382 research outputs found

    Binaries with total eclipses in the LMC: potential targets for spectroscopy

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    35 Eclipsing binaries presenting unambiguous total eclipses were selected from a subsample of the list of Wyrzykowski et al. (2003). The photometric elements are given for the I curve in DiA photometry, as well as approximate Teff and masses of the components. The interest of these systems is stressed in view of future spectroscopic observations.Comment: 4 pages, 1 figure; poster presented at the conference "Close binaries in the 21st Century: new opportunities and challenges", Syros, 27-30 June 200

    On the uncertainty relations and squeezed states for the quantum mechanics on a circle

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    The uncertainty relations for the position and momentum of a quantum particle on a circle are identified minimized by the corresponding coherent states. The sqeezed states in the case of the circular motion are introduced and discussed in the context of the uncertainty relations.Comment: 4 figure

    First observational evidence of a North Madagascar Undercurrent

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    <i>In situ</i> observations reveal a southeastward-directed North Madagascar Undercurrent (NMUC) below and opposite to the equatorward-directed North Madagascar Current (NMC) off Cape Amber, at the northern tip of Madagascar. Results show an undercurrent hugging the continental slope with its core at 460 m depth and velocities over 0.7 m s-1. Its volume transport is estimated to be 3.1–3.8 Sv, depending on the velocity extrapolation methods used to fill in the data gaps near the slope (no-slip and full-slip, respectively). The thermohaline characteristics show a saltier and warmer NMUC, compared to the surrounding offshore waters, transporting mainly South Indian Central Water. Also, strong horizontal gradients of density are found in the NMUC domain. An inshore cell of coastal downwelling due to Ekman Transport toward the coast is identified, which can explain, at least in part, the strong baroclinic pressure gradients as well as the NMUC development and possible persistence

    Resultados del ensayo del modulo de young y resistencia a la flexion de vigas laminadas de guadua angustifolia kunth

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    En esta publicación se presentan los resultados del comportamiento de la densidad, el módulo de Young y la resistencia a la flexión, de vigas laminadas de guadua Angustifolia Kunth con secciones tipo A, B, C, D, con el objeto de apropiar tecnología para su manufactura y producir información para el modelado y simulación de vigas laminadas. La metodología seguida para el ensayo de flexión en probetas grandes es la que propone la norma alemana para madera DIN-EN 408:2003 “Timber structures - Structural timber and glued laminated timber - Determination of some physical and mechanical properties”, y que se ha aplicado para la guadua por considerarse un bambú maderabl

    Quantum mechanics on a circle: Husimi phase space distributions and semiclassical coherent state propagators

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    We discuss some basic tools for an analysis of one-dimensionalquantum systems defined on a cyclic coordinate space. The basic features of the generalized coherent states, the complexifier coherent states are reviewed. These states are then used to define the corresponding (quasi)densities in phase space. The properties of these generalized Husimi distributions are discussed, in particular their zeros.Furthermore, the use of the complexifier coherent states for a semiclassical analysis is demonstrated by deriving a semiclassical coherent state propagator in phase space.Comment: 29 page

    Resultados del ensayo del modulo de young y resistencia a la flexion de vigas laminadas de guadua angustifolia kunth

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    En esta publicación se presentan los resultados del comportamiento de la densidad, el módulo de Young y la resistencia a la flexión, de vigas laminadas de guadua Angustifolia Kunth con secciones tipo A, B, C, D, con el objeto de apropiar tecnología para su manufactura y producir información para el modelado y simulación de vigas laminadas. La metodología seguida para el ensayo de flexión en probetas grandes es la que propone la norma alemana para madera DIN-EN 408:2003 “Timber structures - Structural timber and glued laminated timber - Determination of some physical and mechanical properties”, y que se ha aplicado para la guadua por considerarse un bambú maderabl

    Resultados del ensayo del modulo de young y resistencia a la flexion de vigas laminadas de guadua angustifolia kunth

    Get PDF
    En esta publicación se presentan los resultados del comportamiento de la densidad, el módulo de Young y la resistencia a la flexión, de vigas laminadas de guadua Angustifolia Kunth con secciones tipo A, B, C, D, con el objeto de apropiar tecnología para su manufactura y producir información para el modelado y simulación de vigas laminadas. La metodología seguida para el ensayo de flexión en probetas grandes es la que propone la norma alemana para madera DIN-EN 408:2003 “Timber structures - Structural timber and glued laminated timber - Determination of some physical and mechanical properties”, y que se ha aplicado para la guadua por considerarse un bambú maderabl

    Análise do potencial de invasão do capim-annoni-2 sobre áreas do bioma Pampa no município de Aceguá-RS.

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    Tendo em conta os problemas que traz a invasão de espécies e especialmente o capim-anonni no Bioma Pampa, o objetivo do trabalho é utilizar o modelo de distribuição de espécies GARP para identificar ás áreas potenciais de invasão por essa espécie no município de Aceguá-RS e a influência da malha viária como variável no modelo, obtendo as variáveis ambientais e topográficas de imagens de sensores remotos
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