UNT Theses and Dissertations - Browse


Energy Losses of Protons Projected through a Plasma Due to Collisions with Electrons of the Plasma for a Variety of Non-Maxwellian Electron Velocity Distributions

Description: The purpose of this thesis is to study energy losses suffered by protons in traversing a plasma through collision with the electrons of the plasma. For these electrons a variety of non-Maxwellian velocity distributions are assumed.
Date: August 1961
Creator: Kregel, Mark Douglas
Partner: UNT Libraries

Energy Paths and Political Commitments: Their Roles in Environmental Inequality

Description: Decentralized renewable energy procurement has gained traction in recent years for its potential to alleviate rural energy poverty and environmental degradation in developing countries. Hence, this study investigates if deploying renewable energy can mitigate rural energy poverty in developing countries as often claimed. Because any energy regime cannot be initiated or sustained without the conviction of local political leaders, the study also evaluates the extent to which government investments in the development of renewable energy technologies and the energy sector, affect the environmental quality (i.e. greenhouse gas emissions) of developing countries. Energetic theory and environmental inequality constitute the key conceptual premises guiding this study. Ordinary least squares regression is utilized to analyze the relationship between key variables. The results reveal that as of 2010, use of renewable energy can indeed support rural electrification. Higher GNI per capita and use of conventional fuels are also positively related to rural electrification, all else equal. As for environmental degradation in 2005 and 2008, R&D investments actually tend to increase GHG emissions; procuring energy from either renewable or non-renewable sources is however, found to be environmentally detrimental, net of all other variables. Finally, some evidence is found for the role of aid funds and multilateral debt in abating GHG emissions.
Date: May 2014
Creator: Ong, Corinne
Partner: UNT Libraries

Energy Policy in the Republic of China and Japan, 1970-1985: A Comparative Examination of Energy Politics and Policies

Description: The impact of the energy crises in the 1970s hit all oil-importing countries much harder than it hit countries endowed with domestic supplies of energy. Energy politics and policies for the oil-importing countries have become vital issues that need to be examined. The purpose of this dissertation is to examine and compare the energy politics and policy processes in the Republic of China (ROC) and Japan during the period of 1970-1985. The study focuses on the politics of energy policies, using a policy analysis or systems framework for examining the policy processes in the two countries. A comparison is made of energy environments, the political actors, the institutions, and finally the substance of energy policy. An assessment is then made of the effects or consequences of energy policies on these two countries. In attempting to study energy politics and policies in these two Asian countries, the researcher began with a policy model or conceptual schema of energy politics from which the researcher raised a number of research questions. These questions were used to guide the direction of the study. A comparison was first made of energy systems, and then the major actors in the energy resources field were identified by comparing the political systems. Comparison of the political systems in energy politics helped to explain the differences in the political outcomes of energy policy. An assessment was made by using a series of multiple regression models to assess and compare the consequences of energy policies in these two countries. The final purpose of this dissertation is to develop a conceptual model or framework, for understanding the complexity, uncertainty, and interrelatedness of energy policies. The researcher concludes that comparative policy studies are useful and provide insights which otherwise would be missed.
Date: August 1987
Creator: Wang, Han-Kuo
Partner: UNT Libraries

Energy Usage While Maintaining Thermal Comfort : A Case Study of a UNT Dormitory

Description: Campus dormitories for the University of North Texas house over 5500 students per year; each one of them requires certain comfortable living conditions while they live there. There is an inherit amount of money required in order to achieve minimal comfort levels; the cost is mostly natural gas for water and room heating and electricity for cooling, lighting and peripherals. The US Department of Energy has developed several programs to aid in performing energy simulations to help those interested design more cost effective building designs. Energy-10 is such a program that allows users to conduct whole house evaluations by reviewing and altering a few parameters such as building materials, solar heating, energy efficient windows etc. The idea of this project was to recreate a campus dormitory and try to emulate existent energy consumption then try to find ways of lowering that usage while maintaining a high level of personal comfort.
Date: December 2011
Creator: Gambrell, Dusten
Partner: UNT Libraries

Engaging Lives: a Nomadic Inquiry Into the Spatial Assemblages and Ethico-aesthetic Practices of Three Makers

Description: This research is a nomadic inquiry into the ethics and aesthetics of three makers’ social and material practices. Deleuze’s concept of the nomad operated in multiple ways throughout the process, which was embedded in performative engagements that produced narratives of becoming. Over four months, I built relationships with three people as I learned about the ethico-aesthetic significance of their daily practices. The process started by interviewing participants in their homes and expanded over time to formal and informal engagements in school, community, and agricultural settings. I used Guattari’s ecosophical approach to consider how subjectivity was produced through spatial assemblages by spending time with participants, discussing material structures and objects, listening to personal histories, and collaboratively developing ideas. Participants included a builder who repurposed a missile base into a private residence and community gathering space, an elementary art teacher who practiced urban homesteading, and a young artist who developed an educational farm. The research considers the affective force of normalized social values, the production of desire by designer capitalism, and the mutation of life from neoliberal policies. Our experiences illuminate the community-building potential of direct encounters and direct exchanges. The project generates ideas for becoming an inquirer in the everyday and reveals possibilities for producing pedagogical experiences through collective and dissensual action. Ultimately, the project produces hope for performative and anti-disciplinary approaches to education, rupturing false divisions that fragment the force of thought, to produce, instead, aesthetic experiences that privilege processes and are based in direct and collective engagements with life.
Date: May 2014
Creator: Coats, Cala R.
Partner: UNT Libraries

Engineered Microbial Consortium for the Efficient Conversion of Biomass to Biofuels

Description: Current energy and environmental challenges are driving the use of cellulosic materials for biofuel production. A major obstacle in this pursuit is poor ethanol tolerance among cellulolytic Clostridium species. The first objective of this work was to establish a potential upper boundary of ethanol tolerance for the cellulosome itself. The hydrolytic function of crude cellulosome extracts from C. cellulolyticum on carboxymethyl cellulose (CMC) with 0, 5, 10, 15, 20 and 25% (v/v) ethanol was determined. Results indicated that the endoglucanase activity of the cellulosome incubated in 5% and 10% ethanol was significantly different from a control without ethanol addition. Furthermore a significant difference was observed in endoglucanase activity for cellulosome incubated in 5%, 10%, 15%, 20% and 25% ethanol in a standalone experiment. Endoglucanase activity continued to be observed for up to 25% ethanol, indicating that cellulosome function in ethanol will not be an impediment to future efforts towards engineering increasing production titers to levels at least as high as the current physiological limits of the most tolerant ethanologenic microbes. The second objective of this work was to study bioethanol production by a microbial co-culture involving Clostridium cellulolyticum and a recombinant Zymomonas mobilis engineered for the utilization of oligodextrans. The recombinant Z. mobilis ZM4 pAA1 and wild type ZM4 were first tested on RM medium (ATCC 1341) containing 2% cellobiose as the carbon source. Ethanol production from the recombinant Z. mobilis was three times that observed from the wild type Z. mobilis. Concomitant with ethanol production was the reduction in OD from 2.00 to 1.580, indicating the consumption of cellobiose. No such change in OD was observed from the wild type. The recombinant ZM4 was then co-cultured with C. cellulolyticum using cellobiose and microcrystalline cellulose respectively as carbon sources. Results indicate that the recombinant ZM4 acted synergistically with C. cellulolyticum ...
Date: August 2014
Creator: Anieto, Ugochukwu Obiakornobi
Partner: UNT Libraries

England and the International Monetary System of the Nineteenth Century

Description: There were two international standards in the nineteenth century, the theoretical gold standard and the historical sterling standard. The primary interest of this thesis is the latter, although the theoretical framework of the gold standard will also be examined. Because of its role in the London money market, particular attention will be given to the Bank of England. Since the Bank and the international standards were products of the evolutionary and revolutionary changes which occurred in Britain during the eighteenth and nineteenth centuries, an attempt will be made to examine them within their historical context.
Date: May 1963
Creator: Murray, Jack W.
Partner: UNT Libraries

English Adverbials of Degree and Extent

Description: This thesis presents detailed descriptions of the English adverbial of degree (e.g., very, quite,rather,extremely) and the adverbial of extent (e.g., much, some, at all, excessively).
Date: August 1971
Creator: Campbell, Iva Helen Harter
Partner: UNT Libraries

English Devotional Song of the Seventeenth Century in Printed Collections from 1638 to 1693: A Study of Music and Culture

Description: Seventeenth-century England witnessed profound historical, theological, and musical changes. A king was overthrown and executed; religion was practiced fervently and disputed hotly; and English musicians fell under the influence of the Italian stile nuovo. Many devotional songs were printed, among them those which reveal influences of this style. These English-texted sacred songs for one to three solo voices with continuo--not based upon a previously- composed hymn or psalm tune—are emphasized in this dissertation. Chapter One treats definitions, past neglect of the genre by scholars, and the problem of ambiguous terminology. Chapter Two is an examination of how religion and politics affected musical life, the hiatus from liturgical music from 1644 to 1660 causing composers to contribute to the flourishing of devotional music for home worship and recreation. Different modes of seventeenth-century devotional life are discussed in Chapter Three. Chapter Four provides documentation for use of devotional music, diaries and memoirs of the period revealing the use of several publications considered in this study. Baroque musical aesthetics applied to devotional song and its raising of the affections towards God are discussed in Chapter Five. Chapter Six traces the influence of Italian monody and sacred concerto on English devotional song. The earliest compositions by an Englishman working in the stile nuovo are Henry Lawes' 1638 hymn tunes with continuo. Collections of two- and three-voice compositions by Child, the Lawes brothers, Wilson, and Porter, published from 1639 to 1657, comprise Chapter Seven, as well as early devotional works of Locke. Chapter Eight treats Restoration devotional song-- compositions for one to three voices and continuo, mostly of a more secular and dramatic style than works discussed in earlier. The outstanding English Baroque composers--Locke, Humfrey, Blow, and Purcell--are represented, and the apex of this style is found in the latest seventeenth-century publication of devotional song, ...
Date: May 1986
Creator: Treacy, Susan
Partner: UNT Libraries

An English-French Glossary of Library Terms

Description: The problem in this study has been to analyze the vocabulary needs in the field of Library Service and to develop a professional tool, including an English-French glossary of approximately fifteen hundred terms concerning the making, the acquisition, and the organization of books as related to Library Service.
Date: August 1939
Creator: Collier, Thelma Johns
Partner: UNT Libraries

English language learners: Does summer school make a difference in young children's literacy scores?

Description: Many school districts consider literacy and oral language as a top priority for pre-kindergarten students. In the district under study, pre-kindergarten English language learner (ELL) students are encouraged to attend a special summer school program to increase their oral language ability in English. This study compared three groups of children: ELL students attending summer school v. ELL students not attending summer school v. English speaking students not attending summer school. The students' primary reading inventory scores from the end of pre-kindergarten to the middle of kindergarten in the areas of reading, writing and oral language were compared. As expected, ELLs who attended summer school showed significant growth in oral language development from the beginning of summer school to the end of summer school. While it was hypothesized that ELL students attending summer school would show more improvement in oral language than other children over time, there was no significant difference between summer school and non-summer school children's scores by the middle of kindergarten.
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Date: August 2006
Creator: Wickert, DeAnna S.
Partner: UNT Libraries

English Methods Courses in Texas Preparation for the Essential Elements

Description: This study analyzes the congruence between the objectives of secondary-level English methods courses in Texas universities and the objectives of the state-mandated high school curriculum (the essential elements) in language arts. A questionnaire was used to obtain information from 26 English methods instructors at 22 universities in Texas. The data obtained from these questionnaires reveal that these instructors strongly emphasize preparing prospective English teachers to teach the essential elements of composition. Other significant findings include: (1) the lack of emphasis in the English methods course on strategies for teaching the essential elements of language, when those elements are unrelated to composition, and (2) the lack of uniformity which characterizes the organization of the English methods course at major Texas universities.
Date: August 1988
Creator: Erwin, Martha L. (Martha Lea)
Partner: UNT Libraries

English Pastoral Drama, 1580-1642

Description: It will be the purpose of the remaining chapters of this thesis to trace the characteristics and conventions of the pastoral as they can be observed in specific bucolic works from various writers of various nationalities and ultimately examine specific examples of English pastoral drama in light of these conventions and characteristics.
Date: 1958
Creator: Fulwiler, Lavon Buster
Partner: UNT Libraries

English Renaissance Epithalamia

Description: The classical genre of marriage poems called epithalamia appeared in England in the late sixteenth century. The English epithalamia of the Renaissance form a closely related body of literature. This work will be a close analysis of this small body of English Renaissance poetry.
Date: August 1970
Creator: Corse, Larry B.
Partner: UNT Libraries

English Utopias

Description: This thesis discusses Utopian thought and compares the Utopias of Plato, Sir Thomas More, Sir Francis Bacon, and Jonathan Swift in the areas of government, education, and social problems.
Date: 1940
Creator: Smith, Stella Parker
Partner: UNT Libraries

Enhanced Coarse-Graining for Multiscale Modeling of Elastomers

Description: One of the major goal of the researchers is to reduce energy loss including nanoscale to the structural level. For instance, around 65% of fuel energy is lost during the propulsion of the automobiles, where 11% of the loss happens at tires due to rolling friction. Out of that tire loss, 90 to 95% loss happens due to hysteresis of tire materials. This dissertation focuses on multiscale modeling techniques in order to facilitate the discovery new rubber materials. Enhanced coarse-grained models of elastomers (thermoplastic polyurethane elastomer and natural rubber) are constructed from full-atomic models with reasonable repeat units/beads associated with pressure-correction for non-bonded interactions of the beads using inverse Boltzmann method (IBM). Equivalent continuum modeling is performed with volumetric/isochoric loading to predict macroscopic mechanical properties using molecular mechanics (MM) and molecular dynamics (MD). Glass-transition and rate-dependent mechanical properties along with hysteresis loss under uniaxial deformation is predicted with varying composition of the material. A statistical non-Gaussian treatment of a rubber chain is performed and linked with molecular dynamics in order predict hyperelastic material constants without fitting with any experimental data.
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Date: December 2016
Creator: Uddin, Md Salah
Partner: UNT Libraries

Enhanced learning performance in the middle school classroom through increased student motivation, by the use of educational software and question-based gaming technology.

Description: The purpose of this research was to determine if the introduction of a competitive and collaborative computer-based gaming software system into middle school classrooms would result in improved attendance and grades, and motivate students to have a greater interest in their studies. This study was conducted over a 6 week period, with attendance and performance data being collected from 284 students. Two quantitative surveys were used to measure course interest and motivation: (a) the Course Interest Survey (CIS), and (b) the Instructional Materials Motivation Survey (IMMS). Participation in these surveys consisted of 84 students taking the CIS and 40 students taking the IMMS. The results indicated that the experimental group showed statistically better scores than the comparison group in attendance and performance. Students participating in the experimental group had significantly lower mean ranks of absenteeism compared to students in the comparison group. Results also revealed significant differences on grades. Students that were in the experimental group had significantly higher grades compared to students that were in the comparison group. Results of the CIS suggest that a statistically significant difference does not exist on Attention, Relevance, Confidence, and Satisfaction between the experimental and comparison groups. Results of the means and standard deviations for the IMMS Motivation Scores fell somewhere between Moderately true and Mostly true. This research study suggests that student's attendance and performance can be improved when quiz based gaming software that is both collaborative and competitive is used regularly in the classroom. However, for student's that participated in the gaming software, their interest in studying the subject doesn't appear to be significantly different from students that did not participate.
Date: December 2006
Creator: Dorr, David L.
Partner: UNT Libraries

Enhancement by Human Chorionic Gonadotropin of Transformation of Chick Embryo Fibroblasts and Rat Kidney Cells Infected with Temperature-Sensitive and Wild Type Rous Sarcoma Viruses

Description: Human chorionic gonodotropin (HCG) affected in various ways cell cultures infected with strains of Rous sarcoma virus (RSV). The cell cultures studied were chick embryo fibroblasts (CEF), normal rat kidney cells infected with temperature-sensitive mutant (LA31-NRK) and a wild type RSV (B77-NRK). HCG increased the rate of transformation and viral titer of CEF cells infected with RSV, but not B77-NRK. HCG increased significantly transformation rates of LA31-NRK, only if the temperature sensitive transformation process was first delayed by incubation at non-permissive temperatures. It is suggested that some postinfective, pretransformational event(s) may operate before viralmediated transformation rates are increased by HCG.
Date: August 1981
Creator: Mitchell, Monte Mark
Partner: UNT Libraries

Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide

Description: A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to the oxide bond with carbon i.e. defect in graphene structure. This is the uniqueness of the graphene-base material. Graphene is a gapless material i.e. having no bandgap energy and this property prevents it from switching device applications and also from the optoelectronic devices applications. The main challenge for this material is to tune as a semiconducting which can open the optical characteristics and emit light of desired color. There may be several possibilities for the modification of graphene-base material that can tune a band gap. One way is to find semiconducting property by doping the defects into pristine graphene structure. Other way is oxides functional groups in graphene structure behaves as defects. The physical properties of graphene depend on the amount of oxides present in graphene structure. So if there are more oxides in graphene structure then this material behaves as a insulating. By any means if it can be reduced then oxides amount to achieve specific proportion of sp2 and sp3 that can emit light of desired color. Further, after achieving light emission from graphene base material, there is more possibility for the study of non-linear optical property. In this work, plasmonic effect in graphene oxide has been focused. Mainly there are two ...
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Date: May 2016
Creator: Karna, Sanjay K
Partner: UNT Libraries

The enhancement of machine translation for low-density languages using Web-gathered parallel texts.

Description: The majority of the world's languages are poorly represented in informational media like radio, television, newspapers, and the Internet. Translation into and out of these languages may offer a way for speakers of these languages to interact with the wider world, but current statistical machine translation models are only effective with a large corpus of parallel texts - texts in two languages that are translations of one another - which most languages lack. This thesis describes the Babylon project which attempts to alleviate this shortage by supplementing existing parallel texts with texts gathered automatically from the Web -- specifically targeting pages that contain text in a pair of languages. Results indicate that parallel texts gathered from the Web can be effectively used as a source of training data for machine translation and can significantly improve the translation quality for text in a similar domain. However, the small quantity of high-quality low-density language parallel texts on the Web remains a significant obstacle.
Date: December 2007
Creator: Mohler, Michael Augustine Gaylord
Partner: UNT Libraries

Enhancement of spatial ability in girls in a single-sex environment through spatial experience and the impact on information seeking.

Description: The test scores of spatial ability for women lag behind those of men in many spatial tests. On the Mental Rotations Test (MRT), a significant gender gap has existed for over 20 years and continues to exist. High spatial ability has been linked to efficiencies in typical computing tasks including Web and database searching, text editing, and computer programming. The relationships between the components of visuospatial ability and performance are complex. However, research strongly indicates that a connection exists, and further research is necessary to determine the interactions between the variables of environment, genetics, and spatial training. Spatial experience can enhance spatial skills. However, to what extent spatial skills can be enhanced in female adolescents through a spatial curriculum to reduce the gap in scores has not been fully researched, nor has the impact of spatial skill on information seeking. This research project investigated spatial skill in adolescent females by examining (1) the extent to which the intervention of teaching a spatial curriculum in a single-sex setting could improve mental rotation test scores, and (2) the impact of spatial skills on an information seeking task in a single-sex setting. The extent to which a spatial visualization curriculum can improve MRT scores from a pretest to a posttest for girls was the first factor examined using a spatial visualization curriculum. The information seeking task used 4 tasks from a doctoral study and utilized the scholarly journal database JSTOR® (JSTOR, Ann Arbor, MI, www.jstor.org).
Date: December 2008
Creator: Swarlis, Linda L.
Partner: UNT Libraries

Enhancements of Mechanical, Thermal Stability, and Tribological Properties by Addition of Functionalized Reduced Graphene Oxide in Epoxy

Description: The effects of octadecylamine-functionalized reduced graphene oxide (FRGO) on the frictional and wear properties of diglycidylether of bisphenol-A (DGEBA) epoxy are studied using a pin-on-disk tribometer. It was observed that the addition of FRGO significantly improves the tribological, mechanical, and thermal properties of epoxy matrix. Graphene oxide (GO) was functionalized with octadecylamine (ODA), and then reduction of oxygen-containing functional groups was carried out using hydrazine monohydrate. The Raman and x-ray photoelectron spectroscopy studies confirm significant reduction in oxygen-containing functional groups and formation of ODA functionalized reduced GO. The nanocomposites are prepared by adding 0.1, 0.2, 0.5 and 1.0 wt % of FRGO to the epoxy. The addition of FRGO increases by more than an order of magnitude the sliding distance during which the dynamic friction is ≤ 0.1. After this distance, the friction sharply increases to the range of 0.4 - 0.5. We explain the increase in sliding distance during which the friction is low by formation of a transfer film from the nanocomposite to the counterface. The wear rates in the low and high friction regimes are approximately 1.5 x 10-4 mm3/N·m and 5.5 x 10-4 mm3/N·m, respectively. The nanocomposites exhibit a 74 % increase in Young’s modulus with 0.5 wt. % of FRGO, and an increase in glass transition and thermal degradation temperatures.
Date: August 2014
Creator: Shah, Rakesh K.
Partner: UNT Libraries