Solar Activity
Mostrando 25-36 de 113 artigos, teses e dissertações.
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25. TiO2 e TiO2 dopado com ferro : efeitos da inserção do dopante e da segregação de hematita nas propriedades e na atividade fotocatalítica para conversão de energia solar / TiO2 and iron doped TiO2 : effects of the dopant insertion and hematite segregation on the properties and photocatalytic activity for solar energy conversion
Nanopartículas de TiO2 foram preparadas por método sol-gel a partir da hidrólise de isopropóxido de titânio, tratamento hidrotérmico (200 °C, 8 h) e calcinação (450 °C, 30 min); amostras de TiO2 dopado com ferro (Fe:TiO2) foram obtidas pela mesma metodologia incluindo nitrato férrico nos precursores (razão molar Fe/Ti de 1, 3 e 5%). Para compara�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2011
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26. Influência das variabilidades solar, geomagnética e atmosférica na modulação da intensidade de raios cósmicos / Influence of solar, geomagnetic and atmospheric activities in cosmic ray intensity modulation
Cosmic ray is influenced by solar, geomagnetic and atmospheric phenomena. In this Thesis are presented studies with the cosmic ray data regarded by the CARPET detector, which is installed in the Argentinean Andes, between 2006 and 2008. The variations in the cosmic ray count rate related to rain, temperature, atmospheric pressure and atmospheric electric fie
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/05/2011
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27. Optimization studies on production of a salt-tolerant protease from Pseudomonas aeruginosa strain BC1 and its application on tannery saline wastewater treatment
Treatment and safe disposal of tannery saline wastewater, a primary effluent stream that is generated by soaking salt-laden hides and skin is one of the major problems faced by the leather manufacturing industries. Conventional treatment methods like solar evaporation ponds and land composting are not eco-friendly as they deteriorate the ground water quality
Braz. J. Microbiol.. Publicado em: 2011-12
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28. Nitrate reductase activity in field-grown pueraria lobata (Kudzu) in southeastern Brazil.
Although Pueraria lobata (Willd.) Ohwi (P. thunbergiana) (Sieb. & Zucc.) Benth.) is thus ecologically and economically important in much to world, its physiological ecology and other factor contributing to its invasive growth are not well understood. Nitrate reductase activity (NRA) measurements have long been used to indicate the effect of changes in the en
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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29. Ecophysiological studies of two andean forest contrasting species Abatia parviflora and Myrcianthes leucoxyla under Bogotá conditions, Colombia
The physiological response of high Andean forest contrasting plants, Myrcianthes leucoxyla, a shadow-facultative heliophyte, and Abatia parviflora, a heliophyte, was studied during the transition from dry season to wet season in Bogotá. Light response curves (A-PAR), water potential (Ψw), transpiration rate (E), stomatal conductance (gs), leaf soluble prot
Brazilian Journal of Plant Physiology. Publicado em: 2011
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30. Auroral electron precipitating energy during magnetic storms with peculiar long recovery phase features / Energia de precipitação auroral de elétrons durante tempestades magnéticas com características peculiares de longa fase de recuperação
Aurora, light emissions generated by collisions between energetic electrons and atmospheric particles, is often seen in the polar region. Although much is known about the aurora, there are still many questions unanswered. For example, it is not well known what is the source of the energetic particles or by what processes the particles are energized. Understa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2010
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31. Characterization of traveling ionospheric disturbances over low latitude brazilian region associated to Perkins plasma instability generated at medium latitudes / Caracterização de distúrbios ionosféricos propagantes na região de baixas latitudes no setor brasileiro associados à instabilidade de plasma Perkins gerada em médias latitudes
With ground based measurements of OI 630 nm emission, by using all-sky imaging system installed at Cachoeira Paulista, we investigated the occurrence of specific events of Medium Scale Traveling Ionospheric Disturbances (MSTIDs), which occurred during nights geomagnetically quiet. Probably, these disturbances are associated with Perkins plasma instability ge
Publicado em: 2010
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32. Estudo da ionosfera da região brasileira com dados dos satélites FORMOSAT-3/COSMIC e de Digissondas / Study of Brazilian region ionosphere using data from the FORMOSAT-3/COSMIC Satellites and Digisondes
Este trabalho visa melhorar o estudo da ionosfera da região brasileira com a utilização de dados da constelação de satélites FORMOSAT-3/COSMIC que fornece dados globais da atmosfera quase em tempo real. Os dados ionosféricos destes satélites permitem a construção de mapas dos parâmetros para monitorar o desenvolvimento e a manutenção das estrutu
Publicado em: 2010
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33. Purification and characterization of an extreme halothermophilic protease from a halophilic bacterium Chromohalobacter sp. TVSP101
An extreme halophilic bacterium was isolated from solar saltern samples and identified based on biochemical tests and 16S r RNA sequencing as Chromohalobacter sp. strain TVSP101. The halophilic protease was purified using ultrafiltration, ethanol precipitation, hydrophobic interaction column chromatography and gel permeation chromatography to 180 fold with 2
Brazilian Journal of Microbiology. Publicado em: 2009-03
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34. Geomagnetic DST index forecast using artificial neural networks and decision tree / Previsão do índice geomagnético dst utilizando redes neurais artificiais e árvore de decisão
The Earth suffers constant influence of the solar activity through the solar wind, which brings with it the resulting structures, mainly phenomena like solar flares and coronal mass ejection. The almost static interaction between the solar wind and the geomagnetic field forms a structure called magnetosphere, which acts as a shield that protects the planet f
Publicado em: 2009
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35. Atmospheric patterns associated with concentrations of tropospheric ozone in the metropolitan region of Sao Paulo / Padrões atmofésricos associados a concentrações de ozônio troposférico na região metropolitana de São Paulo
In the past few years, tropospheric ozone has been noticed to exceed the states environmental agency (CETESB) air quality standards more than any other air pollutant in the Sao Paulo Metropolitan Area (SPMA), Brazil. Its assumed that different atmospheric patterns are responsible for different impacts on ozone concentrations, due to already known phenomena c
Publicado em: 2009
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36. Preparação e caracterização de eletrodos de titanatos para aplicação em conversão de energia solar / Preparation and characterization of titanate electrodes for solar energy conversion
Thin porous films electrodes of titanates H2Ti2O5, H2Ti4O9 and H2Ti8O17 were prepared and investigated. The titanates were synthesized through solid state reactions by heating mixtures of TiO2 and K2CO3; after HCl treatment for ion exchange, the samples were rinsed with water. X-ray diffraction and scanning electron microscopy indicated that, depending on th
Publicado em: 2009