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Estratégias de resolução de problemas lógicos de enunciado verbal por alunos de...

Dissertação de mestrado em Psicologia da Educação, Desenvolvimento e Aconselhamento, apresentada à Faculdade de Psicologia e Ciências da Educação da Universidade de Coimbra

Novel catalytic systems for the selective hydrogenation of a,B-unsaturated alde...

Tese de doutoramento. Engenharia Química e Biológica. Faculdade de Engenharia. Universidade do Porto. 2008

Os filhos dos "retornados": a experiência africana e a criação de memórias, pós...

Tese de mestrado, Geografia - População, Sociedade e Território, Universidade de Lisboa, Instituto de Geografia e Ordenamento do Território, 2011 ; Após mais de três décadas pautadas por um forte silêncio analítico no que diz respeito à presença portuguesa em África no período que constitui o “último capítulo” do império português, esta dissertação discute as memórias, pós memórias e representações que surgem ...

Empowerment on microfinance entrepreneurs: social, economic and institutional p...

Tanzania is one of the world’s poorest countries. Issues relating to poverty have largely been related with different forms of lack of power and, as such, this thesis presents itself with the goal of better understanding the relations between empowerment and poverty alleviation. It is assumed an empowerment model that, recognizes macroeconomic issues that underlie this problematic, but focuses on the concept of...

Análise econômica aplicada à decisão sobre alocação de água entre os usos irrig...

Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2009. ; Esta dissertação tem o intuito de propor procedimento que permita analisar a questão da alocação de água entre dois usos distintos - irrigação e produção de energia elétrica -, com base em métodos da análise econômica, buscando contribuir em processos de tomada de decisão na área de...

Cirurgia bariátrica e risco de suicídio

TiO2-carbon xerogel composites as supports in the preparation of Pt catalysts f...

In the last decades, considerable efforts have been devoted to the development of heterogeneous catalysts able to perform efficient selective hydrogenation of the carbonyl function in α,β-unsaturated aldehydes, to yield the corresponding unsaturated alcohols, which are important intermediates in organic synthesis of fine chemicals for several industries, such as flavor, fragrance and pharmaceutical. Unfortunate...

Liquid-phase hydrogenation of unsaturated aldehydes: enhancing selectivity of M...

The integration of nanotechnology into bioassays is having a great impact with the development of new nanostructures, nanodevices, nanomaterials or, in general, nanoparticles (NPs), such as nanoshells, nanowires, nanotubes and nanobarcodes, of a variety of shapes, sizes and composition [1-4]. These NPs, which exhibit new properties that are not shown by the bulk matter, are being considered as an alternative to...

Carbon aerogel supported platinum catalysts for selective hydrogenation of cinn...

This paper describes the preparation and characterization of 1% wt. Pt catalysts supported in carbon aerogels for the application in the liquid-phase selective hydrogenation of cinnamaldehyde. Carbon aerogel supports with different textures were activated with hydrogen peroxide and ammonium peroxydisulfate leading to large amounts of surface groups but keeping unchanged their textural properties. After introduc...

Carbon xerogel supported noble metal catalysts for fine chemical applications

Carbon xerogel, a mesoporous material, was produced by polycondensation of resorcinol and formaldehyde. A concentrated nitric acid solution was subsequently used to introduce high amounts of oxygenated groups on the surface. The carbon xerogel served as a support for Pt, Ir and Ru monometallic catalysts by using organometallic precursors. The catalysts were tested in the liquid-phase selective hydrogenation of ...