Hierarchical star clusters with maximum population
Hierarchical star clusters with maximum population
V.G. Surdin
It is shown that hierarchical stellar systems containing tens of components may exist in the Galaxy. They can be sought by cosmic astrometric instruments, and if the results are positive, this will provide very valuable data for stellar cosmogony.
Show AbstractApplication of Lanczos-type methods to compute the waveguide modes
Application of Lanczos-type methods to compute the waveguide modes
A.N. Bogolyubov, A.L. Delitsyn
Lanczos-type methods are applied for solving the generalized algebraic eigenvalue problem which occurs in the finite-element waveguide mode analysis. The line of approach is suggested, which stabilizes the calculation of smaller eigen- values in the presence of a high-multiplicity zero eigenvalue. Computational features of the problem are discussed.
Show AbstractRadiation-induced shift of the ground-state energy of an electron in a static magnetic field in (2+1)-dimensional quantum electrodynamics
Radiation-induced shift of the ground-state energy of an electron in a static magnetic field in (2+1)-dimensional quantum electrodynamics
I.M. Ternov, A.V. Borisov, K.V. Zhukovskii
The one-loop radiation-induced shift of the ground state energy of an electron in a magnetic field has been calculated within the framework of (2+1)-dirnensional quantum electrodynamics whose Lagrangian includes a Chern-Simons term of a topological nature. The asymptotic behavior of energy shift as a function of field intensity and topological mass parameter has been examined. A comparison with the known results of (3+1)-dimensional electrodynamics has been made.
Show AbstractStructure of highly anisotropic laser speckle patterns
Structure of highly anisotropic laser speckle patterns
Yu.V. Vasiliev, E.F. Kuritsyna, A.E. Lukyanov
The paper describes an experiment on the generation of laser speckle patterns with high value of transverse anisotropy. An express-method of visual photometry is proposed for the qualitative analysis of the structure of highly anisotropic laser speckle patterns.
Show AbstractО порогово-критических нелинейных эффектах при распространении сейсмоволн в вязкоупругих геосредах
О порогово-критических нелинейных эффектах при распространении сейсмоволн в вязкоупругих геосредах
С.А. Арсеньев, М.М. Вахрушев, Н. К. Шелковников
В рамках вязкоупругой модели геосреды с реологией Максвелла, получены и исследованы нелинейно-диссипативные эффекты, возникающие при распространении сейсмоволн с большими числами Маха.
Show AbstractLaser femtosecond spectrochronography
Laser femtosecond spectrochronography
N.I. Koroteev
А series of studies presented at the 1996 Lomonosov Lectures is described. The studies were devoted to ultra-fast nonlinear-optical diagnostics of laserinduced processes in the substance bulk and at the interface. They included the development of physical foundations and the organization of pioneering experiments with the aid of specially designed pulsed laser systems. The structurally sensitive techniques of nonlinear-optical time-resolved diagnostics, or spectrochronog1·aphy, developed in this research, have speeds of response in the range from units and tens of nanoseconds to tens and hundreds of femtoseconds.
Show AbstractPowerful focused ultrasound: nonlinear effects, excitation of shear waves and medical diagnostics
Powerful focused ultrasound: nonlinear effects, excitation of shear waves and medical diagnostics
О.V. Rudenko
Phenomena that accompany focusing of powerful ultrasonic beams have been reviewed. А possibility to increase the radiation force and to contract the region of its localization in а nonlinear focusing operation has been shown. А method has been proposed to produce shock fronts in the focus due to the synthesis of а special initial profile which enaЫes the wave energy to Ье transported with almost no losses and to organize its local liberation in the focus bу "switching on" nonlinear absorption. А theory has been developed of а new higbly sensitive diagnostic method based upon remote excitation of low-frequency shear waves in soft biological tissues Ьу means of powerful modulated ultrasound.
Show AbstractParametric solitons in quadratically nonlinear media
Parametric solitons in quadratically nonlinear media
А.Р. Sukhorukov
The article is а review of publications on parametrically bound three-wave solitons in dispersive anisotropic media with quadratic nonlinearities. The character of cooperative self-action of plane monochromatic waves is studied. The properties of space and time solitons are discussed in the framework of quasi-optical diffraction theory and of the second approximation of linear dispersion theory with regard to the detuning of phase and group velocities. А simple model is considered of mutual focusing of beams and pulses in а medium with quadratic nonlinearity. BistaЫe solitons are analyzed for the case of interference between two channels of wave packet reactive interaction with an integer frequency ratio and in the presence of cuЬic nonlinearity. The evolution of extremely short pulses described in numerical experiments bу nonlinear Maxwell equations is traced. Experimental results of observation of optical solitons in crystals with quadratic nonlinearities are reported.
Show AbstractOn certain inverse problems of cementation technology
On certain inverse problems of cementation technology
V.B. Glasko and Yu.V. Glasko
The correct statement of proЪlems concerning the determination of parameters of а gas atmosphere in the process of cementation basing on indirect data, and the determination of the equilibrium constant in the interaction of an atmosphere with the metal surface for the same process has been proposed and justified. The algorithms of their solution have been developed and realized in Si-programs.
Show AbstractInternal field of action arising in pulsed magnetic reversal of iron borate single crystals
Internal field of action arising in pulsed magnetic reversal of iron borate single crystals
0.S. Kolotov, Кim En Hen, and V.A. Pogozhev
It has been shown that the internal field of action in iron borate single crystals, as distinguished from the other known magnetic materials, is accelerating at the initial stage of pulsed magnetic reversal. When the main stage is completed, the field changes its sign, reaches the value of the external remagnetizing field, and oscillates about this value with а gradually decreasing amplitude. The oscillation amplitude reaches its maximum with the remagnetizing field strength corresponding to а magnetic reversal curve break.
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