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Joint Strike Fighter Acquisition: Development Schedule Should Be Changed to Reduce Risks

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Department of Defense's (DOD) Joint Strike Fighter (JSF) Program, focusing on: (1) the program's acquisition strategy; and (2) whether the strategy is being implemented in a manner that will ensure that the acquisition strategy objectives will be achieved."
Date: May 9, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Social Security: Use of the Social Security Number is Widespread

Description: Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the usage of the social security number (SSN), focusing on: (1) federal laws and regulations directing the number's use; (2) the non-federal purposes for which the number is used; and (3) what businesses and state governments believe the impact would be if federal laws limiting the use of SSNs were passed."
Date: May 9, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Department of Defense: Progress in Financial Management Reform

Description: Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed the Department of Defense's (DOD) financial management reform, focusing on the challenges and initiatives that are in place or planned."
Date: May 9, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

On-Line Trading: Better Investor Protection Information Needed on Brokers' Web Sites

Description: A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on on-line trading, focusing on: (1) the growth in on-line trading; (2) the extent to which on-line broker-dealers had experienced trading system delays and outages, including the causes of these problems and their reported effect on investors; and (3) how on-line broker-dealers address investor protection issues related to margin, privacy of inform… more
Date: May 9, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Debt Collection: Barring Delinquent Taxpayers From Receiving Federal Contracts and Loan Assistance

Description: Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed issues related to H.R. 4181, which would bar delinquent taxpayers from receiving federal contracts and loan assistance."
Date: May 9, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Overseas Investment: The Overseas Private Investment Corporation's Investment Funds Program

Description: A briefing report issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO reviewed the Overseas Private Investment Corporation's (OPIC) progress in improving the management of its investment funds program, focusing on: (1) how OPIC identifies and approves investment fund concepts and selects fund managers; (2) the funds' performance to date; and (3) the risk levels assigned to the funds."
Date: May 9, 2000
Creator: United States. General Accounting Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Extreme Ultraviolet Lithography - Reflective Mask Technology

Description: EUVL mask blanks consist of a distributed Bragg reflector made of 6.7nm-pitch bi-layers of MO and Si deposited upon a precision Si or glass substrate. The layer deposition process has been optimized for low defects, by application of a vendor-supplied but highly modified ion-beam sputter deposition system. This system is fully automated using SMIF technology to obtain the lowest possible environmental- and handling-added defect levels. Originally designed to coat 150mm substrates, it was upgrad… more
Date: May 9, 2000
Creator: Walton, C. C.; Kearney, P. A.; Mirkarimi, P. B.; Bowers, J. M.; Cerjan, C.; Warrick, A. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Spent Nuclear Fuel (SNF) Process Validation Technical Support Plan

Description: The purpose of Process Validation is to confirm that nominal process operations are consistent with the expected process envelope. The Process Validation activities described in this document are not part of the safety basis, but are expected to demonstrate that the process operates well within the safety basis. Some adjustments to the process may be made as a result of information gathered in Process Validation.
Date: May 9, 2000
Creator: SEXTON, R.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computational fluid dynamics simulations of a glass melting furnace

Description: The glass production industry is one of the major users of natural gas in the US, and approximately 75% of the energy produced from natural gas is used in the melting process. Industrial scale glass melting furnaces are large devices, typically 5 or more meters wide, and twice as long. To achieve efficient heat transfer to the glass melt below, the natural gas flame must extend over a large portion of the glass melt. Therefore modern high efficiency burners are not used in these furnaces. The n… more
Date: May 9, 2000
Creator: Egelja, A. & Lottes, S. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Calculation of Hamaker constants in non-aqueous fluid media

Description: Calculations of the Hamaker constants representing the van der Waals interactions between conductor, resistor and dielectric materials are performed using Lifshitz theory. The calculation of the parameters for the Ninham-Parsegian relationship for several non-aqueous liquids has been derived based on literature dielectric data. Discussion of the role of van der Waals forces in the dispersion of particles is given for understanding paste formulation. Experimental measurements of viscosity are pr… more
Date: May 9, 2000
Creator: BELL,NELSON S. & DIMOS,DUANE B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Further tests on liquid-nitrogen-cooled, thin silicon-crystal monochromators using a focused wiggler synchrotron beam

Description: A newly designed cryogenically cooled, thin Si crystal monochromator was tested at the European Synchrotrons Radiation Facility (ESRF) beamline BL3. It exhibited less than 1 arcsec of thermal strain up to a maximum incident power of 186 W and average power density of 521 W/mm{sup 2}. Data were collected for the thin (0.7 mm) portion of the crystal and for the thick (>25 mm) part. Rocking curves were measured as a function of incident power. With a low power beam, the Si(333) rocking curve at… more
Date: May 9, 2000
Creator: Rogers, C. S.; Mills, D. M.; Fernandez, P. B.; Knapp, G. S.; Wulff, M.; Hanfland, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The effect of the number of wavebands used in spectral radiation heat transfer calculations

Description: A spectral radiation heat transfer model that conserves emitted and absorbed energy has been developed and used to model the combustion space of an industrial glass furnace. This comprehensive radiation heat transfer model coupled with a computational fluid dynamics (CFD) code was used to investigate the effect of spectral dependencies on the computed results. The results of this work clearly indicate the need for a spectral approach as opposed to a gray body approach since the gray body approa… more
Date: May 9, 2000
Creator: Chang, S. L.; Golchert, B. & Petrick, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using desktop graphics workstations for interactive remote exploration of large data sets

Description: The interactive visualization and exploration of large scientific data sets is a challenging and difficult task; their size often far exceeds the performance and memory capacity of even the most powerful graphics workstations. To address this problem, we have created a technique that combines multiresolution data reduction methods with parallel computing to allow interactive exploration of large data sets while retaining full-resolution capability. We describe the creation of reduced data sets … more
Date: May 9, 2000
Creator: Freitag, L. A. & Loy, R. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ni-Al composite coatings: Diffusion analysis and coating lifetime estimation

Description: The interdiffusion of Ni matrix/Al particle composite coatings and nickel substrates was studied using electron probe microanalysis (EPMA) and a one-dimensional diffusion model. The initial coating microstructure was a two-phase mixture of y(Ni) and y{prime}(Ni{sub 3}Al). The coating/substrate assemblies were aged at 800 to 1,100 C for times up to 2,000 hours. It was found that aluminum losses to the substrate are significant at 1,000 C and above. The experimental results for the diffusion of A… more
Date: May 9, 2000
Creator: Susan, Donald F. & Marder, A. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Comparison of mechanical properties of glass-bonded sodalite and borosilicate glass high-level waste forms

Description: Argonne National Laboratory has developed a glass-bonded sodalite waste form to immobilize the salt waste stream from electrometallurgical treatment of spent nuclear fuel. The waste form consists of 75 vol.% crystalline sodalite and 25 vol.% glass. Microindentation fracture toughness measurements were performed on this material and borosilicate glass from the Defense Waste Processing Facility using a Vickers indenter. Palmqvist cracking was confined for the glass-bonded sodalite waste form, whi… more
Date: May 9, 2000
Creator: O'Holleran, T. P.; DiSanto, T.; Johnson, S. G. & Goff, K. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Thermodynamics of paracrystalline silicon

Description: Fluctuation microscopy experiments have shown that the as-deposited structure of amorphous silicon thin films is paracrystalline. A paracrystal consists of small (< 3 nm in diameter) topologically crystalline grains separated by a disordered matrix. Here the authors consider the thermodynamics of paracrystalline silicon as a function of the grain size and the temperature. They offer a simple model that qualitatively explains the observed metastability of the ordered structure at low temperat… more
Date: May 9, 2000
Creator: Voyles, P. M.; Treacy, M. M. J. & Gibson, J. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Porosity in polysilsesquioxane xerogels

Description: Polysilsesquioxanes, [RSiO{sub 1.5}]{sub n} are a class of hybrid organic-inorganic materials in which silicon atoms are linked with up to three siloxane bonds to other monomer units in the polymer and the organic group is a pendent functionality. Polysilsesquioxanes are prepared by the hydrolysis and condensation of organotrialkoxysilanes (Scheme l). Organotrialkoxysilanes RSi(OR{prime}){sub 3}, have been extensively used as coupling agents for composites or surface treatments for materials. P… more
Date: May 9, 2000
Creator: Loy, Douglas A.; Schneider, Duane A.; Baugher, Brigitta M. & Rahimian, Kamyar
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A validation process for multi-phase reacting flow CFD code

Description: Computational fluid dynamic (CFD) code calculates flow properties for the analysis of a flow system. Flow properties are computed based on conservation principles and various phenomenological models. The accuracy of the computed flow properties highly depends on the validity of the models and the degree of numerical convergence. Validation of a CFD code is essential for application of an engineering system. Multiphase reacting flows are common in industrial applications and few CFD code are ava… more
Date: May 9, 2000
Creator: Chang, S. L.; Zhou, C. Q. & Petrick, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A numerical investigation of gasoline production from multi-stage FCC systems

Description: Staged, fluid catalytic cracking (FCC) processes are deemed to have the potential to enhance FCC performance in the areas of product selectivity, operating flexibility, throughput, reliability, operating costs, and emissions. Computational fluid dynamic (CFD) codes are used to analyze various staged FCC concepts to help accelerate their development into commercial products. Three conceptual multi-stage FCC systems were evaluated using a validated CFD code. The results indicated potential increa… more
Date: May 9, 2000
Creator: Chang, S. L.; Zhou, C. Q. & Petrick, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Molecular engineering with bridged polysilsesquioxanes

Description: Bridged polysilsesquioxanes are a class of hybrid organic-inorganic materials that permit molecular engineering of bulk properties including porosity. Prepared by sol-gel polymerization of monomers with two or more trialkoxysilyl groups, the materials are highly cross-linked amorphous polymers that are readily obtained as gels. The bridging configuration of the hydrocarbon group insures that network polymers are readily formed and that the organic functionality is homogeneously distributed thro… more
Date: May 9, 2000
Creator: LOY,DOUGLAS A. & SHEA,KENNETH J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Phase structure within a fracture network beneath a surface pond: Field experiment

Description: The authors performed a simple experiment to elucidate phase structure within a pervasively fractured welded tuff. Dyed water was infiltrated from a surface pond over a 36 minute period while a geophysical array monitored the wetted region within vertical planes directly beneath. They then excavated the rock mass to a depth of {approximately}5 m and mapped the fracture network and extent of dye staining in a series of horizontal pavements. Near the pond the network was fully stained. Below, the… more
Date: May 9, 2000
Creator: Glass Jr., Robert J. & Nicholl, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Bridged polysilsesquioxanes: A molecular based approach for the synthesis of functional hybrid materials

Description: Bridged polysilsesquioxanes (BPS) are a family of hybrid organic-inorganic materials prepared by sol-gel polymerization of molecular building blocks that contain a variable organic component and at least two trifunctional silyl groups. The resulting xerogels and aerogels have physical and mechanical properties that are strongly influenced by the organic bridging group. This talk focuses on the synthesis of functional bridged polysilsesquioxanes. Incorporation of functional groups that respond t… more
Date: May 9, 2000
Creator: SHEA,KENNETH J. & LOY,DOUGLAS A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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