8,584 research outputs found

    A simple deterministic self-organized critical system

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    We introduce a new continuous cellular automaton that presents self-organized criticality. It is one-dimensional, totally deterministic, without any kind of embedded randomness, not even in the initial conditions. This system is in the same universality class as the Oslo rice pile system, boundary driven interface depinning and the train model for earthquakes. Although the system is chaotic, in the thermodynamic limit chaos occurs only in a microscopic level.Comment: System slightly modified. New results on Liapunov exponents. Submitted for publication (8 pages

    Prospecção de espécies nativas de peixes como alternativas à indústria conserveira de pescado.

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    o objetivo deste estudo foi prospectar para a indústria conserveira de pescado espécies nativas de peixes, como alternativa para o processo de enlatamento

    Híbridos comerciais de milho tolerantes ao déficit hídrico.

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    A deficiência hídrica é uma das principais causas da redução da produtividade de grãos em cultivos de milho sob sequeiro. Nesse contexto, este trabalho teve como objetivo identificar híbridos comerciais de milho que apresentem tolerância ao déficit hídrico

    Caracterização de acessos do banco de germoplasma de mamona da Embrapa Algodão.

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    bitstream/CNPA/19645/1/COMTEC310.pd

    A pragmatic approach to the problem of the self-adjoint extension of Hamilton operators with the Aharonov-Bohm potential

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    We consider the problem of self-adjoint extension of Hamilton operators for charged quantum particles in the pure Aharonov-Bohm potential (infinitely thin solenoid). We present a pragmatic approach to the problem based on the orthogonalization of the radial solutions for different quantum numbers. Then we discuss a model of a scalar particle with a magnetic moment which allows to explain why the self-adjoint extension contains arbitrary parameters and give a physical interpretation.Comment: 8 pages, LaTeX, to appear in J. Phys.
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