German Stepanovich Zhdanov (Obituary)

Abstract

Numerical instabilities hamper the computer simulation of axially symmetric, three-dimensional transient discharges from proceeding (Davies et al 1977).In the present paper, a method is presented in which suppression of the instabilities is attempted by avoiding numerical differentiation. The results when the present method is applied to simulation of a narrow, high-overvoltage discharge observed by Chalmers et al (1972) show that this method enables one to trace the cathode streamer reaching the cathode and the subsequent fronts propagating. The formation of the so-called radial constriction of the streamer is discussed.

Insulator–metal-type transitions induced by electron irradiation in gallium-doped PbTe-based alloys

“…Redistribution of the charge carriers between impurity-induced and radiation defect states and allowed bands makes it possible to vary the concentration of the free charge carriers and to realize metal-insulator-type transitions induced by electron irradiation. For example, it was shown that electron irradiation of the undoped p-Pb 1−x Sn x Te alloys causes a decrease in the free hole concentration and a transition to the insulating state due to the generation of electrically active n-and p-type defects and the flow of electrons from the radiation donor level to the valence band [9].…”