Master of Music / School of Music, Theatre, and Dance / Patricia Thompson / This thesis will examine musical game changers in a chronological order. It will discuss how composers have redefined the face of their musical genre and comment on how the past of music affects the future of music. In addition, the following contents will make a case for the idea that individuals listen with their eyes. I will examine the effect that costumes and their design have on both the audience and the performers. The sixty minutes Masters Recital that is the basis of this thesis will consist works by the following composers and librettists: Christoph Willibald Gluck, George Bickwell, Theodore Kennick, William Schwenck Gilbert, Arthur Sullivan, Leoš Janáček, Jerome Kern, Oscar Hammerstein, Kurt Weill, Ira Gershwin, Moss Hart, Richard Rodgers, Oscar Hammerstein II, Benjamin Britten, Galt MacDermot, Gerome Ragni, James Rado, Stephen Sondheim, Marvin Hamlisch, Edward Kleban, Andrew Lloyd Webber, Catherine Johnson, Benny Anderssohn, Björn Ulvaeus, and Lin Manuel-Miranda. The recital will feature selections from Orfeo ed Euridice, The Black Crook, The Pirates of Penzance, Jenůfa, Show Boat, Lady in the Dark, Carousel, Peter Grimes, Hair, Company, A Chorus Line, Evita, Mamma Mia, and Hamilton: An American Musical. Each selection will be will be musically and dramatically analyzed as well as discussed from a costume design standpoint.

Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008. / Committee Chair: Laskar Joy; Committee Member: Cressler John; Committee Member: Tentzeris Emmanouil

Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record.

A crescente demanda energética mundial é um dos principais problemas a ser enfrentado pela sociedade, uma vez que, a produção de energia elétrica na atualidade tem sua base em combustíveis fósseis, os quais possuem reservas não perenes e seus efeitos maléficos ao meio ambiente tem causado um impacto muito grande na natureza. Estes fatores têm incentivado a busca por alternativas para produção de energia elétrica a partir de fontes renováveis, principalmente em unidades de Geração Distribuída. A energia solar fotovoltaica se destaca neste contexto principalmente por sua flexibilidade quanto à potência e o ponto de conexão dos geradores, indo ao encontro do conceito de Geração Distribuída. Visando a expansão do emprego de geradores fotovoltaicos a redução do custo da energia gerada é fundamental, para tanto se deve conceber conversores eletrônicos capazes de adequar a energia CC produzida pelos geradores para que esta seja diretamente injetada na rede elétrica CA. No caso de geradores com um único módulo fotovoltaico, tem-se a oportunidade de extrair a máxima potência gerada pelo mesmo evitando-se problemas de sombreamento e dissimilaridades entre módulos, todavia o emprego de conversores eletrônicos com alto ganho de tensão com a maior eficiência possível é imprescindível. Nesta dissertação é proposta uma nova metodologia de integração de conversores estáticos, permitindo que novos conversores estáticos não isolados com alto ganho de tensão sejam derivados. Esta metodologia baseia-se no emprego de indutores acoplados que são compartilhados pelos conversores integrados e cujas seções e terminais são associados de modo que a topologia resultante possua um ganho de tensão que corresponde a soma dos ganhos individuais de cada conversor. Como exemplo e estudo de caso é analisada a integração dos conversores boost e flyback. São apresentados os modos de operação e as principais características dos conversores boost-flyback derivados neste trabalho, bem como uma metodologia de projeto para os circuitos e resultados experimentais. Os protótipos avaliados em laboratório mostram que os conversores boost-flyback derivados operando com ganho estático de dez vezes podem obter eficiência superior a 90% quando aplicados em um painel fotovoltaico de 200W. / World increasing demand for energy is one of the most challenging problems to be faced by societies in the near future. And it is getting worst because the fossil fuels retain the majority of the world energy share. Besides the risk of outage caused by the depletion of fossil fuel sources, their side effects on the environment have causing a huge impact on the environment. These issues have motivating the search for renewable sources of energy, mainly in distributed generation units. In the renewable resources scenario, the photovoltaic energy has a major role due to its advantages, such as its power flexibility and easy on site placement of generators, which is very favorable for Distributed Generators Systems. Aiming to ensure the worldwide applications of PV systems, it is required to lower the PV energy cost per watt, which can be achieved with more efficient power processing systems that are used to convert the DC power produced by the PV modules in AC power to be injected to the grid. In systems with a power converter per PV module the best performance of the module is achieved in terms of energy efficiency, avoiding shadowing and aging dissimilarity problems that may plague PV generators with a large amount of PV modules. However, to achieve such benefits, power converters with high efficiency and large conversion range are required. In this dissertation it is proposed a novel methodology to synthesize integrated non-isolated DC/DC power converters with wide conversion range. This methodology is based on the use of coupled inductors to integrate the input sections of two power converters, meanwhile their output sections are associated in either, series, parallel or cascade configuration, yielding in a conversion ratio that is the sum of the individual integrated converters. As a case study, the integrated boost-flyback topologies are analyzed. Their modes of operation, chief characteristics as well as design rules are discussed. The analyses are validated by means of experimental results obtained from three laboratory prototypes. The prototypes operate with conversion ratio greater than ten times and the efficiency achiever is higher than 90% when designed for a 200W PV module.

A crescente demanda energética mundial é um dos principais problemas a ser enfrentado pela sociedade, uma vez que, a produção de energia elétrica na atualidade tem sua base em combustíveis fósseis, os quais possuem reservas não perenes e seus efeitos maléficos ao meio ambiente tem causado um impacto muito grande na natureza. Estes fatores têm incentivado a busca por alternativas para produção de energia elétrica a partir de fontes renováveis, principalmente em unidades de Geração Distribuída. A energia solar fotovoltaica se destaca neste contexto principalmente por sua flexibilidade quanto à potência e o ponto de conexão dos geradores, indo ao encontro do conceito de Geração Distribuída. Visando a expansão do emprego de geradores fotovoltaicos a redução do custo da energia gerada é fundamental, para tanto se deve conceber conversores eletrônicos capazes de adequar a energia CC produzida pelos geradores para que esta seja diretamente injetada na rede elétrica CA. No caso de geradores com um único módulo fotovoltaico, tem-se a oportunidade de extrair a máxima potência gerada pelo mesmo evitando-se problemas de sombreamento e dissimilaridades entre módulos, todavia o emprego de conversores eletrônicos com alto ganho de tensão com a maior eficiência possível é imprescindível. Nesta dissertação é proposta uma nova metodologia de integração de conversores estáticos, permitindo que novos conversores estáticos não isolados com alto ganho de tensão sejam derivados. Esta metodologia baseia-se no emprego de indutores acoplados que são compartilhados pelos conversores integrados e cujas seções e terminais são associados de modo que a topologia resultante possua um ganho de tensão que corresponde a soma dos ganhos individuais de cada conversor. Como exemplo e estudo de caso é analisada a integração dos conversores boost e flyback. São apresentados os modos de operação e as principais características dos conversores boost-flyback derivados neste trabalho, bem como uma metodologia de projeto para os circuitos e resultados experimentais. Os protótipos avaliados em laboratório mostram que os conversores boost-flyback derivados operando com ganho estático de dez vezes podem obter eficiência superior a 90% quando aplicados em um painel fotovoltaico de 200W. / World increasing demand for energy is one of the most challenging problems to be faced by societies in the near future. And it is getting worst because the fossil fuels retain the majority of the world energy share. Besides the risk of outage caused by the depletion of fossil fuel sources, their side effects on the environment have causing a huge impact on the environment. These issues have motivating the search for renewable sources of energy, mainly in distributed generation units. In the renewable resources scenario, the photovoltaic energy has a major role due to its advantages, such as its power flexibility and easy on site placement of generators, which is very favorable for Distributed Generators Systems. Aiming to ensure the worldwide applications of PV systems, it is required to lower the PV energy cost per watt, which can be achieved with more efficient power processing systems that are used to convert the DC power produced by the PV modules in AC power to be injected to the grid. In systems with a power converter per PV module the best performance of the module is achieved in terms of energy efficiency, avoiding shadowing and aging dissimilarity problems that may plague PV generators with a large amount of PV modules. However, to achieve such benefits, power converters with high efficiency and large conversion range are required. In this dissertation it is proposed a novel methodology to synthesize integrated non-isolated DC/DC power converters with wide conversion range. This methodology is based on the use of coupled inductors to integrate the input sections of two power converters, meanwhile their output sections are associated in either, series, parallel or cascade configuration, yielding in a conversion ratio that is the sum of the individual integrated converters. As a case study, the integrated boost-flyback topologies are analyzed. Their modes of operation, chief characteristics as well as design rules are discussed. The analyses are validated by means of experimental results obtained from three laboratory prototypes. The prototypes operate with conversion ratio greater than ten times and the efficiency achiever is higher than 90% when designed for a 200W PV module.

In this phenomenological study I investigated the experiences of early second-career, tenure-track faculty members who entered academe after working in a position outside of higher education for at least five years. The purpose of this study was to learn about experiences and factors that contributed or impeded to the success of second-career faculty members. Eight early second-career faculty members, from a four-year university located in the Dallas Metroplex area, were interviewed. Participants demographics were ages 34 to 68 with the average age being 45; 50% male and 50% female; and one African American, six Caucasian, and one Hispanic and/or Latino. Participants’ previous professional experience was a benefit in teaching and relating to students, in understanding the complex university bureaucracy, and in setting goals. The participants reported that mentoring, whether formally assigned by the institution or through informal means such as departmental colleagues or professional organizations, was a benefit to all of the participants. A primary area of concern for the participants was collaboration and collegiality with other faculty members. Participants stated that traditional faculty members lack the skills and training to collaborate effectively in researching and in joint teaching endeavors. Participants reported that they had to monitor and restrain their opinions during interactions with departmental colleagues during the probationary period leading up to tenure decisions because the participants fear retaliation by co-faculty members who will vote on whether to grant them tenure. These participants bring a wealth of industry experience and knowledge to the university. Administrators, departmental chairs, and future early second-career faculty members will find that this research provides recommendations that, if heeded, will ensure a long and productive mutually beneficial affiliation.

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In this work, a programmable frequency divider suitable for millimeter wave phase-lock loops is presented. The frequency divider has been implemented in a 90 nm standard CMOS technology. To the extent of maximizing the operative input frequency, the higher frequency digital blocks of the frequency divider have been realized using dynamic precharge-evaluation logic. Moreover, a non-conventional method to implement non-power-of-2 division ratios has been used for the higher frequency divider stages (input stages).

Este trabalho trata sobre a utilização de técnicas de comutação suave aplicadas `a conversores estáticos de potência. A técnica analisada em particular consiste em proporcionar comutação em zero de tensão aos interruptores controlados, sendo referenciada na literatura como Zero Voltage Switching (ZVS). Dentre as diversas topologias de circuitos que implementam a técnica ZVS, neste trabalho é utilizada uma célula de comutação Zero Voltage Transition (ZVT), no qual utiliza interruptores controlados e elementos em paralelo com o circuito principal. O foco do trabalho é a aplicação desta célula ZVT a um conversor CC-CA PWM monofásico com saída senoidal. Nesse sentido inicialmente é feita uma revisão das topologias básicas dos inversores, é das técnicas PWM utilizadas para obtenção de saída senoidal. São apresentados os circuitos ZVT convencional e aprimorado descritos na literatura, no qual o ZVT aprimorado é empregado ao conversor CC-CA ponte completa. São apresentadas as etapas de funcionamento e análise matemática. É descrita uma metodologia de projeto para a determinação dos componentes do circuito auxiliar, com base em restrições definidas para o correto funcionamento da célula e das características dos semicondutores utilizados como chave. Um protótipo do conversor é implementado em laboratório para a validação do projeto, verificação das formas de onda nos interruptores e análise do rendimento. Outros dois circuitos de auxílio à comutação são implementados para efeitos de comparação, sendo o circuito ZVT convencional e o dissipativo snubber de Undeland. Os resultados experimentais comprovam a obtenção da comutação suave nos interruptores e o conversor apresentou rendimento de no mínimo 1% superior ao ZVT convencional e 2% ao snubber de Undeland, valores estes para toda a faixa de carga. / This paper discusses above the application of soft-switching techniques to static power conver-ters. The technique discussed in particular consists in provide zero voltage switching (ZVS) to controlled switches. Among the various circuit topologies to implement the ZVS technique, in this work is used a cell Zero-Voltage Transition (ZVT), in which uses controlled switches and elements in parallel with the main circuit. The main objective of the work is the application of this cell ZVT to a single-phase PWM inverter with sinusoidal output. In this sense initially is made a review of the basic topologies of inverters , and of the PWM techniques used to obtain sinusoidal output. Are presented the circuits ZVT conventional and improved described in the literature, in which the improved ZVT is employed on DC-AC full bridge converter. Steps of operation and mathematical analysis are presented. A design methodology is described for the determination of the components of the auxiliary circuit, based on constraints set for the correct functioning of the cell and of the characteristics of semiconductor. A prototype of the converter is implemented in the laboratory for the validation of the project, verification of waveforms the switches and analysis of efficiency. This converter is compared with other two circuits, ZVT conventional and the Undeland snubber. Experimental results show the achievement of soft switching the switches and the converter presenting an efficiency of at least 1% over for the ZVT conventional and 2% to the undeland snubber, these values for all load range.