24,933 research outputs found

    Tecnologia para a produĆ§Ć£o de mudas certificadas de citros: tegumento e profundidade de semeadura do porta-enxerto Trifoliata.

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    Tecnologia para a produĆ§Ć£o de mudas certificadas de citros: Ć©poca de semeadura e tegumento do porta-enxerto Trifoliata.

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    LimĆ£o menos Ć”cido promete conquistar consumidores.

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    Normas e padrƵes para produĆ§Ć£o de mudas certificadas de citros em parceria com a Embrapa.

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    On X-ray-singularities in the f-electron spectral function of the Falicov-Kimball model

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    The f-electron spectral function of the Falicov-Kimball model is calculated within the dynamical mean-field theory using the numerical renormalization group method as the impurity solver. Both the Bethe lattice and the hypercubic lattice are considered at half filling. For small U we obtain a single-peaked f-electron spectral function, which --for zero temperature-- exhibits an algebraic (X-ray) singularity (āˆ£Ļ‰āˆ£āˆ’Ī±|\omega|^{-\alpha}) for Ļ‰ā†’0\omega \to 0. The characteristic exponent Ī±\alpha depends on the Coulomb (Hubbard) correlation U. This X-ray singularity cannot be observed when using alternative (Keldysh-based) many-body approaches. With increasing U, Ī±\alpha decreases and vanishes for sufficiently large U when the f-electron spectral function develops a gap and a two-peak structure (metal-insulator transition).Comment: 8 pages, 8 figures, revte

    ComparaĆ§Ć£o de custos de sistemas de adubaĆ§Ć£o para mudas de citros: fontes liberaĆ§Ć£o lenta x solĆŗveis.

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    Infra-estrutura e custo de produĆ§Ć£o de mudas certificadas de citros.

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    bitstream/item/32422/1/documento-118.pd

    Tecnologia para produĆ§Ć£o de mudas de citros: conservaĆ§Ć£o do poder germinativo de sementes de 'Trifoliata'.

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    Cultivares apirĆŖnicas de citros recomendadas para o Rio Grande do Sul.

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