Stationary Sources
Mostrando 13-24 de 113 artigos, teses e dissertações.
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13. Estudo comparativo entre teoria construtal e entrânsia para casos de resfriamento de fontes de calor em cavidade / Comparactive study between constructal theory end the entransy treory for the cooling cases of heat sources in a cavity
In the present work the cooling was treated by natural convection of one, three and five sources localized in a vertical wall of a rectangular cavity. One has approximated numerically the temperature field in the stationary state at different positions for each case. The conductivity and the dissipation of entransy were evaluated in all these cases and their
Publicado em: 2009
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14. Aerosol particle size distributions at a traffic exposed site and an urban background location in Oporto, Portugal
Aerosol size distributions from 6 to 700 nm were measured simultaneously at an urban background site and a roadside station in Oporto. The particle number concentration was higher at the traffic exposed site, where up to 90% of the size spectrum was dominated by the nucleation mode. Larger aerosol mode diameters were observed in the urban background site pos
Química Nova. Publicado em: 2009
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15. Quantification and source identification of atmospheric particulate polycyclic aromatic hydrocarbons and their dry deposition fluxes at three sites in Salvador Basin, Brazil, impacted by mobile and stationary sources
O presente trabalho apresenta o estudo sobre 16 HPAs prioritários em material particulado atmosférico de três sítios próximos a Salvador-BA: (i) Estação da Lapa, estação de ônibus da Região Metropolitana de Salvador; (ii) Porto de Aratu, impactado por intenso movimento de matérias-primas e (iii) Bananeira, localizado na Ilha de Maré, vilarejo qu
Journal of the Brazilian Chemical Society. Publicado em: 2009
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16. Extração de preferências por meio de avaliações de comportamentos observados. / Preference elicitation using evaluation over observed behaviours.
Recently, computer systems have been delegated to accomplish a variety of tasks, when the computer system can be more reliable or when the task is not suitable or not recommended for a human being. The use of preference elicitation in computational systems helps to improve such delegation, enabling lay people to program easily a computer system with their ow
Publicado em: 2009
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17. Descarbonization of dominant energetic regime : perspectives on economy of hydrogen in Brazil / Descarbonização do regime energetico dominante : perspectivas para a economia do hidrogenio no Brasil
In the last decades technological development of energy sector has evolved in connection with environmental worries, in as much as these ones have also influenced options for some specific energetic technologies. Current context is characterized by fossil fuel and intemal-combustion engine, such reality presents steady increase of energy consume and brings d
Publicado em: 2008
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18. Método de estimação de espectro direcional de ondas baseado em movimentos de 1ª ordem de sistemas oceânicos: validação em escala reduzida e verificação em escala real. / Directional wave spectrum estimation method based on first order motions of offshore systems: model-scale validation and real-scale verification.
This text is about estimating directional wave spectra based on first order motions of stationary systems by means of a bayesian inference method. After being described the method and its main sources of uncertainties discussed, an experimental validation was carried out with two different types of hulls for irregular waves and bimodal seas, with a posterior
Publicado em: 2008
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19. Avaliação da disponibilidade energética em atividade física realizada em bicicleta estacionária
Nowadays, the search of better life quality is related, invariably, to the developed practice of physical activity mainly at gyms. Although in these places, there is considerable expenditure of human energy, they are not characterized as an energy management model that can reflect in considerable economy in monthly electric energy consumption. The conception
Publicado em: 2008
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20. Padrões de circulação anômala associados a episódios úmidos e secos no sul do Brasil / Anomalous circulation patterns associated with wet and dry events in southern Brazil
The characteristics of the atmospheric circulation associated with persistent wet and dry events in Southern Brazil during all seasons were studied from 1979 to 2002, using precipitation pentad data. The result shows that the dominant oscillations of rainfall variability have periods between 2 and 6 pentads. Superposition of different periods was also identi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/04/2007
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21. Rotating and counterrotating relativistic thin disks as sources of stationary electrovacuum spacetimes
A detailed study is presented of the counterrotating model (CRM) for electrovacuum stationary axially symmetric relativistic thin disks of infinite extension without radial stress, in the case when the eigenvalues of the energy-momentum tensor of the disk are real quantities, so that there is not heat flow. We find a general constraint over the counterrotati
Brazilian Journal of Physics. Publicado em: 2007-09
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22. Transition models for binary data / Modelos de transição para dados binários
Binary or dichotomous data are quite common in many fields of Sciences in which there is an interest in registering the occurrence of a particular event. On the other hand, when each sampled unit is evaluated in more than one occasion, we have longitudinal data or repeated measures over time. It is also common, in longitudinal studies, to have explanatory va
Publicado em: 2007
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23. Monitoring and evaluation of ducts and stationary source emissions from ceramic industries by potntiometry and X-ray fluorescence methods / Monitoramento e avaliação da emissão de dutos e fontes estacionarias de industrias ceramicas por meio de metodo potenciometrico e fluorescencia de raios X
O objetivo deste trabalho foi monitorar e avaliar a emissão de fluoreto e de metais de dutos e fontes estacionárias de indústrias cerâmicas da região do Pólo Cerâmico de Santa Gertrudes (SP). Nos últimos anos houve um crescimento das empresas neste setor, causando reflexos ambientais nesta região responsável por 60% da produção de pisos esmaltado
Publicado em: 2007
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24. Environmental factors influence evaluation on the structure, dynamics and optical properties of the aquatic humic substances form the "Rio Negro" - Amazonas / Avaliação da influência de fatores ambientais na estrutura, dinâmica e propriedades ópticas das substâncias húmicas aquáticas do Rio Negro
Nowadays, one of the major world concerning is focused in the increasing of the damaging ultraviolet (UV) radiation and its impact on the aquatic ecosystems. In addition, the Rio Negro, one of the principal tributaries of the Amazon Basin, is an appropriate site for studying the influence of the UV radiation in the dissolved organic matter (DOM) biogeochemis
Publicado em: 2007