32,273 research outputs found

    Experimental characterization of the structural response of adobe arches

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    Earth was one of the first construction materials used by mankind and has been used as a building material since ancient times until the present days. Its qualities related to thermal comfort, low cost or simple construction techniques have contributed to such a long tradition throughout the world with several different architectural expressions, integrating the culture and history of each region. With the wide propagation of steel and concrete structures, there has been a general loss of the traditional knowledge in earth construction. This type of construction presents important structural fragilities and requires a special maintenance to preserve its qualities. In order to understand the structural behaviour of this type of structures, the associated construction methods and processes have to be considered. Aveiro University has been developing studies on adobe constructions, with research on the material mechanical characterization, experimental study of the structural behaviour of adobe masonry walls and, more recently, in the development of a detailed survey methodology for the characterization of buildings in Aveiro district. Integrated in these studies, arches with different geometries were built using adobe blocks and traditional construction methods. These arches were tested under different types of vertical loading (distributed symmetrical, distributed non-symmetrical and point load) until collapse. The experimental tests performed reproduce the typical loading conditions of these structures during construction and use. The tests conducted, the results obtained and the main conclusions attained are described in this paper

    Consangüinidade média, ate 1980, da população de suínos Duroc de pedigree do Brasil.

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    Intervalo entre gerações da população de suínos Large White de pedigree do Brasil.

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    Rebanhos geneticamente importantes para a raça de suínos Hampshire no Brasil.

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    bitstream/item/68286/1/DMeu-DiscoCNPSA-COM.-TEC.-49-82CNPSA-COM.-TEC.-49-82.pd

    Rebanhos geneticamente importantes para a raca Duroc no Brasil.

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    Rebanhos geneticamente importantes para a raca Large White no Brasil.

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    Desempenho em conversão alimentar de suínos Landrace e Large White e o potencial econômico de sua melhora genética.

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    Animais geneticamente importantes nas populações de pedigree das raças Landrace e Large White do Brasil.

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    Time dependent transformations in deformation quantization

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    We study the action of time dependent canonical and coordinate transformations in phase space quantum mechanics. We extend the covariant formulation of the theory by providing a formalism that is fully invariant under both standard and time dependent coordinate transformations. This result considerably enlarges the set of possible phase space representations of quantum mechanics and makes it possible to construct a causal representation for the distributional sector of Wigner quantum mechanics.Comment: 16 pages, to appear in the J. Math. Phy
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