Height above the nearest drainage, a hydrologically relevant new terrain model.
This paper introduces a new terrain model named HAND, and reports on the calibration and validation of landscape classes representing soil environments in Amazonia, which were derived using it. The HAND model normalizes topography according to the local relative heights found along the drainage netw...
por Portal Padrão
publicado
22/08/2011
1:58 PM
Por trás da seca na Amazônia.
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por Portal Padrão
publicado
22/08/2011
1:56 PM
New remains of a gavialoid crocodilian from the late Oligocene-early Miocene of the Pirabas formation, Brazil.
New specimens of gavialoids collected from the Pirabas Formation, Brazil, provide additional information about the evolutionary evolution of Gavialoidea during the late Oligocene-early Miocene. We describe a specimen that has a more gracile symphyseal mandible than any other South American gavialoid...
por Portal Padrão
publicado
22/08/2011
1:55 PM
Estudo comparativo da confiabilidade de estimativas de irradiação solar para o sudeste brasileiro obtidas a partir de dados de satélite e por interpolação/extrapolação de dados de superfície.
O aproveitamento da energia solar vem se tornando viável economicamente e, atualmente, é a que vem apresentando maior crescimento mundial. O conhecimento da disponibilidade de energia solar na superfície é um fator essencial para incentivar novos investimentos em sistemas de geração o de energ...
por Portal Padrão
publicado
22/08/2011
1:53 PM
Enhancing information for solar and wind energy technology deployment in Brazil reference.
Brazils primary energy matrix is based on more than 47% of renewables, and more than 85% of its electricity is generated by hydro power sources. Despite this large fraction of renewable energy resources, less than 0.3% of the national energy supply comes from solar or wind sources. This paper presen...
por Portal Padrão
publicado
22/08/2011
1:52 PM
Worldwide stable carbon and nitrogen isotopes of Big Mac (R) patties: an example of a truly “glocal” food.
The Big Mac (R), McDonald's (R) signature burger, is a global food served in over 100 countries. We measured carbon (delta(13)C) and nitrogen (delta(15)N) stable isotope ratios of Big Macs (R) from twenty-six countries. The delta(13)C values varied from -25.4%. to -11.1%, representing cattle-rearing...
por Portal Padrão
publicado
22/08/2011
1:50 PM
The drought of 2010 in the context of historical droughts in the Amazon region.
The year 2010 featured a widespread drought in the Amazon rain forest, which was more severe than the "once-in-a-century" drought of 2005. Water levels of major Amazon tributaries fell drastically to unprecedented low values, and isolated the floodplain population whose transportation depends upon o...
por Portal Padrão
publicado
22/08/2011
1:48 PM
A Geographical approach to self-organizing maps algorithm applied to image segmentation.
Image segmentation is one of the most challenging steps in image processing. Its results are used by many other tasks regarding information extraction from images. In remote sensing, segmentation generates regions according to found targets in a satellite image, like roofs, streets, trees, vegetatio...
por Portal Padrão
publicado
22/08/2011
1:47 PM
Concurrent climate impacts of tropical South America land-cover change.
The climatic effects of concurrent land-cover changes in Amazonia and Northeast Brazil (NEB) were evaluated by simulations using the Center for Weather Forecasting and Climate Studies Atmospheric General Circulation Model (CPTEC-AGCM). Three experiments were performed: Amazon savannization, NEB dese...
por Portal Padrão
publicado
22/08/2011
1:45 PM
Satellite-based estimates of groundwater storage variations in large drainage basins with extensive floodplains.
This study presents monthly estimates of groundwater anomalies in a large river basin dominated by extensive floodplains, the Negro River Basin, based on the synergistic analysis using multisatellite observations and hydrological models. For the period 2003-2004, changes in water stored in the aquif...
por Portal Padrão
publicado
22/08/2011
1:43 PM
Impact of global warming on the geobotanic zones: an experiment with a statistical-dynamical climate model.
In this study, a zonally-averaged statistical climate model (SDM) is used to investigate the impact of global warming on the distribution of the geobotanic zones over the globe. The model includes a parameterization of the biogeophysical feedback mechanism that links the state of surface to the atmo...
por Portal Padrão
publicado
22/08/2011
1:42 PM
Forecast of solar energy resource by using neural network methods.
This work aims at discussing the artificial neural networks (ANN) and some applications in renewable energy assessment. First, the paper describes the statistical relevance of this tool in different areas of knowledge and the main ANN concepts and configurations. Finally, the paper presents and disc...
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