Guia de excursão pedológica do XXX Congresso Brasileiro de Ciência do Solo: solos da Zona da Mata de Pernambuco

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THE ADO METHOD FOR SOLVING ONE-DIMENSIONAL DEEP-PENETRATION TRANSPORT PROBLEMS

In this work, the Analytical Discrete Ordinate method (ADO method) is used to solve deep-penetration transport problems in one-dimensional Cartesian geometry, subject to isotropic and linear anisotropic scattering effects. The regime is considered permanent, the media are homogeneous, and the fluxes are caused by sources located on the boundaries of the domain. In addition, the energy fluctuations will be considered as not significant, characterizing the phenomena as monoenergetic problems. In order to validate the code, method and provide benchmark results, some test problems will be treated and results will be discussed. In particular, the ADO method generated fairly accurate results when compared to other methods based on SN approaches, at a relatively low computational cost

Divergência genética em feijão-caupi precoce, de porte ereto e crescimento determinado.

Foram estudados nove caracteres em 32 genótipos de feijão-caupi [Vigna unguiculata (L.) Walp.] com o objetivo de estimar a divergência genética através de análises multivariadas visando auxiliar a seleção de parentais. O ensaio foi conduzido no Campo Experimental da Embrapa - Centro de Pesquisa Agropecuária do Meio-Norte, em Teresina, PI, utilizando-se o delineamento experimental de blocos completos casualizados com seis repetições. Os dados foram colhidos nas duas fileiras centrais, subtraídas das duas primeiras covas nas duas extremidades. O genótipo IT 81D - 1069 foi o mais divergente, dentre todos, apresentando D2 máxima com 50% dos materiais avaliados. Cruzamentos entre os genótipos os genótipos dos grupos II e VIII podem ser bastante promissores e com alta probabilidade para obtenção de recombinantes desejáveis para porte, precocidade e rendimento de grãos

The Complex Topology of Chemical Plants

We show that flowsheets of oil refineries can be associated to complex network topologies that are scale-free, display small-world effect and possess hierarchical organization. The emergence of these properties from such man-made networks is explained as a consequence of the currently used principles for process design, which include heuristics as well as algorithmic techniques. We expect these results to be valid for chemical plants of different types and capacities.Comment: 7 pages, 5 figures and 1 tabl

Variation Between Individuals in Voluntary Intake and Herbage Intake of Grazing Dairy Cows

Herbage intake and milk yield of unsupplemented grazing dairy cows are highly variable between animals within a herd (Delaby et al., 2001). The objective of this experiment was to describe the relationship between the individual voluntary intake (VI) of dairy cows measured before turnout and their herbage intake at grazing, at two herbage allowances

Desempenho de cultivares e linhagens de algodoeiro herbáceo na microrregião de Chapadinha, MA, nos anos agrícolas de 2006/2007 e 2007/2008.

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Desempenho da cultura do algodoeiro herbáceo no Município de São Raimundo das Mangabeiras, MA, nos anos agrícolas de 2006/2007 e 2007/2008.

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