Ultrasonic Technique for Assessment of the Rim Tightness of Hydro Generator Rotor

At the hydroelectric unit No. 11 of the Nizhnekamsk hydroelectric power plant, the filling wedges of a rotor were investigated by ultrasound in the free st     

On colloid-chemical properties of some polymer composites

The influence of the vibrowave action on the properties of some disperse systems used in the textile industry has been considered. It has been noted that excitation of nonlinear oscillation in the audio band under resonant conditions leads to an increase in the degree of dispersion of distributed systems and an increase in their colloid stability. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, No. 1, pp. 133–138, January–February, 2006.     

Study of flame structure for mixed solid fuels based on ammonium perchlorate and polybutadiene rubber

Results are presented for a numerical study of the flame structure for mixed solid fuels (MSF) based on ammonium perchlorate (APC) and APC + polybutadiene rubber (PBR). The combustion process is modelled using formal kinetics detailed on the basis of experimental data for combustion of a layered system with pressures of 0.26 atm. A simplified set of equations obtained from a complete Navier-Stokes set with the limiting transtition M O is used in order to construct a solution. Flame structure is studied for pressures of 40 atm, and values of thermal flows into the k-phase are obtained.Novosibirsk. Translated from Fizika Goreniya i Vzryva, Vol. 28, No. 4, pp. 59–65, July–August, 1992.     

Superconductivity effects near the metal-insulator transition in granular indium films

The paper reports on an investigation of the electric resistance as a function of temperatureT, magnetic fieldH, and applied voltageV in granular indium films when approaching the metal-insulator transition (MIT) due to increased thickness of the oxide layers between granules. The dependences are shown to be governed atT5 K by competition of the hopping conductivity and the Josephson tunneling of electrons, sometimes giving rise to a resistance minimum inR(T) associated with superconductivity. It was also found that even when the intergranular Josephson tunneling is totally suppressed, transition of granules to the superconducting state influences essentially the dependencesR(T, H), changing the functional form ofR(T) and resulting in anomalously high negative magnetoresistance. This is shown to stem from the change of the character of activated electron tunneling as the granules become superconducting.     

Adaptive Control of Process Units at JSC OEMK Named after A. A. Ugarov Based on Neural Network for Tuning Controller Parameters

Metallurgist - The development and implementation of adaptive control systems, which are used to tune the parameters of PI-controllers of the metal pre-heating furnace for rolling and the water-air...     

Interaction of a shock wave with a cloud of particles

The present paper is devoted to experimental and theoretical investigation of shock-wave propagation in a mixture of a gas and solid particles with clearly defined boundaries of the two-phase region (cloud of particles). The effect of qualitative transformation of supersonic flow behind a shock wave in a cloud of particles is shown experimentally and substantiated theoretically for volume concentrations of the dispersed phase of 0.1–3%.Translated from Fizika Goreniya i Vzryva, Vol. 32, No. 2, pp. 86–99, March–April, 1996.     

Effect of Granule Size on the Structure of Nanoporous Ceramics Based on Organosilicon Polymer

Porosity in nanoporous ceramics produced by pyrolysis of organosilicon polymer at a temperature of 600°C was investigated using the BET method. Samples were molded from fractionated granules produced by single or double milling in a planetary mill of a polymer previously solidified and heat-treated at 200°C. Specific surface area depending on nanopores sharply decreases after the granules reach a size over 250 m in single milling and over 1000 m in double milling. An explanation for these facts is given in the context of synergism.     

Coherent precession of spin in Fermi liquids

The equations of spin dynamics of a normal Fermi liquid in a nonuniform magnetic field have a special symmetry. Because of this symmetry the equations have steady-state solutions which describe coherently precessing structures. The structures consist of two domains. In one of the domains the magnetization is parallel and in the other it is antiparallel to the magnetic field. Within the domain wall the magnetization can rotate by any odd multiple of . The possibility of realization of analogous structures in the other physical systems is discussed.