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Beam Tools for Geant4 (User's Guide)

Description: Geant4 is a tool kit developed by a collaboration of physicists and computer professionals in the high energy physics field for simulation of the passage of particles through matter. The motivation for the development of the Beam Tools is to extend the Geant4 applications to accelerator physics. The Beam Tools are a set of C++ classes designed to facilitate the simulation of accelerator elements: r.f. cavities, magnets, absorbers, etc. These elements are constructed from Geant4 solid volumes li… more
Date: December 2, 2002
Creator: V.Daniel Elvira, Paul Lebrun and Panagiotis Spentzouris
Partner: UNT Libraries Government Documents Department
open access

Final report for Grant No. DOE/DE-FG02-98ER14909: Experimental and modeling studies of nanometer aerosol filtration

Description: The primary objective is to perform a fundamental study of filtration of nanoparticles, and to obtain filtration knowledge necessary to design particle collection devices/systems for nanoparticle processing and for preventing nanoparticle emissions into the environment. The research covered a wide area relevant to nanoparticle filtration, under these main topics: (1) nanoparticle filtration and molecular dynamics simulation, (2) nanoparticle virtual impactor, (3) particle transport under low pr… more
Date: December 10, 2002
Creator: Pui, David Y. H. & Chen, Da-Ren
Partner: UNT Libraries Government Documents Department
open access

Final report: FASEB Summer Research Conference on ''Post-transcriptional control of gene expression: Effectors of mRNA decay'' [agenda and attendees list]

Description: The goal of this meeting was to provide an interactive forum for scientists working on prokaryotic and eukaryotic mRNA decay. A special seminar presented by a leader in the field of mRNA decay in S. cerevisiae focused on what is known and what needs to be determined, not only for yeast but for other organisms. The large attendance (110 participants) reflects the awareness that mRNA decay is a key player in gene regulation in a way that is affected by the many steps that precede mRNA formation. … more
Date: December 1, 2002
Creator: Maquat, Lynne
Partner: UNT Libraries Government Documents Department
open access

STREAM II-V4: Revision for STREAM II-V3 to Allow Mouse-Driven Selection of Release Location from a Graphical User Interface

Description: STREAM II-V3 is an aqueous transport module of the Savannah River Site emergency response Weather INformation Display (WIND) system. Stream II-V3 predicts peak concentration and peak concentration arrival time at downstream locations for releases from the SRS facilities to the Savannah River. Fifteen pre-determined potential release locations from SRS facilities were built into the current STREAM II-V3 model. Therefore, STREAM II-V3 can not be used for situations in which release locations diff… more
Date: December 18, 2002
Creator: Chen, K.F.
Partner: UNT Libraries Government Documents Department
open access

Reductive immobilization of U(VI) in Fe(III) oxide-reducing subsurface sediments: Analysis of coupled microbial-geochemical processes in experimental reactive transport systems

Description: Although the fundamental microbiological and geochemical processes underlying the potential use of dissimilatory metal-reducing bacteria (DMRB) to create subsurface redox barriers for immobilization of uranium and other redox-sensitive metal/radionuclide contaminants are well-understood (Lovley et al., 1991; Gorby and Lovley, 1992; Lovley and Phillips, 1992; Lovley, 1995; Fredrickson et al., 2000; Wielinga et al., 2000; Wielinga et al., 2001), several fundamental scientific questions need to be… more
Date: December 6, 2002
Creator: Roden, Eric E.; Urrutia, Matilde M.; Barnett, Mark O. & Lange, Clifford r.
Partner: UNT Libraries Government Documents Department
open access

DUAL PHASE MEMBRANE FOR HIGH TEMPERATURE CO2 SEPARATION

Description: This project is aimed at synthesis of a new inorganic dual-phase carbonate membrane for high temperature CO{sub 2} separation. Metal-carbonate dual-phase membranes were prepared by the direct infiltration method and the synthesis conditions were optimized. The dual-phase membranes are gas-tight with helium permeance about six orders of magnitude lower than that for the metal support. Efforts were made to test seals for permeation and separation experiments for dual-phase membrane at the interme… more
Date: December 1, 2002
Creator: Lin, Jerry Y.S.
Partner: UNT Libraries Government Documents Department
open access

Development of OTM Syngas Process and Testing of Syngas Derived Ultra-clean Fuels in Diesel Engines and Fuel Cells

Description: This topical report summarizes work accomplished for the Program from November 1, 2001 to December 31, 2002 in the following task areas: Task 1: Materials Development; Task 2: Composite Development; Task 4: Reactor Design and Process Optimization; Task 8: Fuels and Engine Testing; 8.1 International Diesel Engine Program; 8.2 Nuvera Fuel Cell Program; and Task 10: Program Management. Major progress has been made towards developing high temperature, high performance, robust, oxygen transport elem… more
Date: December 31, 2002
Creator: Robinson, E. T.; Meagher, James P.; Apte, Prasad; Gui, Xingun; Bulicz, Tytus R.; Aasland, Siv et al.
Partner: UNT Libraries Government Documents Department
open access

Deep-Burn Modular Helium Reactor Fuel Development Plan

Description: This document contains the workscope, schedule and cost for the technology development tasks needed to satisfy the fuel and fission product transport Design Data Needs (DDNs) for the Gas Turbine-Modular Helium Reactor (GT-MHR), operating in its role of transmuting transuranic (TRU) nuclides in spent fuel discharged from commercial light-water reactors (LWRs). In its application for transmutation, the GT-MHR is referred to as the Deep-Burn MHR (DB-MHR). This Fuel Development Plan (FDP) describes… more
Date: December 2, 2002
Creator: McEachern, D
Partner: UNT Libraries Government Documents Department
open access

Assessment of Reactivity Margins and Loading Curves for PWR Burnup Credit Cask Designs

Description: This report presents studies to assess reactivity margins and loading curves for pressurized water reactor (PWR) burnup-credit criticality safety evaluations. The studies are based on a generic high-density 32-assembly cask and systematically vary individual calculational (depletion and criticality) assumptions to demonstrate the impact on the predicted effective neutron multiplication factor, k{sub eff}, and burnup-credit loading curves. The purpose of this report is to provide a greater under… more
Date: December 17, 2002
Creator: Wagner, J. C.
Partner: UNT Libraries Government Documents Department
open access

Low-Temperature, Vacuum-Aided Thermal Desorption Studies on a Simulated Organic Sludge Waste

Description: This report describes an initial set of small scale lab tests conducted on surrogate waste materials to investigate mass release behavior of volatile organics (VOC’s) from a solidified liquid organic sludge matrix under vacuumaided, low-temperature thermal desorption conditions. Low temperature thermal desorption is being considered as a potential processing technology alternative to incineration, to remove gas generation limitations affecting the transportation of transuranic (TRU) contaminate… more
Date: December 1, 2002
Creator: Farnsworth, R. K.; Peterman, D. R.; Anderson, Gary L. & Garn, T. G.
Partner: UNT Libraries Government Documents Department
open access

Theory and Simulation of the Physics of Space Charge Dominated Beams

Description: This report describes modeling of intense electron and ion beams in the space charge dominated regime. Space charge collective modes play an important role in the transport of intense beams over long distances. These modes were first observed in particle-in-cell simulations. The work presented here is closely tied to the University of Maryland Electron Ring (UMER) experiment and has application to accelerators for heavy ion beam fusion.
Date: December 9, 2002
Creator: Haber, Irving
Partner: UNT Libraries Government Documents Department
open access

Power Systems Development Facility Gasification Test Run TC10

Description: This report discusses Test Campaign TC10 of the Kellogg Brown & Root, Inc. (KBR) Transport Gasifier train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Gasifier is an advanced circulating fluidized-bed gasifier designed to operate as either a combustor or a gasifier in air- or oxygen-blown mode of operation using a particulate control device (PCD). The Tr… more
Date: December 30, 2002
Creator: Southern Company Services
Partner: UNT Libraries Government Documents Department
open access

Estimating Field-Scale Hydraulic Parameters of Heterogeneous Soils Using A Combination of Parameter Scaling and Inverse Methods

Description: As the Hanford Site transitions into remediation of contaminated soil waste sites and tank farm closure, more information is needed about the transport of contaminants as they move through the vadose zone to the underlying water table. The hydraulic properties must be characterized for accurate simulation of flow and transport. This characterization includes the determination of soil texture types, their three-dimensional distribution, and the parameterization of each soil texture. This documen… more
Date: December 10, 2002
Creator: Zhang, Z. F.; Ward, Andy L. & Gee, Glendon W.
Partner: UNT Libraries Government Documents Department
open access

Electroabsorption and Transport Measurements and Modeling Research in Amorphous Silicon Based Solar Cells: Final Technical Report, 24 March 1998--15 August 2002

Description: The contributions of this research project to amorphous silicon solar cells are in the following areas: (1) Improved understanding of the open-circuit voltage; (2) Improved knowledge of the built-in potential; (3) Variations in hole drift-mobilities for differing forms of a-Si:H; (4) Infrared spectroscopy of interfaces in a-Si:H cells; (5) Polymer p-layers; and (6) Hydrogen-based models for defects and metastability.
Date: December 1, 2002
Creator: Schiff, E. A.; Middya, A. R.; Lyou, J.; Kopidakis, N.; Rane, S.; Rao, P. et al.
Partner: UNT Libraries Government Documents Department
open access

Photocharge Transport and Recombination Measurements in Amorphous Silicon Films and Solar Cells by Photoconductive Frequency Mixing: Final Subcontract Report, 20 April 1998-30 June 2002

Description: The tasks carried out under this subcontract focused on characterizing the charge transport, opto-electronic, and structural properties of a number of amorphous and microcrystalline semiconductors prepared by several techniques. The dominant approach to accomplish the tasks of the present phase of the program is the photoconductive frequency mixing technique. This technique enabled us to determine separately the drift mobility and the photomixing lifetime of the photogenerated carriers. The tec… more
Date: December 1, 2002
Creator: Braunstein, R.; Boshta, M.; Sheng, S.; Kattwinkel, A.; Liebe, J. & Sun, G.
Partner: UNT Libraries Government Documents Department
open access

Comparison of Implicit and Symbolic Implicit Monte Carlo Line Transport with Frequency Weight Vector Extension

Description: We compare the Implicit Monte Carlo (IMC) technique to the Symbolic IMC (SIMC) technique, with and without weight vectors in frequency space, for time-dependent line transport in the presence of collisional pumping. We examine the efficiency and accuracy of the IMC and SIMC methods for test problems involving the evolution of a collisionally pumped trapping problem to its steady-state, the surface heating of a cold medium by a beam, and the diffusion of energy from a localized region that is co… more
Date: December 3, 2002
Creator: McKinley, M. S.; Brooks, E. D., III & Szoke, A.
Partner: UNT Libraries Government Documents Department
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