On the dynamic interaction of the crystals in rocks at the first type phase transitions
On the dynamic interaction of the crystals in rocks at the first type phase transitions
M.V. Avdulоv
Motion equations for rock crystals pulsating in a highly viscous liquid are considered. It is shown that attractive forces which cause the system to contract arise befween crystals pulsating in phase.
Show AbstractAdmitance functions and thirdtime moments in nonlinear, nonequilibrium thermodynamics
Admitance functions and thirdtime moments in nonlinear, nonequilibrium thermodynamics
R.L. Stratonovich, A.V. Tоlstоpуatenко
A method of finding admittance functions from nonlinear relaxational equations with external forces is set forth which does no require the introduction of a small parameter. The method is used to find the quadratic triple - subscript admittance functions in an arbitrary multi-component case. The resulting functions are substituted in a nonquantum version of the formula used to express the quadratic fluctuation-dissipation theorem. As a result, the triple - time moment of the equilibrium thermal fluctuations are computed in an arbitrary multi - component case. A comparison is made with the results of Markov nonlinear nonequilibrium thermodynamics. In particular, it is finally proved that a relaxational equation with external forces may be restored, in a quadratic- linear approximation, in terms of arelaxational equation without forces.
Show AbstractSingle-circuit oscillator with additional unidirectional channel of delay feedback
Single-circuit oscillator with additional unidirectional channel of delay feedback
V.V. Abgarian, I.I. Minakova
The stationary regime equations for a single-circuit feedback oscillator with additional unidirectional delay feedback channel are obtained by means of the harmonic balance method. Stability conditions of the different single-frequency oscillation conditions are analyzed and relations between the amplitude and frequency characteristics of the system and the system parameters are obtained by means of numerical methods. Theoretical results are confirmed in a highly qualitative manner by an experiment performed using an electro-acoustic feedback oscillator model with ultrasonic delay line.
Show AbstractThe study of Vibrations of moving bodies by the coherent light scattered by them
The study of Vibrations of moving bodies by the coherent light scattered by them
V.S. Anchutkin, V.I. Shmal'hauzen
The penomenon of coherent emission by a moving coarse surface subjected to disturbances in the form of transverse vibrations is theoretically and experimentally investigated. Spectral patterns of the output signal from a photodetector are obtained for a model of an object in the form of a rotating duralumin disk that completes small angular wobbles. The technique and its equipment realization help in detecting the transverse vibrations of moving objects that diffusely scatter light, particularly the angular wobbles of moving parts. The experimental results are in good agreement with theoretical representations.
Show AbstractInteraction between a vortex line and uneven surface of type-II superconductor
Interaction between a vortex line and uneven surface of type-II superconductor
F.F. Ternovskii, L.N. Shehata
The interaction between a cylindrical (with arbitrary profile) superconductor boundary and a vortex filament parallel to it is investigated. It is shown that a marked drop in the Bean - Livingston potential barrier may occur at definite points of the profile of an uneven bound-ary (due to a local increase in the surface current density). Even in those cases in which the characteristic scale of the distortions is small by comparison with the depth of penetration, the superheating field of the Meisner state may drop down to values on the order of $H_cϰ^{-1/2}$.
Show AbstractGibbs's potential for a superconducting (type-II) quasi-closed system in the presence of a transport current
Gibbs's potential for a superconducting (type-II) quasi-closed system in the presence of a transport current
F.F. Ternovskii
An expression is found for the operation of a transport current source and a general definiti on of the Gibbs thermodynamic potential given for a superconductor of the second kind placed in an external magnetic field and carrying a transport current, based on successive application of the properties of the pairing potential phase.
Show AbstractParticles clouse packing influence on high dispersion $γ$-Fe$_2$O$_3$ magnetic properties
Particles clouse packing influence on high dispersion $γ$-Fe$_2$O$_3$ magnetic properties
L.V. Lasareva, A.V. Сheremushкina
The influence of the particle packing density on the degree of magnetization, coercive force and interaction between particles in highly dispersed γ-$F_eO_3$ is experimentally studied. Measurements are conducted at packing densities p = 0.02-0.7 in magnetic fields which greatly exceed the saturation field. It was found that all the magnetic characteristics studied in such systems are functions of the packing density.
Show AbstractSubharmonice oscillations excitations process in a tank circuit with small nonlinearity
Subharmonice oscillations excitations process in a tank circuit with small nonlinearity
A.N. Vachrameev
The parametric nature of nonstationary processes that arise when subharmonic oscillations are excited in a circuit with a small nonlinearitу is explained.
Show AbstractMagnetostatic oscillations spectrum of an ellipsoid with domain structure
Magnetostatic oscillations spectrum of an ellipsoid with domain structure
S.A. Vyzulin, S.A. Kirov, N.E. Syr'ev
A method is proposed for computing the magneto - static oscillation spectrum of an arbitrarily magnetized ferromagnetic ellipsoid both in the saturation region and the region of existence of the domain structure. The spectrum is computed for the case of a spheroidal sample of cubic ferrite monocrystal with negative first anisotropy constant magnetized perpendicular to the axis of rotation. In fields weaker than the saturation field, the computation is performed for the case of a two - phase plastic domain structure. An experimental study of the spectra of iron - yttrium garnet monocrystalline disks magnetized along [110] and cut in the plane (110) is performed in the range 400-2500 MHz. Good agreement is obtained over the entire range of field strengths studied, including in the domain structure, between the computed and experimental resonance oscillation frequencies in the (110), (220), (330), (440), (200), (210) arid (320) planes. However, a complete explanation of the low-frequency part of the experimental spectra could not be obtained, due to the inexactness of our approximation of the disk by a spheroid.
Show AbstractInvestigation of radiation defects distribution in NaCl by transmission electron microscopy
Investigation of radiation defects distribution in NaCl by transmission electron microscopy
Yu.V. Bykov, V.G. Babaev, M.B. Guseva
Data are presented on the study of the transverse slippage of argon ion- irradiated NaCI crystal (E-3 keV, current density 100 μA/$cm^{2}$, irradiated plane (100), slippage along (010) at a temperature of l80°C. Regions of defect localization in the slip plane are found by means of vacuum decoration radiation erosion of the profile of the near-surface layer of the crystal at different angles (40-90°) and different radiation doses ($10^{17}$-$10^{19}$ ion/$cm^{2}$). Based on the obtained data, it is concluded that the dimensions of the radiation - damaged regions found by means of the decoration method and the nature of the erosion of the ionirradiated near-surface layer are attributable to diffusion of radiation defects.
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