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Search Results: 1 - 10 of 20642 matches for " Giovani Marcelo Teixeira "
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Fractional control of an industrial furnace = Controle fracionário de um forno industrial
Luis Antonio Duarte Isfer,Ervin Kaminski Lenzi,Giovani Marcelo Teixeira,Marcelo Kaminski Lenzi
Acta Scientiarum : Technology , 2010,
Abstract: The requirements of high production allied with product quality, process safety and environmental regulation, lead control systems to play a key role in the operation of chemical and biochemical plants. In petrochemical plants, furnaces are essential equipments for process operation and due to energy costs, adequate operation and control are of extreme importance for process economics. The search for new and more efficient control laws led to the development of fractional PID control algorithm, which is based on the use of fractional differential equations. In this work, a previously identified mathematical model of an actual industrial furnace is used for fractional PID control studies. Feedback loop in servo control was analyzed, focusing on the study of the influence of the controller parameters over control loop performance. Particularly, P, fractional PI and fractional PD controller were considered in this study. Simulations were carried out showing that the fractional controllers were able to perform set-point transitions. The control loop performance was evaluated by ITAE and ISE criteria, showing that, in this study, fractional PI is the best algorithm. A necessidade da elevada produtividade aliada à qualidade dos produtos, seguran a dos processos e a legisla es ambientais levaram sistemas de controle a possuírem papel fundamental na opera o deplantas químicas e petroquímicas. Em plantas petroquímicas, fornos s o equipamentos fundamentais para a opera o do processo e, pelo custo da energia, a opera o e o controle adequados s o de essencial importancia para a economia do processo. A procura de novas e mais eficientes leis de controle levou ao desenvolvimento do algoritmo de controle PID fracionário, o qual é baseado no uso de equa es diferenciais de ordem fracionária. Neste trabalho, um modelo matemático previamente identificado para um forno real é utilizadopara estudos de controle fracionário. Foi analisado o problema de controle servo em malha retroalimentada (feedback), focando o estudo da influência dos parametros do controlador sobre o comportamento da malha de controle. Especificamente, controladores tipo P, PI fracionário e PD fracionário foram considerados neste estudo. Simula es foram realizadas mostrando que controladores foram capazes de fazer a transi o de setpoint. O desempenho das malhas de controle foi avaliado com os critérios ITAE e ISE, mostrando que, neste estudo, o controlador PI fracionário foi o melhor algoritmo.
Os efeitos dos choques reais e nominais sobre as taxas de cambio no Brasil
Marinho, Emerson;Teixeira, Marcelo;
Estudos Econ?micos (S?o Paulo) , 2010, DOI: 10.1590/S0101-41612010000300002
Abstract: this article analyses the impact of real and nominal shocks on the real and nominal exchange rates between brazil and the us in the period from1999 to 2007. the main objective is to verify the real and nominal exchange rates paths toward the long-run equilibrium, and how these rates can be decomposed into movements caused by real and nominal shocks. the results show that both types of exchange rates respond immediately to a nominal shock leading to overshooting. however, the effect of a nominal shock, on the real exchange rate is only temporary, while, on the nominal exchange rate, it is permanent. subjected to a real shock both exchange rates jump to a level that overshoots their long run equilibrium, returning to it around 25 months. the real shock also has a permanent effect on the real and the nominal exchange rates.
A educa??o científica sob a perspectiva da pedagogia histórico-crítica e do movimento C.T.S. no ensino de ciências
Teixeira, Paulo Marcelo M.;
Ciência & Educa??o (Bauru) , 2003, DOI: 10.1590/S1516-73132003000200003
Abstract: the article tries to discuss how historico-critical pedagogy and the sts movement in science education can contribute to the change of scientific education that we have at the present time. we visualize points of convergence between these two theoretical currents, with interesting implications in respect to the formation of teachers. finally, we will claim that these two theories can place science education in a differentiated perspective, which can contribute to the formation of citizenship and the transformation of society through popular interests.
Arbitragem: suas possibilidades sociais
Marcelo Tolomei Teixeira
Sequência : Estudos Juridicos e Politicos , 1999,
Abstract:
Financiamento da saúde pública no Brasil: a experiência do Siops
Teixeira,Hugo Vocurca; Teixeira,Marcelo Gouvêa;
Ciência & Saúde Coletiva , 2003, DOI: 10.1590/S1413-81232003000200005
Abstract: this article presents information about public budgets for a health system, called siops, and it's basic features. it briefly comments a siops's strategy of collect data, and it exemplifies some of it's potential as an instrument for helping health management. siops focuses on information about the financing and expenses of public health in municipalities, states and in the union, being therefore a unique data bank in the social policy field in brazil. the data bank is growing on a steady basis and is as well improving in terms of information reliability. it produces information increasing in regularity and quality. the siops is presented as an important data source for researches of health policies, as an instrument for control agencies to exert the attendance and fiscal inspection, and as an instrument for managing and evaluating the actions for the unified health system (sus). the infomation retrieved by siops will eventually further develop management, spread the well-succeeded experiences among the states, and balance the distribution of expenses between investments and costs, as well as the distribution of resources among government levels.
Financiamento da saúde pública no Brasil: a experiência do Siops
Teixeira Hugo Vocurca,Teixeira Marcelo Gouvêa
Ciência & Saúde Coletiva , 2003,
Abstract: Este artigo apresenta características do Sistema de Informa es sobre Or amentos Públicos de Saúde (Siops), tece breves comentários sobre a estratégia de coleta e os dados coletados, e exemplifica algumas de suas potencialidades como instrumento de apoio à gest o. O Siops reúne informa es sobre o financiamento e o gasto com saúde pública dos municípios, dos estados e da Uni o, constituindo-se em banco de dados único no ambito das políticas sociais no Brasil. Produzindo informa es com regularidade e com qualidade crescente, o sistema conforma-se como uma importante fonte de dados para a realiza o de estudos pelas institui es de pesquisa, para o exercício do acompanhamento e fiscaliza o pelos órg os de controle e para a gest o e avalia o das a es no ambito do Sistema único de Saúde. Tais informa es podem viabilizar o aprimoramento da gest o, a dissemina o de experiências bem-sucedidas entre os entes federados, e a adequada distribui o dos gastos entre investimento e custeio e entre as esferas governamentais, tendo em vista o dimensionamento das redes de aten o, dentre outras quest es.
Libera??o do canal do carpo por mini-incis?o transversa
Alves, Marcelo de Pinho Teixeira;
Acta Ortopédica Brasileira , 2011, DOI: 10.1590/S1413-78522011000600008
Abstract: objective: to compare two incisions used for the surgical treatment of cts: the classic longitudinal incision, over the transverse carpal ligament (tcl), and the mini-incision, at the wrist crease and near the proximal border of the tcl. methods: 47 patients from the hand surgery outpatient clinic of the clínwica traumato - ortopédica madureira are evaluated. group 1 consisted of 24 patients (28 hands) treated by the classic incision. group 2 consisted of 23 patients (28 hands), treated by the transverse mini-incision technique. both groups were compared in relation to discomfort of the scar, presence or absence of "pillar" pain, and time elapsed before returning to daily activities or unrestricted work. results: there was prevalence of females (87.5% in group 1; 91.3% in group 2) and of electromyographic bilateral syndrome in both groups (75% patients of group 1; 86% patients of group 2). scar discomfort and "pillar" pain were more frequent in group 1, but there was no difference in the time elapsed before returning to work or daily activities between the groups. conclusion: the mini-incision technique is a less invasive alternative, and enables complete release of the carpal tunnel, with less morbidity than classic longitudinal incision. level of evidence ii, therapeutic.
Excis?o de tumor de células gigantes de bainha de tend?o com envolvimento ósseo por dupla via de acesso: relato de caso
Alves, Marcelo de Pinho Teixeira;
Revista Brasileira de Ortopedia , 2011, DOI: 10.1590/S0102-36162011000100020
Abstract: giant cell tumors of the tendon sheath are common lesions and are the second most frequent tumors in the hand, after synovial cysts. they are diagnosed by means of clinical examination and complementary examinations (simple radiography and magnetic resonance). erosion and invasion of the phalangeal bone affected may be seen on radiological examination. magnetic resonance may show a "fluorescent or radiant effect" may be observed, caused by the high quantity of hemosiderin inside the tumor. surgical treatment is the commonest practice, and complete excision is important for avoiding recurrence of the tumor, especially when bone invasion is observed on imaging examinations, which is generally related to greater tumor recurrence. in this paper, a case of a giant cell tumor of the tendon sheath in the middle phalanx of the third finger of a 45-year-old female patient is presented. this was successfully treated by means of surgery using a double access route (dorsal and volar).
Estudo prospectivo comparativo entre a descompress?o do canal do carpo pela mini-incis?o transversa proximal e a incis?o palmar longitudinal convencional
Alves, Marcelo de Pinho Teixeira;
Revista Brasileira de Ortopedia , 2010, DOI: 10.1590/S0102-36162010000500011
Abstract: carpal tunnel syndrome (cts) is the most common compressive neuropathy, a pathology frequently seen in orthopedic clinics and the neuropathy most often treated surgically. the diagnosis of cts is made clinically, through a clinial history, physical examination (tinel, phalen, and durkan tests) and complementary exams, and more specifically nerve conduction studies. eventually, ultrasound scans and magnetic resonance imaging may be used. conservative treatment is reserved for patients presenting with light symptoms, mild impairment and showing a good response to non-steroidal or steroidal anti-inflammatory drugs, physical therapy, and lifestyle changes. surgical treatment is the most frequent, employing various techniques. the goal of the surgery is to decompress the carpal tunnel, and by sectioning the transverse carpal ligament, releasing the median nerve. this paper's objective is to compare the surgical treatment of cts by means of two incisions: the first is the classic longitudinal incision over the transverse carpal ligament, and the second is a mini-incision at the wrist crease and near the proximal border of the ligament. the mini-incision technique is a less invasive and equally effective technique for the treatment of cts, with less morbidity when compared to the classic longitudinal incision.
A percep o da paisagem para a organiza o territorial do turismo
Marcelo Teixeira Cesar de Oliveira
Revista Brasileira de Ecoturismo , 2009,
Abstract:
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