894 research outputs found

    Os santos médicos Cosme e Damião nos ‘flos sanctorum’ quinhentistas

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    Neste artigo, o autor trata da legenda dos santos Cosme e Damião, padroeiros dos médicos e sua ilustração xilográfica em Legendários de Santos portugueses do século XVI. Nela se refere um caso de uma operação cirúrgica a um cancro em que se recorre ao transplante de uma perna

    Os santos médicos Cosme e Damião nos ‘flos sanctorum’ quinhentistas

    Get PDF
    Neste artigo, o autor trata da legenda dos santos Cosme e Damião, padroeiros dos médicos e sua ilustração xilográfica em Legendários de Santos portugueses do século XVI. Nela se refere um caso de uma operação cirúrgica a um cancro em que se recorre ao transplante de uma perna

    Characteristics productive and meat quality of broiler chickens fed finisher diet without vitamin-mineral supplement or limestone and dicalcium phosphate and submitted to heat stress pre-slaughter

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    Search mechanisms that can reduce the cost of production of poultry is an important factor in the poultry industry. Thus the objective of this study was to evaluate the removal of vitamin and mineral supplement or limestone and dicalcium phosphate feed during the finishing phase, further of the broilers chickens to heat stress pre-slaughter. Hybro male broiler (n=108) aged 42 days old were evaluated until 49 days old to evaluate the performance, carcass and cuts yield, blood biochemistry and meat quality. The results showed that the removal of vitamin and mineral supplement or limestone and dicalcium phosphate feed during the finishing phase did not impair the performance, carcass characteristics and meat quality, as well as showing a possible mechanism to reduce production costs. While heat stress pre-slaughter provided a poor meat quality of poultry.3323371337

    Evapotranspiração e coeficientes de cultivo da beterraba orgânica sob cobertura morta de leguminosa e gramínea.

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    As práticas agrícolas que maximizam a produtividade e o uso da água são de vital importância para a agricultura. Assim, foram testados três tipos de manejo do solo com objetivo de determinar a evapotranspiração (ETc) e os coeficientes de cultivo (kc) da beterraba. Os tipos de manejo foram a utilização de coberturas mortas vegetais, denominadas capim cameroon (Pennisetum purpureum), gliricídia (Gliricidia sepium) e solo sem cobertura morta em área experimental do SIPA (Sistema Integrado de Produção Orgânica) localizado em Seropédica, Brasil. A lâmina de irrigação foi estimada com base no balanço de água no solo, cujo monitoramento foi realizado com a técnica da TDR. As ETc acumuladas para a cultura da beterraba foram 59,41; 55,31 e 119,62 mm, respectivamente, para capim cameroon, gliricídia e solo sem cobertura morta. A evapotranspiração de referência (ETo) foi obtida por meio do modelo de Penamn-Monteith. Os valores médios de kc obtidos para as fases inicial, média e final de desenvolvimento foram de 0,39; 0,42 e 1,02; 0,79; 0,76 e 1,18; e 0,56; 0,61 e 0,84, respectivamente, para capim cameroon, gliricídia e solo sem cobertura morta. O uso da cobertura do solo com gramínea ou leguminosa minimizou de forma expressiva a demanda hídrica da cultura da beterraba (Beta vulgaris)

    Regularity Properties and Pathologies of Position-Space Renormalization-Group Transformations

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    We reconsider the conceptual foundations of the renormalization-group (RG) formalism, and prove some rigorous theorems on the regularity properties and possible pathologies of the RG map. Regarding regularity, we show that the RG map, defined on a suitable space of interactions (= formal Hamiltonians), is always single-valued and Lipschitz continuous on its domain of definition. This rules out a recently proposed scenario for the RG description of first-order phase transitions. On the pathological side, we make rigorous some arguments of Griffiths, Pearce and Israel, and prove in several cases that the renormalized measure is not a Gibbs measure for any reasonable interaction. This means that the RG map is ill-defined, and that the conventional RG description of first-order phase transitions is not universally valid. For decimation or Kadanoff transformations applied to the Ising model in dimension d≥3d \ge 3, these pathologies occur in a full neighborhood {β>β0, ∣h∣<ϵ(β)}\{ \beta > \beta_0 ,\, |h| < \epsilon(\beta) \} of the low-temperature part of the first-order phase-transition surface. For block-averaging transformations applied to the Ising model in dimension d≥2d \ge 2, the pathologies occur at low temperatures for arbitrary magnetic-field strength. Pathologies may also occur in the critical region for Ising models in dimension d≥4d \ge 4. We discuss in detail the distinction between Gibbsian and non-Gibbsian measures, and give a rather complete catalogue of the known examples. Finally, we discuss the heuristic and numerical evidence on RG pathologies in the light of our rigorous theorems.Comment: 273 pages including 14 figures, Postscript, See also ftp.scri.fsu.edu:hep-lat/papers/9210/9210032.ps.
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