574 research outputs found

    Non-minimally coupled tachyon field with Noether symmetry under the Palatini approach

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    A model for a homogeneous, isotropic, flat Universe composed by dark energy and matter is investigated. Dark energy is considered to behave as a tachyon field, which is non-minimally coupled to gravity. The connection is treated as metric independent when varying the action, providing an extra term to the Lagrangian density. The self-interaction potential and coupling are naturally found by imposing a Noether symmetry to the system. We analyze the evolution of the density parameters and we compare the results obtained for the deceleration parameter, luminosity distance and Hubble parameter with those found in literature from observational data.Comment: 6 pages, 4 figures to be published in the AIP Conference Proceeding

    MacArthur and Frozen Chosin: An Analysis of the Press Coverage of Douglas MacArthur during the Battle of Chosin Reservoir

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    The Korean war included the rapid deterioration of the military career of one of America\u27s most decorated generals. During the cold Korean November of 1950, General Douglas MacArthur’s 8th Army and X Corps army units were in a race along the Korean coasts toward the border with China. Unlike previous endeavors, MacArthur’s “Home by Christmas” offensive ended in defeat, with the United Nation’s forces retreating back over the 38th Parallel after a Chinese counter attack. The Battle of Chosin Reservoir took place during this offensive and lasted from 27 November to 13 December, 1950. Most scholars agree that in retrospect MacArthur’s advance was overzealous, while some maintain that it was the only move, which would have brought the war to a swift and decisive conclusion. The goal of this paper was to investigate how the major press in the United States was writing about General MacArthur during the Battle of Chosin Reservoir. The press coverage during the Battle of Chosin Reservoir helped to ensure that MacArthur’s legacy included debate and polarization rather than his unanimous admiration as a war hero

    Cognitive and affective factors affecting task difficulty in efl reading

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    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e ExpressĂŁoO presente estudo tem por objetivo investigar, atravĂ©s de atividades, quatro diferentes tipos de operaçÔes mentais - Identificar, Deduzir, Definir e Reordenar, em trĂȘs categorias da taxionomia de Bloom, com o propĂłsito de: (1) descobrir a ordem de dificuldade destas operaçÔes no contexto do ensino de lĂ­ngua estrangeira, (2) verificar o que os alunos fazem enquanto trabalham em um exercĂ­cio, e (3) avaliar o esforço cognitivo destes alunos. Todos as unidades de exercĂ­cios eram de padrĂŁo semelhante, consistindo de trĂȘs elementos bĂĄsicos: o PrĂ©-exercĂ­cio feito por toda a classe sob a orientação da pesquisadora, o ExercĂ­cio I feito em duplas pelos participantes da pesquisa, e o ExercĂ­cio II feito pelos alunos em duplas. O PrĂ©- exercĂ­cio e o ExercĂ­cio I eram semelhantes, envolvendo a mesma situação, os mesmos fatos/tĂłpicos e o mesmo processo cognitivo. Os ExercĂ­cios II mantiveram a mesma estrutura, porĂ©m apresentaram um tĂłpico novo. O objetivo do PrĂ©-exercĂ­cio era providenciar um contexto onde os alunos pudessem trabalhar as dificuldades do ExercĂ­cio I previamente, e assim permitir Ă  pesquisadora reduzir o nĂ­vel de difficuldade dos exercĂ­cios e dar assistĂȘncia apropriada aos sujeitos para a execução do ExercĂ­cio I. Ao tĂ©rmino dos ExercĂ­cios I e II, foi passado um questionĂĄrio para obter a opiniĂŁo dos alunos sobre as dificuldades relacionadas a fatores tais como: VocabulĂĄrio, Familiaridade, PrĂ©-ExercĂ­cio e PortuguĂȘs, uma tentativa de separar as dificuldades lingĂŒĂ­sticas das dificuldades relacionadas Ă s operaçÔes mentais. Como nĂŁo foi possĂ­vel estabelecer nenhuma hierarquia quanto ao grau de dificuldade dos exercĂ­cios e foram poucas as correlaçÔes obtidas entre as variĂĄveis do questionĂĄrio, estes fatos sĂŁo, entĂŁo, atribuĂ­dos a trĂȘs principais fatores: a) vĂĄrias operaçÔes mentais ocorrendo ao mesmo tempo, b) fatores inerentes a cada exercĂ­cio e c) fatores afetivos
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