Composition at equilibrium, electrical and thermal conductivities, and dynamic viscosity coefficient are calculated for plasmas produced by vaporization of plastic materials (polymers) containing some percentage of carbon, hydrogen, oxygen, and nitrogen. Temperature and pressure ranges are 5000 – 30 000 K and 0.1–1 MPA. By indicating the role played by some particles on the characteristics of the discharge, this study has shown the influence of the nature of the material.[Journal translation]

This work presents a theoretical and experimental transient tri-dimensional study conducted for the determination of the bulk component of the minority carrier lifetime and the p-n junction recombination velocity of a bifacial polycrystalline silicon solar cell. The theoretical analysis is based on the columnar model of the grains in the polycrystalline silicon solar cell. The boundaries conditions are defined in order to use Green's function to solve the three-dimensional diffusion equation. This leads to a new expression of the transient photovoltage. The value of the constraint coefficients at interfaces of the grain are computed while those of the effective minority carrier lifetime eff  is extracted from the experimental curve of transient voltage. The bulk lifetime and the p-n junction recombination velocity are deduced and have been compared to those obtained from transient state by one-dimensional modelling of carrier's diffusion. This comparative study permitted us to show grain effects on the lifetime and consequently the inadequacy of one-dimensional modelling of carrier's diffusion in the polycrystalline silicon solar cells.

At atmospheric pressure, the values of density, enthalpy, specific heat, sonic velocity, viscosity, thermal and electrical conductivities have been calculated for plasmas of PE and PTFE in the temperature interval 5 000 K-30 000 K. In hypothesis of LTE, equilibrium composition is calculated using the classical equations of thermodynamic, and transport coefficients are calculated using the Chapman-Enskog method. The accuracy of results is discussed in connection with the selection of the collision integrals of the different species

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In the temperature range 5000-30000 K, thermodynamic properties of plasmas from vaporization of Calpha Hbeta Ogamma Ntheta insulators have been calculated in the pressure range from 1*105 Pa to 10*105 Pa. The method of calculation is indicated. The analysis shows that the respective proportions of carbon, hydrogen, oxygen and nitrogen atoms ( alpha , beta , gamma and theta ) in the organic molecule can notably modify the characteristics of the medium (plasma).