10,649 research outputs found

    Current Perspectives on Inclusive Education in the Czech Republic

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    This paper examines the academic literature describing the development of inclusive education programming within the Czech Republic after the Velvet Revolution. Interviews were conducted with special education professionals, who are researching potential benefits of inclusive education. Additionally, observations from an inclusive third grade classroom give further insight into how an inclusive classroom works. Despite some resistance, the Czech Republic is moving in the direction of inclusive education across the country

    The HELP inequality on trees

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    We establish analogues of Hardy and Littlewood's integro-differential equation for Schrödinger-type operators on metric and discrete trees, based on a generalised strong limit-point property of the graph Laplacian

    A VLT/FLAMES survey for massive binaries in Westerlund 1 IV. Wd1-5 – binary product and a pre-supernova companion for the magnetar CXOU J1647-45?

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    Context. The first soft gamma-ray repeater was discovered over three decades ago, and was subsequently identified as a magnetar, a class of highly magnetised neutron star. It has been hypothesised that these stars power some of the brightest supernovae known, and that they may form the central engines of some long duration gamma-ray bursts. However there is currently no consenus on the formation channel(s) of these objects.Aims. The presence of a magnetar in the starburst cluster Westerlund 1 implies a progenitor with a mass ≥40 M⊙, which favours its formation in a binary that was disrupted at supernova. To test this hypothesis we conducted a search for the putative pre-SN companion.Methods. This was accomplished via a radial velocity survey to identify high-velocity runaways, with subsequent non-LTE model atmosphere analysis of the resultant candidate, Wd1-5.Results. Wd1-5 closely resembles the primaries in the short-period binaries, Wd1-13 and 44, suggesting a similar evolutionary history, although it currently appears single. It is overluminous for its spectroscopic mass and we find evidence of He- and N-enrichement, O-depletion, and critically C-enrichment, a combination of properties that is difficult to explain under single star evolutionary paradigms. We infer a pre-SN history for Wd1-5 which supposes an initial close binary comprising two stars of comparable (~ 41 M⊙ + 35 M⊙) masses. Efficient mass transfer from the initially more massive component leads to the mass-gainer evolving more rapidly, initiating luminous blue variable/common envelope evolution. Reverse, wind-driven mass transfer during its subsequent WC Wolf-Rayet phase leads to the carbon pollution of Wd1-5, before a type Ibc supernova disrupts the binary system. Under the assumption of a physical association between Wd1-5 and J1647-45, the secondary is identified as the magnetar progenitor; its common envelope evolutionary phase prevents spin-down of its core prior to SN and the seed magnetic field for the magnetar forms either in this phase or during the earlier episode of mass transfer in which it was spun-up.Conclusions. Our results suggest that binarity is a key ingredient in the formation of at least a subset of magnetars by preventing spin-down via core-coupling and potentially generating a seed magnetic field. The apparent formation of a magnetar in a Type Ibc supernova is consistent with recent suggestions that superluminous Type Ibc supernovae are powered by the rapid spin-down of these objects

    COSWIN Logiciel de Maintenance des Equipements de Levage

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    La section 'Maintenance d'équipements de levage' assure l'entretien préventif et correctif d'un parc de 2800 appareils de levage et de manutention. Cette tâche est effectuée en collaboration avec une entreprise, spécialisée dans la maintenance industrielle. Pour faciliter la gestion des interventions, la section ST-HM-PR dispose depuis 1985 d'un système de gestion de maintenance assistée par ordinateur (GMAO). En 1996, cet ancien système a été remplacé par le logiciel 'COSWIN'. Celui-ci correspond aux besoins de la maintenance des appareils de levage. Sa disponibilité sous la plate-forme 'WINDOWS' rend l'utilisation de la GMAO facile et conviviale. 'COSWIN' travaillant en réseau, la base de données est commune pour tous les utilisateurs et mise à jour en temps réel. Depuis leurs locaux, situés au Technoparc de St. Genis, les opérateurs de l'entreprise contractante ont accès au logiciel par une ligne téléphonique. Le contrôle et le suivi des performances de l'entreprise se fait par l'analyse des différents ratios

    Resection Margins for Colorectal Metastases to The Liver: Do They Make A Difference?

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    Objective: The authors determined an appropriate surgical treatment for liver metastases from colorectal cancers. Clinicopathologic featuresof metastatic lesions of colorectal cancers were studied

    Økologisk hvidkløver - hvordan kan det lade sig gøre?

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    Økologisk hvidkløver - hvordan kan det lade sig gøre

    Electron-positron bremsstrahlung and pair creation in very high magnetic fields

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    Cross-sections for Rutherford scattering, Coulomb bremsstrahlung and pair creation, have been calculated at very high magnetic fields in order to investigate the photo-production of protons at the polar caps of pulsars whose spin is antiparallel with the polar magnetic flux density. The Landau-Pomeranchuk-Migdal effect at very high magnetic fields is included in a simple electron Green function.Comment: 10 pages; to be published in Monthly Notices of the Royal Astronomical Societ
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