Thesis (Ph. D.)--Ohio State University, 2009. / Title from first page of PDF file. Includes bibliographical references (p. 229-238).

The research presented in this doctoral dissertation introduces a developmental path to realize micro coaxial transmission lines for wafer-level microwave and millimeter wave circuits. The micro coax lines conceptualized in this research are three-dimensional, with a uniquely low vertical profile of 20 mu m. They are distinguishable from other transmission line topologies due to frequency limitless, cross-talk free performance in high density circuits resulting from the totally shielded construction. Design and optimization was done using equations and electromagnetic simulations. Extensive process development has been carried out to fabricate these devices on CMOS grade silicon wafers using processes amenable to the IC manufacturing industry. Micro coax lines of three different core types including air, semi-dielectric and all-dielectric cores were designed, fabricated and analyzed from 1 - 40 GHz with respect to line impedance and the volume of polyimide (dielectric) in the micro coax cavity. The insertion loss of the lines was found to vary from 2 to 9 dB/cm depending on the width the center conductor, total cross-sectional area and core type. The versatility of the micro coax technology developed in the earlier part of this research has been successfully integrated with RF MEMS to embed a MEM varactor inside the micro coax cavity capable of achieving a capacitance ratio around 7 with an actuation voltage of 40 - 60V. The vertical integration capability of the micro coax was demonstrated by locating a millimeter wave slot antenna on the top side shield of a rectangular micro coax line, also acting as the electromagnetically coupled feed for the antenna. The antenna was designed to operate in the full range of the unlicensed 57 - 64 GHz spectrum capable of Gbps data rates. A 15 dB bandwidth of 17% and a hemispherical radiation pattern was achieved. Lastly, a diversified application involving the application of an integrated micro coax probe-microfluidic chamber approach to detect bacteria through impedance measurements has been introduced. In summary, the development and implementation of micro coax technology on a large scale is bound to create a paradigm shift in the development of high density microwave and millimeter wave circuits for RF MEMS and integrated antennas.

Na indústria de petróleo e gás as tubulações são formas eficientes de transportar esses produtos ou seus derivados das regiões de exploração para as refinarias e em alguns casos até o consumidor. O principal tipo de aço utilizado na fabricação dessas tubulações são os aços ARBL que devido à boa relação entre resistência à tração e tenacidade a baixas temperaturas geram uma boa relação custo/benefício na utilização e na montagem de tubulações. Neste trabalho é apresentado um estudo sobre a soldabilidade do tubo API 5L X80 construído com aço ARBL. Os corpos-de-prova utilizados foram anéis de 508 mm de diâmetro externo com espessura de parede de 19,0 mm. A soldagem foi executada com o processo eletrodo revestida no experimento 1, em um par de anéis, e o outro par de anéis foi soldado, na raiz, com o processo de soldagem MAG-TC e nos passes de enchimento e acabamento foi utilizado o processo arame tubular auto-protegido. Os resultados dos ensaios de resistência à tração, dobramento lateral e de Nick-Break demonstram que ambos os procedimentos de soldagem são qualificados pela norma API 1104. Associando o resultado do ensaio de Charpy V a 0°C e associando-o a quantificação das frações volumétricas de microconstituintes MA e a caracterização microestrutural é possível observar que os valores de energia absorvida na ZAC tem maior relação com o mecanismo de refino de grão, que melhora os valores obtidos, do que com a quantidade de fração volumétrica do microconstituinte MA. / In the oil and gas industries, pipelines are efficient ways of transporting these products, or its derivatives, from exploration regions to refineries and, in some cases, up to the final consumer. The main type of steel used in manufacturing these pipelines are HSLA steels that, due to the good relationship between tensile strength and toughness at low temperatures, create a cost/benefit ratio in the use and installation of these pipelines. This paper presents a study on the weldability of API 5L X80 HSLA pipe steel. The samples used were pipe rings with 508 mm outside diameter and a wall thickness of 19.0 mm. The root welding process was performed using SMAW in Experiment 1 with filing and finishing passes with SMAW. In the second experiment, the root pass were welded with GMAW-CT, and filling and finishing passes with FCAW-SS. Tensile test results, lateral bending tests and \'Nick-Break\' tests showed that both welding procedures were qualified according to API 1104 Standard. Associating these results with Charpy V test at 0°C and with quantification of volume fractions of MA microconstituent is possible to observe that the values of absorbed energy in the HAZ are more closely related to the mechanism of grain refinement, which improves the values obtained with the volume fraction of the amount of microconstituent MA.

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<p>The aim of the research work presented here, is to contribute to the adaptation of electronic packaging towards the needs of high frequency applications. As the field of electronic packaging stretches over several very different professional areas, it takes an interdisciplinary approach to optimize the technology of electronic packaging. Besides this, an extensive knowledge of industrial engineering should be an essential part of this undertaking to improve electronic packaging. Customary advances in technology are driven by new findings and a continuous development of processes in clearly defined fields. However, in the field of the higher levels of the interconnection hierarchy, that is external to the chip level interconnections and chip packaging, it is supposed that a wide combination of disciplines and technical creativity, instead of advanced technology in a special area should produce most added value.</p><p>The thesis is divided into five areas, interlinked by the overall aim of there advantages to the common goal. These areas are the Printed Wiring Board (PWB) technology, PWB connections using flexible printed circuit boards, multiconductor cable connections, shielded enclosures and the related EMC issues, and finally the cooling of electronics. A central issue was to improve the shielded enclosures to be effective also at very high frequencies; it will be shown that shielded enclosures without apertures can cope with frequencies up to and above 15 GHz. Due to this enclosure without apertures, it was necessary to develop a novel cooling structure. This cooling structure consists of a heat sink where the PCB’s are inserted in close contact to the cooling fins on one side, whereas the other side of the heat sink is cooled by forced ventilation. The heat transfer between these parts is completely inside the same body. Tests carried out on a prototype have shown that the performance of the cooling structure is satisfactory for electronic cooling.</p><p>Another problem area that is addressed are the interconnect problems in high frequency applications. Interconnections between parts of a local electronic system, or as within the telecom and datacom field between subscribers, are commonly accomplished by cable connections. In this research work multiconductor cables are examined and a patented novel cable-connector for high frequency use is presented. Further, an experimental complex soldering method between flexible printed circuits boards and rigid printed circuits boards, as part of connections between PCBs, is shown. Finally, different sectors of the PCB technology for high frequency applications are scrutinized and measurements on microstrip structures are presented.</p>

Submitted by SBI Biblioteca Digital (sbi.bibliotecadigital@puc-campinas.edu.br) on 2018-04-13T17:02:28Z No. of bitstreams: 1 MIRI? JOYCE DE SOUZA SALES CAPRA.pdf: 1182210 bytes, checksum: a2d25865f4668b2ada5c633fc2706532 (MD5) / Made available in DSpace on 2018-04-13T17:02:28Z (GMT). No. of bitstreams: 1 MIRI? JOYCE DE SOUZA SALES CAPRA.pdf: 1182210 bytes, checksum: a2d25865f4668b2ada5c633fc2706532 (MD5) Previous issue date: 2017-12-06 / The " Cult of the Princesses" by the pastor Sarah Sheeva and the tv program "Shielded Marriage" by the journalist Cristiane Cardoso raise questions about female empowerment, it's relationship with the liquid modernity, the media and the the conceptualization of weberian charismatic domination, thinking about the importance of the gender discussion on the religious field, an urgent and needed step. According to this, this dissertation tries to understand the the phenomenon of the charismatic domination of female religious leaders that use the media resources and which are the reason of this acceptance in a time that a revolution in gender relationships have been implemented mainly inside the religious field. In terms of research methodology, it was used a sociological analysis from videos available on their youtube channels, with the general goal to understand the acceptance of a conservative religious speech delivered by social medias. It was concluded that inside the liquid modernity proposed by Zygmunt Bauman, the agreement with the retrograde message, enunciated by two women by the media is accepted, because it proposes a kind of "confort", "safety" to the the ephemeral relations of this society. Contributing to interpret this religious phenomenon that makes pseudo female empowerment throught the binominal of modernity versus tradition. / O ?Culto das Princesas? da pastora Sarah Sheeva e o programa ?Casamento Blindado? da jornalista Cristiane Cardoso suscitam questionamentos no que tange ao empoderamento feminino, sua rela??o com a modernidade l?quida, a m?dia e a conceitua??o do tipo ideal de domina??o carism?tica weberiana, visto a import?ncia da discuss?o de g?nero no campo religioso, uma demanda urgente e necess?ria. Face a isso, a presente disserta??o procura compreender o fen?meno da domina??o carism?tica por lideran?as religiosas femininas que se utilizam de recursos midi?ticos e qual o motivo dessa aceita??o num momento em que se implementou uma revolu??o nas rela??es de g?nero principalmente dentro do campo religioso. No que tange ? metodologia de pesquisa, foi realizada an?lise sociol?gica a partir de v?deos dispon?veis no canal do youtube de ambas, com o objetivo geral de compreender a aceita??o de um discurso religioso conservador proferido atrav?s das redes sociais. Chegou-se ? conclus?o de que dentro da modernidade l?quida proposta por Zygmunt Bauman, a concord?ncia com a mensagem retr?grada, enunciada por duas mulheres atrav?s da m?dia, ? aceita, pois prop?e uma esp?cie de ?conforto?, ?seguran?a? ?s rela??es ef?meras pr?prias desta sociedade, contribuindo para interpretar esse fen?meno religioso que produz um ?pseudo? empoderamento feminino atrav?s do bin?mio modernidade versus tradi??o.

The aim of the research work presented here, is to contribute to the adaptation of electronic packaging towards the needs of high frequency applications. As the field of electronic packaging stretches over several very different professional areas, it takes an interdisciplinary approach to optimize the technology of electronic packaging. Besides this, an extensive knowledge of industrial engineering should be an essential part of this undertaking to improve electronic packaging. Customary advances in technology are driven by new findings and a continuous development of processes in clearly defined fields. However, in the field of the higher levels of the interconnection hierarchy, that is external to the chip level interconnections and chip packaging, it is supposed that a wide combination of disciplines and technical creativity, instead of advanced technology in a special area should produce most added value. The thesis is divided into five areas, interlinked by the overall aim of there advantages to the common goal. These areas are the Printed Wiring Board (PWB) technology, PWB connections using flexible printed circuit boards, multiconductor cable connections, shielded enclosures and the related EMC issues, and finally the cooling of electronics. A central issue was to improve the shielded enclosures to be effective also at very high frequencies; it will be shown that shielded enclosures without apertures can cope with frequencies up to and above 15 GHz. Due to this enclosure without apertures, it was necessary to develop a novel cooling structure. This cooling structure consists of a heat sink where the PCB’s are inserted in close contact to the cooling fins on one side, whereas the other side of the heat sink is cooled by forced ventilation. The heat transfer between these parts is completely inside the same body. Tests carried out on a prototype have shown that the performance of the cooling structure is satisfactory for electronic cooling. Another problem area that is addressed are the interconnect problems in high frequency applications. Interconnections between parts of a local electronic system, or as within the telecom and datacom field between subscribers, are commonly accomplished by cable connections. In this research work multiconductor cables are examined and a patented novel cable-connector for high frequency use is presented. Further, an experimental complex soldering method between flexible printed circuits boards and rigid printed circuits boards, as part of connections between PCBs, is shown. Finally, different sectors of the PCB technology for high frequency applications are scrutinized and measurements on microstrip structures are presented. / QC 20101006

The electromagnetic compatibility (EMC) problem in the railway propulsion system is a significant safety issue of high concern. The problems can be caused by any part of the propulsion system as well as any combination of the sub systems. Simulation is a fast economical way to understand the system and to predict the EMC performance. In this thesis, the propulsion system is studied partly from the rectifier to the motor. To simulate the rectifier, a two level pulse width modulation (PWM) controlled rectifier is built in Simulink. Time domain line current as well as frequency domain spectra is studied. The spectrum changing according to time variation is obtained. In order to study the high derivative of switching pulse in the insulated gate bipolar transistor (IGBT), a simple circuit is proposed to investigate it. The high frequency noise spectrum is given and the variation of the spectrum due to the reverse recovery time of the ant-parallel diode is also demonstrated. Transmission line theory is used to model the cable used to connect the inverter and motor. The method to extract the characteristic capacitance and inductance matrices of the cable system is presented. Decoupling these characteristic matrices is required for modeling the multiconductor transmission line (MTL) in PSpice. A simple way to decouple them is thus proposed here. Through the simulation studies, we analyze the oscillation and overvoltage in the cable. A fourth cable with optimized layout is also illustrated here to reduce the oscillation on the line. Furthermore, the relationship between the length of line and the noise frequency is studied. Shielding is another way to reduce the electromagnetic (EM) coupling of power lines. The method to model shielded cables in PSpice is given in this thesis. Based on the model we have investigated the shielding effect and analyzed the impact of different grounding conditions on the shielding performance. / QC 20110321

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