The design and synthesis of high-efficiency materials to convert solar to electrical energy is an increasingly important research field. Within the photovoltaic technologies, crystalline Si have an 80% share while the remaining 20% are mostly thin film solar cells based on Cu(In,Ga)(S,Se)2 (CIGSSe) and CdTe [1,2]. However,the cost, the abundance and the environmental impact of the elemental components cannot be...
In this work, microwave hybrid sintering at 1300 and 1350 °C was carried out for densification of La9.33Si2Ge4O26 mechanically alloyed powder with apatite structure. The pellets sintered at these two temperatures present the same structure (apatite) with relative densities of 92 and 96%, respectively. Mechanical analysis performed on sintered materials revealed the following results: hardness of 7.1 and 8.0 GPa...
The study of exhaled breath condensate (EBC) obtained by cooling exhaled air under conditions of spontaneous breathing is considered one of the areas with higher interest in respiratory health research. The use of EBC for elemental determination in occupational exposure requires a standard methodological procedure to implement its practice in occupational studies. EBC is an inhomogeneous sample with organic and...
Solid oxide fuel cells (SOFCs) are devices that allow direct conversion of chemical to electrical energy through an electrochemical reaction in a cleaner and more efficient way than conventional processes (eg. gas turbines). They are characterized by the use of a solid oxide material as the electrolyte. Yttria-stabilised zirconia (YSZ) has traditionally been used in SOFCs electrolytes at temperatures in the ra...
Dissertação apresentada para obtenção do grau de Mestre em Engenharia Electrotecnica e de Computadores, na Faculdade de Engenharia da Universidade do Porto, sob a orientação do Prof. Doutor João Bernardo de Sena Esteves Falcão e Cunha
Mestrado em Saúde, Medicina e Sociedade ; A opção pelo parto em casa, em Portugal, reveste-se de interesse sociológico pela complexidade das relações entre saberes, poderes e percepções do risco que são postas em jogo. A aproximação ao tema implicou o aprofundamento teórico de questões que se revelaram imprescindíveis para a compreensão dos fenómenos sociais que se criam e se reconfiguram em torno do parto em ...
The design and synthesis of high-efficiency materials to convert solar to electrical energy is an increasingly important research field. Within the photovoltaic technologies, crystalline Si have an 80% share while the remaining 20% are mostly thin film solar cells based on Cu(In,Ga)(S,Se)2 (CIGSSe) and CdTe [1,2].
Estágio realizado na Oxisol e orientado pelo Eng.º Fernando Ferraz ; Tese de mestrado integrado. Engenharia Mecânica. Faculdade de Engenharia. Universidade do Porto. 2009
Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Sociais, Departamento de Sociologia, 2002. ; A Sociologia consolidou-se como disciplina obrigatória no currículo das escolas públicas do Distrito Federal, a partir da Reforma do Ensino Médio desencadeada pelo Ministério da Educação, em 1998. Conforme as diretrizes dessa Reforma, cabe a essa disciplina contribuir para que educando desenvol...
Intestinal microbiota may influence inflammation in the host. The aim of the present study was to explore the role of modulation of intestinal microbiota in the outcome in the Helicobacter pylori (Hp) gastric inflammation. Twenty five C57BL/6 male mice were separated in three groups: Control group (CG) n = 5 Infected group (IG) n = 10 and Synbiotic 2000TM (SG) n = 10. CG received PBS by gavage; IG and SG were i...
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