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Office of Scientific & Technical Information Technical Reports
5,777
USGS Topographic Map Collection
2,502
Congressional Research Service Reports
1,798
Texas State Publications
1,415
Government Accountability Office Reports
768
End of Term Publications
89
Texas Attorney General Opinions
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Texas State Auditor's Office: Reports
66
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12,582 Matching Results
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Abilene State Park
Map of the Abilene State Park outlining hiking trails and highlighting activities, facilities, and other features such as bathrooms, lodgings, water/electric, etc. It also contains general information for the park and for the Texas Parks and Wildlife Department.
Date:
February 2012
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Map
System:
The Portal to Texas History
Abilene West Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2012
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Ability to Repay, Risk-Retention Standards, and Mortgage Credit Access
This report examines the developments associated with the implementation of mortgage lending reforms. The report begins with a summary of proposed ability to repay and risk-retention standards. Next, the report describes risky underwriting and financing practices that occurred prior to the mortgage crisis, followed by a discussion of how access to mortgage credit might be affected.
Date:
June 5, 2012
Creator:
Getter, Darryl E.
Object Type:
Report
System:
The UNT Digital Library
Abiotic degradation rates for carbon tetrachloride and chloroform: Final report.
This report documents the objectives, technical approach, and progress made through FY 2012 on a project initiated in FY 2006 to help address uncertainties related to the rates of hydrolysis in groundwater for carbon tetrachloride (CT) and chloroform (CF). The project also sought to explore the possible effects of contact with minerals and sediment (i.e., heterogeneous hydrolysis) on these rates. We conducted 114 hydrolysis rate experiments in sealed vessels across a temperature range of 20-93 °C for periods as long as 6 years, and used the Arrhenius equation to estimate activation energies and calculate half-lives for typical Hanford groundwater conditions (temperature of 16 °C and pH of 7.75). We calculated a half-life of 630 years for hydrolysis for CT under these conditions and found that CT hydrolysis was unaffected by contact with sterilized, oxidized minerals or Hanford sediment within the sensitivity of our experiments. In contrast to CT, hydrolysis of CF was generally slower and very sensitive to pH due to the presence of both neutral and base-catalyzed hydrolysis pathways. We calculated a half-life of 3400 years for hydrolysis of CF in homogeneous solution at 16 °C and pH 7.75. Experiments in suspensions of Hanford sediment or smectite, the dominant …
Date:
December 1, 2012
Creator:
Amonette, James E.; Jeffers, Peter M.; Qafoku, Odeta; Russell, Colleen K.; Humphrys, Daniel R.; Wietsma, Thomas W. et al.
Object Type:
Report
System:
The UNT Digital Library
Ablative Richtmyer-Meshkov Experiments
None
Date:
September 28, 2012
Creator:
Smalyuk, V & Martinez, D
Object Type:
Report
System:
The UNT Digital Library
Ables Springs Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2012
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Abortion Services and Military Medical Facilities
The purpose of this report is to describe and discuss the provisions for providing abortion services to military personnel, their dependents, and other military health care beneficiaries at military medical facilities. The report describes the history of these provisions, with particular emphasis on legislative actions. Finally, this report discusses a number of proposals to modify the law, as well as other related legislative and administrative actions.
Date:
June 7, 2012
Creator:
Burrelli, David F.
Object Type:
Report
System:
The UNT Digital Library
Aboveground Petroleum Storage Tanks: A Guide for Owners and Operators of ASTs
"This document is a general guide to laws and regulations for aboveground storage tanks and an aid in minimizing potential risks."(p. 1).
Date:
February 2012
Creator:
Texas Commission on Environmental Quality
Object Type:
Book
System:
The Portal to Texas History
Abra Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2012
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Absence of Debye Sheaths Due to Secondary Electron Emission
A bounded plasma where the hot electrons impacting the walls produce more than one secondary on average is studied via particle-in-cell simulation. It is found that no classical Debye sheath or space-charge limited sheath exists. Ions are not drawn to the walls and electrons are not repelled. Hence the unconfined plasma electrons travel unobstructed to the walls, causing extreme particle and energy fluxes. Each wall has a positive charge, forming a small potential barrier or "inverse sheath" that pulls some secondaries back to the wall to maintain the zero current condition.
Date:
May 11, 2012
Creator:
Campanell, M. D.; Khabrov, A. & Kaganovich, I. D.
Object Type:
Report
System:
The UNT Digital Library
Absolute Determination of Charge-Coupled Device Quantum Detection Efficiency Using Si K-Edge X-Ray Absorption Fine Structure
We report a method to determine the quantum detection efficiency and the absorbing layers on a front-illuminated charge-coupled device (CCD). The CCD under study, as part of a crystal spectrometer, measures intense continuum x-ray emission from a picosecond laser-produced plasma and spectrally resolves the Si K-edge x-ray absorption fine structure features due to the electrode gate structure of the device. The CCD response across the Si K-edge shows a large discontinuity as well as a number of oscillations that are identified individually and uniquely from Si, SiO{sub 2}, and Si{sub 3}N{sub 4} layers. From the spectral analysis of the structure and K-edge discontinuity, the active layer thickness and the different absorbing layers thickness can be determined precisely. A precise CCD detection model from 0.2-10 keV can be deduced from this highly sensitive technique.
Date:
May 6, 2012
Creator:
Dunn, J. & Steel, A. B.
Object Type:
Article
System:
The UNT Digital Library
Absorber Alignment Measurement Tool for Solar Parabolic Trough Collectors: Preprint
As we pursue efforts to lower the capital and installation costs of parabolic trough solar collectors, it is essential to maintain high optical performance. While there are many optical tools available to measure the reflector slope errors of parabolic trough solar collectors, there are few tools to measure the absorber alignment. A new method is presented here to measure the absorber alignment in two dimensions to within 0.5 cm. The absorber alignment is measured using a digital camera and four photogrammetric targets. Physical contact with the receiver absorber or glass is not necessary. The alignment of the absorber is measured along its full length so that sagging of the absorber can be quantified with this technique. The resulting absorber alignment measurement provides critical information required to accurately determine the intercept factor of a collector.
Date:
April 1, 2012
Creator:
Stynes, J. K. & Ihas, B.
Object Type:
Article
System:
The UNT Digital Library
THE ABSORPTION OF HYDROGEN ON LOW PRESSURE HYDRIDE MATERIALS
For this study, hydrogen getter materials (Zircaloy-4 and pure zirconium) that have a high affinity for hydrogen (and low overpressure) have been investigated to determine the hydrogen equilibrium pressure on Zircaloy-4 and pure zirconium. These materials, as with most getter materials, offered significant challenges to overcome given the low hydrogen equilibrium pressure for the temperature range of interest. Hydrogen-zirconium data exists for pure zirconium at 500 C and the corresponding hydrogen overpressure is roughly 0.01 torr. This manuscript presents the results of the equilibrium pressures for the absorption and desorption of hydrogen on zirconium materials at temperatures ranging from 400 C to 600 C. The equilibrium pressures in this temperature region range from 150 mtorr at 600 C to less than 0.1 mtorr at 400 C. It has been shown that the Zircaloy-4 and zirconium samples are extremely prone to surface oxidation prior to and during heating. This oxidation precludes the hydrogen uptake, and therefore samples must be heated under a minimum vacuum of 5 x 10{sup -6} torr. In addition, the Zircaloy-4 samples should be heated at a sufficiently low rate to maintain the system pressure below 0.5 mtorr since an increase in pressure above 0.5 mtorr could possibly …
Date:
April 3, 2012
Creator:
Morgan, G. & Korinko, P.
Object Type:
Article
System:
The UNT Digital Library
ACA: A Brief Overview of the Law, Implementation, and Legal Challenges
This report summarizes the Affordable Care Act (ACA) and the legal challenges it has faced. The report contains information on various lawsuits due to the ACA and provides the reasoning behind them as Congress violating its enumerated powers in the constitution. Moreover, the report covers the challenges of implementing the law.
Date:
March 23, 2012
Creator:
Redhead, C. Stephen; Staman, Jennifer; Burrows, Vanessa K. & Fernandez, Bernadette
Object Type:
Report
System:
The UNT Digital Library
ACA: A Brief Overview of the Law, Implementation, and Legal Challenges
This report summarizes the Affordable Care Act (ACA) and the legal challenges it has faced. The report contains information on various lawsuits due to the ACA and provides the reasoning behind them as Congress violating its enumerated powers in the constitution. Moreover, the report covers the challenges of implementing the law.
Date:
July 3, 2012
Creator:
Redhead, C. Stephen; Chaikind, Hinda; Fernandez, Bernadette & Staman, Jennifer
Object Type:
Report
System:
The UNT Digital Library
Acampo Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2012
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Accelerated Corrosion of Stainless Steel in Thiocyanate-Containing Solutions
It is known that reduced sulfur compounds (such as thiocyanate and thiosulfate) can accelerate active corrosion of austenitic stainless steel in acid solutions, but before we started this project the mechanism of acceleration was largely unclear. This work combined electrochemical measurements and analysis using scanning electron microscopy (SEM) and X-ray photo-electron spectroscopy (XPS), which provided a comprehensive understanding of the catalytic effect of reduced sulfur species on the active corrosion of stainless steel. Both the behavior of the pure elements and the steel were studied and the work focused on the interaction between the pure elements of the steel, which is the least understood area. Upon completion of this work, several aspects are now much clearer. The main results from this work can be summarized as follows: The presence of low concentrations (around 0.1 mM) of thiocyanate or tetrathionate in dilute sulfuric acid greatly accelerates the anodic dissolution of chromium and nickel, but has an even stronger effect on stainless steels (iron-chromium-nickel alloys). Electrochemical measurements and surface analyses are in agreement with the suggestion that accelerated dissolution really results from suppressed passivation. Even well below the passivation potential, the electrochemical signature of passivation is evident in the electrode impedance; the …
Date:
September 19, 2012
Creator:
Pistorius, P. Chris & Li, Wen
Object Type:
Report
System:
The UNT Digital Library
Accelerated deployment of nanostructured hydrotreating catalysts. Final CRADA Report.
Nanomanufacturing offers an opportunity to create domestic jobs and facilitate economic growth. In response to this need, U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy issued a Research Call to develop nanomanufacturing capabilities at the National Laboratories. High performance catalysts represent a unique opportunity to deploy nanomanufacturing technologies. Re-refining of used lube oil offers an opportunity to create manufacturing jobs and decrease dependence on imported petroleum. Improved catalysts are required to produce a better quality product, decrease environmental impact, extend catalyst life, and improve overall economics of lube oil re-refining. Argonne National Laboratory (Argonne) in cooperation with Universal Lubricants, Inc. (ULI) and Chemical Engineering Partners (CEP) have carried out a Cooperative Research and Development Agreement (CRADA) to prepare nanostructured hydrotreating catalysts using atomic layer deposition (ALD) to exhibit superior performance for the re-refining of used lube oil. We investigated the upgrading of recycled lube oil by hydrogenation using commercial, synthetically-modified commercial catalysts, and synthesized catalysts. A down-flow (trickle bed) catalytic unit was used for the hydrogenation experiments. In addition to carrying out elemental analyses of the various feed and product fractions, characterization was undertaken using H{sup 1} and C{sup 13} NMR. Initially commercial were evaluated. Second these …
Date:
August 27, 2012
Creator:
Libera, J. A.; Snyder, S. W.; Mane, A.; Elam, J. W.; Cronauer, D. C.; Muntean, J. A. et al.
Object Type:
Report
System:
The UNT Digital Library
Accelerating a random forest classifier: multi-core, GP-GPU, or FPGA?
None
Date:
January 10, 2012
Creator:
Van Essen, B. C.; Macaraeg, C. C.; Prenger, R. & Gokhale, M.
Object Type:
Article
System:
The UNT Digital Library
Accelerating Atomic Orbital-based Electronic Structure Calculation via Pole Expansion plus Selected Inversion
We describe how to apply the recently developed pole expansion plus selected inversion (PEpSI) technique to Kohn-Sham density function theory (DFT) electronic structure calculations that are based on atomic orbital discretization. We give analytic expressions for evaluating charge density, total energy, Helmholtz free energy and atomic forces without using the eigenvalues and eigenvectors of the Kohn-Sham Hamiltonian. We also show how to update the chemical potential without using Kohn-Sham eigenvalues. The advantage of using PEpSI is that it has a much lower computational complexity than that associated with the matrix diagonalization procedure. We demonstrate the performance gain by comparing the timing of PEpSI with that of diagonalization on insulating and metallic nanotubes. For these quasi-1D systems, the complexity of PEpSI is linear with respect to the number of atoms. This linear scaling can be observed in our computational experiments when the number of atoms in a nanotube is larger than a few hundreds. Both the wall clock time and the memory requirement of PEpSI is modest. This makes it even possible to perform Kohn-Sham DFT calculations for 10,000-atom nanotubes on a single processor. We also show that the use of PEpSI does not lead to loss of accuracy required in …
Date:
February 10, 2012
Creator:
Lin, Lin; Chen, Mohan; Yang, Chao & He, Lixin
Object Type:
Article
System:
The UNT Digital Library
Accelerating Commercialization of Algal Biofuels Through Partnerships (Brochure)
This brochure describes NREL's algal biofuels research capabilities and partnership opportunities.
Date:
September 1, 2012
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Accelerating Development of EV Batteries Through Computer-Aided Engineering
The Department of Energy's Vehicle Technology Program has launched the Computer-Aided Engineering for Automotive Batteries (CAEBAT) project to work with national labs, industry and software venders to develop sophisticated software. As coordinator, NREL has teamed with a number of companies to help improve and accelerate battery design and production. This presentation provides an overview of CAEBAT, including its predictive computer simulation of Li-ion batteries known as the Multi-Scale Multi-Dimensional (MSMD) model framework. MSMD's modular, flexible architecture connects the physics of battery charge/discharge processes, thermal control, safety and reliability in a computationally efficient manner. This allows independent development of submodels at the cell and pack levels.
Date:
December 1, 2012
Creator:
Pesaran, A.; Kim, G. H.; Smith, K. & Santhanagopalan, S.
Object Type:
Presentation
System:
The UNT Digital Library
Acceleration and transportation of multiple ion species at EBIS-based preinjector
N/A
Date:
September 17, 2012
Creator:
Raparia, D.
Object Type:
Article
System:
The UNT Digital Library
Accelerator R&D: Research for Science - Science for Society
In September 2011 the US Senate Appropriations Committee requested a ten-year strategic plan from the Department of Energy (DOE) that would describe how accelerator R&D today could advance applications directly relevant to society. Based on the 2009 workshop 'Accelerators for America's Future' an assessment was made on how accelerator technology developed by the nation's laboratories and universities could directly translate into a competitive strength for industrial partners and a variety of government agencies in the research, defense and national security sectors. The Office of High Energy Physics, traditionally the steward for advanced accelerator R&D within DOE, commissioned a task force under its auspices to generate and compile ideas on how best to implement strategies that would help fulfill the needs of industry and other agencies, while maintaining focus on its core mission of fundamental science investigation.
Date:
July 2012
Creator:
Holtkamp, N.; Biedron, S.; Boeh, L.; Clayton, J.; Gourlay, S.; Hamm, R. et al.
Object Type:
Article
System:
The UNT Digital Library