Hydro-meteorological hazards like convective\ud
outbreaks leading to torrential rain and floods are among the\ud
most critical environmental issues world-wide. In that context\ud
weather radar observations have proven to be very useful\ud
in providing information on the spatial distribution of rainfall\ud
that can support early warning of floods. However, quantitative\ud
precipitation estimation by radar is subjected to many\ud
limitations and uncertainties. The use of dual-polarization\ud
at high frequency (i.e. X-band) has proven particularly useful\ud
for mitigating some of the limitation of operational systems,\ud
by exploiting the benefit of easiness to transport and\ud
deploy and the high spatial and temporal resolution achievable\ud
at small antenna sizes. New developments on X-band\ud
dual-polarization technology in recent years have received\ud
the interest of scientific and operational communities in these\ud
systems. New enterprises are focusing on the advancement of\ud
cost-efficient mini-radar network technology, based on highfrequency\ud
(mainly X-band) and low-power weather radar\ud
systems for weather monitoring and hydro-meteorological\ud
forecastin
Os 'caboclos' da Amazônia brasileira estão classificados variavelmente como camponeses, extratores, povo rústico e descendentes miscigenados de europeus, indígenas e africanos. Em quase todos os usos se reconhece um tom pejorativo e raramente usado para chamar uma pessoa do mesmo nível social. As poucas pessoas que se identificam como 'caboclo' usam a palavra para referir-se a si mesmos, a não ser em condições especiais. Aceita-se que uma das finalidades das ciências sociais, particularmente a antropologia, é entender todas as culturas no mesmo nível e dar-lhes a mesma integridade que damos a nossa. Por que, então, insistimos em usar este termo? Esta pesquisa examina esta dúvida através da discussão sobre a representação e o uso de autoridade na documentação etnográfica
This article examines the economic and political conditions leading to social conflict and to political activism by small farmers and rubber/timber extractors in the rural Amazonian community of Gurupá, Brazil. Gurupá's case is compared with a general “frontier scenario” in which activism is generated by severe dislocations affecting land tenure and social relations of production, as well as by violence. None of these dislocations, however, is very marked in Gurupá. Instead, conflict and activism are prodded by market‐based tensions and, to a lesser degree, political tensions. This article also describes farmer/extractor mobilization in Gurupá, with particular attention paid to the role of the progressive sector of the Catholic church. [Amazon, social conflict, small‐farmer mobilization, liberation theology, Christian Base Communities]
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