Sample records for namibia sb st

  1. ST

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection245C Unlimited ReleaseWelcome ton n u May 23, 200122/04 RunEnergy ST

  2. Namibia: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup |JilinLu anMicrogreenMoonNASA/AmesNS Solar05Zip CategoryNamibia: Energy

  3. LAND REFORM IN NAMIBIA: AN ANALYSIS OF MEDIA COVERAGE

    E-Print Network [OSTI]

    Engelbrecht, Petrus J.

    2014-08-31T23:59:59.000Z

    in ensuring that land reform is successfully designed and executed. The media informs the public, sets the public and political agenda, holds the government accountable, and serves as a public sphere. This project analyses Namibia's three primary daily...

  4. MARSHALL ST. E. ADAMS ST.

    E-Print Network [OSTI]

    Raina, Ramesh

    MARSHALL ST. E. ADAMS ST. IRVINGAVE. WALNUTPL. HARRISON ST. HARRISON ST. E. ADAMS ST / E.S.F. Baker Illick Moon Library Bray Walters Marshall Jahn Lab Gateway Tolley Carrier Dome Maxwell

  5. MARSHALL ST. E. ADAMS ST.

    E-Print Network [OSTI]

    Mather, Patrick T.

    MARSHALL ST. E. ADAMS ST. IRVINGAVE. WALNUTPL. HARRISON ST. HARRISON ST. E. ADAMS ST Illick Moon Library Bray Walters Marshall Jahn Lab Tolley Carrier Dome Maxwell Physics Steele Hendricks H

  6. MARSHALL ST. E. ADAMS ST.

    E-Print Network [OSTI]

    Doyle, Robert

    MARSHALL ST. E. ADAMS ST. IRVINGAVE. WALNUTPL. HARRISON ST. HARRISON ST. E. ADAMS ST Bray Walters Marshall Jahn Lab Gateway Tolley Carrier Dome Maxwell Physics Steele Hendricks H.L. H

  7. Impact of HIV/AIDS on the Agricultural Sector in Northern Namibia

    E-Print Network [OSTI]

    Carter, Charles Russell

    2011-02-22T23:59:59.000Z

    In agrarian societies, HIV/AIDS extends far beyond the realm of healthcare into agricultural production and food security as well. Namibia is a developing country with a large portion of its population involved in agriculture; the average HIV...

  8. Knowing and deciding: participation in conservation and development initiatives in Namibia and Argentina 

    E-Print Network [OSTI]

    Newsham, Andrew

    2007-01-01T23:59:59.000Z

    ’ in Namibia and the Alto Bermejo Project in Argentina. The concept of sustainability – of living in a way that meets both current and future needs – has led, on a global scale, to a re-casting of the relationship between conservation and development as one...

  9. Earth Planets Space, 52, 329336, 2000 Rock magnetism of sediments in the Angola-Namibia upwelling system

    E-Print Network [OSTI]

    Yamazaki, Toshitsugu

    Earth Planets Space, 52, 329­336, 2000 Rock magnetism of sediments in the Angola-Namibia upwelling system with special reference to loss of magnetization after core recovery Toshitsugu Yamazaki1 , Peter A Magnetism, University of Minnesota, Minneapolis, MN 55455-0128, U.S.A. 3Hawaii Institute of Geophysics

  10. Electrochemical Insertion/extraction of Lithium in Multiwall Carbon Nanotube/Sb and SnSb?.? Nanocomposites

    E-Print Network [OSTI]

    Chen, Wei Xiang

    Multiwall carbon nanotubes (CNTs) were synthesized by catalytic chemical vapor deposition of acetylene and used as templates to prepare CNT-Sb and CNT-SnSb?.? nanocomposites via the chemical reduction of SnCl? and SbCl? ...

  11. NE Pacific St. NE Pacific St.

    E-Print Network [OSTI]

    Lake W ashington Ship Canal NE Pacific St. NE Pacific St. NE Boat St. 15th Ave NE 15thAveNE UniversityWayNE BrooklynAveNE NE Pacific St. MontlakeBlvdNE MontlakeBlvdNE Pacific Place NE University Burke-Gilman Trail METRO NW A CD D EF F GHI H J RR BB CC EE AA Rotunda Cafe Ocean Sciences Hitchcock

  12. Ohmic contacts to n-GaSb

    E-Print Network [OSTI]

    Yang, Zhengchong

    1997-01-01T23:59:59.000Z

    In recent years, the Ill-V semiconductor GaSb and its ternary alloys containing antimony have exhibited interesting electrical and optical properties for device applications which include negative resistance tunnel devices, lasers, detectors and FET...

  13. Lattice-matched epitaxial GaInAsSb/GaSb thermophotovoltaic devices

    SciTech Connect (OSTI)

    Wang, C.A.; Choi, H.K.; Turner, G.W.; Spears, D.L.; Manfra, M.J. [Massachusetts Inst. of Tech., Lexington, MA (United States). Lincoln Lab.; Charache, G.W. [Lockheed Martin, Inc., Schenectady, NY (United States)

    1997-05-01T23:59:59.000Z

    The materials development of Ga{sub 1{minus}x}In{sub x}As{sub y}Sb{sub 1{minus}y} alloys for lattice-matched thermophotovoltaic (TPV) devices is reported. Epilayers with cutoff wavelength 2--2.4 {micro}m at room temperature and lattice-matched to GaSb substrates were grown by both low-pressure organometallic vapor phase epitaxy and molecular beam epitaxy. These layers exhibit high optical and structural quality. For demonstrating lattice-matched thermophotovoltaic devices, p- and n-type doping studies were performed. Several TPV device structures were investigated, with variations in the base/emitter thicknesses and the incorporation of a high bandgap GaSb or AlGaAsSb window layer. Significant improvement in the external quantum efficiency is observed for devices with an AlGaAsSb window layer compared to those without one.

  14. St. Louis Sites Fact Sheet NORTH ST. LOUIS SITES

    E-Print Network [OSTI]

    US Army Corps of Engineers

    to the Lambert-St. Louis International Airport, which is now referred to as the St. Louis Airport Site (SLAPS

  15. CAMPUSDRIVEWEST VIAORTEGASANTA TERESA ST

    E-Print Network [OSTI]

    DOIN MA ST Lagunita JUNIPERO SERRA BLVD OLM STED PANAMAST PASTEUR DR OAK RD PAGEMILLRD PORTAGEAVE BIRCH

  16. DWPF simulant CPC studies for SB8

    SciTech Connect (OSTI)

    Koopman, D. C.; Zamecnik, J. R.

    2013-06-25T23:59:59.000Z

    The Savannah River National Laboratory (SRNL) accepted a technical task request (TTR) from Waste Solidification Engineering to perform simulant tests to support the qualification of Sludge Batch 8 (SB8) and to develop the flowsheet for SB8 in the Defense Waste Processing Facility (DWPF). These efforts pertained to the DWPF Chemical Process Cell (CPC). Separate studies were conducted for frit development and glass properties (including REDOX). The SRNL CPC effort had two primary phases divided by the decision to drop Tank 12 from the SB8 constituents. This report focuses on the second phase with SB8 compositions that do not contain the Tank 12 piece. A separate report will document the initial phase of SB8 testing that included Tank 12. The second phase of SB8 studies consisted of two sets of CPC studies. The first study involved CPC testing of an SB8 simulant for Tank 51 to support the CPC demonstration of the washed Tank 51 qualification sample in the SRNL Shielded Cells facility. SB8-Tank 51 was a high iron-low aluminum waste with fairly high mercury and moderate noble metal concentrations. Tank 51 was ultimately washed to about 1.5 M sodium which is the highest wash endpoint since SB3-Tank 51. This study included three simulations of the DWPF Sludge Receipt and Adjustment Tank (SRAT) cycle and Slurry Mix Evaporator (SME) cycle with the sludge-only flowsheet at nominal DWPF processing conditions and three different acid stoichiometries. These runs produced a set of recommendations that were used to guide the successful SRNL qualification SRAT/SME demonstration with actual Tank 51 washed waste. The second study involved five SRAT/SME runs with SB8-Tank 40 simulant. Four of the runs were designed to define the acid requirements for sludge-only processing in DWPF with respect to nitrite destruction and hydrogen generation. The fifth run was an intermediate acid stoichiometry demonstration of the coupled flowsheet for SB8. These runs produced a set of processing recommendations for DWPF along with some data related to Safety Class documentation at DWPF. Some significant observations regarding SB8 follow: Reduced washing in Tank 51 led to an increase in the wt.% soluble solids of the DWPF feed. If wt.% total solids for the SRAT and SME product weren’t adjusted upward to maintain insoluble solids levels similar to past sludge batches, then the rheological properties of the slurry went below the low end of the DWPF design bases for the SRAT and SME. Much higher levels of dissolved manganese were found in the SRAT and SME products than in recent sludge batches. Closed crucible melts were more reduced than expected. The working hypothesis is that the soluble Mn is less oxidizing than assumed in the REDOX calculations. A change in the coefficient for Mn in the REDOX equation was recommended in a separate report. The DWPF (Hsu) stoichiometric acid equation was examined in detail to better evaluate how to control acid in DWPF. The existing DWPF equation can likely be improved without changing the required sample analyses through a paper study using existing data. The recommended acid stoichiometry for initial SB8 SRAT batches is 115-120% stoichiometry until some processing experience is gained. The conservative range (based on feed properties) of stoichiometric factors derived in this study was from 110-147%, but SRNL recommends using only the lower half of this range, 110-126% even after initial batches provide processing experience. The stoichiometric range for sludge-only processing appears to be suitable for coupled operation based on results from the run in the middle of the range. Catalytic hydrogen was detectable (>0.005 vol%) in all SRAT and SME cycles. Hydrogen reached 30-35% of the SRAT and SME limits at the mid-point of the stoichiometry window (bounding noble metals and acid demand).

  17. Electrical Engineering SB Rev. Nov 2013 1/3

    E-Print Network [OSTI]

    Electrical Engineering SB Rev. Nov 2013 1/3 Plan of Study for the Electrical Engineering of Study Form is for a (Circle One): DECLARATION REVISION The S.B. Program in Electrical Engineering must ­ System Programming & Machine Organization 1.00 __________ #12;Electrical Engineering SB Rev. Nov 2013

  18. Electrical Engineering SB Rev. Nov 2014 1/3

    E-Print Network [OSTI]

    Electrical Engineering SB Rev. Nov 2014 1/3 Plan of Study for the Electrical Engineering of Study Form is for a (Circle One): DECLARATION REVISION The S.B. Program in Electrical Engineering must ­ System Programming & Machine Organization 1.00 __________ Sophomore Forum #12;Electrical Engineering SB

  19. Maintaining St. Augustinegrass Lawns

    E-Print Network [OSTI]

    Chalmers, David; McAfee, James; Havlak, Roger

    2006-08-08T23:59:59.000Z

    This publication explains how to keep a St. Augustinegrass lawn healthy and attractive, with tips on mowing; fertilizing; watering; controlling weeds, insects and thatch; and eliminating compacted soil....

  20. Thermoelectric properties of ZnSb films grown by MOCVD

    SciTech Connect (OSTI)

    Venkatasubramanian, R.; Watko, E.; Colpitts, T.

    1997-07-01T23:59:59.000Z

    The thermoelectric properties of ZnSb films grown by metallorganic chemical vapor deposition (MOCVD) are reported. The growth conditions necessary to obtain stoichiometric ZnSb films and the effects of various growth parameters on the electrical conductivity and Seebeck coefficients of the films are described. The as-grown ZnSb films are p-type. It was observed that the thicker ZnSb films offer improved carrier mobilities and lower free-carrier concentration levels. The Seebeck coefficient of ZnSb films was found to rise rapidly at approximately 160 C. The thicker films, due to the lower doping levels, indicate higher Seebeck coefficients between 25 to 200 C. A short annealing of the ZnSb film at temperatures of {approximately}200 C results in reduced free-carrier level. Thermal conductivity measurements of ZnSb films using the 3-{omega} method are also presented.

  1. Recent progress in InGaAsSb/GaSb TPV devices

    SciTech Connect (OSTI)

    Shellenbarger, Z.A.; Mauk, M.G.; DiNetta, L.C. [AstroPower, Inc., Newark, DE (United States); Charache, G.W. [Lockheed Martin Corp., Schenectady, NY (United States)

    1996-05-01T23:59:59.000Z

    AstroPower is developing InGaAsSb thermophotovoltaic (TPV) devices. This photovoltaic cell is a two-layer epitaxial InGaAsSb structure formed by liquid-phase epitaxy on a GaSb substrate. The (direct) bandgap of the In{sub 1{minus}x}Ga{sub x}As{sub 1{minus}y}Sb{sub y} alloy is 0.50 to 0.55 eV, depending on its exact alloy composition (x,y); and is closely lattice-matched to the GaSb substrate. The use of the quaternary alloy, as opposed to a ternary alloy--such as, for example InGaAs/InP--permits low bandgap devices optimized for 1,000 to 1,500 C thermal sources with, at the same time, near-exact lattice matching to the GaSb substrate. Lattice matching is important since even a small degree of lattice mismatch degrades device performance and reliability and increases processing complexity. Internal quantum efficiencies as high as 95% have been measured at a wavelength of 2 microns. At 1 micron wavelengths, internal quantum efficiencies of 55% have been observed. The open-circuit voltage at currents of 0.3 A/cm{sup 2} is 0.220 volts and 0.280 V for current densities of 2 A/cm{sup 2}. Fill factors of 56% have been measured at 60 mA/cm{sup 2}. However, as current density increases there is some decrease in fill factor. The results to date show that the GaSb-based quaternary compounds provide a viable and high performance energy conversion solution for thermophotovoltaic systems operating with 1,000 to 1,500 C source temperatures.

  2. Carrier spin relaxation in GaInNAsSb/GaNAsSb/GaAs quantum well

    SciTech Connect (OSTI)

    Asami, T.; Nosho, H.; Tackeuchi, A. [Department of Applied Physics, Waseda University, Shinjuku, Tokyo 169-8555 (Japan); Li, L. H.; Harmand, J. C. [Laboratory for Photonics and Nanostructures-CNRS, Site Alcatel de Marcoussis, Route de Nozay, 91460 Marcoussis (France); Lu, S. L. [Suzhou Institute of Nano-tech and Nano-bionics, CAS, Dushu, Lake Higher Education Town, Ruoshui Road 398, Suzhou Industrial Park, Suzhou 215125 (China)

    2011-12-23T23:59:59.000Z

    We have investigated the carrier spin relaxation in GaInNAsSb/GaNAsSb/GaAs quantum well (QW) by time-resolved photoluminescence (PL) measurement. The sample consists of an 8-nm-thick GaIn{sub 0.36}N{sub 0.006}AsSb{sub 0.015} well, 5-nm-thick GaN{sub 0.01}AsSb{sub 0.11} intermediate barriers and 100-nm-thick GaAs barriers grown by molecular beam epitaxy on a GaAs(100) substrate. The spin relaxation time and recombination lifetime at 10 K are measured to be 228 ps and 151 ps, respectively. As a reference, we have also obtained a spin relaxation time of 125 ps and a recombination lifetime of 63 ps for GaInNAs/GaNAs/GaAs QW. This result shows that crystal quality is slightly improved by adding Sb, although these short carrier lifetimes mainly originate from a nonradiative recombination. These spin relaxation times are longer than the 36 ps spin relaxation time of InGaAs/InP QWs and shorter than the 2 ns spin relaxation time of GaInNAs/GaAs QW.

  3. DWPF Simulant CPC Studies For SB8

    SciTech Connect (OSTI)

    Newell, J. D.

    2013-09-25T23:59:59.000Z

    Prior to processing a Sludge Batch (SB) in the Defense Waste Processing Facility (DWPF), flowsheet studies using simulants are performed. Typically, the flowsheet studies are conducted based on projected composition(s). The results from the flowsheet testing are used to 1) guide decisions during sludge batch preparation, 2) serve as a preliminary evaluation of potential processing issues, and 3) provide a basis to support the Shielded Cells qualification runs performed at the Savannah River National Laboratory (SRNL). SB8 was initially projected to be a combination of the Tank 40 heel (Sludge Batch 7b), Tank 13, Tank 12, and the Tank 51 heel. In order to accelerate preparation of SB8, the decision was made to delay the oxalate-rich material from Tank 12 to a future sludge batch. SB8 simulant studies without Tank 12 were reported in a separate report.1 The data presented in this report will be useful when processing future sludge batches containing Tank 12. The wash endpoint target for SB8 was set at a significantly higher sodium concentration to allow acceptable glass compositions at the targeted waste loading. Four non-coupled tests were conducted using simulant representing Tank 40 at 110-146% of the Koopman Minimum Acid requirement. Hydrogen was generated during high acid stoichiometry (146% acid) SRAT testing up to 31% of the DWPF hydrogen limit. SME hydrogen generation reached 48% of of the DWPF limit for the high acid run. Two non-coupled tests were conducted using simulant representing Tank 51 at 110-146% of the Koopman Minimum Acid requirement. Hydrogen was generated during high acid stoichiometry SRAT testing up to 16% of the DWPF limit. SME hydrogen generation reached 49% of the DWPF limit for hydrogen in the SME for the high acid run. Simulant processing was successful using previously established antifoam addition strategy. Foaming during formic acid addition was not observed in any of the runs. Nitrite was destroyed in all runs and no N2O was detected during SME processing. Mercury behavior was consistent with that seen in previous SRAT runs. Mercury was stripped below the DWPF limit on 0.8 wt% for all runs. Rheology yield stress fell within or below the design basis of 1-5 Pa. The low acid Tank 40 run (106% acid stoichiometry) had the highest yield stress at 3.78 Pa.

  4. St. Bernard Project Update

    Broader source: Energy.gov [DOE]

    The folks at St. Bernard Project are helping survivors of Hurricane Katrina get back into their homes -- and are using new technologies to reduce energy and save money for the returning residents.

  5. K2CsSb Cathode Development

    SciTech Connect (OSTI)

    Smedley,J.; Rao, T.; Wang, E.

    2008-10-01T23:59:59.000Z

    K{sub 2}CsSb is an attractive photocathode for high current applications. With a quantum efficiency of >4% at 532nm and >10% at 355nm, it is the only cathode to have demonstrated an average current of 35mA in an accelerator environment We describe ongoing cathode development work. for the energy recovery linac being constructed at BNL Several cathodes have been created on both copper and stainless steel substrates, and their spatial uniformity and spectral response have been characterized. Preliminary lifetime measurements have been performed at high average current densities (>1 mA/mm{sup 2}).

  6. SB 4 Well Stimulation Treatment Regulations Text of Proposed Regulations

    E-Print Network [OSTI]

    surveys; routine activities that do not affect the integrity of the well or the formation; the removal SB 4 Well Stimulation Treatment Regulations Text of Proposed Regulations Page 1 of 13 SB 4 WELL STIMULATION TREATMENT REGULATIONS TEXT OF PROPOSED REGULATIONS Added text is shown in underline

  7. NCAI 71st Annual Convention

    Broader source: Energy.gov [DOE]

    Save the date for the National Congress of American Indians (NCAI) 71st Annual Convention at the Hyatt Regency Atlanta.

  8. Anisotropic giant magnetoresistance in NbSb?

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

    Wang, Kefeng [Brookhaven National Lab. (BNL), Upton, NY (United States); Graf, D. [Florida State Univ., Tallahassee, FL (United States); Li, Lijun [Brookhaven National Lab. (BNL), Upton, NY (United States); Wang, Limin [Brookhaven National Lab. (BNL), Upton, NY (United States); Petrovic, C. [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2014-12-05T23:59:59.000Z

    We report large transverse magnetoreistance (the magnetoresistant ratio ~ 1.3 × 10?% in 2 K and 9 T field, and 4.3 × 10?% in 0.4 K and 32 T field, without saturation) and field-induced metal semiconductor-like transition in NbSb?. Magnetoresistance is significantly suppressed but the metal-semiconductor-like transition persists when the current is along the ac-plane. The sign reversal of the Hall resistivity and Seebeck coefficient in the field, plus the electronic structure reveal the coexistence of a small number of holes with very high mobility and a large number of electrons with low mobility. The large MR is attributed to the change of the Fermi surface induced by the magnetic field in addition to the high mobility metal.

  9. Anisotropic giant magnetoresistance in NbSb?

    SciTech Connect (OSTI)

    Wang, Kefeng [Brookhaven National Lab. (BNL), Upton, NY (United States); Graf, D. [Florida State Univ., Tallahassee, FL (United States); Li, Lijun [Brookhaven National Lab. (BNL), Upton, NY (United States); Wang, Limin [Brookhaven National Lab. (BNL), Upton, NY (United States); Petrovic, C. [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2014-12-05T23:59:59.000Z

    We report large transverse magnetoreistance (the magnetoresistant ratio ~ 1.3 × 10?% in 2 K and 9 T field, and 4.3 × 10?% in 0.4 K and 32 T field, without saturation) and field-induced metal semiconductor-like transition in NbSb?. Magnetoresistance is significantly suppressed but the metal-semiconductor-like transition persists when the current is along the ac-plane. The sign reversal of the Hall resistivity and Seebeck coefficient in the field, plus the electronic structure reveal the coexistence of a small number of holes with very high mobility and a large number of electrons with low mobility. The large MR is attributed to the change of the Fermi surface induced by the magnetic field in addition to the high mobility metal.

  10. Anisotropic giant magnetoresistance in NbSb?

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

    Wang, Kefeng; Graf, D.; Li, Lijun; Wang, Limin; Petrovic, C.

    2014-12-05T23:59:59.000Z

    We report large transverse magnetoreistance (the magnetoresistant ratio ~ 1.3 × 10?% in 2 K and 9 T field, and 4.3 × 10?% in 0.4 K and 32 T field, without saturation) and field-induced metal semiconductor-like transition in NbSb?. Magnetoresistance is significantly suppressed but the metal-semiconductor-like transition persists when the current is along the ac-plane. The sign reversal of the Hall resistivity and Seebeck coefficient in the field, plus the electronic structure reveal the coexistence of a small number of holes with very high mobility and a large number of electrons with low mobility. The large MR is attributed tomore »the change of the Fermi surface induced by the magnetic field in addition to the high mobility metal.« less

  11. Point defect balance in epitaxial GaSb

    SciTech Connect (OSTI)

    Segercrantz, N., E-mail: natalie.segercrantz@aalto.fi; Slotte, J.; Makkonen, I.; Kujala, J.; Tuomisto, F. [Department of Applied Physics, Aalto University, P.O. Box 14100, FIN-00076 Aalto Espoo (Finland); Song, Y.; Wang, S. [Department of Microtechnology and Nanoscience, Chalmers University of Technology, 41296 Göteborg (Sweden); State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences 865 Changning Road, Shanghai 200050 (China)

    2014-08-25T23:59:59.000Z

    Positron annihilation spectroscopy in both conventional and coincidence Doppler broadening mode is used for studying the effect of growth conditions on the point defect balance in GaSb:Bi epitaxial layers grown by molecular beam epitaxy. Positron annihilation characteristics in GaSb are also calculated using density functional theory and compared to experimental results. We conclude that while the main positron trapping defect in bulk samples is the Ga antisite, the Ga vacancy is the most prominent trap in the samples grown by molecular beam epitaxy. The results suggest that the p–type conductivity is caused by different defects in GaSb grown with different methods.

  12. Electronic-Structure of the Semimetals Bi and Sb

    E-Print Network [OSTI]

    LIU, Y.; Allen, Roland E.

    1995-01-01T23:59:59.000Z

    characteris- tic length, which makes Sb and Bi ideal for studying and employing quantum confinement effects. The three above semimetal-semiconductor superlattices are all grown in the [111] direction, along which the electron efFective masses of Bi and Sb... are relatively small and the quantum confinement length (scaling as m' ') consequently large. Also, there is only a small lattice mismatch in each case between the (111) planes of semimetal and semiconduc- tor. ' These three systems are, therefore...

  13. GaInAsSb/A1GaAsSb/Sb Thermophotovoltaic Devices With an Internal Back-Surface Reflector Formed by Wafer Bonding

    SciTech Connect (OSTI)

    C.A. Wang; R.K. Huang; D.A. Shiau; M.K. Connors; P.G. Murphy; P.W. O'brien; A.C. Anderson; D.M. DePoy; G. Nichols; M.N. Palmasiano

    2002-12-18T23:59:59.000Z

    A novel implementation for GAInAsSb/AlGaAsSb/GaSb TPV cells with an internal back-surface reflector (BSR) formed by wafer bonding to GaAs is demonstrated. The SiO{sub x}/Ti/Au internal BSR enhances optical absorption within the device, while the dielectric layer provides electrical isolation. This configuration has the potential to improve TPV device performance; is compatible with monolithic series-interconnection of TPV cells for building voltage; and can mitigate the requirements of filters used for front-surface spectral control. At a short-circuit density of 0.4 A/cm{sup 2}, the open-circuit voltage of a single TPV cell is 0.2 V, compared to 0.37 and 1.8 V for 2- and 10-junction series-interconnected TPV cells, respectively.

  14. Lattice Thermal conductivity of the Cu3SbSe4-Cu3SbS4 Solid Solution

    SciTech Connect (OSTI)

    Skoug, Eric [Michigan State University, East Lansing; Cain, Jeffrey D. [Michigan State University, East Lansing; Morelli, Donald [Michigan State University, East Lansing; Kirkham, Melanie J [ORNL; Majsztrik, Paul W [ORNL; Lara-Curzio, Edgar [ORNL

    2011-01-01T23:59:59.000Z

    The compositional dependence of the crystal structure and lattice thermal conductivity in the Cu3SbSe4-Cu3SbS4 system has been studied. The lattice parameters of the Cu3SbSe4-xSx compounds decrease linearly with x, and the tetragonal structure (space group no. 121) of the end compounds is maintained at all compositions. The thermal conductivity is much lower than that predicted by a simple rule of mixtures, which is typical for a solid solution. The Debye model produces a very reasonable fit to the experimental lattice thermal conductivity data when phonon scattering due to atomic mass and size differences between Se and S is taken into account. Compounds in this series are likely to improve upon the thermoelectric performance of Cu3SbSe4, which has shown ZT=0.72 when optimized.

  15. The antimony-group 11 chemical bond: Dissociation energies of the diatomic molecules CuSb, AgSb, and AuSb

    SciTech Connect (OSTI)

    Carta, V.; Ciccioli, A., E-mail: guido.gigli@uniroma1.it, E-mail: andrea.ciccioli@uniroma1.it; Gigli, G., E-mail: guido.gigli@uniroma1.it, E-mail: andrea.ciccioli@uniroma1.it [Dipartimento di Chimica, Sapienza Università di Roma, p.le A. Moro 5, 00185 Roma (Italy)

    2014-02-14T23:59:59.000Z

    The intermetallic molecules CuSb, AgSb, and AuSb were identified in the effusive molecular beam produced at high temperature under equilibrium conditions in a double-cell-like Knudsen source. Several gaseous equilibria involving these species were studied by mass spectrometry as a function of temperature in the overall range 1349–1822 K, and the strength of the chemical bond formed between antimony and the group 11 metals was for the first time measured deriving the following thermochemical dissociation energies (D{sub 0}{sup ?}, kJ/mol): 186.7 ± 5.1 (CuSb), 156.3 ± 4.9 (AgSb), 241.3 ± 5.8 (AuSb). The three species were also investigated computationally at the coupled cluster level with single, double, and noniterative quasiperturbative triple excitations (CCSD(T)). The spectroscopic parameters were calculated from the potential energy curves and the dissociation energies were evaluated at the Complete Basis Set limit, resulting in an overall good agreement with experimental values. An approximate evaluation of the spin-orbit effect was also performed. CCSD(T) calculations were further extended to the corresponding group 11 arsenide species which are here studied for the first time and the following dissociation energies (D{sub 0}{sup ?}, kJ/mol): 190 ± 10 (CuAs), 151 ± 10 (AgAs), 240 ± 15 (AuAs) are proposed. Taking advantage of the new experimental and computational information here presented, the bond energy trends along group 11 and 4th and 5th periods of the periodic table were analyzed and the bond energies of the diatomic species CuBi and AuBi, yet experimentally unobserved, were predicted on an empirical basis.

  16. No. 16 ISSN 10278389 March 2012 The Southern African Large Telescope (Courtesy: S.B. Potter)

    E-Print Network [OSTI]

    Jarrett, Thomas H.

    @aol.com P.M. Okouma Gabon okouma@hotmail.com A.I. Ibrahim Egypt alaa@milkyway.gsfc.nasa.gov L. Kebede-East and Africa. In partic- ular, the completion of HESS (the High Energy Stereoscopic System, in Namibia-class observational capability from ultra-high energy gamma-rays, through optical/near-IR to radio wave- lengths

  17. Set the PACE St. Louis

    Broader source: Energy.gov [DOE]

    Commercial property owners, community associations (e.g., Home Owners Associations), and some residential property owners are eligible for Set the PACE St. Louis. Currently, only residential prop...

  18. Florida Nuclear Profile - St Lucie

    U.S. Energy Information Administration (EIA) Indexed Site

    St Lucie" "Unit","Summer capacity (mw)","Net generation (thousand mwh)","Summer capacity factor (percent)","Type","Commercial operation date","License expiration date"...

  19. Interface effect of InSb quantum dots embedded in SiO{sub 2} matrix

    SciTech Connect (OSTI)

    Chen Dongliang; Fan Jiangwei; Wei Shiqiang [National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029 (China); Li Chaosheng; Zhu Zhengang [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, PO Box 1129, Hefei 230031 (China)

    2005-08-15T23:59:59.000Z

    The interface effect of InSb quantum dots (QDs) embedded in SiO{sub 2} matrix has been investigated by Raman scattering spectroscopy, x-ray diffraction (XRD), and x-ray absorption fine structure (both of EXAFS and XANES). The EXAFS and XRD results show clearly that the bond length of the Sb-In first shell of the InSb QDs contracts slightly about 0.02 A compared with that of the bulk InSb. The Raman scattering spectrum of the InSb QDs reveals that the lattice contraction partly weakens the phonon confinement effect. The coordination geometry at the interface of the InSb QDs is mainly Sb (In)-O covalent bridge bonds. The Sb K-XANES calculations of InSb QDs embedded in SiO{sub 2} matrix based on FEFF8 indicate that the intensity increase and the broadening of the white line peak of Sb atoms are essentially attributed to both the increase of Sb p-hole population and the change of Sb intra-atomic potential {mu}{sub 0}(E) affected by the SiO{sub 2} matrix. Our results show that the interface effect between the InSb QDs and the SiO{sub 2} matrix leads not only to the slight lattice contraction of InSb QDs and the large structural distortion in the interface area of InSb QDs, but also to the significant change of the Sb intra-atomic potential and the obvious charge redistribution around Sb atoms.

  20. Effect of Sb on the Properties of GaInP Top Cells (Presentation)

    SciTech Connect (OSTI)

    Olson, J. M.; McMahon, W. E.; Kurtz, S.

    2006-05-01T23:59:59.000Z

    The summary of this report is that: (1) Sb can be used to increase V{sub oc} of a GaInP top cell; (2) the photovoltaic quality of GaInP is relatively unaffected by the presence of Sb; and (3) Sb-doped GaInP/GaAs tandem cells show promise for achieving efficiencies over 32%.

  1. St John Ambulance Australia Research Scholarships St John Ambulance Australia ("St John") is Australia's leading provider of first aid training,

    E-Print Network [OSTI]

    of first aid kits and equipment. St John runs the ambulance services in Western Australia and the NorthernSt John Ambulance Australia Research Scholarships St John Ambulance Australia ("St John") is Australia's leading provider of first aid training, first aid services at public events and supplier

  2. StORe Business Analysis 

    E-Print Network [OSTI]

    Miller, Ken

    2006-12-15T23:59:59.000Z

    The StORe project is multidisciplinary in scope, embracing the seven scientific domains of archaeology, astronomy, biochemistry, biosciences, chemistry, physics and the social sciences (originally described in the project ...

  3. Quaternary InGaAsSb Thermophotovoltaic Diodes

    SciTech Connect (OSTI)

    MW Dashiell; JF Beausang; H Ehsani; GJ Nichols; DM Depoy; LR Danielson; P Talamo; KD Rahner; EJ Brown; SR Burger; PM Foruspring; WF Topper; PF Baldasaro; CA Wang; R Huang; M Connors; G Turner; Z Shellenbarger; G Taylor; J Li; R Martinelli; D Donetski; S Anikeev; G Belenky; S Luryi

    2006-03-09T23:59:59.000Z

    In{sub x}Ga{sub 1-x}As{sub y}Sb{sub 1-y} thermophotovoltaic (TPV) diodes were grown lattice-matched to GaSb substrates by Metal Organic Vapor Phase Epitaxy (MOVPE) in the bandgap range of E{sub G} = 0.5 to 0.6eV. InGaAsSb TPV diodes, utilizing front-surface spectral control filters, are measured with thermal-to-electric conversion efficiency and power density of {eta}{sub TPV} = 19.7% and PD =0.58 W/cm{sup 2} respectively for a radiator temperature of T{sub radiator} = 950 C, diode temperature of T{sub diode} = 27 C, and diode bandgap of E{sub G} = 0.53eV. Practical limits to TPV energy conversion efficiency are established using measured recombination coefficients and optical properties of front surface spectral control filters, which for 0.53eV InGaAsSb TPV energy conversion is {eta}{sub TPV} = 28% and PD = 0.85W/cm{sup 2} at the above operating temperatures. The most severe performance limits are imposed by (1) diode open-circuit voltage (VOC) limits due to intrinsic Auger recombination and (2) parasitic photon absorption in the inactive regions of the module. Experimentally, the diode V{sub OC} is 15% below the practical limit imposed by intrinsic Auger recombination processes. Analysis of InGaAsSb diode electrical performance vs. diode architecture indicate that the V{sub OC} and thus efficiency is limited by extrinsic recombination processes such as through bulk defects.

  4. Hydrogen passivation of Se and Te in AlSb M. D. McCluskey and E. E. Haller

    E-Print Network [OSTI]

    McCluskey, Matthew

    Hydrogen passivation of Se and Te in AlSb M. D. McCluskey and E. E. Haller Lawrence Berkeley observed local vibrational modes LVM's arising from DX-hydrogen complex in AlSb. Hydrogen was diffused into bulk AlSb:Se and AlSb:Te by annealing in sealed quartz ampoules with either hydrogen gas or methanol CH

  5. InAs/InAsSb strain balanced superlattices for optical detectors: Material properties and energy band simulations

    E-Print Network [OSTI]

    Krishna, Sanjay

    InAs/InAsSb strain balanced superlattices for optical detectors: Material properties and energyAs/InAsSb strain balanced superlattices for optical detectors: Material properties and energy band simulations D February 2012) InAsSb/InAs type II strain balanced superlattices lattice matched to GaSb have recently been

  6. Friends of St Andrews University Library

    E-Print Network [OSTI]

    Brierley, Andrew

    Friends of St Andrews University Library www.st-andrews.ac.uk/library/friends Designed and printed Andrews Library Special Collections Department. The University of St Andrews is a charity registered in Scotland : No SC013532 #12;The Friends of St Andrews University Library was founded in 2007 with the aim of

  7. Influence of substituting Sn for Sb on the thermoelectric transport properties of CoSb{sub 3}-based skutterudites

    SciTech Connect (OSTI)

    Hui, Si [Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States); Nielsen, Michele D. [Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, Ohio 43210 (United States); Homer, Mark R.; Medlin, Douglas L. [Sandia National Laboratories, Livermore, California 94550 (United States); Tobola, Janusz [AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, 30-059 Krakow (Poland); Salvador, James R. [Chemical and Materials Systems Laboratory, GM R and D Center, Warren, Michigan 48090 (United States); Heremans, Joseph P. [Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, Ohio 43210 (United States); Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States); Pipe, Kevin P. [Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States); Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109 (United States); Uher, Ctirad [Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)

    2014-03-14T23:59:59.000Z

    Band structure calculations that incorporate impurity effects suggest that a band resonant state may be formed in p-type CoSb{sub 3}-based skutterudites by replacing Sb atoms with Sn dopant atoms. Such resonant states have the potential to greatly improve thermoelectric energy conversion efficiency by increasing the density of states variation near the Fermi level, thereby increasing the Seebeck coefficient at a given carrier concentration. Through transport measurements of the Seebeck coefficient, electrical conductivity, thermal conductivity, and Hall coefficient, we show that a practical band resonant state is not achieved by Sn doping. Compared to undoped CoSb{sub 3}, the dimensionless figure of merit (ZT) in Sn-doped CoSb{sub 3} is enhanced slightly at high temperatures to a value of 0.2, mostly due to a reduction in thermal conductivity. The Fermi level is calculated not to reach the band resonant state induced by Sn impurity atoms within the range of Sn concentrations examined here.

  8. Thermal Processing Effects on Microstructure and Composition of Cu3SbSe3

    SciTech Connect (OSTI)

    Majsztrik, Paul W [ORNL; Kirkham, Melanie J [ORNL; Garcia Negron, Valerie [Polytechnic University of Puerto Rico (PUPR); Lara-Curzio, Edgar [ORNL; Skoug, Eric [Michigan State University, East Lansing; Morelli, Donald [Michigan State University, East Lansing

    2013-01-01T23:59:59.000Z

    We report on the effects of thermal processing on the microstructure and composition of a system with overall stoichiometry of 3Cu:1Sb:3Se with the aim of producing single-phase Cu3SbSe3. It was found that slowly cooling from the melt produced a multiphase material consisting of Cu2Se and CuSbSe2, but devoid of Cu3SbSe3. Cooling rapidly from the melt resulted in three-phase microstructures consisting of Cu2Se, CuSbSe2, and Cu3SbSe3. Subsequent annealing of the three-phase material between 325 C and 400 C shifted composition towards nearly pure Cu3SbSe3, the target compound of this work. The kinetics of the transformation into Cu3SbSe3 is successfully described using a modified Avrami model, which suggests that diffusion is the rate-controlling step. Values of Young s modulus and hardness, obtained by nanoindentation, are reported for Cu2Se, CuSbSe2, and Cu3SbSe3.

  9. GaSb substrates with extended IR wavelength for advanced space based applications

    SciTech Connect (OSTI)

    Allen, Lisa P.; Flint, Patrick; Dallas, Gordon; Bakken, Daniel; Blanchat, Kevin; Brown, Gail J.; Vangala, Shivashankar R.; Goodhue, William D.; Krishnaswami, Kannan

    2009-05-01T23:59:59.000Z

    GaSb substrates have advantages that make them attractive for implementation of a wide range of infrared (IR) detectors with higher operating temperatures for stealth and space based applications. A significant aspect that would enable widespread commercial application of GaSb wafers for very long wavelength IR (VLWIR) applications is the capability for transmissivity beyond 15 m. Due largely to the GaSb (antisite) defect and other point defects in undoped GaSb substrates, intrinsic GaSb is still slightly p-type and strongly absorbs in the VLWIR. This requires backside thinning of the GaSb substrate for IR transmissivity. An extremely low n-type GaSb substrate is preferred to eliminate thinning and provide a substrate solution for backside illuminated VLWIR devices. By providing a more homogeneous radial distribution of the melt solute to suppress GaSb formation and controlling the cooling rate, ultra low doped n:GaSb has been achieved. This study examines the surface properties and IR transmission spectra of ultra low doped GaSb substrates at both room and low temperatures. Atomic force microscopy (AFM), homoepitaxy by MBE, and infrared Fourier transform (FTIR) analysis was implemented to examine material quality. As compared with standard low doped GaSb, the ultra low doped substrates show over 50% transmission and consistent wavelength transparency past 23 m with improved %T at low temperature. Homoepitaxy and AFM results indicate the ultra low doped GaSb has a low thermal desorbtion character and qualified morphology. In summary, improvements in room temperature IR transmission and extended wavelength characteristics have been shown consistently for ultra low doped n:GaSb substrates.

  10. Structural transition and amorphization in compressed ? - Sb 2 O 3

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

    Zhao, Zhao; Zeng, Qiaoshi; Zhang, Haijun; Wang, Shibing; Hirai, Shigeto; Zeng, Zhidan; Mao, Wendy L.

    2015-05-01T23:59:59.000Z

    Sb?O?-based materials are of broad interest in materials science and industry. High-pressure study using diamond anvil cells shows promise in obtaining new crystal and electronic structures different from their pristine states. Here, we conducted in situ angle dispersive synchrotron x-ray-diffraction and Raman spectroscopy experiments on ?-Sb?O? up to 50 GPa with neon as the pressure transmitting medium. A first-order structural transition was observed in between 15 and 20 GPa, where the cubic phase I gradually transformed into a layered tetragonal phase II through structural distortion and symmetry breaking. To explain the dramatic changes in sample color and transparency, we performed first-principles calculations to track the evolution of its density of states and electronic structure under pressure. At higher pressure, a sluggish amorphization was observed. Our results highlight the structural connections among the sesquioxides, where the lone electron pair plays an important role in determining the local structures.

  11. Comparative analysis of hole transport in compressively strained InSb and Ge quantum well heterostructures

    SciTech Connect (OSTI)

    Agrawal, Ashish; Barth, Michael; Madan, Himanshu; Datta, Suman [Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Lee, Yi-Jing; Lin, You-Ru; Wu, Cheng-Hsien; Ko, Chih-Hsin; Wann, Clement H. [Taiwan Semiconductor Manufacturing Company, Hsinchu 30078, Taiwan (China); Loubychev, Dmitri; Liu, Amy; Fastenau, Joel [IQE, Inc., Bethlehem, Pennsylvania 18015 (United States); Lindemuth, Jeff [Lake Shore Cryotronics, Westerville, Ohio 43082 (United States)

    2014-08-04T23:59:59.000Z

    Compressively strained InSb (s-InSb) and Ge (s-Ge) quantum well heterostructures are experimentally studied, with emphasis on understanding and comparing hole transport in these two-dimensional confined heterostructures. Magnetotransport measurements and bandstructure calculations indicate 2.5× lower effective mass for s-InSb compared to s-Ge quantum well at 1.9?×?10{sup 12}?cm{sup –2}. Advantage of strain-induced m* reduction is negated by higher phonon scattering, degrading hole transport at room temperature in s-InSb quantum well compared to s-Ge heterostructure. Consequently, effective injection velocity is superior in s-Ge compared to s-InSb. These results suggest s-Ge quantum well heterostructure is more favorable and promising p-channel candidate compared to s-InSb for future technology node.

  12. Photoemission study of the electronic structure and charge density waves of Na?Ti?Sb?O

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

    Tan, S. Y.; Jiang, J.; Ye, Z. R.; Niu, X. H.; Song, Y.; Zhang, C. L.; Dai, P. C.; Xie, B. P.; Lai, X. C.; Feng, D. L.

    2015-04-30T23:59:59.000Z

    The electronic structure of Na?Ti?Sb?O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The obtained band structure and Fermi surface agree well with the band structure calculation of Na?Ti?Sb?O in the non-magnetic state, which indicates that there is no magnetic order in Na?Ti?Sb?O and the electronic correlation is weak. Polarization dependent ARPES results suggest the multi-band and multi-orbital nature of Na?Ti?Sb?O. Photon energy dependent ARPES results suggest that the electronic structure of Na?Ti?Sb?O is rather two-dimensional. Moreover, we find a density wave energy gap forms below the transition temperature and reaches 65 meV atmore »7 K, indicating that Na?Ti?Sb?O is likely a weakly correlated CDW material in the strong electron-phonon interaction regime. (author)« less

  13. New Antimony Lanthanide Disulfide Dibromides LnSbS

    SciTech Connect (OSTI)

    Gout, D.; Jobic, S.; Evain, M.; Brec, R.

    2001-05-01T23:59:59.000Z

    CeSbS{sub 2}Br{sub 2} (I), Ce{sub 1/2}La{sub 1/2}SbS{sub 2}Br{sub 2} (II), and LaSbS{sub 2}Br{sub 2} (III) have been synthesized at 700 C from a mixture of LnBr{sub 3}, Ln{sub 2}S{sub 3}, Sb, and S and characterized by single-crystal X-ray diffraction. The three phases are isostructural (space group P2{sub 1}/c, Z=4) and crystallize in a novel, dense, bidimensional structure with cell parameters a=8.709(3) {angstrom}, b=9.187(2) {angstrom}, c=17.397(5) {angstrom} {beta}=104.26(3) for I, a=8.739(7) {angstrom}, b=9.219(7) {angstrom}, c=17.41(2) {angstrom}, =104.3(1) for II, and a=8.785(1) {angstrom}, b=9.236(2) {angstrom}, c=17.372(3) {angstrom}, {beta}=104.09(2) for III. In these compounds, [Ln S{sub 5}Br{sub 4}] and [Ln S{sub 3}Br{sub 6}] (Ln=Ce, La) distorted tricapped trigonal prisms define infinite {sub {infinity}}{sup 2}[LnS{sub 2}Br{sub 2}] layers counterbalanced and capped by antimony cations. In good accordance with the structural features, the charge balance in these materials is to be written Ln{sup III}Sb{sup III}S{sup -II}{sub 2}Br{sup -I}{sub 2}. These compounds exhibit a yellow hue with a measured absorption threshold of 2.42(1), 2.55(1), and 2.72(1) eV for I, II, and III, respectively. In the two cerium containing bromothioantimonates I and II, the origin of the color is assigned to a Ce-4f{yields}Ce-5d electronic transition, which shifts to higher energy from I to II due either to a matrix effect (increase of the mean Ln-S distances under the substitution of Ce for La) or to an atomic ordering between Ce and La cations on the Ln(1) and Ln(2) crystallographic sites. In contrast, the electronic transition at play in III involves a charge transfer from the bromine and sulfur ions to the antimony ions, the latter contributing substantially to the lowermost levels of the conduction band.

  14. ST. ANNE'S COLLEGE Environmental Policy

    E-Print Network [OSTI]

    ST. ANNE'S COLLEGE Environmental Policy Travel We are committed to sustainable travel, to encourage habitats in urban environments owned by, or related to, College, and reduce our environmental impacts, to purchase electricity from `green' sources. In addition to our existing solar hot water schemes, we

  15. ST. LOUIS AIRPORT/ HAZELWOOD INTERIM

    E-Print Network [OSTI]

    and remote disposal of contaminated soils on various private properties, under removal action authority the Airport resulted in the contamination of numerous private and municipally owned properties. The St. Louis radioactively-contaminated sites are part of the Formerly Utilized Sites Remedial Action Program (FUSRAP

  16. Cu2Sb thin film electrodes prepared by pulsed laser deposition f or lithium batteries

    E-Print Network [OSTI]

    Song, Seung-Wan; Reade, Ronald P.; Cairns, Elton J.; Vaughey, Jack T.; Thackeray, Michael M.; Striebel, Kathryn A.

    2003-01-01T23:59:59.000Z

    The Electrochemical Society (Batteries and Energy ConversionDeposition for Lithium Batteries Seung-Wan Song, a, * Ronaldrechargeable lithium batteries. Introduction Sb-containing

  17. Page 1 MATH 262 Quiz 1 Name.- Sb 0“ PID: Sokve the problem ...

    E-Print Network [OSTI]

    MATH 262 Quiz 1. Name.- Sb 0“ PID: Sokve the problem systematicaìly and neatly und show aìl your work. (4pts) l. Find the equation of the orthogonal ...

  18. Cu2Sb thin film electrodes prepared by pulsed laser deposition f or lithium batteries

    E-Print Network [OSTI]

    Song, Seung-Wan; Reade, Ronald P.; Cairns, Elton J.; Vaughey, Jack T.; Thackeray, Michael M.; Striebel, Kathryn A.

    2003-01-01T23:59:59.000Z

    Laser Deposition for Lithium Batteries Seung-Wan Song, a, *in rechargeable lithium batteries. Introduction Sb-in rechargeable lithium batteries. Two advantages of

  19. NORTH ST. LOUIS COUNTY SITES ANNUAL ENVIRONMENTAL

    E-Print Network [OSTI]

    US Army Corps of Engineers

    Airport Site and St. Louis Airport Site Vicinity Properties CY 2010 Remedial Actions.3.1 Latty Avenue Properties CY 2010 Remedial Actions...................................1-3 1.3.2 St. Louis

  20. NORTH ST. LOUIS COUNTY SITES ANNUAL ENVIRONMENTAL

    E-Print Network [OSTI]

    US Army Corps of Engineers

    Airport Site and St. Louis Airport Site Vicinity Properties CY 2012 Remedial Actions.3.1 Latty Avenue Properties CY 2012 Remedial Actions...................................1-3 1.3.2 St. Louis

  1. High-temperature luminescence in an n-GaSb/n-InGaAsSb/p-AlGaAsSb light-emitting heterostructure with a high potential barrier

    SciTech Connect (OSTI)

    Petukhov, A. A., E-mail: andrey-rus29@rambler.ru; Zhurtanov, B. E.; Kalinina, K. V.; Stoyanov, N. D.; Salikhov, H. M.; Mikhailova, M. P.; Yakovlev, Yu. P. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

    2013-09-15T23:59:59.000Z

    The electroluminescent properties of an n-GaSb/n-InGaAsSb/p-AlGaAsSb heterostructure with a high potential barrier in the conduction band (large conduction-band offset) at the n-GaSb/n-InGaAsSb type-II heterointerface ({Delta}E{sub c} = 0.79 eV) are studied. Two bands with peaks at 0.28 and 0.64 eV at 300 K, associated with radiative recombination in n-InGaAsSb and n-GaSb, respectively, are observed in the electroluminescence (EL) spectrum. In the entire temperature range under study, T = 290-480 K, additional electron-hole pairs are formed in the n-InGaAsSb active region by impact ionization with hot electrons heated as a result of the conduction-band offset. These pairs contribute to radiative recombination, which leads to a nonlinear increase in the EL intensity and output optical power with increasing pump current. A superlinear increase in the emission power of the long-wavelength band is observed upon heating in the temperature range T = 290-345 K, and a linear increase is observed at T > 345 K. This work for the first time reports an increase in the emission power of a light-emitting diode structure with increasing temperature. It is shown that this rise is caused by a decrease in the threshold energy of the impact ionization due to narrowing of the band gap of the active region.

  2. Direct imaging of InSb (110)-(1x1) surface grown by molecular beam epitaxy

    SciTech Connect (OSTI)

    Mishima, T. D. [Homer L. Dodge Department of Physics and Astronomy, and Center for Semiconductor Physics in Nanostructures, University of Oklahoma, Norman, Oklahoma 73019 (United States)

    2011-10-01T23:59:59.000Z

    High-resolution transmission electron microscopy under a profile imaging condition (HR-profile TEM) was employed to determine the structural model for the InSb(110)-(1x1) relaxation surface grown by molecular beam epitaxy (MBE). HR-profile TEM analyses indicate that the chevron model, which is widely accepted for zinc-blende-type III-V(110)-(1x1) surfaces prepared by cleavage, is also applicable to the InSb(110)-(1x1) surface prepared under an Sb-rich MBE condition. The assignment of atomic species (In or Sb) of InSb(110)-(1x1) surfaces was confirmed based on a HR-profile TEM image that captures the connected facets of InSb(110)-(1x1) and InSb(111)B-(2x2). On the basis of the well-known atomic species of InSb(111)B-(2x2), the atomic species of the InSb(110)-(1x1) surface were deduced straightforwardly: the atoms shifted upward and downward at the topmost layer of the InSb(110)-(1x1) surface are Sb and In, respectively. The atomic arrangements of the InSb(110)-(1x1)-InSb(111)B-(2x2) facet determined by HR-profile TEM may represent the atomic arrangements of zinc-blende-type III-V(331)B surfaces.

  3. Summary of Activities at the ST LOUIS NORTH COUNTY SITE

    E-Print Network [OSTI]

    US Army Corps of Engineers

    -St. Louis International Airport, which is now referred to as the St. Louis Airport Site (SLAPS). In 1966

  4. 1. Williams Shop 15 Spring St., 413-458-3605

    E-Print Network [OSTI]

    Aalberts, Daniel P.

    Spring St., 413-458-8321 8. Nature's Closet 61 Spring St., 413-458-7909 9. Sweets and Beans Confieserie & Vines Beer Garden & Brasserie 16 Water St., 413-884-1372 31. Amy's Cottage 24 Water St., 413-458-4305 32. Water Street Books 26 Water St., 413-458-8072 33. In Touch Massage & Day Spa 84 Water St., 413

  5. Key results from SB8 simulant flowsheet studies

    SciTech Connect (OSTI)

    Koopman, D. C.

    2013-04-26T23:59:59.000Z

    Key technically reviewed results are presented here in support of the Defense Waste Processing Facility (DWPF) acceptance of Sludge Batch 8 (SB8). This report summarizes results from simulant flowsheet studies of the DWPF Chemical Process Cell (CPC). Results include: Hydrogen generation rate for the Sludge Receipt and Adjustment Tank (SRAT) and Slurry Mix Evaporator (SME) cycles of the CPC on a 6,000 gallon basis; Volume percent of nitrous oxide, N2O, produced during the SRAT cycle; Ammonium ion concentrations recovered from the SRAT and SME off-gas; and, Dried weight percent solids (insoluble, soluble, and total) measurements and density.

  6. Tank 40 Final SB7b Chemical Characterization Results

    SciTech Connect (OSTI)

    Bannochie, C. J.

    2012-11-06T23:59:59.000Z

    A sample of Sludge Batch 7b (SB7b) was taken from Tank 40 in order to obtain radionuclide inventory analyses necessary for compliance with the Waste Acceptance Product Specifications (WAPS). The SB7b WAPS sample was also analyzed for chemical composition including noble metals and fissile constituents. At the Savannah River National Laboratory (SRNL) the 3-L Tank 40 SB7b sample was transferred from the shipping container into a 4-L high density polyethylene bottle and solids were allowed to settle over the weekend. Supernate was then siphoned off and circulated through the shipping container to complete the transfer of the sample. Following thorough mixing of the 3-L sample, a 558 g sub-sample was removed. This sub-sample was then utilized for all subsequent analytical samples. Eight separate aliquots of the slurry were digested, four with HNO{sub 3}/HCl (aqua regia) in sealed Teflon? vessels and four with NaOH/Na{sub 2}O{sub 2} (alkali or peroxide fusion) using Zr crucibles. Two Analytical Reference Glass ? 1 (ARG-1) standards were digested along with a blank for each preparation. Each aqua regia digestion and blank was diluted to 1:100 mL with deionized water and submitted to Analytical Development (AD) for inductively coupled plasma ? atomic emission spectroscopy (ICP-AES) analysis, inductively coupled plasma ? mass spectrometry (ICP-MS) analysis, atomic absorption spectroscopy (AA) for As and Se, and cold vapor atomic absorption spectroscopy (CV-AA) for Hg. Equivalent dilutions of the alkali fusion digestions and blank were submitted to AD for ICP-AES analysis. Tank 40 SB7b supernate was collected from a mixed slurry sample in the SRNL Shielded Cells and submitted to AD for ICP-AES, ion chromatography (IC), total base/free OH{sup -}/other base, total inorganic carbon/total organic carbon (TIC/TOC) analyses, and Cs-137 gamma scan. Weighted dilutions of slurry were submitted for IC, TIC/TOC, and total base/free OH-/other base analyses. Activities for U-233, U-235, and Pu-239 were determined from the ICP-MS data for the aqua regia digestions of the Tank 40 WAPS slurry using the specific activity of each isotope. The Pu-241 value was determined from a Pu-238/-241 method.

  7. SB Electronics Breaks Ground on New Factory | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin ofEnergy at Waste-to-Energy usingofRetrofittingFundA lSelectBuildingof328Report toSB

  8. Development of an electronic device quality aluminum antimonide (AlSb) semiconductor for solar cell applications

    DOE Patents [OSTI]

    Sherohman, John W; Yee, Jick Hong; Combs, III, Arthur W

    2014-11-11T23:59:59.000Z

    Electronic device quality Aluminum Antimonide (AlSb)-based single crystals produced by controlled atmospheric annealing are utilized in various configurations for solar cell applications. Like that of a GaAs-based solar cell devices, the AlSb-based solar cell devices as disclosed herein provides direct conversion of solar energy to electrical power.

  9. Speciation of Sb in airborne particulate matter, vehicle brake linings, and brake pad wear residues

    E-Print Network [OSTI]

    Short, Daniel

    Speciation of Sb in airborne particulate matter, vehicle brake linings, and brake pad wear residues: XAS XANES EXAFS Antimony Particulate matter Brake linings a b s t r a c t Insights into the speciation of Sb in samples of brake linings, brake pad wear residues, road dust, and atmospheric particulate

  10. Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3

    E-Print Network [OSTI]

    Shen, Guoyin

    Superconductivity in Strong Spin Orbital Coupling Compound Sb2Se3 P. P. Kong1 , F. Sun1,3 , L. Y induce Sb2Se3 into a topological nontrivial state. Here, we report on the discovery of superconductivity superconductive at high pressures above 10 GPa proceeded by a pressure induced insulator to metal like transition

  11. ccsd00001219 Superconducting phase diagram of the lled skuterrudite PrOs 4 Sb 12

    E-Print Network [OSTI]

    ccsd­00001219 (version 2) : 16 Mar 2004 Superconducting phase diagram of the #12;lled skuterrudite a precise magnetic #12;eld-temperature superconducting phase diagram of PrOs4Sb12 down to 350 mK. We discuss the superconducting phase diagram of PrOs4Sb12 and its possible relation with an unconventional superconducting order

  12. The quantum efficiency of InGaAsSb thermophotovoltaic diodes

    SciTech Connect (OSTI)

    Martinelli, R.U.; Garbuzov, D.Z.; Lee, H.; Morris, N.; Odubanjo, T.; Taylor, G.C.; Connolly, J.C. [Sarnoff Corp., Princeton, NJ (United States)

    1997-10-01T23:59:59.000Z

    Uncoated InGaAsSb/GaSb thermophotovoltaic (TPV) diodes with 0.56 eV (2.2 {micro}m) bandgaps exhibit external quantum efficiencies of 59% at 2 {micro}m, which corresponds to an internal quantum efficiency of 95%. The structures were grown by molecular-beam epitaxy. The devices have electron diffusion lengths as long as 29 {micro}m in 8-{micro}m-wide p-InGaAsSb layers and hole diffusion lengths of 3 {micro}m in 6-{micro}m-wide n-InGaAsSb layers. The electron and hole diffusion lengths appear to increase with increasing p- and n-layer widths, respectively. These excellent minority carrier transport properties of InGaAsSb are well-suited to efficient TPV diode operation.

  13. Band offsets determination and interfacial chemical properties of the Al2O3/GaSb system

    E-Print Network [OSTI]

    Yener, Aylin

    of a high quality dielectric/substrate interface. Native oxides of III­V com- pounds lead to the formation Sb is formed at the oxide/GaSb interface, which leads to a high leakage current.8 To overcome treatment. In contrast, NH4 2S and HCl solutions inhibit the Sb oxide formation. The lowest amount of Ga

  14. Illinois SB 1987: the Clean Coal Portfolio Standard Law

    SciTech Connect (OSTI)

    NONE

    2009-01-15T23:59:59.000Z

    On January 12, 2009, Governor Rod Blagojevich signed SB 1987, the Clean Coal Portfolio Standard Law. The legislation establishes emission standards for new coal-fueled power plants power plants that use coal as their primary feedstock. From 2009-2015, new coal-fueled power plants must capture and store 50 percent of the carbon emissions that the facility would otherwise emit; from 2016-2017, 70 percent must be captured and stored; and after 2017, 90 percent must be captured and stored. SB 1987 also establishes a goal of having 25 percent of electricity used in the state to come from cost-effective coal-fueled power plants that capture and store carbon emissions by 2025. Illinois is the first state to establish a goal for producing electricity from coal-fueled power plants with carbon capture and storage (CCS). To support the commercial development of CCS technology, the legislation guarantees purchase agreements for the first Illinois coal facility with CCS technology, the Taylorville Energy Center (TEC); Illinois utilities are required to purchase at least 5 percent of their electricity supply from the TEC, provided that customer rates experience only modest increases. The TEC is expected to be completed in 2014 with the ability to capture and store at least 50 percent of its carbon emissions.

  15. ST

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

    on the second floor adjacent to the high bay area where the liquid helium tanks and compressors are located. There was only one exit door from this control room. In the event of a...

  16. Florida Nuclear Profile - St Lucie

    U.S. Energy Information Administration (EIA) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5 Tables July 1996 Energy Information Administration Office of Coal, Nuclear,Light-Duty Vehicles,Year Jan Feb MarYeartotalFloridaSt

  17. Relaxation of photoinduced spins and carriers in ferromagnetic InMnSb films

    SciTech Connect (OSTI)

    Nontapot, K.; Kini, R. N.; Gifford, A.; Merritt, T. R.; Khodaparast, G. A.; Wojtowicz, T.; Liu, X.; Furdyna, J. K. [Department of Physics, Virginia Tech, Blacksburg, Virginia 24061 (United States); Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw (Poland); Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

    2007-04-02T23:59:59.000Z

    The authors report time resolved measurements and control of photoinduced spin and carrier relaxations in InMnSb ferromagnetic films with 2% Mn content (grown by low-temperature molecular beam epitaxy) using femtosecond laser pulses, and compare them to analogous measurements on InBeSb and InSb films. In this work, magneto-optical Kerr effect and standard pump-probe techniques provided a direct measure of the photoexcited spin and carrier lifetimes, respectively. They observe decrease in relaxations times in the high laser fluence regime and an absence of temperature dependence of the relaxation times.

  18. Nano-porosity in GaSb induced by swift heavy ion irradiation

    SciTech Connect (OSTI)

    Kluth, P., E-mail: patrick.kluth@anu.edu.au; Schnohr, C. S.; Giulian, R.; Araujo, L. L.; Lei, W.; Rodriguez, M. D.; Afra, B.; Bierschenk, T.; Ridgway, M. C. [Department of Electronic Materials Engineering, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia); Sullivan, J.; Weed, R. [ARC Centre for Antimatter-Matter Studies, AMPL, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200 (Australia); Li, W.; Ewing, R. C. [Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan 48109-1005 (United States)

    2014-01-13T23:59:59.000Z

    Nano-porous structures form in GaSb after ion irradiation with 185 MeV Au ions. The porous layer formation is governed by the dominant electronic energy loss at this energy regime. The porous layer morphology differs significantly from that previously reported for low-energy, ion-irradiated GaSb. Prior to the onset of porosity, positron annihilation lifetime spectroscopy indicates the formation of small vacancy clusters in single ion impacts, while transmission electron microscopy reveals fragmentation of the GaSb into nanocrystallites embedded in an amorphous matrix. Following this fragmentation process, macroscopic porosity forms, presumably within the amorphous phase.

  19. DWPF SIMULANT CPC STUDIES FOR SB7B

    SciTech Connect (OSTI)

    Koopman, D.

    2011-11-01T23:59:59.000Z

    Lab-scale DWPF simulations of Sludge Batch 7b (SB7b) processing were performed. Testing was performed at the Savannah River National Laboratory - Aiken County Technology Laboratory (SRNL-ACTL). The primary goal of the simulations was to define a likely operating window for acid stoichiometry for the DWPF Sludge Receipt and Adjustment Tank (SRAT). In addition, the testing established conditions for the SRNL Shielded Cells qualification simulation of SB7b-Tank 40 blend, supported validation of the current glass redox model, and validated the coupled process flowsheet at the nominal acid stoichiometry. An acid window of 105-140% by the Koopman minimum acid (KMA) equation (107-142% DWPF Hsu equation) worked for the sludge-only flowsheet. Nitrite was present in the SRAT product for the 105% KMA run at 366 mg/kg, while SME cycle hydrogen reached 94% of the DWPF Slurry Mix Evaporator (SME) cycle limit in the 140% KMA run. The window was determined for sludge with added caustic (0.28M additional base, or roughly 12,000 gallons 50% NaOH to 820,000 gallons waste slurry). A suitable processing window appears to be 107-130% DWPF acid equation for sludge-only processing allowing some conservatism for the mapping of lab-scale simulant data to full-scale real waste processing including potentially non-conservative noble metal and mercury concentrations. This window should be usable with or without the addition of up to 7,000 gallons of caustic to the batch. The window could potentially be wider if caustic is not added to SB7b. It is recommended that DWPF begin processing SB7b at 115% stoichiometry using the current DWPF equation. The factor could be increased if necessary, but changes should be made with caution and in small increments. DWPF should not concentrate past 48 wt.% total solids in the SME cycle if moderate hydrogen generation is occurring simultaneously. The coupled flowsheet simulation made more hydrogen in the SRAT and SME cycles than the sludge-only run with the same acid stoichiometric factor. The slow acid addition in MCU seemed to alter the reactions that consumed the small excess acid present such that hydrogen generation was promoted relative to sludge-only processing. The coupled test reached higher wt.% total solids, and this likely contributed to the SME cycle hydrogen limit being exceeded at 110% KMA. It is clear from the trends in the SME processing GC data, however, that the frit slurry formic acid contributed to driving the hydrogen generation rate above the SME cycle limit. Hydrogen generation rates after the second frit addition generally exceeded those after the first frit addition. SRAT formate loss increased with increasing acid stoichiometry (15% to 35%). A substantial nitrate gain which was observed to have occurred after acid addition (and nitrite destruction) was reversed to a net nitrate loss in runs with higher acid stoichiometry (nitrate in SRAT product less than sum of sludge nitrate and added nitric acid). Increased ammonium ion formation was also indicated in the runs with nitrate loss. Oxalate loss on the order 20% was indicated in three of the four acid stoichiometry runs and in the coupled flowsheet run. The minimum acid stoichiometry run had no indicated loss. The losses were of the same order as the official analytical uncertainty of the oxalate concentration measurement, but were not randomly distributed about zero loss, so some actual loss was likely occurring. Based on the entire set of SB7b test data, it is recommended that DWPF avoid concentrating additional sludge solids in single SRAT batches to limit the concentrations of noble metals to SB7a processing levels (on a grams noble metal per SRAT batch basis). It is also recommended that DWPF drop the formic acid addition that accompanies the process frit 418 additions, since SME cycle data showed considerable catalytic activity for hydrogen generation from this additional acid (about 5% increase in stoichiometry occurred from the frit formic acid). Frit 418 also does not appear to need formic acid addition to prevent gel formation in

  20. Time-course analysis of the Shewanella amazonensis SB2B proteome...

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

    the membrane fatty acid composition (due to induction of branched chain amino acid degradation pathways); however, we show this is not the case for SB2B. Although proteins and...

  1. Planning for sustainable communities: Regional incentives and local policy under SB375

    E-Print Network [OSTI]

    California at Davis, University of

    Planning for sustainable communities: Regional incentives and local policy under SB375 Gian Institute Policy for Energy, Environment and the Economy University of California, Davis March 19, 2014 impacts access density alternatives sustainability #12;Sustainable Communities Strategy (SCS) San Diego

  2. Controlling SEI Formation on SnSb-Porous Carbon Nanofibers for...

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

    for Improved Na Ion Storage. Abstract: Porous carbon nanofiber (CNF)-supported tin-antimony (SnSb) alloys is synthesized and applied as sodium ion battery anode. The...

  3. Theoretical study of defect formation during the initial stages of native-oxide growth on GaSb (001)

    SciTech Connect (OSTI)

    Bermudez, V. M., E-mail: victor.bermudez@nrl.navy.mil [Electronics Science and Technology Division, U.S. Naval Research Laboratory, Washington, DC 20375 (United States)

    2014-04-07T23:59:59.000Z

    The formation of defects during the initial stages of native-oxide growth on the GaSb (001)-?(4?×?3) surface has been studied computationally using spin-unrestricted density functional theory. It is found that insertion into a Ga-Sb adatom dimer to form a peroxo Ga-O-O-Sb bridge is the most energetically favorable process with insertion into Ga-Sb back-bonds being somewhat less so. A Ga-O-O-Ga bridge between dimers is also favorable, but Sb-O-O-Sb bridges show little if any stability. In the course of analyzing molecular adsorption, a particularly reactive site has been identified that leads to O{sub 2} dissociation with little or no barrier. This process is initiated in the vicinity of an Sb-Sb dimer in the terminating layer and leads to sub-surface Ga and Sb defect sites (i.e., coordinatively unsaturated atoms) and to strained Ga-Sb bonds that may be susceptible to further O{sub 2} attack. However, the defects formed in these reactions do not produce states in the gap.

  4. GaAsSb-based heterojunction tunnel diodes for tandem solar cell interconnects

    SciTech Connect (OSTI)

    Zolper, J.C.; Klem, J.F.; Plut, T.A.; Tigges, C.P.

    1995-01-01T23:59:59.000Z

    We report a new approach to tunnel junctions that employs a pseudomorphic GaAsSb layer to obtain a band alignment at a InGaAs or InAlAs p-n junction favorable for forward bias tunneling. Since the majority of the band offset between GaAsSb and InGaAs or InAlAs is in the valence band, when an GaAsSb layer is placed at an InGaAs or InAlAs p-n junction the tunneling distance is reduced and the tunneling current is increased. For all doping levels studied, the presence of the GaAsSb-layer enhanced the forward tunneling characteristics. In fact, in a InGaAs/GaAsSb tunnel diode a peak tunneling current sufficient for a 1000 sun intercell interconnect was achieved with p = 1.5{times}l0{sup 18} cm{sup -3} while a similarly doped all-InGaAs diode was rectifying. This approach affords a new degree of freedom in designing tunnel junctions for tandem solar cell interconnects. Previously only doping levels could be varied to control the tunneling properties. Our approach relaxes the doping requirements by employing a GaAsSb-based heterojunction.

  5. Ab-Initio Determination of Novel Crystal Structures of the Thermoelectric Material MgAgSb

    SciTech Connect (OSTI)

    Kirkham, Melanie J [ORNL; Moreira Dos Santos, Antonio F [ORNL; Rawn, Claudia J [ORNL; Lara-Curzio, Edgar [ORNL; Sharp, Jeff W. [Marlow Industries, Inc; Thompson, Alan [Marlow Industries, Inc

    2012-01-01T23:59:59.000Z

    Materials with the half-Heusler structure possess interesting electrical and magnetic properties, including potential for thermoelectric applications. MgAgSb is compositionally and structurally related to many half-Heusler materials, but has not been extensively studied. This work presents the high-temperature X-ray diffraction analysis of MgAgSb between 27 and 420 C, complemented with thermoelectric property measurements. MgAgSb is found to exist in three different structures in this temperature region, taking the half-Heusler structure at high temperatures, a Cu2Sb-related structure at intermediate temperatures, and a previously unreported tetragonal structure at room temperature. All three structures are related by a distorted Mg-Sb rocksalt-type sublattice, differing primarily in the Ag location among the available tetrahedral sites. Transition temperatures between the three phases correlate well with discontinuities in the Seebeck coefficient and electrical conductivity; the best performance occurs with the novel room temperature phase. For application of MgAgSb as a thermoelectric material, it may be desirable to develop methods to stabilize the room temperature phase at higher temperatures.

  6. St. Lucie Data Dashboard | Department of Energy

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Site EnvironmentalEnergySafelyVirtual Toolkit Spring 2015 Virtual ToolkitSpurringSt.St.St.

  7. Density functional simulations of phase change materials: disordered phases of Ge8Sb2Te11 and Ag/In/Sb/Te alloys

    E-Print Network [OSTI]

    E*PCOS2009 Density functional simulations of phase change materials: disordered phases of Ge8Sb2Te75.0Te17.7 (AIST). These represent two families used widely as phase change materials: pseudobinary and more flexible than those of Ag. Key words: Phase change materials, density functional calculations

  8. Influence of GaAs surface termination on GaSb/GaAs quantum dot structure and band offsets

    SciTech Connect (OSTI)

    Zech, E. S.; Chang, A. S.; Martin, A. J.; Canniff, J. C.; Millunchick, J. M. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States)] [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States); Lin, Y. H. [Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States)] [Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States); Goldman, R. S. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States) [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States); Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States)

    2013-08-19T23:59:59.000Z

    We have investigated the influence of GaAs surface termination on the nanoscale structure and band offsets of GaSb/GaAs quantum dots (QDs) grown by molecular-beam epitaxy. Transmission electron microscopy reveals both coherent and semi-coherent clusters, as well as misfit dislocations, independent of surface termination. Cross-sectional scanning tunneling microscopy and spectroscopy reveal clustered GaSb QDs with type I band offsets at the GaSb/GaAs interfaces. We discuss the relative influences of strain and QD clustering on the band offsets at GaSb/GaAs interfaces.

  9. Recent progress in GaInAsSb thermophotovoltaics grown by organometallic vapor phase epitaxy

    SciTech Connect (OSTI)

    Wang, C.A.; Choi, H.K.; Oakley, D.C. [Massachusetts Inst. of Tech., Lexington, MA (United States). Lincoln Lab.; Charache, G.W. [Lockheed Martin, Inc., Schenectady, NY (United States)

    1998-06-01T23:59:59.000Z

    Studies on the materials development of Ga{sub 1{minus}x}In{sub x}As{sub y}Sb{sub 1{minus}y} alloys for thermophotovoltaic (TPV) devices are reviewed. Ga{sub 1{minus}x}In{sub x}As{sub y}Sb{sub 1{minus}y} epilayers were grown lattice matched to GaSb substrates by organometallic vapor phase epitaxy (OMVPE) using all organometallic precursors including triethylgallium, trimethylindium, tertiarybutylarsine, and trimethylantimony with diethyltellurium and dimethylzinc as the n- and p-type dopants, respectively. The overall material quality of these alloys depends on growth temperature, In content, V/III ratio, substrate misorientation, and to a lesser extent, growth rate. A mirror-like surface morphology and room temperature photoluminescence (PL) are obtained for GaInAsSb layers with peak emission in the wavelength range between 2 and 2.5 {micro}m. The crystal quality improves for growth temperature decreasing from 575 to 525 C, and with decreasing In content, as based on epilayer surface morphology and low temperature PL spectra. A trend of smaller full width at half-maximum for low temperature PL spectra is observed as the growth rate is increased from 1.5 to 2.5 and 5 {micro}m/h. In general, GaInAsSb layers grown on (100) GaSb substrates with a 6{degree} toward (111)B misorientation exhibited overall better material quality than layers grown on the more standard substrate (100)2{degree} toward (110). Consistent growth of high performance lattice-matched GaInAsSb TPV devices is also demonstrated.

  10. OMVPE growth and characterization of GaInAsSb for thermophotovoltaics

    SciTech Connect (OSTI)

    Wang, C.A.; Charache, G.W.

    1998-06-01T23:59:59.000Z

    Studies on the materials development of Ga{sub 1{minus}x}In{sub x}As{sub y}Sb{sub 1{minus}y} alloys for thermophotovoltaic (TPV) devices are reviewed. Ga{sub 1{minus}x}In{sub x}As{sub y}Sb{sub 1{minus}y} epilayers were grown lattice matched to GaSb substrates by organometallic vapor phase epitaxy (OMVPE) using all organometallic precursors including triethylgallium, trimethylindium, tertiarybutylarsine, and trimethylantimony with diethyltellurium and dimethylzinc as the n- and p-type dopants, respectively. The overall material quality of these alloys depends on growth temperature, In content, V/III ratio, substrate misorientation, and to a lesser extent, growth rate. A mirror-like surface morphology and room temperature photoluminescence (PL) are obtained for GaInAsSb layers with peak emission in the wavelength range between 2 and 2.5 {micro}m. The crystal quality improves for growth temperature decreasing from 575 to 525 C, and with decreasing In content, as based on epilayer surface morphology and low temperature PL spectra. A trend of smaller full width at half-maximum for low temperature PL spectra is observed as the growth rate is increased from 1.5 to 2.5 and 5 {micro}m/h. In general, GaInAsSb layers grown on (100) GaSb substrates with a 6{degree} toward (111)B misorientation exhibited overall better material quality than layers grown on the more standard substrate (100) 2{degree} toward (110). Consistent growth of high performance lattice-matched GaInAsSb TPV devices is also demonstrated.

  11. Project StORe: Physics Report 

    E-Print Network [OSTI]

    Bull, Stephen

    Results are presented on the Physics Survey of Researcher Use of Repositories which constitutes the culmination of Work Package 2 (in Physics) of Project StORe (Source to Output Repositories). The data were obtained by ...

  12. Laboratories for the 21st Century

    Broader source: Energy.gov [DOE]

    Laboratories for the 21st Century (Labs21) is a voluntary partnership program dedicated to improving the environmental performance of U.S. laboratories. The program is a joint initiative between...

  13. City of St. George- Net Metering

    Broader source: Energy.gov [DOE]

    The St. George City Council adopted a [http://www.sgcity.org/wp/power/NetMeteringPolicy.pdf net-metering program for area utilities], including interconnection procedures, in October 2005.* The...

  14. PROPOSED PLAN FOR THE ST. LOUIS NORTH COUNTY SITE

    E-Print Network [OSTI]

    US Army Corps of Engineers

    remedial investigation RME reasonable maximum exposure ROD Record of Decision SLAPS St. Louis Airport Site

  15. Semiconductor structures having electrically insulating and conducting portions formed from an AlSb-alloy layer

    DOE Patents [OSTI]

    Spahn, Olga B. (Albuquerque, NM); Lear, Kevin L. (Albuquerque, NM)

    1998-01-01T23:59:59.000Z

    A semiconductor structure. The semiconductor structure comprises a plurality of semiconductor layers formed on a substrate including at least one layer of a III-V compound semiconductor alloy comprising aluminum (Al) and antimony (Sb), with at least a part of the AlSb-alloy layer being chemically converted by an oxidation process to form superposed electrically insulating and electrically conducting portions. The electrically insulating portion formed from the AlSb-alloy layer comprises an oxide of aluminum (e.g. Al.sub.2 O.sub.3), while the electrically conducting portion comprises Sb. A lateral oxidation process allows formation of the superposed insulating and conducting portions below monocrystalline semiconductor layers for forming many different types of semiconductor structures having particular utility for optoelectronic devices such as light-emitting diodes, edge-emitting lasers, vertical-cavity surface-emitting lasers, photodetectors and optical modulators (waveguide and surface normal), and for electronic devices such as heterojunction bipolar transistors, field-effect transistors and quantum-effect devices. The invention is expected to be particularly useful for forming light-emitting devices for use in the 1.3-1.6 .mu.m wavelength range, with the AlSb-alloy layer acting to define an active region of the device and to effectively channel an electrical current therein for efficient light generation.

  16. GaSb based ternary and quaternary diffused junction devices for TPV applications

    SciTech Connect (OSTI)

    Sundaram, V.S.; Saban, S.B.; Morgan, M.D.; Horne, W.E.; Evans, B.D.; Ketterl, J.R. [EDTEK Inc. 7082 S. 220th Street Kent, Washington 98032 (United States); Morosini, M.B.; Patel, N.B. [Instituto de Fisica, UNICAMP, Campinas, Brasil (Brazil); Field, H. [NREL, Golden, Colorado (United States)

    1997-03-01T23:59:59.000Z

    In this work we report the characteristics of ternary, GaInSb (Eg=0.70eV) and quarternary, GaInAsSb (Eg=0.5eV) diffused junction photovoltaic devices. The unique feature of the quarternary device is the extended long-wavelength response to 2.1 microns enabling the efficient use of the blackbody-like thermal sources operating at 1373 K in thermophotovoltaic energy conversion systems. The ternary device was fabricated by diffusing zinc into a n-type (100) oriented GaInSb substrate. For the quarternary, a four micron thick Te doped GaInAsSb layer grown by LPE on a n-type GaSb(100) wafer was used as the starting substrate for zinc diffusion. The ternary device exhibits an open circuit voltage of 0.38 V, Fill Factor of 0.63 and a short circuit current of 0.8A/cm{sup 2}, while the corresponding values for the quarternary device are 0.25 V, 0.58 and 0.8A/cm{sup 2}, respectively. The peak internal quantum efficiency for the ternary is over 90{percent} and that of the quarternary is above 75{percent}. Process optimization should improve the performance charcateristics of the quarternary. {copyright} {ital 1997 American Institute of Physics.}

  17. Semiconductor structures having electrically insulating and conducting portions formed from an AlSb-alloy layer

    DOE Patents [OSTI]

    Spahn, O.B.; Lear, K.L.

    1998-03-10T23:59:59.000Z

    The semiconductor structure comprises a plurality of semiconductor layers formed on a substrate including at least one layer of a III-V compound semiconductor alloy comprising aluminum (Al) and antimony (Sb), with at least a part of the AlSb-alloy layer being chemically converted by an oxidation process to form superposed electrically insulating and electrically conducting portions. The electrically insulating portion formed from the AlSb-alloy layer comprises an oxide of aluminum (e.g., Al{sub 2}O{sub 3}), while the electrically conducting portion comprises Sb. A lateral oxidation process allows formation of the superposed insulating and conducting portions below monocrystalline semiconductor layers for forming many different types of semiconductor structures having particular utility for optoelectronic devices such as light-emitting diodes, edge-emitting lasers, vertical-cavity surface-emitting lasers, photodetectors and optical modulators (waveguide and surface normal), and for electronic devices such as heterojunction bipolar transistors, field-effect transistors and quantum-effect devices. The invention is expected to be particularly useful for forming light-emitting devices for use in the 1.3--1.6 {mu}m wavelength range, with the AlSb-alloy layer acting to define an active region of the device and to effectively channel an electrical current therein for efficient light generation. 10 figs.

  18. (GeTe){sub n}SbInTe{sub 3} (n?3)—Element distribution and thermal behavior

    SciTech Connect (OSTI)

    Fahrnbauer, Felix; Urban, Philipp; Welzmiller, Simon [Institute for Mineralogy, Crystallography and Materials Science, Leipzig University, Scharnhorststraße 20, 04275 Leipzig (Germany); Schröder, Thorsten; Rosenthal, Tobias [Department of Chemistry, Ludwig Maximilian University, Butenandtstraße 5-13, 81377 Munich (Germany); Oeckler, Oliver, E-mail: oliver.oeckler@gmx.de [Institute for Mineralogy, Crystallography and Materials Science, Leipzig University, Scharnhorststraße 20, 04275 Leipzig (Germany); Department of Chemistry, Ludwig Maximilian University, Butenandtstraße 5-13, 81377 Munich (Germany)

    2013-12-15T23:59:59.000Z

    Antimony in germanium antimony tellurides (GeTe){sub n}(Sb{sub 2}Te{sub 3}) can be substituted by indium. Homogeneous bulk samples of GeSbInTe{sub 4} (R3-bar m, Z=3, a=4.21324(5) Å, c=41.0348(10) Å) and Ge{sub 2}SbInTe{sub 5} (P3-bar m1, Z=1, a=4.20204(6) Å, c=17.2076(4) Å) were obtained; their structures were refined with the Rietveld method. Single-crystal X-ray diffraction using synchrotron radiation at the K edges of Sb and Te (exploiting anomalous dispersion) yields precise information on the element distribution in the trigonal layered structure of Ge{sub 3}SbInTe{sub 6} (R3-bar m, Z=3, a=4.19789(4) Å, c=62.1620(11) Å). The structure is characterized by van der Waals gaps between distorted rocksalt-type slabs of alternating cation and anion layers. The cation concentration is commensurately modulated with Sb preferring the positions near the gaps. In contrast to unsubstituted Ge{sub 3}Sb{sub 2}Te{sub 6}, quenching the NaCl-type high-temperature phase (stable above ?510 °C) easily yields a pseudocubic modification that is metastable at ambient conditions. Temperature-dependent powder diffraction reveals a broader stability range of the cubic high-temperature modification of Ge{sub 3}SbInTe{sub 6} compared to the ternary phases. In-containing samples partially decompose at ca. 300 °C but become homogeneous again when the high-temperature phase is formed. - Graphical abstract: Crystal structure of 33R-Ge{sub 3}SbInTe{sub 6} as determined by resonant X-ray diffraction, one example of the (GeTe){sub n}SbInTe{sub 3} series of compounds investigated. - Highlights: • The new compounds 21R-GeSbInTe{sub 4}, 9P-Ge{sub 2}SbInTe{sub 5} and 33R-Ge{sub 3}SbInTe are described. • The element distribution in 33R-Ge{sub 3}SbInTe{sub 6} was determined by resonant scattering. • The cation concentration in the crystal structure is strongly modulated. • The Sb substitution by In has a significant impact on phase transitions. • Results may be relevant for thermoelectrics and thin-film phase-change materials.

  19. JOURNAL DE PHYSIQUE CoZZoque C8, supplgment au n08, Tome 42, aoGt 2980, page C8-519 ELECTRICAL RESISTIVITY AND THERMOELECTRIC POWER OF LIQUID Ge-Sb AND Pb-Sb ALLOYS

    E-Print Network [OSTI]

    Boyer, Edmond

    RESISTIVITY AND THERMOELECTRIC POWER OF LIQUID Ge-Sb AND Pb-Sb ALLOYS A. Bath, J.G. Gasser, J.L. Bretonnet, R Metz, France. Abstract.- The resistivity p and the thermoelectric power S have been measured experimental data on resistivi- ty and thermoelectric power (T.E.P.) for these two systems, and to discuss them

  20. Electron Scattering in InSb Quantum Wells due to Micro-twin Defects

    SciTech Connect (OSTI)

    Mishima, T. D.; Santos, M. B. [Homer L. Dodge Department of Physics and Astronomy, and Center for Semiconductor Physics in Nanostructure University of Oklahoma, 440 W. Brooks St., Norman, OK 73019 (United States)

    2011-12-26T23:59:59.000Z

    The transport electron scattering due to micro-twin (MT) defects in InSb quantum wells (QWs) has been investigated at room temperature (RT). A linear-regression-based scattering analysis showed that Matthiessen's rule is applicable to the RT electron mobility in 20-nm-thick InSb QWs that contain MTs (whose density is 5.6x10{sup 2}-1.2x10{sup 4} /cm) and threading dislocations (8.7x10{sup 8}-3.2x10{sup 9} /cm{sup 2}) as dominant structural defects. For such an InSb QW whose local electron mobility in its non-MT regions is 2.8x10{sup 4}-4.5x10{sup 4} cm{sup 2}/(Vs), the MT-originated energy barrier against the electron transport is deduced to be 0.081-0.093 eV at RT.

  1. Key experimental information on intermediate-range atomic structures in amorphous Ge2Sb2Te5 phase change material

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    .1063/1.3657139 Nature of phase transitions in crystalline and amorphous GeTe-Sb2Te3 phase change materials J. Chem. Phys on intermediate-range atomic structures in amorphous Ge2Sb2Te5 phase change material Shinya Hosokawa,1,2,a) Wolf change material Shinya Hosokawa, Wolf-Christian Pilgrim, Astrid Höhle, Daniel Szubrin, Nathalie Boudet

  2. Evaluation Of Glass Density To Support The Estimation Of Fissile Mass Loadings From Iron Concentrations In SB8 Glasses

    SciTech Connect (OSTI)

    Edwards, T. B.; Peeler, D. K.; Kot, W. K.; Gan, H.; Pegg, I. L.

    2013-04-30T23:59:59.000Z

    The Department of Energy – Savannah River (DOE-SR) has provided direction to Savannah River Remediation (SRR) to maintain fissile concentration in glass below 897 g/m{sup 3}. In support of that guidance, the Savannah River National Laboratory (SRNL) provided a technical basis and a supporting Microsoft® Excel® spreadsheet for the evaluation of fissile loading in Sludge Batch 5 (SB5), Sludge Batch 6 (SB6), Sludge Batch 7a (SB7a), and Sludge Batch 7b (SB7b) glass based on the iron (Fe) concentration in glass as determined by the measurements from the Slurry Mix Evaporator (SME) acceptability analysis. SRR has since requested that the necessary density information be provided to allow SRR to update the Excel® spreadsheet so that it may be used to maintain fissile concentration in glass below 897 g/m{sup 3} during the processing of Sludge Batch 8 (SB8). One of the primary inputs into the fissile loading spreadsheet includes an upper bound for the density of SB8-based glasses. Thus, these bounding density values are to be used to assess the fissile concentration in this glass system. It should be noted that no changes are needed to the underlying structure of the Excel-based spreadsheet to support fissile assessments for SB8. However, SRR should update the other key inputs to the spreadsheet that are based on fissile and Fe concentrations reported from the SB8 Waste Acceptance Product Specification (WAPS) sample.

  3. Electronic and structural response of InSb to ultra-short and ultra-intense laser pulses

    E-Print Network [OSTI]

    Burzo, Andrea Mihaela

    2001-01-01T23:59:59.000Z

    of the behavior of InSb following application of ultra-short and ultra-intense laser pulses. Motivated directly by these experiments, we have performed simulations of the electron-ion dynamics of InSb subjected to femtosecond-scale laser pulses. These simulations...

  4. Development of Bi-Sb-Te ternary alloy with compositionally graded structure

    SciTech Connect (OSTI)

    Yamamoto, A.; Ohta, T.

    1997-07-01T23:59:59.000Z

    Compositionally graded p-type Bi-Sb-Te thermoelectric material was synthesized by PIES (Pulverized and Intermixed Elements Sintering) method. The materials consisted of three segmented regions of different alloy composition, i.e., y = 0.8/0.825/0.9 in (Bi{sub 2}Te{sub 3}){sub 1{minus}y} (Sb{sub 2}Te{sub 3}){sub y} system. It was found that the electrical power output of the compositionally graded material was larger than that of the best single composition material when the temperature difference was the designed value.

  5. Prospects of nanostructures Bi{sub 1-x}Sb{sub x} for thermoelectricity

    SciTech Connect (OSTI)

    Nikolaeva, Albina A., E-mail: A.Nikolaeva@nano.asm.md [Gitsu Institute of Electronic Engineering and Nanotechnologies, Academiei 3/3, MD-2028, Chisinau, Republic of Moldova (Moldova, Republic of); International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw (Poland); Konopko, Leonid A. [Gitsu Institute of Electronic Engineering and Nanotechnologies, Academiei 3/3, MD-2028, Chisinau, Republic of Moldova (Moldova, Republic of) [Gitsu Institute of Electronic Engineering and Nanotechnologies, Academiei 3/3, MD-2028, Chisinau, Republic of Moldova (Moldova, Republic of); International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw (Poland); Huber, Tito E. [Department of Chemistry, Howard University, 500 College St. N.W., DC 20059, Washington (United States)] [Department of Chemistry, Howard University, 500 College St. N.W., DC 20059, Washington (United States); Bodiul, Pavel P.; Popov, Ivan A. [Gitsu Institute of Electronic Engineering and Nanotechnologies, Academiei 3/3, MD-2028, Chisinau, Republic of Moldova (Moldova, Republic of)] [Gitsu Institute of Electronic Engineering and Nanotechnologies, Academiei 3/3, MD-2028, Chisinau, Republic of Moldova (Moldova, Republic of)

    2012-09-15T23:59:59.000Z

    It has been predicted that surface states of topological insulators have large a thermopower and also ultrahigh mobilities. The authors report results of a magneto-thermoelectric investigation of single crystal Bi{sub 1-x}Sb{sub x} nanowires in a glass cover with diameters ranging from 90 nm to 5 {mu}m. The wide-ranging antimony concentration enabled us to study the effect of nanowire dimensionality in the semimetal, semi-conductor and gapless regimes. Quantum size effects in Bi-2 at%Sb nanowires, which are shown in temperature dependences of resistance R(T) and thermopower {alpha}(T) for the diameters significantly higher than the critical diameter for pure Bi-wires, are observed. The thermopower in weak magnetic fields, reaches values +400 {mu}V/K at T=20-40 K. Power factor {alpha}{sup 2}{sigma} depending on diameter of wires, structure, temperature and magnetic field is calculated. In connection with topological insulators, we will discuss the surface effect in the thermoelectric properties that we observe. - Graphical abstract: Temperature dependences of resistance R{sub T}/R{sub 300}(T) (a) for Bi-2 at%Sb wires various diameters d: 1-d=300 nm, 2-d=400 nm, 3-d=600 nm, 4-d=1600 nm. Inset (a) SEM cross sectional image of the 650 nm Bi-2 at%Sb wire (clear) in glass envelope (gray). The magnetic field dependences thermopower (H Double-Vertical-Line {Delta}T) (b) Bi-2 at%Sb wires, with different diameters: (1). d=300 nm, (2). d=400 nm, (3). d=600 nm, T=26 K. Highlights: Black-Right-Pointing-Pointer SMSC transition in semimetal Bi-Sb wires due to the quantum size effect is observed. Black-Right-Pointing-Pointer In Bi-6 at%Sb wires alloys has been realized the gapless (GL) state. Black-Right-Pointing-Pointer In the area GS state abnormal growth thermopower in magnetic fields is found out. Black-Right-Pointing-Pointer Semiconductor Bi{sub 1-x} Sb{sub x} nanowires manifest properties of the topological insulators.

  6. Nanoscale structure in AgSbTe2 determined by diffuse elastic neutron scattering

    SciTech Connect (OSTI)

    Specht, Eliot D [ORNL; Ma, Jie [ORNL; Delaire, Olivier A [ORNL; Budai, John D [ORNL; May, Andrew F [ORNL; Karapetrova, Evguenia A. [Argonne National Laboratory (ANL)

    2015-01-01T23:59:59.000Z

    Diffuse elastic neutron scattering measurements confirm that AgSbTe2 has a hierarchical structure, with defects on length scales from nanometers to microns. While scattering from mesoscale structure is consistent with previously-proposed structures in which Ag and Sb order on a NaCl lattice, more diffuse scattering from nanoscale structure suggests a structural rearrangement in which hexagonal layers form a combination of (ABC), (ABA), and (AAB) stacking sequences. The AgCrSe2 structure is the best-fitting model for the local atomic arrangements.

  7. Flat Plate PV Module Eligibility Listing Procedure Updated 6/2/14 Senate Bill 1 (SB1) defines the solar incentive programs for California, and flat plate PV

    E-Print Network [OSTI]

    Flat Plate PV Module Eligibility Listing Procedure Updated 6/2/14 Senate Bill 1 (SB1) defines the solar incentive programs for California, and flat plate PV modules 1 must be listed on the SB1 for adding PV modules to the SB1 list is as follows: 1 . Data submitted to the Energy Commission

  8. Frit Development Efforts for Sludge Batch 4 (SB4): Operating Window Assessments fo Scenarios Leading Up to the Selected Preparation Plan for SB4

    SciTech Connect (OSTI)

    Peeler, D

    2006-03-21T23:59:59.000Z

    The objective of this report is to document technical information that has been provided to Defense Waste Processing Facility (DWPF) and Closure Business Unit (CBU) personnel as part of the frit development support for Sludge Batch 4 (SB4). The information presented in this report includes projected operating windows (expressed in terms of waste loading) for various sludge blending and/or washing options coupled with candidate frits of interest. Although the Nominal Stage assessment serves as the primary tool for these evaluations, select systems were also evaluated using a Variation Stage assessment in which compositional variations were introduced. In addition, assessments of the impacts of nepheline formation potential and the SO{sub 4}{sup -} solubility limit on the projected operating windows are also provided. Although this information was used as part of the technical basis leading to CBU's development of the preferred SB4 preparation plan, none of the options presented in this report was selected as the preferred plan. Therefore, the information is presented without significant interpretation of the resulting operating windows, but the projected windows are provided so additional insight can be explored if desired. Detailed assessments of the projected operating windows (using both Nominal and Variation Stage assessments) of the preferred sludge preparation plan with candidate frits are to be documented elsewhere. The information provided in this report is focused solely on model-based projections of the operating windows for various SB4 blending strategies of interest. Although nepheline formation potential is monitored via model predictions as a part of this assessment, experimental work investigating the impact of nepheline on glass quality is also being addressed in a parallel study. The results of this paper study and the experimental assessments of melt rate, SO{sub 4} solubility, and/or nepheline formation potential are all critical components of the inputs into the frit selection process for SB4.

  9. 0.52eV Quaternary InGaAsSb Thermophotovoltaic Diode Technology

    SciTech Connect (OSTI)

    MW Dashiell; JF Beausang; G Nichols; DM Depoy; LR Danielson; H Ehsani; KD Rahner; J Azarkevich; P Talamo; E Brown; S Burger; P Fourspring; W Topper; PF Baldasaro; CA Wang; R Huang; M Connors; G Turner; Z Shellenbarger; G Taylor; Jizhong Li; R Marinelli; D Donetski; S Anikeev; G Belenky; S Luryi; DR Taylor; J Hazel

    2004-06-09T23:59:59.000Z

    Thermophotovoltaic (TPV) diodes fabricated from 0.52eV lattice-matched InGaAsSb alloys are grown by Metal Organic Vapor Phase Epitaxy (MOVPE) on GaSb substrates. 4cm{sup 2} multi-chip diode modules with front-surface spectral filters were tested in a vacuum cavity and attained measured efficiency and power density of 19% and 0.58 W/cm{sup 2} respectively at operating at temperatures of T{sub radiator} = 950 C and T{sub diode} = 27 C. Device modeling and minority carrier lifetime measurements of double heterostructure lifetime specimens indicate that diode conversion efficiency is limited predominantly by interface recombination and photon energy loss to the GaSb substrate and back ohmic contact. Recent improvements to the diode include lattice-matched p-type AlGaAsSb passivating layers with interface recombination velocities less than 100 cm/s and new processing techniques enabling thinned substrates and back surface reflectors. Modeling predictions of these improvements to the diode architecture indicate that conversion efficiencies from 27-30% and {approx}0.85 W/cm{sup 2} could be attained under the above operating temperatures.

  10. Template Synthesis of Hollow Sb Nanoparticles as a High-Performance Lithium Battery Anode Material

    E-Print Network [OSTI]

    Cho, Jaephil

    Template Synthesis of Hollow Sb Nanoparticles as a High-Performance Lithium Battery Anode Material­14 the use of metal and carbon composites,15­20 and the introduction of nano- sized metals,21­25 have been reported. Studies involving hollow lithium reactive metal, however, have yet to be reported, although

  11. Engineering Sciences SB ESE Track Rev. July 2014 1/6

    E-Print Network [OSTI]

    Chou, James

    b or 21a) AM 101 ­ Statistical Inference for Scientists & Engineers ES 150 ­ Intro to Probability with Engineering Applications Statistics 110 ­ Introduction to Probability 1.0 _______ Applied Mathematics (1halfEngineering Sciences SB ­ ESE Track Rev. July 2014 1/6 Plan of Study for the Environmental Science

  12. Grain refinement and texture development of cast bi90sb10 alloy via severe plastic deformation

    E-Print Network [OSTI]

    Im, Jae-taek

    2009-05-15T23:59:59.000Z

    The purpose of this work was to study learn about grain refinement mechanisms and texture development in cast n-type Bi90Sb10 alloy caused by severe plastic deformation. The practical objective is to produce a fine grained and textured...

  13. Superconductivity in Topological Insulator Sb2Te3 Induced by Pressure

    E-Print Network [OSTI]

    Wang, Wei Hua

    Superconductivity in Topological Insulator Sb2Te3 Induced by Pressure J. Zhu1 *, J. L. Zhang1 *, P superconductivity and topology nature. A s new states of quantum matter, topological insulators are characterized to topological insulators, topological superconductors are expected to have a full pairing gap in the bulk

  14. Defining Good Infill A Convening Report on SB 226 and the California

    E-Print Network [OSTI]

    Kammen, Daniel M.

    with the facilitation of the discussion and presented their draft regulations for feedback. This report provides a brief) and SB 375 (Steinberg), state planning priorities, water conservation and energy efficiency standards, the performance standards include requirements that residential and commercial projects meet or exceed specified

  15. High resolution InSb quantum well ballistic nanosensors for room temperature applications

    SciTech Connect (OSTI)

    Gilbertson, Adam; Cohen, L. F. [Blackett Laboratory, Imperial College London, SW7 2BZ (United Kingdom); Lambert, C. J. [Department of Physics, Lancaster University, Lancaster, LA1 4YB (United Kingdom); Solin, S. A. [Department of Physics, Washington University in St. Louis, St. Louis, Missouri 63130 (United States)

    2013-12-04T23:59:59.000Z

    We report the room temperature operation of a quasi-ballistic InSb quantum well Hall sensor that exhibits a high frequency sensitivity of 560nT/?Hz at 20uA bias current. The device utilizes a partitioned buffer layer design that suppresses leakage currents through the mesa floor and can sustain large current densities.

  16. POLICY NAME 1ST READING BY

    E-Print Network [OSTI]

    Maxwell, Bruce D.

    POLICY NAME 1ST READING BY FACULTY SENATE APPROVED BY FACULTY SENATE POSTED FOR PUBLIC COMMENT APPROVED BY PRES or PROVOST ADOPTED FINAL POLICY DESTINATION Student Pregnancy Leave Pending Regents Professor (Version 1) 01/26/2011 04/27/2011 Regents Professor (Version 2) 04/12/2012 Revised Policy

  17. adolphus college st: Topics by E-print Network

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

    in Timed CSP Gavin Lowe St Hugh's College A thesis submitted for the degree of Doctor the Science and Engineering Research Council of the United Kingdom and a scholarship from St....

  18. Public Health Assessment Gopher State Ethanol, City of St. Paul

    E-Print Network [OSTI]

    Patzek, Tadeusz W.

    Public Health Assessment Gopher State Ethanol, City of St. Paul Ramsey County, Minnesota September with the Gopher State Ethanol, St. Paul, Ramsey County, Minnesota. It is based on a formal site evaluation....................................................................................................................... 3 Ethanol Production

  19. Laboratories for the 21st Century Agency Resources

    Broader source: Energy.gov [DOE]

    Many helpful resources are available to Federal agencies about Laboratories for the 21st Century (Labs21).

  20. Summary of Activities at the ST LOUIS NORTH COUNTY SITE

    E-Print Network [OSTI]

    US Army Corps of Engineers

    International Airport, which is now referred to as the St. Louis Airport Site (SLAPS). In 1966, the SLAPS wastes

  1. Microstructure and conductance-slope of InAs/GaSb tunnel diodes

    SciTech Connect (OSTI)

    Iutzi, Ryan M., E-mail: iutzi@mit.edu; Fitzgerald, Eugene A. [Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

    2014-06-21T23:59:59.000Z

    InAs/GaSb and similar materials systems have generated great interest as a heterojunction for tunnel field effect transistors (TFETs) due to favorable band alignment. However, little is currently understood about how such TFETs are affected by materials defects and nonidealities. We present measurements of the conductance slope for various InAs/GaSb heterojunctions via two-terminal electrical measurements, which removes three-terminal parasitics and enables direct study on the effect of microstructure on tunnelling. Using this, we can predict how subthreshold swings in TFETs can depend on microstructure. We also demonstrate growth and electrical characterization for structures grown by metalorganic chemical vapor deposition (MOCVD)—a generally more scalable process compared with molecular beam epitaxy (MBE). We determine that misfit dislocations and point defects near the interface can lead to energy states in the band-gap and local band bending that result in trap-assisted leakage routes and nonuniform band alignment across the junction area that lower the steepness of the conductance slope. Despite the small lattice mismatch, misfit dislocations still form in InAs on GaSb due to relaxation as a result of large strain from intermixed compositions. This can be circumvented by growing GaSb on InAs, straining the GaSb underlayer, or lowering the InAs growth temperature in the region of the interface. The conductance slope can also be improved by annealing the samples at higher temperatures, which we believe acts to annihilate point defects and average out major fluctuations in band alignment across the interface. Using a combination of these techniques, we can greatly improve the steepness of the conductance slope which could result in steeper subthreshold swings in TFETs in the future.

  2. Highly mismatched N-rich GaN{sub 1-x}Sb{sub x} films grown by low temperature molecular beam epitaxy

    SciTech Connect (OSTI)

    Yu, K. M.; Walukiewicz, W. [Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)] [Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States); Sarney, W. L.; Svensson, S. P. [US Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783 (United States)] [US Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783 (United States); Novikov, S. V.; Foxon, C. T. [School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)] [School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom); Detert, D.; Zhao, R. [Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States) [Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States); Department of Materials Science and Engineering, University of California, Berkeley, California 94720 (United States); Denlinger, J. D. [Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)] [Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States); Dubon, O. D. [Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States) [Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States); US Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783 (United States)

    2013-03-11T23:59:59.000Z

    We have grown N-rich, dilute Sb GaN{sub 1-x}Sb{sub x} alloys by low temperature molecular beam epitaxy. At low growth temperature of <100 Degree-Sign C the material loses crystallinity and becomes primarily amorphous with small crystallites of 2-5 nm at a Sb composition of >4 at. %. Despite the different microstructures found for GaN{sub 1-x}Sb{sub x} alloys with different composition, the absorption edge shifts continuously from 3.4 eV (GaN) to close to 1 eV for samples with Sb content >30 at. %. GaN{sub 1-x}Sb{sub x} alloys with less than 5 at. % Sb show sufficient bandgap reduction ({approx}2 eV), making them suitable for photoelectrochemical applications.

  3. NSTX Upgrade: ST research to accelerate fusion development

    E-Print Network [OSTI]

    parameter regimes to advance predictive capability - for ITER and beyond · Develop ST as fusion energy. Radiation-tolerant magnets, design (backup) 4 Culham (UK) UT Austin ORNLPPPL Example ST-FNSF concepts #12-up/ramp-up strategy Time Fast wave EC/EBW · 1 3MW 28GHz (with 2nd NBI) world-leading start-up/ramp-up for ST

  4. 1st TECCS meeting, 26th April 2007 Adsorption Refrigeration

    E-Print Network [OSTI]

    Davies, Christopher

    the refrigerant into a solid rather than ABsorbing it into a liquid. It is a discontinuous (batch) process #12;1st;1st TECCS meeting, 26th April 2007 Rotor and stator of ammonia circulator #12;1st TECCS meeting, 26th

  5. Temperature-dependent structural property and power factor of n type thermoelectric Bi{sub 0.90}Sb{sub 0.10} and Bi{sub 0.86}Sb{sub 0.14} alloys

    SciTech Connect (OSTI)

    Malik, K.; Das, Diptasikha [Department of Physics, University of Calcutta, 92 A P C Road, Kolkata 700 009 (India)] [Department of Physics, University of Calcutta, 92 A P C Road, Kolkata 700 009 (India); Bandyopadhyay, S.; Banerjee, Aritra, E-mail: arbphy@caluniv.ac.in [Department of Physics, University of Calcutta, 92 A P C Road, Kolkata 700 009 (India) [Department of Physics, University of Calcutta, 92 A P C Road, Kolkata 700 009 (India); Center for Research in Nanoscience and Nanotechnology, University of Calcutta, JD-2, Sector-III, Saltlake City, Kolkata 700 098 (India); Mandal, P.; Srihari, Velaga [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India)] [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India); Deb, A. K. [Department of Physics, Raiganj College (University College), Uttar Dinajpur 733 134 (India)] [Department of Physics, Raiganj College (University College), Uttar Dinajpur 733 134 (India)

    2013-12-09T23:59:59.000Z

    Thermal variation of structural property, linear thermal expansion coefficient (?), resistivity (?), thermopower (S), and power factor (PF) of polycrystalline Bi{sub 1-x}Sb{sub x} (x?=?0.10 and 0.14) samples are reported. Temperature-dependent powder diffraction experiments indicate that samples do not undergo any structural phase transition. Rietveld refinement technique has been used to perform detailed structural analysis. Temperature dependence of ? is found to be stronger for Bi{sub 0.90}Sb{sub 0.10}. Also, PF for direct band gap Bi{sub 0.90}Sb{sub 0.10} is higher as compared to that for indirect band gap Bi{sub 0.86}Sb{sub 0.14}. Role of electron-electron and electron-phonon scattering on ?, S, and PF has been discussed.

  6. Baseline risk assessment for exposure to contaminants at the St. Louis Site, St. Louis, Missouri

    SciTech Connect (OSTI)

    Not Available

    1993-11-01T23:59:59.000Z

    The St. Louis Site comprises three noncontiguous areas in and near St. Louis, Missouri: the St. Louis Downtown Site (SLDS), the St. Louis Airport Storage Site (SLAPS), and the Latty Avenue Properties. The main site of the Latty Avenue Properties includes the Hazelwood Interim Storage Site (HISS) and the Futura Coatings property, which are located at 9200 Latty Avenue. Contamination at the St. Louis Site is the result of uranium processing and disposal activities that took place from the 1940s through the 1970s. Uranium processing took place at the SLDS from 1942 through 1957. From the 1940s through the 1960s, SLAPS was used as a storage area for residues from the manufacturing operations at SLDS. The materials stored at SLAPS were bought by Continental Mining and Milling Company of Chicago, Illinois, in 1966, and moved to the HISS/Futura Coatings property at 9200 Latty Avenue. Vicinity properties became contaminated as a result of transport and movement of the contaminated material among SLDS, SLAPS, and the 9200 Latty Avenue property. This contamination led to the SLAPS, HISS, and Futura Coatings properties being placed on the National Priorities List (NPL) of the US Environmental Protection Agency (EPA). The US Department of Energy (DOE) is responsible for cleanup activities at the St. Louis Site under its Formerly Utilized Sites Remedial Action Program (FUSRAP). The primary goal of FUSRAP is the elimination of potential hazards to human health and the environment at former Manhattan Engineer District/Atomic Energy Commission (MED/AEC) sites so that, to the extent possible, these properties can be released for use without restrictions. To determine and establish cleanup goals for the St. Louis Site, DOE is currently preparing a remedial investigation/feasibility study-environmental impact statement (RI/FS-EIS). This baseline risk assessment (BRA) is a component of the process; it addresses potential risk to human health and the environment associated wi

  7. Impact of stress relaxation in GaAsSb cladding layers on quantum dot creation in InAs/GaAsSb structures grown on GaAs (001)

    SciTech Connect (OSTI)

    Bremner, S. P. [School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052 (Australia)] [School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052 (Australia); Ban, K.-Y.; Faleev, N. N.; Honsberg, C. B. [School of Electrical, Computer and Energy Engineering, Ira A. Fulton Schools of Engineering, Solar Power Lab, Arizona State University, Tempe, Arizona 85287 (United States)] [School of Electrical, Computer and Energy Engineering, Ira A. Fulton Schools of Engineering, Solar Power Lab, Arizona State University, Tempe, Arizona 85287 (United States); Smith, D. J. [Department of Physics, Arizona State University, Tempe, Arizona 85287 (United States)] [Department of Physics, Arizona State University, Tempe, Arizona 85287 (United States)

    2013-09-14T23:59:59.000Z

    We describe InAs quantum dot creation in InAs/GaAsSb barrier structures grown on GaAs (001) wafers by molecular beam epitaxy. The structures consist of 20-nm-thick GaAsSb barrier layers with Sb content of 8%, 13%, 15%, 16%, and 37% enclosing 2 monolayers of self-assembled InAs quantum dots. Transmission electron microscopy and X-ray diffraction results indicate the onset of relaxation of the GaAsSb layers at around 15% Sb content with intersected 60° dislocation semi-loops, and edge segments created within the volume of the epitaxial structures. 38% relaxation of initial elastic stress is seen for 37% Sb content, accompanied by the creation of a dense net of dislocations. The degradation of In surface migration by these dislocation trenches is so severe that quantum dot formation is completely suppressed. The results highlight the importance of understanding defect formation during stress relaxation for quantum dot structures particularly those with larger numbers of InAs quantum-dot layers, such as those proposed for realizing an intermediate band material.

  8. Oct 30th & 31st Clustering review

    E-Print Network [OSTI]

    Mitchell, Tom

    CLUSTERING Oct 30th & 31st Daegun Won #12;Outline ·Clustering review · K-means · GMM · Hierarchical clustering ·Examples #12;K-means & GMM #12;K-means · #12;K-means (2) ·Linear decision boundary · Voronoi #12;LET'S SEE SOME EXAMPLES! #12;K-means ­ seed choice? #12;Oops! #12;K-means ·What's the effect

  9. Solar Policy Environment: Minneapolis/St. Paul

    Broader source: Energy.gov [DOE]

    The cities of Minneapolis and St. Paul joined forces to implement a comprehensive approach to promoting “Solar in the Cities” including commercial and residential solar installations, technical training programs, and city and state policy review. The Cities are marshalling a wide array of expertise through strategic partnerships with Xcel Energy, Minnesota Dept. of Commerce, Minnesota Renewable Energy Society, Green Institute, freEner-g, Int’l Brotherhood of Electrical Workers, League of Minnesota cities, Neighborhood Energy Connection, and Century College.

  10. Nanostructured Ge{sub 2}Sb{sub 2}Te{sub 5} chalcogenide films produced by laser electrodispersion

    SciTech Connect (OSTI)

    Yavsin, D. A., E-mail: yavsin@mail.ioffe.ru; Kozhevin, V. M.; Gurevich, S. A.; Yakovlev, S. A.; Melekh, B. T.; Yagovkina, M. A.; Pevtsov, A. B. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

    2014-12-15T23:59:59.000Z

    Amorphous nanostructured films of a complex chalcogenide (Ge{sub 2}Sb{sub 2}Te{sub 5}) are produced by laser electrodispersion and their structural and electrical properties are studied. It is found that the characteristic size of Ge{sub 2}Sb{sub 2}Te{sub 5} nanoparticles in the structure of the films is 1.5–5 nm.

  11. Engineering evaluation/cost analysis for decontamination at the St. Louis Downtown Site, St. Louis, Missouri

    SciTech Connect (OSTI)

    Picel, M.H.; Hartmann, H.M.; Nimmagadda, M.R. (Argonne National Lab., IL (USA)); Williams, M.J. (Bechtel National, Inc., Oak Ridge, TN (USA))

    1991-05-01T23:59:59.000Z

    The US Department of Energy (DOE) is implementing a cleanup program for three groups of properties in the St. Louis, Missouri, area: the St. Louis Downtown Site (SLDS), the St. Louis Airport Site (SLAPS) and vicinity properties, and the Latty Avenue Properties, including the Hazelwood Interim Storage Site (HISS). The general location of these properties is shown in Figure 1; the properties are referred to collectively as the St. Louis Site. None of the properties are owned by DOE, but each property contains radioactive residues from federal uranium processing activities conducted at the SLDS during and after World War 2. The activities addressed in this environmental evaluation/cost analysis (EE/CA) report are being proposed as interim components of a comprehensive cleanup strategy for the St. Louis Site. As part of the Department's Formerly Utilized Sites Remedial Action Program (FUSRAP), DOE is proposing to conduct limited decontamination in support of proprietor-initiated activities at the SLDS, commonly referred to as the Mallinckrodt Chemical Works. The primary goal of FUSRAP activity at the SLDS is to eliminate potential environmental hazards associated with residual contamination resulting from the site's use for government-funded uranium processing activities. 17 refs., 3 figs., 5 tabs.

  12. Time resolved magneto-optical studies of ferromagnetic InMnSb films

    SciTech Connect (OSTI)

    Frazier, M.; Kini, R. N.; Nontapot, K.; Khodaparast, G. A. [Department of Physics, Virginia Tech, Blacksburg, Virginia 24061 (United States); Wojtowicz, T. [Institute of Physics, Polish Academy of Sciences 02-668 Warsaw (Poland); Liu, X.; Furdyna, J. K. [Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

    2008-02-11T23:59:59.000Z

    We report time resolved magneto-optical measurements in InMnSb ferromagnetic films with 2% and 2.8% Mn contents grown by low temperature molecular beam epitaxy. In order to probe a possible interaction between the spins of photoexcited carriers and the Mn ions, we measured spin dynamics before and after aligning the Mn ions by applying an external magnetic field at temperatures above and below the samples' Curie temperatures. We observed no significant temperature or magnetic field dependence in the relaxation times and attribute the observed dynamics entirely to the relaxation of photoexcited electrons in the conduction band where the s-d coupling with the localized Mn ions is significantly weaker compared to the p-d exchange coupling. We observed several differences in the optical response of our InMnSb samples which could have been influenced mainly by the samples' growth conditions.

  13. Synthesis and transport property of AgSbTe{sub 2} as a promising thermoelectric compound

    SciTech Connect (OSTI)

    Wang Heng; Li Jingfeng; Zou Minmin; Sui Tao [State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)

    2008-11-17T23:59:59.000Z

    Polycrystalline AgSbTe{sub 2} ternary compound materials with high phase purity were fabricated using a combined process of mechanical alloying and spark plasma sintering. It was found that stoichiometric AgSbTe{sub 2} is a promising composition for low-and-mediate temperature applications, whose ZT reaches 1.59 at 673 K, benefiting from its extremely low thermal conductivity (0.30 W/mK) in addition to its low electrical resistivity (<1.1x10{sup -4} {omega} m) and large positive Seebeck coefficient (260 {mu}V/K). On the other hand, deviating from this formula would lead to unstable phase structures and higher thermal conductivity, which make the samples less attractive as thermoelectric materials or components of thermoelectric systems.

  14. Doping Effects on the Thermoelectric Properties of Cu3SbSe4

    SciTech Connect (OSTI)

    Skoug, Eric [Michigan State University, East Lansing; Cain, Jeffrey D. [Michigan State University, East Lansing; Morelli, Donald [Michigan State University, East Lansing; Majsztrik, Paul W [ORNL; Kirkham, Melanie J [ORNL; Lara-Curzio, Edgar [ORNL

    2011-01-01T23:59:59.000Z

    We present the first systematic doping study on the ternary semiconductor Cu3SbSe 4 . We have developed a novel synthesis procedure that produces high-quality polycrystalline samples with hole concentrations an order of magnitude lower than have been reported for the undoped compound. The hole concentration can be increased by adding small amounts of either Ge or Sn on the Sb site. The power factor increases with increasing doping, reaching a maximum value of 16 W/cmK^2 . The thermoelectric properties are optimized for the 2% Sn doped compound which has ZT=0.72 at 630K, rivaling that of state-of-the-art thermoelectric materials in this temperature range.

  15. Abundance analysis of SB2 binary stars with HgMn primaries

    E-Print Network [OSTI]

    T. Ryabchikova

    1998-05-06T23:59:59.000Z

    We present a short review of the abundances in the atmospheres of SB2 systems with Mercury-Manganese (HgMn) primaries. Up to now a careful study has been made for both components of 8 out of 17 known SB2 binaries with orbital periods shorter than 100 days and mass ratio ranging from 1.08 to 2.2. For all eight systems we observe a lower Mn abundance in the secondary's atmospheres than in the primary's. Significant difference in the abundances is also found for some peculiar elements such as Ga, Xe, Pt. All secondary stars with effective temperatures less than 10000 K show abundance characteristics typical of the metallic-line stars.

  16. Height stabilization of GaSb/GaAs quantum dots by Al-rich capping

    SciTech Connect (OSTI)

    Smakman, E. P., E-mail: e.p.smakman@tue.nl; Koenraad, P. M. [Department of Applied Physics, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven (Netherlands); DeJarld, M.; Martin, A. J.; Millunchick, J. [Department of Material Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States); Luengo-Kovac, M.; Sih, V. [Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)

    2014-09-01T23:59:59.000Z

    GaSb quantum dots (QDs) in a GaAs matrix are investigated with cross-sectional scanning tunneling microscopy (X-STM) and photoluminescence (PL). We observe that Al-rich capping materials prevent destabilization of the nanostructures during the capping stage of the molecular beam epitaxy (MBE) growth process and thus preserves the QD height. However, the strain induced by the absence of destabilization causes many structural defects to appear around the preserved QDs. These defects originate from misfit dislocations near the GaSb/GaAs interface and extend into the capping layer as stacking faults. The lack of a red shift in the QD PL suggests that the preserved dots do not contribute to the emission spectra. We suggest that a better control over the emission wavelength and an increase of the PL intensity is attainable by growing smaller QDs with an Al-rich overgrowth.

  17. Optical nonlinear absorption characteristics of Sb{sub 2}Se{sub 3} nanoparticles

    SciTech Connect (OSTI)

    Muralikrishna, Molli, E-mail: muralikrishnamolli@sssihl.edu.in; Kiran, Aditha Sai, E-mail: muralikrishnamolli@sssihl.edu.in; Ravikanth, B., E-mail: muralikrishnamolli@sssihl.edu.in; Sowmendran, P., E-mail: muralikrishnamolli@sssihl.edu.in; Muthukumar, V. Sai, E-mail: muralikrishnamolli@sssihl.edu.in; Venkataramaniah, Kamisetti, E-mail: muralikrishnamolli@sssihl.edu.in [Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prasanthinilayam-515 134 (India)

    2014-04-24T23:59:59.000Z

    In this work, we report for the first time, the nonlinear optical absorption properties of antimony selenide (Sb{sub 2}Se{sub 3}) nanoparticles synthesized through solvothermal route. X-ray diffraction results revealed the crystalline nature of the nanoparticles. Electron microscopy studies revealed that the nanoparticles are in the range of 10 - 40 nm. Elemental analysis was performed using EDAX. By employing open aperture z-scan technique, we have evaluated the effective two-photon absorption coefficient of Sb{sub 2}Se{sub 3} nanoparticles to be 5e-10 m/W at 532 nm. These nanoparticles exhibit strong intensity dependent nonlinear optical absorption and hence could be considered to have optical power limiting applications in the visible range.

  18. Photoemission study of the electronic structure and charge density waves of Na2Ti2Sb2O

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

    Tan, S. Y.; Jiang, J.; Ye, Z. R.; Niu, X. H.; Song, Y.; Zhang, C. L.; Dai, P. C.; Xie, B. P.; Lai, X. C.; Feng, D. L.

    2015-04-30T23:59:59.000Z

    The electronic structure of Na2Ti2Sb2O single crystal is studied by photon energy and polarization dependent angle-resolved photoemission spectroscopy (ARPES). The obtained band structure and Fermi surface agree well with the band structure calculation of Na2Ti2Sb2O in the non-magnetic state, which indicates that there is no magnetic order in Na2Ti2Sb2O and the electronic correlation is weak. Polarization dependent ARPES results suggest the multi-band and multi-orbital nature of Na2Ti2Sb2O. Photon energy dependent ARPES results suggest that the electronic structure of Na2Ti2Sb2O is rather two-dimensional. Moreover, we find a density wave energy gap forms below the transition temperature and reaches 65 meV at 7 K, indicating that Na2Ti2Sb2O is likely a weakly correlated CDW material in the strong electron-phonon interaction regime. (author)

  19. Gain and tuning characteristics of mid-infrared InSb quantum dot diode lasers

    SciTech Connect (OSTI)

    Lu, Q.; Zhuang, Q.; Hayton, J.; Yin, M.; Krier, A. [Physics Department, Lancaster University, Lancaster LA1 4YB (United Kingdom)

    2014-07-21T23:59:59.000Z

    There have been relatively few reports of lasing from InSb quantum dots (QDs). In this work, type II InSb/InAs QD laser diodes emitting in the mid-infrared at 3.1??m have been demonstrated and characterized. The gain was determined to be 2.9?cm{sup ?1} per QD layer, and the waveguide loss was ?15?cm{sup ?1} at 4?K. Spontaneous emission measurements below threshold revealed a blue shift of the peak wavelength with increasing current, indicating filling of ground state heavy hole levels in the QDs. The characteristic temperature, T{sub 0}?=?101?K below 50?K, but decreased to 48?K at higher temperatures. The emission wavelength of these lasers showed first a blue shift followed by a red shift with increasing temperature. A hybrid structure was used to fabricate the laser by combining a liquid phase epitaxy grown p-InAs{sub 0.61}Sb{sub 0.13}P{sub 0.26} lower cladding layer and an upper n{sup +} InAs plasmon cladding layer which resulted in a maximum operating temperature (T{sub max}) of 120?K in pulsed mode, which is the highest reported to date.

  20. High-Temperature Order/Disorder Transition in the Thermoelectric Cu3SbSe3

    SciTech Connect (OSTI)

    Kirkham, Melanie J [ORNL; Majsztrik, Paul W [ORNL; Skoug, Eric [Michigan State University, East Lansing; Morelli, Donald [Michigan State University, East Lansing; Wang, Hsin [ORNL; Porter, Wallace D [ORNL; Payzant, E Andrew [ORNL; Lara-Curzio, Edgar [ORNL

    2011-01-01T23:59:59.000Z

    We report the results from an investigation into the structural evolution of a potential new thermoelectric material, Cu3SbSe3, as a function of temperature from 25 to 390 C. From high-temperature X-ray diffraction data, the refined lattice parameters were seen to change non-linearly, but continuously, with temperature, with an increased rate of thermal expansion in the a and b lattice parameters from around 125 C until around 175 C and negative thermal expansion in the c axis from around 100 C until around 175 C. Crystallographic charge flipping analysis indicated an increase in the disorder of the copper cations with temperature. This reversible order/disorder phase transition in Cu3SbSe3 affects the transport properties, as evidenced by thermal diffusivity measurements, which change from negative to positive slope at the transition temperature. This structural change in Cu3SbSe3 has implications for its potential use in thermoelectric generators.

  1. Raman Spectroscopy Determination of Hole Concentration in p-Type GaSb

    SciTech Connect (OSTI)

    Maslar JE, Hurst WS, Wang CA

    2007-04-05T23:59:59.000Z

    Room temperature p-type GaSb bulk coupled mode spectra were measured as a function of hole concentration. These spectra were obtained using an optical system based on 752.55 nm excitation in order to obtain more sensitivity to bulk GaSb coupled mode scattering than possible with visible wavelength excitation-based systems. A relatively simple spectral model for the electronic contribution to the dielectric function was evaluated for determination of hole concentration from the bulk coupled mode spectra. Optically-derived values for hole concentration were determined by minimizing the sum of the residuals squared between an experimental and simulated spectrum as a function of total hole concentration and a plasmon damping parameter. Hole concentrations obtained from the Raman spectroscopic measurements deviated from the values determined from single field Hall effect measurements that were corrected to account for two band conduction by {approx}20% to {approx}65%. These deviations were attributed to the limitations of the spectral model employed and uncertainties in GaSb materials properties.

  2. Health Physics in the 21st Century

    E-Print Network [OSTI]

    Bevelacqua, Joseph John

    2008-01-01T23:59:59.000Z

    Adopting a proactive approach and focusing on emerging radiation-generating technologies, Health Physics in the 21st Century meets the growing need for a presentation of the relevant radiological characteristics and hazards. As such, this monograph discusses those technologies that will affect the health physics and radiation protection profession over the decades to come. After an introductory overview, the second part of this book looks at fission and fusion energy, followed by a section devoted to accelerators, while the final main section deals with radiation on manned space missions.

  3. Solar for St. Paul | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33Frequently AskedEnergyIssues DOE's Nuclear EnergySmart Metersofand Energy Efficiencyfor St.

  4. 1994 SSRL 21st USERS MEETING

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isN Ground-State Decay2ApJ...399L..51G SSRL 21st USERS MEETING

  5. St Andrews Fuel Cells | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with formSoutheastern IL Elec Coop,Lanka-DLR Cooperation Jump to:Vel Bio DieselSt

  6. Green St Energy | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluating AGeothermal/Exploration <GlacialGoldenarticle isinEnergy,Green ShaktiSt

  7. An Efficient Algorithm for Computing Robust Minimum Capacity st Cuts

    E-Print Network [OSTI]

    Doug Altner

    2008-03-20T23:59:59.000Z

    Mar 20, 2008 ... In this paper, we present an efficient algorithm for computing minimum capacity s-t cuts under a polyhedral model of robustness. Our algorithm ...

  8. Laboratories for the 21st Century Case Studies: National Renewable...

    Office of Environmental Management (EM)

    Case Studies: National Renewable Energy Laboratory, Science and Technology Facility Laboratories for the 21st Century Case Studies: National Renewable Energy Laboratory, Science...

  9. Laboratories for the 21st Century: Best Practices Guide: Modeling...

    Energy Savers [EERE]

    bpmodeling508.pdf More Documents & Publications Laboratories for the 21st Century Case Studies: National Renewable Energy Laboratory, Science and Technology Facility Top...

  10. Laboratories for the 21st Century Case Studies

    Broader source: Energy.gov [DOE]

    These case studies feature examples of energy-efficient laboratories for the 21st century. The Featured Concepts Table outlines technologies covered in each case study.

  11. 21st Century Truck Partnership - Roadmap and Technical White...

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

    Appendix containing supporting information to the 21st Century Partnership's Roadmap and Technical White Papers (21CTP-003). 21ctproadmapappendix2007.pdf More Documents &...

  12. 21st Century Truck Partnership Roadmap Roadmap and Technical...

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

    that will reduce fuel usage and emissions while increasing heavy vehicle safety. 21ctproadmap2007.pdf More Documents & Publications Roadmap and Technical White Papers for 21st...

  13. Boise Inc. St. Helens Paper Mill Achieves Significant Fuel Savings...

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

    DOE energy assessment and implementing recommendations to improve the efficiency of its steam system. Boise Inc. St. Helens Paper Mill Achieves Significant Fuel Savings (May 2008)...

  14. Laboratories for the 21st Century Best Practices Guides

    Broader source: Energy.gov [DOE]

    Laboratories for the 21st Century best practices guides outline the design, construction, and operation of specific technologies that contribute to energy efficiency and sustainability. The guides...

  15. ,"Sault St Marie, MI Natural Gas Pipeline Exports to Canada ...

    U.S. Energy Information Administration (EIA) Indexed Site

    Sault St Marie, MI Natural Gas Pipeline Exports to Canada (Million Cubic Feet)" ,"Click worksheet name or tab at bottom for data" ,"Worksheet Name","Description"," Of...

  16. SELF HELPS ST. LUCIE RESIDENTS BEAT THE FLORIDA HEAT | Department...

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

    summer heat waves can send Floridians' utility bills soaring. St. Lucie County in the heart of Florida's Treasure Coast committed to helping homeowners reduce their rising...

  17. atomenergi norway 21st: Topics by E-print Network

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

    CENTURY Engineering Websites Summary: reinforcement. This problem is more serious in cold climate countries, where de-icing salts accelerate of these materials for the 21st...

  18. address 21st century: Topics by E-print Network

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

    CENTURY Engineering Websites Summary: reinforcement. This problem is more serious in cold climate countries, where de-icing salts accelerate of these materials for the 21st...

  19. 15-Minute Scheduling Begins October 21st - October 16, 2014

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

    CommitteesTeams Customer Training Interconnection Notices Rates Standards of Conduct Tariff TF Web Based Training Notice: 15-Minute Scheduling Begins October 21st Posted Date:...

  20. Job Creation and Energy Savings in St. Paul, Minnesota

    Broader source: Energy.gov [DOE]

    Check out this video where Mayor Chris Coleman explains how St. Paul is using grant money to create jobs while cutting waste and saving energy.

  1. Compound and Elemental Analysis At Mt St Helens Area (Shevenell...

    Open Energy Info (EERE)

    Goff (2000) Temporal Geochemical Variations In Volatile Emissions From Mount St Helens, Usa, 1980-1994 Additional References Retrieved from "http:en.openei.orgw...

  2. Compound and Elemental Analysis At Mt St Helens Area (Shevenell...

    Open Energy Info (EERE)

    Fraser Goff (1995) Evolution Of Hydrothermal Waters At Mount St Helens, Washington, Usa Additional References Retrieved from "http:en.openei.orgwindex.php?titleCompounda...

  3. St. Kitts and Nevis-Caribbean Community (CARICOM) Sustainable...

    Open Energy Info (EERE)

    Jump to: navigation, search Name St. Kitts and Nevis-Caribbean Community (CARICOM) Sustainable Energy Roadmap and Strategy AgencyCompany Organization Inter-American...

  4. Federal laboratories for the 21st century

    SciTech Connect (OSTI)

    Gover, J. [Sandia National Labs., Albuquerque, NM (United States); Huray, P.G. [Univ. of South Carolina, Columbia, SC (United States)

    1998-04-01T23:59:59.000Z

    Federal laboratories have successfully filled many roles for the public; however, as the 21st Century nears it is time to rethink and reevaluate how Federal laboratories can better support the public and identify new roles for this class of publicly-owned institutions. The productivity of the Federal laboratory system can be increased by making use of public outcome metrics, by benchmarking laboratories, by deploying innovative new governance models, by partnerships of Federal laboratories with universities and companies, and by accelerating the transition of federal laboratories and the agencies that own them into learning organizations. The authors must learn how government-owned laboratories in other countries serve their public. Taiwan`s government laboratory, Industrial Technology Research Institute, has been particularly successful in promoting economic growth. It is time to stop operating Federal laboratories as monopoly institutions; therefore, competition between Federal laboratories must be promoted. Additionally, Federal laboratories capable of addressing emerging 21st century public problems must be identified and given the challenge of serving the public in innovative new ways. Increased investment in case studies of particular programs at Federal laboratories and research on the public utility of a system of Federal laboratories could lead to increased productivity of laboratories. Elimination of risk-averse Federal laboratory and agency bureaucracies would also have dramatic impact on the productivity of the Federal laboratory system. Appropriately used, the US Federal laboratory system offers the US an innovative advantage over other nations.

  5. Sediment resuspension in Lake St. Clair

    SciTech Connect (OSTI)

    Hawley, N. (National Oceanic and Atmospheric Administration, Ann Arbor, MI (United States)); Lesht, B.M. (Argonne National Lab., IL (United States))

    1992-12-01T23:59:59.000Z

    Time-series measurements of water transparency, wave conditions, and current speed were made at several different sites in Lake St. Clair during five different 1-month periods in 1985 and 1986. Observed changes in suspended sediment concentration were modeled with a simple zero-dimensional, spatially averaged, mass balance model in which local bottom erosion was expressed as a linear function of the bottom shear stress. Estimates of the three parameters required by the model (particle settling velocity, resuspension concentration, and background suspended material concentration) are reasonably consistent for the various data sets, suggesting that the properties of the lake bottom do not change significantly through either space or time. The modeled settling velocities agree with the observed suspended particle size data and the erosion rates are comparable to laboratory results for freshwater sediments. The results show that a simple mass flux model can be used to model local sediment resuspension events in Lake St. Clair with reasonable accuracy. 23 refs., 5 figs., 3 tabs.

  6. Unusual magnetic hysteresis and the weakened transition behavior induced by Sn substitution in Mn{sub 3}SbN

    SciTech Connect (OSTI)

    Sun, Ying, E-mail: sunying@buaa.edu.cn [Center for Condensed Matter and Materials Physics, Department of Physics, Beihang University, Beijing 100191 (China); International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044 (Japan); Guo, Yanfeng; Li, Jun; Wang, Xia [Superconducting Properties Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044 (Japan); Tsujimoto, Yoshihiro [Materials Processing Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan); Wang, Cong [Center for Condensed Matter and Materials Physics, Department of Physics, Beihang University, Beijing 100191 (China); Feng, Hai L.; Sathish, Clastin I.; Yamaura, Kazunari, E-mail: yamaura.kazunari@nims.go.jp [Superconducting Properties Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044 (Japan); Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Hokkaido 060-0810 (Japan); Matsushita, Yoshitaka [Analysis Station, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047 (Japan)

    2014-01-28T23:59:59.000Z

    Substitution of Sb with Sn was achieved in ferrimagnetic antiperovskite Mn{sub 3}SbN. The experimental results indicate that with an increase in Sn concentration, the magnetization continuously decreases and the crystal structure of Mn{sub 3}Sb{sub 1-x}Sn{sub x}N changes from tetragonal to cubic phase at around x of 0.8. In the doping series, step-like anomaly in the isothermal magnetization was found and this behavior was highlighted at x?=?0.4. The anomaly could be attributed to the magnetic frustration, resulting from competition between the multiple spin configurations in the antiperovskite lattice. Meantime, H{sub c} of 18 kOe was observed at x?=?0.3, which is probably the highest among those of manganese antiperovskite materials reported so far. With increasing Sn content, the abrupt change of resistivity and the sharp peak of heat capacity in Mn{sub 3}SbN were gradually weakened. The crystal structure refinements indicate the weakened change at the magnetic transition is close related to the change of c/a ratio variation from tetragonal to cubic with Sn content. The results derived from this study indicate that the behavior of Mn{sub 3}Sb{sub 1-x}Sn{sub x}N could potentially enhance its scientific and technical applications, such as spin torque transfer and hard magnets.

  7. Thermal conductivity of Zn{sub 4{minus}x}Cd{sub x}Sb{sub 3} solid solutions

    SciTech Connect (OSTI)

    Caillat, T.; Borshchevsky, A.; Fleurial, J.P.

    1997-07-01T23:59:59.000Z

    {beta}-Zn{sub 4}Sb{sub 3} was recently identified at the Jet Propulsion Laboratory as a new high performance p-type thermoelectric material with a maximum dimensionless thermoelectric figure of merit ZT of 1.4 at a temperature of 673K. A usual approach, used for many state-of-the-art thermoelectric materials, to further improve ZT values is to alloy {beta}-Zn{sub 4}Sb{sub 3} with isostructural compounds because of the expected decrease in lattice thermal conductivity. The authors have grown Zn{sub 4{minus}x}Cd{sub x}Sb{sub 3} crystals with 0.2 {le} x < 1.2 and measured their thermal conductivity from 10 to 500K. The thermal conductivity values of Zn{sub 4{minus}x}Cd{sub x}Sb{sub 3} alloys are significantly lower than those measured for {beta}-Zn{sub 4}Sb{sub 3} and are comparable to its calculated minimum thermal conductivity. A strong atomic disorder is believed to be primarily at the origin of the very low thermal conductivity of these materials which are also fairly good electrical conductors and are therefore excellent candidates for thermoelectric applications.

  8. AN ECONOMIC EVALUATION OF THE ST. LAWRENCE RIVER-EASTERN

    E-Print Network [OSTI]

    AN ECONOMIC EVALUATION OF THE ST. LAWRENCE RIVER-EASTERN LAKE ONTARIO BASS FISHERY The St. Lawrence information on the economic importance of the bass fishery, considered by many to be one of the best smallmouth bass fisheries in the world. The economic value of this recreational fishery should be taken

  9. The Ozone Layer in the 21st Lead Authors

    E-Print Network [OSTI]

    Robock, Alan

    CHAPTER 6 The Ozone Layer in the 21st Century Lead Authors: G.E. Bodeker D.W. Waugh Coauthors: H;#12;CHAPTER 6 THE OZONE LAYER IN THE 21ST CENTURY Contents SCIENTIFIC SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 6.2 A FRAMEWORK FOR EVALUATING CHANGES IN OZONE ABUNDANCES

  10. BACHELOR OF St. F.X. Bachelor of Education Handbook

    E-Print Network [OSTI]

    BACHELOR OF EDUCATION HANDBOOK 2014-15 #12;St. F.X. Bachelor of Education Handbook Updated August 2014 2014-15 1 TABLE OF CONTENTS I. WELCOME TO THE ST. FRANCIS XAVIER UNIVERSITY BACHELOR OF EDUCATION ........................................2 B. School of Education Contacts....................2 II. FACULTY AND STAFF

  11. "Materials Education for the 21st Century Workforce"

    E-Print Network [OSTI]

    Rubloff, Gary W.

    "Materials Education for the 21st Century Workforce" Opening Remarks By Aris Christou This conference will help establish the educational needs in materials science for the 21st century and our program focuses on all aspects of materials education including K-12, undergraduate and graduate education

  12. Proc. 21st Winter Workshop on Nuclear Dynamics (2005) 000000

    E-Print Network [OSTI]

    Roth, Robert

    2005-01-01T23:59:59.000Z

    Proc. 21st Winter Workshop on Nuclear Dynamics (2005) 000­000 21st Winter Workshop on Nuclear Dynamics Breckenridge, Colorado, USA February 5­12, 2005 From the NN Interaction to Nuclear Structure present a novel approach for the treatment of realistic nucleon- nucleon interactions in nuclear many

  13. Trinity Health Ireland AMNCH TCD St James's Hospital

    E-Print Network [OSTI]

    O'Mahony, Donal E.

    Page1 Trinity Health Ireland AMNCH TCD St James's Hospital THE UNIVERSITY OF DUBLIN Trinity College / Trinity College 3 3. The Faculty of Health Sciences and School of Medicine 4 4. Adelaide and Meath. Trinity College, Dublin ­ Discipline of Clinical Medicine 10 at St. James's Hospital 7. Position

  14. Long wavelength, high gain InAsSb strained-layer superlattice photoconductive detectors

    DOE Patents [OSTI]

    Biefeld, Robert M. (Albuquerque, NM); Dawson, L. Ralph (Albuquerque, NM); Fritz, Ian J. (Albuquerque, NM); Kurtz, Steven R. (Albuquerque, NM); Zipperian, Thomas E. (Albuquerque, NM)

    1991-01-01T23:59:59.000Z

    A high gain photoconductive device for 8 to 12 .mu.m wavelength radiation including an active semiconductor region extending from a substrate to an exposed face, the region comprising a strained-layer superlattice of alternating layers of two different InAs.sub.1-x Sb.sub.x compounds having x>0.75. A pair of spaced electrodes are provided on the exposed face, and changes in 8 to 12 .mu.m radiation on the exposed face cause a large photoconductive gain between the spaced electrodes.

  15. Doping and pressure study of U sub 3 Sb sub 4 Pt sub 3

    SciTech Connect (OSTI)

    Canfield, P.C.; Lacerda, A.; Thompson, J.D.; Sparn, G.; Beyermann, W.P.; Hundley, M.F.; Fisk, Z.

    1991-01-01T23:59:59.000Z

    The effects of doping and pressure on the U{sub 3}Sb{sub 4}Pt{sub 3} system have been studied. Substitution of either trivalent Y or Lu for U causes significant changes in temperature dependence of the electrical resistance and magnitude of the linear coefficient of the specific heat, {gamma}. However, doping with tetravalent Th causes little change in {gamma}, even though it affects the electrical resistance in a manner similar to that seen in the cases of Lu and Y. Finally, the application of hydrostatic pressures up to 16.5 kbar causes no significant change in the electrical resistance. 10 refs., 4 figs.

  16. Unique nanostructures and enhanced thermoelectric performance of melt-spun BiSbTe alloys

    SciTech Connect (OSTI)

    Xie Wenjie [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (China); Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634-0978 (United States); Tang Xinfeng; Yan Yonggao; Zhang Qingjie [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (China); Tritt, Terry M. [Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634-0978 (United States)

    2009-03-09T23:59:59.000Z

    We report a melt spinning technique followed by a quick spark plasma sintering procedure to fabricate high-performance p-type Bi{sub 0.52}Sb{sub 1.48}Te{sub 3} bulk material with unique microstructures. The microstructures consist of nanocrystalline domains embedded in amorphous matrix and 5-15 nm nanocrystals with coherent grain boundary. The significantly reduced thermal conductivity leads to a state-of-the-art dimensionless figure of merit ZT{approx}1.56 at 300 K, more than 50% improvement of that of the commercial Bi{sub 2}Te{sub 3} ingot materials.

  17. Angular dependence of metamagnetic transitions in DyAgSb2

    E-Print Network [OSTI]

    Myers, KD; Canfield, PC; Kalatsky, VA; Pokrovsky, Valery L.

    1999-01-01T23:59:59.000Z

    -dependent critical fields. Recent theoretical work2 has analyzed these data within the frame- PRB 590163-1829/99/59~2!/1121~8!/$15.00 c transitions in DyAgSb2 P. C. Canfield , Iowa State University, Ames, Iowa 50010 V. L. Pokrovsky , College Station, Texas...! are magnetic isotherm for the sample cooled to 2 K from 12 K in a 19.7 kOe field. Note: the plateau at 19.7 kOe is stabilized by field cool- PRB 59, AND POKROVSKY ing. Inset: M (T) in 19.7 kOe for increasing ~s! and decreasing temperature ~j!. O given...

  18. Growth of an {alpha}-Sn film on an InSb(111) A-(2x2) surface

    SciTech Connect (OSTI)

    Kondo, Daiyu; Sakamoto, Kazuyuki; Shima, Masahide; Takeyama, Wakaba [Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578 (Japan); Nakamura, Kenya; Ono, Kanta; Oshima, Masaharu [Department of Applied Chemistry, Graduate School of Engineering, University of Tokyo, Tokyo 113-0033 (Japan); Kasukabe, Yoshitaka [Department of Electronic Engineering/International Student Center, Tohoku University, Sendai 980-8578 (Japan)

    2004-12-15T23:59:59.000Z

    We have investigated the initial growth process of {alpha}-Sn films on the In-terminated InSb(111)A-(2x2) surface using low-energy electron diffraction (LEED) and high-resolution core-level photoelectron spectroscopy. Taking the LEED observation and the Sn coverage-dependent integrated intensities of the In 4d, Sb 4d, and Sn 4d core-level spectra into account, we conclude that the {alpha}-Sn film grows epitaxially by a bilayer mode and that there is no interdiffusion of the substrate atoms as suggested in the literature. Furthermore, the coverage-dependent In 4d and Sn 4d core levels indicate that the In vacancy site of InSb(111)A-(2x2) surface is not the preferable Sn absorption site.

  19. Electrical and microstructure analysis of nickel-based low-resistance ohmic contacts to n-GaSb

    SciTech Connect (OSTI)

    Rahimi, Nassim, E-mail: nrahimi@unm.edu; Aragon, Andrew A.; Romero, Orlando S.; Shima, Darryl M.; Rotter, Thomas J.; Mukherjee, Sayan D.; Balakrishnan, Ganesh [Center for High Technology Materials, University of New Mexico, Albuquerque, New Mexico 87106 (United States); Lester, Luke F. [Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, 302 Whittemore, Blacksburg, Virginia, 24061 (United States)

    2013-12-01T23:59:59.000Z

    Ultra low resistance ohmic contacts are fabricated on n-GaSb grown by molecular beam epitaxy. Different doping concentrations and n-GaSb thicknesses are studied to understand the tunneling transport mechanism between the metal contacts and the semiconductor. Different contact metallization and anneal process windows are investigated to achieve optimal penetration depth of Au in GaSb for low resistances. The fabrication, electrical characterization, and microstructure analysis of the metal-semiconductor interfaces created during ohmic contact formation are discussed. The characterization techniques include cross-sectional transmission electron microscopy and energy dispersive spectroscopy. Specific transfer resistances down to 0.1 ??mm and specific contact resistances of 1 × 10{sup ?6} ??cm{sup 2} are observed.

  20. Wafer Bonding and Epitaxial Transfer of GaSb-based Epitaxy to GaAs for Monolithic Interconnection of Thermophotovoltaic Devices

    SciTech Connect (OSTI)

    C.A. Wang; D.A. Shiau; P.G. Murphy; P.W. O'brien; R.K. Huang; M.K. Connors; A.C. Anderson; D. Donetsky; S. Anikeev; G. Belenky; D.M. Depoy; G. Nichols

    2003-06-16T23:59:59.000Z

    GaInAsSb/AlGaAsSb/InAsSb/GaSb epitaxial layers were bonded to semi-insulating GaAs handle wafers with SiO{sub x}/Ti/Au as the adhesion layer for monolithic interconnection of thermophotovoltaic (TPV) devices. Epitaxial transfer was completed by removal of the GaSb substrate, GaSb buffer, and InAsSb etch-stop layer by selective chemical etching. The SiO{sub x}/TiAu provides not only electrical isolation, but also high reflectivity and is used as an internal back-surface reflector. Characterization of wafer-bonded epitaxy by high-resolution x-ray diffraction and time-decay photoluminescence indicates minimal residual stress and enhancement in optical quality. 0.54-eV GaInAsSb cells were fabricated and monolithically interconnected in series. A 10-junction device exhibited linear voltage building with an open-circuit voltage of 1.8 V.

  1. Micro-Raman spectroscopy of mechanically exfoliated few-quintuple layers of Bi2Te3, Bi2Se3, and Sb2Te3 materials

    E-Print Network [OSTI]

    Micro-Raman spectroscopy of mechanically exfoliated few-quintuple layers of Bi2Te3, Bi2Se3, and Sb2-like" exfoliated few-quintuple layers of Bi2Te3, Bi2Se3, and Sb2Te3. It is found that crystal symmetry breaking

  2. Structural phase transitions on the nanoscale: The crucial pattern in the phase-change materials Ge2Sb2Te5 and GeTe

    E-Print Network [OSTI]

    Structural phase transitions on the nanoscale: The crucial pattern in the phase-change materials Ge2Sb2Te5 and GeTe J. Akola1,2 and R. O. Jones1 1Institut für Festkörperforschung, Forschungszentrum to characterize the amorphous structure of the prototype materials Ge2Sb2Te5 and GeTe. In both, there is long

  3. Synthesis and thermoelectric properties of Ce(Ru0.67Rh0.33)4Sb12. Geoff D. Staneff1

    E-Print Network [OSTI]

    Asimow, Paul D.

    Synthesis and thermoelectric properties of Ce(Ru0.67Rh0.33)4Sb12. Geoff D. Staneff1 , Paul D compositions show promise for thermoelectric applications. Current work was undertaken with a nominal composition of Ce(Ru0.67Rh0.33)4Sb12 to experimentally verify its potential as an n-type thermoelectric

  4. St. Louis Airport site environmental report for calendar year 1989, St. Louis, Missouri

    SciTech Connect (OSTI)

    Not Available

    1990-05-01T23:59:59.000Z

    The environmental monitoring program, which began in 1984, continued during 1989 at the St. Louis Airport Site (SLAPS) in St. Louis County, Missouri. SLAPS and its vicinity properties, including ditches north and south of the site, were designated for cleanup as part of the Formerly Utilized Sites Remedial Action Program (FUSRAP), a United States Department of Energy (DOE) program to identify and decontaminate or otherwise control sites where residual radioactive material remains from the early years of the nation's atomic energy program. The monitoring program at SLAPS measures radon concentrations in air; external gamma dose rates; and uranium, thorium, and radium concentrations in surface water, groundwater, and sediment. Additionally, several nonradiological parameters are measured in groundwater. To assess the potential effect of SLAPS on public health, the potential radiation dose was estimated for a hypothetical maximally exposed individual. This report presents the findings of the environmental monitoring program conducted at the St. Louis Airport Site (SLAPS) during calendar year 1989. 19 refs., 13 figs., 14 tabs.

  5. Design and fabrication of 6.1-.ANG. family semiconductor devices using semi-insulating A1Sb substrate

    DOE Patents [OSTI]

    Sherohman, John W. (Livermore, CA); Coombs, III, Arthur W. (Patterson, CA); Yee, Jick Hong (Livermore, CA); Wu, Kuang Jen J. (Cupertino, CA)

    2007-05-29T23:59:59.000Z

    For the first time, an aluminum antimonide (AlSb) single crystal substrate is utilized to lattice-match to overlying semiconductor layers. The AlSb substrate establishes a new design and fabrication approach to construct high-speed, low-power electronic devices while establishing inter-device isolation. Such lattice matching between the substrate and overlying semiconductor layers minimizes the formation of defects, such as threaded dislocations, which can decrease the production yield and operational life-time of 6.1-.ANG. family heterostructure devices.

  6. Structural investigation on Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses using x-ray photoelectron spectra

    SciTech Connect (OSTI)

    Wei, Wen-Hou [Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Department of Applied Physics, Chongqing University, Chongqing 401331 (China); Xiang, Shen [College of Information Science and Engineering, Ningbo University, Ningbo 315211 (China); Xu, Si-Wei; Wang, Rong-Ping, E-mail: rongping.wang@anu.edu.au [Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Fang, Liang [Department of Applied Physics, Chongqing University, Chongqing 401331 (China)

    2014-05-14T23:59:59.000Z

    The structure of Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses (x?=?7.5, 10, 15, 20, 25, 27.5, 30, and 32.5 at. %) has been investigated by x-ray photoelectron spectroscopy (XPS). Different structural units have been extracted and characterized by decomposing XPS core level spectra, the evolution of the relative concentration of each structural unit indicates that, the relative contributions of Se-trimers and Se-Se-Ge(Sb) structure decrease with increasing Ge content until they become zero at chemically stoichiometric glasses of Ge{sub 25}Sb{sub 10}Se{sub 65}, and then the homopolar bonds like Ge-Ge and Sb-Sb begin to appear in the spectra. Increase of homopolar bonds will extend band-tails into the gap and narrow the optical band gap. Thus, the glass with a stoichiometric composition generally has fewer defective bonds and larger optical bandgap.

  7. Atomic layer deposition of Al{sub 2}O{sub 3} on GaSb using in situ hydrogen plasma exposure

    SciTech Connect (OSTI)

    Ruppalt, Laura B.; Cleveland, Erin R.; Champlain, James G.; Prokes, Sharka M.; Brad Boos, J.; Park, Doewon; Bennett, Brian R. [Electronics Science and Technology Division, Naval Research Laboratory, Washington, DC 20375 (United States)

    2012-12-03T23:59:59.000Z

    In this report, we study the effectiveness of hydrogen plasma surface treatments for improving the electrical properties of GaSb/Al{sub 2}O{sub 3} interfaces. Prior to atomic layer deposition of an Al{sub 2}O{sub 3} dielectric, p-GaSb surfaces were exposed to hydrogen plasmas in situ, with varying plasma powers, exposure times, and substrate temperatures. Good electrical interfaces, as indicated by capacitance-voltage measurements, were obtained using higher plasma powers, longer exposure times, and increasing substrate temperatures up to 250 Degree-Sign C. X-ray photoelectron spectroscopy reveals that the most effective treatments result in decreased SbO{sub x}, decreased Sb, and increased GaO{sub x} content at the interface. This in situ hydrogen plasma surface preparation improves the semiconductor/insulator electrical interface without the use of wet chemical pretreatments and is a promising approach for enhancing the performance of Sb-based devices.

  8. Room temperature performance of mid-wavelength infrared InAsSb nBn detectors

    SciTech Connect (OSTI)

    Soibel, Alexander; Hill, Cory J.; Keo, Sam A.; Hoglund, Linda; Rosenberg, Robert; Kowalczyk, Robert; Khoshakhlagh, Arezou; Fisher, Anita; Ting, David Z.-Y.; Gunapala, Sarath D. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, California 91030 (United States)

    2014-07-14T23:59:59.000Z

    In this work, we investigate the high temperature performance of mid-wavelength infrared InAsSb-AlAsSb nBn detectors with cut-off wavelengths near 4.5??m. The quantum efficiency of these devices is 35% without antireflection coatings and does not change with temperature in the 77–325?K temperature range, indicating potential for room temperature operation. The current generation of nBn detectors shows an increase of operational bias with temperature, which is attributed to a shift in the Fermi energy level in the absorber. Analysis of the device performance shows that operational bias and quantum efficiency of these detectors can be further improved. The device dark current stays diffusion limited in the 150?K–325?K temperature range and becomes dominated by generation-recombination processes at lower temperatures. Detector detectivities are D*(?)?=?1?×?10{sup 9} (cm Hz{sup 0.5}/W) at T?=?300?K and D*(?)?=?5?×?10{sup 9} (cm Hz{sup 0.5}/W) at T?=?250?K, which is easily achievable with a one stage TE cooler.

  9. Decay heat removal during SB LOCA with loss of all feedwater

    SciTech Connect (OSTI)

    Prosek, A.; Mavko, B.; Petelin, S. [Jozef Stefan Institute, Ljubljana (Slovenia). Reactor Engineering Division

    1994-12-31T23:59:59.000Z

    The aim of this research was to investigate decay heat removal during SB LOCA with simultaneous loss of all feedwater in a two loop PWR plant. Following a SB LOCA, the major concern is to keep the core covered assuring decay heat removal from the core thereby preventing cladding damage. Analysis was performed based on the data for Krsko NPP in Slovenia. The spectrum of break sizes in the cold leg was analyzed using the RELAP5/MOD2 code. The results indicate that when the break diameter is lower than 2.5 cm, the steam generators will dry out and the primary side bleed and feed procedure should be initiated. For break diameters between 2.5 cm to 5.1 cm the decay heat can be removed by the break flow and by relieving the steam through the steam generator relief valves. For break diameters greater than 5.1 cm the break flow is sufficient to remove all dissipated decay heat.

  10. SeZnSb alloy and its nano tubes, graphene composites properties

    SciTech Connect (OSTI)

    Singh, Abhay Kumar [Department of Physics, Indian Institute of Physics, Bangalore-560012 (India)

    2013-04-15T23:59:59.000Z

    Composite can alter the individual element physical property, could be useful to define the specific use of the material. Therefore, work demonstrates the synthesis of a new composition Se{sub 96}-Zn{sub 2}-Sb{sub 2} and its composites with 0.05% multi-walled carbon nano tubes and 0.05% bilayer graphene, in the glassy form. The diffused amorphous structure of the multi walled carbon nano tubes and bilayer gaphene in the Se{sub 96}-Zn{sub 2}-Sb{sub 2} alloy have been analyzed by using the Raman, X-ray photoluminescence spectroscopy, Furrier transmission infrared spectra, photoluminescence, UV/visible absorption spectroscopic measurements. The diffused prime Raman bands (G and D) have been appeared for the multi walled carbon nano tubes and graphene composites, while the X-ray photoluminescence core energy levels peak shifts have been observed for the composite materials. Subsequently the photoluminescence property at room temperature and a drastic enhancement (upto 80%) in infrared transmission percentage has been obtained for the bilayer graphene composite, along with optical energy band gaps for these materials have been evaluated 1.37, 1.39 and 1.41 eV.

  11. Effect on Sb on the Properties of GaInP Top Cells: Preprint

    SciTech Connect (OSTI)

    Olson, J. M.; McMahon, W. E.; Kurtz, S.

    2006-05-01T23:59:59.000Z

    It is well known that the efficiency of GaInP/GaAs tandem solar cells is limited by the band gap of the GaInP top cell, which, in turn, is determined by the degree of compositional ordering in GaInP base layer. Attempts to raise the band gap by the addition of Al to the top cell have met with limited success due to the strong affinity between Al and oxygen. Here we investigate a different approach. It has been shown that the presence of antimony on the surface of GaInP during its growth suppresses the ordering process and increases the band gap. In this paper, we study the effects of Sb on the properties of GaInP top cells. We show that, in addition to raising the band gap of GaInP, it also increases the incorporation of Zn and changes the relative incorporation of Ga and In. These effects depend strongly on the substrate orientation, growth temperature and rate, and the Sb/P ratio in the gas phase. We show that the band gap of the GaInP top cell (and the Voc) can be increased without reducing the minority carrier collection efficiency. The implications of these results are presented and discussed.

  12. Electrodeposition of InSb branched nanowires: Controlled growth with structurally tailored properties

    SciTech Connect (OSTI)

    Das, Suprem R.; Mohammad, Asaduzzaman; Janes, David B., E-mail: janes@ecn.purdue.edu [School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Akatay, Cem [School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Khan, Mohammad Ryyan; Alam, Muhammad A. [School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Maeda, Kosuke [Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta–cho, Midori-ku, Yokohama 226-8502 (Japan); Advanced Device Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Deacon, Russell S.; Ishibashi, Koji [Advanced Device Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Chen, Yong P. [School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 (United States); Sands, Timothy D. [School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States)

    2014-08-28T23:59:59.000Z

    In this article, electrodeposition method is used to demonstrate growth of InSb nanowire (NW) arrays with hierarchical branched structures and complex morphology at room temperature using an all-solution, catalyst-free technique. A gold coated, porous anodic alumina membrane provided the template for the branched NWs. The NWs have a hierarchical branched structure, with three nominal regions: a “trunk” (average diameter of 150?nm), large branches (average diameter of 100?nm), and small branches (average diameter of sub-10?nm to sub-20?nm). The structural properties of the branched NWs were studied using scanning transmission electron microscopy, transmission electron microscopy, scanning electron microscopy, x-ray diffraction, energy dispersive x-ray spectroscopy, and Raman spectroscopy. In the as-grown state, the small branches of InSb NWs were crystalline, but the trunk regions were mostly nanocrystalline with an amorphous boundary. Post-annealing of NWs at 420?°C in argon produced single crystalline structures along ?311? directions for the branches and along ?111? for the trunks. Based on the high crystallinity and tailored structure in this branched NW array, the effective refractive index allows us to achieve excellent antireflection properties signifying its technological usefulness for photon management and energy harvesting.

  13. Nepheline Formation Study for Sludge Batch 4 (SB4): Phase 1 Experimental Results

    SciTech Connect (OSTI)

    Peeler, D. K.; Edwards, T. B.; Reamer, I.A.; Workman, R. J.

    2005-09-30T23:59:59.000Z

    Although it is well known that the addition of Al{sub 2}O{sub 3} to borosilicate glasses enhances the durability of the waste form (through creation of network-forming tetrahedral Na+-[AlO{sub 4/2}]{sup -} pairs), the combination of high Al{sub 2}O{sub 3} and Na{sub 2}O can lead to the formation of nepheline (NaAlSiO{sub 4})--which can negatively impact durability. Given the projected high concentration of Al{sub 2}O{sub 3} in SB4 (Lilliston 2005) and the potential use of a high Na{sub 2}O based frit to improve melt rate and a high Na{sub 2}O sludge due to settling problems, the potential formation of nepheline in various SB4 systems continues to be assessed. Twelve SB4-based glasses were fabricated and their durabilities (via the Product Consistency Test [PCT]) measured to assess the potential for nepheline formation and its potential negative impact on durability. In terms of ''acceptability'', the results indicate that all of the study glasses produced are acceptable with respect to durability as defined by the PCT (normalized boron release values for all nepheline (NEPH) glasses were much lower than that of the Environmental Assessment (EA) glass (16.695 g/L)). The most durable glass is NEPH-04 (quenched) with a normalized boron release (NL [B]) of 0.61 g/L, while the least durable glass is NEPH-01 centerline canister cooled (ccc) with an NL [B] of 2.47 g/L (based on the measured composition). In terms of predictability, most of the study glasses are predictable by the {Delta}G{sub p} model. Those that are not predictable (i.e., they fall outside of the prediction limits) actually fall below the prediction interval (i.e., they are over predicted by the model) suggesting the model is conservative. The Phase 1 PCT results suggest that for those glasses prone to nepheline formation (using the 0.62 value developed by Li et al. (2003) as a guide), a statistically significant difference in PCT response was observed for the two heat treatments but the impact on durability was of little or no practical concern. When one couples the PCT responses with the X-Ray Diffraction (XRD) results and/or visual observations, one could conclude that the formation of nepheline in these glasses does have a negative impact on durability. However, that impact may be of statistical significance, but the practical impact may not be sufficient to avoid a specific candidate frit for the SB4 glass system. The results of this study not only suggest that the 0.62 value appears to be a reasonable guide to monitor sludge--frit systems with respect to potential nepheline formation, but also that the impact of nepheline, although statistically significant, has little or no practical impact in the SB4 system to durability as measured by the PCT. This latter statement must be qualified to some extent given only two glasses were selected which were actually ''prone to nepheline formation'' based on this general guide and the relatively volume % of nepheline formed based on XRD results ({approx} 0.5 vol%). If the presence of nepheline has no appreciable, adverse impact on durability for the recently revised SB4 systems, then as decisions regarding the viability of the SB4 options and the down select of candidate frits are pursued, little weight will be given to minimizing the likelihood of nepheline and the decisions will be dominated by waste throughput criteria. That is, the frit selection process will not have to consider the impact of nepheline on the ultimate durability of the product and can focus on recommending a frit that when coupled with the sludge can be processed over a waste loading (WL) interval of interest to the Defense Waste Processing Facility (DWPF) with melt rates meeting production expectations.

  14. Science for the 21st Century

    SciTech Connect (OSTI)

    Not Available

    2004-07-01T23:59:59.000Z

    The Federal government plays a key role in supporting the country's science infrastructure, a national treasure, and scientific research, an investment in our future. Scientific discoveries transform the way we think about our universe and ourselves, from the vastness of space to molecular-level biology. In innovations such as drugs derived through biotechnology and new communications technologies we see constant evidence of the power of science to improve lives and address national challenges. We had not yet learned to fly at the dawn of the 20th century, and could not have imagined the amazing 20th century inventions that we now take for granted. As we move into the 21st century, we eagerly anticipate new insights, discoveries, and technologies that will inspire and enrich us for many decades to come. This report presents the critical responsibilities of our Federal science enterprise and the actions taken by the Federal research agencies, through the National Science and Technology Council, to align our programs with scientific opportunity and with national needs. The many examples show how our science enterprise has responded to the President's priorities for homeland and national security, economic growth, health research, and the environment. In addition, we show how the science agencies work together to set priorities; coordinate related research programs; leverage investments to promote discovery, translate science into national benefits, and sustain the national research enterprise; and promote excellence in math and science education and work force development.

  15. Transition threshold in Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses

    SciTech Connect (OSTI)

    Wei, Wen-Hou [Department of Applied Physics, Chongqing University, Chongqing 401331 (China); Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia); Fang, Liang, E-mail: lfang@cqu.edu.cn [Department of Applied Physics, Chongqing University, Chongqing 401331 (China); Shen, Xiang [Laboratory of Infrared Material and Devices, Advanced Technology Research Institute, Ningbo University, Ningbo 315211 (China); Wang, Rong-Ping [Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Laser Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200 (Australia)

    2014-03-21T23:59:59.000Z

    Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses with Ge content from 7.5 to 32.5?at.?% have been prepared by melt-quench technique, and the physical parameters including glass transition temperature (T{sub g}), density (?), compactness (C), shear elastic moduli (C{sub s}), compression elastic moduli (C{sub c}), refractive index (n), and optical bandgap (E{sub g}) have been investigated. While all these physical parameters show threshold behavior in the glass with a chemically stoichiometric composition. Raman spectra analysis also indicates that, with increasing Ge content, Se-chains or rings gradually disappear until all Se-atoms are consumed in the glass with a chemically stoichiometric composition. With further increasing Ge content, homopolar Ge-Ge and Sb-Sb bonds are formed and the chemical order in the glasses is violated. The threshold behavior of the physical properties in the Ge{sub x}Sb{sub 10}Se{sub 90?x} glasses can be traced to demixing of networks above the chemically stoichiometric composition.

  16. Solubility study of Yb in n-type skutterudites YbxCo4Sb12 and their enhanced thermoelectric properties

    E-Print Network [OSTI]

    Yang, J.

    The solubility of Yb in Yb[subscript x]Co[subscript 4]Sb[subscript 12 was reported to be 0.19 in bulk skutterudites made by melting and slow cooling method. Surprisingly we increased x close to 0.5 by a special sample ...

  17. Theoretical performance of very long wavelength InAs/InxGa1 xSb superlattice based infrared detectors

    E-Print Network [OSTI]

    Flatte, Michael E.

    , and satellite-based surveillance. Present day infrared detection technology based on bulk Hg1 xCdxTe MCT alloys is facing significant challenges in this spectral region due to i a sensitive dependence of the energy gap tunneling currents. An alter- native infrared system, based on InAs/InxGa1 xSb superlat- tices SLs , shows

  18. Crystallization of Ge2Sb2Te5 nanometric phase change material clusters made by gas-phase condensation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Crystallization of Ge2Sb2Te5 nanometric phase change material clusters made by gas- phase=pdfcov Published by the AIP Publishing Articles you may be interested in Nanoscale nuclei in phase change materials phase change material clusters made by gas-phase condensation G. E. Ghezzi,1,2 R. Morel,3 A. Brenac,3 N

  19. Mapping two-way grids onto free-form surfaces P. Winslow S. Pellegrino S.B. Sharma

    E-Print Network [OSTI]

    Pellegrino, Sergio

    Mapping two-way grids onto free-form surfaces P. Winslow S. Pellegrino S.B. Sharma Department, however existing techniques focus on relatively simple geometrical rules and algorithms to map a grid onto in the Millennium Dome, London . Use of a grid structure, consisting of a lattice of rods (see Figure 1) may be more

  20. St. Louis County- Residential Energy Efficiency Loan Program

    Broader source: Energy.gov [DOE]

    St. Louis County SAVES offers loans to residents for energy efficiency improvements in owner-occupied, single-family homes. Loans are available for a variety of energy-efficiency improvements, as...

  1. St. Augustinegrass Warm-season turfgrass. Prefers full sun, but

    E-Print Network [OSTI]

    Ishida, Yuko

    St. Augustinegrass Warm-season turfgrass. Prefers full sun, but has a high tolerance for shade-season grass. It does best in full sun and high temperatures. Goes dormant and turns brown in winter. Very

  2. 1st Women-VetsinTech Hackathon @ Facebook

    Broader source: Energy.gov [DOE]

    The 1st EVER Women-VetsinTech hackathon @ Facebook will be a shortened version of the VetsinTech popular weekend event but will be action packed with goal of getting to a MVP (minimum viable...

  3. State Waste Discharge Permit ST-4502 Implementation Plan

    SciTech Connect (OSTI)

    BROWN, M.J.; LECLAIR, M.D.

    2000-09-27T23:59:59.000Z

    Plan has been developed to demonstrate compliance with regulatory requirements set forth in Permit ST-3502 and as a line management tool for use in maintaining configuration control of permit as well as documentation used to implement permit requirements.

  4. Vehicle Technologies Office: 21st Century Truck Partners

    Broader source: Energy.gov [DOE]

    The 21st Century Truck Partnership is an industry-government collaboration among heavy-duty engine manufacturers, medium-duty and heavy-duty truck and bus manufacturers, heavy-duty hybrid...

  5. EECBG Success Story: St. Louis Launches Plan for More Sustainable...

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

    Using money from the Energy Efficiency Block Grant Program, St. Louis installed new LED fixtures in the City Hall parking structure. The new lights deliver more useful light and...

  6. St. Lucie County- Solar and Energy Loan Fund (SELF)

    Broader source: Energy.gov [DOE]

    St. Lucie County has partnered with local financial institutions and community leaders to establish the non-profit Solar and Energy Loan Fund (SELF), which will administer a low-interest loan...

  7. EMSL Quarterly Highlights Report: 1st Quarter, Fiscal Year 2009

    SciTech Connect (OSTI)

    Showalter, Mary Ann; Kathmann, Loel E.; Manke, Kristin L.

    2009-02-02T23:59:59.000Z

    The EMSL Quarterly Highlights Report covers the science, staff and user recognition, and publication activities that occurred during the 1st quarter (October 2008 - December 2008) of Fiscal Year 2009.

  8. ,"St. Clair, MI Natural Gas Pipeline Exports to Canada (MMcf...

    U.S. Energy Information Administration (EIA) Indexed Site

    Exports to Canada (MMcf)" ,"Click worksheet name or tab at bottom for data" ,"Worksheet Name","Description"," Of Series","Frequency","Latest Data for" ,"Data 1","St. Clair, MI...

  9. ,"St. Clair, MI Natural Gas Pipeline Imports From Canada (MMcf...

    U.S. Energy Information Administration (EIA) Indexed Site

    Imports From Canada (MMcf)" ,"Click worksheet name or tab at bottom for data" ,"Worksheet Name","Description"," Of Series","Frequency","Latest Data for" ,"Data 1","St. Clair, MI...

  10. WIND EFFECTS ON CHEMICAL SPILL IN ST ANDREW BAY SYSTEM

    E-Print Network [OSTI]

    Chu, Peter C.

    WIND EFFECTS ON CHEMICAL SPILL IN ST ANDREW BAY SYSTEM PETER C. CHU, PATRICE PAULY Naval Can easily reach 20 m/s and more during hurricane events #12;Water Quality Management and Analysis

  11. Ir. Charles Mussche 8 Spruce St, New York

    E-Print Network [OSTI]

    Ir. Charles Mussche 8 Spruce St, New York 10038 NYC Mobile: +1 (347 at an industrial solar-energy project developer. Function: Autonomy Auditing New business in Renewable Energy Ecole Des Mines ParisTech ­ Kassel University First Semester

  12. EMSL Quarterly Highlights Report: 1st Quarter, FY08

    SciTech Connect (OSTI)

    Showalter, Mary Ann

    2008-01-28T23:59:59.000Z

    The EMSL Quarterly Highlights Report covers the science, staff and user recognition, and publication activities that occurred during the 1st quarter (October 2007 - December 2007) of Fiscal Year 2008.

  13. Wild and Scenic River Acts (Lower St. Croix Riverway)

    Broader source: Energy.gov [DOE]

    The lower portion of the St. Croix River in Minnesota and Wisconsin is regulated under the National Wild and Scenic Rivers Program. Most new residential, commercial, and industrial uses are...

  14. LOCH/ARMA Open Access Good Practice - St Andrews University 

    E-Print Network [OSTI]

    Aucock, Janet

    2015-03-19T23:59:59.000Z

    Presentation delivered by Janet Aucock at ARMA Open Access Good Practice event (London 19-03-2015). These slides detail St Andrews University's approach to implementing Open Access requirements for the post-2014 REF....

  15. Thermoelectric properties of p-type (Bi{sub 1{minus}x}Sb{sub x}){sub 2}Te{sub 3} fabricated by mechanical alloying process

    SciTech Connect (OSTI)

    Jung, B.Y.; Choi, J.S.; Oh, T.S.; Hyun, D.B.

    1997-07-01T23:59:59.000Z

    Thermoelectric properties of polycrystalline (Bi{sub 1{minus}x}Sb{sub x}){sub 2}Te{sub 3} (0.75 {le} x {le} 0.85), fabricated by mechanical alloying and hot pressing methods, have been investigated. Formation of (Bi{sub 0.25}Sb{sub 0.75}){sub 2}Te{sub 3} alloy powder was completed by mechanical alloying for 5 hours at ball-to-material ratio of 5:1, and processing time for (Bi{sub 1{minus}sub x}Sb{sub x}){sub 2}Te{sub 3} formation increased with Sb{sub 2}Te{sub 3} content x. When (Bi{sub 0.25}Sb{sub 0.75}){sub 2}Te{sub 3} was hot pressed at temperatures ranging from 300 C to 550 C for 30 minutes, figure-of-merit increased with hot pressing temperature and maximum value of 2.8 x 10{sup {minus}3}/K could be obtained by hot pressing at 550 C. When hot pressed at 550 C, (Bi{sub 0.2}Sb{sub 0.8}){sub 2}Te{sub 3} exhibited figure-of-merit of 2.92 x 10{sup {minus}3}/K, which could be improved to 2.97 x 10{sup {minus}3}/K with addition of 1 wt% Sb as acceptor dopant.

  16. Public health assessment for St. Louis Airport, Hazelwood Interim Storage/Futura Coatings Company, St. Louis, St. Louis County, Missouri, Region 7. Cerclis No. MOD980633176. Preliminary report

    SciTech Connect (OSTI)

    Not Available

    1994-01-20T23:59:59.000Z

    The St. Louis Airport/Hazelwood Iterim Storage/Futura Coatings Company, a National Priorities List site, is in St. Louis County, Missouri. From 1946 to 1973, the site was used to store radioactive materials resulting from uranium processing. High levels of uranium, thorium, radium, and radon were detected in soil, groundwater, and air. The site is still being used to store radioactive materials. The Agency for Toxic Substances and Disease Registry considers the St. Louis Airport site to be an indeterminate public health hazard. Although there are emissions of radon and the presence of thorium in on-site air and off-site soils and the emission of radiation resulting from the presence of these materials is not currently considered a health hazard. At present conditions, the concentration of radon off-site is indistinguishable from background levels. However, in the past, these contaminants may have been present at levels of health concern.

  17. Ultrafast terahertz-induced response of GeSbTe phase-change materials

    SciTech Connect (OSTI)

    Shu, Michael J. [Department of Applied Physics, Stanford University, Stanford, California 94305 (United States); Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Zalden, Peter [Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Chen, Frank [Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States); Weems, Ben [Department of Materials Science and Engineering, Stanford University, Stanford, California 94305 (United States); Chatzakis, Ioannis [Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Xiong, Feng; Jeyasingh, Rakesh; Pop, Eric; Philip Wong, H.-S. [Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States); Hoffmann, Matthias C. [SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Wuttig, Matthias [I. Physikalisches Institut, RWTH Aachen University, 52056 Aachen (Germany); JARA–Fundamentals of Information Technology, RWTH Aachen University, 52056 Aachen (Germany); Lindenberg, Aaron M., E-mail: aaronl@stanford.edu [Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States); Department of Materials Science and Engineering, Stanford University, Stanford, California 94305 (United States)

    2014-06-23T23:59:59.000Z

    The time-resolved ultrafast electric field-driven response of crystalline and amorphous GeSbTe films has been measured all-optically, pumping with single-cycle terahertz pulses as a means of biasing phase-change materials on a sub-picosecond time-scale. Utilizing the near-band-gap transmission as a probe of the electronic and structural response below the switching threshold, we observe a field-induced heating of the carrier system and resolve the picosecond-time-scale energy relaxation processes and their dependence on the sample annealing condition in the crystalline phase. In the amorphous phase, an instantaneous electroabsorption response is observed, quadratic in the terahertz field, followed by field-driven lattice heating, with Ohmic behavior up to 200?kV/cm.

  18. RELAP5 simulation of SB LOCA in a VVER 440 model

    SciTech Connect (OSTI)

    Parzer, I.; Mavko, B.; Petelin, S.

    1992-01-01T23:59:59.000Z

    The VVER-440-type plants differ considerably from western-type pressurized water reactors (PWR). The two main distinguishing characteristics are horizontal steam generators and loop seals in both hot and cold legs, which are lately a great safety concern worldwide. In 1987, the International Atomic Energy Agency (IAEA) organized and sponsored one of the tests performed on the Hungarian PMK-NVH test facility and called it IAEA-SPE-2. The test was chosen from a wider test matrix performed to investigate emergency core cooling system capability in VVER-440 plants for a small-break loss-of-coolant accident (SB LOCA). PMK-NVA is a one-loop, full-height, full-pressure model of the Hungarian Paks nuclear power plant, type VVER-440, Soviet production. The facility power level is 100%, according to the 1:2070 scaling factor.

  19. Properties of CoSb{sub 3} films grown by pulsed laser deposition

    SciTech Connect (OSTI)

    Christen, H.M.; Mandrus, D.G.; Norton, D.P.; Boatner, L.A.; Sales, B.C.

    1997-07-01T23:59:59.000Z

    Polycrystalline CoSb{sub 3} films were grown on a variety of electrically insulating substrates by pulsed laser ablation from a stoichiometric hot-pressed target. These films are fully crystallized in the skutterudite structure, and the grains exhibit a strongly preferred alignment of the cubic [310]-axis perpendicular to the substrate surface. The film quality is studied for different single-crystal substrates and as a function of growth temperature and background gas. Hall measurements show that the films are p-type semiconducting with a room-temperature carrier density of 3 x 10{sup 20} holes/cm{sup 3}. The Hall mobility is found to be 50 to 60 cm{sup 2}/Vs, which is high for such a heavily-doped material. The Seebeck coefficient and the resistivity are measured as a function of temperature and are compared to bulk measurements.

  20. Photocapacitance study of type-II GaSb/GaAs quantum ring solar cells

    SciTech Connect (OSTI)

    Wagener, M. C.; Botha, J. R. [Department of Physics, Nelson Mandela Metropolitan University, Port Elizabeth (South Africa); Carrington, P. J.; Krier, A. [Department of Physics, Lancaster University, Lancaster LA1 4YB (United Kingdom)

    2014-01-07T23:59:59.000Z

    In this study, the density of states associated with the localization of holes in GaSb/GaAs quantum rings are determined by the energy selective charging of the quantum ring distribution. The authors show, using conventional photocapacitance measurements, that the excess charge accumulated within the type-II nanostructures increases with increasing excitation energies for photon energies above 0.9?eV. Optical excitation between the localized hole states and the conduction band is therefore not limited to the ?(k?=?0) point, with pseudo-monochromatic light charging all states lying within the photon energy selected. The energy distribution of the quantum ring states could consequently be accurately related from the excitation dependence of the integrated photocapacitance. The resulting band of localized hole states is shown to be well described by a narrow distribution centered 407?meV above the GaAs valence band maximum.

  1. Evaluation of the two-photon absorption characteristics of GaSb/GaAs quantum rings

    SciTech Connect (OSTI)

    Wagener, M. C.; Botha, J. R. [Department of Physics, Nelson Mandela Metropolitan University, Port Elizabeth 6031 (South Africa); Carrington, P. J. [Department of Electronic and Electrical Engineering, University College London, London (United Kingdom); Krier, A. [Department of Physics, Lancaster University, Lancaster LA1 4YB (United Kingdom)

    2014-07-28T23:59:59.000Z

    The optical parameters describing the sub-bandgap response of GaSb/GaAs quantum rings solar cells have been obtained from photocurrent measurements using a modulated pseudo-monochromatic light source in combination with a second, continuous photo-filling source. By controlling the charge state of the quantum rings, the photoemission cross-sections describing the two-photon sub-bandgap transitions could be determined independently. Temperature dependent photo-response measurements also revealed that the barrier for thermal hole emission from the quantum rings is significantly below the quantum ring localisation energy. The temperature dependence of the sub-bandgap photo-response of the solar cell is also described in terms of the photo- and thermal-emission characteristics of the quantum rings.

  2. NGC 1266: Characterization of the Nuclear Molecular Gas in an Unusual SB0 Galaxy

    E-Print Network [OSTI]

    Glenn, Jason; Maloney, Philip R; Kamenetzky, Julia R

    2015-01-01T23:59:59.000Z

    With a substantial nuclear molecular gas reservoir and broad, high-velocity CO molecular line wings previously interpreted as an outflow, NGC 1266 is a rare SB$0$ galaxy. Previous analyses of interferometry, spectrally resolved low-$J$ CO emission lines, and unresolved high-$J$ emission lines have established basic properties of the molecular gas and the likely presence of an AGN. Here, new spectrally resolved CO $J = 5 - 4$ to $J = 8 - 7$ lines from {\\it Herschel Space Observatory} HIFI observations are combined with ground-based observations and high-$J$ {\\it Herschel} SPIRE observations to decompose the nuclear and putative outflow velocity components and to model the molecular gas to quantify its properties. Details of the modeling and results are described, with comparisons to previous results and exploration of the implications for the gas excitation mechanisms. Among the findings, like for other galaxies, the nuclear and putative outflow molecular gas are well represented by components that are cool ($...

  3. Evaluation of electron mobility in InSb quantum wells by means of percentage-impact

    SciTech Connect (OSTI)

    Mishima, T. D.; Edirisooriya, M.; Santos, M. B. [Homer L. Dodge Department of Physics and Astronomy, and Center for Semiconductor Physics in Nanostructure, University of Oklahoma, 440 W. Brooks St., Norman, OK 73019 (United States)

    2014-05-15T23:59:59.000Z

    In order to quantitatively analyze the contribution of each scattering factor toward the total carrier mobility, we use a new convenient figure-of-merit, named a percentage impact. The mobility limit due to a scattering factor, which is widely used to summarize a scattering analysis, has its own advantage. However, a mobility limit is not quite appropriate for the above purpose. A comprehensive understanding of the difference in contribution among many scattering factors toward the total carrier mobility can be obtained by evaluating percentage impacts of scattering factors, which can be straightforwardly calculated from their mobility limits and the total mobility. Our percentage impact analysis shows that threading dislocation is one of the dominant scattering factors for the electron transport in InSb quantum wells at room temperature.

  4. Structural and optical properties of Sb{sub 2}S{sub 3} nanocrystals in glass

    SciTech Connect (OSTI)

    Mishra, Rakesh K., E-mail: mishrarake@gmail.com; Kashyap, Raman, E-mail: mishrarake@gmail.com; Vedeshwar, A. G., E-mail: mishrarake@gmail.com; Tandon, R. P., E-mail: mishrarake@gmail.com [Department of Physics and Astrophysics, University of Delhi, Delhi 1-10007 (India)

    2014-04-24T23:59:59.000Z

    In this work conventional solid state precipitation method is adopted to fabricate Sb{sub 2}S{sub 3} nanocrystals in glass. The glass composition is optimized for proper host glass matrix to grow antimony trisulphide semiconductor quantum dots. The dot size is modified by heat treatment of glass samples in the temperature range from 550°C to 700°C for various time durations. Structural studies are carried out by X-ray diffraction and transmission electron microscopy and nanoparticles with size ranges from 8 nm to 70 nm are obtained. Quantum dots so grown were further characterized by optical absorption spectroscopy and a blue shift is observed for absorption edge energy that conform the quantum confinement effect.

  5. Careers 2011 April 7, 2011 1. 21st Mortgage Corp 620 Market ST Knoxville TN 37902 Gene Crabtree

    E-Print Network [OSTI]

    Karsai, Istvan

    Joseph Anderson, et al 15. King College 1350 King College RD Bristol TN 37620 Mona Salyer 16. Mary Kay Kelly Mullins 5. Bristol TN Police Dept 801 Anderson ST Bristol TN 37620 Grant Hale 6. Carson Newman

  6. High thermoelectric performance BiSbTe alloy with unique low-dimensional structure

    SciTech Connect (OSTI)

    Xie Wenjie [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (China); Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634-0978 (United States); Tang Xinfeng; Yan Yonggao; Zhang Qingjie [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (China); Tritt, Terry M. [Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634-0978 (United States)

    2009-06-01T23:59:59.000Z

    We report a detailed description of an innovative route of a melt spinning (MS) technique combined with a subsequent spark plasma sintering process in order to obtain high performance p-type Bi{sub 0.52}Sb{sub 1.48}Te{sub 3} bulk material, which possesses a unique low-dimensional structure. The unique structure consists of an amorphous structure, 5-15 nm fine nanocrystalline regions, and coherent interfaces between the resulting nanocrystalline regions. Measurements of the thermopower, electrical conductivity, and thermal conductivity have been performed over a range of temperature of 300-400 K. We found that MS technique can give us considerable control over the resulting nanostructure with good thermal stability during the temperature range of 300-400 K and this unique structure can effectively adjust the transport of phonons and electrons, in a manner such that it is beneficial to the overall thermoelectric performance of the material, primarily a reduction in the lattice thermal conductivity. Subsequently, this results in a maximum figure of merit ZT value of 1.56 at 300 K for p-type Bi{sub 0.52}Sb{sub 1.48}Te{sub 3} bulk material. This ZT value is over a 50% improvement of that of the state of the art commercial Bi{sub 2}Te{sub 3} materials. We also report results of thermal cycling of this material for over one hundred cycles between 300-400 K. Our work offers an innovative route for developing high performance bismuth telluride based alloys and devices, which have even broader prospects for commercial applications. This technique may also be applicable to other thermoelectric materials.

  7. THE CHAPEL OF ST HUGH AND ST CHAD IN THE KING'S HALL AND COLLEGE OF BRASENOSE MUSIC LIST, TRINITY TERM 2013

    E-Print Network [OSTI]

    Oxford, University of

    THE CHAPEL OF ST HUGH AND ST CHAD IN THE KING'S HALL AND COLLEGE OF BRASENOSE MUSIC LIST, TRINITY Eucharist, 6pm Congregational Setting: Cullen Motet: Lead me, Lord - SS Wesley 6th Week - Trinity Sunday

  8. The final Record of Decision for the St. Louis North County Sites (ROD) presents the final remedy for cleanup of sites in North St. Louis County that

    E-Print Network [OSTI]

    US Army Corps of Engineers

    with the nation's early atomic program. These sites consist of the St. Louis Airport Site (SLAPS), SLAPS Vicinity

  9. Sustainable Land Management in Northern Namibia

    E-Print Network [OSTI]

    and low water holding capacity (Bolivia) #12;Perspective Similar soil (Kavango) #12;Increased Demand for Food + Energy Production Expansion onto Less Resilient Lands Reduced Production per Unit Area

  10. Bicon Namibia Consulting Engineers | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof Energy 2,AUDIT REPORT Americium/CuriumAguaBBBWind LtdFengliBenjaminBhoruka

  11. Dramatic thermal conductivity reduction by nanostructures for large increase in thermoelectric figure-of-merit of FeSb[subscript 2

    E-Print Network [OSTI]

    Chen, Gang

    In this report, thermal conductivity reduction by more than three orders of magnitude over its single crystal counterpart for the strongly correlated system FeSb[subscript 2] through a nanostructure approach was presented, ...

  12. Enhanced photoelectrochemical performance of rutile TiO{sub 2} by Sb-N donor-acceptor coincorporation from first principles calculations

    SciTech Connect (OSTI)

    Niu Mang; Xu Wenjie; Shao Xiaohong [College of Science, Beijing University of Chemical Technology, Beijing 100029 (China); Cheng Daojian [Division of Molecular and Materials Simulation, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029 (China)

    2011-11-14T23:59:59.000Z

    An effective non-metal (N) and non-transition metal (Sb) passivated co-doping approach is proposed to improve the photoelectochemical performance of rutile TiO{sub 2} for water-splitting by using first-principles calculations. It is found that the band edges of N + Sb co-doped TiO{sub 2} match with the redox potentials of water, and a narrow band gap (2.0 eV) is achieved for enhanced visible light absorption. The compensated donor (Sb) and acceptor (N) pairs could prevent the recombination of photo-generated electron-hole pairs. In addition, the N + Sb defect pairs tend to bind with each other, which could enhance the stability and N concentration of the system.

  13. Simulation of Crystallization in Ge[subscript 2]Sb[subscript 2]Te[subscript 2]: A Memory Effect in the Canonical Phase-Change Material

    E-Print Network [OSTI]

    Akola, J.

    Crystallization of amorphous Ge[subscript 2]Sb[subscript 2]Te[subscript 5] (GST) has been studied using four extensive (460 atoms, up to 4 ns) density functional/molecular dynamics simulations at 600 K. This phase change ...

  14. The effects of surface bond relaxation on electronic structure of Sb{sub 2}Te{sub 3} nano-films by first-principles calculation

    SciTech Connect (OSTI)

    Li, C., E-mail: canli1983@gmail.com; Zhao, Y. F.; Fu, C. X.; Gong, Y. Y. [Center for Coordination Bond Engineering, School of Materials Science and Engineering, China Jiliang University (China); Chi, B. Q. [College of Modem Science and Technology, Jiliang University, Hangzhou, 310018 (China); Sun, C. Q. [Center for Coordination Bond Engineering, School of Materials Science and Engineering, China Jiliang University (China); School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 (Singapore)

    2014-10-15T23:59:59.000Z

    The effects of vertical compressive stress on Sb{sub 2}Te{sub 3} nano-films have been investigated by the first principles calculation, including stability, electronic structure, crystal structure, and bond order. It is found that the band gap of nano-film is sensitive to the stress in Sb{sub 2}Te{sub 3} nano-film and the critical thickness increases under compressive stress. The band gap and band order of Sb{sub 2}Te{sub 3} film has been affected collectively by the surface and internal crystal structures, the contraction ratio between surface bond length of nano-film and the corresponding bond length of bulk decides the band order of Sb{sub 2}Te{sub 3} film.

  15. Visible-light absorption and large band-gap bowing of GaN1-xSbx from first principles

    SciTech Connect (OSTI)

    Sheetz, R. Michael; Richter, Ernst; Andriotis, Antonis N.; Lisenkov, Sergey; Pendyala, Chandrashekhar; Sunkara, Mahendra K.; Menon, Madhu

    2011-08-01T23:59:59.000Z

    Applicability of the Ga(Sbx)N1-x alloys for practical realization of photoelectrochemical water splitting is investigated using first-principles density functional theory incorporating the local density approximation and generalized gradient approximation plus the Hubbard U parameter formalism. Our calculations reveal that a relatively small concentration of Sb impurities is sufficient to achieve a significant narrowing of the band gap, enabling absorption of visible light. Theoretical results predict that Ga(Sbx)N1-x alloys with 2-eV band gaps straddle the potential window at moderate to low pH values, thus indicating that dilute Ga(Sbx)N1-x alloys could be potential candidates for splitting water under visible light irradiation.

  16. Selenization of Sb{sub 2}Se{sub 3} absorber layer: An efficient step to improve device performance of CdS/Sb{sub 2}Se{sub 3} solar cells

    SciTech Connect (OSTI)

    Leng, Meiying; Luo, Miao; Chen, Chao; Qin, Sikai; Chen, Jie; Zhong, Jie; Tang, Jiang, E-mail: jtang@mail.hust.edu.cn [Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan, 430074 Hubei (China); School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074 Hubei (China)

    2014-08-25T23:59:59.000Z

    Sb{sub 2}Se{sub 3} appeared as a very promising solar absorber because of their attractive material, optical and electrical properties. Previously, we reported thermal evaporated superstrate CdS/Sb{sub 2}Se{sub 3} solar cell achieving 1.9% efficiency. In this letter, we improved device performance to 3.7% (Voc?=?0.335?V, Jsc?=?24.4?mA/cm{sup 2}, and FF?=?46.8%) by an additional selenization step. Careful external quantum efficiency, capacitance-voltage profiling, and photoresponse study indicated selenization probably compensated selenium loss during thermal evaporation, reducing V{sub Se} associated recombination loss and improving device performance.

  17. Atomistic modeling and HAADF investigations of misfit and threading dislocations in GaSb/GaAs hetero-structures for applications in high electron mobility transistors

    SciTech Connect (OSTI)

    Ruterana, Pierre, E-mail: pierre.ruterana@ensicaen.fr; Wang, Yi, E-mail: pierre.ruterana@ensicaen.fr; Chen, Jun, E-mail: pierre.ruterana@ensicaen.fr; Chauvat, Marie-Pierre, E-mail: pierre.ruterana@ensicaen.fr [CIMAP, UMR 6252 CNRS, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex (France); El Kazzi, S.; Deplanque, L.; Wallart, X. [IEMN, UMR-CNRS 8520, CS 60069, 59652 Villeneuve d'Ascq Cedex (France)

    2014-10-06T23:59:59.000Z

    A detailed investigation on the misfit and threading dislocations at GaSb/GaAs interface has been carried out using molecular dynamics simulation and quantitative electron microscopy techniques. The sources and propagation of misfit dislocations have been elucidated. The nature and formation mechanisms of the misfit dislocations as well as the role of Sb on the stability of the Lomer configuration have been explained.

  18. Staircase and saw-tooth field emission steps from nanopatterned n-type GaSb surfaces

    SciTech Connect (OSTI)

    Kildemo, M.; Levinsen, Y. Inntjore; Le Roy, S.; Soenderga ring rd, E. [Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondlieim (Norway); Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondlieim, Norway and AB CERN, CH- 1211 Geneva 23 (Switzerland); Laboratoire Surface du Verre et Interfaces, UMR 125 Unite Mixte de Recherche CNRS/Saint-Gobain Laboratoire, 39 Quai Lucien Lefranc, F-93303 Aubervilliers Cedex (France)

    2009-09-15T23:59:59.000Z

    High resolution field emission experiments from nanopatterned GaSb surfaces consisting of densely packed nanocones prepared by low ion-beam-energy sputtering are presented. Both uncovered and metal-covered nanopatterned surfaces were studied. Surprisingly, the field emission takes place by regular steps in the field emitted current. Depending on the field, the steps are either regular, flat, plateaus, or saw-tooth shaped. To the author's knowledge, this is the first time that such results have been reported. Each discrete jump in the field emission may be understood in terms of resonant tunneling through an extended surface space charge region in an n-type, high aspect ratio, single GaSb nanocone. The staircase shape may be understood from the spatial distribution of the aspect ratio of the cones.

  19. Effect of antimony on the deep-level traps in GaInNAsSb thin films

    SciTech Connect (OSTI)

    Islam, Muhammad Monirul, E-mail: islam.monir.ke@u.tsukuba.ac.jp; Miyashita, Naoya; Ahsan, Nazmul; Okada, Yoshitaka [Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro ku, Tokyo 153-8904 (Japan); Sakurai, Takeaki; Akimoto, Katsuhiro [Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)

    2014-09-15T23:59:59.000Z

    Admittance spectroscopy has been performed to investigate the effect of antimony (Sb) on GaInNAs material in relation to the deep-level defects in this material. Two electron traps, E1 and E2 at an energy level 0.12 and 0.41?eV below the conduction band (E{sub C}), respectively, were found in undoped GaInNAs. Bias-voltage dependent admittance confirmed that E1 is an interface-type defect being spatially localized at the GaInNAs/GaAs interface, while E2 is a bulk-type defect located around mid-gap of GaInNAs layer. Introduction of Sb improved the material quality which was evident from the reduction of both the interface and bulk-type defects.

  20. Methods for chemical recovery of non-carrier-added radioactive tin from irradiated intermetallic Ti-Sb targets

    DOE Patents [OSTI]

    Lapshina, Elena V. (Troitsk, RU); Zhuikov, Boris L. (Troitsk, RU); Srivastava, Suresh C. (Setauket, NY); Ermolaev, Stanislav V. (Obninsk, RU); Togaeva, Natalia R. (Obninsk, RU)

    2012-01-17T23:59:59.000Z

    The invention provides a method of chemical recovery of no-carrier-added radioactive tin (NCA radiotin) from intermetallide TiSb irradiated with accelerated charged particles. An irradiated sample of TiSb can be dissolved in acidic solutions. Antimony can be removed from the solution by extraction with dibutyl ether. Titanium in the form of peroxide can be separated from tin using chromatography on strong anion-exchange resin. In another embodiment NCA radiotin can be separated from iodide solution containing titanium by extraction with benzene, toluene or chloroform. NCA radiotin can be finally purified from the remaining antimony and other impurities using chromatography on silica gel. NCA tin-117m can be obtained from this process. NCA tin-117m can be used for labeling organic compounds and biological objects to be applied in medicine for imaging and therapy of various diseases.

  1. The effects of the initial stages of native-oxide formation on the surface properties of GaSb (001)

    SciTech Connect (OSTI)

    Bermudez, V. M. [Electronics Science and Technology Division, Naval Research Laboratory, Washington, DC 20375 (United States)

    2013-07-14T23:59:59.000Z

    Atomically clean surfaces of n-type GaSb (001) have been prepared by a combination of ex-situ wet-chemical treatment in HCl and in-situ annealing in a flux of H atoms in ultra-high vacuum (UHV). The surfaces are exposed to 'excited' O{sub 2} and studied using primarily x-ray photoelectron spectroscopy. Low O{sub 2} exposures, up to {approx}3 Multiplication-Sign 10{sup 3} Langmuirs (L), result in a partial passivation of electrically active defects as shown by a decrease in upward band bending. Adsorption of O{sub 2} in this exposure range appears to form mainly Ga{sup +1} sites, with little or no indication of Ga{sup +3}, and saturates at an O coverage of {approx}0.2-0.3 monolayers. For exposures of {approx}10{sup 4} L or higher, oxidation occurs through insertion into Ga-Sb bonds as indicated by the onset of Ga{sup +3} as well as of Sb{sup +4} and/or Sb{sup +5} together with the appearance of an O 1s feature. Defects resulting from this process cause a reversal of the band-bending change seen for smaller exposures. Data obtained for the composition of a native oxide formed in situ in UHV are compared with those for a 'practical' surface produced by processing under ambient conditions. These results suggest an optimum procedure for forming a Ga{sub 2}O{sub 3} layer prior to the growth by atomic layer deposition of an Al{sub 2}O{sub 3} layer.

  2. Abstract KeLP \\Lambda S.B. Baden y , P. Colella z , D. Shalit y , B. Van

    E-Print Network [OSTI]

    Baden, Scott B.

    ``paper'' 2000/12/12 page 1 i i i i i i i i Abstract KeLP \\Lambda S.B. Baden y , P. Colella z , D. The resultant infrastructure, called KeLP \\Lambda , has been applied to a variety of applications including­ tured adaptive refinement for ab­initio molecular dynamics [13]. A distinguishing feature of KeLP

  3. Electron interactions and Dirac fermions in graphene-Ge{sub 2}Sb{sub 2}Te{sub 5} superlattices

    SciTech Connect (OSTI)

    Sa, Baisheng [College of Materials, and Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005 (China); Sun, Zhimei, E-mail: zmsun@buaa.edu.cn [School of Materials Science and Engineering, and Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191 (China)

    2014-06-21T23:59:59.000Z

    Graphene based superlattices have been attracted worldwide interest due to the combined properties of the graphene Dirac cone feature and all kinds of advanced functional materials. In this work, we proposed a novel series of graphene-Ge{sub 2}Sb{sub 2}Te{sub 5} superlattices based on the density functional theory calculations. We demonstrated the stability in terms of energy and lattice dynamics for such kind of artificial materials. The analysis of the electronic structures unravels the gap opening nature at Dirac cone of the insert graphene layer. The Dirac fermions in the graphene layers are strongly affected by the electron spin orbital coupling in the Ge{sub 2}Sb{sub 2}Te{sub 5} layers. The present results show the possible application in phase-change data storage of such kind of superlattice materials, where the Ge{sub 2}Sb{sub 2}Te{sub 5} layers exhibit as the phase-change data storage media and the graphene layer works as the electrode, probe, and heat conductor.

  4. Argon-ion-induced formation of nanoporous GaSb layer: Microstructure, infrared luminescence, and vibrational properties

    SciTech Connect (OSTI)

    Datta, D. P.; Som, T., E-mail: tsom@iopb.res.in [SUNAG Laboratory, Institute of Physics, Bhubaneswar, Odisha 751 005 (India); Kanjilal, A. [Department of Physics, Shiv Nadar University, Uttar Pradesh 201 314 (India); Satpati, B. [Surface Physics and Material Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India); Dhara, S. [Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102 (India); Das, T. D. [Department of Electronic Science, University of Calcutta, APC Road, Kolkata 700 009 (India); Kanjilal, D. [Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110 067 (India)

    2014-07-21T23:59:59.000Z

    Room temperature implantation of 60?keV Ar{sup +}-ions in GaSb to the fluences of 7?×?10{sup 16} to 3?×?10{sup 18} ions cm{sup ?2} is carried out at two incidence angles, viz 0° and 60°, leading to formation of a nanoporous layer. As the ion fluence increases, patches grow on the porous layer under normal ion implantation, whereas the porous layer gradually becomes embedded under a rough top surface for oblique incidence of ions. Grazing incidence x-ray diffraction and cross-sectional transmission electron microscopy studies reveal the existence of nanocrystallites embedded in the ion-beam amorphized GaSb matrix up to the highest fluence used in our experiment. Oxidation of the nanoporous layers becomes obvious from x-ray photoelectron spectroscopy and Raman mapping. The correlation of ion-beam induced structural modification with photoluminescence signals in the infrared region has further been studied, showing defect induced emission of additional peaks near the band edge of GaSb.

  5. Superconductivity, magnetic order, and quadrupolar order in the filled skutterudite system Pr 1 ? x Nd x Os 4 Sb 12

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

    Ho, P.-C.; Yanagisawa, T.; Yuhasz, W. M.; Dooraghi, A. A.; Robinson, C. C.; Butch, N. P.; Baumbach, R. E.; Maple, M. B.

    2011-01-01T23:59:59.000Z

    Superconductivity, magnetic order, and the high field ordered phase have been investigated in the filled skutterudite system Pr1-xNdxOs?Sb?? as a function of composition x in magnetic fields up to 9 T and at temperatures between 50 mK and 10 K. Electrical resistivity measurements indicate that the high field ordered phase, which has been identified with antiferroquadruoplar order, persists to x ~ 0.5. The superconducting critical temperature Tc of PrOs?Sb?? is depressed linearly with Nd concentration to x ~ 0.55, whereas the Curie temperature TFM of NdOs?Sb?? is depressed linearly with Pr composition to (1-x) ~ 0.45. In the superconducting region, the upper critical field Hc2(x,0) is depressed quadratically with x in the range 0 c2(x,0) appears to be a result of pair breaking caused by the applied magnetic field and the exchange field associated with the polarization of the Nd magnetic moments in the superconducting state. From magnetic susceptibility measurements, the correlations between the Nd moments in the superconducting state appear to change from ferromagnetic in the range 0.3 ? x ? 0.6 to antiferromagnetic in the range 0 c2(x,0) with x.

  6. 60 keV Ar{sup +}-ion induced modification of microstructural, compositional, and vibrational properties of InSb

    SciTech Connect (OSTI)

    Datta, D. P.; Garg, S. K.; Som, T., E-mail: tsom@iopb.res.in [SUNAG Laboratory, Institute of Physics, Bhubaneswar, Odisha 751005 (India); Satpati, B. [Surface Physics and Materials Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India); Sahoo, P. K. [School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar 751005, Odisha (India); Kanjilal, A. [Department of Physics, Shiv Nadar University, Uttar Pradesh 203207 (India); Dhara, S. [Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102 (India); Kanjilal, D. [Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067 (India)

    2014-10-14T23:59:59.000Z

    Room temperature irradiation of InSb(111) by 60?keV Ar{sup +}-ions at normal (0°) and oblique (60°) angles of incidence led to the formation of nanoporous structure in the high fluence regime of 1?×?10{sup 17} to 3?×?10{sup 18} ions cm{sup ?2}. While a porous layer comprising of a network of interconnected nanofibers was generated by normal ion incidence, evolution of plate-like structures was observed for obliquely incident ions. Systematic studies of composition and structure using energy dispersive x-ray spectroscopy, Raman spectroscopy, x-ray photoelectron spectroscopy, Raman mapping, grazing incidence x-ray diffraction, and cross-sectional transmission electron microscopy revealed a high degree of oxidation of the ion-induced microstructures with the presence of In{sub 2}O{sub 3} and Sb{sub 2}O{sub 3} phases and presence of nanocrystallites within the nanoporous structures. The observed structural evolution was understood in terms of processes driven by ion-induced defect accumulation within InSb.

  7. St. Lucie County Summary of Reported Data | Department of Energy

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Site EnvironmentalEnergySafelyVirtual Toolkit Spring 2015 Virtual ToolkitSpurringSt.St.

  8. City of St Robert, Missouri (Utility Company) | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof EnergyInnovationin UrbanCity ofCity of Spencer, Iowa (UtilityCity of StSt Robert,

  9. Quantum efficiency investigations of type-II InAs/GaSb midwave infrared superlattice photodetectors

    SciTech Connect (OSTI)

    Giard, E., E-mail: edouard.giard@onera.fr; Ribet-Mohamed, I.; Jaeck, J.; Viale, T.; Haïdar, R. [ONERA, DOTA, Chemin de la Hunière, 91761 Palaiseau Cedex (France); Taalat, R.; Delmas, M.; Rodriguez, J.-B.; Christol, P. [Institut d'Electronique du Sud, UMR-CNRS 5214, Université Montpellier 2, Place Eugène Bataillon, 34095 Montpellier Cedex 5 (France); Steveler, E.; Bardou, N. [Laboratoire de Photonique et de Nanostructures (LPN-CNRS), Route de Nozay, 91460 Marcoussis (France); Boulard, F. [CEA, LETI, MINATEC Campus, 17 Avenue des martyrs, 38054 Grenoble (France)

    2014-07-28T23:59:59.000Z

    We present in this paper a comparison between different type-II InAs/GaSb superlattice (T2SL) photodiodes and focal plane array (FPA) in the mid-wavelength infrared domain to understand which phenomenon drives the performances of the T2SL structure in terms of quantum efficiency (QE). Our measurements on test photodiodes suggest low minority carrier diffusion length in the “InAs-rich” design, which penalizes carriers' collection in this structure for low bias voltage and front side illumination. This analysis is completed by a comparison of the experimental data with a fully analytic model, which allows to infer a hole diffusion length shorter than 100?nm. In addition, measurements on a FPA with backside illumination are finally presented. Results show an average QE in the 3–4.7 ?m window equal to 42% for U{sub bias}?=??0.1?V, 77?K operating temperature and no anti-reflection coating. These measurements, completed by modulation transfer function and noise measurements, reveal that the InAs-rich design, despite a low hole diffusion length, is promising for high performance infrared imaging applications.

  10. XRD, Electron Microscopy and Vibrational Spectroscopy Characterization of Simulated SB6 HLW Glasses - 13028

    SciTech Connect (OSTI)

    Stefanovsky, S.V. [SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121 (Russian Federation) [SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121 (Russian Federation); Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31, Moscow 119991 (Russian Federation); Nikonov, B.S.; Omelianenko, B.I. [Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Staromonetniy lane 35, Moscow 100117 (Russian Federation)] [Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Staromonetniy lane 35, Moscow 100117 (Russian Federation); Choi, A.; Marra, J.C. [Savannah River National Laboratory, Building 773A, Aiken 29808 (United States)] [Savannah River National Laboratory, Building 773A, Aiken 29808 (United States)

    2013-07-01T23:59:59.000Z

    Sample glasses have been made using SB6 high level waste (HLW) simulant (high in both Al and Fe) with 12 different frit compositions at a constant waste loading of 36 wt.%. As follows from X-ray diffraction (XRD) and optical and scanning electron microscopy (SEM) data, all the samples are composed of primarily glass and minor concentration of spinel phases which form both isometric grains and fine cubic (?1 ?m) crystals. Infrared spectroscopy (IR) spectra of all the glasses within the range of 400-1600 cm{sup -1} consist of the bands due to stretching and bending modes in silicon-oxygen, boron-oxygen, aluminum-oxygen and iron-oxygen structural groups. Raman spectra showed that for the spectra of all the glasses within the range of 850-1200 cm{sup -1} the best fit is achieved by suggestion of overlapping of three major components with maxima at 911-936 cm{sup -1}, 988-996 cm{sup -1} and 1020-1045 cm{sup -1}. The structural network is primarily composed of metasilicate chains and rings with embedded AlO{sub 4} and FeO{sub 4} tetrahedra. Major BO{sub 4} tetrahedra and BO{sub 3} triangles form complex borate units and are present as separate constituents. (authors)

  11. Activity of the kinesin spindle protein inhibitor ispinesib (SB-715992) in models of breast cancer

    SciTech Connect (OSTI)

    Purcell, James W; Davis, Jefferson; Reddy, Mamatha; Martin, Shamra; Samayoa, Kimberly; Vo, Hung; Thomsen, Karen; Bean, Peter; Kuo, Wen Lin; Ziyad, Safiyyah; Billig, Jessica; Feiler, Heidi S; Gray, Joe W; Wood, Kenneth W; Cases, Sylvaine

    2009-06-10T23:59:59.000Z

    Ispinesib (SB-715992) is a potent inhibitor of kinesin spindle protein (KSP), a kinesin motor protein essential for the formation of a bipolar mitotic spindle and cell cycle progression through mitosis. Clinical studies of ispinesib have demonstrated a 9% response rate in patients with locally advanced or metastatic breast cancer, and a favorable safety profile without significant neurotoxicities, gastrointestinal toxicities or hair loss. To better understand the potential of ispinesib in the treatment of breast cancer we explored the activity of ispinesib alone and in combination several therapies approved for the treatment of breast cancer. We measured the ispinesib sensitivity and pharmacodynamic response of breast cancer cell lines representative of various subtypes in vitro and as xenografts in vivo, and tested the ability of ispinesib to enhance the anti-tumor activity of approved therapies. In vitro, ispinesib displayed broad anti-proliferative activity against a panel of 53 breast cell-lines. In vivo, ispinesib produced regressions in each of five breast cancer models, and tumor free survivors in three of these models. The effects of ispinesib treatment on pharmacodynamic markers of mitosis and apoptosis were examined in vitro and in vivo, revealing a greater increase in both mitotic and apoptotic markers in the MDA-MB-468 model than in the less sensitive BT-474 model. In vivo, ispinesib enhanced the anti-tumor activity of trastuzumab, lapatinib, doxorubicin, and capecitabine, and exhibited activity comparable to paclitaxel and ixabepilone. These findings support further clinical exploration of KSP inhibitors for the treatment of breast cancer.

  12. Influence of interstitial Mn on magnetism in room-temperature ferromagnet Mn(1+delta)Sb

    SciTech Connect (OSTI)

    Taylor, Alice E [ORNL; Berlijn, Tom [ORNL; Hahn, Steven E [ORNL; May, Andrew F [ORNL; Williams, Travis J [ORNL; Poudel, Lekhanath N [ORNL; Calder, Stuart A [ORNL; Fishman, Randy Scott [ORNL; Stone, Matthew B [ORNL; Aczel, Adam A [ORNL; Cao, Huibo [ORNL; Lumsden, Mark D [ORNL; Christianson, Andrew D [ORNL

    2015-01-01T23:59:59.000Z

    We report elastic and inelastic neutron scattering measurements of the high-TC ferromagnet Mn(1+delta)Sb. Measurements were performed on a large, TC = 434 K, single crystal with interstitial Mn content of delta=0.13. The neutron diffraction results reveal that the interstitial Mn has a magnetic moment, and that it is aligned antiparallel to the main Mn moment. We perform density functional theory calculations including the interstitial Mn, and find the interstitial to be magnetic in agreement with the diffraction data. The inelastic neutron scattering measurements reveal two features in the magnetic dynamics: i) a spin-wave-like dispersion emanating from ferromagnetic Bragg positions (H K 2n), and ii) a broad, non-dispersive signal centered at forbidden Bragg positions (H K 2n+1). The inelastic spectrum cannot be modeled by simple linear spin-wave theory calculations, and appears to be significantly altered by the presence of the interstitial Mn ions. The results show that the influence of the int

  13. St. Louis airport site annual environmental report for calendar year 1990, St. Louis, Missouri

    SciTech Connect (OSTI)

    Not Available

    1991-08-01T23:59:59.000Z

    Environmental monitoring of the US Department of Energy's (DOE) St. Louis Airport Site (SLAPS) and surrounding area began in 1984. SLAPS is part of the Formerly Utilized Sites Remedial Action Program (FUSRAP), a DOE program to decontaminate or otherwise control sites where residual radioactive materials remain from the early years of the nation's atomic energy program or from commercial operations causing conditions that Congress has authorized DOE to remedy. Monitoring results are compared with applicable Environmental Protection Agency (EPA) standards; federal, state, and local applicable or relevant and appropriate requirements (ARARs); and/or DOE derived concentration guidelines (DCGs). Environmental standards, ARARs, and DCGs are established to protect public health and the environment. Results from the 1990 environmental monitoring program demonstrated that the concentrations of contaminants of concern were all below applicable standards, ARARs, and guidelines. Site activities in 1990 were limited to maintenance. SLAPS was in compliance with all applicable regulations during 1990 and has remained in compliance since 1984, when the environmental monitoring program and remedial action began.

  14. Essays on Extended Service Contracts May 1st, 2008

    E-Print Network [OSTI]

    Sadeh, Norman M.

    1 Essays on Extended Service Contracts Tao Chen Defense May 1st, 2008 #12;2 Abstract Extended service contracts have been the major profit generator for many consumer electronics retailers of extended service contracts and how the ESC purchase decisions are related to the product purchase decisions

  15. EUROPEAN STUDIES CENTRE St Antony's College University of Oxford

    E-Print Network [OSTI]

    Oxford, University of

    ) Monday 14th October 5pm ESC/SEESOX Seminar An Insider's View of Greece's Euro-crisis: Why the Road Legitimacy at Times of Crisis Claudia Schrag Sternberg (St. Hugh's, Oxford) On the occasion) #12;Week 3 Tuesday 29th October 5pm ESC Core Seminar Series The Passage to Europe: At the Heart

  16. Tax Reform in the 21st Alan J. Auerbach*

    E-Print Network [OSTI]

    Sadoulet, Elisabeth

    Tax Reform in the 21st Century Alan J. Auerbach* University of California, Berkeley, and NBER May 6 for a conference, "Is it Time for Fundamental Tax Reform?" held at the James A. Baker III Institute at Rice a major reform to make its tax system simpler, fairer and more efficient? In addressing this question, I

  17. Between Facebook and JPMorgan, Wall St. woes By PALLAVI GOGOI

    E-Print Network [OSTI]

    Belogay, Eugene A.

    Between Facebook and JPMorgan, Wall St. woes mount By PALLAVI GOGOI The Associated Press Updated: 5 public offering of Facebook stock last week, which was fumbled by the banks that managed the deal against Facebook and Morgan Stanley, the bank that shepherded the IPO, over reports that it withheld

  18. THE WHITE HOUSE Impact of March 1st

    E-Print Network [OSTI]

    : Louisiana Unless Congress acts by March 1st , a series of automatic cuts--called the sequester--will take,000 fewer students would be served and approximately 50 fewer schools would receive funding. o Education be canceled. Law Enforcement and Public Safety Funds for Crime Prevention and Prosecution: Louisiana will lose

  19. BEaST: Brain extraction using multiresolution nonlocal segmentation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    BEaST: Brain extraction using multiresolution nonlocal segmentation Simon F. Eskildsen1 Østergaard2 , D. Louis Collins1 , and the Alzheimer's Disease Neuroimaging Initiative 1 McConnell Brain. Brain extraction is an important step in the analysis of brain images. Variability in brain morphology

  20. St. Louis Sites Fact Sheet WHAT IS FUSRAP?

    E-Print Network [OSTI]

    US Army Corps of Engineers

    remediation program. It addresses radiological contamination generated by activities of the Manhattan Engineer operated as a uranium extrusion and rod-straightening facility. Contamination is now in dust located (USACE), St. Louis District, is conducting a radiological cleanup program for four Missouri sites (SLDS

  1. 21st International Conference on Ion Beam Analysis

    SciTech Connect (OSTI)

    Thevuthasan, Suntharampillai; Shutthanandan, V.; Wang, Yongqiang; Vizkelethy, Gyorgy; Rout, Bibhudutta

    2014-08-01T23:59:59.000Z

    This special issue of Nuclear Instruments and Methods in Physics Research B contains the proceedings of the 21st International Conference on Ion Beam Analysis (IBA – 2013). This conference was held in Marriott Waterfront in Seattle, Washington, USA during June 23–28, 2013.

  2. Farm Business Management for the 21st Century Purdue Extension

    E-Print Network [OSTI]

    Farm Business Management for the 21st Century Purdue Extension West Lafayette, IN 47907 The Internal Analysis of Your Farm Business: What Is Your Farms Competitive Advantage? PURDUE EXTENSION EC-721 University Assessing the strengths and weaknesses of your farm business will help you iden- tify those

  3. Farm Business Management for the 21st Century Purdue Extension

    E-Print Network [OSTI]

    Farm Business Management for the 21st Century Purdue Extension West Lafayette, IN 47907 Developing at the underlying purpose for which the business exists: its vision and mission. An important key to any successful planned vacation or like the initiation of a new business enterprise or restructuring of an existing

  4. Summary of Activities at the ST. LOUIS DOWNTOWN SITE

    E-Print Network [OSTI]

    US Army Corps of Engineers

    Ameren UE Cash Scrap Metals Cotto-Waxo Star Bedding Company Christiana Court LLC (Former) Curly Collins Salt South PSC Metals Inc. St. Louis Metropolitan Sewer District Lift Station Midtown Garage Hjersted 11 Richey Farve Tobin Electric Worth Industries Bremen Bank Eirten's Parlors UAAA Local 1887 Dillion

  5. Piton Peaks, St. Lucia 515 Caribbean Discovery V1

    E-Print Network [OSTI]

    Connor, Ed

    · · · · · #12;V1 Piton Peaks, St. Lucia 515 Caribbean Discovery V1 PRSRTSTD U.S.POSTAGE PERMIT cruise the turquoise waters of the Caribbean. Sail from Miami to the beautiful island of Tortola, home beaches, and explore colorful towns as you discover the Caribbean. Cruise to celebrated ports aboard

  6. NONSINGULAR REGENERATING INFLATIONARY UNIVERSE University of Cambridge, DAMTP, Silver St.,

    E-Print Network [OSTI]

    Linde, Andrei

    July 1982 NONSINGULAR REGENERATING INFLATIONARY UNIVERSE A.D. Linde University of Cambridge, DAMTP, Silver St., .*) Cambr~dge CB3 9EW, England Abstract A new version of the inflationary universe scenario now in the inflationary universe scenario (1- 12), which may provide us with a solution of many

  7. PROCEEDINGS OF THE 31st ICRC, L ODZ 2009 1

    E-Print Network [OSTI]

    Usoskin, Ilya G.

    , Finland Abstract. Cosmogenic nuclides are produced by cosmic rays in the atmosphere and used in many research applications, such as paleoclimatology, solar activity reconstructions, dating methods, etc at altitude h, provided by the CRAC model; S(t, E) is the differential energy spectrum of cosmic rays

  8. The University of St Andrews Student Services Strategy

    E-Print Network [OSTI]

    Brierley, Andrew

    -2017 In response to demand and the developing expectations of students and staff at the University of St Andrews staff and embedded in all our staff/student interactions. These values and beliefs dominate our practice fundamentally what is best for them and their views are to be respected; others should not assume they know best

  9. Energy Systems & Climate Change The Evergreen St. College

    E-Print Network [OSTI]

    Zita, E.J.

    project · Investigate your question; test your hypotheses · Build something? Generate and/or analyze data. Reference: For each of your sources, start with the data: · Books: Title, Author, year (publisher, ISBNResearch in Energy Systems & Climate Change The Evergreen St. College Dr. E.J. Zita zita

  10. Energy: a historical perspective and 21st century forecast

    SciTech Connect (OSTI)

    Salvador, Amos [University of Texas, Austin, TX (United States)

    2005-07-01T23:59:59.000Z

    Contents are: Preface; Chapter 1: introduction, brief history, and chosen approach; Chapter 2: human population and energy consumption: the future; Chapter 4: sources of energy (including a section on coal); Chapter 5: electricity: generation and consumption; and Chapter 6: energy consumption and probable energy sources during the 21st century.

  11. University of St Andrews School of Computer Science

    E-Print Network [OSTI]

    St Andrews, University of

    mention the variable. numSupports is the number of short supports currently known to the algorithm in the current state. There is no short support that supports z 4, so this value is deleted. WhenUniversity of St Andrews School of Computer Science Exploiting Short Supports for Generalised Arc

  12. Course 2012 2013 SPANISH COURSES 1st TRIMESTER

    E-Print Network [OSTI]

    Geffner, Hector

    Course 2012 ­ 2013 SPANISH COURSES 1st TRIMESTER UPF Institutional Program (3 ECTS - 45 hours) Only the following groups are eligible to attend these UPF subsidized courses: UPF Erasmus students, UPF Exchange students, Doctoral or Masters Students with UPF teaching responsibilities and UPF teaching staff. Levels

  13. Course 2012 2013 CATALAN COURSES 1st TRIMESTER

    E-Print Network [OSTI]

    Geffner, Hector

    Course 2012 ­ 2013 CATALAN COURSES 1st TRIMESTER UPF Institutional Program (3 ECTS) This program, interns assigned to a UPF research institute and UPF teaching staff can also join the program. Levels to sit a CIFOLC exam, you must have done an UPF Languages course. OFFICIAL CATALAN CERTIFICATES www.upf

  14. Database Research: Achievements and Opportunities Into the 21st Century

    E-Print Network [OSTI]

    Ullman, Jeffrey D.

    Database Research: Achievements and Opportunities Into the 21st Century Avi Silberschatz, Mike Stonebraker, Jeff Ullman, editors Report of an NSF Workshop on the Future of Database Systems Research, May 26--27, 1995 1 1 Introduction In February of 1990, a group of database researchers met to examine the prospects

  15. Missouri S&T Residential College Learning Community

    E-Print Network [OSTI]

    Missouri-Rolla, University of

    Missouri S&T Residential College Learning Community (Revised) Special Programs Request May 20, 2008.5 credit hour courses associated with the Residential College Learning Communities. The Office of Undergraduate Studies will collaboratively share responsibility with Residential Life for each course

  16. The Rate of Creep Deformation St Edmund's College, Cambridge

    E-Print Network [OSTI]

    Cambridge, University of

    and test the significant creep constitutive strain equations, 2.25Cr-1Mo steel has been selectedThe Rate of Creep Deformation By Yi Shen St Edmund's College, Cambridge University of Cambridge my parents Liping Wei and Derong Shen. #12;v Abstract Creep and creep fracture represent one

  17. Proceeding of the 1st International Forum on Heat Transfer

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Proceeding of the 1st International Forum on Heat Transfer November 24-26, 2004, Kyoto, Japan Paper No. HEAT TRANSFER PROBLEMS RELATED WITH CARBON NANOTUBES BY MOLECULAR DYNAMICS-BASED SIMULATIONS Dynamics Simulation, Thermal Conductance ABSTRACT Several heat transfer problems related to single

  18. St Andrews Recycling Points Recycling Points are situated locally to

    E-Print Network [OSTI]

    St Andrews, University of

    St Andrews Recycling Points Recycling Points are situated locally to allow you to recycle the following materials: To find your nearest Recycling Point please visit www.fifedirect.org.uk/wasteaware or call the Recycling Helpline on 08451 55 00 22. R&A GOLF CLUB OLD COURSE HOTEL UNIVERSITY NORTH HAUGH

  19. GLOBAL STRATEGY FOR HIGHER EDUCATION IN THE 21ST Indo-US Consortium of Universities

    E-Print Network [OSTI]

    Pradhan, Anil

    and the Aligarh Muslim University launched under the Obama-Singh 21st Century Knowledge Initiative. One of its of Universities Obama-Singh 21st Century Knowledge Initiative A Proposal for Training Science

  20. WEATHERIZATION INDUSTRIES SAVE ENERGY ST SE SALEM, OREGON 97301 (503) 5691381 WEATHERIZATIONALLIES@GMAIL.COM

    E-Print Network [OSTI]

    WEATHERIZATION INDUSTRIES SAVE ENERGY 565 21ST ST SE SALEM, OREGON 97301 · (503) 5691381 · WEATHERIZATIONALLIES@GMAIL.COM COMMENTS ON ACHIEVABLE SAVINGS: A RETROSPECTIVE LOOK AT THE NORTHWEST POWER AND CONSERVATION COUNCIL'S CONSERVATION PLANNING ASSUMPTIONS Weatherization Industries Save Energy (WISE

  1. Creating the Clean Energy Jobs of the 21st Century | Department...

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

    Creating the Clean Energy Jobs of the 21st Century Creating the Clean Energy Jobs of the 21st Century Fact Sheet on clean energy jobs in Nevada Creating the Clean Energy Jobs of...

  2. Two California Schools Win the 21st U.S. Department of Energy...

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

    California Schools Win the 21st U.S. Department of Energy National Science Bowl Two California Schools Win the 21st U.S. Department of Energy National Science Bowl May 2, 2011 -...

  3. Hydrothermal synthesis and thermoelectric properties of nanostructured Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} compounds

    SciTech Connect (OSTI)

    Zhang, Yanhua [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China) [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China); Academy of Equipment Command and Technology, Beijing 102249 (China); Xu, Guiying [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China)] [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China); Mi, Jianli [Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, DK-8000 Aarhus (Denmark)] [Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, DK-8000 Aarhus (Denmark); Han, Fei; Wang, Ze [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China)] [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China); Ge, Changchun, E-mail: ccge@mater.ustb.edu.cn [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China)] [Institute of Special Ceramics and Powder Metallurgy, University of Science and Technology Beijing, No. 30, Xueyuan Road, Beijing 100083 (China)

    2011-05-15T23:59:59.000Z

    Research highlights: {yields} Single-phase Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} powders have been synthesized by a hydrothermal route. {yields} Hexagonal Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} naosheets due to the anisotropic growth of the crystals. {yields} The temperature gradients lead to directional arrangement nanosheet-agglomerates. {yields} Nanosheet-agglomerates are beneficial for improving the TE property of products. {yields} A maximum figure of merit of 0.86 is achieved at about 100 {sup o}C. -- Abstract: Single-phase Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} compounds have been prepared by hydrothermal synthesis at 150 {sup o}C for 24 h using SbCl{sub 3}, BiCl{sub 3} and tellurium powder as precursors. X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) have been applied to analyze the phase distributions, microstructures and grain sizes of the as-grown Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} products. It is found that the hydrothermally synthesized Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} nanopowders have a morphology dominated by irregular hexagonal sheets due to the anisotropic growth of the crystals. The Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} nanosheets are parallelly stacked in certain direction to form sheet-agglomerates attribute to the temperature gradients in the solution.

  4. Urban League of St. Louis Ramps Up Weatherization Production and Hiring

    Broader source: Energy.gov [DOE]

    Why some residents in St. Louis are doing a double take when looking at the savings on their energy bills.

  5. s.t F E V, (V \\F) E B, m(B\\A) = 0

    E-Print Network [OSTI]

    Ishii, Hitoshi

    Rk : k- (Cc(Rk ) ) 1 X M µ (a) E M > 0, F : , V : s.t F E V, µ(V \\F) E M A : F , B : G s.t A E B, m(B\\A) = 0 2 X s.t (K) ) : a Pn} Rk (= ) box( n=1 n) [Rk ] Rk - M M m (a) M E M A : F, B : G s.t A E B, m(B\\A) = 0 (b) m

  6. ESA's Programme of Exploration 1st June Aurora Industry Day 1

    E-Print Network [OSTI]

    ESA's Programme of Exploration 1st June Aurora Industry Day 1 Aurora Core Programme Approach Proposed for Mars Sample Return Preparation Aurora Industry Day ­ 1st June 2006 A. PRADIER #12;ESA's Programme of Exploration 1st June Aurora Industry Day 2 OVERALL MSR CONTEXT MARS SAMPLE RETURN Represents

  7. Ground-level ozone in the 21st century: future trends,

    E-Print Network [OSTI]

    Ground-level ozone in the 21st century: future trends, impacts and policy implications October 2008. Courtesy of Dr Mhairi Coyle, CEH Edinburgh. #12;Ground-level ozone in the 21st century: future trends Limited #12;Ground-level ozone in the 21st century I October 2008 I iiiThe Royal Society Ground

  8. CONFIGURATION AND MAINTENANCE OF THE ARIES-ST POWER PLANT X.R. Wang,a

    E-Print Network [OSTI]

    CONFIGURATION AND MAINTENANCE OF THE ARIES-ST POWER PLANT X.R. Wang,a M.S. Tillack,a F ARIES-ST is a 1000 MWe fusion power plant based on a low aspect ratio "spherical torus" (ST) plasma availability of the power plant. Mechanical joints are poss- ible in the normal conducting single-turn toroidal

  9. CONFIGURATION AND MAINTENANCE OF THE ARIES-ST POWER PLANT X.R. Wang,a

    E-Print Network [OSTI]

    Najmabadi, Farrokh

    CONFIGURATION AND MAINTENANCE OF THE ARIES-ST POWER PLANT X.R. Wang,a M.S. Tillack,a F Abstract- ARIES-ST is a 1000 MWe fusion power plant based on a low aspect ratio "spherical torus" (ST availability of the power plant. Mechanical joints are possible in the normal conducting single-turn toroidal

  10. Environmental Assessment on the leasing of the Strategic Petroleum Reserve, St. James Terminal, St. James Parish, Louisiana

    SciTech Connect (OSTI)

    NONE

    1995-01-01T23:59:59.000Z

    The US Department of Energy (DOE) proposes to lease the Strategic Petroleum Reserve`s (SPR) St. James Terminal to private industry. The St. James Terminal consists of six storage tanks, a pumping station, two maine docks and ancillary facilities. DOE believes that the St. James Terminal presents an opportunity to establish a government- industry arrangement that could more effectively use this asset to serve the nations`s oil distribution needs, reduce the operational cost of the SPR, and provide a source of revenue for the Government. DOE solicited interest in leasing its distribution facilities in a notice published March 16, 1994. In response, industry has expressed interest in leasing the St. James Terminal, as well as several DOE pipelines, to enhance the operation of its own facilities or to avoid having to construct new ones. Under such a lease, industry use would be subordinate to DOE use in the event of a national energy emergency. This Environmental Assessment describes the proposed leasing operation, its alternatives, and potential environmental impacts. Based on this analyses, DOE has determined that the proposed action is not a major Federal action significantly affecting the quality of the human environment within the meaning of the National Environmental Policy Act (NEPA) OF 1969 and has issued the Finding of No Significant Impact (FONSI).

  11. The effects of the chemical composition and strain on the electronic properties of GaSb/InAs core-shell nanowires

    SciTech Connect (OSTI)

    Ning, Feng; Wang, Dan; Tang, Li-Ming, E-mail: lmtang@hnu.edu.cn; Zhang, Yong; Chen, Ke-Qiu, E-mail: keqiuchen@hnu.edu.cn [Department of Applied Physics, Hunan University, Changsha 410082 (China)

    2014-09-07T23:59:59.000Z

    The effects of the chemical composition and strain on the electronic properties of [111] zinc-blende (ZB) and [0001] wurtzite (WZ) GaSb/InAs core-shell nanowires (NWs) with different core diameters and shell thicknesses are studied using first-principles methods. The band structures of the [111] ZB GaSb/InAs core-shell NWs underwent a noticeable type-I/II band alignment transition, associated with a direct-to-indirect band gap transition under a compressive uniaxial strain. The band structures of the [0001] WZ GaSb/InAs core-shell NWs preserved the direct band gap under either compressive or tensile uniaxial strains. In addition, the band gaps and the effective masses of the carriers could be tuned by their composition. For the core-shell NWs with a fixed GaSb-core size, the band gaps decreased linearly with an increasing InAs-shell thickness, caused by the significant downshift of the conduction bands. For the [111] ZB GaSb/InAs core-shell NWs, the calculated effective masses indicated that the transport properties could be changed from hole-dominated conduction to electron-dominated conduction by changing the InAs-shell thickness.

  12. Highly tunable electron transport in epitaxial topological insulator (Bi{sub 1-x}Sb{sub x}){sub 2}Te{sub 3} thin films

    SciTech Connect (OSTI)

    He Xiaoyue; Guan Tong; Wang Xiuxia; Feng Baojie; Cheng Peng; Chen Lan; Li Yongqing; Wu Kehui [Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190 (China)

    2012-09-17T23:59:59.000Z

    Atomically smooth, single crystalline (Bi{sub 1-x}Sb{sub x}){sub 2}Te{sub 3} films have been grown on SrTiO{sub 3}(111) substrates by molecular beam epitaxy. A full range of Sb-Bi compositions have been studied in order to obtain the lowest possible bulk conductivity. For the samples with optimized Sb compositions (x=0.5{+-}0.1), the carrier type can be tuned from n-type to p-type across the whole thickness with the help of a back-gate. Linear magnetoresistance has been observed at gate voltages close to the maximum in the longitudinal resistance of a (Bi{sub 0.5}Sb{sub 0.5}){sub 2}Te{sub 3} sample. These highly tunable (Bi{sub 1-x}Sb{sub x}){sub 2}Te{sub 3} thin films provide an excellent platform to explore the intrinsic transport properties of the three-dimensional topological insulators.

  13. Interfacial structure, bonding and composition of InAs and GaSb thin films determined using coherent Bragg rod analysis.

    SciTech Connect (OSTI)

    Cionca, C.; Walko, D. A.; Yacoby, Y.; Dorin, C.; Millunchick, J. M.; Clarke, R.; X-Ray Science Division; Univ. of Michigan; Hebrew Univ.

    2007-01-01T23:59:59.000Z

    We have used Bragg rod x-ray diffraction combined with a direct method of phase retrieval to extract atomic resolution electron-density maps of a complementary series of heteroepitaxial III-V semiconductor samples. From the three-dimensional electron-density maps we derive the monolayer spacings, the chemical compositions, and the characteristics of the bonding for all atomic planes in the film and across the film-substrate interface. InAs films grown on GaSb(001) under two different As conditions (using dimer or tetramer forms) both showed conformal roughness and mixed GaAs/InSb interfacial bonding character. The As tetramer conditions favored InSb bonding at the interface while, in the case of the dimer, the percentages corresponding to GaAs and InSb bonding were equal within the experimental error. The GaSb film grown on InAs(001) displayed significant In and As interdiffusion and had a relatively large fraction of GaAs-like bonds at the interface.

  14. Emission properties of heterostructures with a (GaAsSb-InGaAs)/GaAs bilayer quantum well

    SciTech Connect (OSTI)

    Zvonkov, B. N.; Nekorkin, S. M.; Vikhrova, O. V.; Dikareva, N. V., E-mail: dikareva@nifti.unn.ru [Nizhni Novgorod State University, Physical-Technical Research Institute (Russian Federation)

    2013-09-15T23:59:59.000Z

    The specific features of the emission characteristics of GaAs-based heterostructures with a GaAs{sub 1-x}Sb{sub x}-In{sub y}Ga{sub 1-y}As bilayer quantum well are studied. The heterostructures are grown by metal-organic chemical vapor deposition (MOCVD). With an analysis of previously reported data on the MOCVD growth process taken into account, the temperature range (560-580 Degree-Sign C), the relation between the fluxes emitted by the sources of Group-V and -III elements ( Less-Than-Or-Equivalent-To 1), and the order of layer growth for the production of the active region of a GaAs/InGaP laser heterostructure are determined experimentally. The active region is a GaAs{sub 0.75}Sb{sub 0.25}-In{sub 0.2}Ga{sub 0.8}As bilayer quantum well. For the structure, a 1075-nm electroluminescence signal attributed to indirect transitions between the valence band of the GaAs{sub 0.75}Sb{sub 0.25} layer and the conduction band of the In{sub 0.2}Ga{sub 0.8}As layer is observed. An increase in the continuous-wave pump current yields a decrease in the 1075-nm emission intensity and initiates stable lasing at a wavelength of 1022 nm at a threshold current density of 1.4 kA cm{sup -2} at room temperature. Lasing occurs at transitions direct in coordinate space.

  15. Transport properties of partially-filled Ce{sub y}Co{sub 4}Sb{sub 12}

    SciTech Connect (OSTI)

    Uher, C.; Chen, B.; Hu, S.; Morelli, D.T.; Meisner, G.P.

    1997-07-01T23:59:59.000Z

    The authors have investigated the magnetic and transport properties of Ce{sub y}Co{sub 4}Sb{sub 12} filled skutterudites with the filling fraction y {le} 0.1. These compounds are n-type materials that develop a magnetic moment upon the presence of trivalent cerium. Cerium has a strong influence on all transport properties and even in small amounts it drastically reduces the lattice thermal conductivity. The resulting figures of merit are comparable to the values established previously for the p-type filled skutterudites.

  16. Waveguide effect of GaAsSb quantum wells in a laser structure based on GaAs

    SciTech Connect (OSTI)

    Aleshkin, V. Ya. [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation)] [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation); Afonenko, A. A. [Belarussian State University (Belarus)] [Belarussian State University (Belarus); Dikareva, N. V. [Research Physical-Technical Institute of Nizhni Novgorod State University (Russian Federation)] [Research Physical-Technical Institute of Nizhni Novgorod State University (Russian Federation); Dubinov, A. A., E-mail: sanya@ipm.sci-nnov.ru; Kudryavtsev, K. E.; Morozov, S. V. [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation)] [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation); Nekorkin, S. M. [Research Physical-Technical Institute of Nizhni Novgorod State University (Russian Federation)] [Research Physical-Technical Institute of Nizhni Novgorod State University (Russian Federation)

    2013-11-15T23:59:59.000Z

    The waveguide effect of GaAsSb quantum wells in a semiconductor-laser structure based on GaAs is studied theoretically and experimentally. It is shown that quantum wells themselves can be used as waveguide layers in the laser structure. As the excitation-power density attains a value of 2 kW/cm{sup 2} at liquid-nitrogen temperature, superluminescence at the wavelength corresponding to the optical transition in bulk GaAs (at 835 nm) is observed.

  17. Manifestation of the Purcell effect in the conductivity of InAs/AlSb short-period superlattices

    SciTech Connect (OSTI)

    Kagan, M. S., E-mail: kagan@cplire.ru; Altukhov, I. V. [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation)] [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation); Baranov, A. N. [Universite Montpellier 2, Institute d'Electronique du Sud (France)] [Universite Montpellier 2, Institute d'Electronique du Sud (France); Il'inskaya, N. D. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Paprotskiy, S. K. [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation)] [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation); Teissier, R. [Universite Montpellier 2, Institute d'Electronique du Sud (France)] [Universite Montpellier 2, Institute d'Electronique du Sud (France); Usikova, A. A. [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation)] [Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation)

    2013-11-15T23:59:59.000Z

    Vertical transport in short-period InAs/AlSb superlattices with type-II heterojunctions is studied at room temperature. It is found that negative differential conductivity appears in the miniband-conduction mode upon the overlapping of quantum-confined states in a periodic system of quantum wells. In the nonresonant-tunneling mode, equidistant peaks appear on the current-voltage characteristic of these superlattices. These peaks are attributed to the influence of the optical cavity on optical electron transitions in quantum wells (Purcell effect)

  18. Low-temperature transport properties of the mixed-valence semiconductor Ru{sub 0.5}Pd{sub 0.5}Sb{sub 3}

    SciTech Connect (OSTI)

    Nolas, G.S. [Research and Development Division, Marlow Industries, Dallas, Texas 75238 (United States)] [Research and Development Division, Marlow Industries, Dallas, Texas 75238 (United States); Harris, V.G.; Tritt, T.M. [Materials Physics Branch, Naval Research Laboratory, Washington, DC 20375 (United States)] [Materials Physics Branch, Naval Research Laboratory, Washington, DC 20375 (United States); Slack, G.A. [Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)] [Department of Physics, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

    1996-12-01T23:59:59.000Z

    We have measured the transport properties of Ru{sub 0.5}Pd{sub 0.5}Sb{sub 3} from 300 down to 4 K and compared them to those of the binary-skutterudite antimonides. In particular, the lattice thermal conductivity of this compound is substantially lower than that of CoSb{sub 3} and IrSb{sub 3}. This is attributed to the mixed-valency of ruthenium in this compound. Using near-edge extended absorption fine structure analysis, it is observed that ruthenium in this compound is in the Ru{sup 4+}- and Ru{sup 2+}-valence states in approximately equal proportions. The potential for thermoelectric applications of this material is also discussed. {copyright} {ital 1996 American Institute of Physics.}

  19. Dependence of the ground-state transition energy versus optical pumping in GaAsSb/InGaAs/GaAs heterostructures

    SciTech Connect (OSTI)

    Morozov, S. V.; Kryzhkov, D. I., E-mail: krizh@ipmras.ru; Aleshkin, V. Ya. [Institute for Physics of Microstructures, RAS, 603950 Nizhny Novgorod (Russian Federation); Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod (Russian Federation); Yablonsky, A. N.; Krasilnik, Z. F. [Institute for Physics of Microstructures, RAS, 603950 Nizhny Novgorod (Russian Federation); Zvonkov, B. N.; Vikhrova, O. V. [Physical-Technical Research Institute, Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod (Russian Federation)

    2014-01-13T23:59:59.000Z

    In this work, we report on the time-resolved photoluminescence studies of a double quantum well In{sub 0.2}Ga{sub 0.8}As/GaAs{sub 0.8}Sb{sub 0.2}/GaAs heterostructure which, in contrast to the GaAsSb/GaAs structures, is expected to provide effective confinement of electrons due to additional InGaAs layer. The studies at 4.2?K have revealed a complicated nonmonotonic dependence of the ground-state transition energy on the concentration of nonequilibrium charge carriers in the quantum well. The effect observed in this work is important in terms of creating sources of radiation, including stimulated emission, on the basis of InGaAs/GaAsSb/GaAs structures.

  20. Christopher St German on Scripture, Councils, and Monarchs

    E-Print Network [OSTI]

    Rex, Richard

    2014-01-01T23:59:59.000Z

    brushes aside the delicate theological work of Ephesus, Chalcedon, Constantinople II, etc. St German concludes from this that ‘all Cristen kinges ar boundon in conscience to serche and examyn with all diligence whether the contreyes that I haue named... ’). The Institution, in turn, explicitly endorses the ‘foure holy councelles’ (Nicaea, Constantinople, Ephesus, and Chalcedon), as well as (less specifically) ‘all other syth that tyme in any pointe consonante to the same’ (fol.18r-v). If one supposes...

  1. 44 Market St - Refurbishment of a Dual Duct Building

    E-Print Network [OSTI]

    Bannister, P.; Foo, G.

    2013-01-01T23:59:59.000Z

    Page 1 of 9 44 MARKET ST ? REFURBISHMENT OF A DUAL DUCT BUILDING ? ? DR PAUL BANNISTER Managing Director Exergy Australia Pty Ltd Canberra, ACT, Australia GRACE FOO Consultant Exergy Australia Pty Ltd Canberra, ACT, Australia ? ABSTRACT...-zone dual duct unit with a single supply fan and separate cooling and heating coils serving the retail bank and optometrist tenancies. AHU-6 (caf?) was a constant volume system equipped with cooling and heating coils. AHU-B1 (Australia Post on Basement...

  2. DOE pollution prevention in the 21st century

    SciTech Connect (OSTI)

    NONE

    1996-10-01T23:59:59.000Z

    This document presents abstracts of the topics covered in the DOE Pollution Prevention in the 21st Century conference held July 9-11, 1996. These topics include: model facilities; Federal/NEPA/stake- holders; microchemistry; solvents and reduction; education and outreach; return on investments; energy management; decontamination and decommissioning; planning and regulations; environmental restoration; recycling; affirmative procurement in the executive branch; construction and demolition; materials exchange; and ISO 2000.

  3. St. Petersburg Conference on Physics of Neutron Stars, 2001

    E-Print Network [OSTI]

    A. Koptsevich

    2001-06-24T23:59:59.000Z

    The Programme and Abstracts booklet of the sixth Conference on "Physics of Neutron Stars" held at the Ioffe Physical Technical Institute, St. Petersburg, Russia, on June 6 -- 8, 2001 is presented. The abstracts contain references to the web pages, LANL archive and published articles. More information on the Conference can be found at http://www.ioffe.rssi.ru/astro/NS2001/index.html

  4. Welcome'to'St'Andrews' First'Year'Computer'Science'

    E-Print Network [OSTI]

    St Andrews, University of

    ,'is'a'slang'term'used'to'reference' a'scenario'in'which'a'company'(usually,'a' computer'soQware'company)'uses'its'own' product'since'not'much'changed'each'year '' ­Though%we%did%listen%to%feedback% ­And%improved%in%certain%areas% · We'deduce'that'...' · Computer'to'demonstrate'the'quality'and' capabiliDes'of'the'product."' ­Wikipedia' #12;Dogfood...'' · Graham'Kirby' · BSc'St'Andrews' · Ph

  5. St. Joseph County, Michigan: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries Pvt LtdShawangunk,SoutheastSt. Francis County, Arkansas:

  6. St. Tammany Parish, Louisiana: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries Pvt LtdShawangunk,SoutheastSt. Francis County,

  7. Crystallographic analysis of the structure of livingstonite HgSb{sub 4}S{sub 8} from refined data

    SciTech Connect (OSTI)

    Borisov, S. V., E-mail: borisov@che.nsk.su; Pervukhina, N. V.; Magarill, S. A.; Kuratieva, N. V. [Russian Academy of Sciences, Nikolaev Institute of Inorganic Chemistry, Siberian Branch (Russian Federation); Vasil'ev, V. I., E-mail: itret@uiggm.nsc.ru [Russian Academy of Sciences, Institute of Geology and Mineralogy, Siberian Branch (Russian Federation)

    2010-03-15T23:59:59.000Z

    An X-ray diffraction study of mineral livingstonite (HgSb{sub 4}S{sub 8}) from Khaydarkan (Kyrgyzstan) has been performed on a Bruker Nonius X8Apex diffractometer with a 4K CCD detector (R = 0.031). The unit-cell parameters were found to be a = 30.1543(10) A, b = 3.9953(2) A, c = 21.4262(13) A, {beta} = 104.265(1){sup o}, V = 2501.7(2) A{sup 3}, Z = 8, d{sub calcd} = 5.013 g/cm{sup 3}, and sp. gr. A2/a. It was confirmed that livingstonite belongs to rod-layers structures. In one type of layer, two double Sb{sub 2}S{sub 4} chains are bound by disulfide groups [S{sub 2}]{sup 2-} (S-S 2.078(2) A); in the other type, these chains are bound via Hg{sup 2+} cations. A crystallographic analysis confirmed the existence of independent pseudotranslational ordering in the cation and anion matrices, which is characteristic of the lozenge-like structures of sulfides and sulfosalts.

  8. Study of a 1?eV GaNAsSb photovoltaic cell grown on a silicon substrate

    SciTech Connect (OSTI)

    Tan, K. H.; Loke, W. K.; Wicaksono, S.; Li, D.; Leong, Y. R.; Yoon, S. F. [School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore)] [School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore); Sharma, P.; Milakovich, T.; Bulsara, M. T.; Fitzgerald, E. A. [Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139 (United States)] [Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139 (United States)

    2014-03-10T23:59:59.000Z

    We report the performance of a 1?eV GaNAsSb photovoltaic cell grown on a Si substrate with a SiGe graded buffer grown using molecular beam epitaxy. For comparison, the performance of a similar 1?eV GaN{sub 0.018}As{sub 0.897}Sb{sub 0.085} photovoltaic cell grown on a GaAs substrate was also reported. Both devices were in situ annealed at 700?°C for 5?min, and a significant performance improvement over our previous result was observed. The device on the GaAs substrate showed a low open circuit voltage (V{sub OC}) of 0.42?V and a short circuit current density (J{sub SC}) of 23.4?mA/cm{sup 2} while the device on the Si substrate showed a V{sub OC} of 0.39?V and a J{sub SC} of 21.3?mA/cm{sup 2}. Both devices delivered a quantum efficiency of 50%–55% without any anti-reflection coating.

  9. Evolution of glass properties during a substitution of S by Se in Ge28Sb12S60-xSex glass Guillaume Guery1,2

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Evolution of glass properties during a substitution of S by Se in Ge28Sb12S60-xSex glass network, Université de Bordeaux I, Avenue du Dr Schweitzer, 33608 Pessac Cedex, France. Keywords: Chalcogenide glass; Raman spectroscopy; X-ray photoelectron spectroscopy; Glass properties Author whom correspondence should

  10. Confirmatory Survey Report for Area B1S/B2S at the Chevron Mining Washington Remediation Project, Washington, PA

    SciTech Connect (OSTI)

    W. C. Adams

    2007-11-20T23:59:59.000Z

    During the period of October 2 and 3, 2007, the Oak Ridge Institute for Science and Education (ORISE) performed confirmatory radiological survey activities which included gamma surface scans within Area B1S/B2S and the collection of soil samples from these areas.

  11. Ultrafast terahertz-induced response of GeSbTe phase-change materials Michael J. Shu,1,2,a)

    E-Print Network [OSTI]

    Ultrafast terahertz-induced response of GeSbTe phase-change materials Michael J. Shu,1,2,a) Peter-optically, pumping with single-cycle terahertz pulses as a means of biasing phase-change materials on a sub of these materials is important for predicting the field-driven heating and phase-change behavior. However

  12. Jimmy Krozel is with Metron Aviation, Inc., Herndon, VA. Changkil Lee and Joseph S.B. Mitchell are with Stony Brook University, Stony Brook, NY.

    E-Print Network [OSTI]

    Mitchell, Joseph S.B.

    [Federal Aviation Administration, 2003]) lists weather as the leading cause (65% to 75%) of delays greater inclement weather, throughput is adversely affected. The Aviation Capacity Enhancement Plan (FAA ACE Plan. Jimmy Krozel is with Metron Aviation, Inc., Herndon, VA. Changkil Lee and Joseph S.B. Mitchell

  13. Zintl Phases as Thermoelectric Materials: Tuned Transport Properties of the Compounds CaxYb1xZn2Sb2**

    E-Print Network [OSTI]

    Zintl Phases as Thermoelectric Materials: Tuned Transport Properties of the Compounds CaxYb1±xZn2Sb. Introduction Because of their ability to convert waste heat into electricity, thermoelectric materials have in efficiency, thermoelectric materials could pro- vide a substantial amount of electrical power from automotive

  14. Thermoelectric Properties of n-type Polycrystalline BixSb2-xTe3 Alloys N. Gerovac, G. J. Snyder, and T. Caillat

    E-Print Network [OSTI]

    Thermoelectric Properties of n-type Polycrystalline BixSb2-xTe3 Alloys N. Gerovac, G. J. Snyder their atomic composition. The thermoelectric properties were measured at room temperature in both directions. The thermoelectric figure-of-merit, ZT, was calculated from these properties. The best ZT was ~.5, given by annealed

  15. Compositionally-graded InGaAsInGaP alloys and GaAsSb alloys for metamorphic InP on GaAs

    E-Print Network [OSTI]

    Compositionally-graded InGaAs­InGaP alloys and GaAsSb alloys for metamorphic InP on GaAs Li Yang a of tandem graded layers of InGaAs and InGaP with compositional grading of the In concentration. This tandem

  16. Vapor explosion in the RIA-ST-4 experiment. [BWR

    SciTech Connect (OSTI)

    El-Genk, M.S.

    1980-01-01T23:59:59.000Z

    A concern in assuring the safety of commercial light water reactors (LWRs) is whether core overheating, during which molten fuel is produced, can lead to massive vaporization of the coolant and shock pressurization of the system due to an energetic molten fuel-coolant interaction (MFCI). The RIA-ST-4 experiment was one of four scoping tests in the Reactivity Initiated Accident (RIA) Test Series which is being conducted in the Power Burst Facility (PBF) to define an energy deposition failure threshold and to determine modes and consequences of fuel rod failure during a postulated boiling water reactor (BWR) control rod drop accident.

  17. Building a 21st Century Electric Grid | Department of Energy

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

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  18. Florida's 21st congressional district: Energy Resources | Open Energy

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  19. Cape St. Claire, Maryland: Energy Resources | Open Energy Information

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  20. Shanghai ST Solar Technology Co Ltd | Open Energy Information

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  1. SL/ST Performance Management Training | Department of Energy

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011 Strategic2 OPAM615_CostNSARDevelopmental Assignment |SHEPHERDS FLATSL/ST Performance

  2. 1st Quarter 2015 Domestic Uranium Production Report

    Gasoline and Diesel Fuel Update (EIA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for On-Highway4,1,50022,3,,,,6,1,9,1,50022,3,,,,6,1,Decade Year-0E (2001)gasoline prices4 Oil demand8) JunePercent2014 1st

  3. PP-99 St. Clair Tunnel Company | Department of Energy

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

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  4. St. Louis Launches Plan for More Sustainable Community | Department of

    Office of Environmental Management (EM)

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  5. Utah's 1st congressional district: Energy Resources | Open Energy

    Open Energy Info (EERE)

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  6. California's 51st congressional district: Energy Resources | Open Energy

    Open Energy Info (EERE)

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  10. City of St John, Kansas (Utility Company) | Open Energy Information

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  11. City of St Marys, Kansas (Utility Company) | Open Energy Information

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  13. City of St Paul, Nebraska (Utility Company) | Open Energy Information

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  14. MHK Projects/Humber St Andrews | Open Energy Information

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  15. Annual Energy Outlook 2015 1st Coal Working Group

    Gasoline and Diesel Fuel Update (EIA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for On-Highway4,1,50022,3,,,,6,1,9,1,50022,3,,,,6,1,Decade Energy IDecade Year-0 Year-1 Year-2CubicElectricity Analysis Team1 st

  16. Program Update: 1st Quarter 2010 | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of ContaminationHubs+ Report Presentation:in the U.S. by6Energy ProgramProgram1st

  17. St. Francis County, Arkansas: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

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  18. St. Francois County, Missouri: Energy Resources | Open Energy Information

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  19. St. George, Florida: Energy Resources | Open Energy Information

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  20. St. George, Maine: Energy Resources | Open Energy Information

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  1. St. George, Vermont: Energy Resources | Open Energy Information

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  2. St. Helena Parish, Louisiana: Energy Resources | Open Energy Information

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  3. St. James Parish, Louisiana: Energy Resources | Open Energy Information

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  4. St. James, Missouri: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries Pvt LtdShawangunk,SoutheastSt. Francis County, Arkansas: EnergyHelena

  5. St. James, New York: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

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  6. St. John the Baptist Parish, Louisiana: Energy Resources | Open Energy

    Open Energy Info (EERE)

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  7. St. Johns County, Florida: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

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  8. St. Johns, Arizona: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

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  9. St. Kitts and Nevis-Caribbean Community (CARICOM) Sustainable Energy

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  10. St. Landry Parish, Louisiana: Energy Resources | Open Energy Information

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  11. St. Louis City County, Missouri: Energy Resources | Open Energy Information

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  12. St. Louis County, Missouri: Energy Resources | Open Energy Information

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  13. St. Louis Park, Minnesota: Energy Resources | Open Energy Information

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  14. St. Louis, Oklahoma: Energy Resources | Open Energy Information

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  15. St. Louisville, Ohio: Energy Resources | Open Energy Information

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  16. St. Lucie County, Florida: Energy Resources | Open Energy Information

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  17. St. Martin Parish, Louisiana: Energy Resources | Open Energy Information

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  18. St. Mary Parish, Louisiana: Energy Resources | Open Energy Information

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  19. St. Mary's County, Maryland: Energy Resources | Open Energy Information

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  20. St. Mary's Hospital Space Heating Low Temperature Geothermal Facility |

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  1. St. Marys, Ohio: Energy Resources | Open Energy Information

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  2. St. Michaels, Arizona: Energy Resources | Open Energy Information

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  3. St. Nazianz, Wisconsin: Energy Resources | Open Energy Information

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  4. North St. Paul, Minnesota: Energy Resources | Open Energy Information

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  5. Northeast St. Louis, Minnesota: Energy Resources | Open Energy Information

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  6. Northwest St. Louis, Minnesota: Energy Resources | Open Energy Information

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  7. Village St. George, Louisiana: Energy Resources | Open Energy Information

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  8. City of St Charles, Minnesota (Utility Company) | Open Energy Information

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  9. City of St Clairsville, Ohio (Utility Company) | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand JumpConceptual Model, clickInformation Smyrna Beach, FloridaCityRuston,CitySoda Springs,CityStCity

  10. High-Temperature Thermoelectric Properties of the Solid–Solution Zintl Phase Eu11Cd6Sb12–xAsx (x < 3)

    SciTech Connect (OSTI)

    Kazem, Nasrin; Xie, Weiwei; Ohno, Saneyuki; Zevalkink, Alexandra; Miller, Gordon J; Snyder, G Jeffrey; Kauzlarich, Susan M

    2014-02-11T23:59:59.000Z

    Zintl phases are compounds that have shown promise for thermoelectric applications. The title solid–solution Zintl compounds were prepared from the elements as single crystals using a tin flux for compositions x = 0, 1, 2, and 3. Eu11Cd6Sb12–xAsx (x < 3) crystallize isostructurally in the centrosymmetric monoclinic space group C2/m (no. 12, Z = 2) as the Sr11Cd6Sb12 structure type (Pearson symbol mC58). Efforts to make the As compositions for x exceeding ?3 resulted in structures other than the Sr11Cd6Sb12 structure type. Single-crystal X-ray diffraction indicates that As does not randomly substitute for Sb in the structure but is site specific for each composition. The amount of As determined by structural refinement was verified by electron microprobe analysis. Electronic structures and energies calculated for various model structures of Eu11Cd6Sb10As2 (x = 2) indicated that the preferred As substitution pattern involves a mixture of three of the six pnicogen sites in the asymmetric unit. In addition, As substitution at the Pn4 site opens an energy gap at the Fermi level, whereas substitution at the other five pnicogen sites remains semimetallic with a pseudo gap. Thermoelectric properties of these compounds were measured on hot-pressed, fully densified pellets. Samples show exceptionally low lattice thermal conductivities from room temperature to 775 K: 0.78–0.49 W/mK for x = 0; 0.72–0.53 W/mK for x = 1; and 0.70–0.56 W/mK for x = 2. Eu11Cd6Sb12 shows a high p-type Seebeck coefficient (from +118 to 153 ? V/K) but also high electrical resistivity (6.8 to 12.8 m?·cm). The value of zT reaches 0.23 at 774 K. The properties of Eu11Cd6Sb12–xAsx are interpreted in discussion with the As site substitution.

  11. ST JOURNAL OF RESEARCH -VOLUME 2 -NUMBER 1 -NETWORKED MULTIMEDIA 4 COPYRIGHT LEONARD KLEINROCK, 2005

    E-Print Network [OSTI]

    Kleinrock, Leonard

    ST JOURNAL OF RESEARCH - VOLUME 2 - NUMBER 1 - NETWORKED MULTIMEDIA 4 COPYRIGHT © LEONARD KLEINROCK, 2005 Leonard Kleinrock Computer Science Department - University of California, Los Angeles A VISION

  12. Degree Year Name Position Organization Location 1997 Andrew Hall Research Director Siemens St. Louis

    E-Print Network [OSTI]

    Stormo, Gary

    Degree Year Name Position Organization Location 1997 Andrew Hall Research Director Siemens St Hongyu An Faculty UNC Chapel Hill, NC 2001 Randolph Setser Manager Research CollaborationsSiemens

  13. Looking Ahead - Biofuels, H2, & Vehicles: 21st Industry Growth Forum

    SciTech Connect (OSTI)

    Gardner, D.

    2008-10-28T23:59:59.000Z

    This presentation on the future of biofuels, hydrogen, and hybrid vehicles was presented at NREL's 21st Industry Growth Forum in Denver, Colorado, on October 28, 2008.

  14. angioplasty-treated st-elevation myocardial: Topics by E-print...

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

    in ST elevation myocardial infarction (STEMI) patients. Paramedics obtaining a 12 lead electrocardiogram (ECG) in the field (more) Meadows-Pitt, Mary S. 2012-01-01 11...

  15. acute st-elevation myocardial: Topics by E-print Network

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

    in ST elevation myocardial infarction (STEMI) patients. Paramedics obtaining a 12 lead electrocardiogram (ECG) in the field (more) Meadows-Pitt, Mary S. 2012-01-01 24...

  16. DOE/BES Workshop on Clean and Efficient Combustion of 21st Century...

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

    Combustion of 21st Century Transportation Fuels Presentation given at the 2007 Diesel Engine-Efficiency & Emissions Research Conference (DEER 2007). 13-16 August, 2007,...

  17. Haaren Hall North Hall WestportNew Building BMW 54th St. Annex Getting Around

    E-Print Network [OSTI]

    Rosen, Jay

    Haaren Hall North Hall WestportNew Building BMW 54th St. Annex Getting Around 4th Edition September . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BMW · Floor 6

  18. Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface

    SciTech Connect (OSTI)

    Zhang, Haijun; /Beijing, Inst. Phys.; Liu, Chao-Xing; /Tsinghua U., Beijing; Qi, Xiao-Liang; /Stanford U., Phys. Dept.; Dai, Xi; Fang, Zhong; /Beijing, Inst. Phys.; Zhang, Shou-Cheng; /Stanford U., Phys. Dept.

    2010-02-24T23:59:59.000Z

    Topological insulators are new states of quantum matter in which surface states residing in the bulk insulating gap of such systems are protected by time-reversal symmetry. The study of such states was originally inspired by the robustness to scattering of conducting edge states in quantum Hall systems. Recently, such analogies have resulted in the discovery of topologically protected states in two-dimensional and three-dimensional band insulators with large spin-orbit coupling. So far, the only known three-dimensional topological insulator is Bi{sub x}Sb{sub 1-x}, which is an alloy with complex surface states. Here, we present the results of first-principles electronic structure calculations of the layered, stoichiometric crystals Sb{sub 2}Te{sub 3}, Sb{sub 2}Se{sub 3}, Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3}. Our calculations predict that Sb{sub 2}Te{sub 3}, Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3} are topological insulators, whereas Sb{sub 2}Se{sub 3} is not. These topological insulators have robust and simple surface states consisting of a single Dirac cone at the point. In addition, we predict that Bi{sub 2}Se{sub 3} has a topologically non-trivial energy gap of 0.3 eV, which is larger than the energy scale of room temperature. We further present a simple and unified continuum model that captures the salient topological features of this class of materials.

  19. 21st Century jobs initiative - building the foundations for a 21st Century economy. Final main report

    SciTech Connect (OSTI)

    NONE

    1995-11-01T23:59:59.000Z

    The 21st Century Jobs Initiative has been launched in the context of new realities in Washington, D.C., rapid restructuring of the US economy and accelerating changes in the makeup of the East Tennessee economy driven by these and other external economic forces. Continuing downward pressure on Federal budgets for programs that support three key institutions in the region - DOE`s Oak Ridge complex, the Tennessee Valley Authority and research programs of the University of Tennessee - are especially threatening to the region. With a large part of its economy dependent on Federal spending, the area is at risk of troublesome impacts that could ripple out from the Oak Ridge and Knoxville home of these institutions throughout the entire 15-county {open_quotes}Resource Valley.{close_quotes} As these economic forces play out in the region`s economy, important questions arise. How will East Tennessee {open_quotes}earn its living{close_quotes} in the future if the Federal government role in the economy shrinks? What kind of new industries will be formed to replace those at risk due to Federal cutbacks and economic restructuring? Where will the jobs come from for the next generation of job seekers? These are among the questions driving the 21st Century Jobs Initiative, an action-oriented program designed and implemented by local leaders in response to the economic challenges facing East Tennessee. Fortunately, the region`s economy is strong today. Unemployment is at near record lows in most counties. Moreover, leaders are increasingly aware of the threats on the horizon and are already moving to action. And the impacts from the forces at work on the economy will probably come slowly, over the next decade or so. Based on economic research and input from local leaders knowledgeable about the economy, the 21st Century Jobs Initiative has set forth a strategic economic development plan for the region.

  20. Transforming Epidemiology for 21st Century Medicine and Public Health

    SciTech Connect (OSTI)

    Khoury, Muin J [National Institutes of Health; Lam, Tram Kim [National Institutes of Health; Ioannidis, John [Stanford University; Hartge, Patricia [National Institutes of Health; Spitz, Margaret R. [Baylor College of Medicine, Huston; Buring, Julie E. [Brigham and Women's Hospital; Chanock, Stephen J. [National Institutes of Health; Tourassi, Georgia [ORNL; Zauber, Ann [Memorial Sloan-Kettering Cancer Center; Schully, Sheri D [National Institutes of Health

    2013-01-01T23:59:59.000Z

    n 2012, the National Cancer Institute (NCI) engaged the scientific community to provide a vision for cancer epidemiology in the 21st century. Eight overarching thematic recommendations, with proposed corresponding actions for consideration by funding agencies, professional societies, and the research community emerged from the collective intellectual discourse. The themes are (i) extending the reach of epidemiology beyond discovery and etiologic research to include multilevel analysis, intervention evaluation, implementation, and outcomes research; (ii) transforming the practice of epidemiology by moving toward more access and sharing of protocols, data, metadata, and specimens to foster collaboration, to ensure reproducibility and replication, and accelerate translation; (iii) expanding cohort studies to collect exposure, clinical, and other information across the life course and examining multiple health-related endpoints; (iv) developing and validating reliable methods and technologies to quantify exposures and outcomes on a massive scale, and to assess concomitantly the role of multiple factors in complex diseases; (v) integrating big data science into the practice of epidemiology; (vi) expanding knowledge integration to drive research, policy, and practice; (vii) transforming training of 21st century epidemiologists to address interdisciplinary and translational research; and (viii) optimizing the use of resources and infrastructure for epidemiologic studies. These recommendations can transform cancer epidemiology and the field of epidemiology, in general, by enhancing transparency, interdisciplinary collaboration, and strategic applications of new technologies. They should lay a strong scientific foundation for accelerated translation of scientific discoveries into individual and population health benefits.

  1. Atomic intermixing and interface roughness in short-period InAs/GaSb superlattices for infrared photodetectors

    SciTech Connect (OSTI)

    Ashuach, Y.; Lakin, E.; Kaufmann, Y. [Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa 32000 (Israel); Saguy, C. [Solid State Institute, Technion—Israel Institute of Technology, Haifa 32000 (Israel); Zolotoyabko, E., E-mail: zloto@tx.technion.ac.il [Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa 32000 (Israel); Solid State Institute, Technion—Israel Institute of Technology, Haifa 32000 (Israel)

    2014-09-28T23:59:59.000Z

    A set of advanced characterization methods, including high-resolution X-ray diffraction (measurements and simulations), cross-sectional scanning tunneling microscopy, and high-angle annular dark-field scanning transmission electron microscopy is applied to quantify the interface roughness and atomic intermixing (in both cation and anion sub-lattices) in short period (6–7?nm) InAs/GaSb superlattices intended for mid-wavelength (M) and long-wavelength (L) infrared detectors. The undesired atomic intermixing and interface roughness in the L-samples were found to be considerably lower than in the M-samples. In all specimens, anion intermixing is much higher than that in the cation sub-lattice. Possible origins of these findings are discussed.

  2. Proposal for a second-generation, lattice matched, multiple junction Ga{sub 2}AsSb TPV converter

    SciTech Connect (OSTI)

    Horner, G.S. [Keithley Instruments, Solon Ohio (United States); Coutts, T.J.; Wanlass, M.W. [National Renewable Energy Laboratory, Golden Colorado (United States)

    1995-01-05T23:59:59.000Z

    First order device modeling is used to show that spontaneously ordered Ga{sub 2}AsSb may prove useful in the newly-active field of thermophotovoltaic power generation. Optimal band gaps for single-, double- and triple-junction III-V devices are presented for a range of blackbody emitter temperatures (1000--2000 K), and it is shown that monolithic, current-matched devices may be constructed that are lattice-matched throughout the stack to an underlying InP substrate. Device efficiency, short-circuit current, fill factor, and open-circuit voltage calculations are presented. The power generation capabilities are expected to be substantial due to the proximity of the devices to the thermal radiators. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

  3. Characteristics of GaAsSb single quantum well lasers emitting near 1.3 {micro}m

    SciTech Connect (OSTI)

    SPAHN,OLGA B.; KLEM,JOHN F.

    2000-02-17T23:59:59.000Z

    The authors report data on GaAsSb single quantum well lasers grown on GaAs substrates. Room temperature pulsed emission at 1.275 {micro}m in a 1,250 {micro}m-long device has been observed. Minimum threshold current densities of 535 A/cm{sup 2} were measured in 2000 {micro}m long lasers. The authors also measured internal losses of 2--5 cm{sup {minus}1}, internal quantum efficiencies of 30-38% and characteristic temperature T{sub 0} of 67--77 C. From these parameters a gain constant G{sub 0} of 1,660 cm{sup {minus}1} and a transparency current density J{sub tr} of 134 A/cm{sup 2} were calculated. The results indicate the potential for fabricating 1.3 {micro}m VCSELs from these materials.

  4. Effect of annealing on the properties of Sb doped ZnO thin films prepared by spray pyrolysis technique

    SciTech Connect (OSTI)

    Kumar, N. Sadananda; Bangera, Kasturi V.; Shivakumar, G. K. [Thin Films Laboratory, Department of Physics, National Institute of Technology Karnataka,Surathkal - 575025, Mangalore (India)

    2014-01-28T23:59:59.000Z

    Sb doped ZnO thin films have been deposited on glass substrate at 450°C using spray pyrolysis technique. The X-ray diffraction studies revealed that the as deposited films are polycrystalline in nature with (100) preferred orientation. Whereas the films annealed at 450° C for 6h show a preferential orientation along (101) direction. Crystallites size varies from 15.7 nm to 34.95 nm with annealing duration. The Scanning electron microscopic analysis shows the plane and smooth surface of the films. The optical properties of annealed films have shown a variation in the band gap between 3.37 eV and 3.19 eV. Transparency of as grown and annealed films decreases from 78 % to 65% respectively in the visible region. The electrical conductivity of the as grown film shows an increase in the electrical conductivity by one order of magnitude with increase in the annealing duration.

  5. TEM Characterization of InAs/GaAs Quantum Dots Capped by a GaSb/GaAs Layer

    SciTech Connect (OSTI)

    Beltran, AM [Universidad de Cadiz, Spain; Ben, Teresa [Universidad de Cadiz, Spain; Sanchez, AM [Universidad de Cadiz, Spain; Sales Lerida, David [ORNL; Chisholm, Matthew F [ORNL; Varela del Arco, Maria [ORNL; Pennycook, Stephen J [ORNL; Galindo, Pedro [Universidad de Cadiz, Spain; Ripalda, JM [Instituto de Microelectronica de Madrid (CNM, CSIC); Molina Rubio, Sergio I [ORNL

    2008-01-01T23:59:59.000Z

    It is well known that there is intense interest in expanding the usable wavelength for electronic devices. This is one of the reasons to study new self-assembled semiconductor nanostructures. Telecommunication applications use InGaAsP/InP emitting at 1.3 and 1.55 m. Research efforts are dedicated to develop GaAs technology in order to achieve emission at the same range as InP, so GaAs could be used for optical fibre communications. Ga(As)Sb on InAs/GaAs quantum dots (QDs) is a promising nanostructure to be used in telecommunications. The introduction of antimony during or after the QDs growth is an effective solution to obtain a red shift in the emission wavelength, even at room temperature.

  6. Measurement and modeling of infrared nonlinear absorption coefficients and laser-induced damage thresholds in Ge and GaSb

    SciTech Connect (OSTI)

    Wagner, T. J.; Bohn, M. J.; Coutu, R. A. Jr. [Air Force Institute of Technology, Wright Patterson Air Force Base, Ohio 45433 (United States); Gonzalez, L. P.; Murray, J. M.; Guha, S. [Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright Patterson Air Force Base, Ohio 45433 (United States); Schepler, K. L. [Air Force Research Laboratory, Sensors Directorate, Wright Patterson Air Force Base, Ohio 45433 (United States)

    2010-10-15T23:59:59.000Z

    Using a simultaneous fitting technique to extract nonlinear absorption coefficients from data at two pulse widths, we measure two-photon and free-carrier absorption coefficients for Ge and GaSb at 2.05 and 2.5 {mu}m for the first time, to our knowledge. Results agreed well with published theory. Single-shot damage thresholds were also measured at 2.5 {mu}m and agreed well with modeled thresholds using experimentally determined parameters including nonlinear absorption coefficients and temperature dependent linear absorption. The damage threshold for a single-layer Al{sub 2}O{sub 3} anti-reflective coating on Ge was 55% or 35% lower than the uncoated threshold for picosecond or nanosecond pulses, respectively.

  7. Fusion Engineering and Design 48 (2000) 371378 Blanket system selection for the ARIES-ST

    E-Print Network [OSTI]

    California at San Diego, University of

    2000-01-01T23:59:59.000Z

    ) is to investigate the attractiveness of a low-aspect-device as the confinement concept for a fusion power plant-ST is investigating the attractive- ness of using an ST configuration as plasma source for a commercial power plant, a 20 cm shield is used. There is no breeding blanket on the in board (IB) of the power plant. Therefore

  8. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE Monetary Policy and Value Judgments

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    GROUPE D'ANALYSE ET DE THÉORIE ÉCONOMIQUE LYON - ST ÉTIENNE WP 1408 Monetary Policy and Value|WorkingPapers #12;GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin des Mouilles 69130 monetary policy. JEL classification: B20, E52, B40 A first version of this paper was presented to the 44th

  9. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1321

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1321 Optimal Monetary Provisions in Plural Form Franchise Systems; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin, France CNRS, GATE Lyon-St Etienne, UMR n 5824, 69130, Ecully, France Universit´e de Saint-Etienne, Jean

  10. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE Ambiguity on audits and cooperation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    GROUPE D'ANALYSE ET DE THÉORIE ÉCONOMIQUE LYON - ST ÉTIENNE WP 1403 Ambiguity on audits Lyon-St Étienne 93, chemin des Mouilles 69130 Ecully ­ France Tel. +33 (0)4 72 86 60 60 Fax +33 (0)4 72@gate.cnrs.fr. b Department of Economics and Business, Universitat Pompeu Fabra and Barcelona Graduate School

  11. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1339

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1339 A Note on Networks of Collaboration in Multi; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin, France. email: pascal.billand@univ-st-etienne.fr bUniversit´e Grenoble 2, UMR 1215 GAEL F3800 Grenoble

  12. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE W P 1213

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , Université Lyon 2, Lyon, F- 69007, France. GATE: 93, Chemin des Mouilles, B.P. 167, 69131 Ecully, France. E; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin-mail: havet@gate.cnrs.fr b Université de Lyon, Lyon, F-69007, France ; CNRS, GATE Lyon St Etienne, Ecully

  13. Water Management, Risk, and Uncertainty: Things We Wish We Knew in the 21st

    E-Print Network [OSTI]

    Shaw, W. Douglass

    Water Management, Risk, and Uncertainty: Things We Wish We Knew in the 21st Century [Forthcoming;1 Introduction A survey is offered of the most difficult and challenging issues to water managers in the 21st Century, focusing on the economics of risks and more so, uncertainty. Risk and uncertainty is addressed

  14. BIOLOGY OF THE BLUE CRAB, CALLINECTES SAPIDUS RATHBUN, IN THE ST. JOHNS RIVER, FLORIDA

    E-Print Network [OSTI]

    BIOLOGY OF THE BLUE CRAB, CALLINECTES SAPIDUS RATHBUN,· IN THE ST. JOHNS RIVER, FLORIDA By MARLIN E ABSTRACT Blue crabs commonly mated from March to July and from October to December In the St. Johns River. Blue crabs spawned in the first 30 km. of river above the mouth, and the eggs hatched in the ocean

  15. Sea ice evolution over the 20th and 21st centuries as simulated by current AOGCMs

    E-Print Network [OSTI]

    Arzel, Olivier

    of the Northern Hemisphere (NH) ice pack over the last few decades (Rothrock et al., 2003). The increas- ingSea ice evolution over the 20th and 21st centuries as simulated by current AOGCMs Olivier Arzel of sea ice over the 20th and 21st centuries. We first use the results from the ``Climate of the 20th

  16. Bell Pettigrew Museum University of St Andrews THE BELL PETTIGREW MUSEUM

    E-Print Network [OSTI]

    Brierley, Andrew

    Bell Pettigrew Museum University of St Andrews THE BELL PETTIGREW MUSEUM OF NATURAL HISTORY to the museum that will go through further changes before final editing. If any of the text is unclear, too- Pacific region. #12;Bell Pettigrew Museum University of St Andrews 2 "Packed full of treasures

  17. EnergyPlusDeST DOE-2.1E Building energy modeling programs comparison

    E-Print Network [OSTI]

    ST #12; 1 IEA BESTest ASHRAE Standard 140[1] [2] 1 EnergyPlus, DeST, DOE-2, ESP, BLAST TRNSYS 1 ASHRAE RP865[1] 2ANSI/ASHRAE Standard 140 [4] 3 IEA SHC BESTest / [5] EnergyPlus [6] [7

  18. Course offer (1/2) Hydrology II (1st Sem. MSc)

    E-Print Network [OSTI]

    Giger, Christine

    1 Course offer (1/2) · Hydrology II (1st Sem. MSc) · advanced engineering hydrology course focused on hydrological monitoring, processunderstanding and new analysis and modelling techniques · Fluvial Systems (1st management and riverine ecosystem sustainability · Hydrology of Glaciers (2nd Sem. MSc) · study of ice

  19. The 33st International Electric Propulsion Conference, The George Washington University, USA October 6 10, 2013

    E-Print Network [OSTI]

    Walker, Mitchell

    The 33st International Electric Propulsion Conference, The George Washington University, USA, 30332, USA Abstract: Accurate measurement of ion charge flux in the plume of spacecraft electric.walker@ae.gatech.edu #12;The 33st International Electric Propulsion Conference, The George Washington University, USA

  20. US-India Education Foundation (USIEF): "Obama-Singh 21st Century Knowledge Initiative"

    E-Print Network [OSTI]

    Nahar, Sultana Nurun

    US-India Education Foundation (USIEF): "Obama-Singh 21st Century Knowledge Initiative" Award competitive grant from the US-India Education Foundation (USIEF), under the Obama-Singh 21st Century Knowledge Initiative, for a pilot project to train STEM faculty in partnership with the Aligarh Muslim University

  1. The effect of development on nitrogen loading on St. John, U.S. Virgin Islands

    E-Print Network [OSTI]

    Navato, Alfred Patrick

    2007-01-01T23:59:59.000Z

    The majority of St. John's land and coast is a National Park and is protected by the federal government. In spite of these restrictions, the population of St. John has risen in the past fifteen years as has the number of ...

  2. Exploiting the 21st amino acid--purifying and labeling proteins by selenolate targeting

    E-Print Network [OSTI]

    Cai, Long

    Exploiting the 21st amino acid--purifying and labeling proteins by selenolate targeting Linda (Sec), the 21st amino acid. The selenium atom endows selenocysteine with unique biochemical properties residue becomes exposed and easily tar- geted by electrophilic compounds12. These properties arise from

  3. 1st International Workshop on High Performance Computing, Networking and Analytics for the Power Grid

    E-Print Network [OSTI]

    1st International Workshop on High Performance Computing, Networking and Analytics for the Power Transient Stability" #12;1st International Workshop on High Performance Computing, Networking and Analytics (University of Vermont). "Developing a Dynamic Model of Cascading Failure for High Performance Computing using

  4. A synchronous model of the PLC programming language ST Fernando Jimenez-Fraustro

    E-Print Network [OSTI]

    Boyer, Edmond

    A synchronous model of the PLC programming language ST Fernando Jimenez-Fraustro IRISA / INRIA F of a synchronous model of the PLC programming lan- guage ST. This work is part of the integration of the IEC 1131 Logic Controllers (PLC) architec- tures. Their design relies on standards like the IEC 1131 norm

  5. INFORMATION TECHNOLOGY AT PRINCETON IN THE 21ST CENTURY: A STRATEGIC DIRECTION

    E-Print Network [OSTI]

    INFORMATION TECHNOLOGY AT PRINCETON IN THE 21ST CENTURY: A STRATEGIC DIRECTION FINDINGS Princeton must consolidate and strengthen its engagement with information technology. This is the principal 2004 If the 20th century was the age of computer technology, the 21st is emerging as the age

  6. Design and Results of the 1st Satisfiability Modulo Theories Competition (SMT-COMP 2005)

    E-Print Network [OSTI]

    Stump, Aaron

    Design and Results of the 1st Satisfiability Modulo Theories Competition (SMT-COMP 2005) Clark in St. Louis Abstract. The Satisfiability Modulo Theories Competition (SMT-COMP) is intended to spark. Evaluation of SMT solvers entered in SMT-COMP took place while CAV 2005 was meeting. Twelve solvers were

  7. Coastal flood damage and adaptation costs under 21st century sea-level rise

    E-Print Network [OSTI]

    Marzeion, Ben

    Coastal flood damage and adaptation costs under 21st century sea-level rise Jochen Hinkela,1st century sea-level rise are assessed on a global scale taking into account a wide range- ment and sea-level rise. Uncertainty in global mean and regional sea level was derived from four

  8. A E Costley ITER Diagnostics, 21st IAEA of 5 slides

    E-Print Network [OSTI]

    shielding, Tritium containment, vacuum integrity, RH compatibility. #12;A E Costley ITER Diagnostics, 21st distinct measurement systems in total. #12;A E Costley ITER Diagnostics, 21st IAEA 9 of 5 slides HANDLING, Germany THE DESIGN AND IMPLEMENTATIONTHE DESIGN AND IMPLEMENTATION OF DIAGNOSTIC SYSTEMS ON ITEROF

  9. First Name Last Name Parish/School System Michelle Adkins St. Charles

    E-Print Network [OSTI]

    Harms, Kyle E.

    Calcasieu Monica Aphonso Vernon Hettie Averite St. Charles Dawn Babineaux Evangeline Jasmine Banks West Vernon Kelly Brant Washington Denise Brashear Calcasieu Jared Breaux West Baton Rouge Joanna Brockhoff St Cole Lafourche Cody Cole Beauregard Jodi Cole Sabine Walter Cole Bossier Connie Conner Beauregard

  10. A Translocated Population of the St. Croix Ground Lizard: Analyzing Its Detection Probability and Investigating its Impacts on the Local Prey Base

    E-Print Network [OSTI]

    Treglia, Michael Louis

    2010-10-12T23:59:59.000Z

    The St. Croix ground lizard, Ameiva polops, is a United States endangered species endemic to St. Croix, U.S. Virgin Islands. It was extirpated from St. Croix Proper by invasive mongooses, and remaining populations are on small, nearby cays...

  11. St. Louis FUSRAP-A Strategy for Success

    SciTech Connect (OSTI)

    Lyerla, M.; Fox, B.; Chinnock, J.; Haase, A.; Wojinski, S.; Bretz, M.; Cotner, S.; Dellorco, L.; Mueller, D.; Roberts, S.; Overmohle, D.

    2002-02-27T23:59:59.000Z

    In October 1997, Congress transferred the Formerly Utilized Sites Remedial Action Program (FUSRAP) from the Department of Energy (DOE) to the United States Army Corps of Engineers (USACE). FUSRAP addresses contamination generated by activities of the Manhattan Engineering District and the Atomic Energy Commission during the 1940's and 50's in support of the nation's nuclear weapons development program. The USACE Operation Order for FUSRAP gave responsibility for remediation of five sites in Missouri and Illinois to the USACESt. Louis District. The principal site is the St. Louis Airport Site (SLAPS), which involves the removal, transportation, disposal, and restoration of approximately 28 acres and 245,000 bank cubic yards (bcy) of contaminated soils. This paper will focus on the progress and achievements in removal action efficiencies of the SLAPS team. This team consists primarily of the USACE and Stone & Webster, Incorporated.

  12. Results of mobile gamma scanning activities in St. Louis, Missouri

    SciTech Connect (OSTI)

    Rodriguez, R E; Witt, D A; Cottrell, W D; Carrier, R F

    1991-06-01T23:59:59.000Z

    From 1942 through approximately 1966, the Mallinckrodt Chemical Works operated four plants in St. Louis, Missouri, for the Manhattan Engineer District and the Atomic Energy Commission. A variety of production processes using uranium- and radium-bearing ore materials were performed at the plants. It is the policy of the DOE to verify that radiological conditions at such sites or facilities comply with current DOE guidelines. Guidelines for release and use of such sites have become more stringent as research has provided more information since previous cleanups. The Formerly Utilized Sites Remedial Action Program (FUSRAP) was established as part of that effort to confirm the closeout status of facilities under contract to agencies preceding DOE during early nuclear energy development. Under the FUSRAP program, the Mallinckrodt properties have been previously investigated to determine the extent of on-site radiological contamination. At the request of DOE, Oak Ridge National Laboratory (ORNL) conducted a survey in May 1990, of public roadways and suspected haul routes between the Mallinckrodt plant and storage sites in St. Louis to ensure that no residual radioactive materials were conveyed off-site. A mobile gamma scanning van with an on-board computer system was used to identify possible anomalies. Suspect areas are those displaying measurements deviating from gamma exposure rates identified as typical for radiologically unenhanced areas in the vicinity of the areas of interest. The instrumentation highlighted three anomaly locations each of which measured less than 1m{sup 2} in size. None of the slightly elevated radiation levels originated from material associated with former AEC-related processing operations in the area. The anomalies resulted from elevated concentrations of radionuclides present in phosphate fertilizers, increased thorium in road-base gravel, and emanations from the radioactive storage site near the Latty Avenue airport. 9 refs., 3 figs.

  13. Experimental Verification of the Van Vleck Nature of Long-Range Ferromagnetic Order in the Vanadium-Doped Three-Dimensional Topological Insulator Sb[subscript 2]Te[subscript 3

    E-Print Network [OSTI]

    Li, Mingda

    We demonstrate by high resolution low temperature electron energy loss spectroscopy (EELS) measurements that the long range ferromagnetic (FM) order in the vanadium- (V-)doped topological insulator Sb[subscript 2]Te[subscript ...

  14. Social Media, Social Kids: Sociocultural Implications of 21st Century Media for Development in the Preteen Period.

    E-Print Network [OSTI]

    Tehranian, Yalda

    2013-01-01T23:59:59.000Z

    Foundation Series on Digital Media and Learning (1st ed. ).connected: The new digital media habits of young children.Foundation Series on Digital Media and Learning (1st ed. ).

  15. Validation of Innovative Exploration Technologies for Newberry Volcano: Seismic data - raw taken by Apex Hipoint for 1st test 2012

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

    Jaffe, Todd

    Validation of Innovative Exploration Technologies for Newberry Volcano: Seismic data - raw taken by Apex Hipoint for 1st test 2012

  16. Validation of Innovative Exploration Technologies for Newberry Volcano: Seismic data - raw taken by Apex Hipoint for 1st test 2012

    SciTech Connect (OSTI)

    Jaffe, Todd

    2012-01-01T23:59:59.000Z

    Validation of Innovative Exploration Technologies for Newberry Volcano: Seismic data - raw taken by Apex Hipoint for 1st test 2012

  17. Feasibility Study of Economics and Performance of Solar Photovoltaics at the Former St. Marks Refinery in St. Marks, Florida

    SciTech Connect (OSTI)

    Lisell, L.; Mosey, G.

    2010-09-01T23:59:59.000Z

    This report presents the results of an assessment of the technical and economic feasibility of deploying a photovoltaics (PV) system on a brownfield site in St. Marks, Florida. The site was assessed for possible PV installations. The cost, performance, and site impacts of different PV options were estimated. The economics of the potential systems were analyzed using an electric rate of $0.08/kWh and incentives offered in the State of Florida and from the two accessible utilities, Progress Energy and the City of Tallahassee. According to the site production calculations, the most cost-effective system in terms of return on investment is the fixed-tilt thin film technology. The report recommends financing options that could assist in the implementation of such a system.

  18. Proceedings of 2006 NSF Design, Service, and Manufacturing Grantees and Research Conference, St. Louis, Missouri Grant #DMI-0423791 Collaborative Research: Contacting and Solidification in Casting-by-Design

    E-Print Network [OSTI]

    Thomas, Brian G.

    Proceedings of 2006 NSF Design, Service, and Manufacturing Grantees and Research Conference, St, Service, and Manufacturing Grantees and Research Conference, St. Louis, Missouri Grant #DMI-0423791 Figure

  19. Cultural contributions to the island of St. John, United States Virgin Islands: underwater historical archaeology at Cruz Bay

    E-Print Network [OSTI]

    Marquez, Carmen M

    1995-01-01T23:59:59.000Z

    The United States Virgin Islands, St. Thomas, St. Croix and St. John, in the Lesser Antilles, were discovered by Christopher Columbus in November, 1493, on his second voyage. The islands were not revisited by the Spanish for over 57 years. During...

  20. High performance photodiodes based on InAs/InAsSb type-II superlattices for very long wavelength infrared detection

    SciTech Connect (OSTI)

    Hoang, A. M.; Chen, G.; Chevallier, R.; Haddadi, A.; Razeghi, M., E-mail: razeghi@eecs.northwestern.edu [Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208 (United States)

    2014-06-23T23:59:59.000Z

    Very long wavelength infrared photodetectors based on InAs/InAsSb type-II superlattices are demonstrated on GaSb substrate. A heterostructure photodiode was grown with 50% cut-off wavelength of 14.6??m. At 77?K, the photodiode exhibited a peak responsivity of 4.8?A/W, corresponding to a quantum efficiency of 46% at ?300?mV bias voltage from front side illumination without antireflective coating. With the dark current density of 0.7?A/cm{sup 2}, it provided a specific detectivity of 1.4?×?10{sup 10} Jones. The device performance was investigated as a function of operating temperature, revealing a very stable optical response and a background limited performance below 50?K.

  1. Thermoelectric power of Bi and Bi{sub 1{minus}x}Sb{sub x} alloy thin films and superlattices grown by MBE

    SciTech Connect (OSTI)

    Cho, S.; DiVenere, A.; Wong, G.K.; Ketterson, J.B.; Meyer, J.R.; Hoffman, C.A.

    1997-07-01T23:59:59.000Z

    The authors have measured the thermoelectric power (TEP) of MBE-grown epitaxial Bi and Bi{sub 1{minus}x} alloy thin films and superlattices as a function of temperature in the range 20--300 K. They have observed that the TEP of a Bi thin film of 1 {micro}m thickness is in good agreement with the bulk single crystal value and that the TEPs for superlattices with 400 {angstrom} and 800 {angstrom} Bi well thicknesses are enhanced over the bulk values. For x = 0.072 and 0.088 in Bi{sub 1{minus}x}Sb{sub x} thin films showing semiconducting behavior, TEP enhancement was observed by a factor of two. However as Bi or Bi{sub 1{minus}x}Sb{sub x} well thickness decreases in superlattice geometry, the TEP decreases, which may be due to unintentional p-type doping.

  2. Reverse Monte Carlo simulation of Se{sub 80}Te{sub 20} and Se{sub 80}Te{sub 15}Sb{sub 5} glasses

    SciTech Connect (OSTI)

    Abdel-Baset, A. M.; Rashad, M. [Physics Department, Faculty of Science , Assiut University, Assiut, P.O. Box 71516 (Egypt); Moharram, A. H. [Faculty of Science, King Abdul Aziz Univ., Rabigh Branch, P.O. Box 433 (Saudi Arabia)

    2013-12-16T23:59:59.000Z

    Two-dimensional Monte Carlo of the total pair distribution functions g(r) is determined for Se{sub 80}Te{sub 20} and Se{sub 80}Te{sub 15}Sb{sub 5} alloys, and then it used to assemble the three-dimensional atomic configurations using the reverse Monte Carlo simulation. The partial pair distribution functions g{sub ij}(r) indicate that the basic structure unit in the Se{sub 80}Te{sub 15}Sb{sub 5} glass is di-antimony tri-selenide units connected together through Se-Se and Se-Te chain. The structure of Se{sub 80}Te{sub 20} alloys is a chain of Se-Te and Se-Se in addition to some rings of Se atoms.

  3. Inductively Coupled Plasma Etching in ICl- and IBr-Based Chemistries: Part II. InP, InSb, InGaP and InGaAs

    SciTech Connect (OSTI)

    Abernathy, C.R.; Cho, H.; Hahn, Y.B.; Hays, D.C.; Hobson, W.S.; Jung, K.B.; Lambers, E.S.; Pearton, S.J.; Shul, R.J.

    1998-11-23T23:59:59.000Z

    A parametric study of Inductively Coupled Plasma etching of InP, InSb, InGaP and InGaAs has been carried out in IC1/Ar and IBr/Ar chemistries. Etch rates in excess of 3.1 prrdmin for InP, 3.6 prnh-nin for InSb, 2.3 pm/min for InGaP and 2.2 ~rrdmin for InGaAs were obtained in IBr/Ar plasmas. The ICP etching of In-based materials showed a general tendency: the etch rates increased substantially with increasing the ICP source power and rf chuck power in both chemistries, while they decreased with increasing chamber pressure. The IBr/Ar chemistry typically showed higher etch rates than IC1/Ar, but the etched surface mophologies were fairly poor for both chemistries.

  4. Capping layer growth rate and the optical and structural properties of GaAsSbN-capped InAs/GaAs quantum dots

    SciTech Connect (OSTI)

    Ulloa, J. M., E-mail: jmulloa@isom.upm.es; Utrilla, A. D.; Guzman, A.; Hierro, A. [Institute for Systems based on Optoelectronics and Microtechnology (ISOM) and Dpto. Ingeniería Electrónica, Universidad Politecnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid (Spain); Reyes, D. F.; Ben, T.; González, D. [Departamento de Ciencia de los Materiales e IM y QI, Universidad de Cádiz, 11510 Puerto Real (Cádiz) (Spain)

    2014-10-07T23:59:59.000Z

    Changing the growth rate during the heteroepitaxial capping of InAs/GaAs quantum dots (QDs) with a 5?nm-thick GaAsSbN capping layer (CL) strongly modifies the QD structural and optical properties. A size and shape transition from taller pyramids to flatter lens-shaped QDs is observed when the CL growth rate is decreased from 1.5 to 0.5 ML/s. This indicates that the QD dissolution processes taking place during capping can be controlled to some extent by the GaAsSbN CL growth rate, with high growth rates allowing a complete preservation of the QDs. However, the dissolution processes are shown to have a leveling effect on the QD height, giving rise to a narrower size distribution for lower growth rates. Contrary to what could be expected, these effects are opposite to the strong blue-shift and improvement of the photoluminescence (PL) observed for higher growth rates. Nevertheless, the PL results can be understood in terms of the strong impact of the growth rate on the Sb and N incorporation into the CL, which results in lower Sb and N contents at higher growth rates. Besides the QD-CL band offsets and QD strain, the different CL composition alters the band alignment of the system, which can be transformed to type-II at low growth rates. These results show the key role of the alloyed CL growth parameters on the resulting QD properties and demonstrate an intricate correlation between the PL spectra and the sample morphology in complex QD-CL structures.

  5. Dynamical scaling properties of nanoporous undoped and Sb-doped SnO{sub 2} supported thin films during tri- and bidimensional structure coarsening

    SciTech Connect (OSTI)

    Santilli, C. V.; Rizzato, A. P.; Pulcinelli, S. H.; Craievich, A. F. [Instituto de Quimica/UNESP, P.O. Box 355, Araraquara, Sao Paulo 14800-900 (Brazil); Instituto de Fisica/USP, P.O. Box 66318, Sao Paulo, Sao Paulo 05315-970, (Brazil)

    2007-05-15T23:59:59.000Z

    The coarsening of the nanoporous structure developed in undoped and 3% Sb-doped SnO{sub 2} sol-gel dip-coated films deposited on a mica substrate was studied by time-resolved small-angle x-ray scattering (SAXS) during in situ isothermal treatments at 450 and 650 deg. C. The time dependence of the structure function derived from the experimental SAXS data is in reasonable agreement with the predictions of the statistical theory of dynamical scaling, thus suggesting that the coarsening process in the studied nanoporous structures exhibits dynamical self-similar properties. The kinetic exponents of the power time dependence of the characteristic scaling length of undoped SnO{sub 2} and 3% Sb-doped SnO{sub 2} films are similar ({alpha}{approx_equal}0.09), this value being invariant with respect to the firing temperature. In the case of undoped SnO{sub 2} films, another kinetic exponent, {alpha}{sup '}, corresponding to the maximum of the structure function was determined to be approximately equal to three times the value of the exponent {alpha}, as expected for the random tridimensional coarsening process in the dynamical scaling regime. Instead, for 3% Sb-doped SnO{sub 2} films fired at 650 deg. C, we have determined that {alpha}{sup '}{approx_equal}2{alpha}, thus suggesting a bidimensional coarsening of the porous structure. The analyses of the dynamical scaling functions and their asymptotic behavior at high q (q being the modulus of the scattering vector) provided additional evidence for the two-dimensional features of the pore structure of 3% Sb-doped SnO{sub 2} films. The presented experimental results support the hypotheses of the validity of the dynamic scaling concept to describe the coarsening process in anisotropic nanoporous systems.

  6. Prediction of Ordering and Spontaneous Rotation of Epitaxial Habits in Substrate-Coherent InGaN and GaAsSb

    SciTech Connect (OSTI)

    Liu, J. Z.; Trimarchi, G.; Zunger, A.

    2009-01-01T23:59:59.000Z

    Coherently strained In{sub 0.5}Ga{sub 0.5}N on GaN and CaO substrates are theoretically predicted to show stable ordering in the chalcopyrite structure, as is Ga{sub 2}AsSb on GaAs and InP substrates. Depending on the substrate and the film concentration, we predict a spontaneous rotation of the stablest chalcopyrite film axis from perpendicular to parallel to the (001) substrate.

  7. SLUDGE BATCH 7 (SB7) WASHING DEMONSTRATION TO DETERMINE SULFATE/OXALATE REMOVAL EFFICIENCY AND SETTLING BEHAVIOR

    SciTech Connect (OSTI)

    Reboul, S.; Click, D.; Lambert, D.

    2010-12-10T23:59:59.000Z

    To support Sludge Batch 7 (SB7) washing, a demonstration of the proposed Tank Farm washing operation was performed utilizing a real-waste test slurry generated from Tank 4, 7, and 12 samples. The purpose of the demonstration was twofold: (1) to determine the settling time requirements and washing strategy needed to bring the SB7 slurry to the desired endpoint; and (2) to determine the impact of washing on the chemical and physical characteristics of the sludge, particularly those of sulfur content, oxalate content, and rheology. Seven wash cycles were conducted over a four month period to reduce the supernatant sodium concentration to approximately one molar. The long washing duration was due to the slow settling of the sludge and the limited compaction. Approximately 90% of the sulfur was removed through washing, and the vast majority of the sulfur was determined to be soluble from the start. In contrast, only about half of the oxalate was removed through washing, as most of the oxalate was initially insoluble and did not partition to the liquid phase until the latter washes. The final sulfur concentration was 0.45 wt% of the total solids, and the final oxalate concentration was 9,900 mg/kg slurry. More oxalate could have been removed through additional washing, although the washing would have reduced the supernatant sodium concentration.The yield stress of the final washed sludge (35 Pa) was an order of magnitude higher than that of the unwashed sludge ({approx}4 Pa) and was deemed potentially problematic. The high yield stress was related to the significant increase in insoluble solids that occurred ({approx}8 wt% to {approx}18 wt%) as soluble solids and water were removed from the slurry. Reduction of the insoluble solids concentration to {approx}14 wt% was needed to reduce the yield stress to an acceptable level. However, depending on the manner that the insoluble solids adjustment was performed, the final sodium concentration and extent of oxalate removal would be prone to change. As such, the strategy for completing the final wash cycle is integral to maintaining the proper balance of chemical and physical requirements.

  8. Madison St. Harrison St.

    E-Print Network [OSTI]

    Raina, Ramesh

    along the Connective Corridor 8. Noon - Green Building Tour - Meet at the SyracuseCOE 9. Noon - Green Building Tour - Meet at Synapse 10.Noon - Green Building Tour - Meet at Hotel Skyler 11.Noon - Green Building Tour - Meet at CNY Community Foundation/CNY Philanthropy Center 12.Noon - Green Building Tour

  9. Uranium characterization at the St. Louis Airport Site

    SciTech Connect (OSTI)

    Schilk, A.J.; Hubbard, C.W.; Bowyer, T.W. [Pacific Northwest Lab., Richland, WA (United States); Reiman, R.T. [Technical Measurement Co., Boulder, CO (United States)

    1995-05-01T23:59:59.000Z

    In support of the Department of Energy/Office of Technology Development`s Expedited Site Characterization (ESC) project (coordinated by Ames Laboratory), the Pacific Northwest Laboratory demonstrated two complementary technologies at the St. Louis Airport (SLAP) site that have been designed and optimized for the rapid, in situ quantification of radionuclide contamination in surface soils. The sensors are optimized for the detection of high-energy beta particles or gamma rays emitted from the decay of specific radionuclides of interest. These technologies were demonstrated by measuring the beta and gamma fluxes at several locations within the SLAP site. Measurements were converted to average contamination levels, using detector calibrations performed with spiked samples (beta) or sealed sources (gamma). Additionally, subsurface activity levels were derived from discrete soil samples (provided by the ESC field crew) via gamma-ray spectrometry in a controlled laboratory setting. Since the beta and gamma sensor technologies are intrinsically sensitive to different types of radiation and activity distributions (i.e., surface and shallow subsurface, respectively), the data obtained from the two detectors provide complementary information about the distribution of the contamination. The results reported here suggest that a number of locations within the SLAP site have elevated levels of {sup 211}U, and the differences between the beta and gamma activities indicate that the contamination is largely located near the surface of the soil.

  10. Persisting cold extremes under 21st-century warming scenarios

    SciTech Connect (OSTI)

    Kodra, Evan A [ORNL; Steinhaeuser, Karsten J K [ORNL; Ganguly, Auroop R [ORNL

    2011-01-01T23:59:59.000Z

    Analyses of climate model simulations and observations reveal that extreme cold events are likely to persist across each land-continent even under 21st-century warming scenarios. The grid-based intensity, duration and frequency of cold extreme events are calculated annually through three indices: the coldest annual consecutive three-day average of daily maximum temperature, the annual maximum of consecutive frost days, and the total number of frost days. Nine global climate models forced with a moderate greenhouse-gas emissions scenario compares the indices over 2091 2100 versus 1991 2000. The credibility of model-simulated cold extremes is evaluated through both bias scores relative to reanalysis data in the past and multi-model agreement in the future. The number of times the value of each annual index in 2091 2100 exceeds the decadal average of the corresponding index in 1991 2000 is counted. The results indicate that intensity and duration of grid-based cold extremes, when viewed as a global total, will often be as severe as current typical conditions in many regions, but the corresponding frequency does not show this persistence. While the models agree on the projected persistence of cold extremes in terms of global counts, regionally, inter-model variability and disparity in model performance tends to dominate. Our findings suggest that, despite a general warming trend, regional preparedness for extreme cold events cannot be compromised even towards the end of the century.

  11. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1323

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1323 Social Networks and Peer Effects at Work Julie; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin, Guy Lacroixc, Marie Claire Villevald a Department of economics, Université Laval, CIRPÉE b Department

  12. The Forgotten Children: African American Children and Child Welfare Reform in St. Louis, 1890-1930

    E-Print Network [OSTI]

    Thirlkel, Thomas E.

    2010-05-07T23:59:59.000Z

    Abstract Forgotten Children examines the influence of racial ideology on the trajectory of child welfare reform in late nineteenth century and early twentieth century St. Louis. The modern American child welfare system emerged in this time period...

  13. Microsoft Word - FEIS-0285-SA-452-Ross-StJohns-PPA2108_WEB.doc

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

    8, 2011 REPLY TO ATTN OF: KEP-4 SUBJECT: Supplement Analysis for the Transmission System Vegetation Management Program FEIS (DOEEIS- 0285SA-452 Ross-St. Johns No. 1) PP&A Project...

  14. MONITORING OF CRACKS ON THE BELL TOWER OF ST. ANASTASIA CATHEDRAL IN ZADAR CROATIA

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    MONITORING OF CRACKS ON THE BELL TOWER OF ST. ANASTASIA CATHEDRAL IN ZADAR CROATIA Davor Uglesi 1 , Uros Bohinc 2 1 D & Z doo, Jerolima Vidulia 7, 23000 Zadar, Croatia 2 ZAG, Dimiceva 12, 1000 Ljubljana

  15. Probabilistic projections of 21st century climate change over Northern Eurasia

    E-Print Network [OSTI]

    Monier, Erwan

    We present probabilistic projections of 21st century climate change over Northern Eurasia using the Massachusetts Institute of Technology (MIT) Integrated Global System Model (IGSM), an integrated assessment model that ...

  16. Probabilistic Projections of 21st Century Climate Change over Northern Eurasia

    E-Print Network [OSTI]

    Monier, Erwan

    2013-07-18T23:59:59.000Z

    We present probabilistic projections of 21st century climate change over Northern Eurasia using the Massachusetts Institute of Technology (MIT) Integrated Global System Model (IGSM), an integrated assessment model that ...

  17. Development and implementation of a coral health assessment tool for St. John, USVI

    E-Print Network [OSTI]

    Detlefsen, William Robert

    2007-01-01T23:59:59.000Z

    Coral health in St. John, US Virgin Islands, has shown tremendous declines in recent years, with more than 50% declines in live coral cover. As one component of a group project to assess the possible impacts of anthropogenic ...

  18. EECBG Success Story: St. Paul Parking Ramp Serves as a Model...

    Office of Environmental Management (EM)

    Paul Parking Ramp Serves as a Model for Sustainability EECBG Success Story: St. Paul Parking Ramp Serves as a Model for Sustainability April 17, 2014 - 2:10pm Addthis Upgrades such...

  19. Meeting report for the 1st skin microbiota workshop, Boulder, CO October 15-16 2012

    E-Print Network [OSTI]

    Gilbert, Jack A

    This report details the outcome of the 1st Skin Microbiota Workshop, Boulder, CO, held on October 15th-16th 2012. The workshop was arranged to bring Department of Defense personnel together with experts in microbial ecology, ...

  20. Clean, Efficient, and Reliable Power for the 21st Century: Fact...

    Energy Savers [EERE]

    Fact Sheet This fact sheet provides an overview of the U.S. Department of Energy's Fuel Cell Technologies Office. Clean, Efficient, and Reliable Power for the 21st Century...

  1. Public-Private Leadership Forum (PPLF) (Fact Sheet), 21st Century...

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

    Public-Private Leadership Forum (PPLF) The Public-Private Leadership Forum (PPLF) is a foundational component of the 21st Century Power Partnership. The PPLF * Serves as a platform...

  2. Grandparenting in the 21st Problems such as substance abuse, catastrophic illness, teen pregnancy, incarceration, unemployment,

    E-Print Network [OSTI]

    Grandparenting in the 21st Century Problems such as substance abuse, catastrophic illness, teen. The following information from the Texas A&M AgriLife Extension Service may be helpful Take Care of Yourself

  3. NOAA Technical Memorandum ERL GLERL-24 UPPER ST. LAWRENCE RIVER HYDRAULIC TRANSIENT MODEL

    E-Print Network [OSTI]

    of the St. Lawrence Seaway in 1959. Operation of the power dam is governed by the water level in Lake interests of national and international power, navigation, recreation, industrial, and domestic users

  4. World Renewable Energy Congress 2011 Sweden Sustainable Transport (ST) 8-11 May 2011, Linkping, Sweden

    E-Print Network [OSTI]

    World Renewable Energy Congress 2011 ­ Sweden Sustainable Transport (ST) 8-11 May 2011, Linköping, Sweden Effects of Biodiesel Fuel Use on Vehicle Emissions Larry G. Anderson1,* 1 University of Colorado

  5. St. Lucie County- Solar and Energy Loan Fund (SELF)(Florida)

    Broader source: Energy.gov [DOE]

    St. Lucie County has partnered with local financial institutions and community leaders to establish the non-profit Solar and Energy Loan Fund (SELF), which will administer a low-interest loan...

  6. Great Lakes-St. Lawrence River Basin Water Resources Compact (multi-state)

    Broader source: Energy.gov [DOE]

    This Act describes the management of the Great Lakes - St. Lawrence River basin, and regulates water withdrawals, diversions, and consumptive uses from the basin. The Act establishes a Council,...

  7. Summer School in Nepal An International Summer Course (July 21st -

    E-Print Network [OSTI]

    Rimon, Elon

    Summer School in Nepal An International Summer Course (July 21st - August 15th) - Engineering the course in Nepal." In 2008, Talesnick established, at Technion, Israel's first chapter of Engineers

  8. Physics Basis for the ARIES-ST Power Plant S.C. Jardin,

    E-Print Network [OSTI]

    Physics Basis for the ARIES-ST Power Plant T.K. Mau, a S.C. Jardin, b C.E. Kessel, b J.E. Menard, b -- ARIES-ST, a fusion power plant design based on the spherical tokamak concept, has many attractive] as a potential power plant and volumetric neutron source. At the beginning of 1999, the ARIES Group has completed

  9. Reproductive Endocrinology of Nesting Leatherback Sea Turtles in St. Croix, U.S. Virgin Islands

    E-Print Network [OSTI]

    Garner, Jeanne

    2012-07-16T23:59:59.000Z

    REPRODUCTIVE ENDOCRINOLOGY OF NESTING LEATHERBACK SEA TURTLES IN ST. CROIX, U.S. VIRGIN ISLANDS A Dissertation by JEANNE ALEXANDER GARNER Submitted to the Office of Graduate Studies of Texas A&M University in partial....S. Virgin Islands Copyright 2012 Jeanne Alexander Garner REPRODUCTIVE ENDOCRINOLOGY OF NESTING LEATHERBACK SEA TURTLES IN ST. CROIX, U.S. VIRGIN ISLANDS A Dissertation by JEANNE ALEXANDER GARNER Submitted to the Office of Graduate...

  10. THE IMPACT OF A TANK 40H DECANT ON THE PROJECTED OPERATING WINDOWS FOR SB4 AND GLASS SELECTION STRATEGY IN SUPPORT OF THE VARIABILITY STUDY

    SciTech Connect (OSTI)

    Raszewski, F; Tommy Edwards, T; David Peeler, D

    2008-02-07T23:59:59.000Z

    The Liquid Waste Organization (LWO) has requested that the Savannah River National Laboratory (SRNL) to assess the impact of a 100K gallon decant volume from Tank 40H on the existing sludge-only Sludge Batch 4 (SB4)-Frit 510 flowsheet and the coupled operations flowsheet (SB4 with the Actinide Removal Process (ARP)). Another potential SB4 flowsheet modification of interest includes the addition of 3 wt% sodium (on a calcined oxide basis) to a decanted sludge-only or coupled operations flowsheet. These potential SB4 flowsheet modifications could result in significant compositional shifts to the SB4 system. This paper study provides an assessment of the impact of these compositional changes to the projected glass operating windows and to the variability study for the Frit 510-SB4 system. The influence of the compositional changes on melt rate was not assessed in this study nor was it requested. Nominal Stage paper study assessments were completed using the projected compositions for the various flowsheet options coupled with Frit 510 (i.e., variation was not applied to the sludge and frit compositions). In order to gain insight into the impacts of sludge variation and/or frit variation (due to the procurement specifications) on the projected operating windows, three versions of the Variation Stage assessment were performed: (1) the traditional Variation Stage assessment in which the nominal Frit 510 composition was coupled with the extreme vertices (EVs) of each sludge, (2) an assessment of the impact of possible frit variation (within the accepted frit specification tolerances) on each nominal SB4 option, and (3) an assessment of the impact of possible variation in the Frit 510 composition due to the vendor's acceptance specifications coupled with the EVs of each sludge case. The results of the Nominal Stage assessment indicate very little difference among the various flowsheet options. All of the flowsheets provide DWPF with the possibility of targeting waste loadings (WLs) from the low 30s to the low 40s with Frit 510. In general, the Tank 40H decant has a slight negative impact on the operating window, but DWPF still has the ability to target current WLs (34%) and higher WLs if needed. While the decant does not affect practical WL targets in DWPF, melt rate could be reduced due to the lower Na{sub 2}O content. If true, the addition of 3 wt% Na{sub 2}O to the glass system may regain melt rate, assuming that the source of alkali is independent of the impact on melt rate. Coupled operations with Frit 510 via the addition of ARP to the decanted SB4 flowsheet also appears to be viable based on the projected operating windows. The addition of both ARP and 3 wt% Na{sub 2}O to a decanted Tank 40H sludge may be problematic using Frit 510. Although the Nominal Stage assessments provide reasonable operating windows for the SB4 flowsheets being considered with Frit 510, introduction of potential sludge and/or frit compositional variation does have a negative impact. The magnitude of the impact on the projected operating windows is dependent on the specific flowsheet options as well as the applied variation. The results of the traditional Variation Stage assessments indicate that the three proposed Tank 40H decanted flowsheet options (Case No.2--100K gallon decant, Case No.3--100K gallon decant and 3 wt% Na{sub 2}O addition and Case No.4--100K gallon decant and ARP) demonstrate a relatively high degree of robustness to possible sludge variation over WLs of interest with Frit 510. However, the case where the addition of both ARP and 3 wt% Na{sub 2}O is considered was problematic during the traditional Variation Stage assessment. The impact of coupling the frit specifications with the nominal SB4 flowsheet options on the projected operating windows is highly dependent on whether the upper WLs are low viscosity or liquidus temperature limited in the Nominal Stage assessments. Systems that are liquidus temperature limited exhibit a high degree of robustness to the applied frit and sludge variation, while those that are low viscosity li

  11. Crystal structure of Mn{sub 2}Ln{sub 3}Sb{sub 3}O{sub 14} (Ln=La, Pr and Nd): A new ordered rhombohedral pyrochlore

    SciTech Connect (OSTI)

    Fu, W.T., E-mail: w.fu@chem.leidenuniv.nl; IJdo, D.J.W.

    2014-05-01T23:59:59.000Z

    Manganese rare earth antimonates with the formula Mn{sub 2}Ln{sub 3}Sb{sub 3}O{sub 14} (Ln=La–Yb and Y) have been prepared and their structures were determined by the Rietveld method using X-ray diffraction data. The compounds with Ln=La, Pr and Nd crystallize in a rhombohedral supercell of the cubic fluorite with the space group R3{sup ¯}m and with the lattice parameters a{sub h}??2a{sub c} and c{sub h}?2?3a{sub c}, where a{sub c} denotes the lattice constant of the cubic fluorite. The structure is pyrochlore-like but differs from the common cubic pyrochlore A{sub 2}B{sub 2}O{sub 7} in that it consists of fully ordered Mn:Ln in the A sites and Mn:Sb in the B sites with the ratio 1:3. The most interesting feature of Mn{sub 2}Ln{sub 3}Sb{sub 3}O{sub 14} is that the divalent Mn ions have different coordination numbers with oxygen and the Mn(II)O{sub 6} (octahedron) and Mn(II)O{sub 8} (hexagonal bipyramid) alternate along the parent cubic fluorite axes. For medium sized lanthanides, i.e. from Ln=Sm, the rhombohedral phase coexists with the cubic phase and Mn{sub 2}Y{sub 3}Sb{sub 3}O{sub 14} is cubic a pyrochlore. - Graphical abstract: Crystal structure of rhombohedral pyrochlore Mn{sub 2}Ln{sub 3}Sb{sub 3}O{sub 14} (Ln=La, Pr, and Nd) showing the staking of Ln{sub 3}Mn and MnSb{sub 3} layers (a). (b) and (c) show the connections between Mn1O{sub 6} and LnO{sub 8} and between Mn2O{sub 8} and SbO{sub 6} polyhedra, respectively. - Highlights: • Pyrochlores of the formula Mn{sub 2}Ln{sub 3}Sb{sub 3}O{sub 14} (Ln=La–Yb and Y) were synthesized for the first time. • Mn{sub 2}Ln{sub 3}Sb{sub 3}O{sub 14} with Ln=La, Pr, Nd are rhombohedral consisting of fully 1:3 ordering of metal ions. • With medium-sized Ln, rhombohedral phase co-exists with cubic phase. • Two divalent Mn ions have coordination numbers of 6 and 8, respectively.

  12. Structure and properties of Na{sub x}M{sub 2}SbO{sub 6}·yH{sub 2}O, M=Co(III), Ni(III) honeycomb oxyhydrates

    SciTech Connect (OSTI)

    Roudebush, J.H., E-mail: jhr@princeton.edu; Cava, R.J.

    2013-08-15T23:59:59.000Z

    The oxyhydrates Na{sub 0.85}Co{sub 2}SbO{sub 6}·1.7H{sub 2}O and Na{sub 0.95}Ni{sub 2}SbO{sub 6}·1.5H{sub 2}O were prepared by Br{sub 2} oxidation of Na{sub 3}Co{sub 2}SbO{sub 6} and Na{sub 3}Ni{sub 2}SbO{sub 6} and exposure to ambient air. Their composition and structure are characterized by thermogravimetric analysis, elemental analysis and powder X-ray diffraction. Both form monolayer hydrates with metal cations (Co or Ni) near the 3+ oxidation state. In the parent materials, MO{sub 6} octahedra surround SbO{sub 6} units, forming a honeycomb geometry; Rietveld refinement of the hydrate phases indicate that this motif is retained. Magnetic susceptibility plots display paramagnetic behavior and Curie–Weiss fits support the 3+ oxidation state (low spin d{sup 6}s=0 for Co and low spin d{sup 7}s=1/2 for Ni). Close inspection of the Ni hydrate’s susceptibility reveals a feature at 6.2 K and a non-linear magnetization at 2 K with no saturation up to 9 T. Heat capacity measurements show a large amount of excess entropy in the Ni hydrate in the 2–20 K temperature range, while the heat capacity of the Co hydrate can be described by a simple lattice contribution. The Ni hydrate sample is easily dehydrated by heating above 100 °C and forms a new Na-deficient phase, Na{sub 0.95}Ni{sub 2}SbO{sub 6}, which is stable at room temperature. Magnetic susceptibility of this phase is consistent with the Ni atom remaining in the 3+ oxidation state after dehydration. - Graphical abstract: Powder diffraction patterns of Na{sub 3}Ni{sub 2}SbO{sub 6}, Na{sub 0.95}Ni{sub 2}SbO{sub 6}·1.5H{sub 2}O and Na{sub 0.95}Ni{sub 2}SbO{sub 6}. Each pattern has been normalized in intensity. Cartoons depict the change in layer separation with hydration and give the approximate distances between layers and Ni atoms. Highlights: • New oxyhydrate phases with honeycomb lattices are formed. • Curie–Weiss fits indicate Ni{sup 3+} (s=1/2). • Heat capacity shows a large release of entropy for Ni phase, likely due to a complex magneto-structural phase transition.

  13. MECHANISMS OF PHASE FORMATION IN THE VITRIFICATION OF HIGH-FERROUS SAVANNAH RIVER SITE SB2 HLW SLUDGE SURROGATE - 9300

    SciTech Connect (OSTI)

    Marra, J

    2008-08-27T23:59:59.000Z

    Phase formation mechanisms associated with the vitrification of high-ferrous Savannah River Site (SRS) Sludge Batch 2 (SB2) high level waste surrogate were studied by infrared spectroscopy (IRS) and X-ray diffraction (XRD). Two mixtures at 50 wt% waste loading with commercially available Frit 320 (Li{sub 2}O - 8 wt %, B{sub 2}O{sub 3} - 8 wt %, Na{sub 2}O - 12 wt %, SiO{sub 2} - 72 wt %) and batch chemicals (LiOH {center_dot} H{sub 2}O, H{sub 3}BO{sub 3}, NaNO{sub 3}, SiO{sub 2}) to represent the frit formulation were prepared as slurries with a water content of {approx}50 wt%. The mixtures were air-dried at a temperature of 115 C and heat-treated at 500, 700, 900, 1000, 1100, 1200, and 1300 C for 1 hr at each temperature. Infrared spectra and XRD patterns of the products produced at each temperature were recorded. In both mixtures prepared using frit and batch chemicals to represent the frit, phase formation reactions were completed within the temperature range between 900 and 1000 C. However, residual quartz was still present in glass produced from the mixture with batch chemicals even at 1100 C. Although, the phase composition and structure of the glassy products obtained from both mixtures at temperatures over 1000 C were similar, the products obtained from the mixture using actual frit were more homogeneous than those from the mixture with batch chemicals. Thus, the use of frit rather than batch chemicals reduced the temperature range of phase formation and provided for production of higher quality glass.

  14. Constitutional Environment and Entrepreneurship: An Empirical Study

    E-Print Network [OSTI]

    Zhang, Wei

    2012-01-01T23:59:59.000Z

    Malta Mauritius Moldova Montenegro Namibia NetherlandsMalta Mauritius Moldova Montenegro Namibia NetherlandsMalta Mauritius Moldova Montenegro Namibia Netherlands

  15. Adapting to Climate Change and Variability in the Great Lakes-St. Lawrence Basin Great Lakes-St. Lawrence Basin Project

    E-Print Network [OSTI]

    ; this is the adaptation component. Communication of climate change information to various publicsAdapting to Climate Change and Variability in the Great Lakes-St. Lawrence Basin 52 Great Lakes in response to potential climate change and variability. When we were preparing for this talk on what we have

  16. Proc. 4th St.Petersburg Workshop on Simulation, St.Petersburg, Russia, 2001, 233-238 Modeling and Performance Evaluation of

    E-Print Network [OSTI]

    Krivulin, Nikolai K.

    and Performance Evaluation of Computer Systems Security Operation1 D. Guster2 St.Cloud State University3 N is developed based on the fork-join queueing network formalism. We introduce a secu- rity operation performance system security, security attack, security vul- nerability, performance evaluation, fork-join queueing

  17. Efficient room temperature aqueous Sb2S3 synthesis for inorganic–organic sensitized solar cells with 5.1% efficiencies

    E-Print Network [OSTI]

    Gödel, Karl C.; Choi, Yong Chan; Roose, Bart; Sadhanala, Aditya; Snaith, Henry J.; Seok, Sang Il; Steiner, Ullrich; Pathak, Sandeep K.

    2015-04-14T23:59:59.000Z

    . Steiner and S. K. Pathak, Chem. Commun., 2015, DOI: 10.1039/C5CC01966D. Efficient room temperature aqueous Sb2S3 synthesis for inorganic-organic sensitized solar cells with 5.1% efficiencies† Karl C. Go¨del,a Yong Chan Choi,b Bart Roose,ac Aditya Sadhanala... -gu, Sungkyunkwan University, Suwon 440-746, Republic of Korea. Further, the material has been used to improve the stability of methyl-ammonium lead iodide perovskite solar cells.5 Antimony sulfide synthesis typically involves deposition in aqueous and non...

  18. Direct imaging of crystal structure and defects in metastable Ge{sub 2}Sb{sub 2}Te{sub 5} by quantitative aberration-corrected scanning transmission electron microscopy

    SciTech Connect (OSTI)

    Ross, Ulrich; Lotnyk, Andriy, E-mail: andriy.lotnyk@iom-leipzig.de; Thelander, Erik; Rauschenbach, Bernd [Leibniz Institute of Surface Modification, Permoserstr. 15, D-04318 Leipzig (Germany)

    2014-03-24T23:59:59.000Z

    Knowledge about the atomic structure and vacancy distribution in phase change materials is of foremost importance in order to understand the underlying mechanism of fast reversible phase transformation. In this Letter, by combining state-of-the-art aberration-corrected scanning transmission electron microscopy with image simulations, we are able to map the local atomic structure and composition of a textured metastable Ge{sub 2}Sb{sub 2}Te{sub 5} thin film deposited by pulsed laser deposition with excellent spatial resolution. The atomic-resolution scanning transmission electron microscopy investigations display the heterogeneous defect structure of the Ge{sub 2}Sb{sub 2}Te{sub 5} phase. The obtained results are discussed. Highly oriented Ge{sub 2}Sb{sub 2}Te{sub 5} thin films appear to be a promising approach for further atomic-resolution investigations of the phase change behavior of this material class.

  19. Molecular Beam Epitaxial Growth of Bi2Te3 and Sb2Te3 Topological Insulators on GaAs (111) Substrates: A Potential Route to Fabricate Topological Insulator p-n Junction

    E-Print Network [OSTI]

    Zhaoquan Zeng; Timothy A. Morgan; Dongsheng Fan; Chen Li; Yusuke Hirono; Xian Hu; Yanfei Zhao; Joon Sue Lee; Zhiming M. Wang; Jian Wang; Shuiqing Yu; Michael E. Hawkridge; Mourad Benamara; Gregory J. Salamo

    2013-03-11T23:59:59.000Z

    High quality Bi2Te3 and Sb2Te3 topological insulators films were epitaxially grown on GaAs (111) substrate using solid source molecular beam epitaxy. Their growth and behavior on both vicinal and non-vicinal GaAs (111) substrates were investigated by reflection high-energy electron diffraction, atomic force microscopy, x-ray diffraction, and high resolution transmission electron microscopy. It is found that non-vicinal GaAs (111) substrate is better than a vicinal substrate to provide high quality Bi2Te3 and Sb2Te3 films. Hall and magnetoresistance measurements indicate that p type Sb2Te3 and n type Bi2Te3 topological insulator films can be directly grown on a GaAs (111) substrate, which may pave a way to fabricate topological insulator p-n junction on the same substrate, compatible with the fabrication process of present semiconductor optoelectronic devices.

  20. Synthesis and crystal structure of [(C{sub 7}H{sub 10}N){sub 2}]{sup 2+} [Sb{sub 2}Cl{sub 8}]{sup 2-1}

    SciTech Connect (OSTI)

    Guo Yun, E-mail: apharm@sina.com; Zhang Miao [Zhejiang University of Technology, College of Pharmaceutical Sciences (China); Shen Liang [Hangzhou Normal University, College of Material Chemistry and Chemical Engineering (China); Jin Yingying; Jin Zhimin [Zhejiang University of Technology, College of Pharmaceutical Sciences (China)

    2010-12-15T23:59:59.000Z

    The reaction of 2,6-dimethylpyridine with SbCl{sub 3} and HCl affords the title compound, the structure of which is ascertained by X-ray diffraction. The unit cell consists of one bridged Sb{sub 2}Cl{sub 8}{sup 2-} anion and two 2,6-dimethylpyridinium cations. The trivalent antimony ion is bonded not only directly to chlorine anions, but also is coordinated with chlorine anions by secondary bonds. In the crystal, there exists infinite coordinated chains of [Sb{sub 2}Cl{sub 8}]{sub n}{sup 2n-} anions running along the a axis, which link 2,6-dimethylpyridinium cations by N-H-Cl hydrogen bonds.

  1. Social Media, Social Kids: Sociocultural Implications of 21st Century Media for Development in the Preteen Period.

    E-Print Network [OSTI]

    Tehranian, Yalda

    2013-01-01T23:59:59.000Z

    their media use is mobile technology, a new feature of theof the Internet, mobile technologies, and the rapid21 st century, as mobile technology and the Internet became

  2. The Biology and Conservation of the Damara Tern in Namibia

    E-Print Network [OSTI]

    de Villiers, Marienne

    Chapter 7 The impacts of diamond mining activities on breeding Damara Terns Sterna balaenarum in southern and faces several conservation issues. The aim of this study was to provide a description of the ecology

  3. MHK Projects/GPP Namibia | Open Energy Information

    Open Energy Info (EERE)

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

  4. Namibia-UNEP Green Economy Advisory Services | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup |JilinLu anMicrogreenMoonNASA/AmesNS Solar05Zip Category

  5. Widening the Axion Window via Kinetic and St\\"uckelberg Mixings

    E-Print Network [OSTI]

    Shiu, Gary; Ye, Fang

    2015-01-01T23:59:59.000Z

    We point out that kinetic and St\\"uckelberg mixings that are generically present in the low energy effective action of axions can significantly widen the window of axion decay constants. We show that an effective super-Planckian decay constant can be obtained even when the axion kinetic matrix has only sub-Planckian entries. Our minimal model involves only two axions, a St\\"uckelberg U(1) and a modest rank instanton generating non-Abelian group. Below the mass of the St\\"uckelberg U(1), there is only a single axion with a non-perturbatively generated potential. In contrast to previous approaches, the enhancement of the axion decay constant is not tied to the number of degrees of freedom introduced. We also discuss how kinetic mixings can lower the decay constant to the desired axion dark matter window. String theory embeddings of this scenario and their phenomenological features are briefly discussed.

  6. Microtechnology: The key to the technical challenges of the 21st century

    SciTech Connect (OSTI)

    Ceglio, N.M.

    1993-08-01T23:59:59.000Z

    Through the ages each culture and civilization has expressed its values and world view in the form of monuments derived from its most advanced and valued technologies. From pyramids to cathedrals, skyscrapers and moon rockets, our technology has enabled us to leave our mark on the landscape and in the minds of our people. In the 21st century, the compelling technology will be that of the micro-world, enabling the fabrication of structures with features smaller than the wavelengths of light. Such structures will allow use to monitor and control electrical, chemical, and optical phenomena in ways never before imagined. As in the past we will continue to create monuments, but the technological monuments of the 21st century will likely be viewed through a microscope. This report provides a discussion of microtechnology in the 21st century.

  7. Sputtering of Si, SiC, InAs, InP, Ge, GaAs, GaSb, and GaN by electrosprayed nanodroplets

    SciTech Connect (OSTI)

    Borrajo-Pelaez, Rafael; Grustan-Gutierrez, Enric; Gamero-Castaño, Manuel, E-mail: mgameroc@uci.edu [Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697 (United States)

    2013-11-14T23:59:59.000Z

    This article presents a characterization of the damage caused by energetic beams of electrosprayed nanodroplets striking the surfaces of single-crystal semiconductors including Si, SiC, InAs, InP, Ge, GaAs, GaSb, and GaN. The sputtering yield (number of atoms ejected per projectile's molecule), sputtering rate, and surface roughness are measured as functions of the beam acceleration potential. The maximum values of the sputtering yields range between 1.9 and 2.2 for the technological important but difficult to etch SiC and GaN respectively, and 4.5 for Ge. The maximum sputtering rates for the non-optimized beam flux conditions used in our experiments vary between 409?nm/min for SiC and 2381?nm/min for GaSb. The maximum sputtering rate for GaN is 630?nm/min. Surface roughness increases modestly with acceleration voltage, staying within 2?nm and 20?nm for all beamlet acceleration potentials and materials except Si. At intermediate acceleration potentials, the surface of Si is formed by craters orders of magnitude larger than the projectiles, yielding surface roughness in excess of 60?nm. The effect of projectile dose is studied in the case of Si. This parameter is correlated with the formation of the large craters typical of Si, which suggests that the accumulation of damage following consecutive impacts plays an important role in the interaction between beamlet and target.

  8. Microstructural characterization in dissimilar friction stir welding between 304 stainless steel and st37 steel

    SciTech Connect (OSTI)

    Jafarzadegan, M. [Department of Materials Eng., Tarbiat Modares University, P.O. Box: 14115-143, Tehran (Iran, Islamic Republic of) [Department of Materials Eng., Tarbiat Modares University, P.O. Box: 14115-143, Tehran (Iran, Islamic Republic of); State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin (China); Feng, A.H. [State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin (China)] [State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin (China); Abdollah-zadeh, A., E-mail: zadeh@modares.ac.ir [Department of Materials Eng., Tarbiat Modares University, P.O. Box: 14115-143, Tehran (Iran, Islamic Republic of); Saeid, T. [Advanced Materials Research Center, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz (Iran, Islamic Republic of)] [Advanced Materials Research Center, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz (Iran, Islamic Republic of); Shen, J. [State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin (China)] [State Key Laboratory of Advanced Welding Production Technology, School of Materials Science and Eng., Harbin Institute of Technology, P.O. Box: 150001, Harbin (China); Assadi, H. [Department of Materials Eng., Tarbiat Modares University, P.O. Box: 14115-143, Tehran (Iran, Islamic Republic of)] [Department of Materials Eng., Tarbiat Modares University, P.O. Box: 14115-143, Tehran (Iran, Islamic Republic of)

    2012-12-15T23:59:59.000Z

    In the present study, 3 mm-thick plates of 304 stainless steel and st37 steel were welded together by friction stir welding at a welding speed of 50 mm/min and tool rotational speed of 400 and 800 rpm. X-ray diffraction test was carried out to study the phases which might be formed in the welds. Metallographic examinations, and tensile and microhardness tests were used to analyze the microstructure and mechanical properties of the joint. Four different zones were found in the weld area except the base metals. In the stir zone of the 304 stainless steel, a refined grain structure with some features of dynamic recrystallization was evidenced. A thermomechanically-affected zone was characterized on the 304 steel side with features of dynamic recovery. In the other side of the stir zone, the hot deformation of the st37 steel in the austenite region produced small austenite grains and these grains transformed to fine ferrite and pearlite and some products of displacive transformations such as Widmanstatten ferrite and martensite by cooling the material after friction stir welding. The heat-affected zone in the st37 steel side showed partially and fully refined microstructures like fusion welding processes. The recrystallization in the 304 steel and the transformations in the st37 steel enhanced the hardness of the weld area and therefore, improved the tensile properties of the joint. - Highlights: Black-Right-Pointing-Pointer FSW produced sound welds between st37 low carbon steel and 304 stainless steel. Black-Right-Pointing-Pointer The SZ of the st37 steel contained some products of allotropic transformation. Black-Right-Pointing-Pointer The material in the SZ of the 304 steel showed features of dynamic recrystallization. Black-Right-Pointing-Pointer The finer microstructure in the SZ increased the hardness and tensile strength.

  9. Ordered and disordered polymorphs of Na(Ni2/3Sb1/3)O?: Honeycomb-ordered cathodes for Na-ion batteries

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

    Ma, Jeffrey; Wu, Lijun; Bo, Shou -Hang; Khalifah, Peter G.; Grey, Clare P.; Zhu, Yimei

    2015-04-14T23:59:59.000Z

    Na-ion batteries are appealing alternatives to Li-ion battery systems for large-scale energy storage applications in which elemental cost and abundance are important. Although it is difficult to find Na-ion batteries which achieve substantial specific capacities at voltages above 3 V (vs Na?/Na), the honeycomb-layered compound Na(Ni2/3Sb1/3)O? can deliver up to 130 mAh/g of capacity at voltages above 3 V with this capacity concentrated in plateaus at 3.27 and 3.64 V. Comprehensive crystallographic studies have been carried out in order to understand the role of disorder in this system which can be prepared in both “disordered” and “ordered” forms, depending onmore »the synthesis conditions. The average structure of Na(Ni2/3Sb1/3)O? is always found to adopt an O3-type stacking sequence, though different structures for the disordered (R3?m, #166, a = b = 3.06253(3) Å and c = 16.05192(7) Å) and ordered variants (C2/m, #12, a = 5.30458(1) Å, b = 9.18432(1) Å, c = 5.62742(1) Å and ? = 108.2797(2)°) are demonstrated through the combined Rietveld refinement of synchrotron X-ray and time-of-flight neutron powder diffraction data. However, pair distribution function studies find that the local structure of disordered Na(Ni2/3Sb1/3)O? is more correctly described using the honeycomb-ordered structural model, and solid state NMR studies confirm that the well-developed honeycomb ordering of Ni and Sb cations within the transition metal layers is indistinguishable from that of the ordered phase. The disorder is instead found to mainly occur perpendicular to the honeycomb layers with an observed coherence length of not much more than 1 nm seen in electron diffraction studies. When the Na environment is probed through ²³Na solid state NMR, no evidence is found for prismatic Na environments, and a bulk diffraction analysis finds no evidence of conventional stacking faults. The lack of long range coherence is instead attributed to disorder among the three possible choices for distributing Ni and Sb cations into a honeycomb lattice in each transition metal layer. It is observed that the full theoretical discharge capacity expected for a Ni³?/²? redox couple (133 mAh/g) can be achieved for the ordered variant but not for the disordered variant (~110 mAh/g). The first 3.27 V plateau during charging is found to be associated with a two-phase O3 ? P3 structural transition, with the P3 stacking sequence persisting throughout all further stages of desodiation.« less

  10. St. Lucie County, Florida, Summary of Reported Data From July 1, 2010 Â… September 30, 2013

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOriginEducationVideo »UsageSecretaryVideosSpring O&M Users Group MeetingSpyware.pdfSt.St.

  11. Proc. of 2nd Intern. Workshop "New Models of Business: Managerial Aspects and Enabling Technology", St. Petersburg State University, St. Petersburg, Russia, June 26-28, 2002, 212-220

    E-Print Network [OSTI]

    Krivulin, Nikolai K.

    Proc. of 2nd Intern. Workshop "New Models of Business: Managerial Aspects and Enabling Technology, the information systems normally provide for modeling of business processes on the basis of both mathematical", St. Petersburg State University, St. Petersburg, Russia, June 26-28, 2002, 212-220 Algebraic Modeling

  12. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE Market Power and Collusion on Interconnection

    E-Print Network [OSTI]

    Boyer, Edmond

    GROUPE D'ANALYSE ET DE THÉORIE ÉCONOMIQUE LYON - ST ÉTIENNE WP 1411 Market Power and Collusion'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin des Mouilles 69130 Ecully ­ France Tel. +33 (0 competitors such as competition (Laffont and Tirole (2002)), collusion (Debbichi and Hichri (2013b), Parker

  13. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE La critique saint-simonienne de la secte des

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    'une approche sp´ecifique, op- posant oisifs et travailleurs. Cette partition modifie les d´ebats classiquesGROUPE D'ANALYSE ET DE THÉORIE ÉCONOMIQUE LYON - ST ÉTIENNE WP 1409 La critique saint-simonienne de|WorkingPapers #12;GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin des Mouilles 69130

  14. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE A Field Study of Chinese Migrant Workers' Attitudes

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    GROUPE D'ANALYSE ET DE THÉORIE ÉCONOMIQUE LYON - ST ÉTIENNE WP 1418 A Field Study of Chinese-28May2014 #12;GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin des Mouilles University, 4400 University Drive, MSN 1B2, Fairfax, VA 22030 USA. Lei Mao: mao@gate.cnrs.fr , Université de

  15. 2007 Raj JainCSE571SWashington University in St. Louis Secure Socket Layer (SSL)Secure Socket Layer (SSL)

    E-Print Network [OSTI]

    Jain, Raj

    15-1 ©2007 Raj JainCSE571SWashington University in St. Louis Secure Socket Layer (SSL)Secure Socket Layer (SSL) and Transport Layerand Transport Layer Security (TLS)Security (TLS) Raj Jain Washington in St. Louis OverviewOverview History and overview of SSL/TLS Products and Implementations Datagram

  16. 2009 Raj JainCSE571SWashington University in St. Louis Secure Socket Layer (SSL)Secure Socket Layer (SSL)

    E-Print Network [OSTI]

    Jain, Raj

    15-1 ©2009 Raj JainCSE571SWashington University in St. Louis Secure Socket Layer (SSL)Secure Socket Layer (SSL) and Transport Layerand Transport Layer Security (TLS)Security (TLS) Raj Jain Washington in St. Louis OverviewOverview History and overview of SSL/TLS Products and Implementations Datagram

  17. Marine and Petroleum Geology 25 (2008) 271288 Surface and subsurface signatures of gas seepage in the St. Lawrence

    E-Print Network [OSTI]

    Long, Bernard

    2008-01-01T23:59:59.000Z

    parts of the St. Lawrence platform and suggest the presence of a mature hydrocarbon source an open-window to the petroleum system and provide indirect evidence for the presence of mature source are characterized by seismic chimneys that may be traced down to the autochthonous Paleozoic rocks (St. Lawrence

  18. Deliverable for F?ST project: Ln Resin based PLE

    SciTech Connect (OSTI)

    Peterson, Dominic S. [Los Alamos National Laboratory; Armenta, Claudine E. [Los Alamos National Laboratory; Rim, Jung H. [Los Alamos National Laboratory

    2012-05-03T23:59:59.000Z

    This memo describes the fabrication of a polymer ligand extractant based on Eichrom's LN-1 resin. This work has been in support of the Fast Alpha Spectrometry Tool (F{alpha}ST) project. The first part of LANL's role in this project is to evaluate new extractants for use in polymer ligand extractants (PLEs). The first new extractant evaluated is Di(2-ethyl hexyl) phosphoric acid (HDEHP), which is an effective metal extractant. It has very efficient chelating properties for a wide variety of metal ions. HDEHP is an amphiphillic molecule with two long hydrocarbon chains and a polar end with a phosphoryl oxygen (P=O) and an acidic -OH group as shown in Figure 1. HDEHP has shown effectiveness in extracting lanthanides, selective actinides, and other trivalent elements. Several authors have reported that lanthanides and elements with +3 oxidation state have similar extraction behavior in nitric acid. The distribution ratio for lanthanides rapidly decreases at lower nitric concentration then start to increase at higher concentration as shown in. The trivalent americium, curium, and yttrium exhibit similar trend as trivalent lanthanides. This extraction trend can be also observed from hydrogen chloride solution. This work describes the use of this ligand in a PLE to extract plutonium from solution. Polymer ligand films were prepared by dissolving HDEHP ligands and polystyrene beads in THF. The solution was directly deposited onto a 40 mm diameter stainless steel substrate using an automated pipette. HDEHP based PLEs with direct stippling method are shown in Figure 2. The solution was air dried at room temperature overnight to ensure complete evaporation of THF. The plutonium tracer solution was prepared in 0.01, 0.1, 1, and 8M nitric solutions to study the effect of nitric concentration in plutonium extraction. 0.1667 Bq {sup 239}Pu tracer solution was directly stippled on each PLE and was allowed to equilibrate for 3 hours before removing the solution. The plutonium activity of each sample was measured by direct alpha counting to quantify the plutonium recovery by HDEHP PLE. The alpha spectra from alpha spectroscopy are shown in Figure 3. 1:5, 1:10, and 1:20 PLEs had sharp peak with low tailing. 1:2 had an extremely long tail, which is a possible indication that a large amount of ligands caused the film to not form a smooth surface. Also, it can be noted that 1:2 ratio PLE surface was not as rigid as the other ratio PLEs and it was prone to scratching during sample handing. The resolution of alpha spectra was quantified by measuring Full Width at Half of the Maximum (FWHM) using Bortels equation. The tailing component of the peak was also measured along with FWHM. The peak resolutions and tailing measurements for 0.1M nitric solution samples are given in Table 1. The best resolution was achieved with 1:5 PLE and worst was given by 1:2 PLE. The plutonium recovery by HDEHP PLE was dependent on both nitric concentration and ligand to polymer ratio. 1:2 PLE consistently had the highest recovery followed by 1:5 as shown in Figure 4. It should be noted that 1:2 ratio PLEs consistently had long tailing and the ROI of the spectrum had to be increased to encompass total counts from the tracer. 1:10 and 1:20 PLEs had close to zero percent recovery in all nitric concentration except for 0.01M. The highest plutonium recovery was observed for 0.1M nitric acid. 1:5 PLE gave the best combination of alpha spectroscopy resolution and plutonium recovery. Radiography image of samples were generated to study the plutonium distribution on the PLE surface. Samples were placed on an imaging plate (Fujifilm BAS-TR 2025) for 24 hours and the plate was scanned using GE Typhoon FLA 7000 system. The radiography image in Figure 5 shows uneven distribution with hot spots along the edge and in the center of the samples. These hot spots may be the result of highly localized concentration of ligands or surface defects that were observed in SEM. This unevenness in distribution may cause inaccurate activity measurement by alpha spectroscopy due to a bias in the

  19. Molecular beam epitaxy growth and characterization of type-II InAs/GaSb strained layer superlattices for long-wave infrared detection

    E-Print Network [OSTI]

    New Mexico, University of

    . Sharma, and S. Krishna Center for High Technology Materials, University of New Mexico, 1313 Goddard St SE, Albuquerque, New Mexico 87106 S. J. Lee and S. K. Noh Korea Research Institute Standards and Science (KRISS imaging. It includes satellite-based surveillance, atmo- spheric pollution probes, and astrophysical

  20. Crystal structure and high temperature transport properties of Yb-filled p-type skutterudites Yb{sub x}Co{sub 2.5}Fe{sub 1.5}Sb{sub 12}

    SciTech Connect (OSTI)

    Dong, Yongkwan [Department of Physics, University of South Florida, Tampa, FL 33620 (United States); Puneet, Pooja; Tritt, Terry M. [Department of Physics and Astronomy, Kinard Laboratory, Clemson University, Clemson, SC 29634 (United States); Nolas, George S., E-mail: gnolas@usf.edu [Department of Physics, University of South Florida, Tampa, FL 33620 (United States)

    2014-01-15T23:59:59.000Z

    Partially Yb-filled Fe substituted polycrystalline p-type skutterudites with nominal compositions Yb{sub x}Co{sub 2.5}Fe{sub 1.5}Sb{sub 12}, with varying filler concentrations x, were synthesized by reacting the constituent elements and subsequent solid state annealing, followed by densification by hot-pressing. The compositions and filling fractions were confirmed with a combination of Rietveld refinement and elemental analysis. Their thermoelectric properties were evaluated from 300 to 800 K. The Seebeck coefficients for the specimens increase with increasing temperature and plateau at around 750 K. The thermal conductivity decreases with increasing Yb filling fraction, and bipolar conduction becomes evident and increases at elevated temperatures. A maximum ZT value of 0.8 was obtained at 750 K for Yb{sub 0.47}Co{sub 2.6}Fe{sub 1.4}Sb{sub 12}. The thermoelectric properties and potential for further optimization are discussed in light of our results. - Graphical abstract: Display Omitted - Highlights: • Yb-filled Fe-substituted p-type CoSb{sub 3} skutterudites, Yb{sub x}Co{sub 2.5}Fe{sub 1.5}Sb{sub 12}, were structurally and physically characterized. • Both filling fraction and Co-to-Fe ratio affect the transport properties. • High ZT was obtained for the composition with ?50% Yb filling and a slightly lower than nominal Fe content.

  1. Inverter Eligibility Listing Procedure for Solar Electric Incentive Programs Updated 6/2/14 Senate Bill 1 (SB1) defines the solar incentive programs for California, and inverters must be listed on

    E-Print Network [OSTI]

    (Maximum Continuous Output Power, Conversion Efficiency, and Tare Losses) and weighted inverter efficiencyInverter Eligibility Listing Procedure for Solar Electric Incentive Programs Updated 6/2/14 Senate Bill 1 (SB1) defines the solar incentive programs for California, and inverters must be listed

  2. MedicineUndergradUate stUdy We offer many opportunities for you to

    E-Print Network [OSTI]

    Guo, Zaoyang

    MedicineUndergradUate stUdy #12;Visit us We offer many opportunities for you to visit us and find;Medicine is based in our Wolfson Medical School Building on the main campus. #12;Medicine Medicine is about-centredlearning,andhasaspiral course structure. This means that you will revisit topics on several occasions as you progress through

  3. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1332

    E-Print Network [OSTI]

    Boyer, Edmond

    WP 1332 Utilitarianism and anti-utilitarianism Antoinette Baujard; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin economists in public decision are likely to be normatively transparent. JEL Codes: A13,A33,B10,B2, D63 Key

  4. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1401

    E-Print Network [OSTI]

    Boyer, Edmond

    WP 1401 Spatial targeting of agri-environmental policy and urban; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin;1 Spatial targeting of agri-environmental policy and urban development Thomas Coisnona , Walid Oueslatia,b

  5. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1330

    E-Print Network [OSTI]

    Boyer, Edmond

    WP 1330 Does Inflation Targeting Matter? An Experimental Investigation; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin for inflation to the public, (b) a clear central bank's mandate to pursue inflation stabilization as the primary

  6. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1239

    E-Print Network [OSTI]

    Boyer, Edmond

    WP 1239 The geometry of voting power: weighted voting and hyper; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin) Professors R and B cast 1 vote each, Professor G (the Department's Chair) casts 2 votes, and approval

  7. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE W P 1231

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin^ole auquel les zones b´en´eficiant des dispositifs pourront ^etre compar´ees ; d'autre part, rendre compte exemptions programs has to take up two main challenges : constructing a good control group for the targeted

  8. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1311

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1311 Interactions entre stratégies de promotion et fusions Laurent; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemina et 1983b), nous introduisons deux types de promotions, l'une étant prédatrice et l

  9. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1406

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Lyon 2, Lyon, F-69007, France. GATE: 93, Chemin des Mouilles, B.P. 167, 69131 Ecully, France. Tél : 04 WP 1406 Willingness-to-pay for road safety improvement; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin

  10. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1314

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1314 Value judgments and economics expertise Antoinette Baujard; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin- mendation, expertise, neutrality, demarcation . JEL-Code: A13, B41, D63 Université de Lyon, Lyon, F-69007

  11. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1333

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1333 Welfare economics Antoinette Baujard November 2013; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin Sen, and the theory of fair allocation by Marc Fleurbaey. JEL Code: B2, D6 Key-words: Welfare

  12. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1317

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1317 Literature review of the decision-making determinants related; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin TO THE INFLUENZA VACCINATION POLICY Maria Laura Silvaa,b , Lionel Perriera,c , Jean Marie Cohenb , Anne Mosnierb

  13. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1414

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1414 A geometric examination of majorities based on difference Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin des: option a is preferred to option b if the sum of the intensities for a exceeds the aggregated intensity

  14. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1403

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1403 Ambiguity on audits and coopération in a public goods game; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin@gate.cnrs.fr. b Department of Economics and Business, Universitat Pompeu Fabra and Barcelona Graduate School

  15. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1334

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    WP 1334 Abram Bergson Antoinette Baujard November 2013; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin highlighted. JEL-Codes: B21,B24,B31 Key-words: Bergson, Burk, Welfare economics, Sovietology Abram Bergson

  16. GROUPE D'ANALYSE ET DE THORIE CONOMIQUE LYON -ST TIENNE WP 1320

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    -Etienne, Ecully, F-69130, France Contact : 93, chemin des Mouilles - B.P.167 - 69131 - ECULLY cedex Email WP 1320 The determinants of recidivism among ex-prisoners: a survival; GATE Groupe d'Analyse et de Théorie Économique Lyon-St Étienne 93, chemin

  17. Denman Forestry Issues Series: Calculating the Sustainable Harvest in the 21st Century

    E-Print Network [OSTI]

    Borenstein, Elhanan

    Denman Forestry Issues Series: Calculating the Sustainable Harvest in the 21st Century Most recent revision March 1, 2001 Denman Program Success Despite Rock 'n Roll The February 28th Denman Forestry Issues, Eatonville, WA Public Comment The Forestry Feedback Discussion Board is available for persons wishing

  18. Optimal Siting of Regional Fecal Sludge Treatment Facilities: St. Elizabeth, Jamaica

    E-Print Network [OSTI]

    Vogel, Richard M.

    Optimal Siting of Regional Fecal Sludge Treatment Facilities: St. Elizabeth, Jamaica Ana Martha- ated with their mismanagement and deterioration. Historically, fecal sludge management has been-9496 2008 134:1 55 CE Database subject headings: Sludge; System analysis; Waste stabilization ponds

  19. Showcase Guidelines for Student Projects Engineering East -The Cube and 1st

    E-Print Network [OSTI]

    Fernandez, Eduardo

    · Geomatics Engineering Design I and II ­ SUR 4670 and SUR 4672 · Ocean Systems Control and Design ­ EOC 4804 · Ocean Engineering Systems Design Project ­ EOC 4804L 2. Teams that have won awards but have projects tooShowcase Guidelines for Student Projects Engineering East - The Cube and 1st Floor Hallway 1

  20. ADVANCED COAL & ENERGY RESEARCH FACILITY (ACERF) Washington University in St. Louis

    E-Print Network [OSTI]

    Subramanian, Venkat

    ADVANCED COAL & ENERGY RESEARCH FACILITY (ACERF) Washington University in St. Louis Overview The Advanced Coal and Energy Research Facility provides for pilot-scale research and development of new b d Ongoing Research Activities Oxy-coal combustion faculty and students within the U.S. and abroad