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Mostrando 13-24 de 235 artigos, teses e dissertações.
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13. Mathematical / Statistical and Physical / Meteorological Models for Short-term Prediction of Wind Farms Output
(...)The rapid increase of the wind power penetration in the conventional grids all over the world has been requiring (from electricity companies and wind farm promoters) a special attention to the short-term prediction of wind farms output. Fomented by interest and necessity, companies and promoters are collaborating with universities and other research cen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/12/2005
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14. Projeto e implementaÃÃo de sistemas multiagentes: o caso tropos
Sistemas Multi-Agentes (SMA) sÃo sistemas altamente distribuÃdos, ou seja, que nÃo possuem um Ãnico ponto de controle, e que utilizam uma coleÃÃo de agentes. Um agente pode ser visto como um sistema computacional encapsulado que està situado em algum ambiente e à capaz de realizar aÃÃes autÃnomas e ter um comportamento flexÃvel neste ambiente, co
Publicado em: 2005
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15. Model for the evaluation of the credit risk of Brazilian cities / Modelo para a avaliação do risco de crédito de municípios brasileiros
As many on public area as on private area, the financing needs are relative to investment decisions. For each monetary unit to be invested there is need to obtain funds to financing. When questions are made about this issues financing needs- and those questions are associated to municipal finances, one hiatus appears at this moment, wich there wasnt stud
Publicado em: 2004
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16. Avaliação de imagens QUICKBIRD na análise geográfica de um setor da Mata Atlântica do Rio Grande do Sul / Geographic analysis of a Mata Atlântica site in Rio Grande do Sul state - Brazil using QUICKBIRD imagery.
In 1994, the Center for Research and Nature Conservation (PRÓ-MATA) was created, looking forward to develop studies and actions for the protection and recovery of the ecosystems from a sector of "Mata Atlântica" in Rio Grande do Sul, Brazil. PRÓ-MATA was conceived from the cooperation between the Catholic University of Rio Grande do Sul (PUCRS - Pontifíc
Publicado em: 2003
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17. "A biblioteca virtual do estudante brasileiro da Escola do Futuro da Universidade de São Paulo: um estudo da sua estrutura e dos seus usuários" / The Brazilian Student s Virtual Library of The School of the Future of The University of São Paulo: a study of its structure and its users.
Bibvirt, the Brazilian Students Virtual Library, is an on-going activity of research and development of the School of the Future, interdisciplinary research laboratory of theUniversity of São Paulo, Brazil. The present study attempted (1) to determine if this digital library, started in 1997 and available gratuitously through the Internet [www.bibvirt
Publicado em: 2002
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18. Discriminacao de lateritas mineralizadas em ferro no deposito de N1 (Carajas-PA) por radar imageador: uma avaliacao atraves de classificacao textural / Discrimination of iron ore laterites in the deposit N1 (Crajas - PA) using radar imagery: an evaluation through textural classification
The use of imaging SAR presents a high potencial for geological applications in cloudy cover regions, such as the Brazilian Amazon, due to the side viewing geometry and the longer wavelengths, which result in the enhancement of the terrain and the all-weather sensing capability. As the macro and micro topography are normally highlighted in the Syntetic Apert
Publicado em: 1998
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19. Orientation by Untrained Pigeons Requires the Sun
Untrained homing pigeons released on sunny days oriented homeward regardless of the direction of the release site from the loft. Similar pigeons released under total overcast vanished randomly, whereas experienced birds released on the same days at the same sites oriented homeward. Apparently untrained pigeons require the sun for orientation but experienced
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20. Object-oriented Transcription Factors Database (ooTFD)
ooTFD (object-oriented Transcription Factors Database) is an object-oriented successor to TFD. This database is aimed at capturing information regarding the polypeptide interactions which comprise and define the properties of transcription factors. ooTFD contains information about transcription factor binding sites, as well as composite relationships within
Oxford University Press.
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21. Hydroxyl radical footprints and half-site arrangements of binding sites for the CysB transcriptional activator of Salmonella typhimurium.
CysB is a transcriptional activator for the cysteine regulon and negatively autoregulates its own gene, cysB. Transcription activation also requires an inducer, N-acetyl-L-serine. CysB is known to bind to activation sites just upstream of the -35 regions of the positively regulated cysJIH, cysK, and cysP promoters and to a repressor site centered at about +1
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22. RecBCD enzyme is altered upon cutting DNA at a chi recombination hotspot.
During its unidirectional unwinding of DNA, RecBCD enzyme cuts one DNA strand near a properly oriented Chi site, a hotspot of homologous genetic recombination in Escherichia coli. We report here that individual DNA molecules containing two properly oriented Chi sites were cut with about 40% efficiency at one or the other Chi site but not detectably at both C
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23. Dynamics and orientation of N+(CD3)3-bromoacetylcholine bound to its binding site on the nicotinic acetylcholine receptor
Dynamic and structural information has been obtained for an analogue of acetylcholine while bound to the agonist binding site on the nicotinic acetylcholine receptor (nAcChoR), using wide-line deuterium solid-state NMR. Analysis of the deuterium lineshape obtained at various temperatures from unoriented nAcChoR membranes labeled with deuterated bromoace
The National Academy of Sciences.
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24. The Escherichia coli L-arabinose operon: binding sites of the regulatory proteins and a mechanism of positive and negative regulation.
The locations of DNA binding by the proteins involved with positive and negative regulation of transcription initiation of the L-arabinose operon in Escherichia coli have been determined by the DNase I protection method. Two cyclic AMP receptor protein sites were found, at positions -78 to -107 and -121 to -146, an araC protein--arabinose binding site was fo