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Science and Technology Review June 2004

Description: This months issue has the following articles: (1) ''A New Era in Plutonium Research''--Commentary by William H. Goldstein. (2) ''Shocking Plutonium to Reveal Its Secrets''--Livermore scientists are using a new gas gun located at the Nevada Test Site for shocking plutonium to extreme pressures and temperatures. (3) ''Strategic Supercomputing Comes of Age''--As supercomputing settles into the terascale regime, simulations reveal pertinent insights about the physics of stockpile stewardship. (4) '… more
Date: April 29, 2004
Creator: Henson, V E
Partner: UNT Libraries Government Documents Department
open access

Gas Turbine Reheat Using In-Situ Combustion

Description: Siemens Westinghouse Power Corporation (SWPC) is developing in-situ reheat (fuel injection via airfoil injection) as a means for increasing cycle efficiency and power output, with possibly reduced emissions. This report discusses engineering cycle evaluations on various reheat approaches, using GateCycle and ChemCad software simulations of typical F-class and G-class engines, modified for alternative reheat cycles. The conclusion that vane 1 reheat offers the most advantageous design agrees wit… more
Date: April 29, 2004
Creator: Newby, R. A.; Bachovchin, D. M. & Lippert, T. E.
Partner: UNT Libraries Government Documents Department
open access

An Assessment of Future Demands for and Benefits of Public Transit Srevices in Tennessee

Description: This report documents results from a study carried out by Oak Ridge National Laboratory and the University of Tennessee at Knoxville for the Office of Public Transportation, Tennessee Department of Transportation. The study team was tasked with developing a process and a supporting methodology for estimating the benefits accruing to the State from the operation of state supported public transit services. The team was also tasked with developing forecasts of the future demands for these State su… more
Date: April 29, 2004
Creator: Southworth, F.
Partner: UNT Libraries Government Documents Department
open access

Economic Development Options and Constraints in Remote Rural Counties: A Case Study of the Great Plains Region

Description: This report discusses socioeconomic characteristics and trends of 242 remote rural counties in seven states of the Great Plains region stretching from Texas to the Dakotas. Appendices provide individual county level data on socioeconomic trends in population, education, employment, and income for the 242 remote counties.
Date: April 29, 2004
Creator: Cowan, Tadlock
Partner: UNT Libraries Government Documents Department
open access

An Advanced Fracture Characterization and Well Path Navigation System for Effective Re-Development and Enhancement of Ultimate Recovery From the Complex Monterey Reservoir of South Ellwood Field, Offshore California, Quarterly Report: January - March 2004

Description: Venoco Inc, intends to re-develop the Monterey Formation, a Class III basin reservoir, at South Ellwood Field, Offshore Santa Barbara, California. Well productivity in this field varies significantly. Cumulative Monterey production for individual wells has ranged from 260 STB to 8,700,000 STB. Productivity is primarily affected by how well the well path connects with the local fracture system and the degree of aquifer support. Cumulative oil recovery to date is a small percentage of the origina… more
Date: April 29, 2004
Creator: Horner, Steve
Partner: UNT Libraries Government Documents Department
open access

Effect of Growth Interruption on Surface Recombination Velocity in GaInAsSb/AlGaAsSb Heterostructures Grown by Organometallic Vapor Phase Epitaxy

Description: The effects of growth interruption on the quality of GaInAsSb/AlGaAsSb heterostructures grown by organometallic vapor phase epitaxy are reported. In-situ reflectance monitoring and ex-situ characterization by high-resolution x-ray diffraction, 4K photoluminescence (PL), and time-resolved PL indicate that GaInAsSb is extremely sensitive to growth interruption time as well as the ambient atmosphere during interruption. By optimizing the interruption sequence, surface recombination velocity as low… more
Date: April 29, 2004
Creator: Wang, C. A.; Shiau, D. A.; Donetsky, D.; Anikeev, S.; Belenky, G. & Luryi, S.
Partner: UNT Libraries Government Documents Department
open access

Grain Refinement of Permanent Mold Cast Copper Base Alloys

Description: Grain refinement behavior of copper alloys cast in permanent molds was investigated. This is one of the least studied subjects in copper alloy castings. Grain refinement is not widely practiced for leaded copper alloys cast in sand molds. Aluminum bronzes and high strength yellow brasses, cast in sand and permanent molds, were usually fine grained due to the presence of more than 2% iron. Grain refinement of the most common permanent mold casting alloys, leaded yellow brass and its lead-free re… more
Date: April 29, 2004
Creator: Sadayappan, M.; Thomson, J. P.; Elboujdaini, M.; Ping Gu, G. & Sahoo, M.
Partner: UNT Libraries Government Documents Department
open access

Heat Treatment Procedure Qualification for Steel Castings

Description: Heat treatment practices used by steel foundries have been carefully studied as part of comprehensive heat treatment procedure qualification development trials. These studies highlight the relationships between critical heat treatment process control parameters and heat treatment success. Foundry heat treatment trials to develop heat treatment procedure qualifications have shed light on the relationship between heat treatment theory and current practices. Furnace load time-temperature profiles … more
Date: April 29, 2004
Creator: Charles, Mariol; Deskevich, Nicholas; Varkey, Vipin; Voigt, Robert & Wollenburg, Angela
Partner: UNT Libraries Government Documents Department
open access

Experimental and Theoretical Studies of Nucleation in Supercooled Liquid Silicon. Final Program Report

Description: The original objectives of the present program consisted of two specific nucleation-related research activities; (1) to provide a set of experimental data that will enable the quantitative examination of classical nucleation theory, and (2) to describe the phenomenon of nucleation by developing general expressions of nucleation that include both the thermal and athermal components and that correctly consider and incorporate the transient effects that arise from the nonstationary cluster distrib… more
Date: April 29, 2004
Creator: Im, J.
Partner: UNT Libraries Government Documents Department
open access

Improved Scheme for Modeling Mass Transfer between Fracture and Matrix Continua with Particle Tracking Method

Description: The dual-continuum random-walk particle tracking approach is an attractive simulation method for simulating transport in a fractured porous medium. In order to be truly successful for such a model, however, the key issue is to properly simulate the mass transfer between the fracture and matrix continua. In a recent paper, Pan and Bodvarsson (2002) proposed an improved scheme for simulating fracture-matrix mass transfer, by introducing the concept of activity range into the calculation of fractu… more
Date: April 29, 2004
Creator: Pan, L.; Seol, Y. & Bodvarsson, G.
Partner: UNT Libraries Government Documents Department
open access

Optical Coatings for Thermophotovoltaic Spectral Control

Description: The efficiency of thermophotovoltaic (TPV) energy conversion is dependent on efficient spectral control. An edge pass filter (short pass) in series with a highly doped, epitaxially grown layer has achieved the highest performance of TPV spectral control. Front surface, tandem filters have achieved the highest spectral efficiency and represent the best prospect for even higher spectral efficiency for TPV energy conversion systems. Specifically, improvements in the physical vapor deposition proce… more
Date: April 29, 2004
Creator: Fourspring, P. M.; DePoy, D. M.; Rahmlow, T. D., Jr.; Lazo-Wasem, J. E. & Gratrix, E. J.
Partner: UNT Libraries Government Documents Department
open access

Advanced Lost Foam Casting Technology - Phase V

Description: Previous research, conducted under DOE Contracts DE-FC07-89ID12869, DE-FC07-93ID12230 and DE-FC07-95ID113358 made significant advances in understanding the Lost Foam Casting (LFC) Process and clearly identified areas where additional developments were needed to improve the process and make it more functional in industrial environments. The current project focused on eight tasks listed as follows: Task 1--Computational Model for the Process and Data Base to Support the Model; Task 2--Casting Dim… more
Date: April 29, 2004
Creator: Sun, Wanliang; Littleton, Harry E. & Bates, Charles E.
Partner: UNT Libraries Government Documents Department
open access

Older Americans Act Nutrition Program

Description: This report discusses the elderly nutrition program of the Older Americans Act which provides grants to state agencies on aging to support congregate and home-delivered meals to persons 60 years and older. Funding and statistics of assistance are also addressed.
Date: April 29, 2004
Creator: O'Shaughnessy, Carol
Partner: UNT Libraries Government Documents Department
open access

The Coalition Provisional Authority (CPA): Origin, Characteristics, and Institutional Authorities

Description: The Coalition Provisional Authority (CPA or “the authority”) was established approximately one month after United States and coalition forces took control of Baghdad in Iraq on April 9, 2003.1 The authority’s mission was “to restore conditions of security and stability, to create conditions in which the Iraqi people can freely determine their own political future, (including by advancing efforts to restore and establish national and local institutions for representative governance) and facilita… more
Date: April 29, 2004
Creator: Halchin, L. Elaine
Partner: UNT Libraries Government Documents Department
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