Avaliação das previsões do atraso zenital troposférico para a América do Sul, obtidas usando modelo de previsão numérica de tempo com alta resolução espacial

A Center for Weather Forecast and Climatic Studies of National Institute for Space Research (CPTEC/INPE) has provided to the Brazilian Geodetic community, since 2004, an alternative to correct the GNSS observables from the tropospheric refraction. Numerical Weather Prediction (NWP) Model is used to generate Zenital Tropospheric Delay (ZTD). For the version 1, it was developed a model with horizontal resolution of 100 km, which was updated with Eta model, with resolution of 20 km. This paper provides the most significative details of the current version, as well an evaluation of its quality, using for such ZTD estimates from GPS data collect at RBMC. Comparing to the old version, considerable improvement could be observed from the new model, mainly in Brasilia and Curitiba, reaching up to 55% improvement. When all stations were used in the quality control, almost null bias and RMS of about 4 to 5 cm could be observed.

Complexo regional de segurança da América do Sul: uma nova perspectiva

The current article aims to update the discussion on the South American context making use of the theory of Regional Security Regional Complexes (RSC). It begins with a theoretical discussion, based on Buzan and Wæver's work. It then presents the hypothesis that, differently from what is assumed in the literature, the South American RSC is not a standard one, but a centred one, in which the centre is not a global power. An empirical analysis follows, showing that Brazil possesses the necessary resources, and has presented some cogent political initiatives, such as the creation of the Union of South American Nations (Unasur) and its Defense Council (SDC), but in other moments has been reluctant take a leadership role in South America. The analysis concludes that, regarding its configuration, the South American RSC corroborates the authors' hypothesis and that Brazil should consolidate its role at the centre of such a complex.

As maras e pandillas no Triângulo Norte da América Central e a atuação dos Estados Unidos em seu combate

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Morfologia comparada da asa da Tesourinha (Tyrannus Savana) na América do Sul

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Comparação dos resultados da gravidez molar entre adolescentes da América do Norte e da América do Sul

Pós-graduação em Ginecologia, Obstetrícia e Mastologia - FMB