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1,422
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1,142
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640
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635
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628
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20,531 Matching Results
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Scaling Behaviors and Mechanical Properties of Polymer Gels
Polymer gels undergo a volume phase transition in solvent in response to an infinitesimal environmental change. This remarkable phenomenon has resulted in many potential applications of polymer gels. The understanding of its mechanical properties has both scientific and technological importance. For this purpose, we have developed a novel method for measuring Poisson's ratio, which is one of the most important parameters determining the mechanical property of gels. Using this method, Poisson's ratio in N-isopropyacrylamide (NIPA) and polyacrylamide (PAAM) gels has been studied.
Date:
May 1994
Creator:
Li, Chʻun-fang
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Nesting Ecology and Reproductive Correlates in the Desert-nesting Gray Gull Larus Modestus
General objectives of my study were to describe the reproductive ecology of gray gulls in the large Lealtad colony, with emphasis on demographic parameters and physiological adaptations of eggs and chicks, which would complete some original objectives established in the early 1980's by Guerra and Fitzpatrick. Specifically, my study focused on describing, then comparing with other desert and non-desert nesting larids, interactive effects of ambient physical conditions and nest-site predation on eggs and chicks.
Date:
May 1993
Creator:
Aguilar Pulido, Roberto E. (Roberto Eric)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Analysis of Thermoplastic Polyimide + Polymer Liquid Crystal Blends
Thermoplastic polyimides (TPIs) exhibit high glass transition temperatures (Tgs), which make them useful in high performance applications. Amorphous and semicrystalline TPIs show sub-Tg relaxations, which can aid in improving strength characteristics through energy absorption. The a relaxation of both types of TPIs indicates a cooperative nature. The semicrystalline TPI shows thermo-irreversible cold crystallization phenomenon. The polymer liquid crystal (PLC) used in the blends is thermotropic and with longitudinal molecular structure. The small heat capacity change (ACP) associated with the glass transition indicates the PLC to be rigid rod in nature. The PLC shows a small endotherm associated with the melting. The addition of PLC to the semicrystalline TPI does not significantly affect the Tg or the melting point (Tm). The cold crystallization temperature (Tc) increases with the addition of the PLC, indicating channeling phenomenon. The addition of PLC also causes a negative deviation of the ACP, which is another evidence for channeling. The TPI, PLC and their blends show high thermal stability. The semicrystalline TPI absorbs moisture; this effect decreases with the addition of the PLC. The absorbed moisture does not show any effect on the degradation. The addition of PLC beyond 30 wt.% does not result in an improvement …
Date:
May 1998
Creator:
Gopalanarayanan, Bhaskar
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
AIDS Preventative Behavior Among Taiwanese University Students
This study used the Health Belief Model to examine the predictors of AIDS preventive behavior. The independent variables were the variables of individual perception, modifying factors (psychological variables), and likelihood variables. The respondents, the Taiwanese students of the University of North Texas, were influenced both by Chinese sexuality and Western values in their AIDS-risk behavior. The results revealed that 90% of the respondents were misinformed on the availability of AIDS vaccine. In addition, a majority of the students were either abstaining from sex or practicing monogamy. Using Pearson's correlation coefficient and multiple regression analysis, this study found that the psychological variables rather than cognitive variables significantly influenced the respondents' AIDS preventive behavior. Finally, suggestions were made for future research on AIDS, and for AIDS preventive behavior campaigns.
Date:
May 1997
Creator:
Wang, Ya-Chien
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Experimental and Theoretical Studies of Polycarbocyclic Compounds
Part I. Diels-Alder cycloadditions of 1,2,3,4,9,9-hexachloro-1α,4α,4aα,8aβ-tetrahydro-l,4-methanonaphthalene (32) and 1,2,3,4,9,9-hexachloro-lα,4α,6,7- tetrahydro-l,4-methanonaphthalene (33) to 4-methyl- and 4-phenyl-l,2,4-triazoline-3,5-dione [MTAD and PTAD, respectively] and to N-methylmaleimide (NMM) have been studied. The structures of several of the resulting cycloadducts were determined by X-ray crystallographic methods. The observed stereoselectivity of each of these Diels-Alder reactions was further investigated via application of theoretical methods. Thus, semiempirical (AMI) and ab initio molecular orbital calculations were used to calculate relative energies. Ab initio calculations were employed to perform frontier molecular orbital analyses of diene-dienophile interactions.
Date:
May 1998
Creator:
Shukla, Rajesh, 1964-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Relationship between Parental Empathy and Parental Acceptance and the Effect of Filial Therapy Training on this Relationship
This study was conducted to determine the relationship between parental empathy (PE) and parental acceptance (PA) and the effect of filial therapy training (FTT) on this relationship. Filial therapy training is a parent education program in which the goal is the development of PE and PA. The Measurement of Empathy in Adult-Child Interaction (MEACI) and the Porter Parental Acceptance Scale (PPAS) are two widely used instruments in filial therapy studies to measure PE and PA, respectively. The purpose of this study was to determine the relationship between parental empathy and parental acceptance, and the effect of filial therapy training on this relationship. Specifically, this study was designed to investigate the correlations between the MEACI and the PPAS.
Date:
May 1998
Creator:
Poon, Wai-Chi Samuel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effect of Supplementary Materials upon Academic Achievement in and Attitude toward Mathematics among Eighth Grade Students
The problem of the study was to examine the effectiveness of using supplementary materials in the teaching of eighth grade mathematics. The study considered the effect that supplementary materials had on students in terms of the following variables--attitude toward mathematics, mathematical concepts, problem solving ability, understanding common fractions, computation of common fractions, decimal fractions and per cent, concepts of numbers and numerals (number system and operations), and concepts of numbers and numerals (decimal place value).
Date:
May 1971
Creator:
Wilkinson, Gerald Glendel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Effects of Instructional Methods on Student Performance in Postsecondary Developmental Mathematics
This study examined success rates and end-of-semester grades for three instructional methods used in developmental algebra and college algebra. The methods investigated were traditional lecture, laboratory, and computer mediated learning. The population included the 10,095 students who had enrolled in developmental algebra and college algebra at Richland College in Dallas, Texas, for five semesters. Success was defined as earning a grade of A, B, C, or D in a course.
Date:
May 1999
Creator:
Hernandez, Celeste Peyton
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Two Semester Life Science Syllabus for Use in Texas Public Schools with Seventh Grade Students
The problem of using a state adopted textbook written to apply to a large body of students with varying interests and needs was overcome by using a detailed syllabus that arranged course content in a meaningful sequence that appealed to student interest. The outlined syllabus prepared a two semester life science curriculum to be used by the teacher to guide lesson planning. Both semesters were divided into three units each. Materials included in the syllabus were given to actual student groups in real classroom settings. Since hands on learning was an important part of classroom instruction, two laboratory sections were included in the appendices to be used with the syllabus.
Date:
May 1995
Creator:
Edwards, Gail G. (Gail Graham)
Object Type:
Thesis or Dissertation
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)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Examination of Strain Among Community Police Officers in Northumbria, England
This paper examines some causes of strain and frustration among police officers. Previous research suggests that police officers sufferfromthe lack of communication and support from their community. The failure of communication has caused turmoil in the past between communities and their police. A possible solution is community policing. Community policing is supposed to establish communication between the public and the police. Causes of strain and frustration among the police are discussed along with the possible benefits of community policing. Research has shown that community police officers suffer less strain and frustration than their brethren. On this premise a quantitative examination a police force in Northumbria, England was conducted. The quantitative analysis focuses on two groups; community police officers and police officers not involved in community policing.
Date:
May 1994
Creator:
Humburg, Joel D. (Joel David)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Development and Application of an Assessment Protocol for Watershed Based Biomonitoring
With numerous bioassessment methodologies available, a regional protocol needs to be developed to ensure that results are comparable. A regional assessment protocol was developed that includes collecting five benthic macroinvertebrate samples, identifying organisms to genus, and calculating the following metrics: Number of Taxa, Total Number of Individuals, Simpson's Diversity Index, Shannon's Diversity Index, Percent Contribution of Dominant Taxa, Hilsenhoffs Biotic Index, and Percent Contribution of Dipterans. Once the protocol was developed, it was used to assess the Bayou Chico tributaries and watershed. All three tributaries had been significantly impacted by human activity as had the watershed as a whole. This study indicates that a regional protocol could be developed and is appropriate for biomonitoring at the watershed scale.
Date:
May 1998
Creator:
Schwartz, Joseph Howard
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Assessment and Analysis of Per Pupil Expenditures: a Study Testing a Micro-Financial Model in Equity and Student Outcome Determination
The purpose of this study was to examine district level financial data to assess equity across districts, to compare equity benchmarks established in the literature using selected functions from the state's financial database, and to determine the predictive value of those functions to the Texas Assessment of Academic Skills (TAAS) tests of 1997.
Date:
May 1999
Creator:
Holsomback, James Richard
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Anglo-American Council on Productivity: 1948-1952 British Productivity and the Marshall Plan
The United Kingdom's postwar economic recovery and the usefulness of Marshall Plan aid depended heavily on a rapid increase in exports by the country's manufacturing industries. American aid administrators, however, shocked to discover the British industry's inability to respond to the country's urgent need, insisted on aggressive action to improve productivity. In partial response, a joint venture, called the Anglo-American Council on Productivity (AACP), arranged for sixty-six teams involving nearly one thousand people to visit U.S. factories and bring back productivity improvement ideas. Analyses of team recommendations, and a brief review of the country's industrial history, offer compelling insights into the problems of relative industrial decline. This dissertation attempts to assess the reasons for British industry's inability to respond to the country's economic emergency or to maintain its competitive position faced with the challenge of newer industrializing countries.
Date:
May 1999
Creator:
Gottwald, Carl H.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Risks and Effects of Outsourcing on the Information Systems Function and the Firm
IS outsourcing, especially large-scale IS outsourcing, is a comparatively recent and rapidly growing IS phenomenon, but it is also an inherently risky activity. In an IS outsourcing arrangement, the outsourcing vendor accepts responsibility for IS resources and functions formerly controlled directly by the firm. This research examines IS outsourcing from two perspectives. (1) From an IS perspective, it examines the risk perceptions of IS managers of fourteen Fortune-500 firms who had recently conducted an outsourcing evaluation. (2) From a financial perspective, it examines the theoretical relationship of IS outsourcing with financial performance, and investigates the empirical effects of IS outsourcing on the firm's market value and market risk. This research views IS outsourcing as an independent variable whose effects on the firm may be measured as changes in security returns, changes in asset risk, changes in capital structure, and long-term changes in profitability. To accomplish this, it characterizes IS outsourcing as a sale-and-leaseback transaction.
Date:
May 1994
Creator:
Peak, Daniel Alan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Impacts of the Pyrethroid Insecticide Cyfluthrin on Aquatic Invertibrate Populations in Outdoor Experimental Tanks
The chemical fate and biological impacts of cyfluthrin in aquatic ecosystems were investigated using microcosms (1.9 m^3 concrete tanks) during 1989. Results were compared to a concurrent pesticide registration study using mesocosms (634.7 m^3 earthen ponds). Ten spray drift and five soil runoff simulations were conducted. Pesticide loadings were scaled by system volume, with the same experimental design in ponds and microcosms. Aqueous cyfluthrin concentrations and sediment residue values were generally higher in microcosms, while aqueous half-life was shorter in the smaller systems.
Date:
May 1992
Creator:
Johnson, Philip C. (Philip Charles)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Quantum-Confined CdS Nanoparticles on DNA Templates
As electronic devices became smaller, interest in quantum-confined semiconductor nanostructures increased. Self-assembled mesoscale semiconductor structures of II-VI nanocrystals are an especially exciting subject because of their controllable band gap and unique photophysical properties. Several preparative methods to synthesize and control the sizes of the individual nanocrystallites and the electronic and optical properties have been intensively studied. Fabrication of patterned nanostructures composed of quantum-confined nanoparticles is the next step toward practical applications. We have developed an innovative method to fabricate diverse nanostructures which relies on the size and a shape of a chosen deoxyribonucleic acid (DNA) template.
Date:
May 1998
Creator:
Rho, Young Gyu
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Citation Accuracy in the Journal Literature of Four Disciplines : Chemistry, Psychology, Library Science, and English and American Literature
The primary purpose of this study was to determine if there is a relationship between the bibliographic citation practices of the members of a discipline and the emphasis placed on citation accuracy and purposes in the graduate instruction of the discipline.
Date:
May 1992
Creator:
Sassen, Catherine J. (Catherine Jean)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Beyond the Merchants of Death: the Senate Munitions Inquiry of the 1930s and its Role in Twentieth-Century American History
The Senate Munitions Committee of 1934-1936, chaired by Gerald Nye of North Dakota, provided the first critical examination of America's modern military establishment. The committee approached its task guided by the optimism of the progressive Social Gospel and the idealism of earlier times, but in the middle of the munitions inquiry the nation turned to new values represented in Reinhold Niebuhr's realism and Franklin D. Roosevelt's Second New Deal. By 1936, the committee found its views out of place in a nation pursuing a new course and in a world threatening to break out in war. Realist historians writing in the cold war period (1945-1990) closely linked the munitions inquiry to isolationism and created a one-dimensional history in which the committee chased evil "merchants of death." The only book-length study of the munitions investigation, John Wiltz's In Search of Peace, published in 1963, provided a realist interpretation. The munitions inquiry went beyond the merchants of death in its analysis of the post-World War I American military establishment. A better understanding emerges when the investigation is considered not only within an isolationist framework, but also as part of the intellectual, cultural, and political history of the interwar years. In particular, Franklin …
Date:
May 1996
Creator:
Coulter, Matthew Ware
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effects of Stock Delistings on Firm Value, Risk, Market Liquidity and Market Integration: With Evidence on Wealth Effects from the Stock Exchanges of Malaysia and Singapore, Using GARCH
This study examines the effects of delisting on firm value, risk and market liquidity. In a world where markets are becoming increasingly integrated, delistings may prove counter productive. We use the unique event, free from company specifics, that occurred on January 2, 1990 in the stock exchanges of Singapore and Malaysia to test for the above effects. On that day, dual listed companies were required to delist from the foreign stock exchange. We also use this event to test if the Singapore and Malaysia markets are globally integrated. Since financial data is found to show persistence in volatility, we model the return generating process in a generalized autoregressive conditionally heteroskedastic (GARCH) framework that takes into consideration changing volatility. For comparison purposes, OLS and Time-Deformation models are included. The study found delistings to decrease firm value, the size of which is related to how actively the stocks were previously traded on the foreign stock exchange. Risk levels increased following delistings. Nevertheless, thinly traded stocks showed significant changes in neither firm value nor riskiness. Further evidence of new listings to increase firm value was noted. Consistent with the political motive hypothesis, delisted stocks showed an increase in post-event volume, but however, lost …
Date:
May 1996
Creator:
Meera, Ahamed Kameel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Collapsing Result Using the Axiom of Determinancy and the Theory of Possible Cofinalities
Assuming the axiom of determinacy, we give a new proof of the strong partition relation on ω1. Further, we present a streamlined proof that J<λ+(a) (the ideal of sets which force cof Π α < λ) is generated from J<λ+(a) by adding a singleton. Combining these results with a polarized partition relation on ω1
Date:
May 2001
Creator:
May, Russell J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Comparison of the Personality Traits of Effective Teachers of Bilingual and English as a Second Language Students with the Personality Traits of Effective Teachers of Traditional Elementary School Students
The purpose of this study was to identify the personality traits of effective elementary bilingual/ESL teachers, to identify the personality traits of effective traditional elementary teachers, and to compare the two groups.
Date:
May 1993
Creator:
Allgaier, Sylvia Mahon
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Harpsichord Concertos of Wilhelm Friedemann Bach, a Lecture Recital, Together with Three Recitals of Selected Works of J.S. Bach, W.F. Bach, D. Scarlatti, F. Couperin, J.J. Froberger, G. Ligeti, W. Byrd, and Others
The harpsichord concertos of Wilhelm Friedemann Bach (1710-1784) have suffered undeserved neglect. The four authenticated solo concertos remain in manuscript, with the result that his contribution to the history of the keyboard concerto has been largely overlooked. This study begins to correct this situation by examining these four concertos--F41 in D Major, F43 in E Minor, F44 in F Major, and F45 in A Minor--as well as the published two-harpsichord Concerto in E-Flat Major, F46, and the incomplete Concerto in E-Flat Major, F42 in order to assess W. F. Bach's contribution to the keyboard concerto following its origins in the early 1700s. The results of this investigation show that W. F. Bach took the early keyboard concerto of his father's generation and added many of the characteristics which became associated with the mid-eighteenth century concerto. Friedemann retained the polyphonic interplay between tutti and solo, harmonic language, and tonal plan of his father's compositions and added a wealth of rhythmic ideas and a more modern melodic style. He worked within an established four ritornello/three solo plan for the outer movements, but employed a variety of formal plans for the middle movements. Friedemann heightened the contrast between the solo and the orchestra …
Date:
May 1995
Creator:
Hunt, Janet Evelyn
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Interactions of Clean and Sulfur-modified Reactive Metal Surfaces with Aqueous Vapor and Liquid Environments : A Combined Ultra-high Vacuum/electrochemistry Study
The focus of this research is to explore the molecular-level interactions between reactive metal surfaces and aqueous environments by combined ultra-high vacuum/electrochemistry (UHV-EC) methodology. The objectives of this work are to understand (1) the effects of sulfate ions on the passivity of metal oxide/hydroxide surface layer, (2) the effects of sulfur-modification on the evolution of metal oxide/hydroxide surface layer, and (3) the effects of sulfur adsorbate on cation adsorption at metal surfaces.
Date:
May 1998
Creator:
Lin, Tien-Chih, 1966-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library