Оn the mutual synchronization of two spin generators
Оn the mutual synchronization of two spin generators
Е.А. Кlivаdеnkо, М.S. Роlуаkоvа
The problem of the stability of generation of a spin oscillator with an inhomogeneously broadened line of the working material is examined for the example of two spin oscillators coupled by a common transverse magnetic field. The single-frequency regimes are investigated in detail for equal and unequal transverse and longitudinal relaxation times and nonzero phase angle in the feedback circuit. Particular attention is paid to the study of the nature of the beats outside the region of stable single-frequency operation.
Show AbstractMethod measurement of thermal diffusity of semitransparent materials of high temperatures
Method measurement of thermal diffusity of semitransparent materials of high temperatures
R.Р. Yurсhаk, А.А. Меgаkhеd
We propose a method of measuring the thermal diffusivity of partially transparent materials at high temperatures. The method is based on the application of the method of plane temperature waves for various thicknesses of the objects under study in the limit of an optically thin layer over a wide interval of heating frequencies. The method is tested by measuring the thermal diffusivity of high-quality fused quartz, which has an appreciable photon component of the heat transfer.
Show AbstractOperations of reciprocatioп апd inversion of complex physical values
Operations of reciprocatioп апd inversion of complex physical values
V.I. Shеstаkоv
The operations of reciprocation $V^{-1}$ and inverse $V^'$ of indefinite complex physical quantities are defined and investigated. It is noted that the operations of additions, inverse (harmonic) addition $V_{1}∙V_{2} =(V_{1}^' + V_{2}^')^'$, and inversion of indefinite complex quantities $V_{1}$ and $V_{2}$ are generalizations of the basic operations of Boolean algebra. At the end of the article, we examine the question of whether the inversion operation can actually (physically) be carried out for any complex (and in particular, real) physical quantities.
Show AbstractOn the role of vibrational excitations of а molecular system in the slow relaxation kinetic of charge on а semiconductor surfасе
On the role of vibrational excitations of а molecular system in the slow relaxation kinetic of charge on а semiconductor surfасе
V.F. Кisеlеv, S.N. Коzlоv
It is shown that the activation energy of the slow relaxation of charge in the field effect depends on the energy of the vibrational modes of absorbed molecules. The reason for the small capture cross sections of the slow electronic states is discussed. A capture model is proposed which explains the temperature dependence of the slow-relaxation kinetics in various gaseous units.
Show AbstractTemperature depeпdence of stationary radiolumiпescence in two levels system
Temperature depeпdence of stationary radiolumiпescence in two levels system
Т.S. Веssоnоvа, А.I. Sоbkо
Starting from the well known equations describing the kinetics of variations in the concentrations of free and localized charges in a crystal, we give an interpretation of the dependence of the intensity of stationary radioluminescence (RL) on temperature and on the concentration of chromium impurities in heavily doped ruby. Calculations are carried out for a band model containing one electronic and one hole level for arbitrary occupation of the traps. According to the results obtained, the experimentally observed independence of the intensity of stationary RL on the activator concentration can be explained in terms of the above model if it is assumed that there is no recombination. It is found that after a sudden drop in the stationary RL intensity in the R lines as the temperature is lowered, the level of luminescence in heavily doped ruby should remain unchanged during irradiation. This conclusion is in complete agreement with the available experimental data.
Show AbstractThe effect of moving irregularities on the motion of solid particles in a turbulent flow
The effect of moving irregularities on the motion of solid particles in a turbulent flow
N.А. Мikhауlоvа, S.G. Веlоshарkоvа
The statistical processing of a high-frequency motion picture has enabled us to establish that a flow interface consisting of individual discrete particles is a surface which varies in time and space with a deviation from its average position on both sides which is of the same order as the average height of the jumps of the solid particles. The take-off level of the solid particles in these jumps is with large probability higher than the landing level. The distribution of rms deviations of the vertical component of the velocity of the solid particles over the flow depth has two maxima (above the average interface and at the level of the interface). On the distribution curve for the rms deviations of the horizontal velocity component only the first maximum is clearly expressed.
Show AbstractSome of periodic perturbatioпs iп translatory-rotatory motioп of Мооп and Mercury
Some of periodic perturbatioпs iп translatory-rotatory motioп of Мооп and Mercury
Yu.V. Ваrkin
The periodic solutions of Poincare to the problem of planar translational- rotational motion of a solid body in the attractive field of a sphere are used to elucidate the periodic perturbations in the motion of the Sun-Mercury and Earth-Moon systems. The necessary conditions for the stability of the periodic solutions are obtained and analyzed, and the theoretical values of the parameters $δ = (B - C)/B - A)$, where A, B, and С are the principal central moments of inertia of the body, are found in accordance with these conditions. For the Moon, $δ_{L}=1,5$ and for Mercury, $δ_{M}=1,18$. The periodic solutions give theoretical values of the librations of the Moon and Mercury in the orbital planes (26.175" for the Moon and 10.098" for Mercury). The periodic perturbations of the semimajor axis of the lunar orbit due to the asphericity of the Moon have an amplitude of 1.669 m. The angular distance to the perigee undergoes oscillations of amplitude 0.076". Thus, for determining relativistic effects in the motion of the Moon it is important to take rigorously into account the connection between the translational and rotational motions of the Moon. The perturbations of the orbital motion of Mercury due to its asphericity are of insignificant size.
Show AbstractEquations of motion for the densities of classical dynamical variables in external fields
Equations of motion for the densities of classical dynamical variables in external fields
V.А. Кrаsnikоv
We obtain in compact form the equations of motion for the densities of the classical dynamical variables in a wide class of external fields. We also examine the linear approximation in the gradients of the external fields.
Show AbstractRemark to the field theory with quantiгed space-time
Remark to the field theory with quantiгed space-time
А.Е. Pukhоv
We examine the theory of quantized space-time developed by V. G. Kadyshevskii and co-workers. In this theory momentum space is a surface of constant curvature: $(π^0)^2 — (π^1)^2 - (π^2)^2 — (π^3)^2 + (π^4)^2 = 1$. Each value of the physical four-momentum $p^μ= π^μ$(μ = 0, 1, 2, 3) corresponds to two points in momentum space π and $π^*$, which differ by the ii sign of $π^4$. Using the conditions of translational invariance and the microcausality of the S matrix, we show that the retarded functions for n ≥ 2 satisfy the relation $R_{n}(π_{0}{1},..., π_{n})= -R_{n}(π_{0}^{*},π_{1},...,π_{n})$ which connects the values of the matrix elements in the region $π^{4}>0$ with the values of the matrix elements in the region $π^{4}<0$.
Show AbstractRays scattering iпdicatrix in flat-stratified medium with aпisometric irregularities
Rays scattering iпdicatrix in flat-stratified medium with aпisometric irregularities
S.М. Golynsky, N.Р. Ovchinnikova
We present a theoretical analysis of how the parameters of the scattering indicatrix of rays on exit from an isotropic refracting medium with ellipsoidal inhomogeneities depend on the azimuth and length of the airways, the magnetic inclination at the point of reflection, and the geometry of the scattering inhomogeneities.
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