45 research outputs found

    On the Non-relativistic Limit of Linear Wave Equations for Zero and Unity Spin Particles

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    The non-relativistic limit of the linear wave equation for zero and unity spin bosons of mass mm in the Duffin-Kemmer-Petiau representation is investigated by means of a unitary transformation, analogous to the Foldy-Wouthuysen canonical transformation for a relativistic electron. The interacting case is also analyzed, by considering a power series expansion of the transformed Hamiltonian, thus demonstrating that all features of particle dynamics can be recovered if corrections of order 1/m21/m^{2} are taken into account through a recursive iteration procedure.Comment: 10 page

    Modelos de composteira para compostagem de aves mortas.

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    bitstream/item/56384/1/publicacao-ct-57.pd

    Acícula de pinus, bagaço de cana, palha de milho, casca de amendoim, capim e maravalha como substratos na compostagem de carcaça de frango de corte.

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    bitstream/item/50882/1/circular-tecnica-56.pdfProjeto/Plano de Ação: 03.07.94.900-04

    Relativistic Quantum Thermodynamics of Ideal Gases in 2 Dimensions

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    In this work we study the behavior of relativistic ideal Bose and Fermi gases in two space dimensions. Making use of polylogarithm functions we derive a closed and unified expression for their densities. It is shown that both type of gases are essentially inequivalent, and only in the non-relativistic limit the spinless and equal mass Bose and Fermi gases are equivalent as known in the literature.Comment: 6 pages, 1 figur
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