Processes of combustion of aluminium particles in gas discharge

The regime of combustion of aluminium microparticles involving oxidant molecules is analyzed if heating of these particles leads to evaporation of aluminium atoms from the particle surface which form aluminium nanoclusters and they, in turn, partake in chemical reactions. It is shown that the chemical process cannot provide the particle heating for this regime, and it results from particle heating by an external field of gas discharge

Two-photon pumped random laser in nanocrystalline ZnO

International audienceThin film of ZnO nanoparticles with dimension of about 5–10 nm were fabricated by the pulsed laser ablation method. By using a femtosecond laser beam at 700 nm to pump micrometer-thick films the authors observed two-photon-induced lasing at 385 nm. Experimentally obtained dependence of the threshold on the excitation spot radius r0 is closer to (1/r_0^2) than to (1/r_0), thus suggesting efficiency of the feedback by scattering-random lasing. The experimental data on nonlinear transmission of the film at the wavelength of pumping are presented

Changing the chemical kinetic mechanism of ignition under the influence of SDBD in a rapid compression machine

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Experimental and numerical studies of nonequilibrium effects in framework of magnetohydrodynamic parachute concept

The magnetohydrodynamic (MHD) parachute effect is studied numerically for the reentry conditions. The effects of the extra ionization due to induced electric field U × B are taken into account. The efficiency of MHD interaction in terms of drag is estimated. For the flight conditions under consideration, the increase of total drag due to electromagnetic one is more than twice