967 research outputs found

    Ácido abscísico e o estresse abiótico.

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    Caracterização e análise da rentabilidade financeira de um consórcio agroflorestal desenvolvido em parceria com produtores do Reca.

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    O objetivo principal deste trabalho foi gerar coeficientes técnicos para implantação de um modelo de sistema agroflorestal adotado por agrossilvicultores do Projeto RECA (Reflorestamento Econômico Consorciado e Adensado). Foi realizada uma reunião com produtores que originou o modelo com quatro espécies (seringueira, açaí, café e banana). Procedeu-se uma análise financeira com fluxo de caixa para 18 anos, em que se verificou a viabilidade econômica do modelo de sistema agroflorestal

    Semiclassical properties and chaos degree for the quantum baker's map

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    We study the chaotic behaviour and the quantum-classical correspondence for the baker's map. Correspondence between quantum and classical expectation values is investigated and it is numerically shown that it is lost at the logarithmic timescale. The quantum chaos degree is computed and it is demonstrated that it describes the chaotic features of the model. The correspondence between classical and quantum chaos degrees is considered.Comment: 30 pages, 4 figures, accepted for publication in J. Math. Phy

    THGEM-based detectors for sampling elements in DHCAL: laboratory and beam evaluation

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    We report on the results of an extensive R&D program aimed at the evaluation of Thick-Gas Electron Multipliers (THGEM) as potential active elements for Digital Hadron Calorimetry (DHCAL). Results are presented on efficiency, pad multiplicity and discharge probability of a 10x10 cm2 prototype detector with 1 cm2 readout pads. The detector is comprised of single- or double-THGEM multipliers coupled to the pad electrode either directly or via a resistive anode. Investigations employing standard discrete electronics and the KPiX readout system have been carried out both under laboratory conditions and with muons and pions at the CERN RD51 test beam. For detectors having a charge-induction gap, it has been shown that even a ~6 mm thick single-THGEM detector reached detection efficiencies above 95%, with pad-hit multiplicity of 1.1-1.2 per event; discharge probabilities were of the order of 1e-6 - 1e-5 sparks/trigger, depending on the detector structure and gain. Preliminary beam tests with a WELL hole-structure, closed by a resistive anode, yielded discharge probabilities of <2e-6 for an efficiency of ~95%. Methods are presented to reduce charge-spread and pad multiplicity with resistive anodes. The new method showed good prospects for further evaluation of very thin THGEM-based detectors as potential active elements for DHCAL, with competitive performances, simplicity and robustness. Further developments are in course.Comment: 15 pages, 11 figures, MPGD2011 conference proceedin
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