Memory effects in the problem of light propagation in a Universe with inhomogeneities

The Jacobi equation on a geodesic of a Riemannian manifold with random curvature describes the propagation of light in a Universe with inhomogeneities. A formula for the effective space curvature is derived within the framework of a model with a gradual loss of memory. This curvature is shown to be negative for any correlation radius. The results are compared with the well-known results obtained within the framework of models with piecewise constant random curvature and a small correlation radius of curvature.     

A study of the properties of a composite asphalt binder using liquid products of wood fast pyrolysis

The results of a study of the adhesive properties of a composite asphalt binder modified with pyrolytic lignin—a water-insoluble fraction of liquid products of fast pyrolysis of wood—are presented. It is shown that 10 wt % pyrolytic lignin increases the adhesive strength of the composite asphalt binder and the obtained samples of modified asphalt concrete correspond to the requirements of GOST (State Standard) 9128–84.     

Spectral-luminescence properties of a number of new heterocyclic compounds in solutions

Results of the spectral-luminescence investigation of solutions of new heterocyclic compounds are given. The relationship between the structure of the heterocyclic compounds and their spectral-luminescence characteristics is analyzed. The concentrations are established beginning with which the concentration quenching of luminescence occurs. Double luminescence manifested by certain compounds is related to their existence in the form of isomers. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 336–339, May–June, 2000.