Branching of equilibria of a system of micro/nanostrings at direct currents

Branching of equilibria of a system of three parallel conducting nano/microlayers, which is used to detect changes in the external and internal mechanical and electric characteristics (for example, conductivity, tension force, and gap between layers), has been investigated. A change in the physical parameters may cause asymmetric bending of the outer layers and deformation of the formerly neutral middle layer. By changing the current in one of the outer layers slowly, their initial symmetry (neutrality of the inner layer) can be restored and the change that occurred in the parameters can be determined.     

Stability of the Bernoulli–Euler Beam under the Action of a Moving Thermal Source

Doklady Physics - In this work, the problem of the propagation of a deflection wave in a Bernoulli–Euler beam during motion of the thermal source is solved, and the influence of the thermal...     

Oxidative destruction of polyolefins under stress. The action of ozone on polyethylene and polypropylene

Tensile stresses accelerate the rate of oxidation by ozone of films of polyolefins, high-density and low-density polyethylene, and isotactic polypropylene. Experiments have been performed on thin (up to 20 μm) uniaxially oriented films under constant stress σ, under conditions where the chemical kinetics rather than diffusion dominates. It is found that the oxidation rate is proportional to exp(γ′σ/RT) where γ′ is an empirical constant. The effects of unimolecular chain scission and the change of molecular polymer parameters under stress on this dependence are negligible. An analogy with the kinetics of oxidation of stressed cycloparaffins by ozone is noted. A mechanism is suggested to explain the accelerating effect of tensile deformations on chemical processes involving rehybridization of carbon atoms in the main chain from the sp³ to the sp² state. An ESR study with a stable nitroxyl radical probe revealed a change in the segmental mobility of polymer chains in the course of loading.     

General method for synthesis of 2-substituted 4, 5;1′,2′-glyco-Δ2-oxazolines

Conclusions We have developed a general method for the synthesis of 2-substituted 4,5;1,2-glyco-²-oxazolines, based on the reaction of acetylated 2-desoxy-2-acylaminoglycosyl chlorides with silver salts in the presence of collidine.Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 9, pp. 2094–2098, September, 1968.     

Dynamic Interaction of Longitudinal and Transverse Laser-Induced Oscillations of a Rod

Doklady Physics - The problem of the interaction of longitudinal and transverse vibrations of a rod under thermal actions using laser radiation is considered. Simultaneously taking into account the...