Literatura científica selecionada sobre o tema "Mesure simultanée du potentiel et du courant"
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Artigos de revistas sobre o assunto "Mesure simultanée du potentiel et du courant"
Malavoi, J., e Y. Souchon. "Hydrologie et dynamique hydroécologique des cours d'eau". Revue des sciences de l'eau 5, n.º 2 (12 de abril de 2005): 247–61. http://dx.doi.org/10.7202/705131ar.
Texto completo da fonteFayolle, Jacky, e Françoise Milewski. "L'investissement fuit le risque". Revue de l'OFCE 53, n.º 2 (1 de junho de 1995): 5–106. http://dx.doi.org/10.3917/reof.p1995.53n1.0005.
Texto completo da fonteMasson, Dominique. "ESCALA GEOGRÁFICA E TRANSNACIONALIZAÇÃO: análise sobre movimentos sociais e de mulheres". Caderno CRH 19, n.º 48 (10 de maio de 2007). http://dx.doi.org/10.9771/ccrh.v19i48.18866.
Texto completo da fonteTeses / dissertações sobre o assunto "Mesure simultanée du potentiel et du courant"
Kaliszczak, Magdalena. "Polarisation chimique de l'interface liquide-liquide vers une cocristallisation contrôlée". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0332.
Texto completo da fonteControlled formation of cocrystals is an important objective in drug development. This work used the electrochemistry at interface between two immiscible liquids (ITIES) to control the formation of cocrystals. In the first part, the electrochemical behaviour of caffeine was investigated by the means of cyclic voltammetry (CV) and alternating current voltammetry (ACV). The caffeine is the hydrophilic cation thus, it transferred at highly positive potential. Transfer of caffeine (Caff) was verified at various pH and the pH 2 was chosen to be the most optimal for the cocrystals formation. The control experiment proved that 1-hydroxy-2-naphthoic (1H2N) did not transfer at ITIES. ACV provided the information about the influence of the aqueous and organic phase composition. Values have changed when CaffH+ alone, 1H2N alone and both 1H2N and CaffH+ were present in the aqueous phase. These suggest that these two molecules are interfacially active. In the third part the simultaneous measurement of potential (∆E) and current (I) variations at the ITIES, which were polarised using tetraalkylammonium cations as a common ion was reported. Various concentration ratios of tetramethyl-, tetraethyl-, and tetrapropylammonium were dissolved in both phases. Such biphasic systems were then used to verify that the interfacial potential difference measured fit the theoretical calculations. This experimental set-up was next used to probe the interfacial cocrystallisation process of hydrophilic and cationic CaffH+ with lipophilic 1H2N. The presence of caffeine in the aqueous phase led to higher current values, caused by interfacial charge transfer. Analysis of the electrochemical current noise showed a clear difference between cells in which cocrystals are formed and those in which cocrystallisation is hindered, either by a negative potential or by a change in pH. The EN method is a powerful tool to follow the changes occurring at ITIES in common ion experiments by simultaneous measurement of potential and current. In the last part, cocrystals were formed on the ITIES according to the conditions chosen by the design of experiments (DoE) method. Various factors were tested: electrolytes in the aqueous phase, various solvents and salts applying positive potential. The XRD analysis showed the conditions to obtain almost pure Phase I and almost pure phase II. Study of simultaneous ∆E and I and the interfacial tension proved that the applied potential influences the kinetics of the cocrystallization process. DoE method indicated organic salt as the factor having an active impact on cocrystallization at ITIES
Graf, Emmanuelle. "Agression biliaire et secrétion acide gastrique : intéret de la mesure simultanée de la différence de potentiel et du ph gastriques". Nantes, 1988. http://www.theses.fr/1988NANT133M.
Texto completo da fonteJacob, Dominique R. "Principe de la mesure simultanée de distance et d'épaisseur de dépôts métalliques par capteur à courants de Foucault : conception et réalisation d'un dispositif". Paris 11, 1988. http://www.theses.fr/1988PA112148.
Texto completo da fonteThis thesis presents the design of a system, using an eddy current sensor, for measuring the thickness of metallic deposits on metallic sheets. The sensor, allows the thickness measurement without an accurate position of sensor and the sheet. A model which take account of the distribution of the flux in the space and of the physical properties (resistivity, permeability) of the materials has been developed. This model has been experimentally validated. It allows to take account of the temperature and to calculate the dimensions of the sensor. An application concerning the thickness measurement of zinc deposit on a steel sheet is exposed. The informations of the sensor are digitalised and processed by a microcomputer for calculating simultaneously the distance, between the sensor and the covered sheet, and the thickness of the deposit