Synthesis of Symmetrical Polyamide–Sulfonimides Based on Bis-saccharin Dicarboxylic Acid Dichlorides

Russian Journal of General Chemistry - Polycondensation of ethylene-bridged bis(saccharincarbonyl chlorides) with aliphatic diamines afforded soluble polyamide–sulfonimides. The effects of...     

Thermopower and electrochemical potentials of zirconium hydrides

The results of measurements of the thermopower and the electrochemical potential jumps of zirconium hydrides in relation to temperature (100–400°K) and concentration are given. The results are discussed on the assumption that the density of electronic states passes through a maximum as the hydrogen content of the hydrides varies. It is concluded that some of the hydrogen atoms are positively ionized when hydrogen is incorporated in the metal lattice.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 60–63, September, 1974.     

About the spectrum and the trace formula for the operator Bessel equation

We study the asymptotics of the distribution function and compute the regularized trace of a boundary value problem for the operator-differential equation with the boundary value depending on a spectral parameter.     

A trace formula of a boundary value problem for the operator Sturm-Liouville equation

We obtain a regularized trace formula for the operator Sturm-Liouville equation with a boundary condition depending on a spectral parameter.     

Analytical Solution of the Duffin–Kemmer–Petiau Equation for the Sum of Manning–Rosen and Yukawa Class Potentials

Russian Physics Journal - This paper presents an analytical bound-state solution to the Duffin–Kemmer–Petiau equation for the new putative combined Manning–Rosen and Yukawa class...     

Hollow-fiber glass-reinforced plastics with increased specific bending stiffness

It is shown that the use of hollow glass fibers makes possible a considerable increase in the specific bending stiffness of a glass-reinforced plastic as compared with solid-fiber material. At the same time, the thermophysical and dielectric properties are significantly improved.Mekhanika Polimerov, Vol. 2, No. 3, pp. 380–382, 1966     

The influence of the diameter of the glass fibers on the compressive strengths of glass-fiber-reinforced plastics

The authors investigate the stability of the five-layer model of a reinforced polymer. With the aid of a system of fourth-order differential-difference equations derived from the condition of equilibrium of the elements of the model and the compatibility of deformations at the interface, they derive an equation relating the compressive strength of an oriented glass-fiber-reinforced plastic to the diameter of the reinforcing fibers. They show experimentally that the strength of the glass-fiber-reinforced plastic increases with the fiber diameter; this relation is fairly well approximated by a straight line.All-Union Scientific-Research Institute of Glass-Fiber-Reinforced Plastics and Fiberglass, Moscow. Translated from Mekhanika Polimerov, No. 4, pp. 626–630, July–August, 1972.     

Mass-spectrometric investigation of ionophoric derivatives of benzo- and dibenzocrown ethers. 4. 4′-Acyl derivatives of benzo-15-crown-5 and benzo-18-crown-6

The mass spectra of 4-acyl derivatives of benzo-15-crown-5 and benzo-18-crown-6 were studied by the method of direct analysis of the daughter ions (DADI). It was established that the fragmentation of the M⁺ ions of the investigated compounds under electron impact proceeds via the scheme of the McLafferty rearrangement with the simultaneous elimination of ethylene oxide. The degree of occurrence of the McLafferty rearrangement increases with an increase in the length of the side chain.See [3] for communication 3.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 989–901, July, 1987.     

On the role of certain fundamental factors in the formation of high-strength reinforced structures

The existing conditions necessary for designing high-strength composite materials are analyzed, and experimental results that permit the evaluation of the role of the individual factors in the formation of a monolithic structure are presented.All-Union Scientific-Research Institute of Glass-Reinforced Plastics and Glass Fiber, Moscow Region. Translated from Mekhanika Polimerov, No. 4, pp. 743–746, July–August, 1973.