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Cure Kinetics and Processing Parameters of Neat and Reinforced High Performance Epoxy Resins: Evaluation of Techniques

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Kinetic equation parameters for the curing reaction of a commercial glass fiber reinforced high performance epoxy prepreg composed of the tetrafunctional epoxy tetraglycidyl 4,4-diaminodiphenyl methane (TGDDM), the tetrafunctional amine curing agent 4,4’-diaminodiphenylsulfone (DDS) and an ionic initiator/accelerator, are determined by various thermal analysis techniques and the results compared. The reaction is monitored by heat generated determined by differential scanning calorimetry (DSC). The changes in physical properties indicating increasing conversion are followed by shifts in glass transition temperature determined by DSC and temperature-modulated DSC (TMDSC), thermomechanical (TMA) and dynamic mechanical (DMA) analysis and thermally stimulated depolarization (TSD). Changes in viscosity, also indicative of degree of conversion, are monitored by DMA. Thermal stability as a function of degree of cure is monitored by thermogravimetric analysis (TGA). The parameters of the general kinetic equations, including activation energy and rate constant, are explained and used to compare results of various techniques. The utilities of the kinetic descriptions are demonstrated in the construction of a useful time-temperature-transformation (TTT) diagram for rapid determination of processing parameters in the processing of prepregs. Copyright is held by the author, unless otherwise noted. All rights reserved. Files: Thesis.pdf Special Conditions
Date: December 1999
Creator: Bilyeu, Bryan
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Symmetrical Features of Nikolai Medtner's Language: The Grzovaya Sonata, Opus 53 No. 2

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Nikolai Medtner's works evidence an intense interest in symmetrical designs. This concern is manifest at all levels, from the large scale proportions of his numerous ingenious sonata forms to the symmetrically constructed themes and motives. Medtner's works include several instances of palindromic themes and periods. Some palindromic contours are achieved through immediate inversion, creating expansive, symmetrical waves. One of Medtner's thumbprints, symmetrical contrary voice-leading, consists of two or more voices which systematically expand or contract in exact mirror fashion. The contrary movement is usually stepwise, and may be either chromatic or diatonic. Occasionally even larger intervals, such as thirds and fourths, are subjected to this favourite mirroring technique. Such symmetrical expansion and contraction often controls the harmonic progression of several consecutive bars. One of the most striking aspects of Medtner's music is his sophisticated harmonic language. He was fascinated with symmetrical harmonic designs, such as the tritone, the French sixth chord, and the octatonic scale, and made endless and increasingly intricate explorations into these stuctures and the ways in which these apparently nontonal, non-hierarchical forms could be coordinated with the fundamental hierarchy of asymmetrical tonal forms, including triads, major and minor scales, and tonic-dominant relations. Medtner's late work, the Grozovaya …
Date: December 1999
Creator: Pitts, James L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

The Afro-British Slave Narrative: The Rhetoric of Freedom in the Kairos of Abolition

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The dissertation argues that the development of the British abolition movement was based on the abolitionists' perception that their actions were kairotic; they attempted to shape their own kairos by taking temporal events and reinterpreting them to construct a kairotic process that led to a perceived fulfillment: abolition. Thus, the dissertation examines the rhetorical strategies used by white abolitionists to construct an abolitionist kairos that was designed to produce salvation for white Britons more than it was to help free blacks. The dissertation especially examines the three major texts produced by black persons living in England during the late eighteenth centuryIgnatius Sancho's Letters of the Late Ignatius Sancho (1782), Ottobauh Cugoano's Thoughts and Sentiments on the Evil of Slavery (1787), and Olaudah Equiano's The Interesting Narrative of the Life of Olaudah Equiano, or Gustavus Vassa, the African (1789)to illustrate how black rhetoric was appropriated by whites to fulfill their own kairotic desires. By examining the rhetorical strategies employed in both white and black rhetorics, the dissertation illustrates how the abolitionists thought the movement was shaped by, and how they were shaping the movement through, kairotic time. While the dissertation contends that the abolition movement was rhetorically designed to provide redemption, …
Date: December 1999
Creator: Evans, Dennis F.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

A Qualitative Study of the Use and Value of Financial Performance Indicators in Selected Community Colleges in the State of Texas as Perceived by their Chief Executive Officers

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Throughout the United States, colleges and universities are faced with an increasing need for financial funding, while at the same time resources continue to diminish. With the limitations of available funds, community colleges must exhibit efficiencies in the operations of their institutions. External interests, such as governing boards and legislatures, require demonstration of efficient financial management. This evidence is then used to make decisions concerning future financial support for the community college. This study determined if community college chief executive officers use financial performance indicators as provided by the State Auditor's Office and if the chief executive officers of the community colleges value the compilation and the distribution of the financial performance indicators. In the selected colleges, many of the chief executive officers depend on their chief financial officer for understanding and application of financial performance indicators. The performance indicators distributed by the Auditor's Office captured only a snapshot of the college's performance, and failed to fully describe the whole college performance or specific financial events captured by the indicators. Though the indicators had flaws, either through incorrect data or lack of explanation, the CEOs did value their compilation because they provided a means for ‘getting the community college story' …
Date: December 1999
Creator: Hase, Karla Luan Neeley
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Hospitality Students' Attitudes and Behavioral Intentions toward Learning and Using Computer Technology

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Following Ajzen/Fishbein's 1980 Theory of Reasoned Action, influences of hospitality students' external variables (age, gender, university classification, and work experience) on computer attitudes, and relationships between computer attitudes and intentions to learn and use computers were tested. A sample of 412 hospitality students completed two measurements: Loyd/Gressard's 1984 Computer Attitude Scale, and Behavioral Intentions to Learn and Use Computers. Males and females had positive computer attitudes. Graduates had more positive computer attitudes. No interaction effect existed between gender and classification. No relationships existed between age and work experience on computer attitudes. Computer attitudes positively correlated with intentions to learn and use computers. Results supported the Theory of Reasoned Action. External variables partially influence attitudes and attitudes influence intentions.
Date: December 1999
Creator: Chuvessiriporn, Suttichai
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Development of a Coaxiality Indicator

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The geometric dimensioning and tolerancing concept of coaxiality is often required by design engineers for balance of rotating parts and precision mating parts. In current practice, it is difficult for manufacturers to measure coaxiality quickly and inexpensively. This study examines feasibility of a manually-operated, mechanical device combined with formulae to indicate coaxiality of a test specimen. The author designs, fabricates, and tests the system for measuring coaxiality of holes machined in a steel test piece. Gage Repeatability and Reproducibility (gage R&R) and univariate analysis of variance is performed in accordance with Measurement System Analysis published by AIAG. Results indicate significant design flaws exist in the current configuration of the device; observed values vary greatly with operator technique. Suggestions for device improvements conclude the research.
Date: December 1999
Creator: Arendsee, Wayne C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Techniques of Sensual Perception: The Creation of Emotional Pathways

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Some artists strive to create artwork that has aesthetic value. If a piece of artwork has the ability to capture the attention of an audience, it must contain strong sensual attributes. Thus, understanding how to design an art form to contain strong sensual attributes may increase the possibility of an aesthetic experience. Since aesthetics is an experience of sensations perceived when in contact with a creative form in any artistic discipline, it is necessary for an artist to understand the nature of the sensual experience. In understanding the sensual experience, artists may be able to create techniques to enhance the aesthetic experience of their work. My video piece, entitled Ararat is a study of methods to enhance the sensual experience. I hope to accomplish this by means of using techniques that optimize an audience's perceptual experience.
Date: December 1999
Creator: Henry, Jon L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Personality Characteristics of Counselor Education Graduate Students as Measured by the Myers-Briggs Type Indicator and the Bem Sex Role Inventory

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This study was designed to investigate the correlation of the variables of gender, Myers-Briggs Type Indicator (MBTI) personality preferences, and androgyny as measured by the Bem Sex Role Inventory (BSRI) in Counselor Education graduate students. Instruments were administered to Counselor Education graduate students at nine institutions in five national regions. A total of 172 participants (18 males and 154 females) who were enrolled in Master's level theories courses or practicum courses completed a student information sheet, informed consent, MBTI, and BSRI. Instruments were hand scored and chi-square test was used to determine significance of the hypotheses; the saturated model of log linear analysis was the statistic used for the research question. As predicted, of the sixteen MBTI types, the most common for Counselor Education graduate students emerged as ENFP: extraversion, intuition, feeling, and perception. Additionally, this MBTI type was found to be significantly more common among the population of Counselor Education graduate students than is found among the general population. The expectation that more male Counselor Education graduate students would score higher on the androgyny scale of the BSRI was unsupported; low sample size for male Counselor Education graduate students prevented use of chi-square; however, it was apparent through the …
Date: December 1999
Creator: VanPelt-Tess, Pamela
Object Type: Thesis or Dissertation
System: The UNT Digital Library

A Sensory Tour of Cape Cod: Thoreau's Transcendental Journey to Spiritual Renewal

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Predominantly darker than his other works, Cape Cod depicts Henry David Thoreau's interpretation of life as a struggle for survival and a search for salvation in a stark New England setting. Representing Thoreau's greatest test of the goodness of God and nature, the book illustrates the centrality of the subject of death to Thoreau's philosophy of life. Contending that Thoreau's journey to the Cape originated from an intensely personal transcendental impulse connected with his brother's death, this study provides the first in-depth examination of Thoreau's use of the five senses in Cape Cod to reveal both the eccentricities inherent in his relationship with nature and his method of resolving his fears of mortality. Some of the sense impressions in Cape Cod--particularly those that center around human death and those that involve tactile sensations--suggest that Thoreau sometimes tried to master his fears by subconsciously altering painful historical facts or by avoiding the type of sensual contact that aggravated the repressed guilt he suffered from his brother's death. Despite his personal idiosyncrasies, however, Thoreau persisted in his search for truth, and the written record of his journey in Cape Cod documents how his dedication to the transcendental process enabled him to surmount …
Date: December 1999
Creator: Talley, Sharon
Object Type: Thesis or Dissertation
System: The UNT Digital Library

A Descriptive Study of Students Who Were Accepted for Admission at West Texas A&M University But Did Not Enroll

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Each year, institutions of higher education devote valuable financial and personnel resources in the hope of enhancing student recruitment and matriculation. The purpose of this study was to examine the demographic characteristics, the factors that influenced students’ decisions to apply for admission to a university, their educational intentions, and their reasons for not enrolling after they had been admitted. The subjects of the study were first-time freshmen accepted for admission to a mid-size, public, southwestern university who did not enroll for the fall 1997 semester. Statistically significant differences were found when comparing no-shows and enrolled students by gender, ethnicity, age, ACT/SAT score, and distance of their hometown from the university. There were more female no-shows, and more males enrolled than females; a greater percentage of no-shows reported the distance of their hometown to be more than 200 miles; and the mean test score for no-shows was higher. Factors important in the college selection process found to be statistically significant among the groups were: a greater percentage of Minorities than Caucasians reported the importance of the financial aid award or a scholarship offer; students living within 100 miles of the campus reported the proximity of the university as important, advice received …
Date: December 1999
Creator: Barton, Mary Edna
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Environmental Ethics, Volume 12, Number 1, Spring 1990

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Quarterly publication discussing various topics in environmental ethics, including features, discussion papers, book reviews, editorial commentaries, and other text related to environmental philosophies. Some issues also include announcements and other news related to the environmental studies community.
Date: 1990
Creator: The Center for Environmental Philosophy
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Environmental Ethics, Volume 14, Number 2, Summer 1992

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Quarterly publication discussing various topics in environmental ethics, including features, discussion papers, book reviews, editorial commentaries, and other text related to environmental philosophies. Some issues also include announcements and other news related to the environmental studies community.
Date: 1992
Creator: The Center for Environmental Philosophy
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Environmental Ethics, Volume 14, Number 1, Spring 1992

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Quarterly publication discussing various topics in environmental ethics, including features, discussion papers, book reviews, editorial commentaries, and other text related to environmental philosophies. Some issues also include announcements and other news related to the environmental studies community.
Date: 1992
Creator: John Muir Institute for Environmental Studies
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Environmental Ethics, Volume 13, Number 2, Summer 1991

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Quarterly publication discussing various topics in environmental ethics, including features, discussion papers, book reviews, editorial commentaries, and other text related to environmental philosophies. Some issues also include announcements and other news related to the environmental studies community.
Date: 1991
Creator: Environmental Philosophy, Inc.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Environmental Ethics, Volume 14, Number 3, Fall 1992

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Quarterly publication discussing various topics in environmental ethics, including features, discussion papers, book reviews, editorial commentaries, and other text related to environmental philosophies. Some issues also include announcements and other news related to the environmental studies community.
Date: 1992
Creator: The Center for Environmental Philosophy
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Environmental Ethics, Volume 14, Number 4, Winter 1992

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Quarterly publication discussing various topics in environmental ethics, including features, discussion papers, book reviews, editorial commentaries, and other text related to environmental philosophies. Some issues also include announcements and other news related to the environmental studies community.
Date: 1992
Creator: The Center for Environmental Philosophy
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Environmental Ethics, Volume 12, Number 3, Fall 1990

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Quarterly publication discussing various topics in environmental ethics, including features, discussion papers, book reviews, editorial commentaries, and other text related to environmental philosophies. Some issues also include announcements and other news related to the environmental studies community.
Date: 1990
Creator: The Center for Environmental Philosophy
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Faculty Recital: 1998-02-02 - Woodwind Faculty Recital

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A faculty recital performed at the UNT College of Music Recital Hall.
Date: February 2, 1998
Creator: Sundberg, Terri; Veazey, Charles; Gillespie, James; Scott, John C. (John Charles), 1947-; Reynolds, Kathleen & Scharnberg, William
Object Type: Sound
System: The UNT Digital Library

Faculty Recital: 1998-07-01 - Bradetich/Borodin Trio

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A faculty chamber music recital performed at the UNT College of Music Recital Hall.
Date: July 1, 1998
Creator: Borodin, Igor; Bradetich, Jeff & Bradetich, Judi Rockey
Object Type: Sound
System: The UNT Digital Library

Guest Artist Recital: 1998-10-17 - David Friesen, double bass with UNT Jazz Faculty

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Jazz concert performed at the UNT College of Music Kenton Hall.
Date: October 17, 1998
Creator: Friesen, David; Hamilton, Fred & Soph, Ed
Object Type: Sound
System: The UNT Digital Library

Faculty Recital: 1998-12-02 - Terri Sundberg, flute

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A faculty and guest artist recital performed at the UNT College of Music Recital Hall.
Date: December 2, 1998
Creator: Sundberg, Terri
Object Type: Sound
System: The UNT Digital Library

Faculty Recital: 1999-01-28 - Igor Borodin, violin

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A faculty recital performed at the UNT College of Music Recital Hall.
Date: January 28, 1999
Creator: Borodin, Igor
Object Type: Sound
System: The UNT Digital Library

Guest Artist Recital: 1999-02-25 - The Adkins String Ensemble

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Guest string ensemble concert performed at the UNT College of Music Winspear Hall.
Date: February 25, 1999
Creator: The Adkins String Ensemble
Object Type: Sound
System: The UNT Digital Library

Faculty Recital: 1999-03-01 - Jeff Bradetich, double bass

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A faculty recital performed at the UNT College of Music Winspear Hall.
Date: March 1, 1999
Creator: Bradetich, Jeff
Object Type: Sound
System: The UNT Digital Library