Collection
United States Census Map Collection
882
Office of Scientific & Technical Information Technical Reports
114
Congressional Research Service Reports
64
Government Accountability Office Reports
15
Federal Register
8
Texas Attorney General Opinions
3
CyberCemetery Extracted Publications
2
Texas Register
2
Texas State Publications
2
CyberCemetery
1
Country
Year
Month
Day
Language
1,093 Matching Results
Results open in a new window/tab.
Hot Electron Measurements in Ignition Relevant Hohlraums on the National Ignition Facility
None
Date:
May 10, 2010
Creator:
Dewald, E L; Thomas, C; Hunter, S; Divol, L; Meezan, N; Glenzer, S H et al.
Object Type:
Article
System:
The UNT Digital Library
Data Quality Objectives for Selecting Waste Samples for the Bench Steam Reformer Test
This document describes the data quality objectives to select archived samples located at the 222-S Laboratory for Fluid Bed Steam Reformer testing. The type, quantity and quality of the data required to select the samples for Fluid Bed Steam Reformer testing are discusses.
Date:
August 10, 2010
Creator:
Dl, Banning
Object Type:
Report
System:
The UNT Digital Library
Penetration of the LCLS Injector Shield Wall at Sector 20
Penetrations through the LCLS injector shield wall are needed for the alignment of the accelerator, a diagnostic laser beam and utilities, and are shown in figure 1. The 1-inch diameter LCLS injector beam tube is blocked by the PPS stopper when the injector side of the wall is occupied. The two 3-inch diameter penetrations above and to the left of the beam tube are used by Precision Alignment and will be open only during installation of the injector beamline. Additional 3-inch diameter penetrations are for laser beams which will be used for electron beam diagnostics. These will not be plugged when the injector occupied. Other penetrations for the RF waveguide and other utilities are approximately 13-inch from the floor and as such are far from the line-of-sight of any radiation sources. The waveguide and utility penetrations pass only through the thicker wall as shown in the figure. The principal issue is with the two laser penetrations, since these will be open when the linac is operating and people are in the LCLS injector area. A principal concern is radiation streaming through the penetrations due to direct line-of sight of the PEP-2 lines. To answer this, fans of rays were traced …
Date:
December 10, 2010
Creator:
Dowell, D
Object Type:
Report
System:
The UNT Digital Library
Ice Formation in Gas-Diffusion Layers
Under sub-freezing conditions, ice forms in the gas-diffusion layer (GDL) of a proton exchange membrane fuel cell (PEMFC) drastically reducing cell performance. Although a number of strategies exist to prevent ice formation, there is little fundamental understanding of the mechanisms of freezing within PEMFC components. Differential scanning calorimetry (DSC) is used to elucidate the effects of hydrophobicity (Teflon® loading) and water saturation on the rate of ice formation within three commercial GDLs. We find that as the Teflon® loading increases, the crystallization temperature decreases due to a change in internal ice/substrate contact angle, as well as the attainable level of water saturation. Classical nucleation theory predicts the correct trend in freezing temperature with Teflon® loading.
Date:
July 10, 2010
Creator:
Dursch, Thomas; Radke, Clayton J. & Weber, Adam Z.
Object Type:
Article
System:
The UNT Digital Library
Room-temperature scintillation properties of cerium-doped REOX (RE=Y, La, Gd, and Lu; X=F, Cl, Br, and I)
The scintillation properties of cerium-doped oxyhalides following the general formula REOX (RE=Y, La, Gd, and Lu; X=F, Cl, Br, and I) are reported. These materials were synthesized under dry conditions as microcrystalline powders from conventional solid state reactions. The room temperature X-ray excited emission and scintillation decay curves were measured and analyzed for each material. Additionally, the hygroscopic nature of the oxychlorides and oxybromides was compared to that of their corresponding rare earth halides. The yttrium, lanthanum, and gadolinium oxychlorides, and all of the oxybromides and oxyiodides are found to be activated by Ce{sup 3+}. GdOBr doped with 0.5% Ce{sup 3+} has the highest light output with a relative luminosity of about one-half that of LaBr{sub 3}: Ce{sup 3+}. It displays a single exponential decay of 30 ns.
Date:
December 10, 2010
Creator:
Eagleman, Yetta; Bourret-Courchesne, Edith & Derenzo, Stephen
Object Type:
Article
System:
The UNT Digital Library
Liquid X-ray diffraction on the NIF: Phase transitions into and within the liquid phase
None
Date:
June 10, 2010
Creator:
Eggert, J
Object Type:
Report
System:
The UNT Digital Library
X-ray diffraction studies of dynamically compressed diamond
None
Date:
June 10, 2010
Creator:
Eggert, J
Object Type:
Report
System:
The UNT Digital Library
Criminal Prohibitions on the Publication of Classified Defense Information
The recent online publication of classified defense documents by the organization Wikileaks and subsequent reporting by the New York Times and other news media have focused attention on whether such publication violates U.S. criminal law. This report discusses the statutory prohibitions that may be implicated, including the Espionage Act; the extraterritorial application of such statutes; and the First Amendment implications related to such prosecutions against domestic or foreign media organizations and associated individuals.
Date:
September 10, 2010
Creator:
Elsea, Jennifer K.
Object Type:
Report
System:
The UNT Digital Library
Sludge Batch Supplemental Srat Runs Effects of Yield Stress and Cycle Time Increase
The Defense Waste Processing Facility (DWPF) has transitioned from Sludge Batch 5 (SB5) processing to Sludge Batch 6 (SB6) processing. Phase III-Tank 40 Chemical Process Cell (CPC) flowsheet simulations have been completed to determine the initial processing conditions for the DWPF transition. The impact of higher yield stress (SB-25) and cycle time extension (SB6-26) on the physical and chemical effects of SB6 processing during the SRAT (Sludge Receipt and Adjustment Tank) cycle were evaluated. No significant impacts on the SRAT chemistry were noted during the higher yield stress run. In particular, no impact on mercury stripping was noted, indicating that settling of elemental mercury was not the primary factor in the low mercury recovery noted in the flowsheet testing. The SRAT product from this run retained the higher yield stress of the starting sludge. The run indicated that ultrasonication is an effective tool to increase the yield stress of simulants to targeted values and the chemistry of downstream processing is not impacted. Significant differences were noted in the cycle time extension test compared to the Phase III flowsheet baseline runs. Large decreases in the ammonia and hydrogen generation rates were noted along with reduced mercury stripping efficiency. The latter effect …
Date:
August 10, 2010
Creator:
Fernandez, A.
Object Type:
Report
System:
The UNT Digital Library
Measure Of Quasi-Static Toughness And Fracture Parameters For Mock Explosive And Insensitive High Explosive LX-17
None
Date:
March 10, 2010
Creator:
Ferranti, L., Jr.; Gagliardi, F. J.; Cunningham, B. J. & Vandersall, K. S.
Object Type:
Article
System:
The UNT Digital Library
Reauthorizing the Office of National Drug Control Policy: Issues for Consideration
This report provides a discussion of the National Drug Control Strategy, the National Drug Control Budget, and the Office of National Drug Control Policy's (ONDCP's) evaluation of the National Drug Control Strategy implementation. It then provides an analysis of selected legislative and oversight issues that Congress may consider when debating the reauthorization of ONDCP. Policymakers may question the status of the war on drugs, whether drug use should be seen as more of a law enforcement issue or a public health issue, and whether drug control resources are more effective when directed toward prevention and treatment or toward law enforcement. Another issue for consideration is whether the National Drug Control Budget--as currently conceived--represents a comprehensive view of federal drug control activities in the United States. Further, Congress may exercise oversight over ONDCP's means of evaluating the nation's federal drug control programs.
Date:
December 10, 2010
Creator:
Finklea, Kristin M.
Object Type:
Report
System:
The UNT Digital Library
Surface Transportation Funding and Finance
This report discusses changes in funding to the national surface transportation infrastructure, especially in light of the recession that began in 2007, which led to decreases in driving and fuel use. This report focuses on possible revenue sources for surface transportation infrastructure. It begins with a brief discussion of the problems associated with the trust fund financing system and then explores possible immediate and longer-term solutions to the financing problem.
Date:
November 10, 2010
Creator:
Fischer, John W.; Kirk, Robert S. & Mallett, William J.
Object Type:
Report
System:
The UNT Digital Library
Surface Transportation Funding and Finance
This report discusses changes in funding to the national surface transportation infrastructure, especially in light of the recession that began in 2007, which led to decreases in driving and fuel use. This report focuses on possible revenue sources for surface transportation infrastructure. It begins with a brief discussion of the problems associated with the trust fund financing system and then explores possible immediate and longer-term solutions to the financing problem.
Date:
November 10, 2010
Creator:
Fischer, John W.; Kirk, Robert S. & Mallett, William J.
Object Type:
Report
System:
The UNT Digital Library
Imaging Fluid Flow in Geothermal Wells Using Distributed Thermal Perturbation Sensing
The objective of Task 2 is to develop a numerical method for the efficient and accurate analysis of distributed thermal perturbation sensing (DTPS) data for (1) imaging flow profiles and (2) in situ determination of thermal conductivities and heat fluxes. Numerical forward and inverse modeling is employed to: (1) Examine heat and fluid flow processes near a geothermal well under heating and cooling conditions; (2) Demonstrate ability to interpret DTPS thermal profiles with acceptable estimation uncertainty using inverse modeling of synthetic temperature data; and (3) Develop template model and analysis procedure for the inversion of temperature data collected during a thermal perturbation test using fiber-optic distributed temperature sensors. This status report summarizes initial model developments and analyses.
Date:
December 10, 2010
Creator:
Freifeld, B. & Finsterle, S.
Object Type:
Report
System:
The UNT Digital Library
Electron and Photon Interactions in the Regime of Strong LPM Suppression
Most searches for ultra-high energy (UHE) astrophysical neutrinos look for radio emission from the electromagnetic and hadronic showers produced in their interactions. The radio frequency spectrum and angular distribution depend on the shower development, so are sensitive to the interaction cross sections. At energies above about 1016 eV (in ice), the Landau-Pomeranchuk-Migdal (LPM) effect significantly reduces the cross sections for the two dominant electromagnetic interactions: bremsstrahlung and pair production. At higher energies, above about 1020 eV, the photonuclear cross section becomes larger than that for pair production, and direct pair production and electronuclear interactions become dominant over bremsstrahlung. The electron interaction length reaches a maximum around 1021 eV, and then decreases slowly as the electron energy increases further. In this regime, the growth in the photon cross section and electron energy loss moderates the rise in nu e shower length, which rises from ~;;5 m at 1016 eV to ~;;40 m at 1019 eV and ~;;100 m at 1020 eV, but only to ~;;300 m at 1024 eV. In contrast, without photonuclear and electronuclear interactions, the shower length would be over 10 km at 1024 eV.
Date:
June 10, 2010
Creator:
Gerhardt, L. & Klein, S.
Object Type:
Article
System:
The UNT Digital Library
F-35 Alternate Engine Program: Background and Issues for Congress
This report discusses the past four years of administration proposals to terminate the program to develop the General Electric/Rolls-Royce F136 engine as an alternative to the Pratt & Whitney F135 engine that currently powers the F-35 Joint Strike Fighter (JSF). These proposals have been continually rejected by Congress. The Obama Administration's FY2011 budget submission against proposes to terminate the program. This report explores both sides of the termination argument.
Date:
November 10, 2010
Creator:
Gertler, Jeremiah
Object Type:
Report
System:
The UNT Digital Library
F-35 Joint Strike Fighter (JSF) Program: Background and Issues for Congress
The F-35 Joint Strike Fighter (JSF), also called the Lighting II, is a new strike fighter being procured in different versions by the Air Force, Marine Corps, and Navy. The F-35 program is the Department of Defense's (DOD's) largest weapon procurement program in terms of total estimated acquisition cost. This report details the Obama Administration's proposed FY2010 defense budget requests for F-35 program funding and outlines the issues that Congress must consider when deciding whether to approve, reject, or modify the administration's funding requests.
Date:
November 10, 2010
Creator:
Gertler, Jeremiah
Object Type:
Report
System:
The UNT Digital Library
Biological Systems for Hydrogen Photoproduction
This presentation summarizes biological systems for hydrogen photoproduction.
Date:
June 10, 2010
Creator:
Ghirardi, M.
Object Type:
Presentation
System:
The UNT Digital Library
The response of the HMX-based material PBXN-9 to thermal insults: thermal decomposition kinetics and morphological changes
PBXN-9, an HMX-formulation, is thermally damaged and thermally decomposed in order to determine the morphological changes and decomposition kinetics that occur in the material after mild to moderate heating. The material and its constituents were decomposed using standard thermal analysis techniques (DSC and TGA) and the decomposition kinetics are reported using different kinetic models. Pressed parts and prill were thermally damaged, i.e. heated to temperatures that resulted in material changes but did not result in significant decomposition or explosion, and analyzed. In general, the thermally damaged samples showed a significant increase in porosity and decrease in density and a small amount of weight loss. These PBXN-9 samples appear to sustain more thermal damage than similar HMX-Viton A formulations and the most likely reasons are the decomposition/evaporation of a volatile plasticizer and a polymorphic transition of the HMX from {beta} to {delta} phase.
Date:
December 10, 2010
Creator:
Glascoe, E. A.; Hsu, P. C.; Springer, H. K.; DeHaven, M. R.; Tan, N. & Turner, H. C.
Object Type:
Article
System:
The UNT Digital Library
Results from the Cooler and Lead Tests
The report presents the results of testing MICE spectrometer magnet current leads on a test apparatus that combines both the copper leads and the high temperature superconducting (HTS) leads with a single Cryomech PT415 cooler and liquid helium tank. The current is carried through the copper leads from 300 K to the top of the HTS leads. The current is then carried through the HTS leads to a feed-through from the vacuum space to the inside of a liquid helium tank. The experiment allows one to measure the performance of both cooler stages along with the performance of the leads. While the leads were powered we measured the voltage drops through the copper leads, through the HTS leads, through spliced to the feed-through, through the feed-through and through the low-temperature superconducting loop that connects one lead to the other. Measurements were made using the leads that were used in spectrometer magnet 1A and spectrometer magnet 2A. These are the same leads that were used for Superbend and Venus magnets at LBNL. The IL/A for these leads was 5.2 x 10{sup 6} m{sup -1}. The leads turned out to be too long. The same measurements were made using the leads that …
Date:
June 10, 2010
Creator:
Green, Michael A.
Object Type:
Report
System:
The UNT Digital Library
Conventional Arms Transfers to Developing Nations, 2002-2009
This report provides Congress with official, unclassified, quantitative data on conventional arms transfers to developing nations by the United States and foreign countries for the preceding eight calendar years for use in its policy oversight functions.
Date:
September 10, 2010
Creator:
Grimmett, Richard F.
Object Type:
Report
System:
The UNT Digital Library
25 Year Lifetime for Flexible Buildings Integrated Photovoltaics
Although preliminary proof-of-principle of the efficacy of barrier materials and processes, first developed by Battelle at PNNL and commercialized by Vitex, has been demonstrated at the laboratory scale, there are several challenges to the practical commercial implementation of these developments in the Buildings Integrated Photovoltaics (BIPV) market. Two important issues that are addressed in this project are identifying a low cost substrate material that can survive in the outside environment (rain, heat, dust, hail, etc.) for 25 years and developing an encapsulation method for the photovoltaic (PV) cells that can meet the required barrier performance without driving the cost of the total barrier package out of range (remaining below $3.00/Wp). Without these solutions, current encapsulation technologies will limit the use of PV for BIPV applications. Flexible, light-weight packaging that can withstand 25 years in the field is required for a totally flexible integrated PV package. The benefit of this research is to make substantial progress in the development of a cost-effective, viable thin film barrier package which will be a critical enabling technology to meet the Solar America Initiative cost and device reliability goals, and to make photovoltaics (PV) more cost-competitive with electricity generated using fossil fuels. Increased PV installations …
Date:
July 10, 2010
Creator:
Gross, Mark E.
Object Type:
Report
System:
The UNT Digital Library
Strain Induced Magnetism in SrRuO3 Epitaxial Thin Films
Epitaxial SrRuO{sub 3} thin films were grown on SrTiO{sub 3}, (LaAlO{sub 3}){sub 0.3}(SrAlO{sub 3}){sub 0.7} and LaAlO{sub 3} substrates inducing different biaxial compressive strains. Coherently strained SrRuO{sub 3} films exhibit enhanced magnetization compared to previously reported bulk and thin film values of 1.1-1.6 {micro}{sub B} per formula unit. A comparison of (001) and (110) SrRuO{sub 3} films on each substrate indicates that films on (110) oriented have consistently higher saturated moments than corresponding (001) films. These observations indicate the importance of lattice distortions in controlling the magnetic ground state in this transitional metal oxide.
Date:
January 10, 2010
Creator:
Grutter, A.; Wong, F.; Arenholz, E.; Liberati, M. & Suzuki, Y.
Object Type:
Article
System:
The UNT Digital Library
Axions from cosmic string and wall decay
If inflation occurred with a reheat temperature > T{sub PQ}, axions from the decay of global axion strings and domain walls would make an important contribution to the cosmological energy density, comparable to that from vacuum misalignment. Several groups have numerically studied the evolution of axion strings and walls in the past, however substantial uncertainties remain in their contribution to the present density {Omega}{sub a,string+wall} {approx} 1-100 (f{sub a}/10{sup 12} GeV){sup 7/6}, where f{sub a} is the axion decay constant. I will describe the numerical methods used in our simulations and show results for several string and wall configurations.
Date:
March 10, 2010
Creator:
Hagmann, C A
Object Type:
Article
System:
The UNT Digital Library