915 resultados para Massera, José Pedro


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Biodiversity continues to decline in the face of increasing anthropogenic pressures such as habitat destruction, exploitation, pollution and introduction of alien species. Existing global databases of species’ threat status or population time series are dominated by charismatic species. The collation of datasets with broad taxonomic and biogeographic extents, and that support computation of a range of biodiversity indicators, is necessary to enable better understanding of historical declines and to project – and avert – future declines. We describe and assess a new database of more than 1.6 million samples from 78 countries representing over 28,000 species, collated from existing spatial comparisons of local-scale biodiversity exposed to different intensities and types of anthropogenic pressures, from terrestrial sites around the world. The database contains measurements taken in 208 (of 814) ecoregions, 13 (of 14) biomes, 25 (of 35) biodiversity hotspots and 16 (of 17) megadiverse countries. The database contains more than 1% of the total number of all species described, and more than 1% of the described species within many taxonomic groups – including flowering plants, gymnosperms, birds, mammals, reptiles, amphibians, beetles, lepidopterans and hymenopterans. The dataset, which is still being added to, is therefore already considerably larger and more representative than those used by previous quantitative models of biodiversity trends and responses. The database is being assembled as part of the PREDICTS project (Projecting Responses of Ecological Diversity In Changing Terrestrial Systems – www.predicts.org.uk). We make site-level summary data available alongside this article. The full database will be publicly available in 2015.

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This paper deals with a finite element formulation based on the classical laminated plate theory, for active control of thin plate laminated structures with integrated piezoelectric layers, acting as sensors and actuators. The control is initialized through a previous optimization of the core of the laminated structure, in order to minimize the vibration amplitude. Also the optimization of the patches position is performed to maximize the piezoelectric actuator efficiency. The genetic algorithm is used for these purposes. The finite element model is a single layer triangular plate/shell element with 24 degrees of freedom for the generalized displacements, and one electrical potential degree of freedom for each piezoelectric element layer, which can be surface bonded or embedded on the laminate. To achieve a mechanism of active control of the structure dynamic response, a feedback control algorithm is used, coupling the sensor and active piezoelectric layers. To calculate the dynamic response of the laminated structures the Newmark method is considered. The model is applied in the solution of an illustrative case and the results are presented and discussed.

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Dissertação de mest., Teoria e Métodos da Arqueologia, Faculdade de Ciências Humanas e Sociais, Universidade do Algarve, 2008

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Dissertação de mest. , Psicologia, Especialização em Psicologia da Saúde, Faculdade de Ciências Humanas e Sociais, Universidade do Algarve, 2009

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Dissertação mest., Gerontologia Social, Universidade do Algarve, 2009

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Dissertação mest., Gestão Empresarial, Universidade do Algarve, 2008

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De entre los muchos repertorios de textos recogidos de la tradición oral hispánica que en los últimos años han ido publicándose, éste sobresale por un rasgo excepcional: su autor dedica igual espacio, aténcion, tiempo, rigor y esmero tanto al asunto puramente textual (los mayos) como as las cuestiones referidas al contexto folklórico (la fiesta) en el que los textos se actualizan.

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O estudio do romanceiro de Galicia vén merecendo unha atención especial tanto dentro como fóra do país [pénsese nas análises de A. Valenciano (1998) ou A. Requeixo (1996), entre outras].

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Dissertação de mest., História do Algarve, Faculdade de Ciências Humanas e Sociais, Univ. do Algarve, 2011

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O grande objectivo deste estudo foi contribuir para a melhoria do ensino da programação de computadores para aluno principiantes, através de um processo de observação da relação pedagógica estabelecida em sala de aula.

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This speech by Georgia Supreme Court judge Joseph Lumpkin aims to ignite a spirit of improvement and bring about its influence. This improvement is not necessarily in the interest of agriculture alone, but in the interest of the state as well.

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Trabalho de projeto de mestrado, Tecnologias e Metodologias em E-learning, Universidade de Lisboa, Instituto de Educação, Faculdade de Ciências, 2013

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Tese de doutoramento, Física, Universidade de Lisboa, Faculdade de Ciências, 2014

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Tese de doutoramento, História (História Moderna), Universidade de Lisboa, Faculdade de Letras, 2014