Análise espaço-temporal dos plantios de Eucalyptus spp no Estado de São Paulo.
Brazil has nearly 5 million hectares of forest planted with species of the genus Eucalyptus and Pinnus and nearly 70% of these forests are for the manufacture of cellulose pulp. Eucalyptus planted forests are being implemented in different regions of the country, developing at sites with different t...
por Portal Padrão
publicado
22/08/2011
4:21 PM
Observations of natural cloud-to-ground lightning leaders from simultaneous high-speed video recordings and electric field measurements.
The aim of this investigation is to analyze the phenomenology of positive and negative (stepped-, dart- and recoil) leaders observed in natural lightning from simultaneous high-speed video recordings and electric field measurements. For that intent we have used two different high-speed cameras (obta...
por Portal Padrão
publicado
22/08/2011
4:19 PM
High-speed video observations of β2-type leaders in negative lightning: a manifestation of recoil leaders initiated inside the cloud?
Schonland et al. (1938), in their seminal streak camera studies of lightning, have identified a peculiar type of negative stepped leader that they termed β, a rather rare variant of the type β leader and in it the second and slower stage of the leader is associated with the appearance of one or mo...
por Portal Padrão
publicado
22/08/2011
3:24 PM
A 11-year study about the spatial and temporal variations of the lightning flash density in the southeastern Brazil.
Lightning data obtained by the Brazilian Lightning Detection Network (BrasilDat) in the southeastern region of Brazil (latitudes from 22S to 24S and longitudes from 43W to 47.4W) from 1999 to 2009 were studied in terms of spatial and temporal variations of the flash counts. The spatial variation sho...
por Portal Padrão
publicado
22/08/2011
3:21 PM
Transição floresta-savana: distribuição espacial de fitofisionomias.
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por Portal Padrão
publicado
22/08/2011
3:19 PM
Seasonal variability of vegetation and climate in the brazilian savanna: remote sensing and modeling approaches.
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por Portal Padrão
publicado
22/08/2011
3:17 PM
Preliminary study of atmospheric methane emissions in a lentic systems.
The decaying organic matter releases, among other gases, methane (CH4), composed of semi-opaque to infrared radiation has an important role in the greenhouse. The knowledge of how the lentic systems emit gases from the anaerobic decomposition of non lignified material, primarily composed of herbaceo...
por Portal Padrão
publicado
22/08/2011
3:15 PM
Caracterização da emissão de metano para a atmosfera na Lagoa Rodrigo de Freitas, RJ.
A rede hidrográfica brasileira tem grande potencial para a geração de energia por meio da implantação de usinas hidrelétricas. O entendimento de como ocorrem os processos de emissão de gases de efeito estufa em reservatórios de centrais hidrelétricas vem sendo amplamente questionado por div...
por Portal Padrão
publicado
22/08/2011
3:14 PM
Determinação do fluxo de metano em reservatórios de hidroelétrica.
A decomposição de matéria orgânica libera o metano (CH4), composto com destacado papel na regulação da temperatura do planeta. Este trabalho apresenta resultados preliminares da emissão deste gás na região aonde será instalada a usina hidrelétrica de Santo Antônio, em Rondônia, projeto ...
por Portal Padrão
publicado
22/08/2011
3:11 PM
Lightning density along Itaipu transmission lines.
Density maps are one of the most common and powerful use of lightning data, and its application became as more efficient as more detailed the maps are. When leading with data from Lightning Location Systems (LLSs), which means a stochastic phenomenon that depends on several detection conditions, som...
por Portal Padrão
publicado
22/08/2011
2:43 PM
Lightning distribution maps and perception scale
Lightning distribution maps as a climatological approach are often associated to physical effects (geographical and meteorological aspects). Despite of some concerns regarding the lightning location systems (LLS) performance for some specific regions, the physical effects are fairly clear and the re...
por Portal Padrão
publicado
22/08/2011
2:41 PM
Extracting the eveolution of land cover objects from remote sensing image series
We live in a changing world and this acceleration of change provides a strong motivation for research in GeoInformatics. Our tools and methods for representing and handling land cover data should be capable of dealing with change. In this work we developed a land cover model to handle the evolution ...
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