Optical and electrical diagnostics of a spark-plug discharge in air

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Conduzir o banquete da vida: a presença feminina na obra de Muriel Spark

Pós-graduação em Letras - FCLAS

Sparkianas texto adentro: narrativa e relações humanas nos contos de Muriel Spark (1918-2006)

Pós-graduação em Letras - FCLAS

Sparkianas texto adentro: narrativa e relações de gênero nos contos de Muriel Spark (1918-2006)

O objetivo da autora aqui é discutir como se dá, no trabalho da romancista e contista escocesa Muriel Spark (1918-2006), a constituição das personagens femininas e a forma como estas veem a si mesmas e aos outros. A análise tem como base a coletânea composta de 41 contos publicada em 2001 sob o título de All the Stories of Muriel Spark (inédita no Brasil), cujas narrativas, em sua maioria, já haviam sido publicadas anteriormente em outras coletâneas ou em outros meios, como jornais e revistas. A autora também estuda nos contos o modo como os textos da escritora revelam sua visão peculiar do mundo e dos indivíduos, que foi se tornando mais amarga, embora mais compreensiva, com o passar do tempo. As narrativas curtas sparkianas se distinguem por refletir os diferentes contextos históricos vividos pela escritora: há contos que têm como ambiente a África, onde ela viveu nos anos 1930 e 1940, outros que se passam na Europa do pós-guerra e ainda os contos escritos mais recentemente. De passagem, a pesquisadora também analisa o engajamento político e ideológico de Muriel Spark, cuja vida conflituosa não a impediu de alcançar considerável sucesso de crítica e público nos países de língua inglesa. Sua obra-prima, o romance Primavera de Miss Jean Brodie (1961), foi adaptada para o cinema - o filme foi exibido no Brasil sob o título Primavera de uma Solteirona

Thermodynamic analysis and comparison of downdraft gasifiers integrated with gas turbine, spark and compression ignition engines for distributed power generation

The objective of the present article is to assess and compare the performance of electricity generation systems integrated with downdraft biomass gasifiers for distributed power generation. A model for estimating the electric power generation of internal combustion engines and gas turbines powered by syngas was developed. First, the model determines the syngas composition and the lower heating value; and second, these data are used to evaluate power generation in Otto, Diesel, and Brayton cycles. Four synthesis gas compositions were tested for gasification with: air; pure oxygen; 60% oxygen with 40% steam; and 60% air with 40% steam. The results show a maximum power ratio of 0.567 kWh/Nm(3) for the gas turbine system, 0.647 kWh/Nm(3) for the compression ignition engine, and 0.775 kWh/Nm(3) for the spark-ignition engine while running on synthesis gas which was produced using pure oxygen as gasification agent. When these three systems run on synthesis gas produced using atmospheric air as gasification agent, the maximum power ratios were 0.274 kWh/Nm(3) for the gas turbine system, 0.302 kWh/Nm(3) for CIE, and 0.282 kWh/Nm(3) for SIE. The relationship between power output and synthesis gas flow variations is presented as is the dependence of efficiency on compression ratios. Since the maximum attainable power ratio of CIE is higher than that of SIE for gasification with air, more research should be performed on utilization of synthesis gas in CIE. (C) 2014 Elsevier Ltd. All rights reserved.

Atmospheric particulate polycyclic aromatic hydrocarbons from road transport in southeast Brazil

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Flammability limits: A review with emphasis on ethanol for aeronautical applications and description of the experimental procedure

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Study of utilization of petrol engine equipped with exhaust gas recirculation (EGR) and catalytic converter to reduce consumption and NOx emission

Study of consumption rate and gaseous pollutant emission from engine tests simulating real work conditions, using spark point manually controlled and exhaust gas recirculation (EGR) in diverse proportion levels. The objective of this work is to re-examine the potential of the EGR conception, a well-known method of combustion control, employed together electronic fuel injection and three-way catalytic converter closed-loop control at a spark ignition engine, verifying the performance characteristics and technical availability of this conception to improve pollution control, fuel economy at low torque drive condition and to improve the engine exhaust components useful life. The pollutant emissions and consumption levels under operational conditions simulations were analysed and compared with the expected by concerning theory and real tests performed by EGR equipped engines by factory. Copyright © 2006 Society of Automotive Engineers, Inc.

Retificação da alumina com rebolo diamantado usando diferentes métodos de lubri-refrigeração

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

“Fagulhas”: uma coluna de crônicas de Coelho Neto na Gazeta de Notícias (1897-1899)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise da influência do tempo de centelhamento para diferentes métodos de refrigeração na retificação

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desgaste de dressadores de ponta única fabricados com diamantes cvd nacionais

This study attempted to observe the performance of three types of diamonds, two natural and one synthetic, to determine which features longer life and greater wear than the others. The methodology employed in this study was to dressed an aluminum oxide grinding wheel, and every twenty paces with a advance of depth dressing of 40 µm per passes, take an image of the tip in a horizontal position and the other in the vertical position of this diamond in a stereoscopic. Thereafter, the dresser was replaced in the rectifier to conduct a new dressing. The criteria to completion of the test was the spark generated by the grinding wheel contact with the base of the dresser, which indicates the end of the contact with the diamond wheel. After the tests, was calculated the areas worn of each diamond in accordance with each image obtained through the aid of a graphics software. The data were then arranged in graphs.

Otimização ecológica dos ciclos ar-padrão Otto e Diesel

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo e modelagem 3D de um cabeçote para um motor monocilíndrico, 400cc, 4 T

The cylinder head contains the combustion chamber for the air-fuel mixture and the intake and exhaust valves, the valve guide and the valve seat. The cylinder head also is a support for the camshaft and valve rocker. The holes where the spark plugs are connected are designed to fit the better place in the combustion chamber. The cylinder heads often are manufactured using materials such as aluminum and cast iron. The cooling fins located in the outside of the cylinder head are designed for a good heat transfer and therefore their dimensions and positioning are important. This work aims the calculation for a cylinder head to be installed in a 400 cc displacement, gasoline powered, four stroke, single cylinder engine. According to the displacement it will be analyzed the combustion chamber, the intake and exhaust valves, as well as the camshaft and rocker arms. This also a work to help to accomplish the design of a single cylinder engine, where the alternatives parts, cylinder block and crankcase are all already machined and assembled in this campus

Engine LES with fuel-spray modeling

Pós-graduação em Engenharia Mecânica - FEG