The defect-strain theory of formation of subboundaries during crystallization of semiconductor films
The defect-strain theory of formation of subboundaries during crystallization of semiconductor films
V.I. Emelyanov, A.A. Sumbatov
A new, defect-strain mechanism of subboundary formation during laser-induced recrystallization of semiconductor films is proposed. It underlies the theory yielding an explicit analytic expression for the separation between subboundaries as a function of film thickness and the melt zone velocity. The theoretical results obtained show good agreement with experiment.
Show AbstractA singular quantum oscillator
A singular quantum oscillator
V.B. Gostev, A.R. Frenkin
The stationary Schr$\stackrel{..}{o}$dinger equation for an oscillator with perturbation $\lambda x^{-2}$ has been revised. A new choice of even states of the singular oscillator is made based on the automodel requirement for the solution to the Schrodinger equation for a free particle with the same perturbation. In contrast to the orthodox solution, the suggested solution provides alternation of even and odd levels and the stability of the ground state, and consequently, is physically preferable.
Show AbstractUnified description of scattering in the one-dimensional Green's function approximation
Unified description of scattering in the one-dimensional Green's function approximation
A.M. Popova, A.V. Kharchenko
A unified model is proposed for describing both the small- and large-angle high-energy scattering. The scattering amplitude for the Jocal potential in a Gaussian form has been computed. The results agree well with the exact scattering amplitude and with the eikonai approximation.
Show AbstractNatural waves of a periodic waveguide coupled to the electron beam
Natural waves of a periodic waveguide coupled to the electron beam
V.I. Kanavets, A.S. Nifanov, A.I. Slepkov
The natural waves of a periodic waveguide loaded with electron beam have been analyzed by the multimode matrix method. The structure of a field corresponding to "hot" modes of the system has been studied. The beam-field interaction in relativistic Cherenkov oscillators has been shown to be a multiwave process.
Show AbstractModeling of chaotic self-modulation of radiation in a self-contained injection laser
Modeling of chaotic self-modulation of radiation in a self-contained injection laser
D.D. Gribkov, Yu.I. Kuznetsov
A single-mode lumped-parameter dynamic model of a self-contained injection laser is proposed. The model takes into account the effect of carrier diffusion and helps describe the chaotic self-modulation of radiation. The results of a numerical experiment are given.
Show AbstractA cluster model of the interaction of radiation with nonlinear gyrotropic crystals
A cluster model of the interaction of radiation with nonlinear gyrotropic crystals
A.A. Golubkov, V.A. Makarov
A cluster model is proposed for the interaction of radiation with nonlinear gyrotropic crystals. The model describes the effects of spatial dispersion within a classical approximation.
Show AbstractOn the stability of light fields in passive nonlinear ring resonators
On the stability of light fields in passive nonlinear ring resonators
K.V. Shishakov
The paper examines the stability of coherent light fields in passive nonlinear ring resonators with respect to time delay of the light wave and to shift disalignment of the resonator mirrors.
Show AbstractNovel device for controlling the photographic zenith tube
Novel device for controlling the photographic zenith tube
V.A. Krainov
A novel control device based on the integrated circuits of Series К155 and KR556 generates commands for starting the carriage driving motor, opening the shutter, and rotating the photographic zenith tube through 180°. The time of commencement of observation cycles and the types of cycles for 256 stars are programmed in the device. The exposure times are set automatically, depending on the type of the cycle. The device simplifies the work of the observer and helps increase the accuracy of determining the latitude and clock correction.
Show AbstractEffect of the source size and absorption on the focusing of a spherical X-ray wave upon Bragg diffraction on two bent crystals
Effect of the source size and absorption on the focusing of a spherical X-ray wave upon Bragg diffraction on two bent crystals
T. Che, R.N. Kuz'min
Expressions are derived that allow a theoretical analysis of the effects of the size of a finite source and absorption on the focusing of a spherical X-ray wave upon Bragg diffraction in a bicrystal system composed of crystals bent in mutually perpendicular planes.
Show AbstractПоправка к статье С. В. Павлова «Описание феноменологических моделей фазовых переходов методами теории катастроф»(Вести. Моск. ун-та, сер. 3, Физика. Астрономия. 1990. 31, № 1. С. 70)
Поправка к статье С. В. Павлова «Описание феноменологических моделей фазовых переходов методами теории катастроф»(Вести. Моск. ун-та, сер. 3, Физика. Астрономия. 1990. 31, № 1. С. 70)
С.В. Павлов
На с. 74 по вине автора допущена ошибка. Третий абзац сверху следует читать: «Таким образом, мы подошли к основному положению данной работы: на основании общих теорем теории катастроф и теорем работы [4] можно утверждать, что феноменологические модели ФП, содержащие не более трех параметров порядка и шестнадцати управляющих параметров, описываются одной из min-функций, приведенных в табл. 2.»
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