Results 21 to 30 of about 62,374 (135)

Solução de um Problema de Transporte de Contaminante em Corpos Hídricos Utilizando o Método dos Volumes Finitos

Revista Cereus, 2021
As water is one of the fundamental resources for the quality of life and existence of future generations, environmental preservation becomes the duty of every human being. However, the existence of some type of pollution in most rivers in Brazil is noteworthy and, faced with situations like this worldwide, the United Nations itself emphasizes the ...
Anna Luisa Soares Castro Coimbra, Wagner Rambaldi Telles, Fábio Freitas Ferreira, Jader Lugon Junior   +3 more
openaire   +2 more sources

On the binarity of the classical Cepheid X Sgr from interferometric observations

, 2012
Optical-infrared interferometry can provide direct geometrical measurements of the radii of Cepheids and/or reveal unknown binary companions of these stars.
Antoniucci, S., Bono, G., Causi, G. Li, Giannini, T., Lorenzetti, D., Nisini, B., Pedicelli, S.   +6 more
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Evidence of an asymmetrical Keplerian disk in the Br{\gamma} and He I emission lines around the Be star HD 110432 [PDF]

, 2012
Context. HD 110432 was classified as a "\gamma Cas X-ray analog" since it has similar peculiar X-ray and optical characteristics, i.e. a hard-thermal X-ray variable emission and an optical spectrum affected by an extensive disk. Lopes de Oliveira et al. (
Bendjoya, Ph., Duvert, G., Hofmann, K. -H., Massi, F., Meilland, A., Millour, F., Smith, M., Spang, A., Stee, Philippe   +8 more
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Observing the Seyfert 2 nucleus of NGC 1068 with the VLT Interferometer

, 2004
Dusty tori have been suggested to play a crucial role in determining the physical characteristics of active galactic nuclei (AGN), but investigation of their properties has stalled for lack of high resolution mid-IR imaging.
Jaffe, Walter, Leinert, Christoph, Meisenheimer, Klaus, Richichi, Andrea, Rottgering, Huub, Sol, Helen, Wittkowski, Markus   +6 more
core   +2 more sources

What causes the large extensions of red-supergiant atmospheres? Comparisons of interferometric observations with 1-D hydrostatic, 3-D convection, and 1-D pulsating model atmospheres

, 2015
We present the atmospheric structure and the fundamental parameters of three red supergiants, increasing the sample of RSGs observed by near-infrared spectro-interferometry.
Abellan, F. J., Arroyo-Torres, B., Chiavassa, A., Freytag, B., Hauschildt, P. H., Marcaide, J. M., Scholz, M., Wittkowski, M., Wood, P. R.   +8 more
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Equação de Riccati na descrição do movimento de um veículo por meio de uma propulsão hidráulica

CQD Revista Eletrônica Paulista de Matemática, 2017
Nesse artigo é analisado o movimento retilíneo de um veículo adquirido pela ação de um jato de água propelido por uma catapulta hidráulica em um tempo finito onde o parâmetro é a velocidade do jato.
Jorge Corrêa de Araújo, Rosa García Márquez   +1 more
doaj  

Universal restrictions to the conversion of heat into work derived from the analysis of the Nernst theorem as a uniform limit

, 2003
We revisit the relationship between the Nernst theorem and the Kelvin-Planck statement of the second law. We propose that the exchange of entropy uniformly vanishes as the temperature goes to zero. The analysis of this assumption shows that is equivalent
, Alfredo Rey de Luna, Baierlein R, Balian R, Belgiorno F, Carathéodory C, Clausius R, Epstein P, Huang K, Jones D S, Jos Mar a Mart n-Olalla, Kestin J, Kestin J (ed), Landau L, Landsberg P, Landsberg P, Landsberg P, Liboff R, Mafé S, Nernst W, Nernst W, Oppenheim I, Planck M, Rose-Innes C, Thomson W, Wu J, Yan Z, Zemansky M   +27 more
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Precisão de métodos de volumes finitos para a solução da equação de Buckley-Leverett

Proceeding Series of the Brazilian Society of Computational and Applied Mathematics, 2018
Metodos cuja ordem formal de convergencia e alta (≥ 2) tem bastante popularidade na solucao numerica de leis de conservacao hiperbolicas, em particular da equacao de Buckley-Leverett que descreve escoamentos bifasicos em meios porosos. Porem, nas aplicacoes, as hipoteses que permitem provar a convergencia de alta ordem sao raramente satisfeitas.
Franciane Fracalossi Rocha, Vitor Alves Pires, Fabricio Simeoni de Sousa, Gustavo Carlos Buscaglia   +3 more
openaire   +2 more sources

MÉTODO DE VOLUMES FINITOS MULTIESCALA PARA RESERVATÓRIOS HETEROGÊNEOS E ANISOTRÓPICOS

Revista Interdisciplinar de Pesquisa em Engenharia - RIPE, 2017
Os métodos multiescala permitem obter de forma eficiente, resultados acurados para as equações de fluxo em reservatórios de petróleo muito heterogêneos, em  qualquer nível de escala. Um desafio para as metodologias multiescala existentes atualmente e, em particular, para o Método de Volumes Finitos Multiescala (MsFVM), consiste na modelagem do ...
Barbosa, Lorena M. C., Carvalho, Darlan K. E., Lyra, Paulo R. M., Antunes, Alessandro R. E.   +3 more
openaire   +2 more sources

Ecological factors affecting Alpine chamois population recruitment: remote sensing can support adaptive management [PDF]

, 2016
The analysis of ecological factors able to affect the life history traits of ungulates is important to reveal key information on population dynamics of wild herbivores.
Apollonio, Marco, Chirichella, Roberta, Orler, Filippo, Rocca, Michele, Sitzia, Tommaso   +4 more
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