The Effective Ionization of Air and Oxygen in a Near-Critical Electric Field at High Pressures

The effective ionization of air and oxygen at early stages of electric discharge development at medium and high pressures is analyzed. Ionization in an applied field with the participation of background electrons, electron sticking to and detachment from oxygen atoms and molecules, and recharging and conversion of negative ions is considered. The dependence of ion-molecular processes on external field is taken into account. The effective ionization value is shown to be different in constant and microwave fields. The effective air ionization values obtained in a microwave field are in agreement with the experimental data. It is shown that background electrons determine the possibility of effective ionization, whereas conversion processes determine the existence of a threshold E/N value, where E is the electric field strength and N is the density of neutral particles.     

Analogs of carbohydrate-metabolism coenzymes

Summary A new analog of uridine pyrophosphate glucosyl ester, namely 4-thiouridine pyrophosphate -D-glucopyranosyl ester, was synthesized.For preliminary communication see Biochim. Biophys. Acta59, 747 (1962).The authors, thank N. D. Gabriélyan and R. S. Kudryavtseva for carrying out the analyses.     

Influence of the accommodation coefficient on the water drop evaporation process in a radiation field

The process of water drop evaporation in a field of intense laser radiation is examined on the basis of the hydro-thermodynamics equations under the assumption of quasistationarity in the conditions in the surrounding medium and in the radius. The influence of the accommodation coefficient on heating of the drops on the magnitude of the surface jump in water vapor density and on the position of the upper bound of the convective evaporation region is analyzed. It is shown that the surface jump in the vapor does not alter the rate of convective evaporation of the drop in practice, but can result in substantially different time dependences of the radius of a diffusely evaporating drop as compared with those found without it. The solution obtained is compared with the solution of the problem of evaporation in a Stefan approximation.