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UNT Libraries Government Documents Department
176
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48
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29
National Museum of the Pacific War/Admiral Nimitz Foundation
18
Dallas Area Rapid Transit (DART)
12
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12
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22
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Year
Month
Day
Language
Heavy Neutral Beam Probe for Edge Plasma Analysis in Tokamaks
The Heavy Neutral Beam Probe (HNBP) developed initially with DOE funding under the Small Business Innovation Research (SBIR) program was installed on the Tokamak de Varennes (TdeV) at the CCFM. This diagnostic was designed to perform fundamental measurements of edge plasma properties. The hardware was capable of measuring electron density and potential profiles with high spatial and temporal resolution. Fluctuation spectra for these parameters were obtained with HNBP for transport studies.
Date:
January 4, 2001
Creator:
Castracane, J.
Object Type:
Report
System:
The UNT Digital Library
Environmentally-Induced Malignancies: An In Vivo Model to Evaluate the Health Impact of Chemicals in Mixed Waste
Occupational and environmental exposure to organic ligands, solvents, fuel hydrocarbons, and polychlorinated biphenyls are linked with increased risk of hematologic malignancies. DOE facilities and waste sites in the U.S. are contaminated with mixtures of potentially hazardous chemicals such as metals, organic ligands, solvents, fuel hydrocarbons, polychlorinated biphenyls and radioactive isotopes. A major goal of this project was to establish linkage between chemical/radiation exposure and induction of genomic damage in target populations with the capability to undergo transformation.
Date:
May 4, 2001
Creator:
Pallavicini, Maria
Object Type:
Report
System:
The UNT Digital Library
Slicing of silicon ingots with reduced kerf. Final report (Phase II)
The Fixed Abrasive Slicing Technique (FAST) has been developed as an effective wafering technique by combining the advantages of diamond as an abrasive like internal diamond (ID), a reciprocating bladehead as in Multi-Blade Slurry (MBS) and wire slicing as in multiwire slicing (MWS) techniques. During the development stage, it was necessary to develop a slicer, bladepacks and the technique. It was recognized that high pressures were required between the diamond abrasive and the crystal to achieve effective slicing. This was achieved by rocking the workpiece to minimize the contact length. During the present work, the cutting effectiveness was enhanced by increasing the rotary speed of the crystal in the range of 2,500 to 5,000 rpm and the reciprocating rate of the bladehead to about 100 cycles/minute. The combination of high speed rotation of the crystal and FAST slicing have produced more effective slicing by increasing the cutting rate by a factor of 50 to produce multiple wafers wit h low kerf, low surface damage and high accuracy. In addition, this technique is now applicable for soft as well as very hard crystals. Based on these developments, Crystal Systems is currently commercializing FAST for slicing of a wide variety of hard …
Date:
January 4, 2001
Creator:
Schmid, F.; Smith, M.; Schmid, K. & Khattak, C.P.
Object Type:
Report
System:
The UNT Digital Library
Transmutation of light water reactor-discharge-transuranics in high temperature gas cooled reactor.
None
Date:
September 4, 2001
Creator:
Gohar, Y.; Taiwo, T.A. & Finck, P.
Object Type:
Article
System:
The UNT Digital Library
Synthesis, properties and applications of pure and covalently doped DLC films prepared by energetic condensation
Hyper-thermal species have been used to produce carbon-based films with mechanical and tribological properties that have greatly expanded the applications of amorphous carbon coatings. Tetragonally bonded amorphous carbon films have properties that approach that of diamond in several ways. The major drawback, namely intrinsic stresses, preventing the production of thick ta-C films has been overcome by heat treating these films, and presently several micrometer-thick films of ta-C are regularly produced. Yet another area where superhard coatings are of great interest is for wear applications at elevated temperatures, namely around 500 degrees C and above. Such temperatures may be environment temperatures, or localized (flash) temperatures resulting for instance from wear. For this applications, doping the ta-C with elements that are covalently bonded to C (such as Si and B) offers a promising alternative. In this article, I will discuss some treatments that have allowed expanding the applications of pure ta-C, and the incorporation of Si and B on ta-C films. Film properties are presented and discussed.
Date:
December 4, 2001
Creator:
Monteiro, Othon R.
Object Type:
Article
System:
The UNT Digital Library
DOE SBIR Phase I Grant No. DE-FG02-00ER83067, ''A Flexible and Economical Automated Nucleophilic [{sup 18}F]Fluorination synthesis System for PET Radiopharmaceuticals.'' Final Technical Report
Phase I Final Report. A prototype manual remote synthesis system based on the unit operations approach was designed, constructed, and functionally tested. This general-purpose system was validated by its configuration and initial use for the preparation of the PET radiopharmaceutical [F-18]FLT using [F-18]fluoride ion.
Date:
August 4, 2001
Creator:
Padgett, Henry C.
Object Type:
Report
System:
The UNT Digital Library
Development of a Robust Model-Based Water Level Controller for U-Tube Steam Generator
Poor control of steam generator water level of a nuclear power plant may lead to frequent nuclear reactor shutdowns. These shutdowns are more common at low power where the plant exhibits strong non-minimum phase characteristics and flow measurements at low power are unreliable in many instances. There is need to investigate this problem and systematically design a controller for water level regulation. This work is concerned with the study and the design of a suitable controller for a U-Tube Steam Generator (UTSG) of a Pressurized Water Reactor (PWR) which has time varying dynamics. The controller should be suitable for the water level control of UTSG without manual operation from start-up to full load transient condition. Some preliminary simulation results are presented that demonstrate the effectiveness of the proposed controller. The development of the complete control algorithm includes components such as robust output tracking, and adaptively estimating both the system parameters and state variables simultaneously. At the present time all these components are not completed due to time constraints. A robust tracking component of the controller for water level control is developed and its effectiveness on the parameter variations is demonstrated in this study. The results appear encouraging and they are …
Date:
September 4, 2001
Creator:
Basher, A. M. H.
Object Type:
Report
System:
The UNT Digital Library
A high performance software component architectures for SciTL. Final report
This is the final report for the project. The report describes the project results and conclusions. It also lists all technical documents and software artifacts.
Date:
February 4, 2001
Creator:
Gannon, Dennis
Object Type:
Report
System:
The UNT Digital Library
Status and Future Directions of the ENERGY STAR Program
In 1992 the U.S. Environmental Protection Agency (EPA) introduced ENERGY STAR (registered trademark) a voluntary labeling program designed to identify and promote energy-efficient products, in order to reduce carbon dioxide emissions. Since then, the EPA, now in partnership with the U.S. Department of Energy (DOE), has expanded the program to cover nearly the entire buildings sector, spanning new homes, commercial buildings, residential heating and cooling equipment, major appliances, office equipment, commercial and residential lighting, and home electronics. This paper is based on our experience since 1993 in providing technical support to the ENERGY STAR program. We provide a snapshot of the ENERGY STAR program in the year 2000, including a general overview of the program, its accomplishments, and the possibilities for future development.
Date:
December 4, 2001
Creator:
Brown, Richard; Webber, Carrie & Koomey, Jonathan
Object Type:
Article
System:
The UNT Digital Library
Partial support for the International Global Atmospheric Chemistry Core Project Office
IGAC provides an international framework for the planning, coordination, and execution of atmospheric--biospheric research with emphasis on projects which require resources beyond the capabilities of any single nation. The development of chemical emission inventories by IGAC scientists, the development and intercomparison under IGAC leadership of existing chemical transport models, the analysis of data gathered during IGAC-sponsored field campaigns, etc., has provided new scientific information essential to the development of the discipline.
Date:
May 4, 2001
Creator:
Prinn, Ronald G.
Object Type:
Report
System:
The UNT Digital Library
2001 Gordon Research Conference on MYOGENESIS
The attendees represented the spectrum of endeavor in this field coming from academia, industry, and government laboratories, both U.S. and foreign scientists, senior researchers, young investigators, and students. Emphasis was placed on current unpublished research and discussion of the future target areas in this field.
Date:
May 4, 2001
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Exploring new physics through contact interactions in lepton pair production at a linear collider
If a contact interaction type correction to a Standard Model process is observed, studying its detailed properties can provide information on the fundamental physics responsible for it. Assuming that such a correction has been observed in lepton pair production at a 500 GeV-1 TeV linear collider, we consider a few possible models that could explain it, such as theories with large and TeV-scale extra dimensions and models with lepton compositeness. We show that using the measured cross-sections and angular distributions, these models can be distinguished with a high degree of confidence.
Date:
December 4, 2001
Creator:
Perelstein, Maxim & Pasztor, Gabriella
Object Type:
Article
System:
The UNT Digital Library
Integrated fuel processor development.
The Department of Energy's Office of Advanced Automotive Technologies has been supporting the development of fuel-flexible fuel processors at Argonne National Laboratory. These fuel processors will enable fuel cell vehicles to operate on fuels available through the existing infrastructure. The constraints of on-board space and weight require that these fuel processors be designed to be compact and lightweight, while meeting the performance targets for efficiency and gas quality needed for the fuel cell. This paper discusses the performance of a prototype fuel processor that has been designed and fabricated to operate with liquid fuels, such as gasoline, ethanol, methanol, etc. Rated for a capacity of 10 kWe (one-fifth of that needed for a car), the prototype fuel processor integrates the unit operations (vaporization, heat exchange, etc.) and processes (reforming, water-gas shift, preferential oxidation reactions, etc.) necessary to produce the hydrogen-rich gas (reformate) that will fuel the polymer electrolyte fuel cell stacks. The fuel processor work is being complemented by analytical and fundamental research. With the ultimate objective of meeting on-board fuel processor goals, these studies include: modeling fuel cell systems to identify design and operating features; evaluating alternative fuel processing options; and developing appropriate catalysts and materials. Issues and outstanding …
Date:
December 4, 2001
Creator:
Ahmed, S.; Pereira, C.; Lee, S. H. D. & Krumpelt, M.
Object Type:
Article
System:
The UNT Digital Library
Highly Efficient Tabletop Optical Parametric Chirped Pulse Amplifier at 1 (micron)m
Optical parametric chirped pulse amplification (OPCPA) is a scalable technology, for ultrashort pulse amplification. Its major advantages include design simplicity, broad bandwidth, tunability, low B-integral, high contrast, and high beam quality. OPCPA is suitable both for scaling to high peak power as well as high average power. We describe the amplification of stretched 100 fs oscillator pulses in a three-stage OPCPA system pumped by a commercial, single-longitudinal-mode, Q-switched Nd:YAG laser. The stretched pulses were centered around 1054 nm with a FWHM bandwidth of 16.5 nm and had an energy of 0.5 nJ. Using our OPCPA system, we obtained an amplified pulse energy of up to 31 mJ at a 10 Hz repetition rate. The overall conversion efficiency from pump to signal is 6%, which is the highest efficiency obtained With a commercial tabletop pump laser to date. The overall conversion efficiency is limited due to the finite temporal overlap of the seed (3 ns) with respect to the duration of the pump (8.5 ns). Within the temporal window of the seed pulse the pump to signal conversion efficiency exceeds 20%. Recompression of the amplified signal was demonstrated to 310 fs, limited by the aberrations initially present in the low energy …
Date:
December 4, 2001
Creator:
Jovanovic, I.; Ebbers, C. A.; Comaskey, B. J.; Bonner, R. A. & Morse, E. C.
Object Type:
Article
System:
The UNT Digital Library
In-Process Detection of Weld Defects Using Laser-Based Ultrasonic Lamb Waves
Laser-based ultrasonic (LBU) measurement shows great promise for on-line monitoring of weld quality in tailor-welded blanks. Tailor-welded blanks are steel blanks made from plates of differing thickness and/or properties butt-welded together; they are used in automobile manufacturing to produce body, frame, and closure panels. LBU uses a pulsed laser to generate the ultrasound and a continuous wave (CW) laser interferometer to detect the ultrasound at the point of interrogation to perform ultrasonic inspection. LBU enables in-process measurements since there is no sensor contact or near-contact with the workpiece. The authors have used laser-generated plate (Lamb) waves to propagate from one plate into the weld nugget as a means of detecting defects. This report recounts an investigation of a number of inspection architectures based on processing of signals from selected plate waves, which are either reflected from or transmitted through the weld zone. Bayesian parameter estimation and wavelet analysis (both continuous and discrete) have shown that the LBU time-series signal is readily separable into components that provide distinguishing features, which describe weld quality. The authors anticipate that, in an on-line industrial application, these measurements can be implemented just downstream from the weld cell. Then the weld quality data can be fed …
Date:
January 4, 2001
Creator:
Kercel, S. W.
Object Type:
Report
System:
The UNT Digital Library
Lead-bismuth-eutectic spallation neutron source for nuclear transmuter.
None
Date:
September 4, 2001
Creator:
Gohar, Y.; Herceg, J.; Krajtl, L.; Pionter, D.; Saiveau, J.; Sofu, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Hiroshima Air-Over-Ground Analysis: Comparison of DORT and MCNP Calculations
Monte Carlo (MCNP4B) and Discrete Ordinates (DORT) calculations were carried out to estimate {sup 60}Co and {sup 152}Eu activation as a function of ground range due to neutrons emitted from the Hiroshima A-bomb. Results of ORNL DORT and MCNP calculations using RZ cylindrical air-over-ground models are compared with LANL MCNP results obtained with an XYZ air-over-ground model. All of the calculations were carried out using ENDF/B-VI cross-section data and detailed angle and energy resolved neutron emission spectra from the weapon. Favorable agreement was achieved for the {sup 60}Co and {sup 152}Eu activation for ground ranges out to 1000m from the three calculations.
Date:
September 4, 2001
Creator:
Santoro, RT
Object Type:
Report
System:
The UNT Digital Library
Texas Register, Volume 26, Number 18, Pages 3301-3420, May 4, 2001
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
May 4, 2001
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Wetlands Protection: Assessments Needed to Determine Effectiveness of In-Lieu-Fee Mitigation
A letter report issued by the General Accounting Office with an abstract that begins "More than half the estimated 220 million acres of marshes, bogs, swamps, and other wetlands in the United States during the colonial times, have disappeared, and others have become degraded. This decline is due, primarily, to farming and development. Developers whose projects may harm wetlands must, according to environmental regulations, first avoid and then minimize adverse impacts to wetlands to the extent practicable. If harmful impacts are unavoidable, the developer must compensate by restoring a former wetland, enhancing a degraded wetland, creating a new wetland, or preserving an existing wetland. Such mitigation efforts can occur under the following three types of arrangements: (1) mitigation banks, under which for-profit companies restore wetlands under Army Corps of Engineers agreements and then sell credits for these wetlands to developers; (2) in-lieu-fee arrangements under which developers pay public or non-profit organizations fees for establishing wetland areas, usually under formal Corps agreements; and (3) ad hoc arrangements, under which developers pay individuals or companies to perform the mitigation. This report, determines the extent to which (1) the in-lieu-fee option has been used to mitigate adverse impacts to wetlands, (2) the in-lieu-fee …
Date:
May 4, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
2000 Census: Better Productivity Data Needed for Future Planning and Budgeting
A letter report issued by the General Accounting Office with an abstract that begins "Nonresponse follow-up was the most expensive and labor-intensive of all Census 2000 operations. The Census Bureau spent $1.2 billion and used more than 500,000 enumerators to obtain census information from 42 million nonresponding households in less than 10 weeks. Because of this colossal workload, even small variations in productivity had significant cost implications. Workload and enumerator productivity have historically been two of the largest drivers of census costs, and the Bureau developed its budget model for the 2000 Census using key assumptions about these two variables. Nationally, enumerators completed their nonresponse follow-up workload at a rate of 1.04 housing units per hour--slightly exceeding the Bureau's expected rate of 1.03 housing units per hour. Productivity varied for the four primary types of local census offices, ranging from 0.90 housing units per hour in inner-city and urban areas to 1.10 cases per hour in rural areas. In refining the data, the Bureau corrected what it considered to be the most significant discrepancy--a misclassification of some employees' time charges that overstated the number of hours worked by nonresponse follow-up enumerators and understated enumerator production rates."
Date:
October 4, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Workers' Compensation: Action Needed to Reduce Payment Errors in SSA Disability and Other Programs
A letter report issued by the General Accounting Office with an abstract that begins "This report discusses how workers' compensation (WC) benefits affect benefit programs run by the Social Security Administration (SSA) and other agencies. GAO (1) examines the effects of WC benefits on SSA programs, focusing on SSA's progress in administering the WC offset provision; (2) discusses other federal programs whose benefit payments are also affected by WC benefits; and (3) discusses ways to address federal benefit payment errors related to workers' compensation. GAO found that SSA's administration of the WC offset provision continues to be undermined by the lack of reliable information on WC benefits received by Social Security Disability Insurance (DI) beneficiaries which causes some beneficiaries to be overpaid and others to be underpaid. No national reporting system identifies WC beneficiaries. Instead, SSA largely relies on applicants and beneficiaries to report their receipt of WC benefits and any changes that occur in the benefit amounts--an approach that makes it very difficult for SSA to make accurate benefit payments. Other federal agencies also need WC information to make accurate benefit payments and face similar difficulties identifying WC beneficiaries. Like SSA, Medicare relies on its applicants and beneficiaries to …
Date:
May 4, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
GAO: Making a Difference for Congress and the Nation; Strategic Plan Framework
Other written product issued by the General Accounting Office with an abstract that begins "This is an insert to GAO's publication, Serving the Congress and the Nation, describing the goals, functions, and responsibilities of GAO's Strategic Plan framework."
Date:
September 4, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Walker Branch Throughfall Displacement Experiment Data Report: Site Characterization, System Performance, Weather, Species Composition, and Growth
This numeric data package provides data sets, and accompanying documentation, on site characterization, system performance, weather, species composition, and growth for the Throughfall Displacement Experiment, which was established in the Walker Branch Watershed of East Tennessee to provide data on the responses of forests to altered precipitation regimes. The specific data sets include soil water content and potential, coarse fraction of the soil profile, litter layer temperature, soil temperature, monthly weather, daily weather, hourly weather, species composition of trees and saplings, mature tree and sapling annual growth, and relative leaf area index. Fortran and SAS{trademark} access codes are provided to read the ASCII data files. The data files and this documentation are available without charge on a variety of media and via the Internet from the Carbon Dioxide Information Analysis Center (CDIAC).
Date:
September 4, 2001
Creator:
Hanson, Paul J.; Todd, Donald E.; Riggs, Jeffery S.; Wolfe, Mark E. & O'Neill, Elizabeth G.
Object Type:
Report
System:
The UNT Digital Library
Corrosion Behavior of 304 Stainless Steel in High Temperature, Hydrogenated Water
The corrosion behavior of an austenitic stainless steel (UNS S30400) has been characterized in a 10,000 hour test conducted in hydrogenated, ammoniated water at 260 C. The corrosion kinetics were observed to follow a parabolic rate dependency, the parabolic rate constant being determined by chemical descaling to be 1.16 mg dm{sup -2} hr{sup -1/2}. X-ray photoelectron spectroscopy, in combination with argon ion milling and target factor analysis, was applied to provide an independent estimate of the rate constant that agreed with the gravimetric result. Based on the distribution of the three oxidized alloying constituents (Fe, Cr, Ni) with respect to depth and elemental state, it was found that: (a) corrosion occurs in a non-selective manner, and (b) the corrosion film consists of two spinel oxide layers--a ferrite-based outer layer (Ni{sub 0.2}Fe{sub 0.8})(Fe{sub 0.95}Cr{sub 0.05}){sub 2}O{sub 4} on top of a chromite-based inner layer (Ni{sub 0.2}Fe{sub 0.8})(Cr{sub 0.7}Fe{sub 0.3}){sub 2}O{sub 4}. These compositions agree closely with the solvi phases created by immiscibility in the Fe{sub 3}O{sub 4}-FeCr{sub 2}O{sub 4} binary, implying that immiscibility plays an important role in the phase separation process.
Date:
May 4, 2001
Creator:
Ziemniak, S. E. & Hanson, M.
Object Type:
Report
System:
The UNT Digital Library