Thesis (M.S.)--University of Missouri-Columbia, 2008. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 12, 2009) Vita. Includes bibliographical references.

Thesis (M. Eng.)--Carleton University, 1989. / Also available in electronic format on the Internet.

Thesis (Ph.D)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009. / Committee Chair: Perry, Joseph W.; Committee Member: Kippelen, Bernard; Committee Member: Lyon, L. Andrew; Committee Member: Marder, Seth R.; Committee Member: Whetten, Robert L. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (M.S.)--University of Missouri-Columbia, 2004. / Typescript. Includes bibliographical references (leaves 65-67). Also available on the Internet.

Thesis (M.S.)--University of Missouri-Columbia, 2004. / Typescript. Includes bibliographical references (leaves 65-67). Also available on the Internet.

Thesis (M.S.)--Rochester Institute of Technology, 2007. / Typescript. Includes bibliographical references (leaves 61-62).

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 83-85). Also available via the Internet.

Orientador: Neri Alves / Banca: Roberto Mendonça Faria / Banca: Clarissa de Almeida Olivati / O Programa de Pós Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi / Resumo: A eletrônica orgânica é muito atrativa para a fabricação de circuitos flexiveis e de grande área a partir de soluções em solventes orgânicos. Entretanto, dispositivos totalmente orgânicos devem incluir transitores, e estes ainda necessitam ser aprimorados para que possam ser comercializados, sendo que os principais desafios são aumentar a capacidade de chaveamento de corrente e melhorar a estabilidade. Estes fatores podem estar relacionados com as propriedades dos semicondutores orgânicos, como a distribuição das bandas de energia, mecanismo de transporte de cargas, mobilidade dos portadores, entre outros. Assim, as equações convencionais de semicondutores inorgânicos devem ser devidamente adaptadas para que possam ser aplicadas aos dispositivos orgânicos. Nesta dissertação estuda-se o capacitador metal-isolante-semicondutor (MIS), que é usualmente, caracterizado através de medidas de capacitância e perde dielétrica em função de freqüência e da voltagem. Representa-se a amostra por circuitos equivalentes para simular as curvas de capacitância e perda dielétrica em função da voltagem. Um circuito básico que serve como gabarito, onde os demais efeitos podem ser inclusos, é apresentado, e dentre esses efeitos são estudados a análise da camada de acumulação, estados interfaciais e a interação do MIS com a luz. Mostra-se que as curvas de capacitância e perda dialética simuladas reproduzem adequadamente o comportamento dos estados interfaciais gerando um pico nas curvas de perda dielétrica em função da voltagem, cuja posição e intensidade variam com a densidade de estados interfaciais, a probabilidade de captura e a frequencia. Também é estudada a geração de portadores devido a iluminação. Os efeitos da iluminação podem ser modelados incluindo um capacitar no... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The organic electronics is very attractive for manufacturing flexibe and large area circuits using solutions with organic with organic solvents. However, all-organic devices must include transistors, which need improvements in order to be commercialized, being the main challenges the increasing on the current switching capability and the improving on the stability. These factors may be related with the properties of organic semiconductors, such as the energy band distribution, charge transport mechanisms, mobility and others. Thus, the equations used to conventional inorganic semiconductors must be adapted for its application to the organic devices. In this dissertation the metal-insulator-semiconductor (MIS) capacitor is studied, which is usually characterized by capacitance and dielectric loss measurements as a function of frequency and voltage. The sample is represented by equivalent circuits in order to simulate the capacitance and the dielectric loss curves as a function of voltage. A basic circuit that serves as a template were other effects can be included is presented and, among these effects, the accumulation layer, the interfacial states and the light interaction with the MIS device are studied. It is shown that the curves simulated for capacitance and dielectric loss properly reproduce the interfacial states behavior, with a peak in the dielectric loss curves as a function of voltage, whose intensity and position change with the interfacial state density, capture probability and frequency. The carrier generation due to the illumination is also studied. The illumination effects can be modeled by the inclusion of a capacitor in the equivalant circuit, which capacitance depends on factors such as light intensity, generation rate and capture and recombination of carriers. It is also shows that the proposed... (Complete abstract click electronic access below) / Mestre

Made available in DSpace on 2014-06-11T19:30:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-02-27Bitstream added on 2014-06-13T20:40:10Z : No. of bitstreams: 1 sabino_fp_me_bauru.pdf: 1321310 bytes, checksum: 513dea01548c252c52555e2e8e1fb4f1 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / A eletrônica orgânica é muito atrativa para a fabricação de circuitos flexiveis e de grande área a partir de soluções em solventes orgânicos. Entretanto, dispositivos totalmente orgânicos devem incluir transitores, e estes ainda necessitam ser aprimorados para que possam ser comercializados, sendo que os principais desafios são aumentar a capacidade de chaveamento de corrente e melhorar a estabilidade. Estes fatores podem estar relacionados com as propriedades dos semicondutores orgânicos, como a distribuição das bandas de energia, mecanismo de transporte de cargas, mobilidade dos portadores, entre outros. Assim, as equações convencionais de semicondutores inorgânicos devem ser devidamente adaptadas para que possam ser aplicadas aos dispositivos orgânicos. Nesta dissertação estuda-se o capacitador metal-isolante-semicondutor (MIS), que é usualmente, caracterizado através de medidas de capacitância e perde dielétrica em função de freqüência e da voltagem. Representa-se a amostra por circuitos equivalentes para simular as curvas de capacitância e perda dielétrica em função da voltagem. Um circuito básico que serve como gabarito, onde os demais efeitos podem ser inclusos, é apresentado, e dentre esses efeitos são estudados a análise da camada de acumulação, estados interfaciais e a interação do MIS com a luz. Mostra-se que as curvas de capacitância e perda dialética simuladas reproduzem adequadamente o comportamento dos estados interfaciais gerando um pico nas curvas de perda dielétrica em função da voltagem, cuja posição e intensidade variam com a densidade de estados interfaciais, a probabilidade de captura e a frequencia. Também é estudada a geração de portadores devido a iluminação. Os efeitos da iluminação podem ser modelados incluindo um capacitar no... / The organic electronics is very attractive for manufacturing flexibe and large area circuits using solutions with organic with organic solvents. However, all-organic devices must include transistors, which need improvements in order to be commercialized, being the main challenges the increasing on the current switching capability and the improving on the stability. These factors may be related with the properties of organic semiconductors, such as the energy band distribution, charge transport mechanisms, mobility and others. Thus, the equations used to conventional inorganic semiconductors must be adapted for its application to the organic devices. In this dissertation the metal-insulator-semiconductor (MIS) capacitor is studied, which is usually characterized by capacitance and dielectric loss measurements as a function of frequency and voltage. The sample is represented by equivalent circuits in order to simulate the capacitance and the dielectric loss curves as a function of voltage. A basic circuit that serves as a template were other effects can be included is presented and, among these effects, the accumulation layer, the interfacial states and the light interaction with the MIS device are studied. It is shown that the curves simulated for capacitance and dielectric loss properly reproduce the interfacial states behavior, with a peak in the dielectric loss curves as a function of voltage, whose intensity and position change with the interfacial state density, capture probability and frequency. The carrier generation due to the illumination is also studied. The illumination effects can be modeled by the inclusion of a capacitor in the equivalant circuit, which capacitance depends on factors such as light intensity, generation rate and capture and recombination of carriers. It is also shows that the proposed... (Complete abstract click electronic access below)

Reactive power compensation, as generated by capacitors, has been used to mitigate the constraints of power transmission and improve the power transfer of the transmission system of the South African power utility, Eskom‟s 66/22kV Albany-Wesley transmission system. An investigation was carried out on a number of current compensation schemes, and their operations, by means of load flow analysis. Different capacitor qualities and technologies were applied to alter the transmission line characteristics that resulted in acceptable voltage regulation. This resulted in easing the load on the lines and transformers and hence reducing line losses. For long transmission lines, utilities need voltage support, as provided for by different voltage compensators, to keep the terminal voltage within standard voltage regulation, and meet the designed power demand. The approach to large and small scale compensation was tested and the outcomes revealed distinct patterns that were used to confirm the hypothesis and improve the transfer of power. The templating temperature and thermal perspective as used by Eskom on line design was discussed and used to design a new transmission line. Load flow solutions were also used to plan and design the optimised transmission system as well as to determine the specification and location of the compensating capacitor banks. Capacitor banks, as a source of reactive power, were used to model the compensation in this research. Electrical protection and faults associated with the capacitors banks were discussed, as prevention to total blackout or load shedding on the transmission line in case of established contingency. Long term investment plans, to meet future electricity demands, require substantial investment hence a financial survey was carried out. Finally this dissertation selects a viable solution to meet the electrical power demands and then recommends a way forward for the Eskom‟s 66/22kV Albany-Wesley line.