995 resultados para Gravataí (RS)
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"June 1992."
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Includes index.
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"February 1964."
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"September 1964."
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"6 September 1968."
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Includes index.
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"May 1992."
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Each issue has a distinctive title.
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Each issue has a distinctive title.
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A presente dissertação de Mestrado visa à investigação, observação e o estudo de ações de Educação para a Sustentabilidade (nos âmbitos da educação formal e não formal) que vêm sendo desenvolvidas, através de levantamento histórico e de um Estudo de Caso. O objetivo é refletir sobre aspectos das relações existentes entre ONGs socioambientalistas e escolas públicas e seu respectivo impacto nas localidades onde estão sendo implementadas, bem como, nos indivíduos nelas inseridos. Pretende-se analisar estas relações, as metodologias utilizadas, bem como, refletir sobre políticas públicas que apóiam estas ações.
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A novel laser electrodispersion (LE) technique was employed to deposit gold nanoparticles onto Si and SiOx surfaces. The LE technique combines laser ablation with cascade fission of liquid metal micro-drops, which results in the formation of nanoparticles upon rapid cooling. The shape and the size distribution of the Au nanoparticles prepared by LE depend on the nature of the support. Gold nanoparticles were also deposited in the channels of microreactors fabricated by wet etching of Si and used as SE(R)RS sensors. The influence of the nanoparticle surface density as well as of the nature of the substrate on the Raman response was studied. At an appropriate surface density of the deposited nanoparticles a significant enhancement of Raman signal was observed showing the possibility to create efficient SERS substrates. Application of microfluidic devices in surface enhanced Raman spectroscopy (SERS) in continuous-flow mode with sensor regeneration is described. © 2011 The Royal Society of Chemistry.