Solar cell degradation under open circuit condition in out-doors-in desert region

AbstractThe reliability of solar cells is an important parameter in the design of photovoltaic systems and particularly for cost estimation. Solar cell degradation is the result of various operating conditions; temperature is one of most important factors. Installed PV modules in desert regions are subjected to various temperature changes with significant gradient leading to accelerated degradation. In the present work, we demonstrate the influence of open-circuit condition on the degradation of PV modules. The experiment is carried out in the desert region of ADRAR (southern Algeria) using two modules IJISEL of single-crystal silicon. A continuous monitoring allows analysis of both performances of modules for duration of 330days. The module in open-circuit condition reaches higher temperature means than the module in charging condition; therefore, it undergoes a higher degradation. By simulation, we found that the life of a PV module (whose power output is close to 50%) in a condition of an open-circuit in the desert region could be reduced to 4years, and that has a significant impact on economy

Radionescrose cerebrale a propos d\'une observation

No Abstract. Journal Tunisien d\'ORL et de chirurgie cervico-faciale Vol. 17 2006: pp. 55-5

LESIONS PAPULO-PUSTULEUSES PRURIGINEUSES DU VISAGE ASSOCIEES A UNE CONJONCTIVITE CHRONIQUE

We report a case of face localization of demodecidosis wich presented as papulopustular lesion associated to ocular manifestations (chronic blepharitis, chelazian). Demodecidose is induced by Demodex folliculorum. This parasit can induced various clinical pictures as folliculitis; blepharitis, rosaciformes dermatosis. The diagnosis was made by the presence of the parasit on direct examination of skin prelevement. Cyclines seems to be an interesting alternative to acaricides in the treatment of demodecidosis.Notre patient présente une démodécidose du visage sous forme de lésions papulo-pustuleuses associées à une atteinte oculaire à type de blépharite chronique et de chalazion de l’oeil gauche. La démodécidose est due à Demodex folliculorum. Ce parasite peut être associé à différents tableaux cliniques dont les folliculites, les dermites rosacéiformes ou les blépharites. Le diagnostic est conformé par la présence de parasite à l’examen direct. L’emploi de cyclines semble être une alternative intéressante aux acaricides de contact dans la démodécidose