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149
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57
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52
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43
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39
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State, Foreign Operations, and Related Programs: FY2011 Budget and Appropriations
This report analyzes the FY2011 request, recent-year funding trends, and congressional action related to FY2011 State-Foreign Operations legislation.
Date:
March 23, 2011
Creator:
Lawson, Marian Leonardo; Epstein, Susan B. & Resler, Tamara J.
Object Type:
Report
System:
The UNT Digital Library
Haiti's National Elections: Issues and Concerns
This report provides an overview of the controversies surrounding the first round of Haitian presidential and legislative voting in late 2010, and concerns related to the second and final round of the elections.
Date:
March 23, 2011
Creator:
Taft-Morales, Maureen
Object Type:
Report
System:
The UNT Digital Library
Materials Evaluation Test Series (METS) 04, 05, and 06
The purpose of this work is to examine the environmental, safety, health and operational aspects of detonating a confined explosive test apparatus that has been designed to maximize the dynamics of impact on beryllium metal components for Contained Firing Facility (CFF) applications. A combination of experimental collection and evaluation methods were designed and implemented to provide an evaluation of immediately postdetonation by-products reflecting a potential worst-case scenario beryllium aerosolization explosive event. The collective Material Evaluation Test Series (METS) 04 - 06 provided explosive devices designed to scale for the dedicated METS firing tank that would provide a post-detonation internal environment comparable to the CFF. The experimental results provided appropriate information to develop operational parameters to be considered for conducting full-scale beryllium-containing experimental tests with similar designs within CFF and B801A. These operational procedures include the inclusion of chelating agents in pre-shot CFF cardboard containers with a minimum of 600 gallons content, an extended time period post-test before purging the CFF chamber, and an adaptation of approaches toward applications of the scrubber and HEPA systems during the post-shot sequence for an integrated environmental, safety, and health approach. In addition, re-entry and film retrieval procedures will be adapted, in line with abatement …
Date:
March 23, 2006
Creator:
Zalk, D.; Ingram, C.; Simmons, L.; Arganbright, R.; Lyle, J. & Wong, K.
Object Type:
Report
System:
The UNT Digital Library
Stark Tuning of Donor Electron Spins of Silicon
We report Stark shift measurements for {sup 121}Sb donor electron spins in silicon using pulsed electron spin resonance. Interdigitated metal gates on top of a Sb-implanted {sup 28}Si epi-layer are used to apply electric fields. Two Stark effects are resolved: a decrease of the hyperfine coupling between electron and nuclear spins of the donor and a decrease in electron Zeeman g-factor. The hyperfine term prevails at X-band magnetic fields of 0.35T, while the g-factor term is expected to dominate at higher magnetic fields. A significant linear Stark effect is also resolved presumably arising from strain.
Date:
March 23, 2006
Creator:
Bradbury, Forrest R.; Tyryshkin, Alexei M.; Sabouret, Guillaume; Bokor, Jeff; Schenkel, Thomas & Lyon, Stephen A.
Object Type:
Article
System:
The UNT Digital Library
Subsonic capability of Pratt and Whitney turbojet power plants
None
Date:
March 23, 1960
Creator:
Nicoll, H. E.
Object Type:
Report
System:
The UNT Digital Library
Vlt and Acs Observations of RDCS J1252.9-2927: Dynamical Structure and Galaxy Populations in a Massive Cluster at Z=1.237*
We present results from an extensive spectroscopic survey, carried out with FORS on the ESO Very Large Telescope, and from an extensive multi-wavelength imaging data set from the Advanced Camera for Surveys and ground based facilities of the cluster of galaxies RDCS J1252.9-2927. We have spectroscopically confirmed 38 cluster members in the redshift range 1.22 < z < 1.25. The distribution in velocity of these spectroscopic members yields a cluster median redshift of z = 1.237 and a rest-frame velocity dispersion of 747{sub -84}{sup +74} km s{sup -1}. Star-forming members are observed to mainly populate the outskirts of the cluster while passive galaxies dominate the central cluster region. Using the 38 confirmed redshifts, we were able to resolve, for the first time at z > 1, kinematic structure. The velocity distribution, which is not Gaussian at the 95% confidence level, is consistent with two groups that are also responsible for the projected elongation of the cluster in the East-West direction. The groups are composed of 26 and 12 galaxies and have velocity dispersions of 486{sub -85}{sup +47} km s{sup -1} and 426{sub -105}{sup +57} km s{sup -1}, respectively. The elongation is also seen in the intracluster gas (from X-ray observations) …
Date:
March 23, 2007
Creator:
Demarco, R.; Rosati, P.; Lidman, C.; Girardi, M.; Nonino, M.; Rettura, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Influence of argon and oxygen on charge-state-resolved ion energydistributions of filtered aluminum arcs
The charge-state-resolved ion energy distributions (IEDs) in filtered aluminum vacuum arc plasmas were measured and analyzed at different oxygen and argon pressures in the range 0.5 8.0 mTorr. A significant reduction of the ion energy was detected as the pressure was increased, most pronounced in an argon environment and for the higher charge states. The corresponding average charge state decreased from 1.87 to 1.0 with increasing pressure. The IEDs of all metal ions in oxygen were fitted with shifted Maxwellian distributions. The results show that it is possible to obtain a plasma composition with a narrow charge-state distribution as well as a narrow IED. These data may enable tailoring thin-film properties through selecting growth conditions that are characterized by predefined charge state and energy distributions.
Date:
March 23, 2006
Creator:
Rosen, Johanna; Anders, Andre; Mraz, Stanislav; Atiser, Adil & Schneider, Jochen M.
Object Type:
Article
System:
The UNT Digital Library
Hydrologic Resources Management Program and Underground Test Area Project FY2005 Progress Report
This report describes FY 2005 technical studies conducted by the Chemical Biology and Nuclear Science Division (CBND) at Lawrence Livermore National Laboratory (LLNL) in support of the Hydrologic Resources Management Program (HRMP) and the Underground Test Area Project (UGTA). These programs are administered by the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office (NNSA/NSO) through the Defense Programs and Environmental Restoration Divisions, respectively. HRMP-sponsored work is directed toward the responsible management of the natural resources at the Nevada Test Site (NTS), enabling its continued use as a staging area for strategic operations in support of national security. UGTA-funded work emphasizes the development of an integrated set of groundwater flow and contaminant transport models to predict the extent of radionuclide migration from underground nuclear testing areas at the NTS. The report is organized on a topical basis and contains five chapters that highlight technical work products produced by CBND. However, it is important to recognize that most of this work involves collaborative partnerships with the other HRMP and UGTA contract organizations. These groups include the Energy and Environment Directorate at LLNL (LLNL-E&E), Los Alamos National Laboratory (LANL), the Desert Research Institute (DRI), the U.S. Geological Survey (USGS), Stoller-Navarro …
Date:
March 23, 2007
Creator:
Eaton, G. F.; Genetti, V.; Hu, Q.; Hudson, G. B.; Kersting, A. B.; Lindvall, R. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Nano-subgrain Strengthening in Ball-milled Iron
The strength and deformation behavior of ball-milled, iron-base materials containing nano-scale subgrains have been evaluated. As reported by several authors, nanosubgrains form during the early stages of ball milling as a result of severe plastic deformation inherent in the ball milling process. The strength for these nano-scale subgrains are compared with the strength of larger-scale subgrains in iron and iron-base alloys produced by traditional mechanical working. The data covers over 2 orders of magnitude in subgrain size (from 30 nm to 6 {micro}m) and shows a continuous pattern of behavior. For all materials studied, the strength varied as {lambda}{sup -1}, where {lambda} is the subgrain size. Strengthening from subgrains was found to breakdown at a much smaller subgrain size than strengthening from grains. In addition, the ball-milled materials showed significant strengthening contributions from nano-scale oxide particles. Shear bands are developed during testing of ball-milled materials containing ultra-fine subgrains. A model for shear band development in nano-scale subgrains during deformation has also been developed. The model predicts a strain state of uniaxial compression in the shear band with a strain of -1.24. Subgrains are shown to offer the opportunity for high strength and good work hardening with the absence of yield …
Date:
March 23, 2006
Creator:
Lesuer, D R; Syn, C K & Sherby, O D
Object Type:
Article
System:
The UNT Digital Library
Formation, Stability, and Mobility of One-Dimensional Lipid Bilayer on High Curvature Substrates
Curved lipid membranes are ubiquitous in living systems and play an important role in many biological processes. To understand how curvature and lipid composition affect membrane formation and fluidity we have assembled and studied mixed 1,2-Dioleoyl-sn-Glycero-3-Phosphocholine (DOPC) and 1,2-Dioleoyl-sn-Glycero-3-Phosphoethanolamine (DOPE) supported lipid bilayers on amorphous silicon nanowires with controlled diameters ranging from 20 nm to 200 nm. Addition of cone-shaped DOPE molecules to cylindrical DOPC molecules promotes vesicle fusion and bilayer formation on smaller diameter nanowires. Our experiments demonstrate that nanowire-supported bilayers are mobile, exhibit fast recovery after photobleaching, and have low concentration of defects. Lipid diffusion coefficients in these high-curvature tubular membranes are comparable to the values reported for flat supported bilayers and increase with decreasing nanowire diameter.
Date:
March 23, 2007
Creator:
Huang, J.; Martinez, J.; Artyukhin, A.; Sirbuly, D.; Wang, Y.; Ju, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Supersonic capability of Pratt and Whitney turbojet power plants
None
Date:
March 23, 1960
Creator:
Thome, P.G.
Object Type:
Report
System:
The UNT Digital Library
Effect of solution saturation state and temperature on diopside dissolution
Steady-state dissolution rates of diopside are measured as a function of solution saturation state using a titanium flow-through reactor at pH 7.5 and temperature ranging from 125 to 175 C. Diopside dissolved stoichiometrically under all experimental conditions and rates were not dependent on sample history. At each temperature, rates continuously decreased by two orders of magnitude as equilibrium was approached and did not exhibit a dissolution plateau of constant rates at high degrees of undersaturation. The variation of diopside dissolution rates with solution saturation can be described equally well with a ion exchange model based on transition state theory or pit nucleation model based on crystal growth/dissolution theory from 125 to 175 C. At 175 C, both models over predict dissolution rates by two orders of magnitude indicating that a secondary phase precipitated in the experiments. The ion exchange model assumes the formation of a Si-rich, Mg-deficient precursor complex. Lack of dependence of rates on steady-state aqueous calcium concentration supports the formation of such a complex, which is formed by exchange of protons for magnesium ions at the surface.
Date:
March 23, 2007
Creator:
Dixit, S & Carroll, S A
Object Type:
Article
System:
The UNT Digital Library
Power plant weight status. 140E1 (ACT)
None
Date:
March 23, 1961
Creator:
Phelps, E.
Object Type:
Report
System:
The UNT Digital Library
Canning Furnace
Patent for a canning furnace. Illustration included.
Date:
March 23, 1909
Creator:
May, Callie C.
Object Type:
Patent
System:
The Portal to Texas History
Cabinet
Patent for a phonograph cabinet which has specialized storage for records with a built in cataloging and record finding system composed of letters running horizontally across the cabinet and numbers on a sliding strip which when put together with a letter will indicate the position of the record.
Date:
March 23, 1909
Creator:
Keltz, Eugene
Object Type:
Patent
System:
The Portal to Texas History
Cement.
Patent for cement of the type commonly known as Keene's cement, which is harder and glossier than other types of cement.
Date:
March 23, 1909
Creator:
Jones, Thomas
Object Type:
Patent
System:
The Portal to Texas History
Enzymatic desulfurization of coal
Our experimental approach focuses on the use of enzymes which catalyze the addition of oxygen to organic compounds. In tailoring the application of these enzymes to coal processing, we are particularly interested in ensuring that oxidation occurs at sulfur and not at carbon-carbon bonds. Previous studies with DBT have shown that the reaction most frequently observed in microbial oxidative pathways is one in which DBT is oxidized at ring carbons. These reactions, as we have said, are accompanied by a considerable decrease in the energy content of the compound. In addition, microbial pathways have been identified in which the sulfur atom is sequentially oxidized to sulfoxide, to sulfone, to sulfonate, and finally to sulfuric acid. In this case, the fuel value of the desulfurized compounds is largely retained. We are evaluating the potential of commercially available enzymes to perform this function.
Date:
March 23, 1990
Creator:
Boyer, Y.N.; Crooker, S.C.; Kitchell, J.P. & Nochur, S.V.
Object Type:
Report
System:
The UNT Digital Library
Characterization of DC-S-2000 silicone rubber as an O-ring material for laser amplifier systems
We evaluated mechanical, thermal, thermodynamic, and chemical properties of Dow Corning DC-S-2000, a silicone rubber filled with silica, that was selected as an O-ring material for SHIVA laser amplifiers. We compared the properties of a batch cured in-house with the manufacturer's specifications, and we developed specific quality-control tests to evaluate future production batches of this elastomer. We also examined mechanical and thermal transitions not described in the manufacturer's bulletin. Because the silicone O-rings must function under prolonged compression, we recommend an examination of the compression properties of DC-S-2000.
Date:
March 23, 1979
Creator:
Hoffman, D.M.
Object Type:
Report
System:
The UNT Digital Library
Pen Branch fault program: Consolidated report on the seismic reflection surveys and the shallow drilling
The Pen Branch fault was identified in the subsurface at the Savannah River Site (SRS) in 1989 based upon interpretation of earlier seismic reflection surveys and other geologic investigations (Seismorgraph Services Incorp., 1973; Chapman and DiStefano, 1989; Snipes, Fallaw and Price, 1989). A program was initiated at that time to determine the capability of the fault to release seismic energy (Price and others, 1989) as defined in the Nuclear Regulatory Commission regulatory guidelines, 10 CFR 100 Appendix A. This report presents the results of the Pen Branch fault investigation based on data acquired from seismic reflection surveys and shallow drilling across the fault completed at this time. The Earth Science Advisory Committee (ESAC) has reviewed the results of these investigations and unanimously agrees with the conclusion of Westinghouse Savannah River Company (WSRC) that the Pen Branch fault is a non-capable fault. ESAC is a committee of 12 earth science professionals from academia and industry with the charter of providing outside peer review of SRS geotechnical, seismic, and ground water modeling programs.
Date:
March 23, 1991
Creator:
Stieve, A. L.; Stephenson, D. E. & Aadland, R. K.
Object Type:
Report
System:
The UNT Digital Library
Design Studies on Cesium-137 as a Source for High Level Gamma Irradiators: Quarterly Progress Report Number 3, December 1959 - March 1960
Quarterly progress report describing work related to a study of radiation physics problems involved in the design of high-level cesium-137 gamma sources. It outlines work completed and ongoing goals for the project.
Date:
March 23, 1960
Creator:
Voyvodic, Louis
Object Type:
Report
System:
The UNT Digital Library
P-10 Chemical Equilibria
This report studies tritium oxides and tritium in water vapor, a product of P-10.
Date:
March 23, 1950
Creator:
Roesch, William C.
Object Type:
Report
System:
The UNT Digital Library
Bioconversion of plant biomass to ethanol. Annual report and revised research plan, January 1977--January 1978
The objective of this research is to demonstrate on a laboratory scale the technical feasibility of the direct microbial conversion of pretreated wood to ethanol. During the first year of this contract, we investigated the feasibility of biologically delignifying wood with C. pruinosum and directly fermenting the pretreated wood to ethanol with a mixed culture. Bench-top fermentations of a thermophilic bacillus growing on glucose and of a mixed culture of thermophilic sporocytophaga (US) and a thermophilic bacillus growing on microcrystalline and amorphous cellulose were evaluated for growth and ethanol production. In the mixed culture fermentation of amorphous and microcrystalline cellulose, the specific rate of substrate depletion was calculated to be 0.087 hr/sup -1/ and 0.0346 hr/sup -1/, respectively. However, defining the growth requirements of C. pruinosum and sporocytophaga (US) proved more difficult than originally anticipated. In order to achieve the program objectives within the contract period, a revised research plan was developed based upon chemical pretreatment and the direct fermentation of pretreated hardwood to ethanol. In place of the biological delignification pretreatment step, we have substituted a chemically supplemented steam pretreatment step to partially delignify wood and to enhance its accessibility to microbial utilization. Clostridium thermocellum, which ferments cellulose directly …
Date:
March 23, 1978
Creator:
Brooks, R.E.; Bellamy, W.D. & Su, T.M.
Object Type:
Report
System:
The UNT Digital Library
Development of enhanced sulfur rejection processes
Research at Virginia Tech led to two complementary concepts for improving the removal of inorganic sulfur from much of the Eastern US coals. One controls the surface properties of coal pyrite (FeS[sub 2]) by electrochemical-.potential control, referred to as the Electrochemically Enhanced Sulfur Rejection (EESR) Process: The second controls the flotation of middlings, i.e., particles composed of pyrite with coal inclusions by using polymeric reagents to react with pyrite and convert the middlings to hydrophilic particles, and is termed the Polymer Enhanced Sulfur Rejection (PESR) Process. These new concepts are based on recent research establishing the two main reasons why flotation fails to remove more than about 50% of the pyritic sulfur from coal: superficial oxidization of liberated pyrite to form polysulfide oxidation products so that a part of the liberated pyrite floats with the coal; and hydrophobic coal inclusions in the middlings dominating their flotation so that the middlings also float with the coal. These new pyritic-sulfur rejection processes do not require significant modifications of existing coal preparation facilities, enhancing their adoptability by the coal industry. It is believed that they can be used simultaneously to achieve both free pyrite and locked pyrite rejection.
Date:
March 23, 1993
Creator:
Yoon, R. H.; Luttrell, G.; Adel, G. & Richardson, P. E.
Object Type:
Report
System:
The UNT Digital Library
Criteria for the PNE seismic network. [On-site inspection against clandestine operations]
A 1976 treaty between the United States and the Soviet Union permits a local seismic network to be deployed at the site of a peaceful nuclear explosion to monitor the event. Criteria for the design and selection of the data-acquisition equipment for such a network are provided. Constraints imposed by the protocol of the treaty, the environment, and the expected properties of seismic signals (based on experiences at the Nevada Test Site) are discussed. Conclusions are drawn about the desired operating mode. Criteria for a general seismic instrumentation system are described.
Date:
March 23, 1978
Creator:
Pruvost, N.L. (comp.)
Object Type:
Report
System:
The UNT Digital Library