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Degree Department
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Year
Month
Appraisal Practices of Texas School Districts and Counties: 1994
Annual statistical report documenting assessment rations for school districts to provide taxpayers with information to determine the equity of their properties and to assist local officials who are evaluating their taxing system.
Date:
April 1994
Creator:
Texas Research League
Object Type:
Report
System:
The Portal to Texas History
Approximate flavor symmetries
We discuss the idea of approximate flavor symmetries. Relations between approximate flavor symmetries and natural flavor conservation and democracy models is explored. Implications for neutrino physics are also discussed.
Date:
April 1, 1994
Creator:
Rasin, A.
Object Type:
Article
System:
The UNT Digital Library
Archaeological Inventory Research Design, Kapoho, Kama 'ili & Kilauea Geothermal Resource Subzones, Puna District, Hawaii Island (DRAFT)
This report is a draft version of the Archaeological Inventory Research Design, Kapoho, Kama 'ili & Kilauea Geothermal Resource Subzones, Puna District, Hawaii Island
Date:
April 1, 1994
Creator:
Burtchard, Greg C.
Object Type:
Report
System:
The UNT Digital Library
An artificial neural network system for diagnosing gas turbine engine fuel faults
The US Army Ordnance Center & School and Pacific Northwest Laboratories are developing a turbine engine diagnostic system for the M1A1 Abrams tank. This system employs Artificial Neural Network (AN) technology to perform diagnosis and prognosis of the tank`s AGT-1500 gas turbine engine. This paper describes the design and prototype development of the ANN component of the diagnostic system, which we refer to as ``TEDANN`` for Turbine Engine Diagnostic Artificial Neural Networks.
Date:
April 1994
Creator:
Illi, O. J., Jr.; Greitzer, F. L.; Kangas, L. J. & Reeve, T.
Object Type:
Article
System:
The UNT Digital Library
Assessment of combustion and related issues in the DWPF and ITP waste tanks
This report presents a review of the safety analyses described in the DWPF Safety Analysis Report, the combustion analysis of the ITP Tanks 48 and 49, and presents conclusions drawn from interviews staff on issues related to accident analysis, in particular on issues related to combustion phenomena. The major objectives of this report are to clarify the issues related to the modes of combustion and expected loads on process vessels and structures and, in addition, to offer recommendations which would improve the defense-in-depth posture of the DWPF.
Date:
April 1, 1994
Creator:
Ginsberg, T.
Object Type:
Report
System:
The UNT Digital Library
The Assessment of Future Human Actions at Radioactive Waste Disposal Sites: An international perspective
For some deep geological disposal systems, the level of confinement provided by the natural and engineered barriers is considered to be so high that the greatest long-term risks associated with waste disposal may arise from the possibility of future human actions breaching the natural and/or engineered barrier systems. Following a Workshop in 1989, the OECD Nuclear Energy Agency established a Working Group on Assessment of Future Human Actions (FHA) a Radioactive Waste Disposal Sites. This Group met four times in the period 1991--1993, and has extensively reviewed approaches to and experience of incorporating the effects of FHA into long-term performance assessments (PAs). The Working Group`s report reviews the main issues concerning the treatment of FHA, presents a general framework for the quantitative, consideration of FHA in radioactive waste disposal programmes, and discusses means in reduce the risks associated with FHA. The Working Group concluded that FHA must be considered in PAs, although FHA where the actors were cognizant of the risks could be ignored. Credit can be taken for no more than several hundred years of active site control; additional efforts should therefore be taken to reduce the risks associated with FHA. International agreement on principles for the construction of …
Date:
April 1, 1994
Creator:
Anderson, D. R.; Galson, D. A. & Patera, E. S.
Object Type:
Article
System:
The UNT Digital Library
An assessment of research and development leadership in ocean energy technologies
Japan is clearly the leader in ocean energy technologies. The United Kingdom also has had many ocean energy research projects, but unlike Japan, most of the British projects have not progressed from the feasibility study stage to the demonstration stage. Federally funded ocean energy research in the US was stopped because it was perceived the technologies could not compete with conventional sources of fuel. Despite the probable small market for ocean energy technologies, the short sighted viewpoint of the US government regarding funding of these technologies may be harmful to US economic competitiveness. The technologies may have important uses in other applications, such as offshore construction and oil and gas drilling. Discontinuing the research and development of these technologies may cause the US to lose knowledge and miss market opportunities. If the US wishes to maintain its knowledge base and a market presence for ocean energy technologies, it may wish to consider entering into a cooperative agreement with Japan and/or the United Kingdom. Cooperative agreements are beneficial not only for technology transfer but also for cost-sharing.
Date:
April 1, 1994
Creator:
Bruch, V. L.
Object Type:
Report
System:
The UNT Digital Library
Assessment of research needs for advanced heterogeneous catalysts for energy applications. Final report: Volume 1, Executive summary
This report assesses the direction, technical content, and priority of research needs judged to provide the best chance of yielding new and improved heterogeneous catalysts for energy-related applications over a period of 5--20 years. It addresses issues of energy conservation, alternate fuels and feedstocks, and the economics and applications that could alleviate pollution from energy processes. Recommended goals are defined in 3 major, closely linked research thrusts: catalytic science, environmental protection by catalysis, and industrial catalytic applications. This volume provides a comprehensive executive summary, including research recommendations.
Date:
April 1, 1994
Creator:
Mills, G. A.
Object Type:
Report
System:
The UNT Digital Library
Assessment of research needs for advanced heterogeneous catalysts for energy applications. Final report: Volume 2, Topic reports
This report assesses the direction, technical content, and priority of research needs judged to provide the best chance of yielding new and improved heterogeneous catalysts for energy-related applications over the period of 5-20 years. It addresses issues of energy conservation, alternate fuels and feedstocks, and the economics and applications that could alleviate pollution from energy processes. Recommended goals are defined in 3 research thrusts: catalytic science, environmental protection by catalysis, and industrial catalytic applications. This study was conducted by an 11-member panel of experts from industry and academia, including one each from Japan and Europe. This volume first presents an in-depth overview of the role of catalysis in future energy technology in chapter 1; then current catalytic research is critically reviewed and research recommended in 8 topic chapters: catalyst preparation (design and synthesis), catalyst characterization (structure/function), catalyst performance testing, reaction kinetics/reactor design, catalysis for industrial chemicals, catalysis for electrical applications (clean fuels, pollution remediation), catalysis for control of exhaust emissions, and catalysts for liquid transportation fuels from petroleum, coal, residual oil, and biomass.
Date:
April 1, 1994
Creator:
Mills, G. A.
Object Type:
Report
System:
The UNT Digital Library
Assessment of the Flow-Survival Relationship Obtained by Sims and Ossiander (1981) for Snake River Spring/Summer Chinook Salmon Smolts, Final Report.
There has been much debate recently among fisheries professionals over the data and functional relationships used by Sims and Ossiander to describe the effects of flow in the Snake River on the survival and travel time of chinook salmon and steelhead smolts. The relationships were based on mark and recovery experiments conducted at various Snake and Columbia River sites between 1964 and 1979 to evaluate the effects of dams and flow regulation on the migratory characteristic`s chinook sa mon and steelhead trout smolts. The reliability of this information is crucial because it forms the logical basis for many of the flow management options being considered today to protect,upriver populations of chinook salmon and steelhead trout. In this paper I evaluate the primary data, assumptions, and calculations that underlie the flow-survival relationship derived by Sims and Ossiander (1981) for chinook salmon smolts.
Date:
April 1, 1994
Creator:
Steward, C. R. (Cleveland R.)
Object Type:
Report
System:
The UNT Digital Library
He atom-surface scattering: Surface dynamics of insulators, overlayers and crystal growth. Progress report, May 1, 1991--April 30, 1994
This progress report describes work carried out in the study of surface structure and dynamics of ionic insulators, the microscopic interactions controlling epitaxial growth and the formation of overlayers, and energy exchange in multiphonon surface scattering. The approach used is to employ high resolution helium atom scattering to study the geometry and structural features of the surfaces. Experiments have been carried out on the surface dynamics of RbCl and preliminary studies done on CoO and NiO. Epitaxial growth and overlayer dynamics experiments on the systems NaCl/NaCl(001), KBr/NaCl(001), NaCl/KBr(001) and KBr/RbCl(001) have been performed. They have collaborated with two theoretical groups to explore models of overlayer dynamics with which to compare and to interpret their experimental results. They have carried out extensive experiments on the multiphonon scattering of helium atoms from NaCl and, particularly, LiF. Work has begun on self-assembling organic films on gold and silver surfaces (alkyl thiols/Au(111) and Ag(111)).
Date:
April 1, 1994
Creator:
Safron, S. A. & Skofronick, J. G.
Object Type:
Report
System:
The UNT Digital Library
Attack of superheater tube alloys, coatings, and claddings by coal-ash corrosion
Twenty stainless steels, nickel alloys, claddings, and intermetallics have been evaluated for resistance to coal-ash attack. Six series of test conducted to determine effects of two gas and three ash compositions at 650 and 700C (1202 and 1292F) for times up to 800 hours.
Date:
April 1, 1994
Creator:
Van Weele, S.; Blough, J. L. & DeVan, J. H.
Object Type:
Article
System:
The UNT Digital Library
Automated surface flaw inspection. Final report
A study was conducted by Battelle Pacific Northwest Laboratories (PNL) to evaluate the feasibility of automating surface flaw inspection for squib valve housings manufactured at Allied Signal Inc., Kansas City Division (KCD). A borescope/video camera system was developed that was at least equal to the current KCD method in sensitivity to surface flaws. However, the images from this system were not found to be of high enough quality to allow automatic video processing for product acceptance. PNL proposed a three-phase process to further develop automation of this inspection, with the final result being either a partially or fully automated system, depending on the success of the image refinement and software development.
Date:
April 1, 1994
Creator:
Van Sooy, J. B.
Object Type:
Report
System:
The UNT Digital Library
Availability of direct normal radiation for solar furnace processing: A case study
Predicting the availability of direct normal solar radiation is important for scheduling tests and estimating economics of solar furnaces. This paper looks at historical hourly average direct normal data to predict seasonal trends and report historical availability. Data collected at the Solar Radiation Research Laboratory (SRRL), located within 100 meters of the National Renewable Energy Laboratory`s, (NREL`s) High-Flux Solar Furnace (HFSF), are analyzed to determine availability of the furnace for testing and processing samples. The design of NREL`s solar furnace allows considerable flexibility in processing samples under solar radiation levels of 100--1100 W/m{sup 2}. Flux levels of 1--2000 W/cm{sup 2} can be delivered and controlled. Different processes pose different requirements for both incident flux and time. The historical data for this site show how often the hourly average direct normal solar radiation is above a certain threshold over the period 1981--1992. Results also show how many tests could have been completed (or samples processed) using five-minute data from 1992. Effects of Mt. Pinatubo are also assessed.
Date:
April 1, 1994
Creator:
Bingham, C. E.
Object Type:
Article
System:
The UNT Digital Library
Balancing radiation benefits and risks: The needs of an informed public
The American public`s perceptions regarding ionizing radiation do not always conform to or correlate with scientific evidence. The ultimate purpose of this coordinated Federal effort and report is to increase the public`s knowledge of the benefits and risks associated with ionizing radiation. This report is divided into five sections. The first section, Introduction, discusses the public`s knowledge of radiation, their perceptions of benefits versus risks, and the Federal government`s role in public education. The section also outlines the charge to the Subpanel. Radiation Issues and Public Reactions discusses several radiation issues important to Federal agencies for which public education programs need to be established or enhanced. Federal Programs describes Federal agencies with public education programs on radiation and the nature of the programs they support. Education Issues and Federal Strategies explores the elements identified by the Subpanel as critical to the development and implementation of an effective Federal program in the area of public education on radiation issues and nuclear technologies. An important issue repeatedly brought up during the public sector presentations to the Subpanel was the perceived lack of Federal credibility on radiation issues in the eyes of the public. To some degree, this concern was factored into all …
Date:
April 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Baseline Risk Assessment of Ground Water Contamination at the Uranium Mill Tailings Site Near Shiprock, New Mexico. Revision 1
This baseline risk assessment at the former uranium mill tailings site near Shiprock, New Mexico, evaluates the potential impact to public health or the environment resulting from ground water contamination at the former uranium mill processing site. The tailings and other contaminated material at this site were placed in an on-site disposal cell in 1986 through the US Department of Energy (DOE) Uranium Mill Tailings Remedial Action (UMTRA) Project. Currently, the UMTRA Project is evaluating ground water contamination. This risk assessment is the first document specific to this site for the Ground Water Project. There are no domestic or drinking water wells in the contaminated ground water of the two distinct ground water units: the contaminated ground water in the San Juan River floodplain alluvium below the site and the contaminated ground water in the terrace alluvium area where the disposal cell is located. Because no one is drinking the affected ground water, there are currently no health or environmental risks directly associated with the contaminated ground water. However, there is a potential for humans, domestic animals, and wildlife to the exposed to surface expressions of ground water in the seeps and pools in the area of the San Juan …
Date:
April 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Baseline Risk Assessment of Groundwater Contamination at the Uranium Mill Tailings Site Near Gunnison, Colorado. Revision 1
This report evaluates potential impacts to public health or the environment resulting from groundwater contamination at the former uranium mill processing site. The tailings and other contaminated material at this site are being placed in an off-site disposal cell by the US Department of Energy`s (DOE) Uranium Mill Tailings Remedial Action (UMTRA) Project. Currently, the UMTRA Project is evaluating groundwater contamination. This is the second risk assessment of groundwater contamination at this site. The first risk assessment was performed primarily to evaluate existing domestic wells to determine the potential for immediate human health and environmental impacts. This risk assessment evaluates the most contaminated groundwater that flows beneath the processing site towards the Gunnison River. The monitor wells that have consistently shown the highest concentration of most contaminants are used in this risk assessment. This risk assessment will be used in conjunction with additional activities and documents to assist in determining what remedial action is needed for contaminated groundwater at the site after the tailings are relocated. This risk assessment follows an approach outlined by the US Environmental Protection Agency (EPA). The first step is to evaluate groundwater data collected from monitor wells at the site. Evaluation of these data showed …
Date:
April 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Basis for seismic provisions of DOE-STD-1020
DOE-STD-1020 provides for a graded approach for the seismic design and evaluation of DOE structures, systems, and components (SSC). Each SSC is assigned to a Performance Category (PC) with a performance description and an approximate annual probability of seismic-induced unacceptable performance, P{sub F}. The seismic annual probability performance goals for PC 1 through 4 for which specific seismic design and evaluation criteria are presented. DOE-STD-1020 also provides a seismic design and evaluation procedure applicable to achieve any seismic performance goal annual probability of unacceptable performance specified by the user. The desired seismic performance goal is achieved by defining the seismic hazard in terms of a site-specified design/evaluation response spectrum (called herein, the Design/Evaluation Basis Earthquake, DBE). Probabilistic seismic hazard estimates are used to establish the DBE. The resulting seismic hazard curves define the amplitude of the ground motion as a function of the annual probability of exceedance P{sub H} of the specified seismic hazard. Once the DBE is defined, the SSC is designed or evaluated for this DBE using adequately conservative deterministic acceptance criteria. To be adequately conservative, the acceptance criteria must introduce an additional reduction in the risk of unacceptable performance below the annual risk of exceeding the DBE. …
Date:
April 1, 1994
Creator:
Kennedy, R. C. & Short, S. A.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 72, No. 131, Ed. 1 Friday, April 1, 1994
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 1, 1994
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
Bed material agglomeration during fluidized bed combustion. Technical progress report, January 1, 1994--March 31, 1994
Laboratory combustion tests conducted this quarter support the hypothesis that localized reducing conditions promote formation of agglomerates in the bed of fluidized bed boilers. These tests were designed to simulate localized reducing conditions found in commercial fluidized bed combustors. Localized reducing conditions may occur from either poor lateral bed mixing or oxygen-starved bed conditions due to the coal feed configuration. It was found-that agglomeration can occur at lower theoretical air values while operating temperatures are within the range of fluidized bed boilers. Cohesion of bed particles appears to take place very rapidly when theoretical air in the bed approaches 70%. These tests also indicate that bed temperature, pressure drop, oxygen and carbon dioxide concentrations are affected by agglomeration. Agglomeration appears to result in: (1) An increase in the frequency of pressure fluctuations (bed pressure drop). (2) An increase in the magnitude of pressure fluctuations (bed pressure drop.) (3) A possible decrease in bed pressure differential over time. In addition, there appears to be an increase in the amount of available oxygen and a decrease in CO{sub 2}. Agglomerates formed in the laboratory are being subjected to mineralogical analyses which will then be compared to similar analyses of agglomerates removed from …
Date:
April 1, 1994
Creator:
Brown, R. C.; Dawson, M. R. & Smeenk, J. L.
Object Type:
Report
System:
The UNT Digital Library
Bench-scale demonstration of hot-gas desulfurization technology. Quarterly technical progress report, October 1--December 31, 1993
Research Triangle Institute (RTI) with DOE/METC sponsorship has been developing zinc titanate sorbent technology since 1986. In addition, RTI has been developing the Direct Sulfur Recovery Process (DSRP) with DOE/METC sponsorship since 1988. Fluidized-bed zinc titanate desulfurization coupled to the DSRP is currently the most advanced and attractive technology for sulfur removal/recovery for IGCC systems, and it has recently been proposed in a Clean Coal Technology project. The goal of this project is to continue further development of the zinc titanate desulfurization and DSRP technologies by: scaling up the zinc titanate reactor system; developing an integrated skid-mounted zinc titanate desulfurization-DSRP reactor system; testing the integrated system over an extended period with real coal-gas from an operating gasifier to quantify the degradative effect, if any, of the trace contaminants present in coal gas; developing an engineering database suitable for system scaleup; and designing, fabricating and commissioning a larger DSRP reactor system capable of operating on a six-fold greater volume of gas than the DSRP reactor used in the bench-scale field test. During this reporting period the Construction Permit Application was completed and approved by the Process Safety Committee, and a final revised Application has been submitted to DOE/METC. A draft Test …
Date:
April 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Biaxial loading and shallow-flaw effects on crack-tip constraint and fracture-toughness
Uniaxial tests of single-edged notched bend (SENB) specimens with both deep- and shallow-flaws have shown elevated fracturetoughness for the shallow flaws. The elevation in fracture-toughness for shallow flaws has been shown to be the result of reduced constraint at the crack-tip. Biaxial loading has the potential to increase constraint at the crack-tip and thereby reduce some of the shallow-flaw, fracture-toughness elevation. Biaxial fracture-toughness tests have shown that the shallow-flaw, fracture-toughness elevation is reduced but not eliminated by biaxial loading. Dual-parameter, fracture-toughness correlations have been proposed to reflect the effect of crack-tip constraint on fracture-toughness. Test results from the uniaxial and biaxial tests were analyzed using the dual-parameter technology. Discrepancies between analysis results and cleavage initiation site data from fractographic examinations indicate that the analysis models are in need of further refinement. Addition of a precleavage, ductile-tearing element to the analysis model has the potential to resolve the noted discrepancies.
Date:
April 1, 1994
Creator:
Pennell, W. E.; Bass, B. R.; Bryson, J. W.; McAfee, W. J.; Theiss, T. J. & Rao, M. C.
Object Type:
Article
System:
The UNT Digital Library
Biointrusion test plan for the Permanent Isolation Surface Barrier Prototype
This document provides a testing and monitoring plan for the biological component of the prototype barrier slated for construction at the Hanford Site. The prototype barrier is an aboveground structure engineered to demonstrate the basic features of an earthen cover system. It is designed to permanently isolate waste from the biosphere. The features of the barrier include multiple layers of soil and rock materials and a low-permeability asphalt sublayer. The surface of the barrier consists of silt loam soil, covered with plants. The barrier sides are reinforced with rock or coarse earthen-fill to protect against wind and water erosion. The sublayers inhibit plant and animal intrusion and percolation of water. A series of tests will be conducted on the prototype barrier over the next several years to evaluate barrier performance under extreme climatic conditions. Plants and animals will play a significant role in the hydrologic and water and wind erosion characteristics of the prototype barrier. Studies on the biological component of the prototype barrier will include work on the initial revegetation of the surface, continued monitoring of the developing plant community, rooting depth and dispersion in the context of biointrusion potential, the role of plants in the hydrology of the …
Date:
April 1, 1994
Creator:
Link, S. O.; Cadwell, L. L.; Brandt, C. A.; Downs, J. L.; Rossi, R. E. & Gee, G. W.
Object Type:
Report
System:
The UNT Digital Library
The Boerne Village Band, Past and Present
A history of the Boerne Village Band, a local band in Boerne, Texas, founded by Karl Dienger. The paper also explores Dienger's background, documents changes to the band, and provides dates for future performances.
Date:
April 1994
Creator:
Schelfrahn, Rudolf R.
Object Type:
Paper
System:
The Portal to Texas History