This introductory oceanography text is intended to teach students the tremendous influence oceans have on our lives. They are encouraged to look at oceanography as a cohesive and united discipline rather than a collection of subjects gathered under a marine umbrella. Investigating Oceanography teaches students about the historical, geological, physical, chemical and biological characteristics of the ocean environment using remarkable images and photos. The authors have incorporated essays written by several scientists discussing topics in their fields of specialization. In addition to understanding processes and principles, the authors believe students must have a basic command of the language of marine science in order to understand the constant barrage of information concerning our planet and marine issues. By the end of this course, the authors want students to be prepared for future environmental discussions and the ability to make decisions as informed global citizens.
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Keith Sverdrup is a professor at the University of Wisconsin - Milwaukee.
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Paperback. Etat : Good. Para obter um grande n mero de n veis de tens o de sa da com interruptores m nimos, apresenta um inversor multin vel de ponte-H em cascata que emprega fontes trin rias de corrente cont nua. Beneficiando da topologia trin ria do inversor, nove n veis podem ser sintetizados com o menor n mero de componentes. Particularmente, um inversor de nove n veis uma optimiza o no n mero de n veis para um determinado n mero de transistores de pot ncia em conversores de pot ncia. A principal desvantagem da topologia convencional o grande n mero de fontes de alimenta o e semicondutores necess rios para obter estas formas de onda de tens o em v rias etapas. A topologia proposta reduz significativamente o n mero de IGBT's e o seu circuito condutor de porta medida que o n mero de n veis de sa da aumenta. O inversor proposto pode sintetizar uma tens o de sa da de alta qualidade perto de ondas sinusoidais. A configura o do circuito simples e f cil de controlar. Neste livro foram apresentadas, avaliadas e analisadas t cnicas de SPWM de Amplitude Vari vel Bipolar baseadas em inversores de n vel de fonte trif sica de nove n veis. O objectivo deste livro reduzir a tens o de comuta o e obter a tens o de sa da com m ltiplas etapas para alcan ar o THD mais baixo e melhorar o VRMS fundamental. N° de réf. du vendeur CIN126056603XG
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