17,548 research outputs found

    A Amazônia e os desafios de sua ocupação.

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

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

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

    Sim, ainda temos analfabetos.

    Get PDF
    bitstream/item/103595/1/7255.pd

    Amazônia: laboratório do mundo.

    Get PDF
    bitstream/item/103588/1/7256.pd

    A hora e a vez da mandioca.

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

    O sapo e o meio ambiente.

    Get PDF
    bitstream/item/131997/1/Sapo.pd

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

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

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

    Full text link
    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

    Introdução e avaliação de cultivares de sorgo sacarino no cerrado do Território Federal do Amapá.

    Get PDF
    A EMBRAPA buscando alternativas economicas, com vistas ao aproveitamento de cerca de 9.295 km2 de solos sob vegetação de campos cerrados do Território Federal do Amapá, introduziu em 1982, e colocou a competir variedades e hibridos de sorgo sacarino.bitstream/item/64995/1/AP-1982-introducao-avaliacao-cultivares-sorgo-sacarino.pd
    corecore