National Library of Energy BETA

Sample records for da ta ta

  1. VEHICLE ACCESS PORTALS TA-48 Vicinity TA-36 Vicinity

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

    Pajarito Corridor (Map 4) VEHICLE ACCESS PORTALS TA-48 Vicinity TA-36 Vicinity Drivers of delivery vehicles entering Pajarito Road bounded by NM Highway 4 and Diamond Drive must stop at Post 10 for inspection passes. Protective Force offcers stationed at the Pajarito Corridor VAPs will turn away delivery vehicles that have not been inspected at Post 10. Note: All vehicles (commercial, private, government) are subject to random inspections while on Laboratory property. More Information:

  2. TA1 Room Layout with Newport Laser

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

    SCALE: 12" X 12" N S E W 22.50° JUPITER LASER FACILITY TA1 ROOM TA1 CHAMBER WEST BEAM CABLE COVER VISAR VIDMAR C O N T R O L R A C K

  3. Decontamination and Demolition at TA-21

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

    TA-21 Demolition Decontamination and Demolition at TA-21 On December 1, 2009, LANL began full-scale demolition at TA-21, the Cold War-era complex of buildings that once housed plutonium production and historic, nonweapons research. August 1, 2013 Water sprayed during demolition to protect air quality Water sprayed during demolition to protect air quality The buildings at TA-21 were built as long ago as the 1940s, replacing Manhattan-era facilities and housing labs, offices, and production

  4. TA-55: LANL Plutonium-Processing Facilities

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

    Facilities » TA-55: LANL Plutonium-Processing Facilities TA-55: LANL Plutonium-Processing Facilities TA-55 supports a wide range of national security programs that involve stockpile stewardship, plutonium processing, nuclear materials stabilization, materials disposition, nuclear forensics, nuclear counter-terrorism, and nuclear energy. ...the only fully operational, full capability plutonium facility in the nation. National Security At the Los Alamos National Laboratory (LANL), virtually all

  5. TA-55: LANL Plutonium-Processing Facilities

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

    most modern plutonium science and manufacturing facility, and it is the only fully operational, full capability plutonium facility in the nation. Thus, TA-55 supports a wide...

  6. Memo - Legacy Technical Area (TA)-55 Nitrate Salt Wastes at TA...

    Office of Environmental Management (EM)

    on February 14, 2014, report in Attachment F. Bibliography and References, are available on various public websites. PDF icon Memo - Legacy Technical Area (TA)-55 Nitrate Salt ...

  7. NNSA to Start Moving TA-18 Nuclear Materials | National Nuclear...

    National Nuclear Security Administration (NNSA)

    Assembly Facility (DAF) at the Nevada Test Site in anticipation of shifting the TA-18 ... to move TA-18 operations to the Nevada Test Site," said NNSA Administrator Linton F. ...

  8. Attachment B Visitor Tours at TA-53 TA53-FO-121-001B.4 Preparation Checklist for Visitor Tours at TA-53

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

    Attachment B Visitor Tours at TA-53 TA53-FO-121-001B.4 Preparation Checklist for Visitor Tours at TA-53 This checklist provides reminders of safety and security considerations in preparation and implementation of tours at TA-53. Tour Date: Purpose of Tour or Tour Title: Tour Host and Z#: State Time and Approximate Duration: Tour Type Check all that apply: Educational Outreach/Student Tour with Minors Large Group Tour Other Tour High Level or Distinguished Work Related Tour Preparation, Visitor

  9. CRAD, Emergency Management - Los Alamos National Laboratory TA 55 SST

    Office of Environmental Management (EM)

    Facility | Department of Energy Emergency Management - Los Alamos National Laboratory TA 55 SST Facility CRAD, Emergency Management - Los Alamos National Laboratory TA 55 SST Facility June 2005 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Emergency Management program at the Los Alamos National Laboratory TA 55 SST

  10. Kah-nee-ta Pool & Spa Low Temperature Geothermal Facility | Open...

    Open Energy Info (EERE)

    Kah-nee-ta Pool & Spa Low Temperature Geothermal Facility Jump to: navigation, search Name Kah-nee-ta Pool & Spa Low Temperature Geothermal Facility Facility Kah-nee-ta Sector...

  11. CRAD, Training - Los Alamos National Laboratory TA 55 SST Facility |

    Office of Environmental Management (EM)

    Department of Energy Training - Los Alamos National Laboratory TA 55 SST Facility CRAD, Training - Los Alamos National Laboratory TA 55 SST Facility A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Training Program at the Los Alamos National Laboratory TA 55 SST Facility. CRADs provide a recommended approach and the types

  12. DOE - Office of Legacy Management -- TA-1 Manhattan Laboratory...

    Office of Legacy Management (LM)

    NM.11-1 - DOE MemorandumChecklist; Jones to File; Subject: Elimination Report - TA-1; October 29, 1985 NM.11-2 - Report; Status and Plans for Former Technical Area One at Los ...

  13. TA-53 UNREVIEWED SAFETY ISSUE SCREENING AND DETERMINATION PROCESS

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

    AND DETERMINATION PROCESS TRAINING WORKSHEET CT-TA53-FRM-505-R00 102011 Page 1 of 3 LA-UR-12-10162 TRAINEE NAME: Z NUMBER: GROUP: PURPOSE AND SCOPE: This worksheet is used to...

  14. CRAD, Configuration Management - Los Alamos National Laboratory TA 55 SST

    Office of Environmental Management (EM)

    Facility | Department of Energy

    Configuration Management - Los Alamos National Laboratory TA 55 SST Facility CRAD, Configuration Management - Los Alamos National Laboratory TA 55 SST Facility June 2005 A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Configuration Management program at

  15. Compositional depth profiling of TaCN thin films

    SciTech Connect (OSTI)

    Adelmann, Christoph; Conard, Thierry; Franquet, Alexis; Brijs, Bert; Munnik, Frans; Burgess, Simon; Witters, Thomas; Meersschaut, Johan; Kittl, Jorge A.; Vandervorst, Wilfried; Van Elshocht, Sven

    2012-07-15

    The composition profiling of thin TaCN films was studied. For the composition profile determination using x-ray photoemission spectrometry (XPS) in combination with Ar sputtering, preferential sputtering effects of N with respect to Ta and C were found to lead to inaccurate elemental concentrations. Sputter yield calculations for the given experimental conditions allowed for the correction of a part of the error, leading to fair accuracy by reference-free measurements. Further improvement of the accuracy was demonstrated by the calibration of the XPS compositions against elastic recoil detection analysis (ERDA) results. For Auger electron spectrometry (AES) in combination with Ar sputtering, accurate results required the calibration against ERDA. Both XPS and AES allowed for a reliable and accurate determination of the compositional profiles of TaCN-based thin films after calibration. Time-of-flight secondary-ion mass spectrometry was also used to assess the composition of the TaCN films. However, the analysis was hampered by large matrix effects due to small unintentional oxygen contents in the films. Energy-dispersive x-ray spectrometry is also discussed, and it is shown that an accurate reference-free measurement of the average film concentration can be achieved.

  16. CRAD, Maintenance- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Maintenance program at the Los Alamos National Laboratory TA 55 SST Facility.

  17. CRAD, Management- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Management at the Los Alamos National Laboratory TA 55 SST Facility.

  18. Issues for reuse of gloveboxes at LANL TA-55

    SciTech Connect (OSTI)

    Cadwallader, L.C.; Pinson, P.A.; Miller, C.F.

    1998-08-01

    This report is a summary of issues that face plutonium glovebox designers and users at the Los Alamos National Laboratory (LANL) Technical Area 55 (TA-55). Characterizing the issues is a step in the task of enhancing the next generation glovebox design to minimize waste streams while providing the other design functions. This report gives an initial assessment of eight important design and operation issues that can benefit from waste minimization.

  19. Facility Representative, Technical Area (TA-55) Plutonium Facility, Los

    National Nuclear Security Administration (NNSA)

    Alamos Site Office | National Nuclear Security Administration Facility Representative, Technical Area (TA-55) Plutonium Facility, Los Alamos Site Office John Krepps John Krepps June 2010 U.S. Department of Energy Facility Representative of the Year John Krepps, a facility representative for the National Nuclear Security Administration's (NNSA) Los Alamos Site Office, received the Department of Energy's top award for oversight of nuclear and non-nuclear facilities. Krepps, a Los Alamos

  20. Nucleation of fcc Ta when heating thin films

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Janish, Matthew T.; Mook, William M.; Carter, C. Barry

    2014-10-25

    Thin tantalum films have been studied during in-situ heating in a transmission electron microscope. Diffraction patterns from the as-deposited films were typical of amorphous materials. Crystalline grains were observed to form when the specimen was annealed in-situ at 450°C. Particular attention was addressed to the formation and growth of grains with the face-centered cubic (fcc) crystal structure. As a result, these observations are discussed in relation to prior work on the formation of fcc Ta by deformation and during thin film deposition.

  1. TaC Studios New Construction Test House

    SciTech Connect (OSTI)

    Butler, T.; Curtis, O.; Kim, E.; Roberts, S.; Stephenson, R.

    2013-03-01

    As part of the NAHB Research Center Industry Partnership, Southface partnered with TaC Studios, an Atlanta based architecture firm specializing in residential and light commercial design, on the construction of a new test home in Atlanta, GA, in the mixed humid climate zone. This home will serve as a model home for the builder partner and addresses Building America energy savings targets through the planning and implementation of a design package will serve as a basis of design for the builder partner’s future homes. As a BA test house, this home will be evaluated to detail whole house energy use, end use loads, and HVAC and hot water efficiency.

  2. TaC Studios New Construction Test House

    SciTech Connect (OSTI)

    Butler, T.; Curtis, O.; Kim, E.; Roberts, S.; Stephenson, R.

    2013-03-01

    As part of the NAHB Research Center Industry Partnership, Southface partnered with TaC Studios, an Atlanta based architecture firm specializing in residential and light commercial design, on the construction of a new test home in Atlanta, GA in the mixed humid climate zone. This home will serve as a model home for the builder partner and addresses Building America energy savings targets through the planning and implementation of a design package will serve as a basis of design for the builder partner's future homes. As a BA test house, this home will be evaluated to detail whole house energy use, end use loads, and HVAC and hot water efficiency.

  3. Magnetotransport measurements of current induced effective fields in Ta/CoFeB/MgO

    SciTech Connect (OSTI)

    Zhang, Chaoliang; Yamanouchi, Michihiko Ikeda, Shoji; Center for Spintronics Integrated Systems, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 ; Sato, Hideo; Fukami, Shunsuke; Matsukura, Fumihiro; Ohno, Hideo; Center for Spintronics Integrated Systems, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577; WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577

    2013-12-23

    We evaluate current-induced effective magnetic fields in perpendicularly magnetized Ta/CoFeB/MgO structures from the external magnetic field angle dependence of the Hall resistance. We confirm the presence of two components of effective fields. The dependence of their magnitudes on Ta thickness implies that both components are related to the spin current in Ta layer generated by the spin Hall effect.

  4. Magnetization reversal induced by in-plane current in Ta/CoFeB...

    Office of Scientific and Technical Information (OSTI)

    current are accordance with those for magnetization reversal by spin transfer torque originated from the spin Hall effect in the Ta layer. Authors: Zhang, C. 1 ;...

  5. NEPA REVIEW LASO-10-002 CATEGORICAL EXCLUSION PAJARITO ROAD RIGHT-OF-WAY SHIFT AT TA-50 AND TA-55

    National Nuclear Security Administration (NNSA)

    REVIEW LASO-10-002 CATEGORICAL EXCLUSION PAJARITO ROAD RIGHT-OF-WAY SHIFT AT TA-50 AND TA-55 1. DESCRIPTION OF PROPOSED ACTION: LANL proposes to shift a segment of Pajarito Road slightly to the south along the edge of Two-Mile Canyon in the vicinity of TA-55. The existing centerline would be moved between 36 feet and 56 feet depending on final designs. This shift would address the need to integrate security requirements related to the Chemistry and Metallurgy Building Replacement Project (CMRR)

  6. Preparation and performances of nanosized Ta{sub 2}O{sub 5} powder photocatalyst

    SciTech Connect (OSTI)

    Zhu Yongfa . E-mail: zhuyf@chem.tsinghua.edu.cn; Yu Fang; Man, Yi; Tian, Qingyong; He Yu; Wu Nianzu

    2005-01-15

    Nanosized-Ta{sub 2}O{sub 5} powder photocatalyst was successfully synthesized by using sol-gel method via TaCl{sub 5} butanol solution as a precursor. Ta{sub 2}O{sub 5} species can be formed under 500 deg. C via the decomposition of the precursor. The crystalline phase of Ta{sub 2}O{sub 5} powder photocatalyst can be obtained after being calcined above 600 deg. C for 4h. The crystal size and particle size of Ta{sub 2}O{sub 5} powder photocatalyst was about 50nm. A good photocatalytic performance for the degradation of gaseous formaldehyde was obtained for the nanosized-Ta{sub 2}O{sub 5} powder. The Ta{sub 2}O{sub 5} powder formed at 700 deg. C for 4h and at 650 deg. C for 12h showed the best performance. The calcination temperature and time play an important role in the crystallization and photocatalytical performance of nanosized-Ta{sub 2}O{sub 5} powder.

  7. Suboxide/subnitride formation on Ta masks during magnetic material etching by reactive plasmas

    SciTech Connect (OSTI)

    Li, Hu; Muraki, Yu; Karahashi, Kazuhiro; Hamaguchi, Satoshi

    2015-07-15

    Etching characteristics of tantalum (Ta) masks used in magnetoresistive random-access memory etching processes by carbon monoxide and ammonium (CO/NH{sub 3}) or methanol (CH{sub 3}OH) plasmas have been examined by mass-selected ion beam experiments with in-situ surface analyses. It has been suggested in earlier studies that etching of magnetic materials, i.e., Fe, Ni, Co, and their alloys, by such plasmas is mostly due to physical sputtering and etch selectivity of the process arises from etch resistance (i.e., low-sputtering yield) of the hard mask materials such as Ta. In this study, it is shown that, during Ta etching by energetic CO{sup +} or N{sup +} ions, suboxides or subnitrides are formed on the Ta surface, which reduces the apparent sputtering yield of Ta. It is also shown that the sputtering yield of Ta by energetic CO{sup +} or N{sup +} ions has a strong dependence on the angle of ion incidence, which suggests a correlation between the sputtering yield and the oxidation states of Ta in the suboxide or subnitride; the higher the oxidation state of Ta, the lower is the sputtering yield. These data account for the observed etch selectivity by CO/NH{sub 3} and CH{sub 3}OH plasmas.

  8. Electron Cloud at Low Emittance in CesrTA

    SciTech Connect (OSTI)

    Palmer, Mark; Alexander, James; Billing, Michael; Calvey, Joseph; Conolly, Christopher; Crittenden, James; Dobbins, John; Dugan, Gerald; Eggert, Nicholas; Fontes, Ernest; Forster, Michael; Gallagher, Richard; Gray, Steven; Greenwald, Shlomo; Hartill, Donald; Hopkins, Walter; Kreinick, David; Kreis, Benjamin; Leong, Zhidong; Li, Yulin; Liu, Xianghong; /more authors..

    2012-07-06

    The Cornell Electron Storage Ring (CESR) has been reconfigured as a test accelerator (CesrTA) for a program of electron cloud (EC) research at ultra low emittance. The instrumentation in the ring has been upgraded with local diagnostics for measurement of cloud density and with improved beam diagnostics for the characterization of both the low emittance performance and the beam dynamics of high intensity bunch trains interacting with the cloud. A range of EC mitigation methods have been deployed and tested and their effectiveness is discussed. Measurements of the electron cloud's effect on the beam under a range of conditions are discussed along with the simulations being used to quantitatively understand these results.

  9. Chemical Concentrations in Field Mice from Open-Detonation Firing Sites TA-36 Minie and TA-39 Point 6 at Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Fresquez, Philip R.

    2011-01-01

    Field mice (mostly Peromyscus spp.) were collected at two open-detonation (high explosive) firing sites - Minie at Technical Area (TA) 36 and Point 6 at TA-39 - at Los Alamos National Laboratory in August of 2010 and in February of 2011 for chemical analysis. Samples of whole body field mice from both sites were analyzed for target analyte list elements (mostly metals), dioxin/furans, polychlorinated biphenyl congeners, high explosives, and perchlorate. In addition, uranium isotopes were analyzed in a composite sample collected from TA-36 Minie. In general, all constituents, with the exception of lead at TA-39 Point 6, in whole body field mice samples collected from these two open-detonation firing sites were either not detected or they were detected below regional statistical reference levels (99% confidence level), biota dose screening levels, and/or soil ecological chemical screening levels. The amount of lead in field mice tissue collected from TA-39 Point 6 was higher than regional background, and some lead levels in the soil were higher than the ecological screening level for the field mouse; however, these levels are not expected to affect the viability of the populations over the site as a whole.

  10. Structural and compositional variations in Ta{sub 3}N{sub 5} produced by

    Office of Scientific and Technical Information (OSTI)

    high-temperature ammonolysis of tantalum oxide (Journal Article) | SciTech Connect Journal Article: Structural and compositional variations in Ta{sub 3}N{sub 5} produced by high-temperature ammonolysis of tantalum oxide Citation Details In-Document Search Title: Structural and compositional variations in Ta{sub 3}N{sub 5} produced by high-temperature ammonolysis of tantalum oxide A series of samples of Ta{sub 3}N{sub 5} (Cmcm, a=3.89A, b=10.22A, c=10.28A) have been produced by

  11. Preparation of W-Ta thin-film thermocouple on diamond anvil cell for

    Office of Scientific and Technical Information (OSTI)

    in-situ temperature measurement under high pressure (Journal Article) | SciTech Connect Preparation of W-Ta thin-film thermocouple on diamond anvil cell for in-situ temperature measurement under high pressure Citation Details In-Document Search Title: Preparation of W-Ta thin-film thermocouple on diamond anvil cell for in-situ temperature measurement under high pressure In this paper, a W-Ta thin-film thermocouple has been integrated on a diamond anvil cell by thin-film deposition and

  12. Influence of shockwave obliquity on deformation twin formation in Ta

    SciTech Connect (OSTI)

    Gray, George T., III; Livescu, V; Cerreta, E K; Mason, T A; Maudlin, P J; Bingert, J F

    2009-02-18

    Energetic loading subjects a material to a 'Taylor wave' (triangular wave) loading profile that experiences an evolving balance of hydrostatic (spherical) and deviatoric stresses. While much has been learned over the past five decades concerning the propensity of deformation twinning in samples shockloaded using 'square-topped' profiles as a function of peak stress, achieved most commonly via flyer plate loading, less is known concerning twinning propensity during non-I-dimensional sweeping detonation wave loading. Systematic small-scale energetically-driven shock loading experiments were conducted on Ta samples shock loaded with PEFN that was edge detonated. Deformation twinning was quantified in post-mortem samples as a function of detonation geometry and radial position. In the edge detonated loading geometry examined in this paper, the average volume fraction of deformation twins was observed to drastically increase with increasing shock obliquity. The results of this study are discussed in light of the formation mechanisms of deformation twins, previous literature studies of twinning in shocked materials, and modeling of the effects of shock obliquity on the evolution of the stress tensor during shock loading.

  13. Precision dilatometry of Nb, Ta, and Lu tritides

    SciTech Connect (OSTI)

    Schober, T.; Dieker, C.; Lasser, R.; Trinkaus, H.

    1989-07-15

    Applying buoyancy dilatometry at room temperature toNbT/sub 0.0253/ and strain-gauge dilatometry at roomtemperature and 78 K to TaT/sub 0.0744/ andLuT/sub 0.15/, respectively, we have measured the swelling ofthese tritides due to the transmutation of T to /sup 3/He in the firsttwo years after T charging. For all three tritides almost linear swelling isfound, indicating approximately constant /sup 3/He densities inbubbles. The corresponding values for the volume requirement of a/sup 3/He atom in a bubble are around 8 A/sup 3/.Associated pressure values are derived with the aid of an equation of state for/sup 3/He adapted to recent high-pressure x-ray-diffractionmeasurements on solid /sup 4/He. With increasing /sup 3/Heconcentration the pressure seems to converge to about 0.2 of the shear modulusof the metal, in accordance with recent theoretical results concerning thethreshold pressure for dislocation-loop punching by bubbles.

  14. EP-AREAG-PLAN-1248, R.0 TA-54 Area G Nitrate-Salt Waste Container...

    Office of Environmental Management (EM)

    EP-AREAG-PLAN-1248, R.0 TA-54 Area G Nitrate-Salt Waste Container Response Instructions Effective Date: 5282014 The Responsible Manager has determined that the following...

  15. [Inspection of gas cylinders in storage at TA-54, Area L]. Volume 2, Final report

    SciTech Connect (OSTI)

    1994-06-23

    ERC sampled, analyzed, and rcontainerized when necessary gas cylinders containing various chemicals in storage at LANL TA-54 Area L. This report summarizes the operation. This is Volume 2 of five volumes.

  16. Optical spectroscopy of the Weyl semimetal TaAs (Technical Report) |

    Office of Scientific and Technical Information (OSTI)

    SciTech Connect Optical spectroscopy of the Weyl semimetal TaAs Citation Details In-Document Search Title: Optical spectroscopy of the Weyl semimetal TaAs This report discusses findings from a study on transition-metal monoarsenides. Authors: Dai, Yaomin [1] ; Taylor, Antoinette Jane [1] ; Yarotski, Dmitry Anatolievitch [1] ; Prasankumar, Rohit Prativadi [1] ; Xu, Bing [2] ; Zhao, Lingxiao [2] ; Wang, Kai [2] ; Yang, Run [2] ; Zhang, Wei [2] ; Liu, Jinyun [2] ; Xiao, Hong [2] ; Chen, Genfu

  17. Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities

    Office of Environmental Management (EM)

    Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities Jim Dahl Manager, Nuclear Safety Analysis Sandia National Laboratories Office: 505-284-9067 Email: jjdahl@sandia.gov SAND2012-4478P Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. 2 Dispersion and Consequence Analysis at Sandia's TA-V Topics: * Site

  18. RECOMMENDATION FOR DISPOSITION OF REMOTE-HANDLED WASTE BURIED IN 33 SHAFTS AT TA-54

    Office of Environmental Management (EM)

    0-01 Approved by the NNMCAB on January 27, 2010 NORTHERN NEW MEXICO CITIZENS' ADVISORY BOARD (NNMCAB) Waste Management Committee Recommendation to the Department of Energy No. 2010-01 Recommendation for Disposition of Remote-handled Waste Buried in 33 Shafts at Technical Area 54 (TA-54) Background The Consent Order between the State of New Mexico, the Department of Energy/National Nuclear Safety Administration (DOE/NNSA) and Los Alamos National Security (LANS) requires that TA-54 Material

  19. Growth of single crystalline TaON on yttria-stabilized zirconia (YSZ)

    SciTech Connect (OSTI)

    Tao, Junguang Chai, J.W.; Wong, L.M.; Zhang, Z.; Pan, J.S.; Wang, S.J.

    2013-08-15

    Owing to its high stability in aqueous solution and high quantum efficiency, tantalum based oxyntride (TaON) has attracted increasing attentions for application as visible light photocatalyst. However, despite the recent progress in photocatalytic studies, its bulk charge transport mechanisms are yet to be discovered because of the lack of single crystal sample. In this paper, high quality single crystalline TaON(100) thin film was prepared on cubic YSZ(100) surface by reactive RF magnetron sputtering to avail the understandings of charge transport mechanism so as to improve the device efficiency. The stoichiometry, crystal phase and structure were examined in situ by x-ray photoelectron spectroscopy (XPS) and ex situ by x-ray diffraction (XRD) and transmission electron microscopy (TEM). The TaON film crystallizes in monoclinic ?-phase with its [010]/[001] directions aligned to those of the substrate. The small band gap of 2.5 eV as well as the high structure perfection suggests better performance for visible light water splitting. The method can be used to prepare other surface orientations to elucidate fundamental surface structure dependent photoactivities. - Graphical abstract: Structure of single crystalline ?-TaON and its diffraction pole figure. Highlights: High quality single crystal TaON(100) thin film were grown on YSZ(100) surface. ?-phase monoclinic TaON film is formed. Its [010]/[001] directions are aligned to those of the substrate. The small band gap and structure perfection suggest visible light photo-activity.

  20. Precessional magnetization induced spin current from CoFeB into Ta

    SciTech Connect (OSTI)

    Jamali, Mahdi; Klemm, Angeline; Wang, Jian-Ping

    2013-12-16

    The spin dynamics at the interface between the CoFeB and Ta layer has been studied using spin pumping and spin wave characterizations. The spin pumping driven by the ferromagnetic resonance in the CoFeB layer injects a spin current into Ta layer which results in an electromotive force across the Ta layer due to the inverse spin Hall effect. Upon changing the polarity of the bias magnetic field, the polarity of the output voltage inverts and the output voltage increases linearly in respect to the microwave signal power which are consistent with the spin pumping characteristics. The effect of the in-plane magnetization angle on the output voltage has been studied. Furthermore, it is found that the frequency spectrum of the spin Hall voltage is modified by the annealing temperature and the full width at half maximum of the spin pumping increases by more than 40% with the increase of the annealing temperature from 200 °C to 300 °C. The spin Hall angle at the Ta-CoFeB interface is determined to be 0.014, and the damping constant of the CoFeB increases from 0.006 in pure CoFeB to 0.015 in Ta/CoFeB film.

  1. Effects of annealing on antiwear and antibacteria behaviors of TaN-Cu nanocomposite thin films

    SciTech Connect (OSTI)

    Hsieh, J. H.; Cheng, M. K.; Chang, Y. K.; Li, C.; Chang, C. L.; Liu, P. C.

    2008-07-15

    TaN-Cu nanocomposite films were deposited by reactive cosputtering on Si and tool steel substrates. The films were then annealed using rapid thermal annealing (RTA) at 400 deg. C for 2, 4, and 8 min, respectively, to induce the nucleation and growth of Cu particles in TaN matrix and on film surface. Field emission scanning electron microscopy was applied to characterize Cu nanoparticles emerged on the surface of TaN-Cu thin films. The effects of annealing on the antiwear and antibacterial properties of these films were studied. The results reveal that annealing by RTA can cause Cu nanoparticles to form on the TaN surface. Consequently, the tribological behaviors, as well as the antibacterial behavior may vary depending on particle size, particle distribution, and total exposed Cu amount. For the samples with large Cu particles, the reduction of averaged friction and wear rate is obvious. Apparently, it is due to the smeared Cu particles adhered onto the wear tracks. This Cu layer may act as a solid lubricant. From the antibacterial testing results, it is found that both Cu particle size and total exposed Cu amount are critical in making short-term antibacterial effect. Overall, all the annealed TaN-Cu samples can reach >99% antibacterial efficiency in 24 h, with respect to uncoated Si substrate.

  2. CRAD, Occupational Safety & Health- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Industrial Hygiene program at the Los Alamos National Laboratory TA 55 SST Facility.

  3. CRAD, Conduct of Operations- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Conduct of Operations program at the Los Alamos National Laboratory, TA 55 SST Facility.

  4. CRAD, Safety Basis- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Safety Basis at the Los Alamos National Laboratory TA 55 SST Facility.

  5. TA-55 Final Safety Analysis Report Comparison Document and DOE Safety Evaluation Report Requirements

    SciTech Connect (OSTI)

    Alan Bond

    2001-04-01

    This document provides an overview of changes to the currently approved TA-55 Final Safety Analysis Report (FSAR) that are included in the upgraded FSAR. The DOE Safety Evaluation Report (SER) requirements that are incorporated into the upgraded FSAR are briefly discussed to provide the starting point in the FSAR with respect to the SER requirements.

  6. High-pressure shock behavior of WC and Ta2O5 powders.

    SciTech Connect (OSTI)

    Knudson, Marcus D. (Sandia National Laboratories, Albuquerque, NM); Reinhart, William Dodd (Sandia National Laboratories, Albuquerque, NM); Vogler, Tracy John; Root, Seth (Sandia National Laboratories, Albuquerque, NM)

    2011-10-01

    Planar shock experiments were conducted on granular tungsten carbide (WC) and tantalum oxide (Ta{sub 2}O{sub 5}) using the Z machine and a 2-stage gas gun. Additional shock experiments were also conducted on a nearly fully dense form of Ta{sub 2}O{sub 5}. The experiments on WC yield some of the highest pressure results for granular materials obtained to date. Because of the high distention of Ta{sub 2}O{sub 5}, the pressures obtained were significantly lower, but the very high temperatures generated led to large contributions of thermal energy to the material response. These experiments demonstrate that the Z machine can be used to obtain accurate shock data on granular materials. The data on Ta{sub 2}O{sub 5} were utilized in making improvements to the P-{lambda} model for high pressures; the model is found to capture the results not only of the Z and gas gun experiments but also those from laser experiments on low density aerogels. The results are also used to illustrate an approach for generating an equation of state using only the limited data coming from nanoindentation. Although the EOS generated in this manner is rather simplistic, for this material it gives reasonably good results.

  7. CRAD, Criticality Safety- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Criticality Safety program at the Los Alamos National Laboratory, TA 55 SST Facility.

  8. CRAD, Radiological Controls- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Radiation Protection Program at the Los Alamos National Laboratory TA 55 SST Facility.

  9. CRAD, Quality Assurance- Los Alamos National Laboratory TA 55 SST Facility

    Broader source: Energy.gov [DOE]

    A section of Appendix C to DOE G 226.1-2 "Federal Line Management Oversight of Department of Energy Nuclear Facilities." Consists of Criteria Review and Approach Documents (CRADs) used for an assessment of the Quality Assurance Program at the Los Alamos National Laboratory TA 55 SST Facility.

  10. Landslides and other mass movements near TA-33, northern White Rock Canyon, New Mexico. Final report

    SciTech Connect (OSTI)

    Dethier, D.P.

    1993-09-01

    Massive slump complexes and at least two rock avalanches flank the eastern rim of the Pajarito Plateau along northern White Rock Canyon, north of TA-33. Landslides failed along mechanically weak rocks in the Santa Fe Group, within the Puye Formation, or in Pliocene alluvial and lacustrine units. The landslides are mainly of early or middle Pleistocene age. The toe area of at least,one slump complex has been active in the late Pleistocene, damming White Rock Canyon near the mouth of Water Canyon. Lacustrine sediment that filled this lake, or series of lakes, to an elevation of at least 1710 m is preserved at a number of upstream sites, including a deposit near the Buckman townsite that exposes 30 m of lacustrine sediment. Charcoal collected at several sites has been submitted for {sup 14}C dating. Landslides, however, probably do not represent a significant short-term threat to the material disposal areas at TA-33. Bedrock that lies beneath the TA-33 mesa is relatively stable, the mesa shows no signs of incipient failure, and past periods of slide activity were responses to rapid downcutting of the Rio Grande and climate change, probably over periods of several decades, at least. Rockfall and headward erosion of gullies do not represent significant decadal hazards on canyon rims near TA-33. Gully migration near MDA-K is a potential threat, but the gullies were not examined in detail. A system of north-trending faults, at least one of which displays Pleistocene activity, bisects the TA-33 mesa. If these faults are capable of producing significant seismic shaking, generalizations about landslide and rockfall hazards must be reevaluated.

  11. The Use of TaBoRR as a Heavy Oil Upgrader

    SciTech Connect (OSTI)

    Lee Brecher; Charles Mones

    2009-02-05

    Preliminary testing has shown that Western Research Institute's (WRI) Tank Bottom Recovery and Remediation (TaBoRR{reg_sign}) technology shows promise for heavy oil upgrading. Approximately 70 to 75 wt% of a Canadian Cold Lake bitumen feed was converted to a partially upgraded overhead product that could be transported directly by pipeline or blended with the parent bitumen to produce transportable crude. TaBoRR{reg_sign} was originally developed to remediate tank bottom wastes by producing a distillate product and solid waste. TaBoRR{reg_sign}'s processing steps include breaking a water-oil emulsion, recovering a light hydrocarbon fraction by distillation in a stripper unit, and pyrolyzing the residua reducing it to additional overhead and a benign coke for disposal. Cold Lake bitumen was tested in WRI's bench-scale equipment to evaluate the potential use of TaBoRR{reg_sign} technology for heavy oil upgrading to produce a stable, partially (or fully) upgraded product that will allow diluent-reduced or diluent-free transportation of bitumen or ultra-heavy crudes to market. Runs were conducted at temperatures of low, intermediate and high severity in the stripper to produce stripper overhead and bottoms. The bottoms from each of these runs were processed further in a 6-inch screw pyrolyzer to produce pyrolyzer overhead for blending with the corresponding stripper overheads. Proceeding in this fashion yielded three partially upgraded crudes. The products from TaBoRR{reg_sign} processing, the parent bitumen, and bitumen blends were subjected to stability and compatibility testing at the National Centre for Upgrading Technology (NCUT). Chemical analyses of the overhead product blends have met pipeline specifications for viscosity and density; however the bromine number does not, which might indicate the need for mild hydrotreating. Storage stability tests showed the blends to be stable. The blends were also soluble and compatible with most other Alberta crudes.

  12. Electronic and optical properties of TaO{sub 1-x}N{sub 1+x}-based alloys

    SciTech Connect (OSTI)

    Al-Aqtash, Nabil; Apostol, Florin; Mei, Wai-Ning; Sabirianov, Renat F.; Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588

    2013-02-15

    TaON is considered as a potential candidate as a visible-light responsive photocatalyst. We report the results of ab initio studies of electronic structure of TaON-based alloys. Specifically, we show that the position of conduction and valence band can be modified by varying the oxygen and nitrogen concentrations in TaO{sub 1-x}N{sub 1+x}. We find that the band gap decreases monotonically with the increase of N/O ratio. The band gap energy is decreased in monoclinic TaON from near 2.3 eV to just over 1.7 eV (i.e., by 35%) when N/O ratio is increased from 3/5 to 5/3. Our calculations show that the band gap reduces in a series of experimentally fabricated alloys ZrTa{sub 3}O{sub 5}N{sub 3}{yields}TaON{yields}YTa{sub 7}O{sub 7}N{sub 8}. The band gap reduction is mostly associated with the change in the position of the valence band due to the hybridization of N 2p states, while the conduction band consisting mostly of Ta 5d-states is not sensitive to N content. The calculated optical absorption spectra show reduction in the optical band gap with increasing N/O ratio. - Graphical abstract: Band gap energy of TaO{sub 1-x}N{sub 1+x} as a function of N/O ratio. Highlights: Black-Right-Pointing-Pointer The electronic and optical properties of TaON-based alloys are studied using DFT. Black-Right-Pointing-Pointer The position of conduction and valence bands can be modified by varying N/O ratio. Black-Right-Pointing-Pointer The band gap decreases monotonically with the increase of N/O ratio in TaO{sub 1-x}N{sub 1+x}. Black-Right-Pointing-Pointer The band gap reduces in a series of fabricated alloys ZrTa{sub 3}O{sub 5}N{sub 3}{yields}TaON{yields}YTa{sub 7}O{sub 7}N{sub 8}. Black-Right-Pointing-Pointer The optical band gap decreases with the increase of N/O ratio.

  13. Multiband Te p Based Superconductivity of Ta4Pd3Te16

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Singh, David J.

    2014-10-06

    We recently discovered that Ta4Pd3Te16 is a superconductor that has been suggested to be an unconventional superconductor near magnetism. Here, we report electronic structure calculations showing that despite the layered crystal structure the material is an anisotropic three-dimensional (3D) metal. The Fermi surface contains prominent one-dimensional (1D) and two-dimensional (2D) features, including nested 1D sheets, a 2D cylindrical section, and a 3D sheet. Moreover, the electronic states that make up the Fermi surface are mostly derived from Te p states with small Ta d and Pd d contributions. This places the compound far from magnetic instabilities. The results are discussedmore » in terms of multiband superconductivity.« less

  14. Competing decay modes of a high-spin isomer in the proton-unbound nucleus ??Ta*

    SciTech Connect (OSTI)

    Carroll, R. J.; Page, R. D.; Joss, D. T.; Uusitalo, J.; Darby, I. G.; Andgren, K.; Cederwall, B.; Eeckhaudt, S.; Grahn, T.; Gray-Jones, C.; Greenlees, P. T.; Hadinia, B.; Jones, P. M.; Julin, R.; Juutinen, S.; Leino, M.; Leppnen, A. -P.; Nyman, M.; O'Donnell, D.; Pakarinen, J.; Rahkila, P.; Sandzelius, M.; Sarn, J.; Scholey, C.; Seweryniak, D.; Simpson, J.

    2015-01-01

    An isomeric state at high spin and excitation energy was recently observed in the proton-unbound nucleus 158Ta. This state was observed to decay by both ? and ? decay modes. The large spin change required to decay via ?-ray emission incurs a lifetime long enough for ? decay to compete. The ? decay has an energy of 8644(11) keV, which is among the highest observed in the region, a partial half-life of 440(70) ?s and changes the spin by 11?. In this study, additional evidence supporting the assignment of this ? decay to the high-spin isomer in 158Ta will be presented.

  15. Preliminary results for HIP bonding Ta to W targets for the materials test station

    SciTech Connect (OSTI)

    Dombrowski, David E; Maloy, Stuart A

    2009-01-01

    Tungsten targets for the Materials Test Station (MTS) were clad with thin tantalum cover plates and a tantalum frame using hot isostatic pressing (HIP). A preliminary HIP parameter study showed good bonding and intimate mechanical contact for Ta cover plate thicknesses of 0.25 mm (0.010 inch) and 0.38 mm (0.015 inch). HIP temperatures of full HIP runs were 1500 C (2732 F). HIP pressure was 203 MPa (30 ksi).

  16. Isothermal oxidation behavior and microstructure of plasma surface Ta coating on ?-TiAl

    SciTech Connect (OSTI)

    Song, Jian; Zhang, Ping-Ze Wei, Dong-Bo; Wei, Xiang-Fei; Wang, Ya

    2014-12-15

    The oxidation behavior of ?-TiAl with Ta surface coating fabricated by double glow plasma surface alloying technology was investigated by thermogravimetric method. Oxidation experiments were carried out at 750 C and 850 C in air for 100 h. The modification layer was comprised of deposition layer and diffusion layer, which metallurgically adhered to the substrate. Tantalum element decreased with the case depth. The oxidation morphology was studied by a scanning electron microscope and X-ray diffraction. The results highlighted that in the oxidizing process of the oxidation, the phase containing Ta-richer may restrain diffusing outward of the element Al in the matrix. Ti diffused outward, and formed the TiO{sub 2} scales, while the middle layer was rich in Al, and formed the continuous Al{sub 2}O{sub 3} scales after oxidation, which was effective to prevent further infiltration of oxygen atoms, and as a result the oxidation resistance increased immensely. - Highlights: A Ta modified coating was prepared on ?-TiAl using DGP surface alloying technology. The modification layer metallurgically adhered to the substrate. The bonding force is about 60 N, satisfying the demands of practical use. The oxidation resistance increased immensely at 750 C and 850 C.

  17. NERC-LV-539-1 EBVfRONl4EfjTA.L MONITORING REPORT FOR TRE NEVADA...

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

    EBVfRONl4EfjTA.L MONITORING REPORT FOR TRE NEVADA TEST SITE January-December 1971 * .. ... MONITORING REPORT FOR THE NEVADA TEST SITE January-December 1971 by the National ...

  18. Structure, magnetism, specific heat, and dielectric properties of Eu{sub 2}Ta{sub 2}O{sub 7}

    SciTech Connect (OSTI)

    Kolodiazhnyi, T. Sakurai, H.; Matsushita, Y.

    2014-11-17

    Polycrystalline Eu{sub 2}Ta{sub 2}O{sub 7} containing layered perovskite slabs was prepared and analyzed. Eu{sub 2}Ta{sub 2}O{sub 7} crystallizes in the orthorhombic centrosymmetric Cmcm space group (with unit cell: a?=?3.95156(9), b?=?27.0775(6), and c?=?5.68279(13) ) isomorphous with high-temperature Sr{sub 2}Ta{sub 2}O{sub 7}. Dielectric measurements reveal that, in contrast to Sr{sub 2}Ta{sub 2}O{sub 7} which is ferroelectric below 166?K, Eu{sub 2}Ta{sub 2}O{sub 7} remains paraelectric down to at least 0.45?K and shows no magneto-dielectric coupling. Magnetic data in the 2400?K range indicate an antiferromagnetic phase transition with a sharp susceptibility peak at 2.71(5) K. Further analysis using specific heat measurements reveals that the second magnetic phase transition occurs at 1.10(5) K and dominates the spin entropy of the Eu{sup 2+} 4f{sup 7} ions. The possible origin of the two successive magnetic phase transitions in Eu{sub 2}Ta{sub 2}O{sub 7} requires further studies.

  19. Seismic Vulnerability Assessment Waste Characterization Reduction and Repackaging Building, TA-50-69

    SciTech Connect (OSTI)

    M.W.Sullivan; J.Ruminer; I.Cuesta

    2003-02-02

    This report presents the results of the seismic structural analyses completed on the Waste Characterization Reduction and Repackaging (WCRR) Building in support of ongoing safety analyses. WCRR is designated as TA-50-69 at Los Alamos National Laboratory, Los Alamos, New Mexico. The facility has been evaluated against Department of Energy (DOE) seismic criteria for Natural Phenomena Hazards (NPH) Performance Category II (PC 2). The seismic capacities of two subsystems within the WCRR building, the material handling glove box and the lift rack immediately adjacent to the Glove Box are also documented, and the results are presented.

  20. Observation of surface to bulk interatomic Auger decay from Ta(100)

    SciTech Connect (OSTI)

    Jensen, E. ); Bartynski, R.A. ); Weinert, M. ); Hulbert, S.L.; Johnson, E.D.; Garrett, R.F. )

    1990-06-15

    Core-valence-valence ({ital CVV}) Auger spectra from Ta(100) taken in coincidence with bulk and surface-shifted 4{ital f}{sub 7/2} core-level emission are presented. These data are compared with self-convolutions of calculations of the {ital d}-band densities of states for the surface and subsurface layers of a nine-layer slab. Agreement of the bulk spectrum with the calculation is good; agreement for the surface spectrum is very poor. These data are explained by proposing an interatomic surface to bulk Auger decay mode for the surface core hole that is competitive with the conventional {ital CVV} decay process.

  1. Multiband semimetallic electronic structure of superconducting Ta2PdSe5

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Singh, David Joseph

    2015-04-24

    We report the electronic structure and related properties of the superconductor Ta2PdSe5 as determined from density functional calculations. The Fermi surface has two disconnected sheets, both derived from bands of primarily chalcogenide p states. These are a corrugated hole cylinder and a heavier complex shaped electron sheet. The sheets contain 0.048 holes and a compensating number of electrons per formula unit, making the material a semimetallic superconductor. The results support the presence of two band superconductivity, although a discrepancy in the specific heat is noted. This discrepancy is discussed as a possible consequence of Pd deficiency in samples.

  2. Water Resistant Container Technical Basis Document for the TA-55 Criticality Safety Program

    SciTech Connect (OSTI)

    Smith, Paul Herrick; Teague, Jonathan Gayle

    2015-04-30

    Criticality safety at TA-55 relies on nuclear material containers that are water resistant to prevent significant amounts of water from coming into contact with fissile material in the event of a fire that causes a breach of glovevbox confinement and subsequent fire water ingress. A “water tight container” is a container that will not allow more than 50ml of water ingress when fully submerged, except when under sufficient pressure to produce structural discontinuity. There are many types of containers, welded containers, hermetically sealed containers, filtered containers, etc.

  3. 3AK RIDGE NATIONAL LABORATORY OPERAiEO BY MARTIN MARIE,TA ENERGY SYSTEMS, INC.

    Office of Legacy Management (LM)

    .I Y. ,J,.- i - 3AK RIDGE NATIONAL LABORATORY OPERAiEO BY MARTIN MARIE,TA ENERGY SYSTEMS, INC. POST OFFICE BOX X OAK RIOGE. TENNESSEE 37631 July 20, 1984 Ms. Gale P. Turi Division of Remedial Action Projects Office of Nuclear Energy U.S. Department of Energy MS - NE24 Washington, D.C. 20545 Dear Ms. Turi: Radfoloafcal Survey of the Guterl Steel Fad1 ftya 1 o&a As requested, a visit was made to the Guterl Steel facility (formerly Simonds Saw and Steel) on July 9, 1984 to determine if there

  4. Magnetization reversal induced by in-plane current in Ta/CoFeB/MgO structures with perpendicular magnetic easy axis

    SciTech Connect (OSTI)

    Zhang, C.; Yamanouchi, M. Ikeda, S.; Sato, H.; Fukami, S.; Matsukura, F.; Ohno, H.

    2014-05-07

    We investigate in-plane current-induced magnetization reversal under an in-plane magnetic field in Hall bar shaped devices composed of Ta/CoFeB/MgO structures with perpendicular magnetic easy axis. The observed relationship between the directions of current and magnetization switching and Ta thickness dependence of magnetization switching current are accordance with those for magnetization reversal by spin transfer torque originated from the spin Hall effect in the Ta layer.

  5. Preparation, characterization of the Ta-doped ZnO nanoparticles and their photocatalytic activity under visible-light illumination

    SciTech Connect (OSTI)

    Kong Jizhou; Li Aidong; Zhai Haifa; Gong Youpin; Li Hui; Wu Di

    2009-08-15

    This paper describes a novel catalyst of the Ta-doped ZnO nanocrystals prepared by a modified polymerizable complex method using the water-soluble tantalum precursor as the sources of Ta. The catalysts were characterized by means of various analytical techniques as a function of Ta content (x=0-4 mol%) systematically. A remarkable advantage of the results was confirmed that dopant Ta enhanced the visible-light absorption of ZnO and the low-solubility tantalum doping could restrain the growth of crystal and minish the particle size. The relationship between the physicochemical property and the photocatalytic performance was discussed, and it was found that the photocatalytic activity in the photochemical degradation of methylene blue under visible-light irradiation (lambda>=420 nm) was dependent on the contents of the dopant, which could affect the particle size, concentration of surface hydroxyl groups and active hydrogen-related defect sites, and the visible-light absorption. The highest photocatalytic activity was obtained for the 1.0 mol% Ta-doped ZnO sample. - Graphical abstract: The addition of the tantalum into ZnO prepared by a modified polymerizable complex method not only restrains the growth of crystal, minish the particle size, but also changes the nanocrystal morphology.

  6. Dependence of inverse-spin Hall effect and spin-rectified voltage on tantalum thickness in Ta/CoFeB bilayer structure

    SciTech Connect (OSTI)

    Kim, Sang-Il; Seo, Min-Su; Park, Seung-Young; Kim, Dong-Jun; Park, Byong-Guk

    2015-01-19

    Ta-layer thickness (t{sub Ta}) dependence of the measured DC voltage V from the inverse-spin Hall effect (ISHE) in Ta/CoFeB bilayer structure is experimentally investigated using the ferromagnetic resonance in the TE{sub 011} resonant cavity. The ISHE signals excluding the spin-rectified effect (SRE) were separated from the fitted curve of V against t{sub Ta}. For t{sub Ta} ≈ λ{sub Ta} (Ta-spin diffusion length = 2.7 nm), the deviation in ISHE voltage V{sub ISH} between the experimental and theoretical values is significantly increased because of the large SRE contribution, which also results in a large deviation in the spin Hall angle θ{sub SH} (from 10% to 40%). However, when t{sub Ta} ≫ λ{sub Ta}, the V{sub ISH} values are consistent with theoretical values because the SRE terms become negligible, which subsequently improves the accuracy of the obtained θ{sub SH} within 4% deviation. The results will provide an outline for an accurate estimation of the θ{sub SH} for materials with small λ value, which would be useful for utilizing the spin Hall effect in a 3-terminal spintronic devices in which magnetization can be controlled by in-plane current.

  7. Synthesis and magnetic properties of Ta/NdFeB-based composite microwires

    SciTech Connect (OSTI)

    Szary, P. Prigo, E. A.; Michels, A.; Luciu, I.; Duday, D.; Wirtz, T.; Choquet, P.

    2015-05-07

    Magnetic NdFeB-based microwire composites have been prepared by the direct current magnetron sputtering technique in a specifically designed sputtering chamber for thin-film deposition in wire geometry. As substrate wire material, we have employed steel and Ta. Annealing of the substrate wires during the deposition process was performed by ohmic heating through the application of a direct current. Samples were characterized by means of vibrating sample magnetometry (VSM) and scanning electron microscopy. Best properties have been encountered when using Ta wires as core (substrate) material. The VSM data show a dramatic impact of the current applied during the deposition process on the magnetic properties. For higher current values, i.e., higher annealing temperatures, the wires exhibit a reversal process that is typical for a two-phase system. Moreover, an increase of the coercive field (and remanent magnetization) is observed, which is ascribed to a modification of the magnetic phase present in the sample due to the annealing. We find an indication for the formation of a magnetic easy-axis direction which is azimuthally oriented around the wire axis.

  8. Charge trapping of Ge-nanocrystals embedded in TaZrO{sub x} dielectric films

    SciTech Connect (OSTI)

    Lehninger, D. Seidel, P.; Geyer, M.; Schneider, F.; Heitmann, J.; Klemm, V.; Rafaja, D.; Borany, J. von

    2015-01-12

    Ge-nanocrystals (NCs) were synthesized in amorphous TaZrO{sub x} by thermal annealing of co-sputtered Ge-TaZrO{sub x} layers. Formation of spherical shaped Ge-NCs with small variation of size, areal density, and depth distribution was confirmed by high-resolution transmission electron microscopy. The charge storage characteristics of the Ge-NCs were investigated by capacitance-voltage and constant-capacity measurements using metal-insulator-semiconductor structures. Samples with Ge-NCs exhibit a maximum memory window of 5 V by sweeping the bias voltage from −7 V to 7 V and back. Below this maximum, the width of the memory window can be controlled by the bias voltage. The fitted slope of the memory window versus bias voltage characteristics is very close to 1 for samples with one layer Ge-NCs. A second layer Ge-NCs does not result in a second flat stair in the memory window characteristics. Constant-capacity measurements indicate charge storage in trapping centers at the interfaces between the Ge-NCs and the surrounding materials (amorphous matrix/tunneling oxide). Charge loss occurs by thermal detrapping and subsequent band-to-band tunneling. Reference samples without Ge-NCs do not show any memory window.

  9. High Nb, Ta, and Al creep- and oxidation-resistant austenitic stainless steel

    DOE Patents [OSTI]

    Brady, Michael P [Oak Ridge, TN; Santella, Michael L [Knoxville, TN; Yamamoto, Yukinori [Oak Ridge, TN; Liu, Chain-tsuan [Oak Ridge, TN

    2010-07-13

    An austenitic stainless steel HTUPS alloy includes, in weight percent: 15 to 30 Ni; 10 to 15 Cr; 2 to 5 Al; 0.6 to 5 total of at least one of Nb and Ta; no more than 0.3 of combined Ti+V; up to 3 Mo; up to 3 Co; up to 1 W; up to 0.5 Cu; up to 4 Mn; up to 1 Si; 0.05 to 0.15 C; up to 0.15 B; up to 0.05 P; up to 1 total of at least one of Y, La, Ce, Hf, and Zr; less than 0.05 N; and base Fe, wherein the weight percent Fe is greater than the weight percent Ni wherein said alloy forms an external continuous scale comprising alumina, nanometer scale sized particles distributed throughout the microstructure, said particles comprising at least one composition selected from the group consisting of NbC and TaC, and a stable essentially single phase fcc austenitic matrix microstructure, said austenitic matrix being essentially delta-ferrite-free and essentially BCC-phase-free.

  10. Polytypism, polymorphism, and superconductivity in TaSe2-xTex

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Luo, Huixia; Tao, Jing; Xie, Weiwei; Inoue, Hiroyuki; Gyenis, Andras; Krizan, Jason W.; Yazdani, Ali; Zhu, Yimei; Cava, R. J.

    2015-03-17

    Polymorphism in materials often leads to significantly different physical properties - the rutile and anatase polymorphs of TiO? are a prime example. Polytypism is a special type of polymorphism, occurring in layered materials when the geometry of a repeating structural layer is maintained but the layer stacking sequence of the overall crystal structure can be varied; SiC is an example of a material with many polytypes. Although polymorphs can have radically different physical properties, it is much rarer for polytypism to impact physical properties in a dramatic fashion. Here we study the effects of polytypism and polymorphism on the superconductivitymoreof TaSe?, one of the archetypal members of the large family of layered dichalcogenides. We show that it is possible to access 2 stable polytypes and 2 stable polymorphs in the TaSe2-xTex solid solution, and find that the 3R polytype shows a superconducting transition temperature that is between 6 and 17 times higher than that of the much more commonly found 2H polytype. The reason for this dramatic change is not apparent, but we propose that it arises either from a remarkable dependence of Tc on subtle differences in the characteristics of the single layers present, or from a surprising effect of the layer stacking sequence on electronic properties that instead are expected to be dominated by the properties of a single layer in materials of this kind.less

  11. Development of Ta-based Superconducting Tunnel Junction X-ray Detectors for Fluorescence XAS

    SciTech Connect (OSTI)

    Friedrich, S; Drury, O; Hall, J; Cantor, R

    2009-09-23

    We are developing superconducting tunnel junction (STJ) soft X-ray detectors for chemical analysis of dilute samples by fluorescence-detected X-ray absorption spectroscopy (XAS). Our 36-pixel Nb-based STJ spectrometer covers a solid angle {Omega}/4{pi} {approx} 10{sup -3}, offers an energy resolution of {approx}10-20 eV FWHM for energies up to {approx}1 keV, and can be operated at total count rates of {approx}10{sup 6} counts/s. For increased quantum efficiency and cleaner response function, we have now started the development of Ta-based STJ detector arrays. Initial devices modeled after our Nb-based STJs have an energy resolution below 10 eV FWHM for X-ray energies below 1 keV, and pulse rise time discrimination can be used to improve their response function for energies up to several keV. We discuss the performance of the Ta-STJs and outline steps towards the next-generation of large STJ detector arrays with higher sensitivity.

  12. Polytypism, polymorphism, and superconductivity in TaSe2–xTex

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Luo, Huixia; Xie, Weiwei; Tao, Jing; Inoue, Hiroyuki; Gyenis, András; Krizan, Jason W.; Yazdani, Ali; Zhu, Yimei; Cava, Robert Joseph

    2015-03-03

    Polymorphism in materials often leads to significantly different physical properties - the rutile and anatase polymorphs of TiO₂ are a prime example. Polytypism is a special type of polymorphism, occurring in layered materials when the geometry of a repeating structural layer is maintained but the layer stacking sequence of the overall crystal structure can be varied; SiC is an example of a material with many polytypes. Although polymorphs can have radically different physical properties, it is much rarer for polytypism to impact physical properties in a dramatic fashion. Here we study the effects of polytypism and polymorphism on the superconductivitymore » of TaSe₂, one of the archetypal members of the large family of layered dichalcogenides. We show that it is possible to access 2 stable polytypes and 2 stable polymorphs in the TaSe2-xTex solid solution, and find that the 3R polytype shows a superconducting transition temperature that is between 6 and 17 times higher than that of the much more commonly found 2H polytype. Thus, the reason for this dramatic change is not apparent, but we propose that it arises either from a remarkable dependence of Tc on subtle differences in the characteristics of the single layers present, or from a surprising effect of the layer stacking sequence on electronic properties that instead are expected to be dominated by the properties of a single layer in materials of this kind.« less

  13. The problem of intermixing of metals possessing no mutual solubility upon explosion welding (Cu-Ta, Fe-Ag, Al-Ta)

    SciTech Connect (OSTI)

    Greenberg, B.A.; Ivanov, M.A.; Rybin, V.V.; Elkina, O.A.; Antonova, O.V.; Patselov, A.M.; Inozemtsev, A.V.; Plotnikov, A.V.; Volkova, A.Yu.; Besshaposhnikov, Yu.P.

    2013-01-15

    On the basis of the results obtained for joints of dissimilar metals such as copper-tantalum and iron-silver, the reason of immiscible suspensions mixing upon explosion welding has been cleared out. It has been found that the interface (plain or wavy) is not smooth and contains inhomogeneities, namely, cusps and local melting zones. The role of granulating fragmentation providing partitioning of initial materials as a main channel of input energy dissipation has been revealed. It has been shown that in joints of metals possessing normal solubility the local melting zones are true solutions, but if metals possess no mutual solubility the local melting zones are colloidal solutions. Realization of either emulsion or suspension variant takes place. The results can be used in the development of new joints of metals possessing no mutual solubility. - Highlights: Black-Right-Pointing-Pointer Immiscible pairs Ta/Cu and Fe/Ag are welded successfully by explosive welding. Black-Right-Pointing-Pointer Fragmentation provides for partitioning as the main energy dissipation channel. Black-Right-Pointing-Pointer Immiscible metals form colloidal solid solutions during solidification. Black-Right-Pointing-Pointer Melting and boiling temperatures ratio determines the colloidal solution type. Black-Right-Pointing-Pointer Local melting zones being in suspension form enhance welds hardening.

  14. Chemical stability of highly (0001) textured Sm(CoCu){sub 5} thin films with a thin Ta capping layer

    SciTech Connect (OSTI)

    Zhao Haibao; Wang Hao; Liu Xiaoqi; Wang Jianping; Zhang Tao

    2011-04-01

    With the highest magnetocrystalline anisotropy constant (Ku) among practical magnetic materials, SmCo{sub 5} could be a very attractive candidate for future high areal density magnetic recording. However, its corrosion resistance is always a concern in recording media applications. In this paper, the chemical stability and microstructures of highly (0001) textured Sm(CoCu){sub 5} thin films with and without a 3 nm Ta capping layer were reported. For Sm(CoCu){sub 5} thin films without a capping layer, the coercivity decreases significantly (from 8kOe to 1kOe) within one month. Sm(CoCu){sub 5} thin films capped with a thin Ta layer (3 nm) behave differently. Even exposed to a laboratory environment (25 deg. C) over 3 years, the Ta-capped Sm(CoCu){sub 5} thin films are stable in terms of structural and magnetic properties, i.e., there were no changes in X-ray diffraction peaks and vibrating sample magnetometer hysteresis loops. Microstructure of Ta-capped Sm(CoCu){sub 5} thin films showed that Sm(CoCu){sub 5} formed a domelike particle assembly structure on a smooth Ru underlayer and were well covered by partially oxidized Ta capping layer, as shown by TEM cross-section micrographs. Accelerated corrosion treatment (130 deg. C, 95% relative humidity, 6 h) was performed on Ta-capped Sm(CoCu){sub 5} thin films. X-ray photoelectron spectroscopy (XPS) results showed that no Co was detected on the sample surface before the corrosion treatment, but strong XPS signals of CoOx and Co(OH)x were observed after treatment. Therefore, none of our Sm(CoCu){sub 5} thin films can pass the accelerated corrosion test. Hcp-phased CoPt-alloys are proposed as better capping materials for Sm(CoCu){sub 5} thin films in future high-density magnetic recording applications.

  15. NEPA REVIE\ry LASO-10-001 CATEGORICAL EXCLUSION FUELS RESEARCH LAB AT TA-35.455

    National Nuclear Security Administration (NNSA)

    REVIE\ry LASO-10-001 CATEGORICAL EXCLUSION FUELS RESEARCH LAB AT TA-35.455 I. DESCRIPTION OF PROPOSED ACTION: Los Alamos National Laboratory proposes to modify an existing laboratory for a Fuels Research Lab (455-FRL). The laboratory would be used to fabricate and characterize fuel pellets. The proposed activities would take place at the former location of the Polymers & Coating Lab (PCL) located at TA-35, Building 455, in room 104. Authorization would need to be obtained for the processing

  16. Synthesis of high-strength W-Ta ultrafine-grain composites

    SciTech Connect (OSTI)

    Ott, R. T.; Yang, X. Y.; Guyer, D. E.; Chauhan, S.; Sordelet, D. J.

    2015-09-30

    Bulk samples of an ultrafine-grained tungstentantalum composite alloy have been synthesized by consolidating mechanically milled composite powders. The grain growth during densification is limited due to the submicron-scale layering of the individual metals in the composite particles and the relatively low sintering temperature (1300 C). The ultrafine microstructure of the high-density (~99% theoretical density) samples leads to a high yield stress of ~3 GPa under quasi-static uniaxial compression. A tendency for Ta-rich solid-solution formation during densification was observed, and the high-temperature phase equilibria in the composite powders were examined further using high-energy x-ray diffraction at temperatures up to 1300 C.

  17. Preparation and photocatalytic activity for water splitting of Pt-Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays

    SciTech Connect (OSTI)

    Liu, Jing; Liu, Jiawen; Li, Zhonghua

    2013-02-15

    Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays were prepared by hydrothermal method from Ta{sub 2}O{sub 5} nanotube arrays, obtained by anodization of Ta foils, in Na{sub 2}CO{sub 3} solution at 150 Degree-Sign C. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-vis diffuse reflectance spectra (UV-DRS) and X-ray photoelectron spectroscopy (XPS). Analysis results show that pyrochlore structure Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays have been successfully fabricated. The diameters and lengths of Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays are 50 nm and 4 {mu}m, respectively. The photocatalytic hydrogen production activities of the as-synthesized Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays are highly dependent on the hydrothermal reaction time and Na{sub 2}CO{sub 3} concentration, optimized reaction parameters are obtained. To further improve the photocatalytic activity for hydrogen evolution, Pt loaded Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays are prepared by photochemical reduction method. The Pt loaded samples exhibit much higher activity for hydrogen evolution than pure Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays. Moreover, the photocatalytic hydrogen properties are rather stable. - Graphical abstract: Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays were synthesized by hydrothermal method using Ta{sub 2}O{sub 5} nanotube arrays as a precursor. The loaded Pt enhances the photocatalytic activity for water splitting of Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays. Highlights: Black-Right-Pointing-Pointer Novel Na{sub 2}Ta{sub 2}O{sub 6} nanotube array films with pyrochlore structure were synthesized. Black-Right-Pointing-Pointer Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays are active for H{sub 2} evolution from aqueous CH{sub 3}OH solution. Black-Right-Pointing-Pointer The effect of hydrothermal conditions on photocatalytic activity was investigated. Black-Right-Pointing-Pointer Pt loading can improve the photocatalytic activities of Na{sub 2}Ta{sub 2}O{sub 6} nanotube arrays. Black-Right-Pointing-Pointer Photocatalytic mechanism is proposed based on the experimental results.

  18. Measured Whole-House Performance of TaC Studios Test Home

    SciTech Connect (OSTI)

    Butler, T.; Curtis, O.; Stephenson, R.

    2013-12-01

    As part of the NAHB Research Center Industry Partnership, Southface partnered with TaC Studios, an Atlanta-based architecture firm specializing in residential and light commercial design, on the construction of a new test home in Atlanta, GA, in the mixed humid climate. This home serves as a residence and home office for the firm's owners, as well as a demonstration of their design approach to potential and current clients. Southface believes the home demonstrates current best practices for the mixed-humid climate, including a building envelope featuring advanced air sealing details and low density spray foam insulation, glazing that exceeds ENERGY STAR requirements, and a high performance heating and cooling system. Construction quality and execution was a high priority for TaC Studios and was ensured by a third party review process. Post-construction testing showed that the project met stated goals for envelope performance, an air infiltration rate of 2.15 ACH50. The homeowners wished to further validate whole house energy savings through the project's involvement with Building America and this long-term monitoring effort. As a Building America test home, this home was evaluated to detail whole house energy use, end use loads, and the efficiency and operation of the ground source heat pump and associated systems. Given that the home includes many non-typical end use loads including a home office, pool, landscape water feature, and other luxury features not accounted for in Building America modeling tools, these end uses were separately monitored to determine their impact on overall energy consumption.

  19. Application of cluster-plus-glue-atom model to barrierless CuNiTi and CuNiTa films

    SciTech Connect (OSTI)

    Li, Xiaona, E-mail: lixiaona@dlut.edu.cn; Ding, Jianxin; Wang, Miao; Dong, Chuang [Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024 (China); Chu, Jinn P. [Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan (China)

    2014-11-01

    To improve the thermal stability of copper and avoid its diffusion into surrounding dielectrics or interfacial reactions with them, the authors applied the cluster-plus-glue-atom model to investigate barrierless CuNiM (M?=?Ti or Ta) seed layers. The dissolution of the third element (Ti or Ta) in the Cu lattice with the aid of Ni significantly improved the thermal stability of the Cu seed layer. The appropriate M/Ni (M?=?Ti or Ta) ratio was selected to obtain a low resistivity: the resistivity was as low as 2.5??? cm for the (Ti{sub 1.5/13.5}Ni{sub 12/13.5}){sub 0.3}Cu{sub 99.7} film and 2.8??? cm for the (Ta{sub 1.1/13.1}Ni{sub 12/13.1}){sub 0.4}Cu{sub 99.6} film after annealing at 500?C for 1?h. After annealing at 500?C for 40?h, the two films remained stable without forming a Cu{sub 3}Si compound. The authors confirmed that the range of applications of the cluster-plus-glue-atom model could be extended. Therefore, a third element M with negative enthalpies of mixing with both Cu and Ni could be selected, under the premise that the mixing enthalpy of MNi is more negative than that of MCu.

  20. Properties of Ta{sub 2}O{sub 5} thin films prepared by ion-assisted deposition

    SciTech Connect (OSTI)

    Farhan, Mansour S. [College of Engineering, Wasit University (Iraq); Zalnezhad, E., E-mail: erfan_zalnezhad@yahoo.com [Center of Advanced Manufacturing and Material Processing, Department of Engineering Design and Manufacture, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603 (Malaysia); Bushroa, A.R. [Center of Advanced Manufacturing and Material Processing, Department of Engineering Design and Manufacture, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603 (Malaysia)

    2013-10-15

    Graphical abstract: - Highlights: Investigating the effect of ion-beam parameters on optical properties. Exploring the effect of ion-beam parameters on structural properties. Studying XRD patterns of Ta{sub 2}O{sub 5} films deposited at different ion energies. - Abstract: Tantalum penta-oxide (Ta{sub 2}O{sub 5}) thin films were deposited onto highly polished and clean, fused silica glass substrates via ion beam-assisted deposition at room temperature using a high-vacuum coater equipped with an electron beam gun. The effects of ion beam parameters, oxygen flow rate, and deposition rate on the optical and structural properties as well as the stress of Ta{sub 2}O{sub 5} films were studied. It has been revealed that Ta{sub 2}O{sub 5} thin films deposited at 300 eV ion beam energy, 60 ?A/cm{sup 2} ion current density, 20 sccm oxygen flow rate and 0.6 nm/s deposition rate demonstrated excellent optical, structural and compressive stress.

  1. Progress in Studies of Electron-Cloud-Induced Optics Distortions at CesrTA

    SciTech Connect (OSTI)

    Crittenden, James; Calvey, Joseph; Dugan, Gerald; Kreinick, David; Leong, Zhidong; Livezey, Jesse; Palmer, Mark; Rubin, David; Sagan, David; Furman, Miguel; Penn, Gregory; Venturini, Marco; Harkay, Katherine; Holtzapple, Robert; Pivi, Mauro; Wang, Lanfa; /SLAC

    2012-06-25

    The Cornell Electron Storage Ring Test Accelerator (CesrTA) program has included extensive measurements of coherent betatron tune shifts for a variety of electron and positron beam energies, bunch population levels, and bunch train configurations. The tune shifts have been shown to result primarily from the interaction of the beam with the space-charge field of the beam-induced low-energy electron cloud in the vacuum chamber. Comparison to several advanced electron cloud simulation codes has allowed determination of the sensitivity of these measurements to physical parameters characterizing the synchrotron radiation flux, the production of photo-electrons on the vacuum chamber wall, the beam emittance, lattice optics, and the secondary-electron yield model. We report on progress in understanding the cloud buildup and decay mechanisms in magnetic fields and in field-free regions, addressing quantitatively the precise determination of the physical parameters of the modeling. Validation of these models will serve as essential input in the design of damping rings for future high-energy linear colliders.

  2. Strain control magnetocrystalline anisotropy of Ta/FeCo/MgO heterostructures

    SciTech Connect (OSTI)

    Ong, P. V.; Kioussis, Nicholas; Amiri, P. Khalili; Wang, K. L.; Carman, Gregory P.

    2015-05-07

    Using ab initio electronic structure calculations, we have investigated the effect of epitaxial strain on magnetocrystalline anisotropy (MCA) of Ta/FeCo/MgO heterostructure. At small expansive strains on the FeCo layer, the system exhibits perpendicular MCA (PMA). Strain not only has a profound effect on the value of MCA but also induces a switching of magnetic easy axis. Analysis of the energy- and k-resolved distribution of orbital characters of the minority-spin band reveals that a significant contribution to PMA at zero strain arises from the spin-orbit coupling between occupied d{sub x{sup 2}−y{sup 2}} and unoccupied d{sub xy} states, derived from Fe at the FeCo/MgO interface. The strain effect is attributed to strain-induced shifts of spin-orbit coupled d-states. Our work demonstrates that strain engineering can open a viable pathway towards tailoring magnetic properties for spintronic applications.

  3. Competing decay modes of a high-spin isomer in the proton-unbound nucleus ¹⁵⁸Ta*

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Carroll, R. J.; Page, R. D.; Joss, D. T.; Uusitalo, J.; Darby, I. G.; Andgren, K.; Cederwall, B.; Eeckhaudt, S.; Grahn, T.; Gray-Jones, C.; et al

    2015-01-01

    An isomeric state at high spin and excitation energy was recently observed in the proton-unbound nucleus 158Ta. This state was observed to decay by both α and γ decay modes. The large spin change required to decay via γ-ray emission incurs a lifetime long enough for α decay to compete. The α decay has an energy of 8644(11) keV, which is among the highest observed in the region, a partial half-life of 440(70) μs and changes the spin by 11ℏ. In this study, additional evidence supporting the assignment of this α decay to the high-spin isomer in 158Ta will bemore » presented.« less

  4. Electronic structure reconstruction across the antiferromagnetic transition in TaFe₁̣₂₃Te₃ spin ladder

    SciTech Connect (OSTI)

    Xu, Min; Wang, Li -Min; Peng, Rui; Ge, Qing -Qin; Chen, Fei; Ye, Zi -Rong; Zhang, Yan; Chen, Su -Di; Xia, Miao; Liu, Rong -Hua; Arita, M.; Shimada, K.; Namatame, H.; Taniguchi, M.; Matsunami, M.; Kimura, S.; Shi, Ming; Chen, Xian -Hui; Yin, Wei -Guo; Ku, Wei; Xie, Bin -Ping; Feng, Dong -Lai

    2015-02-01

    With angle-resolved photoemission spectroscopy, we studied the electronic structure of TaFe₁̣₂₃Te₃, a two-leg spin ladder compound with a novel antiferromagnetic ground state. Quasi-two-dimensional Fermi surface is observed, with sizable inter-ladder hopping. Moreover, instead of observing an energy gap at the Fermi surface in the antiferromagnetic state, we observed the shifts of various bands. Combining these observations with density-functional-theory calculations, we propose that the large scale reconstruction of the electronic structure, caused by the interactions between coexisting itinerant electrons and local moments, is most likely the driving force of the magnetic transition. Thus TaFe₁̣₂₃Te₃ serves as a simpler platform that contains similar ingredients as the parent compounds of iron-based superconductors.

  5. All-metallic electrically gated 2H-TaSe{sub 2} thin-film switches and logic circuits

    SciTech Connect (OSTI)

    Renteria, J.; Jiang, C.; Yan, Z.; Samnakay, R.; Goli, P.; Pope, T. R.; Salguero, T. T.; Wickramaratne, D.; Lake, R. K.; Khitun, A. G.; Balandin, A. A.

    2014-01-21

    We report the fabrication and performance of all-metallic three-terminal devices with tantalum diselenide thin-film conducting channels. For this proof-of-concept demonstration, the layers of 2H-TaSe{sub 2} were exfoliated mechanically from single crystals grown by the chemical vapor transport method. Devices with nanometer-scale thicknesses exhibit strongly non-linear current-voltage characteristics, unusual optical response, and electrical gating at room temperature. We have found that the drain-source current in thin-film 2H-TaSe{sub 2}Ti/Au devices reproducibly shows an abrupt transition from a highly resistive to a conductive state, with the threshold tunable via the gate voltage. Such current-voltage characteristics can be used, in principle, for implementing radiation-hard all-metallic logic circuits. These results may open new application space for thin films of van der Waals materials.

  6. Electronic structure reconstruction across the antiferromagnetic transition in TaFe₁̣₂₃Te₃ spin ladder

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Xu, Min; Wang, Li -Min; Peng, Rui; Ge, Qing -Qin; Chen, Fei; Ye, Zi -Rong; Zhang, Yan; Chen, Su -Di; Xia, Miao; Liu, Rong -Hua; et al

    2015-02-01

    With angle-resolved photoemission spectroscopy, we studied the electronic structure of TaFe₁̣₂₃Te₃, a two-leg spin ladder compound with a novel antiferromagnetic ground state. Quasi-two-dimensional Fermi surface is observed, with sizable inter-ladder hopping. Moreover, instead of observing an energy gap at the Fermi surface in the antiferromagnetic state, we observed the shifts of various bands. Combining these observations with density-functional-theory calculations, we propose that the large scale reconstruction of the electronic structure, caused by the interactions between coexisting itinerant electrons and local moments, is most likely the driving force of the magnetic transition. Thus TaFe₁̣₂₃Te₃ serves as a simpler platform that containsmore » similar ingredients as the parent compounds of iron-based superconductors.« less

  7. Improvement of the photoluminescent intensity of ZnTa{sub 2}O{sub 6}:Pr{sup 3+} phosphor

    SciTech Connect (OSTI)

    Noto, L.L. Ntwaeaborwa, O.M.; Yagoub, M.Y.A.; Swart, H.C.

    2014-07-01

    Highlights: The optimal luminescence intensity was obtained for 0.4 mol% Pr{sup 3+} doped ZnTa{sub 2}O{sub 6}. The ZnTa{sub 2}O{sub 6}:Pr{sup 3+} has a colour index matching an ideal red emission. The cross relaxation process led to a decrease in red emission at higher Pr{sup 3+} concentrations. The blue emission continues to increase at higher Pr{sup 3+} concentrations. The persistent luminescent increases with an increase in Pr{sup 3+} concentration. - Abstract: A red emitting ZnTa{sub 2}O{sub 6}:Pr{sup 3+} phosphor with Commission Internationale de lEclairage coordinates that match those of an ideal red emission was prepared by solid state chemical reaction. X-ray diffraction confirmed that a pure orthorhombic phase of ZnTa{sub 2}O{sub 6} was crystallized. A homogeneous distribution of the Pr{sup 3+} ions was confirmed from the analysis of the time of flight secondary ion mass spectroscopy overlay images. In addition to the reflectance at 259 nm associated with band-to-band absorption, minor reflectance peaks associated with f-f transitions of Pr{sup 3+} were observed at 420500 nm. The main red emission peak was split into minor peaks located at 608, 619 and 639 nm that were assigned to {sup 1}D{sub 2} ? {sup 3}H{sub 4}, {sup 3}P{sub 0} ? {sup 3}H{sub 6} and {sup 3}P{sub 0} ? {sup 3}F{sub 2} transitions of Pr{sup 3+}, respectively. With increasing concentration of Pr{sup 3+}, a relatively weak blue emission was observed at 488 nm and this phenomenon maybe attributed to virtual charge transfer or/and inter cross relaxation effects. The decay characteristics of the persistent emission were also calculated.

  8. Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Tarantini, C.; Sung, Z. -H.; Lee, P. J.; Ghosh, A. K.; Larbalestier, D. C.

    2016-01-25

    Nb3Sn wires are now very close to their final optimization but despite its classical nature, detailed understanding of the role of Ta and Ti doping in the A15 is not fully understood. Long thought to be essentially equivalent in their influence on Hc2, they were interchangeably applied. Here we show that Ti produces significantly more homogeneous chemical and superconducting properties. Despite Ta-doped samples having a slightly higher Tc onset in zero-field, they always have a wider Tc-distribution. In particular, whereas the Ta-doped A15 has a Tc-distribution extending from 18 down to 5-6 K (the lowest expected Tc for the binarymore » A15 phase), the Ti-doped samples have no A15 phase with Tc below ~12 K. The much narrower Tc distribution in the Ti-doped samples has a positive effect on their in-field Tc-distribution too, leading to an extrapolated μ0Hc2(0) 2 Tesla larger than the Ta-doped one. Ti-doping also appears to be very homogeneous even when the Sn content is reduced in order to inhibit breakdown of the diffusion barriers in very high Jc conductors. As a result, the enhanced homogeneity of the Ti-doped samples appears to result from its assistance of rapid diffusion of Sn into the filaments and by its incorporation into the A15 phase interchangeably with Sn on the Sn sites of the A15 phase.« less

  9. EP-AREAG-PLAN-1248, R.0 TA-54 Area G Nitrate-Salt Waste Container Response Instructions

    Office of Environmental Management (EM)

    EP-AREAG-PLAN-1248, R.0 TA-54 Area G Nitrate-Salt Waste Container Response Instructions Effective Date: 5/28/2014 The Responsible Manager has determined that the following organizations' review/concurrence is required for the initial document and for major revisions a same type and level review is required. Review documentation is contained in the Document History File: EWMO Engineering LANL TRU Programs - Shipping and Safe Storage Disposition LANL TRU Programs - Drum Disposition Project LANL

  10. Radionuclide contaminant analysis of small mammals at Area G, TA-54, Los Alamos National Laboratory, 1995

    SciTech Connect (OSTI)

    Bennett, K.; Biggs, J.; Fresquez, P.

    1997-01-01

    At Los Alamos National Laboratory, small mammals were sampled at two waste burial sites (Site 1-recently disturbed and Site 2-partially disturbed) at Area G, Technical Area 54 and a control site on Frijoles Mesa (Site 4) in 1995. Our objectives were (1) to identify radionuclides that are present within surface and subsurface soils at waste burial sites, (2) to compare the amount of radionuclide uptake by small mammals at waste burial sites to a control site, and (3) to identify if the primary mode of contamination to small mammals is by surface contact or ingestion/inhalation. Three composite samples of at least rive animals per sample were collected at each site. Pelts and carcasses of each animal were separated and analyzed independently. Samples were analyzed for {sup 241}Am, {sup 90}Sr , {sup 238}Pu, {sup 239}Pu, total U, {sup 137}Cs, and {sup 3}H. Significantly higher (parametric West at p=0.05) levels of total U, {sup 241}Am, {sup 238}Pu and {sup 239}Pu were detected in pelts than in carcasses of small mammals at TA-54. Concentrations of other measured radionuclides in carcasses were nearly equal to or exceeded the mean concentrations in the pelts. Our results show higher concentrations in pelts compared to carcasses, which is similar to what has been found at waste burial/contaminated sites outside of Los Alamos National Laboratory. Site 1 had a significantly higher (alpha=0.05, P=0.0125) mean tritium concentration in carcasses than Site 2 or Site 4. In addition Site 1 also had a significantly higher (alpha=0.05, p=0.0024) mean tritium concentration in pelts than Site 2 or Site 4. Site 2 had a significantly higher (alpha=0.05, P=0.0499) mean {sup 239}Pu concentration in carcasses than either Site 1 or Site 4.

  11. Photocatalytic hydrogen production using visible-light-responsive Ta{sub 3}N{sub 5} photocatalyst supported on monodisperse spherical SiO{sub 2} particulates

    SciTech Connect (OSTI)

    Liu, Xiaoming; Zhao, Lan; Domen, Kazunari; Takanabe, Kazuhiro

    2014-01-01

    Graphical abstract: A simple and effective solgel process followed by nitridation in an NH{sub 3} flow has been developed to deposit Ta{sub 3}N{sub 5} semiconductor photocatalyst layers onto monodisperse spherical SiO{sub 2} particles. The obtained Ta{sub 3}N{sub 5}/SiO{sub 2} particles maintain an original spherical morphology of SiO{sub 2} and a sub-micrometer size with a narrow size distribution and without aggregation. The presence of SiO{sub 2} support shows at least no detrimental effects on photocatalytic activity, but tunes the secondary particle size to control dispersibility of the photocatalyst in the solution. - Highlights: Fine nanoparticles of Ta{sub 3}N{sub 5} were immobilized on the surfaces of SiO{sub 2} giving SiO{sub 2}@Ta{sub 3}N{sub 5} coreshell spheres successfully produced H{sub 2} from methanol solution under visible light. The presence of support (SiO{sub 2}) ensures the dispersion of the particulate in solution maintaining high photocatalytic activity of Ta{sub 3}N{sub 5}. The obtained supported photocatalyst gives uniform size distribution and control the degree of dispersibility in the solution, which may control nature of light absorption and reflection of the photoreactor. - Abstract: Fine nanoparticles of Ta{sub 3}N{sub 5} (1020 nm) were synthesized on the surfaces of SiO{sub 2} spheres with a diameter of ?550 nm. A solgel method was used to modify the surface of SiO{sub 2} with Ta{sub 2}O{sub 5} from TaCl{sub 5} dissolved in ethanol in the presence of citric acid and polyethylene glycol. The resulting oxide composites were treated in an NH{sub 3} flow at 1123 K to form coreshell structured Ta{sub 3}N{sub 5}/SiO{sub 2} sub-microspheres. The obtained samples were characterized using powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectra (EDX), transmission electron microscopy (TEM), and photocatalytic activity measurements for H{sub 2} evolution from an aqueous methanol solution. The XRD results demonstrate the expected sequential formation of Ta{sub 2}O{sub 5} layers, followed by Ta{sub 3}N{sub 5} after nitridation on the Ta{sub 2}O{sub 5}/SiO{sub 2} composite. SEM and TEM observations indicate that the obtained Ta{sub 3}N{sub 5}/SiO{sub 2} sub-microspheres have a uniform size distribution with high crystallinity and an obvious coreshell structure. The presence of support maintained the intrinsic photocatalytic activity of Ta{sub 3}N{sub 5} nanoparticles, but it did drastically improve the dispersion of the photocatalysts in the solution. This study proposes the use of an inert support in photocatalytic reactors to improve ease of handling the powder photocatalyst for gas-phase photocatalysis and the suspension of the solution, controlling nature of light harvesting and degree of scattering of the photoreactor.

  12. Novel defect pyrochlores ABi/sub 2/B/sub 5/O/sub 16/ (A = Cs, Rb; B = Ta, Nb)

    SciTech Connect (OSTI)

    Ehlert, M.K., Greedan, J.E.; Subramanian, M.A.

    1988-07-01

    The crystal structures of three oxides with compositions CsBi/sub 2/Nb/sub 5/O/sub 16/, CsBi/sub 2/Ta/sub 5/O/sub 16/, and RbBi/sub 2/Ta/sub 5/O/sub 16/ have been determined from powder neutron diffraction data. A common structure of the defect pyrochlore types has been found. Atomic positions in space group Fd3m are 3.2 O and 3.2 Cs(Rb) in 8b, 6.4 Bi in 16d, 16 Ta(Nb) in 16c, and 48 O in 48f. There is some evidence that the Rb atoms actually occupy 32e sites. On electrostatic grounds it is highly unlikely that the Cs(Rb) and O atoms are randomly distributed in 8b. Evidence for short-range order is apparent in the X-ray powder diffraction data. Cell constants are 10.528(1) A (Cs, Nb), 10.504(1) A (Cs, Ta), and 10.510(2) A (Rb, Ta), respectively, with 48f x parameters 0.3139(2) (Cs, Nb), 0.3152(2) (Cs, Ta), and 0.3153(2) (Rb, Ta). Isotropic temperature factors for the 8b and 16d site atoms ranged from 3 to 6 (A)/sup 2/. These large values suggest anharmonic behavior or high mobility for some of the ions. Evidence for this is found in the presence of significant dielectric loss effects in all of the compounds studied.

  13. Structure of Mesita del Buey at TA-54, Los Alamos National Laboratory, New Mexico

    SciTech Connect (OSTI)

    Reneau, S.L.; Broxton, D.E.; Carney, J.S.; LaDelfe, C.

    1998-04-23

    The geological structure of Mesita del Buey at Technical Area 54 (TA-54) was examined using precise surveying of the contact between units 1v and 2 of the Tshirege Member of the Bandelier Tuff at 3.5 km along the north wall of Pajarito Canyon and 0.6 km along the north wall of a tributary to Canada del Buey. Estimated structure contours on this contact indicate typical strikes of N40E to N70E along this part of Mesita del Buey, although the apparent strike of the tuff is E-W at the western part of the survey. Typical dips are 1.0{degree} to 2.0{degree} to the east or southeast, with an estimated maximum dip of 3.2{degree} near the west end of Material Disposal Area G. Thirty seven faults with vertical displacements of 5 to 65 cm were observed in outcrop along the Pajarito Canyon traverse, and, due to the incomplete exposure of the unit 1v-unit 2 contact, many more faults of this magnitude undoubtedly exist. The faults have a wide range in strike and have either down-to-the-west and down-to-the-east components of offset, although about 65% of the observed displacement is down-to-the-west or northwest. These faults are not clearly associated with major fault zones, indicated by the general absence of larger-scale offsets or inflections along the unit 1v-unit 2 contact in areas where the small-scale faults were observed; they may instead record distributed secondary deformation across the Pajarito Plateau associated with large earthquakes on the main Pajarito fault zone 8--11 km to the west, or perhaps other faults in the region. The survey data also suggest that a 150--250 m wide zone of greater magnitude faulting is present near the west end of the traverse associated with a horst-and-graben structure displaying about 1.5--3.5 m of offset on individual faults, although the total amount of offset across this structure and its orientation are not known.

  14. Ambient Air Radionuclide Concentrations at and near TA-50 from 2003 through the First Quarter of 2004

    SciTech Connect (OSTI)

    K.W. Jacobson; C.F. Eberhart

    2005-09-05

    The Meteorology and Air Quality (MAQ) group at Los Alamos National Laboratory maintains and operates a large network of environmental air samplers called AIRNET. Some of these samplers are located near Material Disposal Area C at TA-50, a low-level radioactive waste burial site in the semiarid environment of the Pajarito Plateau, near Los Alamos. AIRNET sampling media consist of a filter and silica gel. They are exchanged once every 2 weeks. Presented are 5 months of air sampling results for 5 stations operating in the vicinity of Material Disposal Area C.

  15. Polytypism, polymorphism, and superconductivity in TaSe2–xTex

    SciTech Connect (OSTI)

    Luo, Huixia; Xie, Weiwei; Tao, Jing; Inoue, Hiroyuki; Gyenis, András; Krizan, Jason W.; Yazdani, Ali; Zhu, Yimei; Cava, Robert Joseph

    2015-03-03

    Polymorphism in materials often leads to significantly different physical properties - the rutile and anatase polymorphs of TiO₂ are a prime example. Polytypism is a special type of polymorphism, occurring in layered materials when the geometry of a repeating structural layer is maintained but the layer stacking sequence of the overall crystal structure can be varied; SiC is an example of a material with many polytypes. Although polymorphs can have radically different physical properties, it is much rarer for polytypism to impact physical properties in a dramatic fashion. Here we study the effects of polytypism and polymorphism on the superconductivity of TaSe₂, one of the archetypal members of the large family of layered dichalcogenides. We show that it is possible to access 2 stable polytypes and 2 stable polymorphs in the TaSe2-xTex solid solution, and find that the 3R polytype shows a superconducting transition temperature that is between 6 and 17 times higher than that of the much more commonly found 2H polytype. Thus, the reason for this dramatic change is not apparent, but we propose that it arises either from a remarkable dependence of Tc on subtle differences in the characteristics of the single layers present, or from a surprising effect of the layer stacking sequence on electronic properties that instead are expected to be dominated by the properties of a single layer in materials of this kind.

  16. Floodplain Assessment for the Proposed Engineered Erosion Controls at TA-72 in Lower Sandia Canyon, Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Hathcock, Charles D.

    2012-08-27

    Los Alamos National Laboratory (LANL) is preparing to implement engineering controls in Sandia Canyon at Technical Area (TA) 72. Los Alamos National Security (LANS) biologists conducted a floodplain determination and this project is located within a 100-year floodplain. The proposed project is to rehabilitate the degraded channel in lower Sandia Canyon where it crosses through the outdoor firing range at TA-72 to limit the loss of sediment and dissipate floodwater leaving LANL property (Figure 1). The proposed construction of these engineered controls is part of the New Mexico Environment Department's (NMED) approved LANL Individual Storm Water Permit. The purpose of this project is to install storm water controls at Sandia Watershed Site Monitoring Area 6 (S-SMA-6). Storm water controls will be designed and installed to meet the requirements of NPDES Permit No. NM0030759, commonly referred to as the LANL Individual Storm Water Permit (IP). The storm water control measures address storm water mitigation for the area within the boundary of Area of Concern (AOC) 72-001. This action meets the requirements of the IP for S-SMA-6 for storm water controls by a combination of: preventing exposure of upstream storm water and storm water generated within the channel to the AOC and totally retaining storm water falling outside the channel but within the AOC.

  17. Structural and thermal studies of H{sub 2}La{sub 2/3}Ta{sub 2}O{sub 7}, a protonated layered perovskite

    SciTech Connect (OSTI)

    Le Berre, F.; Crosnier-Lopez, M.P.; Fourquet, J.L.

    2006-04-13

    We have synthesised the new protonated layered perovskite H{sub 2}La{sub 2/3}Ta{sub 2}O{sub 7} which is related to the Ruddlesden-Popper family. This compound is obtained by ionic exchange starting from Li{sub 2}La{sub 2/3}Ta{sub 2}O{sub 7} maintained in dilute HNO{sub 3} at 60 deg. C. Thermal X-ray diffraction and DTA/TGA revealed interesting dehydration properties with formation of a layered anhydrous phase leading at higher temperature (1550 deg. C) to La{sub 1/3}TaO{sub 3}. This latter compound exhibits the original lanthanum ordering expected similarly to that of the Li form, while at 900 deg. C a metastable form, presenting a disordered La distribution, is observed.

  18. Synthesis, properties and phase transitions of pyrochlore- and fluorite-like Ln{sub 2}RMO{sub 7} (Ln = Sm, Ho; R = Lu, Sc; M = Nb, Ta)

    SciTech Connect (OSTI)

    Shlyakhtina, A.V.; Belov, D.A.; Pigalskiy, K.S.; Shchegolikhin, A.N.; Kolbanev, I.V.; Karyagina, O.K.

    2014-01-01

    Graphical abstract: Temperature dependences of bulk conductivity for Sm{sub 2}ScTaO{sub 7} pyrochlore prepared at (1) 1400 °C, 20 h; and (2) 1200 °C, 40 h. - Highlights: • The phase formation of Ln{sub 2}RMO{sub 7} (Ln = Sm, Ho; R = Lu, Sc; M = Nb, Ta) at 1200–1600 °C. • The bulk conductivity and magnetic susceptibility were measured. • The bulk conductivity of Sm{sub 2}ScTaO{sub 7} has oxygen ion type at T ≥ 750 °C. • The first-order structural phase transition was observed in Sm{sub 2}ScTaO{sub 7} at ∼650–700 °C. • This phase transformation is not typical for defect fluorites. - Abstract: We have studied the new compounds with fluorite-like (Ho{sub 2}RNbO{sub 7} (R = Lu, Sc)) and pyrochlore-like (Sm{sub 2}ScTaO{sub 7}) structure as potential oxide ion conductors. The phase formation process (from 1200 to 1600 °C) and physical properties (electrical, thermo mechanical, and magnetic) for these compounds were investigated. Among the niobate materials the highest bulk conductivity is offered by the fluorite-like Ho{sub 2}ScNbO{sub 7} synthesized at 1600 °C: 3.8 × 10{sup −5} S/cm at 750 °C, whereas in Sm system the highest bulk conductivity, 7.3 × 10{sup −6} S/cm at 750 °C, is offered by the pyrochlore Sm{sub 2}ScTaO{sub 7} synthesized at 1400 °C. In Sm{sub 2}ScTaO{sub 7} pyrochlore we have observed the first-order phase transformation at ∼650–700 °C is related to rearrangement process in the oxygen sublattice of the pyrochlore structure containing B-site cations in different valence state and actually is absent in the defect fluorites. The two holmium niobates show Curie–Weiss paramagnetic behavior, with the prevalence of antiferromagnetic coupling. The magnetic susceptibility of Sm{sub 2}ScTaO{sub 7} is a weak function of temperature, corresponding to Van Vleck paramagnetism.

  19. Signature-Dependent Electromagnetic Transition Rates in the {pi}h{sub 11/2} Rotational Sequence of {sub 73}{sup 167}Ta

    SciTech Connect (OSTI)

    R. Chapman; K.-M. Spohr; M.B. Smith; R.A. Bark; G.J. Campbell; G.B. Hagemann; N. Keeley; D.J. Middleton; H. Ryde; P.O. Tjom

    1999-12-31

    Excited states in {sup 167}Ta, populated in the {sup 141}Pr({sup 30}Si, 4n){sup 167}Ta reaction, have been studied using the NORDBALL Ge detector array. For the {pi}h{sub 11/2}[514]{sub 2}{sup 9}{sup -} decay sequence, strong signature-dependent effects in the transition quadrupole moment ratio, Q{sub 1}(I {yields} I - 1)/Q{sub 2}(I {yields} I - 2), have been observed over the spin range {sub 2}{sup 21}{<=}I{<=}{sub 2}{sup 39} which encompasses a BC neutron alignment. This is interpreted as strong evidence for departure from axial symmetry.

  20. Signature-dependent electromagnetic transition rates in the {pi}h{sub 11/2} rotational sequence of {sub 73}{sup 167}Ta

    SciTech Connect (OSTI)

    Chapman, R.; Spohr, K.-M.; Smith, M. B.; Campbell, G. J.; Middleton, D. J.; Bark, R. A.; Ryde, H.; Hagemann, G. B.; Keeley, N.; Tjoem, P. O.

    1999-11-16

    Excited states in {sup 167}Ta, populated in the {sup 141}Pr({sup 30}Si,4n){sup 167}Ta reaction, have been studied using the NORDBALL Ge detector array. For the {pi}h{sub 11/2}[514]9/2{sup -} decay sequence, strong signature-dependent effects in the transition quadrupole moment ratio, Q{sub 1}(I{yields}I-1)/Q{sub 2}(I{yields}I-2), have been observed over the spin range 21/2{<=}I{<=}39/2 which encompasses a BC neutron alignment. This is interpreted as strong evidence for departure from axial symmetry.

  1. Spin Hall switching of the magnetization in Ta/TbFeCo structures with bulk perpendicular anisotropy

    SciTech Connect (OSTI)

    Zhao, Zhengyang; Jamali, Mahdi; Smith, Angeline K.; Wang, Jian-Ping

    2015-03-30

    Spin-orbit torques are studied in Ta/TbFeCo/MgO patterned structures, where the ferrimagnetic material TbFeCo provides a strong bulk perpendicular magnetic anisotropy (bulk-PMA) independent of the interfaces. The current-induced magnetization switching in TbFeCo is investigated in the presence of a perpendicular, longitudinal, or transverse field. An unexpected partial-switching phenomenon is observed in the presence of a transverse field unique to our bulk-PMA material. It is found that the anti-damping torque related with spin Hall effect is very strong, and a spin Hall angle is determined to be 0.12. The field-like torque related with Rashba effect is unobservable, suggesting that the interface play a significant role in Rashba-like torque.

  2. Resistance controllability and variability improvement in a TaO{sub x}-based resistive memory for multilevel storage application

    SciTech Connect (OSTI)

    Prakash, A. E-mail: amit.knp02@gmail.com Song, J.; Hwang, H. E-mail: amit.knp02@gmail.com; Deleruyelle, D.; Bocquet, M.

    2015-06-08

    In order to obtain reliable multilevel cell (MLC) characteristics, resistance controllability between the different resistance levels is required especially in resistive random access memory (RRAM), which is prone to resistance variability mainly due to its intrinsic random nature of defect generation and filament formation. In this study, we have thoroughly investigated the multilevel resistance variability in a TaO{sub x}-based nanoscale (<30 nm) RRAM operated in MLC mode. It is found that the resistance variability not only depends on the conductive filament size but also is a strong function of oxygen vacancy concentration in it. Based on the gained insights through experimental observations and simulation, it is suggested that forming thinner but denser conductive filament may greatly improve the temporal resistance variability even at low operation current despite the inherent stochastic nature of resistance switching process.

  3. Building America Case Study: Ground Source Heat Pump Research, TaC Studios Residence, Atlanta, Georigia (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2014-09-01

    As part of the NAHB Research Center Industry Partnership, Southface partnered with TaC Studios, an Atlanta based architecture firm specializing in residential and light commercial design, on the construction of a new test home in Atlanta, GA in the mixed-humid climate. This home serves as a residence and home office for the firm's owners, as well as a demonstration of their design approach to potential and current clients. Southface believes the home demonstrates current best practices for the mixed-humid climate, including a building envelope featuring advanced air sealing details and low density spray foam insulation, glazing that exceeds ENERGY STAR requirements, and a high performance heating and cooling system. Construction quality and execution was a high priority for TaC Studios and was ensured by a third party review process. Post construction testing showed that the project met stated goals for envelope performance, an air infiltration rate of 2.15 ACH50. The homeowner's wished to further validate whole house energy savings through the project's involvement with Building America and this long-term monitoring effort. As a Building America test home, this home was evaluated to detail whole house energy use, end use loads, and the efficiency and operation of the ground source heat pump and associated systems. Given that the home includes many non-typical end use loads including a home office, pool, landscape water feature, and other luxury features not accounted for in Building America modeling tools, these end uses were separately monitored to determine their impact on overall energy consumption.

  4. The susceptibility of TaOx-based memristors to high dose rate ionizing radiation and total ionizing dose

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    McLain, Michael Lee; Sheridan, Timothy J.; Hjalmarson, Harold Paul; Mickel, Patrick R.; Hanson, Donald J.; McDonald, Joseph K.; Hughart, David Russell; Marinella, Matthew J.

    2014-11-11

    This paper investigates the effects of high dose rate ionizing radiation and total ionizing dose (TID) on tantalum oxide (TaOx) memristors. Transient data were obtained during the pulsed exposures for dose rates ranging from approximately 5.0 ×107 rad(Si)/s to 4.7 ×108 rad(Si)/s and for pulse widths ranging from 50 ns to 50 μs. The cumulative dose in these tests did not appear to impact the observed dose rate response. Static dose rate upset tests were also performed at a dose rate of ~3.0 ×108 rad(Si)/s. This is the first dose rate study on any type of memristive memory technology. Inmore » addition to assessing the tolerance of TaOx memristors to high dose rate ionizing radiation, we also evaluated their susceptibility to TID. The data indicate that it is possible for the devices to switch from a high resistance off-state to a low resistance on-state in both dose rate and TID environments. The observed radiation-induced switching is dependent on the irradiation conditions and bias configuration. Furthermore, the dose rate or ionizing dose level at which a device switches resistance states varies from device to device; the enhanced susceptibility observed in some devices is still under investigation. As a result, numerical simulations are used to qualitatively capture the observed transient radiation response and provide insight into the physics of the induced current/voltages.« less

  5. New high pressure rare earth tantalates RE{sub x}Ta{sub 2}O{sub 5+1.5x} (RE=La, Eu, Yb)

    SciTech Connect (OSTI)

    Zibrov, Igor P.; Filonenko, Vladimir P.; Zakharov, Nikolai D.; Nikishina, Elena E.; Lebedeva, Elena N.

    2013-07-15

    Rare earth tantalates La{sub 0.075}Ta{sub 2}O{sub 5.113}, Eu{sub 0.089}Ta{sub 2}O{sub 5.134} and Yb{sub 0.051}Ta{sub 2}O{sub 5.077} have been prepared by solid state reaction at P=7.0 GPa and T=1050–1100 °C and studied by X-ray diffraction, thermal analysis and electron microscopy. Low hydrated amorphous tantalum, lanthanum, europium and ytterbium hydroxides were used as starting materials. Aqueous as well as anhydrous compounds were obtained. Title tantalates are crystallized in the structure type of F–Ta{sub 2}O{sub 5} [Zibrov et al. Russ. J. Inorg. Chem. 48 (2003) 464–471] [5]. The structure was refined by the Rietveld method from X-ray powder diffractometer data: La{sub 0.075}Ta{sub 2}O{sub 5.113}, a=10.5099(2), b=7.2679(1), c=6.9765(1) Å, V=532.90(1) Å{sup 3}, Z=6, space group Ibam; Eu{sub 0.089}Ta{sub 2}O{sub 5.134}, a=10.4182(3), b=7.2685(1), c=6.9832(1) Å, V=528.80(2) Å{sup 3}, Z=6, space group Ibam; Yb{sub 0.051}Ta{sub 2}O{sub 5.077}, a=10.4557(2), b=7.3853(1), c=6.8923(1) Å, V=532.21(1) Å{sup 3}, Z=6, space group Ibam. RE atoms do not replace the tantalum in its positions but the only water in the channels of the structure. Highly charged cations RE{sup +3} compress the unit cell so that its volume becomes less than that of F–Ta{sub 2}O{sub 5}. Significant decrease of the unit cell volume after water removal from the structure is possible due to the puckering of pentagonal bipyramid layers and change of the corrugation angle in the layer. - Graphical abstract: The structure of RE{sub x}Ta{sub 2}O{sub 5+1.5x} and its HRTEM image (“A” arrows show empty channel, “B” arrows show filled channel). - Highlights: • We synthesized new tantalates of RE under high pressure high temperature conditions. • RE atoms replace water molecules in the channels of the structure. • Aqueous as well as anhydrous tantalates were obtained. • Highly charged cations RE{sup +3} compress the unit cell decreasing RE–O distances.

  6. Tailoring the magnetic properties of new Fe-Ni-Co-Al-(Ta,Nb)-B superelastic rapidly quenched microwires

    SciTech Connect (OSTI)

    Borza, F. Lupu, N.; Dobrea, V.; Chiriac, H.

    2015-05-07

    Ferromagnetic Fe-Ni-Co-Al-(Ta,Nb)-B microwires with diameters from 170 μm to 50 μm, which possess both superelastic and good magnetic properties, have been prepared by rapid quenching from the melt using the in rotating water spinning technique followed by cold-drawing and ageing. The cold-drawing and annealing processes lead to the initialization of premartensitic phases as confirmed by the X-ray diffraction and scanning transmission electron microscopic investigations, more significantly in the 50 μm cold-drawn microwires. An increase in the coercive field and in the saturation magnetization has been obtained by annealing, more importantly in the case of Nb-containing alloy. Ageing by thermal or current annealing led to the initialization of the superelastic effect. High values of strain of up to 1.8%, very good repeatability under successive loading, and values of superelastic effect of up to 1.2% have been achieved. The structural analysis coupled with the stress-strain data suggests that these materials annealed at 800 °C have superelastic potential at reduced ageing times. The magnetic behavior was found to be easily tailored through both thermal and thermomagnetic treatments with changes in the magnetic parameters which can be contactless detected. The results are important for future applications where both mechanical and magnetic properties matter, i.e., sensing/actuating systems.

  7. Multiband Te p Based Superconductivity of Ta4Pd3Te16

    SciTech Connect (OSTI)

    Singh, David J.

    2014-10-06

    We recently discovered that Ta4Pd3Te16 is a superconductor that has been suggested to be an unconventional superconductor near magnetism. Here, we report electronic structure calculations showing that despite the layered crystal structure the material is an anisotropic three-dimensional (3D) metal. The Fermi surface contains prominent one-dimensional (1D) and two-dimensional (2D) features, including nested 1D sheets, a 2D cylindrical section, and a 3D sheet. Moreover, the electronic states that make up the Fermi surface are mostly derived from Te p states with small Ta d and Pd d contributions. This places the compound far from magnetic instabilities. The results are discussed in terms of multiband superconductivity.

  8. Draft Genome Sequence of thermoalkaliphilic Caldalkalibacillus thermarum strain TA2.A1 Reveals Molecular Adaptations to Extreme pH and Temperature

    SciTech Connect (OSTI)

    Kalamorz, Falk; Keis, Stefanie; Stanton, Jo-Ann; Brown, Steven D; Klingeman, Dawn Marie; Land, Miriam L; Han, Cliff; Martin, S L.; Morgan, Hugh; Cook, Greg

    2011-01-01

    The genes and molecular machines that allow for a thermoalkaliphilic lifestyle have not been defined. To address this goal, we report on the improved high-quality draft genome sequence of Caldalkalibacillus thermarum strain TA2.A1, an obligately aerobic bacterium that grows optimally at pH 9.5 and 65 to 70 C on a wide variety of carbon and energy sources.

  9. The Effect of Ramp Rate on the C49 to C54 Titanium Disilicide Phase Transformation from Ti and Ti(Ta)

    SciTech Connect (OSTI)

    BAILEY, GLENN A.; HU, YAO ZHI; SMITH, PAUL M.; TAY, SING PIN

    1999-09-22

    The C49 to C54 TiSi{sub 2} transformation temperature is shown to be reduced by increasing the ramp rate during rapid thermal processing and this effect is more pronounced for thinner initial Ti and Ti(Ta) films. Experiments were performed on blanket wafers and on wafers that had patterned polycrystalline Si lines with Si{sub 3}N{sub 4} sidewall spacers. Changing the ramp rate caused no change in the transformation temperature for 60 nm blanket Ti films. For blanket Ti films of 25 or 40 nm, however, increasing the ramp rate from 7 to 180 C/s decreased the transformation temperature by 15 C. Studies of patterned lines indicate that sheet resistance of narrow lines is reduced by increased ramp rates for both Ti and Ti(Ta) films, especially as the linewidths decrease below 0.4 {micro}m. This improvement is particularly pronounced for the thinnest Ti(Ta) films, which exhibited almost no linewidth effect after being annealed with a ramp rate of 75 C/s.

  10. Thermodynamic and mechanical stabilities of α- and β-Ta{sub 4}AlC{sub 3} via first-principles investigations

    SciTech Connect (OSTI)

    Thawabi, Hassan S. Duong, Thien Arróyave, Raymundo

    2013-12-07

    Recently, it has been predicted that Ta{sub 4}AlC{sub 3} is likely to exhibit an (α–β) polymorphic transformation at temperatures above 1873 K. However, recent X-ray diffraction and transmission electron microscopy experiments suggest on the other hand that the α phase remains stable up to temperatures close to the limit of experimental capabilities and no transition has yet been observed. While the matter has already been settled experimentally, in this work, we re-investigate the phase stability problem in Ta{sub 4}AlC{sub 3} by using first-principles methods. The study was carried out by considering both thermodynamic and mechanical stabilities of the Ta{sub 4}AlC{sub 3} polymorphs. Particularly, finite-temperature Gibbs free energies and elastic properties of the polymorphs were calculated using density functional theory. Calculation results reveal that the α phase continue to be stable even at temperatures exceeding 1875 K, which is in agreement with experimental results reported in literature.

  11. Structural features and enhanced high-temperature oxygen ion transport in SrFe{sub 1-x}Ta{sub x}O{sub 3-{delta}}

    SciTech Connect (OSTI)

    Markov, Alexey A.; Shalaeva, Elizaveta V.; Tyutyunnik, Alexander P.; Kuchin, Vasily V.; Patrakeev, Mikhail V.; Leonidov, Ilya A.; Kozhevnikov, Victor L.

    2013-01-15

    Structural features, oxygen non-stoichiometry and transport properties are studied in the oxide series SrFe{sub 1-x}Ta{sub x}O{sub 3-{delta}}, where x=0.2, 0.3 and 0.4. X-ray diffraction and electron microscopy data evidence formation of the inhomogeneous materials at x=0.3 and 0.4, which include phase constituents with a cubic perovskite and a double perovskite structure types. The composition, the amount and the typical grain size of the phase inhomogeneities are shown to depend both on doping and oxygen content. The increased oxygen-ion conductivity is observed in oxygen depleted materials, which is explained by the increase in the amount of cubic perovskite-like phase and development of interfacial pathways favorable for enhanced oxygen ion transport. - Graphical abstract: The structural studies, oxygen content and conductivity measurements suggest that oxygen depletion from the double perovskite phase constituent of SrFe{sub 1-x}Ta{sub x}O{sub 3-{delta}} for x>0.2 is accompanied by formation of pathways for fast ion transport. Black-Small-Square Highlights: Black-Right-Pointing-Pointer The double perovskite type regions are shown to exist in SrFe{sub 1-x}Ta{sub x}O{sub 3-{delta}}. Black-Right-Pointing-Pointer The oxygen depletion is accompanied with phase separation. Black-Right-Pointing-Pointer The phase separation favors formation of pathways for enhanced oxygen ion transport.

  12. Synthesis, crystal structure, spectroscopic and thermal properties of [Et{sub 4}N][Ta{sub 6}Br{sub 12}(H{sub 2}O){sub 6}]Br{sub 4}.4H{sub 2}O (Et=ethyl)-A new compound with the paramagnetic [Ta{sub 6}Br{sub 12}]{sup 3+} cluster core

    SciTech Connect (OSTI)

    Peric, Berislav; Jozic, Drazan; Planinic, Pavica; Brnicevic, Nevenka; Giester, Gerald

    2009-09-15

    A new hexanuclear cluster compound, [Et{sub 4}N][Ta{sub 6}Br{sub 12}(H{sub 2}O){sub 6}]Br{sub 4}.4H{sub 2}O (Et=ethyl) (1), with the paramagnetic [Ta{sub 6}Br{sub 12}]{sup 3+} cluster entity, was synthesized and characterized by elemental and TG/DTA analyses, IR and UV/Vis spectroscopy and by a single-crystal X-ray diffraction study. The presence of the paramagnetic [Ta{sub 6}Br{sub 12}]{sup 3+} unit was confirmed also by the room-temperature magnetic and EPR measurements. The compound crystallizes in the tetragonal I4{sub 1}/a space group, with a=14.299(5), c=21.241(5) A, Z=4, R{sub 1}(F)/wR{sub 2}(F{sup 2})=0.0296/0.0811. The structure contains discrete [Ta{sub 6}Br{sub 12}(H{sub 2}O){sub 6}]{sup 3+} cations with an octahedron of metal atoms edge-bridged by bromine atoms and with water molecules occupying all six terminal positions. The cluster units are positioned in the vertices of the three-dimensional (pseudo)diamond lattice. The structure shows similarities with literature reported structures of cluster compounds crystallizing in the diamond (Fd3-barm) space group. - Graphical abstract: Two interpenetrating (pseudo)diamond nets formed by packing of the paramagnetic [Ta{sub 6}Br{sub 12}(H{sub 2}O)]{sup 3+} (octahedral) and diamagnetic [Et{sub 4}N]{sup +} (spheres) cations.

  13. Photocatalytic splitting of water under visible-light irradiation over the NiOx-loaded Sm{sub 2}InTaO{sub 7} with 4f-d{sup 10}-d{sup 0} configuration

    SciTech Connect (OSTI)

    Tang Xinde; Ye Hongqi; Liu Hui; Ma Chenxia; Zhao Zhi

    2010-01-15

    A new visible-light-response photocatalyst Sm{sub 2}InTaO{sub 7} with 4f-d{sup 10}-d{sup 0} configuration crystallized in a cubic system with the space group Fd3m was synthesized by a solid-state reaction method. NiOx-loaded Sm{sub 2}InTaO{sub 7} showed high photocatalytic activities for H{sub 2} evolution from pure water under visible light irradiation (lambda>400 nm). Changes in the photocatalytic activity with the calcination temperature of Sm{sub 2}InTaO{sub 7} and the amount of NiOx loaded indicated that the combination of highly crystallized Sm{sub 2}InTaO{sub 7} and a high dispersion of NiOx particles led to high photocatalytic activity. The high photocatalytic performance of NiOx-loaded Sm{sub 2}InTaO{sub 7} supported the existing view that the photocatalytic activity correlated with the lattice distortion. Density functional theory calculation indicated that strong dispersion from the hybridized In 5s 5p orbitals at the bottom of the conduction band was responsible for the high activity of photocatalyst Sm{sub 2}InTaO{sub 7}. - Graphical abstract: A new visible-light-response photocatalyst Sm{sub 2}InTaO{sub 7} with 4f-d{sup 10}-d{sup 0} configuration was developed. DFT calculation indicated that strong dispersion from the hybridized In 5s 5p orbitals was responsible for the high photocatalytic activity.

  14. NbF{sub 5} and TaF{sub 5}: Assignment of {sup 19}F NMR resonances and chemical bond analysis from GIPAW calculations

    SciTech Connect (OSTI)

    Biswal, Mamata; Body, Monique; Legein, Christophe; Sadoc, Aymeric; Boucher, Florent

    2013-11-15

    The {sup 19}F isotropic chemical shifts (?{sub iso}) of two isomorphic compounds, NbF{sub 5} and TaF{sub 5}, which involve six nonequivalent fluorine sites, have been experimentally determined from the reconstruction of 1D {sup 19}F MAS NMR spectra. In parallel, the corresponding {sup 19}F chemical shielding tensors have been calculated using the GIPAW method for both experimental and DFT-optimized structures. Furthermore, the [M{sub 4}F{sub 20}] units of NbF{sub 5} and TaF{sub 5} being held together by van der Waals interactions, the relevance of Grimme corrections to the DFT optimization processes has been evaluated. However, the semi-empirical dispersion correction term introduced by such a method does not show any significant improvement. Nonetheless, a complete and convincing assignment of the {sup 19}F NMR lines of NbF{sub 5} and TaF{sub 5} is obtained, ensured by the linearity between experimental {sup 19}F ?{sub iso} values and calculated {sup 19}F isotropic chemical shielding ?{sub iso} values. The effects of the geometry optimizations have been carefully analyzed, confirming among other matters, the inaccuracy of the experimental structure of NbF{sub 5}. The relationships between the fluorine chemical shifts, the nature of the fluorine atoms (bridging or terminal), the position of the terminal ones (opposite or perpendicular to the bridging ones), the fluorine charges, the ionicity and the length of the MF bonds have been established. Additionally, for three of the {sup 19}F NMR lines of NbF{sub 5}, distorted multiplets, arising from {sup 1}J-coupling and residual dipolar coupling between the {sup 19}F and {sup 93}Nb nuclei, were simulated yielding to values of {sup 93}Nb{sup 19}F {sup 1}J-coupling for the corresponding fluorine sites. - Graphical abstract: The complete assignment of the {sup 19}F NMR lines of NbF{sub 5} and TaF{sub 5} allow establishing relationships between the {sup 19}F ?{sub iso} values, the nature of the fluorine atoms (bridging or terminal), the position of the terminal ones (opposite or perpendicular to the bridging ones), the fluorine charges, the ionicity and the length of the MF bonds. Display Omitted - Highlights: The {sup 19}F ?{sub iso} values of NbF{sub 5} and TaF{sub 5} have been determined. The {sup 19}F chemical shielding tensors have been calculated using the GIPAW method. A confident assignment of the {sup 19}F NMR lines of NbF{sub 5} and TaF{sub 5} is obtained. The relationships between the {sup 19}F?{sub iso} values and the MF bonds features are established.

  15. Magnetic anisotropy in Ta/CoFeB/MgO investigated by x-ray magnetic circular dichroism and first-principles calculation

    SciTech Connect (OSTI)

    Kanai, Shun; Tsujikawa, Masahito; Shirai, Masafumi; Miura, Yoshio; Matsukura, Fumihiro Ohno, Hideo

    2014-12-01

    We study the spin and orbital magnetic moments in Ta/Co{sub 0.4}Fe{sub 0.4}B{sub 0.2}/MgO by x-ray magnetic circular dichroism measurements as well as first-principles calculations, in order to clarify the origin of the perpendicular magnetic anisotropy. Both experimental and theoretical results show that orbital magnetic moment of Fe is more anisotropic than that of Co with respect to the magnetization direction. The anisotropy is larger for thinner CoFeB, indicating that Fe atoms at the interface with MgO contribute more than Co to the observed perpendicular magnetic anisotropy.

  16. Preparation of W-Ta thin-film thermocouple on diamond anvil cell for in-situ temperature measurement under high pressure

    SciTech Connect (OSTI)

    Yang Jie; Li Ming; Zhang Honglin; Gao Chunxiao

    2011-04-15

    In this paper, a W-Ta thin-film thermocouple has been integrated on a diamond anvil cell by thin-film deposition and photolithography methods. The thermocouple was calibrated and its thermal electromotive force was studied under high pressure. The results indicate that the thermal electromotive force of the thermocouple exhibits a linear relationship with temperature and is not associated with pressure. The resistivity measurement of ZnS powders under high pressure at different temperatures shows that the phase transition pressure decreases as the temperature increases.

  17. Collapse of ferromagnetism in itinerant-electron system: A magnetic, transport properties, and high pressure study of (Hf,Ta)Fe{sub 2} compounds

    SciTech Connect (OSTI)

    Diop, L. V. B. Isnard, O.; Kastil, J.; Arnold, Z.; Kamarad, J.

    2014-10-28

    The magnetism and transport properties were studied for Laves (Hf,Ta)Fe{sub 2} itinerant-electron compounds, which exhibit a temperature-induced first-order transition from the ferromagnetic (FM) to the antiferromagnetic (AFM) state upon heating. At finite temperatures, the field-induced metamagnetic phase transition between the AFM and FM has considerable effects on the transport properties of these model metamagnetic compounds. A large negative magnetoresistance of about 14% is observed in accordance with the metamagnetic transition. The magnetic phase diagram is determined for the Laves Hf{sub 1?x}Ta{sub x}Fe{sub 2} series and its Ta concentration dependence discussed. An unusual behavior is revealed in the paramagnetic state of intermediate compositions, it gives rise to the rapid increase and saturation of the local spin fluctuations of the 3d electrons. This new result is analysed in the frame of the theory of Moriya. For a chosen composition Hf{sub 0.825}Ta{sub 0.175}Fe{sub 2}, exhibiting such remarkable features, a detailed investigation is carried out under hydrostatic pressure up to 1?GPa in order to investigate the volume effect on the magnetic properties. With increasing pressure, the magnetic transition temperature T{sub FM-AFM} from ferromagnetic to antiferromagnetic order decreases strongly non-linearly and disappears at a critical pressure of 0.75?GPa. In the pressure-induced AFM state, the field-induced first-order AFM-FM transition appears and the complex temperature dependence of the AFM-FM transition field is explained by the contribution from both the magnetic and elastic energies caused by the significant temperature variation of the amplitude of the local Fe magnetic moment. The application of an external pressure leads also to the progressive decrease of the Nel temperature T{sub N}. In addition, a large pressure effect on the spontaneous magnetization M{sub S} for pressures below 0.45?GPa, dln(M{sub s})/dP?=??6.3??10{sup ?2?}GPa{sup ?1} was discovered. The presented results are consistent with Moriya's theoretical predictions and can significantly help to better understand the underlying physics of itinerant electron magnetic systems nowadays widely investigated for both fundamental and applications purposes.

  18. g-C{sub 3}N{sub 4}/NaTaO{sub 3} organicinorganic hybrid nanocomposite: High-performance and recyclable visible light driven photocatalyst

    SciTech Connect (OSTI)

    Kumar, Santosh; Kumar, Bharat; Surendar, T.; Shanker, Vishnu

    2014-01-01

    Graphical abstract: High-performance and recyclable visible-light driven g-C{sub 3}N{sub 4}/NaTaO{sub 3} hybrid nanocomposite photocatalysts have been prepared by a facile ultrasonic dispersion method. The hybrid nanocomposite photocatalyst can be promising photocatalytic material for practical application in water splitting and environmental remediation. - Highlights: Novel g-C{sub 3}N{sub 4}/NaTaO{sub 3} nanocomposites as a high performance and recyclable photocatalysts. These catalysts exhibited significantly enhanced photocatalytic activity under UVvisible light irradiation. More attractively, dramatic activity is generated under visible light irradiation due to the g-C{sub 3}N{sub 4} loaded. Interestingly, the as-prepared hybrid nanocomposites possess high reusability. - Abstract: Novel g-C{sub 3}N{sub 4}/NaTaO{sub 3} hybrid nanocomposites have been prepared by a facile ultrasonic dispersion method. Our results clearly show the formation of interface between NaTaO{sub 3} and g-C{sub 3}N{sub 4} and further loading of g-C{sub 3}N{sub 4} did not affect the crystal structure and morphology of NaTaO{sub 3}. The g-C{sub 3}N{sub 4}/NaTaO{sub 3} nanocomposites exhibited enhanced photocatalytic performance for the degradation of Rhodamine B under UVvisible and visible light irradiation compared to pure NaTaO{sub 3} and Degussa P25. Interestingly, the visible light photocatalytic activity is generated due to the loading of g-C{sub 3}N{sub 4}. A mechanism is proposed to discuss the enhanced photocatalytic activity based on trapping experiments of photoinduced radicals and holes. Under visible light irradiation, electron excited from the valance band (VB) to conduction band (CB) of g-C{sub 3}N{sub 4} could directly inject into the CB of NaTaO{sub 3}, making g-C{sub 3}N{sub 4}/NaTaO{sub 3} visible light driven photocatalyst. Since the as-prepared hybrid nanocomposites possess high reusability therefore it can be promising photocatalyst for environmental applications.

  19. Phase transition in the Ruddlesden-Popper layered perovskite Li{sub 2}SrTa{sub 2}O{sub 7}

    SciTech Connect (OSTI)

    Pagnier, T.; Rosman, N.; Galven, C.; Suard, E.; Fourquet, J.L.; Le Berre, F.; Crosnier-Lopez, M.P.

    2009-02-15

    The crystal structure of the Ruddlesden-Popper layered perovskite Li{sub 2}SrTa{sub 2}O{sub 7} has been characterized at various temperatures between -185 and 300 deg. C by several techniques: X-ray and neutron powder diffraction, single crystal diffraction, transmission electron microscopy and Raman spectroscopy. The low temperature structure has been confirmed to be orthorhombic Cmcm with a small octahedra antiphase tilting ({phi}{phi}0) ({phi}{phi}0) inside the perovskite blocks. With temperature, the tilting progressively vanishes leading around 230 deg. C to a tetragonal symmetry (S.G. I4/mmm). This reversible phase transition, followed by X-ray and neutron thermodiffraction and thermal Raman measurements, is considered as of second order. An attribution of the Raman bands based on normal mode analysis is proposed. - Graphical abstract: Thermal evolution of Li{sub 2}SrTa{sub 2}O{sub 7} X-ray powder diffraction patterns showing the structural transformation from orthorhombic to tetragonal cell.

  20. In situ X-ray diffraction strain-controlled study of TiNbZr and TiNbTa shape memory alloys: crystal lattice and transformation features

    SciTech Connect (OSTI)

    Dubinskiy, S.; Prokoshkin, S.; Brailovski, V.; Inaekyan, K.; Korotitskiy, A.

    2014-02-15

    Phase and structure transformations in biomedical Ti21.8Nb6.0Zr (TNZ) and Ti19.7Nb5.8Ta (TNT) shape memory alloys (at.%) under and without load in the ? 150 to 100 S temperature range are studied in situ using an original tensile module for a low-temperature chamber of an X-ray diffractometer. Alpha?- and beta-phase lattice parameters, the crystallographic resource of recovery strain, phase and structure transformation sequences, and microstress appearance and disappearance are examined, compared and discussed. For both alloys, the crystallographic resource of recovery strain decreases with temperature increase to become 4.5% for TNZ and 2.5% for TNT alloy (at RT). Loading at low temperatures leads to additional ??-phase formation and reorientation. Heating under load, as compared to strain-free heating, affects the reverse transformation sequence of both alloys in different ways. For TNZ alloy, strain-free heating results in simultaneous ??? and ???? transformations, whereas during heating under stress, they are sequential: ? + ???? precedes ????. For TNT alloy, strain-free heating results in reverse ???? transformation, whereas during heating under stress, ???? transformation is preceded by ??-phase reorientation. - Highlights: Comparative in situ XRD analysis of TiNbZr(Ta) shape memory alloys is realized. Lattice parameters of ?- and ??-phases are calculated in the ? 150 to + 100 C range. The higher the temperature, the lower the ???? transformation strain. Loading at low temperatures results in ??-phase formation and reorientation. Transformation sequences upon heating with and without loading are different.

  1. Human dose assessment for the radionuclides {sup 90}Sr and {sup 90}Y at TA-35 SWMU 35-003 (r) and Ten Site Canyon

    SciTech Connect (OSTI)

    Jarmer, D.; Lyman, J.

    1997-07-01

    This report gives an estimate of the radiological dose to an individual living on or working at a site contaminated with strontium-90 ({sup 90}Sr) and yttrium-90 ({sup 90}Y). The site consists of a small receiving canyon that drains into Ten-Site Canyon at the eastern end of Los Alamos National Laboratory`s technical area 35 (TA-35). Between 1951 and 1963 a wastewater treatment facility located at TA-35 discharged water containing {sup 90}Sr and {sup 90}Y to this receiving canyon. The authors used the RESRAD computer code to calculate the dose to an on-site individual, based on two exposure scenarios: (1) a person working at the site for eight hours a day, five days a week, for twenty-five years and (2) a farmer living at the site twenty four hours a day, seven days a week, for thirty years. The exposure pathways considered were direct exposure to external radiation; inhalation of contaminated dusts; and ingestion of plants, water, and soil. The authors found that the maximum estimated dose rates were 1 and 21 mrem y{sup {minus}1} for the worker and farmer scenarios respectively. The authors have concluded that the value for the worker scenario is well below the DOE dose limit of 100 mrem y{sup {minus}1} but the farmer is overexposed.

  2. An aqueous route to [Ta6O19]8- and solid-state studies of isostructural niobium and tantalum oxide complexes.

    SciTech Connect (OSTI)

    Nyman, May D.; Anderson, Travis Mark; Alam, Todd M.; Rodriguez, Mark Andrew; Joel N. Bixler; Francois Bonhomme

    2007-10-01

    Tantalate materials play a vital role in our high technology society: tantalum capacitors are found in virtually every cell phone. Furthermore, electronic characteristics and the incredibly inert nature of tantalates renders them ideal for applications such as biomedical implants, nuclear waste forms, ferroelectrics, piezoelectrics, photocatalysts and optical coatings. The inert and insoluble nature of tantalates is not fundamentally understood; and furthermore poor solubility renders fabrication of novel or optimized tantalates very difficult. We have developed a soft chemical route to water-soluble tantalum oxide clusters that can serve as both precursors for novel tantalate materials and ideal models for experimental and computational approaches to understanding the unusually inert behavior of tantalates. The water soluble cluster, [Ta6O19]8- is small, highly symmetric, and contains the representative oxygen types of a metal oxide surface, and thus ideally mimics a complex tantalate surface in a simplistic form that can be studied unambiguously. Furthermore; in aqueous solution, these highly charged and super-basic clusters orchestrate surprising acid-base behavior that most likely plays an important role in the inertness of related oxide surfaces. Our unique synthetic approach to the [Ta6O19]8- cluster allowed for unprecedented enrichment with isotopic labels (17O), enabling detailed kinetic and mechanistic studies of the behavior of cluster oxygens, as well as their acid-base behavior. This SAND report is a collection of two publications that resulted from these efforts.

  3. Joint contributions of Ag ions and oxygen vacancies to conducting filament evolution of Ag/TaO{sub x}/Pt memory device

    SciTech Connect (OSTI)

    Chung, Yu-Lung; Cheng, Wen-Hui; Chen, Wei-Chih; Jhan, Sheng-An; Chen, Jen-Sue; Jeng, Jiann-Shing

    2014-10-28

    The electroforming and resistive switching behaviors in the Ag/TaO{sub x}/Pt trilayer structure are investigated under a continual change of temperatures between 300?K and 100?K to distinguish the contributions of Ag ions and oxygen vacancies in developing of conducting filaments. For either electroforming or resistive switching, a significantly higher forming/set voltages is needed as the device is operated at 100?K, as compared to that observed when operating at 300?K. The disparity in forming/set voltages of Ag/TaO{sub x}/Pt operating at 300?K and 100?K is attributed to the contribution of oxygen vacancies, in addition to Ag atoms, in formation of conducting filament at 100?K since the mobilities of oxygen vacancies and Ag ions become comparable at low temperature. The presence of oxygen vacancy segment in the conducting filament also modifies the reset current from a gradually descending behavior (at 300?K) to a sharp drop (at 100?K). Furthermore, the characteristic set voltage and reset current are irreversible as the operation temperature is brought from 100?K back to 300?K, indicating the critical role of filament constituents on the switching behaviors of Ag/oxide/Pt system.

  4. HUMAN MACHINE INTERFACE (HMI) EVALUATION OF ROOMS TA-50-1-60/60A AT THE RADIOACTIVE LIQUID WASTE TREATMENT FACILITY (RLWTF)

    SciTech Connect (OSTI)

    Gilmore, Walter E.; Stender, Kerith K.

    2012-08-29

    This effort addressed an evaluation of human machine interfaces (HMIs) in Room TA-50-1-60/60A of the Radioactive Liquid Waste Treatment Facility (RLWTF). The evaluation was performed in accordance with guidance outlined in DOE-STD-3009, DOE Standard Preparation Guide for U.S. Department of Energy Nonreactor Nuclear Facility Documented Safety Analyses, 2006 [DOE 2006]. Specifically, Chapter 13 of DOE 2006 highlights the 10 CFR 830, Nuclear Safety Management, 2012, [CFR 2012] and DOE G 421.1-2 [DOE 2001a] requirements as they relate to the human factors process and, in this case, the safety of the RLWTF. The RLWTF is a Hazard Category 3 facility and, consequently, does not have safety-class (SSCs). However, safety-significant SSCs are identified. The transuranic (TRU) wastewater tanks and associated piping are the only safety-significant SSCs in Rooms TA-50-1-60/60A [LANL 2010]. Hence, the human factors evaluation described herein is only applicable to this particular assemblage of tanks and piping.

  5. Effect of the valence electron concentration on the bulk modulus and chemical bonding in Ta{sub 2}AC and Zr{sub 2}AC (A=Al, Si, and P)

    SciTech Connect (OSTI)

    Schneider, Jochen M.; Music, Denis; Sun Zhimei

    2005-03-15

    We have studied the effect of the valence electron concentration, on the bulk modulus and the chemical bonding in Ta{sub 2}AC and Zr{sub 2}AC (A=Al, Si, and P) by means of ab initio calculations. Our equilibrium volume and the hexagonal ratio (c/a) agree well (within 2.7% and 1.2%, respectively) with previously published experimental data for Ta{sub 2}AlC. The bulk moduli of both Ta{sub 2}AC and Zr{sub 2}AC increase as Al is substituted with Si and P by 13.1% and 20.1%, respectively. This can be understood since the substitution is associated with an increased valence electron concentration, resulting in band filling and an extensive increase in cohesion.

  6. Development of a simultaneous Hugoniot and temperature measurement for preheated-metal shock experiments: Melting temperatures of Ta at pressures of 100 GPa

    SciTech Connect (OSTI)

    Li Jun; Zhou Xianming; Li Jiabo; Wu Qiang; Cai Lingcang; Dai Chengda

    2012-05-15

    Equations of state of metals are important issues in earth science and planetary science. A major limitation of them is the lack of experimental data for determining pressure-volume and temperature of shocked metal simultaneously. By measuring them in a single experiment, a major source of systematic error is eliminated in determining from which shock pressure release pressure originates. Hence, a non-contact fast optical method was developed and demonstrated to simultaneously measure a Hugoniot pressure-volume (P{sub H}-V{sub H}) point and interfacial temperature T{sub R} on the release of Hugoniot pressure (P{sub R}) for preheated metals up to 1000 K. Experimental details in our investigation are (i) a Ni-Cr resistance coil field placed around the metal specimen to generate a controllable and stable heating source, (ii) a fiber-optic probe with an optical lens coupling system and optical pyrometer with ns time resolution to carry out non-contact fast optical measurements for determining P{sub H}-V{sub H} and T{sub R}. The shock response of preheated tantalum (Ta) at 773 K was investigated in our work. Measured data for shock velocity versus particle velocity at an initial state of room temperature was in agreement with previous shock compression results, while the measured shock data between 248 and 307 GPa initially heated to 773 K were below the Hugoniot evaluation from its off-Hugoniot states. Obtained interfacial temperatures on release of Hugoniot pressures (100-170 GPa) were in agreement with shock-melting points at initial ambient condition and ab initio calculations of melting curve. It indicates a good consistency for shock melting data of Ta at different initial temperatures. Our combined diagnostics for Hugoniot and temperature provides an important approach for studying EOS and the temperature effect of shocked metals. In particular, our measured melting temperatures of Ta address the current controversy about the difference by more than a factor of 2 between the melting temperatures measured under shock and those measured in a laser-heated diamond anvil cell at {approx}100 GPa.

  7. Lattice-level observation of the elastic-to-plastic relaxation process with subnanosecond resolution in shock-compressed Ta using time-resolved in situ Laue diffraction

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Wehrenberg, C. E.; Comley, A. J.; Barton, N. R.; Coppari, F.; Fratanduono, D.; Huntington, C. M.; Maddox, B. R.; Park, H. -S.; Plechaty, C.; Prisbrey, S. T.; et al

    2015-09-29

    We report direct lattice level measurements of plastic relaxation kinetics through time-resolved, in-situ Laue diffraction of shock-compressed single-crystal [001] Ta at pressures of 27-210 GPa. For a 50 GPa shock, a range of shear strains is observed extending up to the uniaxial limit for early data points (<0.6 ns) and the average shear strain relaxes to a near steady state over ~1 ns. For 80 and 125 GPa shocks, the measured shear strains are fully relaxed already at 200 ps, consistent with rapid relaxation associated with the predicted threshold for homogeneous nucleation of dislocations occurring at shock pressure ~65 GPa.more » The relaxation rate and shear stresses are used to estimate the dislocation density and these quantities are compared to the Livermore Multiscale Strength model as well as various molecular dynamics simulations.« less

  8. Integrated quasi-phase-matched second-harmonic generator and electrooptic scanner on LiTaO{sub 3} single crystals

    SciTech Connect (OSTI)

    Gopalan, V.; Kawas, M.J.; Schlesinger, T.E.; Stancil, D.D.; Gupta, M.C.

    1996-12-01

    The authors report the first integrated quasi-phase-matched second-harmonic generator and electrooptic scanner on ferroelectric Z-cut LiTaO{sub 3}. The quasi-phase-matched second-harmonic generation device frequency doubles the infrared light at 829.7 nm into blue at 414.85 nm with a bulk conversion efficiency of 0.52%/W-cm. The blue light generated in the bulk then passes through an electrooptic scanner, consisting of a series of lithographically defined triangular-shaped domain-inverted regions extending through the thickness of the crystal. A deflection of 12 mrad/kv for the output blue light and 7.4 mrad/kv for the infrared light was observed at the scanner output.

  9. Multiple copies of orbital angular momentum states through second-harmonic generation in a two-dimensional periodically poled LiTaO{sub 3} crystal

    SciTech Connect (OSTI)

    Fang, Xinyuan; Wei, Dunzhao; Liu, Dongmei; Zhong, Weihao; Ni, Rui; Chen, Zhenhua; Hu, Xiaopeng; Zhang, Yong Zhu, S. N.; Xiao, Min

    2015-10-19

    We experimentally demonstrate multiple copies of optical orbital angular momentum (OAM) states through quasi-phase-matched (QPM) second-harmonic (SH) generation in a 2D periodically poled LiTaO{sub 3} (PPLT) crystal. Since the QPM condition is satisfied by involving different reciprocal vectors in the 2D PPLT crystal, collinear and noncollinear SH beams carrying OAMs of l{sub 2} are simultaneously generated by the input fundamental beam with an OAM of l{sub 1}. The OAM conservation law (i.e., l{sub 2} = 2l{sub 1}) holds well in the experiment, which can tolerate certain phase-mismatch between the interacting waves. Our results provide an efficient way to obtain multiple copies of the wavelength-converted OAM states, which can be used to enhance the capacity in optical communications.

  10. Manipulation of electronic and magnetic properties of M{sub 2}C (M = Hf, Nb, Sc, Ta, Ti, V, Zr) monolayer by applying mechanical strains

    SciTech Connect (OSTI)

    Zhao, Shijun; Kang, Wei; Xue, Jianming

    2014-03-31

    Tuning the electronic and magnetic properties of a material through strain engineering is an effective strategy to enhance the performance of electronic and spintronic devices. In this paper, first-principles calculations based on density functional theory are carried out to investigate the electronic and magnetic properties of M{sub 2}C(M = Hf, Nb, Sc, Ta, Ti, V, Zr, known as MXenes) subjected to biaxial symmetric mechanical strains. At the strain-free state, all these MXenes exhibit no spontaneous magnetism except for Ti{sub 2}C and Zr{sub 2}C which show a magnetic moment of 1.92 and 1.25 μ{sub B}/unit, respectively. As the tensile strain increases, the magnetic moments of MXenes are greatly enhanced and a transition from nonmagnetism to ferromagnetism is observed for those nonmagnetic MXenes at zero strains. The most distinct transition is found in Hf{sub 2}C, in which the magnetic moment is elevated to 1.5 μ{sub B}/unit at a strain of 1.80%. We further show that the magnetic properties of Hf{sub 2}C are attributed to the band shift mainly composed of Hf(5d) states.

  11. Multiphoton photoluminescence contrast in switched Mg:LiNbO{sub 3} and Mg:LiTaO{sub 3} single crystals

    SciTech Connect (OSTI)

    Reichenbach, P., E-mail: philipp.reichenbach@iapp.de; Kmpfe, T.; Thiessen, A.; Haumann, A.; Eng, L. M. [Institut fr Angewandte Photophysik, Technische Universitt Dresden, George-Bhr-Str. 1, 01069 Dresden (Germany); Woike, T. [Institut fr Strukturphysik, Technische Universitt Dresden, Zellescher Weg 16, 01069 Dresden (Germany)

    2014-09-22

    We observed a multiphoton luminescence contrast between virgin and single-switched domains in Mg-doped LiNbO{sub 3} (LNO) and LiTaO{sub 3} (LTO) single crystals with different doping levels of 07?mol. % and 08?mol. %, respectively. A luminescence contrast in the range of 3% was measured between as-grown and electrically inverted domain areas in Mg:LNO samples, while the contrast reaches values of up to 30% for the Mg:LTO case. Under annealing, an exponential decay of the domain contrast was observed. The activation energy of about 1?eV being determined for the decay allowed a comparison with reported activation energies of associated defects, clearly illustrating a strong connection between thermal contrast decay and the H{sup +} and Li{sup +}-ion mobility. Finally, performing similar experiments on oxidized samples undoubtedly demonstrated that the origin of the reported luminescence contrast is strongly connected with lithium ions.

  12. Influence of ball milling on atomic structure and magnetic properties of Co{sub 40}Fe{sub 22}Ta{sub 8}B{sub 30} glassy alloy

    SciTech Connect (OSTI)

    Taghvaei, Amir Hossein, E-mail: Amirtaghvaei@gmail.com [Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz (Iran, Islamic Republic of); Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz (Iran, Islamic Republic of); Stoica, Mihai [IFW Dresden, Institute for Complex Materials, Helmholtzstr. 20, 01069 Dresden (Germany); Politehnica University of Timisoara, P-ta Victoriei 2, Timisoara (Romania); Bednar?ik, Jozef [HASYLAB at DESY, Notkestrasse 85, 22603 Hamburg (Germany); Kaban, Ivan [IFW Dresden, Institute for Complex Materials, Helmholtzstr. 20, 01069 Dresden (Germany); TU Dresden, Institut fr Werkstoffwissenschaft, 01062 Dresden (Germany); Shahabi, Hamed Shakur; Khoshkhoo, Mohsen Samadi [IFW Dresden, Institute for Complex Materials, Helmholtzstr. 20, 01069 Dresden (Germany); Janghorban, Kamal [Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz (Iran, Islamic Republic of); Eckert, Jrgen [IFW Dresden, Institute for Complex Materials, Helmholtzstr. 20, 01069 Dresden (Germany); TU Dresden, Institut fr Werkstoffwissenschaft, 01062 Dresden (Germany)

    2014-06-01

    The influence of ball milling on the atomic structure and magnetic properties of the Co{sub 40}Fe{sub 22}Ta{sub 8}B{sub 30} metallic glass with a high thermal stability and excellent soft magnetic properties has been investigated. After 14 h of milling, the obtained powders were found to consist mainly of an amorphous phase and a small fraction of the (Co,Fe){sub 21}Ta{sub 2}B{sub 6} nanocrystals. The changes in the reduced pair correlation functions suggest noticeable changes in the atomic structure of the amorphous upon ball milling. Furthermore, it has been shown that milling is accompanied by introduction of compressive and dilatational sites in the glassy phase and increasing the fluctuation of the atomic-level hydrostatic stress without affecting the coordination number of the nearest neighbors. Ball milling has decreased the thermal stability and significantly affected the magnetic properties through increasing the saturation magnetization, Curie temperature of the amorphous phase and coercivity. - Highlights: Ball milling affected the atomic structure of Co{sub 40}Fe{sub 22}Ta{sub 8}B{sub 30} metallic glass. Mechanically-induced crystallization started after 4 h milling. Milling increased the fluctuation of the atomic-level hydrostatic stress in glass. Ball milling influenced the thermal stability and magnetic properties.

  13. Effect of the oxide layer on current-induced spin-orbit torques in Hf|CoFeB|MgO and Hf|CoFeB|TaO{sub x} structures

    SciTech Connect (OSTI)

    Akyol, Mustafa; Alzate, Juan G.; Yu, Guoqiang; Upadhyaya, Pramey; Wong, Kin L.; Khalili Amiri, Pedram; Wang, Kang L.; Ekicibil, Ahmet

    2015-01-19

    We study the effect of the oxide layer on the current-induced spin-orbit torques (SOTs) in perpendicularly magnetized Hf|CoFeB|MgO (MgO-capped) or Hf|CoFeB|TaO{sub x} (TaO{sub x}-capped) structures. The effective fields corresponding to both the field-like and damping-like current-induced SOTs are characterized using electric transport measurements. Both torques are found to be significantly stronger in MgO-capped structures than those in TaO{sub x}-capped structures. The difference in field-like and damping-like SOTs in the different structures may be attributed to the different Rashba-like Hamiltonian, arising from the difference in the electric potential profiles across the oxide|ferromagnet interfaces in the two cases, as well as possible structural and oxidation differences in the underlying CoFeB and Hf layers. Our results show that the oxide layer in heavy-metal|ferromagnet|oxide trilayer structures has a very significant effect on the generated SOTs for manipulation of ferromagnetic layers. These findings could potentially be used to engineer SOT devices with enhanced current-induced switching efficiency.

  14. Structural and magnetic properties of pyrochlore solid solutions (Y,Lu){sub 2}Ti{sub 2-x}(Nb,Ta){sub x}O{sub 7{+-}}{sub y}

    SciTech Connect (OSTI)

    West, D.V. McQueen, T.M.; Huang, Q.; Cava, R.J.

    2008-08-15

    The synthesis and characterization of the pyrochlore solid solutions, Y{sub 2}Ti{sub 2-x}Nb{sub x}O{sub 7-y}, Lu{sub 2}Ti{sub 2-x}Nb{sub x}O{sub 7-y}, Y{sub 2}Ti{sub 2-x}Ta{sub x}O{sub 7-y} and Lu{sub 2}TiTaO{sub 7-y} (-0.4Ta){sup 5+} combination, as opposed to Ti{sup 4+}/(Nb,Ta){sup 4+}, in this pyrochlore family. In addition, the evidence clearly points to Ti{sup 3+} as the source of the localized moments, with no evidence for localized Nb{sup 4+} moments. - Graphical abstract: Synthesis of pyrochlore solid solutions (Y,Lu){sub 2}Ti{sub 2-x}(Nb,Ta){sub x}O{sub 7{+-}}{sub y} under high vacuum at 1600 deg. C results in oxygen deficient, paramagnetic compounds with reduced B-site cations. Studies indicate Ti{sup 3+} as the source of the localized moments, with no evidence for localized Nb{sup 4+} moments. Annealing under O{sub 2} results in fully oxidized, oxygen excess pyrochlores as white powders. Powder neutron diffraction studies show the excess oxygen on the normally vacant 8a site.

  15. Preliminary Assessment for CAU 485: Cactus Spring Ranch Pu and Du Site, CAS No. TA-39-001-TAGR: Soil Contamination, Tonapah Test Range, Nevada

    SciTech Connect (OSTI)

    ITLV

    1998-07-01

    Corrective Action Unit 485, Corrective Action Site TA-39-001-TAGR, the Cactus Spring Ranch Soil Contamination Area, is located approximately six miles southwest of the Area 3 Compound at the eastern mouth of Sleeping Column Canyon in the Cactus Range on the Tonopah Test Range. This site was used in conjunction with animal studies involving the biological effects of radionuclides (specifically plutonium) associated with Operation Roller Coaster. According to field records, a hardened layer of livestock feces ranging from 2.54 centimeters (cm) (1 inch [in.]) to 10.2 cm (4 in.) thick is present in each of the main sheds. IT personnel conducted a field visit on December 3, 1997, and noted that the only visible feces were located within the east shed, the previously fenced area near the east shed, and a small area southwest of the west shed. Other historical records indicate that other areas may still be covered with animal feces, but heavy vegetation now covers it. It is possible that radionuclides are present in this layer, given the history of operations in this area. Chemicals of concern may include plutonium and depleted uranium. Surface soil sampling was conducted on February 18, 1998. An evaluation of historical documentation indicated that plutonium should not be and depleted uranium could not be present at levels significantly above background as the result of test animals being penned at the site. The samples were analyzed for isotopic plutonium using method NAS-NS-3058. The results of the analysis indicated that plutonium levels of the feces and surface soil were not significantly elevated above background.

  16. 14 CX TA-16.pdf

    National Nuclear Security Administration (NNSA)

  17. Preliminary Assessment for CAU 485: Cactus Spring Ranch Pu and DU Site CAS No. TA-39-001-TAGR: Soil Contamination, Tonopah Test Range, Nevada

    SciTech Connect (OSTI)

    1998-07-01

    Corrective Action Unit 485, Corrective Action Site TA-39-001-TAGR, the Cactus Spring Ranch Soil Contamination Area, is located approximately six miles southwest of the Area 3 Compound at the eastern mouth of Sleeping Column Canyon in the Cactus Range on the Tonopah Test Range. This site was used in conjunction with animal studies involving the biological effects of radionuclides (specifically plutonium) associated with Operation Roofer Coaster. The location had been used as a ranch by private citizens prior to government control of the area. According to historical records, Operation Roofer Coaster activities involved assessing the inhalation uptake of plutonium in animals from the nonnuclear detonation of nuclear weapons. Operation Roofer Coaster consisted of four nonnuclear destruction tests of a nuclear device. The four tests all took place during May and June 1963 and consisted of Double Tracks and Clean Slate 1, 11, and 111. Eighty-four dogs, 84 burros, and 136 sheep were used for the Double Tracks test, and ten sheep and ten dogs were used for Clean Slate 11. These animals were housed at Cactus Spring Ranch. Before detonation, all animals were placed in cages and transported to the field. After the shot, they were taken to the decontamination area where some may have been sacrificed immediately. All animals, including those sacrificed, were returned to Cactus Spring Ranch at this point to have autopsies performed or to await being sacrificed at a later date. A description of the Cactus Spring Ranch activities found in project files indicates the ranch was used solely for the purpose of the Roofer Coaster tests and bioaccumulation studies and was never used for any other project. No decontamination or cleanup had been conducted at Cactus Spring Ranch prior to the start of the project. When the project was complete, the pits at Cactus Spring Ranch were filled with soil, and trailers where dogs were housed and animal autopsies had been performed were removed. Additional pens and sheds were built to house and manage livestock involved with the Operation Roofer Coaster activities in 1963.

  18. Current-induced spin-orbit torque switching of perpendicularly magnetized Hf|CoFeB|MgO and Hf|CoFeB|TaO{sub x} structures

    SciTech Connect (OSTI)

    Akyol, Mustafa; Yu, Guoqiang; Alzate, Juan G.; Upadhyaya, Pramey; Li, Xiang; Wong, Kin L.; Khalili Amiri, Pedram; Wang, Kang L.; Ekicibil, Ahmet

    2015-04-20

    We study the effect of the oxide layer on current-induced perpendicular magnetization switching properties in Hf|CoFeB|MgO and Hf|CoFeB|TaO{sub x} tri-layers. The studied structures exhibit broken in-plane inversion symmetry due to a wedged CoFeB layer, resulting in a field-like spin-orbit torque (SOT), which can be quantified by a perpendicular (out-of-plane) effective magnetic field. A clear difference in the magnitude of this effective magnetic field (H{sub z}{sup FL}) was observed between these two structures. In particular, while the current-driven deterministic perpendicular magnetic switching was observed at zero magnetic bias field in Hf|CoFeB|MgO, an external magnetic field is necessary to switch the CoFeB layer deterministically in Hf|CoFeB|TaO{sub x}. Based on the experimental results, the SOT magnitude (H{sub z}{sup FL} per current density) in Hf|CoFeB|MgO (?14.12?Oe/10{sup 7} A cm{sup ?2}) was found to be almost 13 larger than that in Hf|CoFeB|TaO{sub x} (?1.05?Oe/10{sup 7} A cm{sup ?2}). The CoFeB thickness dependence of the magnetic switching behavior, and the resulting ?H{sub z}{sup FL} generated by in-plane currents are also investigated in this work.

  19. Band alignment of epitaxial SrTiO3 thin films with (LaAlO3)0.3-(Sr2AlTaO6)0.7 (001)

    SciTech Connect (OSTI)

    Comes, Ryan B.; Xu, Peng; Jalan, Bharat; Chambers, Scott A.

    2015-09-28

    SrTiO3 (STO) epitaxial thin films and heterostructures are of considerable interest due to the wide range of functionalities they exhibit. The alloy perovskite (LaAlO3)0.3-(Sr2AlTaO6)0.7 (LSAT) is commonly used as a substrate for these material structures due to its structural compatibility. However, surprisingly little is known about the electronic properties of the STO/LSAT interface despite its potentially important role in affecting the overall electronic structure of system. We examine the band alignment of STO/LSAT heterostructures using x-ray photoelectron spectroscopy for epitaxial STO films deposited using two different molecular beam epitaxy approaches. We find that the valence band offset ranges from +0.2(1) eV to -0.2(1) eV depending on surface conditions for the film and substrate. From these results we extract a conduction band offset from -2.4(1) eV to -2.8(1) eV, indicating that the conduction band edge is more deeply bound in STO and that LSAT will not act as a sink or trap for electrons in the supported film or multilayer.

  20. Synthesis and characterization of compounds Sr{sub 2}{ital RM}Cu{sub 2}O{sub 8{minus}{delta}} ({ital R}=Pr, Nd, Sm, Eu, Gd; {ital M}=Nb, Ta)

    SciTech Connect (OSTI)

    Vybornov, M.; Perthold, W.; Michor, H.; Holubar, T.; Hilscher, G.; Rogl, P.; Fischer, P.; Divis, M.

    1995-07-01

    Although traces of superconductivity ({lt}0.2%) have been detected in Ba{sub 2}La{ital M}{sub 1{minus}{ital x}}W{sub {ital x}}Cu{sub 2}O{sub 8{minus}{delta}} ({ital x}{similar_to}0.3,{ital M}=Nb,Ta) below 30 K, the superconducting impurity phase could not be resolved. The antiferromagnetic (AF) order of the rare-earth sublattice in this {ital R}-2112 system (e.g., {ital T}{sub {ital N}}{sup Gd}=2.18 K) appears to be similar to that of the {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} series (e.g., {ital T}{sub {ital N}}{sup Gd}=2.29 K); however, the exceptional high AF order of Pr in Pr-123 (with 17 K) is reduced to below 2.3 K for Sr{sub 2}Pr{ital M} Cu{sub 2}O{sub 8{minus}{delta}}. The temperature and field dependence of the specific heat and the susceptibility is discussed in terms of crystal field splitting derived from the {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} compounds. Overall crystal field splitting in the title compounds is comparable with that of the {ital R}-123 compounds.

  1. Investigation into the evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals under variations in temperature

    SciTech Connect (OSTI)

    Borisov, S. A.; Vakhrushev, S. B.; Koroleva, E. Yu.; Naberezhnov, A. A. Syrnikov, P. P.; Simkin, V. G.; Kutnjak, Z.; Egami, T.; Dmowski, W.; Piekarz, P.

    2007-05-15

    The evolution of the structure of K{sub 1-x}Li{sub x}Ta{sub 1-y}Nb{sub y}O{sub 3} single crystals with x = 0.001, y = 0.026, and 1900 ppm Cu (KLTN277) and with x = 0.0014 and y = 0.024 (KLTN123), which exhibit an extremely high permittivity (up to 4 x 10{sup 5} in the quasi-static regime for the KLTN277 crystal), is investigated in the range from room temperature to 20 K. It is demonstrated that, upon cooling to the lowest temperatures, both crystals retain their cubic structure, but the lattice parameters pass through a minimum at the temperature of the observed anomalies of the dielectric response ({approx}50 K). In the neutron diffraction pattern of the KLTN123 sample, satellites appear in the vicinity of the (hhh) reflections at temperatures below {approx}50 K. These satellites can be associated with the nucleation of the rhombohedral phase.

  2. Excitation functions of the natTa(p,x)178m2Hf and natW(p,x)178m2Hf reactions at energies up to 2600 MeV

    SciTech Connect (OSTI)

    Titarenko, Yu. E.; Batyaev, V. F.; Pavlov, K. V.; Titarenko, A. Yu.; Zhivun, V. M.; Chauzova, M. V.; Ignatyuk, A. V.; Mashnik, Stepan Georgievich; Leray, S.; Boudard, A.; David, J. -C.; Mancusi, D.; Cugnon, J.; Yariv, Y.; Nishihara, K.; Matsuda, N.; Kumawat, H.; Stankovskiy, A. Yu.

    2015-04-29

    Due to potential level of energy intensity 178m2Hf is an extremely interesting isomer. One possible way to produce this isomer is irradiation of natTa or natW samples with high energy protons. Irradiation of natTa or natW samples performed for other purposes provides an opportunity to study the corresponding reactions. This paper presents the 178m2Hf independent production cross sections for both targets measured by the gamma-ray spectrometry method. The reaction excitation functions have been obtained for the proton energies from 40 up to 2600 MeV. The experimental results were compared with calculations by various versions of the intranuclear cascade model in the well-known codes: ISABEL, Bertini, INCL4.5+ABLA07, PHITS, CASCADE07 and CEM03.02. The isomer ratio for the natTa(p,x) 178m2Hf reaction is evaluated on the basis of the available data.

  3. COMET TA Floor Plan 100225.vc6

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

    West Hall Door Emg Exit W Trench Room 1107 S Structural Beam Rack Argus Chamber Interaction Chamber Work Station 8 3 0 2 - V B L as phere CL 420mm f rom N i nner wall. Lens h...

  4. 13 CX TA-55-4.pdf

    National Nuclear Security Administration (NNSA)

  5. Addressing concerns related to geologic hazards at the site of the proposed Transuranic Waste Facility , TA-63, Los Alamos National Laboratory: focus on the current Los Alamos Seismic Network earthquake catalog, proximity of identified seismic events to the proposed facility , and evaluation of prev

    SciTech Connect (OSTI)

    Roberts, Peter M.; Schultz-Fellenz, Emily S.; Kelley, Richard E.

    2012-04-02

    This technical paper presents the most recent and updated catalog of earthquakes measured by the Los Alamos Seismic Network at and around Los Alamos National Laboratory (LANL), with specific focus on the site of the proposed transuranic waste facility (TWF) at Technical Area 63 (TA-63). Any questions about the data presented herein, or about the Los Alamos Seismic Network, should be directed to the authors of this technical paper. LANL and the Los Alamos townsite sit atop the Pajarito Plateau, which is bounded on its western edge by the Pajarito fault system, a 35-mile-long system locally comprised of the down-to-the-east Pajarito fault (the master fault) and subsidiary down-to-the-west Rendija Canyon, Guaje Mountain, and Sawyer Canyon faults (Figure 1). This fault system forms the local active western margin of the Rio Grande rift near Los Alamos, and is potentially seismogenic (e.g., Gardner et al., 2001; Reneau et al., 2002; Lewis et al., 2009). The proposed TWF area at TA-63 is situated on an unnamed mesa in the north-central part of LANL between Twomile Canyon to the south, Ten Site Canyon to the north, and the headwaters of Canada del Buey to the east (Figure 2). The local bedrock is the Quaternary Bandelier Tuff, formed in two eruptive pulses from nearby Valles caldera, the eastern edge of which is located approximately 6.5 miles west-northwest of the technical area. The older member (Otowi Member) of the Bandelier Tuff has been dated at 1.61 Ma (Izett and Obradovich 1994). The younger member (Tshirege Member) of the Bandelier Tuff has been dated at 1.256 Ma (age from Phillips et al. 2007) and is widely exposed as the mesa-forming unit around Los Alamos. Several discrete cooling units comprise the Tshirege Member. Commonly accepted stratigraphic nomenclature for the Tshirege Member is described in detail by Broxton and Reneau (1995), Gardner et al. (2001), and Lewis et al. (2009). The Tshirege Member cooling unit exposed at the surface at TA-63 is Qbt3. Understanding the subtle differences between Tshirege Member cooling units and the nature of the contacts between cooling units is critical to identifying the presence or absence of faults associated with the Pajarito fault system on the Pajarito Plateau. The Los Alamos Seismic Network (LASN) continuously monitors local earthquake activity in the Los Alamos area in support of LANL's Seismic Hazards program. Seismic monitoring of LANL facilities is a requirement of DOE Order 420.1B (Facility Safety). LASN currently consists of nine permanent seismic instrument field stations that telemeter real-time sensitive ground motion data to a central recording facility. Four of these stations are located on LANL property, with three of those within 2.5 miles of TA-63. The other five stations are in remote locations in the Jemez Mountains, Valles Caldera, St Peters Dome, and the Caja del Rio plateau across the Rio Grande from the Los Alamos area. Local earthquakes are defined as those with locations within roughly 100 miles of Los Alamos. Plate 1 shows the current LASN station locations and all local earthquakes recorded from 1973 through 2011. During this time period, LASN has detected and recorded over 850 local earthquakes in north-central New Mexico. Over 650 of these were located within about 50 miles of Los Alamos, and roughly 60 were within 10 miles. The apparent higher density of earthquakes close to Los Alamos, relative to the rest of north-central New Mexico, is due largely to the fact that LASN is a sensitive local seismic network, recording many very small nearby events (magnitude less than 1.0) that are undetectable at greater distances.

  6. Dual-phase Cr-Ta alloys for structural applications

    DOE Patents [OSTI]

    Liu, Chain T.; Brady, Michael P.; Zhu, Jiahong; Tortorelli, Peter F.

    2001-01-01

    Dual phase alloys of chromium containing 2 to 11 atomic percent tantalum with minor amounts of Mo, Cr, Ti, Y, La, Cr, Si and Ge are disclosed. These alloys contain two phases including Laves phase and Cr-rich solid solution in either eutectic structures or dispersed Laves phase particles in the Cr-rich solid solution matrix. The alloys have superior mechanical properties at high temperature and good oxidation resistance when heated to above 1000.degree. C. in air.

  7. Damping Ring R&D at CESR-TA

    SciTech Connect (OSTI)

    Rubin, David

    2015-01-23

    Accelerators that collide high energy beams of matter and anti-matter are essential tools for the investigation of the fundamental constituents of matter, and the search for new forms of matter and energy. A “Linear Collider” is a machine that would bring high energy and very compact bunches of electrons and positrons (anti-electrons) into head-on collision. Such a machine would produce (among many other things) the newly discovered Higgs particle, enabling a detailed study of its properties. Among the most critical and challenging components of a linear collider are the damping rings that produce the very compact and intense beams of electrons and positrons that are to be accelerated into collision. Hot dilute particle beams are injected into the damping rings, where they are compressed and cooled. The size of the positron beam must be reduced more than a thousand fold in the damping ring, and this compression must be accomplished in a fraction of a second. The cold compact beams are then extracted from the damping ring and accelerated into collision at high energy. The proposed International Linear Collider (ILC), would require damping rings that routinely produce such cold, compact and intense beams. The goal of the Cornell study was a credible design for the damping rings for the ILC. Among the technical challenges of the damping rings; the development of instrumentation that can measure the properties of the very small beams in a very narrow window of time, and mitigation of the forces that can destabilize the beams and prevent adequate cooling, or worse lead to beam loss. One of the most pernicious destabilizing forces is due to the formation of clouds of electrons in the beam pipe. The electron cloud effect is a phenomenon in particle accelerators in which a high density of low energy electrons, build up inside the vacuum chamber. At the outset of the study, it was anticipated that electron cloud effects would limit the intensity of the positron ring, and that an instability associated with residual gas in the beam pipe would limit the intensity of the electron ring. It was also not clear whether the required very small beam size could be achieved. The results of this study are important contributions to the design of both the electron and positron damping rings in which all of those challenges are addressed and overcome. Our findings are documented in the ILC Technical Design Report, a document that represents the work of an international collaboration of scientists. Our contributions include design of the beam magnetic optics for the 3 km circumference damping rings, the vacuum system and surface treatments for electron cloud mitigation, the design of the guide field magnets, design of the superconducting damping wigglers, and new detectors for precision measurement of beam properties. Our study informed the specification of the basic design parameters for the damping rings, including alignment tolerances, magnetic field errors, and instrumentation. We developed electron cloud modelling tools and simulations to aid in the interpretation of the measurements that we carried out in the Cornell Electron-positron Storage Ring (CESR). The simulations provide a means for systematic extrapolation of our measurements at CESR to the proposed ILC damping rings, and ultimately to specify how the beam pipes should be fabricated in order to minimize the effects of the electron cloud. With the conclusion of this study, the design of the essential components of the damping rings is complete, including the development and characterization (with computer simulations) of the beam optics, specification of techniques for minimizing beam size, design of damping ring instrumentation, R&D into electron cloud suppression methods, tests of long term durability of electron cloud coatings, and design of damping ring vacuum system components.

  8. TPA_M-091_Final_Approved_TA.pdf

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

  9. TA-55 Hot CMM Calibration Tolerance Analysis (U)

    SciTech Connect (OSTI)

    Montano, Joshua D. [Los Alamos National Laboratory

    2012-06-12

    The Hot Coordinate Measuring Machine (CMM), a Brown and Sharpe Xcel 765, has specifications listed by the manufacture of 4.5 + L/250 {micro}m for volumetric performance, 3.5 {micro}m for probing and 4.5 {micro}m for scanning. An upgrade was performed on the machine increasing its performance capability. This document reviews calibration data gathered after the upgrade over a five year period (2005-2010) and recommends a new specification of 3.0 + L/250 {micro}m for size, 3.3 {micro}m for probing, and 4.3 {micro}m for scanning. The new equations are an approximate 30% increase in accuracy for size and approximately 5% increase for probing and scanning.

  10. Microsoft PowerPoint - TA-21_LASO_Rhodes

    Office of Environmental Management (EM)

    Land Use Case Study for Technical Area Land Use Case Study for Technical Area- -21 at 21 at Los Alamos National Laboratory Los Alamos National Laboratory Residential or Industrial Cleanup Standards Residential or Industrial Cleanup Standards Los Alamos Site Office 1 David S. Rhodes, Supervisory Federal Project Director Environmental Restoration Projects and Decontamination and Decommissioning Team Los Alamos Site Office Regulations Regulations Public Law 105-119, Title VI, Section 632 -

  11. Materials Data on Ta2Te2O9 (SG:14) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  12. Optical spectroscopy of the Weyl semimetal TaAs (Technical Report...

    Office of Scientific and Technical Information (OSTI)

    Los Alamos National Lab. (LANL), Los Alamos, NM (United States) Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics Publication Date: 2016-03-28 OSTI Identifier: ...

  13. Materials Data on CaTa4O11 (SG:182) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  14. Materials Data on TaBiO4 (SG:52) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  15. Materials Data on TaO2F (SG:131) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  16. Materials Data on CsTaN2 (SG:122) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  17. Materials Data on Ta5N6 (SG:193) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-04-10

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  18. Technical Area (TA)-54 Area G Nitrate-Salt Waste Container Response...

    Office of Environmental Management (EM)

    during the Department of Energy Accident Investigation Board's investigation into ... More Documents & Publications Accident Investigation Report - Radiological Release Tritium ...

  19. Materials Data on TaHO3 (SG:141) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  20. perturbation Peyser, T.A.; Murray, S.D.; Farley, D.R.; Logory...

    Office of Scientific and Technical Information (OSTI)

    These experiments were performed using the Nova laser. Measurements of the time-evolution of the mixing region were reported previously. We compared the experimental...

  1. CESR Conversion Damping Ring Studies of Electron Cloud Instabilities (CESR-TA)

    SciTech Connect (OSTI)

    Rubin, David L.; Palmer, Mark A.

    2011-08-02

    In the International Linear Collider, two linear accelerators will accelerate bunches of positrons and electrons to over a hundred billion electron volts and collide them in a central detector. In order to obtain useful collision rates, the bunches, each containing twenty billion particles, must be compressed to a cross section of a few nanometers by a few hundred nanometers. In order to prepare these ultra high density bunches, damping rings (DRs) are employed before the linear accelerators. The DRs take the high emittance bunches that are provided by the electron and positron sources and, through the process of radiation damping, squeeze them into ultra low emittance beams that are ready for the main linear accelerators. In the damping rings, a number of effects can prevent the successful preparation of the beams. In the electron ring, an effect known as the fast ion instability can lead to beam growth and, in the positron ring, the build-up of an electron cloud (EC), which interacts with the circulating bunches, can produce the same effect. EC build-up and the subsequent interaction of the cloud with the positron beam in the DR have been identified as major risks for the successful construction of a linear collider. The CESRTA research program at the Cornell Electron Storage Ring (CESR) was developed in order to study the build-up of the EC, the details of its impact on ultra low emittance beams, as well as methods to mitigate the impact of the cloud. In the DR, the EC forms when synchrotron photons radiated from the circulating beam strike the walls of the vacuum chamber, resulting in the emission of photoelectrons. These low energy electrons can be accelerated across the vacuum chamber by the electric field of the beam, and strike the walls, causing the emission of secondary electrons. The secondary electrons are subsequently accelerated into the walls yet again via the same mechanism. The result is that the EC can rapidly begin to fill the vacuum chamber. In an electron DR, the EC build-up is limited by the Coulomb repulsion. But in a positron ring, the electrons are pulled into the potential well of the beam. The resulting interaction of the circulating bunches of positrons with the EC that ultimately limits DR performance. Typically we store long trains of closely space bunches in the damping ring. The interaction of stored beam and the EC that is generated by the long train is manifested by different mechanisms: (1) The cloud focuses the beam, which causes a tune shift that increases along the bunch train as the cloud density increases. (2) The cloud electrons couple the motion of bunches along a train. Transverse motion of a leading bunch is transferred to the cloud, and subsequently to a trailing bunch which can result in a multi-bunch instability. (3) The cloud couples the positrons in the head of the bunch to those in the tail of the same bunch, which can excite a 'head-tail' instability. (4) The nonlinear fields of the EC can lead to emittance growth before the onset of instabilities. The CESRTA collaboration, which includes researchers from Cornell University's Laboratory for Elementary-Particle Physics as well as more than 50 senior staff members from over a dozen accelerator laboratories and universities around the world, has operated CESR as a damping ring for the past three years to study these EC effects. A range of specialized instrumentation has been deployed to study the local build-up of the cloud in the vacuum chambers as well as the complicated dynamics exhibited when the beam and the EC interact. The program has significantly advanced our understanding of these issues and has helped identify the most promising methods to mitigate the impact of the EC on the DR beams. It has pointed the way towards a DR design that can meet the stringent specifications of the ILC.

  2. Materials Data on Ta(TeBr3)2 (SG:2) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  3. Materials Data on Ta7(Te12I5)2 (SG:2) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  4. Materials Data on Ta3(Se4Br3)2 (SG:2) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-03-19

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  5. Materials Data on Ta(TeCl3)2 (SG:2) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  6. Technical Area (TA)-54 Area G Nitrate-Salt Waste Container Response Instructions

    Broader source: Energy.gov [DOE]

    Supporting Technical Document for the Radiological Release Accident Investigation Report (Phase II Report)

  7. Materials Data on Ta2Se8I (SG:97) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-03-09

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  8. Materials Data on Ta2I5 (SG:1) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  9. Phase report 1C, TA-21 operable unit RCRA Facility Investigation, Outfalls Investigation

    SciTech Connect (OSTI)

    Not Available

    1994-02-28

    This phase report summarizes the results of field investigations conducted in 1992 at Technical Area 21 of Los Alamos National Laboratory, as prescribed by the RCRA Facility Investigation work plan for the Technical Area 21 operable unit (also known as OU 1106). This phase report is the last part of a three-part phase report describing the results of field work conducted in 1992 at this operable unit. Phase Report lA, issued on l4 June l993, summarized site geologic characterization activities. Phase report 1B, issued on 28 January 1994, included an assessment of site-wide surface soil background, airborne emissions deposition, and contamination in the locations of two former air filtration buildings. The investigations assessed in Phase Report 1C include field radiation surveys and surface and near-surface sampling to characterize potential contamination at 25 outfalls and septic systems listed as SWMUs in the RFI work plan. Based on the RFI data, it is recommended that no further action is warranted for 8 SWMUs and further action is recommended for 3 SWMUs addressed in this phase report. For 14 SWMUs which represent no immediate threat to human health or environment, deferral of further action/no further action decisions is recommended until outstanding analytical data are received, sampling of adjacent SWMUs is completed, or decisions are made about the baseline risk assessment approach.

  10. Materials Data on Ta2CrO6 (SG:14) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  11. Materials Data on Sr2TaCrO6 (SG:225) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  12. Materials Data on Ba2TaCrO6 (SG:194) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  13. Materials Data on Ta2CrO6 (SG:136) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-02-09

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  14. Preparation of W-Ta thin-film thermocouple on diamond anvil cell...

    Office of Scientific and Technical Information (OSTI)

    Resource Relation: Journal Name: Review of Scientific Instruments; Journal Volume: 82; Journal Issue: 4; Other Information: (c) 2011 American Institute of Physics; Country of ...

  15. Materials Data on TaFeO4 (SG:33) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  16. Materials Data on BaLaMgTaO6 (SG:216) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  17. Materials Data on Cs2TaS6 (SG:164) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  18. Materials Data on NaCaTaTiO6 (SG:7) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  19. Materials Data on TaRu (SG:123) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  20. Elimination of liquid discharge to the environment from the TA-50 Radioactive Liquid Waste Treatment Facility

    SciTech Connect (OSTI)

    Moss, D.; Williams, N.; Hall, D.; Hargis, K.; Saladen, M.; Sanders, M.; Voit, S.; Worland, P.; Yarbro, S.

    1998-06-01

    Alternatives were evaluated for management of treated radioactive liquid waste from the radioactive liquid waste treatment facility (RLWTF) at Los Alamos National Laboratory. The alternatives included continued discharge into Mortandad Canyon, diversion to the sanitary wastewater treatment facility and discharge of its effluent to Sandia Canyon or Canada del Buey, and zero liquid discharge. Implementation of a zero liquid discharge system is recommended in addition to two phases of upgrades currently under way. Three additional phases of upgrades to the present radioactive liquid waste system are proposed to accomplish zero liquid discharge. The first phase involves minimization of liquid waste generation, along with improved characterization and monitoring of the remaining liquid waste. The second phase removes dissolved salts from the reverse osmosis concentrate stream to yield a higher effluent quality. In the final phase, the high-quality effluent is reused for industrial purposes within the Laboratory or evaporated. Completion of these three phases will result in zero discharge of treated radioactive liquid wastewater from the RLWTF.

  1. Materials Data on TaBe12 (SG:139) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  2. Materials Data on TaMn2 (SG:194) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-01-27

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  3. Technology Solutions Case Study: Ground Source Heat Pump Research, TaC Studios Residence, Atlanta, Georigia

    SciTech Connect (OSTI)

    2014-09-01

    This case study describes the construction of a new test home that demonstrates current best practices for the mixed-humid climate, including a high performance ground source heat pump for heating and cooling, a building envelope featuring advanced air sealing details and low-density spray foam insulation, and glazing that exceeds ENERGY STAR requirements.

  4. Materials Data on TaAlCo2 (SG:225) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  5. Materials Data on TaGaCo2 (SG:225) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  6. Materials Data on TaPd3 (SG:139) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  7. Materials Data on TaPd2 (SG:71) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  8. Materials Data on TaS2 (SG:194) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-02-09

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  9. Materials Data on K2TaF7 (SG:14) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  10. Materials Data on K2TaCl6 (SG:225) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  11. Materials Data on K9Ta10O30 (SG:2) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  12. Materials Data on K2Ta3Cl9 (SG:12) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  13. T.A.; Coomer, C.L.; Campbell, S.L.; Wereszczak, A.A.; Cunningham...

    Office of Scientific and Technical Information (OSTI)

    S.L.; Wereszczak, A.A.; Cunningham, J.P.; Marlino, L.D.; Seiber, L.E.; Lin, H.T. 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ECONOMICS; EVALUATION; FEEDBACK;...

  14. Materials Data on Ta3SBr7 (SG:8) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  15. Materials Data on TaCuS3 (SG:62) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  16. Materials Data on TaS3 (SG:11) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-02-19

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  17. Materials Data on BaLaTaMnO6 (SG:216) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2015-04-15

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  18. Materials Data on Ba3Ta5O15 (SG:127) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2015-03-07

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  19. Materials Data on TaMn2 (SG:194) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  20. Materials Data on TaBe12 (SG:139) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  1. Materials Data on TaAlCo2 (SG:225) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-02-09

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  2. Materials Data on TaGaCo2 (SG:225) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-03-09

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  3. Magnetic anisotropy in Ta/CoFeB/MgO investigated by x-ray magnetic...

    Office of Scientific and Technical Information (OSTI)

    AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; BORON ALLOYS; COBALT; COBALT ALLOYS; IRON; IRON ALLOYS; MAGNESIUM OXIDES; MAGNETIC CIRCULAR...

  4. Radionuclide concentrations in honey bees from Area G at TA-54 during 1997. Progress report

    SciTech Connect (OSTI)

    Haarmann, T.K.; Fresquez, P.R.

    1998-07-01

    Honey bees were collected from two colonies located at Los Alamos National Laboratory`s Area G, Technical Area 54, and from one control (background) colony located near Jamez Springs, NM. Samples were analyzed for the following: cesium ({sup 137}Cs), americium ({sup 241}Am), plutonium ({sup 238}Pu and {sup 239,240}Pu), tritium ({sup 3}H), total uranium, and gross gamma activity. Area G sample results from both colonies were higher than the upper (95%) level background concentration for {sup 238}Pu and {sup 3}H.

  5. Materials Data on U2Ta6O19 (SG:193) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-02-09

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  6. Structural and compositional variations in Ta{sub 3}N{sub 5}...

    Office of Scientific and Technical Information (OSTI)

    3Nsub 5 produced by high-temperature ammonolysis of tantalum oxide Citation Details In-Document Search Title: Structural and compositional variations in Tasub 3Nsub 5 ...

  7. Materials Data on Ta2FeO6 (SG:136) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  8. Materials Data on Sr2TaFeO6 (SG:14) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  9. Materials Data on TaAgF6 (SG:132) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  10. EA-1962: Analysis for Below Grade Suspect Transuranic (TRU) Waste at Technical Area (TA)-54

    Broader source: Energy.gov [DOE]

    DOE is preparing an EA to evaluate the legacy suspect transuranic (TRU) waste at Area G for the purposes of reclassification of waste type and determination of a final disposal path. Per DOE Order 435.1, Change 1, Radioactive Waste Management, and its associated guide, legacy waste at Los Alamos National Laboratory that contained TRU waste was stored and managed as TRU waste. The waste was given an interim classification for the purposes of applying the most restrictive standard until the waste could be adequately characterized and a final determination on the disposition classification was made.

  11. Materials Data on TaIr3 (SG:221) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2015-03-09

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  12. Microsoft Word - 00 Cover Page CP Change Forms TA as of 3-18...

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

    ... Stream 685, 222-U Building Stormwater Runoff InjectionReverse Well 200-W-108 200-W-108, Miscellaneous Stream 687, 222-U Building Stormwater Runoff InjectionReverse Well ...

  13. Materials Data on Ba3Ta2NiO9 (SG:164) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  14. Materials Data on Ta2NiO6 (SG:136) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  15. Materials Data on Ta9VO25 (SG:82) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  16. Materials Data on TaVO5 (SG:62) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  17. Materials Data on Ta2VO6 (SG:136) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  18. Memo- Legacy Technical Area (TA)-55 Nitrate Salt Wastes at TA-54, Potential Applicability of Resource Conservation and Recovery Act (RCRA) D001/D002/D003 Waste Codes

    Broader source: Energy.gov [DOE]

    Supporting Technical Document for the Radiological Release Accident Investigation Report (Phase II Report)

  19. Oil country tubular goods from Argentina, Austria, Italy, Japan, Korea, Mexico, and Spain. Investigations Nos. 701-ta-363 and 364 (final) and investigations nos. 731-ta-711-717 (final)

    SciTech Connect (OSTI)

    1995-08-01

    Based on the record in these final investigations, we determine that an industry in the United States is materially injured by reason of imports of oil country tubular goods excluding drill pipe (also referred to herein as `casing and tubing`) from Argentina, Italy, Japan, Korea, and Mexico that are sold in the United States is materially injured by (`LTFV`). We also determine that an industry in the United States is materially injured by reason of subsidized imports of casing and tubing from Italy. We find that an industry in the United States is not materially injured or threatened with material injury by reason of imports of casing and tubing from Austria and Spain that are sold at LTFV or subsidized. We further determine that an industry in the United States is threatened with material injury by reason of imports of drill pipe from Argentina, Japan, and Mexico that are sold at LTFV. We determine that we would not have made an affirmative material injury determination but for the suspension of liquidation. Finally, we unanimously determine that an industry in the United States is neither materially injured nor threatened with material injury by reason of LFTV or subsidized imports of drill pipe from Austria, Italy, Korea, or Spain.

  20. Materials Data on Ba10Ta10(N3O7)3 (SG:47) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  1. Materials Data on Na3Sr7Ta3Ti7O30 (SG:6) by Materials Project

    SciTech Connect (OSTI)

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  2. EA-1407: Proposed TA-16 Engineering Complex Refurbishment and Consolidation at Los Alamos National Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts for the proposal to construct and operate offices, laboratories, and shops within the U.S. Department of Energy Los Alamos National Laboratory's (LANL)...

  3. Materials Data on TaSi2PH18C6(NCl3)2 (SG:14) by Materials Project

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Kristin Persson

    2014-11-02

    Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

  4. Synthesis of low loss, thermally stable Ce{sub x}Y{sub 1-x}TiTaO...

    Office of Scientific and Technical Information (OSTI)

    10.1016j.materresbull.2008.06.005; PII: S0025-5408(08)00207-9; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input:...

  5. Broadband terahertz time-domain spectroscopy of ferroelectric LiTaO{sub 3}: Phonon-polariton dispersion

    SciTech Connect (OSTI)

    Kojima, Seiji Mori, Tatsuya

    2014-11-05

    The lowest frequency IR active A{sub 1}(z) and E(x) modes of a ferroelectric congruent lithium tantalate crystal were studied by the broadband polarized Terahertz Time-Domain Spectroscopy using the coherent THz radiation from 0.2 to 6.5 THz. The dispersion relations of the real and imaginary parts of a polariton wave vector were determined from the complex extraordinary and ordinary refractive indices for the A{sub 1}(z) and E(x) symmetry phonon-polaritons, respectively. The observed complex dispersion relations of two symmetries are in agreement within the experimental uncertainty with the calculated dispersion curves by the damped harmonic oscillator model.

  6. Building America Technology Solutions for New and Existing Homes: Ground Source Heat Pump Research, TaC Studios Residence, Atlanta, Georigia (Fact Sheet),

    Office of Energy Efficiency and Renewable Energy (EERE)

    This case study describes the construction of a new test home in Atlanta, GA, that demonstrates current best practices for the mixed-humid climate, including a building envelope featuring advanced air sealing details and low density spray foam insulation, glazing that exceeds ENERGY STAR requirements, and a high performance heating and cooling system.

  7. Crystal structure and antiferromagnetic ordering of quasi-2D [Cu(HF{sub 2})(pyz){sub 2}]TaF{sub 6} (pyz = pyrazine).

    SciTech Connect (OSTI)

    Manson, J. L.; Schlueter, J. A.; McDonald, R. D.; Singleton, J.; Materials Science Division; Eastern Washington Univ.; LANL

    2010-04-01

    The crystal structure of the title compound was determined by X-ray diffraction at 90 and 295 K. Copper(II) ions are coordinated to four bridging pyz ligands to form square layers in the ab-plane. Bridging HF{sub 2}{sup -} ligands join the layers together along the c-axis to afford a tetragonal, three-dimensional (3D) framework that contains Taf{sub 6}{sup -} anions in every cavity. At 295 K, the pyz rings lie exactly perpendicular to the layers and cooling to 90 K induces a canting of those rings. Magnetically, the compound exhibits 2D antiferromagnetic correlations within the 2D layers with an exchange interaction of -13.1(1) K. Weak interlayer interactions, as mediated by Cu-F-H-F-Cu, leads to long-range magnetic order below 4.2 K. Pulsed-field magnetization data at 0.5 K show a concave curvature with increasing B and reveal a saturation magnetization at 35.4 T.

  8. EA-0874: Low-level Waste Drum Staging Building at Weapons Engineering Tritium Facility, TA-16 Los Alamos National Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts of a proposal to place a 3 meter (m) by 4.5 m prefabricated storage building (transportainer) adjacent to the existing Weapons Engineering Tritium...

  9. Sol-gel type synthesis of Bi.sub.2 (Sr,Ta.sub.2)O.sub.9 using an acetate based system

    DOE Patents [OSTI]

    Boyle, Timothy J.

    1997-01-01

    A method of forming a layered-perovskite bismuth-strontium-tantalum oxide (SBT) ferroelectric material is performed by dissolving a bismuth compound in a first solvent to form a first solution, mixing a strontium compound and a tantalum compound to form a binary mixture, dissolving the binary mixture in a second solvent to form a second solution, mixing the first solution with the second solution to form a SBT precursor solution, evaporating the first and second solvents to form a SBT precursor material and subsequently sintering said SBT precursor material in the presence of oxygen.

  10. Sol-gel type synthesis of Bi{sub 2}(Sr,Ta{sub 2})O{sub 9} using an acetate based system

    DOE Patents [OSTI]

    Boyle, T.J.

    1997-11-04

    A method of forming a layered-perovskite bismuth-strontium-tantalum oxide (SBT) ferroelectric material is performed by dissolving a bismuth compound in a first solvent to form a first solution, mixing a strontium compound and a tantalum compound to form a binary mixture, dissolving the binary mixture in a second solvent to form a second solution, mixing the first solution with the second solution to form a SBT precursor solution, evaporating the first and second solvents to form a SBT precursor material and subsequently sintering said SBT precursor material in the presence of oxygen. 6 figs.

  11. Segregation and Influence of Boron on the impact toughness of Ti-6 Pct AI-2 Pct Nb-1 Pct Ta0. 8 Pct Mo welds and castings

    SciTech Connect (OSTI)

    Inouye, H.; Davis, S.A.

    1984-07-01

    Trace levels of boron (>0.0010 pct) lowered the impact toughness of welds and castings of Ti-6211. Because the boron effect is also observed in titanium and other titanium alloys, determining the embrittling mechanism is the objective of a continuing study. This study indicates that impaired toughness may result from preferential segregation of boron to the grain boundaries and/or refinement of the ..cap alpha.. + ..beta.. colony microstructure.

  12. Waste Management Committee Fiscal Year 2013 Work Plan | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    3 Work Plan Waste Management Committee Fiscal Year 2013 Work Plan Topics: TA-21 TA-54 RiskBenefit Principles TA-49 Fiscal Year 2012 Budget PDF icon WM-FY13-WP - September 26, 2012 ...

  13. December 2015 Newsletter - Los Alamos Field Office Legacy Cleanup |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy December 2015 Newsletter - Los Alamos Field Office Legacy Cleanup December 2015 Newsletter - Los Alamos Field Office Legacy Cleanup December 31, 2015 - 12:00pm Addthis Sewage Treatment Facility at TA-21 before demolition Sewage Treatment Facility at TA-21 before demolition Debris from demolition of TA-21 Sewage Treatment Facility Debris from demolition of TA-21 Sewage Treatment Facility Sewage Treatment Facility at TA-21 before demolition Debris from demolition of TA-21

  14. SecuritySmart

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

    House); * TA-00, Bldg. 760 (Legal Counsel); and * TA-3, Bldg. 1411 (Occupational Medicine). All other buildings in non-secure areas must be individually accounted for in...

  15. CRAD, Occupational Safety & Health - Los Alamos National Laboratory...

    Office of Environmental Management (EM)

    & Health - Los Alamos National Laboratory TA 55 SST Facility CRAD, Occupational Safety & Health - Los Alamos National Laboratory TA 55 SST Facility A section of Appendix C to DOE...

  16. U.S. Geological Survey Open-File Report 99-310

    National Nuclear Security Administration (NNSA)

    r e d fr om Gr a v i t y D a ta , Ne va da Test Si te , N e va da by G.A. Phelps 1 , V.E. ... Figure 1. Map showing simplified geology of the Nevada Test Site region. White, Cenozoic ...

  17. Multi-component solid solution alloys having high mixing entropy

    DOE Patents [OSTI]

    Bei, Hongbin

    2015-10-06

    A multi-component high-entropy alloy includes a composition selected from the following group: VNbTaTiMoWRe, VNbTaTiMoW, VNbTaTiMoRe, VNbTaTiWRe, VNbTaMoWRe, VNbTiMoWRe, VTaTiMoWRe, NbTaTiMoWRe, VNbTaTiMo, VNbTaTiW, VNbTaMoW, VNbTiMoW, VTaTiMoW, NbTaTiMoW, VNbTaTiRe, VNbTaMoRe, VNbTiMoRe, VTaTiMoRe, NbTaTiMoRe, VNbTaWRe, VNbTiWRe, VTaTiWRe, NbTaTiWRe, VNbMoWRe, VTaMoWRe, NbTaMoWRe, VTiMoWRe, NbTiMoWRe, TaTiMoWRe, wherein relative amounts of each element vary by no more than .+-.15 atomic %.

  18. Directions_Crossroads_Facilities

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

    staftertheintersectionwithCanyonRd,acrossfromRidgeview Veterinary. Bybus(fromTA-3): AtomicCityTransithastworoute...

  19. Enterprise Assessments Targeted Review of the Targeted Review of the Safety Significant Ventilation System and Interconnected Portions of the Associated Safety Class Confinement System, and Review of Federal Assurance Capability at LANL TA-55

    Broader source: Energy.gov [DOE]

    Targeted Review of the Safety Significant Ventilation System and Interconnected Portions of the Associated Safety Class Confinement System, and Review of Federal Assurance Capability at the Los Alamos National Laboratory Technical Area 55 Plutonium Facility

  20. Study of optical properties of asymmetric bipolar pulse DC magnetron sputtered Ta{sub 2}O{sub 5} thin film as a function of oxygen content in deposition ambient

    SciTech Connect (OSTI)

    Haque, S. Maidul Shinde, D. D. Misal, J. S.; Bhattacharyya, D.; Sahoo, N. K.

    2014-04-24

    Tantalum penta-oxide thin films have been deposited by reactive sputtering technique using asymmetric bipolar pulsed DC source at various oxygen percentage viz. 0 to 50 %. The optical properties of the films have been studied by spectroscopic ellipsometry measurements. It has been observed that compact films with low void fraction, high refractive index and band gap can be obtained by the above technique with oxygen percentage in the range of 30–40%. The films deposited with zero or very low oxygen content have high deposition rate and yield metal rich films with large voids, defects, low band gap and high refractive index. Similarly films deposited with >40% oxygen content again contain voids and defects due to the presence of large amount of gas molecules in the sputtering ambient.

  1. Book review of Insect Symbiosis. Volume 2. Bourtzis, K.A. and Miller, T.A. editros. 2006 CRC Press, Taylor and Francis Group, Boca Raton, FL, 276 pp. ISBN 0-8493-1286-8

    SciTech Connect (OSTI)

    Hoy, M.A. [Department of Entomology and Nematology, University of Florida, Gainesville, FL (United States)

    2007-03-15

    There are several definitions of symbiosis, but in this book it involves an association where one organism (the symbiont) lives within or on the body of another organism (the host), regardless of the actual effect on the host. Some symbioses are mutualistic, some parasitic, and some involve commensalism, in which one partner derives some benefit without either harming or benefiting the other. This is the second volume in this exciting and rapidly advancing topic by these editors. The first volume was published in 2003 and during the intervening three years additional data have been produced that make this book a useful addition to your library. The first book provided chapters that provided an overview of insect symbiosis, discussions of the primary aphid symbiont Buchnera and other aphid symbionts, symbiosis in tsetse, symbionts in the weevil Sitophilus , the possible use of paratransgenic symbionts of Rhodnius prolixis to prevent disease transmission, bark beetle and fungal symbiosis, symbionts of tephritid fruit flies, symbionts affecting termite behavior, an overview of microsporidia as symbionts (parasites?) of insects, an overview of a newly discovered bacterium that causes sex-ratio distortion in insects and mites (from the Bacteroides group), symbionts that selectively kill male insects, and several chapters on the ubiquitous endosymbiont Wolbachia.

  2. A=12C (1975AJ02)

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

    1973TR1B, 1973UL1B, 1974AR1G, 1974BE1R, 1974BO2K, 1974DA1N, 1974LA1J, 1974LA1K, 1974PA1E, 1974SC1F, 1974SN1B, 1974TO1C, 1974WI1F, 1975FA1H, 1975TA1E). Muon and neutrino...

  3. Pressure-induced ferroelectric to paraelectric transition in

    Office of Scientific and Technical Information (OSTI)

    LiTaO[subscript 3] and (Li,Mg)TaO[subscript 3] (Journal Article) | SciTech Connect SciTech Connect Search Results Journal Article: Pressure-induced ferroelectric to paraelectric transition in LiTaO[subscript 3] and (Li,Mg)TaO[subscript 3] Citation Details In-Document Search Title: Pressure-induced ferroelectric to paraelectric transition in LiTaO[subscript 3] and (Li,Mg)TaO[subscript 3] Authors: Yamanaka, Takamitsu ; Nakamoto, Yuki ; Takei, Fumihiko ; Ahart, Muhtar ; Mao, Ho-kwang ; Hemley,

  4. Energetica Serra da Prata | Open Energy Information

    Open Energy Info (EERE)

    da Prata Jump to: navigation, search Name: Energetica Serra da Prata Place: Bahia, Brazil Product: SHP developer based in the state of Bahia, Brazil. References: Energetica Serra...

  5. Building America Case Study: Ground Source Heat Pump Research...

    Energy Savers [EERE]

    Ground Source Heat Pump Research, TaC Studios Residence Atlanta, Georgia PROJECT ... TaC Studios, an Atlanta-based architecture frm, learned these lessons during design and ...

  6. EA-1962: Analysis for Below Grade Suspect Transuranic (TRU) Waste...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    62: Analysis for Below Grade Suspect Transuranic (TRU) Waste at Technical Area (TA)-54 EA-1962: Analysis for Below Grade Suspect Transuranic (TRU) Waste at Technical Area (TA)-54...

  7. Exploratory research on mutagenic activity of coal-related materials

    SciTech Connect (OSTI)

    Warshawsky, D.; Schoeny, R. S.

    1980-01-01

    The following samples were found to be mutagenic for strains TA1538, TA98 and TA100 Salmonella typhimurium: ETTM-10, ETTM-11, ETTM-15, ETTM-16, and ETTM-17. ETTM-13 was marginally mutagenic for TA1537. ETTM-14 was slightly mutagenic for TA1537, TA1538, and TA98. Mutagenicity by all samples was demonstrated only in the presence of hepatic enzyme extracts (S9) which provided metabolic activation. ETTM-11 was shown to be the most mutagenic sample assayed thus far; specific activity was 2.79 x 10/sup 4/ TA98 revertants/mg sample. Fractionation by serial extractions with increasingly polar organic solvents was done at least 2 x with ETTM-10, ETTM-11, ETTM-15, ETTM-16 and ETTM-17. For some samples highly mutagenic fractions were observed.

  8. EIS-0281-SA-03: Supplement Analysis | Department of Energy

    Office of Environmental Management (EM)

    EIS-0281-SA-03: Supplement Analysis Installation of a Petawatt Laser System in TA-IV ...New Mexico Installation of a Petawatt Laser System in TA-IV, DOEEIS-0281-SA-03 ...

  9. Waste Management Committee Fiscal Year 2012 Work Plan | Department...

    Office of Environmental Management (EM)

    Management Committee Fiscal Year 2012 Work Plan Waste Management Committee Fiscal Year 2012 Work Plan Topics: TA-21 TA-54 RiskBenefit Principles Consent Order PDF icon WM-FY12-WP...

  10. Observation of magnon-mediated current drag in Pt/yttrium iron...

    Office of Scientific and Technical Information (OSTI)

    Observation of magnon-mediated current drag in Ptyttrium iron garnetPt(Ta) trilayers Title: Observation of magnon-mediated current drag in Ptyttrium iron garnetPt(Ta) trilayers ...

  11. Microsoft Word - November2015draft.docx

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

    On t he L ab's p roperty, nine s ites have b een identified for inclusion within the Park. Gun S ite F acilities: TA--- 8 --- 1 Laboratory a nd S hop, TA--- 8 --- 2 S hop a nd ...

  12. CX-002690: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Pajarito Road Right-Of-Way Shift at TA-50 and TA-55CX(s) Applied: B1.13Date: 04/21/2010Location(s): New MexicoOffice(s): Los Alamos Site Office

  13. Sandia National Laboratories: Page Title

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

    softening steel. April 2014 2013 Density Functional Theory (DFT) provides ab-initio, electronica structure based predictions of elastic-plastic constants in Ta, W, and Ta-W alloys....

  14. Audit Report: OAS-M-07-02

    Broader source: Energy.gov [DOE]

    Management Controls over the National Nuclear Security Administration's Ability to Maintain Capability of the TA-18 Mission

  15. Deactivation and Decommissioning | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Services » Deactivation and Decommissioning Deactivation and Decommissioning TA-21-286 being demolished TA-21-286 being demolished The EM-LA Deactivation and Decommissioning (D&D) Team is dedicated to demolishing, deactivating and disposing material from historical buildings at Los Alamos National Laboratory. Current workscope is focused on Technical Area 21 (TA-21), one of the early sites of the Manhattan Project and Cold War-era work conducted at LANL. TA-21 was the location of the

  16. EA-1407: Final Environmental Assessment

    Broader source: Energy.gov [DOE]

    Proposed TA-16 Engineering Complex Refurbishment and Consolidation at Los Alamos National Laboratory, Los Alamos, New Mexico

  17. EA-1407: Finding of No Significant Impact

    Broader source: Energy.gov [DOE]

    Proposed TA-16 Engineering Complex Refurbishment and Consolidation at Los Alamos National Laboratory, Los Alamos, New Mexico

  18. Radioactive Liquid Waste Treatment Facility Discharges in 2014

    SciTech Connect (OSTI)

    Del Signore, John C.

    2015-07-14

    This report documents radioactive discharges from the TA50 Radioactive Liquid Waste Treatment Facilities (RLWTF) during calendar 2014.

  19. A=18O (72AJ02)

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

    for 18O) GENERAL: See also (59AJ76) and Table 18.1 Table of Energy Levels (in PDF or PS). Shell model:(WI57H, TA60L, HO62A, TA62, TA62D, HA63A, PA63C, SA63B, CO64B, IN64,...

  20. ATTACHMENT N

    Office of Environmental Management (EM)

    N FIGURES List of Figures for Permit Figure 1: LANL Regional Location Map Figure 2: LANL Facility Boundary and Technical Area (TA)-Specific Map Figure 3: LANL Facility Boundary with Detail of Non-LANL Areas Figure 4: TA-3 Security Fences, Entry Gates, and Entry Stations Figure 5: Reserved Figure 6: TA-50 Security Fences, Entry Gates, and Entry Stations Figure 7: TA-54, Area L, Security Fences, Entry Gates, and Entry Stations Figure 8: TA-54, Area G, Security Fences, Entry Gates, and Entry

  1. Biopalma da Amaz nia | Open Energy Information

    Open Energy Info (EERE)

    da Amaznia Place: Belem, Para, Brazil Product: Brazilian palm oil plantation for food industry developer company. Coordinates: -1.454426, -48.502537 Show Map Loading...

  2. The energetics of lanthanum tantalate materials

    SciTech Connect (OSTI)

    Forbes, Tori Z.; Nyman, May; Rodriguez, Mark A.; Navrotsky, Alexandra

    2010-11-15

    Lanthanum tantalates are important refractory materials with application in photocatalysis, solid oxide fuel cells, and phosphors. Soft-chemical synthesis utilizing the Lindqvist ion, [Ta{sub 6}O{sub 19}]{sup 8-}, has yielded a new phase, La{sub 2}Ta{sub 2}O{sub 7}(OH){sub 2}. Using the hydrated phase as a starting material, a new lanthanum orthotantalate polymorph was formed by heating to 850 {sup o}C, which converts to a previously reported LaTaO{sub 4} polymorph at 1200 {sup o}C. The stabilities of La{sub 2}Ta{sub 2}O{sub 7}(OH){sub 2} (LaTa-OH), the intermediate LaTaO{sub 4} polymorph (LaTa-850), and the high temperature phase (LaTa-1200) were investigated using high-temperature oxide melt solution calorimetry. The enthalpy of formation from the oxides were calculated from the enthalpies of drop solution to be -87.1{+-}9.6, -94.9{+-}8.8, and -93.1{+-}8.7 kJ/mol for LaTa-OH, LaTa-850, and LaTa-1200, respectively. These results indicate that the intermediate phase, LaTa-850, is the most stable. This pattern of energetics may be related to cation-cation repulsion of the tantalate cations. We also investigated possible LnTaO{sub 4} and Ln{sub 2}Ta{sub 2}O{sub 7}(OH){sub 2} analogues of Ln=Pr, Nd to examine the relationship between cation size and the resulting phases. - Graphical abstract: The energetics of three lanthanum tantalates were investigated by the high-temperature oxide melt solution calorimetry. The enthalpies of formation from the oxides were calculated from the enthalpies of drop solution to be -87.1{+-}9.6, -94.9{+-}8.8, and -93.1{+-}8.7 kJ/mol for La{sub 2}Ta{sub 2}O{sub 7}(OH){sub 2}, LaTaO{sub 4} (850 {sup o}C), and LaTaO{sub 4} (1200 {sup o}C), respectively. These results indicate that the intermediate phase, LaTaO{sub 4} (850 {sup o}C), is the most stable in energy. Display Omitted

  3. A=8He (1988AJ01)

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

    8AJ01) (See the Isobar Diagram for 8He) GENERAL: See also (1984AJ01) and Table 8.1 [Table of Energy Levels] (in PDF or PS). Model calculations: (1984VA06, 1985PO10, 1987BL18). Complex reactions involving 8He: (1982AL33, 1983AN13, 1985MA13, 1985TA1D, 1986SA30, 1987AR1G, 1987BO40, 1987KO1Z, 1987PE1C, 1987TAZU, 1988GA10, 1988ST06, 1988TA1A). Hypernuclei: (1982KA1D, 1983DO1B, 1984BO1H, 1985AH1A, 1985IK1A, 1986BA1W, 1986DA1B, 1987MI38, 1987PO1H). Other topics: (1983GL1B, 1985AN28, 1987AJ1A,

  4. Eolica Cajueiro da Praia Ltda | Open Energy Information

    Open Energy Info (EERE)

    Eolica Cajueiro da Praia Ltda Jump to: navigation, search Name: Eolica Cajueiro da Praia Ltda Place: Fortaleza, Ceara, Brazil Zip: 60170-251 Sector: Renewable Energy, Wind energy...

  5. Mercado Abastecedor da Regiao de Lisboa MARL | Open Energy Information

    Open Energy Info (EERE)

    Mercado Abastecedor da Regiao de Lisboa MARL Jump to: navigation, search Name: Mercado Abastecedor da Regiao de Lisboa (MARL) Place: Lisbon, Portugal Zip: 2660-421 Product: Mercado...

  6. Incubadora de Empresas da Universidade de Aveiro IEUA | Open...

    Open Energy Info (EERE)

    Incubadora de Empresas da Universidade de Aveiro IEUA Jump to: navigation, search Name: Incubadora de Empresas da Universidade de Aveiro (IEUA) Place: Portugal Sector: Services...

  7. DA (Distribution Automation) (Smart Grid Project) | Open Energy...

    Open Energy Info (EERE)

    DA (Distribution Automation) (Smart Grid Project) Jump to: navigation, search Project Name DA (Distribution Automation) Country Netherlands Coordinates 52.132633, 5.291266...

  8. Single walled carbon nanotube networkTetrahedral amorphous carbon composite film

    SciTech Connect (OSTI)

    Iyer, Ajai Liu, Xuwen; Koskinen, Jari; Kaskela, Antti; Kauppinen, Esko I.; Johansson, Leena-Sisko

    2015-06-14

    Single walled carbon nanotube network (SWCNTN) was coated by tetrahedral amorphous carbon (ta-C) using a pulsed Filtered Cathodic Vacuum Arc system to form a SWCNTNta-C composite film. The effects of SWCNTN areal coverage density and ta-C coating thickness on the composite film properties were investigated. X-Ray photoelectron spectroscopy measurements prove the presence of high quality sp{sup 3} bonded ta-C coating on the SWCNTN. Raman spectroscopy suggests that the single wall carbon nanotubes (SWCNTs) forming the network survived encapsulation in the ta-C coating. Nano-mechanical testing suggests that the ta-C coated SWCNTN has superior wear performance compared to uncoated SWCNTN.

  9. 2009-06 "Support for Innovative Approaches to Community Outreach on

    Office of Environmental Management (EM)

    Environmental Restoration Work at TA-21" | Department of Energy 6 "Support for Innovative Approaches to Community Outreach on Environmental Restoration Work at TA-21" 2009-06 "Support for Innovative Approaches to Community Outreach on Environmental Restoration Work at TA-21" The intent of this Recommendation is to support community outreach objectives using innovative approaches that would make use of web-based tools to demonstrate actual work being performed at

  10. Central Characterization Program (CCP), Acceptable Knowledge Summary Report

    Office of Environmental Management (EM)

    for Los Alamos National Laboratory, TA-55 Mixed Transuranic Waste Streams | Department of Energy , Acceptable Knowledge Summary Report for Los Alamos National Laboratory, TA-55 Mixed Transuranic Waste Streams Central Characterization Program (CCP), Acceptable Knowledge Summary Report for Los Alamos National Laboratory, TA-55 Mixed Transuranic Waste Streams This document was used to determine facts and conditions during the Department of Energy Accident Investigation Board's investigation

  11. old.new.factsheets.indd

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

    5 PF-4 LANL Plutonium-Processing Facilities National Security At the Los Alamos National Laboratory (LANL), virtually all plutonium operations occur within the Plutonium Facility at Tech- nical Area 55 (TA-55). TA-55 is the nation's most modern plu- tonium science and manufacturing facility, and it is the only fully operational, full capability plutonium facility in the nation. Thus, TA-55 supports a wide range of national security programs that involve stockpile stewardship, plutonium

  12. Microsoft Word - Climate-Infrastructure-Workshop_agenda_R4.docx

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

    Workshop on Closing the Gap between Infrastructure Assessments and Climate Simulation 7 January 2016 Sponsors: ADCLES, ADTIR, ADTSC When: Thursday, 7 January 2016; 10:30 am to 5:00 pm Where: Piñon Conference Room (TA-53; Building 31; Room 201) - primary venue Cactus Conference Room (TA-53; Building 31; Room 305) - breakouts Aspen Conference Room (TA-53; Building 31; Room 290) - breakouts Purpose: To develop a compelling technical understanding for needs at the interface between infrastructure

  13. Dose dependence of mechanical properties in tantalum and tantalum alloys after low temperature irradiation

    SciTech Connect (OSTI)

    Byun, Thak Sang

    2008-01-01

    The dose dependence of mechanical properties was investigated for tantalum and tantalum alloys after low temperature irradiation. Miniature tensile specimens of three pure tantalum metals, ISIS Ta, Aesar Ta1, Aesar Ta2, and one tantalum alloy, Ta-1W, were irradiated by neutrons in the High Flux Isotope Reactor (HFIR) at ORNL to doses ranging from 0.00004 to 0.14 displacements per atom (dpa) in the temperature range 60 C 100 oC. Also, two tantalum-tungsten alloys, Ta-1W and Ta-10W, were irradiated by protons and spallation neutrons in the LANSCE facility at LANL to doses ranging from 0.7 to 7.5 dpa and from 0.7 to 25.2 dpa, respectively, in the temperature range 50 C 160 oC. Tensile tests were performed at room temperature and at 250oC at nominal strain rates of about 10-3 s-1. All neutron-irradiated materials underwent progressive irradiation hardening and loss of ductility with increasing dose. The ISIS Ta experienced embrittlement at 0.14 dpa, while the other metals retained significant necking ductility. Such a premature embrittlement in ISIS Ta is believed to be because of high initial oxygen concentrations picked up during a pre-irradiation anneal. The Ta-1W and Ta-10W specimens irradiated in spallation condition experienced prompt necking at yield since irradiation doses for those specimens were high ( 0.7 dpa). At the highest dose, 25.2 dpa, the Ta-10W alloy specimen broke with little necking strain. Among the test materials, the Ta-1W alloy displayed the best combination of strength and ductility. The plastic instability stress and true fracture stress were nearly independent of dose. Increasing test temperature decreased strength and delayed the onset of necking at yield.

  14. Most Viewed Documents - Energy Storage, Conversion, and Utilization...

    Office of Scientific and Technical Information (OSTI)

    - Energy Storage, Conversion, and Utilization Process Equipment Cost Estimation, Final ... Evaluation of the 2007 Toyota Camry Hybrid Syneregy Drive System Burress, T.A.; ...

  15. Sandia National Laboratories: Z Pulsed Power Facility: Publications

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

    Author Title Journal Volume RE Falcon An experimental platform for creating white dwarf photospheres in the laboratory High Energy Density Physics 9 TA Haill Mesoscale simulation ...

  16. Resistive switching in a few nanometers thick tantalum oxide film formed by a metal oxidation

    SciTech Connect (OSTI)

    Ohno, Takeo; Samukawa, Seiji

    2015-04-27

    Resistive switching in a Cu/Ta{sub 2}O{sub 5}/Pt structure that consisted of a few nanometer-thick Ta{sub 2}O{sub 5} film was demonstrated. The Ta{sub 2}O{sub 5} film with thicknesses of 25?nm was formed with a combination of Ta metal film deposition and neutral oxygen particle irradiation at room temperature. The device exhibited a bipolar resistive switching with a threshold voltage of 0.2?V and multilevel switching operation.

  17. Center for Advanced Solar Photophysics | Members

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

    V. Talapin Department of Chemistry, The University of Chicago Tuesday, March 23, 11am Chemistry Division Auditorium, TA-46, Bld. 535, Rm. 103 Abstract Nanoparticles of...

  18. Special Report Order, Los Alamos National Security, LLC - January...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    to Glovebox Activities at TA-55 and Chemistry and Metallurgy Research Facilities at ... glovebox activities at Technical Area 55 and Chemistry and Metallurgy Research facilities. ...

  19. Chapter 7: Advancing Systems and Technologies to Produce Cleaner...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ... that perform well in harsh environments; sensor applications that make use of nanotechnology; Quadrennial Technology Review 2015 5 TA 7.E: Natural Gas Delivery Infrastructure ...

  20. ccelania | The Ames Laboratory

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

    ccelania Ames Laboratory Profile Christopher Celania Grad Asst-TA/RA Division of Materials Science & Engineering 325 Spedding Phone Number: 641-226-7542 Email Address: ccelania

  1. National Nuclear Security Administration has selected Los Alamos...

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

    TA-55 to continue LOS ALAMOS, New Mexico, December 18, 2007 - The Department of Energy's National Nuclear Security Administration has selected Los Alamos National Laboratory as...

  2. EA-1375: Finding of No Significant Impact

    Broader source: Energy.gov [DOE]

    Construction and Operation of a New Office Building and Related Structures Within TA-3 at Los Alamos National Laboratory, Los Alamos, New Mexico

  3. Newsletters | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    December 31, 2015 Sewage Treatment Facility at TA-21 before demolition December 2015 Newsletter - Los Alamos Field Office Legacy Cleanup December 2015 Newsletter - Los Alamos Field ...

  4. Preliminary Notice of Violation, University of California - EA...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Issued to the University of California related to Operational Performance at the Los ... TA-55 airborne contamination event that occurred at the Los Alamos National Laboratory. ...

  5. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... decomposition of water into hydrogen gas using ultraviolet and visible solar radiation. ... TaON is considered as a potential candidate as a visible-light responsive photocatalyst. ...

  6. Microsoft Word - WIPP Rad Event Report Phase 2 04.16.2015.docx

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

    ... WIPP Waste Acceptance Criteria (WAC) requirements are ... Operations associated with waste management at TA-54, ... Area 54, Area G The low level waste, mixed low level waste, ...

  7. NNMCAB Member Update

    Broader source: Energy.gov [DOE]

    At the September 24, 2014 Board meeting Patti Jones LANL, Provided the Members with a Status Update to the TA-21 Demolition and Storm Water Season Rain Events.

  8. Waste Management Committee Fiscal Year 2015 Work Plan | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    5 Work Plan Waste Management Committee Fiscal Year 2015 Work Plan Topics: TA-54 Consent ... Environmental Monitoring and Remediation Committee Fiscal Year 2015 Work Plan ...

  9. Waste Management Committee Fiscal Year 2016 Work Plan | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    6 Work Plan Waste Management Committee Fiscal Year 2016 Work Plan Topics: TA-54 WIPP ... More Documents & Publications Waste Management Committee Fiscal Year 2014 Work Plan Waste ...

  10. Waste Management Committee Fiscal Year 2014 Work Plan | Department...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    4 Work Plan Waste Management Committee Fiscal Year 2014 Work Plan Topics: TA-54 Consent ... More Documents & Publications Waste Management Committee Fiscal Year 2016 Work Plan ...

  11. Process for obtaining multiple sheet resistances for thin film hybrid microcircuit resistors

    DOE Patents [OSTI]

    Norwood, David P.

    1989-01-01

    A standard thin film circuit containing Ta.sub.2 N (100 ohms/square) resirs is fabricated by depositing on a dielectric substrate successive layers of Ta.sub.2 N, Ti and Pd, with a gold layer to provide conductors. The addition of a few simple photoprocessing steps to the standeard TFN manufacturing process enables the formation of Ta.sub.2 N+Ti (10 ohms/square) and Ta.sub.2 N+Ti+Pd (1 ohm/square) resistors in the same otherwise standard thin film circuit structure.

  12. BFC Solutions Limited | Open Energy Information

    Open Energy Info (EERE)

    BFC Solutions Limited Jump to: navigation, search Name: BFC Solutions Limited Place: Taunton, England, United Kingdom Zip: TA1 PEJ Sector: Carbon Product: Somerset-based...

  13. RAPID/Library | Open Energy Information

    Open Energy Info (EERE)

    Application (Form TA 210) Example 1981 Memorandum of Understanding between the Federal Energy Regulatory Commission and the Water and Power Resources Service 1992 Memorandum of...

  14. Center for Nanophase Materials Sciences (CNMS) - General Characterizat...

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

    of evolved gases See Macromolecular Nanomaterials Capabilities Differential Scanning Calorimeter TA Instruments Q2000 with temperature range from -180 to 550C See Macromolecular...

  15. Order within disorder: The atomic structure of ion-beam sputtered amorphous

    Office of Scientific and Technical Information (OSTI)

    tantala (a-Ta{sub 2}O{sub 5}) (Journal Article) | SciTech Connect Order within disorder: The atomic structure of ion-beam sputtered amorphous tantala (a-Ta{sub 2}O{sub 5}) Citation Details In-Document Search Title: Order within disorder: The atomic structure of ion-beam sputtered amorphous tantala (a-Ta{sub 2}O{sub 5}) Amorphous tantala (a-Ta{sub 2}O{sub 5}) is a technologically important material often used in high-performance coatings. Understanding this material at the atomic level

  16. Delta Energy Environment | Open Energy Information

    Open Energy Info (EERE)

    Delta Energy & Environment Place: Glasgow, Scotland, United Kingdom Zip: G1 3TA Sector: Renewable Energy Product: Delta Energy & Environment provides consultancy, research and...

  17. Concentration-dependent short-range order in the relaxor ferroelectric

    Office of Scientific and Technical Information (OSTI)

    (1-x)Pb(Sc,Ta)O[subscript 3-x] PbTiO[subscript 3] (Journal Article) | SciTech Connect Concentration-dependent short-range order in the relaxor ferroelectric (1-x)Pb(Sc,Ta)O[subscript 3-x] PbTiO[subscript 3] Citation Details In-Document Search Title: Concentration-dependent short-range order in the relaxor ferroelectric (1-x)Pb(Sc,Ta)O[subscript 3-x] PbTiO[subscript 3] Using the x-ray diffraction and x-ray absorption fine structure techniques, we have probed Ti, Ta, and Sc local environments

  18. EIS-0319: Final Environmental Impact Statement | Department of...

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

    TA-18 Relocation EIS evaluates the potential direct, indirect, and cumulative environmental impacts associated with this proposed action at the following DOE sites: (1) a different...

  19. Observation of magnon-mediated current drag in Pt/yttrium iron

    Office of Scientific and Technical Information (OSTI)

    garnet/Pt(Ta) trilayers (Journal Article) | DOE PAGES Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers Title: Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers Pure spin current, a flow of spin angular momentum without flow of any accompanying net charge, is generated in two common ways. One makes use of the spin Hall effect in normal metals (NM) with strong spin-orbit coupling, such as Pt or Ta. The other utilizes

  20. Order within disorder: The atomic structure of ion-beam sputtered...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Order within disorder: The atomic structure of ion-beam sputtered ... of a-TaO coatings, where high-quality experimental data and theoretical fits ...

  1. Search for: All records | DOE PAGES

    Office of Scientific and Technical Information (OSTI)

    Article Publisher's Accepted Manuscript Journal Name: Subject: Identifier Numbers: ... of a-TaO coatings, where high-quality experimental data and theoretical fits ...

  2. Greening Transportation

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

    to LANL. The transit station near TA-03 has a constant stream of buses picking up and dropping off riders, demonstrating LANL workers' commitment to energy-efficient...

  3. EA-0874: Final Environmental Assessment

    Broader source: Energy.gov [DOE]

    Low-level Waste Drum Staging Building at Weapons Engineering Tritium Facility, TA-16 Los Alamos National Laboratory, Los Alamos, New Mexico

  4. EA-1375: Final Environmental Assessment

    Broader source: Energy.gov [DOE]

    Construction and Operation of a New Office Building and Related Structures within TA-3 at Los Alamos National Laboratory, Los Alamos, New Mexico

  5. Central Characterization Program (CCP), Acceptable Knowledge...

    Office of Environmental Management (EM)

    , Acceptable Knowledge Summary Report for Los Alamos National Laboratory, TA-55 Mixed Transuranic Waste Streams Central Characterization Program (CCP), Acceptable Knowledge Summary...

  6. DOE/EIS-0380

    Energy Savers [EERE]

    ... Environmental Impact Statement SWPPP Stormwater Pollution Prevention Plan TA technical ... of the DARHT facility as a result of severe stormwater runoff: Commitments (a-c). ...

  7. EA-0874: Finding of No Significant Impact

    Office of Energy Efficiency and Renewable Energy (EERE)

    Low-level Waste Drum Staging Building at Weapons Engineering Tritium Facility, TA-16 Los Alamos National Laboratory, Los Alamos, New Mexico

  8. Microsoft PowerPoint - 2010 ENG Presentation - CAMD.pptx

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

    ... - TA TGA - SRI TGA - RT to 2000 (3600min), O 2 , Multi - gm samples Thermal Property Measurement Capabilities Thermal Property Measurement Capabilities Specialized Testing ...

  9. Center for Advanced Solar Photophysics | Members

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

    22, 10am Chemistry Division Auditorium, TA-46, Bld. 535, Rm. 103 Abstract The strong zero-dimensional quantum confinement realized in colloidal semiconductor nanocrystals...

  10. Strong Second Harmonic Generation from the Tantalum Thioarsenates

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

    A3Ta2AsS11 (A = K and Rb) | Energy Frontier Research Centers Strong Second Harmonic Generation from the Tantalum Thioarsenates A3Ta2AsS11 (A = K and Rb) Home Author: T.K. Bera, J.I. Jang, J.B. Ketterson, M.G. Kanatzidis Year: 2009 Abstract: The strongly anisotropic thioarsenates A(3)Ta(2)AsS(11) are stabilized in a polysulfide flux. All compounds contain the same parallel (1)/(infinity)[Ta(2)AsS(11)(3-)] polymeric anionic chains, but the size of the alkali-metals has a profound effect on the

  11. FY05 LDRD Final Report Mapping Phonons at High-pressure (Technical...

    Office of Scientific and Technical Information (OSTI)

    at the determination of the pressure evolution of the transverse acoustic (TA) and ... along the 100 direction, the pressure evolution of the two other longitudinal branches ...

  12. Grand Challenges

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

    Grand Challenges Grand Challenges Our goals to live a sustainable future LANL stakeholders TA-21 cleanup activities water on LANL land Collaborate with our stakeholders and tribal...

  13. Data Assimilation (UQ/DA) Study

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

    Uncertainty Quantification and Data Assimilation (UQ/DA) Study on a VERA Core Simulator Component for CRUD Analysis Hany S. Abdel-Khalik North Carolina State University Reviewed by J. Michael Doster (NCSU) Rod Schmidt (SNL) August 30, 2013 CASL-U-2013-0184-000 Milestone Report for L2:VUQ:P7.02 Uncertainty Quantification and Data Assimilation (UQ/DA) Study on a VERA Core Simulator Component for CRUD Analysis CASL-I-2013-0184-000 Jason M. Hite 1 , Hany S. Abdel-Khalik 1 , Ralph C. Smith 2 , Mami

  14. Siting study for a consolidated waste capability at Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Booth, Steven Richard

    2010-11-05

    Decision analysis was used to rank alternative sites for a potential Consolidated Waste Capability (CWC) to replace current hazardous solid waste operations (hazardous/chemical, mixed low-level, transuranic, and low-level waste) at Los Alamos National Laboratory's Technical Area (TA)-54. An original list of 21 site alternatives was pre-screened to seven sites that were assessed using the analytical hierarchy process with five top-level criteria and fifteen sub-criteria. The top site choice is TA-63/52/46; the second choice is TA-18/36. The seven sites are as follows. TA-18/36 (62 acres) is located on Potrillo Drive that intersects Pajarito Road at the bottom of a steep grade. It has some blast zone issues on its southwest side and some important archeological sites on the southeast section. TA-60 (50 acres) is located at the end of Eniwetok Road off Diamond Drive, east of TA-3. Most of the site is within a fifty foot-deep ravine (that may have contamination in the drainage), with a small section on the mesa above. TA-63/52/46 (110 acres) lies to the north of Pajarito Road along Puye Road. It is centrally located in a brown field industrial area, with good access to generators on a controlled road. TA-46 (22 acres) is a narrow site on the south side of Pajarito Road across from TA-46 office buildings. TA-48 (14 acres) is also narrow, and is located on the north side of Pajarito Road near the west vehicle access portal (VAP). TA-51 (19 acres) is located on the south side of Pajarito Road at the top of the hill above TA-18 near the current entrance to the TA-54. TA-54 West (16 acres) is just north of the entrance to TA-54 at Pajarito Road and is close to Zone 4. Although it is near the San Ildefonso Pueblo property line, there may be adequate set-back for sight screening.

  15. A=6He (1988AJ01)

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

    1987YA16, 1988AL1G, 1988LI1A, 1988ST06, 1988TA1A, 1988WO10). Applications: (1985TA1D). Muon and neutrino capture and reactions: (1983JU01, 1984WA1J). Reactions involving pions,...

  16. A=20Ne (1983AJ01)

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

    1981LO1F, 1981MA1G, 1981NA1E, 1981SC03, 1981TA02, 1982ME1C, 1982SU01, 1982TA02). Muon and neutrino capture and reactions: (1978IT1A, 1979YU02, 1980GA10, 1981PA1D). Pion...

  17. A=16O (71AJ02)

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

    Diagrams for 16O) GENERAL: See also (59AJ76) and Table 16.9 Table of Energy Levels (in PDF or PS). Shell model: (WI57H, BR59M, FE59C, PA59A, TA60H, TA60L, BA61N, TR61, BA62F,...

  18. 05-05-2010 NNSA-B-09-0152

    National Nuclear Security Administration (NNSA)

    NNSA-B-09-0152 Sandia National Laboratories/New Mexico (SNL/NM) proposes to remove the existing electrical bus duct system in Building 860, Tech Area I (TA-I), and install a new bus. ✖ Sandia Site Office Building 860 Electrical Bus Duct Replacement (TA-I) Sandia National Laboratories - New Mexico

  19. Evaluation Project 4492

    National Nuclear Security Administration (NNSA)

    9-12-2011 NNSA-B-10-0336 Sandia National Laboratories/New Mexico (SNL/NM) proposes to remove Environmental Restoration (ER) Site #50, Old Centrifuge Site (East of TA-II). ✖ Sandia Site Office Rocket Centrifuge Removal (Eastern Side of TA-II) Sandia National Laboratories - New Mexico LACY,SUSAN DOYLENE 09/12/2011

  20. CX-004729: Categorical Exclusion Determination

    Office of Energy Efficiency and Renewable Energy (EERE)

    Bio-Response Operational Testing and Evaluation (BOTE) Project (TA-I, TA-III, and Offsite at Idaho National Laboratory)CX(s) Applied: B3.12Date: 10/12/2010Location(s): IdahoOffice(s): Sandia Site Office

  1. PLEAEERUSH ANALYTICAL DA-~-A SHEET

    Office of Legacy Management (LM)

    ' PLEAEERUSH ANALYTICAL DA-~-A SHEET ' ANALYTICAL DEPT. - HEALTH AhD SAFETY DlVlSlON 1956 Industrial Hygiene or Medical Dept. 1. H.#~~Sample Nos. 3 --Date Collected~~by-CESS-.Route to CBS LocationTITANIUM Type of Sample airnalyzed for F Alpham Remarks NIAGARA pALI+S* N.Y. U Beta Bldg. 103 - furnace room - -NO, Ra Oil PH Be Th Sample No. Hour Sample Description I I I--- R ) T 1 Q I I I 7392 1100 GA Induction furnace area duri-nn ----l----- mDeriod;.02; 151 .3 while furnace was charged with UOT_-

  2. Eletricidade da Amaz nia S A ELETRAM | Open Energy Information

    Open Energy Info (EERE)

    Amaz nia S A ELETRAM Jump to: navigation, search Name: Eletricidade da Amaznia SA (ELETRAM) Place: Cuiaba, Mato Grosso, Brazil Zip: 78040-570 Sector: Hydro Product: Small...

  3. Streamlined Approach for Environmental Restoration Plan for Corrective Action Unit 484: Surface Debris, Waste Sites, and Burn Area, Tonopah Test Range, Nevada

    SciTech Connect (OSTI)

    Bechel Nevada

    2004-05-01

    This Streamlined Approach for Environmental Restoration plan details the activities necessary to close Corrective Action Unit (CAU) 484: Surface Debris, Waste Sites, and Burn Area (Tonopah Test Range). CAU 484 consists of sites located at the Tonopah Test Range, Nevada, and is currently listed in Appendix III of the Federal Facility Agreement and Consent Order. CAU 484 consists of the following six Corrective Action Sites: (1) CAS RG-52-007-TAML, Davis Gun Penetrator Test; (2) CAS TA-52-001-TANL, NEDS Detonation Area; (3) CAS TA-52-004-TAAL, Metal Particle Dispersion Test; (4) CAS TA-52-005-TAAL, Joint Test Assembly DU Sites; (5) CAS TA-52-006-TAPL, Depleted Uranium Site; and (6) CAS TA-54-001-TANL, Containment Tank and Steel Structure

  4. Role of atomistic structure in the stochastic nature of conductivity in substoichiometric tantalum pentoxide

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Bondi, Robert James; Fox, Brian Philip; Marinella, Matthew J.

    2016-03-22

    In this study, first-principles calculations of electrical conductivity (σo) are revisited to determine the atomistic origin of its stochasticity in a distribution generated from sampling 14 ab-initio molecular dynamics configurations from 10 independently quenched models (n = 140) of substoichiometric amorphous Ta2O5, where each structure contains a neutral O monovacancy (VO0). Structural analysis revealed a distinct minimum Ta-Ta separation (dimer/trimer) corresponding to each VO0 location. Bader charge decomposition using a commonality analysis approach based on the σo distribution extremes revealed nanostructural signatures indicating that both the magnitude and distribution of cationic charge on the Ta subnetwork have a profound influencemore » on σo. Furthermore, visualization of local defect structures and their electron densities reinforces these conclusions and suggests σo in the amorphous oxide is best suppressed by a highly charged, compact Ta cation shell that effectively screens and minimizes localized VO0 interaction with the a-Ta2O5 network; conversely, delocalization of VO0 corresponds to metallic character and high σo. The random network of a-Ta2O5 provides countless variations of an ionic configuration scaffold in which small perturbations affect the electronic charge distribution and result in a fixed-stoichiometry distribution of σo; consequently, precisely controlled and highly repeatable oxide fabrication processes are likely paramount for advancement of resistive memory technologies.« less

  5. Synthesis, characterization and photocatalytic properties of lithium tantalate

    SciTech Connect (OSTI)

    Zielinska, Beata Mijowska, Ewa; Kalenczuk, Ryszard J.

    2012-06-15

    Lithium tantalate (LiTaO{sub 3}) was successfully synthesized thorough an impregnation method of tantalum pentaoxide in the aqueous solution of lithium hydroxide. Next, the sample was divided into eight batches and calcinated in a temperature range of 450-800 Degree-Sign C. The materials produced were then characterized by X-ray diffraction, Raman spectroscopy, Diffuse Reflectance (DR) UV-vis spectroscopy, BET analysis, and high resolution transmission electron microscopy. Moreover, the samples were tested as photocatalysts in a reaction of hydrogen generation. Interestingly, it was found that the sample calcinated at 550 Degree-Sign C exhibits the highest photocatalytic activity. This sample is composed of 85% of LiTaO{sub 3} and 15% of Ta{sub 2}O{sub 5}. - Highlights: Black-Right-Pointing-Pointer LiTaO{sub 3} was synthesized thorough an impregnation of Ta{sub 2}O{sub 5} and LiOH and calcination at the temperature range of 450-800 Degree-Sign C. Black-Right-Pointing-Pointer Each calcinated sample was tested as photocatalyst in the reaction of hydrogen generation. Black-Right-Pointing-Pointer It was found that the key parameter determining their activity is the sample composition. Black-Right-Pointing-Pointer The sample exhibiting the highest activity is composed of LiTaO{sub 3} (85.1%) and unreacted Ta{sub 2}O{sub 5} (14.9%).

  6. Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion

    Office of Scientific and Technical Information (OSTI)

    Semimetal TaAs (Journal Article) | SciTech Connect Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs Citation Details In-Document Search This content will become publicly available on March 1, 2017 Title: Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs Authors: Xu, Su-Yang ; Belopolski, Ilya ; Sanchez, Daniel S. ; Neupane, Madhab ; Chang, Guoqing ; Yaji, Koichiro ; Yuan, Zhujun ; Zhang, Chenglong ; Kuroda, Kenta ; Bian,

  7. Type B Accident Investigation of the Acid Vapor Inhalation on June 7, 2005,

    Energy Savers [EERE]

    in TA-48, Building RC-1 Room 402 at the Los Alamos National Laboratory | Department of Energy of the Acid Vapor Inhalation on June 7, 2005, in TA-48, Building RC-1 Room 402 at the Los Alamos National Laboratory Type B Accident Investigation of the Acid Vapor Inhalation on June 7, 2005, in TA-48, Building RC-1 Room 402 at the Los Alamos National Laboratory Setpember 27, 2005 During the afternoon of June 7, 2005, two postdoctoral (postdoc) employees working at the Los Alamos National

  8. Observation of magnon-mediated current drag in Pt/yttrium iron

    Office of Scientific and Technical Information (OSTI)

    garnet/Pt(Ta) trilayers (Journal Article) | SciTech Connect SciTech Connect Search Results Journal Article: Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers Citation Details In-Document Search Title: Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers Pure spin current, a flow of spin angular momentum without flow of any accompanying net charge, is generated in two common ways. One makes use of the spin Hall effect in

  9. Observation of magnon-mediated current drag in Pt/yttrium iron

    Office of Scientific and Technical Information (OSTI)

    garnet/Pt(Ta) trilayers (Journal Article) | SciTech Connect Journal Article: Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers Citation Details In-Document Search Title: Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers × You are accessing a document from the Department of Energy's (DOE) SciTech Connect. This site is a product of DOE's Office of Scientific and Technical Information (OSTI) and is provided as a public

  10. Advisements

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

    20th Annual HAZMAT Challenge » Advisements Advisements The HAZMAT Challenge is not for the faint of heart. Teams should be prepared for local conditions and fully geared to participate. Access to TA-49 The LANL Hazardous Device Team also uses TA-49; therefore, every individual will need to sign in and out daily for accountability purposes in case an evacuation is necessary. Players and visitors will be given instructions in case TA-49 must be used for this purpose. Arrangements will be made

  11. Superconducting properties in single crystals of the topological nodal

    Office of Scientific and Technical Information (OSTI)

    semimetal PbTaSe 2 (Journal Article) | SciTech Connect Superconducting properties in single crystals of the topological nodal semimetal PbTaSe 2 Citation Details In-Document Search This content will become publicly available on February 21, 2017 Title: Superconducting properties in single crystals of the topological nodal semimetal PbTaSe 2 Authors: Zhang, Cheng-Long ; Yuan, Zhujun ; Bian, Guang ; Xu, Su-Yang ; Zhang, Xiao ; Hasan, M. Zahid ; Jia, Shuang Publication Date: 2016-02-22 OSTI

  12. A=16O (1959AJ76)

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

    1959AJ76) (See the Energy Level Diagram for 16O) GENERAL: See also Table 16.3 [Table of Energy Levels] (in PDF or PS). Theory: See (DE54C, FL54A, HE55F, JA55A, MA55F, MA55O, SC55A, WI55F, EL56, FE56B, JA56C, KA56A, MO56, PE56A, RE56B, WI56C, EL57B, FE57D, GR57C, HE57B, RE57, TA57A, TO57A, CA58C, DA58A, DA58D, FE58A, FE58B, HA58B, MO58, RA58F, UM58, WI58G). 1. 12C(α, γ)16O Qm = 7.148 Resonant capture radiation to 16Og.s. is observed at Eα ~ 3.24 MeV, corresponding to the known J = 1- state at

  13. Regional

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

    3 AÇORIANO ORIENTAL SEGUNDA-FEIRA, 5 DE MARÇO DE 2012 PUB Da Graciosa para a Índia graças à estação atmosférica Carlos está atualmente a trabalhar na estação atmosférica móvel instalada na Índia, a dois mil metros de altitude Estar no lugar certo na hora cer- ta pode mudar radicalmente a vida de uma pessoa. Foi isso que aconteceu ao graciosense Carlos Sousa, de 41 anos, que começou por ser trabalhador daconstrução civil antes de emigrar para os Es- tados Unidos da América. No

  14. CoDA 2016, the Conference on Data Analysis

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

    March » CoDA 2016, the Conference on Data Analysis CoDA 2016, the Conference on Data Analysis WHEN: Mar 02, 2016 8:00 AM - Mar 04, 2016 5:00 PM WHERE: Eldorado Hotel 309 W. San Francisco St., Santa Fe, NM CONTACT: Kary Myers (505) 606-1455 CATEGORY: Science TYPE: Conference INTERNAL: Calendar Login Event Description Join us for the Conference on Data Analysis, highlighting data-driven problems of interest to the Department of Energy. We invite you to present your data-focused work at the poster

  15. Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award August 19, 2013 - 5:07pm Addthis ...

  16. Funda o Parque Tecnol gico da Paraiba PaqTc Incubator | Open...

    Open Energy Info (EERE)

    Funda o Parque Tecnol gico da Paraiba PaqTc Incubator Jump to: navigation, search Name: Fundao Parque Tecnolgico da Paraiba (PaqTc Incubator) Place: Brazil Sector: Services...

  17. Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award August 19, 2013 - 5:07pm Addthis...

  18. EERE Success Story-Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award EERE Success Story-Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award August 19, 2013 - ...

  19. Roles and Delegation of Authority (R/DA) System

    SciTech Connect (OSTI)

    ABBOTT,JOHN P.; HUTCHINS,JAMES C.; SCHOCH,DAVID G.

    1999-11-01

    The processes of defining managerial roles and providing for delegation of authority are essential to any enterprise. At most large organizations, these processes are defined in policy manuals and through sets of standard operating procedures for many, if not all, business and administrative functions. Many of these staff-initiated, administrative functions require the routing of documents for approval to one or more levels of management. These employee-oriented, back office types of workflows tend to require more flexibility in determining to whom these documents should go to, while, at the same time, providing the responsible parties with the flexibility to delegate their approval authority or allow others to review their work. Although this practice is commonplace in manual, paper-based processes that exist in many organizations, it is difficult to provide the same flexibility in the more structured, electronic-based, workflow systems. The purpose of this report is to present a framework or architecture for creating a R/DA system and provide some insights associated with its design and utilization. To improve understanding and clarify subsequent discussion, the goals and requirements for the major R/DA system components, namely, the database and interface modules, are initially presented along with the identification of important concepts and the definition of critical terms. Next high-level functions relating the types of inputs to the outputs of the R/DA interface module are introduced and discussed. Then the relationships between the major R/DA modules and the primary components associated with its creation and maintenance are presented and analyzed. Finally, some conclusions are drawn relative to the advantages associated with developing a R/DA system for use in implementing an enterprise-wide, work-facilitating information system.

  20. Vehicle Technologies Office Merit Review 2014: Modeling for Market Analysis: HTEB, TRUCK, and LVChoice

    Broader source: Energy.gov [DOE]

    Presentation given by TA Engineering, Inc. at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about HTEB, TRUCK, and...

  1. Departm

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

    Acting Bureau Chief Hazardous Waste Bureau New Mexico Environment Department 2905 Rodeo Park Drive East, Building 1 San ta Fe, New Mexico 87 505-6303 MAY 2 4 2012 Subject:...

  2. Community D Mixed/Pine Hardwood D Bottomland Hardwood Mixed

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

    D Bottomland Hardwood Mixed Swamp Forest Soils 540 Soils Soil Series and Phase DCh .OrC .Sh .Ta o 540 1080 Meters N A sc Figure 7-2. Plant communities and soils associated...

  3. PrintRes_PeriodicChartPostCard2014

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

    56 Ba Barium 73 Ta Tantalum 19 K Potassium 20 Ca Calcium 21 Sc Scandium 22 Ti Titanium 30 Zn Zinc 31 Ga Gallium 32 Ge Germanium 33 As Arsenic 34 Se Selenium 35 Br Bromine ...

  4. CX-005361: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Construction of Protective Force Indoor Live Fire Range at TA-16CX(s) Applied: B1.15Date: 02/28/2011Location(s): New MexicoOffice(s): Los Alamos Site Office

  5. Corrective Action Decision Document/Closure Report for Corrective Action Unit 410: Waste Disposal Trenches, Tonopah Test Range, Nevada: Revision No. 0

    SciTech Connect (OSTI)

    U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office

    2003-12-22

    This Corrective Action Decision Document/Closure Report (CADD/CR) has been prepared for Corrective Action Unit (CAU) 410: Waste Disposal Trenches, Tonopah Test Range, Nevada, in accordance with the Federal Facility Agreement and Consent Order. Corrective Action Unit 410 consists of five Corrective Action Sites (CASs): TA-21-003-TANL; 09-21-001-TA09; TA-19-002-TAB2; TA-21-002-TAAL; and 03-19-001. The CADD and CR have been combined into one report because no further action is recommended for this CAU. The corrective action alternative recommended for CAU 410 is Clean Closure; therefore, no corrective action or corrective action plan is required. No use restrictions are required to be placed on this CAU because the investigation showed no evidence of remaining soil contamination or remaining debris/waste upon completion of all investigation activities.

  6. National Ignition Facility

    National Nuclear Security Administration (NNSA)

    NIF, in particular the first Pu experiment on NIF, the return to operations of the TA-55 gas gun, a successful series of plutonium experiments on Joint Actinide Shock Physics...

  7. ssp

    National Nuclear Security Administration (NNSA)

    NIF, in particular the first Pu experiment on NIF, the return to operations of the TA-55 gas gun, a successful series of plutonium experiments on Joint Actinide Shock Physics...

  8. stockpile stewardship program

    National Nuclear Security Administration (NNSA)

    NIF, in particular the first Pu experiment on NIF, the return to operations of the TA-55 gas gun, a successful series of plutonium experiments on Joint Actinide Shock Physics...

  9. advanced simulation and computing

    National Nuclear Security Administration (NNSA)

    NIF, in particular the first Pu experiment on NIF, the return to operations of the TA-55 gas gun, a successful series of plutonium experiments on Joint Actinide Shock Physics...

  10. ARM - Publications: Science Team Meeting Documents

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

    Using GFS Weather Model to Reduce Diurnal Differences Between GPS PW and ARM MWR PW Van Hove, T.(a), Liljegren, J.C.(b), Rocken, C.(a), and Braun, J.(a), University Corporation for...

  11. Part 3 of 11

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    small module product. 3.24 Task 24 Debu g And T est M odul e Manufacturing Equipm ent ... 15, 16, and 17. 3.25 Ta sk 25 Develop, Debu g, And Test Robotic Pick And Place Machin e ...

  12. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... Klein, P (1) Mishra, S (1) Newman, JF (1) Turner, DD (1) Wainwright, CE (1) Wharton, S (1) ... Klein, P ; Bonin, TA ; Newman, JF ; Turner, DD ; Chilson, P ; Blumberg, WG ; Mishra, ...

  13. WAPD-TM-1349 DOE RESEARCH AND DEVELOPMENT REPORT FORCES IN BOLTED...

    Office of Scientific and Technical Information (OSTI)

    ... per deg.ree temperaturE .change in region IIi II Ta ... 1 tan a cos A ' t system linear mismatch Equations ... and nickel alloys, with threads machined to a class 2 fit. ...

  14. A=11Li (1990AJ01)

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

    increase in matter radii with increasing A and do not support the idea of a neutron halo in 11Li (1988POZS; prelim.). See, however, (1988TA1A). Fragmentation cross sections of...

  15. Siting study for a consolidated waste capability at Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Booth, Steven Richard

    2011-01-26

    Decision analysis was used to rank alternative sites for a new Consolidated Waste Capability (CWC) to replace current hazardous solid waste operations (hazardous/chemical, mixed lowlevel, transuranic, and low-level waste) at Los Alamos National Laboratory's TA-54 Area G. An original list of 21 site alternatives was pre-screened to ten sites that were assessed using the analytical hierarchy process with five top-level criteria and fifteen sub-criteria. Three passes of the analysis were required to assess different site scenarios: 1) a fully consolidated CWC with both transfer/storage and LL W disposal in one location (45 acre minimum), 2) CWC transfer/storage only (12 acre minimum), and 3) LLW disposal only (33 acre minimum). The top site choice for all three options is TA-63/52/46; the second choice is TA-18/36. TA-54 East, Zone 4 also deserves consideration as a LLW disposal site.

  16. LANSCE | About | History

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

    History The History of LANSCE Since 1972, the 800-million-electron-volt (MeV) accelerator and its attendant facilities at Technical Area 53 (TA-53, often referred to as "the Mesa")...

  17. OpenEI Community - Open Data+entrepreneur

    Open Energy Info (EERE)

    ta-spurs-entrepreneurship-and-jobs" rel"nofollow">posted by White House Office of Science and Technology Policy on February 4th, 2013.

  18. Ianjkalin's blog

    Open Energy Info (EERE)

    ta-spurs-entrepreneurship-and-jobs" rel"nofollow">posted by White House Office of Science and Technology Policy on February 4th, 2013.

  19. LANL: AOT & LANSCE The Pulse April 2011

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

    ... Your TA-53 WSST members WSST Chair: Eric Larson WSST Co-chair: Kristy Ortega WSST Secretary: Jean Trujillo E-mail: wsst53@lanl.gov LANSCE-LC: Eric Larson (primary), Mel Borrego ...

  20. LANL: AOT & LANSCE The Pulse September 2012

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

    ... TA-53 WSST members who participated included Eric Larson, Kristy Ortega, Jean Trujillo, ... Thomas Sisneros MST-8 665-6596 tsisneros@lanl.gov Eric Larson LANSCE-LC 667-9614 ...

  1. LANL: AOT & LANSCE The Pulse February 2013

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

    ... I encour- age you to meetknow and interact with your local WSST representative(s). Gary Sanchez (AOT-IC) is the new TA-53 WSST chair. The past chair, Eric Larson (LANSCE-LC), did ...

  2. Photochemical synthesis of a water oxidation catalyst based on...

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

    catalyst based on cobalt nanostructures Authors: Wee, T-L., Sherman, B.D., Gust, D., Moore, A.L., Moore, T.A., Liu, Y., and Scaiano, J.C. Title: Photochemical synthesis of a...

  3. A bioinspired redox relay that mimics radical interactions of...

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

    M.J., Kodis, G., Poluektov, O.G., Rajh, T., Mujica, V., Groy, T. L., Gust, D., Moore, T.A., Moore, A.L. Title: A bioinspired redox relay that mimics radical interactions...

  4. Application of pyroelectric crystal and ionic liquid to the production of metal compounds

    SciTech Connect (OSTI)

    Imashuku, Susumu; Imanishi, Akira; Kawai, Jun

    2013-04-19

    Zinc fluoride (ZnF{sub 2}) was deposited on a silicon substrate by changing temperature of a pyroelectric crystal of LiTaO{sub 3} on which ionic liquid (EMI-Tf{sub 2}N) containing zinc ions was dripped at 1 Pa. ZnF{sub 2} was also obtained by bombarding argon ions on EMI-Tf{sub 2}N containing zinc ions. From these results, it is concluded that EMI-Tf{sub 2}N containing zinc ions on the LiTaO{sub 3} crystal was evaporated on the silicon substrate by changing temperature of the LiTaO{sub 3} crystal in vacuum and that the evaporated EMI-Tf{sub 2}N containing metal zinc ions was decomposed to ZnF{sub 2} by the bombardment of electrons accelerated by the electric field between the LiTaO{sub 3} crystal and the silicon substrate.

  5. DANCE DESIGN C008753A00

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

    C008753A00 Receipt : SC00007611 Reference: Vchr Ln Account ID Project Vouc-her -Une D -esc * UseTaxCod Us Ta Un Ne I i Amount Charge cost 1...

  6. Lower Atmospheric Boundary Layer Experiment (LABLE) Final Campaign...

    Office of Scientific and Technical Information (OSTI)

    Authors: Klein, P 1 ; Bonin, TA ; Newman, JF 2 ; Turner, DD 3 ; Chilson, P 4 ; Blumberg, WG 4 ; Mishra, S ; Wainwright, CE ; Carney, M 1 ; Jacobsen, EP 4 ; Wharton, S ...

  7. CX-000575: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Building 860 2nd Floor Improvements North End (TA-I)CX(s) Applied: B1.3Date: 11/24/2009Location(s): Albuquerque, New MexicoOffice(s): Sandia Site Office

  8. CX-004224: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Building 860 Electrical Bus Duct Replacement (TA-I)CX(s) Applied: B1.3Date: 05/05/2010Location(s): New MexicoOffice(s): Sandia Site Office

  9. ARM - Publications: Science Team Meeting Documents

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

    and Precipitation Data Set for Cloud Model Evaluation Xu, K.-M.(a), Wielicki, B.A.(a), Wong, T.(a), and Randall, D.A.(b), NASA Langley Research Center (a), Colorado State...

  10. UNCLASSIFIED

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

    University Evanston, Illinois From Condensed Matter Physics to Next Generation Quantum Devices Wednesday, December 9, 2015 3:00 - 4:00pm IMSMPA Conference Room, TA-3, Bldg...

  11. Los Alamos, New Mexico, September 30, 2009-A Los Alamos National...

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

    is also important to members of the Pueblo de San Ildefonso, whose sacred lands border the area. "We know that progress on cleanup at TA-54 means a lot to Northern New...

  12. LANL demolishes first containment dome at disposal area

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

    is also important to members of the Pueblo de San Ildefonso, whose sacred lands border the area. "We know that progress on cleanup at TA-54 means a lot to Northern New...

  13. EOS standards

    SciTech Connect (OSTI)

    Greeff, Carl W

    2011-01-12

    An approach to creating accurate EOS for pressure standards is described. Applications to Cu, Au, and Ta are shown. Extension of the method to high compressions using DFT is illustrated. Comparisons with modern functionals show promise.

  14. CX-002689: Categorical Exclusion Determination

    Office of Energy Efficiency and Renewable Energy (EERE)

    Fuels Research Lab at TA-35-455CX(s) Applied: B3.6Date: 06/02/2010Location(s): New MexicoOffice(s): Los Alamos Site Office

  15. B

    National Nuclear Security Administration (NNSA)

    ... N. Holmgren Phacelia beatleyae Reveal and Constance Phacelia filiae N.D. Atwood, F.J. Smith and T.A. Knight Phacelia mustelina Coville Phacelia parishii Gray Primary Highway (with ...

  16. LANL: AOT & LANSCE The Pulse November 2013

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

    ... crucial for defense applications and for developing new fuels for fast nuclear reactors. ... consisting of an alu- minofluoride of sodium and magnesium.) La 3 TaO 7 is an ex- ...

  17. Search for: All records | DOE PAGES

    Office of Scientific and Technical Information (OSTI)

    from 0 to 3.3 WmK. Thus, the dominant thermal carrier in TaOx switches between vibrations and charge carriers and is controllable either by oxygen content during deposition,...

  18. Sound velocity of tantalum under shock compression in the 18–142 GPa range

    SciTech Connect (OSTI)

    Xi, Feng Jin, Ke; Cai, Lingcang Geng, Huayun; Tan, Ye; Li, Jun

    2015-05-14

    Dynamic compression experiments of tantalum (Ta) within a shock pressure range from 18–142 GPa were conducted driven by explosive, a two-stage light gas gun, and a powder gun, respectively. The time-resolved Ta/LiF (lithium fluoride) interface velocity profiles were recorded with a displacement interferometer system for any reflector. Sound velocities of Ta were obtained from the peak state time duration measurements with the step-sample technique and the direct-reverse impact technique. The uncertainty of measured sound velocities were analyzed carefully, which suggests that the symmetrical impact method with step-samples is more accurate for sound velocity measurement, and the most important parameter in this type experiment is the accurate sample/window particle velocity profile, especially the accurate peak state time duration. From these carefully analyzed sound velocity data, no evidence of a phase transition was found up to the shock melting pressure of Ta.

  19. EIS-0319: Relocation of Technical Area 18 Capabilities and Materials at the Los Alamos National Laboratory

    Broader source: Energy.gov [DOE]

    The TA-18 Relocation EIS evaluates the potential direct, indirect, and cumulative environmental impacts associated with this proposed action at the following DOE sites: (1) a different site at LANL...

  20. CX-000571: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Photovoltaic Panel Installation (Building 833, TA-I)CX(s) Applied: B5.1Date: 12/10/2009Location(s): Albuquerque, New MexicoOffice(s): Sandia Site Office

  1. Notice of Intent to Investigate, Los Alamos National Security...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Charles F. McMillan, President Los Alamos National Security, LLC Los Alamos National Laboratory Mailstop A 100, Drop Point 03140071S Bikini Atoll Road, TA-3 Los Alamos, New Mexico ...

  2. Femtosecond X-ray protein nanocrystallography

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

    Femtosecond X-ray protein nanocrystallography Authors: Chapman, H.N., Fromme, P., Barty, A., White, T.A., Kirian, R.A., Aquila, A., Hunter, M.S., Schulz, J., DePonte, D.P.,...

  3. Pollution Prevention

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

    during the demolition of 24 Cold War-era buildings at TA-21 to protect air quality. Recycling metal from the buildings at Technical Area 21 saved LANL from generating more than...

  4. V

    Office of Legacy Management (LM)

    It is the site of the old fire alarm building, and during the occupancy of TA-1, part of the power plant and several warehouses were included within its boundaries. After reviewing ...

  5. Weyl Fermions Discovered After 85 Years

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

    that Weyl fermions could exist in a class of materials composed of a transition metal (e.g. Ta or Nb) and a Group 15 element (e.g. As or P). They synthesized asymmetrical...

  6. ARM - Publications: Science Team Meeting Documents

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

    ERBE OLR and Cloud Type by Split Window Inoue, T.(a) and Ackerman, S.A.(b), Meteorological ... Using collocated ERBE and split windowAVHRR on board NOAA-9, we studied the relationship ...

  7. Attendee Introduction

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

    VIS AND ANALYSIS R&D FOR LARGE-SCALE DATA Salishan 2013 - LA-UR-13-21885 Jon Woodring et al.: Jim Ahrens, John Patchett, Chris Sewell, Li-Ta Lo, Chris Mitchell, Pat Fasel, Joanne...

  8. Ion-assisted physical vapor deposition for enhanced film properties on nonflat surfaces

    SciTech Connect (OSTI)

    Alami, J.; Persson, P.O.A.; Music, D.; Gudmundsson, J. T.; Bohlmark, J.; Helmersson, U.

    2005-03-01

    We have synthesized Ta thin films on Si substrates placed along a wall of a 2-cm-deep and 1-cm-wide trench, using both a mostly neutral Ta flux by conventional dc magnetron sputtering (dcMS) and a mostly ionized Ta flux by high-power pulsed magnetron sputtering (HPPMS). Structure of the grown films was evaluated by scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. The Ta thin film grown by HPPMS has a smooth surface and a dense crystalline structure with grains oriented perpendicular to the substrate surface, whereas the film grown by dcMS exhibits a rough surface, pores between the grains, and an inclined columnar structure. The improved homogeneity achieved by HPPMS is a direct consequence of the high ion fraction of sputtered species.

  9. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... Observation of magnon-mediated current drag in Ptyttrium iron garnetPt(Ta) trilayers Li, ... A popular material for the latter is yttrium iron garnet, a magnetic insulator (MI). Here ...

  10. Search for: All records | DOE PAGES

    Office of Scientific and Technical Information (OSTI)

    Observation of magnon-mediated current drag in Ptyttrium iron garnetPt(Ta) trilayers Li, ... A popular material for the latter is yttrium iron garnet, a magnetic insulator (MI). Here ...

  11. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Observation of magnon-mediated current drag in Ptyttrium iron garnetPt(Ta) trilayers Li, ... A popular material for the latter is yttrium iron garnet, a magnetic insulator (MI). Here ...

  12. CX-009799: Categorical Exclusion Determination

    Office of Energy Efficiency and Renewable Energy (EERE)

    Storm Water Control Measures at Individual Permit Site, TA-72 CX(s) Applied: B1.33, B6.1 Date: 11/14/2012 Location(s): New Mexico Offices(s): Los Alamos Site Office

  13. CX-009525: Categorical Exclusion Determination

    Office of Energy Efficiency and Renewable Energy (EERE)

    Storm Water Control Measures at Individual Permit Site, TA-72 CX(s) Applied: B1.33, B6.1 Date: 11/14/2012 Location(s): New Mexico Offices(s): Los Alamos Site Office

  14. LA-UR-15-23282

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

    3282 Former Technical Area 32 (TA-32) includes the site currently occupied by Smith's Marketplace and extends southward on to U.S. Department of Energy (DOE) National Nuclear...

  15. CX-007678: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Construction of Interagency Fire Center at TA-49 CX(s) Applied: B1.15 Date: 01/17/2012 Location(s): New Mexico Offices(s): Los Alamos Site Office

  16. September 2013 Most Viewed Documents for Physics | OSTI, US Dept...

    Office of Scientific and Technical Information (OSTI)

    Ueng, Tzou-Shin; Chen, Jian-Chu. (1992) 50 > White LED with High Package Extraction ... Coefficients of Thermal Expansion in PBX 9502 C.B. Skidmore; T.A. Butler; C.W. Sandoval ...

  17. Microsoft PowerPoint - Lubimtsev_2013_CNMS_StaffScienceHighlight...

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

    C. Kent, Bobby G. Sumpter, P. Ganesh, "Understanding the Origin of High-Rate Intercalation Pseudocapacitance in Nb 2 O 5 Crystals", (2013) J. Mater. Chem. A DOI: 10.1039C3TA13316H...

  18. Strong Second Harmonic Generation from the Tantalum Thioarsenates...

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

    Strong Second Harmonic Generation from the Tantalum Thioarsenates A3Ta2AsS11 (A K and ... and exhibit strong nonlinear optical (NLO) second harmonic generation (SHG) response. ...

  19. Notice of Intent to Investigate

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    4, 2014 Dr. Charles F. McMillan President and Laboratory Director Los Alamos National Security, LLC Mail Stop A-100, Drop Point 03140071S Bikini Atoll Road, TA-3 Los Alamos, New...

  20. Concentration-dependent short-range order in the relaxor ferroelectric...

    Office of Scientific and Technical Information (OSTI)

    Concentration-dependent short-range order in the relaxor ferroelectric (1-x)Pb(Sc,Ta)Osubscript 3-x PbTiOsubscript 3 Citation Details In-Document Search Title: ...

  1. Enterprise Assessments Targeted Review of the Targeted Review...

    Office of Environmental Management (EM)

    ... in the TA-55 DSA. The intent of the ISIs is to periodically ensure that the design ... ISIs for the PF-4 SC confinement system include a visual inspection of visible portions of ...

  2. CX-006855: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Rocket Centrifuge Removal (Eastern Side of TA-II)CX(s) Applied: B1.23Date: 09/12/2011Location(s): Albuquerque, New MexicoOffice(s): NNSA-Headquarters, Golden Field Office

  3. Chapter 8: Advancing Clean Transportation and Vehicle Systems...

    Energy Savers [EERE]

    ... 3 TA 8.E: Plug-In Electric Vehicles Batteries Figure 8.E.3 Battery Performance ... For use in EVs, current batteries for 40-mile PHEV application are approximately two to ...

  4. NNMCAB Committee Minutes : September 2014 Pojoaque | Department of Energy

    Office of Environmental Management (EM)

    Minutes : September 2014 Pojoaque NNMCAB Committee Minutes : September 2014 Pojoaque At This Meeting: TA-21 Water Towers Introduction of Kiki Torres Sub-Committee Breakout Session Election of Officers for FY'15 PDF icon Combined Committee Minutes - September 10, 2014

  5. NNMCAB Committee Minutes: January 2013 Pojoaque | Department of Energy

    Office of Environmental Management (EM)

    3 Pojoaque NNMCAB Committee Minutes: January 2013 Pojoaque At This Meeting: LANL TA-54 33 Shafts Waste Management Conference February 2013 Presentation LANL, Biological and Human Health Assessments, Rich Mirenda PDF icon Combined Committee Minutes - January 9, 2013

  6. Sustainable NREL - Site Sustainability Plan FY 2016 (Management Publication), NREL (National Renewable Energy Laboratory)

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

    Sustainable NREL S I T E S U S TA I N A B I L I T Y P L A N F Y 2 0 1 6 Nomenclature ..................................................................................................................................................iv Executive Summary ...................................................................................................................................... v Greenhouse Gas Reduction

  7. Potential for the Use of Energy Savings Performance Contracts...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ... from l'ta<; B... Again, these are dealt with through the contract clauses that are standard in every ESPC. ...

  8. 2010-01 "Disposition of Remote-Handled Waste Buried in 33 Shafts...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    The intent of this recommendation is to remove the highly radioactive RH-TRU wastes from TA-54 in a safe manner with a minimum of radiation exposure to workers at all levels. ...

  9. Vermont Agency of Transportation Work Within Highway Rights-of...

    Open Energy Info (EERE)

    GuidancePermittingRegulatory GuidanceGuideHandbook Abstract Guidance on the 19 V.S.A. 1111 Highway Right-of-Way Permit Application (Form TA 210). Author Vermont...

  10. 19 V.S.A. 1111 Highway Right-of-Way Permit Application (Form...

    Open Energy Info (EERE)

    V.S.A. 1111 Highway Right-of-Way Permit Application (Form TA 210) Example Jump to: navigation, search OpenEI Reference LibraryAdd to library PermittingRegulatory Guidance -...

  11. WTIOWu L LBAD COLPANY

    Office of Legacy Management (LM)

    Although there was no designad ventilation a the loftlm , air dust samples reveal no ... Beeathing avce and general air sampleP were ta en before and duri several runs to ...

  12. Weyl Fermions Discovered After 85 Years

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

    theorized 85 years ago: the Weyl fermion. It was detected as an emergent quasiparticle in synthetic crystals of the semimetal, tantalum arsenide (TaAs). Using angle-resolved...

  13. WELCOME TO LOS ALAMOS NATIONAL LABORATORY

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

    New Hire Orientation Agenda* Day 1 Otowi - Casa Grande Drive TA-03-261, Room F200W Main Gate Conference Room, Contact 667-1555 Time Event Presented By 10:15 - 10:30 New Hire...

  14. Weyl Fermions Discovered After 85 Years

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

    Weyl Fermions Discovered After 85 Years Print An international team led by Princeton University scientists has discovered an elusive massless particle first theorized 85 years ago: the Weyl fermion. It was detected as an emergent quasiparticle in synthetic crystals of the semimetal, tantalum arsenide (TaAs). Using angle-resolved photoemission spectroscopy (ARPES), the researchers studied the surface and bulk band structure of TaAs. The results exhibit the features-cones, nodes, and arcs-that

  15. Weyl Fermions Discovered After 85 Years

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

    Weyl Fermions Discovered After 85 Years Print An international team led by Princeton University scientists has discovered an elusive massless particle first theorized 85 years ago: the Weyl fermion. It was detected as an emergent quasiparticle in synthetic crystals of the semimetal, tantalum arsenide (TaAs). Using angle-resolved photoemission spectroscopy (ARPES), the researchers studied the surface and bulk band structure of TaAs. The results exhibit the features-cones, nodes, and arcs-that

  16. Weyl Fermions Discovered After 85 Years

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

    Weyl Fermions Discovered After 85 Years Print An international team led by Princeton University scientists has discovered an elusive massless particle first theorized 85 years ago: the Weyl fermion. It was detected as an emergent quasiparticle in synthetic crystals of the semimetal, tantalum arsenide (TaAs). Using angle-resolved photoemission spectroscopy (ARPES), the researchers studied the surface and bulk band structure of TaAs. The results exhibit the features-cones, nodes, and arcs-that

  17. Weyl Fermions Discovered After 85 Years

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

    Weyl Fermions Discovered After 85 Years Print An international team led by Princeton University scientists has discovered an elusive massless particle first theorized 85 years ago: the Weyl fermion. It was detected as an emergent quasiparticle in synthetic crystals of the semimetal, tantalum arsenide (TaAs). Using angle-resolved photoemission spectroscopy (ARPES), the researchers studied the surface and bulk band structure of TaAs. The results exhibit the features-cones, nodes, and arcs-that

  18. Weyl Fermions Discovered After 85 Years

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

    Weyl Fermions Discovered After 85 Years Print An international team led by Princeton University scientists has discovered an elusive massless particle first theorized 85 years ago: the Weyl fermion. It was detected as an emergent quasiparticle in synthetic crystals of the semimetal, tantalum arsenide (TaAs). Using angle-resolved photoemission spectroscopy (ARPES), the researchers studied the surface and bulk band structure of TaAs. The results exhibit the features-cones, nodes, and arcs-that

  19. Weyl Fermions Discovered After 85 Years

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

    Weyl Fermions Discovered After 85 Years Print An international team led by Princeton University scientists has discovered an elusive massless particle first theorized 85 years ago: the Weyl fermion. It was detected as an emergent quasiparticle in synthetic crystals of the semimetal, tantalum arsenide (TaAs). Using angle-resolved photoemission spectroscopy (ARPES), the researchers studied the surface and bulk band structure of TaAs. The results exhibit the features-cones, nodes, and arcs-that

  20. Next Big Idea coming September 14-15

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

    Newsletters Newsletters December 31, 2015 Sewage Treatment Facility at TA-21 before demolition December 2015 Newsletter - Los Alamos Field Office Legacy Cleanup December 2015 Newsletter - Los Alamos Field Office Legacy Cleanup November 30, 2015 TA-21-286 being demolished November 2015 Newsletter - Los Alamos Field Office Legacy Cleanup November 2015 Newsletter - Los Alamos Field Office Legacy Cleanup

    Newsletters Newsletters The U.S. Department of Energy Office of Indian Energy newsletters

  1. 22680

    Energy Savers [EERE]

    QUARTERLY PROGRAM REPORT State: __________________ Budget period: / / - / / Grant Number: __________________ I. GRANT OUTLAYS - FUNDS SUBJECT TO DOE PROGRAM RULES (rounded to the nearest dollar) DOE F 540.3 (08/05) OMB Control No. 1910-5127 Expiration Date: 6/30/08 A. OUTLAYS BY FUND SOURCE DOE Other funds included in grant budget, section A B. OUTLAYS BY FUNCTION Grantee Administration Subgrantee Administration Grantee T&TA Subgrantee T&TA Program Operations Total Health and Safety

  2. November 2015 Newsletter - Los Alamos Field Office Legacy Cleanup |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy November 2015 Newsletter - Los Alamos Field Office Legacy Cleanup November 2015 Newsletter - Los Alamos Field Office Legacy Cleanup November 30, 2015 - 12:00pm Addthis TA-21-286 being demolished TA-21-286 being demolished Safety Safety and health record for October is clean Safe storage plan for nitrate salts has been completed and implemented. Contracts/Acquisition Removing concrete at the airport landfill Los Alamos Legacy Cleanup Bridge Contract commenced October 1

  3. 05-19-2010 NNSA-B-10-0188

    National Nuclear Security Administration (NNSA)

    188 Sandia National Laboratories/New Mexico (SNL/NM) proposes to relocate two T-Buildings, T-75 and T-42. Their current location is the northeast corner of 14th Street and Hardin Boulevard in southeast TA-I. The proposed new location is in TA-IV. ✖ Sandia Site Office Relocate T-Buildings T42 and T75 Sandia National Laboratories - New Mexico LACY,SUSAN DOYLENE 05/19/2010

  4. Evaluation Project 4492

    National Nuclear Security Administration (NNSA)

    12-2010 NNSA-B-10-0412 Sandia National Laboratories/New Mexico (SNL/NM) proposes to support the Bio-Response Operational Testing and Evaluation (BOTE) project. The BOTE project would involve multiple releases of a biological simulant, characterization sampling, decontamination, and clearance sampling, at the Idaho National Laboratory (INL) Test Site. Sandia Site Office Bio-Response Operational Testing and Evaluation (BOTE) Project (TA-I, TA-III, & Offsite at INL) INL LACY,SUSAN DOYLENE

  5. On the modeling of the Taylor cylinder impact test for orthotropic textured materials: Calculations and experiments

    SciTech Connect (OSTI)

    Maudlin, P.J.; Bingert, J.F.; House, J.W.

    1997-04-01

    Taylor impact tests using specimens cut from a rolled plate of Ta were conducted. The Ta was well-characterized in terms of flow stress and crystallographic texture. A piece-wise yield surface was interrogated from this orthotropic texture, and used in EPIC-95 3D simulations of the Taylor test. Good agreement was realized between the calculations and the post-test geometries in terms of major and minor side profiles and impact-interface footprints.

  6. Historic Properties

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

    Historic Properties Historic Properties Our environmental stewardship commitment: we will cleanup the past, minimize impacts for current environmental operations, and create a sustainable future. April 12, 2012 TA-18-0001, site of the 1946 Louis Slotin criticality accident TA-18-0001, site of the 1946 Louis Slotin criticality accident, which significantly influenced future criticality safety programs. Contact Environmental Communication & Public Involvement P.O. Box 1663 MS M996 Los Alamos,

  7. Amorphorized tantalum-nickel binary films for metal gate applications

    SciTech Connect (OSTI)

    Ouyang, Jiaomin; Wongpiya, Ranida; Clemens, Bruce M.; Deal, Michael D.; Nishi, Yoshio

    2015-04-13

    Amorphous metal gates have the potential to eliminate the work function variation due to grain orientation for poly-crystalline metal gate materials, which is a leading contributor to threshold voltage variation for small transistors. Structural and electrical properties of TaNi alloys using co-sputtering with different compositions and multilayer structures with different thicknesses are investigated in this work. It is found that TaNi films are amorphous for a wide range of compositions as deposited, and the films stay amorphous after annealing at 400?C in RTA for 1?min and up to at least 700?C depending on the composition. The amorphous films eventually crystallize into Ni, Ta, and TaNi{sub 3} phases at high enough temperature. For multilayer Ta/Ni structures, samples with individual layer thickness of 0.12?nm and 1.2?nm are amorphous as deposited due to intermixing during deposition, and stay amorphous until annealed at 500?C. The resistivity of the films as-deposited are around 200 ??cm. The work function of the alloy is fixed at close to the Ta work function of 4.6?eV for a wide range of compositions. This is attributed to the segregation of Ta at the metal-oxide interface, which is confirmed by XPS depth profile. Overall, the excellent thermal stability and low resistivity makes this alloy system a promising candidate for eliminating work function variation for gate last applications, as compared to crystalline Ta or TiN gates.

  8. A Window on Surface Explosions: Tartaric Acid on Cu(110)

    SciTech Connect (OSTI)

    Mhatre, B. S.; Pushkarev, V.; Holsclaw, B.; Lawton, T. J.; Sykes, E. C. H.; Gellman, A. J.

    2013-04-18

    Autocatalytic reaction mechanisms are observed in a range of important chemical processes including catalysis, radical-mediated explosions, and biosynthesis. Because of their complexity, the microscopic details of autocatalytic reaction mechanisms have been difficult to study on surfaces and heterogeneous catalysts. Autocatalytic decomposition reactions of S,S- and R,R-tartaric acid (TA) adsorbed on Cu(110) offer molecular-level insight into aspects of these processes, which until now, were largely a matter of speculation. The decomposition of TA/Cu(110) is initiated by a slow, irreversible process that forms vacancies in the adsorbed TA layer, followed by a vacancy-mediated, explosive decomposition process that yields CO{sub 2} and small hydrocarbon products. Initiation of the explosive decomposition of TA/Cu(110) has been studied by measurement of the reaction kinetics, time-resolved low energy electron diffraction (LEED), and time-resolved scanning tunneling microscopy (STM). Initiation results in a decrease in the local coverage of TA and a concomitant increase in the areal vacancy concentration. Observations of explosive TA decomposition on the Cu(651)S surface suggest that initiation does not occur at structural defects in the surface, as has been suggested in the past. Once the vacancy concentration reaches a critical value, the explosive, autocatalytic decomposition step dominates the TA decomposition rate. The onset of the explosive decomposition of TA on Cu(110) is accompanied by the extraction of Cu atoms from the surface to form a (±6,7; {-+}2,1) overlayer that is readily observable using LEED and STM. The explosive decomposition step is second-order in vacancy concentration and accelerates with increasing extent of reaction.

  9. Microsoft Word - 2013 IWD #3155 Trident Target Area Operations.docx

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

    2100 (4/12) Form 2100 Integrated Work Document (IWD) Part 1, Activity Specific Information IWD #: 3155 Activity/Task Title Trident Target Area Operations Work Document # Planner/Preparer (Name/Z #/Date) Sha-Marie Reid TA 35 Building 189 Room 108, 120 Other Location(s)(TA) as required Activity Description/Overview: This IWD covers operation of both Trident target areas including normal maintenance, setting up beam lines, firing laser shots, and other misc activities. Hazard Analysis (HA) Method

  10. NEPA Determination Form

    National Nuclear Security Administration (NNSA)

    LA NEPA COMPLIANCE DETERMINATION FORM PRID - 09P-0059 V2 Page 1 of 8 Project/Activity Title: TA-3 Substation Replacement Project PRID: 09P-0059 V2 Date: February 16, 2016 Purpose: The proposed demolition and replacement of the Los Alamos National Laboratory's (LANL) Technical Area (TA)-3 electrical power substation is needed to provide reliable and efficient electrical distribution systems with sufficient electrical capacity to support the national security missions. The electrical distribution

  11. Fabrication of fine-grain tantalum diffusion barrier tube for Nb{sub 3}Sn conductors

    SciTech Connect (OSTI)

    Hartwig, K. T.; Balachandran, S.; Mezyenski, R.; Seymour, N.; Robinson, J.; Barber, R. E.

    2014-01-27

    Diffusion barriers used in Nb{sub 3}Sn wire are often fabricated by wrapping Ta sheet into a tube with an overlap seam. A common result of such practice is non-uniform deformation in the Ta sheet as it thins by wire drawing because of non-uniform grain size and texture in the original Ta sheet. Seamless Ta tube with a fine-grain and uniform microstructure would be much better for the diffusion barrier application, but such material is expensive and difficult to manufacture. This report presents results on a new fabrication strategy for Ta tube that shows promise for manufacture of less costly tube with an improved microstructure. The fabrication method begins with seam-welded tube but gives a fine-grain uniform microstructure with little difference between the longitudinal seam weld region and the parent metal after post-weld processing. Severe plastic deformation processing (SPD) applied by area reduction extrusion and tube equal channel angular extrusion (tECAE) are used to refine and homogenize the microstructure. Microstructure and mechanical property results are presented for Ta tubes fabricated by this new processing strategy.

  12. dI UNIVERSITY OF NEV\DA SYSTEM

    Office of Legacy Management (LM)

    g3t4 6 dI UNIVERSITY OF NEV\DA SYSTEM tw ?r@ D O E / D P / O 1 2 6 3 - 2 0 L , n z l t P ' " WATER RESOURCES CENTER itf.l This report was prepared as an aecount of work sponsore$ by the United States Government. Neither the United States nor the United States Department of Energy, nor any of their employees, mal assumes any legal liability or responsib usefulness of any informationr apparatus' I that its use would not infringe privately speeifie eommereial produetr proeesst ufacturen, or

  13. Aerosol indirect effects -- general circulation model intercomparison and evaluation with satellite data

    SciTech Connect (OSTI)

    Quaas, Johannes; Ming, Yi; Menon, Surabi; Takemura, Toshihiko; Wang, Minghuai; Penner, Joyce E.; Gettelman, Andrew; Lohmann, Ulrike; Bellouin, Nicolas; Boucher, Olivier; Sayer, Andrew M.; Thomas, Gareth E.; McComiskey, Allison; Feingold, Graham; Hoose, Corinna; Kristjansson, Jon Egill; Liu, Xiaohong; Balkanski, Yves; Donner, Leo J.; Ginoux, Paul A.; Stier, Philip; Feichter, Johann; Sednev, Igor; Bauer, Susanne E.; Koch, Dorothy; Grainger, Roy G.; Kirkevag, Alf; Iversen, Trond; Seland, Oyvind; Easter, Richard; Ghan, Steven J.; Rasch, Philip J.; Morrison, Hugh; Lamarque, Jean-Francois; Iacono, Michael J.; Kinne, Stefan; Schulz, Michael

    2009-04-10

    Aerosol indirect effects continue to constitute one of the most important uncertainties for anthropogenic climate perturbations. Within the international AEROCOM initiative, the representation of aerosol-cloud-radiation interactions in ten different general circulation models (GCMs) is evaluated using three satellite datasets. The focus is on stratiform liquid water clouds since most GCMs do not include ice nucleation effects, and none of the model explicitly parameterizes aerosol effects on convective clouds. We compute statistical relationships between aerosol optical depth (Ta) and various cloud and radiation quantities in a manner that is consistent between the models and the satellite data. It is found that the model-simulated influence of aerosols on cloud droplet number concentration (Nd) compares relatively well to the satellite data at least over the ocean. The relationship between Ta and liquid water path is simulated much too strongly by the models. It is shown that this is partly related to the representation of the second aerosol indirect effect in terms of autoconversion. A positive relationship between total cloud fraction (fcld) and Ta as found in the satellite data is simulated by the majority of the models, albeit less strongly than that in the satellite data in most of them. In a discussion of the hypotheses proposed in the literature to explain the satellite-derived strong fcld - Ta relationship, our results indicate that none can be identified as unique explanation. Relationships similar to the ones found in satellite data between Ta and cloud top temperature or outgoing long-wave radiation (OLR) are simulated by only a few GCMs. The GCMs that simulate a negative OLR - Ta relationship show a strong positive correlation between Ta and fcld The short-wave total aerosol radiative forcing as simulated by the GCMs is strongly influenced by the simulated anthropogenic fraction of Ta, and parameterisation assumptions such as a lower bound on Nd. Nevertheless, the strengths of the statistical relationships are good predictors for the aerosol forcings in the models. An estimate of the total short-wave aerosol forcing inferred from the combination of these predictors for the modelled forcings with the satellite-derived statistical relationships yields a global annual mean value of -1.5+-0.5 Wm-2. An alternative estimate obtained by scaling the simulated clear- and cloudy-sky forcings with estimates of anthropogenic Ta and satellite-retrieved Nd - Ta regression slopes, respectively, yields a global annual mean clear-sky (aerosol direct effect) estimate of -0.4+-0.2 Wm-2 and a cloudy-sky (aerosol indirect effect) estimate of -0.7+-0.5 Wm-2, with a total estimate of -1.2+-0.4 Wm-2.

  14. Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award

    Broader source: Energy.gov [DOE]

    Developed jointly by Da Vinci Emissions Services Ltd., Cummins Inc., and Oak Ridge National Laboratory (ORNL), the Da Vinci Fuel-in-Oil (DAFIO) technology uses a fiber optic probe to obtain real-time measurements of oil in an operating engine to quantify the fuel dissolved in the lubricant oil.

  15. 70 DA WHITE DWARFS IDENTIFIED IN LAMOST PILOT SURVEY

    SciTech Connect (OSTI)

    Zhao, J. K.; Luo, A. L.; Zhao, G. [Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Oswalt, T. D., E-mail: zjk@bao.ac.cn, E-mail: gzhao@bao.ac.cn, E-mail: lal@bao.ac.cn, E-mail: toswalt@fit.edu [Physics and Space Science Department, Florida Institute of Technology, Melbourne, FL 32901 (United States)

    2013-06-01

    We present a spectroscopically identified catalog of 70 DA white dwarfs (WDs) from the LAMOST pilot survey. Thirty-five are found to be new identifications after cross-correlation with the Eisenstein et al. and Villanova catalogs. The effective temperature and gravity of these WDs are estimated by Balmer lines fitting. Most of them are hot WDs. The cooling times and masses of these WDs are estimated by interpolation in theoretical evolution tracks. The peak of the mass distribution is found to be {approx}0.6 M {sub Sun }, which is consistent with prior work in the literature. The distances of these WDs are estimated using the method of synthetic spectral distances. All of these WDs are found to be in the Galactic disk from our analysis of space motions. Our sample supports the expectation that WDs with high mass are concentrated near the plane of the Galactic disk.

  16. Environmental Barrier Coatings for the Energy Efficient Heat Engines Program

    SciTech Connect (OSTI)

    Katherine Faber

    2004-10-31

    This program aimed to develop a fundamental understanding of the microstructural, mechanical, and chemical properties of Ta{sub 2}O{sub 5}-based coatings for Si{sub 3}N{sub 4} (AS800) substrates and optimize such coatings for environmental barriers. The program consisted of three tasks: processing of Ta{sub 2}O{sub 5} coatings, phase and microstructural development, and life-limiting phenomena. Northwestern University formed a cross-functional team with Lehigh University, Honeywell Inc., and Oak Ridge National Laboratory. The major accomplishments are: (1) Conditions for the plasma spray of Ta{sub 2}O{sub 5} and its alloys were optimized to provide maximum density and thickness. (2) Adherent small particle plasma spray coatings of Ta{sub 2}O{sub 5} can be routinely prepared. (3) Ta{sub 2}O{sub 5} can be stabilized against its disruptive phase transformation to 1400 C by the addition of one or more oxides of Al, La, and/or Nb. (4) Residual stresses in the Ta{sub 2}O{sub 5} coatings were measured using X-rays and changed with thermal exposure. (5) Properly doped coatings are more resistant against thermal cycling than undoped coatings, and can be cycled many thousand times without spallation. (6) Water vapor testing in the ORNL Keiser Rig of adherent coatings showed that undoped Ta{sub 2}O{sub 5} is not an effective barrier at preventing chemical changes to the AS800. (7) Limited water vapor testing of doped and adherent coatings, which had successfully survived many thermal cycles, showed that in the water vapor environment, de-cohesion may occur.

  17. PanDaTox: a tool for accelerated metabolic engineering (Journal Article) |

    Office of Scientific and Technical Information (OSTI)

    SciTech Connect PanDaTox: a tool for accelerated metabolic engineering Citation Details In-Document Search Title: PanDaTox: a tool for accelerated metabolic engineering Metabolic engineering is often facilitated by cloning of genes encoding enzymes from various heterologous organisms into E. coli. Such engineering efforts are frequently hampered by foreign genes that are toxic to the E. coli host. We have developed PanDaTox (www.weizmann.ac.il/pandatox), a web-based resource that provides

  18. Near-UV absorption in very cool DA white dwarfs

    SciTech Connect (OSTI)

    Saumon, D.; Holberg, J. B.; Kowalski, P. M. E-mail: holberg@argus.lpl.arizona.edu

    2014-07-20

    The atmospheres of very cool, hydrogen-rich white dwarfs (WDs) (T{sub eff} < 6000 K) are challenging to model because of the increased complexity of the equation of state, chemical equilibrium, and opacity sources in a low-temperature, weakly ionized dense gas. In particular, many models that assume relatively simple models for the broadening of atomic levels and mostly ideal gas physics overestimate the flux in the blue part of their spectra. A solution to this problem that has met with some success is that additional opacity at short wavelengths comes for the extreme broadening of the Lyman ? line of atomic H by collisions primarily with H{sub 2}. For the purpose of validating this model more rigorously, we acquired Hubble Space Telescope STIS spectra of eight very cool WDs (five DA and three DC stars). Combined with their known parallaxes, BVRIJHK, and Spitzer IRAC photometry, we analyze their entire spectral energy distribution (from 0.24 to 9.3 ?m) with a large grid of model atmospheres and synthetic spectra. We find that the red wing of the Lyman ? line reproduces the rapidly decreasing near-UV flux of these very cool stars very well. We determine better constrained values of T{sub eff} and gravity as well as upper limits to the helium abundance in their atmospheres.

  19. Nature of Catalytic Active Sites Present on the Surface of Advanced Bulk Tantalum Mixed Oxide Photocatalysts

    SciTech Connect (OSTI)

    Phivilay, Somphonh; Puretzky, Alexander A; Domen, Kazunari Domen; Wachs, Israel

    2013-01-01

    The most active photocatalyst system for water splitting under UV irradiation (270 nm) is the promoted 0.2%NiO/NaTaO3:2%La photocatalyst with optimized photonic efficiency (P.E.) of 56%, but fundamental issues about the nature of the surface catalytic active sites and their involvement in the photocatalytic process still need to be clarified. This is the first study to apply cutting edge surface spectroscopic analyses to determine the surface nature of tantalum mixed oxide photocatalysts. Surface analysis with HR-XPS (1-3nm) and HS-LEIS (0.3nm) spectroscopy indicates that the NiO and La2O3 promoters are concentrated in the surface region of the bulk NaTaO3 phase. The La2O3 is concentrated on the NaTaO3 outermost surface layers while NiO is distributed throughout the NaTaO3 surface region (1-3nm). Raman and UV-vis spectroscopy revealed that the bulk molecular and electronic structures, respectively, of NaTaO3 were not modified by the addition of the La2O3 and NiO promoters, with La2O3 resulting in a slightly more ordered structure. Photoluminescence (PL) spectroscopy reveals that the addition of La2O3 and NiO produces a greater number of electron traps resulting in the suppression of the recombination of excited electrons/holes. In contrast to earlier reports, the La2O3 is only a textural promoter (increasing the BET surface area ~7x by stabilizing smaller NaTaO3 particles), but causes a ~3x decrease in the specific photocatalytic TORs ( mol H2/m2/h) rate because surface La2O3 blocks exposed catalytic active NaTaO3 sites. The NiO promoter was found to be a potent electronic promoter that enhances the NaTaO3 surface normalized TORs by a factor of ~10-50 and TOF by a factor of ~10. The level of NiO promotion is the same in the absence and presence of La2O3 demonstrating that there is no promotional synergistic interaction between the NiO and La2O3 promoters. This study demonstrates the important contributions of the photocatalyst surface properties to the fundamental molecular/electronic structure-photoactivity relationships of promoted NaTaO3 photocatalysts that were previously not appreciated in the literature.

  20. Oxidation state and interfacial effects on oxygen vacancies in tantalum pentoxide

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Bondi, Robert J.; Marinella, Matthew J.

    2015-02-28

    First-principles density-functional theory (DFT) calculations are used to study the atomistic structure, structural energetics, and electron density near the O monovacancy (VOn; n=0,1+,2+) in both bulk, amorphous tantalum pentoxide (a-Ta2O5) and also at vacuum and metallic Ta interfaces. We calculate multivariate vacancy formation energies to evaluate stability as a function of oxidation state, distance from interface plane, and Fermi energy. VOn of all oxidation states preferentially segregate at both Ta and vacuum interfaces, where the metallic interface exhibits global formation energy minima. In a-Ta2O5, VO0 are characterized by structural contraction and electron density localization, while VO2+ promote structural expansion andmore » are depleted of electron density. In contrast, interfacial VO0 and VO2+ show nearly indistinguishable ionic and electronic signatures indicative of a reduced VO center. Interfacial VO2+ extract electron density from metallic Ta indicating VO2+ is spontaneously reduced at the expense of the metal. This oxidation/reduction behavior suggests careful selection and processing of both oxide layer and metal electrodes for engineering memristor device operation.« less

  1. Facile synthesis of efficient photocatalytic tantalum nitride nanoparticles

    SciTech Connect (OSTI)

    Wang, Zheng; Wang, Jiangting; Hou, Jungang; Huang, Kai; Jiao, Shuqiang; Zhu, Hongmin

    2012-11-15

    Graphical abstract: Tantalum nitride nanoparticles as a visible-light-driven photocatalyst prepared by a novel homogeneously chemical reduction of tantalum pentachloride using sodium in liquid ammonia and the morphologies, visible-light photocatalytic properties and stability of tantalum nitride nanoparticles were investigated. Highlights: ? Tantalum nitride nanoparticles have been prepared by a homogeneously chemical reduction. ? The crystal structure of tantalum nitride was determined by Rietveld refinement and XRD patterns. ? The Tantalum nitride nanoparticle size was in the range of 2050 nm. ? Much high photocatalytic activities of Ta{sub 3}N{sub 5} nanoparticles were obtained under visible-light irradiation. -- Abstract: Tantalum nitride nanoparticles, as visible-light photocatalysts were synthesized by a two-step homogeneously chemical reduction without any polymers and templates. The well-crystallized Ta{sub 3}N{sub 5} nanoparticles with a range of 2050 nm in size have been characterized by a number of techniques, such as XRD, XPS, SEM, TEM, BET and UVVis spectrum. Most importantly, the Ta{sub 3}N{sub 5} nanoparticles with good stability exhibited higher photooxidation activities in the water splitting and degradation of methylene blue under visible light irradiation than bulk Ta{sub 3}N{sub 5} particles and commercial P25 TiO{sub 2}, demonstrating that Ta{sub 3}N{sub 5} nanoparticle is a promising candidate as a visible-light photocatalyst.

  2. Oxidation state and interfacial effects on oxygen vacancies in tantalum pentoxide

    SciTech Connect (OSTI)

    Bondi, Robert J. Marinella, Matthew J.

    2015-02-28

    First-principles density-functional theory calculations are used to study the atomistic structure, structural energetics, and electron density near the O monovacancy (V{sub O}{sup n}; n?=?0,1+,2+) in both bulk, amorphous tantalum pentoxide (a-Ta{sub 2}O{sub 5}), and also at vacuum and metallic Ta interfaces. We calculate multivariate vacancy formation energies to evaluate stability as a function of oxidation state, distance from interface plane, and Fermi energy. V{sub O}{sup n} of all oxidation states preferentially segregates at both Ta and vacuum interfaces, where the metallic interface exhibits global formation energy minima. In a-Ta{sub 2}O{sub 5}, V{sub O}{sup 0} is characterized by structural contraction and electron density localization, while V{sub O}{sup 2+} promotes structural expansion and is depleted of electron density. In contrast, interfacial V{sub O}{sup 0} and V{sub O}{sup 2+} show nearly indistinguishable ionic and electronic signatures indicative of a reduced V{sub O} center. Interfacial V{sub O}{sup 2+} extracts electron density from metallic Ta, indicating that V{sub O}{sup 2+} is spontaneously reduced at the expense of the metal. This oxidation/reduction behavior suggests careful selection and processing of both oxide layer and metal electrodes for engineering memristor device operation.

  3. Multiple Syntrophic Interactions in a Terephthalate-Degrading Methanogenic Consortium

    SciTech Connect (OSTI)

    Lykidis, Athanasios; Chen, Chia-Lung; Tringe, Susannah G.; McHardy, Alice C.; Copeland, Alex 5; Kyrpides, Nikos C.; Hugenholtz, Philip; Liu, Wen-Tso

    2010-08-05

    Terephthalate (TA) is one of the top 50 chemicals produced worldwide. Its production results in a TA-containing wastewater that is treated by anaerobic processes through a poorly understood methanogenic syntrophy. Using metagenomics, we characterized the methanogenic consortium tinside a hyper-mesophilic (i.e., between mesophilic and thermophilic), TA-degrading bioreactor. We identified genes belonging to dominant Pelotomaculum species presumably involved in TA degradation through decarboxylation, dearomatization, and modified ?-oxidation to H{sub 2}/CO{sub 2} and acetate. These intermediates are converted to CH{sub 4}/CO{sub 2} by three novel hyper-mesophilic methanogens. Additional secondary syntrophic interactions were predicted in Thermotogae, Syntrophus and candidate phyla OP5 and WWE1 populations. The OP5 encodes genes capable of anaerobic autotrophic butyrate production and Thermotogae, Syntrophus and WWE1 have the genetic potential to oxidize butyrate to COsub 2}/H{sub 2} and acetate. These observations suggest that the TA-degrading consortium consists of additional syntrophic interactions beyond the standard H{sub 2}-producing syntroph ? methanogen partnership that may serve to improve community stability.

  4. Final environmental assessment: TRU waste drum staging building, Technical Area 55, Los Alamos National Laboratory

    SciTech Connect (OSTI)

    1996-02-09

    Much of the US Department of Energy`s (DOE`s) research on plutonium metallurgy and plutonium processing is performed at Los Alamos National Laboratory (LANL), in Los Alamos, New Mexico. LANL`s main facility for plutonium research is the Plutonium Facility, also referred to as Technical Area 55 (TA-55). The main laboratory building for plutonium work within the Plutonium Facility (TA-55) is the Plutonium Facility Building 4, or PF-4. This Environmental Assessment (EA) analyzes the potential environmental effects that would be expected to occur if DOE were to stage sealed containers of transuranic (TRU) and TRU mixed waste in a support building at the Plutonium Facility (TA-55) that is adjacent to PF-4. At present, the waste containers are staged in the basement of PF-4. The proposed project is to convert an existing support structure (Building 185), a prefabricated metal building on a concrete foundation, and operate it as a temporary staging facility for sealed containers of solid TRU and TRU mixed waste. The TRU and TRU mixed wastes would be contained in sealed 55-gallon drums and standard waste boxes as they await approval to be transported to TA-54. The containers would then be transported to a longer term TRU waste storage area at TA-54. The TRU wastes are generated from plutonium operations carried out in PF-4. The drum staging building would also be used to store and prepare for use new, empty TRU waste containers.

  5. Individual identification of free hole and electron dynamics in CuIn{sub 1?x}Ga{sub x}Se{sub 2} thin films by simultaneous monitoring of two optical transitions

    SciTech Connect (OSTI)

    Okano, Makoto; Hagiya, Hideki; Sakurai, Takeaki; Akimoto, Katsuhiro; Shibata, Hajime; Niki, Shigeru; Kanemitsu, Yoshihiko

    2015-05-04

    The photocarrier dynamics of CuIn{sub 1?x}Ga{sub x}Se{sub 2} (CIGS) thin films were studied using white-light transient absorption (TA) measurements, as an understanding of this behavior is essential for improving the performance of solar cells composed of CIGS thin films. A characteristic double-peak structure due to the splitting of the valence bands in the CIGS was observed in the TA spectra under near-band-gap resonant excitation. From a comparison of the TA decay dynamics monitored at these two peaks, it was found that the slow-decay components of the electron and hole relaxation are on the nanosecond timescale. This finding is clear evidence of the long lifetimes of free photocarriers in polycrystalline CIGS thin films.

  6. Aging of niobium and tantalum tritides: Evolution of hardness in comparison with other properties

    SciTech Connect (OSTI)

    Schober, T.; Dieker, C.; Trinkaus, H.

    1989-01-01

    Vickers hardness measurements on niobium and tantalum tritides of initial composition NbT/sub 0.0225/ and TaT/sub 0.097/, respectively, performed over the first 20 months after T charging, are reported and interpreted. For both tritides, the hardness increases monotonically, but in a decelerating rate, with the /sup 3/ He concentration built up upon T transmutation. At given /sup 3/ He concentration, the increase per unit /sup 3/ He concentration is stronger for Nb than for Ta. To interpret the observed hardness evolution, existing hardening theories are adjusted to the present microstructural situations. It is concluded that the microstructure developing on /sup 3/ He precipitation is more disperse in the Nb tritide than in the Ta tritide. These findings are supported by conclusions drawn previously from swelling, acoustic emission, and x-ray diffraction measurements of these materials.

  7. CY16.AShot_Calendar copy

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

    Subject to Change 2/19/16 Experiment Week Number Monday Friday Holidays/Conferences Titan Short Pulse West Beam Titan Long Pulse East Beam Janus TA 1 East Beam Janus TA 1 West Beam COMET Europa Janus TA 2 Setup Room Plant Disruptions Visitors Remarks 1 1 1 1 1/2 2 2 2 2/ /3 3 9 10 11 12 13 14 15 16 17 18 19 20 29-Feb 7-Mar 14-Mar 21-Mar 28-Mar 4-Apr 11-Apr 18-Apr 25-Apr 2-May 9-May 16-May 4-Mar 11-Mar 18-Mar 25-Mar 1-Apr 8-Apr 15-Apr 22-Apr 29-Apr 6-May 13-May 20-May Monday IPAC Kantsyrev Setup

  8. Ternary metal-rich sulfide with a layered structure

    DOE Patents [OSTI]

    Franzen, Hugo F.; Yao, Xiaoqiang

    1993-08-17

    A ternary Nb-Ta-S compound is provided having the atomic formula, Nb.sub.1.72 Ta.sub.3.28 S.sub.2, and exhibiting a layered structure in the sequence S-M3-M2-M1-M2-M3-S wherein S represents sulfur layers and M1, M2, and M3 represent Nb/Ta mixed metal layers. This sequence generates seven sheets stacked along the [001] direction of an approximate body centered cubic crystal structure with relatively weak sulfur-to-sulfur van der Waals type interactions between adjacent sulfur sheets and metal-to-metal bonding within and between adjacent mixed metal sheets.

  9. Measurement of Fresh Fuel Rods to Demonstrate Compliance with Criticality Safety Limits

    SciTech Connect (OSTI)

    Miko, David K.; Desimone, David J.

    2015-11-03

    In order to operate TA-66 as a radiological facility with the quantity of nuclear material required to fulfil its mission, a criticality safety evaluation was required. This evaluation defined the control parameters for operations at the facility. The resulting evaluation for TA-66 placed limits on the amount of SNM, as well as other materials such as beryllium. In addition, there is a limit on the number of uranium fuel rods allowed subject to enrichment, outer diameter, and overall length restrictions. The enrichments for the rods to be shipped to TA-66 were documented in LA-UR-13-23581, but the outer diameter and length were not documented. This report provides this information.

  10. Ames test mutagenicity studies of the subfractions of the mild gasification composite material, MG-120. [Quarterly report, January--March 1992

    SciTech Connect (OSTI)

    Not Available

    1992-04-17

    Mutagenicity of six mild gasification product samples was studied using the Ames Salmonella/microsomal assay system. The results of the Ames testing of the MG-119 and MG-120 subfractions indicate significant mutagenic activity only in the nonpolar neutral fraction. The activity was evident on bacterial strains, TA98 and TA100, with and without metabolic activation for MG-120, and with metabolic activation for MG-119. Previous testing of MG-119 and MG-120 when solvated in DMSO had shown possible, but unconfirmable, mutagenic activity. Tween 80-solvated MG-119 and MG-120 showed low, but significant, mutagenic activity only on TA98 with metabolic activation. Comparison of these results indicate an inhibition of the mutagenic components by nonmutagenic components in the complex mixture. 4 refs., 2 tabs.

  11. Ames test mutagenicity studies of the subfractions of the mild gasification composite material, MG-120

    SciTech Connect (OSTI)

    Not Available

    1992-04-17

    Mutagenicity of six mild gasification product samples was studied using the Ames Salmonella/microsomal assay system. The results of the Ames testing of the MG-119 and MG-120 subfractions indicate significant mutagenic activity only in the nonpolar neutral fraction. The activity was evident on bacterial strains, TA98 and TA100, with and without metabolic activation for MG-120, and with metabolic activation for MG-119. Previous testing of MG-119 and MG-120 when solvated in DMSO had shown possible, but unconfirmable, mutagenic activity. Tween 80-solvated MG-119 and MG-120 showed low, but significant, mutagenic activity only on TA98 with metabolic activation. Comparison of these results indicate an inhibition of the mutagenic components by nonmutagenic components in the complex mixture. 4 refs., 2 tabs.

  12. EERE Success Story—Tennessee: Da Vinci Fuel-in-Oil Reduces Emissions, Wins R&D 100 Award

    Broader source: Energy.gov [DOE]

    Developed jointly by Da Vinci Emissions Services Ltd., Cummins Inc., and Oak Ridge National Laboratory (ORNL), the Da Vinci Fuel-in-Oil (DAFIO™) technology uses a fiber optic probe to obtain real-time measurements of oil in an operating engine to quantify the fuel dissolved in the lubricant oil.

  13. Biothems: Sequence stratigraphic units and their implications for regional tectono-stratigraphic interpretations

    SciTech Connect (OSTI)

    Lane, H.R. ); Frye, M.W. ); Couples, G.D. )

    1992-01-01

    Biothems are regional wedge- or lens-shaped bodies of strata that are bounded shelfward or cratonward by paleontologically recognizable unconformities; generally thicken on marine shelves, where they are typically conformable with underlying and overlying biothems; are commonly thinner or represent starved sequences further basinward; and in their most basinward extent, are either bounded by biostratigraphically recognizable unconformities or are conformable with underlying and overlying biothems. As recognized to date, biothems have a logical distribution of faunal and floral components, as well as facies groupings that represent internally consistent and logical sequences of depositional environments. A west-to-east transect within the North American Mississippian System which extends from the Basin and Range Province, across the Transcontinental Arch (TA), into the Anadarko Basin, was constructed to demonstrate the regional distribution and tectono-stratigraphic significance of biothems relative to the axis of the TA. The relationships portrayed on the transect, tied to an understanding of North American Mississippian paleogeography, imply that biothems deposited during relative highstand events on one flank of the TA are time-equivalent to biothems deposited during relative lowstand events on the opposite flank of the TA. This distribution is interpreted to have been controlled by intraplate tectonic events that formed piano key basins along the flanks of the TA. The spatial patterns of these basins are not consistent with published models of basin evolution. A further conclusion is that the lack of coincident, transgressive or regressive Mississippian biothems on either flank of the TA suggests that it is inadvisable to impose the Mississippi Valley-derived eustasy curve on western flank depositional sequences.

  14. STRESS AND FAILURE ANALYSIS OF RAPIDLY ROTATING ASTEROID (29075) 1950DA

    SciTech Connect (OSTI)

    Hirabayashi, Masatoshi; Scheeres, Daniel J.

    2015-01-01

    Rozitis et al. recently reported that near-Earth asteroid (29075) 1950DA, whose bulk density ranges from 1.0 g cm{sup 3} to 2.4g cm{sup 3}, is a rubble pile and requires a cohesive strength of at least 44-76 Pa to keep from failing due to its fast spin period. Since their technique for giving failure conditions required the averaged stress over the whole volume, it discarded information about the asteroid's failure mode and internal stress condition. This paper develops a finite element model and revisits the stress and failure analysis of 1950DA. For the modeling, we do not consider material hardening and softening. Under the assumption of an associated flow rule and uniform material distribution, we identify the deformation process of 1950DA when its constant cohesion reaches the lowest value that keeps its current shape. The results show that to avoid structural failure the internal core requires a cohesive strength of at least 75-85 Pa. It suggests that for the failure mode of this body, the internal core first fails structurally, followed by the surface region. This implies that if cohesion is constant over the whole volume, the equatorial ridge of 1950DA results from a material flow going outward along the equatorial plane in the internal core, but not from a landslide as has been hypothesized. This has additional implications for the likely density of the interior of the body.

  15. Reusable crucible for containing corrosive liquids

    DOE Patents [OSTI]

    Pruneda, J.A.H. de.

    1995-01-24

    A reusable, non-wetting, corrosion-resistant material suitable for containment of corrosive liquids is formed of a tantalum or tantalum alloy substrate that is permeated with carbon atoms. The substrate is carburized to form surface layers of TaC and Ta[sub 2]C, and then is heated at high temperature under vacuum until the carbon atoms in the carbide layers diffuse throughout the substrate to form a solid solution of carbon atoms randomly interspersed in the tantalum or tantalum alloy lattice. 10 figures.

  16. High Efficiency Recoil

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

    Efficiency Recoil Spectrometer for Superheavy Element Factory Super H eavy N uclei 2 015, C ollege S ta8on, T exas, M arch 3 1 - A pril 0 2, 2 015 G. Chubarian T exas A &M U niversity, C yclotron I ns7tute Signal / Noise Efficiency Super H eavy N uclei 2 015, C ollege S ta8on, T exas, M arch 3 1 - A pril 0 2, 2 015 Peter J . T win a nd F rancis B eck --- Eurogam P roject (late 8 0's) Signal Number of Events Energy Resolution Time Resolution Space Resolution etc. Noise Background Counts and

  17. LA-UR-15-23282

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

    5-23282 Former Technical Area 32 (TA-32) includes the site currently occupied by Smith's Marketplace and extends southward on to U.S. Department of Energy (DOE) National Nuclear Security Administration property along the south-facing slopes of Los Alamos Canyon. Between 1944 and 1953, the portion of former TA-32 now occupied by the marketplace was the site of a small research laboratory and medical research annex used for Manhattan Project- and early Cold War-era operations. These legacy

  18. Reusable crucible for containing corrosive liquids

    DOE Patents [OSTI]

    de Pruneda, Jean A. H. (Livermore, CA)

    1995-01-01

    A reusable, non-wetting, corrosion-resistant material suitable for containment of corrosive liquids is formed of a tantalum or tantalum alloy substrate that is permeated with carbon atoms. The substrate is carburized to form surface layers of TaC and Ta.sub.2 C, and then is heated at high temperature under vacuum until the carbon atoms in the carbide layers diffuse throughout the substrate to form a solid solution of carbon atoms randomly interspersed in the tantalum or tantalum alloy lattice.

  19. FL J. Smith, Jr.

    Office of Legacy Management (LM)

    ct. B. Duillap (THPJJs L. Kassel) FL J. Smith, Jr. c c Kelley from R. 1. Cook, Kslley from R. 1. Cook, J J cit cit In accordawe with Secret memorandum dated October , 1951 ta IA. E. In accordawe with Secret rwmorandnn dated October , 1951 ta IA. E. Qapletad Uranium for HAA and ML," we are Ylepletad Uranium for HAA and ML," we are obligated to fill the following orders obligated to fill the following orders North American Aviation North American Aviation . . One Inch roes One Inch roes

  20. NTSF Spring 2012 Agenda

    Office of Environmental Management (EM)

    hilTon Knoxville Knoxville, Tennessee May 15-17 naTional TransporTaTion sTaKeholders ForuM 2012 2 3 Tuesday, May 15 Regional Meetings 8:15 am - 3:30 pm Western Governors' Association (WGA) Transportation Safety Technical Advisory Group Meeting - Salon A 8:30 am - 3:15 pm Southern States Energy Board (SSEB) Radioactive Materials Transportation Committees - Salon B 9:00 am - 3:30 pm Council of State Governments (CSG Midwest) Midwestern Radioactive Materials Transportation Committee Meeting - Salon

  1. Resumption Strategy

    Office of Environmental Management (EM)

    UNCLASSIFIED | 1 Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA Treatment of Remediated Nitrate Salts (RNS) Dave Funk, Deputy Associate Director for Environmental Programs November 18, 2015 LA-UR-15-28945 | UNCLASSIFIED | 2 Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA  1979: TA-55 begins operations  A wide variety of actinide research and development is performed at the plutonium facility at TA-55 

  2. Subtask 1: Total systems analysis, assembly and testing | Center for

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

    Bio-Inspired Solar Fuel Production 1: Total systems analysis, assembly and testing All papers by year Subtask 1 Subtask 2 Subtask 3 Subtask 4 Subtask 5 Gust, D., Moore, T.A., and Moore, A.L. (2013) Artificial photosynthesis, Theoretical and Experimental Plant Physiology, 25, 182-185, http://dx.doi.org/10.1590/S2197-00252013005000002"> Sherman, B.D., Vaughn, M.D., Bergkamp, J.J., Gust, D., Moore, A.L., Moore, T.A. (2014) Evolution of reaction center mimics to systems capable of

  3. STATES GOVERI TO :H. J. He&man, Chief, Tonaw&da Sub-Of&e DATE...

    Office of Legacy Management (LM)

    STATES GOVERI TO :H. J. He&man, Chief, Tonaw&da Sub-Of&e DATE: ,i; .; .c. sgmbo1: PPS:W:mjf .. ,i. -'. i:.. :: (PPS447-53) I ..-:;..c. ' ..I-,-.. . i .,,. " :, ,, .T. ....

  4. Detection of potential genetic hazards in complex environmental mixtures using plant cytogenetics and microbial mutagenesis assays. [Arsenic-contaminated groundwater and power plant fly ash extract

    SciTech Connect (OSTI)

    Constantin, M J; Lowe, K; Rao, T K; Larimer, F W; Epler, J L

    1980-01-01

    Solid wastes have been characterized to determine their potential hazards to humans and the environment. An arsenic-contaminated ground water sample increased the frequency of histidine revertants in Salmonella typhimurium (TA-98) at 0.025 to 5.000 ..mu..l per plate with Aroclor-induced S-9 liver microsomes. When 2.5 to 75 ..mu..l of the XAD-2 concentrate (12.5-fold, v:v) were used, the mutant frequency was increased in strains TA-98, TA-100, and TA-1537; metabolic activation was not required. Only the XAD-2 concentrate was mutagenic in the Saccharomyces cerevisiae haploid strain XL-7-10B; metabolic activation was not required. The mutagenic principal, which is not known, appears to be at the limit of resolution; hence, the XAD-2 concentration is necessary to demonstrate mutagenic activity. The arsenic-contaminated ground water (0.0625 and 0.125 dilutions) and the power plant fly ash extract (undiluted) increased the frequency of bridges and fragements at anaphase in root tip cells of Hordeum. The fly ash sample was negative in the microbial assays. Results emphasize (1) the need for a battery of assays with different organisms and (2) the potential of a simple assay using plant root tip cells to detect mutagenic activity in complex environmental mixtures.

  5. Chemistry of Tantalum Clusters in Solution And on SiO(2) Supports: Analogies And Contrasts

    SciTech Connect (OSTI)

    Nemana, S.; Okamoto, N.L.; Browning, N.D.; Gates, B.C.

    2009-06-03

    Tantalum clusters have been synthesized from Ta(CH{sub 2}Ph){sub 5} on the surface of porous fumed SiO{sub 2}. When these clusters are small, incorporating, on average, several Ta atoms, their chemistry is similar to that of molecular tantalum clusters (and other early transition-metal) clusters. For example, The Ta-Ta bonds in these small supported clusters have been characterized by extended X-ray absorption fine structure (EXAFS), IR, and UV-vis spectroscopy, being similar to those in molecular analogues. The redox reactions of the supported clusters, characterized by X-ray absorption near-edge structure, are analogous to those of early transition-metal clusters in solution. In contrast to the largest of these clusters in solution and in the solid state, those supported on SiO{sub 2} are raftlike, facilitating the substantial metal-support-oxygen bonding that is evident in the EXAFS spectra. Samples consisting of tantalum clusters on SiO{sub 2} catalyze alkane disproportionation and the conversion of methane with n-butane to give other alkanes, but catalytic properties of analogous clusters in solution have barely been explored.

  6. AIB_Rad_Report_Presentation.pptx

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

    * Test r esults o f fi lters f rom e ffluent monitoring S taAon B d ownstream f rom the H EPAs, a nd a t t he d ischarge t o t he atmosphere, w ere r eported a t 9 :15 A M and i...

  7. Separation of niobium and tantalum using a chelating ion exchange resin with N-benzoyl phenyl hydroxyl amine as functional group

    SciTech Connect (OSTI)

    Pobi, M.; Das, J. )

    1993-04-01

    Niobium is separated from Ta and V by elution with 0.5 M HF in a column of chelating resin containing N-benzoyl-N-phenyl-hydroxylamine (NBPHA) as a function group. Niobium and tantalum can also be separated using their differential distribution coefficient and elution behavior, monitored by radiometric and also be spectrophotometric methods. 15 refs., 1 fig., 2 tabs.

  8. A=16Be (1977AJ02)

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

    been observed. Its atomic mass excess is calculated to be 59.22 MeV. It is then unstable with respect to breakup into 14Be + 2n by 2.4 MeV (1974TH01). See also (1973TA30, 1975BE31...

  9. 1

    Office of Environmental Management (EM)

    ATTACHMENT G.13 TECHNICAL AREA 54, AREA G, STORAGE SHED 8 INDOOR CONTAINER STORAGE UNIT CLOSURE PLAN i Attachment G.13--TA-54 Building 8 Indoor Closure Plan Los Alamos National Laboratory Hazardous Waste Permit November 2010 TABLE OF CONTENTS LIST OF TABLES ...................................................................................................................................... iv LIST OF FIGURES

  10. 1

    Office of Environmental Management (EM)

    TECHNICAL AREA 3, BUILDING 29 INDOOR CONTAINER STORAGE UNIT CLOSURE PLAN Los Alamos National Laboratory Hazardous Waste Permit November 2010 ii Attachment G.1--TA-3-29 Indoor Closure Plan TABLE OF CONTENTS LIST OF TABLES ...................................................................................................................................... iv LIST OF FIGURES

  11. 1

    Office of Environmental Management (EM)

    ATTACHMENT G.4 TECHNICAL AREA 50, BUILDING 69 INDOOR CONTAINER STORAGE UNIT CLOSURE PLAN Los Alamos National Laboratory Hazardous Waste Permit June 2012 ii Attachment G.4--TA-50-69 Indoor Closure Plan TABLE OF CONTENTS LIST OF TABLES ....................................................................................................................................... iv LIST OF FIGURES

  12. 1

    Office of Environmental Management (EM)

    ATTACHMENT G.5 TECHNICAL AREA 50, BUILDING 69 OUTDOOR CONTAINER STORAGE UNIT CLOSURE PLAN Los Alamos National Laboratory Hazardous Waste Permit June 2012 ii Attachment G.5--TA-50-69 Outdoor Closure Plan TABLE OF CONTENTS LIST OF TABLES ...................................................................................................................................... iv LIST OF FIGURES

  13. 1

    Office of Environmental Management (EM)

    3 TECHNICAL AREA 55, BUILDING 4, ROOM 401 INDOOR STORAGE TANK UNIT CLOSURE PLAN Los Alamos National Laboratory Hazardous Waste Permit November 2010 ii Attachment G.23 --TA-55 Building 4 Room 401 Indoor Closure Plan TABLE OF CONTENTS LIST OF TABLES ...................................................................................................................................... iv LIST OF FIGURES

  14. 1

    Office of Environmental Management (EM)

    4 TECHNICAL AREA 55, BUILDING 4, ROOM 401 INDOOR MIXED WASTE STABILIZATION TREATMENT UNIT CLOSURE PLAN Los Alamos National Laboratory Hazardous Waste Permit November 2010 ii Attachment G.24 --TA-55 Tank Treatment Indoor Closure Plan TABLE OF CONTENTS LIST OF TABLES ...................................................................................................................................... iv LIST OF FIGURES

  15. 1

    Office of Environmental Management (EM)

    October 2012 ATTACHMENT G.26 TECHNICAL AREA 55 OUTDOOR STORAGE PAD CLOSURE PLAN Los Alamos National Laboratory Hazardous Waste Permit October 2012 ii Attachment G.26 -- TA-55 Outdoor Pad Closure Plan TABLE OF CONTENTS LIST OF TABLES ...................................................................................................................................... iv LIST OF FIGURES

  16. I M

    Office of Legacy Management (LM)

    T h e Fallout Z o n e from th e Trinity Test a s D e te r m i n e d b y a 1 9 4 5 B e ta - ... its predecessors to characterize the fallout zone near the Trinity atomic bomb test site. ...

  17. Omega Bridge To Los Alamos "Town Site" W E S T J E M E Z R O

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

    ct ur e Research Park University House F ir e S ta ti o n 1 1 4 0 0 2 7 1 IP, SPPI GIS, September 2012 S T 2 0 5 4 LOS ALAMOS NATIONAL LABORATORY E A S T J E M E Z R O A D (...

  18. TREATMENT OF METALS PRIOR TO ELECTROPLATING

    DOE Patents [OSTI]

    Huddle, R.A.U.; Flint, O.

    1958-05-20

    The preparation of certain metal surfaces to receive electrodeposits is described. Surfaces of the metals are subjected to shot blasting by ferrous metal shot, and the surfaces then are given a coating of copper by displacement from a copper salt solution. The method applies to U, Zr, Ti, Ta, Ni, Mo, W, and V.

  19. Nuclear Data Sheets for A = 156

    SciTech Connect (OSTI)

    Reich, C.W.

    2012-11-15

    All the known nuclear-structure information on the A = 156 nuclides from {sup 156}Nd through {sup 156}Ta has been reviewed. These data are summarized and presented, together with adopted level schemes and properties based on an evaluation of them.

  20. CX-013453: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Pueblo Canyon Grade Control Structure Revitalization and Wetlands Stabilization, TA-74 CX(s) Applied: B1.3, B1.11, B1.13, B3.1, B6.1Date: 02/18/2015 Location(s): New MexicoOffices(s): Los Alamos Site Office

  1. Isonitrile radionuclide complexes for labelling and imaging agents

    DOE Patents [OSTI]

    Jones, Alun G.; Davison, Alan; Abrams, Michael J.

    1984-06-04

    A coordination complex of an isonitrile ligand and radionuclide such as Tc, Ru, Co, Pt, Fe, Os, Ir, W, Re, Cr, Mo, Mn, Ni, Rh, Pd, Nb and Ta, is useful as a diagnostic agent for labelling liposomes or vesicles, and selected living cells containing lipid membranes, such as blood clots, myocardial tissue, gall bladder tissue, etc.

  2. Special Distribution

    Office of Legacy Management (LM)

    Special Distribution Issued: December 1977 ',, Radiological Survey and Decontamination of the Former Main Technical Area (TA-1) at Los Alamos, New Mexico Compiled by A. John Ahlquist Alan K. Stoker Linda K. Trocki c laboratory of, the University of California LOS ALAMOS, NEW MEXICO 87545 An Alfirmdve Action/Equal Opportunity Employer ..-_- .-- .--.-. c T -,--... _ _._-r..l __,.. - .-,_.. ..- _._ -- .--. " . . _ . - . c- - . . . _ -. . _ . - . - . _ - - n - _ _~ ~_. __ _ ~~_ --..&e+

  3. A=14N (70AJ04)

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

    (See Energy Level Diagrams for 14N) GENERAL: See Table 14.7 Table of Energy Levels (in PDF or PS). Model calculations:(HU57D, BA59F, BR59M, OT59, SK59, PA60, TA60L, WA60, BA61D,...

  4. I

    Office of Legacy Management (LM)

    the fir+ hamrd dmn d-l- with BCZ' C. mot 4-0 b. krpti io Rind* l;.r, Fienhar,thQ plant nana@, told ua thut tha kao WOr@ taW6mWt e&W+ xmt;i P6 sot thi: pwiblo tblle rffeatar of...

  5. Nuclear Facilities and Applied Technologies at Sandia

    SciTech Connect (OSTI)

    Wheeler, Dave; Kaiser, Krista; Martin, Lonnie; Hanson, Don; Harms, Gary; Quirk, Tom

    2014-11-28

    The Nuclear Facilities and Applied Technologies organization at Sandia National Laboratories Technical Area Five (TA-V) is the leader in advancing nuclear technologies through applied radiation science and unique nuclear environments. This video describes the organizations capabilities, facilities, and culture.

  6. D. R atner,1* R. Abela,2 J. A m ann...

    Office of Scientific and Technical Information (OSTI)

    L A C -P U B -1 6 2 1 4 E x p e rim en ta l d e m o n str a tio n o f a soft x-ray self-seed ed free-electro n laser D. R atner,1* R. Abela,2 J. A m ann,1 C. Behrens,1 D. Bohler,1 ...

  7. CX-005881: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Operation of the Chloride Extraction and Acid Recovery Line at TA-55-4CX(s) Applied: B6.8Date: 05/17/2011Location(s): Los Alamos, New MexicoOffice(s): Los Alamos Site Office

  8. FFACO-DOENV--964 Rev2.indd

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

    T R O D U C T I O N T h is F e d e ra l F a c il it y A g re e m e n t a n d C o n se n t O rd e r (A g re e m e n t) is m a d e a n d e n te re d in to b y a n d a m o n g th e S ta te o f N e v a d a , a c ti n g b y a n d th ro u g h th e D e p a rt m e n t o f C o n se rv a ti o n a n d N a tu ra l R e so u rc e s, D iv is io n o f E n v ir o n m e n ta l P ro te c ti o n (N D E P ), th e U n it e d S ta te s D e p a rt m e n t o f E n e rg y (D O E ), a n d th e U n it e d S ta te s D e p a

  9. Tritium concentrations in bees and honey at Los Alamos National Laboratory: 1979-1996

    SciTech Connect (OSTI)

    Fresquez, P.R.; Armstrong, D.R.; Pratt, L.H.

    1997-01-01

    Honeybees are effective monitors of environmental pollution. The objective of this study was to summarize tritium ({sup 3}H) concentrations in bees and honey collected from within and around Los Alamos National Laboratory (LANL) over an 18-year period. Based on the long-term average, bees from nine out of eleven hives and honey from six out of eleven hives on LANL lands contained {sup 3}H that was significantly higher (p <0.05) than background. The highest average concentration of {sup 3}H in bees (435 pCi mL{sup -1}) collected over the years was from LANL`s Technical Area (TA) 54-a low-level radioactive waste disposal site (Area G). Similarly, the highest average concentration of {sup 3}H in honey (709 pCi mL{sup - 1}) was collected from a hive located near three {sup 3}H storage ponds at LANL TA-53. The average concentrations of {sup 3}H in bees and honey from background hives was 1.0 pCi mL{sup -1} and 1.5 pCi ML{sup -1}, respectively. Although the concentrations of 3H in bees and honey from most LANL and perimeter (White Rock/Pajarito Acres) areas were significantly higher than background, most areas, with the exception of TA-53 and TA-54, generally exhibited decreasing 3H concentrations over time.

  10. WASHINGTON. DC.

    Office of Legacy Management (LM)

    WASHINGTON. DC. tzr.~Dfak nuf, Ama fall- II* 8. Atoalc l%mqy Camlealnn . . . . ,L:,. ' ,. 8ta loui Are0 offlaa " . . : ' ; ,.' ~. ._ ; . . ..!"C.. ,:. . . ..~.;~..?n:,.;,, ,_ ," .L,: ' ..: ' I I. P.O. Box 36 ,, ,,,,: ,.,.:... . . Brorarw Btotlrn . St. Louis, $105cnlr1 =- %A. WO. LB - FCA Fbn. A. Dfcklooa, V?,ao huralb$

  11. A=14Be (1991AJ01)

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

    +)14B reaction (1984GI09), in the interaction of 30 MeVA 18O ions with 181Ta (1986CU01) and in the spallation of thorium by 800 MeV protons (1988WO09). See also (1986AJ01). ...

  12. (Document Number)

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

    A TA-53 TOUR FORM/RADIOLOGICAL LOG (Send completed form to MS H831) _____________ _____________________________ _________________________________ Tour Date Purpose of Tour or Tour Title Start Time and Approximate Duration ___________________________ ______________ _______________________ _________________ Tour Point of Contact/Requestor Z# (if applicable) Organization/Phone Number Signature Locations Visited: (Check all that apply, and list any others not shown. Prior approval must be obtained

  13. Environmental Monitoring and Remediation Committee Fiscal Year 2015 Work

    Office of Environmental Management (EM)

    Plan | Department of Energy 5 Work Plan Environmental Monitoring and Remediation Committee Fiscal Year 2015 Work Plan Topics: TA-54 Groundwater Surface water sediment Air Quality NMED Consent Order PDF icon EMR-FY15-WP - November 19, 2014

  14. Environmental Monitoring and Remediation Committee Fiscal Year 2016 Work

    Office of Environmental Management (EM)

    Plan | Department of Energy 6 Work Plan Environmental Monitoring and Remediation Committee Fiscal Year 2016 Work Plan Topics: Track Lifecycle Baseline Data TA-54 Groundwater Surface water sediment Air Quality NMED Consent Order PDF icon EM&R-FY16-WP - March 9, 2016

  15. A=8B (66LA04)

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

    8B (66LA04) (See Energy Level Diagrams for 8B) GENERAL: See (FO58D, TA60L, IN62, NA63E, BA64I, BA64GG, GR64C, ST64). See also Table 8.18 Table of Energy Levels (in PDF or PS)....

  16. A=6He (66LA04)

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

    66LA04) (See Energy Level Diagrams for 6He) GENERAL: See (PH60A, TA60L, AH61, BA61N, IN62, IN62B, BO63B, MO63C, VL63A, GR64C, WA64F, BO65B, LO65A). See also Table 6.1 Table of...

  17. Inertial-confinement fusion-reactor dry-wall study. Final report, 13 August 1981-31 March 1983. Report WAESD-TR-83-0010

    SciTech Connect (OSTI)

    Sucov, E.W.

    1983-04-01

    The Westinghouse ICF Dry Wall Study was undertaken (1) to explore the practical implications of using a Ta coating to protect the steel first wall of an ICF reactor against the power pulses from the explosions of a pellet containing Ta as the heavy element and (2) to determine if a feasible design for improved safety and lower cost in a blanket could be developed using solid lithium compound in place of liquid lithium as the tritium breeder. Three coating techniques were examined; plasma spray, chemical vapor deposition and explosive bonding. An evaporation code and a sputtering code which were developed at LANL, were used to calculate the loss rate of Ta due to these processes after each pellet explosion. A simulation experiment to verify the CHART D calculations was investigated. Sources of pulsed x-rays and ions to simulate the debris from each pellet explosion were identified. The CANDID code was developed to permit evaluation of candidate metals for coating the steel based on criteria such as surface and bulk temperature rise, thermal stress in the creating layer and evaporation rate. Material properties were stored in the memory and were called upon to calculate evaluation algorithms. Of twenty original candidates, six remain: Re, Ir, Mo, Cr, W, Ta and Nb. Further evaluation would include parameters such as cost, manufacturability, radioactive decay rate, etc.

  18. Ultrafast pulse radiolysis using a terawatt laser wakefield accelerator

    SciTech Connect (OSTI)

    Oulianov, Dmitri A.; Crowell, Robert A.; Gosztola, David J.; Shkrob, Ilya A.; Korovyanko, Oleg J.; Rey-de-Castro, Roberto C.

    2007-03-01

    We report ultrafast pulse radiolysis transient absorption (TA) spectroscopy measurements from the Terawatt Ultrafast High Field Facility (TUHFF) at Argonne National Laboratory. TUHFF houses a 20 TW Ti:sapphire laser system that generates 2.5 nC subpicosecond pulses of multi-mega-electron-volt electrons at 10 Hz using laser wakefield acceleration. The system has been specifically optimized for kinetic TA measurements in a pump-probe fashion. This requires averaging over many shots which necessitates stable, reliable generation of electron pulses. The latter were used to generate excess electrons in pulse radiolysis of liquid water and concentrated solutions of perchloric acid. The hydronium ions in the acidic solutions react with the hydrated electrons resulting in the rapid decay of the transient absorbance at 800 nm on the picosecond time scale. Normalization of the TA signal leads to an improvement in the signal to noise ratio by a factor of 5 to 6. Due the pointing instability of the laser this improvement was limited to a 5 to 10 min acquisition period, requiring periodic recalibration and realignment. Time resolution, defined by the rise time of TA signal from hydrated electron in pulse radiolysis of liquid water, of a few picoseconds, has been demonstrated. The current time resolution is determined primarily by the physical dimensions of the sample and the detection sensitivity. Subpicosecond time resolution can be achieved by using thinner samples, more sensitive detection techniques, and improved electron beam quality.

  19. The Effect of the Presence of 2 wt% Hafnium in T-111

    SciTech Connect (OSTI)

    Barklay, Chadwick D.; Kramer, Daniel P.; Miller, Roger G.

    2006-01-20

    Tantalum alloys have been used by the U.S. Department of Energy as structural alloys for space nuclear power systems such as Radioisotopic Thermoelectric Generators (RTG) since the 1960s. Tantalum alloys are attractive for high temperature structural applications due to their high melting point, excellent formability, good thermal conductivity, good ductility (even at low temperatures), corrosion resistance, and weldability. A number of tantalum alloys have been developed over the years to increase high-temperature strength (Ta-10%W), and reduce creep strain (T-111). These tantalum alloys have demonstrated sufficient high-temperature toughness to survive prolonged exposure to the RTG's working environment. Due to the commercial unavailability of the tantalum alloy T-111, Ta-10%W is a possible candidate replacement material because of its high melting point (3037 deg. C), high elastic modulus (207 GPa), high yield, ultimate tensile strengths at both ambient and elevated temperatures, excellent ductility, and exceptional creep properties. Ta-10%W is also attractive due its commercial availability and low cost when compared to T-111. The objective of this paper is to compare and contrast Ta-10%W and T-111 for high-temperature nuclear based power conversion applications and to document research that must be conducted to fully characterize both materials.

  20. A=8Li (1988AJ01)

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

    nuclear radius of 8Li is 2.36 0.02 fm (1985TA18) see also for derived nuclear matter, charge and neutron matter r.m.s. radii. 1. 8Li(-)8Be Qm 16.0039 The - decay is...