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440 Matching Results
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Biogeography of Montane Mammals on the Colorado Plateau and Adjacent Regions
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This study identifies the biogeographic factors that structure small mammal communities on mountains of the Colorado Plateau and adjacent regions. Forty six isolated ranges were characterized across a 5-state study area encompassing the Colorado Plateau, including the central high plateaus of Utah and the Basin and Range Province (i.e. the Great Basin and mountains of Arizona and New Mexico). Presence/absence data of 25 montane mammal species were used to explore the interactions between historical and ecological processes affecting local and regional diversity patterns. Multivariate analyses, such as non-metric dimensional scaling, were used to explore factors which influence community composition. Results of these analyses revealed the Colorado River as a significant biogeographic barrier that affects montane mammal community structure. MtDNA cytochrome b sequence variation was analyzed among populations of the long-tailed vole, Microtus longicaudus, sampled from five interior ranges of the Colorado Plateau- Abajo, LaSal, Henry, and Chuska Mts., and Boulder Mountain of the Aquarius Plateau-and analyzed using traditional phylogenetic approaches (parsimony and likelihood) as well as nested clade analysis. Results support previous documentation of a major east-west phylogeographic break occurring between populations southeast of the Colorado River (eastern Arizona, Colorado, Wyoming and New Mexico) and all other western populations, which …
Date:
May 2004
Creator:
Carr, Carla B.
System:
The UNT Digital Library
Utilization of Corridor Habitat by White-tailed Deer (Odocoileus virginianus) in Denton County, Texas
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White-tailed deer (Odocoileus virginianus) (N=15) movements were determined with use of radio telemetry techniques to determine the utilization of corridor habitat on the Lake Ray Roberts Greenbelt Corridor (RRGC) in north central Texas. Home ranges were calculated using three estimation types. Male white-tailed deer tend to have home ranges twice that of female home ranges. Seasonal home ranges were largest during spring (Feb. - April) and fall (Aug. - Oct.) seasons. Males had greater seasonal variation in utilization than females. No statistically significant difference (p=0.24) between white-tailed deer locations when the RRGC experiences heavy human traffic compared to days when there is light human traffic. Linearity indices indicated home ranges less linear than expected (LI = 3.02). The RRGC should be maintained at its current status to provide a variety of vegetational types and protective cover for white-tailed deer and other wildlife of Denton County.
Date:
May 2004
Creator:
Bruce, Troy Kenneth
System:
The UNT Digital Library
City of Denton Municipal Solid Waste Characterization and Management Strategies
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Due to concern about diminishing landfill space, the City of Denton contracted a municipal solid waste characterization study in 1999 that would identify materials for diversion. This paper describes the results of 5 1-week waste sorting events, a scale-house analysis, a recycling participation study, a recycler profile and a similar city study. The results of the characterization studies suggest that at least 50% of each waste stream is recyclable or divertible though paper products accounted for no more than 45% by weight of any waste stream. Curbside recycling participation rate was 71% during the 6-week study period though the average weekly set-out rate was 37%. Recycling participation rates varied significantly by zip code and by home value categories but not by gender. Denton is fairly progressive in its waste management approach when compared to demographically similar cities on a 15-question assessment though recommendations for improvement have been identified.
Date:
May 2004
Creator:
Brady, Patricia D.
System:
The UNT Digital Library
A Detailed Proof of the Prime Number Theorem for Arithmetic Progressions
We follow a research paper that J. Elstrodt published in 1998 to prove the Prime Number Theorem for arithmetic progressions. We will review basic results from Dirichlet characters and L-functions. Furthermore, we establish a weak version of the Wiener-Ikehara Tauberian Theorem, which is an essential tool for the proof of our main result.
Date:
May 2004
Creator:
Vlasic, Andrew
System:
The UNT Digital Library
A Personal Expression
The problem involves developing a method that leaves conventional form and form making and moves toward a spontaneous and intuitive approach. The thesis is organized into 3 chapters. The first chapter includes an introduction, statement of the problem and methodology. The second chapter describes the work in eight movements. The third chapter answers questions posed by the problem and includes a summary and conclusion. The findings are that a spontaneous, impulsive, and intuitive approach to the medium, clay, is a productive and artistic method. The medium is responsive and telling of the method and art is produced.
Date:
May 2004
Creator:
Veatch, Nancy Carole Steveson
System:
The UNT Digital Library
Studies in regiospecific oxidation reactions of 1-methyl-pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione.
Baeyer-Villiger oxidation of 1-methylpentacyclo[5.4.0.02,6.03,10.05,9] undecane-8,11-dione, performed by using m-chloroperbenzoic acid in 1:1 molar ratio, resulted in the formation of monolactone. The corresponding dilactone, was synthesized by reacting 1-methyl-PCU-8,11-dione with m-chloroperbenzoic acid in 1:2 molar ratio. 6-Methyl-1,4,4a,8a-tetrahydro-1,4-methanonaphthalene-5,8-dione was converted into the corresponding exo-6,7-monoepoxide via treatment with 30% aqueous hydrogen peroxide. Epoxidation of this monoepoxide by using m-chloroperbenzoic acid afforded the corresponding bis-epoxide. Ceric ammonium nitrate (CAN) promoted oxidation of 1-methyl-PCU-8,11-dione afforded "methylated lactones" and a "methylated alkene."
Date:
May 2004
Creator:
Vappala, Indu
System:
The UNT Digital Library
Simulation of local watershed nutrient and sediment delivery to Lake Texoma.
A hydrologic model and watershed export model was used to estimate the loading of nutrients and total suspended solids from un-gaged local watersheds associated with Lake Texoma. Discharge to the reservoir from local watersheds was predicted using a modification of the curve number method in HEC Hydrologic Modeling System (HEC-HMS). Event mean concentrations were applied to land use to estimate loadings of nutrients and TSS. Total discharge from the local watersheds was estimated to be 3.02 x 107 cubic meters for a study window of March 1 to May 31, 1997, less than 10 percent of the input to the lake from the Red River and Washita River systems. Loadings were estimated to be 33,553 kg nitrogen, 4,401 kg phosphorus, and 3,423,140 kg TSS. The models and results obtained from their application appear to have potential utility for use in a water quality management decision support system for the reservoir.
Date:
May 2004
Creator:
Upton, Alexandra C.
System:
The UNT Digital Library
An Analysis of the Genesis of Motive, Rhythm, and Pitch in the First Movement of the Sonata for Two Pianos and Percussion by Béla Bartók.
This dissertation presents evidence that Béla Bartók created his masterwork, the Sonata for Two Pianos and Percussion (1937), in a very complex period of his life. Since it was a mature piece, Bartók utilized typically "Bartókian" compositional techniques and styles. His ethnomusicological studies were also influential factors in the creation of the Sonata for Two Pianos and Percussion. We can be witness to how different the first draft was to the published version; the minor and major changes are revealed in the draft study of the Sonata for Two Pianos and Percussion 's first movement. These changes allow today's musicians to reconstruct the compositional process. The first movement introduces some interesting uses of sonata form, to be explored in more detail in the analysis. Starting with linear analysis, the basic motives and rhythmic patterns are discussed and supported with Bartók's own explanations. The conclusion of this study has important ramifications for performance: it eases up the pressure on the performers, since problematic passages are analyzed and explained - preparing the players' mentally for the performance. This is music which is hard to play and difficult to analyze. The analysis, combining the results of both theoretical and musicological studies, is intended …
Date:
May 2004
Creator:
Ujj-Hilliard, Emöke
System:
The UNT Digital Library
New Reality Resembles Old: An Examination of the American Public's Social Construction of Reality Following September 11, 2001 Terrorist Attacks
This thesis examines whether the September 11, 2001 terrorist attacks caused a significant, lasting change in the American public's social construction of reality. A framework of everyday reality was created which focused on beliefs, behaviors, and cultural institutions in the United States. Data regarding specific beliefs and behaviors was collected from numerous survey sources, and content analysis was performed on media literature from September 11, 2001 to September 11, 2003. Findings from this study show that beliefs examined did change, while behaviors on similar topics did not. These finding represents an interesting paradox to be evaluated in future studies. Cultural institutions, as related to the public's knowledge of and relationship with each, also appeared little changed. Therefore, while some aspects displayed adjustment, this study cannot conclusively state that American public's social construction of reality experienced a "new reality" paradigm shift as proclaimed by the media immediately following the attacks.
Date:
May 2004
Creator:
Stoutmeyer, Stacie L.
System:
The UNT Digital Library
Crystalline Surface Challenge
Ever since I became interested in the world of ceramics, crystalline glazes have been the most fascinating and challenging to me. Even though crystalline glazes are the most difficult and elusive to potters, their spectacular results (when done right) keep me coming back. Over the last year I have developed a crystalline glaze that yields consistent and excellent results. During this period, I have worked with these glazes in the traditional manor, being that they are only applied to smooth porcelain vessels. My proposal will be to attempt crystalline glazes on different surface textures.
Date:
May 2004
Creator:
Rostagno, Nicholas
System:
The UNT Digital Library
A Mythic Perspective of Commodification on the World Wide Web
Capitalism's success, according to Karl Marx, is based on continued development of new markets and products. As globalization shrinks the world marketplace, corporations are forced to seek both new customers and products to sell. Commodification is the process of transforming objects, ideas and even people into merchandise. The recent growth of the World Wide Web has caught the attention of the corporate world, and they are attempting to convert a free-share-based medium into a profit-based outlet. To be successful, they must change Web users' perception about the nature of the Web itself. This study asks the question: Is there mythic evidence of commodification on the World Wide Web? It examines how the World Wide Web is presented to readers of three national publications-Wired, Newsweek, and Business Week-from 1993 to 2000. It uses Barthes' two-tiered model of myths to examine the descriptors used to modify and describe the World Wide Web. The descriptors were clustered into 11 general categories, including connectivity, social, being, scene, consumption, revolution, tool, value, biology, arena, and other. Wired articles did not demonstrate a trend in categorical change from 1993 to 2000; the category of choice shifted back and forth between Revolution, Connectivity, Scene, and Being. Newsweek …
Date:
May 2004
Creator:
Robinson, Glendal Paul
System:
The UNT Digital Library
The Effects of Teacher Certification on Freshman High School Students' Algebra I Achievement
The purpose of this study was to determine whether students taught by certified teachers and those taught by uncertified teachers had significantly different achievement on a state Algebra I End of Course examination. The specific research questions were: (1) Does type of teacher certification impact Algebra I End of Course (EOC) Exam scores for high school freshman when controlling for students' past mathematics success as measured by 8th grade TAAS mathematics test scores and teachers' years of experience? (2) Does type of teacher certification impact Algebra I End of Course (EOC) Exam passage rates for high school freshman when controlling for students' past mathematics success as measured by 8th grade TAAS mathematics test scores, socio-economic status, ethnicity, gender, and teachers' years of experience? This research was conducted in a large north Texas suburban school district. The entire population (N=1,433) of freshman students enrolled in year-long Algebra I was included for this study. Three statistical tests were used in data analysis for the first question. Analysis of covariance using student as well as teacher as the unit of analysis and hierarchical multiple regression were used to analyze students' specific scores. Logistic regression was used for the second research question. This study …
Date:
May 2004
Creator:
Ringrose, Laura Chamberlin
System:
The UNT Digital Library
Moving in a New Direction: An Exploration in Kinetics
Movement, whether conveyed through an actual motion or a gestured implication, remains an underlying theme in my creative process that started with my earliest works. I explored different aspects of kinetic sculpture, because I am seeking new ways to create motion such as experimenting with circulating air, wind, and the use of water features. I created a series consisting of three to five kinetic sculptures which do not rely on sound or direct viewer manipulation.
Date:
August 2004
Creator:
Illy, Etienne
System:
The UNT Digital Library
A general purpose semantic parser using FrameNet and WordNet®.
Syntactic parsing is one of the best understood language processing applications. Since language and grammar have been formally defined, it is easy for computers to parse the syntactic structure of natural language text. Does meaning have structure as well? If it has, how can we analyze the structure? Previous systems rely on a one-to-one correspondence between syntactic rules and semantic rules. But such systems can only be applied to limited fragments of English. In this thesis, we propose a general-purpose shallow semantic parser which utilizes a semantic network (WordNet), and a frame dataset (FrameNet). Semantic relations recognized by the parser are based on how human beings represent knowledge of the world. Parsing semantic structure allows semantic units and constituents to be accessed and processed in a more meaningful way than syntactic parsing, moving the automation of understanding natural language text to a higher level.
Date:
May 2004
Creator:
Shi, Lei
System:
The UNT Digital Library
A study of the technology leadership of Texas high school principals.
Effectively integrating technology into school requires the presence of informed and visionary leadership. Past research on change in schools demonstrates the importance of the principal to that process. In that research it is obvious that the principal must possess more than skills and knowledge about the change, he or she must also possess leadership skills to lead the campus through the change. Despite this finding, very little research has been attempted to determine the leadership knowledge and skills of principals for technology integration. This study attempts to investigate the technology leadership of high school principals in Texas using the National Educational Technology Standards for Administrators (NETS*A). In addition, this study compares technology leadership among principals who have attended the Technology Leadership Academy with those who have not attended this training. The two questions that guided this study are: (1) What are the technology leadership actions of Texas' high school principals in each of the six technology leadership standards identified by the NETS*A standard document? (2) How are the technology leadership practices of high school principals who participated in the Technology Leadership Academy sponsored by TASA and TBEC different from those who have not participated in the training? Because no existing …
Date:
May 2004
Creator:
Seay, D. Alan
System:
The UNT Digital Library
The Effects of Sign Language on the Vocal Responses of a Child with Autism.
Sign language is an effective form of alternative communication for persons with autism and other developmental disabilities. Only a few studies have systematically measured the effects of sign language on the vocal responses of its users. This study employed a multiple baseline design to evaluate the effects of sign language on the vocal responses of a four-year-old boy with autism. Results indicate that a reinforcement contingency placed only on sign responses is inadequate for maintaining vocal responses. When a reinforcement contingency is placed on sign responses as well as vocal responses that the user is capable of emitting in verbal imitation, both sign and vocal responses are maintained. Results are discussed in terms of the need for a reinforcement contingency placed on vocal and sign responses, the effects of teaching procedures on response variability, and the need for future research to examine procedures utilized to teach sign language to persons within the developmental disabilities population.
Date:
May 2004
Creator:
Scarbro-McLaury, Jill
System:
The UNT Digital Library
Some String or Another: Fiction and Nonfiction Stories of Connection
Some String or Another: Fiction and Nonfiction Stories of Connection, a creative thesis, explores patterns of change in stories from the perspective of connection and disconnection. The preface examines the effects of temporal disconnection, the relationship of conflict and connection to narrative rhythm, and the webs of connection formed during the process of creation. Included in the body of the work are six fiction stories, one metafiction story, and two nonfiction essays.
Date:
May 2004
Creator:
Salts, Diane Michelle
System:
The UNT Digital Library
Judicial Enforcers? Exploring Lower Federal Court Compliance in Regulating the Obscene
Although federal circuit and district court judges are placed within a federal hierarchy, and receive legal and judicial training that emphasizes the importance of the judicial framework and its structure, such judges are also subjected to other pressures such as the types of litigants within the courtrooms as well as their local political environment. Furthermore, such judges are apt to form their own views about politics and legal policy and are often appointed by presidents who approve of their ideological leanings. Thus, federal courts are caught between competing goals such as their willingness to maximize their preferred legal policy, and their place within the judicial hierarchy. This dissertation applies hierarchy and impact theory to assess the importance of the judicial framework and its socialization, by analyzing both the judicial opinions and votes of federal circuit and district court judges in obscenity cases during a four-decade period (1957-1998). The research presented here finds the influence of higher court precedent to correspond in part with the conception of a judicial hierarchy. An analysis of citations of Supreme Court precedent (Roth v. United States (1957) and Miller v. California (1973)) in lower court majority opinions suggests low levels of compliance: lower courts at …
Date:
May 2004
Creator:
Ryan, John Francis
System:
The UNT Digital Library
Effects of Thickness and Indenter Tip Geometry in Nanoindentation of Nickel Films
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Nanoindentation has become a widely used technique to measure the mechanical properties of materials. Due to its capability to deform materials in micro- and nano-scale, nanoindentation has found more applications in characterizing the deformation behavior and determining the mechanical properties of thin films and coatings. This research deals with the characterization of samples received from Center for Advanced Microstructures and Devices (CAMD) and Integran Technologies Inc., Toronto, Canada and the objective of this investigation was to utilize the experimental data obtained from nanoindentation to determine the deformation behavior, mechanical properties of thin films on substrates and bulk materials, and the effect of geometrically different indenters (Berkovich, cubecorner, and conical). X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM) analysis were performed on these materials to determine the crystal orientation, grain size of the material, and also to measure any substrate effects like pile-up or sin-in respectively. The results indicate that indentation size effect (ISE) strongly depends on shape of the indenter and less sensitive to penetration depth where as the hardness measurements depends on shape of indenter and depth of penetration. There is a negligible strain rate dependency of hardness at deeper depths …
Date:
May 2004
Creator:
Parakala, Padma
System:
The UNT Digital Library
The Relationship of Acculturation Stress and Leisure Satisfaction of Hispanic College Students
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Use of this item is restricted to the UNT Community
Hispanics are the fastest growing minority group in the U.S. and signs indicate a similar trend in their college enrollment. Leisure activities are known to have a moderating effect on individuals experiencing stress in their lives. Hispanic organizations registered with a major 4-year metropolitan university were targeted. The hypothesis for this study was there is no relationship between acculturation stress and leisure satisfaction. Results indicate no relationship between acculturation stress and leisure satisfaction. One explanation for this lack of a significant relationship between these two measures might be that these college students had obtained a high level of acculturation, which would explain the relatively low level of acculturation stress reported.
Date:
May 2004
Creator:
Pacleb, Selverio V.
System:
The UNT Digital Library
Design of Power Amplifier Test Signals with a User-Defined Multisine
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Use of this item is restricted to the UNT Community
Cellular radio communication involves wireless transmission and reception of signals at radio frequencies (RF). Base stations house equipment critical to the transmission and reception of signals. Power amplifier (PA) is a crucial element in base station assembly. PAs are expensive, take up space and dissipate heat. Of all the elements in the base station, it is difficult to design and operate a power amplifier. New designs of power amplifiers are constantly tested. One of the most important components required to perform this test successfully is a circuit simulator model of an entire communication system that generates a standard test signal. Standard test signals 524,288 data points in length require 1080 hours to complete one test of a PA model. In order to reduce the time taken to complete one test, a 'simulated test signal,' was generated. The objective of this study is to develop an algorithm to generate this 'simulated' test signal such that its characteristics match that of the 'standard' test signal.
Date:
May 2004
Creator:
Nagarajan, Preeti
System:
The UNT Digital Library
Exhaustivity, continuity, and strong additivity in topological Riesz spaces.
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Use of this item is restricted to the UNT Community
In this paper, exhaustivity, continuity, and strong additivity are studied in the setting of topological Riesz spaces. Of particular interest is the link between strong additivity and exhaustive elements of Dedekind s-complete Banach lattices. There is a strong connection between the Diestel-Faires Theorem and the Meyer-Nieberg Lemma in this setting. Also, embedding properties of Banach lattices are linked to the notion of strong additivity. The Meyer-Nieberg Lemma is extended to the setting of topological Riesz spaces and uniform absolute continuity and uniformly exhaustive elements are studied in this setting. Counterexamples are provided to show that the Vitali-Hahn-Saks Theorem and the Brooks-Jewett Theorem cannot be extended to submeasures or to the setting of Banach lattices.
Date:
May 2004
Creator:
Muller, Kimberly O.
System:
The UNT Digital Library
Polymorphous
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Use of this item is restricted to the UNT Community
The first section explores how far I could stretch dichotomy in formal terms, while maintaining a visually resonant image. I wanted to manipulate a superficial surface filtered through "natural forms" as seen in scientific imagery. By this I wanted to create access to a place where forms could play and imagination could wander. I was seeking to find a confluence in seemingly opposing forces that would coexist in the same work. The second section answers questions I had established for myself. The most important discovery I made was about the true nature of what I called a dichotomy in my work. The last section discusses the conclusions drawn from mounting the Master of Fine Arts Exhibition. I found that my interests resided more in investigating an already confluent dualism, as opposed to reconciling a conflicting dichotomy.
Date:
May 2004
Creator:
Maxwell, Sarah
System:
The UNT Digital Library
A Wet Etch Release Method for Silicon Microelectromechanical Systems (MEMS) Using Polystyrene Microspheres for Improved Yield
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Use of this item is restricted to the UNT Community
One of the final steps in fabricating microelectromechanical devices often involves a liquid etch release process. Capillary forces during the liquid evaporation stage after the wet etch process can pull two surfaces together resulting in adhesion of suspended microstructures to the supporting substrate. This release related adhesion can greatly reduce yields. In this report, a wet etch release method that uses polystyrene microspheres in the final rinse liquid is investigated. The polystyrene microspheres act as physical barriers between the substrate and suspended microstructures during the final liquid evaporation phase. A plasma ashing process is utilized to completely remove the polystyrene microspheres from the microstructure surfaces. Using this process, release yields > 90% were achieved. It is found that the surface roughness of gold surfaces increases while that of the silicon is reduced due to a thin oxide that grows on the silicon surface during the plasma process.
Date:
May 2004
Creator:
Mantiziba, Fadziso
System:
The UNT Digital Library