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 Collection: UNT Theses and Dissertations
Descriptive Set Theory and Measure Theory in Locally Compact and Non-locally Compact Groups

Descriptive Set Theory and Measure Theory in Locally Compact and Non-locally Compact Groups

Date: May 2013
Creator: Cohen, Michael Patrick
Description: In this thesis we study descriptive-set-theoretic and measure-theoretic properties of Polish groups, with a thematic emphasis on the contrast between groups which are locally compact and those which are not. The work is divided into three major sections. In the first, working jointly with Robert Kallman, we resolve a conjecture of Gleason regarding the Polish topologization of abstract groups of homeomorphisms. We show that Gleason's conjecture is false, and its conclusion is only true when the hypotheses are considerably strengthened. Along the way we discover a new automatic continuity result for a class of functions which behave like but are distinct from functions of Baire class 1. In the second section we consider the descriptive complexity of those subsets of the permutation group S? which arise naturally from the classical Levy-Steinitz series rearrangement theorem. We show that for any conditionally convergent series of vectors in Euclidean space, the sets of permutations which make the series diverge, and diverge properly, are ?03-complete. In the last section we study the phenomenon of Haar null sets a la Christensen, and the closely related notion of openly Haar null sets. We identify and correct a minor error in the proof of Mycielski that a ...
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Design of a Dual Band Gan Pa Utilizing Dual Band Impedance Transformers

Design of a Dual Band Gan Pa Utilizing Dual Band Impedance Transformers

Date: May 2013
Creator: Poe, David R.
Description: This thesis discusses the design, fabrication, and testing of a high efficiency, dual band radio frequency power amplifier. While it is difficult to demonstrate an exact mode of operation for power amplifiers at radio frequencies, based on the characteristics of the transistor itself, the argument can be made that our high efficiency performance is due to an approximation to class E operation. The PA is designed around a CGH40025 transistor manufactured by Cree, Inc, which has developed a very useful nonlinear model of its transistor, which allows use of software load/source pull methods to determine optimum impedances to be presented to the gate and drain (hereafter referred to as source and load) of the transistor at each band of operation. A recent work on dual-band impedance matching is then used to design distributed element networks in order to present conjugate matches of these impedances to the transistor. This is followed by a careful layout, after which the PA is then fabricated on a low-impedance substrate using a LPKF Protomat S63 rapid prototyping machine. Measurements of gain and drain current provide values for power-added-efficiency. Simulated gains were 21 and 18 dB at 800 MHz and 1.85 GHz, respectively, with PAE around ...
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Design of a Wideband Class J Power Amplifier

Design of a Wideband Class J Power Amplifier

Date: May 2013
Creator: Raavi, Srinivasa
Description: A conventional RF power amplifier will convert the low powered radio frequency signals into high powered signals. Along with the expected ability to increase the communication distance, data transfer rates, RF power amplifiers also have many applications which include military radar system, whether forecasting, etc. The main objective of any power amplifier research is to increase the efficiency while maintaining linearity and broadening the frequency of operation. The main motivation for the renewed interest in PA technology comes from the technical challenges and the economics of modern digital communication systems. Modern communications require high linear power amplifiers and in order to reduce the complete system cost, it is necessary to have a single broadband power amplifier, which can amplify multiple carriers. The improvement in the efficiency of the power amplifier increases the battery life and also reduces the cooling requirements for the same output power. In this thesis, I aim to design and build a wideband class J power amplifier suitable for modern communications. For wideband operation of the GaN technology PA, a bandwidth extension design method is studied and implemented. The simulation results are proved to have a good argument with the theoretical calculations.
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Determinacy-related Consequences on Limit Superiors

Determinacy-related Consequences on Limit Superiors

Date: May 2013
Creator: Walker, Daniel
Description: Laczkovich proved from ZF that, given a countable sequence of Borel sets on a perfect Polish space, if the limit superior along every subsequence was uncountable, then there was a particular subsequence whose intersection actually contained a perfect subset. Komjath later expanded the result to hold for analytic sets. In this paper, by adding AD and sometimes V=L(R) to our assumptions, we will extend the result further. This generalization will include the increasing of the length of the sequence to certain uncountable regular cardinals as well as removing any descriptive requirements on the sets.
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Determinants of the Applications to the Institutional Care in Turkey: Darulaceze Example

Determinants of the Applications to the Institutional Care in Turkey: Darulaceze Example

Date: May 2013
Creator: Esendemir, Serif
Description: Although institutional care has started to be outmoded in the developed countries with development of different models of care, it still has a considerable place in the developing countries such as Turkey. This is because, changes in the demographic structure, extended family, and urban development of Turkey has brought about several aging problems leading older adults to end up in institutions. Loneliness was one of the significant reasons given in the Social Inquiry Survey of Applicants of Darulaceze Old-Age Institution and the basis for a micro level analysis in this study. Therefore, the main objective of the study was to determine the predictors of loneliness, including age, the state of living alone, functional independence, education, and gender. Analysis of the results indicated that these predictors have significant effects on the loneliness predominantly defined by social factors rather than medical factors. In addition, the meso and macro level analyses were employed to control the micro level analysis and see a general picture of institutional care. Thus, an academic example of diagnosing the main reasons behind the institutional care was presented to understand the context of aging in Turkey.
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Dialogismo En El Cancionero De Miguel De Unamuno: Dialéctica De La Voz Poética

Dialogismo En El Cancionero De Miguel De Unamuno: Dialéctica De La Voz Poética

Date: May 2013
Creator: Sheppard, Yanina O.
Description: The present research is centered on Miguel de Unamuno's Songbook which is studied through the prism of the theory of dialogism elaborated by Mikhail Bakhtin. This study overcomes the limitation of Bakhtin's theory which extends solely to narrative genres, and argues that dialogism can also be applied to poetry. In this thesis I seek to rectify the critical oversight of this significant and original work of Unamuno and show that Songbook has panoply of innovative techniques aimed at creating the multiple poetic voices and dialogical interaction. Strong links are established between Bakhtin's theory, Unamuno's aesthetics and the postmodernist episteme of "the death of the author" which heralds the new era of fiction writing. I give a detailed analysis of Songbook's poetry based on Bakhtin's theory and incorporate the pragmalinguistic view of poetic discourse as a communicative act that involves a constant interaction between the addresser and the addressees. I find different types of dialogical expression in accordance with the number and the nature of different addressees at which the poet aims his discourse. This study shows that poetic tools forged by Unamuno are born of the need to express a conflictive inner world that is opposed to any type of ...
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Direct Strength Method for Web Crippling of Cold-formed Steel C-sections

Direct Strength Method for Web Crippling of Cold-formed Steel C-sections

Date: May 2013
Creator: Seelam, Praveen Kumar Reddy
Description: Web crippling is a form of localized buckling that occurs at points of transverse concentrated loading or supports of thin-walled structural members. The theoretical computation of web crippling strength is quite complex as it involves a large number of factors such as initial imperfections, local yielding at load application and instability of web. The existing design provision in North American specification for cold-formed steel C-sections (AISI S100, 2007) to calculate the web-crippling strength is based on the experimental investigation. The objective of this research is to extend the direct strength method to the web crippling strength of cold-formed steel C-sections. ABAQUS is used as a main tool to apply finite element analysis and is used to do the elastic buckling analysis. The work was carried out on C-sections under interior two flange (ITF) loading, end two flange (ETF) loading cases. Total of 128 (58 ITF, 70 ETF) sections were analyzed. Sections with various heights (3.5 in.to 6 in.) and various lengths (21 in. to 36 in.) were considered. Data is collected from the tests conducted in laboratory and the data from the previous researches is used, to extend the direct strength method to cold formed steel sections. Proposing a new ...
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The Disney Influence on Kindergarten Girls' Body Image

The Disney Influence on Kindergarten Girls' Body Image

Date: May 2013
Creator: Asawarachan, Tanawan
Description: Media is now a part of the early childhood world. In many countries, including industrialized and developing countries, children spend more time consuming various kinds of media. The impact of media on children's perception of their body images has been and continues to be a concern of parents and early childhood professionals. This research examined the influence of Disney movies on Thai kindergarten girls' body images and self-esteem. Thai kindergarten girls completed three measures of body self-image: the Body Figure Preference Scale, the Body Esteem Scale, and the Self-Esteem Scale. The girl participants were randomly assigned to two groups: focused on a female theme (FFT) and focused on a non-human theme (FNT). The experimental group viewed "female" Disney movie themes, while the control group viewed "animal" Disney movie themes. Girls in the experimental group expressed greater body image dissatisfaction scores after watching Disney movies, which was an expected finding. Results from the present study suggest that girls in both groups become concerned about their body esteem after video exposure. However, there was no significant difference in self-esteem between girls in FFT and FNT. In summary, the findings of this study support the belief that Disney movies influence young girls' perceptions ...
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Don Gillis's Symphony No 5½: Music for the People

Don Gillis's Symphony No 5½: Music for the People

Date: May 2013
Creator: Morrison, Sean
Description: Don Gillis wrote Symphony No. 5½ (1947) in order to reconcile the American public with modern art music. By synthesizing jazz (as well as other American folk idioms), singable melodies, and humor, and then couching them into symphonic language, Gillis produced a work that lay listeners could process and enjoy. The piece was an immediate success and was played by orchestras across the globe, but it did not retain this popularity and it eventually faded from relevancy. This study focuses on elements that contributed to the initial efficacy and ultimate decline of the work. Due to its pervasive popular influences, Symphony No. 5½ is a crystallized representation of time in which it was written, and it soon became dated. Don Gillis did not harbor the idea that Symphony No. 5½ would grant him great wealth or musical immortality; he had a more pragmatic goal in mind. He used every musical element at his disposal to write a symphonic work that would communicate directly with the American people via a musical language they would understand. He was successful in this regard, but the dialogue ended soon after mid-century.
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Down, Set, Like? A Study of Social Networking and Sports Fandom

Down, Set, Like? A Study of Social Networking and Sports Fandom

Date: May 2013
Creator: Otteson, Gabe
Description: Sports in the 21st century have become popular across multiple industries, and a major boon to a television industry dealing with increasing audience fragmentation. So an understanding of fans' behavior is important to all parties. This study, an online survey consisting of 242 responses, examined fandom and its relationship with time spent using social networking sites and found no statistical correlation. Six uses and gratification factors obtained: human connection, network content, distraction/amusement, social integration, social surveillance, and active entertainment. The low comparative saliency of the social integration factor suggests that perhaps fandom is distinct from other ways of identifying with similarly-minded individuals (e.g. political and/or religious affiliation), or that perhaps fandom as a factor is less than sufficient to explain how/why sports fans use social networking sites.
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