Previsão de demanda de cargas elétricas por seleção de variáveis stepwise e redes neurais artificiais

Pós-graduação em Engenharia Elétrica - FEIS

Efeito das cargas de treinamento sobre parâmetros fisiológicos de futebolistas

The aim of this study was to investigate the effects of three weeks of training with intensity monitored on the aerobic capacity of professional soccer players. Fourteen players, members of a first division Brazilian Championship team in 2010, aged 22.78 +/- 3.06 years were evaluated pre and post three weeks of training. The anaerobic threshold intensity LAn was determined by bi-segmented method, for this four submaximal efforts of 800 meters with intensities 10, 12, 14 and 16 km/h were applied. Thirty three training sessions were quantified in zones according to heart rate related to the LAn (FCLAn): Z1 - 10% below, Z2 - 90-100% and Z3 - above the FCLAn. During training participants remained 31.17 +/- 14.86%, 42.96% and 25.87 +/- 14.90 +/- 16.67% in Z1, Z2, and Z3 respectively. There were no significant differences in the LAn (pre = 13,29 +/- 0,71 km.h(-1); post = 12,85 +/- 0,90 km.h(-1)), perceived exertion (pre = 11,53 +/- 1,45 u.a; post = 11,23 +/- 1,53 u.a) and FCLAn (pre = 166,64 +/- 10,69 bpm; post = 174,50 +/- 10,89 bpm) between conditions before and after training, indicating that three weeks of training are insufficient to generate positive changes in soccer players LAn.

Estudo das características térmicas e mecânicas de formulações de adesivos PSA HOT MELT contendo variações de borrachas SBC e resinas taquificantes

The properties of the hot melt adhesive pressure sensitive (HMPSA) using an elastomer as a base polymer a copolymer of styrene and butadiene (SBS) and variation of tackifiers resins such as hydrocarbon resins and hydrogenated hydrocarbon were investigated. The formulations were prepared by mixing process within shear. The adhesives prepared were evaluated in test Brookfield viscosity and softening point Ring and Ball to compare the formulations and the influence of variations in raw materials. Infrared analyzes were performed to detect the reactions between the inputs and investigate the chemical interactions of the same properties of the adhesive. In thermal analysis, the assay was performed thermogravimetry (TG) and diferencial exploratory calorimetry (DSC). Were investigated the parameters of the tensile test on each of the formulations. Finally, were analysed comparatively the basic formulations of adhesives with their respective raw materials

Avaliação das tendências térmicas urbanas: o exemplo de Rio Claro-SP

O presente estudo teve o intuito de estudar o comportamento das temperaturas e investigar uma possível tendência de aumento térmico na cidade de Rio Claro – SP, a partir de dados obtidos junto ao Posto Meteorológico localizado nas dependências do CEAPLA (Unesp), no período de 1994 a 2006, levando em conta os meses de janeiro a março (verão) e junho a agosto (inverno), analisando suas temperaturas médias, máximas e mínimas através de técnicas de estatística descritiva, buscando entre parâmetros locais e globais as causas para a tendência encontrada e baseando-se nas concepções teóricas que explicam a constituição de um clima urbano e fundamentam as mudanças na temperatura do planeta

Projeto de um sistema de aquisição dedados para a planta termelétrica do laboratório de máquinas térmicas do DEN/FEG/UNESP

With the purpose of provide students with the practical contact with the operation of a thermoelectric plant, the steam plant Laboratory College of Engineering Guaratinguetá was restored, this work was undertaken so that the necessary equipment was specified for this steam plant had their instrumented processes, enabling greater precision of the measurements performed in the tests and also storing your information. The instrumentation of the plant is to approximate the practices carried out in the laboratory with real situations encountered in industrial steam plant, thus collaborating with the most comprehensive training of students and ensuring the safety of operations performed in the laboratory

Ampliação da capacidade da portaria de cargas de uma indústria através da implantação de um sistema de pesagem por eixo

Through a detailed study of each component, the structural part and various technologies for highway weighing scales, a project was developed in order to implement a modern system of axle weighing in a company pursuing to expand its cargo door capacity, which was restricted to weighing and inspection of the maximum load of each vehicle, and especially to extinguish the number of notifications that the company has been suffering, by having their transportation logistics vehicles caught traveling with poorly distributed load per axle, what it caused damage to roads and vehicles and denigrated the company image in terms of marketing. To achieve these results, the project went through a study of all relevant national legislation, seeking to put the company always in agreement. Moreover, it had investments and its physical space available for its implementation. The payback of such investments would be about less than three years

Influência da aplicação de cargas estáticas axias e não axais em próteses parciais fixas de três elementos, análise pela extensometria

Um bloco de poliuretano recebeu três implantes de hexagono externo, no posicionamento compensado. Para cada implante foi conectado o pilar protético microunit. Foram realizados cinco enceramentos com três coifas plásticas cada um, que foram fundidos em monobloco numa liga de cobalto-cromo. Foram colados quatro extensomêtros tangenciando cada implante, sendo dois extensomêtros para o implante central. Após o acabamento, as estruturas foram fixadas nos respectivos locais com o parafuso de retenção com torque de 10 Ncm, obtidos com um torquímetro. Para aplicação de carga sobre os corpos-de-prova foram selecionados cinco pontos de aplicação de carga. O dispositivo de aplicação de carga–DAC foi utilizado 30 kg de cargas verticais estáticas, empregando uma ponta esférica de 2 mm de diamêtro, durante 10 segundos em cada um dos pontos estabelecidos, sendo, neste instante registradas as micro deformações de cada extensômetro. Foi utilizado o teste de análise de variância T Student e o nível de significância foi o valor convencional de 5%. Para cada implante foi analisada a microdeformação ocorrida. Os resultados obtidos mostraram que houve uma diferença estatisticamente significativa entre os pontos não-axiais D e E (t = 5,21 df = 4, p = 0,006 < 0,05) e não foi estatisticamente significativa para os dados axial entre os pontos B e C (t = 6, 57, df = 4, p = 0,003 < 0,05 / 3). Conclui-se que,a aplicação de carga ao redor de três implantes de hexágono externo no posicionamento compensado,mostra que os pontos não-axiais sofrem maior micro deformação do que os pontos axiais

Melhorias dos processos no setor de expedição em uma transportadora de cargas fracionadas

The transport market has forced organizations reduce the cost of services and processes, resulting from the highly competitive and, for such waste at all levels and processes are a focus of study for its elimination. This study refers to carrier fractional loads, located in the municipality of Itapecerica da Serra Layout and headquartered in São Paulo, which requires a rapid development throughout its structure, because its expansion was not accompanied by an evolution of effective processes. The need to increase efficiency in delivery with a reduced cost of transport forced the company to hire a logistics consulting to help identify potential bottlenecks in processes, suggest improvements with greater impact and implementation at the end of a critical analysis of results. This work focuses on the Layout of the warehouse shipping area of this organization and we used the method of action research to the consultant and involved could reach this conclusion collaboratively, as well as interviews with those involved in the process and also visual observation. Tools such as Key Performance Indicator, Mapping Workflow, Analytic Hierarchy Process, Applied Statistics and Standard Operating Procedure were used to assist in the identification, analysis and implementation of the proposed improvements

Geração de energia fotovoltaica para cargas pontuais em residências

This work, based in a patent request at INPI, protocol no. 020110035974, presents a system development using solar panels to supply the electricity demand required by punctual loads, without a storage unit or utility grid synchronism, through a control circuit that allows parallel operation with the power grid during low sunlight incidence periods. A study about solar panel construction and topologies for Power generation was done, in a atempt to evalute impacts in project. This development was modular, providing the system the possibility of power capacity expansion and load diversity as well, in an attempt to reduce the total energy requirements from the residential sector drained from the power grid along the day

Análise de sistemas de máquinas térmicas em plantas de processos químicos

Pressure drop and energy efficiency of compressors in chemical plants are the focus of this study. Its objective is an analysis of possible sources of energy loss through the study of pressure loss in pipes, calculation of thermodynamic efficiency of the compressors. Important issues are raised for this analysis such as the types of compressors, the operating range of each compressor, compression types, as well as a study of accessories such as filters and valves. After studying these issues was carried out calculations of pressure drop step-bystep and with a software WIPCD. Followed by the calculation of efficiency of compressors and monthly energy cost of each compressor in operation. Finally, the study shows some suggestions for immediate improvements, changes and suggestions for possible future purchases of compressors

Revestimento interno de tubulação por um processo de centrifugação utilizando resina éster-vinílica com adição de cargas

Being the corrosion one of the great problems facing the industry today, specifically the internal corrosion of pipes in chemical and petrochemical industries, hence this work proposes a new type of internal coating in order to avoid fouling and decrease the pressure loss in the flow. For this, we use a composition of vinyl ester resins and manometric loads, which after cleaning and preparation of the internal surface of the tube will be applied through a process of centrifugation, adjusted by a lathe. After curing the resin, a test of roughness will be realized in order to analyze the reduction of friction factor and thus be able to conclude whether there was a significant decrease in pressure drop. With test results in hand, we hope to obtain a coating that meets most of the properties required by the industry and to provide a reduction in operating costs and a visible improvement in the conditions of use of the pipe

Estudos exploratórios sobre propriedades térmicas do compósito cimento-polpa celulósica(CPC)

The search for a more aware use of available raw materials has led to a need to create more sustainable products. The use of natural fibers to reinforce cement, for instance, has been widely studied in the past decades because of the possibility that they can improve material properties such as thermal resistance and to compression, besides conferring a decrease in their total weight. This present study aimed at to conduct preliminary studies on the thermal resistance of the composite cement - Cellulose Pulp, using waste from the pulp and paper industry. Through experiments, it was found that the composite manufactured using the ratio 30 % Portland cement and 70 % pulp, showed satisfactory results regarding its thermal resistance, so it could be considered as a potential thermal insulation material, for use in constructions

Chaveamento de cargas intermitentes usando sensor de corrente

Due to concerns about rational use of energy, several alternative technologies of power generation appeared, including the conversion of solar energy into electrical energy by photovoltaic panels. In low-income households, the refrigerator represents considerable impact on the electric bill, since it requires constant power given its use in food preservation. It is possible to reduce this share, with the use of an alternative energy source. This work presents a timed switching electronic system, which allows commercial equipment that is not affected by short interruptions in the power supply to use a photovoltaic panel as a source of alternative energy, which usually do not provide energy continuously. Switching is made automatically in case of low incidence of sunlight, and without any form of energy storage. Between each switching, there is a dead time without power supply, therefore preventing the use of synchronizers circuits between the photovoltaic panel and the public power grid. A circuit containing a 80C31 microcontroller is used to control the system’s switching. The photovoltaic panel’s voltage inverter is in H bridge configuration, and is also controlled by the microcontroller through Pulse Width Modulation, which makes use of preprogrammed tables to generate the control signals of the power transistors. Through the use of software simulations, the proposed system was tested, which is capable of supplying intermittent single-phase loads. The simulations indicates that the project developed in this paper can be assembled into a prototype and be tested under real operating conditions, as long as the scaling of components, the characteristics of the photovoltaic panel to be used, and the project involved load are taken into account

Análise das microdeformações geradas ao redor de implantes de hexágono externo sob a aplicação de cargas verticais em pilares microunit retos e angulados

Pós-graduação em Odontologia Restauradora - ICT

Fadiga em compósitos 5HS carbono/epóxi processados via RTM: relação entre cargas axiais no plano e modos de delaminação

Pós-graduação em Engenharia Mecânica - FEG