574 research outputs found
Non-minimally coupled tachyon field with Noether symmetry under the Palatini approach
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
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 MacArthurâs 8th Army and X Corps army units were in a race along the Korean coasts toward the border with China. Unlike previous endeavors, MacArthurâs âHome by Christmasâ offensive ended in defeat, with the United Nationâs 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 MacArthurâs 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 MacArthurâs legacy included debate and polarization rather than his unanimous admiration as a war hero
Cognitive and affective factors affecting task difficulty in efl reading
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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