High Frequency Constraints on the Layout of Wide Band Gap-Based Power Electronic Assemblies Within Shielded Enclosures

Since its integration into power electronic converters, the value proposition of wide band gap semiconductors has yet to be holistically realized due to the high frequency effects associated with increased switching speeds. The United States Navy’s Smart Ship System Design (S3D) platform enables the investigation of wide band gap-based devices in shipboard Medium Voltage Direct Current (MVDC) Integrated Power and Energy Systems (IPES) through the use of metaheuristic model-based scaling laws. These physics-based scaling laws are produced from a virtual prototyping approach which takes into account the discrete building blocks associated with multi-cell based power conversion and distribution equipment and can be used to predict size, weight, losses, cost and reliability. In present practice, the discrete building blocks consist of power electronic assemblies laid out and enclosed within shielded enclosures. In an effort to incorporate the high frequency effects associated wide band gap-based Power Electronic Building Blocks (PEBB) into the virtual prototyping approach, a mathematical model which captures the high frequency effects is formulated in this thesis

Ways of seeing

This review focuses on a book which was published originally in 1972 and has become very influential on the fields of art criticism, semiotics, and image reading. One importante feature of the book is that it relies heavily on images to convey its message, which is intended not only for the expert but also (if not primarily) for the general public

Temporality and History in Spinoza:The Refusal of Teleological Thought

Spinoza’s philosophy is often characterized as a philosophy sub specie aeternitatis where time and temporality are notions without an expressive role. Consequently, understanding human history by means of the Ethics — using geometric demonstrations supported by metaphysical terms — and without the aid of the notion of time, can be considered as leading to an unsolvable problem. In this chapter, I draw upon Spinoza’s refusal of finalism to propose a renewed investigation about Spinozism and the issue of temporality, asking the question: could the absence of time in Spinoza’s work and his writings on efficient and immanent causality allow us to rethink a theory of history

High Frequency Constraints on the Layout of Wide Band Gap-Based Power Electronic Assemblies Within Shielded Enclosures

Since its integration into power electronic converters, the value proposition of wide band gap semiconductors has yet to be holistically realized due to the high frequency effects associated with increased switching speeds. The United States Navy’s Smart Ship System Design (S3D) platform enables the investigation of wide band gap-based devices in shipboard Medium Voltage Direct Current (MVDC) Integrated Power and Energy Systems (IPES) through the use of metaheuristic model-based scaling laws. These physics-based scaling laws are produced from a virtual prototyping approach which takes into account the discrete building blocks associated with multi-cell based power conversion and distribution equipment and can be used to predict size, weight, losses, cost and reliability. In present practice, the discrete building blocks consist of power electronic assemblies laid out and enclosed within shielded enclosures. In an effort to incorporate the high frequency effects associated wide band gap-based Power Electronic Building Blocks (PEBB) into the virtual prototyping approach, a mathematical model which captures the high frequency effects is formulated in this thesis

Planejamento para o manejo de dejetos de suínos: estudo de caso Bacia dos Fragosos, Concórdia/SC

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia AmbientalA ocupação desordenada do espaço rural e a utilização incorreta de seus recursos vêm causando sérios problemas sociais, econômicos e ambientais em várias regiões do Brasil. A Região Oeste Catarinense merece especial atenção devido a sua importância para a economia do Estado e pela atual situação de degradação ambiental causada pela sua principal atividade econômica: a suinocultura. O objetivo principal deste trabalho é desenvolver uma metodologia de planejamento para o manejo de dejetos de suínos, a fim de contribuir para a recuperação ambiental e o desenvolvimento sustentável da Bacia Hidrográfica dos Fragosos, localizada em Concórdia, Estado de Santa Catarina. Para tanto, analisou-se uma das microbacias que a compõe e gerou-se os seguintes mapas em escala 1 : 10.000: limite das propriedades, viário, uso do solo, fisiografia, aptidão das terras e planialtimétrico. Estas informações, adicionadas às já publicadas por outros pesquisadores, possibilitaram: calcular o excesso de dejetos de suínos por propriedade, demonstrar a vantagem da utilização dos dejetos de suínos como fertilizantes, calcular os custos para a reforma das esterqueiras subdimensionadas, calcular o custo para transportar os dejetos excedentes e identificar sistemas de tratamento mais adequados para cada propriedade, considerando aspectos físicos, legais e econômicos

Questões sobre o Mestrado Profissional e Multidisciplinar: A Experiência do Mestrado em Gestão Integrada em Saúde do Trabalho e Meio Ambiente – SENAC/SP

Compondo a problemática da pós-graduação profissional e multidisciplinar Considerando primeiramente o tema proposto para este Encontro sobre a interdisciplinaridade na pós-graduação, uma das possibilidades que pensamos em trazer seria um pouco da discussão sobre algumas questões epistemológicas que temos nos deparado sobre como percebemos a configuração do desenvolvimento técnico-científico contemporâneo e suas implicações no ensino superior e pesquisa brasileiras. O perceptível aumento na abertura de cursos e estudos pós-graduados nos últimos anos nas áreas assim denominadas multi ou interdisciplinares indica mudanças no panorama da configuração das ciências e convidam a nos perguntar se se faz necessária um debruçar-se sobre os domínios e territórios determinados pelas ciências e conhecimentos ditos disciplinares e a necessidade de ultrapassar tais limites. Temos discutido um pouco sobre essas questões porque estão postas no nosso cotidiano: estamos coordenando cursos de uma nova área ou estamos solicitando..

Por uma ciência sucessora ecofeminista: uma crítica da dicotomia aparência-realidade subjacente

Neste artigo percorro um caminho pela História da Filosofia que parte do poema de Parmênides e vai até a Revolução Científica dos Séculos XVI e XVII, com o objetivo de expor algumas etapas fundamentais do processo que levou à supervalorização daquelas metodologias de pesquisa científica que Hugh Lacey denominou “estratégias descontextualizadas”. Ao fazer isto, revisito a temática feyerabendiana da crítica à busca ocidental por uma realidade subjacente distinta das aparências, trazendo-a para o contexto da crítica feminista contemporânea da ciência, que tem denunciado as hierarquias de valor e correspondentes formas de dominação ensejadas pelo pensamento dicotómico, aquele que traduz a complexidade do mundo em pares de opostos como razão e sentimento, cultura e natureza, sujeito e objeto, heterossexual e homossexual, homem e mulher ou, no caso de que tratarei aqui, realidade subjacente e aparência sensível. Defendo que a busca por um conhecimento universalizante expresso em leis, com a correspondente desvalorização epistêmica da singularidade irredutível da experiência sensível, se mostrou muito eficaz para o controle e a mercantilização da natureza, mas é incompatível com uma ciência sucessora ecofeminista capaz de regenerar o planeta e proporcionar melhores condições de vida para todas as pessoas e animais que nele habitam.&nbsp

Effects of geological structures on rainfall‐runoff responses in headwater catchments in a sedimentary rock mountain

Clarifying rainfall-runoff responses in mountainous areas is essential for disaster prediction as well as water resource management. Although runoff is considered to be significantly affected by topography, some previous studies have reported that geological structures also have significant effects on rainfall-runoff characteristics. Particularly in headwater catchments located in sedimentary rock mountains, dips and strikes may significantly affect rainwater discharge. In this study, the effects of geological structures on rainfall-runoff characteristics were investigated based on observed discharge hydrographs from 12 catchments, which lie radially from the summit of a sedimentary rock mountain. The results obtained were as follows: (1) Even though the topographic wetness index (TWI) distributions of the 12 catchments were similar, there were significant differences in their runoff characteristics; (2) Catchments with average flow direction oriented towards the strike direction (strike-oriented catchments) are characterized by large baseflows; (3) Catchments with average flow direction oriented towards the opposite dip direction (opposite dip-oriented catchments) are steep, and this results in quick storm runoff generation; (4) Catchments with average flow direction oriented toward the dip direction (dip-oriented catchments) are gentle, and this results in delayed storm runoff generation. It was presumed that in strike-oriented catchments, large quantities of groundwater flowing along the bedding planes owing to hydraulic anisotropy, exfiltrate and sustain the large amount of the observed baseflow, that is, in strike-oriented catchments, runoff is directly controlled by geological structures. Conversely, in opposite dip-oriented and dip-oriented catchments, runoff is indirectly controlled by geological structures, that is, geological structures affect slope gradients, which result in differences in storm runoff generation. Thus, this study clearly illustrates that geological structures significantly affect rainfall-runoff responses in headwater catchments located in sedimentary rock mountains