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Impact ionization in GaAs: A screened exchange density-functional approach

Description: Results are presented of a fully ab initio calculation of impact ionization rates in GaAs within the density functional theory framework, using a screened-exchange formalism and the highly precise all-electron full-potential linearized augmented plane wave method. The calculated impact ionization rates show a marked orientation dependence in k space, indicating the strong restrictions imposed by the conservation of energy and momentum. This anisotropy diminishes as the impacting electron energy… more
Date: August 13, 2001
Creator: Picozzi, S., Asahi, R., Geller, C.B., Continenza, A., and Freeman, A.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Accounting Data to Web Interface Using PERL

Description: This document will explain the process to create a web interface for the accounting information generated by the High Performance Storage Systems (HPSS) accounting report feature. The accounting report contains useful data but it is not easily accessed in a meaningful way. The accounting report is the only way to see summarized storage usage information. The first step is to take the accounting data, make it meaningful and store the modified data in persistent databases. The second step is to g… more
Date: August 13, 2001
Creator: Hargeaves, C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Shielding Calculations for the BDMS UF6 Mass Flow Meter

Description: We performed Monte Carlo calculations of the neutron and gamma ray spectra and neutron and gamma dose rates outside the shielding of the UF{sub 6} mass flowmeter. The UF{sub 6} mass flowmeter and the UF{sub 6} mass flowmeter are the two main components of the Blend Down Monitoring System (BDMS) equipment. The BDMS equipment is designed to continuously monitor the UF{sub 6} enrichment and mass flow rates in processing pipes at uranium facilities. The UF{sub 6} mass flowmeter incorporates four {s… more
Date: September 13, 2001
Creator: Radev, R & Hall, J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FY2002 Progress Summary Program Plan, Statement of Work and Deliverables for Development of High Average Power Diode-Pumped Solid State Lasers, and Complementary Technologies, for Applications in Energy and Defense

Description: The High Average Power Laser Program (HAPL) is a multi-institutional, coordinated effort to develop a high-energy, repetitively pulsed laser system for Inertial Fusion Energy and other DOE and DOD applications. This program is building a laser-fusion energy base to complement the laser-fusion science developed by DOE Defense programs over the past 25 years. The primary institutions responsible for overseeing and coordinating the research activities are the Naval Research Laboratory (NRL) and LL… more
Date: December 13, 2001
Creator: Bayramian, A.; Bibeau, C.; Beach, R.; Behrendt, B.; Ebbers, C.; Latkowski, J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Beam Simulations for IRE and Driver - Status and Strategy

Description: The methods and codes employed in the U.S. Heavy Ion Fusion program to simulate the beams in an Integrated Research Experiments (IRE) facility and a fusion driver are presented in overview. A new family of models incorporating accelerating module impedance, multi-beam, and self-magnetic effects is described, and initial WARP3d particle simulations of beams using these models are presented. Finally, plans for streamlining the machine-design simulation sequence, and for simulating beam dynamics f… more
Date: March 13, 2001
Creator: Friedman, A; Grote, D P & Lee, E P
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Visual Sample Plan Version 1.0 User's Guide

Description: This user's guide describes Visual Sample Plan (VSP) Version 1.0 and provides instructions for using the software. VSP selects the appropriate number and location of environmental samples to ensure that the results of statistical tests performed to provide input to environmental decisions have the required confidence and performance. VSP Version 1.0 provides sample-size equations or algorithms needed by specific statistical tests appropriate for specific environmental sampling objectives. The e… more
Date: April 13, 2001
Creator: Davidson, James R.; Hassig, Nancy L.; Wilson, John E. & Gilbert, Richard O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nucleic Acid-Based Detection and Identification of Bacterial and Fungal Plant Pathogens - Final Report

Description: The threat to American interests from terrorists is not limited to attacks against humans. Terrorists might seek to inflict damage to the U.S. economy by attacking our agricultural sector. Infection of commodity crops by bacterial or fungal crop pathogens could adversely impact U.S. agriculture, either directly from damage to crops or indirectly from damage to our ability to export crops suspected of contamination. Recognizing a terrorist attack against U.S. agriculture, to be able to prosecute… more
Date: March 13, 2001
Creator: Kingsley, Mark T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High-Level Waste Melter Study Report

Description: At the Hanford Site in Richland, Washington, the path to site cleanup involves vitrification of the majority of the wastes that currently reside in large underground tanks. A Joule-heated glass melter is the equipment of choice for vitrifying the high-level fraction of these wastes. Even though this technology has general national and international acceptance, opportunities may exist to improve or change the technology to reduce the enormous cost of accomplishing the mission of site cleanup. Co… more
Date: July 13, 2001
Creator: Perez, Joseph M.; Bickford, Dennis F.; Day, Delbert E.; Kim, Dong-Sang; Lambert, Steven L.; Marra, Sharon L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Engineered Barrier Systems Thermal-Hydraulic-Chemical Column Test Report

Description: The Engineered Barrier System (EBS) Thermal-Hydraulic-Chemical (THC) Column Tests provide data needed for model validation. The EBS Degradation, Flow, and Transport Process Modeling Report (PMR) will be based on supporting models for in-drift THC coupled processes, and the in-drift physical and chemical environment. These models describe the complex chemical interaction of EBS materials, including granular materials, with the thermal and hydrologic conditions that will be present in the reposit… more
Date: December 13, 2001
Creator: Lowry, W. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Transverse Beam Profile Measurement Using Scrape Scans

Description: A scraper scan - sending a scraper through a particle beam while measuring the intensity as a function of scraper position - is a common method of determining the profile of the beam. At first glance, this seems to be a rather simple procedure. Nevertheless, some care is required in the acquisition of the data and in the analysis if one is going to achieve an accurate result.
Date: September 13, 2001
Creator: Werkema, Steven J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NEOS server 4.0 administrative guide.

Description: The NEOS Server 4.0 provides a general Internet-based client/server as a link between users and software applications. The administrative guide covers the fundamental principals behind the operation of the NEOS Server, installation and trouble-shooting of the Server software, and implementation details of potential interest to a NEOS Server administrator. The guide also discusses making new software applications available through the Server, including areas of concern to remote solver administr… more
Date: July 13, 2001
Creator: Dolan, E. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ENHANCEMENT OF EQUILIBRIUMSHIFT IN DEHYDROGENATION REACTIONS USING A NOVEL MEMBRANE REACTOR

Description: With the advances in new inorganic materials and processing techniques, there has been renewed interest in exploiting the benefits of membranes in many industrial applications. Inorganic and composite membranes are being considered as potential candidates for use in membrane-reactor configuration for effectively increasing reaction rate, selectivity and yield of equilibrium limited reactions. To investigate the usefulness of a palladium-ceramic composite membrane in a membrane reactor-separator… more
Date: February 13, 2001
Creator: Ilias, Shamsuddin & King, Franklin G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Proceedings of the 2nd Annual Tank Integrity Workshop

Description: The production of nuclear weapons in the United States to help defeat the Axis Powers in World War II and to maintain national security during the Cold War required the construction of a vast nuclear facility complex in the 1940's and 1950's. These facilities housed nuclear reactors needed for the production of plutonium and chemical plants required to separate the plutonium from fission products and to convert plutonium compounds to pure plutonium metal needed for weapons. The chemical separat… more
Date: November 13, 2001
Creator: Edelson, M. C. & Thompson, R. Bruce
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

''Yields of Radionuclides Created by Photonuclear Reactions on Be, C, Na, C1, and Ge, Using Bremsstrahlung of 150-MeV Electrons''

Description: The bremsstrahlung created by 150-MeV electrons impinging on a tantalum radiator was used to study photonuclear reactions on samples containing Be, C, Na, Cl and Ge. For Ge fifteen radioisotopes, ranging in half life between 2.6 min and 271 days, and in mass between 65 and 75, were obtained in sufficient amount to determine their yields quantitatively using known decay gamma-rays. Special equipment is described which was developed to create the bremsstrahlung using a beam-sharing mode, while mi… more
Date: December 13, 2001
Creator: Dickens, J.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Studies of Particulates and Structural Transformations in Glass Using Synchrotron Radiation. Final Technical Report

Description: The initial study on nanoparticles of magnetite was carried out in an epoxy matrix. The formation of agglomerates of Fe3O4 nanoparticles was studied by mu-XRF, magnetic, TEM and SEM techniques. Because of the elevated viscosity of epoxy resin and its effect on particle agglomeration, this study was extended using less viscous polyvinyl alcohol and some sol gels as a matrix. Unlike the results found in epoxy resin, spherical agglomerates were found in a PVA matrix even at Fe3O4 concentration of … more
Date: April 13, 2001
Creator: Thorpe, Arthur
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY

Description: The Pennsylvania State University, under contract to the U.S. Department of Energy, National Energy Technology Laboratory is performing a feasibility analysis on installing a state-of-the-art circulating fluidized bed boiler and ceramic filter emission control device at Penn State's University Park campus for cofiring multiple biofuels and other wastes with coal, and developing a test program to evaluate cofiring multiple biofuels and coal-based feedstocks. The objective of the project is being… more
Date: July 13, 2001
Creator: Miller, Bruce G.; Miller, Sharon Falcone; Cooper, Robert; Donovan, Douglas; Gaudlip, John; Lapinsky, Matthew et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Subsurface Flow and Free-water Surface Wetlands Treating NPR-3 Produced Water - Year No. 1

Description: This paper is a summary of some of the activities conducted during the first year of a three-year cooperative research and development agreement (CRADA) between the Department of Energy (DOE) Rocky Mountain Oilfield Testing Center (RMOTC) and Texaco relating to the treatment of produced water by constructed wetlands. The first year of the CRADA is for design, construction and acclimation of the wetland pilot units. The second and third years of the CRADA are for tracking performance of pilot we… more
Date: October 13, 2001
Creator: Myers, J. E. & Jackson, L. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparision of Limit Load Solutions with Results of a Collapse Tests of Perforated Plates with a Triangular Penetration Pattern

Description: Limit load solutions obtained by elastic-perfectly plastic finite element analysis (EPP-FEA) are compared to results of tests of low-alloy steel perforated plate geometries loaded to full plastic collapse. Results are given for two plastic-collapse tests of flat circular disks with circular penetrations arranged in a triangular pattern and drilled normal to the surface of the plate. The ligament efficiency (minimum distance between holes divided by the distance between the centers of the holes)… more
Date: December 13, 2001
Creator: Jones, D.P. & Gordon, J.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

C{sub 2}D{sub 5}I dissociation and D + CH{sub 3} {yields} CH{sub 2}D + H at high temperature : implications to the high pressure rate constant for CH{sub 4} dissociation.

Description: The shock tube technique with H- and D-atom atomic resonance absorption spectrometry (ARAS) detection has been used to study the thermal decomposition of C{sub 2}D{sub 5}I and the reaction, CH{sub 3} + D'' CH{sub 2}D + H, (1) over the temperature ranges, 924-1370 K and 1294-1753 K, respectively. First-order rate constants for the thermal decomposition of C{sub 2}D{sub 5}I can be expressed by the Arrhenius equation, logk{sub C2D5I} = (10.397 {+-} 0.297) - (7700 {+-} 334 K)/T, giving k{sub C2D5I}… more
Date: December 13, 2001
Creator: Su, M.-C. & Michael, J. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reimplementing the EPICS static database access library.

Description: The Static Database Access library was first introduced in EPICS (Experimental Physics and Industrial Control System) Release 3.11 in 1994. It provides an application program interface (API) for database configuration tools written in C to manipulate database record definitions and is used for various tasks within the core EPICS software. This paper describes the structure of a replacement for the original library that adds a native C++ API and will make some future enhancements to EPICS signif… more
Date: November 13, 2001
Creator: Johnson, A. N. & Kraimer, M. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Radio AGN Surveys

Description: We present a short overview of radio surveys for AGN, including the ''complete'' flux limited surveys and ''filtered'' surveys. We also describe our ultra-steep spectrum search for the highest redshift radio galaxies, and our follow-up VLA and ATCA observations of the most distant (z = 5.19) and the most luminous z < 2 radio galaxy known.
Date: November 13, 2001
Creator: De Breuck, C.; van Breugel, W.; Rottgering, H. & Carilli, C. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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