CLASSIFICAÇÃO DAS LÍNGUAS INDÍGENAS DO BRASIL

CLASSIFICAÇÃO DAS LÍNGUAS INDÍGENASDO BRASI

OS ESTUDOS DE PORTUGUÊS NO BRASIL

OS ESTUDOS DE PORTUGUÊS NO BRASI

Nomenclatura Gramatical

Nomenclatura Gramatica

AS IDÉIAS GRAMATICAIS DE JOÃO RIBEIRO

AS IDÉIAS GRAMATICAIS DE JOÃO RIBEIR

Out-Crossing Among Commercial Strains Of The Northern Quahog, Mercenaria Mercenaria: Survival, Growth And Implications For Selective Breeding

Because the accumulation of inbreeding within hatchery-propagated stocks of the hard clam, Mercenaria mercenaria (Linnaeus, 1758), could result in reduced growth and survival, we studied the potential for improving performance through out-crossing among existing hatchery strains. We produced all 10 possible out-crossed combinations among 5 strains of clams as well as all 5 pure parental strains simultaneously in the hatchery and measured their size at the time of metamorphosis (the spat stage) and at the end of a nursery period in mesh bags at a single field site (the seed stage). We then planted replicate plots of all fifteen strains at five field sites in Virginia, USA encompassing the range of salinity conditions used by commercial growers, and monitored growth and survival for two growing seasons. We found significant phenotypic differences among strains at the spat and seed stage, but different strains performed best at each stage. In the field we found significant site effects, strain effects and strain-by-site interactions, but there was no evidence of negative correlations in performance among sites indicating strong trade-offs that would be problematic for selective breeding. Three different linear contrasts designed to compare out-crossed and pure strains for each parental stock, test for nonadditive genetic effects within each pairing of different parental strains, and estimate the general combining ability of parental strains reveal a complex pattern. We found both inbreeding and out-breeding depression depending on the developmental stage of the clams and the parental strain examined. Within strain crosses generally produced larger spat but smaller seed. Out-crossed progeny were generally smaller at the spat stage than the average of their parental lines but larger at the seed stage. The two best performing parental strains had significant, positive, general combining abilities, whereas this measure was negative for the two worst parental strains. In the field, inbreeding depression was restricted to lines that showed poor pure strain performance, and these strains also showed poor general combining ability, whereas strains with good pure line performance showed out-breeding depression and good general combining ability. Only the poorest performing pure parental lines showed non-additive effects when we compared each out-crossed strain to the mean of its parental strains, suggesting that heterotic effects are unlikely to be useful for selective breeding. Finally, there were significant correlations between seed measurements and field performance indicating that it may be possible, in the context of selective breeding programs, to weed out inferior strains or families early in the life cycle

Carbon monoxide oxidation on Pt-Ru electrocatalysts supported on high surface area carbon

This find is registered at Portable Antiquities of the Netherlands with number PAN-0000787

Scalar geometry and masses in Calabi-Yau string models

We study the geometry of the scalar manifolds emerging in the no-scale sector of Kahler moduli and matter fields in generic Calabi-Yau string compactifications, and describe its implications on scalar masses. We consider both heterotic and orientifold models and compare their characteristics. We start from a general formula for the Kahler potential as a function of the topological compactification data and study the structure of the curvature tensor. We then determine the conditions for the space to be symmetric and show that whenever this is the case the heterotic and the orientifold models give the same scalar manifold. We finally study the structure of scalar masses in this type of geometries, assuming that a generic superpotential triggers spontaneous supersymmetry breaking. We show in particular that their behavior crucially depends on the parameters controlling the departure of the geometry from the coset situation. We first investigate the average sGoldstino mass in the hidden sector and its sign, and study the implications on vacuum metastability and the mass of the lightest scalar. We next examine the soft scalar masses in the visible sector and their flavor structure, and study the possibility of realizing a mild form of sequestering relying on a global symmetry.Comment: 36 pages, no figure

ESTUDO SOBRE A VIABILIDADE DA ALTERAÇÃO DOS PADRÕES CONSTRUTIVOS DOS ELETRODOS DE ATERRAMENTO VISANDO A UTILIZAÇÃO E FISCALIZAÇÃO EM PROJETOS

O presente artigo aborda um estudo sobre a viabilidade da alteração dos padrões construtivos dos eletrodos de aterramento visando sua utilização e fiscalização em projetos e principalmente no auxílio da fiscalização das montagens de padrões de entrada de energia elétrica. O estudo se iniciou devido a impossibilidade da fiscalização de hastes de aterramento instaladas em padrões de entrada por parte dos profissionais que fiscalizam e aprovam as montagens dos padrões de ligação solicitados pelos clientes. Infelizmente a montagem desses padrões nem sempre são realizadas por profissionais da área e por este motivo em alguns casos, a haste de aterramento é seccionada com o objetivo de facilitar a sua aplicação no solo, essa ação pode prejudicar de forma significativa o aterramento da instalação em questão, pois em casos que a resistência de aterramento fica menor nas camadas mais profundas do solo, o comprimento da haste exerce influência significativa nos valores de resistência de aterramento e seu comprimento inferior ao recomendado pode não oferecer uma resistência operativa satisfatória e segura a instalação elétrica a ser atendida. Outro fato relevante é o descumprimento das regulamentações para ligação de padrões de entrada definido pelas concessionárias de energia elétrica do país