Choice of turbulence model for calculating gas dynamic CO2 lasers with selective thermal excitation

Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 163–168, Septebmar–October, 1990.     

The removability problem for functions with zero spherical means

We study the functions on the punctured n-dimensional sphere having zero integrals over all admissible “hemispheres.” We find a condition for the point to be a removable set for this class of functions and show that the condition cannot be dropped or substantially improved.     

On the Inversion of the Local Pompeiu Transformation

The inversion of the local Pompeiu transform for a triangle is constructed.     

Vibrationally nonequilibrium flow of a compressible gas in an axisymmetric channel in the presence of glow discharge

A laminar subsonic flow of CO-He-N₂ mixture in an axisymmetric channel with glow discharge is investigated. The actual flow diagram is modeled on the basis of a system of narrow-channel equations. The results of the calculations are compared with the experimental data. The possibility of applying a one-dimensional system of equations is analyzed.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 6, pp. 114–119, November–December, 1985.The authors wish to thank B. S. Aleksandrov for his help in the work.     

The extension problem for functions with zero weighted spherical means

We study functions on a sphere with a pricked point having zero integrals with a given weight over all admissible “hemispheres”. We find a condition under which the point is a removable set for such a class of functions. We show that this condition cannot be dropped or substantially weakened.     

Crystal Structure and Properties of [Co(NH3)6][PdCl4]Cl

Russian Journal of Coordination Chemistry - Complexes [Co(NH3)6][PdCl4]Cl (I) and [Co(NH3)6]2[PtCl4]3 (II) are synthesized and characterized. Complex I is isolated for the first time. The...     

Polyphenylene Gels

Polyphenylene gels are obtained for the first time by trimerization polycondensation of a number of diacetylaromatic compounds, and their structure is studied by IR spectroscopy and argon thermal desorption.