4,820 research outputs found

    Cosmic String Wakes in Scalar-Tensor Gravities

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    The formation and evolution of cosmic string wakes in the framework of a scalar-tensor gravity are investigated in this work. We consider a simple model in which cold dark matter flows past an ordinary string and we treat this motion in the Zel'dovich approximation. We make a comaprison between our results and previous results obtained in the context of General Relativity. We propose a mechanism in which the contribution of the scalar field to the evolution of the wakes may lead to a cosmological observation.Comment: Replaced version to be published in the Classical and Quantum Gravit

    Estratégias metodológicas para o diálogo participativo junto às comunidades ribeirinhas na Amazônia.

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    Seleção prévia das comunidades. Apresentação do projeto. Levantamentos. Abordagem junto às comunidades ribeirinhas. Análise dos dados

    Experiência em diagnóstico rural participativo o caso da comunidade do Lago do Ariauzinho, Município de Iranduba-AM.

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    Experiência em diagnóstico rural participativo o caso da comunidade do Lago do Ariauzinho, Município de Iranduba-AM

    Sistemas agroflorestais em assentamento rural no Estado do Amazonas: uma oportunidade para interação homem-meio ambiente.

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    O objetivo deste trabalho foi de verificar a percepção e adoção de SAF pelos agricultores das comunidades trabalhadas

    Diagnóstico rural participativo da comunidade de São Raimundo no Município de Maués.

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    A necessidade de realizar diagnósticos participativos está diretamente relacionada à necessidade de ter um espelho da comunidade de uma forma ágil, mostrando a organização e o funcionamento da mesma. Esse diagnóstico permitiu uma efetiva participação da equipe do projeto junto à comunidade como catalisador de um processo de pesquisa participativa, e seguiu as bases teóricas do diagnóstico participativo

    Massive scalar field near a cosmic string

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    The ζ\zeta function of a massive scalar field near a cosmic string is computed and then employed to find the vacuum fluctuation of the field. The vacuum expectation value of the energy-momentum tensor is also computed using a point-splitting approach. The obtained results could be useful also for the case of self-interacting scalar fields and for the finite-temperature Rindler space theory.Comment: 15 pages, standard LaTeX, no figures. Reference [14] correcte

    The effect of pre-maturation culture using phosphodiesterase type 3 inhibitor and insulin, transferrin and selenium on nuclear and cytoplasmic maturation of bovine oocytes.

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    This study aims to evaluate if a pre-maturation culture (PMC) using cilostamide as a meiotic inhibitor in combination with insulin, transferrin and selenium (ITS) for 8 or 24 h increases in vitro embryo production. To evaluate the effects of PMC on embryo development, cleavage rate, blastocyst rate, embryo size and total cell number were determined. When cilostamide (20 M) was used in PMC for 8 or 24 h, 98% of oocytes were maintained in germinal vesicles. Although the majority of oocytes resumed meiosis after meiotic arrest, the cleavage and blastocyst rates were lower than the control (P 0.05) to the control. The deleterious effect of 20 M cilostamide treatment for 24 h on a PMC was confirmed by lower cumulus cell viability, determined by trypan blue staining, in that group compared with the other groups. A lower concentration (10 M) and shorter exposure time (8 h) minimized that effect but did not improve embryo production. More studies should be performed to determine th
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