Turbulence scale profile in mixing layers of flows along a solid surface
Turbulence scale profile in mixing layers of flows along a solid surface
B.I. Samolyubov
The turbulence scale distribution in a mixing layer was studied analytically for the purpose of developing methods for computing the energy and mass exchange at the boundaries of flows spreading along solid surfaces. The distributions of the velocity, scale of turbulence, and friction stress were obtained from the system of Reynolds equations. The effect of the cocurrent flow was taken into account. The mixing-length profile, determined analytically for the first time, was similar to the double turbulence microscale curve. Theoretical distributions are in agreement with the measured ones.
Show Abstract0n the question of analytic continuation of the external attractive potential of a celestial body inside the body
0n the question of analytic continuation of the external attractive potential of a celestial body inside the body
N.A. Chuikova
It is shown that the external potential of a celestial body of an arbitrary layered structure can be continued analytically inside the body to a certain finite depth depending on the dispersion characteristics of the body surface and density.
Show AbstractThe effect of charging of surface electron states on avalanche injection currents in the $Si—SiO_2$-metal system
The effect of charging of surface electron states on avalanche injection currents in the $Si—SiO_2$-metal system
S.N. Kozlov, V.V. Suprunov
The effect of charging of surface electron states in the $Si—SiO_2$-metal system on the transport of hot electrons from silicon to the oxide level during an avalanche breakdown in silicon has been studied. It is shown that the principal underlying mechanism of this effect is the "integral" change of the electric field produced in the space charge region of the semiconductor by charging the surface states. A new method of determination of the density of surface electron states is proposed. The method is based on measuring the dependence of the electron avalanche injection currents from the semiconductor to the oxide on the amplitude of depleting voltage pulses.
Show AbstractDistinctive features of waveguide properties of layered metal-dielectric microwave systems
Distinctive features of waveguide properties of layered metal-dielectric microwave systems
V.I. Kanavets, V.M. Pikunov, A.V. Fedorov, I.A. Chernyavskii
The behavior of eigenfields and eigenfrequencies for various operation regimes of layered metal-dielectric microwave systems, including the neighborhood of deflection of the dispersion characteristic, was studied by numerical modeling. The resulting data make it possible to analyze physical processes in waveguide transmission lines and decelerating systems of Cerenkov devices.
Show AbstractPossible effect of buoyancy on the spectrum of turbulent pulsations
Possible effect of buoyancy on the spectrum of turbulent pulsations
E.V. Pavlova
The results of experimental measurements of turbulence spectra are discussed. Some deviations from the $k^{-5/3}$ law are observed. A hypothesis of the effect of convective motion on the structure of the turbulent pulsation spectrum is suggested. It is shown that the presence of an additional energy source due to the convective processes results in the transition from the $k^{-5/3}$ law to the $k^{-2}$ law.
Show AbstractNonlinear reduction of measurements in problems of remote atmosphere probing
Nonlinear reduction of measurements in problems of remote atmosphere probing
T.V. Matveeva, Yu.P. Pyt'ev
Examples of typical remote atmosphere probing problems are considered to show that the majority of measurement interpretation problems reduce to calculating a function from an inexactly set argument. The results of a computational experiment lead to the conclusion that in the solution of applied problems it is advisable to apply nonlinear reduction methods.
Show AbstractAre the temperatures of the components of a homogeneous mixture of two gases in the state of thermodynamic equilibrium equal?
Are the temperatures of the components of a homogeneous mixture of two gases in the state of thermodynamic equilibrium equal?
Yu.M. Loskutov
It is shown that in the state of thermodynamic equilibrium of a two-component mixture of gases the mean kinetic energies of different kinds of molecules are unequal. Binary (nonmultiplicative) two-temperature distribution functions corresponding to the state of thermodynamic equilibrium have been found. In the general case, the equilibrium temperatures of mixture components turned out to depend on molecular masses and concentrations. The transition to a one-component gas leads to the commonly known results.
Show AbstractTwo-dimensional quantum solitons of the Weinberg-Salam model in a magnetic field
Two-dimensional quantum solitons of the Weinberg-Salam model in a magnetic field
V.R. Khalilov
The quantization of the Weinberg-Salam model has been carried out in the neighborhood of classical solutions to the field equations describing an electrically charged vector (W-boson) field interacting with a neutral scalar field (the Higgs field) in the presence of a superstrong magnetic field, in which the nonlinear effects are taken into account nonperturbatively. The energy spectrum of quantum particles (normal modes of the vector and scalar fields) in the "vacuum" and "kink" sectors has been found. It is shown that the discrete symmetry of the model broken in the two-dimensional approximation is not restored if the instanton contribution to the tunneling effect is taken into account in the quasi-classical approximation.
Show AbstractMathematical modeling of the resolution of a spectrometer designed to study the charge and isotope compositions of low energy cosmic rays
Mathematical modeling of the resolution of a spectrometer designed to study the charge and isotope compositions of low energy cosmic rays
S.E. Rozental'
Mathematical modeling of the process of detection of nuclei by a specially designed spectrometer is described and the main errors of the method are examined. The modeling yielded a dependence of the energy range in which the instrument is capable of separating the nuclei by mass $A$ on their charge $Z$. It is shown that the resolution of the spectrometer can be improved if about half of the nuclei detected are excluded from consideration. The results obtained are compared with accelerator experiment data.
Show AbstractEffects of nonexact description of bremsstrahlung spectrum on the reconstruction of photonuclear reaction cross sections
Effects of nonexact description of bremsstrahlung spectrum on the reconstruction of photonuclear reaction cross sections
G.R. Avetisyan, V.I. Makeev, Yu.P. Pytiev
The effects of nonexact description of the bremsstrahlung spectrum on the reconstruction of photonuclear reaction cross sections by the methods of mathematical simulation and measurement reduction are analyzed. It is shown that, within the attainable accuracies of photonuclear experiments, the inclusion of the influence of a realistic distribution of the atomic charge and of the contribution of terms of the order of $m_e$ to the amplitude of the bremsstrahlung formation process does not lead to considerable differences in reconstructed cross sections of photonuclear reactions.
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