A Amazônia e os desafios de sua ocupação.

bitstream/item/32655/1/AmazoniaDesafiosOcupacao.pdfDisponível também on-line

Sim, ainda temos analfabetos.

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Características da agricultura indígena e sua influência na produção familiar da Amazônia.

bitstream/item/63507/1/Oriental-Doc105.PD

Amazônia: laboratório do mundo.

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A hora e a vez da mandioca.

bitstream/item/49434/1/SP7254.pdfDisponível também on-line

O sapo e o meio ambiente.

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Adubação verde e plantio direto: alternativas de manejo agroecológico para a produção agrícola familiar sustentável.

bitstream/item/62424/1/DOCUMENTOS-212-Embrapa-A-Oriental.pd

The extended gaussian ensemble and metastabilities in the Blume-Capel model

The Blume-Capel model with infinite-range interactions presents analytical solutions in both canonical and microcanonical ensembles and therefore, its phase diagram is known in both ensembles. This model exhibits nonequivalent solutions and the microcanonical thermodynamical features present peculiar behaviors like nonconcave entropy, negative specific heat, and a jump in the thermodynamical temperature. Examples of nonequivalent ensembles are in general related to systems with long-range interactions that undergo canonical first-order phase transitions. Recently, the extended gaussian ensemble (EGE) solution was obtained for this model. The gaussian ensemble and its extended version can be considered as a regularization of the microcanonical ensemble. They are known to play the role of an interpolating ensemble between the microcanonical and the canonical ones. Here, we explicitly show how the microcanonical energy equilibrium states related to the metastable and unstable canonical solutions for the Blume-Capel model are recovered from EGE, which presents a concave "extended" entropy as a function of energy.Comment: 6 pages, 5 eps figures. Presented at the XI Latin American Workshop on Nonlinear Phenomena, October 05-09 (2009), B\'uzios (RJ), Brazil. To appear in JPC

Pecuária versus diversificação da produção nos projetos de assentamentos no Sudeste Paraense.

bitstream/item/28085/1/com.tec.97.pd