Submitted by Morgana Silva (morgana_linhares@yahoo.com.br) on 2016-07-26T17:16:36Z No. of bitstreams: 1 arquivototal.pdf: 3263751 bytes, checksum: 7ac8739b55aa723353d94f530579f4fc (MD5) / Made available in DSpace on 2016-07-26T17:16:36Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3263751 bytes, checksum: 7ac8739b55aa723353d94f530579f4fc (MD5) Previous issue date: 2015-11-27 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / In the current global scenario, the power sector crisis is evident, and to maintain an economic development compatible with this growth, many countries are investing in energy production from many different sources, renewable and clean or not, to supply the growing demand. The integration of these new energy sources demands realtime coordination. Thus, monitoring units need to be reliable besides a good processing and data transmission are needed. In this paper it’s proposed to implement a data acquisition system for current and voltage signals with a low cost embedded platform, focused in hardware programation coupled with the acquisition and conditioning module to apply a Smart Grid concept.This system are responsible for performing analysis of voltage and current provided from electrical grid and transform these informations to readable informations for embedded platform, making possible manipulate this informations from surpevisory systems. With these data, the supervisory systems can analyze and make decisions based on information provided by the platform and use to apply in different concepts present in Smart Grid, such as energy flow control, minimizing the effects of electricity lack, design of distributed generation from renewable sources, identification of energy theft, reduction of technical losses, power monitoring and others. To develop this system was used a Beaglebone Black© development platform, associated with a module for conditioning unit of voltage and current signals, that module was developed by the Optimization Lab Power Systems program (LOSE) of the Electrical Engineering Department (DEE) from Federal University of Paraíba (UFPB). This module is responsible for conditioning the signal voltage and current supplied by the power grid adapting them to the specifications required for reading and conversion in Beaglebone Black© development platform. / No atual cenário mundial, a crise do setor elétrico está cada vez mais evidente, e para se manter um nível de desenvolvimento econômico compatível com este crescimento, muitos países estão investindo no aumento da produção de energia elétrica a partir de diversas fontes, sejam estas renováveis e limpas ou não, para suprir a crescente demanda. A integração dessas novas fontes de energia demanda coordenação em tempo real. Desta forma, unidades confiáveis de monitoramento, processamento e transmissão de dados são necessárias. Neste trabalho propõe-se a implementação de um sistema para aquisição de dados para sinais de tensão e corrente, por meio de uma plataforma de desenvolvimento embarcado de baixo custo associado com foco na programação de hardware, aliado a um módulo de aquisição e condicionamento de sinais para aplicação do conceito de Redes Elétricas Inteligentes - REI (do inglês Smart Grid). O sistema é responsável por realizar a leitura da tensão e da corrente fornecidos pela rede elétrica e transformar-los para informações analisáveis pela plataforma de desenvolvimento, possibilitando assim, a manipulação por sistemas supervisórios. Em posse destes dados, os sistemas supervisórios podem, além de analisar, tomar decisões baseadas nas informações fornecidas pela plataforma e utilizar-las para aplicar em diversos conceitos presentes nas REIs, tais como controle do fluxo de energia, minimização dos efeitos da falta da energia elétrica, concepção de geração distribuída a partir de fontes renováveis, identificação de furtos de energia, redução de perdas técnicas, monitoramento da qualidade de energia e outros. Para o desenvolvimento deste sistema foi utilizado a plataforma de desenvolvimento Beaglebone Black©, associada a uma unidade de condicionamento de sinais de tensão e corrente desenvolvido pelo Progama de Pós-Graduação em Engenharia Elétrica no Laboratório de Otimização de Sistemas de Energia (LOSE) do Departamento de Engenharia Elétrica (DEE), da Universidade Federal da Paraíba (UFPB). Este módulo é reponsável por condicionar os sinais de tensão e corrente fornecidos pela rede elétrica adequando-os às especificações necessárias para leitura e conversão na plataforma de desenvolvimento Beaglebone Black©.

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Among the figures of the Scientific Revolution, Galileo was the most influential in moving science away from Aristotle’s concept of scientific explanation to what became Modern science. My primary goal in this thesis is to explicate Galileo’s concept of scientific explanation, as well as the metaphysical and methodological underpinnings relied upon by Galileo, and to investigate where these depart from Aristotle as well as the Aristotelians of Galileo’s time. Galileo’s most revolutionary scientific achievement was to advance a new, more practical aim for scientific inquiry: he changed the focus of scientific investigations to the measuring, modeling, and predicting of phenomena. In order to increase the reliability of his hypotheses Galileo rejected those aspects of Aristotle’s account of scientific explanation that could not be rigorously empirically justified. The result was that empirical science no longer searched for the essential attributes of bodies or for Aristotle’s causes such as the “final” cause. The identified contributions and innovations promulgated by Galileo are significant because they dictated changes that became formative to contemporary models of scientific explanation. I argue that analyses such as the one given in this dissertation can provide a framework for better understanding twentieth-century criticisms that argue that Aristotle’s concept of scientific explanation contained elements that are indispensable to genuine scientific explanations but that are missing from standard contemporary accounts such as Hempel’s covering law models. Finally, I conclude that my analysis of Galileo’s contributions to scientific explanation suggests that contemporary claims that covering law models should be more receptive to Aristotle’s ideas of causation and essence are misguided. / text

Made available in DSpace on 2015-04-22T22:18:27Z (GMT). No. of bitstreams: 1 Jerry Luiz Soares.pdf: 672406 bytes, checksum: e88bbef6ba318d131d840409b6860292 (MD5) Previous issue date: 2013-07-18 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Galileo Galilei supported Nicolaus Copernicus astronomic theory, from which the former has attracted philosophical as well theological consequences. The celestial discoveries made possible with the usage of spyglasses allowed Galileo to challenge some of the aristotelic principles of cosmology and to break up the limits imposed to astronomy as hypothetical discipline which would aim just to "save the phenomena". / Galileu Galilei defendeu a teoria astronômica de Nicolau Copérnico, e dela extraiu consequências filosóficas e teológicas. As descobertas celestes com a utilização da luneta permitiram a Galileu questionar alguns princípios da cosmologia aristotélica, e romper os limites impostos à Astronomia, enquanto disciplina hipotética que teria como objetivo tão somente "salvar os fenômenos".

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Les systèmes de navigation par satellite sont connus pour être sensibles aux interférences. Cette thèse étudie les techniques d'antennes adaptatives comme une solution au problème du brouillage des signaux militaires (GPS et Galileo) par des interférences de forte puissance et à grande occupation spectrale. L'objectif est de réaliser, à terme, une antenne réseau indépendante du récepteur de radionavigation, ce qui nous a rapidement conduit à privilégier les systèmes MISO.<br />Divers algorithmes de traitement ont été évalués sur plusieurs géométries de réseau. Nous avons mis en évidence que le SINR moyen de sortie du réseau n'est pas représentatif des performances d'un récepteur de radionavigation. Un critère de sélection des méthodes, basé sur la précision finale de localisation, a donc été défini. Nous avons montré que, selon ce critère, la connaissance a priori des DOA ne permet pas forcément de gain de traitement avec un système MISO. La stabilité de la réponse des réseaux a également été étudiée, nous conduisant finalement à restreindre notre étude aux méthodes aveugles de minimisation de puissance sous contrainte linéaire. <br />Nous avons ensuite caractérisé les principaux défauts de la chaîne RF (dus aux dispersions de fabrication des capteurs et des filtres analogiques, et au couplage inter-capteurs) et en avons évalué l'impact sur les performances des filtres spatiaux. Physiquement, comme l'effet large bande, les défauts du réseau se traduisent par une augmentation du nombre de degrés de liberté consommés par un signal de forte puissance. Le traitement Spatio-Temporel (STAP) constitue une solution possible à cette augmentation du rang du sous-espace interférent car il permet d'accroitre le nombre de degrés de liberté disponibles, sans augmenter la taille du réseau. Cependant, la composante fréquentielle du filtrage STAP peut dégrader les performances du corrélateur d'un récepteur GNSS générique. Aussi, avons-nous défini un nouveau critère de performance, adapté au traitement des signaux GNSS. Nous avons ainsi pu écrire le filtre STAP optimal et nous en avons déduit une version simplifiée qui constitue un bon compromis performances - complexité.<br /> Globalement, le réseau STAP ne permet pas de gain de traitement sur la puissance utile transmise au récepteur mais il permet de mieux rejeter les signaux interférents de forte puissance en présence de défauts linéaires de chaîne.

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In the next coming years global satellite navigation systems (GNSS) will make part of our daily life, as the world is becoming "GNSS-dependant in the same way that it has become Internet-dependant". Indeed, more than ten years folowing the opening up to civilians of satellite-based navigation systems initially designed for military purposes, civil satellite navigation applications are becoming more and more numerous. The potential benefits have proven enormous in terms of transport safety and efficiency as well as for non-transport-related industries. / Dans les toutes prochaines années, les systèmes globaux de navigation par satellite (GNSS) feront partie intégrante de notre vie quotidienne. En effet, un peu plus de dix ans après la libéralisation de l'accès des civils aux systèmes de navigation par satellite initialement conçus à des fins militaires, les applications civiles permises par la navigation par satellite sont de plus en plus nombreuses et les bénéfices potentiels sont énormes en matière de sécurité et d'efficacité des transports comme pour d'autres secteurs et industries. fr

"Author biographies are available in the expanded on-line version of this article [http://www.insidegnss.com/auto/julyaug09-tetewsky-final.pdf]" / "July/August 2009." Web site title: Making Sense of GPS Inter-Signal Corrections : Satellite Calibration Parameters in Legacy and Modernized Ionosphere Correction Algorithms.