Chronique de l'imprimerie : gazette cosmopolite de la typographie et de la lithographie / propriétaire-gérant : Paul Schmidt

1880/08/01 (N8,VOL1)-1880/08/31.

Construção de uma cela de fluxo de longo caminho óptico para medidas espectrofotométricas

A simple and low-cost flow cell with 30 cm optical path for spectrophotometric measurements is described. It presents desirable characteristics such as low attenuation of the radiation beam and internal volume (75 µL) comparable to that of a 1-cm conventional cell (80 µL). Despite the increase in optical path, the effect on sample dispersion was also similar to that attained in the commercial cell. The performance of the cell was assessed by the determination of phosphate based on the molybdenum blue method, yielding a linear response range between 0.05 and 0.8 mg L-1 phosphorus (r=0.999). The increase in sensitivity (30.4-fold) in comparison with that obtained with a conventional 1-cm flow cell agreed with that estimated by the Lambert-Beer law.

Revue de synthèse : organe de la Fondation "Pour la science", Centre international de synthèse / direction : Henri Berr, Lucien Febvre, Paul Langevin, Abel Rey

1936/04 (T12,N1). Contient : Sciences de la nature et synthèse générale.

Revue de synthèse : organe de la Fondation "Pour la science", Centre international de synthèse / direction : Henri Berr, Lucien Febvre, Paul Langevin, Abel Rey

1935/10 (T10,N2). Contient : Sciences de la nature et synthèse générale.

Revue de synthèse : organe de la Fondation "Pour la science", Centre international de synthèse / direction : Henri Berr, Lucien Febvre, Paul Langevin, Abel Rey

1937/02 (T13,N1). Contient : Synthèse historique.

Técnica de bombeio e prova para medidas de absorção de estado excitado e de emissão estimulada, em materiais sólidos dopados com íons terras raras

Rare earth ion doped solid state materials are the most important active media of near-infrared and visible lasers and other photonic devices. In these ions, the occurrence of Excited State Absorptions (ESA), from long lived electronic levels, is commonplace. Since ESA can deeply affect the efficiencies of the rare earth emissions, evaluation of these transitions cross sections is of greatest importance in predicting the potential applications of a given material. In this paper a detailed description of the pump-probe technique for ESA measurements is presented, with a review of several examples of applications in Nd3+, Tm3+ and Er3+ doped materials.

Revue de synthèse : organe de la Fondation "Pour la science", Centre international de synthèse / direction : Henri Berr, Lucien Febvre, Paul Langevin, Abel Rey

1936/06 (T11,N2). Contient : Synthèse historique.

Revue de synthèse : organe de la Fondation "Pour la science", Centre international de synthèse / direction : Henri Berr, Lucien Febvre, Paul Langevin, Abel Rey

1939/10 (T18,N2)-1939/12. Contient : Synthèse historique et synthèse générale.

Revue de synthèse : organe de la Fondation "Pour la science", Centre international de synthèse / direction : Henri Berr, Lucien Febvre, Paul Langevin, Abel Rey

1933/04 (T6,N1). Contient : Sciences de la nature et synthèse générale.

Revue de synthèse : organe de la Fondation "Pour la science", Centre international de synthèse / direction : Henri Berr, Lucien Febvre, Paul Langevin, Abel Rey

1935/12 (T9,N3). Contient : Synthèse historique.