FPGA field oriented control of an axial flux motor-in-wheel

This paper presents the design and the prototype implementation of a three-phase power inverter developed to drive a motor-in-wheel. The control system is implemented in a FPGA (Field Programmable Gate Array) device. The paper describes the Field Oriented Control (FOC) algorithm and the Space Vector Modulation (SVM) technique that were implemented. The control platform uses a Spartan-3E FPGA board, programmed with Verilog language. Simulation and experimental results are presented to validate the developed system operation under different load conditions. Finally are presented conclusions based on the experimental results.

A case study on the conversion of an internal combustion engine vehicle into an electric vehicle

This paper presents the conversion process of a traditional Internal Combustion Engine vehicle into an Electric Vehicle. The main constitutive elements of the Electric Vehicle are presented. The developed powertrain uses a three-phase inverter with Field Oriented Control and space vector modulation. The developed on-board batteries charging system can operate in Grid-to-Vehicle and Vehicle-to-Grid modes. The implemented prototypes were tested, and experimental results are presented. The assembly of these prototypes in the vehicle was made in accordance with the Portuguese legislation about vehicles conversion, and the main adopted solutions are presented.

Three-phase current-source shunt active power filter with solar photovoltaic grid interface

This paper presents the proposal of a three phase current source shunt active power filter (CS-SAPF) with photovoltaic grid interface. The proposed system combines the compensation of reactive power and harmonics with the injection of energy from a solar photovoltaic array into the electrical power grid. The proposed equipment presents the advantage of giving good use to the current source inverter, even when the solar photovoltaic array is not producing energy. The paper describes the control system of the CS SAPF, the energy injection control strategy, and the current harmonics and power factor compensation strategy. Simulation results to assess the performance of the proposed system are also presented.

O ambiente como argumento final na imprensa brasileira

O presente artigo analisa, no quadro da ecolinguística, uma notícia publicada num jornal brasileiro, acerca de um funcionário público proeminente detido pela polícia. Reconhece a centralidade da enunciação para a análise linguística e procura identificar a ideologia subjacente à modalização operada. Defende que o artigo analisado simplifica a realidade, cria dicotomias simplistas e, num certo sentido, manipula os factos para criar espetacularização e atrair o público. Em particular, evoca o interdiscurso ambiental que percorre a esfera pública para, por associação, valorizar a imagem do indivíduo-alvo e, em seguida, inverter a valorização e criar dele uma imagem fortemente disfórica. O interdiscurso ambiental é, então, dado como pacífico, aceite inquestionavelmente por todos os cidadãos, e a militância ambiental é apresentada como traço mais elevado do caráter do indivíduo em causa.. Apesar de se apresentar como uma notícia, com caraterística de texto objetivizado, o artigo em análise é claramente avaliativo e substitui os tribunais pela praça pública para a condenação do indivíduo-alvo, mesmo sem o ter ouvido e considerado a sua defesa.

Inversão do Contencioso: um contributo para o estudo deste regime no seio das providências cautelares

Dissertação de mestrado em Direito Judiciário: Direitos Processuais e Organização Judiciária

Structure dependent resistivity and dielectric characteristics of tantalum oxynitride thin films produced by magnetron sputtering

tThe main purpose of this work is to present and to interpret the change of electrical properties of TaxNyOzthin films, produced by DC reactive magnetron sputtering. Some parameters were varied during deposi-tion: the flow of the reactive gases mixture (N2and O2, with a constant concentration ratio of 17:3); thesubstrate voltage bias (grounded, −50 V or −100 V) and the substrate (glass, (1 0 0) Si or high speed steel).The obtained films exhibit significant differences. The variation of the deposition parameters inducesvariations of the composition, microstructure and morphology. These differences cause variation of theelectrical resistivity essentially correlated with the composition and structural changes. The gradualdecrease of the Ta concentration in the films induces amorphization and causes a raise of the resistivity.The dielectric characteristics of some of the high resistance TaxNyOzfilms were obtained in the sampleswith a capacitor-like design (deposited onto high speed steel, with gold pads deposited on the dielectricTaxNyOzfilms). Some of these films exhibited dielectric constant values higher than those reported forother tantalum based dielectric films.

Controlador com FPGA para um motor-in-wheel CA de fluxo axial

Dissertação de mestrado integrado em Engenharia Eletrónica Industrial e de Computadores

Desenvolvimento de um filtro ativo paralelo monofásico compacto e didático utilizando MOSFETs

Dissertação de mestrado integrado em Engenharia Eletrónica Industrial e Computadores

Desenvolvimento de um filtro ativo paralelo com CSI e controlo de corrente no barramento CC

Dissertação de mestrado integrado em Engenharia Eletrónica Industrial e Computadores

Эмпирическая связь между радиолокационной отражаемостью (Z) и интенсивностью атмосферных осадков (I) мультиячейковых конвективных облаков

დედამიწის მტკნარი წყლის ერთადერთ წყაროს ატმოსფერული ნალექები წარმოადგენს. კლიმატის გლობალური ცვლილების ნეგატიური შედეგების შესამცირებლად დიდი მნიშვნელობა ენიჭება რეალურ დროში დიდ ტერიტორიაზე ატმოსფერული ნალექების მონიტორინგს.

Angioplastia coronariana versus cirurgia de revascularização: revisão de estudos randomizados

Realizamos uma revisão com agregação de resultados dos ensaios randomizados que compararam intervenção coronariana percutânea (ICP) com cirurgia de revascularização miocárdica (CRM). Os 25 ensaios selecionados envolveram 12.305 pacientes dos quais 11.103 pertenciam a estudos em multiarteriais e 1.212 pertenciam a estudos em lesão única de descendente anterior (DA). Nos estudos em multiarteriais a ICP mostrou uma tendência a menor mortalidade precoce (1,2% versus 2%) e menor incidência de acidente vascular cerebral (AVC): 0,7% versus 1,65%. Não houve diferença na mortalidade intermediária (3,8% versus 3,8%). Houve tendência à superioridade da CRM na mortalidade tardia (10,5% versus 9,6%). A diferença deveu-se exclusivamente aos estudos da era balão, tendendo a inverter-se na era stent (9,6% versus 9,9%). Nos estudos de lesão única de DA não houve diferença significativa em nenhum desfecho. A agregação de resultados de nove estudos que avaliaram a mortalidade tardia em diabéticos mostrou diferença favorável à cirurgia (21,3% versus 15,9%). Dois estudos que avaliaram lesão de tronco não mostraram diferença significativa na mortalidade em um ano (3,9% versus 4,7%). A incidência de nova revascularização foi consistentemente maior na ICP, apesar de progressiva melhora dos resultados na era stent.

Hepatology - A Clinical Textbook, Fifth Edition

Hepatology is an ever - changing field. The editors and authors of Hepatology − A Clinical Textbook have made every effort to provide information that is accurate and complete as of thedate of publication. However, in view of the rapid changes occurring in medical science, as well as the possibility of human error, this book may contain technical inaccuracies, typographical or other errors. Readers are advised to check the product information currently provided by the manufacturer of each drug to be administered to verify the recommen ded dose, the method and duration of administration, and contraindications. It is the responsibility of the treating physician who relies on experience and knowledge about the patient to determine dosages and the best treatment for the patient. The informa tion contained herein is provided "as is" and without warranty of any kind. The editors and Flying Publisher & Kamps disclaim responsibility for any errors or omissions or for results obtained from the use of information contained herein.

Short Guide to Hepatitis C

Hepatitis C is a rapidly developing area of medicine – diagnostic tools are ever more refined, and entirely new treatments and treatment strategies are arriving, with more on the horizon. And because the virus affects such a large and varying population – up to 170 million at last count – we think it is important to have a pocket reference especially devoted to hepatitis C. We look forward to your comments on the usefulness of our 2014 Short Guide to Hepatitis C, which is an expansion and update of the HCV chapters in Hepatology – A Clinical Textbook (2014), also published by Flying Publisher. As always, we invite qualified people everywhere to translate this book into other languages, and make them available widely. This web-based free-of- harge concept is made possible by unrestricted educational grants from the pharmaceutical industry and has allowed the material to reach countries usually not covered by print media. We are convinced that this new pocket guide concept, focusing here on hepatitis C, will become a valuable source of information for our readers.

The Word Brain - A Short Guide to Fast Language Learning

How long does it take to learn another language? How many words do you need to learn? Are languages within the reach of everybody? Which teachers would you choose and which teachers should you avoid? These are some of the questions you ask yourself when you start learning a new language.The Word Brain provides the answers. If you have learned foreign languages in the past, consider reading it. If you or your children need to learn languages in the future, you must read it. What you will discover in two hours will change for ever the way you see languages and language learning. The principles of The Word Brain are timeless. Our children’s grandchildren will follow them when they discover the people of our planet.

Critical Care in in Neurology

Neurocritical care is an ever-changing field. The publishers and author of The Flying Publisher Guide to Critical Care in Neurology have made every effort to provide information that is accurate and complete as of the date of publication. However, in view of the rapid changes occurring in medical science, as well as the possibility of human error, this site may contain technical inaccuracies, typographical or other errors. It is the responsibility of the reading physician who must rely on experience and knowledge about the patient to determine the best treatment and care pathway. The information contained herein is provided “as is”, without warranty of any kind. The contributors to this book, including Flying Publisher & Kamps, disclaim responsibility for any errors or omissions or for results obtained from the use of information contained herein.