Levantamento de reconhecimento de solos e avaliação do potencial de terras para irrigação do município de Simão Dias, Sergipe.

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Gravitational Collapse of Self-Similar and Shear-free Fluid with Heat Flow

A class of solutions to Einstein field equations is studied, which represents gravitational collapse of thick spherical shells made of self-similar and shear-free fluid with heat flow. It is shown that such shells satisfy all the energy conditions, and the corresponding collapse always forms naked singularities.Comment: 34 pages, 9 figures, late

Perturbed Self-Similar Massless Scalar Field in the Spacetimes with Circular Symmetry in 2+1 Gravity

We present in this work the study of the linear perturbations of the 2+1-dimensional circularly symmetric solution, obtained in a previous work, with kinematic self-similarity of the second kind. We have obtained an exact solution for the perturbation equations and the possible perturbation modes. We have shown that the background solution is a stable solution.Comment: no figure

Economicidade do cultivo da soca de arroz irrigado em várzeas tropicais.

A análise econômica baseou-se nas produtividades médias obitdas no cultivo principal e na soca, no sistema de produção do arroz irrigado empregado pelos produtores, considerando-se os custos variáveis, as receitas e as relações de benefício/custo, conforme planilha eletrônica utilizada para cálculos na Embrapa Arroz e Feijão, com os preços atualizados no mês de abril de 2003.bitstream/CNPAF/21523/1/comt_59.pd