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0.52eV Quaternary InGaAsSb Thermophotovoltaic Diode Technology

Description: 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… more
Date: June 9, 2004
Creator: Dashiell, M. W.; Beausang, J. F.; Nichols, G.; Depoy, D. M.; Danielson, L. R.; Ehsani, H. et al.
Item Type: Refine your search to only Report
open access

2005 AF Base Realignment and Closure (BRAC 2005) Site Survey Guidance

Description: SAF/IEB will oversee a series ofMAJCOM directed site surveys for bases affected by BRAC 2005 recommendations. These site surveys are the first step in identifying BRAC 2005 operational, communications and construction requirements for use in future programming actions. Attached is the installation site survey priority list (Atch I).
Date: June 9, 2005
Creator: United States. Department of Defense.
Item Type: Refine your search to only Text
open access

2005 BRAC Implementation Guidance

Description: The analysis phase of the BRAC 2005 effort is coming to a close. It is time to consider implementation guidance and how it affects you. Initial guidance is being prepared to help you during preliminary BRAC implementation planning. The basic preparation for closure or realignment is similar to what bases and MAJCOMs went through during the last four BRAC rounds. Details might differ but the end result will be the same.
Date: June 9, 2005
Creator: United States. Department of Defense.
Item Type: Refine your search to only Text
open access

Acceleration of calcite kinetics by abalone nacre proteins

Description: The fascinating shapes and hierarchical designs of biomineralized structures have long been an inspiration to materials scientists because of the potential they suggest for biomolecular control over synthesis of crystalline materials. One prevailing view is that mineral-associated macromolecules are responsible for initiating and stabilizing non-equilibrium crystal polymorphs and morphologies through interactions between anionic moieties and cations in solution or at mineral surfaces. Indeed, n… more
Date: June 9, 2005
Creator: Fu, G.; Qiu, S. R.; Orme, C. A.; Morse, D. E. & De Yoreo, J. J.
Item Type: Refine your search to only Article
open access

Acoustic emission from beryllium

Description: The acoustic emission from both powder and ingot source beryllium has been measured as a function of strain and prior heat treatment. Most measurements were made during tensile deformation, but a limited number of compression tests have also been performed. The acoustic emission observed was of the burst type, with little or no contribution from continuous type emission. The emission was characterized by the variation of burst rate and average energy per burst as a function of strain. The tensi… more
Date: June 9, 1976
Creator: Heiple, C. R. & Adams, R. O.
Item Type: Refine your search to only Report
open access

Aerial Radiological Surveys

Description: Measuring terrestrial gamma radiation from airborne platforms has proved to be a useful method for characterizing radiation levels over large areas. Over 300 aerial radiological surveys have been carried out over the past 25 years including U.S. Department of Energy (DOE) sites, commercial nuclear power plants, Formerly Utilized Sites Remedial Action Program/Uranium Mine Tailing Remedial Action Program (FUSRAP/UMTRAP) sites, nuclear weapons test sites, contaminated industrial areas, and nuclear… more
Date: June 9, 1997
Creator: Proctor, A. E.
Item Type: Refine your search to only Report
open access

Africa: U.S. Foreign Assistance Issues

Description: This report discusses the issue of U.S. economic assistance to sub-Saharan Africa, highlighting the importance of continued assistance in light of U.S. national security and also various U.S.-led efforts to promote reform amongst African citizens themselves. U.S. assistance finds its way to Africa through a variety of channels, including the USAID-administered DA program, food aid programs, and indirect aid provided through international financial institutions and the United Nations.
Date: June 9, 2005
Creator: Copson, Raymond W.
Item Type: Refine your search to only Report
open access

Air Force Military Construction (MILCON) Program, Military Family Housing

Description: This is to inform you all awards of MILCON, P7111 P713 MFH MILCON, O&M Sustainment, and O&M Restoration & Modernization projects in CONUS and US territories will immediately be placed on hold through 16 May 2005. This applies to all projects with bid openings and those pending contract award. For projects currently out for bids or ready for advertisement, recommend MAJCOMs proceed to open bids with bid acceptance periods of 120 days.
Date: June 9, 2005
Creator: United States. Department of Defense.
Item Type: Refine your search to only Text
open access

Airline Deregulation: Reregulating the Airline Industry Would Likely Reverse Consumer Benefits and Not Save Airline Pensions

Description: A letter report issued by the Government Accountability Office with an abstract that begins "The Airline Deregulation Act of 1978 phased out the government's control over fares and service and allowed market forces to determine the price and level of domestic airline service in the United States. The intent was to increase competition and thereby lead to lower fares and improved service. In 2005, GAO reported on the tenuous finances of some airlines that have led to bankruptcy and pension termi… more
Date: June 9, 2006
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Report
open access

The Alaska Natural Gas Pipeline: Background, Status, and Issues for Congress

Description: This report concerns itself with the construction of an Alaska natural gas pipeline. The report considers the funding available for a natural gas pipeline and the potential for it to stimulate the economy. Moreover, the report discusses how the 2008 recession poses an obstacle to the creation of the pipeline due to it causing low gas prices.
Date: June 9, 2011
Creator: Parfomak, Paul W.
Item Type: Refine your search to only Report
open access

Altitude performance investigation of single- and double-annular turbojet-engine combustors with various size fuel nozzles

Description: From Introduction: "The purpose of the investigation conducted at the NACA Lewis laboratory and reported herein was to determine the improvements possible in full-scale turbojet-engine performance when a single-annular combustor with slotted air-inlet orifices was used."
Date: June 9, 1952
Creator: Harp, James L., Jr. & Vincent, Kenneth R.
Item Type: Refine your search to only Report
open access

Ambient Laboratory Coater for Advanced Gas Reactor Fuel Development

Description: this research is targeted at developing improved experimentally-based scaling relationships for the hydrodynamics of shallow, gas-spouted beds of dense particles. The work is motivated by the need to more effctively scale up shallow spouted beds used in processes such as in the coating of nuclear fuel particles where precise control of solids and gas circulation is critically important. Experimental results reported here are for a 50 mm diameter spouted bed containing two different types of b… more
Date: June 9, 2010
Creator: Bruns, Duane D.; Counce, Robert M. & Rojas, Irma D. Lima
Item Type: Refine your search to only Report
open access

Amtrak: Management and Accountability Issues Contribute to Unprofitability of Food and Beverage Service

Description: Testimony issued by the Government Accountability Office with an abstract that begins "Amtrak has provided food and beverage service on its trains since it began operations in 1971. Amtrak has struggled since its inception to earn sufficient revenues and depends heavily on federal subsidies to remain solvent. While a small part of Amtrak's overall expenditures, Amtrak's food and beverage service illustrates concerns in Amtrak's overall cost containment, management and accountability issues. Thi… more
Date: June 9, 2005
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
open access

Analysis of Ranges During BRAC 2005

Description: In his 22 Oct 03, "Memorandum for Military Department Infrastructure Steering Group Members," Mr. Wynne; Acting Undersecretary of Defense for Acquisition, Technology and Logistics; requested each Military Department recommend "those classified ranges that should receive JCSG analysis."
Date: June 9, 2005
Creator: United States. Department of Defense.
Item Type: Refine your search to only Text
open access

Analysis of Recombination Processes in 0.5-0.6 eV Epitaxial GaInAsSb Lattice-matched to GaSb

Description: This work summarizes recent data on minority carrier lifetime in n- and p-type double heterostructures (DHs) of 0.5-0.6 eV GaInAsSb confined with GaSb and AlGaAsSb cap layers. Recombination times were measured by time-resolved photoluminescence (TRPL) and by optical frequency response (OFR) to sinusoidal excitation. It was shown that one of the mechanisms responsible for interface recombination in GaSb/GaInAsSb/GaSb DHs is thermionic emission of carriers over the heterobarrier. Considerable imp… more
Date: June 9, 2004
Creator: Donetsky, D.; Anikeev, S.; Gu, N.; Belenky, G.; Luryi, S.; Wang, C. A. et al.
Item Type: Refine your search to only Report
open access

Analytical and numerical evaluation of Landau cavities in the Fermilab Booster

Description: Longitudinal coupled bunch instability has been observed in the Fermilab Booster at high intensity. It is a cause for concern due to its effect on the Tevatron collider performance. We study this phenomenon using initial value technique to correctly account for the underlying transient nature. Analytic result is obtained for any mode and comparison is made between ordinary harmonic potential and higher harmonic (Landau) cavity potential. A computer program is developed to facilitate the calcula… more
Date: June 9, 1988
Creator: Chao, Yu-Chiu & Ng, King-Yuen
Item Type: Refine your search to only Article
open access

Annotation of the Clostridium Acetobutylicum Genome

Description: The genome sequence of the solvent producing bacterium Clostridium acetobutylicum ATCC824, has been determined by the shotgun approach. The genome consists of a 3.94 Mb chromosome and a 192 kb megaplasmid that contains the majority of genes responsible for solvent production. Comparison of C. acetobutylicum to Bacillus subtilis reveals significant local conservation of gene order, which has not been seen in comparisons of other genomes with similar, or, in some cases, closer, phylogenetic proxi… more
Date: June 9, 2004
Creator: Daly, M. J.
Item Type: Refine your search to only Report
open access

Antimony Based III-V Thermophotovoltaic Devices

Description: Antimony-based III-V thermophotovoltaic (TPV) cells are attractive converters for systems with low radiator temperature around 1100 to 1700 K, since these cells potentially can be spectrally matched to the thermal source. Cells under development include GaSb and the lattice-matched GaInAsSb/GaSb and InPAsSb/InAs quaternary systems. GaSb cell technology is the most mature, owing in part to the relative ease in preparation of the binary alloy compared to quaternary GaInAsSb and InPAsSb alloys. De… more
Date: June 9, 2004
Creator: Wang, C. A.
Item Type: Refine your search to only Report
open access

Application experiences with the Globus toolkit.

Description: The Globus grid toolkit is a collection of software components designed to support the development of applications for high-performance distributed computing environments, or ''computational grids'' [14]. The Globus toolkit is an implementation of a ''bag of services'' architecture, which provides application and tool developers not with a monolithic system but rather with a set of stand-alone services. Each Globus component provides a basic service, such as authentication, resource allocation,… more
Date: June 9, 1998
Creator: Brunett, S.
Item Type: Refine your search to only Article
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