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A Comparison of Analytical Approaches for Wellbore Heat Transmission in Layered Formations
This report presents an analytical method for determining wellbore heat transmission during liquid or gas flow along the tubing. The mathematical model describes the heat transfer between the flowing fluid in the wellbore and in the surrounding formation as one whole physical system. The transient heat transfer equations in the two regions with coupling at the sandface are solved simultaneously. Non-homogeneous formations are treated which consist of several layers with different physical properties and arbitrary initial temperature distributions in the vertical direction. Closed form analytical solutions are obtained in real space and in Laplace space, which can be used to calculate the temperature distribution along the wellbore and in the formation, and to evaluate heat transfer rate and cumulative heat exchange between wellbore and formation. A more accurate formula is given for the widely-used transient heat conduction function f(t{sub D}) of thermal resistance. 14 refs., 12 figs., 1 tab.
Date:
August 1, 1988
Creator:
Wu, Yu-Shu
Object Type:
Report
System:
The UNT Digital Library
A comparison of the conductor requirements for energy storage devices made with ideal coil geometries
Superconducting Magnetic Energy Storage (SMES) plants have been proposed in both solenoidal and toroidal geometries. The former is efficient in terms of the quantity of superconductor required per unit of stored energy. For applications where a fringe field could be a problem, the toroidal geometry, which requires at least a factor of two more material, has been proposed. In addition to the solenoid and toroid, other geometries are possible, such as linear multipoles and spherical coils. These geometries have been considered for use in applications other than energy storage. In this report, the effectiveness (quantity of superconductor/stored energy) is calculated for various coil geometries. 7 refs., 4 tabs.
Date:
August 1, 1988
Creator:
Hassenzahl, W.
Object Type:
Article
System:
The UNT Digital Library
A Comparison of Three Item Selection Methods in Criterion-Referenced Tests
This study compared three methods of selecting the best discriminating test items and the resultant test reliability of mastery/nonmastery classifications. These three methods were (a) the agreement approach, (b) the phi coefficient approach, and (c) the random selection approach. Test responses from 1,836 students on a 50-item physical science test were used, from which 90 distinct data sets were generated for analysis. These 90 data sets contained 10 replications of the combination of three different sample sizes (75, 150, and 300) and three different numbers of test items (15, 25, and 35). The results of this study indicated that the agreement approach was an appropriate method to be used for selecting criterion-referenced test items at the classroom level, while the phi coefficient approach was an appropriate method to be used at the district and/or state levels. The random selection method did not have similar characteristics in selecting test items and produced the lowest reliabilities, when compared with the agreement and the phi coefficient approaches.
Date:
August 1988
Creator:
Lin, Hui-Fen
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Computer-aided methods of determining thyristor thermal transients
An accurate tracing of the thyristor thermal response is investigated. This paper offers several alternatives for thermal modeling and analysis by using an electrical circuit analog: topological method, convolution integral method, etc. These methods are adaptable to numerical solutions and well suited to the use of the digital computer. The thermal analysis of thyristors was performed for the 1000 MVA converter system at the Princeton Plasma Physics Laboratory. Transient thermal impedance curves for individual thyristors in a given cooling arrangement were known from measurements and from manufacturer's data. The analysis pertains to almost any loading case, and the results are obtained in a numerical or a graphical format. 6 refs., 9 figs.
Date:
August 1, 1988
Creator:
Lu, E. & Bronner, G.
Object Type:
Report
System:
The UNT Digital Library
Computer Realization of Human Music Cognition
This study models the human process of music cognition on the digital computer. The definition of music cognition is derived from the work in music cognition done by the researchers Carol Krumhansl and Edward Kessler, and by Mari Jones, as well as from the music theories of Heinrich Schenker. The computer implementation functions in three stages. First, it translates a musical "performance" in the form of MIDI (Musical Instrument Digital Interface) messages into LISP structures. Second, the various parameters of the performance are examined separately a la Jones's joint accent structure, quantified according to psychological findings, and adjusted to a common scale. The findings of Krumhansl and Kessler are used to evaluate the consonance of each note with respect to the key of the piece and with respect to the immediately sounding harmony. This process yields a multidimensional set of points, each of which is a cognitive evaluation of a single musical event within the context of the piece of music within which it occurred. This set of points forms a metric space in multi-dimensional Euclidean space. The third phase of the analysis maps the set of points into a topology-preserving data structure for a Schenkerian-like middleground structural analysis. This …
Date:
August 1988
Creator:
Albright, Larry E. (Larry Eugene)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Considerations against a force compensated coil
The cost of structural components in a large superconducting coil may well exceed the coil and cryostat cost. As a result, the idea of constructing a system composed of two different coil types assembled in such a way that the sources balance and reduce the total structural requirement is oft proposed. A suitable geometry has never been found for the fundamental reason that there can be no force compensated solution. In this paper, the general problem is presented and an analysis of the energy stored and stresses produced in the structure are described in a fundamental way. Finally, the relation between structural mass M and stored energy E, M greater than or equal to/rho/E/sigma/sub w/, that is valid for all magnetic systems is developed, where /rho/ is the density of the structure and sigma/sub w/ is the working stress in the structure. 12 refs., 2 figs.
Date:
August 1, 1988
Creator:
Hassenzahl, W.
Object Type:
Article
System:
The UNT Digital Library
Considerations Against a Force Compensated Coil
The cost of structural components in a large superconducting coil may well exceed the coil and cryostat cost. As a result, the idea of constructing a system composed of two different coil types assembled in such a way that the forces balance and reduce the total structural requirement is oft proposed. A suitable geometry has never been found for the fundamental reason that there can be no force compensated solution. In this paper, the general problem is presented and an analysis of the energy stored and stresses produced in the structure are described in a fundamental way. Finally, the relation between structural mass M and stored energy E, M {ge} {rho}E/{sigma}{sub w}, that is valid for all, magnetic systems is developed, where {rho} is the density of the structure and {sigma}{sub w} is the working stress in the structure.
Date:
August 1, 1988
Creator:
Hassenzahl, W.
Object Type:
Article
System:
The UNT Digital Library
Considerations against a force compensated coil
The cost of structural components in a large superconducting coil may well exceed the coil and cryostat cost. As a result, the idea of constructing a system composed of two different coil types assembled in such a way that the forces balance and reduce the total structural requirement is oft proposed. A suitable geometry has never been found for the fundamental reason that there can be no force compensated solution. In this paper, the general problem is presented and an analysis of the energy stored and stresses produced in the structure are described in a fundamental way. Finally, the relation between structural mass M and stored energy E, M greater than or equal to /rho/E/sigma/sub w/, that is valid for all magnetic systems is developed, where /rho/ is the density of the structure and sigma/sub w/ is the working stress in the structure. 8 refs., 2 figs.
Date:
August 1, 1988
Creator:
Hassenzahl, W.
Object Type:
Article
System:
The UNT Digital Library
Coring in deep hardrock formations
The United States Department of Energy is involved in a variety of scientific and engineering feasibility studies requiring extensive drilling in hard crystalline rock. In many cases well depths extend from 6000 to 20,000 feet in high-temperature, granitic formations. Examples of such projects are the Hot Dry Rock well system at Fenton Hill, New Mexico and the planned exploratory magma well near Mammoth Lakes, California. In addition to these programs, there is also continuing interest in supporting programs to reduce drilling costs associated with the production of geothermal energy from underground sources such as the Geysers area near San Francisco, California. The overall progression in these efforts is to drill deeper holes in higher temperature, harder formations. In conjunction with this trend is a desire to improve the capability to recover geological information. Spot coring and continuous coring are important elements in this effort. It is the purpose of this report to examine the current methods used to obtain core from deep wells and to suggest projects which will improve existing capabilities. 28 refs., 8 figs., 2 tabs.
Date:
August 1, 1988
Creator:
Drumheller, D.S.
Object Type:
Report
System:
The UNT Digital Library
Corporate Tax Rates and the Purchasing Power Parity Doctrine
This thesis analyzes the effect of corporate tax rates on the purchasing-power-parity (PPP) doctrine. The data used to test this hypothesis are drawn from the U. S., the U. K., the Federal Republic of Germany, Canada, and Japan. The first chapter introduces the reader to the concepts of the PPP doctrine and states the hypothesis. Chapter 2 reviews the literature on the PPP doctrine. Chapter 3 specifies a model of the PPP doctrine including tax rates. Chapter 4 reports and interprets the findings. The study is summarized and conclusions are drawn in chapter 5. In this study it is shown that tax rates are significant only in the case of the U. S. dollar/Canadian dollar exchange rate.
Date:
August 1988
Creator:
Ballard, Billy L. (Billy Lanoy)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Corrections to charge exchange spectroscopic measurements in TFTR due to energy-dependent excitation rates
The use of charge exchange spectrocopy to determine plasma rotation speeds and ion temperature is complicated by the energy dependence of the excitation cross sections. The Doppler-broadened spectral line shape is distorted by the relative velocity between the neutral hydrogen atoms of the injected beam and impurity ions. The asymmetric nature of the energy dependence of this cross section causes a non-motional shift of the line center and a non-thermal change in the line width. These effects vary with the angles between the beam direction, rotation velocity direction, and direction of the viewing sightline. When viewing two neutral beams at different angles on TFTR, the two measurements of v/sub phi/(r) show discrepancies about 20 to 30% with each other. The calculation of the spectral intensity profiles, using the excitation rates available, overcorrects these discrepancies and indicates the need for better excitation coefficients. 10 refs., 5 figs.
Date:
August 1, 1988
Creator:
Howell, R.B.; Fonck, R.J.; Knize, R.J. & Jaehnig, K.P.
Object Type:
Report
System:
The UNT Digital Library
Criticality experiments with mixed oxide fuel pin arrays in plutonium-uranium nitrate solution
A series of critical experiments was completed with mixed plutonium-uranium solutions having a Pu/(Pu + U) ratio of approximately 0.22 in a boiler tube-type lattice assembly. These experiments were conducted as part of the Criticality Data Development Program between the United States Department of Energy (USDOE) and the Power Reactor and Nuclear Fuel Development Corporation (PNC) of Japan. A complete description of the experiments and data are included in this report. The experiments were performed with an array of mixed oxide fuel pins in aqueous plutonium-uranium solutions. The fuel pins were contained in a boiler tube-type tank and arranged in a 1.4 cm square pitch array which resembled cylindrical geometry. One experiment was perfomed with the fuel pins removed from the vessel. The experiments were performed with a water reflector. The concentration of the solutions in the boiler tube-type tank was varied from 4 to 468 g (Pu + U)/liter. The ratio of plutonium to total heavy metal (plutonium plus uranium) was approximately 0.22 for all experiments.
Date:
August 1, 1988
Creator:
Lloyd, R.C. (Pacific Northwest Lab., Richland, WA (United States)) & Smolen, G.R. (Oak Ridge National Lab., TN (United States))
Object Type:
Report
System:
The UNT Digital Library
Cross-Cultural Validity of the Test of Non-Verbal Intelligence
The purpose of this study was to investigate the extent to which a non-verbal test of intelligence, the Test of Non-Verbal Intelligence (TONI), may be used for assessing intellectual abilities of children in India. This investigation is considered important since current instruments used in India were developed several years ago and do not adequately reflect present standards of performance. Further, current instruments do not demonstrate adequate validity, as procedures for development and cultural transport were frequently not in adherence to recommended guidelines for such practice. Data were collected from 91 normally achieving and 18 mentally retarded Indian children, currently enrolled in elementary schools. Data from an American comparison group were procured from the authors of the TONI. Subjects were matched on age, grade, and area of residence. Subjects were also from comparative socioeconomic backgrounds. Literature review of the theoretical framework supporting cross-cultural measurement of intellectual ability, a summary of major instruments developed for cross-cultural use, non-verbal measures of intellectual ability in India, and issues in cross-cultural research are discussed, with recommended methodology for test transport. Major findings are: (a) the factor scales derived from the Indian and American normally achieving groups indicate significant differences; (b) items 1, 3, 5, 8, …
Date:
August 1988
Creator:
Parmar, Rene S. (Rene Sumangala)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Cross Section, Volume 34, Number 8, August 1988
Monthly newsletter of the High Plains Underground Water Conservation District No. 1, discussing the field of underground water. Topics include profiles of water conservation research, annual pre-plant soil moisture survey data, annual Winter Water Level measurement data, and information about the latest water conservation tips.
Date:
August 1988
Creator:
High Plains Underground Water Conservation District No. 1 (Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Current cost and performance requirements for residential cool storage systems
This study defines the current cost and performance requirements for residential cool storage technologies based on the characteristics of conventional air conditioning equipment and residential time-of-day (TOD) rate structures existing during the 1986--1987 time frame. Currently, rate structures are changing rapidly. Given the volatility of rate structures, the establishment of cost goal is challenging. The goals presented in this study are based on the utility rate structure as of 1986. This study serves to define residential cool storage cost and performance requirements in the current economic environment as well as the many issues affecting the requirements for residential cool storage systems both now and in the future. The same methodology can be employed to establish long-run goals once future rate structures are adequately defined. 12 refs., 6 figs., 18 tabs.
Date:
August 1, 1988
Creator:
Brown, D. R. & Spanner, G. E.
Object Type:
Report
System:
The UNT Digital Library
A database of PFT ventilation measurements
About five years ago, a method for measuring the ventilation flows of a building was developed at Brookhaven National Laboratory (BNL). This method is based on the use of a family of compounds known as perfluorocarbon tracers or PFTs. Since 1982, BNL has measured ventilation in more than 4000 homes, comprising about 100 separate research projects throughout the world. This measurement set is unique in that it is the only set of ventilation measurements that acknowledge and measure the multizone characteristics of residences. Other large measurement sets assume that a home can be treated as a single well-mixed zone. This report describes the creation of a database of approximately half of the PFT ventilation measurements made by BNL over the last five years. The PFT database is currently available for use on any IBM PC or Apple Macintosh based personal computer system. In addition to its utility in modeling indoor pollutant dispersion, this database may also be useful to those people studying energy conservation, thermal comfort and heating system design in residential buildings. 2 refs.
Date:
August 1, 1988
Creator:
D'Ottavio, T. W.; Goodrich, R. W.; Spandau, D. J. & Dietz, R. N.
Object Type:
Report
System:
The UNT Digital Library
The Decline of the Country-House Poem in England: A Study in the History of Ideas
This study discusses the evolution of the English country-house poem from its inception by Ben Jonson in "To Penshurst" to the present. It shows that in addition to stylistic and thematic borrowings primarily from Horace and Martial, traditional English values associated with the great hall and comitatus ideal helped define features of the English country-house poem, to which Jonson added the metonymical use of architecture. In the Jonsonian country-house poem, the country estate, exemplified by Penshurst, is a microcosm of the ideal English social organization characterized by interdependence, simplicity, service, hospitality, and balance between the active and contemplative life. Those poems which depart from the Jonsonian ideal are characterized by disequilibrium between the active and contemplative life, resulting in the predominance of artifice, subordination of nature, and isolation of art from the community, as exemplified by Thomas Carew's "To Saxham" and Richard Lovelace's "Amyntor's Grove." Architectural features of the English country house are examined to explain the absence of the Jonsonian country-house poem in the eighteenth century. The building tradition praised by Jonson gradually gave way to aesthetic considerations fostered by the professional architect and Palladian architecture, architectural patronage by the middle class, and change in identity of the country …
Date:
August 1988
Creator:
Harris, Candice R. (Candice Rae)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Derivation of Probability Density Functions for the Relative Differences in the Standard and Poor's 100 Stock Index Over Various Intervals of Time
In this study a two-part mixed probability density function was derived which described the relative changes in the Standard and Poor's 100 Stock Index over various intervals of time. The density function is a mixture of two different halves of normal distributions. Optimal values for the standard deviations for the two halves and the mean are given. Also, a general form of the function is given which uses linear regression models to estimate the standard deviations and the means. The density functions allow stock market participants trading index options and futures contracts on the S & P 100 Stock Index to determine probabilities of success or failure of trades involving price movements of certain magnitudes in given lengths of time.
Date:
August 1988
Creator:
Bunger, R. C. (Robert Charles)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Description of the Northwest hazardous waste site data base and preliminary analysis of site characteristics
The Northwest Hazardous Waste RD and D Center (the Center) conducts research, development, and demonstration (RD and D) activities for hazardous and radioactive mixed-waste technologies applicable to remediating sites in the states of Idaho, Montana, Oregon, and Washington. To properly set priorities for these RD and D activities and to target development efforts it is necessary to understand the nature of the sites requiring remediation. A data base of hazardous waste site characteristics has been constructed to facilitate this analysis. The data base used data from EPA's Region X Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS) and from Preliminary Assessment/Site Investigation (PA/SI) forms for sites in Montana. The Center's data base focuses on two sets of sites--those on the National Priorities List (NPL) and other sites that are denoted as ''active'' CERCLIS sites. Active CERCLIS sites are those sites that are undergoing active investigation and analysis. The data base contains information for each site covering site identification and location, type of industry associated with the site, waste categories present (e.g., heavy metals, pesticides, etc.), methods of disposal (e.g., tanks, drums, land, etc.), waste forms (e.g., liquid, solid, etc.), and hazard targets (e.g., surface water, groundwater, etc.). As part …
Date:
August 1, 1988
Creator:
Woodruff, D. L.; Hartz, K. E. & Triplett, M. B.
Object Type:
Report
System:
The UNT Digital Library
Design of Studies for Development of BPA Fish and Wildlife Mitigation Accounting Policy Phase II, Volume I, 1985-1988 Summary Report.
As the mitigation prescribed by the Regional Act proceeds, the incremental costs of corrective measures to lessen the environmental impacts of the hydroelectric system are expected to increase and difficult questions to arise about the costs, effectiveness, and justification of alternative measures and their systemwide implications. It was deemed prudent by the BPA to anticipate this situation by launching a forward-looking research program aimed at providing methodological tools and data suitable for estimating the productivity and cost implications of mitigation alternatives in a timely manner with state-of-the-art accuracy. In this spirit, Resources for the Future (RFF) agreed at the request of the BPA to develop a research program which would provide an analytical system designed to assist the BPA Administrator and other interested and responsible parties in evaluating the ecological and economic aspects of alternative protection, enhancement, and mitigation measures. 12 refs., 4 figs., 1 tab.
Date:
August 1, 1988
Creator:
Kneese, Allen V.
Object Type:
Report
System:
The UNT Digital Library
Design of Studies for Development of BPA Fish and Wildlife Mitigation Accounting Policy Phase II, Volume II, 1985-1988 Technical Report.
The incremental costs of corrective measures to lessen the environmental impacts of the hydroelectric system are expected to increase and difficult questions to arise about the costs, effectiveness, and justification of alternative measures and their systemwide implications. The BPA anticipate this situation by launching a forward-looking research program aimed at providing methodological tools and data suitable for estimating the productivity and cost implications of mitigation alternatives in a timely manner with state-of-the-art accuracy. Resources for the Future (RFF) agreed at the request of the BPA to develop a research program which would provide an analytical system designed to assist the BPA Administrator and other interested and responsible parties in evaluating the ecological and economic aspects of alternative protection, enhancement, and mitigation measures. While this progression from an ecological understanding to cost-effectiveness analyses is straightforward in concept, the complexities of the Columbia River system make the development of analytical methods far from simple in practice. The Phase 2 final report outlines the technical issues involved in developing an analytical system and proposes a program of research to address these issues. The report is presented in the Summary Report (Volume 1), and the present volume which consists of three technical reports: Part …
Date:
August 1, 1988
Creator:
Kneese, Allen V.
Object Type:
Report
System:
The UNT Digital Library
Detector Comparison for Simultaneous Determination of Organic Acids and Inorganic Anions
The research reported here is a study of detector systems to determine those most suited for simultaneous organic acid, inorganic anion determination. Comparisons are made on the basis of detection limits and sensitivities for conductivity, UV/Vis, photoconductivity, and derivative conductivity detection systems. The investigation was made using a constant chromatographic system with the only variable component being the detector system. Eluant optimization conditions for each detector are reported along with tables reporting detection limits and sensitivities for each detector system. Various chromatograms are also shown to provide a visual comparison between detector results.
Date:
August 1988
Creator:
Pannell, Daniel K. (Daniel Kirk)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Development of ferritic steels for fusion reactor applications
Chromium-molybdenum ferritic (martensitic) steels are leading candidates for the structural components for future fusion reactors. However, irradiation of such steels in a fusion environment will produce long-lived radioactive isotopes that will lead to difficult waste-disposal problems. Such problems could be reduced by replacing the elements in the steels (i.e., Mo, Nb, Ni, N, and Cu) that lead to long-lived radioactive isotopes. We have proposed the development of ferritic steels analogous to conventional Cr-Mo steels, which contain molybdenum and niobium. It is proposed that molybdenum be replaced by tungsten and niobium be replaced by tantalum. Eight experimental steels were produced. Chromium concentrations of 2.25, 5, 9, and 12% were used (all concentrations are in wt %). Steels with these chromium compositions, each containing 2% W and 0.25% V, were produced. To determine the effect of tungsten and vanadium, 2.25 Cr steels were produced with 2% W and no vanadium and with 0.25% V and O and 1% W. A 9Cr steel containing 2% W, 0.25 V, and 0.07% Ta was also studied. For all alloys, carbon was maintained at 0.1%. Tempering studies on the normalized steels indicated that the tempering behavior of the new Cr-W steels was similar to that of …
Date:
August 1, 1988
Creator:
Klueh, R. L.; Maziasz, P. J. & Corwin, W. R.
Object Type:
Report
System:
The UNT Digital Library
DGS Newsletter, Number 106, August 1988
Newsletter of the Dallas Genealogical Society discussing membership, Society meetings, genealogical workshops and events, and other news of interest to members.
Date:
August 1988
Creator:
Dallas Genealogical Society
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History