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Optimização eficiente do ganho espectral de amplificadores de Raman com bombage...

We report the use of the Genetic Algorithm (GA) in the optimization of a distributed Raman amplifier spectralgain. The used methodology is based on the direct integrationof Raman propagation equations making use of the transfermatrix method, which ensue into a considerable reduction ofthe computation time. Pointing out an on/off Raman gain of10 dB, we develop a technique based in a combination of theGA with the...

Effects of alkaline and acid solutions on glass/epoxy composites

Composite structures can be exposed to a range of corrosive environments during their in-service life, which causes degradation in terms of material properties. The effect of alkaline and acid solutions on the GRP mechanical properties can be found in open literature, but the studies presented are not sufficient to establish a full knowledge of this subject. In this paper the flexural properties and the impact ...

Acute Cerebellitis in Children: Regarding Different Etiologies

Acute cerebellitis is usually infectious, post-infectious or post-vaccination. Rarer causes include toxic ones. The clinical presentation is usually benign, however, severe cases with brainstem compression may present as coma. Regarding three pediatric clinical cases, the authors make a brief review on this entity, with particular emphasis on its causes and imaging findings. Case Reports: Three cases of pediatr...

Obtenção de nanocompósito de EVA/sílica e caracterização por ressonância magnét...

Nanocompósitos a base de poli(etileno-co-acetato de vinila) (EVA) e óxido de sílica (SiO2), com tamanho nanométrico da ordem de 40 nm, foram preparados via intercalação por solução, empregando clorofórmio como solvente. Os nanocompósitos foram caracterizados principalmente pela espectroscopia de ressonância magnética nuclear (RMN), empregando a análise dos núcleos de carbono-13 (matriz polimérica); silício-29 (...

Dispersion modeling a dynamic chromatic dispersion compensator based on Bragg g...

We report a method to realize tunable chromatic dispersion compensation based on chirped fiber Bragg gratings (CFBG). The changes on the CFBG dispersion are achieved by controlling a temperature gradient applied to the grating. A thermodynamic model is presented enabling us to simulate the temperature distribution along the grating lenght. Furthermore, a theoretical approach was de...

Biotechnological applications of selected macroalgae

IBBA Strategic Planning - Workshop III, Plant Biotechnology Ponta Delgada, 25 Janeiro, 2011.

Paper consumption at six higher education schools

Análise histológica em tecido epitelial sadio de ratos Wistar (in vivo) irradia...

CONTEXTUALIZAÇÃO: O Ultrassom (US) é um dos recursos físicos amplamente utilizado e pesquisado nos tratamentos de fisioterapia. Sabe-se que diante de uma escassa literatura sobre efeitos do US em tecidos sadios, muitos profissionais fisioterapeutas acabam realizando aplicações infundadas de métodos e parâmetros. OBJETIVO: Avaliar possíveis alterações histológicas e morfométricas do tecido sadio in vivo de ratos...

O Impacto dos Grupos de Ajuda Mútua no desenvolvimento da Esperança dos Pais de...

Endogenous iron as a photo-Fenton reaction catalyst for the degradation of Pah'...

Polycyclic aromatic hydrocarbon (PAH) components of diesel fuel are considered hazardous, due to their toxicity. We report the degradation of 16 PAHs using photo-Fenton and photo-Fenton-like processes in two different soil samples (S1 and S2) artificially contaminated with diesel oil. Experimental factorial designs were used to determine the most effective treatment conditions, with a view to achieving economic...