11,685 research outputs found

    Use of water quality index to evaluate the influence of anthropogenic contamination on groundwater chemistry of a shallow aquifer, Loures valley, Lisbon, Portugal

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    A significant industrial development, associated with a demographic expansion, occurred during the last decades of the XX century, in Loures valley, a region located in the vicinities of Lisbon, the capital city of Portugal. This was accompanied with an important modification of land use and occupation patterns, mainly the decrease of the agricultural land. One of the main consequences was the deterioration of the groundwater chemistry observed in the shallow aquifer associated to Trancão river, a subsidiary of Tagus river. Factorial Correspondence Analysis has been used to build a water quality index, for evaluating the impact of the anthropogenic factors on groundwater of the shallow aquifer. By analysing the kriged maps of the values of the index, it was possible to identify the areas more sensitive to the anthropogenic impact

    Symbolic Sequences and Tsallis Entropy

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    We address this work to investigate symbolic sequences with long-range correlations by using computational simulation. We analyze sequences with two, three and four symbols that could be repeated ll times, with the probability distribution p(l)1/lμp(l)\propto 1/ l^{\mu}. For these sequences, we verified that the usual entropy increases more slowly when the symbols are correlated and the Tsallis entropy exhibits, for a suitable choice of qq, a linear behavior. We also study the chain as a random walk-like process and observe a nonusual diffusive behavior depending on the values of the parameter μ\mu.Comment: Published in the Brazilian Journal of Physic

    Desempenho produtivo de oito clones de cajueiro anão precoce cultivados no semi-árido piauiense sob regime de sequeiro.

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    bitstream/CPAMN-2009-09/17156/1/CT145.pd

    Avaliação de clones de cajueiro-anão-precoce no cerrado do sul maranhense.

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    Avaliação de Clones de Cajueiro-Anão-Precoce no Cerrado do Sul Maranhense; Introdução; Desenvolvimento; Biometria; Produtividade; Características do fruto; Aptidão comercial; Distribuição média mensal da produção de castanha; Características agroeconômicas; Comercialização da produção; Comparativos econômicos.bitstream/item/37219/1/Doc145.pd

    Comportamento produtivo de oito clones de cajueiro-anão-precoce em cultivo de terceiro ano sob regime de sequeiro.

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    bitstream/item/38615/1/CT158.pd

    Avaliação de clones de cajueiro-anão-precoce em cultivo de terceiro ano no semi-árido piauiense.

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    O objetivo deste trabalho foi avaliar o desempenho produtivo de oito clones de cajueiro anão precoce no semi-árido piauiense, visando identificar os mais promissores para a produção de castanha e caju para mesa..

    Desempenho econômico de clones de cajueiro-anão-precoce em cultivo de quarto ano de produção no município de Picos, PI.

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    bitstream/CPAMN-2009-09/20171/1/CT183.pd
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