14 resultados para Fundamental dimensions

em Universidade do Minho


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Tese de Doutoramento em Ciências Jurídicas (área de especialização em Ciências Jurídicas Públicas).

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The consequences that arose from the ‘global economy’ have been significant in Portuguese children’s lives and we believe it is fundamental to reflect on the ongoing structuring of childhood through this global culture/ideology and the concrete implications that they have. It is also important to understand how childhood is constructed and experienced, as well as to consider the impacts of political economic conditions on children’s lives and in childhood in general, taking into account the effects brought on by public policies. The aim of this paper is to reflect on the ways through which the economic crisis affecting the general Portuguese population has impacted children in particular and promoted discrimination and a lack of opportunities in childhood. We will focus on two dimensions: first, on general data about the ongoing policies that have been reducing social rights, increasing poverty rates and threatening basic rights such as educational and health rights, to show their impact on children´s lives. Second, we will discuss some data collected with children throughout different research projects in order to characterize the meanings and impacts of the crisis in their lives from their points of view

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Dissertação de mestrado em Engenharia Humana

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Dissertação de mestrado integrado em Engenharia Eletrónica Industrial e de Computadores

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Dissertação de mestrado integrado em Engenharia e Gestão de Sistemas de Informação

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Tese de Doutoramento em Ciências da Educação (área de especilização em Desenvolvimento Curricular).

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When combined at particular molar fractions, sugars, aminoacids or organic acids a present a high melting point depression, becoming liquids at room temperature. These are called Natural Deep Eutectic Solvents – NADES and are envisaged to play a major role on the chemical engineering processes of the future. Nonetheless, there is a significant lack of knowledge of its fundamental and basic properties, which is hindering their industrial applications. For this reason it is important to extend the knowledge on these systems, boosting their application development [1]. In this work, we have developed and characterized NADES based on choline chloride, organic acids, amino acids and sugars. Their density, thermal behavior, conductivity and polarity were assessed for different compositions. The conductivity was measured from 0 to 40 °C and the temperature effect was well described by the Vogel-Fulcher-Tammann equation. The morphological characterization of the crystallizable materials was done by polarized optical microscopy that provided also evidence of homogeneity/phase separation. Additionally, the rheological and thermodynamic properties of the NADES and the effect of water content were also studied. The results show these systems have Newtonian behavior and present significant viscosity decrease with temperature and water content, due to increase on the molecular mobility. The anhydrous systems present viscosities that range from higher than 1000Pa.s at 20°C to less than 1Pa.s at 70°C. DSC characterization confirms that for water content as high as 1:1:1 molar ratio, the mixture retains its single phase behavior. The results obtained demonstrate that the NADES properties can be finely tunned by careful selection of its constituents. NADES present the necessary properties for use as extraction solvents. They can be prepared from inexpensive raw materials and tailored for the selective extraction of target molecules. The data produced in this work is hereafter importance for the selection of the most promising candidates avoiding a time consuming and expensive trial and error phase providing also data for the development of models able to predict their properties and the mechanisms that allow the formation of the deep eutectic mixtures.

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In this chapter, the fundamental ingredients related to formulation of the equations of motion for multibody systems are described. In particular, aspects such as degrees of freedom, types of coordinates, basic kinematics joints and types of analysis in multibody systems are briefly characterized. Illustrative examples of application are also presented to better clarify the fundamental issues for spatial rigid multibody systems, which are of crucial importance in the formulation development of mathematical models of mechanical systems, as well as its computational implementation.

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Dissertação de mestrado em Direito das Crianças, Família e Sucessões

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Dissertação de mestrado em Ciências da Educação (área de especialização em Educação de Adultos)

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Dissertação de mestrado em Educação Especial (área de especialização em Dificuldades de Aprendizagem Específicas)

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Dissertação de mestrado em Educação Especial (área de especialização em Dificuldades de Aprendizagem Específicas)

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Este estudo analisa a importância dos processos de avaliação cognitiva na experiência de ansiedade e de burnout bem como a importância da avaliação cognitiva e da ansiedade na predição do burnout. Participaram nesta investigação 711 atletas (89 do sexo feminino e 622 do sexo masculino), com idades compreendidas entre os 12 e os 19 anos (M = 14.77; DP = 1.86). Os participantes responderam a um protocolo de avaliação composto por três instrumentos, além de um questionário demográfico: Escala de Ansiedade no Desporto-2; Escala de Avaliação Cognitiva e Questionário de Burnout para Atletas. Os resultados demonstraram que a avaliação cognitiva primária desempenha um papel fundamental na experiência de ansiedade e de burnout, dado que a perceção de ameaça correspondeu a maiores níveis de ansiedade e burnout e a perceção de desafio correspondeu a menores níveis nestas variáveis. Além disso, verificou-se que as dimensões da avaliação cognitiva primária, em conjunto com as dimensões da ansiedade, foram variáveis preditoras do burnout. Em suma, os resultados evidenciaram a importância da avaliação cognitiva no estudo dos estados emocionais dos atletas, sugerindo a continuação de investigações futuras neste domínio.

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Dissertação de mestrado em Ciências da Educação (área de especialização em Tecnologia Educativa)