Print Network [OSTI]

Ultrastructure of the Reproductive System of the Black Swamp Snake (Seminatrix pygaea). VI of the North American natricine snake Seminatrix pygaea are described using light and electron micros- copy is a glycoprotein. Overall, the characteristics of the ante- rior testicular ducts of this snake are concordant

Sever, David M.

128

Dendritic Chelating Agents. 2. U(VI) Binding to Poly(amidoamine) and  

E-Print Network [OSTI]

. Introduction The mining and processing of uranium ores and the production, reprocessing and disposal of uranium streams is a key compo- nent of the uranium nuclear fuel cycle (1­4). Uranyl [U(VI)] is the most stable uranium species under the typical oxidizing conditionsencounteredinthetreatmentofaqueouseffluents (3

Goddard III, William A.

129

PHYS 2750, Winter 2014 page 1 of 2 General Physics VI: Modern Physics  

E-Print Network [OSTI]

PHYS 2750, Winter 2014 page 1 of 2 General Physics VI: Modern Physics PHYS 2750 1. What is this course all about? The Golden Age of Physics is often referred to as the the period from the late 1800's up to about the mid 1900's. Physics 2750 is a course which explores many of the fundamental

Quirion, Guy

130

ViGs: A Grid Simulation and Monitoring Tool for ATLAS Aaron T. Thor1  

E-Print Network [OSTI]

, as the performance of a grid computing architecture is closely tied with its networking infrastructure acrossViGs: A Grid Simulation and Monitoring Tool for ATLAS Workflows Aaron T. Thor1 , Gergely V. Záruba1 boundaries, and encouraging collaborations. To date, setting up large scale grids has been mostly

Záruba, Gergely

131

Hydrogen, Fuel Cells, and Infrastructure Technologies FY 2002 Progress Report Section VI. Safety and Codes & Standards  

E-Print Network [OSTI]

to H2 from 0-100% at 450o C in N2 background Future Directions · Fabricate 2nd generation sensors.A Safety VI.A.1 Gallium Nitride Integrated Gas/Temperature Sensors for Fuel Cell System Monitoring catalytic gate field effect transistor (FET) sensors to resolve and detect carbon monoxide (CO

132

Photopumping of a C iii ultraviolet laser by Mn vi line radiation  

Science Journals Connector (OSTI)

Multiple-pass gain is reported at 2177 and 2163 A? in C iii ions in a vacuum-arc discharge, pumped by Mn vi line radiation from a laser-produced Mn plasma. These Be-like uv lasers pumped by resonant photoexcitation are prototypes for soft x-ray lasers in higher-Z, isoelectronic analogs.

Niansheng Qi and Mahadevan Krishnan

1987-11-02T23:59:59.000Z

133

Studies of the Di-iron(VI) Intermediate in Ferrate-Dependent Oxygen Evolution from Water  

E-Print Network [OSTI]

Information ABSTRACT: Molecular oxygen is produced from water via the following reaction of potassium ferrateStudies of the Di-iron(VI) Intermediate in Ferrate-Dependent Oxygen Evolution from Water Rupam consumption of natural abundance water. The derived 18 O KIEs provide insights concerning the identity

Roth, Justine P.

134

In the light of evolution VI: Brain and behavior Georg F. Striedtera,b  

E-Print Network [OSTI]

In the light of evolution VI: Brain and behavior Georg F. Striedtera,b , John C. Aviseb (1859), Darwin (1) barely mentioned the brain. Only in The Descent of Man, and Selection in Relation system, must have evolved. Even so, Darwin himself wrote little on the brain. Instead, Darwin asked his

Avise, John

135

VI. SENSOR CALIBRATIONS One of the most important aspects of high  

E-Print Network [OSTI]

13 VI. SENSOR CALIBRATIONS One of the most important aspects of high quality solar radiation measurements is the accurate calibration of sensors and recording instrumentation. To do this, several careful measurements must be made and evaluated. First, the response of the sensors to the incoming radiation must

Oregon, University of

136

Ni-Pt Silicide Formation Through Ti Mediating Layers  

SciTech Connect (OSTI)

With Ni1-xPtxSi, the variation in queue time between the final surface cleaning and Ni-Pt deposition represents a significant manufacturability issue. A short queue time is often difficult to maintain, leading to the formation of an oxide layer on the Si substrate prior to Ni-Pt deposition that can affect the formation of Ni1-xPtxSi and its texture. In this manuscript, it will be shown that an extended queue time prior to Ni-Pt deposition leads to morphological changes in the Ni1-xPtxSi formation sequence. A layer of Ti deposited between Ni-Pt and Si reduces the native oxide and may facilitate Ni1-xPtxSi formation. With increasing Ti thickness, the presence of metal-rich phases is gradually reduced and the formation temperature of Ni1-xPtxSi increases, suggesting a direct formation of Ni1-xPtxSi from Ni-Pt. In the presence of an interfacial oxide, an increase in formation temperature is also observed with increasing Ti interlayer thickness. When the Ti layer is sufficiently thick, the phase formation sequence becomes relatively insensitive to the presence of an interfacial oxide or extended queue time.

Besser,P.; Lavoie, C.; Ozcan, A.; Murray, C.; Strane, J.; Wong, K.; Gribelyuk, M.; Wang, Y.; Parks, C.; Jordan-Sweet, J.

2007-01-01T23:59:59.000Z

137

Characterization of U(VI) Sorption-Desorption Processes and Model Upscaling  

SciTech Connect (OSTI)

The objectives of the overall collaborative EMSP effort (with which this project is associated) were to characterize sorption and desorption processes of U(VI) on pristine and contaminated Hanford sediments over a range of sediment facies and materials properties and to relate such characterization both to fundamental molecular-scale understanding and field-scale models of geochemistry and mass transfer. The research was intended to provide new insights on the mechanisms of U(VI) retardation at Hanford, and to allow the development of approaches by which laboratory-developed geochemical models could be upscaled for defensible field-scale predictions of uranium transport in the environment. Within this broader context, objectives of the JHU-based project were to test hypotheses regarding the coupled roles of adsorption and impermeable-zone diffusion in controlling the fate and transport of U(VI) species under conditions of comparatively short-term exposure. In particular, this work tested the following hypotheses: (1) the primary adsorption processes in the Hanford sediment over the pH range of 7 to 10 are surface complexation reactions of aqueous U(VI) hydroxycarbonate and carbonate complexes with amphoteric edge sites on detrital phyllosilicates in the silt/clay size fraction; (2) macroscopic adsorption intensity (at given aqueous conditions) is a function of mineral composition and aquatic chemistry; and (3) equilibrium sorption and desorption to apply in short-term, laboratory-spiked pristine sediments; and (4) interparticle diffusion can be fully understood in terms of a model that couples molecular diffusion of uranium species in the porewater with equilibrium sorption under the relevant aqueous conditions. The primary focus of the work was on developing and applying both models and experiments to test the applicability of "local equilibrium" assumptions in the modeling interpretation of sorption retarded interparticle diffusion, as relevant to processes of U(VI) diffusion in silt/clay layers. Batch isotherm experiments were first used to confirm sorption isotherms under the intended test conditions and diffusion cell experiments were then conducted to explore the diffusion hypotheses. Important new information was obtained about the role of aqueous calcium and solid calcium carbonate in controlling sorption equilibrium with Hanford sediments. The retarded interparticle diffusion model with local sorption equilibrium was shown to very successfully simulate diffusion at high aqueous concentration of U(VI). By contrast, however, diffusion data obtained at low concentration suggested nonequilibrium of sorption even at diffusion time scales. Such nonequilibrium effects at low concentration are likely to be the result of sorption retarded intraparticle diffusion, and strong U(VI) sorption in the low concentration range.

Bai, Jing; Dong, Wenming; Ball, William P.

2006-10-12T23:59:59.000Z

138

Comparison of Three Ni-Hard I Alloys  

Office of Scientific and Technical Information (OSTI)

Comparison of Three Ni-Hard I Alloys Comparison of Three Ni-Hard I Alloys Ö. N. Do-an 1 , J.A. Hawk 1 , and J.Rice 2 1 U.S. Department of Energy, Albany Research Center, Albany, Oregon 2 Texaloy Foundry Co., Inc., Floresville, Texas Keywords: Ni-Hard white irons, Bainite, Martensite, Austenite, Abrasion resistant iron Abstract This report documents the results of an investigation which was undertaken to reveal the similarities and differences in the mechanical properties and microstructural characteristics of three Ni-Hard I alloys. One alloy (B1) is ASTM A532 class IA Ni-Hard containing 4.2 wt. pct. Ni. The second alloy (B2) is similar to B1 but higher in Cr, Si, and Mo. The third alloy (T1) also falls in the same ASTM specification, but it contains 3.3 wt. pct. Ni. The alloys were evaluated in both as-cast and

139

Reduction of Cr(VI) under acidic conditions by the facultative Fe(III)-reducing bacterium Acidiphilium cryptum  

SciTech Connect (OSTI)

The potential for biological reduction of Cr(VI) under acidic conditions was evaluated with the acidophilic, facultatively metal-reducing bacterium Acidiphilium cryptum strain JF-5 to explore the role of acidophilic microorganisms in the Cr cycle in low-pH environments. An anaerobic suspension of washed A. cryptum cells rapidly reduced 50 M Cr(VI) at pH 3.2; biological reduction was detected from pH 1.7-4.7. The reduction product, confirmed by XANES analysis, was entirely Cr(III) that was associated predominantly with the cell biomass (70-80%) with the residual residing in the aqueous phase. Reduction of Cr(VI) showed a pH optimum similar to that for growth and was inhibited by 5 mM HgCl2, suggesting that the reaction was enzyme-mediated. Introduction of O2 into the reaction medium slowed the reduction rate only slightly, whereas soluble Fe(III) (as ferric sulfate) increased the rate dramatically, presumably by the shuttling of electrons from bioreduced Fe(II) to Cr(VI) in a coupled biotic-abiotic cycle. Starved cells could not reduce Cr(VI) when provided as sole electron acceptor, indicating that Cr(VI) reduction is not an energy-conserving process in A. cryptum. We speculate, rather, that Cr(VI) reduction is used here as a detoxification mechanism.

David E. Cummings; Scott Fendorf; Rajesh K. Sani; Brent M. Peyton; Timothy S. Magnuson

2007-01-01T23:59:59.000Z

140

USE OF MICRO X-RAY ABSORPTION SPECTROSCOPY AND DIFFRACTION TO DELINEATE Cr(VI) SPECIATION IN COPR  

SciTech Connect (OSTI)

The speciation of Cr(VI) in Cromite Ore Processing Residue was investigated by means of bulk XRD, and a combination of micro-XRF, -XAS and -XRD at the Advanced Light Source (ALS), Berkeley, CA, U.S.A.. Bulk XRD yielded one group of phases that contained explicitly Cr(VI) in their structure, Calcium Aluminum Chromium Oxide Hydrates, accounting for 60% of the total Cr(VI). Micro-analyses at ALS yielded complimentary information, confirming that hydrogarnets and hydrotalcites, two mineral groups that can host Cr(VI) in their structure by substitution, were indeed Cr(VI) sinks. Chromatite (CaCrO4) was also identified by micro-XRD, which was not possible with bulk methods due to its low content. The acquisition of micro-XRF elemental maps enabled not only the identification of Cr(VI)-binding phases, but also the understanding of their location within the matrix. This information is invaluable when designing Cr(VI) treatment, to optimize release and availability for reduction.

CHRYSOCHOOU, M.; MOON, D. H.; FAKRA, S.; MARCUS, M.; DERMATAS, D.; CHRISTODOULATOS, C.

2010-06-22T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

SF 6432-NI (04-95)  

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

6/14/11 6/14/11 Page 1 of 14 Printed copies of this document are uncontrolled. Retrieve latest version electronically. SF 6432-NI (06/14/11) SECTION II STANDARD TERMS AND CONDITIONS FOR FIXED PRICE CONTRACTS WITH THE NEWLY INDEPENDENT STATES OF THE FORMER SOVIET UNION INDEX OF CLAUSES. THE FOLLOWING CLAUSES APPLY TO REQUESTS FOR QUOTATION AND CONTRACTS AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE SIGNATURE PAGE OR SECTION I. NI01 - ACCEPTANCE OF TERMS AND CONDITIONS Contractor, by signing this Agreement, beginning performance, and/or delivering Items or services ordered under this Agreement, agrees to comply with all the terms and conditions and all specifications and other documents that this Contract incorporated by

142

Microsoft Word - NiR.doc  

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

Side-on Cu-Nitrosyl Coordination by Nitrite Reductase Side-on Cu-Nitrosyl Coordination by Nitrite Reductase Elitza I. Tocheva and Michael E. P. Murphy Department of Microbiology & Immunology, The University of British Columbia, Vancouver, BC, Canada V6T 1Z3. Nitric oxide (NO) is one of the smallest and simplest biologically active molecules. In mammals, NO is produced from arginine by isoforms of nitric oxide synthase, and it func- tions in signal transduction and as a cytoprotective or cytotoxic agent. In bacteria, NO is produced by nitrite reductase (NiR), a copper-containing enzyme, which is responsible for the reduction of nitrite to nitric oxide (NO) in the process of dissimilatory denitrification. Cu- containing NiRs are homotrimers with two distinct Cu sites per monomeric unit (1). The type

143

Investigation on Microbial Dissolution of Uranium (VI) from Autunite Mineral - 13421  

SciTech Connect (OSTI)

Precipitating autunite minerals by polyphosphate injection was identified as a feasible remediation strategy for sequestering uranium in contaminated groundwater and soil in situ at the Hanford Site. Autunite stability under vadose and saturated zone environmental conditions can help to determine the long-term effectiveness of this remediation strategy. The Arthrobacter bacteria are one of the most common groups in soils and are found in large numbers in Hanford soil as well as other subsurface environments contaminated with radionuclides. Ubiquitous in subsurface microbial communities, these bacteria can play a significant role in the dissolution of minerals and the formation of secondary minerals. The main objective of this investigation was to study the bacterial interactions under oxidizing conditions with uranium (VI); study the potential role of bicarbonate, which is an integral complexing ligand for U(VI) and a major ion in groundwater compositions; and present data from autunite dissolution experiments using Arthrobacter strain G968, a less U(VI)-tolerant strain. Sterile 100 mL glass mixed reactors served as the major bioreactor for initial experimentation. These autunite-containing bioreactors were injected with bacterial cells after the autunite equilibrated with the media solution amended with 0 mM, 3 mM 5 mM and 10 mM concentrations of bicarbonate. G968 Arthrobacter cells in the amount of 10{sup 6} cells/mL were injected into the reactors after 27 days, giving time for the autunite to reach steady state. Abiotic non-carbonate controls were kept without bacterial inoculation to provide a control for the biotic samples. Samples of the solution were analyzed for dissolved U(VI) by means of kinetic phosphorescence analyzer KPA-11 (Chemcheck Instruments, Richland, WA). Analysis showed that as [HCO{sub 3}{sup -}] increases, a diminishing trend on the effect of bacteria on autunite leaching is observed. Viability of cells was conducted after 24 hours of cell incubation with the appropriate uranium and bicarbonate concentration treatment. As expected, the cells started to reduce after day 41 due to the nutritional exhaustion of the media. Moreover, viable bacteria accounted for more than 94% in the presence of 10 mM bicarbonate. Experiments showed that despite differences between the G975 and the G968 bacterial strains resistance to U(VI), in the presence of bicarbonate ions they are able to dissolute uranium from autunite mineral at the same capacity. The effect of both bacterial strains on autunite dissolution is reduced as the concentration of bicarbonate increases while the increase in soluble U(VI) concentration induced by G968 and G975 is dwarfed, for larger [HCO{sub 3}{sup -}]. (authors)

Sepulveda, Paola; Katsenovich, Yelena; Lagos, Leonel [Applied Research Center, Florida International University. 10555 West Flagler St. Suite 2100, Miami Fl 33175 (United States)] [Applied Research Center, Florida International University. 10555 West Flagler St. Suite 2100, Miami Fl 33175 (United States)

2013-07-01T23:59:59.000Z

144

In Situ Bioreduction of Uranium (VI) to Submicromolar Levels and Reoxidation by Dissolved Oxygen  

SciTech Connect (OSTI)

Groundwater within Area 3 of the U.S. Department of Energy (DOE) Environmental Remediation Sciences Program (ERSP) Field Research Center at Oak Ridge, TN (ORFRC) contains up to 135 {micro}M uranium as U(VI). Through a series of experiments at a pilot scale test facility, we explored the lower limits of groundwater U(VI) that can be achieved by in-situ biostimulation and the effects of dissolved oxygen on immobilized uranium. Weekly 2 day additions of ethanol over a 2-year period stimulated growth of denitrifying, Fe(III)-reducing, and sulfate-reducing bacteria, and immobilization of uranium as U(IV), with dissolved uranium concentrations decreasing to low levels. Following sulfite addition to remove dissolved oxygen, aqueous U(VI) concentrations fell below the U.S. Environmental Protection Agency maximum contaminant limit (MCL) for drinking water (<30 {micro}g L{sup -1} or 0.126 {micro}M). Under anaerobic conditions, these low concentrations were stable, even in the absence of added ethanol. However, when sulfite additions stopped, and dissolved oxygen (4.0-5.5 mg L{sup -1}) entered the injection well, spatially variable changes in aqueous U(VI) occurred over a 60 day period, with concentrations increasing rapidly from <0.13 to 2.0 {micro}M at a multilevel sampling (MLS) well located close to the injection well, but changing little at an MLS well located further away. Resumption of ethanol addition restored reduction of Fe(III), sulfate, and U(VI) within 36 h. After 2 years of ethanol addition, X-ray absorption near-edge structure spectroscopy (XANES) analyses indicated that U(IV) comprised 60-80% of the total uranium in sediment samples. At the completion of the project (day 1260), U concentrations in MLS wells were less than 0.1 {micro}M. The microbial community at MLS wells with low U(VI) contained bacteria that are known to reduce uranium, including Desulfovibrio spp. and Geobacter spp., in both sediment and groundwater. The dominant Fe(III)-reducing species were Geothrix spp.

Wu, Weimin [ORNL; Carley, Jack M [ORNL; Luo, Jian [Stanford University; Ginder-Vogel, Matthew A. [Stanford University; Cardenas, Erick [Michigan State University, East Lansing; Leigh, Mary Beth [Michigan State University, East Lansing; Hwang, Chaichi [Miami University, Oxford, OH; Kelly, Shelly D [Argonne National Laboratory (ANL); Ruan, Chuanmin [ORNL; Wu, Liyou [University of Oklahoma, Norman; Van Nostrand, Joy [University of Oklahoma, Norman; Gentry, Terry J [ORNL; Lowe, Kenneth Alan [ORNL; Mehlhorn, Tonia L [ORNL; Carroll, Sue L [ORNL; Luo, Wensui [ORNL; Fields, Matthew Wayne [Miami University, Oxford, OH; Gu, Baohua [ORNL; Watson, David B [ORNL; Kemner, Kenneth M [Argonne National Laboratory (ANL); Marsh, Terence [Michigan State University, East Lansing; Tiedje, James [Michigan State University, East Lansing; Zhou, Jizhong [University of Oklahoma, Norman; Fendorf, Scott [Stanford University; Kitanidis, Peter K. [Stanford University; Jardine, Philip M [ORNL; Criddle, Craig [ORNL

2007-01-01T23:59:59.000Z

145

Effects of Chromium(VI) and Chromium(III) on Desulfovibrio vulgaris Cells  

SciTech Connect (OSTI)

Desulfovibrio vulgaris ATCC 29579 is a well studied sulfate reducer that has known capabilities of reducing heavy metals and radionuclides, like chromium and uranium. Cultures grown in a defined medium (i.e. LS4D) had a lag period of approximately 40 h when exposed to 50 ?Mof Cr(VI). Substrate analysis revealed that although chromium is reduced within the first 5 h, growth does not resume for another 35 h. During this time, small amounts of lactate are still utilized but the reduction of sulfate does not occur. Sulfate reduction occurs concurrently with the accumulation of acetate approximately 40 h after inoculation, when growth resumes. Similar amounts of hydrogen are produced during this time compared to hydrogen production by cells not exposed to Cr(VI); therefore an accumulation of hydrogen cannot account for the utilization of lactate. There is a significant decrease in the carbohydrate to protein ratio at approximately 25 h, and this result indicated that lactate is not converted to glycogen. Most probable number analysis indicated that cell viability decreased steadily after inoculation and reached approximately 6 x 104 cells/ml 20 h post-chromium exposure. Regeneration of reducing conditions during chromium exposure does not induce growth and in fact may make the growth conditions even more unfavorable. This result suggested that an increase in Eh was not solely responsible for the decline in viability. Cell pellets collected 10 h after chromium-exposure were unable to resume growth when suspended into fresh medium. Supernatants from these pellets were able to support cell growth upon re- inoculation. D. vulgaris cells treated with a non-dose dependent addition of ascorbate at the same time of Cr(VI) addition did not enter a lag period. Ascorbate added 3 h post-Cr(VI) exposure did not prevent the growth lag. These results indicated that Desulfovibrio utilized lactate to reduce Cr(VI) without the reduction of sulfate, that the decline in cell viability and cell growth was most likely a consequence of Cr(III), and that an organic ligand could protect D. vulgaris cells from Cr(III) toxicity. Lactate consumption decoupled from sulfate reduction in the presence of Cr(VI) could provide organic carbon for organo- Cr(III) complexes.

M.E. Clark; A. Klonowska; S.B. Thieman; B. Giles; J.D. Wall; and M.W. Fields

2007-04-19T23:59:59.000Z

146

NiW and NiRu Bimetallic Catalysts for Ethylene Steam Reforming: Alternative Mechanisms for Sulfur Resistance  

SciTech Connect (OSTI)

Previous investigations of Ni-based catalysts for the steam reforming of hydrocarbons have indicated that the addition of a second metal can reduce the effects of sulfur poisoning. Two systems that have previously shown promise for such applications, NiW and NiRu, are considered here for the steam reforming of ethylene, a key component of biomass derived tars. Monometallic and bimetallic Al{sub 2}O{sub 3}-supported Ni and W catalysts were employed for ethylene steam reforming in the presence and absence of sulfur. The NiW catalysts were less active than Ni in the absence of sulfur, but were more active in the presence of 50 ppm H{sub 2}S. The mechanism for the W-induced improvements in sulfur resistance appears to be different from that for Ru in NiRu. To probe reasons for the sulfur resistance of NiRu, the adsorption of S and C{sub 2}H{sub 4} on several bimetallic NiRu alloy surfaces ranging from 11 to 33 % Ru was studied using density functional theory (DFT). The DFT studies reveal that sulfur adsorption is generally favored on hollow sites containing Ru. Ethylene preferentially adsorbs atop the Ru atom in all the NiRu (111) alloys investigated. By comparing trends across the various bimetallic models considered, sulfur adsorption was observed to be correlated with the density of occupied states near the Fermi level while C{sub 2}H{sub 4} adsorption was correlated with the number of unoccupied states in the d-band. The diverging mechanisms for S and C{sub 2}H{sub 4} adsorption allow for bimetallic surfaces such as NiRu that enhance ethylene binding without accompanying increases in sulfur binding energy. In contrast, bimetallics such as NiSn and NiW appear to decrease the affinity of the surface for both the reagent and the poison.

Rangan, M.; Yung, M. M.; Medlin, J. W.

2012-06-01T23:59:59.000Z

147

Rate-limited U(VI) desorption during a small-scale tracer test in a hetereogeneous uranium contaminated aquifer  

E-Print Network [OSTI]

of Contaminants in the Hanford Vadose Zone, Vadose Zone J. ,transport in a contaminated Hanford sediment, Environ. Sci.of U(VI) observed in Hanford sediment column experiments. A

Fox, P.M.

2013-01-01T23:59:59.000Z

148

Microbial community changes during sustained Cr(VI) reduction at the 100H site in Hanford, WA  

E-Print Network [OSTI]

at the 100H site in Hanford, WA Romy Chakraborty 1 , Eoin Lcontaminated aquifer at the Hanford (WA) 100H site in 2004.Cr(VI) reduction at Hanford, and a comparison of the

Chakraborty, Romy

2010-01-01T23:59:59.000Z

149

Influence of flow regime on U(VI) sorption kinetics in fine sediments at the Hanford site, Washington, USA.  

E-Print Network [OSTI]

??The effect of flow rate on U(VI) sorption kinetics was investigated by a series of column tests using the reactive mass fraction (<2mm) of sediments (more)

Moser, Jessa V.

2012-01-01T23:59:59.000Z

150

Etudes spectroscopiques du dopage dans les matriaux II-VI pour les dtecteurs infrarouge et les cellules photovoltaques.  

E-Print Network [OSTI]

??Ce travail de thse prsente les caractristiques optiques et lectriques de dopants dans des couches de CdHgTe, CdZnTe et CdS. Ces 3 matriaux II-VI ont (more)

Gemain, Frdrique

2012-01-01T23:59:59.000Z

151

Ruthenium(VI) catalyzed oxidation of sodium salts of lactic, tartaric and glycolic acid by alkaline hexacyanoferrate(III)  

Science Journals Connector (OSTI)

The kinetics of ruthenium(VI) catalyzed oxidation of sodium salts of lactic, tartaric and glycolic acid by hexacyanoferrate(III) in aqueous alkaline medium have been studied at constant ionic strength. The rea...

P. Kumar; K. C. Gupta; K. Vehari

1985-01-01T23:59:59.000Z

152

Extraction of uranium(VI) and plutonium(IV) with dihexylbutyramide and dihexylisobutyramide from nitric acid medium  

Science Journals Connector (OSTI)

The extraction of uranium(VI) and plutonium(IV) was carried out with two isomeric monoamides, dihexylbutyramide (DHBA) and dihexylisobutyramide (DHIBA) from nitric acid medium, usingn-dodecane as diluent. The pos...

G. M. Nair; D. R. Prabhu; G. R. Mahajan

1994-08-01T23:59:59.000Z

153

Fusion of radioactive $^{132}$Sn with $^{64}$Ni  

E-Print Network [OSTI]

Evaporation residue and fission cross sections of radioactive $^{132}$Sn on $^{64}$Ni were measured near the Coulomb barrier. A large sub-barrier fusion enhancement was observed. Coupled-channel calculations including inelastic excitation of the projectile and target, and neutron transfer are in good agreement with the measured fusion excitation function. When the change in nuclear size and shift in barrier height are accounted for, there is no extra fusion enhancement in $^{132}$Sn+$^{64}$Ni with respect to stable Sn+$^{64}$Ni. A systematic comparison of evaporation residue cross sections for the fusion of even $^{112-124}$Sn and $^{132}$Sn with $^{64}$Ni is presented.

J. F. Liang; D. Shapira; J. R. Beene; C. J. Gross; R. L. Varner; A. Galindo-Uribarri; J. Gomez del Campo; P. A. Hausladen; P. E. Mueller; D. W. Stracener; H. Amro; J. J. Kolata; J. D. Bierman; A. L. Caraley; K. L. Jones; Y. Larochelle; W. Loveland; D. Peterson

2007-04-05T23:59:59.000Z

154

Computing Free Energy Landscapes: Application to Ni-based Electrocatal...  

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

Computing Free Energy Landscapes: Application to Ni-based Electrocatalysts with Pendant Amines for H2 Production and Oxidation. Computing Free Energy Landscapes: Application to...

155

Heteroepitaxy of group IV-VI nitrides by atomic layer deposition  

SciTech Connect (OSTI)

Heteroepitaxial growth of selected group IV-VI nitrides on various orientations of sapphire (?-Al{sub 2}O{sub 3}) is demonstrated using atomic layer deposition. High quality, epitaxial films are produced at significantly lower temperatures than required by conventional deposition methods. Characterization of electrical and superconducting properties of epitaxial films reveals a reduced room temperature resistivity and increased residual resistance ratio for films deposited on sapphire compared to polycrystalline samples deposited concurrently on fused quartz substrates.

Klug, Jeffrey A., E-mail: jklug@anl.gov; Groll, Nickolas R.; Pellin, Michael J.; Proslier, Thomas, E-mail: prolier@anl.gov [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)] [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Becker, Nicholas G.; Cao, Chaoyue; Zasadzinski, John F. [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616 (United States); Weimer, Matthew S. [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) [Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616 (United States)

2013-11-18T23:59:59.000Z

156

New thermal neutron scattering files for ENDF/B-VI release 2  

SciTech Connect (OSTI)

At thermal neutron energies, the binding of the scattering nucleus in a solid, liquid, or gas affects the cross section and the distribution of secondary neutrons. These effects are described in the thermal sub-library of Version VI of the Evaluated Nuclear Data Files (ENDF/B-VI) using the File 7 format. In the original release of the ENDF/B-VI library, the data in File 7 were obtained by converting the thermal scattering evaluations of ENDF/B-III to the ENDF-6 format. These original evaluations were prepared at General Atomics (GA) in the late sixties, and they suffer from accuracy limitations imposed by the computers of the day. This report describes new evaluations for six of the thermal moderator materials and six new cold moderator materials. The calculations were made with the LEAPR module of NJOY, which uses methods based on the British code LEAP, together with the original GA physics models, to obtain new ENDF files that are accurate over a wider range of energy and momentum transfer than the existing files. The new materials are H in H{sub 2}O, Be metal, Be in BeO, C in graphite, H in ZrH, Zr in ZrH, liquid ortho-hydrogen, liquid para-hydrogen, liquid ortho-deuterium, liquid para-deuterium liquid methane, and solid methane.

MacFarlane, R.E.

1994-03-01T23:59:59.000Z

157

Effect of Subgrid Heterogeneity on Scaling Geochemical and Biogeochemical Reactions: A Case of U(VI) Desorption  

SciTech Connect (OSTI)

The effect of subgrid heterogeneity in sediment properties on the rate of uranyl[U(VI)] desorption was investigated using a sediment collected from the US Department of Energy Hanford site. The sediment was sieved into 7 grain size fractions that each exhibited different U(VI) desorption properties. Six columns were assembled using the sediment with its grain size fractions arranged in different spatial configurations to mimic subgrid heterogeneity in reactive transport properties. The apparent rate of U(VI) desorption varied significantly in the columns. Those columns with sediment structures leading to preferential transport had much lower rates of U(VI) desorption than those with relatively homogeneous transport. Modeling analysis indicated that the U(VI) desorption model and parameters characterized from well-mixed reactors significantly over-predicted the measured U(VI) desorption in the columns with preferential transport. A dual domain model, which operationally separates reactive transport properties into two subgrid domains improved the predictions significantly. A similar effect of subgrid heterogeneity, albeit at a less degree, was observed for denitrification, which also occurred in the columns. The results imply that subgrid heterogeneity is an important consideration in extrapolating reaction rates from the laboratory to field.

Liu, Chongxuan; Shang, Jianying; Shan, Huimei; Zachara, John M.

2014-02-04T23:59:59.000Z

158

Enhanced photocatalytic efficiency in zirconia buffered n-NiO/p-NiO single crystalline heterostructures by nanosecond laser treatment  

SciTech Connect (OSTI)

We report the formation of NiO based single crystalline p-n junctions with enhanced photocatalytic activity induced by pulsed laser irradiation. The NiO epilayers were grown on Si(001) substrates buffered with cubic yttria-stabilized zirconia (c-YSZ) by using pulsed laser deposition. The NiO/c-YSZ/Si heterostructures were subsequently laser treated by 5 pulses of KrF excimer laser (pulse duration = 25 Multiplication-Sign 10{sup -9} s) at lower energies. Microstructural studies, conducted by X-ray diffraction ({theta}-2{theta} and {phi} techniques) and high resolution transmission electron microscope, showed a cube-on-cube epitaxial relationship at the c-YSZ/Si interface; the epitaxial relationship across the NiO/c-YSZ interface was established as NiO<111 > Double-Vertical-Line Double-Vertical-Line c-YSZ<001> and in-plane NiO<110> Double-Vertical-Line Double-Vertical-Line c-YSZ<100>. Electron microscopy studies showed that the interface between the laser annealed and the pristine region as well as the NiO/c-YSZ interface was atomically sharp and crystallographically continuous. The formation of point defects, namely oxygen vacancies and NiO, due to the coupling of the laser photons with the NiO epilayers was confirmed by XPS. The p-type electrical characteristics of the pristine NiO epilayers turned to an n-type behavior and the electrical conductivity was increased by one order of magnitude after laser treatment. Photocatalytic activity of the pristine (p-NiO/c-YSZ/Si) and the laser-annealed (n-NiO/p-NiO/c-YSZ/Si) heterostructures were assessed by measuring the decomposition rate of 4-chlorophenol under UV light. The photocatalytic reaction rate constants were determined to be 0.0059 and 0.0092 min{sup -1} for the as-deposited and the laser-treated samples, respectively. The enhanced photocatalytic efficiency was attributed to the suppressed charge carrier recombination in the NiO based p-n junctions and higher electrical conductivity. Besides, the oxygen vacancies ease the adsorption of 4-chlorophenol, hydroxyl, and water molecules to the surface. Thus, n-NiO/p-NiO single crystalline catalysts can be introduced as a potent candidate to remediate the environmental pollution.

Molaei, R.; Bayati, M. R.; Alipour, H. M.; Nori, S.; Narayan, J. [Department of Materials Science and Engineering, NC State University, EB-1, Raleigh, North Carolina 27695-7907 (United States)] [Department of Materials Science and Engineering, NC State University, EB-1, Raleigh, North Carolina 27695-7907 (United States)

2013-06-21T23:59:59.000Z

159

Formation of a Novel Ordered Ni3Al Surface Structure by Codeposition on NiAl(110)  

SciTech Connect (OSTI)

The formation of a new type of ordered 2D Ni3Al overlayer by low-temperature codeposition on NiAl(110) is demonstrated by kinetic Monte Carlo simulation of a multisite atomistic lattice-gas model with a precise treatment of surface diffusion kinetics. Simultaneous codeposition with 3?1 Ni?Al yields poor ordering at 300 K but well-ordered structures by ?500??K. Sequential codeposition of Ni then Al yields unmixed core-ring nanostructures at 300 K but strong intermixing and ordering by ?500??K.

Han, Yong; Unal, Baris; Evans, James W.

2012-05-23T23:59:59.000Z

160

Paramagnetic neutron scattering from Ni (invited)  

Science Journals Connector (OSTI)

New polarized beammeasurements have been carried out in the paramagnetic phase of 6 0Ni in order to enlarge the (q ?) range previously studied by Steinsvoll e t a l. Magnetic scattering has been detected up to halfway to the zone boundary. The results can be successfully interpreted in terms of a diffusive?type scattering function over an unexpected wide (q ?) range qneutron data are also compared with the predictions of the very recent band model by Callaway. Finally we point out important similarities and differences in the paramagnetic scattering from localized systems such as EuO and itinerant systems and discuss the universality of the paramagnetic scattering function.

P. Bni; G. Shirane

1985-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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161

Effect of Pd on the Ni{sub 2}Si stress relaxation during the Ni-silicide formation at low temperature  

SciTech Connect (OSTI)

The thermally induced solid-state reaction between a 50-nm-thick Ni(6%Pd) layer and a Si(100) substrate was investigated using in situ and simultaneous x-ray diffraction and sheet resistance. The reaction begins with the growth of the stressed {delta}-Ni{sub 2}Si phase, and the transient {theta}-Ni{sub 2}Si. At the end of the {theta}-Ni{sub 2}Si consumption, a NiSi seed is formed. Then, the {delta}-Ni{sub 2}Si relaxation occurs simultaneously with its subsequent growth and the Pd out diffusion from the unreacted Ni(Pd) layer. It is suggested that the driving force for the Pd diffusion out of the metal layer is linked to both the higher solubility of Pd in NiSi compared to Ni{sub 2}Si and to the Ni{sub 2}Si relaxation.

Putero, M.; Mangelinck, D. [Aix-Marseille Univ., IM2NP, Faculte des Sciences de Jerome, F-13397 Marseille (France); CNRS, IM2NP-UMR 7334, Faculte des Sciences de Jerome, F-13397 Marseille (France)

2012-09-10T23:59:59.000Z

162

E-Print Network 3.0 - al-ni-co decagonal quasicrystal Sample...  

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

Summary: of decagonal Al-Ni-Co K. Pussi Department of Electrical Engineering, Lappeenranta University of Technology, P... . EARLIER WORK ON d-Al-Ni-Co STRUCTURES Decagonal...

163

''Bare'' single-particle energies in Ni-56  

E-Print Network [OSTI]

The structure of the low-lying levels in the mirror nuclei Ni-57 and Cu-57 is described within the extended unified model. The problem of single-particle energies in Ni-56 is treated in detail. ''Bare'' single-particle energies are extracted from...

Trache, L.; Kolomiets, A.; Shlomo, S.; Heyde, K.; Dejbakhsh, H.; Gagliardi, Carl A.; Tribble, Robert E.; Zhou, XG; Jacob, VE; Oros, AM.

1996-01-01T23:59:59.000Z

164

Lanthanide Al-Ni base Ericsson cycle magnetic refrigerants  

DOE Patents [OSTI]

A magnetic refrigerant for a magnetic refrigerator using the Ericsson thermodynamic cycle comprises DyAlNi and (Gd{sub 0.54}Er{sub 0.46})AlNi alloys having a relatively constant {Delta}Tmc over a wide temperature range. 16 figs.

Gschneidner, K.A. Jr.; Takeya, Hiroyuki

1995-10-31T23:59:59.000Z

165

Lanthanide Al-Ni base Ericsson cycle magnetic refrigerants  

DOE Patents [OSTI]

A magnetic refrigerant for a magnetic refrigerator using the Ericsson thermodynamic cycle comprises DyAlNi and (Gd.sub.0.54 Er.sub.0.46)AlNi alloys having a relatively constant .DELTA.Tmc over a wide temperature range.

Gschneidner, Jr., Karl A. (Ames, IA); Takeya, Hiroyuki (Ibaraki, JP)

1995-10-31T23:59:59.000Z

166

Phase relations in the system Ni-As  

Science Journals Connector (OSTI)

...n' ' , / / I , 852(N_i,As)+VN',Asz+L+V ima+L+v/IpnncC;rVrlrl+V(NiAs)+NisAsz+V-, , I I// INIs.xAs +mama+ncll Ni,_xAS,+V/i +V +VJ[ Inc+prm+V , , , , , , , .i,, .! , . I0 20 30 40 50 60 70 Weight per...

R. A. Yund

167

Low temperature epitaxial growth of Ge on cube- textured Ni  

SciTech Connect (OSTI)

Quasi- single crystal Ge films were grown on [001]<010> textured Ni substrate at a temperature of 350 oC using an insulating buffer layer of CaF2. A direct deposition of Ge on Ni at 350 oC was shown to alloy with Ni. From x- ray pole figure analysis, it was shown that Ge grew epitaxially with the same orientation as CaF2 and the dispersions in the out- of- plane and in- plane directions were found to be 1.7 0.1o and 6 1o, respectively. In the out- of- plane direction, Ge[111]||CaF2[111]||Ni[001]. In addition, the Ge consisted of four equivalent in- plane oriented domains such that two mutually orthogonal directions: Ge 211 and Ge 011 are parallel to mutually orthogonal directions: Ni 110 and Ni 110 , respectively of the Ni(001) surface. This was shown to be originated from the four equivalent in- plane oriented domains of CaF2 created to minimize the mismatch strain between CaF2 and Ni in those directions.

GIARE, C [Rensselaer Polytechnic Institute (RPI); Palazzo, J [Rensselaer Polytechnic Institute (RPI); Goyal, Amit [ORNL; WANG, G [Rensselaer Polytechnic Institute (RPI); LU, T [Rensselaer Polytechnic Institute (RPI)

2012-01-01T23:59:59.000Z

168

Autocatalytic decomposition of water on Ni(110)  

SciTech Connect (OSTI)

The interaction of water with clean Ni(110) at temperatures between 425 and 770 K has been studied by work function ([Delta][phi]), desorption mass analysis, and low-energy electron diffraction (LEED). Water is observed to dissociate on clean Ni(110), forming adsorbed oxygen and H[sub 2](g) in a process which is itself catalyzed (and hence termed autocatalytic) by the adsorbed oxygen product. Initial dissociation of water is believed to originate on defects where adsorbed oxygen then promotes growth of O (2 [times] 1) islands in a process which becomes self-poisoning in the limit of saturation of the (2 [times] 1) phase (0.5 ML (ML = monolayer)). The growth kinetics indicate the autocatalysis process is most active when the oxygen coverage is 0.1 ML. A statistical theory supported by computer simulation is developed which models the autocatalytic growth kinetics in terms of nucleation of islands along step edges. The temperature dependence of autocatalysis exhibits a maximum at approx. 600 K. This complex temperature dependence is explained in terms of transition-state theory. 25 refs., 10 figs.

Callen, B.W.; Griffiths, K.; Norton, P.R. (Univ. of Western Ontario, London (Canada)); Harrington, D.A. (Univ. of Victoria, British Columbia (Canada))

1992-12-24T23:59:59.000Z

169

Formation of a Novel Ordered Ni3Al Surface Structure by Codeposition on NiAl(110)  

E-Print Network [OSTI]

The formation of a new type of ordered 2D Ni3Al overlayer by low-temperature codeposition on NiAl(110) is demonstrated by kinetic Monte Carlo simulation of a multisite atomistic lattice-gas model with a precise treatment ...

Han, Yong

170

Evaluation of electron capture reaction rates in Ni isotopes in stellar environments  

SciTech Connect (OSTI)

Electron capture rates in Ni isotopes are studied in stellar environments, that is, at high densities and high temperatures during the core-collapse and postbounce explosive nucleosynthesis in supernovae. Reaction rates in {sup 58}Ni and {sup 60}Ni, as well as in {sup 56}Ni, {sup 62}Ni, and {sup 64}Ni, are evaluated by shell-model calculations with the use of a new shell-model Hamiltonian in the fp shell, GXPF1J. While the previous shell-model calculations failed to reproduce the measured peaks of Gamow-Teller strength in {sup 58}Ni and {sup 60}Ni, the present new Hamiltonian is found to reproduce them very well, as well as the capture rates obtained from the observed strengths. Strengths and energies of the Gamow-Teller transitions in {sup 56}Ni, {sup 62}Ni, and {sup 64}Ni are also found to be consistent with the observations.

Suzuki, Toshio [Department of Physics and Graduate School of Integrated Basic Sciences, College of Humanities and Sciences, Nihon University Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550 (Japan); Center for Nuclear Study, University of Tokyo, Hirosawa, Wako-shi, Saitama 351-0198 (Japan); National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Honma, Michio [Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580 (Japan); Mao, Helene [ENSPS, Pole API-Parc d'Innovation, Boulevard Sebastien Brant, BP 10413, F-67412 Illkirch Cedex (France); Otsuka, Takaharu [Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States); Kajino, Toshitaka [National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Deaprtment of Astronomy, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan)

2011-04-15T23:59:59.000Z

171

Advances in Fe(VI) charge storage: Part II. Reversible alkaline super-iron batteries and nonaqueous super-iron batteries  

Science Journals Connector (OSTI)

Reversible thin film Fe(VI/III) cathodic charge/discharge storage in alkaline batteries is presented. Whereas ultra-thin (e.g., 3nm) Fe(VI/III) films exhibit a high degree of reversibility, thicker films are increasingly passive toward the Fe(VI) charge transfer. An extended conductive matrix facilitates a 100-fold enhancement in charge storage for reversible Fe(VI/III) super-iron thin films. The thicker (100s of nanometers) films deposited on extended conductive matrixes composed of high-surface-area Pt, Ti, and Au can sustain high reversibility, which provides the possibility of using Fe(VI) salts as the cathode materials for rechargeable Fe(VI)/metal hydride batteries. Super-iron cathodes can also be discharged in conjunction with a Li anode in nonaqueous media. Optimization of the nonaqueous primary super-iron/Li batteries is summarized. Fe(VI) cathodes are also reversible in nonaqueous electrolyte systems. The charge/discharge process of super-iron cathodes in nonaqueous media involves both the lithiation/delithiation of the active mass and the reduction/oxidation of the Fe(VI/III), while only the thin film Fe(VI/III) electrodes can sustain high reversibility involving the full theoretical capacity in the nonaqueous batteries.

Xingwen Yu; Stuart Licht

2007-01-01T23:59:59.000Z

172

Actes du VI Congrs Latino Amricain de Sociologie Rurale, Sustentabilidad y Democratizacin de las Sociedades Rurales Latinoamericanas , Porto Alegre, Nov 2002.  

E-Print Network [OSTI]

1 Actes du VI Congrès Latino Américain de Sociologie Rurale, « Sustentabilidad y Democratización de

Boyer, Edmond

173

Permeable Reactive Biobarriers for In Situ Cr(VI) Reduction: Bench Scale Tests Using Cellulomonas sp. Strain ES6  

SciTech Connect (OSTI)

Chromate (Cr(VI)) reduction studies were performed in bench scale flow columns using the fermentative subsurface isolate Cellulomonas sp. strain ES6. In these tests, columns packed with either quartz sand or hydrous ferric oxide (HFO)-coated quartz sand, were inoculated with strain ES6 and fed nutrients to stimulate growth before nutrient-free Cr(VI) solutions were injected. Results show that in columns containing quartz sand, a continuous inflow of 2 mg/L Cr(VI) was reduced to below detection limits in the effluent for durations of up to 5.7 residence times after nutrient injection was discontinued proving the ability of strain ES6 to reduce chromate in the absence of an external electron donor. In the HFO-containing columns, Cr(VI) reduction was significantly prolonged and effluent Cr(VI) concentrations remained below detectable levels for periods of up to 66 residence times after nutrient injection was discontinued. Fe was detected in the effluent of the HFO-containing columns throughout the period of Cr(VI) removal indicating that the insoluble Fe(III) bearing solids were being continuously reduced to form soluble Fe(II) resulting in prolonged abiotic Cr(VI) reduction. Thus, growth of Cellulomonas within the soil columns resulted in formation of permeable reactive barriers that could reduce Cr(VI) and Fe(III) for extended periods even in the absence of external electron donors. Other bioremediation systems employing Fe(II)-mediated reactions require a continuous presence of external nutrients to regenerate Fe(II). After depletion of nutrients, contaminant removal within these systems occurs by reaction with surface-associated Fe(II) that can rapidly become inaccessible due to formation of crystalline Fe-minerals or other precipitates. The ability of fermentative organisms like Cellulomonas to reduce metals without continuous nutrient supply in the subsurface offers a viable and economical alternative technology for in situ remediation of Cr(VI)-contaminated groundwater through formation of permeable reactive biobarriers (PRBB).

Sridhar Viamajala; Brent M. Peyton; Robin Gerlach; Vaideeswaran; William A. Apel; James N. Petersen

2008-12-01T23:59:59.000Z

174

Optimizing Cr(VI) and Tc(VII) remediation through nano-scale biomineral engineering  

SciTech Connect (OSTI)

To optimize the production of biomagnetite for the bioremediation of metal oxyanion contaminated waters, the reduction of aqueous Cr(VI) to Cr(III) by two biogenic magnetites and a synthetic magnetite was evaluated under batch and continuous flow conditions. Results indicate that nano-scale biogenic magnetite produced by incubating synthetic schwertmannite powder in cell suspensions of Geobacter sulfurreducens is more efficient at reducing Cr(VI) than either biogenic nano-magnetite produced from a suspension of ferrihydrite 'gel' or synthetic nano-scale Fe{sub 3}O{sub 4} powder. Although X-ray Photoelectron Spectroscopy (XPS) measurements obtained from post-exposure magnetite samples reveal that both Cr(III) and Cr(VI) are associated with nanoparticle surfaces, X-ray Magnetic Circular Dichroism (XMCD) studies indicate that some Cr(III) has replaced octahedrally coordinated Fe in the lattice of the magnetite. Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) measurements of total aqueous Cr in the associated solution phase indicated that, although the majority of Cr(III) was incorporated within or adsorbed to the magnetite samples, a proportion ({approx}10-15 %) was released back into solution. Studies of Tc(VII) uptake by magnetites produced via the different synthesis routes also revealed significant differences between them as regards effectiveness for remediation. In addition, column studies using a {gamma}-camera to obtain real time images of a {sup 99m}Tc(VII) radiotracer were performed to visualize directly the relative performances of the magnetite sorbents against ultra-trace concentrations of metal oxyanion contaminants. Again, the magnetite produced from schwertmannite proved capable of retaining more ({approx}20%) {sup 99m}Tc(VII) than the magnetite produced from ferrihydrite, confirming that biomagnetite production for efficient environmental remediation can be fine-tuned through careful selection of the initial Fe(III) mineral substrate supplied to Fe(III)-reducing bacteria.

Cutting, R. S.; Coker, V. S.; Telling, N. D.; Kimber, R. L.; Pearce, C. I.; Ellis, B.; Lawson, R; van der Laan, G.; Pattrick, R.A.D.; Vaughan, D.J.; Arenholz, E.; Lloyd, J. R.

2009-09-09T23:59:59.000Z

175

Phase equilibria, formation, crystal and electronic structure of ternary compounds in Ti-Ni-Sn and Ti-Ni-Sb ternary systems  

SciTech Connect (OSTI)

The phase equilibria of the Ti-Ni-Sn and Ti-Ni-Sb ternary systems have been studied in the whole concentration range by means of X-ray and EPM analyses at 1073 K and 873 K, respectively. Four ternary intermetallic compounds TiNiSn (MgAgAs-type), TiNi{sub 2-x}Sn (MnCu{sub 2}Al-type), Ti{sub 2}Ni{sub 2}Sn (U{sub 2}Pt{sub 2}Sn-type), and Ti{sub 5}NiSn{sub 3} (Hf{sub 5}CuSn{sub 3}-type) are formed in Ti-Ni-Sn system at 1073 K. The TiNi{sub 2}Sn stannide is characterized by homogeneity in the range of 50-47 at% of Ni. The Ti-Ni-Sb ternary system at 873 K is characterized by formation of three ternary intermetallic compounds, Ti{sub 0.8}NiSb (MgAgAs-type), Ti{sub 5}Ni{sub 0.45}Sb{sub 2.55} (W{sub 5}Si{sub 3}-type), and Ti{sub 5}NiSb{sub 3} (Hf{sub 5}CuSn{sub 3}-type). The solubility of Ni in Ti{sub 0.8}NiSb decreases number of vacancies in Ti site up to Ti{sub 0.91}Ni{sub 1.1}Sb composition. - Graphical abstract: Isothermal section of the Ti-Ni-Sn phase diagram and DOS distribution in hypothetical TiNi{sub 1+x}Sn solid solution. Highlights: Black-Right-Pointing-Pointer Ti-Ni-Sn phase diagram was constructed at 1073 K. Black-Right-Pointing-Pointer Four ternary compounds are formed: TiNiSn, TiNi{sub 2-x}Sn, Ti{sub 2}Ni{sub 2}Sn, and Ti{sub 5}NiSn{sub 3}. Black-Right-Pointing-Pointer Three ternary compounds exist in Ti-Ni-Sb system at 873 K. Black-Right-Pointing-Pointer The TiNi{sub 2}Sb compound is absent.

Romaka, V.V., E-mail: romakav@yahoo.com [Department of Materials Engineering and Applied Physics, Lviv Polytechnic National University, Ustyyanovycha Str. 5, 79013 Lviv (Ukraine); Rogl, P. [Institut fur Physikalische Chemie der Universitat Wien, Wahringerstrabe 42, A-1090 Wien (Austria); Romaka, L.; Stadnyk, Yu. [Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla and Mefodiya Str. 6, 79005 Lviv (Ukraine); Melnychenko, N.; Grytsiv, A.; Falmbigl, M. [Institut fur Physikalische Chemie der Universitat Wien, Wahringerstrabe 42, A-1090 Wien (Austria); Skryabina, N. [Perm State University, Bukireva Str. 15, 614990 Perm (Russian Federation)

2013-01-15T23:59:59.000Z

176

Neptunium(V) and neptunium(VI) solubilities in synthetic brines of interest to the Waste Isolation Pilot Plant (WIPP)  

SciTech Connect (OSTI)

The solubility of Np(V) and Np(VI) has been measured in three synthetic Na-K-Mg-Cl brines in the presence of CO{sub 2}(g). Experiments were prepared from oversaturation by adding an excess of NpO{sub 2}{sup +} or NpO{sub 2}{sup 2+} to the brines and allowing the neptunium solids to precipitate. Vessels were maintained in contact with fixed CO{sub 2}(g) partial pressures at constant pH and 24 {+-} 1 C. Dissolved Np(V) concentrations decreased several orders of magnitude within the first 100 days of the experiment, while dissolved Np(VI) concentrations decreased initially but then remained relatively constant for more than 400 days. The solid phases formed in all experiments were identified by X-ray powder diffraction as KNpO{sub 2}CO{sub 3}{center_dot}xH{sub 2}O(s). Steady state concentrations for Np(V) are similar to those observed for Pu(V) in the same brines under the same conditions, where Pu occurs predominantly as Pu(V). Similarly, steady state concentrations for Np(VI), which was not reduced over a two year period, compare well with measured Pu(VI) concentrations in the same brines before the Pu(VI) was reduced to Pu(V).

Novak, C.F. [Sandia National Labs., Albuquerque, NM (United States); Nitsche, H. [Lawrence Berkeley National Lab., CA (United States). Earth Sciences Div.]|[Forschungszentrum Rossendorf e.V., Dresden (Germany). Inst. fuer Radiochemie; Silber, H.B. [Lawrence Berkeley National Lab., CA (United States). Earth Sciences Div.]|[San Jose State Univ., CA (United States). Chemistry Dept.] [and others

1996-12-31T23:59:59.000Z

177

COMPUTATIONAL MECHANICS WCCM VI in conjunction with APCOM'04, Sept. 5-10, Beijing, China  

E-Print Network [OSTI]

different length scales into one model are developed. Without any ambitions for completeness, let us mention. As an application, we present the results of the numerical simulation of a Ni-Al alloy. The potential energy on an expansion of the macroscopic deformation function y and leads to a description of the potential energy

Bebendorf, Mario

178

COMPUTATIONAL MECHANICS WCCM VI in conjunction with APCOM'04, Sept. 510, Beijing, China  

E-Print Network [OSTI]

, techniques to combine two or more different length scales into one model are developed. Without any ambitions. As an application, we present the results of the numerical simulation of a Ni­Al alloy. The potential energy on an expansion of the macroscopic deformation function y and leads to a description of the potential energy

Bebendorf, Mario

179

Telescope Guiding with a HyViSI H2RG Used in Guide Mode  

SciTech Connect (OSTI)

We report on long exposure results obtained with a Teledyne HyViSI H2RG detector operating in guide mode. The sensor simultaneously obtained nearly seeing-limited data while also guiding the Kitt Peak 2.1 m telescope. Results from unguided and guided operation are presented and used to place lower limits on flux/fluence values for accurate centroid measurements. We also report on significant noise reduction obtained in recent laboratory measurements that should further improve guiding capability with higher magnitude stars.

Simms, Lance M.; /SLAC; Figerb, Donald F.; Hanold, Brandon J.; /Rochester Inst. Tech.; Kahn, Steven M.; Gilmore, D.Kirk; /SLAC

2010-06-04T23:59:59.000Z

180

First use of a HyViSI H4RG for Astronomical Observations  

SciTech Connect (OSTI)

We present the first astronomical results from a 4K2 Hybrid Visible Silicon PIN array detector (HyViSI) read out with the Teledyne Scientific and Imaging SIDECAR ASIC. These results include observations of astronomical standards and photometric measurements using the 2.1m KPNO telescope. We also report results from a test program in the Rochester Imaging Detector Laboratory (RIDL), including: read noise, dark current, linearity, gain, well depth, quantum efficiency, and substrate voltage effects. Lastly, we highlight results from operation of the detector in window read out mode and discuss its potential role for focusing, image correction, and use as a telescope guide camera.

Simms, Lance M.; /SLAC; Figer, Donald F.; Hanold, Brandon J.; Kerr, Daniel J.; /Rochester Imaging Lab.; Gilmore, D.Kirk; Kahn, Steven M.; /SLAC; Tyson, J.Anthony; /UC,

2007-09-25T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

Magnetized Bianchi Type $VI_{0}$ Barotropic Massive String Universe with Decaying Vacuum Energy Density $?$  

E-Print Network [OSTI]

Bianchi type $VI_{0}$ massive string cosmological models using the technique given by Letelier (1983) with magnetic field are investigated. To get the deterministic models, we assume that the expansion ($\\theta$) in the model is proportional to the shear ($\\sigma$) and also the fluid obeys the barotropic equation of state. It was found that vacuum energy density $\\Lambda \\propto \\frac{1}{t^{2}}$ which matches with natural units. The behaviour of the models from physical and geometrical aspects in presence and absence of magnetic field is also discussed.

Anirudh Pradhan; Raj Bali

2008-05-22T23:59:59.000Z

182

Geometric and Electronic Structures of the Ni(I) and Methyl-Ni(III)  

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

9 9 Geometric and Electronic Structures of the Ni(I) and Methyl-Ni(III) Intermediates of Methyl-Coenzyme M Reductase Methyl-coenzyme M reductase (MCR) from methanogenic archaea catalyzes the terminal step in biological methane synthesis. Using coenzyme B (CoBSH) as the two-electron donor, MCR reduces methyl-coenzyme M (methyl-SCoM) to form methane and the heterodisulfide product, CoBS-SCoM. MCR contains an essential redox active nickel tetrapyrrolic cofactor called coenzyme F430 at its active site, which is active in the reduced Ni(I) state (MCRred1). All of the biologically generated methane, amounting to 1 billion tons per annum globally, is formed by MCR. Furthermore, recent evidence indicates that anaerobic methane oxidation is also catalyzed by MCR and occurs by a reversal of the methane synthesis reaction. Methane is a potent greenhouse gas, trapping 20 times more heat than CO2. In addition, methane is also an important and clean fuel as it produced the least amount of CO2 per unit of heat released. Thus, it is critically important to understand the mechanism of formation of the smallest hydrocarbon in nature.

183

Graphene Monolayer Rotation on Ni(111) Facilities Bilayer Graphene Growth  

SciTech Connect (OSTI)

Synthesis of bilayer graphene by chemical vapor deposition is of importance for graphene-based field effect devices. Here, we demonstrate that bilayer graphene preferentially grows by carbon-segregation under graphene sheets that are rotated relative to a Ni(111) substrate. Rotated graphene monolayer films can be synthesized at growth temperatures above 650 C on a Ni(111) thin-film. The segregated second graphene layer is in registry with the Ni(111) substrate and this suppresses further C-segregation, effectively self-limiting graphene formation to two layers.

Batzill M.; Sutter P.; Dahal, A.; Addou, R.

2012-06-11T23:59:59.000Z

184

On the road to doubly-magic {sup 48}Ni  

SciTech Connect (OSTI)

A relativistic primary beam of {sup 58}Ni from the SIS synchrotron at GSI was used to produce proton-rich isotopes in the titanium-to-nickel region by projectile fragmention at the FRS. We report here on the first observation of the T{sub z}=-7/2 nuclei {sup 45}Fe and {sup 49}Ni. In addition, the new isotope {sup 42}Cr (T{sub z}=-3) was identified. This opens the route to the yet unobserved doubly-magic nucleus {sup 48}Ni.

Blank, B.; Czajkowski, S.; Davi, F.; Del Moral, R.; Dufour, J. P.; Fleury, A.; Marchand, C.; Pravikoff, M. S. [Centre d'Etudes Nucleaires de Bordeaux-Gradignan, F-33175 Gradignan Cedex (France); Benlliure, J.; Boue, F.; Collatz, R.; Heinz, A.; Hellstroem, M.; Hu, Z.; Roeckl, E.; Shibata, M.; Suemmerer, K. [Gesellschaft fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany); Lewitowicz, M. [Grand Accelerateur National des Ions Lourds, B.P. 5027, F-14021 Caen Cedex (France); Janas, Z.; Karny, M. [Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Hoza 69 (Poland)] (and others)

1998-12-21T23:59:59.000Z

185

Middle distillate hydrotreatment zeolite catalysts containing Pt/Pd or Ni  

E-Print Network [OSTI]

A study on middle distillate hydrotreatment zeolite catalysts containing Pt/Pd and/or Ni was performed. The effect of the addition of the corresponding CoMo, CoMoPd, CoMoPtPd and CoMoNi in PdNiPt-zeolite, Pt-zeolite, Ni-zeolite, and Pd...

Marin-Rosas, Celia

2009-05-15T23:59:59.000Z

186

Uranium (VI)Bis(imido) chalcogenate complexes:synthesis and density functional theory analysis  

SciTech Connect (OSTI)

Bis(imido) uranium(VI) trans- and cis-dichalcogenate complexes with the general formula U(NtBu)2(EAr)2(OPPh3)2 (EAr = O-2-tBuC6H4, SPh, SePh, TePh) and U(NtBu)2(EAr)2(R2bpy) (EAr = SPh, SePh, TePh) (R2bpy = 4,4'-disubstituted-2,2'-bipyridyl, R = Me, tBu) have been prepared. This family of complexes includes the first reported monodentate selenolate and tellurolate complexes of uranium(VI). Density functional theory calculations show that covalent interactions in the U-E bond increase in the trans-dichalcogenate series U(NtBu)2(EAr)2(OPPh3)2 as the size of the chalcogenate donor increases and that both 5f and 6d orbital participation is important in the M-E bonds of U-S, U-Se, and U-Te complexes.

Spencer, Liam P [Los Alamos National Laboratory; Batista, Enrique R [Los Alamos National Laboratory; Boncella, James M [Los Alamos National Laboratory; Yang, Ping [Los Alamos National Laboratory; Scott, Brian L [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

187

Compared performances of ENDF/B-VI and JEF-2.2 for MOX core physics  

SciTech Connect (OSTI)

The United States is currently evaluating the use of mixed-oxide (MOX) fuel in commercial light water reactors for reducing weapons-grade Pu stockpiles. The design and licensing processes will require that the validity of the nuclear data libraries and codes used in the effort be demonstrated. Unfortunately, there are only a very limited number of relatively old and nonrepresentative integral experiments freely available to the US programs. This lack of adequate experimental data can be partially remediated by comparing the results of well-validated European codes with the results of candidate US codes. The authors have compared the performances of the JEF-2.2 and ENDF/B-VI.4 libraries for a series of benchmarks for k{sub eff}, void worth, and pin power distributions. Note that JEF-2.2 has been extensively validated for MOX applications. To obtain systematic comparisons between JEF-2.2 and ENDF/B-VI results, the two libraries were implemented with the same processing code options in two independent code systems: (1) VIM, a continuous-energy Monte Carlo code developed at Argonne National Laboratory, with its own processing codes independent of NJOY; and (2) DRAGON, a two-dimensional lattice code developed at Ecole Polytechnique de Montreal. A standard 172-energy-group structure was used in the NJOY processing code.

Finck, P.J.; Laurin-Kovitz, K.; Palmiotti, G.; Stenberg, C. [Argonne National Lab., IL (United States)

1998-12-31T23:59:59.000Z

188

Ni(NiO)/single-walled carbon nanotubes composite: Synthesis of electro-deposition, gas sensing property for NO gas and density functional theory calculation  

SciTech Connect (OSTI)

Graphical abstract: The Ni(NiO)/semiconducting single-walled carbon nanotubes composite collected from the cathode after electro-deposition shows a high sensitivity to low-concentration NO gas at room temperature (18 C). Display Omitted Highlights: ? Ni(NiO) nanoparticles were deposited on semiconducting SWCNTs by electro-deposition. ? Ni(NiO)/semiconducting SWCNTs film shows a high sensitivity to NO gas at 18 C. ?Theoretical calculation reveals electron transfer from SWCNTs to NO via Ni. -- Abstract: Single-walled carbon nanotubes which contains metallic SWCNTs (m-SWCNTs) and semiconducting SWCNTs (s-SWCNTs) have been obtained under electric arc discharge. Their separation can be effectively achieved by the electro-deposition method. The Ni(NiO)/s-SWCNTs composite was found on cathode where Ni was partially oxidized to NiO at ambient condition with Ni(NiO) nanoparticles deposited uniformly on the bundles of SWCNTs. These results were confirmed by Raman spectra, transmission electron microscopy (TEM), scanning electron microscopy (SEM), UVvisNIR and TG characterizations. Furthermore, investigation of the gas sensing property of Ni(NiO)/s-SWCNTs composite film to NO gas at 18 C demonstrated the sensitivity was approximately 5% at the concentration of 97 ppb. Moreover, density functional theory (DFT) calculations were performed to explore the sensing mechanism which suggested the adsorption of NO molecules onto the composite through NNi interaction as well as the proposition of electron transfer mechanisms from SWCNTs to NO via the Ni medium.

Li, Li; Zhang, Guo; Chen, Lei [Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion, College of Heilongjiang Province, Heilongjiang University, Harbin 150080 (China)] [Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion, College of Heilongjiang Province, Heilongjiang University, Harbin 150080 (China); Bi, Hong-Mei [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)] [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China); Shi, Ke-Ying, E-mail: shikeying2008@yahoo.cn [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)] [Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)

2013-02-15T23:59:59.000Z

189

The stellar (n,gamma) cross section of 62Ni  

E-Print Network [OSTI]

The 62Ni(n,gamma)63Ni(t_1/2=100+-2 yrs) reaction plays an important role in the control of the flow path of the slow neutron-capture (s-) nucleosynthesis process. We have measured for the first time the total cross section of this reaction for a quasi-Maxwellian (kT = 25 keV) neutron flux. The measurement was performed by fast-neutron activation, combined with accelerator mass spectrometry to detect directly the 63Ni product nuclei. The experimental value of 28.4+-2.8 mb, fairly consistent with a recent theoretical estimate, affects the calculated net yield of 62Ni itself and the whole distribution of nuclei with 62

190

Transverse acoustic actuation of Ni-Mn-Ga single crystals  

E-Print Network [OSTI]

Two methods for the transverse acoustic actuation of {110}-cut Ni-Mn-Ga single crystals are discussed. In this actuation mode, crystals are used that have the {110}- type twinning planes parallel to the base of the crystal. ...

Simon, Jesse Matthew

2007-01-01T23:59:59.000Z

191

Fr skulares Gleichgewicht gilt: bzw. Ai = iNi  

E-Print Network [OSTI]

Potts 1987 #12;Für säkulares Gleichgewicht gilt: 1N1 = 2N2 A1 = A2 bzw. Ai = iNi z. B. (230Th/238U

Siebel, Wolfgang

192

Thermal behavior simulation of Ni/MH battery  

Science Journals Connector (OSTI)

Thermal behavior of overcharged Ni/MH battery is studied with microcalorimeter. The battery is installed in a special device in ... Quantity of heat and heat capacity of the battery charged at different state of ...

DaHe Li; Kai Yang; Shi Chen; Feng Wu

2009-05-01T23:59:59.000Z

193

Electrodeposition of amorphous matrix Ni-W/Wp̳ composites  

E-Print Network [OSTI]

An amorphous Ni-W alloy matrix was incorporated with W particulate through two types of electrodeposition. The plating bath for the electrodeposition contained nickel sulfate, sodium tungstate, sodium citrate, ammonium ...

Jenket, Donald R. (Donald Robert)

2005-01-01T23:59:59.000Z

194

U.S. DEPARTMENT OF l!Nl!RGY EERE PROJECT MANAGEMENT CENTER NEPA DETERMINATION  

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

NEPA DETERMINATION NEPA DETERMINATION RECIPIENT:Recovery Act: City of North Uttle Rock Page I of3 STATE: AR PROJECT TITLE: Hydroelectric Facility Improvement Project· Automated Intake Cleaning Equipment and Materials Management Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number CIO Number DE-FOA-OOOO120 DE-EEOOO2674 GF~2674..oo2 EE2674 Based on my review of the Information concerning tbe proposed action, as NEPA Compliance Officer (authorized under DOE Order 451.1 A), J have made tbe following determination: CX, EA, EIS APPENDIX AND NUMBER : Description: B5.1 Actions to conserve energy, demonstrate potential energy conservation, and promote energy--efficlency that do not increase the indoor concentrations of potentially harmful substances. These acllons may involve financial and tecl"lOica!

195

Renewable and alteRnative eneRgy Fact Sheet Using Biodiesel Fuel in Your Engine  

E-Print Network [OSTI]

speaking, this usually means combining vegetable oil with methanol in the presence of a cata- lyst (usually for a number of reasons, the most notable one being its lower viscosity. Many large and small producers have begun producing biodiesel, and the fuel can now be found in many parts of Pennsylvania and beyond either

Boyer, Elizabeth W.

196

A modified model for calculating lattice thermal expansion of I{sub 2}-IV-VI{sub 3} and I{sub 3}-V-VI{sub 4} tetrahedral compounds  

SciTech Connect (OSTI)

A general empirical formula was found for calculating lattice thermal expansion for compounds having their properties extended for compound groups having different mean ionicity as well as more than one type of cation atoms with that of different numbers of them such as I{sub 2}-IV-VI{sub 3} and I{sub 3}-V-VI{sub 4}. The difference in the valence electrons for cations and anions in the compound was used to correlate the deviations caused by the compound ionicity. The ionicity effects, which are due to their different numbers for their types, were also added to the correlation equation. In general, the lattice thermal expansion for a compound semiconductor can be calculated from a relation containing melting point, mean atomic distance and number of valence electrons for the atoms forming the compound. The mean ionicity for the group compounds forming I{sub 2}-IV-VI{sub 3} was found to be 0.323 and 0.785 for the ternary group compounds of I{sub 3}-V-VI{sub 4}.

Omar, M.S. [Department of Physics, College of Science, University of Salahaddin, Arbil, Kurdistan (Iraq)]. E-mail: dr_m_s_omar@yahoo.com

2007-05-03T23:59:59.000Z

197

High-temperature phase stability and tribological properties of laser clad Mo{sub 2}Ni{sub 3}Si/NiSi metal silicide coatings  

SciTech Connect (OSTI)

Mo{sub 2}Ni{sub 3}Si/NiSi wear-resistant metal silicide composite coatings consisting of Mo{sub 2}Ni{sub 3}Si primary dendrite and interdendritic Mo{sub 2}Ni{sub 3}Si/NiSi eutectic were fabricated on substrate of an austenitic stainless steel AISI321 by laser cladding using Ni-Mo-Si elemental powder blends. The high-temperature structural stability of the coating was evaluated by aging at 800 deg. C for 1-50 h. High-temperature sliding wear resistance of the as-laser clad and aged coatings was evaluated at 600 deg. C. Results indicate that the Mo{sub 2}Ni{sub 3}Si/NiSi metal silicides coating has excellent high temperature phase stability. No phase transformation except the dissolution of the eutectic Mo{sub 2}Ni{sub 3}Si and the corresponding growth of the Mo{sub 2}Ni{sub 3}Si primary dendrite and no elemental diffusion from the coating into the substrate were detected after aging the coating at 800 deg. C for 50 h. Aging of the coating at 800 deg. C leads to gradual dissolution of the interdendritic eutectic Mo{sub 2}Ni{sub 3}Si and subsequent formation of a dual-phase structure with equiaxed Mo{sub 2}Ni{sub 3}Si primary grains distributed in the NiSi single-phase matrix. Because of the strong covalent-dominated atomic bonds and high volume fraction of the ternary metal silicide Mo{sub 2}Ni{sub 3}Si, both the original and the aged Mo{sub 2}Ni{sub 3}Si/NiSi coating has excellent wear resistance under pin-on-disc high-temperature sliding wear test conditions, although hardness of the aged coating is slightly lower than that of the as-clad coating.

Lu, X.D. [Laboratory of Laser Materials Processing and Surface Engineering, School of Materials Science and Engineering, Beihang University (China); Wang, H.M. [Laboratory of Laser Materials Processing and Surface Engineering, School of Materials Science and Engineering, Beihang University (China)]. E-mail: wanghuaming@263.net

2004-10-18T23:59:59.000Z

198

Shape memory behavior of ultrafine grained NiTi and TiNiPd shape memory alloys  

E-Print Network [OSTI]

The cyclic instability in shape memory characteristics of NiTi-based shape memory alloys (SMAs), such as transformation temperatures, transformation and irrecoverable strains and transformation hysteresis upon thermal and mechanical cycling limits...

Kockar, Benat

2009-05-15T23:59:59.000Z

199

The wetting behavior of NiAl and NiPtAl on polycrystalline alumina  

SciTech Connect (OSTI)

In order to understand the beneficial effect of Pt on the adherence of thermally grown alumina scales, sessile drop experiments were performed to study the wetting of poly-crystalline alumina by nickel-aluminum alloys with or without platinum addition where the amount of Pt ranged from 2.4 to 10 at.%. Subsequent interfacial structure was evaluated using atomic force microscopy. Platinum addition enhances the wettability of NiAl alloys on alumina, reduces the oxide/alloy interface energy and increases the interfacial mass transport rates.

Saiz, Eduardo; Gauffier, Antoine; Saiz, Eduardo; Tomsia, Antoni P.; Hou, Peggy Y.

2007-07-01T23:59:59.000Z

200

Electronic structure mechanism of spin-polarized electron transport in a NiC60Ni system  

E-Print Network [OSTI]

between Ni leads. The tunnel current has a much higher magnitude when Ni is bonded to hole sites (H6, H5) than at bridge sites (B66, B56) of the fullerene cage. Furthermore, the magnitude of junction. For example, the B66 site is the bridge site over a C@C double bond, the B56 site is the bridge site over a C

Pandey, Ravi

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


201

Sol-gel-derived NiO/NiAl{sub 2}O{sub 4} oxygen carriers for chemical-looping combustion by coal char  

SciTech Connect (OSTI)

This paper focuses on the investigation of Ni-based oxygen carriers for CLC by coal char. First, Al(OC{sub 3}H{sub 7}){sub 3} and Ni(NO{sub 3}){sub 2} are selected as the main raw materials to prepare sol-gel-derived NiO/NiAl{sub 2}O{sub 4} oxygen carriers. The oxygen carrier with a mass content of 60% NiO, a sintering temperature of 1300{sup o}C, and a sintering time of 6 h performs comparatively well. Second, the reduction reaction of the NiO/NiAl{sub 2}O{sub 4} oxygen carriers with char and the circular reduction/oxidation reactions of the NiO/NiAl{sub 2}O{sub 4} oxygen carriers with char/air or hydrogen/air are carried out in a thermogravimetric analysis (TGA) instrument to investigate the reactivities and chemical life of the prepared NiO/NiAl{sub 2}O{sub 4} oxygen carriers. The experimental results show that (a) when the TGA temperature is higher than 850{sup o}C, NiO/NiAl{sub 2}O{sub 4} starts to react with coal char rapidly, which indicates that CLC of coal char using NiO/NiAl{sub 2}O{sub 4} as oxygen carriers is a feasible technology of energy utilization in principle; (b) NiO/NiAl{sub 2}O{sub 4}, which maintains its activity over single-cycle reduction/oxidation reactions with char/air or multiple-cycle reduction/oxidation reactions with hydrogen/air, exhibits extremely good recyclablity; (c) the porous beehive structure of the NiO/NiAl{sub 2}O{sub 4} particle is maintained, and the sintering behavior between different particles is not observed during cyclic studies. Those experimental results prove the sol-gel-derived oxygen carrier NiO/NiAl{sub 2}O{sub 4} is capable of being used in chemical-looping combustion fueled by coal char or H{sub 2}. 51 refs., 5 figs., 5 tabs.

Haibo Zhao; Liming Liu; Baowen Wang; Di Xu; Linlin Jiang; Chuguang Zheng [Huazhong University of Science and Technology, Wuhan (China). State Key Laboratory of Coal Combustion

2008-03-15T23:59:59.000Z

202

6999Federal Register / Vol. 71, No. 28 / Friday, February 10, 2006 / Proposed Rules vi. Federal Rules That May Duplicate,  

E-Print Network [OSTI]

March 9, 2006. ADDRESSES: The hearing will be in room 154 of the U.S. Federal Office Building, 222 W. 7 for submitting comments. · Mail: P. O Box 21668, Juneau, AK 99802 · Hand delivery to the Federal Building : 709 W6999Federal Register / Vol. 71, No. 28 / Friday, February 10, 2006 / Proposed Rules vi. Federal

203

VI Simpsio Brasileiro de Solos No Saturados 2007/ Salvador-Bahia 321 Estimation of the Hydraulic Conductivity Function of Unsaturated  

E-Print Network [OSTI]

VI Simpósio Brasileiro de Solos Não Saturados 2007/ Salvador-Bahia 321 Estimation of the Hydraulic Simpósio Brasileiro de Solos Não Saturados 2007/ Salvador-Bahia 1.2 Prediction of the K-function Early

Zornberg, Jorge G.

204

Complexation of U(VI) with 1-Hydroxyethane-1,1-diphosphonicAcid (HEDPA) in Acidic to Basic Solutions  

SciTech Connect (OSTI)

Complexation of U(VI) with 1-hydroxyethane-1,1-diphosphonic acid (HEDPA) in acidic to basic solutions has been studied with multiple techniques. A number of 1:1 (UO{sub 2}H{sub 3}L), 1:2 (UO{sub 2}H{sub j}L{sub 2} where j = 4, 3, 2, 1, 0 and -1) and 2:2 ((UO{sub 2}){sub 2}H{sub j}L{sub 2} where j = 1, 0 and -1) complexes form, but the 1:2 complexes are the major species in a wide pH range. Thermodynamic parameters (formation constants, enthalpy and entropy of complexation) were determined by potentiometry and calorimetry. Data indicate that the complexation of U(VI) with HEDPA is exothermic, favored by the enthalpy of complexation. This is in contrast to the complexation of U(VI) with dicarboxylic acids in which the enthalpy term usually is unfavorable. Results from electrospray ionization mass spectrometry (ESI-MS) and {sup 31}P NMR have confirmed the presence of 1:1, 1:2 and 2:2 U(VI)-HEDPA complexes.

Reed, W A; Rao, L; Zanonato, P; Garnov, A; Powell, B A; Nash, K L

2007-01-24T23:59:59.000Z

205

Enumeration and Characterization of Iron(III)-Reducing Microbial Communities from Acidic Subsurface Sediments Contaminated with Uranium(VI)  

Science Journals Connector (OSTI)

...bioremediation potential in uranium-contaminated subsurface...reduced. Once nitrate is depleted, U(VI) and Fe(III...bacteria, a study in a uranium-contaminated mill tailing...sludge. American Public Health Association, Washington...detection of trace levels of uranium by laser-induced kinetic...

Lainie Petrie; Nadia N. North; Sherry L. Dollhopf; David L. Balkwill; Joel E. Kostka

2003-12-01T23:59:59.000Z

206

OFFICE OF THE GOVERNOR GOVERNMENT HOUSE Charlotte Amalie, V.I. 00802  

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

GOVERNMENT HOUSE GOVERNMENT HOUSE Charlotte Amalie, V.I. 00802 340-774-0001 March 4,2009 The Honorable Steven Chu Secretary U.S. Department of Energy 1000 Independence Avenue, S . W. Washington, D.C. 20585 Re: State Energy Program Assurances Dear Secretary Chu: As a condition of receiving our State share of the $3.1 billion funding for the State Energy Program (SEP) under the American Recovery and Reinvestment Act of 2009 (ARRA), P.L. 11 1-5, I am providing the following assurances. I have written to the chairman of our Public Service Commission and requested that it consider additional actions to promote energy efficiency, consistent with the statutory requirements set forth in the ARRA and its obligations to maintain just and reasonable rates, while protecting the public. I have also written to the

207

Calculation of the electron structure of vacancies and their compensated states in III-VI semiconductors  

SciTech Connect (OSTI)

The Green's functions theory and the bond-orbital model are used as a basis for calculations of the electron structure of local defects-specifically, vacancies and their compensated states in III-VI semiconductors. The energy levels in the band gap are established, and the changes induced in the electron densities in the GaS, GaSe, and InSe semiconductors by anion and cation vacancies and their compensated states are calculated. It is established that, if a vacancy is compensated by an atom of an element from the same subgroup with the same tetrahedral coordination and if the ionic radius of the compensating atom is smaller than that of the substituted atom, the local levels formed by the vacancy completely disappear. It is shown that this mechanism of compensation of vacancies provides a means not only for recovering the parameters of the crystal, but for improving the characteristics of the crystal as well.

Mehrabova, M. A., E-mail: Mehrabova@mail.ru; Madatov, R. S. [Azerbaijan National Academy of Sciences, Institute of Radiation Problems (Azerbaijan)

2011-08-15T23:59:59.000Z

208

Radiation cooling and gain calculation for C VI 182 A line in C/Se plasma  

SciTech Connect (OSTI)

A model is developed which is capable of describing the evolution of gain resulting from both rapid radiative and expansion cooling of a recombining, freely expanding plasma. It is demonstrated for the particular case of a carbon/selenium plasma that the cooling rate which leads to optimal gain can be achieved by adjusting the admixture of an efficiently radiating material (selenium) in the gain medium (carbon). Comparison is made to a recent observation of gain in a recent NRL/Rochester experiment with carbon/selenium plasma for the n = 3 ..-->.. 2 transition in C VI occurring at 182 A. The predicted maximum gain is approx.10 cm/sup -1/, as compared to observation of 2 to 3 cm/sup -1/.

Nam, C.H.; Valeo, E.; Suckewer, S.; Feldman, U.

1986-04-01T23:59:59.000Z

209

Microbial Reductive Transformation of Phyllosilicate Fe(III) and U(VI) in Fluvial Subsurface Sediments  

Science Journals Connector (OSTI)

X-ray absorption spectroscopy of bioreduced sediments indicated that 6777% of the U signal was U(VI), probably as an adsorbed species associated with a new or modified reactive mineral phase. ... This analysis grouped the phylogeny of HF sediment-associated organisms into 14 different phylotypes including members of Proteobacteria (classes Beta-, Delta-, and Gamma-proteobacteria) and Firmicutes (class Clostridia) (Table S5, Figure 4A and B). ... Although the impacts of nutrient inputs from river water intrusion, recharge through the vadose zone, or even detrital sedimentary organic matter on microbial activities in shallow aquifers are not understood, such sources may contribute to ephemeral bursts or localized regions of microbial activity described as hot moments and hot spots. ...

Ji-Hoon Lee; James K. Fredrickson; Ravi K. Kukkadapu; Maxim I. Boyanov; Kenneth M. Kemner; Xueju Lin; David W. Kennedy; Bruce N. Bjornstad; Allan E. Konopka; Dean A. Moore; Charles T. Resch; Jerry L. Phillips

2012-03-14T23:59:59.000Z

210

Influence of calcite on uranium(VI) reactive transport in the groundwaterriver mixing zone  

SciTech Connect (OSTI)

Calcite is an important mineral that can affect uranyl reactive transport in subsurface sediments. This study investigated the distribution of calcite and its influence on uranyl adsorption and reactive transport in the groundwater-river mixing zone at US Hanford 300A, Washington State. Simulations using a 2D reactive transport model under field-relevant hydrogeochemical conditions revealed a complex distribution of calcite concentration as a result of dynamic groundwater-river interactions. The calcite concentration distribution in turn affected the spatial and temporal changes in aqueous carbonate, calcium, and pH, which subsequently influenced U(VI) mobility and discharge rates into the river. The results implied that calcite distribution and its concentration dynamics is an important consideration for field characterization, monitoring, and reactive transport prediction.

Ma, Rui; Liu, Chongxuan; Greskowiak, Janek; Prommer, Henning; Zachara, John M.; Zheng, Chunmiao

2014-01-23T23:59:59.000Z

211

Intensity enhancement of O VI ultraviolet emission lines in solar spectra due to opacity  

E-Print Network [OSTI]

Opacity is a property of many plasmas, and it is normally expected that if an emission line in a plasma becomes optically thick, its intensity ratio to that of another transition that remains optically thin should decrease. However, radiative transfer calculations undertaken both by ourselves and others predict that under certain conditions the intensity ratio of an optically thick to thin line can show an increase over the optically thin value, indicating an enhancement in the former. These conditions include the geometry of the emitting plasma and its orientation to the observer. A similar effect can take place between lines of differing optical depth. Previous observational studies have focused on stellar point sources, and here we investigate the spatially-resolved solar atmosphere using measurements of the I(1032 A)/I(1038 A) intensity ratio of O VI in several regions obtained with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) instrument on board the Solar and Heliospheric Observatory (...

Keenan, F P; Madjarska, M S; Rose, S J; Bowler, L A; Britton, J; McCrink, L; Mathioudakis, M

2014-01-01T23:59:59.000Z

212

Coextraction behavior of Tc(VII) and U(VI) by CMPO  

SciTech Connect (OSTI)

The coextraction behavior of technetium(VII) and uranium(VI) from nitric acid solution by n-octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) in the absence or presence of tributyl phosphate (TBP) was investigated. The extraction of technetium was remarkably enhanced in the presence of uranium at less than 0.1M nitric acid concentration, and with the initial concentration ratio of [U]/[Tc] = 50 in the aqueous phase, the distribution coefficient of Tc(VII) at 0.01M nitric acid was about one hundred times greater than that obtained in the absence of uranium. The coextraction of technetium and uranium was presumed to occur due to the same ion exchange mechanism as reported in the Tc-U-TBP system. However, the effect of TBP on this coextraction was not observed in the present study. 17 refs., 8 figs.

Takeuchi, Mitsuo; Tanaka, Satoru; Yamawaki, Michio (Univ. of Tokyo, Ibaraki (Japan)); Tachimori, Shoichi (Japan Atomic Energy Research Inst., Ibaraki (Japan))

1995-01-01T23:59:59.000Z

213

Electronic structure of wurtzite II-VI compound semiconductor cleavage surfaces studied by scanning tunneling microscopy  

Science Journals Connector (OSTI)

We report atomically resolved scanning tunneling microscopy (STM) images of cleavage surfaces of wurtzite II-VI compound semiconductors. CdSe(1120), CdSe(1010), and CdS(1010) were investigated. The STM images confirm a 11 reconstruction for all surfaces. At negative and positive sample voltages the occupied and empty dangling-bond states above anions and cations, respectively, dominate the contrast of the STM images. No states in the band gap were found. The electronic structure of the surface permits the observation of dopant atoms in subsurface layers and thus also cross-sectional scanning tunneling microscopy studies of point defects and heterostructures.

B. Siemens, C. Domke, Ph. Ebert, and K. Urban

1997-11-15T23:59:59.000Z

214

O VI RECOMBINATION LINES IN ULTRAVIOLET AND VISIBLE SPECTRA OF RR TELESCOPII  

SciTech Connect (OSTI)

Nineteen recombination lines of O VI are identified in ultraviolet and visible spectra of the symbiotic nova RR Telescopii at wavelengths between 1122 and 6203 A. Only three of the lines have previously been reported from astronomical spectra, and eight lines have never been reported from either astronomical or laboratory spectra. The lines represent transitions between levels with principal quantum numbers up to 13, and the strongest lines by flux occur at 1124.82, 2070.90, and 3434.66 A, corresponding to transitions 4-5, 5-6, and 6-7. As the lines are produced by recombination onto O VII, they potentially allow O VII emitting regions in astrophysical plasmas to be probed at ultraviolet and visible wavelengths that otherwise can only be studied at X-ray wavelengths.

Young, P. R., E-mail: pyoung9@gmu.edu [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States)

2012-04-10T23:59:59.000Z

215

Analysis of radiation exposure, Task Force RAZOR. Exercise Desert Rock VI, Operation Teapot. Technical report  

SciTech Connect (OSTI)

The radiation dose to Task Force RAZOR personnel participating in Shot Apple II of Operation Teapot, Exercise Desert Rock VI, is reconstructed. Task force personnel were exposed to initial radiation while in their vehicles or in trenches at the time of Apple II detonation. They were also exposed to residual radiation during their subsequent manuever and during an inspection of the equipment display area. The calculated total gamma doses to fully-participating Task Force RAZOR personnel range from about 0.8 rem to 1.8 rem. The highest dose was received by personnel of the armored infantry platoon on right flank nearest ground zero. Internal radiation dose commitments to maximally exposed personnel inside vehicles are estimated to be about 0.4 rem to the thyroid, 0.003 rem to the whole body, and 0.002 rem to the bone.

Edwards, R.; Goetz, J.; Klemm, J.

1983-07-15T23:59:59.000Z

216

The nuclear-weapon states and article VI of the NPT  

SciTech Connect (OSTI)

The Non-Proliferation Treaty rests on a basic bargain between the five declared nuclear-weapon states - the United States, Russia, Britain, France and China and 167 states that do not possess nuclear weapons. In addition, to the arms control and disarmaments commitments in Article VI, the parties pledge in the treaty`s pramble their determination to seek a comprehensive test ban (CTB) and express the understanding that in connection with the treaty on general and complete disarmament the parties should seek the cessation of manufacture of nuclear weapons, the liquidation of all their existing stock piles, and the elimination from national arsenals of nuclear weapons and means of their delivery. The author discusses the status of these agreements and the extent to which they have been fulfilled.

Mendelsohn, J.; Lockwood, D.

1995-03-01T23:59:59.000Z

217

Enhanced control and sensing for the REMOTEC ANDROS Mk VI robot. CRADA final report  

SciTech Connect (OSTI)

This Cooperative Research and Development Agreement (CRADA) between Lockheed Martin Energy Systems, Inc., and REMOTEC, Inc., explored methods of providing operator feedback for various work actions of the ANDROS Mk VI teleoperated robot. In a hazardous environment, an extremely heavy workload seriously degrades the productivity of teleoperated robot operators. This CRADA involved the addition of computer power to the robot along with a variety of sensors and encoders to provide information about the robot`s performance in and relationship to its environment. Software was developed to integrate the sensor and encoder information and provide control input to the robot. ANDROS Mk VI robots are presently used by numerous electric utilities to perform tasks in reactors where substantial exposure to radiation exists, as well as in a variety of other hazardous environments. Further, this platform has potential for use in a number of environmental restoration tasks, such as site survey and detection of hazardous waste materials. The addition of sensors and encoders serves to make the robot easier to manage and permits tasks to be done more safely and inexpensively (due to time saved in the completion of complex remote tasks). Prior research on the automation of mobile platforms with manipulators at Oak Ridge National Laboratory`s Center for Engineering Systems Advanced Research (CESAR, B&R code KC0401030) Laboratory, a BES-supported facility, indicated that this type of enhancement is effective. This CRADA provided such enhancements to a successful working teleoperated robot for the first time. Performance of this CRADA used the CESAR laboratory facilities and expertise developed under BES funding.

Spelt, P.F. [Oak Ridge National Lab., TN (United States); Harvey, H.W. [REMOTEC, Inc., Oak Ridge, TN (United States)

1998-08-01T23:59:59.000Z

218

Characterizing particle-scale equilibrium adsorption and kinetics of uranium(VI) desorption from U-contaminated sediments  

SciTech Connect (OSTI)

Rates of contaminant U(VI) release from individual size fractions of a composite sediment from the seasonally saturated lower vadose zone of the Hanford 300-Area were examined in flow-through batch reactors to maintain quasi-constant chemical conditions. Variability in equilibrium adsorption among the various size fractions was determined in static batch reactors and analyzed using the surface complexation modeling approach. The estimated stoichiometric coefficients of U(VI) surface complexation reactions with respect to pH and carbonate concentrations varied with size fractions. This source of variability significantly increased the uncertainty in U(VI) conditional equilibrium constants over that estimated from experimental errors alone. A minimum difference between conditional equilibrium constants was established in order to evaluate statistically significant differences between sediment adsorption properties. A set of equilibrium and kinetic expressions for cation exchange, calcite dissolution, aerobic respiration, and silica dissolution were incorporated in a reaction-rate model to describe the temporal evolution of solute concentrations observed during the flow-through batch experiments. Parameters in the reaction-rate model, calibrated using experimental data for select size fractions, predicted the changes in solute concentrations for the bulk, <2 mm, sediment sample. Kinetic U(VI) desorption was well described using a multi-rate surface complexation model with an assumed lognormal distribution for the rate constants. The estimated mean and standard deviation were the same for all < 2mm size fractions, but differed in the 2-8mm size fraction. Micropore volumes in the varied size fractions were also similar as assessed using t-plots to analyze N2 desorption data. These findings provide further support for the link between microporosity and particle-scale mass transfer rates controlling kinetic U(VI) adsorption/desorption and for the utility of N2 desorption isotherms for characterizing pore networks that influence mass transfer rates.

Stoliker, Deborah L.; Liu, Chongxuan; Kent, Douglas B.; Zachara, John M.

2013-02-12T23:59:59.000Z

219

Modified Ni-Cu catalysts for ethanol steam reforming  

SciTech Connect (OSTI)

Three Ni-Cu catalysts, having different Cu content, supported on ?-alumina were synthesized by wet co-impregnation method, characterized and tested in the ethanol steam reforming (ESR) reaction. The catalysts were characterized for determination of: total surface area and porosity (N{sub 2} adsorption - desorption using BET and Dollimer Heal methods), Ni surface area (hydrogen chemisorption), crystallinity and Ni crystallites size (X-Ray Diffraction), type of catalytic active centers (Hydrogen Temperature Programmed Reduction). Total surface area and Ni crystallites size are not significantly influenced by the addition of Cu, while Ni surface area is drastically diminished by increasing of Cu concentration. Steam reforming experiments were performed at atmospheric pressure, temperature range 150-350C, and ethanol - water molar ration of 1 at 30, using Ar as carrier gas. Ethanol conversion and hydrogen production increase by the addition of Cu. At 350C there is a direct connection between hydrogen production and Cu concentration. Catalysts deactivation in 24h time on stream was studied by Transmission Electron Microscopy (TEM) and temperature-programmed reduction (TPR) on used catalysts. Coke deposition was observed at all studied temperatures; at 150C amorphous carbon was evidenced, while at 350C crystalline, filamentous carbon is formed.

Dan, M.; Mihet, M.; Almasan, V.; Borodi, G. [National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath Street, 400293, Cluj-Napoca (Romania)] [National Institute for Research and Development of Isotopic and Molecular Technologies, 65-103 Donath Street, 400293, Cluj-Napoca (Romania); Katona, G.; Muresan, L. [Univ. Babes Bolyai, Fac. Chem. and Chem. Eng.,11 Arany Janos, 400028, Cluj-Napoca (Romania)] [Univ. Babes Bolyai, Fac. Chem. and Chem. Eng.,11 Arany Janos, 400028, Cluj-Napoca (Romania); Lazar, M. D., E-mail: diana.lazar@itim-cj.ro [65-103 Donath Street (Romania)

2013-11-13T23:59:59.000Z

220

COINCIDENCES BETWEEN O VI AND O VII LINES: INSIGHTS FROM HIGH-RESOLUTION SIMULATIONS OF THE WARM-HOT INTERGALACTIC MEDIUM  

SciTech Connect (OSTI)

With high-resolution (0.46 h{sup -1} kpc), large-scale, adaptive mesh-refinement Eulerian cosmological hydrodynamic simulations we compute properties of O VI and O VII absorbers from the warm-hot intergalactic medium (WHIM) at z = 0. Our new simulations are in broad agreement with previous simulations with {approx}40% of the intergalactic medium being in the WHIM. Our simulations are in agreement with observed properties of O VI absorbers with respect to the line incidence rate and Doppler-width-column-density relation. It is found that the amount of gas in the WHIM below and above 10{sup 6} K is roughly equal. Strong O VI absorbers are found to be predominantly collisionally ionized. It is found that (61%, 57%, 39%) of O VI absorbers of log N(O VI) cm{sup 2} = (12.5-13, 13-14, > 14) have T < 10{sup 5} K. Cross correlations between galaxies and strong [N(O VI) > 10{sup 14} cm{sup -2}] O VI absorbers on {approx}100-300 kpc scales are suggested as a potential differentiator between collisional ionization and photoionization models. Quantitative prediction is made for the presence of broad and shallow O VI lines that are largely missed by current observations but will be detectable by Cosmic Origins Spectrograph observations. The reported 3{sigma} upper limit on the mean column density of coincidental O VII lines at the location of detected O VI lines by Yao et al. is above our predicted value by a factor of 2.5-4. The claimed observational detection of O VII lines by Nicastro et al., if true, is 2{sigma} above what our simulations predict.

Cen Renyue, E-mail: cen@astro.princeton.edu [Princeton University Observatory, Princeton, NJ 08544 (United States)

2012-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

Similarity of the Surface Reactivity of Hydrous Ferric Oxide and Hematite: Sorption and Redox of U(VI) and Fe(II)  

SciTech Connect (OSTI)

Hydrous Ferric Oxide (HFO) vs. Hematite--Thermodynamically distinctive bulk phases, but the surfaces could be similar due to hydration of the interface. Hypothesis--The surface of HFO is energetically similar to the surface of hematite. Objective--Compare the reactions of HFO and hematite with U(VI) and Fe(II). Experimental--The reactions of interests were (1) preparation of sub-micron hematite, (2) sorption of U(VI), and (3) redox of U(VI) and Fe(II) with HFO or hematite.

Je-Hun Jang; Dempsey, Brian A.; Burgos, William D.; Yeh, George; Roden, Eric

2004-03-17T23:59:59.000Z

222

Bimetallic Fe-Ni Oxygen Carriers for Chemical Looping Combustion  

SciTech Connect (OSTI)

The relative abundance, low cost, and low toxicity of iron make Fe-based oxygen carriers of great interest for chemical looping combustion (CLC), an emerging technology for clean and efficient combustion of fossil and renewable fuels. However, Fe also shows much lower reactivity than other metals (such as Ni and Cu). Here, we demonstrate strong improvement of Fe-based carriers by alloying the metal phase with Ni. Through a combination of carrier synthesis and characterization with thermogravimetric and fixed-bed reactor studies, we demonstrate that the addition of Ni results in a significant enhancement in activity as well as an increase in selectivity for total oxidation. Furthermore, comparing alumina and ceria as support materials highlights the fact that reducible supports can result in a strong increase in oxygen carrier utilization.

Bhavsar, Saurabh; Veser, Goetz

2013-11-06T23:59:59.000Z

223

Superconductivity in SrNi2P2 single crystals  

SciTech Connect (OSTI)

Heat capacity, magnetic susceptibility, and resistivity of SrNi{sub 2}P{sub 2} single crystals are presented, illustrating the structural transition at 325 K, and bulk superconductivity at 1.4 K. The magnitude of {Tc}, fits to the heat capacity data, the small upper critical field H{sub c2} = 390 Oe, and {kappa} = 2.1 suggests a conventional fully gapped superconductor. With applied pressure we find that superconductivity persists into the so-called 'collapsed tetragonal' phase, although the transition temperature is monotonically suppressed with increasing pressure. This argues that reduced dimensionality can be a mechanism for increasing the transition temperatures of layered NiP, as well as layered FeAs and NiAs, superconductors.

Ronning, Filip [Los Alamos National Laboratory; Bauer, Eric D [Los Alamos National Laboratory; Park, Tuscon [Los Alamos National Laboratory; Thompson, Joe D [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

224

Effect of nickel loading on the activity of Ni/ZrO2 for methane steam reforming at low temperature  

Science Journals Connector (OSTI)

The effect of Ni loading on the catalytic activity of Ni/ZrO2 catalyst for methane steam reforming was investigated. The sample containing 15 wt...

Long Q. Nguyen; Leonila C. Abella

2008-04-01T23:59:59.000Z

225

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...

Akin, Erhan

2011-10-21T23:59:59.000Z

226

SciTech Connect: Neutron Scattering of CeNi at the SNS-ORNL:...  

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

Conference: Neutron Scattering of CeNi at the SNS-ORNL: A Preliminary Report Citation Details In-Document Search Title: Neutron Scattering of CeNi at the SNS-ORNL: A Preliminary...

227

Textural Characterization of Pilc Montmorillonite Pillared with Binary Oxides LaNiOx  

Science Journals Connector (OSTI)

Montmorillonite pillared clay was synthesized by intercalation of binuclear complex of the form NiLa(fsaen)NO3 and subsequent calcination at 500C. The binary oxides of the form NiLaOx thus created inside the lay...

S. P. Skaribas; P. J. Pomonis; P. Grange

1993-01-01T23:59:59.000Z

228

E-Print Network 3.0 - alloy fracture cu-ni Sample Search Results  

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

fracture cu-ni Search Powered by Explorit Topic List Advanced Search Sample search results for: alloy fracture cu-ni Page: << < 1 2 3 4 5 > >> 1 Ris-R-1276(EN) Final Report...

229

X-ray absorption spectroscopy at the Ni-K edge in Stackhousia tryonii Bailey hyperaccumulator  

E-Print Network [OSTI]

X-ray absorption spectroscopy at the NiK edge inin vivo by micro x-ray absorption spectroscopy (XAS) at theNiK edge. Both x-ray absorption near edge structure and

Kachenko, A.

2009-01-01T23:59:59.000Z

230

Piezospectroscopic study of substitutional Ni in ZnO  

SciTech Connect (OSTI)

The effect of uniaxial stress on the electronic {sup 3}T{sub 1}(F)?{sup 3}T{sub 2}(F) transitions of Ni{sup 2+} in ZnO at 4216, 4240, and 4247 cm{sup ?1} is investigated by means of Fourier transform IR absorption spectroscopy. A stress Hamiltonian is constructed which accounts for the behavior of these transitions under uniaxial stress. It is shown that the split pattern and polarization properties of these IR absorption lines are consistent with a dynamic Jahn-Teller effect in the {sup 3}T{sub 2}(F) state of Ni.

Lavrov, E. V.; Herklotz, F. [Technische Universitt Dresden, 01062 Dresden (Germany); Kutin, Y. S. [Kazan Federal University, Federal Center of Shared Facilities, 420008 Kazan (Russian Federation)

2014-02-21T23:59:59.000Z

231

Kinetics of Mixed Ni-Al Precipitate Formation on a Soil Clay Fraction  

E-Print Network [OSTI]

Kinetics of Mixed Ni-Al Precipitate Formation on a Soil Clay Fraction D A R R Y L R . R O B E R Management Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland The kinetics of mixed Ni-Al Ni- Al LDH formation. The initial Ni concentration was 3 mM with a solid/solution ratio of 10 g L-1

Sparks, Donald L.

232

Spatially resolved U(VI) partitioning and speciation: Implications for plume scale behavior of contaminant U in the Hanford vadose zone  

E-Print Network [OSTI]

EM/GJ1302- 2006, Stoller Hanford Office, Richland, WA. 2006.characterization of U(VI) in Hanford vadose zone poreUranium Geochemistry at the Hanford Site. Pacific Northwest

Wan, Jiamin

2009-01-01T23:59:59.000Z

233

A Conceptual model of coupled biogeochemical and hydrogeological processes affected by in situ Cr(VI) bioreduction in groundwater at Hanford 100H Site  

E-Print Network [OSTI]

in Groundwater at Hanford 100H Site B.Faybishenko, P.E.Long,Cr(VI) contaminated groundwater at Hanford 100H site. A slowHRC TM ), was injected in Hanford sediments to stimulate

2006-01-01T23:59:59.000Z

234

Structure of high-temperature nickel alloy ZhS36VI for single-crystal blades of high-pressure turbines  

Science Journals Connector (OSTI)

The fine structure, phase composition, and segregation inhomogeneity of carbonless single-crystal rhenium-alloyed alloy ZhS36VI in cast and heat-treated conditions are studied. The structural and phase stabili...

V. P. Kuznetsov; V. P. Lesnikov; E. V. Moroz

2008-03-01T23:59:59.000Z

235

Sequential Extraction Method for Determination of Fe(II/III) and U(IV/ VI) in Suspensions of Iron-Bearing Phyllosilicates and Uranium  

E-Print Network [OSTI]

electron donors to stimulate anaerobic conditions and reduce mobile uranyl (VI) to sparingly soluble uraninite (U(IV)O2(s)).1-3 However, further studies have shown that uraninite can be reoxidized by nitrate,4

Burgos, William

236

Gas Combustion Appliances: Validating VENT-II Vi H. Rapp, Albert Pastor-Perez, Brett C. Singer, and  

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

Predicting Backdrafting and Spillage for Natural-Draft Predicting Backdrafting and Spillage for Natural-Draft Gas Combustion Appliances: Validating VENT-II Vi H. Rapp, Albert Pastor-Perez, Brett C. Singer, and Craig P. Wray Environmental Energy Technologies Division April 2013 In Press as: Vi H. Rapp, Albert Pastor-Perez, Brett C. Singer, and Craig P. Wray. 2013. "Predicting Backdrafting and Spillage for Natural-Draft Gas Combustion Appliances: A Validation of VENT-II". HVAC&R Research, DOI:10.1080/10789669.2013.771948 LBNL-6193E 2 DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof,

237

INVESTIGATION OF NOVEL ALLOY TiC-Ni-Ni3Al FOR SOLID OXIDE FUEL CELL INTERCONNECT APPLICATIONS  

SciTech Connect (OSTI)

Solid oxide fuel cell interconnect materials must meet stringent requirements. Such interconnects must operate at temperatures approaching 800 C while resisting oxidation and reduction, which can occur from the anode and cathode materials and the operating environment. They also must retain their electrical conductivity under these conditions and possess compatible coefficients of thermal expansion as the anode and cathode. Results are presented in this report for fuel cell interconnect candidate materials currently under investigation based upon nano-size titanium carbide (TiC) powders. The TiC is liquid phase sintered with either nickel (Ni) or nickel-aluminide (Ni{sub 3}Al) in varying concentrations. The oxidation resistance of the submicron grain TiC-metal materials is presented as a function weight change versus time at 700 C and 800 C for varying content of metal/intermetallic in the system. Electrical conductivity at 800 C as a function of time is also presented for TiC-Ni to demonstrate the vitality of these materials for interconnect applications. TGA studies showed that the weight gain was 0.8 mg/cm{sup 2} for TiC(30)-Ni(30wt.%) after 100 hours in wet air at 800 C and the weight gain was calculated to be 0.5205 mg/cm{sup 2} for TiC(30)- Ni(10 wt.%) after 100 hours at 700 C and 100 hours at 800 C. At room temperature the electrical conductivity was measured to be 2444 1/[ohm.cm] for TiC-Ni compositions. The electrical conductivities at 800 C in air was recorded to be 19 1/[ohm.cm] after 125 hours. Two identical samples were supplied to PNNL (Dr. Jeff Stevenson) for ASR testing during the pre-decision period and currently they are being tested there. Fabrication, oxidation resistance and electrical conductivity studies indicate that TiC-Ni-Ni{sub 3}Al ternary appears to be a very important system for the development of interconnect composition for solid oxide fuel cells.

Rasit Koc; Geoffrey Swift; Hua Xie

2005-01-25T23:59:59.000Z

238

Shape memory response of ni2mnga and nimncoin magnetic shape memory alloys under compression  

E-Print Network [OSTI]

In this study, the shape memory response of Ni2MnGa and NiMnCoIn magnetic shape memory alloys was observed under compressive stresses. Ni2MnGa is a magnetic shape memory alloy (MSMA) that has been shown to exhibit fully reversible, stressassisted...

Brewer, Andrew Lee

2009-05-15T23:59:59.000Z

239

Oxygen Reduction Activity of PtxNi1-x Alloy Nanoparticles on Multiwall Carbon Nanotubes  

E-Print Network [OSTI]

PtxNi1 - x nanoparticles (Pt:Ni; 1:0, 4:1, 3:1 and 0.7:1) of ~5 nm, were synthesized on carboxylic acid-functionalized multiwall carbon nanotubes (PtxNi1 - x NPs/MWNT). The oxygen reduction reaction (ORR) activity measurements ...

Kim, Junhyung

240

Vacancy-Vacancy Interactions in NiAl Matthew O. Zacate and Gary S. Collins  

E-Print Network [OSTI]

Vacancy-Vacancy Interactions in NiAl Matthew O. Zacate and Gary S. Collins Department of Physics, Washington State University, Pullman, WA 99164, USA Keywords: point defect, vacancy, defect interaction, intermetallic compound, perturbed angular correlation, PAC, NiAl Abstract. Interactions between Ni vacancies

Collins, Gary S.

Note: This page contains sample records for the topic "vi rgi ni" 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

Monopole resonance strengths in Ni-58 and Pb-208  

E-Print Network [OSTI]

Giant monopole resonance strengths were obtained from small angle inelastic alpha scattering on Ni-58 and Pb-208 using deformed potential and folding models. Folding model analyses increase the sum rule strength in both nuclei, with 160% of the E0...

Youngblood, David H.

1997-01-01T23:59:59.000Z

242

Precipitation in 9Ni-12Cr-2Cu maraging steels  

SciTech Connect (OSTI)

Two maraging steels with the compositions 9Ni-12Cr-2Cu-4Mo (wt%) and 9Ni-12Cr-2Cu and with small additions of Al and Ti were investigated using atom probe field ion microscopy. Tomographic atom probe investigations were performed to clarify the spatial distribution of elements in and close to the precipitates. Materials heat treated at 475 C for 5, 25 min, 1, 2, 4 and 400 h were analyzed. Precipitates in the Mo-rich material were observed already after 5 min of aging, while in the material without MO, precipitation started later. In both materials precipitation begins with the formation of Cu-rich particles which work as nucleation sites for a Ni-rich phase of type Ni{sub 3}(Ti,Al). A Mo-rich phase was detected in the Mo-rich steel after 2 h of aging. The distribution of alloying elements in the precipitates, their role in the precipitation process, and the mechanism of hardening in the two materials are discussed.

Stiller, K.; Haettestrand, M. [Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics] [Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Physics; Danoix, F. [Univ. de Rouen, Mont Saint Aignan (France). Lab. de Microscopie Ionique] [Univ. de Rouen, Mont Saint Aignan (France). Lab. de Microscopie Ionique

1998-11-02T23:59:59.000Z

243

Metal-to-Semiconductor Transition in Hexagonal NiS  

Science Journals Connector (OSTI)

Recent electrical resistivity measurements have shown that the hexagonal form of stoichiometric NiS exhibits an abrupt metal-to-semiconductor transition at 264K. Neutron diffraction studies have shown that a first-order paramagnetic-to-antiferromagnetic transition also occurs at 264K. No crystal lattice distortion is observed at the transition nor detected at 4.2K, suggesting that this may be a transition of the kind considered by Adler and Brooks. The measured magnetic moment at 4.2K is 1.660.08 ?? and at 260K it is 150.0.10 ?? indicating that the sublattice magnetization is within 10% of saturation immediately upon ordering. The neutron data also shown that no more than about 1% of the Ni atoms migrate to tetragonal interstitial sites on warming from 4.2K to room temperature. Thus, Ni atom migration apparently plays no part in this transition. The powder magnetic susceptibility is 2.2410-6 emu/g at 300K and is virtually temperature-independent above the transition. ? increases abruptly at 264K by about 15% and exhibits some field-cooling effects. Studies on the compounds NiXS, for X=1.01,0.99,0.97,and0.94 show that excess sulfur lowers the transition temperature.

JOSEPH T. SPARKS and TED KOMOTO

1968-10-01T23:59:59.000Z

244

Directional solidification studies in Ni-Al alloys  

SciTech Connect (OSTI)

Three solid phases are involved in the phase equilibria of the intermetallic compound Ni{sub 3}Al near its melting point, {beta}, {gamma}{prime}(Ni{sub 3}Al), and {gamma}. The generally-accepted phase diagram involves a eutectic reaction between {beta}{prime} and {gamma}, but some recent studies agree with an older diagram due to Schramm, which has a eutectic reaction between the {beta} and {gamma}{prime} phases. The phase equilibria near Ni{sub 3}Al compositions was evaluated using quenched directional solidification experiments, that preserve the microstructures tonned at the solidification front, and using diffusion couple experiments. These experiments show that eutectic forms between {beta} and {gamma}{prime} phases, as in the Schramm diagram. Growth and phase transformations of these three phases are also studied in the directional solidification experiments. Microstructure analysis shows that etching of Ni{sub 3}Al({gamma}{prime}) is very sensitive to small composition variations and crystallographic orientation changes. The eutectic solidification study confirms that the equilibrium eutectic is {gamma}{prime}+{beta}, and that the metastable {gamma}+{beta} eutectic might be also produced in this system according to the impurities, solidification rates, and composition variations.

Lee, Je-hyun

1993-05-01T23:59:59.000Z

245

NTS-2 Ni-H/sub 2/ battery - an update  

SciTech Connect (OSTI)

This paper presents an extensive data base for future Ni-H/sub 2/ spacecraft batteries. End of-discharge (EOD) voltages for the eight eclipse seasons are presented along with long-term pressure data derived from a strain gauge mounted on the dome of a cell. The use of temperature for charge control is also evaluated. 5 refs.

Stockel, J.F.

1981-01-01T23:59:59.000Z

246

Structure of ABC Transporter MsbA in Complex with ATP Vi and  

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

ABC Transporter MsbA ABC Transporter MsbA in Comlex with ATP Vi and Lipopolysaccharide: Implications for Lipid Flipping Christopher L. Reyes and Geoffrey Chang* Department of Molecular Biology, The Scripps Research Institute, 10550 N. Torrey Pines Rd. CB105, La Jolla, CA 92137 ATP-binding cassette (ABC) transporters are integral membrane proteins critical for the transport of a wide variety of substrate molecules across the cell membrane. MsbA, along with human MDR1 P-glycoprotein, are members of the ABC transporter family that have been implicated in multidrug resistance by coupling ATP binding and hydrolysis to substrate transport. This drug efflux results in resistance to antibiotics in microorganisms and resistance to chemotherapeutic drugs in human cancer cells1. Using x-ray diffraction data collected at SSRL Beam Line 11-1 and ALS, we have determined the 4.2 Å x-ray crystal structure of MsbA in complex with transition state mimic ADP, vanadate (an analog of the g phosphate of ATP) and the human immunomodulatory substrate Ra lipopolysaccharide. This structure is the first intact ABC transporter in complex with nucleotide and substrate.

247

Methods for forming thin-film heterojunction solar cells from I-III-VI{sub 2}  

DOE Patents [OSTI]

An improved thin-film, large area solar cell, and methods for forming the same are disclosed, having a relatively high light-to-electrical energy conversion efficiency and characterized in that the cell comprises a p-n type heterojunction formed of: (i) a first semiconductor layer comprising a photovoltaic active material selected from the class of I-III-VI{sub 2} chalcopyrite ternary materials which is vacuum deposited in a thin ``composition-graded`` layer ranging from on the order of about 2.5 microns to about 5.0 microns ({approx_equal}2.5 {mu}m to {approx_equal}5.0 {mu}m) and wherein the lower region of the photovoltaic active material preferably comprises a low resistivity region of p-type semiconductor material having a superimposed region of relatively high resistivity, transient n-type semiconductor material defining a transient p-n homojunction; and (ii) a second semiconductor layer comprising a low resistivity n-type semiconductor material; wherein interdiffusion occurs (a) between the elemental constituents of the two discrete juxtaposed regions of the first semiconductor layer defining a transient p-n homojunction layer, and (b) between the transient n-type material in the first semiconductor layer and the second n-type semiconductor layer. 16 figs.

Mickelsen, R.A.; Chen, W.S.

1985-08-13T23:59:59.000Z

248

Compared performances of ENDF/B-VI and JEF-2.2 for MOX core physics.  

SciTech Connect (OSTI)

The US is currently evaluating the use of MOX fuel in commercial LWR's for reducing weapons grade Pu stockpiles. The design and licensing processes will require that the validity of the nuclear data libraries and codes used in the effort be demonstrated. Unfortunately, there are only a very limited number of relatively old and non representative integral experiments' freely available to the US programs. This lack of adequate experimental data can be partially remediated by comparing the results of well validated European codes with the results of candidate US codes. The demonstration can actually be divided in two components: a code to code (Monte Carlo) comparison can easily demonstrate the validity and limits of the proposed algorithms; and the performances of nuclear data libraries should be compared, major trends should be observed, and their origins should be explained in terms of differences in evaluated nuclear data; In this paper, we have compared the performances of the JEF-2.2 and ENDF/B-VI.4 libraries for a series of benchmarks for k{sub eff}, void worth, and pin power distributions. Note that JEF-2.2 has been extensively validated for MOX applications.

Finck, P. J.

1998-07-08T23:59:59.000Z

249

Coupled spin and valley physics in monolayer MoS2 and group-VI dichalcogenides  

SciTech Connect (OSTI)

We show that inversion symmetry breaking together with spin-orbit coupling leads to coupled spin and valley physics in monolayer MoS2 and group-VI dichalcogenides, making possible controls of spin and valley in these 2D materials. The spin-valley coupling at the valence band edges suppresses spin and valley relaxation, as flip of each index alone is forbidden by the 0.1 eV valley contrasting spin splitting. Valley Hall and spin Hall effects coexist in both electron-doped and hole-doped systems. Optical interband transitions have frequency-dependent polarization selection rules which allow selective photoexcitation of carriers with various combination of valley and spin indices. Photo-induced spin Hall and valley Hall effects can generate long lived spin and valley accumulations on sample boundaries. The physics discussed here provides a route towards the integration of valleytronics and spintronics in multi-valley materials with strong spin-orbit coupling and inversion symmetry breaking.

Xiao, Di [ORNL; Liu, G. B. [University of Hong Kong, The; Feng, wanxiang [Chinese Academy of Sciences; Xu, Xiaodong [University of Washington; Yao, Wang [University of Hong Kong, The

2012-01-01T23:59:59.000Z

250

Methods for forming thin-film heterojunction solar cells from I-III-VI.sub. 2  

DOE Patents [OSTI]

An improved thin-film, large area solar cell, and methods for forming the same, having a relatively high light-to-electrical energy conversion efficiency and characterized in that the cell comprises a p-n type heterojunction formed of: (i) a first semiconductor layer comprising a photovoltaic active material selected from the class of I-III-VI.sub.2 chalcopyrite ternary materials which is vacuum deposited in a thin "composition-graded" layer ranging from on the order ot about 2.5 microns to about 5.0 microns (.congruent.2.5 .mu.m to .congruent.5.0 .mu.m) and wherein the lower region of the photovoltaic active material preferably comprises a low resistivity region of p-type semiconductor material having a superimposed region of relatively high resistivity, transient n-type semiconductor material defining a transient p-n homojunction; and (ii), a second semiconductor layer comprising a low resistivity n-type semiconductor material; wherein interdiffusion (a) between the elemental constituents of the two discrete juxtaposed regions of the first semiconductor layer defining a transient p-n homojunction layer, and (b) between the transient n-type material in the first semiconductor layer and the second n-type semiconductor layer, causes the The Government has rights in this invention pursuant to Contract No. EG-77-C-01-4042, Subcontract No. XJ-9-8021-1 awarded by the U.S. Department of Energy.

Mickelsen, Reid A. (Bellevue, WA) [Bellevue, WA; Chen, Wen S. (Seattle, WA) [Seattle, WA

1985-08-13T23:59:59.000Z

251

Investigating magnetic proximity effects in NiO/Pd with polarized neutron reflectometry  

Science Journals Connector (OSTI)

With polarized neutron reflectometry we investigated NiO/Pd heterostructures for the presence of a magnetic proximity effect, which is expected to produce an induced ferromagnetic moment in Pd. Using a specific isotope mixture of Ni in the preparation of NiO, the chemical contrast across the Pd/NiO interface was greatly suppressed, thus enhancing sensitivity to magnetic contrast at the reflecting interface. Despite enhanced sensitivity, no evidence for a proximity effect was observed. If present, the magnetic moment per Pd atom could not be more than 0.01?B, regardless of Pd layer thickness, crystalline interface orientation, and number of NiO/Pd bilayers.

A. Hoffmann; M. R. Fitzsimmons; J. A. Dura; C. F. Majkrzak

2001-12-19T23:59:59.000Z

252

Interdiffusion in NiMnSb/V/NiMnSb: X-ray and neutron reflectivity investigation of ion beam sputtered trilayer systems  

SciTech Connect (OSTI)

The new trilayer system NiMnSb/V/NiMnSb on MgO(001) was investigated by means of vibrating sample magnetometry (VSM), x-ray, and neutron reflectivity. VSM revealed a coercive field H{sub c}=23 Oe and a hysteresis loop similar to that of an uncoupled ferromagnet. The x-ray and neutron reflectivity data proved that interface roughnesses of 10 {Angstrom} are present. A detailed analysis yielded significant interdiffusion at the NiMnSb/V interfaces which is one possible explanation for the weak magnetoresistance effect measured in similar NiMnSb-based multilayer systems. {copyright} {ital 1999 American Institute of Physics.}

Schlomka, J.; Tolan, M.; Press, W. [Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet zu Kiel, 24098 Leibnizstrasse 17-19, Kiel (Germany)] [Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet zu Kiel, 24098 Leibnizstrasse 17-19, Kiel (Germany); Fitzsimmons, M.R. [Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Siebrecht, R. [Institut Laue-Langevin, 38042 Grenoble, Cedex 9 (France)] [Institut Laue-Langevin, 38042 Grenoble, Cedex 9 (France); Schubert, D.W. [GKSS Forschungszentrum, 21502 Geesthacht (Germany)] [GKSS Forschungszentrum, 21502 Geesthacht (Germany); Simon, P. [Max Planck Institut fuer Polymerforschung, 55021 Mainz (Germany)] [Max Planck Institut fuer Polymerforschung, 55021 Mainz (Germany)

1999-11-01T23:59:59.000Z

253

First-principles investigations of Ni3Al(111) and NiAl(110) surfaces at metal dusting conditions  

SciTech Connect (OSTI)

We investigate the structure and surface composition of the {gamma}{prime}-Ni{sub 3}Al(111) and {beta}-NiAl(110) alloy surfaces at conditions relevant for metal dusting corrosion related to catalytic steam reforming of natural gas. In regular service as protective coatings, nickel-aluminum alloys are protected by an oxide scale, but in case of oxide scale spallation, the alloy surface may be directly exposed to the reactive gas environment and vulnerable to metal dusting. By means of density functional theory and thermochemical calculations for both the Ni{sub 3}Al and NiAl surfaces, the conditions under which CO and OH adsorption is to be expected and under which it is inhibited, are mapped out. Because CO and OH are regarded as precursors for nucleating graphite or oxide on the surfaces, phase diagrams for the surfaces provide a simple description of their stability. Specifically, this study shows how the CO and OH coverages depend on the steam to carbon ratio (S/C) in the gas and thereby provide a ranking of the carbon limits on the different surface phases.

Saadi, Souheil

2011-03-01T23:59:59.000Z

254

Low-temperature magnetization in Ni-rich gamma-Ni100-x-yFexVy alloys  

E-Print Network [OSTI]

is antiferromagnetic) suppresses the ferromagnetic order in the NiFe binary alloys. The magnetization of the alloys with low V (y less than or equal to 11 at. %) has shown a good fit to only the spin-wave T-3/2 term whereas the data for the high V (gamma greater than...

Chakraborty, S.; Mukherjee, GD; Rathnayaka, KDD; Naugle, Donald G.; Majumdar, AK.

2000-01-01T23:59:59.000Z

255

Effect of Composition on the Solidification Behavior of Several Ni-Cr-Mo and Fe-Ni-Cr-Mo Alloys  

E-Print Network [OSTI]

simulate the solidifi- cation behavior of dissimilar welds made between AL-6XN and Ni-base filler metals.[3 differential thermal analysis (DTA) samples and welded specimens. This explains the in- variance of the amount of eutectic constituent observed in the microstructure in the welded and DTA conditions. Multicomponent

DuPont, John N.

256

El Ni~no and La Ni~na: Causes and Global Consequences Michael J McPhaden  

E-Print Network [OSTI]

releases heat into the middle and upper troposphere. This heat provides a source of energy to drive global wind fields that extend El Ni~no's influence to remote parts of the planet. Altered circulation patterns produce droughts, floods, unusual storminess, heat waves, and other weather extremes that have

257

IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 4, JULY 2002 1803 New Ni5Al3 Underlayer for Longitudinal  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON MAGNETICS, VOL. 38, NO. 4, JULY 2002 1803 New Ni5Al3 Underlayer--We describe a new Ni5Al3 underlayer for high-den- sity longitudinal magnetic recording. The Ni5Al3 underlayer has the FCC derivative Ga3Pt5 structure. The Ni5Al3 (221) plane has good lattice match with the Co

Laughlin, David E.

258

In situ Study of the Formation of Silicide Phases in Amorphous Ni-Si Mixed Layers  

SciTech Connect (OSTI)

In this paper, we investigated Ni silicide phase formation when Si is added within an as deposited 50 nm Ni film. A series of 22 samples with a Si content varying from 0 to 50 at.% was prepared and systematically investigated with in situ x-ray diffraction. The inert oxide substrate was used to identify the phases which first crystallize in an amorphous Ni-Si mixture of a given concentration. The noncongruent silicides Ni{sub 3}Si and Ni{sub 3}Si{sub 2} are never observed to crystallize readily out of the mixture. A remarkable observation is the initial crystallization at low temperature of a hexagonal Ni-silicide, observed over a broad mixed layer composition [35-49%Si]; this hexagonal phase nucleates readily as a single phase [39-47%Si] or together with Ni{sub 2}Si [35-38%Si] or NiSi [49%Si]. This low-temperature phase is related to the high temperature {theta}-phase, but covers a wide composition range up to 47%Si. For the same Ni-Si films deposited on Si(100), the initial nucleation of the Ni(Si) mixture is similar as for the samples deposited on SiO{sub 2}, such that the complex sequence of metal-rich Ni-silicide phases typically observed during Ni/Si reactions is modified. For samples containing more than 21%Si, a simpler sequential phase formation was observed upon annealing. From pole figures, the phase formation sequence was observed to have a significant influence on the texture of the technologically relevant NiSi phase. For mixture composition ranging from 38% to 43%Si, the initial transient {theta}-phase appears extremely textured on Si(100). The observed transient appearance of a hexagonal phase is of importance in understanding the phase formation mechanisms in the Ni-Si system.

Van Bockstael, C.; Detavernier, C; Van Meirhaeghe, R; Jordan-Sweet, J; Lavoie, C

2009-01-01T23:59:59.000Z

259

Influence of phosphate and silica on U(VI) precipitation from acidic and neutralized wastewaters  

SciTech Connect (OSTI)

Uranium speciation and physical-chemical characteristics were studied in solids precipitated from synthetic acidic to circumneutral wastewaters in the presence and absence of dissolved silica and phosphate to examine thermodynamic and kinetic controls on phase formation. Composition of synthetic wastewater was based on disposal sites 216-U-8 and 216-U-12 Cribs at the Hanford site (WA, USA). In the absence of dissolved silica or phosphate, crystalline or amorphous uranyl oxide hydrates, either compreignacite or meta-schoepite, precipitated at pH 5 or 7 after 30 d of reaction, in agreement with thermodynamic calculations. In the presence of 1 mM dissolved silica representative of groundwater concentrations, amorphous phases dominated by compreignacite precipitated rapidly at pH 5 or 7 as a metastable phase and formation of poorly-crystalline boltwoodite, the thermodynamically stable uranyl silicate phase, was slow. In the presence of phosphate (3 mM), meta-ankoleite initially precipitated as the primary phase at pH 3, 5, or 7 regardless of the presence of 1 mM dissolved silica. Analysis of precipitates by U LIII-edge EXAFS indicated that autunite-type sheets of meta-ankoleite transformed to phosphuranylite-type sheets after 30 d of reaction, probably due to Ca substitution in the structure. Low solubility of uranyl phosphate phases limits dissolved U(VI) concentrations but differences in particle size, crystallinity, and precipitate composition vary with pH and base cation concentration, which will influence the thermodynamic and kinetic stability of these phases.

Kanematsu, Masakazu; Perdrial, Nicolas; Um, Wooyong; Chorover, Jon; O'Day, Peggy A.

2014-04-22T23:59:59.000Z

260

Environmentally Assisted Cracking of Ni-Base Alloys [Corrosion and  

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

LWRs > Environmentally Assisted LWRs > Environmentally Assisted Cracking of Ni-Base Alloys Capabilities Materials Testing Environmentally Assisted Cracking (EAC) of Reactor Materials Corrosion Performance/Metal Dusting Overview Light Water Reactors Fatigue Testing of Carbon Steels and Low-Alloy Steels Environmentally Assisted Cracking of Ni-Base Alloys Irradiation-Induced Stress Corrosion Cracking of Austenitic Stainless Steels Steam Generator Tube Integrity Program Air Oxidation Kinetics for Zr-based Alloys Fossil Energy Fusion Energy Metal Dusting Publications List Irradiated Materials Steam Generator Tube Integrity Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Corrosion and Mechanics of Materials Light Water Reactors

Note: This page contains sample records for the topic "vi rgi ni" 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

In situ Oxidation of Ultrathin Silver Films on Ni(111)  

SciTech Connect (OSTI)

Oxidation of silver films of one- and two-monolayer thicknesses on the Ni(111) surface was investigated by low-energy electron microscopy at temperatures of 500 and 600 K. Additionally, intensity-voltage curves were measured in situ during oxidation to reveal the local film structure on a nanometer scale. At both temperatures, we find that exposure to molecular oxygen leads to the destabilization of the Ag film with subsequent relocation of the silver atoms to small few-layer-thick silver patches and concurrent evolution of NiO(111) regions. Subsequent exposure of the oxidized surface to ethylene initiates the transformation of bilayer islands back into monolayer islands, demonstrating at least partial reversibility of the silver relocation process at 600 K.

A Meyer; I Flege; S Senanayake; B Kaemena; R Rettew; F Alamgir; J Falta

2011-12-31T23:59:59.000Z

262

Coulomb excitation of $^{68}$Ni at safe energies  

E-Print Network [OSTI]

The $B(E2;0^+\\to2^+)$ value in $^{68}$Ni has been measured using Coulomb excitation at safe energies. The $^{68}$Ni radioactive beam was post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted $\\gamma$ rays were detected by the MINIBALL detector array. A kinematic particle reconstruction was performed in order to increase the measured c.m. angular range of the excitation cross section. The obtained value of 2.8$^{+1.2}_{-1.0}$ 10$^2$ e$^2$fm$^4$ is in good agreement with the value measured at intermediate energy Coulomb excitation, confirming the low $0^+\\to2^+$ transition probability.

N. Bree; I. Stefanescu; P. A. Butler; J. Cederkll; T. Davinson; P. Delahaye; J. Eberth; D. Fedorov; V. N. Fedosseev; L. M. Fraile; S. Franchoo; G. Georgiev; K. Gladnishki; M. Huyse; O. Ivanov; J. Iwanicki; J. Jolie; U. Kster; Th. Krll; R. Krcken; B. A. Marsh; O. Niedermaier; P. Reiter; H. Scheit; D. Schwalm; T. Sieber; J. Van de Walle; P. Van Duppen; N. Warr; D. Weisshaar; F. Wenander; S. Zemlyanoy

2008-03-05T23:59:59.000Z

263

Magnetic field-induced phase transformation and variant reorientation in Ni2MnGa and NiMnCoIn magnetic shape memory alloys  

E-Print Network [OSTI]

The purpose of this work is to reveal the governing mechanisms responsible for the magnetic field-induced i) martensite reorientation in Ni2MnGa single crystals, ii) stress-assisted phase transformation in Ni2MnGa single crystals and iii) phase...

Karaca, Haluk Ersin

2009-05-15T23:59:59.000Z

264

Electron Density Distributions Calculated for the Nickel Sulfides Millerite, Vaesite, and Heazlewoodite and Nickel Metal: A Case for the Importance of Ni-Ni Bond Paths for  

E-Print Network [OSTI]

Electron Density Distributions Calculated for the Nickel Sulfides Millerite, Vaesite, and Heazlewoodite and Nickel Metal: A Case for the Importance of Ni-Ni Bond Paths for Electron Transport G. V. Gibbs point properties (the electron density (F) and the Hessian of F at the bond critical points (bcp

Downs, Robert T.

265

Formation and Stability of Ni-Al Hydroxide Phases in Soils  

SciTech Connect (OSTI)

The formation of mixed metal-aluminum hydroxide surface precipitates is a potentially significant uptake route for trace metals (including Co, Ni, and Zn) in environmental systems. This paper investigates the effect of mixed Ni-Al hydroxide precipitate formation and aging on Ni solubility and bioavailability in laboratory contaminated soils. Two Delaware agricultural soils were reacted with a 3 mM Ni solution for 12 months at pH's above and below the threshold for mixed Ni-Al hydroxide formation. Ni speciation was determined at 1, 6, and 12 months using X-ray absorption spectroscopy (XAS). Precipitate solubility was examined through desorption experiments using HNO{sub 3} and EDTA as desorbing agents, whereas metal bioavailability was assessed using a Ni-specific bacterial biosensor. For both soils, the formation of Ni-Al hydroxide surface precipitates resulted in a reduction in the fraction of desorbed and bioavailable Ni. However, precipitate dissolution was greater, particularly with EDTA, than in published studies on isolated soil clay fractions, and less affected by aging processes. These results suggest that mixed Ni-Al hydroxide phases forming in real world environments may be both longer-lasting and more susceptible to ligand-promoted dissolution than previously expected.

Peltier, E.; Van Der Lelie, D; Sparks, D

2010-01-01T23:59:59.000Z

266

Electronic structure of Co-Ni-Ga Heusler alloys studied by resonant photoemission  

SciTech Connect (OSTI)

The electronic structures of Co{sub 2.01}Ni{sub 1.05}Ga{sub 0.94} and Co{sub 1.76}Ni{sub 1.46}Ga{sub 0.78} Heusler alloys have been investigated by resonant photoemission spectroscopy across the 3p-3d transition of Co and Ni. For the Ni excess composition Co{sub 1.76}Ni{sub 1.46}Ga{sub 0.78}, the valence band peak shows a shift of 0.25 eV as compared to the near stoichiometric composition Co{sub 2.01}N1{sub 1.05}Ga{sub 0.94}. Also an enhancement is observed in the Ni related satellite features in the valence band for the Ni excess composition. Due to hybridization of Co and Ni 3d states in these systems, the Co and Ni 3p-3d resonance energies are found to be higher as compared to Co and Ni metals. Theoretical first principle calculation is performed to understand the features in the valence band and the shape of the resonance profile.

Baral, Madhusmita, E-mail: madhusmita@rrcat.gov.in; Banik, Soma, E-mail: madhusmita@rrcat.gov.in; Ganguli, Tapas, E-mail: madhusmita@rrcat.gov.in; Chakrabarti, Aparna, E-mail: madhusmita@rrcat.gov.in; Deb, S. K. [Indus Synchrotrons Utilization Division, Raja Ramanna Centre for Advanced Technology, Indore-452013 (India); Thamizhavel, A. [Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005 (India); Wadikar, Avinash; Phase, D. M. [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore-452017 (India)

2014-04-24T23:59:59.000Z

267

Proton spectroscopy of 48Ni, 46Fe, and 44Cr  

E-Print Network [OSTI]

Results of decay spectroscopy on nuclei in vicinity of the doubly magic 48Ni are presented. The measurements were performed with a Time Projection Chamber with optical readout which records tracks of ions and protons in the gaseous volume. Six decays of 48Ni including four events of two-proton ground-state radioactivity were recorded. An advanced reconstruction procedure yielded the 2p decay energy for 48Ni of Q2p = 1.29(4) MeV. In addition, the energy spectra of \\b{eta}-delayed protons emitted in the decays of 44Cr and 46Fe, as well as half-lives and branching ratios were determined. The results were found to be consistent with the previous measurements made with Si detectors. A new proton line in the decay of 44Cr corresponding to the decay energy of 760 keV is reported. The first evidence for the \\b{eta}2p decay of 46 Fe, based on one clear event, is shown.

M. Pomorski; M. Pftzner; W. Dominik; R. Grzywacz; A. Stolz; T. Baumann; J. S. Berryman; H. Czyrkowski; R. D?browski; A. Fija?kowska; T. Ginter; J. Johnson; G. Kami?ski; N. Larson; S. N. Liddick; M. Madurga; C. Mazzocchi; S. Mianowski; K. Miernik; D. Miller; S. Paulauskas; J. Pereira; K. P. Rykaczewski; S. Suchyta

2014-07-06T23:59:59.000Z

268

SANS study of third phase formation in the U(VI)-HNO{sub 3}/ TBP-n-dodecane system.  

SciTech Connect (OSTI)

In spite of its technological importance, third phase formation in the extraction of hexavalent actinides from nitric acid solutions into alkane solutions of tri-n-butylphosphate (TBP) has received only limited attention. The focus of the few available literature works has been primarily centered on the composition of the third phase and on the stoichiometry of the metal complexes. Very little is known, on the other hand, about the structure and morphology of the third phase species of hexavalent actinides. In the present investigation, the formation of a third phase upon extraction of U(VI) by 20% TBP in deuterated n-dodecane from nitric acid solutions was studied. Chemical analyses have shown that U(VI) exists in the third phase as a species having the composition UO{sub 2}(NO{sub 3}){sub 2}{center_dot}(TBP){sub 2}{center_dot}HNO{sub 3}. Small-angle neutron scattering measurements on TBP solutions loaded with only HNO{sub 3} or with increasing amounts of U(VI) have revealed the presence, both before and after phase splitting, of relatively large ellipsoidal aggregates with the parallel and perpendicular axes having lengths up to about 64 and 15 Angstroms, respectively. The formation of these aggregates is observed in all cases, that is, when only HNO3, only UO{sub 2}(NO{sub 3}){sub 2}, or both HNO{sub 3} and UO{sub 2}(NO{sub 3}){sub 2} are extracted by the TBP solution. Upon third phase formation, the SANS data reveal the presence of smaller aggregates in both the heavy and light organic phase.

Chiarizia, R.; Jensen, M. P.; Borkowski, M.; Ferraro, J. R.; Thiyagarajan, P.; Littrell, K. C.

2003-01-01T23:59:59.000Z

269

Room-Temperature Ferromagnetism in a II-VI Diluted Magnetic Semiconductor Zn1-xCrxTe  

Science Journals Connector (OSTI)

The magnetic and magneto-optical properties of a Cr-doped II-VI semiconductor ZnTe were investigated. Magnetic circular dichroism measurements showed a strong interaction between the sp carriers and localized d spins, indicating that Zn1-xCrxTe is a diluted magnetic semiconductor. The Curie temperature of the film with x=0.20 was estimated to be 30010???K, which is the highest value ever reported for a diluted magnetic semiconductor in which sp-d interactions were confirmed. In spite of its high Curie temperature, Zn1-xCrxTe film shows semiconducting electrical transport properties.

H. Saito; V. Zayets; S. Yamagata; K. Ando

2003-05-20T23:59:59.000Z

270

"Aegean Seals of the Late Bronze Age: Stylistic Groups, VI. Fourteenth Century Mainland and Later Fourteenth Century Cretan Workshops"  

E-Print Network [OSTI]

Island Sanctuaries Group sW 17 /G\\I M:t4R ) oV &+W 14 6\\w 16 12 10 50 John G. Younger Fig. 1 1-5: Columbia Gtoup 6*8: Group with Misplaced Fotelegs 9: Group with Crossed Hocks m, 53Aegean seals of the Late Bronze Age VI 37 Fig. 4 31 -38: Rhodian Hunt.... 'Ihe Group with Misplaced Forelegs 3. The Group with Crossed Hocks 4. The Group with Wicked Eyes B. The Island Sanctuaries Clroup (p.61) 5. The Central Island Sanctuaties Group 6. The Rhodian Hunt Group 7. The Island Sanctuaries Group: Miscellaneous...

Younger, John G.

1986-01-01T23:59:59.000Z

271

Effect of temperature on the extraction of uranium(VI) from nitric acid by tri-n-amyl phosphate  

SciTech Connect (OSTI)

Studies have been carried out on the effect of temperature on the extraction of U(VI) from nitric acid medium by tri-n-amyl phosphate/n-dodecane, measured as a function of the extractant concentration and aqueous phase acidity. The results indicate that the extraction is exothermic as in the case of tri-n-butyl phosphate. From the data available an effort has been made to calculate the equilibrium constant, the Gibbs energy change and the entropy changes of the extraction reaction. 21 refs., 3 figs., 4 tabs.

Srinivasan, T.G.; Rao, P.R.V. [Indira Gandhi Centre for Atomic Research, Kalpakkam (India); Sood, D.D. [Indira Gandhi Centre for Atomic Research, Kalpakkam (India)]|[BARC, Mumbai (India)

1997-01-01T23:59:59.000Z

272

Analysis of radiation exposure, Third Marine Corps Provisional Atomic Exercise Brigade. Exercise Desert Rock VI, Operation Teapot. Technical report  

SciTech Connect (OSTI)

The radiation dose is reconstructed for 3d MCPAEB personnel participating in exercises involving helicopter-lifted assaults in conjunction with Shot Bee of Operation Teapot, Exercise Desert Rock VI. Brigade personnel were exposed to initial radiation while in trenches at the time of the Shot Bee detonation. They were also exposed to residual radiation from an earlier test shot (Shot Turk) during their subsequent maneuvers and to residual radiation from Shot Bee during an inspection of equipment displays. The calculated total gamma doses to the bulk of the participating troops range from about 0.57-0.85 rem.

Goetz, J.; Klemm, J.; Ortlieb, E.

1984-02-15T23:59:59.000Z

273

Single-crystal neutron diffraction studies on Ni-based metal-pnictide superconductor BaNi2As2  

SciTech Connect (OSTI)

We report the results of single-crystal neutron diffraction studies of the superconductor BaNi{sub 2}As{sub 2}. The experiments were performed on a tiny crystal of mass 0.8 mg at several temperatures between 20 and 200 K using the Single Crystal Diffractometer, SCD, at the Los Alamos Neutron Science Center. Above 130 K, BaNi{sub 2}As{sub 2} crystallizes in the tetragonal ThCr{sub 2}Si{sub 2} structure. Our neutron diffraction data corroborate a first-order structural transition around 130 K with a relatively large hysteresis of about 10K, in agreement with observations from bulk studies. The anisotropic thermal displacement coefficients are enhanced along c-axis approaching the transition, and a splitting is observed for in-plane type reflections below the transition, which is evidence for a change in crystal structure.

Kothapalli, Karunakar [Los Alamos National Laboratory; Ronning, F [Los Alamos National Laboratory; Bauer, E D [Los Alamos National Laboratory; Schultz, A J [Los Alamos National Laboratory; Nakotte, Heinz [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

274

Next-generation multijunction solar cells: The promise of II-VI materials  

Science Journals Connector (OSTI)

High concentration photovoltaic (HCPV) systems offer the highest photovoltaic(PV) conversion efficiencies. Also as production is beginning to ramp up HCPV is becoming cost competitive with thin-film poly-CdTe and crystalline Si systems in high solar insolation regions. High solar concentrations X???500 are used to increase cell efficiencies and greatly reduce the cell area per unit of incident solar radiation thereby greatly reducing the cell cost per watt. The monolithic three-junction (3J) solar cells presently used in HCPV systems typically consist of two epitaxialIII-V homojunctions such as GaInP and GaInAs grown on an active Ge substrate by metal-organic chemical vapor deposition (MOCVD). The III-Vbandgaps are chosen to match the currents generated in each junction and minimize the energy lost to thermalization of the electron-hole pairs generated subject to the constraint of approximate lattice matching. We propose using cells consisting of one or more CdTe-based II-VI homojunctions grown on large-area active Si substrates by high-throughput MBE or a less expensive high-vacuum deposition technique as an alternative to III-V based multijunction cells grown by MOCVD. The bandgap of Si is more optimal than that of Ge for two-junction (2J) or 3J cells and lattice mismatches affect the efficiencies of such cells only slightly which allows greater freedom in the choice of bandgaps and thus the potential for higher efficiencies. Also such cells could be manufactured at a much lower cost due to the larger area much lower cost and superior mechanical properties of Si substrates as compared to Ge substrates. The much lower cell cost also would enable medium concentration PV systems that would require more cell area but with simplified less expensive tracking and optics resulting in lower overall system costs. Promising initial results from material-property measurements and single-junction and 2J CdZnTe/Si cell characterization results are given. Both the promise of the proposed technology and the challenges it faces are discussed.

J. W. Garland; T. Biegala; M. Carmody; C. Gilmore; S. Sivananthan

2011-01-01T23:59:59.000Z

275

Ni62(n,?) and Ni63(n,?) cross sections measured at the n_TOF facility at CERN  

Science Journals Connector (OSTI)

The cross section of the Ni62(n,?) reaction was measured with the time-of-flight technique at the neutron time-of-flight facility n_TOF at CERN. Capture kernels of 42 resonances were analyzed up to 200 keV neutron energy and Maxwellian averaged cross sections (MACS) from kT= 5100 keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at kT=30 keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the Ni63(n,?) reaction was measured for the first time at n_TOF. We determined unresolved cross sections from 10 to 270 keV with a systematic uncertainty of 17%. These results provide fundamental constraints on s-process production of heavier species, especially the production of Cu in massive stars, which serve as the dominant source of Cu in the solar system.

C. Lederer et al. (n_TOF Collaboration)

2014-02-28T23:59:59.000Z

276

Computational Study of Sulfurnickel Interactions: A New SNi Phase Diagram  

SciTech Connect (OSTI)

Prediction of the interactions between H2S-contaminated hydrogen fuel and Ni surfaces under conditions similar to those for solid oxide fuel cell (SOFC) operation using DFT (density function theory) calculations (with thermodynamic corrections) has resulted in a new SNi phase diagram, which suggests the existence of an intermediate state between clean Ni surfaces and nickel sulfides sulfur atoms adsorbed on Ni surfaces. This prediction is consistent with many experimental observations relevant to sulfur poisoning of Nibased anodes in SOFCs, which cannot be explained using the existing SNi bulk phase diagram from classical thermodynamics. The accurate prediction of the adsorption phase is vital to a fundamental understanding of the sulfur poisoning mechanism of Ni-based anodes under SOFC operating conditions.

Wang, Jeng-Han; Liu, Meilin

2007-06-22T23:59:59.000Z

277

PT AND PT/NI "NEEDLE" ELETROCATALYSTS ON CARBON NANOTUBES WITH HIGH ACTIVITY FOR THE ORR  

SciTech Connect (OSTI)

Platinum and platinum/nickel alloy electrocatalysts supported on graphitized (gCNT) or nitrogen doped carbon nanotubes (nCNT) are prepared and characterized. Pt deposition onto carbon nanotubes results in Pt 'needle' formations that are 3.5 nm in diameter and {approx}100 nm in length. Subsequent Ni deposition and heat treatment results in PtNi 'needles' with an increased diameter. All Pt and Pt/Ni materials were tested as electrocatalysts for the oxygen reduction reaction (ORR). The Pt and Pt/Ni catalysts showed excellent performance for the ORR, with the heat treated PtNi/gCNT (1.06 mA/cm{sup 2}) and PtNi/nCNT (0.664 mA/cm{sup 2}) showing the highest activity.

Colon-Mercado, H.

2011-11-10T23:59:59.000Z

278

INTERPRTATION DES FAUTES D'EMPILEMENT DANS L'ANTIFERROMAGNTIQUE K2NiF4  

E-Print Network [OSTI]

859. INTERPR?TATION DES FAUTES D'EMPILEMENT DANS L'ANTIFERROMAGN?TIQUE K2NiF4 Par R. PLUMIER. 2014 Nous montrons qu'une légère déformation orthorhombique de la maille de K2NiF4 entraîne parNiF4 cell leads to a decrease of the free energy of the crystal through an exchange striction

Boyer, Edmond

279

Ni(II) Sorption on Biogenic Mn-Oxides with Varying Mn  

E-Print Network [OSTI]

Ni(II) Sorption on Biogenic Mn-Oxides with Varying Mn Octahedral Layer Structure M E N G Q I A N G(II) sorption mechanisms were determined at pH 7 and at different Ni(II) loadings, using isotherm and extended X in the interlayer of the BioMnOx and the maximum Ni(II) sorption capacity increases as the formation pH of Bio

Sparks, Donald L.

280

Plutonium(IV) and plutonium(VI) extraction by 1-hydroxy-6-N-octylcarboxamide-2-(1H)-pyridinone  

SciTech Connect (OSTI)

Extraction of Pu(IV) and Pu(VI) from nitric acid media by the promising new extractant 1-hydroxy-6-N-octylcarboxamide-2(1H)-pyridinone (octyl-1,2-HOPO) has been investigated. The effects of nitric acid, sodium, aluminum and iron(III) nitrates on extraction have been examined. Octyl-1,2-HOPO exhibits high specificity for Pu(IV) over a wide range of acidity and ionic strength. The affinity of octyl-1,2-HOPO for Pu(VI) is much less than for Pu(IV). However, the extraction of Pu(VI) is possible from acidic as well as from highly salted media. Two water soluble ligands, 1-hydroxyethane-1,1,-diphosphonic acid (HEDPA) and H(2,2)-1,2-HOPO, have been shown to be very effective for back extraction.

Romanovski, V.V. [Lawrence Livermore National Lab., CA (United States). Glenn T. Seaborg Inst. for Transactinium Science; Hoffman, D.C. [Lawrence Livermore National Lab., CA (United States). Glenn T. Seaborg Inst. for Transactinium Science]|[Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; White, D.J.; Xu, J.; Raymond, K.N. [Univ. of California, Berkeley, CA (United States). Dept. of Chemistry

1999-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

NiSource Energy Technologies Inc.: System Integration of Distributed Power for Complete Building Systems  

SciTech Connect (OSTI)

Summarizes NiSource Energy Technologies' work under contract to DOE's Distribution and Interconnection R&D. Includes studying distributed generation interconnection issues and CHP system performance.

Not Available

2003-10-01T23:59:59.000Z

282

NiSource Energy Technologies: Optimizing Combined Heat and Power Systems  

SciTech Connect (OSTI)

Summarizes NiSource Energy Technologies' work under contract to DOE's Distribution and Interconnection R&D. Includes studying distributed generation interconnection issues and CHP system performance.

Not Available

2003-01-01T23:59:59.000Z

283

Reducible Supports for Ni-based Oxygen Carriers in Chemical Looping Combustion  

Science Journals Connector (OSTI)

Reducible Supports for Ni-based Oxygen Carriers in Chemical Looping Combustion ... Industrial & Engineering Chemistry Research2014 53 (42), 16341-16348 ...

Saurabh Bhavsar; Gtz Veser

2013-03-29T23:59:59.000Z

284

Effect of Pt addition on Ni silicide formation at low temperature: Growth, redistribution, and solubility  

SciTech Connect (OSTI)

The formation of Ni silicide during the reaction between Ni(5% Pt) and a Si(100) substrate has been analyzed by differential scanning calorimetry (DSC), in situ x-ray diffraction (XRD), cross-sectional transmission electron microscopy (TEM), and {sup 4}He{sup +} Rutherford backscattering. The DSC measurements show evidence of the Ni{sub 2}Si nucleation followed by lateral growth formation. In situ XRD and TEM have been used to investigate the sequence of formation of the silicides. These experiments show that the formations of Ni{sub 2}Si and NiSi occur simultaneously in the presence of the Pt alloy. The redistribution of platinum at different stages of the Ni silicide growth has been determined. We have estimated the solubility limit of platinum (1 at. % at 573 K) in the Ni{sub 2}Si phase by extrapolation from a measured value at 1073 K. This redistribution is explained in terms of the solubility limits and the diffusion of Pt in the Ni{sub 2}Si and NiSi phases. Pt is more likely to reside at the silicide grain boundaries and the interfaces where it can slow down the silicide growth kinetics.

Hoummada, K.; Perrin-Pellegrino, C.; Mangelinck, D. [Aix-Marseille Universite, IM2NP, Campus de Saint-Jerome, Avenue Escadrille Normandie Niemen-Case 142, F-13397 Marseille Cedex (France); CNRS, IM2NP (UMR 6242), Case 142, Faculte de Saint-Jerome, F-13397 Marseille Cedex (France)

2009-09-15T23:59:59.000Z

285

Facile additive-free synthesis of iron oxide nanoparticles for efficient adsorptive removal of Congo red and Cr(VI)  

Science Journals Connector (OSTI)

Abstract The iron oxide nanoparticles had been successfully synthesized via an additive-free hydrolysis process at 75C for 12h. The product was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and N2 adsorptiondesorption. The results of XRD and N2 adsorptiondesorption demonstrated that the as-prepared product was mainly ?-Fe2O3 with a large surface area of 164.1m2g?1. The TEM images illustrated that the as-prepared product was found to consist of a mixture of irregular spherical nanoparticles (a diameter of ?50nm) and nanowhiskers (a diameter of ?50nm and uneven length). The as-prepared product was used to investigate its promising applications in water treatment. Due to its small size and large surface area, the maximum adsorption capacities of Congo red and Cr(VI) have been determined using the Langmuir equation and found to reach up to 253.8 and 17.0mgg?1, respectively. The facile synthesis method and the superior adsorption performance derived from the iron oxide nanoparticles display the potential applications for the removal of Congo red and Cr(VI) from aqueous solution.

Tao Hao; Chao Yang; Xuehui Rao; Jide Wang; Chunge Niu; Xintai Su

2014-01-01T23:59:59.000Z

286

VI-Band Follow-Up Observations of Ultra-Long-Period Cepheid Candidates in M31  

E-Print Network [OSTI]

The ultra-long period Cepheids (ULPCs) are classical Cepheids with pulsation periods exceeding $\\approx 80$ days. The intrinsic brightness of ULPCs are ~1 to ~3 mag brighter than their shorter period counterparts. This makes them attractive in future distance scale work to derive distances beyond the limit set by the shorter period Cepheids. We have initiated a program to search for ULPCs in M31, using the single-band data taken from the Palomar Transient Factory, and identified eight possible candidates. In this work, we presented the VI-band follow-up observations of these eight candidates. Based on our VI-band light curves of these candidates and their locations in the color-magnitude diagram and the Period-Wesenheit diagram, we verify two candidates as being truly ULPCs. The six other candidates are most likely other kinds of long-period variables. With the two confirmed M31 ULPCs, we tested the applicability of ULPCs in distance scale work by deriving the distance modulus of M31. It was found to be $\\mu_...

Ngeow, Chow-Choong; Yang, Michael Ting-Chang; Lin, Chi-Sheng; Hsiao, Hsiang-Yao; Cheng, Yu-Chi; Lin, Zhong-Yi; Lin, I-Ling; Kanbur, Shashi M; Ip, Wing-Huen

2015-01-01T23:59:59.000Z

287

No Measurable Changes in 238U/235U due to DesorptionAdsorption of U(VI) from Groundwater at the Rifle, Colorado, Integrated Field Research Challenge Site  

Science Journals Connector (OSTI)

Uranium (U) is an element of considerable interest due to its importance for energy and weapons industries and its contribution to the risk associated with radioactive waste storage and disposal. ... (21)In the case of adsorption, where the U redox state does not change, differences between the coordination environments of the adsorbed and dissolved U(VI) species are suggested to be responsible for the isotope effect. ... We expect little isotope fractionation occurs with adsorption of uranyl carbonato and calcium-uranyl carbonato complexes, as outer-sphere complexes should not alter the local U(VI) environment. ...

Alyssa E. Shiel; Parker G. Laubach; Thomas M. Johnson; Craig C. Lundstrom; Philip E. Long; Kenneth H. Williams

2013-02-05T23:59:59.000Z

288

Improved oxidation sulfidation resistance of Fe-Cr-Ni alloys  

DOE Patents [OSTI]

High temperature resistance of Fe-Cr-Ni alloy compositions to oxidative and/or sulfidative conditions is provided by the incorporation of about 1 to 8 wt % of Zr or Nb and results in a two-phase composition having an alloy matrix as the first phase and a fine grained intermetallic composition as the second phase. The presence and location of the intermetallic composition between grains of the matrix provides mechanical strength, enhanced surface scale adhesion, and resistance to corrosive attack between grains of the alloy matrix at temperatures of 500 to 1000/sup 0/C.

Natesan, K.; Baxter, D.J.

1983-07-26T23:59:59.000Z

289

Bimetallic FeNi Oxygen Carriers for Chemical Looping Combustion  

Science Journals Connector (OSTI)

(2-4) In CLC (schematic in Figure 1), a fuel is combusted in a fuel reactor (reducer) in contact with an oxygen carrier (typically a metal oxide). ... After combustion of the fuel, the reduced metal is then transferred to the air reactor (oxidizer) where it is reoxidized by air, and then circulated back to the reducer to close the material loop. ... Son, S. R.; Kim, S. D.Chemical-looping combustion with NiO and Fe2O3 in a thermobalance and circulating fluidized bed reactor with double loops Ind. Eng. ...

Saurabh Bhavsar; Gtz Veser

2013-05-20T23:59:59.000Z

290

Stable atomic structure of NiTi austenite  

SciTech Connect (OSTI)

Nitinol (NiTi), the most widely used shape-memory alloy, exhibits an austenite phase that has yet to be identified. The usually assumed austenitic structure is cubic B2, which has imaginary phonon modes, hence it is unstable. We suggest a stable austenitic structure that on average has B2 symmetry (observed by x-ray and neutron diffraction), but it exhibits finite atomic displacements from the ideal B2 sites. The proposed structure has a phonon spectrum that agrees with that from neutron scattering, has diffraction spectra in agreement with x-ray diffraction, and has an energy relative to the ground state that agrees with calorimetry data.

Zarkevich, Nikolai A [Ames Laboratory; Johnson, Duane D [Ames Laboratory

2014-08-01T23:59:59.000Z

291

Semiconducting p-type MgNiO:Li epitaxial films fabricated by cosputtering method  

SciTech Connect (OSTI)

Li-doped ternary Mg{sub x}Ni{sub 1-x}O thin films were deposited on (0001) Al{sub 2}O{sub 3} substrates by a radio frequency (RF) magnetron cosputtering method with MgO and NiO:Li targets. The Mg mole fraction and Li content were relatively controlled by changing RF power for the MgO target over a range of 0-300 W, while the NiO:Li target was kept at 150 W. As a result, all films were epitaxially grown on (0001) Al{sub 2}O{sub 3} substrates with the relationship of [110]{sub NiO}||[1110]{sub Al2O3}, [112]{sub NiO}||[2110]{sub Al2O3} (in-plane), and [111]{sub NiO}||[0001]{sub Al2O3} (out-of-plane), and showed p-type semiconducting properties. Furthermore, from x-ray diffraction patterns, the authors found that MgO was effectively mixed with NiO:Li without structural deformation due to low lattice mismatch (0.8%) between NiO and MgO. However, the excess Li contents degraded the crystallinity of the MgNiO films. The band-gap of films was continuously shifted from 3.66 eV (339 nm) to 4.15 eV (299 nm) by the RF power of the MgO target. A visible transmittance of more than 80% was exhibited at RF powers higher than 200 W. Ultimately, the electrical resistivity of p-type MgNiO films was improved from 7.5 to 673.5 {Omega}cm, indicating that the Li-doped MgNiO films are good candidates for transparent p-type semiconductors.

Kwon, Yong Hun; Chun, Sung Hyun; Cho, Hyung Koun [School of Advanced Materials Science and Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of)

2013-07-15T23:59:59.000Z

292

Process and properties of electroless Ni-Cu-P-ZrO{sub 2} nanocomposite coatings  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer The Ni-P and Ni-P-Cu-ZrO{sub 2} coatings were produced by electroless technique. Black-Right-Pointing-Pointer The influence of copper and ZrO{sub 2} nanoparticles on Ni-P was studied. Black-Right-Pointing-Pointer Surface morphology, structure and electrochemical behavior were evaluated. Black-Right-Pointing-Pointer The Ni-Cu-P-ZrO{sub 2} and Ni-P-ZrO{sub 2} coatings are more resistant to corrosion than Ni-P. Black-Right-Pointing-Pointer Introduction of Cu and ZrO{sub 2} in the matrix aids to the enhancement of microhardness. -- Abstract: Electroless Ni-Cu-P-ZrO{sub 2} composite coating was successfully obtained on low carbon steel matrix by electroless plating technique. Coatings with different compositions were obtained by varying copper as ternary metal and nano sized zirconium oxide particles so as to obtain elevated corrosion resistant Ni-P coating. Microstructure, crystal structure and composition of deposits were analyzed by SEM, EDX and XRD techniques. The corrosion behavior of the deposits was studied by anodic polarization, Tafel plots and electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution. The ZrO{sub 2} incorporated Ni-P coating showed higher corrosion resistance than plain Ni-P. The introduction of copper metal into Ni-P-ZrO{sub 2} enhanced the protection ability against corrosion. The influence of copper metal and nanoparticles on microhardness of coatings was evaluated.

Ranganatha, S. [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India)] [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Venkatesha, T.V., E-mail: drtvvenkatesha@yahoo.co.uk [Department of Studies in Chemistry, School of Chemical Sciences, Kuvempu University, Shankaraghatta 577451, Shimoga, Karnataka (India); Vathsala, K. [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)] [Nanotribology Laboratory, Mechanical engineering department, Indian Institute of Science, Bangalore (India)

2012-03-15T23:59:59.000Z

293

[Ni(H{sub 2}O){sub 4}]{sub 3}[U(OH,H{sub 2}O)(UO{sub 2}){sub 8}O{sub 12}(OH){sub 3}], crystal structure and comparison with uranium minerals with U{sub 3}O{sub 8}-type sheets  

SciTech Connect (OSTI)

The new U(VI) compound, [Ni(H{sub 2}O){sub 4}]{sub 3}[U(OH,H{sub 2}O)(UO{sub 2}){sub 8}O{sub 12}(OH){sub 3}], was synthesized by mild hydrothermal reaction of uranyl and nickel nitrates. The crystal-structure was solved in the P-1 space group, a=8.627(2), b=10.566(2), c=12.091(4) A and alpha=110.59(1), beta=102.96(2), gamma=105.50(1){sup o}, R=0.0539 and wR=0.0464 from 3441 unique observed reflections and 151 parameters. The structure of the title compound is built from sheets of uranium polyhedra closely related to that in beta-U{sub 3}O{sub 8}. Within the sheets [(UO{sub 2})(OH)O{sub 4}] pentagonal bipyramids share equatorial edges to form chains, which are cross-linked by [(UO{sub 2})O{sub 4}] and [UO{sub 4}(H{sub 2}O)(OH)] square bipyramids and through hydroxyl groups shared between [(UO{sub 2})(OH)O{sub 4}] pentagonal bipyramids. The sheets are pillared by sharing the apical oxygen atoms of the [(UO{sub 2})(OH)O{sub 4}] pentagonal bipyramids with the oxygen atoms of [NiO{sub 2}(H{sub 2}O){sub 4}] octahedral units. That builds a three-dimensional framework with water molecules pointing towards the channels. On heating [Ni(H{sub 2}O){sub 4}]{sub 3}[U(OH,H{sub 2}O)(UO{sub 2}){sub 8}O{sub 12}(OH){sub 3}] decomposes into NiU{sub 3}O{sub 10}. - Graphical abstract: The framework of [Ni(H{sub 2}O){sub 4}]{sub 3}[U(OH,H{sub 2}O)(UO{sub 2}){sub 8}O{sub 12}(OH){sub 3}] built from uranium polyhedra sheets pillared by Ni-centered octahedra.

Rivenet, Murielle, E-mail: Murielle.rivenet@ensc-lille.f [Unite de Catalyse et de Chimie du Solide, Equipe Chimie du Solide, UCCS UMR CNRS 8181, USTL, ENSC-B.P. 90108, 59652 Villeneuve d'Ascq Cedex (France); Vigier, Nicolas; Roussel, Pascal; Abraham, Francis [Unite de Catalyse et de Chimie du Solide, Equipe Chimie du Solide, UCCS UMR CNRS 8181, USTL, ENSC-B.P. 90108, 59652 Villeneuve d'Ascq Cedex (France)

2009-04-15T23:59:59.000Z

294

TSNo s02-roberts104537-O Microscopic and Spectroscopic Speciation of Ni in Soils in the Vicinity of a Ni Refinery.  

E-Print Network [OSTI]

in the Vicinity of a Ni Refinery. abstract Accurately predicting the fate and bioavailability of metals in smelter REFINERY ASA-CSSA-SSSA Annual Meetings - October 21 - 25, 2001 - Charlotte, NC #12;

Sparks, Donald L.

295

Self-assembly of Ni nanocrystals on HfO{sub 2} and N-assisted Ni confinement for nonvolatile memory application  

SciTech Connect (OSTI)

We demonstrate memory property using Ni nanocrystals with mean diameter of 9 nm embedded in HfO{sub 2} high-k dielectric that are formed via a self-assembly process by sputtering and rapid thermal annealing. X-ray photoelectron spectroscopy shows that Ni penetrates into the 5 nm HfO{sub 2} after high temperature annealing above 800 deg. C in N{sub 2}. However, the diffusion is suppressed by N incorporation into HfO{sub 2} by NH{sub 3} annealing. Metal-oxide-semiconductor structures were fabricated with Ni nanocrystals embedded in HfO{sub 2}. An additional counterclockwise hysteresis of 2.1 V due to the charge trapping properties of the Ni nanocrystals was observed from a {+-}5 V sweep during capacitance-voltage electrical measurement.

Tan, Zerlinda; Samanta, S.K.; Yoo, Won Jong; Lee, Sungjoo [Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 (Singapore)

2005-01-03T23:59:59.000Z

296

Verification of Ni magnetic moment in GdNi2 Laves phase by magnetic circular dichroism measurement  

Science Journals Connector (OSTI)

Investigation of the magnetic moment of nickel in the polycrystal GdNi2 Laves phase was carried out by means of magnetic circular dichroism (MCD) in the core-level x-ray-absorption spectroscopy. It was revealed that the nickel magnetic moment originating from the 3d state (band) does exist and couples antiparallel to that of gadolinium whose MCD was observed at the M4,5 absorption edge. That is, nickel retains an intrinsic magnetic moment even in the Laves phase concentration. Furthermore, by analyzing in terms of sum rule, the contribution of spin and orbital magnetic moments to the magnetic moment was evaluated and discussed.

M. Mizumaki; K. Yano; I. Umehara; F. Ishikawa; K. Sato; A. Koizumi; N. Sakai; T. Muro

2003-04-09T23:59:59.000Z

297

Suppression of carbon formation in steam reforming of methane by addition of Co into Ni/ZrO2 catalysts  

Science Journals Connector (OSTI)

We investigated the steam reforming of methane (SRM) over various NiCo bimetallic catalysts...2...to determine whether the addition of Co on the Ni catalyst suppressed carbon formation. The effect of metal loadin...

Dasika Harshini; Yongchai Kwon; Jonghee Han

2010-03-01T23:59:59.000Z

298

Influence of the magnetic phase transition on secondary ion emission from disordered Ni-Pd compounds of various compositions  

Science Journals Connector (OSTI)

Variations in secondary ion emission (SIE) from polycrystals of ferromagnetic disordered Ni-Pd compounds irradiated by argon ions with energy of 10 keV are studied experimentally. A considerable reduction in Ni+ ...

K. F. Minnebaev; K. A. Tolpin

2012-05-01T23:59:59.000Z

299

The Influence of Ni-Coated TiC on Laser-Deposited IN625 Metal Matrix Composites  

E-Print Network [OSTI]

The In?uence of Ni-Coated TiC on Laser-Deposited IN625 Metalwith Ni-coated and uncoated TiC reinforcement particles toand spatial distribution of TiC particles in the deposited

2010-01-01T23:59:59.000Z

300

LONG EXTREMAL RAYS AND SYMPLECTIC RESOLUTIONS N.I. Shepherd--Barron  

E-Print Network [OSTI]

LONG EXTREMAL RAYS AND SYMPLECTIC RESOLUTIONS N.I. Shepherd--Barron DPMMS, Cambridge University, 16 double points (RDPs) to higher dimen­ sions. 1 #12; 2 N.I. SHEPHERD--BARRON Theorem 2.1. Suppose that f components are quasi--projective. If A; B are closed subschemes of X; Y respectively, then Mor(X; Y ; A; B

Shepherd-Barron, Nick

Note: This page contains sample records for the topic "vi rgi ni" 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.


301

Microstructural Degradation of Ni-YSZ Anodes for Solid Oxide Fuel  

E-Print Network [OSTI]

Microstructural Degradation of Ni- YSZ Anodes for Solid Oxide Fuel Cells Karl Thydén Risø-PhD-32(EN 2008 #12;Author: Karl Thydén Title: Microstructural Degradation of Ni-YSZ Anodes for Solid Oxide Fuel Cells Department: Fuel Cells and Solid State Chemistry Department Risø-PhD-32(EN) March 2008 This thesis

302

Characterization of the Ni-Cr Alloy Prepared by Laser Cladding Method  

Science Journals Connector (OSTI)

The laser cladding Ni-Cr alloy was prepared by adding nickel coated chromium composite powders on the surface of 45 steel using the laser cladding method. The component and microstructure were investigated by EDS, SEM, and HRTEM. The results show that ... Keywords: Ni-Cr alloy, laser cladding, characterization

Rui Yang; Dongjian Gao; Zhijia Qu

2012-07-01T23:59:59.000Z

303

Glass Forming Ability in Pr-(Cu, Ni)-Al Alloys  

E-Print Network [OSTI]

Glass forming ability (GFA) in the Pr-rich Pr-(Cu, Ni)-Al alloys at or near the eutectic points was systematically studied. It was found that the GFA in the pseudo-ternary alloys of Pr-(Cu, Ni)-Al is higher than that of ...

Zhang, Yong

304

Thermal analysis of nickel/metal (Ni/MH) hydride battery during charge cycle  

Science Journals Connector (OSTI)

A three-dimensional mathematical model containing temporal and spatial coordinates is presented for analyzing the thermal behavior and obtaining the internal temperature profile of cylindrical Ni/MH battery. This model is performed to investigate the ... Keywords: Ni/MH battery, charge, heat transfer coefficient, thermal analysis

Nabi Jahantigh; Ebrahim Afsharia

2008-02-01T23:59:59.000Z

305

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang  

E-Print Network [OSTI]

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang could be viable alternatives to reversible hydrogen storage. It is demonstrated that a single Ni coated-dispersed fullerenes are considered to be the novel hydrogen storage media capable of storing 6.8 wt % H2, thus

Goddard III, William A.

306

Oxygen driven reconstruction dynamics of Ni,,977... measured by time-lapse scanning tunneling microscopy  

E-Print Network [OSTI]

Oxygen driven reconstruction dynamics of Ni,,977... measured by time-lapse scanning tunneling-lapse scanning tunneling microscopy STM has been used to observe the oxygen induced reconstruction behavior of Ni for the merging of steps in the presence of small amounts of adsorbed oxygen, less than 2% of a monolayer. Point

Sibener, Steven

307

Robert S. Boyd William J. Moar The defensive function of Ni in plants  

E-Print Network [OSTI]

Robert S. Boyd á William J. Moar The defensive function of Ni in plants: response- gens (Boyd and Martens 1992). By manipulating soil metal content to produce high- and low-metal plants, Boyd and Martens (1994) demonstrated acute toxicity of high-metal leaves of the Ni hyperaccumulator Thl

Boyd, Robert S.

308

Atomic data and spectral line intensities for Ni XVII  

SciTech Connect (OSTI)

Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XVII. We include in the calculations the 23 lowest configurations, corresponding to 159 fine-structure levels: 3l3l', 3l4l'', and 3s5l''', with l, l' = s, p, d, l'' = s, p, d, f, and l''' = s, p, d. Collision strengths are calculated at five incident energies for all transitions at varying energies above the threshold of each transition. One additional energy, very close to the threshold of each transition, has also been included. Calculations have been carried out using the Flexible Atomic Code in the distorted wave approximation. Additional calculations have been performed with the University College London suite of codes for comparison. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates of the present work, statistical equilibrium equations for level populations are solved at electron densities covering the range of 10{sup 8} - 10{sup 14} cm{sup -3} and at an electron temperature of log T{sub e}(K) = 6.5, corresponding to the maximum abundance of Ni XVII. Spectral line intensities are calculated, and their diagnostic relevance is discussed. This dataset will be made available in the next version of the CHIANTI database.

Bhatia, A.K. [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Landi, E., E-mail: elandi@umich.ed [Naval Research Laboratory, Washington, DC 20375 (United States); University of Michigan, Ann Arbor, MI 48109 (United States)

2011-05-15T23:59:59.000Z

309

Electric Automobile Ni-MH Battery Investigation in Diverse Situations  

Science Journals Connector (OSTI)

Abstract The electronic differential system ensures the robust control of the vehicle comportment on the road. This paper focuses Ni-MH Battery controlled by Buck Boost DC-DC converter power supply for EV. Sliding mode control based on space vector modulation (SVM-SMC) is proposed to achieve the tow rear driving wheel control. The performances of the proposed strategy controller give a satisfactory simulation results. The proposed control law increases the utility EV autonomous under several speed variations. Moreover, the future industrial's vehicle must take into considerations the battery material choice into design steps. The battery material model choice is a crucial item, and thanks to an increasing emphasis on vehicle range and performance, the Ni-MH battery could become a viable candidate that's our proposal battery model in the present work, in this way the present paper show a novel strategy of electric automobile (EA) power electronics studies when the current battery take into account the impact of the sliding mode control based onspace vector machine technique in the several speed variations using the primitive battery SOC of 60% state.

Brahim Mebarki; Belkacem Draoui; Lakhdar Rahmani; Boumedine Allaoua

2013-01-01T23:59:59.000Z

310

Computed oscillator strengths and energy levels for Fe III, Fe IV, Fe V, and Fe VI with calculated wavelengths and wavelengths derived from established data  

Science Journals Connector (OSTI)

Calculated weighted oscillator strengths are tabulated for spectral lines of Fe III, Fe IV, Fe V, and Fe VI. The lines belong to transition arrays 3d6-3d54p and 3d54s-3d54p in Fe III, 3d5-3d44p and 3d44s-3d44p in Fe IV, 3d4-3d34p and 3d34s-3d34p in Fe V, and 3d3-3d24p and 3d24s-3d24p in Fe VI. For the calculations, Slater parameters are optimized on the basis of minimizing the discrepancies between observed and computed wavelengths. Configuration interaction was included among the 3dn, 3dn?14s, 3dn?24s2, 3dn?14d, and 3dn?15s even configurations and among the 3dn?14p, 3dn?24s4p, and 3dn?15p odd configurations, with 3p53dn+1 added for Fe VI. Calculated wavelengths are compared with observational data, and the compositions of energy levels are listed. This completes a series of similar computations for these complex configurations covering Fe I to Fe VI.

B.C. Fawcett

1989-01-01T23:59:59.000Z

311

VI Simpsio Brasileiro de Solos No Saturados 2007/ Salvador-Bahia 421 Relao Entre a Resistncia a Trao Obtida via Ensaio  

E-Print Network [OSTI]

VI Simpósio Brasileiro de Solos Não Saturados 2007/ Salvador-Bahia 421 Relação Entre a Resistência Saturados 2007/ Salvador-Bahia uma maior atenção vem sendo dada a este tipo de mecanismo, especialmente por

Zornberg, Jorge G.

312

Preservation of Our World in the Wake of Change, Vol. VI A/B ISEEQS Pub. Jerusalem, Israel, 1996. Editor: Y. Steinberger  

E-Print Network [OSTI]

553 Preservation of Our World in the Wake of Change, Vol. VI A/B ISEEQS Pub. Jerusalem, Israel, Jerusalem 91904, Israel and G. Schiller Department of Field Crops and Natural Resources, Agricultural components. In wind- dispersed species, for example, selection for dispersal capacity may often favor small

Nathan, Ran

313

Coordination structures of lanthanide(III) and uranyl(VI) nitrato complexes with N,N?-dimethyl-N,N?-dibutylmalonamide. Part II  

Science Journals Connector (OSTI)

The coordination structures of lanthanide(III) and uranyl(VI) nitrato complexes with N,N?-dimethyl-N,N?-dibutylmalonamide (DMDBMA) were investigated in terms of 1H, 13C and 14N NMR measurements, infrared spectrum, molar conductivity measurement, absorption spectrum, fluorescence spectrum, magnetic susceptibility measurement and thermal analysis. The chemical formulae of the isolated lanthanide(III) and uranyl(VI) nitrato-DMDBMA complexes are Ln(NO3)3 2DMDBMA and UO2(NO3)2 DMDBMA, respectively. The DMDBMA coordinates to the lanthanide(III) and uranyl(VI) ions, with the oxygen atoms of carbonyl group and nitrate ions coordinate to the central metal ions in a bidentate manner. For the lanthanide(III) nitrato complexes, the coordination number is ten, and a change of the coordination structure occurs between the lighter and heavier complexes. The uranyl(VI) nitrato-DMDBMA complex has an eight-coordinated structure with the uranyl group surrounded by six oxygen atoms, four from the bidentate nitrate groups and two from the bidentate DMDBMA, lying in the plane perpendicular to the axial uranyl group.

Takashi Nakamura; Chie Miyake

1996-01-01T23:59:59.000Z

314

Bulk Power System Dynamics and Control VI, August 22-27, 2004, Cortina d'Ampezzo, Italy Voltage Stability Enhancement via Model Predictive  

E-Print Network [OSTI]

Bulk Power System Dynamics and Control VI, August 22-27, 2004, Cortina d'Ampezzo, Italy Voltage of the North American power system in August 2003 could have been avoided by tripping a relatively small amount be more palatable. Recent advances in communications and computer systems facilitate such non-disruptive

Hiskens, Ian A.

315

Mass Measurements of Proton-Rich Nuclei Fe-50 and Ni-54  

E-Print Network [OSTI]

, and target thicknesses determined the Q-value scales shown in Fig. 2. The resulting Q values and mass excesses (all in MeV) are Q("Fe) =-50..95+0.06, M(SOFe) =-34.48+0.06 and Q("Ni) = -50.19+0.05, M("Ni) =-39.21 +0.05, with the mass results based on a... Station, Texas 77843 {Received 6 December 1976) The reactions "Fe{'He,'He)' Fe and "Ni{'He,'He)"Ni have been observed at an incident a energy of 110 MeV. The reaction Q values are found to be Q{ Fe) = ?50.95 + 0.06 MeV and Q{' Ni) = ?50.19 + 0.05 Me...

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

1977-01-01T23:59:59.000Z

316

Effect of hydrogenation on magnetic and electronic behaviour of Pr-Ni  

SciTech Connect (OSTI)

Magnetic and electronic properties of PrNi and PrNi-H have been investigated by using first principles approach. The ground state of both the compounds is base-centered orthorhombic CrB structure. Calculations are performed using full potential linearized augmented plane wave plus local orbitals (FP-L/APW) method including spin-polarization within the frame work of density functional theory (DFT). The electronic exchange-correlation energy is described by generalized gradient approximation (GGA). The hydrogen stored in PrNi, i.e., PrNi-H has been studied to analyze the effective changes in magnetic moments and electronic structures in comparison to PrNi. A comparative study of the density of states in both the compounds has also been presented.

Rana, Pooja, E-mail: poojafizix@yahoo.com; Singh, Sanjay K., E-mail: poojafizix@yahoo.com; Verma, U. P., E-mail: poojafizix@yahoo.com [School of Studies in Physics, Jiwaji University, Gwalior-474011 (India)

2014-04-24T23:59:59.000Z

317

Orbital Degeneracy Removed by Charge Order in Triangular Antiferromagnet AgNiO{sub 2}  

SciTech Connect (OSTI)

We report a high-resolution neutron diffraction study on the orbitally degenerate spin-1/2 hexagonal metallic antiferromagnet AgNiO{sub 2}. A structural transition to a tripled unit cell with expanded and contracted NiO{sub 6} octahedra indicates {radical}(3)x{radical}(3) charge order on the Ni triangular lattice. This suggests charge order as a possible mechanism of lifting the orbital degeneracy in the presence of charge fluctuations, as an alternative to the more usual Jahn-Teller distortions. A novel magnetic ground state is observed at low temperatures with the electron-rich S=1 Ni sites arranged in alternating ferromagnetic rows on a triangular lattice, surrounded by a honeycomb network of nonmagnetic and metallic Ni ions. We also report first-principles band-structure calculations that explain microscopically the origin of these phenomena.

Wawrzynska, E.; Coldea, R. [H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom); Wheeler, E. M. [Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Institute Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9 (France); Mazin, I. I.; Johannes, M. D. [Code 6393, Naval Research Laboratory, Washington, D.C. 20375 (United States); Soergel, T.; Jansen, M. [Max-Planck Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany); Ibberson, R. M.; Radaelli, P. G. [ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom)

2007-10-12T23:59:59.000Z

318

Magnetism of NiMn2O4-Fe3O4 spinel interfaces  

SciTech Connect (OSTI)

We investigate the magnetic properties of the isostructural spinel-spinel interface of NiMn{sub 2}O{sub 4}(NMO)-Fe{sub 3}O{sub 4}. Although the magnetic transition temperature of the NMO film is preserved, both bulk and interface sensitive measurements demonstrate that the interface exhibits strong interfacial magnetic coupling up to room temperature. While NMO thin films have a ferrimagnetic transition temperature of 60 K, both NiFe{sub 2}O{sub 4} and MnFe{sub 2}O{sub 4} are ferrimagnetic at room temperature. Our experimental results suggest that these magnetic properties arise from a thin interdiffused region of (Fe,Mn,Ni){sub 3}O{sub 4} at the interface, leading to Mn and Ni magnetic properties similar to those of MnFe{sub 2}O{sub 4} and NiFe{sub 2}O{sub 4}.

Arenholz, Elke; Nelson-Cheeseman, B. B.; Chopdekar, R. V.; Bettinger, J. S.; Arenholz, E.; Suzuki, Y.

2007-09-13T23:59:59.000Z

319

PII S0016-7037(99)00244-6 The role of Al in the formation of secondary Ni precipitates  

E-Print Network [OSTI]

is dissolved from the sorbent and substitutes for Ni in brucite-like hydroxide layers of the newly forming

Sparks, Donald L.

320

Detection and Quantification of Pu(III, IV, V, and VI) Using a1.0-meter Liquid Core Waveguide  

SciTech Connect (OSTI)

Detection and quantification of the aquo ions of Pu in 1 MHClO4 was carried out using a 1-meter liquid core waveguide (LCW) coupledto a fiber optic UV-Vis spectrometer. Detection limits of 7 x 10-7 M forPu(VI), 1.6 x 10-5 M for Pu(V), 5 x 10-6 M for Pu(IV) and 8 x 10-6 M forPu(III) were achieved. The limits of detection represent increases of 18to 33 times those achievable using a conventional 1-cm path length.Because of the much lower detection limits of the LCW, routineidentification of the oxidation states in dilute Pu solutions can bemade.

Wilson, Richard E.; Hu, Yung-Jin; Nitsche, Heino

2005-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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

Analysis of radiation exposure for troop observers, Exercise Desert Rock VI, Operation Teapot. Final report 1 Mar-15 Jul 80  

SciTech Connect (OSTI)

The radiation doses to troop observers and volunteer observers for Exercise Desert Rock VI are reconstructed for each applicable shot of Operation Teapot (1955). Initial neutron and gamma radiation doses are determined from transport codes ATR4 and ATR4.1. Residual radiation contours and decay rates are established through a new automated procedure that utilizes raw data in regression analysis to fit space-time models. Troop operations data are combined with the radiological data to determine integrated dose. Uncertainties are calculated for each parameter. The volunteers received the highest observer--1.6 rem gamma and 4.5 rem neutron. The highest dose received by troop observers was 1.4 rem gamma and 1.4 rem neutron at Shot Tesla.

Goetz, J.; McGahan, J.; Kaul, D.; Weitz, R.; Klemm, J.

1980-07-15T23:59:59.000Z

322

Microstructure and thermal conductivity of surfactant-free NiO nanostructures  

SciTech Connect (OSTI)

High purity, nanometer sized surfactant-free nickel oxide (NiO) particles were produced in gram scale using a solution combustion method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), gas pycnometry and gas adsorption analysis (BET). The average particle size of the as-synthesized NiO increases significantly with the preheating temperature of the furnace, while the specific surface area decreases. A BET specific surface area of {approx}100 m{sup 2}/g was obtained for NiO nanoparticles with size as small as 3 nm synthesized at 300 Degree-Sign C. The thermal conductivity ({kappa}) of pressed pellets of the synthesized NiO nanoparticles obtained using spark plasma sintering (SPS) and uniaxial hot pressing is drastically decreased ({approx}60%) compared to that of NiO single crystal. This strong reduction in {kappa} with particle size suggests the suitability of the synthesized surfactant-free NiO nanoparticles for use as nanoinclusions when designing high performance materials for waste heat recovery. - Graphical abstract: Highly efficient phonon scattering by surfactant-free NiO nanostructures obtained by solution combustion of a mixture of nickel (II) nitrate hexahydrate (oxidizer) and urea (fuel) at various temperatures. Highlights: Black-Right-Pointing-Pointer Fast synthesis of surfactant-free NiO nanoparticles with controllable size. Black-Right-Pointing-Pointer High specific surface area for NiO nanoparticles with size range from 3 to 7 nm. Black-Right-Pointing-Pointer Strong reduction of the thermal conductivity with decreasing particle size. Black-Right-Pointing-Pointer NiO as nanoinclusions in high performance materials for energy conversion.

Sahoo, Pranati [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Department of Chemistry, University of New Orleans, New Orleans, LA 70148 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Misra, Dinesh K. [The Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Salvador, Jim [Chemical Sciences and Materials Systems Laboratory, General Motors R and D Center, Warren, MI 48090 (United States); Makongo, Julien P.A. [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Chaubey, Girija S. [Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Takas, Nathan J. [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Wiley, John B. [Department of Chemistry, University of New Orleans, New Orleans, LA 70148 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States); Poudeu, Pierre F.P., E-mail: ppoudeup@umich.edu [Laboratory for Emerging Energy and Electronic Materials, Materials Science and Engineering Department, University of Michigan, Ann Arbor, MI 48109 (United States); Department of Chemistry, University of New Orleans, New Orleans, LA 70148 (United States); Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States)

2012-06-15T23:59:59.000Z

323

Development of FeNiMoB thin film materials for microfabricated magnetoelastic sensors  

SciTech Connect (OSTI)

Metglas{sup TM} 2826MB foils of 25-30 {mu}m thickness with the composition of Fe{sub 40}Ni{sub 38}Mo{sub 4}B{sub 18} have been used for magnetoelastic sensors in various applications over many years. This work is directed at the investigation of {approx}3 {mu}m thick iron-nickel-molybdenum-boron (FeNiMoB) thin films that are intended for integrated microsystems. The films are deposited on Si substrate by co-sputtering of iron-nickel (FeNi), molybdenum (Mo), and boron (B) targets. The results show that dopants of Mo and B can significantly change the microstructure and magnetic properties of FeNi materials. When FeNi is doped with only Mo its crystal structure changes from polycrystalline to amorphous with the increase of dopant concentration; the transition point is found at about 10 at. % of Mo content. A significant change in anisotropic magnetic properties of FeNi is also observed as the Mo dopant level increases. The coercivity of FeNi films doped with Mo decreases to a value less than one third of the value without dopant. Doping the FeNi with B together with Mo considerably decreases the value of coercivity and the out-of-plane magnetic anisotropy properties, and it also greatly changes the microstructure of the material. In addition, doping B to FeNiMo remarkably reduces the remanence of the material. The film material that is fabricated using an optimized process is magnetically as soft as amorphous Metglas{sup TM} 2826MB with a coercivity of less than 40 Am{sup -1}. The findings of this study provide us a better understanding of the effects of the compositions and microstructure of FeNiMoB thin film materials on their magnetic properties.

Liang Cai; Gooneratne, Chinthaka; Cha, Dongkyu; Chen Long; Kosel, Jurgen [Computer Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology, 4700 KAUST, Thuwal 23955 (Saudi Arabia); Gianchandani, Yogesh [Department of Electrical Engineering and Computer Science, 1301 Beal Ave., University of Michigan, Ann Arbor, Michigan 48109 (United States)

2012-12-01T23:59:59.000Z

324

State of Ni in catalysts for glycerol hydrogenation and methane steam reforming as studied by X-ray absorption spectroscopy  

Science Journals Connector (OSTI)

X-ray absorption spectroscopy is used to study 1% Ni/Al2O3, 5% Ni/Al2O3, and 5% Ni/TiO2 catalysts for glycerol and methane conversion. The effect of treatment in H2 under microwave irradiation on the reduction of...

O. P. Tkachenko; L. M. Kustov

2013-06-01T23:59:59.000Z

325

The interfacial reaction of Ni on (100) Si???xGex (x=0, 0.25) and (111) Ge  

E-Print Network [OSTI]

The interfacial reaction of Ni with Si, Si?.??Ge?.??, and Ge at 400C has been investigated. A uniform epitaxial NiSi film was obtained at 400C for Ni-Silicidation on Si using rapid thermal annealing method. Similarly, ...

Jin, Lijuan

326

Na, Mg, Ni and Cs distribution and speciation after long-term alteration of a simulated nuclear waste glass  

E-Print Network [OSTI]

distribution and speciation of Na, Mg, Ni and Cs in a simulated (inactive) nuclear waste glass were studied and Cs represent dose determining long-lived radionuclides (59 Ni, 135 Cs) in vitrified nuclear wasteNa, Mg, Ni and Cs distribution and speciation after long-term alteration of a simulated nuclear

327

The influence of Pt redistribution on Ni{sub 1-x}Pt{sub x}Si growth properties  

SciTech Connect (OSTI)

We have studied the influence of Pt on the growth of Ni silicide thin films by examining the Pt redistribution during silicide growth. Three different initial Pt configurations were investigated, i.e., a Pt alloy (Ni+Pt/), a Pt capping layer (Pt/Ni/) and a Pt interlayer (Ni/Pt/), all containing 7 at. % Pt relative to the Ni content. The Pt redistribution was probed using in situ real-time Rutherford backscattering spectrometry (RBS) whereas the phase sequence was monitored during the solid phase reaction (SPR) using in situ real-time x-ray diffraction. We found that the capping layer and alloy exhibit a SPR comparable to the pure Ni/ system, whereas Pt added as an interlayer has a much more drastic influence on the Ni silicide phase sequence. Nevertheless, for all initial sample configurations, Pt redistributes in an erratic way. This phenomenon can be assigned to the low solubility of Pt in Ni{sub 2}Si compared to NiSi and the high mobility of Pt in Ni{sub 2}Si compared to pure Ni. Real-time RBS further revealed that the crucial issue determining the growth properties of each silicide phase is the Pt concentration at the Si interface during the initial stages of phase formation. The formation of areas rich in Pt reduce the Ni silicide growth kinetics which influences the phase sequence and properties of the silicides.

Demeulemeester, J.; Smeets, D.; Temst, K.; Vantomme, A. [Instituut voor Kern-en Stralingsfysica and INPAC, K.U.Leuven, Celestijnenlaan 200D, B-3001 Leuven (Belgium); Comrie, C. M. [Department of Physics, University of Cape Town, Rondebosch 7700 (South Africa); Van Bockstael, C.; Knaepen, W.; Detavernier, C. [Department of Solid State Sciences, Ghent University, B-9000 Gent (Belgium)

2010-08-15T23:59:59.000Z

328

Using direct hot-rolling approach to obtain dual-phase weathering steel CuPCrNiMo  

Science Journals Connector (OSTI)

A weathering steel CuPCrNiMo has been ... based on the continuous cooling transformation diagram of weathering steel CuPCrNiMo. The results show that the microstructures of DP weathering steels CuPCrNi...

Chunling Zhang; Dayong Cai; Bo Liao; Yunchang Fan

2010-01-01T23:59:59.000Z

329

Mechanism(s) of Ni Sorption on Al-Hydroxy-Interlayered Vermiculite Using Time-Resolved EXAFS  

E-Print Network [OSTI]

Mechanism(s) of Ni Sorption on Al-Hydroxy-Interlayered Vermiculite Using Time-Resolved EXAFS D. R role in retaining these compounds. However, little research has been done to investigate the sorption of Ni when reacted with Al-pillared vermiculite over various times. The sorption of Ni increased when

Sparks, Donald L.

330

INFLUENCE OF GIBBSITE SURFACE AREA AND CITRATE ON Ni SORPTION MECHANISMS AT pH 7.5  

E-Print Network [OSTI]

INFLUENCE OF GIBBSITE SURFACE AREA AND CITRATE ON Ni SORPTION MECHANISMS AT pH 7.5 NORIKO U the sorption of Ni to gibbsite of two different surface areas at pH 7.5, in the presence and absence of citrate to elucidate the sorption mechanisms at the molecular level. In agreement with former results, Ni-Al layered

Sparks, Donald L.

331

Stopping and radial flow in central 58Ni+58Ni collisions between 1A and 2A GeV  

Science Journals Connector (OSTI)

The production of charged pions, protons, and deuterons has been studied in central collisions of 58Ni on 58Ni at incident beam energies of 1.06A, 1.45A, and 1.93A GeV. The dependence of transverse-momentum and rapidity spectra on the beam energy and on the centrality of the collison is presented. It is shown that the scaling of the mean rapidity shift of protons established for between 10A and 200A GeV at the Brookhaven AGS and the CERN SPS accelerators energies is valid down to 1A GeV. The degree of nuclear stopping is discussed; quantum molecular dynamics calculations reproduce the measured proton rapidity spectra for the most central events reasonably well, but do not show any sensitivity between the soft and the hard equation of state. A radial flow analysis, using the midrapidity transverse-momentum spectra, delivers freeze-out temperatures T and radial flow velocities ?r which increase with beam energy up to 2A GeV; in comparison to the existing data of Au on Au over a large range of energies, only ?r shows a system size dependence.

B. Hong et al. ((FOPI Collaboration))

1998-01-01T23:59:59.000Z

332

High Temperature Oxidation Behavior of gamma-Ni+gamma'-Ni3Al Alloys and Coatings Modified with Pt and Reactive Elements  

SciTech Connect (OSTI)

Materials for high-pressure turbine blades must be able to operate in the high-temperature gases (above 1000 C) emerging from the combustion chamber. Accordingly, the development of nickel-based superalloys has been constantly motivated by the need to have improved engine efficiency, reliability and service lifetime under the harsh conditions imposed by the turbine environment. However, the melting point of nickel (1455 C) provides a natural ceiling for the temperature capability of nickel-based superalloys. Thus, surface-engineered turbine components with modified diffusion coatings and overlay coatings are used. Theses coatings are capable of forming a compact and adherent oxide scale, which greatly impedes the further transport of reactants between the high-temperature gases and the underlying metal and thus reducing attack by the atmosphere. Typically, these coatings contain {beta}-NiAl as a principal constituent phase in order to have sufficient aluminum content to form an Al{sub 2}O{sub 3} scale at elevated temperatures. The drawbacks to the currently-used {beta}-based coatings, such as phase instabilities, associated stresses induced by such phase instabilities, and extensive coating/substrate interdiffusion, are major motivations in this study to seek next-generation coatings. The high-temperature oxidation resistance of novel Pt + Hf-modified {gamma}-Ni + {gamma}-Ni{sub 3}Al-based alloys and coatings were investigated in this study. Both early-stage and 4-days isothermal oxidation behavior of single-phase {gamma}-Ni and {gamma}{prime}-Ni{sub 3}Al alloys were assessed by examining the weight changes, oxide-scale structures, and elemental concentration profiles through the scales and subsurface alloy regions. It was found that Pt promotes Al{sub 2}O{sub 3} formation by suppressing the NiO growth on both {gamma}-Ni and {gamma}{prime}Ni{sub 3}Al single-phase alloys. This effect increases with increasing Pt content. Moreover, Pt exhibits this effect even at lower temperatures ({approx}970 C) in the very early stage of oxidation. It was also inferred that Pt enhances the diffusive flux of aluminum from the substrate to the scale/alloy interface. Relatively low levels of hafnium addition to Pt-free {gamma}{prime}-Ni{sub 3}Al increased the extent of external NiO formation due to non-protective HfO{sub 2} formation. Accordingly, this effect intensified with increasing Hf content from 0.2 to 0.5 at.%.

Nan Mu

2007-12-01T23:59:59.000Z

333

U.S. DEPARTMENT OFENl!RGY EERE PROJECT MANAGEMENT CENTER Nl!PA DETlffiMINATION  

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

Nl!PA DETlffiMINATION Nl!PA DETlffiMINATION R[CIPIENT:New York State Energy Research and Development Authority PROJECf TITLE: Program Year 2012 Formula Grants - State Energy Program Page 1 of3 STATE: NY Funding Opportunity Announcement Numbel" Procurement Instrument Number NEPA Control Number CID Number DE-FOA-Q000643 R130772 GF0-0130772-OO1 Based on my review orlbe information concerning the proposed action, as NEPA Compliance Omen (authorized under DOE Order 451.1A), I hne made the following determination: ex, EA, EIS APPENDIX AND NUMBER: Description: All Technical advice and assistance to organization, A9 Information gathering, analysis, and dissemination Rational for determination: Technical advice and planning aSSistance to international, national, slate, and local organizations.

334

U.S. DEPARTMENT OFENl!RGY EERE PROJECT MANAGEMENT CENTER NEPA DE1'FIU.llNATION  

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

NEPA DE1'FIU.llNATION NEPA DE1'FIU.llNATION RECIPIENT:Colorado School of Mines Page 1 of2 STATE: CO PROJECf TITLE: Hot Carrier Collection in Thin Film Silicon with Tailored Nanocrystalline/Amorphous Structure Funding Opportunity Announcement Numbu Procurement Instrument Number NEPA Control Number elD Number OE-FOA-OOOO387 DE-EE0005326 GF0-0005326-001 0 Based on my review oftbe Information conccming the proposed action, as NEPA Compliance Officer (authorized under DOE Order 451.1A), I have made the follo",," ing determination: ex, EA, EIS APPENDIX AND NUMBER: Description: 8 3.15 Small-scale i ndoor research and development projects usIng nanascate materials Siting, construction, modrficabon, operation, and decommissioning of facilities for indoor small-scale research and

335

Renewable and alteRnative eneRgy Fact Sheet College of Agricultural Sciences Agricultural Research and Cooperative Extension  

E-Print Network [OSTI]

"(FAEE). introduction Biodiesel is a liquid fuel that is created by chemically process- ing vegetable oil and altering and blends. The companion fact sheet in this series Using Biodiesel Fuel in Your Engine explains Research and Cooperative Extension What's So Different about Biodiesel Fuel? 1. If the biodiesel is made

Boyer, Elizabeth W.

336

IMPACT Vol. 5 No. 1 | Spring 2010 CLeAn eneRGy DeMAnDS  

E-Print Network [OSTI]

and development are vital if America is to decrease greenhouse gas emissions at lower cost, reduce dependence and reduce environ- mental risks. The University of Maryland Energy Research Center, or UMERC, coordinates of Science and Technology Policy. Many of the major federal grants related to energy research, including

Hill, Wendell T.

337

Atomic data and spectral line intensities for Ni XI  

SciTech Connect (OSTI)

Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XI. We include in the calculations the 12 lowest configurations, corresponding to 180 fine-structure levels: 3s{sup 2}3p{sup 6}, s{sup 2}3p{sup 5}3d, 3s{sup 2}3p{sup 4}3d{sup 2}, 3s3p{sup 6}3d, 3s{sup 2}3p{sup 5}4l, and 3s3p{sup 6}4l with l = s, p, d, f. Collision strengths are calculated at five incident energies for all transitions: 7.45, 17.6, 31.4, 50.1, and 75.2 Ry above the threshold of each transition. An additional energy, very close to the transition threshold, has been added, whose value is between 0.0007 Ry and 0.25 Ry depending on the levels involved. Calculations have been carried out using the Flexible Atomic Code. The scattering problem is solved in the distorted wave approximation. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates of the present work, combined with close coupling collision excitation rate coefficients available in the literature for the lowest 17 levels, statistical equilibrium equations for level populations are solved at electron densities covering the range of 10{sup 8}-10{sup 14} cm{sup -3} and at an electron temperature of logT{sub e}K=6.1, corresponding to the maximum abundance of Ni XI. Spectral line intensities are calculated, and their diagnostic relevance is discussed. This dataset will be made available in the next version of the CHIANTI database.

Bhatia, A.K. [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Landi, E., E-mail: Landi@nrl.navy.mi [Naval Research Laboratory, Washington, DC 20375 (United States)

2011-01-15T23:59:59.000Z

338

Atomic data and spectral line intensities for Ni XV  

SciTech Connect (OSTI)

Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XV. We include in the calculations the 9 lowest configurations, corresponding to 126 fine structure levels: 3s{sup 2} 3p{sup 2}, 3s3p{sup 3}, 3s{sup 2} 3p3d, 3p{sup 4}, 3s3p{sup 2} 3d, and 3s{sup 2} 3p4l with l=,s,p,d,f. Collision strengths are calculated at five incident energies for all transitions: 7.8, 18.5, 33.5, 53.5, and 80.2 Ry above the threshold of each transition. An additional energy, very close to the transition threshold, has been added, whose value is between 0.004 and 0.28 Ry depending on the levels involved. Calculations have been carried out using the Flexible Atomic Code and the distorted-wave approximation. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates calculated in the present work, statistical equilibrium equations for level populations are solved at electron densities covering the 10{sup 8}-10{sup 14} cm{sup -3} range and at an electron temperature of logT{sub e}(K)=6.4, corresponding to the maximum abundance of Ni XV. Spectral line intensities are calculated, and their diagnostic relevance is discussed. This dataset will be made available in the next version of the CHIANTI database.

Landi, E., E-mail: elandi@umich.edu [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48109 (United States); Bhatia, A.K. [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)] [NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2012-07-15T23:59:59.000Z

339

NREL Improves Hole Transport in Sensitized CdS-NiO Nanoparticle Photocathodes (Fact Sheet)  

SciTech Connect (OSTI)

Significantly improved charge-collection efficiencies result from a general chemical approach to synthesizing photocathodes. It has been reported that a dye-sensitized nickel oxide (NiO) photocathode, when coupled to a dye-sensitized photoanode, could significantly increase overall solar conversion efficiency. However, the conversion efficiencies of these cells are still low. There has been much effort to improve the conversion efficiency by fabricating films with improved properties and developing more effective sensitizing dyes for p-type NiO. One of the factors limiting the use of NiO for solar cell application is the low hole conductivity in p-NiO. A team of researchers from the National Renewable Energy Laboratory (NREL) developed a general chemical approach to synthesize NiO-cadmium sulfide (CdS) core-shell nanoparticle films as photocathodes for p-type semiconductor-sensitized solar cells. Compared to dye-sensitized NiO photocathodes, the CdS-sensitized NiO cathodes exhibited two orders of magnitude faster hole transport (attributable to the passivation of surface traps by the CdS) and almost 100% charge-collection efficiencies.

Not Available

2012-01-01T23:59:59.000Z

340

Cysteine 295 indirectly affects Ni coordination of carbon monoxide dehydrogenase-II C-cluster  

SciTech Connect (OSTI)

Highlights: CODH-II harbors a unique [Ni-Fe-S] cluster. We substituted the ligand residues of Cys{sup 295} and His{sup 261}. Dramatic decreases in Ni content upon substitutions were observed. All substitutions did not affect Fe-S clusters assembly. CO oxidation activity was decreased by the substitutions. -- Abstract: A unique [NiFeS] cluster (C-cluster) constitutes the active center of Ni-containing carbon monoxide dehydrogenases (CODHs). His{sup 261}, which coordinates one of the Fe atoms with Cys{sup 295}, is suggested to be the only residue required for Ni coordination in the C-cluster. To evaluate the role of Cys{sup 295}, we constructed CODH-II variants. Ala substitution for the Cys{sup 295} substitution resulted in the decrease of Ni content and didnt result in major change of Fe content. In addition, the substitution had no effect on the ability to assemble a full complement of [FeS] clusters. This strongly suggests Cys{sup 295} indirectly and His{sup 261} together affect Ni-coordination in the C-cluster.

Inoue, Takahiro; Takao, Kyosuke; Yoshida, Takashi [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)] [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan); Wada, Kei [Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692 (Japan)] [Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-1692 (Japan); Daifuku, Takashi; Yoneda, Yasuko [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)] [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan); Fukuyama, Keiichi [Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)] [Department of Biological Sciences, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan); Sako, Yoshihiko, E-mail: sako@kais.kyoto-u.ac.jp [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)] [Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502 (Japan)

2013-11-08T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" from the National Library of EnergyBeta (NLEBeta).
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341

NiO(111) nanosheets as efficient and recyclable adsorbents for dye pollutant removal from  

Science Journals Connector (OSTI)

Semiconductor single-crystalline polar NiO(111) nanosheets with well-defined hexagonal holes have been investigated for application in dye adsorption and combustion processes. With regard to adsorption technologies, high surface area metal oxides have an advantage over activated carbon in that the adsorbed species can be combusted and the adsorbent reused in the case of metal oxides while regeneration of activated carbon remains challenging and thus the adsorbent/adsorbate system must be disposed of. Here, three typical textile dyes, reactive brilliant red X-3B, congo red and fuchsin red, were studied for removal from wastewater with two NiO systems and activated carbon. These studies revealed that the NiO(111) nanosheets exhibited much more favorable adsorptive properties than conventionally prepared nickel oxide powder (CP-NiO) obtained from thermal decomposition of nickel nitrate. The maximum adsorption capabilities of the three dyes on NiO(111) nanosheets reached 30.4mgg?1, 35.15mgg?1 and 22mgg?1 for reactive brilliant red X-3B, congo red and fuchsin acid, respectively, while the maximum adsorption capabilities of the three dyes on CP-NiO were only 8.4, 13.2 and 12mgg?1 for reactive brilliant red X-3B, congo red and fuchsin acid. To simulate the adsorption isotherm, two commonly employed models, the Langmuir and the Freundlich isotherms, were selected to explicate the interaction of the dye and NiO(111). The isotherm evaluations revealed that the Langmuir model demonstrated better fit to experimental equilibrium data than the Freundlich model. The maximum predicted adsorption capacity was 36.1mgg?1. In addition, adsorption kinetic data of NiO(111) followed a pseudo-second-order rate for congo red. These studies infer that NiO(111) nanosheets possess desirable properties for application in adsorption and combustion applications.

Zhi Song; Lifang Chen; Juncheng Hu; Ryan Richards

2009-01-01T23:59:59.000Z

342

Silicon's role in determining swelling in neutron-irradiated Fe-Cr-Ni-Si alloys  

SciTech Connect (OSTI)

Two silicon-modified alloy series, one based on Fe-15Cr-20Ni and another based on Fe-15Cr-25Ni were irradiated at target temperatures between 399 and 649{degree}C in EBR-II. The influence of silicon on swelling is more complex than previously envisioned and indicates that silicon plays two or more competing roles while in solution. Radiation-induced formation of {gamma}{prime} (Ni{sub 3}Si) precipitates is dependent on silicon and nickel content, as well as temperature. Precipitation of {gamma}{prime} appears to play only a minor role in void formation.

Sekimura, N. (Tokyo Univ., Tokai, Ibaraki (Japan)); Garner, F. A. (Pacific Northwest Lab., Richland, WA (United States)); Newkirk, J.W. (Missouri Univ., Rolla, MO (United States))

1991-11-01T23:59:59.000Z

343

Gamma-strength functions in 60Ni from two-step cascades following proton capture  

E-Print Network [OSTI]

The two-step cascade method previously used in neutron capture experiments is now applied to a proton capture reaction. The spectrum of two-step cascades populating the first 2+ level of 60Ni has been measured with 59Co(p,2gamma)60Ni reaction. The simulation technique used for the spectrum analysis allows one to reveal the range of possible shapes of both E1 and M1 gamma-strength functions. The low-energy enhancement previously observed in 3He induced reactions is seen to appear in M1 strength functions of 60Ni.

A. Voinov; S. M. Grimes; C. R. Brune; M. Guttormsen; A. C. Larsen; T. N. Massey; A. Schiller; S. Siem

2009-11-10T23:59:59.000Z

344

Significant Reduction in NiO Band Gap upon Formation of LixNi1?xO Alloys: Applications to Solar Energy Conversion  

SciTech Connect (OSTI)

Long-term sustainable solar energy conversion relies on identifying economical and versatile semiconductor materials with appropriate band structures for photovoltaic and photocatalytic applications (e.g., band gaps of ?1.52.0 eV). Nickel oxide (NiO) is an inexpensive yet highly promising candidate. Its charge-transfer character may lead to longer carrier lifetimes needed for higher efficiencies, and its conduction band edge is suitable for driving hydrogen evolution via water-splitting. However, NiOs large band gap (?4 eV) severely limits its use in practical applications. Our first-principles quantum mechanics calculations show band gaps dramatically decrease to ?2.0 eV when NiO is alloyed with Li2O. We show that LixNi1?xO alloys (with x=0.125 and 0.25) are p-type semiconductors, contain states with no impurity levels in the gap and maintain NiOs desirable charge-transfer character. Lastly, we show that the alloys have potential for photoelectrochemical applications, with band edges well-placed for photocatalytic hydrogen production and CO2 reduction, as well as in tandem dye-sensitized solar cells as a photocathode.

Alidoust, Nima; Toroker, Maytal; Keith, John A.; Carter, Emily A.

2014-01-01T23:59:59.000Z

345

Extraction behavior of uranium(VI), plutonium(IV), zirconium(IV), ruthenium(III) and europium(III) with ?-pre-irradiated solutions of N,N?-methylbutyl substituted amides in n-dodecane  

Science Journals Connector (OSTI)

The extraction of plutonium(IV), uranium(VI), zirconium(IV), europium(III) and ruthenium(III) with ?-pre-irradiated n-dodecane solutions of methylbutyl substituted hexanamide (MBHA), octanamide (MBOA) and deca...

P. B. Ruikar; M. S. Nagar; M. S. Subramanian

1995-09-15T23:59:59.000Z

346

Precipitation behavior of Ni-Cr-22 Fe-18 Mo (Hastelloy-X) and Ni-Cr-22 Co-12 Mo (Inconel-617) after isothermal aging  

SciTech Connect (OSTI)

The precipitation behavior of the nickel-base alloys Ni-Cr-22Fe-18Mo (Hastelloy-X) and Ni-Cr-22Co12Mo (Inconel-617) has been investigated as a function of aging temperature. Hastelloy-X shows that M/sub 6/C and TiN are primary precipitates and M/sub 12/C, A/sub 3/B/sub 2/ (approx. = Fe/sub 3/Mo/sub 2/), and M/sub 23/C/sub 6/ are secondary precipitates, while Inconel-617 also has M/sub 6/C and TiN as primary precipitates and M/sub 23/C/sub 6/, M/sub 12/C, and Ni/sub 3/AlTi as secondary precipitates. The characterization has been carried out by metallographic and transmission electron microscopy investigations and by x-ray examinations of electrochemical isolated precipitates.

Kirchhofer, H.; Nickel, H.; Schubert, F.

1984-07-01T23:59:59.000Z

347

Evaluation of Zr(Ni, Mn){sub 2} Laves phase alloys as negative active material for Ni-MH electric vehicle batteries  

SciTech Connect (OSTI)

Laves phase alloys of compositions (Zr, Ti)(Ni, Mn, M){sub x} where M = Cr, V, Co, Al, and 1.9 < x < 2.1 with hexagonal C14 or cubic C15 structure have been studied in order to select the most suitable AB{sub 2} alloys as an active material for nickel-metal hydride (Ni-MH) batteries. With the selected alloy, feasibility of MH negative electrodes using industrial technology and containing more than 97% of the alloy powder has been demonstrated. 22 Ah Ni-MH batteries for electric vehicle application have been assembled, and 600 cycles have been achieved at steady C/3 charge and discharge rates and 80% depth of discharge.

Knosp, B. [Alcatel Alsthom Recherche, Marcoussis (France); Jordy, C.; Blanchard, P. [SAFT Research Dept., Marcoussis (France); Berlureau, T. [SAFT Advanced and Industrial Battery Div., Bordeaux (France)

1998-05-01T23:59:59.000Z

348

Methane Steam Reforming Kinetics on a Ni/Mg/K/Al2O3 Catalyst  

Science Journals Connector (OSTI)

The kinetics of methane steam reforming were studied on a Ni/Mg/K/...2O3...catalyst that was developed for conditioning of biomass-derived syngas. Reactions were conducted in a packed-bed reactor while the concen...

Allison M. Robinson; Megan E. Gin; Matthew M. Yung

2013-12-01T23:59:59.000Z

349

Fabrication and characterization of porous NiTi Shape Memory Alloy by elevated pressure sintering  

E-Print Network [OSTI]

have not been adequately developed. Currently, three methods are commonly used for producing porous NiTi SMAs from elemental powders. These methods include conventional sintering, Self-propagating High-temperature Synthesis (SHS), and sintering...

Vandygriff, Eric Layton

2012-06-07T23:59:59.000Z

350

Thermomechanical Cyclic Response of TiNiPd High-Temperature Shape Memory Alloys  

E-Print Network [OSTI]

TiNiPd high-temperature shape memory alloys (HTSMAs) have attracted considerable attention as potential solid-state actuators capable of operating at temperatures up to 500 C, exhibiting excellent corrosion resistance, adequate ductility levels...

Atli, Kadri

2012-10-19T23:59:59.000Z

351

Computational Thermodynamics of CoNiGa High Temperature Shape Memory Alloys  

E-Print Network [OSTI]

Shape Memory Alloys (SMAs) are advanced materials with interesting properties such as pseudoelasticity (PE) and the shape memory effect (SME). Recently, the CoNiGa system has emerged as the basis for very promising High Temperature Shape Memory...

Chari, Arpita

2012-10-19T23:59:59.000Z

352

Microstructure and Strengthening Mechanisms of Highly Textured Cu/Ni Multilayers  

E-Print Network [OSTI]

In this thesis, I planned to fabricate Cu/Ni metallic multilayers with equal layer thicknesses on different substrates by using magnetic sputtering technique. My objective was to characterize the texture, structure and hardness, in order to study...

Liu, Yue

2011-10-21T23:59:59.000Z

353

Roughening of the interface between grains and liquid matrix in sintered TaC-20Ni  

Science Journals Connector (OSTI)

The grains in TaC-20 wt pct Ni alloy prepared by liquidphase sintering at 1480C have orthorhombic shapes with flat {100} faces and sharp edges. These grains show abnormal growth. When sintered at 2020C, the gra...

Young Kyu Cho; Duk Yong Yoon; Jung Hoon Choi

2005-09-01T23:59:59.000Z

354

Thermodynamic modeling and experimental validation of the Fe-Al-Ni-Cr-Mo alloy system  

SciTech Connect (OSTI)

NiAl-type precipitate-strengthened ferritic steels have been known as potential materials for the steam turbine applications. In this study, thermodynamic descriptions of the B2-NiAl type nano-scaled precipitates and body-centered-cubic (BCC) Fe matrix phase for four alloys based on the Fe-Al-Ni-Cr-Mo system were developed as a function of the alloy composition at the aging temperature. The calculated phase structure, composition, and volume fraction were validated by the experimental investigations using synchrotron X-ray diffraction and atom probe tomography. With the ability to accurately predict the key microstructural features related to the mechanical properties in a given alloy system, the established thermodynamic model in the current study may significantly accelerate the alloy design process of the NiAl-strengthened ferritic steels.

Teng, Zhenke [ORNL; Zhang, F [CompuTherm LLC, Madison, WI; Miller, Michael K [ORNL; Liu, Chain T [Hong Kong Polytechnic University; Huang, Shenyan [ORNL; Chou, Y.T. [Multi-Phase Services Inc., Knoxville; Tien, R [Multi-Phase Services Inc., Knoxville; Chang, Y A [ORNL; Liaw, Peter K [University of Tennessee, Knoxville (UTK)

2012-01-01T23:59:59.000Z

355

Graphene-on-Insulator Transistors Made Using C on Ni Chemical-Vapor Deposition  

E-Print Network [OSTI]

Graphene transistors are made by transferring a thin graphene film grown on Ni onto an insulating SiO[subscript 2] substrate. The properties and integration of these graphene-on-insulator transistors are presented and ...

Keast, Craig L.

356

Modeling of Chemical Looping Combustion of Methane Using a Ni-Based Oxygen Carrier  

Science Journals Connector (OSTI)

Modeling of Chemical Looping Combustion of Methane Using a Ni-Based Oxygen Carrier ... The FR and loop seal are both bubbling fluidized beds. ... Industrial & Engineering Chemistry Research (2010), 49 (21), 10200-10211 CODEN: IECRED; ISSN:0888-5885. ...

Ahmed Bougamra; Lu Huilin

2014-03-31T23:59:59.000Z

357

E-Print Network 3.0 - alloyed mg50 ni50 Sample Search Results  

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

Ti29.2Ni50.8Hf20 ... Source: Zheng, Yufeng - Department of Advanced Materials and Nanotechnology, Peking University Collection: Materials Science ; Biology and Medicine 2 J. PHYS....

358

Metallographic study of gamma - gamma prime structure in the Ni-based superalloy GTD111  

E-Print Network [OSTI]

The potential for land-based turbine buckets material rejuvenation presents a significant commercial and scientific interest. Ni-based superalloy GTD111 is used at a number of GE-manufactured power generation turbines. The ...

Kountras, Apostolos, 1970-

2004-01-01T23:59:59.000Z

359

Reaction of CO/CO2 gas mixtures on NiYSZ cermet electrodes  

Science Journals Connector (OSTI)

The reaction of carbon monoxide/carbon dioxide mixtures on NiYSZ cermet electrodes was investigated as a function of the electrode potential and the partial pressures of the reactants at 1273 K. Time-dependen...

P. Holtappels; L. G. J. De Haart; U. Stimming

1999-05-01T23:59:59.000Z

360

E-Print Network 3.0 - ataeru eikyo ni Sample Search Results  

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

fully-periodic simulation cell. Fig... . The Ni atoms were slowly assembling to form metal clusters and were trying to find the most stable... Author: Yasushi Shibuta e-mail:...

Note: This page contains sample records for the topic "vi rgi ni" 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

Structural changes during the reaction of Ni thin films with (100) silicon substrates  

E-Print Network [OSTI]

thin transition metal silicide ?lms due to their ability tothe metal ?lm and the Ni concentration at the oxide/silicidemetal can di?use to the SiO 2 /Si interface and from silicide

Thron, Andrew M.; Greene, Peter K.; Liu, Kai; van Benthem, Klaus

2012-01-01T23:59:59.000Z

362

E-Print Network 3.0 - aisorui ni taisuru Sample Search Results  

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

fully-periodic simulation cell. Fig... . The Ni atoms were slowly assembling to form metal clusters and were trying to find the most stable... Author: Yasushi Shibuta e-mail:...

363

E-Print Network 3.0 - atsumitsu katei ni Sample Search Results  

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

fully-periodic simulation cell. Fig... . The Ni atoms were slowly assembling to form metal clusters and were trying to find the most stable... Author: Yasushi Shibuta e-mail:...

364

E-Print Network 3.0 - amorphous ni-ti alloys Sample Search Results  

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

044103 (6pp) doi:10.10881748-604134044103 Summary: .10881748-604134044103 Ti-TiC-TiCDLC gradient nano-composite film on a biomedical NiTi alloy Yufeng Zheng1,2, Dong...

365

Understanding and development of combined acoustic and magnetic actuation of Ni?MnGa single crystals  

E-Print Network [OSTI]

Ni-Mn-Ga based ferromagnetic shape memory alloys (FSMAs) have emerged as a promising new class of active materials capable of producing a large (several %) magnetic-field-induced strain (MFIS). FSMAs still have several ...

Techapiesancharoenkij, Ratchatee, 1979-

2007-01-01T23:59:59.000Z

366

Frequency Response of Acoustic-Assisted NiMnGa Ferromagnetic- Shape-Memory-Alloy Actuator  

E-Print Network [OSTI]

A prototype of NiMnGa based ferromagnetic-shape-memory-alloy (FSMA) actuator was designed and built; an acoustic-assist technique was applied to the actuator to enhance its performance. A piezoelectric stack actuator was ...

Techapiesancharoenkij, Ratchatee

367

Preliminary observations of the thermodynamic predictions of Fe-Cr-Ni alloys in coal gasifier environments  

Science Journals Connector (OSTI)

The construction of thermodynamic stability diagrams for the Fe-Cr-Ni systems is discussed. The constructed diagrams are used to predict materials behavior at coal gasifier oxygen and sulfur pote...

B. A. Gordon; V. Nagarajan

1979-04-01T23:59:59.000Z

368

Cr17Ni14Mo3 Powder Laser Cladding on 45Steel Substrate  

Science Journals Connector (OSTI)

The relationship between laser power, scan-rate, thickness of pre-placed powder particles, overlap, preheating and laser cladding coating quality was analyzed. Laser cladding of Cr17Ni14Mo3 stainless steel powder...

Sun Huilai; Lin Shuzhong; Zhao Fangfang; Qi Xiangyang

2010-01-01T23:59:59.000Z

369

Magnetism of NiMn2O4-Fe3O4 spinel interfaces  

E-Print Network [OSTI]

Magnetism of NiMn 2 O 4 Fe 3 O 4 spinel interfaces B. B.2. Element-specific magnetism of Fe 3 O 4 /NMO interface inin these structures, 6 the magnetism near the isostructural

Nelson-Cheeseman, B. B.

2007-01-01T23:59:59.000Z

370

Hydrogen storage of multiwalled carbon nanotubes coated with Pd-Ni nanoparticles under moderate conditions  

Science Journals Connector (OSTI)

A type of novel material with a high hydrogen storage capacity was prepared by supporting PdNi18 alloy nanoparticles, which were synthesized by using a new colloid method, on the surface of pretreated multiwalled...

Jianwei Ren; Shijun Liao; Junmin Liu

2006-12-01T23:59:59.000Z

371

High-Stable Mesoporous Ni-Ce/Clay Catalysts for Syngas Production  

Science Journals Connector (OSTI)

Delaminated-clay was synthesized from a natural smectite using polyvinyl alcohol and microwaves. Ni-Ce catalysts supported on delaminated clay achieved high stability in dry reforming of methane for syngas production

Carlos Enrique Daza; Oscar A. Gamba; Yesid Hernndez

2011-07-01T23:59:59.000Z

372

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect (OSTI)

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system have been explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering (LSMS) method to explore the magnetic states responsible for the magnet-caloric effect in this material. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy were investigated using differential scanning calorimetry (DSC) and superconducting quantum interference device (SQUID). Neutron scattering experiments were performed to observe the structural and magnetic phase transformations at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) on alloys of Ni-Mn-Ga and Ni-Mn-Ga-Cu-Fe. Data from the observations are discussed in comparison with the computational studies.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Sefat, A. S. [Oak Ridge National Laboratory (ORNL); Rusanu, Aurelian [ORNL; Evans III, Boyd Mccutchen [ORNL

2012-01-01T23:59:59.000Z

373

Absence of long-range chemical ordering in equimolar FeCoCrNi  

SciTech Connect (OSTI)

Equimolar FeCoCrNi alloys have been the topic of recent research as 'high-entropy alloys,' where the name is derived from the high configurational entropy of mixing for a random solid solution. Despite their name, no systematic study of ordering in this alloy system has been performed to date. Here, we present results from anomalous x-ray scattering and neutron scattering on quenched and annealed samples. An alloy of FeNi{sub 3} was prepared in the same manner to act as a control. Evidence of long-range chemical ordering is clearly observed in the annealed FeNi{sub 3} sample from both experimental techniques. The FeCoCrNi sample given the same heat treatment lacks long-range chemical order.

Lucas, M. S. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); UTC Inc., 1270 North Fairfield Road, Dayton, Ohio 45432 (United States); Wilks, G. B.; Senkov, O. N. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); UES, Inc., 4401 Dayton-Xenia Rd., Dayton, Ohio 45432 (United States); Mauger, L.; Munoz, J. A. [California Institute of Technology, W. M. Keck Laboratory 138-78, Pasadena, California 91125 (United States); Michel, E. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); Wright State University, Dayton, Ohio 45435 (United States); Horwath, J.; Semiatin, S. L. [Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States); Stone, M. B.; Abernathy, D. L. [Oak Ridge National Laboratory, 1, Bethel Valley Road, Oak Ridge, Tennessee 37831 (United States); Karapetrova, E. [Argonne National Laboratory, Argonne, Illinois 60439 (United States)

2012-06-18T23:59:59.000Z

374

Absence of long-range chemical ordering in equimolar FeCoCrNi  

SciTech Connect (OSTI)

Equimolar FeCoCrNi alloys have been the topic of recent research as high-entropy alloys, where the name is derived from the high configurational entropy of mixing for a random solid solution. Despite their name, no systematic study of ordering in this alloy system has been performed to date. Here we present results from anomalous x-ray scattering and neutron scattering on quenched and annealed samples. An alloy of FeNi3 was prepared in the same manner to act as a control. Evidence of longrange chemical ordering is clearly observed in the annealed FeNi3 sample from both experimental techniques. The FeCoCrNi sample given the same heat treatment lacks long-range chemical order.

Lucas, Matthew [Air Force Research Laboratory, Wright-Patterson AFB, OH; Wilks, G B [Air Force Research Laboratory, Wright-Patterson AFB, OH; Mauger, L [W. M. Keck Laboratory, Pasadena, CA; Munoz, Jorge A. [California Institute of Technology, Pasadena; Senkov, Oleg [ORNL; Michel, E [Air Force Research Laboratory, Wright-Patterson AFB, OH; Horwath, J [Air Force Research Laboratory, Wright-Patterson AFB, OH; Semiatin, S L [Air Force Research Laboratory, Wright-Patterson AFB, OH; Stone, Matthew B [ORNL; Abernathy, Douglas L [ORNL; Karapetrova, Evgenia [University of Illinois, Urbana-Champaign

2012-01-01T23:59:59.000Z

375

Scattering length density profile of Ni film under controlled corrosion: A study in neutron reflectometry  

Science Journals Connector (OSTI)

We report the density depth profile of an as-deposited Ni film and density profile for the same film after controlled electrochemical corrosion by chloride ions, measured by unpolarized neutron reflectometry. The...

Surendra Singh; A. K. Poswal; S. K. Ghosh; Saibal Basu

2008-11-01T23:59:59.000Z

376

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

377

Accumulation of Amorphous Cr(III)Te(IV) Nanoparticles on the Surface of Shewanella oneidensis MR-1 through Reduction of Cr(VI)  

Science Journals Connector (OSTI)

Industrial effluents constitute a major source of metal pollution of aquatic bodies. ... Before the XAFS measurement, all samples were maintained in argon (Ar) atmosphere in order to remove any air-borne contamination leading to sample oxidation. ... (-500 mV vs. Ag/AgCl) showed that a mediatorless MR-1 biocathode started up under aerated conditions in the presence of lactate, received 5.5 and 1.7 times more electrons for Cr(VI) redn. ...

Dong-Hun Kim; Sunhwa Park; Min-Gyu Kim; Hor-Gil Hur

2014-11-13T23:59:59.000Z

378

Ppn. SoL Snow Deplh Observer Vis. Vi;,. Vis. 00 in. 0 in. S5 J5 mi. mi. \\7 mi.  

E-Print Network [OSTI]

. Vi;,. Vis. 00 in. 0 in. S5 J5 mi. mi. \\7 mi. #12;..,- . M I~ · , \\f: ':'0 ll)A.\\I~S· Jb/ Ii I i. $".7~in. 0700 1300 1900 R.H. 24 hr. Mov. Clds. Clds. Clds.Sea L. - ! 0lU/l() .:. flOS-~ '/c. - mi. 30. Vis.Ppn. Sol. Snow Depth Observer a ~Sin. mi. J5 1111. mi.Q.O in. \\/ \\7_____~_____._._!O

Thompson, Anne

379

CIMAT, VI Escuela de verano, 25 de julio 7 de agosto 1999 Introducci'on a la Geometr'ia de la Mec'anica Cl'asica  

E-Print Network [OSTI]

parametrizada por (x(t); ?? x(t)): (d) Dibujar las gr'aficas de su energ'ia cin'etica T = ( ?? x) 2 =2 y potencial­ vaci'on de energ'ia, E = T + V = constante: (e) Repetir los 4 incisos anteriores con x(1) = 2; ?? x(0CIMAT, VI Escuela de verano, 25 de julio ­ 7 de agosto 1999 Introducci'on a la Geometr'ia de la Mec

Bor, Gil

380

CIMAT, VI Escuela de verano, 25 de julio -7 de agosto 1999 Introducci'on a la Geometr'ia de la Mec'anica Cl'asica  

E-Print Network [OSTI]

(t), `x(t)). (d)Dibujar las gr'aficas de su energ'ia cin'etica T = (x`)2=2 y potencial* * V = x2- vaci'on de energ'ia, E = T + V = constante. (e)Repetir los 4 incisos anteriores con x(1) = 2, `x CIMAT, VI Escuela de verano, 25 de julio - 7 de agosto 1999 Introducci'on a la Geometr'ia de la

Bor, Gil

Note: This page contains sample records for the topic "vi rgi ni" 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.


381

PVD synthesis and high-throughput property characterization of Ni?Fe?Cr alloy libraries  

SciTech Connect (OSTI)

Three methods of alloy library synthesis, thick-layer deposition followed by interdiffusion, composition-spread codeposition and electron-beam melting of thick deposited layers, have been applied to Ni-Fe-Cr ternary and Ni-Cr binary alloys. Structural XRD mapping and mechanical characterization by means of nanoindentation have been used to characterize the properties of the libraries. The library synthesis methods are compared from the point of view of the structural and mechanical information they can provide.

Rar, A.; Frafjord, J.J.; Fowlkes, Jason D.; Specht, E.D.; Rack, P.D.; Santella, M.L.; Bei, H.; George, E.P.; Pharr, G.M. (Tennessee-K); (Tennessee-K); (ORNL)

2010-11-10T23:59:59.000Z

382

Giant Ising-Type Magnetic Anisotropy in Trigonal Bipyramidal Ni(II) Complexes: Experiment and Theory  

Science Journals Connector (OSTI)

Giant Ising-Type Magnetic Anisotropy in Trigonal Bipyramidal Ni(II) Complexes: Experiment and Theory ... In the recent past, several Ni(II) mononuclear complexes presenting a large Ising-type magnetic anisotropy have been proposed. ... In order to rationalize the magnetic behavior and to get insight into the origin of the large Ising-type magnetic anisotropy experimentally observed, a full theoretical study was carried out. ...

Renaud Ruamps; Rmi Maurice; Luke Batchelor; Martial Boggio-Pasqua; Rgis Guillot; Anne Laure Barra; Junjie Liu; El-Eulmi Bendeif; Sbastien Pillet; Stephen Hill; Talal Mallah; Nathalie Guihry

2013-01-24T23:59:59.000Z

383

Mechanism for Oxygen Reduction Reaction on Pt3Ni Alloy Fuel Cell Boris V. Merinov,*,  

E-Print Network [OSTI]

, at the cathode of a polymer electrolyte membrane fuel cell (PEMFC) is a critical issue for commercial applicationMechanism for Oxygen Reduction Reaction on Pt3Ni Alloy Fuel Cell Cathode Yao Sha, Ted H. Yu, Boris of this type of fuel cells.1-4 The best current catalysts are Pt and Pt-based binary alloys, such as Pt3Ni.5

Goddard III, William A.

384

Heat treatment of NiCrFe alloy to optimize resistance to intergrannular stress corrosion  

DOE Patents [OSTI]

A process of producing a NiCrFe alloy having a high resistance to stress corrosion cracking comprising heating a NiCrFe alloy to a temperature sufficient to enable the carbon present in the alloy body in the form of carbide deposits to enter into solution, rapidly cool the alloy body, and heat the cooled body to a temperature between 1100.degree. to 1500.degree. F. for about 1 to 30 hours.

Steeves, Arthur F. (Schenectady, NY); Bibb, Albert E. (Clifton Park, NY)

1984-01-01T23:59:59.000Z

385

Kinetic Isotope Effects in the N2O Decomposition over NiO  

Science Journals Connector (OSTI)

Kinetic Isotope Effects in the N2O Decomposition over NiO ... The 15N and 18O kinetic isotope effects (KIEs) in the catalytic decomposition of nitrous oxide on NiO powder were determined in the temperature range of 625?825 K, and the following temperature dependencies were found:? KIE(15N) = (0.821 0.180) + (1445 128)/T and KIE(18O) = (1.384 ...

Peter emva; Antonija Lesar; Ivan Kobal; Marjan Senega?nik

2001-04-21T23:59:59.000Z

386

Microstructure and mechanical properties of diffusion bonded W/steel joint using V/Ni composite interlayer  

SciTech Connect (OSTI)

Diffusion bonding between W and steel using V/Ni composite interlayer was carried out in vacuum at 1050 C and 10 MPa for 1 h. The microstructural examination and mechanical property evaluation of the joints show that the bonding of W to steel was successful. No intermetallic compound was observed at the steel/Ni and V/W interfaces for the joints bonded. The electron probe microanalysis and X-ray diffraction analysis revealed that Ni{sub 3}V, Ni{sub 2}V, Ni{sub 2}V{sub 3} and NiV{sub 3} were formed at the Ni/V interface. The tensile strength of about 362 MPa was obtained for as-bonded W/steel joint and the failure occurred at W near the V/W interface. The nano-indentation test across the joining interfaces demonstrated the effect of solid solution strengthening and intermetallic compound formation in the diffusion zone. - Highlights: Diffusion bonding of W to steel was realized using V/Ni composite interlayer. The interfacial microstructure of the joint was clarified. Several VNi intermetallic compounds were formed in the interface region. The application of V/Ni composite interlayer improved the joining quality.

Liu, W.S.; Cai, Q.S., E-mail: cai2009pm@163.com; Ma, Y.Z.; Wang, Y.Y.; Liu, H.Y.; Li, D.X.

2013-12-15T23:59:59.000Z

387

Spin conversion of positronium in NiO/Al2O3 catalysts observed by coincidence Doppler broadening technique  

Science Journals Connector (OSTI)

High-purity NiO/Al2O3 catalysts were prepared by mixing NiO and ?-Al2O3 nanopowders. X-ray diffraction patterns were measured to characterize the grain size and crystalline phase of the nanopowders. Positron-annihilation spectroscopy was used to study the microstructure and surface properties of the pores inside the NiO/Al2O3 catalysts. The positron lifetime spectrum comprises two short and two long lifetime components. The two long lifetimes ?3 and ?4 correspond to ortho-positronium (o-Ps) annihilated in microvoids and large pores, respectively. With increasing NiO content in the NiO/Al2O3 catalysts, both ?4 and its intensity I4 show continuous decrease. Meanwhile, the para-positronium (p-Ps) intensity, obtained from coincidence Doppler broadening spectra, increases gradually with NiO content. The different variation in o-Ps and p-Ps intensity suggests the ortho-para conversion of positronium in NiO/Al2O3 catalysts. X-ray photoelectron spectroscopy shows that Ni mainly exists in the form of NiO. The electron-spin-resonance measurements reveal that the ortho-para conversion of Ps is induced by the unpaired electrons of the paramagnetic centers of NiO.

H. J. Zhang; Z. Q. Chen; S. J. Wang; A. Kawasuso; N. Morishita

2010-07-28T23:59:59.000Z

388

Fe(III) Reduction and U(VI) Immobilization by Paenibacillus sp. Strain 300A, Isolated from Hanford 300A Subsurface Sediments  

SciTech Connect (OSTI)

A facultative iron-reducing (Fe(III)-reducing) Paenibacillus sp. strain was isolated from Hanford 300A subsurface sediment biofilms that was capable of reducing soluble Fe(III) complexes (Fe(III)-NTA and Fe(III)-citrate) but unable to reduce poorly crystalline ferrihydrite (Fh). However, Paenibacillus sp. 300A was capable of reducing Fh in the presence of low concentrations (2 M) of either of electron transfer mediators (ETMs) flavin mononucleotide (FMN) or anthraquinone-2,6-disulfonate (AQDS). Maximum initial Fh reduction rates were observed at catalytic concentrations (<10 M) of either FMN or AQDS. Higher FMN concentrations inhibited Fh reduction, while increased AQDS concentrations did not. We found that Paenibacillus sp. 300A also could reduce Fh in the presence of natural ETMs from Hanford 300A subsurface sediments. In the absence of ETMs, Paenibacillus sp. 300A was capable of immobilizing U(VI) through both reduction and adsorption. The relative contributions of adsorption and microbial reduction to U(VI) removal from the aqueous phase were ~7:3 in PIPES and ~1:4 in bicarbonate buffer. Our study demonstrated that Paenibacillus sp. 300A catalyzes Fe(III) reduction and U(VI) immobilization and that these reactions benefit from externally added or naturally existing ETMs in 300A subsurface sediments.

Ahmed, B.; Cao, B.; McLean, Jeffrey S.; Ica, Tuba; Dohnalkova, Alice; Istanbullu, Ozlem; Paksoy, Akin; Fredrickson, Jim K.; Beyenal, Haluk

2012-11-07T23:59:59.000Z

389

Mixed valence and spin fluctuations in Ce(Ni, Co)/sub 2/ and related systems  

SciTech Connect (OSTI)

The pseudobinary alloys Ce(Ni/sub x/Co/sub 1-x/)/sub 2/, (Ce/sub x/La/sub 1-x/)Ni/sub 2/ and (Ce/sub x/Y/sub 1-x/)Ni/sub 2/, where 0 < x < 1, were studied. The room-temperature lattice constant, the magnetic susceptibility in the 6 to 300 K temperature range, the low-temperature specific heat in the 0.4 to 25 K range, and the electrical resistivity in the 0.4 to 300 K range were measured. Additionally, x-ray absorption around the L/sub 3/ edge was studied using the synchroton radiation. Both thermodynamic and L/sub 3/ probes yield similar results for the changes of valence of Ce across these systems. It was established that Ce is in the saturated valence state in the Ce(Ni/sub x/Co/sub 1-x/)/sub 2/ for x < 0.25. The valence decreases with x in the 0.25 to 1 concentration range. Similarly, the valence of Ce decreases in the (Ce, Y)Ni/sub 2/ systems upon substitution of Y for Ce. The results obtained for the (Ce/sub x/La/sub 1-x/)Ni/sub 2/ system are interpreted in terms of changes of the Ce/sup 3 +/ impurity levels. Spin fluctuations due to the 3d electrons play an important role in these systems

Andraka, B.

1986-01-01T23:59:59.000Z

390

EFFECT OF FUEL IMPURITY ON STRUCTURAL INTEGRITY OF Ni-YSZ ANODE OF SOFCs  

SciTech Connect (OSTI)

Electricity production through the integration of coal gasification with solid oxide fuel cells (SOFCs) may potentially be an efficient technique for clean energy generation. However, multiple minor and trace components are naturally present in coals. These impurities in coal gas not only degrade the electrochemical performance of Ni-YSZ anode used in SOFCs, but also severely endanger the structural integrity of the Ni-YSZ anode. In this paper, effect of the trace impurity of the coal syngases on the mechanical degradation of Ni-YSZ anode was studied by using an integrated experimental/modeling approach. Phosphorus is taken as an example of impurity. Anode-support button cell was used to experimentally explore the migration of phosphorous impurity in the Ni-YSZ anode of SOFCs. X-ray mapping was used to show elemental distributions and new phase formation. The subsequent finite element stress analyses were conducted using the actual microstructure of the anode to illustrate the degradation mechanism. It was found that volume expansion induced by the Ni phase change produces high stress level such that local failure of the Ni-YSZ anode is possible under the operating conditions

Liu, Wenning N.; Sun, Xin; Marina, Olga A.; Pederson, Larry R.; Khaleel, Mohammad A.

2011-01-01T23:59:59.000Z

391

Metal-induced nanocrystalline structures in Ni-containing amorphous silicon thin films  

SciTech Connect (OSTI)

The mechanisms of silicon nanocrystal structure formation in amorphous Si films have been studied for a relative Ni impurity content varying between 0.1 and 10 at. %, i.e., from a Ni doping range to the Si-Ni alloy phase. The films, deposited by the cosputtering technique at 200 deg. C, were submitted to isochronal (15 min) annealing cycles up to 800 deg. C. Four different substrates were used to deposit the studied films: crystalline (c-) quartz, c-Si, c-Ge, and glass. Both the two orders of magnitude impurity concentration range variation and the very short annealing times were selected on purpose to investigate the first steps of the mechanism leading to the appearance of crystal seeds. The conclusions of this work are the following: (a) Ni impurity induces the low-temperature crystallization of amorphous silicon; (b) the NiSi{sub 2} silicide phase mediates, at the surface or in the bulk of the film, the crystallization process; and (c) the onset of crystallization and the crystalline fraction of the samples at each temperature depend not only on the Ni impurity concentration, but also on the nature of the substrate.

Ferri, F. A.; Zanatta, A. R.; Chambouleyron, I. [Instituto de Fisica de Sao Carlos-USP, Sao Carlos 13560-250, Sao Paulo (Brazil); Instituto de Fisica Gleb Wataghin-UNICAMP, Campinas 13083-970, Sao Paulo (Brazil)

2006-11-01T23:59:59.000Z

392

Molecule-substrate interaction channels of metal-phthalocyanines on graphene on Ni(111) surface  

SciTech Connect (OSTI)

Molecule-substrate interaction channels of metal-phthalocyanines (MPcs, including NiPc, CuPc, ZnPc, FePc, and CoPc) on graphene on Ni(111) were investigated by employing high-resolution electron energy loss spectroscopy (HREELS). Except the expected IR-active modes, some Raman-active modes were also observed in all of MPcs, which are considered in this study. From the origination of the Raman-active features, it was deduced that MPcs are coupled with the substrate mainly through their central metal atom. The Raman-active modes appear as symmetric peaks in the HREELS in the case of MPcs with Ni, Cu, and Zn, whereas they are asymmetric and appear as a Fano line shape in the case of MPcs with Fe and Co. This spectroscopic difference indicates that the molecule-substrate coupling is completely different in the two cases mentioned above. The molecule-substrate interaction strength is considerably weak and comparable with the {pi}-{pi} interaction between molecules in the case of MPcs with Ni, Cu, and Zn, whereas it is much stronger in the case of MPcs with Fe and Co. From the HREELS observations, it can be suggested that the whole molecule can be effectively decoupled from the underneath Ni(111) by inserting a single layer of graphene between them in the case of MPcs with Ni, Cu, and Zn, whereas only benzene rings can be completely decoupled in the case of MPcs with Fe and Co.

Dou Weidong; Huang Shuping; Zhang, R. Q.; Lee, C. S. [Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong (Hong Kong)

2011-03-07T23:59:59.000Z

393

Dielectric property of NiTiO{sub 3} doped substituted ortho-chloropolyaniline composites  

SciTech Connect (OSTI)

Ortho-chloropolyaniline (OCP)-NiTiO{sub 3} composites have been synthesized via in-situ polymerization of ortho-chloroaniline with various weight percentages of NiTiO{sub 3.} Fourier Transform Infrared spectroscopic studies of Ortho-chloropolyaniline and its composites indicated the formation of composites as a result of Vander Waal's interaction between OCP and NiTiO{sub 3} particles. Surface morphology of OCP and OCP-NiTiO{sub 3} composites were studied using Scanning Electron Microscope (SEM). The SEM micrographs indicated a modified morphology after the composite formation. Dielectric properties and electric modulus of OCP and OCP-NiTiO{sub 3} composites have been investigated in the frequency range of 50 Hz 5 MHz. It has been noticed that electrical resistance decreases with increase in weight percentage of NiTiO{sub 3} particles in polymer matrix as well as with applied frequency. The display of semicircular arcs in Cole-Cole plots indicates the formation of series resistor and capacitor in network causing a decrease in the relaxation time and as a result conductivity enhances in these composites. The facile and cost effective synthesis process and excellent dielectric and conductivity response of these materials makes them promising materials for practical applications.

Lakshmi, Mohana; Faisal, Muhammad [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India)] [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Roy, Aashish S. [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India)] [Department of Materials Science, Gulbarga University, Gulbarga-585106, Karnataka (India); Khasim, Syed, E-mail: syed.pes@gmail.com [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India) [Department of Physics, PES Institute of Technology, BSC, Bangalore- 560100 (India); Department of Physics, University of Tabuk-71491 (Saudi Arabia); Sajjan, K. C. [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India)] [Department of Physics, Veerashaiva College, Bellary - 583 104, Karnataka (India); Revanasiddappa, M. [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)] [Department of Chemistry, PES Institute of Technology, BSC, Bangalore - 560100 (India)

2013-11-15T23:59:59.000Z

394

Impact of uranyl-calcium-carbonato complexes on uranium(VI) adsorption to synthetic and natural sediments  

SciTech Connect (OSTI)

Adsorption on soil and sediment solids may decrease aqueous uranium concentrations and limit its propensity for migration in natural and contaminated settings. Uranium adsorption will be controlled in large part by its aqueous speciation, with a particular dependence on the presence of dissolved calcium and carbonate. Here we quantify the impact of uranyl speciation on adsorption to both goethite and sediments from the Hanford Clastic Dike and Oak Ridge Melton Branch Ridgetop formations. Hanford sediments were preconditioned with sodium acetate and acetic acid to remove carbonate grains, and Ca and carbonate were reintroduced at defined levels to provide a range of aqueous uranyl species. U(VI) adsorption is directly linked to UO{sub 2}{sup 2+} speciation, with the extent of retention decreasing with formation of ternary uranyl-calcium-carbonato species. Adsorption isotherms under the conditions studied are linear, and K{sub d} values decrease from 48 to 17 L kg{sup -1} for goethite, from 64 to 29 L kg{sup -1} for Hanford sediments, and from 95 to 51 L kg{sup -1} for Melton Branch sediments as the Ca concentration increases from 0 to 1 mM at pH 7. Our observations reveal that, in carbonate-bearing waters, neutral to slightly acidic pH values ({approx}5) and limited dissolved calcium are optimal for uranium adsorption.

Stewart, B.D. [Stanford University; Mayes, Melanie [ORNL; Fendorf, Scott [ORNL

2010-01-01T23:59:59.000Z

395

Electrochemical Testing of Ni-Cr-Mo-Gd Alloys  

SciTech Connect (OSTI)

The waste package site recommendation design specified a boron-containing stainless steel, Neutronit 976/978, for fabrication of the internal baskets that will be used as a corrosion-resistant neutron-absorbing material. Recent corrosion test results gave higher-than-expected corrosion rates for this material. The material callout for these components has been changed to a Ni-Cr-Mo-Gd alloy (ASTM-B 932-04, UNS N06464) that is being developed at the Idaho National Laboratory. This report discusses the results of initial corrosion testing of this material in simulated in-package environments that could contact the fuel baskets after breach of the waste package outer barrier. The corrosion test matrix was executed using the potentiodynamic and potentiostatic electrochemical test techniques. The alloy performance shows low rates of general corrosion after initial removal of a gadolinium-rich second phase that intersects the surface. The high halide-containing test solutions exhibited greater tendencies toward initiation of crevice corrosion.

T. E. Lister; R. E. Mizia; H. Tian

2005-10-01T23:59:59.000Z

396

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

397

Ag{sub 3}Ni{sub 2}O{sub 4}-A new stage-2 intercalation compound of 2H-AgNiO{sub 2} and physical properties of 2H-AgNiO{sub 2} above ambient temperature  

SciTech Connect (OSTI)

Ag{sub 3}Ni{sub 2}O{sub 4} was obtained as single crystals from a mixture of 2H-AgNiO{sub 2} and Ag{sub 2}O in oxygen high-pressure autoclaves (P6{sub 3}/mmc (no. 194), a=2.9331(6), c=28.313(9)A, Z=2). It may be regarded as a stage-2 intercalation compound of the host 2H-AgNiO{sub 2} and is the first staging compound constituted of alternating subvalent {approx}2Ag{sub 2}{sup +} and Ag{sup +} sheets, inserted between NiO{sub 2}{sup -} slabs. From a structural point of view, Ag{sub 3}Ni{sub 2}O{sub 4} represents an intermediate between AgNiO{sub 2} and the recently reported Ag{sub 2}NiO{sub 2}. The electronic structures of 2H-AgNiO{sub 2} and Ag{sub 3}Ni{sub 2}O{sub 4} have been investigated based on DFT band structure calculations. The high-temperature characteristics of the starting material 2H-AgNiO{sub 2} were investigated. The inverse magnetic susceptibility, electrical resistivity and differential scanning calorimetry (DSC) show a phase transition in the temperature range of T=320-365K.

Soergel, Timo [Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, 70569 Stuttgart (Germany); Jansen, Martin [Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, 70569 Stuttgart (Germany)], E-mail: m.jansen@fkf.mpg.de

2007-01-15T23:59:59.000Z

398

Influence of implantation induced Ni-doping on structural, optical, and morphological properties of nanocrystalline CdS thin films  

Science Journals Connector (OSTI)

Ni-doped CdS thin films were prepared by 90keV Ni+ implantation at room temperature. Ni-ion implantation induced modifications in structural, optical, and morphological properties are studied for a wide range of impurity concentrations (1.8610.19at.%). Addition of Ni+ ions does not lead to any structural phase transformation or formation of metallic clusters or secondary phase precipitates. However, it induces structural disorder leading to a reduction in the optical band gap from 2.39 to 2.28eV following Ni implantation up to 3נ1016 ions cm?2. This is addressed on the basis of band tailing due to the creation of localized energy states and implantation induced grain growth. Moreover, Ni-doping is found to modify the luminescence properties by creating shallow acceptor states.

S. Chandramohan; T. Strache; S.N. Sarangi; R. Sathyamoorthy; T. Som

2010-01-01T23:59:59.000Z

399

Epitaxial growth of CdTe thin film on cube-textured Ni by metal-organic chemical vapor deposition  

SciTech Connect (OSTI)

CdTe thin film has been grown by metalorganic chemical vapor deposition (MOCVD) on Ni(100) substrate. Using x-ray pole figure measurements we observed the epitaxial relationship of {111}CdTe// {001}Ni with [110]CdTe//[010]Ni and [112] CdTe//[100]Ni. The 12 diffraction peaks in the (111) pole figure of CdTe film and their relative positions with respect to the four peak positions in the (111) pole figure of Ni substrate are consistent with four equivalent orientational domains of CdTe with three to four superlattice match of about 0.7% in the [110] direction of CdTe and the [010] direction of Ni. The electron backscattered diffraction (EBSD) images show that the CdTe domains are 30 degrees orientated from each other.

GIARE, C [Rensselaer Polytechnic Institute (RPI); RAO, S [Rensselaer Polytechnic Institute (RPI); RILEY, M [Rensselaer Polytechnic Institute (RPI); CHEN, L [Rensselaer Polytechnic Institute (RPI); Goyal, Amit [ORNL; BHAT, I [Rensselaer Polytechnic Institute (RPI); LU, T [Rensselaer Polytechnic Institute (RPI); WANG, G [Rensselaer Polytechnic Institute (RPI)

2012-01-01T23:59:59.000Z

400

Extraction of actinide (III, IV, V, VI) ions and TcO4- byN,N,N',N'- tetraisobutyl-3-oxa-glutaramide  

SciTech Connect (OSTI)

The extraction behavior of U(VI), Np(V), Pu(IV), Am(III), and TcO{sub 4}{sup -} with N, N, N', N'-tetraisobutyl-3-oxa-glutaramide (TiBOGA) were investigated. An organic phase of 0.2 mol/L TiBOGA in 40/60% (V/V) 1-octanol/kerosene showed good extractability for actinides (III, IV, V VI) and TcO{sub 4}{sup -}from aqueous solutions of HNO{sub 3} (0.1 to 4 mol/L). At 25 C, the distribution ratio of the actinide ions (D{sub An}) generally increased as the concentration of HNO{sub 3} in the aqueous phase was increased from 0.1 to 4 mol/L, while the D{sub Tc} at first increased, then decreased, with a maximum of 3.0 at 2 mol/L HNO{sub 3}. Based on the slope analysis of the dependence of D{sub M} (M = An or Tc) on the concentrations of reagents, the formula of extracted complexes were assumed to be UO{sub 2}L{sub 2}(NO{sub 3}){sub 2}, NpO{sub 2}L{sub 2}(NO{sub 3}), PuL(NO{sub 3}){sub 4}, AmL{sub 3}(NO{sub 3}){sub 3}, and HL{sub 2}(TcO{sub 4}) where L = TiBOGA. The enthalpy and entropy of the corresponding extraction reactions, {Delta}{sub r}H and {Delta}{sub r}S, were calculated from the dependence of D on temperature in the range of 15-55 C. For U(VI), Np(V), Am(III) and TcO{sub 4}{sup -}, the extraction reactions are enthalpy driven and disfavored by entropy ({Delta}{sub r}H < 0 and {Delta}{sub r}S < 0). In contrast, the extraction reaction of Pu(IV) is entropy driven and disfavored by enthalpy ({Delta}{sub r}H > 0 and {Delta}{sub r}S > 0). A test run with 0.2 mol/L TiBOGA in 40/60% 1-octanol/kerosene was performed to separate actinides and TcO{sub 4}{sup -} from a simulated acidic high-level liquid waste (HLLW), using tracer amounts of {sup 238}U(VI), {sup 237}Np(V), {sup 239}Pu(VI), {sup 241}Am(III) and {sup 99}TcO{sub 4}{sup -}. The distribution ratios of U(VI), Np(V), Pu(VI), Am(III) and TcO{sub 4}{sup -} were 12.4, 3.9, 87, > 1000 and 1.5, respectively, confirming that TiBOGA is a promising extractant for the separation of all actinides and TcO{sub 4}{sup -} from acidic HLLW. It is noteworthy that the extractability of TiBOGA for Np(V) from acidic HLLW (D{sub Np(V)} = 3.9) is much higher than that of many other extractants that have been studies for the separation of actinides from HLLW.

Tian, Guoxin; Zhang, Ping; Wang, Jianchen; Rao, Linfeng

2005-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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
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401

Symmetry energy and the isoscaling properties of the fragments in multifragmentation of 40Ca+58Ni, 40Ar+58Ni, and 40Ar+58Fe reactions  

E-Print Network [OSTI]

The symmetry energy and the isoscaling properties of the fragments produced in multifragmentation of 40Ar, 40Ca + 58Fe, 58Ni reactions at 25, 33, 45 and 53 MeV/nucleon were investigated within the framework of a statistical multifragmentation model...

Iglio, Jennifer Ann

2007-09-17T23:59:59.000Z

402

2010 National Instruments. All rights reserved. Visit ni.com/legal. For patents see ni.com/patents. National Instruments LabVIEW Boot Camp at  

E-Print Network [OSTI]

.com/patents. National Instruments LabVIEW Boot Camp at Arizona State University June 16 - 19, 2014 8:00 AM - 5:00 PM Each day Memorial Union - Cochise & Union Stage Register today to attend our upcoming NI LabVIEW Boot

Reisslein, Martin

403

Local structure of amorphous \\{MO50Ni50\\} determined by anomalous x-ray scattering using synchroton radiation  

Science Journals Connector (OSTI)

Anomalous (resonance) x-ray scattering technique using synchrotron radiation was applied to determine the compositionally resolved local structure of sputter deposited amorphous Mo50Ni50. The local environments of Mo atoms and Ni atoms were found to be significantly different from each other, but similar to the corresponding local environments in crystalline MoNi. The results compare favorably with those of the EXAFS measurement.

S. Aur; D. Kofalt; Y. Waseda; T. Egami; R. Wang; H.S. Chen; Boon-Keng Teo

1983-01-01T23:59:59.000Z

404

Generation of a Doubly Bridging CO2 Ligand and Deoxygenation of CO2 by an (NHC)Ni(0) Complex  

E-Print Network [OSTI]

for CO2, µ-2,2-CO2, at a dinickel core. The reaction of [(IPr)Ni(µ-Cl)]2 18 (IPr ) 1,3-bis(2,6-diisopro, (IPr)- Ni(6-C6D6). We note that this symmetric pattern for the backbone protons is observed in reacted isolation of the product as a solid. Reaction of [(IPr)Ni(µ-Cl)]2 with Li(HBEt3) or with NaOt-Bu followed

Müller, Peter

405

Hydrogen Insertion Effects on the Electronic Structure of Equiatomic MgNi Traced by ab initio Calculations.  

E-Print Network [OSTI]

1 Hydrogen Insertion Effects on the Electronic Structure of Equiatomic MgNi Traced by ab initio-xxx / Received October 18, 2012. Doi: 10.5560/ ZNB.2012-xxx For equiatomic MgNi which can be hydrogenated up to the composition MgNiH1.6 at an absorption/desorption temperature of 200 °C, the effects of hydrogen are approached

Paris-Sud XI, Université de

406

On the development of high quality NiTi shape memory and pseudoelastic parts by additive manufacturing  

Science Journals Connector (OSTI)

Additive manufacturing provides an attractive processing method for nickel?titanium (NiTi) shape memory and pseudoelastic parts. In this paper, we show how the additive manufacturing process affects structural and functional properties of additively manufactured NiTi and how the process parameter set-up can be optimized to produce high quality NiTi parts and components. Comparisons of shape recovery due to shape memory and pseudoelasticity in additively manufactured and commercial NiTi exhibit promising potential for this innovative processing method.

Christoph Haberland; Mohammad Elahinia; Jason M Walker; Horst Meier; Jan Frenzel

2014-01-01T23:59:59.000Z

407

Construction of the Magnetic Phase Diagram of FeMn/Ni/Cu(001) Using Photoemission Electron Microscopy  

SciTech Connect (OSTI)

Single crystalline FeMn/Ni bilayer was epitaxially grown on Cu(001) substrate and investigated by photoemission electron microscopy (PEEM). The FeMn and Ni films were grown into two cross wedges to facilitate an independent control of the FeMn (0-20 ML) and Ni (0-20 ML) film thicknesses. The Ni magnetic phases were determined by Ni domain images as a function of the Ni thickness (d{sub Ni}) and the FeMn thickness (d{sub FeMn}). The result shows that as the Ni thickness increases, the Ni film undergoes a paramagnetic-to-ferromagnetic state transition at a critical thickness of d{sub FM} and an in-plane to out-of-plane spin reorientation transition at a thicker thickness d{sub SRT}. The phase diagram shows that both d{sub FM} and d{sub SRT} increase as the FeMn film establishes its antiferromagnetic order.

Wu, J.; Scholl, A.; Arenholz, E.; Hwang, C.; Qiu, Z. Q.

2011-01-04T23:59:59.000Z

408

Nyhetsbrev frn teckensprksavdelningen, v6 2013 Om ni inte hade mjlighet att vara med p symposiet "Perspektiv p dvas  

E-Print Network [OSTI]

1 (1) Nyhetsbrev från teckenspråksavdelningen, v6 2013 Om ni inte hade möjlighet att vara med på

409

Conceptual design of a Ni-based chemical looping combustion process using fixed-beds  

Science Journals Connector (OSTI)

Abstract This work presents a comprehensive conceptual design of a Ni-based chemical looping combustion process (CLC) carried out in fixed bed reactors. The process is intended to exploit the well-known advantages of the Ni/NiO redox system for CLC applications in terms of high reactivity, O2 carrying capacity and chemical and thermal stability. Solutions to the problem of heat management in fixed bed reactors at high temperature and high pressure are described, while a continuous flow of nitrogen for driving a gas turbine is produced. Each reactor involved in the process goes through a cyclic sequence of five reaction and heat transfer stages. Cool product gas recirculations are incorporated into the Ni oxidation and NiO reduction stages in order to moderate the maximum temperatures in the beds and control the displacement of the reaction and heat transfer fronts. A preliminary conceptual design of the process has been carried out to determine the minimum number of reactors needed for continuous operation in typical large-scale CO2 capture systems. Basic reactor models and assumptions based on an ideal plug flow pattern have been used in all the reactors during the chemical reactions and the heat transfer operations. This has made it possible to identify reasonable operating windows for the eight fixed-bed reactors that make up the CO2 capture system, and has demonstrated not only its technical viability but also its great potential for further development.

J.R. Fernndez; J.C. Abanades

2014-01-01T23:59:59.000Z

410

Spillover sites on a 19% Ni/Al sub 2 O sub 3 catalyst  

SciTech Connect (OSTI)

Two distinct methanation sites are clearly identified on a 19% Ni/Al{sub 2}O{sub 3} catalyst by temperature-programmed reaction (TPR) employing isotope labeling. The two sites, which are present after reduction at 975 K, are due to CO adsorption on Ni crystallites and CO and H spillover onto the Al{sub 2}O{sub 3} support. The concentration of sites on the support is 250 {mu}mol/G Al{sub 2}O{sub 3} (5 {times} 10{sup 13} molecules/cm{sup 2}), which is the same value measured for a 5.1% Ni/Al{sub 2}O{sub 3} catalyst and for a 1.0% Ru/Al{sub 2}O{sub 3} catalyst. Temperature-programmed desorption suggest that the CO and H on the Al{sub 2}O{sub 3} are in the form of a H-CO complex. The formation of this complex is an activated process, which is related to the activated adsorption of H{sub 2}. The H{sub 2} that adsorbs between 300 and 385 K is responsible for this spillover process onto the Al{sub 2}O{sub 3}. Isotope labeling and TPR were used to verify that a H-CO complex does not form on Ni/SiO{sub 2} catalysts. Carbon monoxide adsorption on Ni/SiO{sub 2} was not activated and only one methanation site was seen.

Sen, B.; Falconer, J.L. (Univ. of Colorado, Boulder (USA))

1989-06-01T23:59:59.000Z

411

Effect of Ni/Al atomic ratio of mesoporous NiAl2O3 aerogel catalysts on their catalytic activity for hydrogen production by steam reforming of liquefied natural gas (LNG)  

Science Journals Connector (OSTI)

Mesoporous NiAl2O3 (XNiAE) aerogel catalysts with different Ni/Al atomic ratio (X) were prepared by a single-step sol-gel method and a subsequent CO2 supercritical drying method. The effect of Ni/Al atomic ratio of mesoporous \\{XNiAE\\} aerogel catalysts on their physicochemical properties and catalytic activity for steam reforming of liquefied natural gas (LNG) was investigated. Textural properties and chemical properties of \\{XNiAE\\} catalysts were strongly influenced by Ni/Al atomic ratio. Nickel species were highly dispersed on the surface of \\{XNiAE\\} catalysts through the formation of surface nickel aluminate phase. In the steam reforming of LNG, both LNG conversion and hydrogen yield showed volcano-shaped curves with respect to Ni/Al atomic ratio. Average nickel diameter of \\{XNiAl\\} catalysts was well correlated with LNG conversion and hydrogen yield over the catalysts. Among the catalysts tested, 0.35NiAE (Ni/Al=0.35) catalyst with the smallest average nickel diameter showed the best catalytic performance. The highest surface area, the largest pore volume, the largest average pore size, and the highest reducibility of 0.35NiAE catalyst were also partly responsible for its superior catalytic performance.

Jeong Gil Seo; Min Hye Youn; Yongju Bang; In Kyu Song

2010-01-01T23:59:59.000Z

412

Catalytic performances of NiCaOmayenite in CO2 sorption enhanced steam methane reforming  

Science Journals Connector (OSTI)

Abstract NiCaOmayenite (Ca12Al14O33) catalysts for the CO2 Sorption Enhanced Steam Methane Reforming (SE-SMR) have been developed using the microwave assisted self-combustion method of preparation. The sorption of CO2 by CaO shifts the steam reforming and the Water Gas Shift reaction (WGS) towards H2 production and favors the heat balance of the global reaction. The CO2 sorption has been studied on materials with different CaO/Ca12Al14O33 ratios and for different types of preparation. The specific surface area of materials, the temperature of Ni phases' reducibility and CO2 sorption are all essential for material efficiency. The NiCA75MM catalyst was the most active and stable in methane steam reforming with CO2 sorption, even at an unusually low temperature (650C).

Moiss R. Cesrio; Bralio S. Barros; Claire Courson; Dulce M.A. Melo; Alain Kiennemann

2015-01-01T23:59:59.000Z

413

Electronic structure of BaNi2P2 observed by angle-resolved photoemission spectroscopy  

Science Journals Connector (OSTI)

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of BaNi2P2 that shows a superconducting transition at Tc ? 2.5 K. We observed hole and electron Fermi surfaces (FSs) around the Brillouin zone center and corner, respectively, and the shapes of the hole FSs dramatically changed with photon energy, indicating strong three dimensionality. The observed FSs are consistent with band-structure calculations and de Haas-van Alphen measurements. The mass enhancement factors estimated in the normal state were m*/mb ? 2, indicating weak electron correlation compared to typical iron-pnictide superconductors. An electronlike Fermi surface around the Z point was observed in contrast with BaNi2As2 and may be related to the higher Tc of BaNi2P2.

S. Ideta; T. Yoshida; M. Nakajima; W. Malaeb; H. Kito; H. Eisaki; A. Iyo; Y. Tomioka; T. Ito; K. Kihou; C. H. Lee; Y. Kotani; K. Ono; S. K. Mo; Z. Hussain; Z.-X. Shen; H. Harima; S. Uchida; A. Fujimori

2014-05-28T23:59:59.000Z

414

Field dependence of the superconducting basal plane anisotropy of TmNi2B2C  

SciTech Connect (OSTI)

The superconductor TmNi2B2C possesses a significant fourfold basal plane anisotropy, leading to a square vortex lattice (VL) at intermediate fields. However, unlike other members of the borocarbide superconductors, the anisotropy in TmNi2B2C appears to decrease with increasing field, evident by a reentrance of the square VL phase. We have used small-angle neutron scattering measurements of the VL to study the field dependence of the anisotropy. Our results provide a direct, quantitative measurement of the decreasing anisotropy. We attribute this reduction of the basal plane anisotropy to the strong Pauli paramagnetic effects observed in TmNi2B2C and the resulting expansion of vortex cores near Hc2.

Das, P.; Densmore, J.M.; Rastovski, C.; Schlesinger, K.J.; Laver, M.; Dewhurst, C.D.; Littrell, K.; Budko, Serguei L.; Canfield, Paul C.; Eskildsen, M.R.

2012-10-01T23:59:59.000Z

415

Interactions of oxygen and ethylenewith submonolayer Ag filmssupported on Ni(111)  

SciTech Connect (OSTI)

We investigate the oxidation of, and the reaction of ethylene with, Ni(111) with and without sub-monolayer Ag adlayers as a function of temperature. The addition of Ag to Ni(111) is shown to enhance the activity towards the ethylene epoxidation reaction, and increase the temperature at which ethylene oxide is stable on the surface. We present a systematic study of the formation of chemisorbed oxygen on the Ag Ni(111) surfaces and correlate the presence and absence of O1 and O2 surface species with the reactivity towards ethylene. By characterizing the samples with low-energy electron microscopy (LEEM) in combination with X-ray photoelectron spectroscopy (XPS), we have identified specific growth of silver on step-edge sites and successfully increased the temperature at which the produced ethylene oxide remains stable, a trait which is desirable for catalysis.

Rettew, Robert [Georgia Institute of Technology; Meyer, Axel [ORNL; Senanayake, Sanjaya D [ORNL; Chen, Tsung-Liang [ORNL; Petersburg, Cole [Georgia Institute of Technology; Flege, J. Ingo [University of Bremen, Bremen, Germany; Falta, Jens [University of Bremen, Bremen, Germany; Alamgir, Faisal [ORNL

2011-01-01T23:59:59.000Z

416

Interactions of Oxygen and Ethylene with Submonolayer Ag Films Supported on Ni(111)  

SciTech Connect (OSTI)

We investigate the oxidation of, and the reaction of ethylene with, Ni(111) with and without sub-monolayer Ag adlayers as a function of temperature. The addition of Ag to Ni(111) is shown to enhance the activity towards the ethylene epoxidation reaction, and increase the temperature at which ethylene oxide is stable on the surface. We present a systematic study of the formation of chemisorbed oxygen on the Ag-Ni(111) surfaces and correlate the presence and absence of O{sup 1-} and O{sup 2-} surface species with the reactivity towards ethylene. By characterizing the samples with low-energy electron microscopy (LEEM) in combination with X-ray photoelectron spectroscopy (XPS), we have identified specific growth of silver on step-edge sites and successfully increased the temperature at which the produced ethylene oxide remains stable, a trait which is desirable for catalysis.

Alamgir, F.M.; Senanayake, S.; Rettew, R.E.; Meyer, A.; Chen, T.-L.; Petersburg, C.; Flege, J.I.; Falta, J.

2011-06-01T23:59:59.000Z

417

Interactions of Oxygen and Ethylene with Submonolayer Ag Films Supported on Ni(111)  

SciTech Connect (OSTI)

We investigate the oxidation of, and the reaction of ethylene with, Ni(111) with and without sub-monolayer Ag adlayers as a function of temperature. The addition of Ag to Ni(111) is shown to enhance the activity towards the ethylene epoxidation reaction, and increase the temperature at which ethylene oxide is stable on the surface. We present a systematic study of the formation of chemisorbed oxygen on the Ag-Ni(111) surfaces and correlate the presence and absence of O{sup 1-} and O{sup 2-} surface species with the reactivity towards ethylene. By characterizing the samples with low-energy electron microscopy (LEEM) in combination with X-ray photoelectron spectroscopy (XPS), we have identified specific growth of silver on step-edge sites and successfully increased the temperature at which the produced ethylene oxide remains stable, a trait which is desirable for catalysis.

R Rettew; A Meyer; S Senanayake; T Chen; C Petersburg; J Flege; J Falta; F Alamgir

2011-12-31T23:59:59.000Z

418

Study of 3D Laser Cladding for Ni85Al15 Superalloy  

Science Journals Connector (OSTI)

Abstract Conditions of successful3D laser cladding for Ni based superalloy were studied. A high power Yb-YAG laser was used to create a molten pool on a stainless steel substrate into which Ni85Al15 powder stream was delivered to create 3D samples. The effect of different laser parameters on the structure and the intermetallic phase content of the manufactured samples were explored by optical metallography, microhardness, SEM, X-ray, and EDX analysis. The cladding of the Ni3A1 coating with small dilution into substrate can be obtained at the appropriate power density of about 2-8J/mm2 under the laser scan velocity of 100-200mm/min and the powder feed rate ? 3.8g/min.

D. Kotoban; S. Grigoriev; I. Shishkovsky

2014-01-01T23:59:59.000Z

419

Quantum confinement induced magnetism in LaNiO3-LaMnO3 superlattices  

SciTech Connect (OSTI)

The emergence of magnetic reconstructions at the interfaces of oxide heterostructures are often explained via subtle modifications in the electronic densities, exchange couplings, or strain. Here, an additional possible route for induced magnetism is studied in the context of the (LaNiO3)n/(LaMnO3)n superlattices using a hybrid tightbinding model. In the LaNiO3 region, the induced magnetizations decouple from the intensity of charge leakage from Mn to Ni, but originate from the spin-filtered quantum confinement present in these nanostructures. In general, the induced magnetization is the largest for the (111)-stacking and the weakest for the (001)-stacking superlattices; results compatible with the exchange bias effects reported byGibert et al. [Nat.Mater. 11, 195 (2012)].

Dong, Shuai [ORNL; Dagotto, Elbio R [ORNL

2013-01-01T23:59:59.000Z

420

Fabrication of Ni-shims using UV-moulding as an intermediate step  

Science Journals Connector (OSTI)

We fabricated nickel-shims including various types of structures with dimensions from hundreds of nanometers to several microns. The mastering process was made by electron-beam lithography, lift-off and reactive ion etching techniques. Then the structures were copied into a UV-curable ORMOCER-material and the Ni-shims were fabricated by electroforming using UV-copies as masters. The experiments showed that the use of UV-copying evades typical quartz master sticking and cracking problems. Furthermore, all features were replicated in the final Ni-shim as they existed in the quartz master proving the method suitable for the fabrication of the Ni-shims from the quartz masters with high precision.

Juha Pietarinen; Samuli Siitonen; Noora Tossavainen; Janne Laukkanen; Markku Kuittinen

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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.


421

Electrical properties of the amorphous interfacial layer between Al electrodes and epitaxial NiO films  

SciTech Connect (OSTI)

The amorphous interfacial layer (a-IL) between Al electrode and epitaxial NiO films were studied using electron energy-loss spectroscopy (EELS) and energy-dispersive x-ray spectroscopy. Two distinct properties were found in the a-IL, i.e., a lower metallic and an upper insulating layer. EELS results revealed that the metallic Ni atoms were responsible for the conducting nature of the lower oxide amorphous layer. The resistance behavior of Al/a-IL/epi-NiO was changed from a high to a low resistance state after forming process. The resistance change could be explained by the formation of a nanocrystalline metal alloy in the insulating amorphous layer.

Hyuck Jang, Jae; Kwon, Ji-Hwan; Kim, Miyoung [Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea, Republic of); Ran Lee, Seung; Char, Kookrin [Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747 (Korea, Republic of)

2012-04-23T23:59:59.000Z

422

[TiII] and [NiII] emission from the strontium filament of eta Carinae  

E-Print Network [OSTI]

We study the nature of the [TiII] and [NiII] emission from the so-called strontium filament found in the ejecta of eta Carinae. To this purpose we employ multilevel models of the TiII and NiII systems which are used to investigate the physical condition of the filament and the excitation mechanisms of the observed lines. For the TiII ion, for which no atomic data was previously available, we carry out ab initio calculations of radiative transition rates and electron impact excitation rate coefficients. It is found that the observed spectrum is consistent with the lines being excited in a mostly neutral region with an electron density of the order of $10^7$ cm$^{-3}$ and a temperature around 6000 K. In analyzing three observations with different slit orientations recorded between March~2000 and November~2001 we find line ratios that change among various observations, in a way consistent with changes of up to an order of magnitude in the strength of the continuum radiation field. These changes result from different samplings of the extended filament, due to the different slit orientations used for each observation, and yield clues on the spatial extent and optical depth of the filament. The observed emission indicates a large Ti/Ni abundance ratio relative to solar abundances. It is suggested that the observed high Ti/Ni ratio in gas is caused by dust-gas fractionation processes and does not reflect the absolute Ti/Ni ratio in the ejecta of \\etacar. We study the condensation chemistry of Ti, Ni and Fe within the filament and suggest that the observed gas phase overabundance of Ti

M. A. Bautista; H. Hartman; T. R. Gull; N. Smith; K. Lodders

2006-06-12T23:59:59.000Z

423

Nature of carbon in Ni/. cap alpha. -Al/sub 2/O/sub 3/ catalyst deactivated by the methane-steam reforming reaction  

SciTech Connect (OSTI)

The mechanism of carbon formation on Ni surfaces has been studied extensively because of its importance both for coke formation on the Ni alloy reactor walls in steam cracking (pyrolysis) of naphtha or paraffinic gases in the petrochemical industry, and for catalyst deactivation in processes using supported Ni catalysts at high temperatures. Characterization of the carbon on Ni catalysts is desirable. In particular, the question whether the carbon is found only on the surface of Ni, or whether it also diffuses or dissolves in Ni, needs to be answered. Information on this is sought here from temperature programmed combustion of the carbon on/in Ni and from x-ray photoelectron spectroscopy (XPS). The very slow combustion of the C in the catalyst and an XPS study of the depth composition profile of the catalyst indicate that the C has diffused or dissolved into the bulk of Ni and a part of it is in a carbidic form.

De DeRen, J. (Laboratorium voor Petrochemische Techniek, Gent, Belgium); Menon, P.G.; Froment, G.F.; Haemers, G.

1981-07-01T23:59:59.000Z

424

Hydrogen Production by Low-temperature Steam Reforming of Bio-oil over Ni/HZSM-5 Catalyst  

Science Journals Connector (OSTI)

We investigated high catalytic activity of Ni/HZSM-5 catalysts synthesized by the impregnation method, which was successfully applied for low-temperature steam reforming of bio-oil. The influences of the catalyst composition, reforming temperature and the molar ratio of steam to carbon fed on the stream reforming process of bio-oil over the Ni/HZSM-5 catalysts were investigated in the reforming reactor. The promoting effects of current passing through the catalyst on the bio-oil reforming were also studied using the electrochemical catalytic reforming approach. By comparing Ni/HZSM-5 with commonly used Ni/Al2O3 catalysts, the Ni20/ZSM catalyst with Ni-loading content of about 20% on the HZSM-5 support showed the highest catalytic activity. Even at 450 C, the hydrogen yield of about 90% with a near complete conversion of bio-oil was obtained using the Ni20/ZSM catalyst. It was found that the performance of the bio-oil reforming was remarkably enhanced by the HZSM-5 supporter and the current through the catalyst. The features of the Ni/HZSM-5 catalysts were also investigated via X-ray diffraction, inductively coupled plasma and atomic emission spectroscopy, hydrogen temperature-programmed reduction, and Brunauer-Emmett-Teller methods.

Song-bai Qiu; Lu Gong; Lu Liu; Cheng-gui Hong; Li-xia Yuan; Quan-xin Li

2011-01-01T23:59:59.000Z

425

Microstructure and magnetoelectric properties in Pb,,ZrxTi1-x...O3Ni composite ferroic films  

E-Print Network [OSTI]

Microstructure and magnetoelectric properties in Pb,,ZrxTi1-x...O3­Ni composite ferroic films 15213 Presented on 31 October 2005; published online 19 April 2006 Ferroic composite thin films composite films grown on SiO2/Si substrates at 650 °C, a perovskite structure was obtained when the Ni

Laughlin, David E.

426

Overall photocatalytic water splitting with NiOxSrTiO3 a revised Troy K. Townsend,a  

E-Print Network [OSTI]

catalysts assumes water oxidation to occur at the early transition metal oxide and water reduction at NiOx­La : KTaO3, and many layered perovskites. Introduction Splitting water into hydrogen and oxygen gas usingOverall photocatalytic water splitting with NiOx­SrTiO3 ­ a revised mechanism Troy K. Townsend

Osterloh, Frank

427

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors  

Science Journals Connector (OSTI)

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors ... Therefore, the active surface area of the Ni3S2 nanoparticles is increased, which further enhances the capacitive performance of the composite electrode. ... nickel sulfide; carbon nanotube; composite; cathode material; asymmetric supercapacitor ...

Chao-Shuan Dai; Pei-Yi Chien; Jeng-Yu Lin; Shu-Wei Chou; Wen-Kai Wu; Ping-Hsuan Li; Kuan-Yi Wu; Tsung-Wu Lin

2013-11-05T23:59:59.000Z

428

Direct Laser Deposition of a Single-Crystal Ni3Al-Based IC221W Alloy  

E-Print Network [OSTI]

process based on laser cladding, which involves laser processing fine metallic powders into fully denseDirect Laser Deposition of a Single-Crystal Ni3Al-Based IC221W Alloy WEIPING LIU and J.N. Du221W alloy were produced on a SX Ni-base superalloy substrate by means of the laser-engineered net

DuPont, John N.

429

Synthesis of FeNi3 Alloyed Nanoparticles by Hydrothermal Reduction Qilong Liao,, Rina Tannenbaum, and Zhong Lin Wang*,  

E-Print Network [OSTI]

method.12 The hydrothermal process appears to be a very effective method for preparing alloyedSynthesis of FeNi3 Alloyed Nanoparticles by Hydrothermal Reduction Qilong Liao,, Rina Tannenbaum paper presents a facile and low-cost hydrothermal method to synthesize stoichiometric FeNi3 alloy

Wang, Zhong L.

430

Structural model for the Al72Ni20Co8 decagonal quasicrystals National Renewable Energy Laboratory, Golden, Colorado 80401  

E-Print Network [OSTI]

Structural model for the Al72Ni20Co8 decagonal quasicrystals Yanfa Yan National Renewable Energy, Oak Ridge, Tennessee 37831 Received 15 February 2000 We propose a structure model for the Al72Ni20Co8 decagonal quasicrystals based on its 2 -inflated Al13Co4 approximant phase: Applying a 105 screw operation

Pennycook, Steve

431

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic glasses  

E-Print Network [OSTI]

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic June 2010 The corrosion properties of two Zr-based bulk metallic glass, Zr41Ti14Cu12Ni10Be23 LM1 and Zr potential, LM1b showed superior corrosion resistance to LM1. Under identical sample preparation and testing

Zheng, Yufeng

432

A206 74th Annual Meeting of the Meteoritical Society: Abstracts DIFFERENTIATION OF Fe-Ni SPHERULES IN IMPACT GLASS  

E-Print Network [OSTI]

-Ni SPHERULES IN IMPACT GLASS M. Schaffer, T. Kasama, R. E. Dunin-Borkowski , A. N. MacDonald and C. Bender Koch. University of Copenhagen, Denmark Metallic, micron sized Fe-Ni spherules are frequently reported from glasses indicator of impact details unexploited. In this work on the impact glass from Wabar we report

Dunin-Borkowski, Rafal E.

433

Vacancy ordered phases in AlCuNi as average lattices Anandh Subramaniam a,*, S. Ranganathan b  

E-Print Network [OSTI]

Vacancy ordered phases in Al­Cu­Ni as average lattices Anandh Subramaniam a,*, S. Ranganathan b, Bangalore 560012, India Abstract Vacancy ordered phases (VOP) in the Al­Cu­Ni system have an arrangement. Introduction Vacancy ordered phases (VOP) in Al-TM (transition metal) systems are a special class of structures

Subramaniam, Anandh

434

(La0.3Ge0.7)(Ni0.85Ge0.15)2Ge2  

Science Journals Connector (OSTI)

It contains the standardized crystallographic data set of (La0.3Ge0.7)(Ni0.85Ge0.15)2Ge2 representing the structure type (La0.30Ge0.70)(Ni0.85Ge0.15)2Ge2.

P. Villars; K. Cenzual; J. Daams

2011-01-01T23:59:59.000Z

435

Determination of mechanical properties of Ni-Cr-P amorphous alloys  

E-Print Network [OSTI]

DETERMINATION OF MECHANICAL PROPERTIES OF Ni-Cr-P AMORPHOUS ALLOYS A Thesis by SWAROOP KUMAR R. KONDLAPUDI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree.... Kondlapudi, B. E. , Qsmania University Co-Chairs of Advisory Committee : Dr. A. wolfenden Dr. R. Griffin A study of the mechanical properties of Ni80 xCrxPgp amorphous alloys (x = 0 to 40 at% in steps of 5. 0) has been undertaken at Texas A&M University...

Kondlapudi, Swaroop Kumar R

2012-06-07T23:59:59.000Z

436

Comment on the Evidence for a Monopole Resonance at Approximately 20 Mev in Ni-58  

E-Print Network [OSTI]

be accompanied by a brief abstract and a keyword abstract. Comment on the evidence for a monopole resonance at approximately 20 MeV in 5sNi U. Garg, P. Bogucki, J. D. Bronson, Y. -W. Lui, C. M. Rozsa, * and D. H. Youngblood Cyclotron Institute, Texas AckM... Uniuersity, College Station, Texas 77843 (Received 23 September 1981) Small-angle inelastic a scattering data for "Ni at 129 MeV have been reanalyzed with the giant resonance peak parameters suggested by Bertrand et al. The two components of the giant...

Garg, U.; Bogucki, P.; Bronson, J. D.; Lui, YW; Rozsa, C. M.; Youngblood, David H.

1982-01-01T23:59:59.000Z

437

Skladenjske posebnosti sloven?ine v razmerjih glagol vezljivost stav?ni vzorec  

E-Print Network [OSTI]

zdruuje osebkovo-povedkovodolo?ilno vlogo (tj. zdruljivost/kompatibilnost oz. medsebojno odvisnost osebkove in poved- kovodolo?ilne vloge, tako da je osebkova samo formalnostavkotvorna vloga, povedkovodolo?ilna vloga pa je hkrati povedkovnika... pravega konkretnega osebka in zato tudi brez osebila oz. kon?nikega morfema (za izraanje oseb oz. osebka), am- pak ima za izraanje samo oblikovne/formalne dolo?nosti (na samo izrazni ravnini), tj. kon?niko obliko za tretjo osebo ednine, ki v zloenih...

ele, Andreja

2011-01-01T23:59:59.000Z

438

Magnetic and superconducting phase diagrams in ErNi2B2C  

SciTech Connect (OSTI)

We present measurements of the superconducting upper critical field Hc2(T) and the magneticphasediagram of the superconductor ErNi2B2C made with a scanning tunneling microscope (STM). The magnetic field was applied in the basal plane of the tetragonal crystal structure. We have found large gapless regions in the superconductingphasediagram of ErNi2B2C, extending between different magnetic transitions. A close correlation between magnetic transitions and Hc2(T) is found, showing that superconductivity is strongly linked to magnetism.

Galvis, J.A.; Crespo, M.; Guillamon, I.; Suderow, Hermann; Vieira, S.; Garcia Hernandez, M.; Budko, Serguei; Canfield, Paul

2012-03-30T23:59:59.000Z

439

A study on the dual-phase treatment of weathering steel 09CuPCrNi  

Science Journals Connector (OSTI)

Dual-phase treatment processes, the resultant microstructures and the corresponding mechanical behavior and properties of weathering steel 09CuPCrNi have been studied. The results show that the microstructures of weathering steel 09CuPCrNi after intercritical quenching are characterized by an irregular distribution of island-shaped martensite in the matrix of equi-axed ferrite grains. Favorable mechanical properties and cold formability can be obtained through the intercritical quenching at 780 C. The dual-phase-treated steel is superior in weldability to the as-received hot-rolled steel and its atmospheric corrosion resistance is better than that of the original.

Chunling Zhang; Dayong Cai; Bo Liao; Tianchen Zhao; Yunchang Fan

2004-01-01T23:59:59.000Z

440

Surface segregation effects in electrocatalysis: Kinetics ofoxygen reduction reaction on polycrystalline Pt3Ni alloy surfaces  

SciTech Connect (OSTI)

Effects of surface segregation on the oxygen reduction reaction (ORR) have been studied on a polycrystalline Pt3Ni alloy in acid electrolyte using ultra high vacuum (UHV) surface sensitive probes and the rotating ring disk electrode (RRDE) method. Preparation, modification and characterization of alloy surfaces were done in ultra high vacuum (UHV). Depending on the preparation method, two different surface compositions of the Pt3Ni alloy are produced: a sputtered surface with 75 % Pt and an annealed surface (950 K ) with 100 % Pt. The latter surface is designated as the 'Pt-skin' structure, and is a consequence of surface segregation, i.e., replacement of Ni with Pt atoms in the first few atomic layers. Definitive surface compositions were established by low energy ion scattering spectroscopy (LEISS). The cyclic voltammetry of the 'Pt-skin' surface as well as the pseudocapacitance in the hydrogen adsorption/desorption potential region is similar to a polycrystalline Pt electrode. Activities of ORR on Pt3Ni alloy surfaces were compared to polycrystalline Pt in 0.1M HClO4 electrolyte for the observed temperature range of 293 < T < 333 K. The order of activities at 333 K was: 'Pt-skin' > Pt3Ni (75% Pt) > Pt with the maximum catalytic enhancement obtained for the 'Pt-skin' being 4 times that for pure Pt. Catalytic improvement of the ORR on Pt3Ni and 'Pt-skin' surfaces was assigned to the inhibition of Pt-OHad formation (on Pt sites) versus polycrystalline Pt. Production of H2O2 on both surfaces were similar compared to the pure Pt. Kinetic analyses of RRDE data confirmed that kinetic parameters for the ORR on the Pt3Ni and 'Pt-skin' surfaces are the same as on pure Pt: reaction order, m=1, two identical Tafel slopes, activation energy, {approx} 21-25 kJ/mol. Therefore the reaction mechanism on both Pt3Ni and 'Pt-skin' surfaces is the same as one proposed for pure Pt i.e. 4e{sup -} reduction pathway.

Stamenkovic, V.; Schmidt, T.J.; Ross, P.N.; Markovic, N.M.

2002-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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.


441

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect (OSTI)

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system are explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering method. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy are investigated using differential scanning calorimetry and superconducting quantum interference device. Experiments are performed at the Spallation Neutron Source at Oak Ridge National Laboratory to observe the structural and magnetic phase transformations.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Shassere, Benjamin [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Safa-Sefat, Athena [ORNL; Rusanu, Aurelian [ORNL; Brown, Greg [ORNL; Evans III, Boyd Mccutchen [ORNL

2014-01-01T23:59:59.000Z

442

Immobilization of U(VI) from Oxic Groundwater by Hanford 300 Area Sediments and Effects of Columbia River Water  

SciTech Connect (OSTI)

Regions within the U.S. Department of Energy Hanford 300 Area (300 A) site experience periodic hydrologic influences from the nearby Columbia River as a result of changing river stage, which causes changes in groundwater elevation, flow direction and water chemistry. An important question is the extent to which the mixing of Columbia River water and groundwater impacts the speciation and mobility of uranium (U). In this study, we designed experiments to mimic interactions among U, oxic groundwater or Columbia River water, and 300 A sediments in the subsurface environment of Hanford 300 A. The goals were to investigate mechanisms of: 1) U immobilization in 300 A sediments under bulk oxic conditions and 2) U remobilization from U-immobilized 300 A sediments exposed to oxic Columbia River water. Initially, 300 A sediments in column reactors were fed with U(VI)-containing oxic 1) synthetic groundwater (SGW), 2) organic-amended SGW (OA-SGW), and 3) de-ionized (DI) water to investigate U immobilization processes. After that, the sediments were exposed to oxic Columbia River water for U remobilization studies. The results reveal that U was immobilized by 300 A sediments predominantly through reduction (80-85%) when the column reactor was fed with oxic OA-SGW. However, U was immobilized by 300 A sediments through adsorption (100%) when the column reactors were fed with oxic SGW or DI water. The reduced U in the 300 A sediments fed with OA-SGW was relatively resistant to remobilization by oxic Columbia River water. Oxic Columbia River water resulted in U remobilization (?7%) through desorption, and most of the U that remained in the 300 A sediments fed with OA-SGW (?93%) was in the form of uraninite nanoparticles. These results reveal that: 1) the reductive immobilization of U through OA-SGW stimulation of indigenous 300 A sediment microorganisms may be viable in the relatively oxic Hanford 300 A subsurface environments and 2) with the intrusion of Columbia River water, desorption may be the primary process resulting in U remobilization from OA-SGW-stimulated 300 A sediments at the subsurface of the Hanford 300 A site.

Ahmed, B.; Cao, Bin; Mishra, Bhoopesh; Boyanov, Maxim I.; Kemner, Kenneth M.; Fredrickson, Jim K.; Beyenal, Haluk

2012-09-23T23:59:59.000Z

443

Polycrystalline oxides formation during transient oxidation of (001) Cu-Ni binary alloys studied by in situ TEM and XRD.  

SciTech Connect (OSTI)

The nucleation and growth of Cu{sub 2}O and NiO islands due to oxidation of Cu{sub x}Ni{sub 1-x} (001) films were monitored, at various temperatures, by in situ ultra-high vacuum (UHV) transmission electron microscopy (TEM) and in situ synchrotron X-ray diffraction (XRD). In remarkable contrast to our previous observations of Cu and Cu-Au oxidation, irregular-shaped polycrystalline oxide islands formed with respect to the Cu-Ni alloy film, and an unusual second oxide nucleation stage was noted. In situ XRD experiments revealed that NiO formed first epitaxially, then other orientations appeared, and finally polycrystalline Cu{sub 2}O developed as the oxidation pressure was increased. The segregation of Ni and Cu towards or away, respectively, from the alloy surface during oxidation could disrupt the surface and cause polycrystalline oxide formation.

Yang, J. C.; Li, Z. Q.; Sun, L.; Zhou, G. W.; Eastman, J. A.; Fong, D. D.; Fuoss, P. H.; Baldo, P. M.; Rehn, L. E.; Thompson, L. J.; Materials Science Division; Univ.of Pittsburgh; State Univ. of New York at Binghamton

2009-01-01T23:59:59.000Z

444

MONOGRAFIAS DE FISICA VI  

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

at the Latin American School of Physics June 2 7 - August 7, I 9 6 0 RIO DE JANEIRO BRASIL DISCLAIMER Portions of this document may be illegible in electronic image products....

445

LABORATORY VI ROTATIONAL DYNAMICS  

E-Print Network [OSTI]

wheels are everywhere. Balls spin when they are thrown. The earth rotates about its axis. Rotations to predict the outcome of a rotational system. · Choose a useful system when using rotational kinematics of systems. PREPARATION: Read Paul M. Fishbane: Chapter 9, Section 9-1; Chapter 5, Section 5-4. You should

Minnesota, University of

446

VI-1 PAPERS PUBLISHED  

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

1 - March 31, 2012 Isoscalar giant resonances in 48 Ca, Y.-W. Lui, D. H. Youngblood, S. Shlomo, X. Chen, Y. Tokimoto, Krishichayan, M. Anders, and J. Button, Phys. Rev. C 83,...

447

TLE Forum VI  

Science Journals Connector (OSTI)

...barrels of energy every single day. That energy demand is driven...Looking at the per capita oil consumption...with the GDP (Figure...domestic product per capita shows that...with the GDP. The size...International Energy Agency forecasts...predict oil demand in 2030 to...

Sylvie Dale

448

Molecular oxygen adsorbates at a Au/Ni(111) surface alloy and their role in catalytic CO oxidation at 70 - 250 K  

E-Print Network [OSTI]

Oxygen is observed to adsorb molecularly on 0.13 - 0.27 ML Au/Ni(1 111) surface alloys at 77 K, in stark contrast to dissociative adsorption on Ni and no adsorption on Au surfaces. Molecular 02 adsorbates on the Au/Ni(111) ...

Lahr, David Louis

2006-01-01T23:59:59.000Z

449

Micro artificial muscle fiber using NiTi spring for soft robotics Sangbae Kim, Elliot Hawkes, Kyujin Cho, Matthew Jolda, Joe Foley and Robert Wood  

E-Print Network [OSTI]

from shape memory alloy (NiTi) coiled springs. An enhanced spring NiTi model describes the combination of micro-coil spring, we present a novel mesh-worm prototype that utilizes bio-inspired antagonistic structure alteration, NiTi can be restructured into coil springs. Chang et al.[1], discuss the numerous

Wood, Robert

450

Development of a biomarker for Geobacter activity and strain composition: Proteogenomic analysis of the citrate synthase protein during bioremediation of U(VI)  

SciTech Connect (OSTI)

Monitoring the activity of target microorganisms during stimulated bioremediation is a key problem for the development of effective remediation strategies. At the US Department of Energy's Integrated Field Research Challenge (IFRC) site in Rifle, CO, the stimulation of Geobacter growth and activity via subsurface acetate addition leads to precipitation of U(VI) from groundwater as U(IV). Citrate synthase (gltA) is a key enzyme in Geobacter central metabolism that controls flux into the TCA cycle. Here, we utilize shotgun proteomic methods to demonstrate that the measurement of gltA peptides can be used to track Geobacter activity and strain evolution during in situ biostimulation. Abundances of conserved gltA peptides tracked Fe(III) reduction and changes in U(VI) concentrations during biostimulation, whereas changing patterns of unique peptide abundances between samples suggested sample-specific strain shifts within the Geobacter population. Abundances of unique peptides indicated potential differences at the strain level between Fe(III)-reducing populations stimulated during in situ biostimulation experiments conducted a year apart at the Rifle IFRC. These results offer a novel technique for the rapid screening of large numbers of proteomic samples for Geobacter species and will aid monitoring of subsurface bioremediation efforts that rely on metal reduction for desired outcomes.

Wilkins, M.J.; Callister, S.J.; Miletto, M.; Williams, K.H.; Nicora, C.D.; Lovley, D.R.; Long, P.E.; Lipton, M.S.

2010-02-15T23:59:59.000Z

451

Reactivity Effects of Differences Between JEFF-3.1 and ENDF/B-VI.8 in Analysis of Six MASURCA Cores of the R-Z Program  

SciTech Connect (OSTI)

Six early cores of the MASURCA R-Z program were modeled using ERANOS 2.1. These cores were designed such that their neutron spectra would be similar to that of an oxide-fueled sodium-cooled fast reactor, some containing enriched uranium and others containing depleted uranium and plutonium. Effects of modeling assumptions and solution methods both in ECCO lattice calculations and in BISTRO Sn flux solutions were evaluated using JEFF-3.1 cross-section libraries. Reactivity effects of differences between JEFF-3.1 and ENDF/B-VI.8 were also quantified using perturbation theory analysis. The most important nuclide with respect to reactivity differences between cross-section libraries was 23Na, primarily a result of differences in the angular dependence of elastic scattering which is more forward-peaked in ENDF/B-VI.8 than in JEFF-3.1. Differences in 23Na inelastic scattering cross-sections between libraries also generated significant differences in reactivity, more due to the differences in magnitude of the cross-sections than the angular dependence. The nuclide 238U was also found to be important with regard to reactivity differences between the two libraries mostly due to a large effect of inelastic scattering differences and two smaller effects of elastic scattering and fission cross-sections. In the cores which contained plutonium, 239Pu fission cross-section differences contributed significantly to the reactivity differences between libraries.

MIchael A. Pope

2010-02-01T23:59:59.000Z

452

Experimental and theoretical analysis of a nondispersive solvent extraction pilot plant for the removal of Cr(VI) from a galvanic process wastewaters  

SciTech Connect (OSTI)

The scale-up of a chemical process from the results obtained in a laboratory scale involves a high degree of uncertainty. Experimental tests in pilot plants are therefore necessary in order to decrease that uncertainty. When the processes are not simple, these experimental tests should be supplemented by simulation studies which are a highly useful tool in the analysis of a chemical plant. A nondispersive solvent extraction (NDSX) plant includes two processes, extraction and stripping, coupled by an organic phase. Because of this fact, the variables of the system are interrelated, making the prediction of the behavior of the whole system difficult. Because of this complexity, in this work, the behavior of a NDSX pilot plant has been experimentally and theoretically analyzed. The removal and recovery of chromium(VI) from wastewaters of a galvanic process have been used as a case study for the simulation and experimental analysis of the NDSX process. The mathematical model consists of nonlinear partial differential equations which are solved using the process simulator gPROMS. Once the suitability of the proposed model and parameters for the description of removal and concentration of Cr(VI) in the NDSX pilot plant was checked, the simulation was used to perform a sensitivity analysis to operating variables such as flow rates, volumes, total carrier concentration, and initial complex species concentration. The theoretically predicted behavior was checked with some experimental results, and a satisfactory performance of the pilot plant was achieved.

Alonso, A.I.; Galan, B.; Gonzalez, M.; Ortiz, I. [Univ. de Cantabria, Santander (Spain). Dept. Quimica] [Univ. de Cantabria, Santander (Spain). Dept. Quimica

1999-04-01T23:59:59.000Z

453

Hydrogen production by steam reforming of simulated liquefied natural gas (LNG) over mesoporous nickelMalumina (M=Ni, Ce, La, Y, Cs, Fe, Co, and Mg) aerogel catalysts  

Science Journals Connector (OSTI)

Mesoporous nickelMalumina aerogel catalysts (denoted as NiMAE) with different second metal (M=Ni, Ce, La, Y, Cs, Fe, Co, and Mg) were prepared by a single-step solgel method and a subsequent CO2 supercritical drying method. The effect of second metal of mesoporous nickelMalumina aerogel catalysts on their physicochemical properties and catalytic activity for steam reforming of simulated liquefied natural gas (LNG) was investigated. Textural and chemical properties of NiMAE catalysts were strongly influenced by the identity of second metal. Nickel species were highly dispersed on the surface of NiMAE catalysts through the formation of nickel aluminate phase. In the steam reforming of LNG, both LNG conversion and hydrogen yield decreased in the order of NiLaAE>NiCeAE>NiYAE>NiCsAE>NiNiAE>NiFeAE>NiCoAE>NiMgAE. Average nickel diameter of NiMAE catalysts was well correlated with LNG conversion and hydrogen yield over the catalysts. Among the catalysts tested, NiLaAE catalyst exhibited the best catalytic performance due to its smallest average nickel diameter. Furthermore, NiLaAE catalyst exhibited a strong capability of facilitating heat and mass transfer of reactant and product during the steam reforming of LNG. Watergas shift reaction governed the steam reforming reaction over NiLaAE catalyst under the steam-rich reaction condition (steam/carbon>2).

Jeong Gil Seo; Min Hye Youn; Yongju Bang; In Kyu Song

2011-01-01T23:59:59.000Z

454

Magnetotransport properties of lithographically defined lateral CoNi80Fe20 wires  

E-Print Network [OSTI]

magnetic tunneling junction. We observed four distinct peaks in the magnetoresis- tance MR curves) and an asymmetric shift in the MR peak positions of the Ni80Fe20 wires below a critical point of 20 K. This asymmet substrate using the optical lithography and a combination of soft and hard lift-off techniques. Arrays of Si

Adeyeye, Adekunle

455

Improved Oxygen Reduction Activity on Pt3Ni(111) via Increased Surface Site Availability  

Science Journals Connector (OSTI)

...state-of-the-art Pt/C catalysts for PEMFC. The Pt3Ni(111...membrane fuel cell (PEMFC) is used in a demanding...platinum-loading) in current PEMFC stacks is needed...surface area in the cathode must be greatly...if stable cathode catalysts, with an order...

Vojislav R. Stamenkovic; Ben Fowler; Bongjin Simon Mun; Guofeng Wang; Philip N. Ross; Christopher A. Lucas; Nenad M. Markovi?

2007-01-26T23:59:59.000Z

456

SOME FOLIATIONS ON SURFACES IN CHARACTERISTIC 2. N.I. Shepherd-Barron  

E-Print Network [OSTI]

.I. Shepherd-Barron Math. Dept., Columbia University, New York NY 10027 x0. Introduction. 1 #12;2 N.I. SHEPHERD-BARRON Theorem 1.1. If X is a classical Enriques] that if A = 0, then h0( X ) = 0, and so A > 0. Lemma 1.3. There is a divisor B with A = 2B. (Note

Shepherd-Barron, Nick

457

Surface Treatment of NiO Hole Transport Layers for Organic Solar Cells  

SciTech Connect (OSTI)

Recent advances in the power-conversion efficiency of organic photovoltaics (OPVs) has largely been realized through the development of conjugated polymer absorber materials that provide for increased overlap with the solar spectrum as well as proper energy level offset with the electron acceptor. These allow for increased photocurrent and photovoltage, thus resulting in increased performance. Such systems could further be improved through the application of contact materials that have been tuned to minimize losses in carrier and potential losses at the charge-extraction interfaces. To date, these devices continue to use contacts that have not been optimized for the specific active layer components employed. Here, we demonstrate that the electrical and contact properties of NiO can be tuned through careful control of the deposition parameters as well as through surface treatments. The effects of the NiO thin-film processing and properties are investigated for application as a hole transport layer (HTL) in poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester OPV devices. Devices based on the NiO HTLs demonstrate equal performance to those employing poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) HTLs. Furthermore, the NiO HTLs enable the application of zinc-oxide-based materials as transparent electrodes.

Berry, Joseph J.; Widjonarko, N. Edwin; Bailey, Brian A.; Sigdel, Ajaya K.; Ginley, David S.; Olson, Dana C.

2010-01-01T23:59:59.000Z

458

Theoretical study of the photoelectron spectrum of (n5-C5H5)Ni(NO)  

E-Print Network [OSTI]

The valence photoelectron spectrum of cyclopentadienyl nickel nitrosyl (CpNiNO) was computed to determine the ion state orbital ordering of the 5e1, 7a1, and 3e2 bands. Calculations were performed with Hartree-Fock theory, density functional theory...

Miller, Thomas F.

2013-02-22T23:59:59.000Z

459

Effects of heat dissipation on unipolar resistance switching in Pt/NiO/Pt capacitors  

E-Print Network [OSTI]

Effects of heat dissipation on unipolar resistance switching in Pt/NiO/Pt capacitors S. H. Chang,1 151-747, Republic of Korea 3 School of Materials Science and Engineering, Seoul National University tBE and investigated their resistance switching behaviors. The capacitors with tBE 50 nm exhibited

Kahng, Byungnam

460

Ambient pressure thermal desorption spectroscopy (AP-TDS) of NiO/SiO2 catalysts  

Science Journals Connector (OSTI)

The Sabatier reaction is a key process in the power-to-gas application which is considered to contribute to...2 (NiO/SiO2) which is commonly used in the Sabatier reaction. A novel technique for the characteriza...

M. Stdter; K. Mller; F. Rachow; M. Richter; D. Schmeier

2013-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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.


461

Recent advances in alloy design of Ni{sub 3}Al alloys for structural use  

SciTech Connect (OSTI)

This is a comprehensive review of recent advances in R&D of Ni{sub 3}Al-based alloys for structural use at elevated temperatures in hostile environments. Recent studies indicate that polycrystalline Ni{sub 3}Al is intrinsically quite ductile at ambient temperatures, and its poor tensile ductility and brittle grain-boundary fracture are caused mainly by moisture-induced hydrogen embrittlement when the aluminide is tested in moisture- or hydrogen-containing environments. Tensile ductility is improved by alloying with substitutional and interstitial elements. Among these additives, B is most effective in suppressing environmental embrittlement and enhancing grain-boundary cohesion, resulting in a dramatic increase of tensile ductility at room temperature. Both B-doped and B-free Ni{sub 3}Al alloys exhibit brittle intergranular fracture and low ductility at intermediate temperatures (300-850 C) because of oxygen-induced embrittlement in oxidizing environments. Cr is found to be most effective in alleviating elevated-temperature embrittlement. Parallel efforts on alloy development using physical metallurgy principles have led to development of several Ni{sub 3}Al alloys for industrial use. The unique properties of these alloys are briefly discussed. 56 refs, 15 figs, 3 tabs.

Liu, C.T.; George, E.P.

1996-12-31T23:59:59.000Z

462

P0703-Hoegh The H2/H2O/Ni/Zirconia Point Electrode  

E-Print Network [OSTI]

on a model system of the SOFC (solid oxide fuel cell) anode. The model system was made by pressing a bent Ni) dominate when the cell is operated as a fuel cell (SOFC) and as an electrolyzer cell (SOEC, solid oxide Jens Høgh1 , Karin Vels Hansen1 , Ib Chorkendorff2 , Torben Jacobsen2 and Mogens Mogensen1 1 Fuel Cells

463

Evolution of microstructures inside the Ni-YSZ anode of a solid oxide fuel cell  

E-Print Network [OSTI]

Evolution of microstructures inside the Ni-YSZ anode of a solid oxide fuel cell Jeff Lillibridge Department of Mechanical & Aerospace Engineering Advisor: Mikko Haataja #12;What is a solid oxide fuel cell microstructuralcoarsening processes to electrochemical performancein solid oxide fuel cells: An integrated modeling approach

Petta, Jason

464

Study on Degradation of Solid Oxide Fuel Cell With Pure Ni Anode Zhenjun Jiaoa  

E-Print Network [OSTI]

Study on Degradation of Solid Oxide Fuel Cell With Pure Ni Anode Zhenjun Jiaoa , Naoki Shikazonoa Solid oxide fuel cell (SOFC) has attracted more and more attentions in the last few decades hydrogen as a fuel and pure oxygen as an oxidant. Anode-reference static current method, with a current

Kasagi, Nobuhide

465

Batch and Kinetic Studies of ni adsorption on Highly Humified newfoundland Peat  

E-Print Network [OSTI]

in the environment depend on soil geology and industrial activities. Ni mining (with Co recovery) in Newfoundland and labrador (Nl) could become a source of pollution if lime precipitation only is used for effluent treatment was air dried and sieved and fractions 850 µm constituting about 90% of the peat were separated and used

Coles, Cynthia

466

Transition metal interaction and Ni-Fe-Cu-Si phases in silicon T. Buonassisi,b  

E-Print Network [OSTI]

precipitation may reduce the lattice mismatch compared to single-metal precipitates, rendering mixed-metal-silicide recombination activity of metal silicide clusters. Common solar cell materials are not contaminated with justTransition metal interaction and Ni-Fe-Cu-Si phases in silicon M. Heuer,a T. Buonassisi,b A. A

467

Development of a nanostructure microstructure in the AlNi system using the electrospark deposition process  

Science Journals Connector (OSTI)

Electrospark deposition (ESD) was applied to produce aluminumnickel coatings consisting of nanostructured Al and Al3Ni phases. An ESD electrode was manufactured from a hypo-eutectic aluminumAl3Ni alloy using chill casting. Line deposition tests were performed to determine the optimal processing parameters resulting in a high quality deposit. X-ray diffraction (XRD) as well as optical and field emission scanning electron microscopy (FE-SEM), were performed to determine the composition and microstructure of the resulting depositions. It was determined that a capacitance of 20?F and a voltage of 100V resulted in the highest quality deposition. Furthermore it was determined that the ESD process was capable of producing a microstructure consisting of highly refined aluminum and Al3Ni phases. The grain size of the aluminum phase was calculated, through the application of the Scherrer equation, to be ?25nm. While, via scanning electron microscopy the grain size of the Al3Ni phase was determined to be ?44nm. Also it was determined that multiple deposition passes resulted in increasing the thickness of the deposit, however resulted in decreased deposit quality. Furthermore, it was determined that increasing the energy-density (pulse-energy divided by electrode cross-sectional area) resulted in increasing deposit thickness, until a maximum was obtained using an energy-density of ?0.8J/mm2. However, increasing the energy-density beyond this point resulted in decreased deposit quality.

D.W. Heard; M. Brochu

2010-01-01T23:59:59.000Z

468

Tic-Ni-based composite materials dispersion-strengthened by nanoparticles for electrospark deposition  

Science Journals Connector (OSTI)

The macrokinetic characteristic properties of the combustion process of mixtures in the TiC-Ni system with additives of nanosized ZrO2, Al2O3, Mo-Al2O3 powders, as well as the phase composition, structure, and pr...

E. A. Levashov; Yu. S. Pogozhev; A. E. Kudryashov

2008-10-01T23:59:59.000Z

469

Collision Detection System Andrew Boissonnault, Akilesh Krishnamurthy Daiheng Ni, Russell Tessier  

E-Print Network [OSTI]

and of the Civil Engineering Department is working to develop a vehicle collision detection system. The systemCollision Detection System Andrew Boissonnault, Akilesh Krishnamurthy Daiheng Ni, Russell Tessier that would be mounted on the front of the vehicle. This system will gather information from all

Mountziaris, T. J.

470

Factors Affecting Ni and Zn Hydroxide Precipitate Formation in Soils. (S02-peltier222185-oral)  

E-Print Network [OSTI]

Factors Affecting Ni and Zn Hydroxide Precipitate Formation in Soils. (S02-peltier222185-oral) Authors: E.F. Peltier* - Univ. of Delaware D.L. Sparks - Univ. of Delaware Abstract: The formation matter in the soil. Speaker Information: Edward Peltier, Univ. of Delaware, Dept. of Plant and Soil

Sparks, Donald L.

471

Ni.sub.3 Al-based intermetallic alloys having improved strength above 850.degree. C.  

DOE Patents [OSTI]

Intermetallic alloys composed essentially of: 15.5% to 17.0% Al, 3.5% to 5.5% Mo, 4% to 8% Cr, 0.04% to 0.2% Zr, 0.04% to 1.5% B, balance Ni, are characterized by melting points above 1200.degree. C. and superior strengths at temperatures above 1000.degree. C.

Liu, Chain T. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

472

Ni3Al-based alloys for die and tool application  

DOE Patents [OSTI]

A novel Ni.sub.3 Al-based alloy exhibits strengths and hardness in excess of the standard base alloy IC-221M at temperatures of up to about 1000.degree. C. The alloy is useful in tool and die applications requiring such temperatures, and for structural elements in engineering systems exposed to such temperatures.

Liu, Chain T. (Oak Ridge, TN); Bloom, Everett E. (Kingston, TN)

2001-01-01T23:59:59.000Z

473

Fabrication of Ni-shims using UV-moulding as an intermediate step  

Science Journals Connector (OSTI)

We fabricated nickel-shims including various types of structures with dimensions from hundreds of nanometers to several microns. The mastering process was made by electron-beam lithography, lift-off and reactive ion etching techniques. Then the structures ... Keywords: Ni-shims, UV-moulding

Juha Pietarinen; Samuli Siitonen; Noora Tossavainen; Janne Laukkanen; Markku Kuittinen

2006-03-01T23:59:59.000Z

474

Measuring relative performance of an EDS detector using a NiO standard.  

SciTech Connect (OSTI)

A method for measuring the relative performance of energy dispersive spectrometers (EDS) on a TEM is discussed. A NiO thin-film standard fabricated at Sandia CA is used. A performance parameter,, is measured and compared to values on several TEM systems.

Sugar, Joshua Daniel; Kotula, Paul Gabriel [Sandia National Laboratories, Albuquerque, NM

2013-09-01T23:59:59.000Z

475

Evolution of Graphene Growth on Ni and Cu by Carbon Isotope Labeling  

E-Print Network [OSTI]

Evolution of Graphene Growth on Ni and Cu by Carbon Isotope Labeling Xuesong Li, Weiwei Cai, Luigi Instruments Incorporated, Dallas, Texas 75243 Received August 3, 2009 ABSTRACT Large-area graphene growth) of hydrocarbons has shown some promise in growing large-area graphene or few-layer graphene films on metal

476

Magnetization and EPR studies of the single molecule magnet Ni4 with integrated sensors  

E-Print Network [OSTI]

Magnetization and EPR studies of the single molecule magnet Ni4 with integrated sensors G. de 2007 Integrated magnetic sensors that allow simultaneous EPR and magnetization measurements have been with a micro-Hall effect magnetometer. EPR spectroscopy is used to determine the energy splitting between

del Barco, Enrique

477

Ni-NTA Magnetic Agarose Beads Handbook 12/200120 Detailed Protocols  

E-Print Network [OSTI]

Protocol Ni-NTA Magnetic Agarose Beads Handbook 12/200120 Detailed Protocols Protocol 1. Cell lysis appropriately. Adding 10 mM imidazole, inhibits binding of nontagged proteins. If the tagged protein does-NTA Magnetic Agarose Beads Handbook 12/2001 21 4. Sonicate or homogenize on ice to lyse cells (6 times for 10

Lebendiker, Mario

478

Comparative Studies of Magnetism in KNiF3 and K2NiF4  

Science Journals Connector (OSTI)

Bulk magnetic properties of the related antiferromagnets KNiF3 and K2NiF4 are analyzed by use of both high- and low-temperature theoretical methods. A crystal-field theory for the Ni2+ ion is outlined, using the strong-field coupling scheme, and is used to construct relevant spin Hamiltonians for the two systems. KNiF3 is found to be a simple-cubic antiferromagnet for which all except nearest-neighbor interactions are negligible. Writing an exchange interaction JSiSj between nearest-neighbor spins Si and Sj, the experimental observations are quantitatively fitted for J=894 K with a suggestion of a small temperature dependence of J. Reasons are put forward to suggest that K2NiF4 is, to a very good approximation, a two-dimensional quadratic-layer antiferromagnet with a magnetic state which, over a large temperature region, shows a long-range order in two dimensions but not in the third. A good theoretical interpretation of most of the published experimental data can be obtained using such a picture. K2NiF4 is made up of NiF2 magnetic planes, which are essentially the same as those found in KNiF3, but with these magnetic layers separated in the third dimension by two nonmagnetic KF layers. We find an intraplane exchange J?125 K and an interplane exchange J? which is at least an order of magnitude smaller and probably ferromagnetic in sign. A number of major differences between typical two- and three-dimensional magnetic structures are discussed, and some experiments are outlined for which the use of two- dimensional systems like K2NiF4 could provide new and interesting information concerning magnetic cooperative phenomena. Finally, the possible origins of the difference in exchange values J between KNiF3 and K2NiF4 are discussed, and the relevance of our findings in connection with the supposedly anomalous properties of another series containing two-dimensional antiferromagnets, namely, the calcium manganites, is assessed.

M. E. Lines

1967-12-10T23:59:59.000Z

479

Evaluation of high strength, high conductivity CuNiBe alloys for fusion energy applications  

SciTech Connect (OSTI)

The unirradiated tensile properties for several different heats and thermomechanical treatment conditions of precipitation strengthened Hycon 3HPTM CuNiBe (Cu-2%Ni-0.35%Be in wt.%) have been measured over the temperature range of 20-500 C for longitudinal and long transverse orientations. The room temperature electrical conductivity has also been measured for several heats, and the precipitate microstructure was characterized using transmission electron microscopy. The CuNiBe alloys exhibit very good combination of strength and conductivity at room temperature, with yield strengths of 630-725 MPa and electrical conductivities of 65-72% International Annealed Copper Standard (IACS). The strength remained relatively high at all test temperatures, with yield strengths of 420-520 MPa at 500 C. However, low levels of ductility (<5% uniform elongation) were observed at test temperatures above 200-250 C, due to flow localization near grain boundaries (exacerbated by having only 10-20 grains across the gage thickness of the miniaturized sheet tensile specimens). Scanning electron microscopy observation of the fracture surfaces found a transition from ductile transgranular to ductile intergranular fracture with increasing test temperature. Fission neutron irradiation to a dose of ~0.7 displacements per atom (dpa) at temperatures between 100 and 240 C produced a slight increase in strength and a significant decrease in ductility. The measured tensile elongation increased with increasing irradiation temperature, with a uniform elongation of ~3.3% observed at 240 C. The electrical conductivity decreased slightly following irradiation, due to the presence of defect clusters and Ni, Zn, Co transmutation products. Considering also previously published fracture toughness data, this indicates that CuNiBe alloys have irradiated tensile and electrical properties comparable or superior to CuCrZr and oxide dispersion strengthened copper at temperatures <250 C, and may be an attractive candidate for certain fusion energy structural applications. Conversely, CuNiBe may not be preferred at intermediate temperatures of 250-500 C due to the poor ductility and fracture toughness of CuNiBe alloys at temperatures >250 C. The potential deformation mechanisms responsible for the transition from transgranular to intergranular fracture are discussed. The possible implications for other precipitation hardened alloys such as nickel based superalloys are briefly discussed.

Zinkle, Steven J [ORNL] [ORNL

2014-01-01T23:59:59.000Z

480

Steam Reforming of Methane over Ni Catalysts Prepared from Hydrotalcite-Type Precursors: Catalytic Activity and Reaction Kinetics  

Science Journals Connector (OSTI)

Abstract Ni/Mg-Al catalysts derived from hydrotalcite-type precursors were prepared by a co-precipitation technique and applied to steam reforming of methane. By comparison with Ni/?-Al2O3 and Ni/?-Al2O3 catalysts prepared by incipient wetness impregnation, the Ni/Mg-Al catalyst presented much higher activity as a result of higher specific surface area and better Ni dispersion. The Ni/Mg-Al catalyst with a Ni/Mg/Al molar ratio of 0.5:2.5:1 exhibited the highest activity for steam methane reforming and was selected for kinetic investigation. With external and internal diffusion limitations eliminated, kinetic experiments were carried out at atmospheric pressure and over a temperature range of 823?973K. The results demonstrated that the overall conversion of CH4 and the conversion of CH4 to CO2 were strongly influenced by reaction temperature, residence time of reactants as well as molar ratio of steam to methane. A classical Langmuir-Hinshelwood kinetic model proposed by Xu and Froment (1989) fitted the experimental data with excellent agreement. The estimated adsorption parameters were consistent thermodynamically.

Yang Qi; Zhenmin Cheng; Zhiming Zhou

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "vi rgi ni" 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.


481

Phase formation and morphological stability of ultrathin Ni-Co-Pt silicide films formed on Si(100)  

SciTech Connect (OSTI)

Ultrathin Ni, Co, and Pt films, each no more than 4?nm in thickness, as well as their various combinations are employed to investigate the competing growth of epitaxial Co{sub 1-y}Ni{sub y}Si{sub 2} films against polycrystalline Pt{sub 1-z}Ni{sub z}Si. The phase formation critically affects the morphological stability of the resulting silicide films, with the epitaxial films being superior to the polycrystalline ones. Any combination of those metals improves the morphological stability with reference to their parent individual metal silicide films. When Ni, Co, and Pt are all included, the precise initial location of Pt does little to affect the final phase formation in the silicide films and the epitaxial growth of Co{sub 1-x}Ni{sub x}Si{sub 2} films is always perturbed, in accordance to thermodynamics that shows a preferential formation of Pt{sub 1-z}Ni{sub z}Si over that of Co{sub 1-y}Ni{sub y}Si{sub 2}.

Xu, Peng; Wu, Dongping, E-mail: dongpingwu@fudan.edu.cn [State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433 (China); Kubart, Tomas; Gao, Xindong [Solid-State Electronics, The ngstrm Laboratory, Uppsala University, P.O. Box 534, 75121 Uppsala (Sweden); Zhang, Shi-Li, E-mail: shili.zhang@angstrom.uu.se [State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China and Solid-State Electronics, The ngstrm Laboratory, Uppsala University, P.O. Box 534, 75121 Uppsala (Sweden)

2014-05-15T23:59:59.000Z

482

Three-dimensional microstructural changes in the NiYSZ solid oxide fuel cell anode during operation  

SciTech Connect (OSTI)

Microstructural evolution in solid oxide fuel cell (SOFC) cermet anodes has been investigated using X-ray nanotomography along with differential absorption imaging. SOFC anode supports composed of Ni and yttria-stabilized zirconia (YSZ) were subjected to extended operation and selected regions were imaged using a transmission X-ray microscope. X-ray nanotomography provides unique insight into microstructure changes of all three phases (Ni, YSZ, pore) in three spatial dimensions, and its relation to performance degradation. Statistically significant 3D microstructural changes were observed in the anode Ni phase over a range of operational times, including phase size growth and changes in connectivity, interfacial contact area and contiguous triple-phase boundary length. These observations support microstructural evolution correlated to SOFC performance. We find that Ni coarsening is driven by particle curvature as indicated by the dihedral angles between the Ni, YSZ and pore phases, and hypothesize that growth occurs primarily by means of diffusion and particle agglomeration constrained by a pinning mechanism related to the YSZ phase. The decrease in Ni phase size after extended periods of time may be the result of a second process connected to a mobility-induced decrease in the YSZ phase size or non-uniform curvature resulting in a net decrease in Ni phase size.

Nelson G. J.; Chu Y.; Grew, K.N.; Izzo Jr. J.R.; Lombardo, J.J.; Harris, W.M.; Faes, A.; Hessler-Wyser, A.; Van herle, J.; Wang, S.; Virkar, A.V.; Chiu, W.K.S.

2012-04-07T23:59:59.000Z

483

Anodically electrodeposited Co+Ni mixed oxide electrode: preparation and electrocatalytic activity for oxygen evolution in alkaline media  

SciTech Connect (OSTI)

Co+Ni mixed oxides on Ni substrate were prepared through anodic electrodeposition from Co(NO{sub 3}){sub 2} and Ni(NO{sub 3}){sub 2} aqueous solutions with five different Co{sup 2+}/Ni{sup 2+} ratios beside only Co{sup 2+}. By the electrochemical measurements, the optimum performance in electrocatalytic activity for oxygen evolution reaction in alkaline media was obtained on the Co+Ni mixed oxide deposited from the solution containing Co{sup 2+}/Ni{sup 2+} ratio of 1:1. The mixed oxide is corresponding to about 68at% Co contents with spinel-type NiCo{sub 2}O{sub 4} phase and porosity surface structure. The electrochemical kinetic parameters including exchange current density, Tafel slopes, reaction order with respect to [OH{sup -}] and standard electrochemical enthalpy of activation were analyzed also. A possible mechanism involving the formation of a physisorbed hydrogen peroxide intermediate in a slow electrochemical step was presented, which accounts for the values of the experimental results.

Wu Gang [Innovative Catalysis Program, Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084 (China)]. E-mail: wugang@mail.tsinghua.edu.cn; Li Ning [Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001 (China); Zhou Derui [Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001 (China); Mitsuo, Kurachi [Faculty of Engineering, Kyoto University, Kyoto 606-8283 (Japan); Xu Boqing [Innovative Catalysis Program, Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084 (China)

2004-10-01T23:59:59.000Z

484

Effect of reductant and PVP on morphology and magnetic property of ultrafine Ni powders prepared via hydrothermal route  

SciTech Connect (OSTI)

Graphical abstract: The ultrafine Ni powders with the shapes including sphere, pearl-string, leaf, fish-bone, hexagonal sheet and silknet were prepared through one-step hydrothermal reduction using different reductants. Their saturation magnetization, remanent magnetization and coercivity sequentially increase, and the coercivity of hexagonal sheet-like Ni powders increases by 25% compared with the Ni bulk counterpart. - Highlights: The ultrafine Ni powders with various shapes of sphere, fish-bone, hexagonal sheet, etc. Facile and one-step hydrothermal reduction using three reductants and PVP additive was developed. Magnetic properties of the ultrafine Ni powders with different shapes were measured. Compared with bulk Ni material, coercivity of hexagonal sheet Ni increases by 25%. The formation mechanism of the shapes was suggested. - Abstract: The ultrafine nickel particles with different shapes including sphere, pearl-string, leaf, fish-bone, hexagonal sheet and silknet were prepared through one-step hydrothermal reduction using hydrazine hydrate, sodium hypophosphite and ethylene glycol as reductants, polyvinylpyrrolidone as structure-directing agent. It has been verified with the characterization of X-ray powder diffraction and transmission/scanning electronic microscopy that as-prepared products belong to face-centered cubic structure of nickel microcrystals with high purity and fine dispersity. The magnetic hysteresis loops measured at room temperature reveal that the values of saturation magnetization, remanent magnetization and coercivity rise sequentially from silknet, sphere to hexagonal sheet. In comparison with nickel bulk counterpart, the coercivity of the hexagonal sheet nickel powders increases by 25%.

Zhang, Jun, E-mail: j-zhang@126.com; Wang, Xiucai; Li, Lili; Li, Chengxuan; Peng, Shuge

2013-10-15T23:59:59.000Z

485

Effect of palladium addition on catalytic activity in steam methane reforming over Ni-YSZ porous membrane  

Science Journals Connector (OSTI)

Abstract This study investigated the additive effects of palladium, and the deposition method of palladium on Ni-YSZ porous membrane in steam methane reforming. PdNi-YSZ porous membrane prepared by the wet impregnation method showed superior catalytic activity, where the methane conversion reached 94.6% at 650C, with H2 yield above 3.9. The palladium particles were well dispersed, and the PdNi-YSZ porous membrane exhibited high adsorption capacity for water. The addition of palladium and the deposition method of palladium are very important for the steam methane reforming reaction.

Sang Moon Lee; Sung Chang Hong

2014-01-01T23:59:59.000Z

486

Silicon`s role in determining swelling in neutron-irradiated Fe-Cr-Ni-Si alloys  

SciTech Connect (OSTI)

Two silicon-modified alloy series, one based on Fe-15Cr-20Ni and another based on Fe-15Cr-25Ni were irradiated at target temperatures between 399 and 649{degree}C in EBR-II. The influence of silicon on swelling is more complex than previously envisioned and indicates that silicon plays two or more competing roles while in solution. Radiation-induced formation of {gamma}{prime} (Ni{sub 3}Si) precipitates is dependent on silicon and nickel content, as well as temperature. Precipitation of {gamma}{prime} appears to play only a minor role in void formation.

Sekimura, N. [Tokyo Univ., Tokai, Ibaraki (Japan); Garner, F. A. [Pacific Northwest Lab., Richland, WA (United States); Newkirk, J.W. [Missouri Univ., Rolla, MO (United States)

1991-11-01T23:59:59.000Z

487

Improving the phase stability and oxidation resistance of B-NiAl  

SciTech Connect (OSTI)

High temperature alloys are essential to many industries that require a stable material to perform in harsh oxidative environments. Many of these alloys are suited for specific applications such as jet engine turbine blades where most other materials would either melt or oxidize and crumble (1). These alloys must have a high melting temperature, excellent oxidation resistance, good creep resistance, and decent fracture toughness to be successfully used in such environments. The discovery of Ni based superalloys in the 1940s revolutionized the high temperature alloy industry and there has been continued development of these alloys since their advent (2). These materials are capable of operating in oxidative environments in the presence of combustion gases, water vapor and at temperatures around 1050 C. Demands for increased f uel efficiency, however, has highlighted the need for materials that can be used under similar atmospheres and at temperatures in excess of 1200 C. The current Ni based superalloys are restricted to lower temperatures due to the presence of a number of low melting phases that result in softening of the alloys above 1000 C. Therefore, recent research has been aimed at exploring and developing newer alloy systems that can meet the escalating requirements. This thesis comprises a part of such an effort. The motivation of this work is to develop a novel high temperature alloy system that shows improved performance at higher temperatures than the currently employed alloys. The desired alloy should be in accordance with the requirements established in the National Energy Technolog