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AN APPROACH TO EXTREME-SCALE SIMULATION OF NOVEL ARCHITECTURES
None
Date:
July 1, 2001
Creator:
ALEXANDER, F. J.; BERKBIGLER, K. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
NOVEL GAS CLEANING/CONDITIONING FOR INTEGRATED GASIFICATION COMBINED CYCLE
The objective of this program is to develop and evaluate novel sorbents for the Siemens Westinghouse Power Company's (SWPC's) ''Ultra-Clean Gas Cleaning Process'' for reducing to near-zero levels the sulfur- and chlorine-containing gas emissions and fine particulate matter (PM2.5) caused by fuel bound constituents found in carbonaceous materials, which are processed in Integrated Gasification Combined Cycle (IGCC) technologies.
Date:
July 1, 2001
Creator:
Abbasian, Javad
Object Type:
Report
System:
The UNT Digital Library
A New Dynamical Diffraction-Based Technique of the Residual Stress Measurements in Thin Films
The recently discovered dynamical diffraction effect ''neutron camel'' was used for the residual stress measurements in a thick Si(111) crystal coated with a 2000 {angstrom} thick Ni film. The observed asymmetry of the back-face rocking curve corresponds to the bending radius of {approx} 19 km and the tension force applied to the Ni film is {approx} 90 N/m. Relative deformation of the Si crystallographic cells in the vicinity of diffractive surfaces is |{partial_derivative}u{sub z}/{partial_derivative}z| {approx} 1.6 x 10{sup -6}.
Date:
July 26, 2001
Creator:
Agamalian, M.
Object Type:
Article
System:
The UNT Digital Library
Radiative effects in scattering of polarized leptons by polarized nucleons and light nuclei
Recent developments in the field of radiative effects in polarized lepton-nuclear scattering are reviewed. The processes of inclusive, semi-inclusive, diffractive and elastic scattering are considered. The explicit formulae obtained within the covariant approach are discussed. FORTRAN codes POLRAD, RADGEN, HAPRAD, DIFFRAD and MASCARAD created on the basis of the formulae are briefly described. Applications for data analysis of the current experiments on lepton-nuclear scattering at CERN, DESY, SLAC and TJNAF are illustrated by numerical results.
Date:
July 1, 2001
Creator:
Akushevich, Igor; Ilyichev, A. & Shumeiko, N.
Object Type:
Article
System:
The UNT Digital Library
ADVANCED DIAGNOSTIC TECHNIQUES FOR THREE-PHASE SLURRY BUBBLE COLUMN REACTORS (SBCR)
This report summarizes the accomplishment made during the second year of this cooperative research effort between Washington University, Ohio State University and Air Products and Chemicals. The technical difficulties that were encountered in implementing Computer Automated Radioactive Particle Tracking (CARPT) in high pressure SBCR have been successfully resolved. New strategies for data acquisition and calibration procedure have been implemented. These have been performed as a part of other projects supported by Industrial Consortium and DOE via contract DE-2295PC95051 which are executed in parallel with this grant. CARPT and Computed Tomography (CT) experiments have been performed using air-water-glass beads in 6 inch high pressure stainless steel slurry bubble column reactor at selected conditions. Data processing of this work is in progress. The overall gas holdup and the hydrodynamic parameters are measured by Laser Doppler Anemometry (LDA) in 2 inch slurry bubble column using Norpar 15 that mimic at room temperature the Fischer Tropsch wax at FT reaction conditions of high pressure and temperature. To improve the design and scale-up of bubble column, new correlations have been developed to predict the radial gas holdup and the time averaged axial liquid recirculation velocity profiles in bubble columns.
Date:
July 25, 2001
Creator:
Al-Dahhan, M.H.; Dudukovic, M.P. & Fan, L.S.
Object Type:
Report
System:
The UNT Digital Library
Aluminum-Oxide Temperatures on the Mark VB, VE, VR, 15, and Mark 25 Assemblies
The task was to compute the maximum aluminum-oxide and oxide-coolant temperatures of assemblies cladded in 99 plus percent aluminum. The assemblies considered were the Mark VB, VE, V5, 15 and 25. These assemblies consist of nested slug columns with individual uranium slugs cladded in aluminum cans. The CREDIT code was modified to calculate the oxide film thickness and the aluminum-oxide temperature at each axial increment. The information in this report will be used to evaluate the potential for cladding corrosion of the Mark 25 assembly.
Date:
July 17, 2001
Creator:
Aleman, S. E.
Object Type:
Report
System:
The UNT Digital Library
Aluminum-Oxide Temperatures on the Mark VB, VE, VR, 15, and Mark 25 Assemblies
The task was to compute the maximum aluminum-oxide and oxide-coolant temperatures of assemblies cladded in 99+ percent aluminum. The assemblies considered were the Mark VB, VE, V5, 15 and 25. These assemblies consist of nested slug columns with individual uranium slugs cladded in aluminum cans. The CREDIT code was modified to calculate the oxide film thickness and the aluminum-oxide temperature at each axial increment. This information in this report will be used to evaluate the potential for cladding corrosion of the Mark 25 assembly.
Date:
July 17, 2001
Creator:
Aleman, S. E.
Object Type:
Report
System:
The UNT Digital Library
Beam loss and collimation in the Fermilab 16 GeV proton driver
A high beam power of 1.15 MW in the proposed 16-GeV Proton Driver [1] implies serious constraints on beam losses in the machine. The main concerns are the hands-on maintenance and ground-water activation. Only with a very efficient beam collimation system can one reduce uncontrolled beam losses to an allowable level. The results on tolerable beam loss and on a proposed beam collimation system are summarized in this paper. A multi-turn particle tracking in the accelerator defined by all lattice components with their realistic strengths and aperture restrictions, and halo interactions with the collimators is done with the STRUCT code [2]. Full-scale Monte Carlo hadronic and electromagnetic shower simulations in the lattice elements, shielding, tunnel and surrounding dirt with realistic geometry, materials and magnetic field are done with the MARS14 code [3]. It is shown that the proposed 3-stage collimation system, allows localization of more than 99% of beamloss in a special straight section. Beam loss in the rest of the accelerator is 0.2 W/m on average.
Date:
July 20, 2001
Creator:
Alexandr I. Drozhdin, Oleg E. Krivosheev and Nikolai V. Mokhov
Object Type:
Article
System:
The UNT Digital Library
Overview of DYMCAS, the Y-12 Material Control And Accountability System
This paper gives an overview of DYMCAS, the material control and accountability information system for the Y-12 National Security Complex. A common misconception, even within the DOE community, understates the nature and complexity of material control and accountability (MC and A) systems, likening them to parcel delivery systems tracking packages at various locations or banking systems that account for money, down to the penny. A major point set forth in this paper is that MC and A systems such as DYMCAS can be and often are very complex. Given accountability reporting requirements and the critical and sensitive nature of the task, no MC and A system can be simple. The complexity of site-level accountability systems, however, varies dramatically depending on the amounts, kinds, and forms of nuclear materials and the kinds of processing performed at the site. Some accountability systems are tailored to unique and highly complex site-level materials and material processing and, consequently, are highly complex systems. Sites with less complexity require less complex accountability systems, and where processes and practices are the same or similar, sites on the mid-to-low end of the complexity scale can effectively utilize a standard accountability system. In addition to being complex, a unique …
Date:
July 1, 2001
Creator:
Alspaugh, D. H.
Object Type:
Article
System:
The UNT Digital Library
Black Members of the United States Congress: 1789-2001
Thirty-nine black Members serve in the 107th Congress, all in the House of Representatives. In 210 years of congressional history, there have been 107 black Members of Congress: 103 elected to the House and four to the Senate. This report includes alphabetical listing of black members, selected biographical information, and committee assignments during their tenure in office.
Date:
July 12, 2001
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Reservoir Characterization of Upper Devonian Gordon Sandstone, Jacksonburg Stringtown Oil Field, Northwestern West Virginia
The Jacksonburg-Stringtown oil field contained an estimated 88,500,000 barrels of oil in place, of which approximately 20,000,000 barrels were produced during primary recovery operations. A gas injection project, initiated in 1934, and a pilot waterflood, begun in 1981, yielded additional production from limited portions of the field. The pilot was successful enough to warrant development of a full-scale waterflood in 1990, involving approximately 8,900 acres in three units, with a target of 1,500 barrels of oil per acre recovery. Historical patterns of drilling and development within the field suggests that the Gordon reservoir is heterogeneous, and that detailed reservoir characterization is necessary for understanding well performance and addressing problems observed by the operators. The purpose of this work is to establish relationships among permeability, geophysical and other data by integrating geologic, geophysical and engineering data into an interdisciplinary quantification of reservoir heterogeneity as it relates to production. Conventional stratigraphic correlation and core description shows that the Gordon sandstone is composed of three parasequences, formed along the Late Devonian shoreline of the Appalachian Basin. The parasequences comprise five lithofacies, of which one includes reservoir sandstones. Pay sandstones were found to have permeabilities in core ranging from 10 to 200 mD, whereas …
Date:
July 1, 2001
Creator:
Ameri, S.; Aminian, K.; Avary, K. L.; Bilgesu, H. I.; Hohn, M. E.; McDowell, R. R. et al.
Object Type:
Report
System:
The UNT Digital Library
Ultrathin diamond-like carbon films deposited by filtered carbon vacuum arcs
Ultrathin (< 5 nm) hard carbon films are of great interest to the magnetic storage industry as the areal density approaches 100 Gbit/in{sup 2}. These films are used as overcoats to protect the magnetic layers on disk media and the active elements of the read-write slider. Tetrahedral amorphous carbon films can be produced by filtered cathodic arc deposition, but the films will only be accepted by the storage industry only if the ''macroparticle'' issue has been solved. Better plasma filters have been developed over recent years. Emphasis is put on the promising twist filter system - a compact, open structure that operates with pulsed arcs and high magnetic field. Based on corrosion tests it is shown that the macroparticle reduction by the twist filter is satisfactory for this demanding application, while plasma throughput is very high. Ultrathin hard carbon films have been synthesized using S-filter and twist filter systems. Film properties such as hardness, elastic modulus, wear, and corrosion resistance have been tested.
Date:
July 13, 2001
Creator:
Anders, Andre; Fong, Walton; Kulkarni, Ashok; Ryan, Francis W. & Bhatia, C. Singh
Object Type:
Article
System:
The UNT Digital Library
Processing of CuInSe2-Based Solar Cells: Characterization of Deposition Processes in Terms of Chemical Reaction Analyses. Final Report, 6 May 1995 - 31 December 1998
This project describes a novel rotating-disc reactor has been designed and built to enable modulated flux deposition of CuInSe2 and its related binary compounds. The reactor incorporates both a thermally activated source and a novel plasma-activated source of selenium vapor, which have been used for the growth of epitaxial and polycrystalline thin-film layers of CuInSe2. A comparison of the different selenium reactant sources has shown evidence of increases in its incorporation when using the plasma source, but no measurable change when the thermally activated source was used. We concluded that the chemical reactivity of selenium vapor from the plasma source is significantly greater than that provided by the other sources studied. Epitaxially grown CuInSe2 layers on GaAs, ZnTe, and SrF2 demonstrate the importance of nucleation effects on the morphology and crystallographic structure of the resulting materials. These studies have resulted in the first reported growth of the CuAu type-I crystallographic polytype of CuInSe2, and the first reported epitaxial growth of CuInSe2 on ZnTe. Polycrystalline binary (Cu,Se) and (In,Se) thin films have been grown, and the molar flux ratio of selenium to metals was varied. It is shown that all of the reported binary compounds in each of the corresponding binary …
Date:
July 16, 2001
Creator:
Anderson, T. J. & Stanbery, B. J.
Object Type:
Report
System:
The UNT Digital Library
Temperature management of centrifugal contactor for caustic-side solvent extraction of cesium from tank waste.
A 32-stage centrifugal contactor underwent proof-of-concept testing for its potential use in caustic-side solvent extraction for removal of cesium from radioactive waste now stored in underground tanks at the Savannah River Site. This contactor met the performance goals. Maintaining this performance, however, depends on adequate temperature management. Subsequent calculations and measurements determined the effect of several sources of heat on the temperature of the liquid inside the contactor stages: heats of solvation and dilution, heat generated by the rotor in the mixing zone, and heat from the motor used to spin the rotor. The results indicated that over 90% of the heat comes from the motors, generating 12 W of thermal energy per stage. It was concluded that satisfactory temperature management of the contactor should be achievable by cooling the extraction section to remove 12 W of heat per stage.
Date:
July 9, 2001
Creator:
Arafat, H. A. & Leonard, R. A.
Object Type:
Report
System:
The UNT Digital Library
Assessing the Efficiency of US Electricity Markets
None
Date:
July 1, 2001
Creator:
Arciniegas, Ismael E.; Barrett, Chris & Marathe, Achla
Object Type:
Article
System:
The UNT Digital Library
Environmental Monitoring at the Savannah River Plant, Annual Report - 1973
This report summarizes results obtained from the environmental monitoring program at the Savannah River Plant during 1973. A brief discussion of plant releases to the environment and radioactivity detected in the environment is presented in the text and tables. The appendix contains tables of results from environmental sample analyses, sensitivities of laboratory analyses, and maps of sampling locations.
Date:
July 26, 2001
Creator:
Ashley, C.
Object Type:
Report
System:
The UNT Digital Library
Environmental Monitoring at the Savannah River Plant, Annual Report - 1981
An environmental monitoring program has been in existence at SRP since 1951. The original preoperational surveys have evolved into an extensive environmental monitoring program in which sample types from approximately 500 locations are analyzed for radiological and/or nonradiological parameters. The results of these analyses for 1981 are presented in this report.
Date:
July 26, 2001
Creator:
Ashley, C.
Object Type:
Report
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, July 2001.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
July 23, 2001
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, June 2001.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
July 10, 2001
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
FACTORIZATION OF SIMULATIONS
None
Date:
July 1, 2001
Creator:
BARRETT, C. L.; MORTVEIT, H. S. & REIDYS, C. M.
Object Type:
Article
System:
The UNT Digital Library
Characterization of the Air Source and the Plume Source at FLAME
None
Date:
July 1, 2001
Creator:
BLANCHAT,THOMAS K.
Object Type:
Report
System:
The UNT Digital Library
Implications of the Tevatron jet results on PDF
We report a new measurement of the pseudorapidity ({eta}) and transverse-energy (E{sub T}) dependence of the inclusive jet production cross section in p{bar p} collisions at {radical}s = 1:8 TeV using 95 pb{sup {minus}1} of data collected with the D0 detector at the Fermilab Tevatron. The differential cross section d{sup 2}{sigma}/(dE{sub T}d{eta}) is presented up to {vert_bar}{eta}{vert_bar} = 3, significantly extending previous measurements. The results are in good overall agreement with next-to-leading order predictions from QCD, indicate a preference for certain parton distribution functions, and provide the world's best constraint on the gluon distribution at high parton momentum fraction x.
Date:
July 3, 2001
Creator:
Babukhadia, Levan
Object Type:
Article
System:
The UNT Digital Library
The American Way to the Kyoto Protocol: an Economic Analysis to Reduce Carbon Pollution. A Study for World Wildlife Fund
This report presents a study of policies and measures that could dramatically reduce US greenhouse gas emissions over the next two decades. It examines a broad set of national policies to increase energy efficiency, accelerate the adoption of renewable energy technologies, and shift energy use to less carbon-intensive fuels. The policies address major areas of energy use in residential and commercial buildings, industrial facilities, transportation, and power generation.
Date:
July 2001
Creator:
Bailie, Alison; Bernow, Stephen; Dougherty, William; Lazarus, Michael & Kartha, Sivan
Object Type:
Text
System:
The UNT Digital Library
Exploring ARAC Support of U.S. Coast Guard Planning and Response Capability
The U.S. Coast Guard is responsible for the protection of the marine environment from spills of oil and hazardous material. The USCG responsibilities include responding to oil and chemical spills from ships as well as from sources ashore. While responding to a spill, The USCG Marine Safety Offices and Detachments, and the National Strike Force (NSF) depend on interagency support from the Environmental Protection Agency (EPA), National Oceanic and Atmospheric Administration (NOAA), and state and local agencies. Currently, the USCG depends on NOAA Scientific Support Coordinators for predicting and assessing atmospheric releases of hazardous material. NOAA has several computer models that the Coast Guard can access in the event of a chemical release into the atmosphere or an in situ oil burn. However, the Department of Energy operates a more powerful modeling system called the Atmospheric Release Advisory Capability (ARAC). Located at the Lawrence Livermore National Laboratory in Livermore, California, ARAC offers a complex multiscale model in a system that is simple for the end user to operate. The applicability of ARAC to Coast Guard operations is the subject of this study.
Date:
July 1, 2001
Creator:
Baker, M. S.; Baskett, R. & Ellis, J. S.
Object Type:
Report
System:
The UNT Digital Library