Effects of a central hole in a fuel tablet on the thermophysical characteristics of VVER fuel rods

Reactors Institute and Kurchatov Institute, Russian Scientific Center. Translated from Atomnaya énergiya, Vol. 80, No. 4, pp. 306–308, April, 1996.     

On the possibility of acoustic probing of gas wells

The possibility of probing the critical areas of gas wells using acoustic signals is analyzed. The results of investigations on the evolution of acoustic waves in cylindrical channels with permeable portions surrounded by a porous space are presented. The quantitative and qualitative features of the dynamics of waves as a function of the state of an inhomogeneous porous medium are established. Results showing that the state of the reservoir characteristics of rocks has a substantial influence on the evolution of acoustic signals are obtained. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 4, pp. 118–126, July–August, 2007.     

Nonlinear Delay of Excitation of Oscillations of a Magnetostriction Transducer in the Frequency Multiplication Mode

Journal of Communications Technology and Electronics - The problem of excitation of nonlinear forced oscillations of magnetization and elastic displacement in a ferrite plate of a magnetostriction...     

Conducting and reflecting properties of nanometer-width films of various metals

The conducting and reflecting properties of silver, gold, nickel, iron, chromium, and titanium films are investigated. It is shown that a low conductivity of films relative to bulk materials results from the amorphism of the films and the porosity of their substrates. Two different techniques for measuring the film conductivity are compared: a contact technique and a reflection technique. It is shown that the conductivity values obtained via the two techniques are of the same order of magnitude but may differ by a factor of up to 4.     

Trajectories of return surface magnetostatic waves in a ferrite-dielectric-metal structure magnetized by a nonuniform “ridge” field

Calculations are made of the trajectories of return surface magnetostatic waves (SMSWs) in a ferrite-dielectric-metal structure magnetized by a nonuniform “ridge” field. It is shown that there are four different types of trajectories. Conditions are determined for which the return SMSWs propagate in the direction opposite to the forward SMSWs and in the same direction as the forward SMSWs. Pis’ma Zh. Tekh. Fiz. 25, 61–66 (December 12, 1999)     

Linear and axially symmetric filtration models

Mathematical models are described for processes with time-dependent control functions, namely, pressure and discharge sources, as well as with a non-steady-state filtration area boundary. The possibility of the effect of viscosity with properties dependent on time as a consequence of the influence of temperature is taken into account. The limited nature of Darcy’s law, due to its incorrectness in axially symmetric cases, is shown. A new filtration law correct in axially symmetric processes is proposed, of which Darcy’s law is a special case.     

Vibration of tubes with flows

The effect of the inertia of the cross-section bend of tubes with flows on natural frequencies of their vibrations is analyzed. The consideration of the inertia leads to the compaction of the natural frequency spectrum in its high-frequency part. The laminar flow damps vibrations.     

Experimental investigation of the effect of the signal-to-noise ratio on the characteristics of forced capillary disintegration of a jet

Dependences of the signal-to-noise ratio in a jet in the case of forced capillary disintegration of the jet (FCDJ) on the excitation signal, the mean jet velocity, the velocity distribution in the jet, and the jet diameter are derived. It is shown that, for equal excitation amplitudes, the signal-to-noise ratio in the case of FCDJ depends on the jet diameter and the velocity profile. A relationship between the relative scatter of diameters of the droplets formed as a result of FCDJ and the signal-to-noise ratio is derived.Translated from Inzhenerno-fizicheskii Zhurnal, Vol. 4, pp. 544–550, April, 1991.