Analysis of the response of piezopolymer pressure gauges to a plane shock wave

We consider a phenomenological model for piezopolymer pressure gauges designed for registration of plane shock-wave pulses. We analyze the response of the gauges taking into account the physical phenomena observed in polarized polymer films upon action of high-intensity shock waves, the thermodynamic state of the material comprising the sensitive element, and the measurement circuit parameters. We compare the numerical calculations with experimental data for gauges made from polyvinylidene fluoride in the dynamic pressure range up to 16 GPa. We show that at such pressures, the electrical response is mainly determined by the change in the residual polarization of the piezofilm as a result of its compression.Institute of Chemical Physics at Chernogolovka. 142432 Chernogolovka. Translated from Fizika Goreniya i Vzryva, Vol. 30, No. 3, pp. 130–135, May–June 1994.     

Experience in developing ultrahigh capacity compressor stages

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 2, pp. 4–7, February, 1992.     

Development of equipment for heat treatment of carbon fibres

Conclusions 1. Adequate experience and knowledge has been accumulated in the Khimtekstil'mash NPO to make it possible to develop equipment for the manufacture of CF which conform to the contemporary world level. In recent years work on developing new equipment and improving existing equipment for the manufacture of CF have not received new development because of the lack of financing. One must also note the decrease in tempo of work on technological assurance, which is reflected in the technical level of equipment being developed.2. In connection with the high cost of work on developing new technologies and equipment for the manufacture of CF, these problems require solution at the state and in first-state level, since CF are materials not only for the present but also mainly for the future.Deceased.Khimtekstil'mash NPO (Chernigov). Translated from Khimicheskie Volokna, No. 5, pp. 33–35, September–October, 1993.     

Upgrade of Systems Controlling Pneumatic Transport of Glass Batch Materials

An upgraded system for controlling pneumatic transportation of glass batch materials produced by the Stromizmeritel' JSC is considered. Comparative analysis of various schemes of control over the process of filling the pneumatic-cell pump with material is provided.     

Effect of the particle size ratio on the conductivity of conductor-insulator powder composites: Numerical simulation

A theoretical method for determining the percolation limit and effective conductivity of composites based on polydisperse mixtures of insulator and conductor powders is proposed. The effect of the particle size ratio between the insulator and conductor on the percolation limit and effective conductivity is studied. Numerical simulation of the microstructure, effective properties, and percolation limit in composites is discussed. __________ Translated from Poroshkovaya Metallurgiya, Vol. 46, No. 1–2(453), pp. 31–40, 2007.