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A 12-channel VMEbus-based pulse-height analysis module
The author describes a 12-channel VMEbus-based pulse-height analysis board that was designed for use in a high-rate, multidetector, gamma-ray imaging system. This module was designed to minimize dead-time losses and to allow all key parameters to be software controlled. Gamma-ray detectors are connected directly to this module, eliminating the need for additional electronics.
Date:
December 1, 1993
Creator:
Arnone, G. J.
Object Type:
Article
System:
The UNT Digital Library
500 MHz neutron detector
A {sup 10}B-loaded scintillation detector was built for neutron transmission measurements at the Los Alamos Neutron Scattering Center. The efficiency of the detector is nearly 100% for neutron energies from 0 to 1 keV. The neutron moderation time in the scintillator is about 250 ns and is energy independent. The detector and data processing system are designed to handle an instantaneous rate as high as 500 MHz. The active area of the detector is 40 cm in diameter.
Date:
December 1, 1993
Creator:
Yen, Yi-Fen; Bowman, J. D. & Matsuda, Y.
Object Type:
Article
System:
The UNT Digital Library
1993 International conference on nuclear waste management and environmental remediation, Prague, Czech Republic, September 5--11, 1993. Combined foreign trip report
The purpose of the trip was to attend the 1993 International Conference on Nuclear Waste Management and Environmental Remediation. The principal objective of this conference was to facilitate a truly international exchange of information on the management of nuclear wastes as well as contaminated facilities and sites emanating from nuclear operations. The conference was sponsored by the American Society of Mechanical Engineers, the Czech and Slovak Mechanical Engineering Societies, and the Czech and Slovak Nuclear Societies in cooperation with the Commission of the European Communities, the International Atomic Energy Agency, and the OECD Nuclear Agency. The conference was cosponsored by the American Nuclear Society, the Atomic Energy Society of Japan, the Canadian Nuclear Society, the (former USSR) Nuclear Society, and the Japan Society of Mechanical Engineers. This was the fourth in a series of biennial conferences, which started in Hong Kong, in 1987. This report summarizes shared aspects of the trip; however, each traveler`s observations and recommendations are reported separately.
Date:
December 1, 1993
Creator:
Slate, S. C. & Allen, R. E.
Object Type:
Report
System:
The UNT Digital Library
1993 Pacific Northwest Loads and Resources Study.
The Loads and Resources Study is presented in three documents: (1) this summary of Federal system and Pacific Northwest region loads and resources; (2) a technical appendix detailing forecasted Pacific Northwest economic trends and loads, and (3) a technical appendix detailing the loads and resources for each major Pacific Northwest generating utility. In this loads and resources study, resource availability is compared with a range of forecasted electricity consumption. The forecasted future electricity demands -- firm loads -- are subtracted from the projected capability of existing and {open_quotes}contracted for{close_quotes} resources to determine whether Bonneville Power Administration (BPA) and the region will be surplus or deficit. If resources are greater than loads in any particular year or month, there is a surplus of energy and/or capacity, which BPA can sell to increase revenues. Conversely, if firm loads exceed available resources, there is a deficit of energy and/or capacity, and additional conservation, contract purchases, or generating resources will be needed to meet load growth. The Pacific Northwest Loads and Resources Study analyzes the Pacific Northwest`s projected loads and available generating resources in two parts: (1) the loads and resources of the Federal system, for which BPA is the marketing agency; and (2) …
Date:
December 1, 1993
Creator:
United States. Bonneville Power Administration.
Object Type:
Report
System:
The UNT Digital Library
1993 Pacific Northwest Loads and Resources Study, Technical Appendix: Volume 2, Book 1, Energy.
The 1993 Pacific Northwest Loads and Resources Study establishes the Bonneville Power Administration`s (BPA) planning basis for supplying electricity to BPA customers. The Loads and Resources Study is presented in three documents: (1) this technical appendix detailing loads and resources for each major Pacific and Northwest generating utility, (2) a summary of Federal system and Pacific Northwest region loads and resources, and (3) a technical appendix detailing forecasted Pacific Northwest economic trends and loads. This analysis updates the 1992 Pacific Northwest Loads and Resources Study Technical Appendix published in December 1992. This technical appendix provides utility-specific information that BPA uses in its long-range planning. It incorporates the following for each utility (1) Electrical demand firm loads; (2) Generating resources; and (3) Contracts both inside and outside the region. This document should be used in combination with the 1993 Pacific Northwest Loads and Resources Study, published in December 1993, because much of the information in that document is not duplicated here.
Date:
December 1, 1993
Creator:
United States. Bonneville Power Administration.
Object Type:
Report
System:
The UNT Digital Library
1993 Pacific Northwest Loads and Resources Study, Technical Appendix: Volume 2, Book 2, Capacity.
Monthly totals of utility loads and capacities extrapolated as far as 2009 with a probability estimate of enough water resources for hydro power.
Date:
December 1, 1993
Creator:
United States. Bonneville Power Administration.
Object Type:
Report
System:
The UNT Digital Library
Accelerated screening methods for determining chemical and thermal stability of refrigerant-lubricant mixtures: Part 2, Experimental comparison and verification of methods. Quarterly technical progress report, 1 July 1993--30 September 1993
Research reported continued to concentrate on in situ conductivity measurements for development of an accelerated screening method for determining the chemical and thermal stabilities of refrigerant/lubricant mixtures. Tungsten rods were sealed into the round bottoms of the sealed tubes to provide electrical connections for in situ conductivity measurements. The in situ conductivity measurements were used to monitor the degradation of HFC-134a/ester oil mixtures heated at 175 C (347 F) for two days. Preliminary results indicate that the in situ conductivity measurements correlate with H-1 34a/oil degradation as determined by color measurements. A short study to evaluate the potential of in situ color measurements for development into an accelerated screening test was also performed. Initial results indicate that the in situ color measurements are not well suited for long-term, in situ degradation measurements.
Date:
December 1, 1993
Creator:
Kauffman, R.
Object Type:
Report
System:
The UNT Digital Library
Acoustic-structure interaction problems. Final report
The purpose of this report is to compare and evaluate different numerical methods for solving problems of interaction between elastic solids and acoustic fluids. In particular, we concentrate our efforts on solution techniques involving the finite element method. To that end, in Chapter 2 we discuss different options for analysis of infinite fluids. In particular, the method of mesh trunction and the use of radiation elements and the use of infinite elements are discussed. Also discussed is the analysis of scattering from rigid boundaries. Chapter 3 is a brief discussion of finite element formulations for elastic solids. We review the development, of two dimensional plane strain elements and one dimensional plate and shell elements. In Chapter 4, there is a discussion of the method used to couple the solid and the fluid. We give examples for solution of scattering of pressure waves from thin elastic shell structures. Chapter 5 is a brief conclusion of results and includes recommendations for the best methods of solution and additional research.
Date:
December 1, 1993
Creator:
Love, E. & Taylor, R.L.
Object Type:
Report
System:
The UNT Digital Library
Active or Passive Voice: Does It Matter?
This thesis reports on the use of active and passive voice in the workplace and classroom through analysis of surveys completed by 37 employees and 66 students. The surveys offered six categories of business writing with ten sets of two sentences each, written in active and passive voice. Participants selected one sentence from each set and gave a reason for each selection. The participants preferred active over passive 47 to 46 percent of opportunities, but they preferred mixed voice over both, 49 percent. The participants preferred active only for memos to supervisors; in the other five categories they preferred passive or mixed voice. Both males and females preferred mixed voice, and age appeared to influence the choices. They cited context as the most common reason for using passive.
Date:
December 1993
Creator:
Watson, Rose E. (Rose Elliott)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Acts of Survival: the Plight and Prospects of Dallas Theatre
A comprehensive investigation examines the decline and changes that have affected Dallas regional theatre development from the dream of Margo Jones in the 1940s to the proliferation of emerging theatres in 1993. Changing economic conditions, lack of audience support, and shortages of performance space have contributed to an exodus of Dallas actors and artists. Reviewed are measures to reverse this trend, including funding changes, awareness campaigns, improved inter-theatre cooperation, and guidelines for audience development. The study's conclusion notes that theatres do, indeed, have a natural life cycle, but with renewed emphasis on audience development and self-sufficiency, theatres in Dallas can endure and contribute to an enlarged sense of civic pride.
Date:
December 1993
Creator:
Leeman, Patricia Diane
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adsorption and desorption studies of cesium on sapphire surfaces
Adsorption/desorption were studied using combined surface analytical techniques. An approximate initial sticking coefficient for Cs on sapphire was measured using reflection mass spectrometry and found to be 0.9. Thermal Desorption Mass Spectrometry (TDMS) and Auger Electron Spectroscopy (AES) were used to verify that a significant decrease in sticking coefficient occurs as the Cs coverage reaches a critical submonolayer value. TDMS analysis demonstrates that Cs is stabilized on a clean sapphire surface at temperatures (1200 K) in excess of the temperatures experienced by sapphire in a TOPAZ-2 thermionic fuel element (TFE). Surface contaminants on sapphire can enhance Cs adsorption relative to the clean surface. C contamination eliminates the high temperature state of Cs desorption found on clean sapphire but shifts the bulk of the C desorption from 400 to 620 K. Surface C is a difficult contaminant to remove from sapphire, requiring annealing above 1400 K. Whether Cs is stabilized on sapphire in a TFE environment will most likely depend on relation between surface contamination and surface structure.
Date:
December 1, 1993
Creator:
Zavadil, K. R. & Ing, J. L.
Object Type:
Article
System:
The UNT Digital Library
Advanced aerodynamic research. Final technical report
A two-dimensional inviscid flow-field code was developed to assess the magnitude and impact of local pressure variations on a curved planar surface. The code uses a unique formation of the governing conservation equations in curvilinear streamtube coordinates which provides automatic grid generation and step control which are transparent to the user. The code is designed for straightforward extension to mixing-coupled condensing flows. This report includes (1) descriptions of the physical model and computer code; (2) example flow-field predictions/comparisons for selected test cases, and (3) a plan for code implementation to address and evaluate the condensation phenomena.
Date:
December 1, 1993
Creator:
Scriven, G. R. & Freeman, G. N.
Object Type:
Report
System:
The UNT Digital Library
Advanced coal conversion process demonstration. Progress report, January 1, 1992--December 31, 1992
This report contains a description of the technical progress made on the Advanced Coal Conversion Process (ACCP) Demonstration Project from January 1, 1992, through December 31, 1992. This project demonstrates an advanced thermal coal drying process, coupled with physical cleaning techniques, that is designed to upgrade high-moisture, low-rank coals to a high-quality, low-sulfur fuel, registered as the SynCoal{reg_sign} process. The coal is processed through three stages (two heating stages followed by an inert cooling stage) of vibrating fluidized bed reactors that remove chemically bound water, carboxyl groups, and volatile sulfur compounds. After drying, the coal is put through a deep-bed stratifier cleaning process to separate the pyrite-rich ash from the coal. The SynCoal{reg_sign} process enhances low-rank, western coals, usually with a moisture content of 25 to 55 percent, sulfur content of 0.5 to 1.5 percent, and heating value of 5,500 to 9,000 British thermal units per pound (Btu/lb), by producing a stable, upgraded, coal product with a moisture content as low as 1 percent, sulfur content as low as 0.3 percent, and heating value up to 12,000 Btu/lb. The 45-ton-per-hour unit is located adjacent to a unit train loadout facility at Western Energy Company`s Rosebud coal mine near Colstrip, Montana. …
Date:
December 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[Advanced Coal Conversion Process]. Technical progress report, July 1, 1992--September 30, 1992
This report contains a description of the technical progress made on the Advanced Coal Conversion Process (ACCP) Demonstration Project from July 1, 1992, through September 30, 1992. The ACCP Demonstration Project is a US Department of Energy (DOE) Clean Coal Technology Project. The Cooperative Agreement defining this project is between DOE and the Rosebud SynCoal Partnership. This project demonstrates an advanced, thermal, coal-drying process, coupled with physical cleaning techniques, that is designed to upgrade high-moisture, low-rank coals to a high-quality, low-sulfur fuel, registered as the SynCoal{reg_sign} process. The coal is processed through three stages (two heating stages followed by an inert cooling stage) of vibrating fluidized bed reactors that remove chemically bound water, carboxyl groups, and volatile sulfur compounds. After drying, the coal is put through a deep-bed stratifier cleaning process to separate the pyrite-rich ash from the coal. The SynCoal({reg_sign} process enhances low-rank, western coals, usually with a moisture content of 25 to 55 percent, sulfur content of 0.5 to 1.5 percent, and heating value of 5,500 to 9,000 British thermal units per pound (Btu/lb), by producing a stable, upgraded, coal product with a moisture content as low as 1 percent, sulfur content as low as 0.3 percent, and …
Date:
December 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced qualification techniques
This paper demonstrates use of the Qualified Manufacturers List (QML) methodology to qualify commercial and military microelectronics for use in space applications. QML ``builds in`` the hardness of product through statistical process control (SPC) of technology parameters relevant to the radiation response, test structure to integrated circuit (IC) correlations, and techniques for extrapolating laboratory test results to low-dose-rate space scenarios. Each of these elements is demonstrated and shown to be a cost-effective alternative to expensive end-of-line IC testing. Several examples of test structured-IC correlations are provided and recent work on complications arising from transistor scaling and geometry is discussed. The use of a 10-keV x-ray wafer-level test system to support SPC and establish ``process capability`` is illustrated and a comparison of 10-keV x-ray and Co{sup 60} gamma irradiations is provided for a wide range of CMOS technologies. The x-ray tester is shown to be cost-effective and its use in lot acceptance/qualification is recommended. Finally, a comparison is provided between MIL-STD-883D, Test Method 1019.4, which governs the testing of packaged semiconductor microcircuits in the DoD, and ESA/SSC Basic Specification No. 22900, Europe`s Total Dose Steady-State Irradiation Test Method. Test Method 1019.4 focuses on conservative estimates of MOS hardness for space and …
Date:
December 1, 1993
Creator:
Winokur, P. S; Shaneyfelt, M. R.; Meisenheimer, T. L. & Fleetwood, D. M.
Object Type:
Article
System:
The UNT Digital Library
Advanced thermally stable jet fuels. Technical progress report, July 1993--September 1993
The Penn State program in advanced thermally stable coal-based jet fuels has five broad objectives: (1) development of mechanisms of degradation and solids formation; (2) quantitative measurement of growth of sub-micrometer and micrometer-sized particles suspended in fuels during thermal stressing; (3) characterization of carbonaceous deposits by various instrumental and microscopic methods; (4) elucidation of the role of additives in retarding the formation of carbonaceous solids; (5) assessment of the potential of production of high yields of cycloalkanes by direct liquefaction of coal. An exploratory study was conducted to investigate the pyrolysis of n-butylbenzene in a flow reactor at atmospheric pressure. A number of similarities to trends previously observed in high-pressure static reactions were identified. The product distribution from pyrolysis of n-tetradecane at 400{degrees}C and 425{degrees}C was investigated. The critical temperatures of a suite of petroleum- and coal-derived jet fuels were measured by a rapidly heating sealed tube method. Work has continued on refining the measurements of deposit growth for stressing mixtures of coal-derived JP-8C with tetradecane. Current work has given emphasis to the initial stages of fuel decomposition and the onset of deposition. Pretreatment of JPTS fuel with PX-21 activated carbon (50 mg of PX-21 in 15 mL JPTS) delayed …
Date:
December 1, 1993
Creator:
Schobert, H. H.; Eser, S.; Song, C.; Hatcher, P. G.; Walsh, P. M. & Coleman, M. M.
Object Type:
Report
System:
The UNT Digital Library
Advanced turbine systems program conceptual design and product development. Quarterly report, August 1993--November 1994
This report discusses a series of heat balance programs were developed and reviewed in a Westinghouse Engineering Department meeting. The cycle formats were reviewed and candidate conditions and components selected for additional investigations,for the selection of the Natural Gas-fired Advanced Turbines Systems (GFATS).
Date:
December 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced Turbine Technology (ATTAP) Applications Project. 1992 Annual report
ATTAP activities during the past year included reference powertrain design (RPD) updates, test-bed engine design and development, ceramic component design, materials and component characterization, ceramic component development and fabrication, ceramic component rig testing, and test-bed engine fabrication and testing. RPD revisions included updating the baseline vehicle as well as the turbine RPD. Comparison of major performance parameters shows that the turbine engine installation exceeds critical fuel economy, emissions, and performance goals, and meets overall ATTAP objectives.
Date:
December 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The AFTAC model integration project: An annual progress report. Revision 1
The EXPRESS and ADPIC models have been designed to assist emergency personnel in their response to radiological accidents. Closure on the development of an operational version of the HADPIC Modeling System (HMS), a multi-faceted application that supports the hemispheric ADPIC (HADPIC) atmospheric dispersion model on a Sun workstation, was achieved toward the end of the fiscal year. The fulfilling tasks over the period encompassed by this report included: (1) the generation of software for calculating average concentrations at arbitrary locations in the model domain and displaying isopleths of concentration and (2) the comprehensive testing of major components of the HMS using IEEE standards. Scientists for Lawrence Livermore National Laboratory and the Institute of Experimental Meteorology in Obninsk, Russia, extensively evaluated their respective models (ADPIC/U.S. and EXPRESS/Russia) using perfluorocarbon tracer data from the Across North America Tracer Experiment (ANATEX). The results of both models are reported here because of the useful insights they provide regarding limits of performance as a function of model sophistication and the quality of the input meteorology.
Date:
December 1, 1993
Creator:
Rodriguez, D. J. & Moore, R. M.
Object Type:
Report
System:
The UNT Digital Library
The Age, Volume [14], Number 12, December 1993
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:
December 1993
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Allen American (Allen, Tex.), Vol. 23, No. 199, Ed. 1 Wednesday, December 1, 1993
Semiweekly newspaper from Allen, Texas that includes local, state, and national news along with advertising.
Date:
December 1, 1993
Creator:
Epperson, Wayne
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 93, No. 225, Ed. 1 Wednesday, December 1, 1993
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 1, 1993
Creator:
Lomenick, Rick
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, December 1, 1993
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 1, 1993
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Amorphous/crystalline structure and phase transformations in metastable semiconducting Ge{sub 1{minus}x}Sn{sub x}
The semiconducting crystalline alloys, Ge{sub 1{minus}x}Sn{sub x}, are of interest due to theoretical predictions about their electronic band structures which make them useful in infrared photodetectors. However the composition region where these alloys have the desired properties is greater than the equilibrium solid solubility limit of Sn in Ge (x {le} 0.01). The authors have circumvented the solubility limits and produced thin (2,000 {angstrom}) and thick (4--8 {mu}m) films of Ge{sub 1{minus}x}Sn{sub x} (x {le} 0.31) by rf sputtering. Differential scanning calorimetry (DSC) measurements were performed to study grain growth and crystallization processes in these highly metastable semiconductors. X-ray and electron diffraction measurements indicated the materials were amorphous, but the fact that some of the films were fine grained polycrystalline samples only became apparent in their DSC spectra. The authors present models that describe quantitatively the transformation behavior in both sets of films.
Date:
December 1, 1993
Creator:
Lee, S. M. & Barmak, K.
Object Type:
Report
System:
The UNT Digital Library