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Accelerated hygrothermal stabilization of composite materials
Experimentation validated a simple moisture conditioning scheme to prepare Gr/Ep composite parts for precision applications by measuring dimensional changes over 90 days. It was shown that an elevated temperature moisture conditioning scheme produced a dimensionally stable part from which precision structures could be built/machined without significant moisture induced dimensional changes after fabrication. Conversely, that unconditioned Gr/Ep composite panels exhibited unacceptably large dimensional changes (i.e., greater than 125 ppM). It was also shown that time required to produce stable parts was shorter, by more than an order of magnitude, employing the conditioning scheme than using no conditioning scheme (46 days versus 1000+ days). Two final use environments were chosen for the experiments: 50% RH/21C and 0% RH/21C. Fiberite 3034K was chosen for its widespread use in aerospace applications. Two typical lay-ups were chosen, one with low sensitivity to hygrothermal distortions and the other high sensitivity: [0, {plus_minus} 45, 90]s, [0, {plus_minus} 15, 0]s. By employing an elevated temperature, constant humidity conditioning scheme, test panels achieved an equilibrium moisture content in less time, by more than an order of magnitude, than panels exposed to the same humidity environment and ambient temperature. Dimensional changes, over 90 days, were up to 4 times lower …
Date:
May 1, 1994
Creator:
Gale, J. A.
System:
The UNT Digital Library
Accelerator Mass Spectrometry Studies of Highly Charged Molecular Ions
The existence of singly, doubly, and triply charged diatomic molecular ions was observed by using an Accelerator Mass Spectrometry (AMS) technique. The mean lifetimes of 3 MeV boron diatomic molecular ions were measured. No isotopic effects on the mean lifetimes of boron diatomic molecules were observed for charge state 3+. Also, the mean lifetime of SiF^3+ was measured.
Date:
December 1994
Creator:
Kim, Yong-Dal
System:
The UNT Digital Library
Accounting Measurement Bias and Executive Compensation Systems
This dissertation presents empirical evidence intended to help answer two research questions. The first question asks whether executive compensation systems appear to exploit the bias in accounting-based performance measures in order to reduce the volatility in executive compensation and to allocate incentives more effectively across the range of activities performed by the executive. The second question asks whether compensation systems systematically differ between firms that use alternative accounting methods and whether any such systematic difference helps explain accounting choice. Parameters estimated in fixed-effects endogenous switching regression models were used to test the risk-shielding and incentive-allocation hypotheses. The models were estimated across a dataset consisting of 1151 executive-year observations of annual compensation paid to 222 top-level executives in 40 oil and gas firms. The dataset was partitioned by accounting method and separate models estimated for the full cost and successful efforts partitions. The tests provided modest support for the risk-shielding and incentive-allocation hypotheses, revealing that accounting measurement bias is used to focus incentives for effort in the exploration activity and to reduce executives' exposure to production risk. The design also allowed an estimate of the proportional change in compensation that was realized from the accounting choice actually made.
Date:
December 1994
Creator:
Boone, Jeffery Paul
System:
The UNT Digital Library
Accounting Regulation and Information Asymmetry in the Capital Markets: An Empirical Study of Accounting Standard SFAS no 87
This study uses both basic and self-selection regression models to test three hypotheses about the effect of SFAS 87 disclosures on information asymmetry during 1985- 1987. Both types of models test the hypotheses after controlling for changes in the inventory holding and order processing costs of the spread, while the self-selection models also control for potential self-selection bias.
Date:
August 1994
Creator:
Lin, Wen-shan
System:
The UNT Digital Library
Actinide cation-cation complexes
The +5 oxidation state of U, Np, Pu, and Am is a linear dioxo cation (AnO{sub 2}{sup +}) with a formal charge of +1. These cations form complexes with a variety of other cations, including actinide cations. Other oxidation states of actinides do not form these cation-cation complexes with any cation other than AnO{sub 2}{sup +}; therefore, cation-cation complexes indicate something unique about AnO{sub 2}{sup +} cations compared to actinide cations in general. The first cation-cation complex, NpO{sub 2}{sup +}{center_dot}UO{sub 2}{sup 2+}, was reported by Sullivan, Hindman, and Zielen in 1961. Of the four actinides that form AnO{sub 2}{sup +} species, the cation-cation complexes of NpO{sub 2}{sup +} have been studied most extensively while the other actinides have not. The only PuO{sub 2}{sup +} cation-cation complexes that have been studied are with Fe{sup 3+} and Cr{sup 3+} and neither one has had its equilibrium constant measured. Actinides have small molar absorptivities and cation-cation complexes have small equilibrium constants; therefore, to overcome these obstacles a sensitive technique is required. Spectroscopic techniques are used most often to study cation-cation complexes. Laser-Induced Photacoustic Spectroscopy equilibrium constants for the complexes NpO{sub 2}{sup +}{center_dot}UO{sub 2}{sup 2+}, NpO{sub 2}{sup +}{center_dot}Th{sup 4+}, PuO{sub 2}{sup +}{center_dot}UO{sub 2}{sup 2+}, …
Date:
December 1994
Creator:
Stoyer, N. J. & Seaborg, G. T.
System:
The UNT Digital Library
Addition, Omission and Revision: the Stylistic Changes Made to Zehn Variationen über ein Präludium von Chopin by Ferruccio Busoni
This study examines what Busoni meant by "formal deficiencies" when he described his 1884 version of Chopin Variations, and reveals that changes made to the 1884 version during its process of revision in 1922 correct the "formal deficiencies" and show a fundamental change in Busoni's compositional style and perception of musical motion. Including a detailed analysis of the modifications, omissions, and additions made to the 1922 version (including an examination of the Chopin Prelude in C minor, op. 28, No. 20 as a theme to reveal aspects of its construction used in the variation process), which shows how these changes affect the work's compositional structure.
Date:
December 1994
Creator:
Yoon, Soomee
System:
The UNT Digital Library
The Administration of Auxiliary Services in Texas Public Universities: Analysis and Proposed Integrated Model
The problem of this study was to develop a model for the administration of auxiliary enterprises in Texas higher education as a cooperative effort of administrators and input from other sources. The purposes were to determine which administrators currently have the responsibility for the management of auxiliary services, to evaluate the correlation between the type of administrator and the concern for fiscal and student needs, to identify problems and opportunities for useful administration, and to develop a model integrating the strengths of each administrator and the implementation of new ideas to improve auxiliary enterprise management. A survey instrument consisting of three types of questions was mailed to both Vice Presidents of Fiscal Affairs and Student Affairs at all 26 four-year public institutions in Texas. Part I questions were informational, designed to determine who administers auxiliary services. Part II consisted of 20 questions on a Likert scale to obtain both opinions on the theories of the research, and specialized knowledge of the administrators. Part III was free response to solicit ideas from the administrators for the construction of the model. Paired t-tests were performed to determine knowledge strengths of the administrators. All other information was presented in frequency tables or narrative …
Date:
May 1994
Creator:
Yarbrough, Marianne (Marianne June)
System:
The UNT Digital Library
Adsorbate-enhanced Corrosion Processes at Iron and Iron Oxide Surfaces
This study was intended to provide a fuller understanding of the surface chemical processes which result in the corrosion of ferrous materials.
Date:
December 1994
Creator:
Murray, Eric
System:
The UNT Digital Library
Adult Christian Education for Baby Boomers: a Descriptive Case Study of Three American Churches
American churches seeking to assimilate baby boomers are struggling to meet the adult educational needs of this group. To determine what models of church-based adult education are used to meet the educational needs of this group, three large, growing American churches known for attracting boomers were identified as sites for research. A qualitative case study research design was used and results were compared using cross-case analysis. Initial data collection included a three-day visit at each church. Data were collected in three phases: Phase One consisted of personal interviews with staff and lay leaders; Phase Two focused on observation of adult education events which took place during the visitation period; Phase Three involved gathering materials that described adult education programs. To optimize the reliability and accuracy of the findings data were subjected to examination by peers, collection methods were applied consistently in each research phase, follow-up contacts were made with each church to verify observations and findings, and case records were created for each site. Eleven categories were selected and the data were presented by category. Within each category, data were delineated and organized into three areas: trends among the churches, noteworthy comments about individual programs, and comparison to the literature …
Date:
August 1994
Creator:
Donahue, William P. (William Paul)
System:
The UNT Digital Library
Adult Survivors of Childhood Sexual Abuse : Characteristics of the Mother-child Relationship
This qualitative study examined the characteristics of the mother-child relationship of adult survivors of childhood sexual abuse at the time of the abuse. The study consisted of data from the McMaster Family Assessment Device (FAD), the Family of Origin Scale (FOS), and a set of structured interview questions designed by the researcher. Autonomy/intimacy concepts from the FOS examined constructs of clarity of expression, responsibility, respect, openness, acceptance of loss and separation, expression of a wide range of feelings, conflict resolution, mood and tone, and empathy.
Date:
December 1994
Creator:
Motley, Rebecca Roper
System:
The UNT Digital Library
Advanced far infrared detector and double donor studies in Ge
This has application to astronomy and astrophysics. Selenium in Ge has been studied with a doping technique which limits complex formation. Only one ionization level has been found to correspond to selenium, which presumably occupies a substitutional site. This level is extremely unstable and its concentration decreases after annealing at 400C. Future work is planned to anneal the fast neutron damage before much selenium has formed in the {sup 74/76}Ge samples. It is expected that the observed selenium level can be better characterized and the missing selenium level is more likely to be discovered if other defects are removed before {sup 77}Se formation.
Date:
December 1, 1994
Creator:
Olsen, C.S.
System:
The UNT Digital Library
Age/Cohort Differences in Aspects of the Self-System
Age/cohort differences in several aspects of the self-system were investigated utilizing a sentence completion paradigm. Eighty-eight adults over age sixty and one hundred eight adults under age forty served as subjects. Subjects were asked to complete 30 self-referent sentence stems which were pre-structured to elicit information from the self-system. Responses were subjected to a content analysis utilizing a coding system which contained concepts used by subjects in their self-representations. Contents were coded for dimensions conceptually related to Physical Health, Autonomy, Self-Evaluation, Depression, Spirituality, and Altruism. Frequencies of codings were counted and subjected to statistical analysis for performing age group comparisons.
Date:
May 1994
Creator:
Hanselka, Larry L. (Larry Lynn)
System:
The UNT Digital Library
AIDS and Aging: Are the Eldery Becoming the New At-Risk Population?
This dissertation breaks new ground. It examines the perceptions of older adults towards AIDS prevention. Using the National Health Interview Survey, 1988: AIDS Knowledge and Attitudes Supplement, a modified Health Belief Model is developed. Despite the low number of older adults 55+ with AIDS, some extenuating circumstances increase their risk of AIDS contraction. Older adults have lower levels of knowledge about AIDS, weaker immune systems and receive more blood transfusions. Societal influences include educational neglect at the hands of physicians, healthcare workers and social service personnel. The first stage of the dissertation involved establishing older adults as an at-risk population through an extensive literature review. Next, the data was described utilizing frequencies, correlations and factor analysis. Frequencies clearly indicated that older adults in the data set had low levels of AIDS knowledge and did not view themselves at risk for AIDS contraction. Correlations between the variables were minimal. A modified Health Belief Model was developed and tested. Multiple regression determined that minimal variation in the two dependent variables, "Perceived Effectiveness of Effective Methods to Prevent AIDS Contraction" and "Perceived Effectiveness of Ineffective Methods to Prevent AIDS Contraction" was accounted for by the independent variables. Although F ratios allowed rejection of …
Date:
August 1994
Creator:
Allen, Annette Marie
System:
The UNT Digital Library
The {alpha}-induced thick-target {gamma}-ray yield from light elements
The {alpha}-induced thick-target {gamma}-ray yield from light elements has been measured in the energy range 5.6 MeV {le} E{sub {alpha}} {le} 10 MeV. The {gamma}-ray yield for > 2.1 MeV from thick targets of beryllium, boron nitride, sodium fluoride, magnesium, aluminum and silicon were measured using the {alpha}-particle beam from the Lawrence Berkeley Laboratories 88 in. cyclotron. The elemental yields from this experiment were used to construct the {alpha}-induced direct production {gamma}-ray spectrum from materials in the SNO detector, a large volume ultra-low background neutrino detector located in the Creighton mine near Sudbury, Canada. This background source was an order of magnitude lower than predicted by previous calculations. These measurements are in good agreement with theoretical calculations of this spectrum based on a statistical nuclear model of the reaction, with the gross high energy spectrum structure being reproduced to within a factor of two. Detailed comparison of experimental and theoretical excitation population distribution of several residual nuclei indicate the same level of agreement within experimental uncertainties.
Date:
October 1994
Creator:
Heaton, R. K.
System:
The UNT Digital Library
American Grotesque from Nineteenth Century to Modernism: the Latter's Acceptance of the Exceptional
This dissertation explores a history of the grotesque and its meaning in art and literature along with those of its related term, the arabesque, since their co-existence, specifically in literature, is later treated by a well-known nineteenth-century American writer in Tales of the Grotesque and Arabesque- Theories or views of the grotesque (used in literature), both in Europe and America, belong to twelve theorists of different eras, ranging from the sixteenth century to the present period, especially Modernism (approximately from 1910 to 1945)--Rabelais, Hegel, Scott, Wright, Hugo, Symonds, Ruskin, Santayana, Kayser, Bakhtin, (William Van) O'Connor, and Spiegel. My study examines the grotesque in American literature, as treated by both nineteenth-century writers--Irving, Poe, Hawthorne, and, significantly, by modernist writers--Anderson, West, and Steinbeck in Northern (or non-Southern) literature; Faulkner, McCullers, and (Flannery) O'Connor in Southern literature. I survey several novels and short stories of these American writers for their grotesqueries in characterization and episodes. The grotesque, as treated by these earlier American writers is often despised, feared, or mistrusted by other characters, but is the opposite in modernist fiction.
Date:
August 1994
Creator:
Kisawadkorn, Kriengsak
System:
The UNT Digital Library
American Sandwich: West Coast, East Coast, in Between
The thesis begins with an introduction, followed by six short stories. The stories that follow span three or four regions of the American landscape and three or four decades of the twentieth century. What drives each story is the isolation of both narrator and main character (when these are not the same) from the world of the story. In each story, there is either a sense of wanting to belong or an urge to escape, or both. The paradox--also the writer's paradox--is that if one belongs, one has no need to escape; if one escapes, one can never belong.
Date:
August 1994
Creator:
Clark, Emily A. (Emily Alcorn)
System:
The UNT Digital Library
The analysis and minimization of oxygen contamination in the powder processing of molybdenum disilicide
Problems with MoSi{sub 2} include low-temperature fracture toughness, high-temperature creep resistance, and ``pest`` phenomena. Oxygen introduced by powder processing may be the cause of some of these problems. This study led to the following conclusions: Supplied powders have significant oxygen present prior to processing (up to 2.5 %), in the form of silica on the surface. This oxygen contamination did not increase by exposure to air at room temperature. An improved powder processing method was developed that uses glass encapsulation. Analysis of microstructures created from powders that contained 4900 to 24,100 ppM oxygen showed that the silica was transferred to the fully dense MoSi{sub 2} as SiO{sub 2} inclusions. A method of producing MoSi{sub 2} with less oxygen was attempted.
Date:
April 24, 1994
Creator:
Shannon, K.
System:
The UNT Digital Library
Analysis of dynamic testing performed on structural clay tile infilled frames
The behavior of two structural clay tile infilled frames subjected to dynamic loading is investigated. The testing was performed by USACERL using a biaxial shake table machine on which two framed infills were spaced nine feet apart and connected by steel trusses and an eight inch concrete roof slab. The infills were composed of structural clay tile block which were laid with the cores horizontal. The specimen was loaded in both the out-of-plane and in-plane directions using a site specific time history record. The testing focused on determining frame and panel load-deflection behavior, acceleration amplification, and frequency degradation characteristics. The out-of-plane tests resulted in little degradation of frequency which means there was little loss of stiffness. There was no evidence of the infill {open_quotes}walking-out{close_quotes} of the steel frame; in fact the infill still had substantial stability after completion of the out-of-plane tests. As a result of the gradual increase in ground motion in the in-plane testing, the stiffness of the specimen gradually decreased. Strength and stiffness characteristics obtained from the dynamic testing were comparable to results and behavior seen in static tests. Degradation in the panel was much more rapid under the stronger ground motions which were produced during the …
Date:
December 18, 1994
Creator:
Fowler, J. J.
System:
The UNT Digital Library
Analysis of in-situ rock joint strength using digital borehole scanner images
The availability of high resolution digital images of borehole walls using the Borehole Scanner System has made it possible to develop new methods of in-situ rock characterization. This thesis addresses particularly new approaches to the characterization of in-situ joint strength arising from surface roughness. An image processing technique is used to extract the roughness profile from joints in the unrolled image of the borehole wall. A method for estimating in-situ Rengers envelopes using this data is presented along with results from using the method on joints in a borehole in porphyritic granite. Next, an analysis of the joint dilation angle anisotropy is described and applied to the porphyritic granite joints. The results indicate that the dilation angle of the joints studied are anisotropic at small scales and tend to reflect joint waviness as scale increases. A procedure to unroll the opposing roughness profiles to obtain a two dimensional sample is presented. The measurement of apertures during this process is shown to produce an error which increases with the dip of the joint. The two dimensional sample of opposing profiles is used in a new kinematic analysis of the joint shear stress-shear deformation behavior. Examples of applying these methods on the …
Date:
September 1, 1994
Creator:
Thapa, B. B.
System:
The UNT Digital Library
An Analysis of Preferred Equity Redemption Cumulative Stock
This dissertation examines whether Percs, Preferred Equity Redemption Cumulative Stocks, are properly priced regarding to the relevant securities, such as the underlying common stock, the long-term call option of the stock, and so on. Test results indicate that Percs were overpriced with respect to the equivalent packages composed of the relevant securities. Further tests on arbitrage restrictions show that transaction costs would prevent arbitrage profits. This dissertation also examines the market reactions to Percs offerings. Test results reveal that the market reactions to the announcement of Percs offering and the actual issuance are both significantly negative. Compared to the market reaction on common stock offering announcement, the market reaction on Percs offering announcement is weaker. The overpricing of Percs and the weaker reaction of the market suggest that Percs may have advantages in transaction costs, taxes and some corporate finance issues.
Date:
May 1994
Creator:
Pu, Hansong
System:
The UNT Digital Library
An Analysis of Texas Special Education Due Process Hearings from September 1, 1983, to September 1, 1992: Implications for the Administration of Special Education Programs
The purpose of this study was to assess the effects of selected characteristics on the outcomes of those special education due process hearings brought forth in the state of Texas from September 1, 1983, to September 1, 1992. A further purpose was to determine if district characteristics of size or location affect the likelihood of a district's becoming involved in a special education due process hearing. Data for the study was collected for all special education due process hearings conducted in the State of Texas from September 1, 1983, to September 1, 1992. A coding system was used to record the data for the study and the Chi-square test of independence was used to determine whether a relationship existed between the selected variable (hearing issue, disability classifications and restrictiveness of placement) and hearing outcome. The frequency of involvement in hearings for districts of various size and urban characteristics was displayed as a percentage.
Date:
August 1994
Creator:
Webb, Paula J. (Paula Jean)
System:
The UNT Digital Library
An Analysis of the Management and Leadership Development Training Needs of Texas Principals on the Texas State Board of Education's Core Curriculum
The problem of this study was to determine training priorities as mandated by the Texas Legislature on the CORE Curriculum for Management and Leadership Development and their implications for Texas public school principals. Purposes of the study were to validate an instrument for assessing principals' training needs, to provide data for planning and delivering training for principals, to provide results to staff developers, and to develop a profile of similarities and differences in the perceptions of principals and their superordinates.
Date:
December 1994
Creator:
Morris, Amelia Marie
System:
The UNT Digital Library
An Analysis of Two Dimensional Printed Elements Within Three Dimensional Structures
I believe the frame or housing of a printed image plays an integral role in the context of the work. It functions as a vehicle for possible interpretation. It should respond to and complement the concept of the central image. The image presented in a vessel or reliquary format should instill a meditative or religious response.
Date:
May 1994
Creator:
Hubner, Lynne J.
System:
The UNT Digital Library
Androgyny and Managerial Effectiveness in a Total Quality Management Organization
The majority of studies concerning psychological sex and management style have indicated that people consider the masculine style of managing to be the most popular. However, such studies are out of date and/or were usually measuring the perceptions of surveyed college students. Few studies have focused on successful managers in successful organizations. A modified version of the Bern Sex Role Inventory was distributed to 52 managers in a Total Quality Management organization. This study hypothesized that successful managers would be androgynous managers. The results of the study indicated that successful managers are androgynous managers, and that there is no significant difference in the number of female and male androgynous managers.
Date:
August 1994
Creator:
Byers, Lori A. (Lori Ann)
System:
The UNT Digital Library