The maximum power and efficiency of a polyphase ferromagnetic frequency multiplier are calculated in the square hysteresis loop approximation.
Show AbstractA solution of Vlasov's linearized kinetic equation is given for propagation of high-frequency disturbances along a flat high-density electron beam moving in an external electrostatic field for the case of complete passage of the current and current limiting by the collector potential. An example of disturbance propaga tion in an accelerated electron beam is considered.
Show AbstractExpressions are obtained in the Green's function formalism for the optical poten tial with consideration of the contributions from inelastic scattering processes with excitation of particle-hole states of the target nucleus. The dependence of the optical potential on the energy is governed by the interaction of the particle with more complex states of the intermediate system that are excited in the direct processes.
Show AbstractThe decisive factor for calculation of the oscillator strengths of ions and atoms in the central-field approximation is the radial matrix element of the transition between stationary electron states [l]. A method is proposed for calculation of thjs matrix element by numerical integration near the nucleus and analytic cal culation of the radial integral with the aid of an asymptotic expansion of the exact Coulomb wave functions in the range where the electroncore interaction potential is Coulombic. The results of integration in this region are repre sented in the form of asymptotic series in reciprocal powers of the radius at the boundary of the core, and can be used to calculate photoionization and photo recombination cross sections.
Show AbstractA formalism that reveals community of nature between Wehner spots and the block ing effect on passage of particles through single crystals is grounded and de veloped. The method grew out of the author 1 s work on the theory of the blocking effect, and uses a nonlocal-statistical description of the beam particles, the atoms of the crystal, and the interaction between them.
Show AbstractThe influence of certain energy-spectrum features of disordered semiconductors on their static dielectric characteristics is studied. It is shown that under certain conditions, a material of this kind may be similar in some degree to a multidomain ferroelectric: spatial regions with a finite polarization factor appear in it at zero strength of the average (in the sense of macroscopic elec trodynamics) electric field. The influence of temperature on phase transitions of this type is investigated, and possible effects of illumination and sound are indicated.
Show AbstractA formula is derived for determination of the flattening of the Galaxy from star counts in two arbitrary directions in the plane perpendicular to the observer's radius vector; this eliminates the need to use star counts in the Galactic Plain, where the absorption of light is strongest.
Show AbstractThe parameters of general-relativistic superdense configurations are calculated on the basis of numerical integration of the hydrostatic equilibrium equations of GTR jointly with a number of possible variants on he equation of state of the superdense matter. The possible form of the equilibrium-configuration curve is analyzed in the density range 10^13 <ρ> 10^40 g/cm^3.
Show AbstractAn uncoupling procedure is used to derive an equation for the two-particle Green's function that corresponds to summation of the infinite series in the expansion of hopping conductivity in the electron-phonon interaction constant. The need to sum is due to the appearance of divergences in the higher terms of the series at low frequencies.
Show AbstractTwo-dimensional scanning of light by diffraction on a grating formed in α-HI03 by two acoustic waves propagating orthogonal to one another and having a common region of interaction is investigated. The maximum possible frequency deviation of each sound wave is calculated. The theoretical relations that are derived are tested experimentally. The intensity of the light deflected on the two co ordinates was about 30% of the incident light.
Show AbstractThe spatial averaging of turbulent pressure fluctuations by a flat circular sen sor having a known radial sensitivity distribution is considered. The method proposed for approximation of the real sensitivity distribution is suitable for a rather broad class of pressure tensors. Attenuation functions are calculated for the pressure-fluctuation spectrum in the proposed approximation.
Show AbstractThe values of the eddy viscosity were measured by a direct method over the rough bottom of an artificial channel. It is shown that the exchange coefficient has three maxima: at ɳ≅0,03,ɳ≅0,27,ɳ≅0,5.
Show AbstractComputer modelling was used to study the behavior of dislocations near slip bands composed of edge or screw dislocations. Distributions are obtained for the start ing stresses of the dislocations, the path lengths, and the transverse-slip dis tances as functions of the level of the external stress, the distance from the slip band, and the orientation of the crystal. The modelling data are compared with certain experimental results.
Show AbstractGravitational, electromagnetic, strong, and weak interactions are examined from a unified point of view. The need to introduce an additional interaction is demonstrated. The transformation properties of various tensors are derived for transformation to a uniformly accelerated reference system.
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