National Library of Energy BETA

Sample records for 1-800-553-6847 tdd 703-487-4639


    E-Print Network [OSTI]

    Telephone: 1-800-553-6847 or (703) 605-6000 Fax: (703) 321-8547 Internet: http, New Mexico 87545 B. Rogers Dartmouth College, Hanover New Hampshire 03755 J.L. Lowrance, V. J


    E-Print Network [OSTI]

    Telephone: 1-800-553-6847 or (703) 605-6000 Fax: (703) 321-8547 Internet: http Angeles, California 5) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 6) Columbia University

  3. Multi-hop relaying networks in TDD-CDMA systems 

    E-Print Network [OSTI]

    Rouse, Thomas S

    The communications phenomena at the end of the 20th century were the Internet and mobile telephony. Now, entering the new millennium, an effective combination of the two should become a similarly everyday experience. ...

  4. Transmitter based techniques for ISI and MAI mitigation in CDMA-TDD downlink 

    E-Print Network [OSTI]

    Georgoulis, Stamatis L

    The third-generation (3G) of mobile communications systems aim to provide enhanced voice, text and data services to the user. These demands give rise to the complexity and power consumption of the user equipment (UE) ...

  5. Transmission Techniques and Channel Calibration for Spatial Interweave TDD Cognitive Radio

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , Symantec, Monaco Telecom, SAP, iABG and by the EU FP7 projects CROWN, SACRA, WHERE2 and NEWCOM Systems Francesco Negro, Boris Kouassi, Irfan Ghauri, Luc Deneire, and Dirk T.M. Slock Abstract--We study the problem of beamforming design for a Cognitive Radio (CR) system in which a multiple-input multiple- output

  6. Direct Loan Servicing Centers for Students [includes PUT loans] For questions about loan repayment or other loan servicing issues, a borrower can contact his or her loan

    E-Print Network [OSTI]

    Grishok, Alla

    Servicing Center Phone: 800/848-0979 TDD/TTY: 800/848-0983 Overseas: 315/738-6634 Web site: www New York State TDD/TTY: 800/855-2880 outside New York State Web site: FedLoan Servicing (PHEAA) Phone: 800/699-2908 TDD/TTY: 800/722-8189 Overseas borrowers: 717-720-1985 Web site: www

  7. C~opyright ,f;. 2CC7 by the Americ-1n Psycholu~tc,tl A.ssnctattnn. All rif;ht~ reserved. Except,,, permmed under the Lnited States Cnpynght .Act uf 1'!76, n,, part of thi.s

    E-Print Network [OSTI]

    Townsend, James T.

    -2984 Tel: (800) 374-2721 Direct: (202) 336-5510 F:1x: (202) 336-5502 TDD/TTY: (202) .316-6123 Online:

  8. Temperature-dependent light-output characteristics of GaInN light-emitting diodes with different dislocation densities

    SciTech Connect (OSTI)

    Chhajed, Sameer; Cho, Jaehee; Schubert, E. Fred; Kim, Jong Kyu; Koleske, Daniel D.; Crawford, Mary H.


    We have experimentally investigated the temperature dependence of optical-output power of light-emitting diodes (LEDs) with different threading dislocation densities (TDDs) to assess the influence of the TDD on the temperature stability of LEDs. Whereas the LED with high TDD shows a 64% decrease in optical-output power when the ambient temperature increases from 20 to 150?°C, the LED with low TDD shows only a 54% decrease. The temperature dependence of the optical-output power and current dependence of the characteristic temperature T{sub ch} of LEDs shows that short radiative recombination lifetime and low TDDs are essential to obtain LED characteristics that are tolerant of high temperatures.


    SciTech Connect (OSTI)

    Fellinger, A.


    The Engineering and Technology Office of Waste Processing identifies and reduces engineering and technical risks associated with key waste processing project decisions. The risks, and actions taken to mitigate those risks, are determined through technology readiness assessments, program reviews, technology information exchanges, external technical reviews, technical assistance, and targeted technology development and deployment (TDD). The Office of Waste Processing TDD program prioritizes and approves research and development scopes of work that address nuclear safety related to processing of highly radioactive nuclear wastes. Thirteen of the thirty-five R&D approved work scopes in FY2009 relate directly to nuclear safety, and are presented in this report.

  10. Page 1 of 1 Policies of the University of North Texas

    E-Print Network [OSTI]

    Page 1 of 1 Policies of the University of North Texas Chapter 4 Administration Americans with Disabilities Act Policy Statement. It is the policy of the University of North Texas not to discriminate of the University Union. Telephone: (940) 565- 3804 or TDD access through Relay Texas 1-800-735-2989. Suggestions

  11. Challenges in epitaxial growth of SiGe buffers on Si (111), (110), and (112) Minjoo L. Lee a,b,*, Dimitri A. Antoniadis a

    E-Print Network [OSTI]

    Haller, Gary L.

    Challenges in epitaxial growth of SiGe buffers on Si (111), (110), and (112) Minjoo L. Lee a The growth of SiGe on surfaces other than Si(001) is of interest in VLSI technology both for realizing novel-mismatch SiGe films grown on Si(111), (110), and (112) possess threading dislocation densities (TDD) >10Â

  12. High-electron-mobility GaN grown on free-standing GaN templates by ammonia-based molecular beam epitaxy

    SciTech Connect (OSTI)

    Kyle, Erin C. H., E-mail:; Kaun, Stephen W.; Burke, Peter G.; Wu, Feng; Speck, James S. [Materials Department, University of California, Santa Barbara, California 93106 (United States); Wu, Yuh-Renn [Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University, Taipei City 10617, Taiwan (China)


    The dependence of electron mobility on growth conditions and threading dislocation density (TDD) was studied for n{sup ?}-GaN layers grown by ammonia-based molecular beam epitaxy. Electron mobility was found to strongly depend on TDD, growth temperature, and Si-doping concentration. Temperature-dependent Hall data were fit to established transport and charge-balance equations. Dislocation scattering was analyzed over a wide range of TDDs (?2?×?10{sup 6}?cm{sup ?2} to ?2?×?10{sup 10}?cm{sup ?2}) on GaN films grown under similar conditions. A correlation between TDD and fitted acceptor states was observed, corresponding to an acceptor state for almost every c lattice translation along each threading dislocation. Optimized GaN growth on free-standing GaN templates with a low TDD (?2?×?10{sup 6}?cm{sup ?2}) resulted in electron mobilities of 1265 cm{sup 2}/Vs at 296?K and 3327 cm{sup 2}/Vs at 113?K.

  13. Proceedings of the 2002 Fire Conference: Managing

    E-Print Network [OSTI]

    Standiford, Richard B.

    Proceedings of the 2002 Fire Conference: Managing Fire and Fuels in the Remaining Wildlands., technical coordinator. 2008. Proceedings of the 2002 fire conference: managing fire and fuels) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. #12;Proceedings of the 2002

  14. Water Resources Management Practicum 2005 Nelson Institute for Environmental Studies

    E-Print Network [OSTI]

    Sheridan, Jennifer

    Water Resources Management Practicum 2005 Nelson Institute for Environmental Studies University Context 2006 #12;#12;Water Resources Management Practicum 2005 Nelson Institute for Environmental Studies/263-2741 (voice/TDD), for information and referral. The Water Resources Management Practicum is a regular part


    E-Print Network [OSTI]

    Gelfond, Michael

    2012-2013 CLINICAL PSYCHOLOGY DOCTORAL PROGRAM GRADUATE STUDENT HANDBOOK The Texas Tech Univeristy Clinical Psychology docotral program is accredited by the American Psychological Association American, DC 20002-4242 Phone: (202) 336-5500, TDD: (202) 336-6123 #12;TTU Clinical Psychology Doctoral Program


    E-Print Network [OSTI]

    Guiltinan, Mark

    Department of Environmental Protection (Department) regulations to the revised Federal regulations may use the AT&T Relay Service, (800) 654-5984 (TDD users) or (800) 654- 5988 (voice users ''appropriate vegetated buffers and setbacks . . . to protect and maintain water quality.'' The final Chapter 91

  17. GaN-Ready Aluminum Nitride Substrates for Cost-Effective, Very Low Dislocation Density III-Nitride LED's

    SciTech Connect (OSTI)

    Sandra Schujman; Leo Schowalter


    The objective of this project was to develop and then demonstrate the efficacy of a costeffective approach for a low defect density substrate on which AlInGaN LEDs can be fabricated. The efficacy of this “GaN-ready” substrate would then be tested by growing high efficiency, long lifetime InxGa1-xN blue LEDs. The approach used to meet the project objectives was to start with low dislocation density AlN single-crystal substrates and grow graded AlxGa1-xN layers on top. Pseudomorphic AlxGa1-xN epitaxial layers grown on bulk AlN substrates were used to fabricate light emitting diodes and demonstrate better device performance as a result of the low defect density in these layers when benched marked against state-of-the-art LEDs fabricated on sapphire substrates. The pseudomorphic LEDs showed excellent output powers compared to similar wavelength devices grown on sapphire substrates, with lifetimes exceeding 10,000 hours (which was the longest time that could reliably be estimated). In addition, high internal quantum efficiencies were demonstrated at high driving current densities even though the external quantum efficiencies were low due to poor photon extraction. Unfortunately, these pseudomorphic LEDs require high Al content so they emit in the ultraviolet. Sapphire based LEDs typically have threading dislocation densities (TDD) > 108 cm-2 while the pseudomorphic LEDs have TDD ? 105 cm-2. The resulting TDD, when grading the AlxGa1-xN layer all the way to pure GaN to produce a “GaN-ready” substrate, has varied between the mid 108 down to the 106 cm-2. These inconsistencies are not well understood. Finally, an approach to improve the LED structures on AlN substrates for light extraction efficiency was developed by thinning and roughening the substrate.

  18. Chemical Weed and Brush Control: Suggestions for Rangeland

    E-Print Network [OSTI]

    McGinty, Allan; Ansley, Jim; Cadenhead, J. F.; Hamilton, Wayne T.; Hanselka, C. Wayne; Hart, Charles R.; Ueckert, Darrell


    quick way to identify plants. Accurate plant identification is critical for selecting proper control technologies. TDD uses digital images and the internet to provide this service. Contact your County Extension Agent to learn more about this program... dicamba 3,6-dichloro-2-methoxybenzoic acid Banvel, clarity 4 lbs ./gal . dicamba:2,4-d(1:3) see dicamba and 2,4-d weedmaster, Banvel + d, rangestar 4 lbs ./gal . diesel fuel oil or kerosene refined petroleum fractions several manufacturers glyphosate n...

  19. W E 1 S H I P S L L L L L L

    E-Print Network [OSTI]

    rd L . 4 No. - I . . PPP ITT,,+T; pwTTT$TJ, ppp i SIGNIFICANT LEVELS 1st.5 t h .I=.L m l 2nd w.1 4th.8th..t~L-l Na H0.t -,( ( I P P P T T T T Td d l PPP TT$$Tx PPP TT$$T, PPP TT$TdTXGG g I I ,. i i N a our ; I I I hhh dd I f hhh TT$$TxTdd II hhh TT$$T, dd I f G

  20. In-Tank Elutriation Test Report And Independent Assessment

    SciTech Connect (OSTI)

    Burns, H. H.; Adamson, D. J.; Qureshi, Z. H.; Steeper, T. J.


    The Department of Energy (DOE) Office of Environmental Management (EM) funded Technology Development and Deployment (TDD) to solve technical problems associated with waste tank closure for sites such as Hanford Site and Savannah River Site (SRS). One of the tasks supported by this funding at Savannah River National Laboratory (SRNL) and Pacific Northwest Laboratory (PNNL) was In-Tank Elutriation. Elutriation is the process whereby physical separation occurs based on particle size and density. This report satisfies the first phase of Task WP_1.3.1.1 In-Tank Elutriation, which is to assess the feasibility of this method of separation in waste tanks at Hanford Site and SRS. This report includes an analysis of scoping tests performed in the Engineering Development Laboratory of SRNL, analysis of Hanford's inadvertent elutriation, the viability of separation methods such as elutriation and hydrocyclones and recommendations for a path forward. This report will demonstrate that the retrieval of Hanford salt waste tank S-112 very successfully decreased the tank's inventories of radionuclides. Analyses of samples collected from the tank showed that concentrations of the major radionuclides Cs-136 and Sr-90 were decreased by factors of 250 and 6 and their total curie tank inventories decreased by factors of 60,000 and 2000. The total tank curie loading decreased from 300,000 Ci to 55 Ci. The remaining heel was nearly all innocuous gibbsite, Al(OH){sub 3}. However, in the process of tank retrieval approximately 85% of the tank gibbsite was also removed. Significant amounts of money and processing time could be saved if more gibbsite could be left in tanks while still removing nearly all of the radionuclides. There were factors which helped to make the elutriation of Tank S-112 successful which would not necessarily be present in all salt tanks. 1. The gibbsite particles in the tank were surprisingly large, as much as 200 {micro}m. The gibbsite crystals had probably grown in size over a period of decades. 2. The radionuclides were apparently either in the form of soluble compounds, like cesium, or micrometer sized particles of actinide oxides or hydroxides. 3. After the initial tank retrieval the tank contained cobble which is not conducive to elutriation. Only after the tank contents were treated with thousands of gallons of 50 wt% caustic, were the solids converted to sand which is compatible with elutriation. Discussions between SRNL and PNNL resulted in plans to test elutriation in two phases; in Phase 1 particles would be separated by differences in settling velocity in an existing scaled tank with its associated hardware and in Phase 2 additional hardware, such as a hydrocyclone, would be added downstream to separate slow settling partciels from liquid. Phase 1 of in-tank elutriation was tested for Proof of Principle in theEngineering Development Laboratory of SRNL in a 41" diameter, 87 gallon tank. The tank had been previously used as a 1/22 scale model of Hanford Waste Tank AY-102. The objective of the testing was to determine which tank operating parameters achieved the best separation between fast- and slow-settling particles. For Phase 1 testing a simulated waste tank supernatant, slow-settling particles and fast-settling particles were loaded to the scaled tank. Because this was a Proof of Principle test, readily available solids particles were used that represented fast-settling and slow-settling particles. The tank contents were agitated using rotating mixer jet pumps (MJP) which suspended solids while liquids and solids were drawn out of the tank with a suction tube. The goal was to determine the optimum hydraulic operating conditions to achieve clean separation in which the residual solids in the tank were nearly all fast-settling particles and the solids transferred out of the tank were nearly all slow-settling particles. Tests were conducted at different pump jet velocities, suction tube diameters and suction tube elevations. Testing revealed that the most important variable was jet velocity which translates to a d