1,777 research outputs found

    Grid services for the MAGIC experiment

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    Exploring signals from the outer space has become an observational science under fast expansion. On the basis of its advanced technology the MAGIC telescope is the natural building block for the first large scale ground based high energy gamma-ray observatory. The low energy threshold for gamma-rays together with different background sources leads to a considerable amount of data. The analysis will be done in different institutes spread over Europe. Therefore MAGIC offers the opportunity to use the Grid technology to setup a distributed computational and data intensive analysis system with the nowadays available technology. Benefits of Grid computing for the MAGIC telescope are presented.Comment: 5 pages, 1 figures, to be published in the Proceedings of the 6th International Symposium ''Frontiers of Fundamental and Computational Physics'' (FFP6), Udine (Italy), Sep. 26-29, 200

    Global Solution to the Three-Dimensional Incompressible Flow of Liquid Crystals

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    The equations for the three-dimensional incompressible flow of liquid crystals are considered in a smooth bounded domain. The existence and uniqueness of the global strong solution with small initial data are established. It is also proved that when the strong solution exists, all the global weak solutions constructed in [16] must be equal to the unique strong solution

    Landau-De Gennes theory of nematic liquid\ud crystals: the Oseen-Frank limit and beyond

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    We study global minimizers of a continuum Landau-De Gennes energy functional for nematic liquid crystals, in three-dimensional domains, subject to uniaxial boundary conditions. We analyze the physically relevant limit of small elastic constant and show that global minimizers converge strongly, in W 1,2 , to a global minimizer predicted by the Oseen-Frank theory for uniaxial nematic liquid crystals with constant order parameter. Moreover, the convergence is uniform in the interior of the domain, away from the singularities of the limiting Oseen-Frank global minimizer. We obtain results on the rate of convergence of the eigenvalues and the regularity of the eigenvectors of the Landau-De Gennes global minimizer.\ud \ud \ud We also study the interplay between biaxiality and uniaxiality in Landau-De Gennes global energy minimizers and obtain estimates for various related quantities such as the biaxiality parameter and the size of admissible strongly biaxial regions

    Calçadas como lugares de socialização: equidade urbana para pessoas com mobilidade reduzida

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    Resumo Diante da redução da equidade de usos e da garantia de acessibilidade em cidades, o objetivo geral desta pesquisa é avaliar as condições de calçadas para grupos de mobilidade reduzida, adotando trechos viários do bairro Centro de Curitiba, Paraná, como objetos de estudo. Com estrutura multimétodos, qualiquantitativa e exploratória, ela foi desenvolvida em quatro fases: caracterização local, leitura técnica, análise perceptual e avaliação integrada. Como respostas à pergunta investigativa sobre aproximações e distanciamentos entre prática e percepção desses espaços, os resultados evidenciam a impossibilidade de confirmação da hipótese orientativa de que o atendimento a princípios especializados permite melhores qualificações perceptivas, potencializadoras de identificação, pertencimento e apropriação de calçadas como lugares de socialização, não diagnosticadas neste caso

    Narrativas literárias e referências de tempo e espaço em paisagens representativas do imaginário coletivo

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    Diante da interpretação da cidade como imagem de ações da sociedadee considerando a necessidade de compreensão do imaginário humano para aconstrução de identidades individuais e grupais, o objetivo geral desta pesquisaconsiste em analisar o contexto em que a paisagem urbana tem sido referenciada no tempo e no espaço pela memória coletiva, adotando narrativas literárias de Manhattan (Nova York, Estados Unidos) como estudo de caso. Com base em postulados teóricos sobre os temas centrais de investigação, os procedimentos metodológicos foram fundamentados em um recorte amostral de 99 narrações de publicações no intervalo temporal de 196 anos, sistematizadas pela sua localização em mapa específico daquele distrito administrativo para identificação da frequência de citação por tipologia de elemento urbanístico (caminhos, limites, regiões, pontos nodais e marcos) e de ordenamento no tempo (horizontal: continuidade; vertical: especificidade). A análise dos resultados aponta, de forma intrínseca, para a legibilidade da regiãoestudada, com especial destaque para vias públicas e, de maneira genérica, para a necessidade de aprofundamento dos estudos para a devida estruturação de subsídios aos processos de planejamento de paisagens urbanas

    No measure for culture? Value in the new economy

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    This paper explores articulations of the value of investment in culture and the arts through a critical discourse analysis of policy documents, reports and academic commentary since 1997. It argues that in this period, discourses around the value of culture have moved from a focus on the direct economic contributions of the culture industries to their indirect economic benefits. These indirect benefits are discussed here under three main headings: creativity and innovation, employability, and social inclusion. These are in turn analysed in terms of three forms of capital: human, social and cultural. The paper concludes with an analysis of this discursive shift through the lens of autonomist Marxist concerns with the labour of social reproduction. It is our argument that, in contemporary policy discourses on culture and the arts, the government in the UK is increasingly concerned with the use of culture to form the social in the image of capital. As such, we must turn our attention beyond the walls of the factory in order to understand the contemporary capitalist production of value and resistance to it. </jats:p

    Energies of S^2-valued harmonic maps on polyhedra with tangent boundary conditions

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    A unit-vector field n:P \to S^2 on a convex polyhedron P \subset R^3 satisfies tangent boundary conditions if, on each face of P, n takes values tangent to that face. Tangent unit-vector fields are necessarily discontinuous at the vertices of P. We consider fields which are continuous elsewhere. We derive a lower bound E^-_P(h) for the infimum Dirichlet energy E^inf_P(h) for such tangent unit-vector fields of arbitrary homotopy type h. E^-_P(h) is expressed as a weighted sum of minimal connections, one for each sector of a natural partition of S^2 induced by P. For P a rectangular prism, we derive an upper bound for E^inf_P(h) whose ratio to the lower bound may be bounded independently of h. The problem is motivated by models of nematic liquid crystals in polyhedral geometries. Our results improve and extend several previous results.Comment: 42 pages, 2 figure
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