Polarization Electricity
Mostrando 1-3 de 3 artigos, teses e dissertações.
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1. Preparation of Pt, W e Os binary and tertiary alloys for the oxidation of methanol in low temperatures fuel cells / Preparação de ligas binárias e ternárias de Pt, W e Os para a oxidação de metanol em células a combustível de baixa temperatura
Modern society integrally depends on the production and consumption of energy for its activities like cooking, lighting and transportation and also for industrial processes. The increase in the demand for energy increases the levels of pollution, which has a direct negative effect in human health. Thus, it is imperative to search for new power sources which,
Publicado em: 2007
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2. Study of apodization of piezoeletric ceramics / Estudo da apodização de ceramicas piezoeletricas
The objective of this work was to optimize the process of apodization of piezoelectric ceramics disks, looking for the better relation between the insulating oil bath temperature and the smaIlest period of time through which the poling field must be applied. The apodization of the piezoelectric ceramic is performed to reduce the diffraction in the acoustic f
Publicado em: 2003
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3. Novo triodo corona e sua aplicação no estudo das propriedades elétricas do polímero pvdf. / New corona triode and application at the study of electrical properties of pvdf polymer.
This work describes a corona triode setup which allows charging thin dielectric films with a constant current and the simultaneous measurement of the sample surface potential. The charge current is kept constant by controlling the gride voltage, from which the sample potential is also derived. With the experimental setup we were able to obtain charging curre
Publicado em: 1990