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130
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56
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33
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Degree Department
Country
States
Year
Month
Day
Texas Jewish Post (Fort Worth, Tex.), Vol. 52, No. 16, Ed. 1 Thursday, April 16, 1998
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 16, 1998
Creator:
Wisch, J. A. & Wisch, Rene
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 116, No. 58, Ed. 1 Thursday, July 16, 1998
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
July 16, 1998
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
San Antonio Register (San Antonio, Tex.), Vol. 66, No. 43, Ed. 1 Thursday, April 16, 1998
Weekly newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
April 16, 1998
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
San Antonio Register (San Antonio, Tex.), Vol. 67, No. 4, Ed. 1 Thursday, July 16, 1998
Weekly newspaper from San Antonio, Texas that includes local, state, and national news along with advertising.
Date:
July 16, 1998
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 16, Ed. 1 Thursday, April 16, 1998
Weekly newspaper from Archer City, Texas that includes local, state and national news along with advertising.
Date:
April 16, 1998
Creator:
Armstrong, Sonny
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 29, Ed. 1 Thursday, July 16, 1998
Weekly newspaper from Archer City, Texas that includes local, state and national news along with advertising.
Date:
July 16, 1998
Creator:
Armstrong, Sonny
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 116, No. 67, Ed. 1 Sunday, August 16, 1998
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
August 16, 1998
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 112, No. 29, Ed. 1 Thursday, July 16, 1998
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 16, 1998
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 112, No. 16, Ed. 1 Thursday, April 16, 1998
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
April 16, 1998
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
4-D conformal field theories and strings on orbifolds
None
Date:
March 16, 1998
Creator:
Kachru, Shamit & Silverstein, Eva
Object Type:
Article
System:
The UNT Digital Library
On vanishing two loop cosmological constants in nonsupersymmetric strings
It has recently been suggested that in certain special nonsupersymmetric type II string compactifications, at least the first two perturbative contributions to the cosmological constant {Lambda} vanish. Support for perturbative vanishing beyond 1-loop (as well as evidence for the absence of some nonperturbative contributions) has come from duality arguments. There was also a direct 2-loop computation which was incomplete; in this note we explain the deficiency of the previous 2-loop calculation and discuss the complete 2-loop computation in two different models. The corrected analysis yields a vanishing 2-loop contribution to {Lambda} in these models.
Date:
October 16, 1998
Creator:
Kachru, Shamit & Silverstein, Eva
Object Type:
Article
System:
The UNT Digital Library
ADVANCED SORBENT DEVELOPMENT PROGRAM
The overall objective of this program was to develop regenerable sorbents for use in the temperature range of 343 to 538 C (650 to 1000 F) to remove hydrogen sulfide (H{sub 2}S) from coal-derived fuel gases in a fluidized-bed reactor. The goal was to develop sorbents that are capable of reducing the H{sub 2}S level in the fuel gas to less than 20 ppmv in the specified temperature range and pressures in the range of 1 to 20 atmospheres, with chemical characteristics that permit cyclic regeneration over many cycles without a drastic loss of activity, as well as physical characteristics that are compatible with the fluidized bed application.
Date:
June 16, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Seismic evaluation of the U1a complex at the Nevada Test Site
As part of an overall safety evaluation of the Ula Complex, a seismic evaluation of structures, systems, and components (SSC) was conducted. A team of seismic, safety, and operation engineers from Los Alamos National Laboratory (LANL), Bechtel Nevada (BN) and Lawrence Livermore National Laboratory (LLNL) was chartered to perform the seismic evaluation. The UlA Complex is located in Area 1 of the Nevada Test Site (NTS) in Nevada. The complex is a test facility for physics experiments in support of the Science Based Stockpile Stewardship Program. The Ula Complex consists of surface and subsurface facilities. The subsurface facility is a tunnel complex located 963 feet below the surface. The seismic evaluation of U 1 a Complex is required to comply with the DOE Natural Phenomena Policy. This policy consists of an order, an implementing guide, and standards which provide guidance for design and evaluation of SSCs, categorization of SSCs, characterization of site, and hazard level definition.
Date:
October 16, 1998
Creator:
McCamant, R R; Davito, A M; Hahn, K R; Murray, R C; Ng, D S; Sahni, V K et al.
Object Type:
Report
System:
The UNT Digital Library
Texas Register, Volume 23, Number 3, Pages 397-472, January 16, 1998
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:
January 16, 1998
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Register, Volume 23, Number 42, Pages 10577-10751, October 16, 1998
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:
October 16, 1998
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
[News Clip: Tippett Obit]
Video footage from the NBC 5/KXAS station in Fort Worth, Texas, to accompany a news story about the death of NBC reporter and camera man Bill Tippett. This video served as a video obituary. This story was produced for the 6:00 P.M. news broadcast.
Date:
February 16, 1998
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Waste form development and characterization in pyrometallurgical treatment of spent nuclear fuel.
Electrometallurgical treatment is a compact, inexpensive method that is being developed at Argonne National Laboratory to deal with spent nuclear fuel, primarily metallic and oxide fuels. In this method, metallic nuclear fuel constituents are electrorefined in a molten salt to separate uranium from the rest of the spent fuel. Oxide and other fuels are subjected to appropriate head end steps to convert them to metallic form prior to electrorefining. The treatment process generates two kinds of high-level waste--a metallic and a ceramic waste. Isolation of these wastes has been developed as an integral part of the process. The wastes arise directly from the electrorefiner, and waste streams do not contain large quantities of solvent or other process fluids. Consequently, waste volumes are small and waste isolation processes can be compact and rapid. This paper briefly summarizes waste isolation processes then describes development and characterization of the two waste forms in more detail.
Date:
April 16, 1998
Creator:
Ackerman, J.
Object Type:
Article
System:
The UNT Digital Library
CNEA/ANL collaboration program to develop an optimized version of DART validation and assessment by means of U{sub 3}Si{sub x} and U{sub 3}O{sub 8-}Al dispersed CNEA miniplate irradiation behavior.
The DART code is based upon a thermomechanical model that can predict swelling, recrystallization, fuel-meat interdiffusion and other issues related with MTR dispersed FE behavior under irradiation. As a part of a common effort to develop an optimized version of DART, a comparison between DART predictions and CNEA miniplates irradiation experimental data was made. The irradiation took place during 1981-82 for U3O8 miniplates and 1985-86 for U{sub 3}Si{sub x} at Oak Ridge Research Reactor (ORR). The microphotographs were studied by means of IMAWIN 3.0 Image Analysis Code and different fission gas bubbles distributions were obtained. Also it was possible to find and identify different morphologic zones. In both kinds of fuels, different phases were recognized, like particle peripheral zones with evidence of Al-U reaction, internal recrystallized zones and bubbles. A very good agreement between code prediction and irradiation results was found. The few discrepancies are due to local, fabrication and irradiation uncertainties, as the presence of U{sub 3}Si phase in U{sub 3}Si{sub 2} particles and effective burnup.
Date:
October 16, 1998
Creator:
Solis, D.
Object Type:
Article
System:
The UNT Digital Library
Quarterly Technical Progress Report
The temperature dependence of the oxygen flux across the BaCe0G03 dense membrane (BCG membrane) tube was investigated. In the temperature range of 688C to 955C, the increase in the oxygen flux with temperature obeyed the Arrhenius law. An increase in the helium sweep flow membrane tube. rate in the tube side resulted in an increase in the oxygen flux through the The oxygen fluxes through the BCG dense membrane tube were measured at different oxygen partial pressures in the shell side. The oxygen flux increased with the oxygen partial pressure in the shell side. The BCG dense membrane was tested in a membrane reactor for the catalytic oxidative coupling of methane. The BCG membrane is not a complete combustion catalyst, and the catalytic activity of the BCG membrane was found to be much higher than the Argonne dense membrane. As the oxygen partial pressure in the shell side increased, the C2 decreased while the C2 yield remained unchanged, indicating that non-selective, reactions still played a significant role in the membrane reactor.
Date:
March 16, 1998
Creator:
Ma, Yi Hua
Object Type:
Report
System:
The UNT Digital Library
Structural analysis of a completely amorphous {sup 238}Pu-doped zircon by neutron diffraction.
The structure of a completely amorphous zircon was determined by time-of-flight neutron diffraction at Argonne's Intense Pulsed Neutron Source (IPNS). The sample of metamict zircon (ZrSiO{sub 4}),initially doped to 8.85 weight percent {sup 238}Pi, had been completely amorphized by alpha-recoil damage since its synthesis in 1981 at the Pacific Northwest National Laboratory (PNNL). The measured diffraction structure factor, S(Q), indicated a completely amorphous sample, with no signs of residual zircon microcrystallinity. The pair distribution function obtained indicated that the structure was that of an oxide glass, retaining the Si-0, Zr-0, and O-O bond lengths of crystalline zircon.
Date:
December 16, 1998
Creator:
Fortner, J. A.
Object Type:
Article
System:
The UNT Digital Library
Lifecycle-analysis for heavy vehicles.
Various alternative fuels and improved engine and vehicle systems have been proposed in order to reduce emissions and energy use associated with heavy vehicles (predominantly trucks). For example, oil companies have proposed improved methods for converting natural gas to zero-aromatics, zero-sulfur diesel fuel via the Fischer-Tropsch process. Major heavy-duty diesel engine companies are working on ways to simultaneously reduce particulate-matter and NOX emissions. The trend in heavy vehicles is toward use of lightweight materials, tires with lower rolling resistance, and treatments to reduce aerodynamic drag. In this paper, we compare the Mecycle energy use and emissions from trucks using selected alternatives, such as Fisher-Tropsch diesel fuel and advanced fuel-efficient engines. We consider heavy-duty, Class 8 tractor-semitrailer combinations for this analysis. The total life cycle includes production and recycling of the vehicle itself, extraction, processing, and transportation of the fuel itself, and vehicle operation and maintenance. Energy use is considered in toto, as well as those portions that are imported, domestic, and renewable. Emissions of interest include greenhouse gases and criteria pollutants. Angonne's Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET) model is used to generate per-vehicle fuel cycle impacts. Energy use and emissions for materials manufacturing and vehicle …
Date:
April 16, 1998
Creator:
Gaines, L.
Object Type:
Article
System:
The UNT Digital Library
Fuel-cycle greenhouse gas emissions impacts of alternative transportation fuels and advanced vehicle technologies.
At an international conference on global warming, held in Kyoto, Japan, in December 1997, the United States committed to reduce its greenhouse gas (GHG) emissions by 7% over its 1990 level by the year 2012. To help achieve that goal, transportation GHG emissions need to be reduced. Using Argonne's fuel-cycle model, I estimated GHG emissions reduction potentials of various near- and long-term transportation technologies. The estimated per-mile GHG emissions results show that alternative transportation fuels and advanced vehicle technologies can help significantly reduce transportation GHG emissions. Of the near-term technologies evaluated in this study, electric vehicles; hybrid electric vehicles; compression-ignition, direct-injection vehicles; and E85 flexible fuel vehicles can reduce fuel-cycle GHG emissions by more than 25%, on the fuel-cycle basis. Electric vehicles powered by electricity generated primarily from nuclear and renewable sources can reduce GHG emissions by 80%. Other alternative fuels, such as compressed natural gas and liquefied petroleum gas, offer limited, but positive, GHG emission reduction benefits. Among the long-term technologies evaluated in this study, conventional spark ignition and compression ignition engines powered by alternative fuels and gasoline- and diesel-powered advanced vehicles can reduce GHG emissions by 10% to 30%. Ethanol dedicated vehicles, electric vehicles, hybrid electric vehicles, and …
Date:
December 16, 1998
Creator:
Wang, M. Q.
Object Type:
Article
System:
The UNT Digital Library
Validation of Electrical-Impedance Tomography for Measurements of Material Distribution in Two-Phase Flows
A series of studies is presented in which an electrical-impedance tomography (EXT) system is validated for two-phase flow measurements. The EIT system, developed at Sandia National Laboratories, is described along with the computer algorithm used for reconstructing phase volume fraction profiles. The algorithm is first tested using numerical data and experimental phantom measurements, with good results. The EIT system is then applied to solid-liquid and gas-liquid flows, and results are compared to an established gamma-densitometry tomography (GDT) system. In the solid-liquid flows, the average solid volume fractions measured by EIT are in good agreement with nominal values; in the gas-liquid flows, average gas volume fractions and radial gas volume fraction profiles from GDT and EIT are also in good agreement.
Date:
October 16, 1998
Creator:
Ceccio, S. L.; George, D. L.; O'Hern, T. J.; Shollenberger, K. A. & Torczynski, J. R.
Object Type:
Article
System:
The UNT Digital Library
A comparison of the RELAP5/MOD3 and PARET/ANL codes with the experimental transient data from the SPERT-IV D-12/25 series.
The results from the RELAP5/MOD3 and PARET/ANL codes are compared with the SPERT-IV series of experimental reactivity insertion transients. The PARET/ANL code provides conservative estimates of SPERT-IV experimental data for the midrange transients and for the more severe transients. The PARET results are similar to the results obtained earlier for the SPERT-I D-12/25 series of experiments. The RELAP5/MOD3 code (including the developmental version 3.2.1.2) gives results comparable to PARET for some midrange transients, but seriously diverges from the experimental data when significant boiling is present. Based on the results of this study, the use of the RELAP5 code for research reactor applications should be limited to transients that do not generate substantial boiling and voids. We hope to be able to resolve these differences in further work with the NRC staff and its contractors. The RELAP5 code would be a more useful tool for the analyses research reactor transients with the addition of suitable correlations for low pressures and plate type geometry.
Date:
January 16, 1998
Creator:
Woodruff, W. L.
Object Type:
Article
System:
The UNT Digital Library