160 resultados para controle por realimentação dinâmica de saída
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Agronomia (Produção Vegetal) - FCAV
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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O presente trabalho envolveu três experimentos: Influência da imunização passiva contra estradiol (E2) e a aspiração do maior folículo (F1) no momento do desvio folicular esperado, sobre a ocorrência do desvio folicular observado. Também foi objetivo verificar o efeito desses tratamentos sobre o perfil de hormônio folículo estimulante (FSH), hormônio luteinizante (LH) e inibina total circulante. Para tanto, os animais foram imunizados com dose única de soro anti-E2 (G anti-E2) ou o F1 foi aspirado no momento do desvio esperado (GAF1). O plasma sangüíneo foi obtido no período pré e póstratamento. O intervalo entre o dia da aplicação do soro (desvio esperado) e o dia da detecção do desvio foi em média o mesmo para o G anti-E2 e controle. No GAF1, a eliminação do maior folículo provocou atraso no momento da detecção do desvio folicular entre o segundo (F2) e o terceiro (F3) maior folículo, comparado ao controle. Em ambos os tratamentos o perfil de FSH, LH e inibina total foi similar ao controle. O experimento 2 tratou de um projeto piloto visando dominar a técnica de colheita de fluido dos grandes folículos ovarianos por meio de punção com agulha fina e o efeito desse procedimento sobre o folículo e às concentrações hormonais. Foram utilizados dois grupos de animais, G1 o folículo foi mantido intacto (controle) e G2 foi utilizada uma punção folicular quando o maior folículo atingiu diâmetro ~35 mm. Ultrasonografia ovariana foi realizada desde o ínicio da detecção de um folículo ~25mm, seguindo até a detecção da ovulação. O terceiro experimento objetivou verificar a influência de gonadotrofina coriônica humana (hCG) em folículos de 30 ou 35mm sobre as concentrações de hormônios esteróides e fatores intrafoliculares. A colheita do fluido folicular foi realizada imediatamente antes e 30 horas após a aplicação... (Resumo completo, clicar acesso eletrônico abaixo)
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The human hand is the focus of inumerous research studies. Human individuals are capable of performing manual tasks beyond the ability of any other animal. Such large motor ability is due in part to contact surface of the pulp thumb in opposition to the other fingers. Evidences in the literature show that the position of the upper limb influences the ability of hand strength and control. Specifically, the position of the wrist has great influence on the production of pinch strength. The main objective of this study was to investigate the influence of wrist position on the pinch grip with the thumb in opposition to the index finger. Participants of the present study were 21 undergraduate students, 10 men and 11 women. Participants performed a pinch grip task in three wrist positions - maximum flexion, maximum extension and neutral - on two force conditions - 20% and 40% of maximum voluntary contraction (MVC). MVC was measured in two attempts in each of the three positions of the wrist for a period of three seconds, and the trial of the best result was used as the parameter for task performance. In each trial participants maintained the force production at position for 10 seconds. All participants performed each test condition four times, and the first was used as a familiarization trial and discarded from further analysis. In all trials visual feedback online was provided. Results of both group gender showed variability was similar for force production. Men were stronger than women, but this difference was not significant and both produced on the average more strength in the neutral wrist position than in flexion or extension. In the extended position participants were significantly less variable than in the flexion and neutral positions. We obtained a significant positive correlation between weight and pinch force...(Complete abstracts click electronic access below)
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In this work we investigate the dissociation of heteronuclear diatomic molecules subjected to laser pulses. This phenomenon can be modeled by the classical forced Morse oscillator. This system presents a chaotic dynamics associated with the anharmonicity of the internuclear potential and with the coupling of permanent dipole of molecule with the electric field of laser. We want to verify how the dissociation probability evolves while we change the intensity and frequency of laser. We study the phase space of molecules to have a better understanding of system dynamics. We make the calculations changing two parameters of laser (intensity and frequency) and checking how this parameters influences on molecule dissociation. We compare the results of HF molecule (Fluoride acid) and CO molecule (Carbon monoxide) to check how the dipole moment of each molecule can influence on laser interaction
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The present work develops a model to simulate the dynamics of a quadcopter being controlled by a PD fuzzy controller. Initially is presented a brief history of quadcopters an introduction to fuzzy logic and fuzzy control systems. Afterwards is presented an overview of the quadcopter dynamics and the mathematical modelling development applying Newton-Euler method. Then the modelling are implemented in a Simulink model in addition to a PD fuzzy controller. A prototype proposition is made, by describing each necessary component to build up a quadcopter. In the end the results from the simulators are discussed and compared due to the discrepancy between the model using ideal sensor and the model using non-ideal sensors
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Dengue virus is a major public health problem worldwide. Aedes (Stegomyia) aegypti is the main dengue vector. Since there is no specific treatment or effective vaccine, control measure is focused on vector control. It is believed that population density is higher in the warmer/rainy season than in cold/dry. The study aimed to genetically characterize population dynamics of Ae. aegypti during climatic variations. Collections were performed at least once in both periods over five years by oviposition traps at Botucatu city. The technique of TaqMan allelic discrimination was used for genetic analysis, in which SNPs from nine genes distributed on three chromosomes of the mosquito were genotyped. Bayesian analysis did not show variance on population structure over the five year period. The percentage of variation among samples in statistical analysis was low (Fst = 0.0028, p = 0.7634), furthermore the allele frequencies were constant. The results show that despite wide variation in the density of adults, population size does not vary. Therefore, there is variation in the prevalence of the species life stages: adults in warmer/rainy, and possibly eggs in cold/dry, resulting in different control strategies for each period. Moreover, estimation of population size should not consider only winged adults, but all other found life stages forms
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A regulação da temperatura corpórea, diante de variações da temperatura ambiente e/ou da taxa de produção de calor metabólico, envolve mecanismos reguladores da taxa de troca de calor entre o animal e o ambiente. Um destes mecanismos consiste na modulação da temperatura superficial de áreas especificas do corpo do animal, via ajustes vasomotores, que podem atuar tanto no sentido de promover a dissipação de calor (em uma situação de aumento da temperatura) quanto na retenção deste (em uma situação de queda de temperatura). Neste contexto, alguns animais exibem partes do corpo, como orelhas, membros, cauda, etc. que funcionam de maneira otimizada para realizar esta troca de calor. Nestes casos, estas partes são referidas como “janelas térmicas” e possuem em comum três características básicas: 1 - alta área superficial; 2 - baixo isolamento térmico; 3 – boa vascularização e controle do fluxo sanguineo na dependência da temperatura. Recentemente, o uso do bico como uma janela térmica foi descrito para o tucano-toco, Ramphastos toco (Aves, Ramphastidae), revelando ser esta uma estrutura com a maior capacidade de troca térmica já identificada. Naquele estudo, porém, a temperatura superficial das aves (bico) foi monitorada enquanto elas eram submetidas a mudanças bastante lentas (ao longo de várias horas) da temperatura ambiente, de forma que a dinâmica temporal da resposta exibida pelas aves permanecia ainda bastante desconhecida. Além disso, sabe-se que os membros das aves também atuam como importantes vias para troca de calor com o ambiente, e no caso do tucano toco, a regulação da temperatura superficial desses apêndices frente a variações da temperatura não tinha sido estudada. Portanto, o objetivo do presente estudo foi investigar a velocidade com que os ajustes vasomotores subjacentes à modulação... (Resumo completo, clicar acesso eletrônico abaixo)
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This work aims to make the closed loop control of a three phase induction motor, through the integration of the following equipment: a frequency inverter, the actuator system; a programmable logic controller (PLC), the controller; an encoder, the velocity sensor, used as a feedback monitoring the control variable and the three-phase induction motor, the plant to be controlled. The control is performed using a Proportional - Integrative - Derivative (PID) approach. The PLC has a help instruction, which performs the auto adjustment of the controller, that instruction is used and confronted with other adjustment methods. There are several types of methods adjustments to the PID controllers, where the empirical methods are addressed in this work. The system is deployed at the Interface and Electro Electronic Control laboratory in the Universidade Estadual Paulista Júlio Mesquita Filho, Guaratinguetá, São Paulo, then, in the future, this work becomes an experiment to be conducted in the classroom, allowing undergraduate students to develop a greater affinity to the programs used by the PLC as well as studies of undergraduate and graduate works with the help of assembly made
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The Cerrado is home to important biodiversity areas in the state of Sao Paulo. Therefore, research on the reproduction of species of this biome are essential to help conservation programs. Pollination is the main mechanism by which outcrossing plants perpetuate their populations, and the attractive, such as nectar, are of vital importance to many anthophilous animals and essential to the maintenance of interactions with pollinators. In this context, the objective of this study was to investigate the ecological dynamics of secretion and sugar composition of floral nectar in Zeyheria montana, an ornithophilous exclusive Cerrado species, visited preferentially by Colibri serrirostris, also exclusive to this biome. This dynamic was assessed in isolated flowers in pre-anthesis, using microsyringes to collect nectar and manual refractometer to measure the concentration. Experiments were carried out to evaluate production throughout anthesis, including the assessment of total daily production, the effect of successive removal, the rate of production during the day and night and changes in concentration and composition of sugars, which was performed in HPLC (High Performance Liquid Chromatography). The rate of nectar production was about three times greater at night with a concentration two times lower, resulting in a supply of large amounts of dilute nectar in the early morning hours, peak of visitation for hummingbirds. Moreover, the production of nectar was more pronounced before the anthesis, and is available to visitors already in newly opened flowers, which are preferentially visited by C. serrirostris. There was an increase in the nectar production of flowers in the group with successive manual removal upon the control group, suggesting that the withdrawal by visitors stimulates the production, ensuring the availability of the resource including flowers previously visited... (Complete abstract click electronic access below)
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We investigate the formation of molecules under the action of external field acting during the atomic collision. To describe this process, the collision of atomic pairs, we use the Morse oscillator model driven The study was developed from the standpoint of classical mechanics by analyzing the sensitivity of the system with respect to initial conditions, the verification of chaotic dynamics associated with the process of formation of molecules with laser and analysis of system dynamics and the likelihood of photoassociation in response to the external field parameters
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A rápida expansão do espaço urbano no Brasil ocorreu e continua ocorrendo, geralmente, de forma desordenada e sem perspectivas imediatas de ordenação das práticas de uso e ocupação do solo. O planejamento da ocupação do espaço urbano, baseado na racionalidade capitalista, embora englobe fundamentos interdisciplinares, na prática tem sido realizado dentro de um âmbito mais restrito do conhecimento, desconsiderando aspectos fundamentais dessa dinâmica. Essa situação tem resultado em grandes transtorno e custos para a sociedade e para o meio ambiente, atingindo diretamente os sistemas de drenagens urbanos e resultando no crescimento dos eventos de cheia. Assim, o planejamento urbano vem buscando alternativas que possibilitem o alcance do desenvolvimento urbano sustentável. Neste sentido, este trabalho objetiva avaliar qualitativamente a implantação reservatórios de detenção implantados no alto curso da sub-bacia do Alto Tietê, de modo a avaliar os problemas apresentados através da realização de um inventário dos avanços atingidos na incorporação destas medidas no gerenciamento dos sistemas de drenagem nesta subbacia.
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Pós-graduação em Engenharia Mecânica - FEB