Thermal Losses
Mostrando 13-24 de 66 artigos, teses e dissertações.
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13. Estudo das perdas térmicas de panelas entre o vazamento no forno elétrico à arco e o transporte para o forno-panela
A busca de melhoria de produtos siderúrgicos leva uma atenção especial para a área de aciarias. A introdução da metalurgia da panela, e portanto no refino secundário, contribuiu fundamentalmente para o aumento da qualidade do aço produzido. Um dos efeitos foi o aumento do tempo de residência do aço na panela, o que obrigou a utilização de materia
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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14. APROVEITAMENTO DE FONTES ALTERNATIVAS PARA REDUÇÃO DO CONSUMO DE ENERGIA ELÉTRICA E REFLEXOS NOS SEUS CUSTOS / UTILIZATION OF ALTERNATIVE SOURCES FOR REDUCING POWER CONSUMPTION AND ITS CONSEQUENCES IN COSTS
Residential consumption accounts for around one third of total energy consumed in Brazil. The electric shower is the main component of this consumption, along with air conditioning. Hence, much research has been conducted in order to reduce the consumption of this sector and the use of alternative energy sources. Among these include mainly solar and geotherm
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/09/2011
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15. Desacidificação por via física de óleo de palma : efeito da composição do óleo, das perdas de compostos nutracêuticos e cinéticas de degradação / Physical deacidification of palm oil : effect of oil composition, losses of nutraceutical compounds and reaction kinetics
Os parâmetros ótimos de desodorização (temperatura, porcentagem de vapor e pressão de operação) são determinados de acordo com o tipo de óleo e o processo de refino selecionado. O refino do óleo de palma é realizado preferencialmente através do refino físico, pois sua elevada acidez pode provocar uma perda excessiva de óleo neutro no caso da ut
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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16. DESEMPENHO EM DINAMÔMETRO E EMISSÕES RESIDUAIS DE UM MOTOR DE TRATOR AGRÍCOLA OPERANDO COM MISTURAS BINÁRIAS DE ÓLEO DIESEL B5 E BIODIESEL DE ÓLEO DE FRANGO / PERFORMANCE IN DYNAMOMETER AND EMISSIONS OF WASTE AN AGRICULTURAL TRACTOR ENGINES OPERATING WITH BINARY MIXTURES B5 DIESEL AND BIODIESEL OIL CHICKEN
Brazil, the third largest producer of biodiesel in the world, and also the third largest producer of chicken, may increase in some regions, the use of oil derived from birds, as an alternative to fossil fuels. In order to increase the range of options to reduce dependence on soybean oil for that purpose, and fostering environmental aspects, it is possible to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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17. Emprego da Técnica de pcr em tempo real na detecção de DNA de Brucella spp em lesões de carcaças e vísceras provenientes de matadouros- frigoríficos sob inspeção federal. / Real-Time PCR detection of Brucella spp in lesions of carcasses and visceras from slaughterhouses under Federal Inspection
Brucellosis is a chronic infectious disease caused by bacterium of the genus Brucella, which affects humans and different species of animals. Despite the implementation of programs aimed at the disease controlling and eradicating, brucelosis is endemic in many countries, especially in developing ones, resulting in significant economic losses and serious impl
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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18. âUma Proposta de Projeto Para Inversor MultinÃvel em Cascata AssimÃtrico com 63 NÃveis na TensÃo de SaÃda e OperaÃÃo em Baixa FrequÃnciaâ / "Design Proposition For a 63 Levels Output Voltage Asymmetric Multilevel Cascaded Inverter at low Frequency Operation"
This dissertation proposes a design of a cascaded multilevel inverter using H-bridge cells in asymmetric configuration and a multiple secondary transformer. Equations for determining the frequency operation of each cell with binary and ternary configurations, as well as the complete design of toroidal transformer with laminated core. This work proposes also
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2011
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19. Root temperature and energy consumption at different cable depths in electrically heated substrates
A finite element method-based model of a substrate heated by an electric heating cable buried in a thermal isolated container was experimentally validated with root mean square error values of root zone temperature ranging 0.25 to 0.62 ºC. The two-dimensional transient model allowed variations in the physical properties of the substrate with temperature, wa
Scientia Agricola. Publicado em: 2011-10
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20. Determination of the critical period of weed control in corn using a thermal basis.
Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period fo weed control in maize (Zea mays L.). The treatment consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields rep
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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21. Conversor CC/CA de alta freqüência baseado em inversores ressonantes com comutação seqüencial para excitação de uma tocha indutiva a plasma térmico
This work describes the study, the analysis, the project methodology and the constructive details of a high frequency DC/AC resonant series converter using sequential commutation techniques for the excitation of an inductive coupled thermal plasma torch. The aim of this thesis is to show the new modulation technique potentialities and to present a technologi
Publicado em: 2010
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22. Fabrication and characterization of tellurite and germanate waveguides for optoelectronics applications. / Produção e caracterização de guias de onda de telureto e germanato para aplicações em optoeletrônica.
The objective of this work is the production and characterization of GeO2-PbO and TeO2-ZnO waveguides. The waveguides were produced using thin films and glasses by means of different procedures. The films were produced using the RF magnetron sputtering method and characterized by a variety of techniques. In particular, scanning electron microscopy was essent
Publicado em: 2010
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23. Ablative and mechanical properties of quartz phenolic composites
Abstract. Quartz phenolic composites have been applied to thermal protection systems (TPSs) for reentry vehicles since the late fifties due to their excellent ablative resistance and mechanical performance. TPSs must withstand the aggressive reentry environment, such as atomic oxygen, when submitted to very high temperatures (> 1000° C) and heat flux. The a
J. Aerosp. Technol. Manag.. Publicado em: 2009-06
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24. Análise do desempenho térmico de um sistema de aquecimento solar utilizando coletor com superfície absorvedora em chapas de PVC
Its presented a solar collector to be used in a system for heating bath water, whose main characteristic is its low cost. The collector consists of five plates of PVC with 10 mm thick, 200 mm in width and 1400mm in length, with an area equal to 1.4 square meters. The plates were connected in parallel to the ends of PVC tubes of 40 mm and 32
Publicado em: 2009