11,533 research outputs found

    Cornops frenatum frenatum (Marschall) (Orthoptera: Acrididae): principal desfolhador em cultivos de heliconia spp. (Heliconiaceae) no Estado do Pará.

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    Unusual behaviours and Impurity Effects in the Noncentrosymmetric Superconductor CePt3Si

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    We report a study in which the effect of defects/impurities, growth process, off-stoichiometry, and presence of impurity phases on the superconducting properties of noncentrosymmetric CePt3Si is analysed by means of the temperature dependence of the magnetic penetration depth. We found that the linear low-temperature response of the penetration depth -indicative of line nodes in this material- is robust regarding sample quality, in contrast to what is observed in unconventional centrosymmetric superconductors with line nodes. We discuss evidence that the broadness of the superconducting transition may be intrinsic, though not implying the existence of a second superconducting transition. The superconducting transition temperature systematically occurs around 0.75 K in our measurements, in agreement with resistivity and ac magnetic susceptibility data but in conflict with specific heat, thermal conductivity and NMR data in which Tc is about 0.5 K. Random defects do not change the linear low-temperature dependence of the penetration depth in the heavy-fermion CePt3Si with line nodes, as they do in unconventional centrosymmetric superconductors with line nodes.Comment: To appear in New Journal of Physic

    Adaptabilidade e estabilidade de cultivares de feijoeiro comum na zona agreste do Nordeste brasileiro.

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    Nos anos agrícolas de 2005 e 2006, 12 variedades de feijoeiro comum (Phaseolus vulgaris L.) foram avaliadas em 18 ambientes da Zona Agreste do Nordeste brasileiro, em blocos aos acaso com três repetições, visando conhecer a adaptabilidade e a estabilidade de produção desses materiais. As áreas do agreste localizadas nos municípios de Paripiranga/BA, Simão Dias/SE e Frei Paulo/SE, mostraram-se mais propícias ao cultivo do feijoeiro comum. Os genótipos diferiram quanto à adaptabilidade e a estabilidade, destacando-se o BRS Marfim para ambientes favoráveis. As variedades BRS Valente, Supremo, Princesa e BRS Pontal evidenciaram adaptabilidade ampla (b0 > média geral e b = 1), consubstanciando-se em alternativas importantes para a exploração comercial nas diferentes áreas de cultivo do feijoeiro no Agreste nordestino. Dentre essas se destacou a Princesa, por se constituir no material ideal preconizado pelo modelo proposto (b0 > média geral; b = 1 e s2 d = 0).bitstream/CNPAF/26407/1/bp-26.pd
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