A scheme for taking into account high-order corrections in quantum chromodynamics
A scheme for taking into account high-order corrections in quantum chromodynamics
D.A. Slavnov
A formula for the total cross section is obtained which makes it possible to take into account third-order corrections with respect to $\alpha_s$ without calculating loop diagrams and integrating over the region of small momentum values.
Show AbstractRitz method in the problem of nonlinear measurement interpretation
Ritz method in the problem of nonlinear measurement interpretation
T.V. Matveeva, Yu.P. Pytiev
The authors consider a class of nonlinear measurement interpretation problems which reduce to calculation of a known function from a nonexactly set argument. A method for solving interpretation problems is offered which helps simplify computation process considerably and approximate well the solution of an exact problem.
Show AbstractElectron impact excitation cross sections of argon $3p^53d$ levels
Electron impact excitation cross sections of argon $3p^53d$ levels
V.E. Bubelev, A.N. Grum-Grzhimailo
Electron impact excitation cross sections a{ all levels of the fine structure of the $3p^53d$ electron configuration of the Ar atom were calculated. The calculations were made in the distorted wave approximation with consideration for the exchange amplitude. The results are compared with the available experimental data.
Show AbstractFluorescence kinetics for two models of light-harvesting matrix organization
Fluorescence kinetics for two models of light-harvesting matrix organization
E.L. Eliseeva, A.K. Kukushkin
The method of probability matrices taking into account the modern data on the structure of light-harvesting complexes of the photosystem II in higher plants has been used to calculate the fluorescence kinetics for two models with different structures of chlorophyll-protein complexes. In both models, the open and closed type reaction centers are described by single-exponent fluorescence decay curves. The fiuorescence lifetime of a closed center is 1.5 to 2.8 times that of an open one.
Show AbstractEffect of the undercurrent on the directivity of a linear hydroacoustic antenna
Effect of the undercurrent on the directivity of a linear hydroacoustic antenna
P.N. Kravchun, 0.S. Tonakanov
An approximate method is proposed for calculating the shape and the directivity pattern of a linear antenna placed in an undercurrent, as well as the dispersion of the directivity pattern due to the statistical scatter of the flow velocity. Methods for optimum selection of antenna parameters to improve its stability to flow effects are discussed.
Show AbstractMethod for measuring submillimeter waves on water surface
Method for measuring submillimeter waves on water surface
M.A. Nosov, N.K. Shelkovnikov
A transducer for laboratory measurement of submillimeter waves on water surface is described.
Show AbstractПоправка к статье П.В. Карабута и Ю.В. Чугреева «Классические гравитационные эффекты в релятивистской теории гравитации»//Вестн. Моск. ун-та. Сер. 3, Физ. Астрон. 1990. 31, № 2. С. 3.
Поправка к статье П.В. Карабута и Ю.В. Чугреева «Классические гравитационные эффекты в релятивистской теории гравитации»//Вестн. Моск. ун-та. Сер. 3, Физ. Астрон. 1990. 31, № 2. С. 3.
П.В. Карабут, Ю.В. Чугреев
При вычислении величины временной задержки радиосигнала с постньютоновской точностью по вине авторов допущена ошибка. На основании точной формулы (7) на с. 6 должно получаться следующее приближенное выражение времени задержки…
Show AbstractElectromagnetic waves in rotating Universe
Electromagnetic waves in rotating Universe
V.A. Korotkii, Yu.N. Obukhov
An exact solution is obtained for electromagnetic waves in a cosmological model of a G$\stackrel{..}{o}$del type universe. It is shown that the character of propagation and the spectrum of electromagnetic waves depend on the rotation only and are independent of the space-time causal structure.
Show AbstractApplication of variational-difference methods to dielectric waveguide calculations
Application of variational-difference methods to dielectric waveguide calculations
A.N. Bogolyubov, T.V. Edakina
Modern variational-difference methods of calculating dielectric waveguides, in particular lightguides, are reviewed. Consideration is given to the main problems that arise when the method of finite elements and the method of finite differences in the variational formulation are used to study the propagation of electromagnetic waves in straight dielectric waveguides homogeneous along the guiding axis, having a complex shape of the cross section and a complicated profile of permittivity. The paper describes various types of variational formulation, various ways of bounding the region and taking into account the behavior of the field at infinity, as well as methods of reducing the initial problem to the algebraic problem of eigenvalues and calculating eigenvalues and eigenvectors. Special attention is paid to the elimination of physically meaningless spurious solutions, the so called "ghosts".
Show AbstractOn the breaking of waves described by Whitham's equation
On the breaking of waves described by Whitham's equation
N.O. Tomilina
In this paper it is proved that in the case of a continuous and absolutely integrable kernel of Whitham's equation, an initially piecewise-smooth (sharpened) perturbation remains piecewise smooth during the whole time of existence of a solution to Cauchy's problem.
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