Month

92 Matching Results

Results open in a new window/tab.

Transcendence and Paradox: A Question of Female and Male (open access)

Transcendence and Paradox: A Question of Female and Male

For the problem in lieu of thesis, a series of ten works were created in which a male image replaced the female image; I continued to utilize the same materials, format, and centralized frontal figure. A record of the work was accomplished by maintaining a written and visual journal on progress and outcome. Some research was made into topics related to the work, and the findings from the literature comprise chapter two of the paper. In executing this body of work and researching related topics, I hoped to better understand my conscious and unconscious processes and motivations in creating both the self-portrait series and the new series.
Date: May 1991
Creator: Bennett, Karen M.
System: The UNT Digital Library
Industrial Materials and Fiber Techniques in Environmental Sculpture (open access)

Industrial Materials and Fiber Techniques in Environmental Sculpture

There are three recurrent themes in my work: 1) environmental installations utilizing ecologically unsound materials 2) incorporating air space with plastics 3) conceptual inspiration derived from dreams. I proposed to address these three themes by employing materials traditionally used for industrial applications (as in plumbing supplies and dry-cleaning bags) as fine arts media using fiber related techniques in environmental sculptural pieces.
Date: May 1991
Creator: Maus-Simpson, Marcia
System: The UNT Digital Library
An Investigation of the Effects of Color and Line on Sculptural Forms (open access)

An Investigation of the Effects of Color and Line on Sculptural Forms

The purpose for this study was to investigate the effect of painting and drawing when used as an integral part of sculptural form. The following questions are addressed in this study: 1. Does color increase or decrease the three-dimensionality of a form? 2. When used, is color an integral part of the sculptural form or a superficial decoration? 3. Can drawn line (on the sculpture's surface) be used to flatten or deny the sculptural form? 4. Can drawn line be useful in describing or enhancing sculptural forms?
Date: May 1991
Creator: Hinz, Timothy W.
System: The UNT Digital Library
The strong reactions of Lewis-base noble-metals with vanadium and other acidic transition metals (open access)

The strong reactions of Lewis-base noble-metals with vanadium and other acidic transition metals

The noble metals often thought of as unreactive solids,react strongly with nearly 40% of the elements in the periodictable: group IIIB-VB transition metals, lanthanides, theactinides, and group IIIA-IVA non-transition metals. These strong reactions arise from increased bonding/electron transfer fromnonbonding electrons d electron pairs on the noble metal tovacant orbitals on V, etc. This effect is a generalized Lewis acid-base interaction. The partial Gibbs energy of V in the noblemetals has been measured as a function of concentration at a temperature near 1000C. Thermodynamics of the intermetallics are determined by ternary oxide equilibria, ternary carbide equilibria, and the high-temperature galvanic cell technique. These experimental methods use equilibrated solid composite mixtures in which grains of V oxides or of V carbides are interspersed with grains of V-NM(noble-metal) alloys. In equilibrium the activity of V in the oxide or the carbide equals the activity in the alloy. Consequently, the thermodynamics available in the literature for the V oxides and V carbides are reviewed. Test runs on the galvanic cell were attempted. The V oxide electrode reacts with CaF{sub 2}, ThO{sub 2}, YDT(0.85ThO{sub 2}-0.15YO{sub 1.5}), and LDT(0.85ThO{sub 2}- 0.15LaO{sub 1.5}) to interfere with the measured data observed toward the beginning of a galvanic cell …
Date: May 1, 1991
Creator: Ebbinghaus, B. B.
System: The UNT Digital Library
Merlin Classifier System (open access)

Merlin Classifier System

There is a natural tendency for biological systems to change as their environments change. The fittest in the biological systems survive, adapt to their environment, and multiply while the weakest in the environment diminish. There have been attempts in computer science to model the processes of natural selection and survival which occur in biological systems in order to obtain more efficient and effective machine-learning algorithms. Genetic algorithms are the result of these attempts.
Date: May 1991
Creator: Pantermuehl, Brenda N.
System: The UNT Digital Library
A two-photon fluorescence autocorrelator for a Nd:YLF modelocked laser (open access)

A two-photon fluorescence autocorrelator for a Nd:YLF modelocked laser

In this thesis, I discuss the design and implementation of an autocorrelator for an actively modelocked ND:YLF laser at wavelength 1.054{mu}m. A dye is used to generate a broadband two-photon fluorescence (TPF) signal at 570nm which is the autocorrelation of the laser pulses. Two different techniques are discussed. A colliding pulse scheme can be used to generate a TPF autocorrelation signal as a function of distance, or an interferometer technique can be used to generate an autocorrelation signal as a function of the delay in an interferometer arm. Experimental results are discussed, but they are inconclusive because of difficulties in interpreting the signal.
Date: May 1, 1991
Creator: Kner, Peter Alexander
System: The UNT Digital Library
Quaternary tectonics and basin history of Pahrump and Stewart Valleys, Nevada and California (open access)

Quaternary tectonics and basin history of Pahrump and Stewart Valleys, Nevada and California

The Pahrump fault system is an active fault system located in Pahrump and Stewart Valleys, Nevada and California, in the southern part of the Basin and Range Province. This system is 50 km long by 30 km wide and is comprised of three fault zones: the right-lateral East Nopah fault zone, the right-oblique Pahrump Valley fault zone, and the normal West Spring Mountains fault zone. All three zones have geomorphic evidence for late Quaternary activity. Analysis of active fault patterns and seismic reflection lines suggests that the Pahrump basin has had a two-stage genesis, an early history associated with a period of low angle detachment faulting probably active 10-15 Ma, and a more recent history related to the present dextral shear system, probably active post-4 Ma.
Date: May 1, 1991
Creator: Hoffard, Joanne L.
System: The UNT Digital Library
Capacitance of edge plane of pyrolytic graphite in acetonitrile solutions (open access)

Capacitance of edge plane of pyrolytic graphite in acetonitrile solutions

The capacitance of the edge plane of pyrolytic graphite electrodes, in acetonitrile solutions, is measured by recording the current response to an applied triangular voltage sweep; TVS, and then fitting the current response with an appropriate function, (via a set of adjustable parameters). The pretreatment of the electrodes, the supporting electrolyte concentration used, and the frequency of the input TVS, were all found to affect the measured capacitance. In these experiments, a background current was also seen and the shape of the current output for the TVS; the charging/discharging curve, is shown to correlate with the magnitude of this background current. In addition, the size of the background current was found to have some dependence on the type of electrode pretreatment procedure used. 60 refs., 49 figs., 3 tabs.
Date: May 1, 1991
Creator: Minick, S. K. & Ishida, Takanobu
System: The UNT Digital Library
Model heterogeneous acid catalysts and metal-support interactions: A combined surface science and catalysis study (open access)

Model heterogeneous acid catalysts and metal-support interactions: A combined surface science and catalysis study

This (<100 {Angstrom}) silica-alumina layers were tested as potential model heterogeneous acid catalysts for combined surface science and catalysis studies. Three preparation methods were used: oxidation of r3 {times} r3 R30 Al/Si(111) structure in UHV; deposition on Si(lll) from aqueous solution; and argon ion beam sputter deposition in UHV. The homogeneous thin layers are amorphous, and the chemical environment of surface atoms is similar to that of Si, Al and oxygen atoms on high surface area acid catalysts. Since the ion beam-deposited thin layer of silica-alumina has the same composition as the target zeolite this deposition method is a promising tool to prepare model catalysts using practical catalyst targets. The silica-alumina layers are active in cumene cracking, a typical acid catalyzed reaction. In order to clearly distinguish background reactions and the acid catalyzed reaction at least 20 cm{sup 2} catalyst surface area is needed. Two series of model platinum-alumina catalysts were prepared in a combined UHV -- high pressure reactor cell apparatus by depositing alumina on polycrystalline Pt foil and by vapor depositing Pt on a thin alumina layer on Au. Both model surfaces have been prepared with and without chlorine. AES, CO desorption as well as methyl cyclopentane (MCP) …
Date: May 1, 1991
Creator: Boszormenyi, I.
System: The UNT Digital Library
Continuous profiling of magnetotelluric fields (open access)

Continuous profiling of magnetotelluric fields

The magnetotelluric (MT) method of mapping ground electrical conductivity is traditionally based on measurement of the surface impedance at widely spaced stations to infer models of the subsurface through a suitable pseudo 1-D inverse or with linearized least-squares inversion for 2- or 3-D geoelectric media. It is well known that small near-surface inhomogeneities can produce spatial discontinuities in the measured electric fields over a wide frequency range and may consequently bias the impedance on a very local scale. Inadequate station spacing effectively aliases the electric field measurements and results in distortions that cannot be removed in subsequent processing or modelling. In order to fully exploit the benefits of magnetotellurics in complex geological environments, closely spaced measurements must be used routinely. This thesis entertains an analysis of MT data taken along continuous profiles and is a first step that will allow more encompassing 2-D sampling techniques to become viable in the years to come. The developments presented here are to a large extent motivated by the physical insight gained from low-contrast solutions to the forward MT problem. These solutions describe the relationship between a perturbation in the electrical conductivity of the subsurface and the ensuing perturbation of the MT response as …
Date: May 1, 1991
Creator: Verdin, C. T.
System: The UNT Digital Library
Preparation of polymer-modified electrodes: A literature and experimental study (open access)

Preparation of polymer-modified electrodes: A literature and experimental study

A literature review is presented on the field of polymer modified electrodes which can be electrochemically generated. It is suggested that a possible application of these polymer modified electrodes is as a regeneratable catalysis packing material for use in couter-current exchange columns. Secondly, there is a presentation of experimental results dealing with possible electrode modification using difluoro- and dimethyl- phenols and fluorinated derivatives of styrene, benzoquinone and hydroquinone. It appears that dimethylphenol shows the most potential of the monomers experimentally tested in providing a stable polymer modified electrode surface. 170 refs., 31 figs., 1 tab.
Date: May 1, 1991
Creator: Jayanta, P. S. & Ishida, Takanobu
System: The UNT Digital Library
Pathologies in Earthworms: Sublethal Biomarkers of Xenobiotic Toxicity (open access)

Pathologies in Earthworms: Sublethal Biomarkers of Xenobiotic Toxicity

This research is part of an overall program to develop and use a suite of acute and sublethal toxicity biomarkers, and testing protocols for use in assaying potential effects of complex mixtures of xenobiotics such as found in soils containing agricultural biocides and petrochemical wastes dredged sediments, and hazardous waste sites (HWS). The purpose of this study was to evaluate four biomarkers of sublethal pathology that could be used in an integrative model of multiple toxicity endpoints with the earthworm Lumbricus terrestris.
Date: May 1991
Creator: Cikutovic Salas, Marcos A.
System: The UNT Digital Library
In Vitro Studies of the Effects of Hypothermia on Lesioned and Uninjured Mammalian Spinal Cord Neurons (open access)

In Vitro Studies of the Effects of Hypothermia on Lesioned and Uninjured Mammalian Spinal Cord Neurons

The effects of hypothermia on cultured mammalian (mouse) spinal cord neurons which had been subjected to a defined physical trauma (amputation of a primary dendrite 100μM from the perikaryon) were investigated.
Date: May 1991
Creator: Wang, Guofang
System: The UNT Digital Library
Brain-Reactive Antibodies: Molecular Specificity and Relationship to Biological Aging (open access)

Brain-Reactive Antibodies: Molecular Specificity and Relationship to Biological Aging

Brain-reactive antibodies (BRA) increase in frequency with age in several mammalian species and may be involved in the pathogenesis of age-related dementia. In this experiment, the molecular specificity of BRA in mouse sera was determined using an immunoblot assay, and the relationship of BRA to longevity was studied by comparing the rate of formation of specific BRAs in diet restricted C57BL/6NNia, B6D2F1/NNia, and DBA/2NNia, genotypes which differ markedly in life-span.
Date: May 1991
Creator: Apte, Vaijayanti
System: The UNT Digital Library
Evaluation of the Efficacy of the Stress Protein Response as a Biochemical Water Quality Biomonitoring Method (open access)

Evaluation of the Efficacy of the Stress Protein Response as a Biochemical Water Quality Biomonitoring Method

The stress protein response (SPR) is a conserved and ubiquitous mechanism that enables cells to tolerate a wide variety of environmental insults. This response involves the preferential synthesis of an array of proteins with different molecular weights. These proteins perform a variety of functions, such as protein folding, multimeric protein assembly, steroid receptor binding, and heme catabolism. To evaluate the potential use of the SPR as a biomonitoring tool, a stepwise plan was utilized that proceeded through various physical and chemical laboratory exposures and culminated with a field validation study. The goals of the laboratory exposures were threefold: (1) determine the time required for induction of the SPR; (2) determine the dose-responsiveness of the SPR; and (3) compare the increased syntheses and accumulations of stress proteins to classical toxicological endpoints (i.e. percent mortality, LC50, LC1, etc).
Date: May 1991
Creator: Dyer, Scott Douglas
System: The UNT Digital Library
Neotectonics of the southern Amargosa Desert, Nye County, Nevada and Inyo County, California (open access)

Neotectonics of the southern Amargosa Desert, Nye County, Nevada and Inyo County, California

A complex pattern of active faults occurs in the southern Amargosa Desert, southern Nye, County, Nevada. These faults can be grouped into three main fault systems: (1) a NE-striking zone of faults that forms the southwest extension of the left-lateral Rock Valley fault zone, in the much larger Spotted Range-Mine Mountain structural zone, (2) a N-striking fault zone coinciding with a NNW-trending alignment of springs that is either a northward continuation of a fault along the west side of the Resting Spring Range or a N-striking branch fault of the Pahrump fault system, and (3) a NW-striking fault zone which is parallel to the Pahrump fault system, but is offset approximately 5 km with a left step in southern Ash Meadows. These three fault zones suggest extension is occurring in an E-W direction, which is compatible with the {approximately}N10W structural grain prevalent in the Death Valley extensional region to the west.
Date: May 1, 1991
Creator: Donovan, D.E.
System: The UNT Digital Library
Synthesis and 2-D NMR Analysis of a New Phenyl-Substituted Polycyclic Compound (open access)

Synthesis and 2-D NMR Analysis of a New Phenyl-Substituted Polycyclic Compound

Diels-Alder [4+2] cycloaddition of a mixture of 1- and 2 methylcyclopentadiene to 2-phenyl-g.-benzoquinone affords a mixture of four nd cycloadducts. A single, isomerically pure cycloadduct was isolated by careful column chromatography. Stereospecific reduction of this material with sodium borohydride and cerium(III) chloride 'affords a single, isomerically pure tricyclic diol. The structures of the cycloadduct and this tricyclic diol, established via analysis of their one- and two-dimensionial NMR spectra, were shown to be (1-methyl-5-phenyltricyclo[6.2.1.02,7]undec a-4,9 diene-3,6-dione and 1-methyl-5-phenyltricyclo[6.2.1.0 2 ,7 ]undeca-4,9-diene t.&A-3-=.a-6-diol), respectively. Intramolecular [2+2] photocyclization of this tricyclic diol afforded the corresponding cage diol, 3-methyl-7phenylpentacyclo[5.4.0.0 2 ,6 .03 , 1 0 .05, 9 ]undecane-.exogxa-8,11-diol. Oxidation of this cage diol with pyridinium chlorochromate in dry dichloromethane afforded a single, isomerically pure cage hydroxyketone, 3-methyl-7 phenylpentacyclo[5.4.02,6.03,l .1519]undecane-xA-8-ol-II-one, whose structure was established by single crystal X-ray crystallographic methods.
Date: May 1991
Creator: Tsay, Fuh-Rong
System: The UNT Digital Library
Owen Glendower and the Welsh Fight for Independence (open access)

Owen Glendower and the Welsh Fight for Independence

Owen Glendower led the last military struggle of the Welsh against the English crown for Welsh independence and nationalism. The failure of the Glendower rebellion established the supremacy of English rule over Wales. For six hundred years the status of Wales as a principality of the crown has not been seriously challenged. This paper will show how widespread the idea of "Welshness" was in 1400 and how much support existed for Wales as an independent nation. Welshmen sought to move from the status of a medieval, tribal principality to a position of an independent nation capable and ready to stand with other national in the world. The role of leadership that Owen Glendower assumed in the final rebellion against the English king, Henry IV, lifted him from a popular Welsh prince to an historical legend.
Date: May 1991
Creator: Beims, Phillip Eric
System: The UNT Digital Library
Whitman's Failures: "Children of Adam" in the Light of Feminist Ideals (open access)

Whitman's Failures: "Children of Adam" in the Light of Feminist Ideals

Walt Whitman was a feminist, and this assertion can be supported by excerpts from his prose, poetry, and conversation. Furthermore, the poet's circle of associates, chronology, and place of residence also lend credence to the hypothesis stating Whitman's subscription to feminist credos. A pro-feminine attitude is evident in much of Whitman's work, and his ties to the women's rights movement of the nineteenth century do influence the poet's portrayal of women. But the section of poems titled "Children of Adam" proves to be an anomaly in Walt Whitman's feminist attitudes. Instead of portraying women as equals, able to walk a path of equanimity with males, the women of "Children of Adam" are often obscured in linguistic veils or subjugated to the poet's Adamic rhetoric.
Date: May 1991
Creator: Brown, Bryce Dean
System: The UNT Digital Library
Job Rating and Satisfaction of Radio Station General Managers in the Institutional Climate of Deregulation (open access)

Job Rating and Satisfaction of Radio Station General Managers in the Institutional Climate of Deregulation

This study tested the job satisfaction of major market radio station general managers in the aftermath of deregulation. The study consisted of two phases, a quantitative, anonymous, mail survey utilizing the nationally recognized Job Descriptive Index (JDI); and a qualitative follow-up telephone interview. Of 246 general managers solicited, 144 returned usable JDI surveys. The JDI consisted of six separate scales, each measuring satisfaction on a different aspect of the job. The followup telephone interview comprised seven questions designed specifically to explore the effects of broadcast deregulation on the respondents. Two hypotheses were tested. The hypotheses tested for differences in job satisfaction scores between radio station general managers and the normative scores of individuals of similar education and job tenure in other industries. In most of the subscales tested there was no significant difference between the two groups. The qualitative telephone survey found widespread dissatisfaction with the effects of deregulation on the broadcast medium.
Date: May 1991
Creator: Loomis, Kenneth D. (Kenneth Dwight)
System: The UNT Digital Library
"Eyre," a Three Movement Instrumental Work for Small Chamber Ensemble (open access)

"Eyre," a Three Movement Instrumental Work for Small Chamber Ensemble

"Eyre" is a composition of approximately sixteen minutes duration for an instrumental ensemble consisting of two flutes, oboe, B𝄭 clarinet, bassoon, guitar, and cello. It is inspired by a large seasonal lake basin in South Australia of the same name. The piece is divided into three movements; the first is fast and quasi sonata-allegro form without the recapitulation; the second is slow and through-composed; and the third, essentially the missing recapitulation from the first movement. Much of the motivic material for the piece is derived from the initial progression of triads. Harmonic and melodic development of this material contains some modal tendencies. While the overall effect tends toward equal weighting of the instrumental forces, there is some featuring of the guitar and an interplay between the woodwind and string instruments.
Date: May 1991
Creator: Hodges, Glen J. (Glen John)
System: The UNT Digital Library
Circulatory and Respiratory Responses to Cycle Ergometry at Different Pedal Rates (open access)

Circulatory and Respiratory Responses to Cycle Ergometry at Different Pedal Rates

The effects of moderate workload exercise at different pedal rates on circulatory and respiratory parameters were studied. Five subjects performed seven discontinuous constant-load cycle ergometer tests of 30 minutes duration at pedal rates of 40, 50, 60, 70, 80, 90 and 100 rpm. Oxygen uptake and carbon dioxide production were determined by standard open circuit spirometry, while heart rate was recorded by electrocardiograph. The CO₂ rebreathing procedure was administered during the exercise bout in order to determine cardiac output. Blood pressure was determined for each test, and total peripheral resistance was calculated. The findings indicate that progressive increases in pedal frequency during discontinuous constant-load cycle ergometry produce progressive increases in cardiovascular, respiratory and metabolic responses and a decrease in gross exercise mechanical efficiency. The results indicate that oxygen uptake, cardiac output, heart rate, ventilation and arterial-venous oxygen difference increases curvilinearly as pedal rate increases, possibly as a result of increases in recruitment of muscle fibers and/or muscle groups. These findings suggest that circulatory and respiratory responses are due to "central command" which sets the basic efferent response pattern. However, this effector pattern is modulated by afferent input originating from the legs during progressive increases in pedal rate.
Date: May 1991
Creator: Hernandez, Raymundo
System: The UNT Digital Library
Computer Applications to Second Language Acquisition (open access)

Computer Applications to Second Language Acquisition

This thesis is intended to give a panorama of technology in foreign language pedagogy. Although my field of study is French, the computer applications under scrutiny do not relate solely to the teaching of French. This paper begins with a criticism of the rigid listen-and-repeat language laboratory concept while tracking the rise of communicative language learning theory; follows the microprocessor revolution in language consoles; documents the development of computer-assisted instruction; showcases software evaluations of computer-assisted language learning; explores telecommunications; discusses satellite dishes and other computer peripherals; presents the results of a survey of Texas universities; and concludes with the presentation of the evolving language media center.
Date: May 1991
Creator: Guillory, Helen E. (Helen Elizabeth)
System: The UNT Digital Library
Comparative Toxicity of Refuse-Derived Fuel Fly Ash on Two Species of Earthworms, Lumbricus terrestris and E. foetida, Using an Artificial Soil Exposure Protocol (open access)

Comparative Toxicity of Refuse-Derived Fuel Fly Ash on Two Species of Earthworms, Lumbricus terrestris and E. foetida, Using an Artificial Soil Exposure Protocol

Research estimated toxicity of refuse-derived fuel fly ash (RDF-FA) on two earthworms species, Lumbricus terrestris and Eisenia foetida. Specific objectives were to: (1) Compare their 14-day LC50s under light and dark conditions; (2) separate toxicity due to osmotic, pH and physical factors from that of heavy metal contaminants; (3) compare relative differences of artificial soil and commercial soil as exposure media for evaluating toxicity to earthworms. The 14-d LC50s for L. terrestris in dark and light were 57.0 and 48.34 % RDF-FA, and 59.25 and 41.00 % RDF-FA for E. foetida using artificial soil. All of the toxicity resulted from heavy metals within the RDF-FA. Using L. terrestris, the LC50s for artificial soil and commercial soil were 52.30 and 64.34%.
Date: May 1991
Creator: Jahani, Aghamolla
System: The UNT Digital Library