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3-D UNSTRUCTURED HEXAHEDRAL-MESH Sn TRANSPORT METHODS
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). We have developed a method for solving the neutral-particle transport equation on 3-D unstructured hexahedral meshes using a S{sub n} discretization in angle in conjunction with a discontinuous finite-element discretization in space and a multigroup discretization in energy. Previous methods for solving this equation in 3-D have been limited to rectangular meshes. The unstructured-mesh method that we have developed is far more efficient for solving problems with complex 3-D geometric features than rectangular-mesh methods. In spite of having to make several compromises in our spatial discretization technique and our iterative solution technique, our method has been found to be both accurate and efficient for a broad class of problems.
Date:
November 1, 2000
Creator:
Morel, J. & McGhee, J.
Object Type:
Report
System:
The UNT Digital Library
2020 Vision Project Summary
Since the 2020 Vision project began in 1996, students from participating schools have completed and submitted a variety of scenarios describing potential world and regional conditions in the year 2020 and their possible effect on US national security. This report summarizes the students' views and describes trends observed over the course of the 2020 Vision project's five years. It also highlights the main organizational features of the project. An analysis of thematic trends among the scenarios showed interesting shifts in students' thinking, particularly in their views of computer technology, US relations with China, and globalization. In 1996, most students perceived computer technology as highly beneficial to society, but as the year 2000 approached, this technology was viewed with fear and suspicion, even personified as a malicious, uncontrollable being. Yet, after New Year's passed with little disruption, students generally again perceived computer technology as beneficial. Also in 1996, students tended to see US relations with China as potentially positive, with economic interaction proving favorable to both countries. By 2000, this view had transformed into a perception of China emerging as the US' main rival and ''enemy'' in the global geopolitical realm. Regarding globalization, students in the first two years of the …
Date:
November 1, 2000
Creator:
Gordon, K. W. & Scott, K. P.
Object Type:
Report
System:
The UNT Digital Library
ACCELERATOR TRANSMUTATION OF WASTE TECHNOLOGY AND IMPLEMENTATION SCENARIOS
During 1999, the U.S. Department of Energy, in conjunction with its nuclear laboratories, a national steering committee, and a panel of world experts, developed a roadmap for research, development, demonstration, and deployment of Accelerator-driven Transmutation of Waste (ATW). The ATW concept that was examined in this roadmap study was based on that developed at the Los Alamos National Laboratory (LANL) during the 1990s. The reference deployment scenario in the Roadmap was developed to treat 86,300 tn (metric tonnes initial heavy metal) of spent nuclear fuel that will accumulate through 2035 from existing U.S. nuclear power plants (without license extensions). The disposition of this spent nuclear reactor fuel is an issue of national importance, as is disposition of spent fuel in other nations. The U.S. program for the disposition of this once-through fuel is focused to characterize a candidate site at Yucca Mountain, Nevada for a geological repository for spent fuel and high-level waste. The ATW concept is being examined in the U.S. because removal of plutonium minor actinides, and two very long-lived isotopes from the spent fuel can achieve some important objectives. These objectives include near-elimination of plutonium, reduction of the inventory and mobility of long-lived radionuclides in the repository, …
Date:
November 1, 2000
Creator:
BELLER, D. & TUYLE, G. VAN
Object Type:
Article
System:
The UNT Digital Library
ACHIEVING THE REQUIRED COOLANT FLOW DISTRIBUTION FOR THE ACCELERATOR PRODUCTION OF TRITIUM (APT) TUNGSTEN NEUTRON SOURCE
The Accelerator Production of Tritium neutron source consists of clad tungsten targets, which are concentric cylinders with a center rod. These targets are arranged in a matrix of tubes, producing a large number of parallel coolant paths. The coolant flow required to meet thermal-hydraulic design criteria varies with location. This paper describes the work performed to ensure an adequate coolant flow for each target for normal operation and residual heat-removal conditions.
Date:
November 1, 2000
Creator:
SIEBE, D. & PASAMEHMETOGLU, K.
Object Type:
Article
System:
The UNT Digital Library
Actinide Molecular Science: F-Electronic Structure in Synthesis, Spectroscopy, and Computation
This report focuses on the understanding of the relative roles of 5f/6d electronics on chemical bonding the relative roles of the iconic and covalent behaviors and polar and nonpolar solvents in controlling actinide chemical reactivity.
Date:
November 1, 2000
Creator:
Berg, J.; Burns, C. & Al, Et
Object Type:
Report
System:
The UNT Digital Library
Active Feedback Stabilization of the Resistive Wall Mode on the DIII-D Device
A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device. The RWM was successfully suppressed and the high beta duration above the no wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.
Date:
November 1, 2000
Creator:
Okabayashi, M; Bialek, J; Chance, M S; Chu, M S; Fredrickson, E D; Garofalo, A M et al.
Object Type:
Article
System:
The UNT Digital Library
ACTIVE FEEDBACK STABILZATION OF THE RESISTIVE WALL MODE ON THE DIII-D DEVICE
A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device [Plasma Phys. and Contr. Fusion Research (International Atomic Energy Agency, Vienna, 1986), p. 159]. The RWM was successfully suppressed and the high beta duration above the no wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.
Date:
November 1, 2000
Creator:
Okabayashi, M.; Bialek, J.; Chance, M. S.; Chu, M. S.; Fredrickson, E. D.; Garofalo, A. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Activities of the Texas Groundwater Protection Committee: Report to the 77th Legislature
A report which summarizes the activities for the preceding two years and provides recommendations to improve groundwater protection.
Date:
November 2000
Creator:
Texas Groundwater Protection Committee
Object Type:
Report
System:
The Portal to Texas History
Adiabatic Quasi-Spherical Compressions Driven by Magnetic Pressure for Inertial Confinement Fusion
The magnetic implosion of a high-Z quasi-spherical shell filled with DT fuel by the 20-MA Z accelerator can heat the fuel to near-ignition temperature. The attainable implosion velocity on Z, 13-cm/{micro}s, is fast enough that thermal losses from the fuel to the shell are small. The high-Z shell traps radiation losses from the fuel, and the fuel reaches a high enough density to reabsorb the trapped radiation. The implosion is then nearly adiabatic. In this case the temperature of the fuel increases as the square of the convergence. The initial temperature of the fuel is set by the heating of an ion acoustic wave to be about 200-eV after a convergence of 4. To reach the ignition temperature of 5-keV an additional convergence of 5 is required. The implosion dynamics of the quasi-spherical implosion is modeled with the 2-D radiation hydrodynamic code LASNEX. LASNEX shows an 8-mm diameter quasi-spherical tungsten shell on Z driving 6-atmospheres of DT fuel nearly to ignition at 3.5-keV with a convergence of 20. The convergence is limited by mass flow along the surface of the quasi-spherical shell. With a convergence of 20 the final spot size is 400-{micro}m in diameter.
Date:
November 1, 2000
Creator:
NASH,THOMAS J.
Object Type:
Report
System:
The UNT Digital Library
The Adsorption and Reactions of Halogenated Volatile Organic Compounds (VOCs) on Metal Oxides - Final Report
The purpose of this research was to provide a fundamental understanding of the adsorption and catalytic reactions of CCl{sub 4} on metal oxide surfaces with a view to developing strategies for its remediation. The scientific knowledge generated by this project should enable environmental engineers to evaluate the potential of destructive adsorption of CCl{sub 4} and the catalytic reaction of CCl{sub 4} with H{sub 2}O as an alternative for the remediation of carbon tetrachloride. Emphasis was placed on the alkaline earth metal oxides, i.e., MgO, CaO, SrO and BaO because it had previously been demonstrated that MgO and CaO reacted with CCl{sub 4} to form the corresponding metal chloride and carbon dioxide. This process was named destructive adsorption. It was found that the activity toward CCl{sub 4} parallels the basicity of the alkaline earth metal oxide, i.e., the activity decreased in the order BaO>SrO>CaO>MgO. It was found that MgO is active as a catalyst for the reaction of CCl{sub 4} with H{sub 2}O to form CO{sub 2} and HCl. The HCl could be neutralized in aqueous NaOH, and the resulting dilute salt solution could be easily disposed of. Among the alkaline earth oxides, MgO is the only active catalyst at moderate …
Date:
November 1, 2000
Creator:
Lunsford, J. H.
Object Type:
Report
System:
The UNT Digital Library
Advanced Computational Model for Three-Phase Slurry Reactors Progress Report: November 2000
In the first year of the project, solid-fluid mixture flows in ducts and passages at different angle of orientations were analyzed. The model predictions are compared with the experimental data and good agreement was found. Progress was also made in analyzing the gravity chute flows of solid-liquid mixtures. An Eulerian-Lagrangian formulation for analyzing three-phase slurry flows in a bubble column is being developed. The approach uses an Eulerian analysis of gas liquid flows in the bubble column, and makes use of the Lagrangian particle tracking procedure to analyze the particle motions. Progress was also made in developing a rate dependent thermodynamically consistent model for multiphase slurry flows in a state of turbulent motion. The new model includes the effect of phasic interactions and leads to anisotropic effective phasic stress tensors. Progress was also made in measuring concentration and velocity of particles of different sizes near a wall in a duct flow. The formulation of a thermodynamically consistent model for chemically active multiphase solid-fluid flows in a turbulent state of motion was also initiated. The general objective of this project is to provide the needed fundamental understanding of three-phase slurry reactors in Fischer-Tropsch (F-T) liquid fuel synthesis. The other main goal …
Date:
November 1, 2000
Creator:
Ahmadi, Goodarz
Object Type:
Report
System:
The UNT Digital Library
The Age, Volume 23, Number 11, November 2000
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
November 2000
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 101, No. 200, Ed. 1 Wednesday, November 1, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 1, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, November 1, 2000
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
November 1, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Analysis of Lithium-Ion Battery Degradation During Thermal Aging
None
Date:
November 1, 2000
Creator:
Jungst, Rudolph G.; Nagasubramanian, Ganesan; Crafts, Chris C.; Ingersoll, David & Doughty, Daniel H.
Object Type:
Article
System:
The UNT Digital Library
ANTIHYDROGEN PRODUCTION AND PRECISION SPECTROSCOPY WITH ATHENA/AD-1
CPT invariance is a fundamental property of quantum field theories in flat space-time. Principal consequences include the predictions that particles and their antiparticles have equal masses and lifetimes, and equal and opposite electric charges and magnetic moments. It also follows that the fine structure, hyperfine structure, and Lamb shifts of matter and antimatter bound systems should be identical. It is proposed to generate new stringent tests of CPT using precision spectroscopy on antihydrogen atoms. An experiment to produce antihydrogen at rest has been approved for running at the Antiproton Decelerator (AD) at CERN. We describe the fundamental features of this experiment and the experimental approach to the first phase of the program, the formation and identification of low energy antihydrogen.
Date:
November 1, 2000
Creator:
HOLZSCHEITER, M.; AMSLER, C. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Application of non-linear system model updating using feature extraction and parameter effects analysis
This research presents a new method to improve analytical model fidelity for non-linear systems. The approach investigates several mechanisms to assist the analyst in updating an analytical model based on experimental data and statistical analysis of parameter effects. The first is a new approach at data reduction called feature extraction. This is an expansion of the classic update metrics to include specific phenomena or character of the response that is critical to model application. This is an extension of the familiar linear updating paradigm of utilizing the eigen-parameters or FRF's to include such devices as peak acceleration, time of arrival or standard deviation of model error. The next expansion of the updating process is the inclusion of statistical based parameter analysis to quantify the effects of uncertain or significant effect parameters in the construction of a meta-model. This provides indicators of the statistical variation associated with parameters as well as confidence intervals on the coefficients of the resulting meta-model. Also included in this method is the investigation of linear parameter effect screening using a partial factorial variable array for simulation. This is intended to aid the analyst in eliminating from the investigation the parameters that do not have a significant …
Date:
November 1, 2000
Creator:
Schultze, J. & Hemez, F.
Object Type:
Article
System:
The UNT Digital Library
An Audit Report on Performance Measures at 25 State Agencies and Educational Institutions - Phase 14
Report of the Texas State Auditor's Office related to determining whether selected state entities are accurately reporting their key performance measures to the Automated Budget and Evaluation System of Texas (ABEST) database, and whether the state entities have adequate control systems in place over the collection and reporting of their performance measures.
Date:
November 2000
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
AUTOMATIC DIFFERENTIATION OF AN EULERIAN HYDROCODE
Automatic differentiation (AD) is applied to a two-dimensional Eulerian hydrodynamics computer code (hydrocode) to provide gradients that will be used for design optimization and uncertainty analysis. We examine AD in both the forward and adjoint (reverse) mode using Automatic Differentiation of Fortran (ADIFOR, version 3.0). Setup time, accuracy, and run times are described for three problems. The test set consists of a one-dimensional shock-propagation problem, a two-dimensional metal-jet-formation problem and a two-dimensional shell-collapse problem. Setup time for ADIFOR was approximately one month starting from a simplified, fixed-dimension version of the original code. ADIFOR produced accurate (as compared to finite difference) gradients in both modes for all of the problems. These test problems had 17 independent variables. We find that the forward mode is up to 39% slower and the adjoint mode is at least 11% faster than finding the gradient by means of finite differences. Problems of real interest will certainly have more independent variables. The adjoint mode is thus favored since the computational time increases only slightly for additional independent variables.
Date:
November 1, 2000
Creator:
HENNINGER, R.; CARLE, A. & MAUDLIN, P.
Object Type:
Article
System:
The UNT Digital Library
Baseline and optional bench-scale testing of a chemical candle filter safeguard device
This project was undertaken by the Energy and Environmental Research Center (EERC) to design, construct, and test the feasibility of a hot-gas filter safeguard device (SGD) to prevent the release of dust in the event of candle filter failure under both pressurized fluidized-bed combustion (PFBC) (oxidizing) and integrated gasification combined cycle (IGCC) (reducing) operating conditions. The SGD must use existing filter system seals, gaskets, fixtures, and assemblies as much as possible. It must also activate quickly when a candle filter has failed, preferably preventing dust concentrations downstream of the SGD from exceeding 1 ppmw. In addition, the SGD must be able to operate in an inactive mode with minimal pressure drop, and its operation cannot be affected by repeated backpulse cleaning events of up to 3 psia and 1/2 second in duration.
Date:
November 1, 2000
Creator:
Hurley, John P. & Swanson, Michael L.
Object Type:
Report
System:
The UNT Digital Library
BASIN-CENTERED GAS SYSTEMS OF THE U.S.
The USGS is re-evaluating the resource potential of basin-centered gas accumulations in the U.S. because of changing perceptions of the geology of these accumulations, and the availability of new data since the USGS 1995 National Assessment of United States oil and gas resources (Gautier et al., 1996). To attain these objectives, this project used knowledge of basin-centered gas systems and procedures such as stratigraphic analysis, organic geochemistry, modeling of basin thermal dynamics, reservoir characterization, and pressure analysis. This project proceeded in two phases which had the following objectives: Phase I (4/1998 through 5/1999): Identify and describe the geologic and geographic distribution of potential basin-centered gas systems, and Phase II (6/1999 through 11/2000): For selected systems, estimate the location of those basin-centered gas resources that are likely to be produced over the next 30 years. In Phase I, we characterize thirty-three (33) potential basin-centered gas systems (or accumulations) based on information published in the literature or acquired from internal computerized well and reservoir data files. These newly defined potential accumulations vary from low to high risk and may or may not survive the rigorous geologic scrutiny leading towards full assessment by the USGS. For logistical reasons, not all basins received the …
Date:
November 1, 2000
Creator:
Popov, Marin A.; Nuccio, Vito F.; Dyman, Thaddeus S.; Gognat, Timothy A.; Johnson, Ronald C.; Schmoker, James W. et al.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 341, Ed. 1 Wednesday, November 1, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 1, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Beam-based Measurements of Persistent Current Decay in RHIC
N/A
Date:
November 1, 2000
Creator:
Fischer, W.; Jain, A. & Tepikian, S.
Object Type:
Report
System:
The UNT Digital Library
[Benjamin Apartments Photograph #1]
Photograph of the Benjamin Apartments in Houston, Texas.
Date:
November 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History