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Alumni J-TAC, Homecoming 1997
Homecoming edition of the Tarleton State University alumni magazine describing related events and other news about university students, staff, and alumni.
Date:
Autumn 1997
Creator:
Tarleton State University
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Vol. 154, No. 12, Ed. 1 Thursday, November 20, 1997
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
November 20, 1997
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Parallel algorithm for transient solid dynamics simulations using finite elements and smoothed particle hydrodynamics
An efficient, scalable, parallel algorithm for treating contacts in solid mechanics has been applied to interactions between particles in smooth particle hydrodynamics (SPH). The algorithm uses three different decompositions within a single timestep: (1) a static FE-decomposition of mesh elements; (2) a dynamic SPH-decomposition of SPH particles; (3) and a dynamic contact-decomposition of contact nodes and SPH particles. The overhead cost of such a scheme is the cost of moving mesh and particle data between the decompositions. This cost turns out to be small in practice, leading to a highly load-balanced decomposition in which to perform each of the three major computational states within a timestep.
Date:
May 1, 1997
Creator:
Attaway, S. W.; Hendrickson, B. A.; Plimpton, S. J.; Swegle, J. W.; Gardner, D. R. & Vaughan, C. T.
Object Type:
Article
System:
The UNT Digital Library
Optical assessment of large marine particles: Development of an imaging and analysis system for quantifying large particle distributions and fluxes. Final report, June 1992--May 1996
The central goal of DOE`s Ocean Margin Program (OMP) has been to determine whether continental shelves are quantitatively significant in removing carbon dioxide from the atmosphere and isolating it via burial in sediments or exporting it to the open ocean. The overall objective of this work within OMP was to develop an instrument package to measure the large aggregate population of particles in the shelf/slope environment at a rate sufficient to integrate the observed particle distributions into the coupled physical and biogeochemical models necessary to understand the shelf and slope as a system. Pursuant to this the authors have developed a video and optical instrument package (LAPS: Large Aggregate Profiling System) and assembled the computer and software methods to routinely measure a wide spectrum of the large aggregate population of particles in the shelf/slope environment. This particle population, encompassing the `marine snow` size particles (dia. > 0.5 mm), is thought to be the major pathway of material flux in the ocean. The instrument package collects aggregate abundance and size spectrum data using two video camera/strobe subsystems with a third subsystem collecting CTD, beam attenuation and fluorescence data. Additionally, measurements of particle flux were made with sediment traps deployed on the …
Date:
April 1, 1997
Creator:
Walsh, I. D. & Gardner, W. D.
Object Type:
Report
System:
The UNT Digital Library
7th International Workshop on the Identification of Transcribed Sequences. Beyond the Identification of Transcribed Sequences
The Seventh Annual Human Genome Conference: Beyond the Identification of Transcribed Sequences (BITS) was held November 16-19, 1997 at the Asilomar Conference Center in Monterey, California. The format for the meeting was a combination of oral presentations, group discussions and poster sessions. The original workshop was held to discuss methodologies for the identification of transcribed sequences in mammalian genomes. Over the years, the focus of the workshops has gradually shifted towards functional analysis, with the most dramatic change in emphasis at this meeting, as reflected in the modest change in the workshop title. Topics presented and discussed included: (1) large scale expression and mutational analysis in yeast, C. elegans, Drosophila and zebrafish, (2) comparative mapping of zebrafish, chicken and Fugu; (3) functional analysis in mouse using promoter traps, mutational analysis of biochemical pathways, and Cre/lox constructs; (4) construction of 5 foot end and complete cDNA libraries; (5) expression analysis in mammalian organisms by array screening and differential display; (6) genome organization as determined by detailed transcriptional mapping and genomic sequence analysis; (7) analysis of genomic sequence, including gene and regulatory sequence predictions, annotation of genomic sequence, development of expression databases and verification of sequence analysis predictions; and (8) structural/functional relationships …
Date:
November 19, 1997
Creator:
Gardner, Kathleen
Object Type:
Report
System:
The UNT Digital Library
Reservoir enhancement on the impermeable margins of productive geothermal fields
This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos national Laboratory (LANL). The overall goal of the project was to evaluate the performance of Los Alamos technology in selected geothermal fields, to adapt the technology to the existing industry infrastructure where necessary, and to facilitate its application through demonstration and communication. The primary specific objective was to identify, collaborate, and partner with geothermal energy- producing companies in an evaluation of the application of Los Alamos microseismic mapping technology for locating fracture permeability in producing geothermal fields.
Date:
January 1, 1997
Creator:
Goff, S.; Gardner, J.; Dreesen, D. & Whitney, E.
Object Type:
Report
System:
The UNT Digital Library
Thin film porous membranes for catalytic sensors
This paper reports on new and surprising experimental data for catalytic film gas sensing resistors coated with nanoporous sol-gel films to impart selectivity and durability to the sensor structure. This work is the result of attempts to build selectivity and reactivity to the surface of a sensor by modifying it with a series of sol-gel layers. The initial sol-gel SiO{sub 2} layer applied to the sensor surprisingly showed enhanced O{sub 2} interaction with H{sub 2} and reduced susceptibility to poisons such as H{sub 2}S.
Date:
June 1, 1997
Creator:
Hughes, R.C.; Boyle, T.J. & Gardner, T.J.
Object Type:
Article
System:
The UNT Digital Library
Downhole pulse tube refrigerators
This report summarizes a preliminary design study to explore the plausibility of using pulse tube refrigeration to cool instruments in a hot down-hole environment. The original motivation was to maintain Dave Reagor`s high-temperature superconducting electronics at 75 K, but the study has evolved to include three target design criteria: cooling at 30 C in a 300 C environment, cooling at 75 K in a 50 C environment, cooling at both 75 K and 30 C in a 250 C environment. These specific temperatures were chosen arbitrarily, as representative of what is possible. The primary goals are low cost, reliability, and small package diameter. Pulse-tube refrigeration is a rapidly growing sub-field of cryogenic refrigeration. The pulse tube refrigerator has recently become the simplest, cheapest, most rugged and reliable low-power cryocooler. The authors expect this technology will be applicable downhole because of the ratio of hot to cold temperatures (in absolute units, such as Kelvin) of interest in deep drilling is comparable to the ratios routinely achieved with cryogenic pulse-tube refrigerators.
Date:
December 1, 1997
Creator:
Swift, G. & Gardner, D.
Object Type:
Report
System:
The UNT Digital Library
Black Preaching in the Literary Tradition, Tape 2
Video footage from The Black Academy of Arts and Letters recorded during the 20th anniversary season event entitled "Black Preaching in the Literary Tradition" held on March 1st, 1997. The footage shows the second half of the event including various pastor speakers on the poetical and metaphoric language in the Bible and sermons. The video begins with pastor Wright Lassiter of Saint John Missionary Baptist Church. The event covers the influence of the Bible and its literary style on the spirituality of the black community.
Date:
March 1, 1997
Creator:
Walker, Wyatt Tee & Clark, Caesar A. W.
Object Type:
Video
System:
The UNT Digital Library
Ion-implantation doping of silicon carbide
Because of their commercial availability in bulk single crystal form, the 6H- and 4H- polytypes of SiC are gaining importance for high-power, high-temperature, and high-frequency device applications. Selective area doping is a crucial processing step in integrated circuit manufacturing. In Si technology, selective area doping is accomplished by thermal diffusion or ion-implantation. Because of the low diffusion coefficients of most impurities in SiC, ion implantation is indispensable in SiC device manufacturing. In this paper the authors present their results on donor, acceptor, and compensation implants in 6H-SiC.
Date:
October 1, 1997
Creator:
Gardner, J.; Edwards, A.; Rao, M.V.; Papanicolaou, N.; Kelner, G. & Holland, O.W.
Object Type:
Article
System:
The UNT Digital Library
Class 44-W-9
Book commemorating the 44-W-9 class of women pilots at Avenger Field in Sweetwater, Texas. It includes biographical sketches, photographs, and illustrations about the class and the program.
Date:
1997
Creator:
Turner, Betty Stagg
Object Type:
Book
System:
The Portal to Texas History
Accumulator ring lattice for the national spallation neutron source
The Accumulator Ring for the proposed National Spallation Neutron Source (NSNS) is to accept a 1.03 millisecond beam pulse from a 1 GeV Proton Linac at a repetition rate of 60 Hz. For each beam pulse, 10{sup 14} protons are to be accumulated via charge-exchange injection. A 295 nanosecond gap in the beam, maintained by an rf system, will allow for extraction to an external target for the production of neutrons by spallation. This paper describes the four-fold symmetric lattice that has been chosen for the ring. The lattice contains four long dispersion-free straight sections to accomodate injection, extraction, rf cavities, and beam scraping respectively. The four-fold symmetry allows for easy adjustment of the tunes and flexibility in the placement of correction elements, and ensures that potentially dangerous betatron structure resonances are avoided.
Date:
August 1997
Creator:
Gardner, C. J.; Lee, Y. Y. & Luccio, A. U.
Object Type:
Article
System:
The UNT Digital Library
Ion-implantation doping in SiC and its device applications
The latest ion-implantation results on SiC are presented. The authors have performed nitrogen and phosphorus (N/P) co-implantations to obtain very high n-type carrier concentrations, Si and C bombardments for compensating n-type SiC, and V-implantation for compensating p-type SiC. They have also performed N and Al implantations directly into V-doped semi-insulating 6H-SiC substrates. Vertical p-n junction diodes were made by selective area N, P, and N/P implantations into p-type epitaxial layers grown on 6H-SiC substrates.
Date:
October 1, 1997
Creator:
Rao, M.V.; Gardner, J.; Edwards, A.; Papanicolaou, N.; Kelner, G.; Holland, O.W. et al.
Object Type:
Article
System:
The UNT Digital Library
The development and performance of a message-passing version of the PAGOSA shock-wave physics code
A message-passing version of the PAGOSA shock-wave physics code has been developed at Sandia National Laboratories for multiple-instruction, multiple-data stream (MIMD) computers. PAGOSA is an explicit, Eulerian code for modeling the three-dimensional, high-speed hydrodynamic flow of fluids and the dynamic deformation of solids under high rates of strain. It was originally developed at Los Alamos National Laboratory for the single-instruction, multiple-data (SIMD) Connection Machine parallel computers. The performance of Sandia`s message-passing version of PAGOSA has been measured on two MIMD machines, the nCUBE 2 and the Intel Paragon XP/S. No special efforts were made to optimize the code for either machine. The measured scaled speedup (computational time for a single computational node divided by the computational time per node for fixed computational load) and grind time (computational time per cell per time step) show that the MIMD PAGOSA code scales linearly with the number of computational nodes used on a variety of problems, including the simulation of shaped-charge jets perforating an oil well casing. Scaled parallel efficiencies for MIMD PAGOSA are greater than 0.70 when the available memory per node is filled (or nearly filled) on hundreds to a thousand or more computational nodes on these two machines, indicating that …
Date:
October 1, 1997
Creator:
Gardner, David R. & Vaughan, Courtenay T.
Object Type:
Report
System:
The UNT Digital Library
Geoscience/engineering characterization of the interwell environment in carbonate reservoirs based on outcrop analogs, Permian Basin, West Texas and New Mexico-stratigraphic hierarchy and cycle stacking facies distribution, and interwell-scale heterogeneity: Grayburg Formation, New Mexico. Final report
The Grayburg Formation (middle Guadalupian) is a major producing interval in the Permian Basin and has yielded more than 2.5 billion barrels of oil in West Texas. Grayburg reservoirs have produced, on average, less than 30 percent of their original oil in place and are undergoing secondary and tertiary recovery. Efficient design of such enhanced recovery programs dictates improved geological models to better understand and predict reservoir heterogeneity imposed by depositional and diagenetic controls. The Grayburg records mixed carbonate-siliciclastic sedimentation on shallow-water platforms that rimmed the Delaware and Midland Basins. Grayburg outcrops in the Guadalupe and Brokeoff Mountains region on the northwest margin of the Delaware Basin present an opportunity to construct a detailed, three-dimensional image of the stratigraphic and facies architecture. This model can be applied towards improved description and characterization of heterogeneity in analogous Grayburg reservoirs. Four orders of stratigraphic hierarchy are recognized in the Grayburg Formation. The Grayburg represents a long-term composite sequence composed of four high-frequency sequences (HFS 1-4). Each HFS contains several composite cycles comprising two or more cycles that define intermediate-scale transgressive-regressive successions. Cycles are the smallest scale upward-shoaling vertical facies successions that can be recognized and correlated across various facies tracts. Cycles thus …
Date:
June 1, 1997
Creator:
Barnaby, R. J.; Ward, W. B. & Jennings, Jr., J. W.
Object Type:
Report
System:
The UNT Digital Library
Use of coal liquefaction catalysts for coal/oil coprocessing and heavy oil upgrading
The catalytic hydrogenation of coal and model solvents using dispersed or supported catalysts at different pressures has been the focus of several recent studies at PETC. The effectiveness of these catalysts has been studied in coal liquefaction and coal-oil coprocessing. Coal-oil coprocessing involves the co-reaction of coal and petroleum-derived oil or resid. The results of these studies have indicated that both dispersed and supported catalysts are effective in these systems at elevated H{sub 2} pressures ({approximately}2,500 psig). Attempts to reduce pressure indicated that a combination of catalyst concentration and solvent quality could be used to compensate for reductions in H{sub 2} pressure. Comparison of the coal and coprocessing systems reveals many similarities in the catalytic requirements for both systems. Both hydrogenation and hydrogenolysis activities are required and the reactive environments are similar. Also, the use of catalysts in the two systems shares problems with similar types of inhibitors and poisons. The logical extension of this is that it may be reasonable to expect similar trends in catalyst activity for both systems. In fact, many of the catalysts selected for coal liquefaction were selected based on their effectiveness in petroleum systems. This study investigates the use of supported and dispersed coal …
Date:
April 1, 1997
Creator:
Cugini, A. V.; Krastman, D.; Thompson, R. L.; Gardner, T. J. & Ciocco, M. V.
Object Type:
Article
System:
The UNT Digital Library
Loblolly Book of Baseball
Book containing biographical sketches of famous baseball players from Panola County, Texas: Don Clinton, Victor Frasier, Jacke Davis, Bob Allen, Douglas Ault, Jonathan Perlman, David Lowery, Robert Ellis, Tom Harkrider, Mark Brandenburg, Todd Haney, J.J. Munoz, and Kip Harkrider.
Date:
March 1997
Creator:
King, Lincoln & Hazelwood, Beth
Object Type:
Book
System:
The Portal to Texas History
Forest Landscape Dynamics: a Semi-Markov Modeling Approach
A transition model (MOSAIC) is used to describe forest dynamics at the landscape scale. The model uses a semi-Markov framework by considering transition probabilities and Erlang distributed holding times in each transition. Parameters for the transition model are derived from a gap model (ZELIG). This procedure ensures conceptual consistency of the landscape model with the fine scale ecological detail represented by the forest gap model. Spatial heterogeneity in the transition model is driven by maps of terrain with characteristics contained in a Geographic Information System (GIS) database. The results of the transition model simulations, percent cover forest type maps, are exported to grid-maps in the GIS. These cover type maps can be classified and used to describe forest dynamics using landscape statistics metrics. The linkage model-GIS enhances the transition model spatial analytical capabilities. A parameterization algorithm was developed that takes as input gap model tracer files which contain the percent occupation of each cover type through time. As output, the algorithm produces a file that contains the parameter values needed for MOSAIC for each one of the possible transitions. Parameters for the holding time distribution were found by calculating an empirical estimate of the cumulative probability function and using a …
Date:
August 1997
Creator:
Ablan, Magdiel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accumulator ring design for the NSNS project
The goal of the proposed National Spallation Neutron Source (NSNS) is to provide a short pulse proton beam of about 0.5 {mu}s with average beam power of 1 MW. To achieve such purpose, a proton storage ring operated at 60 Hz with 1 x 10{sup 14} protons per pulse at 1 GeV is required. The Accumulator Ring (AR) receives 1 msec long H{sup {minus}} beam bunches of 28 mA from a 1 GeV linac. Scope and design performance goals of the AR are presented, other possible technological choices and design options considered, but not adopted, are also briefly reviewed.
Date:
July 1, 1997
Creator:
Weng, W. T.; Alessi, J. & Beebe-Wang, J.
Object Type:
Article
System:
The UNT Digital Library
Micromachined pressure sensors: Review and recent developments
Since the discovery of piezoresistivity in silicon in the mid 1950s, silicon-based pressure sensors have been widely produced. Micromachining technology has greatly benefited from the success of the integrated circuits industry, burrowing materials, processes, and toolsets. Because of this, microelectromechanical systems (MEMS) are now poised to capture large segments of existing sensor markets and to catalyze the development of new markets. Given the emerging importance of MEMS, it is instructive to review the history of micromachined pressure sensors, and to examine new developments in the field. Pressure sensors will be the focus of this paper, starting from metal diaphragm sensors with bonded silicon strain gauges, and moving to present developments of surface-micromachined, optical, resonant, and smart pressure sensors. Considerations for diaphragm design will be discussed in detail, as well as additional considerations for capacitive and piezoresistive devices.
Date:
March 1, 1997
Creator:
Eaton, W. P. & Smith, J. H.
Object Type:
Article
System:
The UNT Digital Library
A full-scale demonstration of in situ chemical oxidation through recirculation at the X-701B site
In 1996, researchers at Oak Ridge National Laboratory (ORNL) proposed an oxidant delivery technique involving injection and recirculation of the oxidant solution into a contaminated aquifer through multiple horizontal and vertical wells. This technique would be applicable to saturated, hydraulically conductive formations. In the spring of 1997, the Department of Energy (DOE) at the Portsmouth Gaseous Diffusion Plant (PORTS) agreed to collaborate with the DOE`s Subsurface Contaminants Focus Area to conduct a field-scale treatability study using in situ chemical oxidation through recirculation (ISCOR). PORTS agreed to support the demonstration at the X-701B site where the technology can potentially be used to remediate TCE-contaminated groundwater and sediments. The ISCOR field demonstration took advantage of existing infrastructure and extensive site characterization data generated from previous field demonstrations at X-701B. The field test was implemented using a pair of previously installed horizontal wells that transect an area of DNAPL contamination. Groundwater was extracted from one horizontal well, pumped to an existing pump and treat facility, dosed with KMnO{sub 4}, and re-injected into a parallel horizontal well approximately 90 ft away. The field demonstration lasted approximately one month. Treatment effectiveness was determined by comparing contaminant levels in pre-treatment, during, and post-treatment groundwater samples and …
Date:
December 1, 1997
Creator:
West, O. R.; Cline, S. R.; Holden, W. L.; Gardner, F. G.; Schlosser, B. M.; Thate, J. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Transient Solid Dynamics Simulations on the Sandia/Intel Teraflop Computer
Transient solid dynamics simulations are among the most widely used engineering calculations. Industrial applications include vehicle crashworthiness studies, metal forging, and powder compaction prior to sintering. These calculations are also critical to defense applications including safety studies and weapons simulations. The practical importance of these calculations and their computational intensiveness make them natural candidates for parallelization. This has proved to be difficult, and existing implementations fail to scale to more than a few dozen processors. In this paper we describe our parallelization of PRONTO, Sandia`s transient solid dynamics code, via a novel algorithmic approach that utilizes multiple decompositions for different key segments of the computations, including the material contact calculation. This latter calculation is notoriously difficult to perform well in parallel, because it involves dynamically changing geometry, global searches for elements in contact, and unstructured communications among the compute nodes. Our approach scales to at least 3600 compute nodes of the Sandia/Intel Teraflop computer (the largest set of nodes to which we have had access to date) on problems involving millions of finite elements. On this machine we can simulate models using more than ten- million elements in a few tenths of a second per timestep, and solve problems more …
Date:
December 31, 1997
Creator:
Attaway, S.; Brown, K.; Gardner, D.; Hendrickson, B. & Barragy, T.
Object Type:
Article
System:
The UNT Digital Library
Management of radioactive material safety programs at medical facilities. Final report
A Task Force, comprising eight US Nuclear Regulatory Commission and two Agreement State program staff members, developed the guidance contained in this report. This report describes a systematic approach for effectively managing radiation safety programs at medical facilities. This is accomplished by defining and emphasizing the roles of an institution`s executive management, radiation safety committee, and radiation safety officer. Various aspects of program management are discussed and guidance is offered on selecting the radiation safety officer, determining adequate resources for the program, using such contractual services as consultants and service companies, conducting audits, and establishing the roles of authorized users and supervised individuals; NRC`s reporting and notification requirements are discussed, and a general description is given of how NRC`s licensing, inspection and enforcement programs work.
Date:
May 1, 1997
Creator:
Camper, L. W.; Schlueter, J. & Woods, S.
Object Type:
Report
System:
The UNT Digital Library
Lead immobilization in thermally remediated soils and igneous rocks
This is the final report for a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The principal goal of this project was to investigate the speciation of lead in the environment at LANL and to determine the feasibility of using thermal remediation methods to immobilize lead in the environment. Lead occurs as pyromorphite [Pb(PO{sub 4}){sub 3}(Cl, OH)], cerussite (PbCO{sub 3}) and galena (PbS) in vapor-phase-altered Bandelier Tuff samples. LANL soils primarily contain cerussite and PbO. Thermal remediation experiments at high temperatures (up to 400 C) suggest that thermal immobilization of highly-reactive Pb compounds in the environment may be feasible, but that this technique is not optimal for more refractory lead phases such as cerussite and PbO.
Date:
June 1, 1997
Creator:
Hickmott, D. D.; Carey, J. W.; Stimac, J.; Larocque, A.; Abell, R.; Gauerke, E. et al.
Object Type:
Report
System:
The UNT Digital Library