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Office of Scientific & Technical Information Technical Reports
2,333
Congressional Research Service Reports
1,521
Texas State Publications
545
Technical Report Archive and Image Library
429
Government Accountability Office Reports
225
National Advisory Committee for Aeronautics Collection
222
TRAIL Microcard Collection
155
Harris and Eliza Kempner
19
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9
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6
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Texas Motor Vehicle Traffic Accident Summaries
424
Summary of All Reported Accidents in the State of Texas
184
Summary of All Reported Accidents in Rural Areas of Texas
183
NACA Research Memorandums
181
Atomic Energy Commission Reports
90
CRS Issue Briefs
86
Hanford Works Reports
42
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37
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224 More
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An advanced control system for fine coal flotation
None
Date:
December 20, 1999
Creator:
Adel, G. T. & Luttrell, G. H.
System:
The UNT Digital Library
Development of a video-based slurry sensor for on-line ash analysis. Fourth quarter technical progress report, July 1--September 30, 1995
Automatic control of fine coal cleaning circuits has traditionally been limited by the lack of sensors for on-line ash analysis. Although several nuclear-based analyzers are available, none have seen widespread acceptance. This is largely due to the fact that nuclear sensors are expensive and tend to be influenced by changes in seam type and pyrite content. Recently, researchers at VPI and SU have developed an optical sensor for phosphate analysis. The sensor uses image processing technology to analyze video images of phosphate ore. It is currently being used by Texasgulf for off-line analysis of dry flotation concentrates. The primary advantages of optical sensors over nuclear sensors are that they are significantly cheaper, are not subject to measurement variations due to changes in high atomic number minerals, are inherently safer and require no special radiation permitting. The purpose of this work is to apply the knowledge gained in the development of an optical phosphate analyzer to the development of an on-line ash analyzer for fine coal slurries. During the past quarter, a study was conducted to determine if monochromatic illumination could be used as a means of enhancing the differences observed between coal and mineral matter under reflected light. After extensive …
Date:
October 20, 1995
Creator:
Adel, G. T. & Luttrell, G. H.
System:
The UNT Digital Library
Outlook and Challenges for Chinese Coal
China has been, is, and will continue to be a coal-powered economy. The rapid growth of coal demand since 2001 has created deepening strains and bottlenecks that raise questions about supply security. Although China's coal is 'plentiful,' published academic and policy analyses indicate that peak production will likely occur between 2016 and 2029. Given the current economic growth trajectory, domestic production constraints will lead to a coal gap that is not likely to be filled with imports. Urbanization, heavy industry growth, and increasing per-capita consumption are the primary drivers of rising coal usage. In 2006, the power sector, iron and steel, and cement accounted for 71% of coal consumption. Power generation is becoming more efficient, but even extensive roll-out of the highest efficiency units could save only 14% of projected 2025 coal demand. If China follows Japan, steel production would peak by 2015; cement is likely to follow a similar trajectory. A fourth wedge of future coal consumption is likely to come from the burgeoning coal-liquefaction and chemicals industries. New demand from coal-to-liquids and coal-to-chemicals may add 450 million tonnes of coal demand by 2025. Efficient growth among these drivers indicates that China's annual coal demand will reach 4.2 to …
Date:
June 20, 2008
Creator:
Aden, Nathaniel T.; Fridley, David G. & Zheng, Nina
System:
The UNT Digital Library
Extraction of macro-molecule images in cryo-EM micrographs
Advances in Electron Microscopy and single-particle reconstruction have led to results at increasingly high resolutions. This has opened up the possibility of complete automation of single particle reconstruction. Main bottleneck in automation of single particle reconstruction is manual selection of particles in the micrograph. This paper describes a simple but efficient approach for segmentation of particle projections in the micrographs obtained using cryo-electron microscope. Changing the shape of objects to facilitate segmentation from the cluster and reconstructing its actual shape after isolation is successfully attempted. Both low-level and high-level processing techniques are used and the whole process is made automatic. Over 90 percent success in automatic particle picking is achieved. Several areas for improvement and future research directions are discussed.
Date:
March 20, 2003
Creator:
Adiga, Umesha P.S.; Malladi, Ravi & Glaeser, Robert M.
System:
The UNT Digital Library
Finite Cosmology and a CMB Cold Spot
The standard cosmological model posits a spatially flat universe of infinite extent. However, no observation, even in principle, could verify that the matter extends to infinity. In this work we model the universe as a finite spherical ball of dust and dark energy, and obtain a lower limit estimate of its mass and present size: the mass is at least 5 x 10{sup 23}M{sub {circle_dot}} and the present radius is at least 50 Gly. If we are not too far from the dust-ball edge we might expect to see a cold spot in the cosmic microwave background, and there might be suppression of the low multipoles in the angular power spectrum. Thus the model may be testable, at least in principle. We also obtain and discuss the geometry exterior to the dust ball; it is Schwarzschild-de Sitter with a naked singularity, and provides an interesting picture of cosmogenesis. Finally we briefly sketch how radiation and inflation eras may be incorporated into the model.
Date:
March 20, 2006
Creator:
Adler, R. J.; Bjorken, J. D. & Overduin, J.M.
System:
The UNT Digital Library
Vocational Education in Prisons: An Investment for Yesterday's At-Risk Youth
Evaluation report documenting a study by the Texas Council on Vocational Education to assess vocational education within the Texas prison systems. The Council concluded that anyone in Texas prisons should have access to vocational education and the report includes recommendations about changes or improvements going forward.
Date:
December 20, 1992
Creator:
Advisory Council for Technical-Vocational Education in Texas
System:
The Portal to Texas History
LDUA software custodian`s notebook
This plan describes the activities to be performed and controls to be applied to the process of specifying, obtaining, and qualifying the control and data acquisition software for the Light Duty Utility Arm (LDUA) System. It serves the purpose of a software quality assurance plan, a verification and validation plan, and a configuration management plan. This plan applies to all software that is an integral part of the LDUA control and data acquisition system, that is, software that is installed in the computers that are part of the LDUA system as it is deployed in the field. This plan applies to the entire development process, including: requirements; design; implementation; and operations and maintenance. This plan does not apply to any software that is not integral with the LDUA system. This plan has-been prepared in accordance with WHC-CM-6-1 Engineering Practices, EP-2.1; WHC-CM-3-10 Software Practices; and WHC-CM-4-2, QR 19.0, Software Quality Assurance Requirements.
Date:
August 20, 1998
Creator:
Aftanas, B.L.
System:
The UNT Digital Library
100-C water plant
System curves for each portion of the C Area Water Plant were obtained from referenced work and are presented in figures. Field test data, corroborating the calculated curves, are presented as singular points on the same graphs. Present maxima capacity of the C Area Filter Plant was 121,000 gpm with 118,000 gpm available for use as primary reactor coolant. Modifications to the filter effluent piping would increase this available flow to about 180,000 gpm. Of the 118,000 gpm available for C Reactor use, 10,000 to 12,000 gpm was demanded by B Area through the 183 BC intertie. The maximum flow that the intertie line could handle, without reducing the filter capacity of the C Area filters, is about 21,000 gpm.
Date:
February 20, 1961
Creator:
Agar, J. D.
System:
The UNT Digital Library
Proposed graphite coring patterns for B, D, F, DR, and H Reactors
Heat transfer calculations were performed with the aid of the IBM 7090 to determine whether or not feasible graphite channel coring patterns could be adopted at the five older Hanford Reactors. The purpose of front and rear process channel coring is to significantly reduce or eliminate net expansion of the fringe graphite by raising the operating temperature above the annealing temperature of 300{degree}C. The results of the study show that such coring patterns are possible. Also, it was found to be possible, and indeed desirable, to standardize the patterns into one front face coring pattern and one rear face coring pattern for all five of the reactors: B, D, F, DR, and H. The resulting coring patterns are presented. These coring patterns will significantly reduce the net rate of expansion in the filler blocks and consequently reduce the inlet and outlet humps in the process channels. This will allow standard 8-inch fuel elements to be charged in all tubes. The afore-mentioned coring patterns will limit the pile gas atmosphere to a range of between 90% He - 10% CO{sub 2} and 100% He. If a greater percentage of CO{sub 2} were used following the adoption of the coring patterns, the …
Date:
June 20, 1963
Creator:
Agar, J. D.
System:
The UNT Digital Library
Design, Construction, and Operation of a Laboratory Scale Reactorfor the Production of High-Purity, Isotopically Enriched Bulksilicon
The design and operation of a recirculating flow reactor designed to convert isotopically enriched silane to polycrystalline Si with high efficiency and chemical purity is described. The starting material is SiF{sub 4}, which is enriched in the desired isotope by a centrifuge method and subsequently converted to silane. In the reactor, the silane is decomposed to silicon on the surface of a graphite starter rod (3 mm diameter) heated to 700-750 C. Flow and gas composition (0.3-0.5% silane in hydrogen) are chosen to minimize the generation of particles by homogeneous nucleation of silane and to attain uniform deposition along the length of the rod. Growth rates are 5 {micro}m/min, and the conversion efficiency is greater than 95%. A typical run produces 35 gm of polycrystalline Si deposited along a 150 mm length of the rod. After removal of the starter rod, dislocation-free single crystals are formed by the floating zone method. Crystals enriched in all 3 stable isotopes of Si have been made: {sup 28}Si (99.92%), {sup 29}Si (91.37%), and {sup 30}Si (88.25%). Concentrations of electrically active impurities (P and B) are as low as mid-10{sup 13} cm{sup -3}. Concentrations of C and O lie below 10{sup 16} and 10{sup …
Date:
December 20, 2004
Creator:
Ager, J. W., III; Beeman, J. W.; Hansen, W. L. & Haller, E. E.
System:
The UNT Digital Library
Globalization, Worker Insecurity, and Policy Approaches
This report discusses the trends driving global economic integration, sources of worker insecurity and policy approaches. There appears to be a range of views on the merits of each of these policy approaches and the extent to which they can be designed and implemented in a way that would reduce worker insecurity without undermining the benefits of globalization.
Date:
January 20, 2010
Creator:
Ahearn, Raymond J.
System:
The UNT Digital Library
Trade and the Americas
None
Date:
March 20, 2003
Creator:
Ahearn, Raymond J.
System:
The UNT Digital Library
Trade and the Americas
None
Date:
September 20, 2002
Creator:
Ahearn, Raymond J.
System:
The UNT Digital Library
U.S.-European Union Trade Relations: Issues and Policy Challenges
This report examines the economic partnership between the United States and the European Union. Not only is the U.S.-EU trade and investment relationship the largest in the world, but it is also arguably the most important. Agreement between the two partners in the past has been critical to making the world trading system more open and efficient.
Date:
May 20, 2005
Creator:
Ahearn, Raymond J.
System:
The UNT Digital Library
U.S.-European Union Trade Relations: Issues and Policy Challenges
None
Date:
June 20, 2005
Creator:
Ahearn, Raymond J.
System:
The UNT Digital Library
U.S.-Thailand Free Trade Agreement Negotiations
Report on the trade agreements between the United States and Thailand, including commercial relations, intellectual property rights, and more.
Date:
June 20, 2005
Creator:
Ahearn, Raymond J. & Morrison, Wayne M.
System:
The UNT Digital Library
Performing Neutron Cross-Section Measurements at RIA
The Rare Isotope Accelerator (RIA) is a proposed accelerator for the low energy nuclear physics community. Its goal is to understand the natural abundances of the elements heavier than iron, explore the nuclear force in systems far from stability, and study symmetry violation and fundamental physics in nuclei. To achieve these scientific goals, RIA promises to produce isotopes far from stability in sufficient quantities to allow experiments. It would also produce near stability isotopes at never before seen production rates, as much as 10{sup 12} pps. Included in these isotopes are many that are important to stockpile stewardship, such as {sup 87}Y, {sup 146-50}Eu, and {sup 231}Th. Given the expected production rates at RIA and a reasonably intense neutron source, one can expect to make {approx} 10 {micro}g targets of nuclei with a half-life of {approx}1 day. Thus, it will be possible at RIA to obtain experimental information on the neutron cross section for isotopes that have to date only been determined by theory. There are two methods to perform neutron cross-section measurements, prompt and delayed. The prompt method tries to measure each reaction as it happens. The exact technique employed will depend on the reaction of interest, (n,2n), (n,{gamma}), …
Date:
May 20, 2003
Creator:
Ahle, L. E.
System:
The UNT Digital Library
Task 1 Final Report, Theoretical/Mathematical Modeling of Ultrasonic Wave Propagation in Anisotropic Polycrystalline Stainless Steels
One of the tasks of the U.S. Nuclear Regulatory Commission-sponsored project titled "Reliability of Nondestructive Examination (NDE) for Nuclear Power Plant (NPP) Inservice Examination (ISI)" is to provide collaborative assistance to Commissariat à l’Energie Atomique (CEA) in France through theoretical predictions of ultrasonic scattering by grains of cast stainless steels (CASS) components. More specifically, a mathematical treatment of ultrasonic scattering in media having duplex micro¬structure is sought because cast stainless steel components often contains larger-scale macrograins that are composed of sub-grains/colonies. In this report, we present formal mathematical theories for ultrasonic wave propagation in polycrystalline aggregates having both simple (composed of grains only) and complex microstructures (having macrograins and sub-grains/colonies). Computations based on these theories are then carried out for ultrasonic backscatter power, attenuation due to scattering, and phase velocity dispersions. Specifically, numerical results are presented for backscatter coefficient for plane longitudinal wave propagating in duplex steel containing macrograins and colonies. Furthermore, the expected propagation characteristics (attenuation coefficient and phase velocity) are computed and described in this report for plane longitudinal waves propagating in (1) steels composed of randomly oriented grains, (2) [001] aligned grains encountered in austenitic stainless steel welds and casts, and (3) duplex steels.
Date:
April 20, 2009
Creator:
Ahmed, Salahuddin & Anderson, Michael T.
System:
The UNT Digital Library
Pay Equity - The Comparable Worth Issue: Equal Pay for Work of Equal Value; By What Standards and By What Means?
This report discusses the term comparable worth issue, a "theory that jobs dominated by women may be valued less not because of skills required or job content, but because they are "women's jobs (page 1)." The report analyzes historical events and lawsuits that relate to the issue of comparable worth in the workforce.
Date:
April 20, 1983
Creator:
Ahmuty, Alice L
System:
The UNT Digital Library
PRODUCTION OF NEW BIOMASS/WASTE-CONTAINING SOLID FUELS
CQ Inc. and its team members (ALSTOM Power Inc., Bliss Industries, McFadden Machine Company, and industry advisors from coal-burning utilities, equipment manufacturers, and the pellet fuels industry) addressed the objectives of the Department of Energy and industry to produce economical, new solid fuels from coal, biomass, and waste materials that reduce emissions from coal-fired boilers. This project builds on the team's commercial experience in composite fuels for energy production. The electric utility industry is interested in the use of biomass and wastes as fuel to reduce both emissions and fuel costs. In addition to these benefits, utilities also recognize the business advantage of consuming the waste byproducts of customers both to retain customers and to improve the public image of the industry. Unfortunately, biomass and waste byproducts can be troublesome fuels because of low bulk density, high moisture content, variable composition, handling and feeding problems, and inadequate information about combustion and emissions characteristics. Current methods of co-firing biomass and wastes either use a separate fuel receiving, storage, and boiler feed system, or mass burn the biomass by simply mixing it with coal on the storage pile. For biomass or biomass-containing composite fuels to be extensively used in the U.S., especially …
Date:
April 20, 2001
Creator:
Akers, David J.; Shirey, Glenn A.; Zitron, Zalman & Maney, Charles Q.
System:
The UNT Digital Library
U.S.-EU Trade and Economic Issues
This report discusses U.S.-EU trade and economic relations, which currently face heightened tension, particularly due to the Trump Administration's trade policy, which is focusing on unilateral tariff measures under U.S. trade law and taking a critical view of the U.S. role in international economic cooperation. Given U.S.-EU historical joint leadership on global trade and economic issues, these developments could have implications for the rules-based international trading system, a foundation of the global economic order that has contributed to global economic growth and stability in the post-World War II era.
Date:
July 20, 2018
Creator:
Akhtar, Shayerah Ilias
System:
The UNT Digital Library
U.S.-EU Trade and Investment Ties: Magnitude and Scope
This report provides background information and analysis on the trade and investment relationship between the United States and the European Union. It also discusses the EU economy and issues for Congress.
Date:
July 20, 2018
Creator:
Akhtar, Shayerah Ilias
System:
The UNT Digital Library
Progress Report for Annex II--Assessment of Solar Radiation Resources in Saudi Arabia 1993-1997
In 1987, the United States Department of Energy (DOE) and the King Abdulaziz City for Science and Technology (KACST) signed a five-year Agreement for Cooperation in the Field of Renewable Energy Research and Development (R and D), which has been extended to 2000. Tasks include: (1) upgrade solar radiation measurements in Saudi Arabia; (2) assemble a database of concurrent solar radiation, satellite (METEOSAT), and meteorological data; (3) adapt NREL models and other software for Saudi Arabia; (4) develop procedures, algorithms, and software to estimate solar irradiance; and (5) prepare a grid of solar radiation data for preparing maps and atlases and estimating solar radiation resources and solar energy system performances at locations in Saudi Arabia.
Date:
August 20, 1999
Creator:
Al-Amoudi, Anmed; Alawaji, Saleh H.; Cornwall, Chris; Mahfoodh, Mohammed bin; Marion, Bill; Maxwell, Eugene L. et al.
System:
The UNT Digital Library
Laboratory Directed Research and Development FY2001 Annual Report
Established by Congress in 1991, the Laboratory Directed Research and Development (LDRD) Program provides the Department of Energy (DOE)/National Nuclear Security Administration (NNSA) laboratories, like Lawrence Livermore National Laboratory (LLNL or the Laboratory), with the flexibility to invest up to 6% of their budget in long-term, high-risk, and potentially high payoff research and development (R&D) activities to support the DOE/NNSA's national security missions. By funding innovative R&D, the LDRD Program at LLNL develops and extends the Laboratory's intellectual foundations and maintains its vitality as a premier research institution. As proof of the Program's success, many of the research thrusts that started many years ago under LDRD sponsorship are at the core of today's programs. The LDRD Program, which serves as a proving ground for innovative ideas, is the Laboratory's most important single resource for fostering excellent science and technology for today's needs and tomorrow's challenges. Basic and applied research activities funded by LDRD enhance the Laboratory's core strengths, driving its technical vitality to create new capabilities that enable LLNL to meet DOE/NNSA's national security missions. The Program also plays a key role in building a world-class multidisciplinary workforce by engaging the Laboratory's best researchers, recruiting its future scientists and engineers, …
Date:
June 20, 2002
Creator:
Al-Ayat, R
System:
The UNT Digital Library