Frequency dependence of the electric strength of dielectrics in electrical breakdown

It was shown that the dependence of the electric strength of solid dielectrics on the frequency is determined by the corresponding dependence of the dielectric constant and it decreases sharply in the region of dispersion frequencies in elastic oscillations and on relaxation oscillators (in the condition ω₀ = 1/τ) in relaxation oscillations.     

Effect of a porous interlayer on the strengthening of low-carbon steel by contact explosion

We have studied the effect on strengthening and microstructural changes from a powder interlayer positioned between an explosive charge and a low-carbon steel surface. It has been established that the use of such interlayers leads to a greater increase in hardness and change in microstructure than comes about through direct contact of the charge with the surface being hardened. The effect increases as the acoustic impedance of the interlayer and the detonation characteristics of the explosive are increased.Novosibirsk. Translated from Fizika Goreniya i Vzryva, No. 2, pp. 130–137, March–April, 1991.     

Powdered material flow in the shock wave branching region

The foil-method and metallographic studies of powdered material particle orientation in specimens subjected to loading are used to show that upon regular reflection of colliding shock waves the flow in the region where they branch is homogeneous. A well expressed high-speed flow of material behind the Mach wave from exists for irregular reflections. In the shock wave branching region, two qualitatively different flowregimes are possible: without high-speed flow slippage, and with such slippage. Flow without slippage is found at shock wave amplitudes below some threshold value, dependent on the initial density of the powdered metal. A transition zone in the form of a viscous wake exists at the boundary of the high-speed and low-speed flows. A numerical solution of the model problem of mixing of two homogeneous flows of viscous liquid was carried out. By comparing calculation results to experiments which recorded characteristic viscous wake parameters, it was established that the effective viscosity of a shock-compressed copper powder with dispersion < 60 μm comprises ∼0.01 m²/sec, with the material remaining in the solid state at a density close to that of a monolithic specimen. Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090. Translated from Fizika Goreniya i Vzryva, Vol. 30, No. 5, pp. 118–122, September–October, 1994.     

Dielectric properties of a water molecule pinned on the surface of a solid body

A model of the polarization of a water molecule pinned on the surface of a solid body by oxygen and hydrogen ions is studied. As the dielectric constant increases, the spark-over voltage of solid dielectrics decreases. The character of the contaminated surface (alkaline or acid) at the operating locations must be taken into account when designing insulators. __________ Translated from Steklo i Keramika, No. 7, pp. 16–18, July, 2007.     

Relationship between thermal diffusion and conductivity for two-component crystalline structures

This paper gives a more accurate form of Reinhold's formula, which connects the concentration thermal diffusion effect with the transport number and electrical conductivity. The obtained formula correctly predicts the direction of thermal diffusion and the order of magnitude, but the results are a little too high.