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Water Pollution: Proposed Pretreatment Standards for Industrial Laundries

Description: Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the dispute between the Environmental Protection Agency (EPA) and the industrial laundry industry regarding EPA's cost benefit analyses of its proposed pretreatment standards, focusing on: (1) EPA's implementation of the Unfunded Mandates Reform Act of 1995 (UMRA); (2) the significant differences between EPA's and the industry's cost estimates of this proposed r… more
Date: January 20, 1999
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Year 2000 Computing Crisis: Readiness Improving, But Much Work Remains to Avoid Major Disruptions

Description: Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed: (1) the year 2000 risks facing the nation; (2) the federal government's progress and remaining challenges in correcting its systems; (3) state and local government year 2000 issues; and (4) the readiness of key public infrastructures and economic sectors."
Date: January 20, 1999
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Year 2000 Computing Challenge: Readiness Improving, But Critical Risks Remain

Description: Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the progress being made in addressing the year 2000 computing challenge and outlined the actions that need to be taken to ensure a smooth conversion to the next century."
Date: January 20, 1999
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Federal Aviation Administration: Issues Concerning the Reauthorization of Aviation Programs

Description: Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the issues being considered in the proposed legislation to reauthorize the Federal Aviation Administration's (FAA) aviation programs, focusing on: (1) air traffic control modernization program; (2) efforts to make its computer systems ready for the year 2000; (3) Airport Improvement Program (AIP) funding; (4) aviation safety and security measures; and … more
Date: January 20, 1999
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: Bush Today]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: January 20, 1999, 6:00 p.m.
Duration: 1 minute 24 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

[Comments on Whether EPA Interim Guidance Is a Rule Under the Congressional Review Act]

Description: Other written product issued by the General Accounting Office with an abstract that begins "GAO provided information on whether interim guidance for investigating Title VI administrative complaints challenging permits issued by the Environmental Protection Agency is a rule under the Congressional Review Act portion of the Small Business Regulatory Enforcement Act (SBREFA). GAO held that, irrespective of whether or not in isolation the second portion of the interim guidance is properly viewed as… more
Date: January 20, 1999
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Evaluating and managing Cold War era historic properties : the cultural significance of U.S. Air Force defensive radar systems.

Description: Aircraft and later missile radar early warning stations played an important role in the Cold War. They are associated with important technological, social, political, and military themes of the Cold War and are worthy of preservation. The scope and scale of these systems make physical preservation impractical, but the U.S. Air Force program of historical evaluation and documentation of these systems will provide valuable information to future generations studying this historic period.
Date: January 20, 1999
Creator: Whorton, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Influence of pulse width and target density on pulsed laser deposition of thin YBaCuO film.

Description: We have studied the effects of temporal pulse width and target density on the deposition of thin films of YBaCuO. A 248nm excimer laser and an 825nm Ti-sapphire laser were used to conduct the experiments with pulse widths of 27 ns, 16 ns, and 150 fs, and target densities of 80% and 90%. Scanning electron microscope photomicrographs and profilometer traces show a striking difference between nanosecond and femtosecond laser irradiation. Shortening the pulse width reduced particulate formation, pr… more
Date: January 20, 1999
Creator: Vikram, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rural Water Supply and Sewer Systems: Background Information

Description: The Safe Drinking Water Act and the Clean Water Act impose requirements regarding drinking water quality and wastewater treatment in rural areas. Approximately 27% of the U.S. population lives in areas defined by the Census Bureau as rural. Many rural communities need to complete water and waste disposal projects to improve the public health and environmental conditions of their citizens
Date: January 20, 1999
Creator: Copeland, Claudia
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Band Structure of InGaAsN Alloys and Effects of Presure

Description: InGaAsN is a new semiconductor alloy system with the remarkable property that the inclusion of only 2% nitrogen reduces the bandgap by more than 30%. In order to help understand the physical origin of this extreme deviation from the typically observed nearly linear dependence of alloy properties on concentration, we have investigated the pressure dependence of state energies using both experimental and theoretical methods. the excited We report measurements of the low temperature photoluminesce… more
Date: January 20, 1999
Creator: Allerman, A. A.; Jones, E. D.; Kurtz, S. R.; Modine, N. A.; Tozer, S. T.; Wei, X. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Semiconductor Microlaser for Intracavity Flow Cytometry

Description: Semiconductor microlasers are attractive components for micro-analysis systems because of their ability to emit coherent intense light from a small aperture. By using a surface-emitting semiconductor geometry, we were able to incorporate fluid flow inside a laser microcavity for the first time. This confers significant advantages for high throughput screening of cells, particulates and fluid analytes in a sensitive microdevice. In this paper we discuss the intracavity microfluidics and present … more
Date: January 20, 1999
Creator: Akhil, O.; Copeland, G. C.; Dunne, J. L.; Gourley, P. L.; Hendricks, J. K. & McDonald, A. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Wedge Prism for Direction Resolved Speckle Correlation Interferometry

Description: The role of a wedge prism for strain sign determination and enhancing the sensitivity for sub-fringe changes is emphasized. The design and incorporation aspects for in-plane sensitive interferometers have been described in detail. Some experimental results dealing with stress determination by laser annealing and speckle corelation interferometry are presented. The prism can also be applied to produce standardized carrier fringes in spatial phase shifting interferometry.
Date: January 20, 1999
Creator: Pechersky, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LEEM Investigation of the Faceting of the Pt Covered W (111) Surface

Description: A low energy electron microscope (LEEM) has been used to investigate the faceting of W(111) as induced by Pt. The atomically rough W(111) surface, when fully covered with a monolayer film of Pt and annealed to temperatures higher than {approximately} 750 K, experiences a significant morphological restructuring: the initially planar surface undergoes a faceting transition and forms three-sided pyramids with {211} faces. The experiments demonstrate the capability of LEEM for imaging both the full… more
Date: January 20, 1999
Creator: Hannon, J. B.; Kellogg, G. L.; Madey, T. E. & Pelhos, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Prediction and Uncertainty in Computational Modeling of Complex Phenomena: A Whitepaper

Description: This report summarizes some challenges associated with the use of computational science to predict the behavior of complex phenomena. As such, the document is a compendium of ideas that have been generated by various staff at Sandia. The report emphasizes key components of the use of computational to predict complex phenomena, including computational complexity and correctness of implementations, the nature of the comparison with data, the importance of uncertainty quantification in comprehendi… more
Date: January 20, 1999
Creator: Trucano, T. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Carrier Noise Reduction in Speckle Correlation Interferometry by a Unique Averaging Technique

Description: We present experimental result of carrier speckle noise averaging by a novel approach to generate numerous identical correlation fringes with randomly different speckles. The surface under study is sprayed with a new dry paint or a layer each time for the repetitive experiments to generate randomly different surfaces of the carrier speckle patterns.
Date: January 20, 1999
Creator: Pechersky, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Justification for Continued Operation of the SRS Saltstone Facility (Z-Area)

Description: Saltstone Production and Disposal Facilities (Z-Area) are a part of the Defense Waste Processing Facilities (DWPF). Z-Area facilities are just one segment of an integrated waste management and disposal system located at the Savannah River Site (SRS). The bases for the Justification of Continuing Operations (JCO) of the Saltstone Production and Disposal Facilities (Z-Area) at SRS are provided.
Date: January 20, 1999
Creator: Wagner, W.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Minimum Surface Formation Energy for Three-Dimensional Intergranular Fracture

Description: The minimum expended energy for fracture is the free energy required to form two new surfaces. For intergranular fracture, the minimum surface formation energy is complicated by the rough fracture surface, with area greater than the specimen cross-section. We utilize network optimization algorithms (max-flow/min-cut) to determine the minimum surface formation energies and surfaces for intergranular fracture in 3D polycrystals. For equiaxed grains and uniform boundary strength, the minimum energ… more
Date: January 20, 1999
Creator: Holm, E. A. & McGovney, G. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Magneto-Excitons in (411)A and (100)-Oriented GaAs/AlGaAs Multiple Quantum Well Structures

Description: We report magneto-exciton spectroscopy studies of (411)A and (100)-oriented GaAs/Al{sub 0.3}Ga{sub 0.7}As multiquantum well structures. The samples consisted of seven GaAs quantum wells with widths varying between 0.6 and 12nm, were grown on (411)A and (100)-oriented GaAs substrates. The exciton diamagnetic energy shifts and linewidths were measured between 0 and 14T at 1.4K The dependence of the exciton diamagnetic shifts with magnetic field were calculated using a variational approach and goo… more
Date: January 20, 1999
Creator: Bajaj, K. K.; Hiyamizu, S.; Jones, E. D.; Krivorotov, I.; Shimomura, S. & Shinohara, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Molecular Dynamics Simulations of Hexadecane/Silicalite Interfaces

Description: The interface between liquid hexadecane and the (010) surface of silicalite was studied by molecular dynamics. The structure of molecules in the interracial region is influenced by the presence of pore mouths on the silicalite surface. For this surface, whose pores are the entrances to straight channels, the concentration profile for partially absorbed molecules is peaked around 10 monomers inside the zeolite. No preference to enter or exit the zeolite based on absorption length is observed exc… more
Date: January 20, 1999
Creator: Grest, G. S. & Webb, E. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of Standards for Characterization of Cathodoluminescence Efficiency

Description: Cathodolurninescence (CL) characterization in a demountable vacuum chamber is an important benchmarking tool for flat-panel display phosphors and screens. The proper way to perform these measurements is to minimize the effects of secondary electrons, excite the phosphor/screen with a uniform beam profile, and maintain a clean vacuum environment. CL measurements are important for preliminary evaluation and lifetesting of phosphor powders and screens prior to incorporation into the FPD. A survey … more
Date: January 20, 1999
Creator: Shea, L.E. & Walko, R.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Clamping of the Linewidth Enhancement Factor in Narrow Quantum-Well GRINSCH Semiconductor Lasers

Description: The linewidth enhancement factor in single quantum-well GRINSCH semiconductor lasers is investigated theoretically and experimentally. For thin wells a small linewidth enhancement factor is obtained which clamps with increasing carrier density, in contrast to the monotonous increase observed for thicker wells. Microscopic many-body calculations reproduce the experimental observations attributing the clamping to a subtle interplay between excitation dependent gain shifts and carrier population d… more
Date: January 20, 1999
Creator: Bossert, D.; Chow, W.W.; Hader, J.; Koch, S.W.; Moloney, J.V. & Stohls, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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