Preparation of Compounds of Epoxy Resins with Low-Molecular-Weight Carboxyl-containing Rubbers by Activating Mixing

A process was developed for preparing adhesives from a low-molecular-weight carboxyl-containing rubber and an epoxy resin with different oligomer ratios. The process involves the chemical reaction of the components under conditions of activating mixing.     

Interference acoustooptic technique for sound velocity measurements

The effect of an acoustic link between a buffer and a solid sample on the accuracy of the sound velocity measurements in the sample by interference techniques and, in particular, the interference acoustooptic technique [11] is considered. The phase difference between the waves going out of the sample and reflected from it, which is introduced by the acoustic link, is determined. It is demonstrated that, in the range of link thicknesses 0.1≤h≤1.0 µm, the correction to the sound velocity depends little on the link thickness. A procedure that allows one to determine this correction and the actual sound velocity in each specific case is proposed.     

Synthesis and properties of sterically hindered hydroxystyrlpyridines

A number of new sterically hindered hydroxystyrylpyridines were synthesized, and their antioxidative activity as a function of structure was studied. The antitumorigenic characteristics of three of the synthesized compounds are given.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1660–1664, December, 1971.The authors thank L. S. Vasil'eva, R. F. D'yachkovskaya, and N. A. Zakharova for their assistance in this research.     

Target fragments in collisions of 1.8 GeV/nucleon Fe nuclei with photoemulsion nuclei, and the cascade-evaporation model

Nuclear photographic emulsion is used to study the dependence of the characteristics of target-nucleus fragments on the masses and impact parameters of interacting nuclei. The data obtained are compared in all details with the calculation results made in terms of the Dubna version of the cascade-evaporation model (DCM).     

Interaction and spectra of the surface acoustoelectric fluctuations

The experimental results of the study of the surface acoustoelectric fluctuations dynamics in the amplifying circular structure piezoelectric-semiconductor are presented. The rule of the changes in auto-oscillation spectra with the growth of the drift velocity of the charge carrier was established. The influence of the monocromatic wave excited in the structure, upon the fluctuations evolution and the final stabilization was studied.