Neutrino oscillations in homogeneous moving medium
Neutrino oscillations in homogeneous moving medium
A. E. Lobanov, A. V. Chukhnova
We obtain the probabilities of the spin-flavor transitions in unpolarized moving matter in the two-flavor model using the solution of the quasi-classical equation, which describes both neutrino flavor oscillations and its spin rotation. Neutrino spin behaviour is investigated taking into account neutrino flavor oscillations.
Show AbstractAccount for the CP-violation in the exponential parameterization of neutrino mixing
Account for the CP-violation in the exponential parameterization of neutrino mixing
K. V. Zhukovsky
The exponential parameterization of the neutrino mixing is studied; it allows distinguishing of pure rotational part of the mixing matrix and of the part, in charge of the CP-violation. The logarithm of the mixing matrix is computed. Based on the last experimental data on the neutrino mixing, the exact values of the parameters of the exponential neutrino mixing matrix are calculated. The real part, corresponding the real rotation in space, and the imaginary part, corresponding CP-violation and rotation around the axis with imaginary coordinates, are distinguished. Factorization of the mixing matrix is demonstrated in the form of two rotations around real and imaginary axes. The complementarity hypothesis is confirmed.
Show AbstractPeculiarities of dielectric properties of proton conducting (K$_{0.3}$(NH$_{4}$)$_{0.7}$)$_3$H(SO$_4$)$_2$ single crystals (to discussion of negative dielectric permittivity)
Peculiarities of dielectric properties of proton conducting (K$_{0.3}$(NH$_{4}$)$_{0.7}$)$_3$H(SO$_4$)$_2$ single crystals (to discussion of negative dielectric permittivity)
N. D. Gavrilova$^1$, I. A. Malyshkina$^1$, V. K. Novik$^2$, E. V. Selezneva$^3$, I. P. Makarova$^3$
On the example of superprotonic crystal (K$_{0.3}$(NH$_{4}$)$_{0.7}$)$_3$H(SO$_4$)$_2$, a first attempt was made to detect, by means of dielectric investigations, the presence of structure elements in the material, which are devoid of elastic bonds or having loosen bonds with crystal matrix. It was shown that it is possible to separate contributions from structure elements with elastic bonds, which are devoid of elastic bonds or having loosen bonds in comparison with influence of measuring field. A supposition was stated about sequence of physical mechanisms which determine the reaction of quasi-free structure elements on the growth of measuring field.
Show AbstractApplicability of long-wave approximation to the description of tsunami dynamics
Applicability of long-wave approximation to the description of tsunami dynamics
M. A. Nosov
The quantitative criteria defining areas of applicability of the equations of a shallow water theory and the Boussinesq equations at simulation of tsunami dynamics are presented. Approach to use of the received criteria in practice is described.
Show AbstractThe influence of deformation processes on the permeability of rocks and the stability of an oil well
The influence of deformation processes on the permeability of rocks and the stability of an oil well
V. I. Karev$^{1,2}$, Yu. F. Kovalenko$^1$, V. V. Khimulya$^{1,2}$
The paper studies the effect of real stresses occurring in the vicinity of a horizontal well on the filtration and strength properties of rocks for the Prirazlomnoye offshore field. The rocks from two intervals of the reservoir section with different structural and lithological characteristics were studied. The experiments were carried out on the Triaxial Independent Load Test System of the Institute of Problems in Mechanics of the Russian Academy of Sciences. Modeling showed that the filtration properties of the rocks under study strongly depend on the stress-strain state. When the pressure in the well drops to a certain critical value, they deteriorate. Then there is a cracking, disintegration of the rock in the vicinity of the well, accompanied by a sharp jump-like increase in permeability. The values of the pressure at the bottom during drilling which are necessary to maintain the stability of the wellbore were defined. The density of the drilling mud was calculated, for which there is no destruction of the wellbore. The influence of the initial stress state in the formation on the deformation and fracture processes in the vicinity of the well was studied experimentally.
Show AbstractInfluence of the reactive atmosphere during magnetron sputtering on evolution of the phase composition of diamond-like coatings doped with chromium
Influence of the reactive atmosphere during magnetron sputtering on evolution of the phase composition of diamond-like coatings doped with chromium
I. S. Levin$^{1,2}$, V. M. Avdyukhina$^1$, M. M. Khrushchov$^2$, V. A. Schergunov$^2$
In the work, samples of diamond-like carbon coatings doped with chromium, obtained with the help of magnetron sputtering technology in active gas media, were investigated. The influence of the features of coating deposition (first of all, the composition of the sputtering atmosphere) on their phase composition and the fine atomic structure was studied. X-ray diffractometry was used as the main research method.
Show AbstractMethods of accelerated convergence in statistical physics
Methods of accelerated convergence in statistical physics
P. N. Nikolaev
In the work the classification of the methods of accelerated convergence used in statistical physics is given. Among them a combined method using physical analysis of the system and mathematical methods of accelerated convergence is picked out. Its effectiveness is shown for obtaining the Carnahan-Starling equation. The proposed method is of a general nature and is applicable to a wide class of systems.
Show AbstractModern physics in the course "History and methodology of physics"
Modern physics in the course "History and methodology of physics"
P. N. Nikolaev
The principles of the construction the exposition of the modern physics in the course "History and methodology of physics" is investigated. The causal link between the state of modern physics and the content of the course "History and the methodology of physics" has been noted.
Show AbstractAnalysis of information search capabilities in physics: the problem of internet searching on the example of acoustics
Analysis of information search capabilities in physics: the problem of internet searching on the example of acoustics
V. G. Shamaev$^1$, A. B. Gorshkov$^2$, L. G. Guschina$^3$, V. I. Yakimenko$^4$
Problems of online access to scientific information are discussed. Brief information on foreign information retrieval systems is given. The state of information support for Russian-language sources in the USSR and now is described. The absence of a single center for collecting and providing information on Russian-language scientific publications is noted. A scheme is proposed for use in the creation of such a center. A possible cluster of this center is described on the example of acoustic topics, already implemented at the Acoustics Department of the Physics Department of the M.V. Lomonosov Moscow State University. The corresponding portal «Acoustics» (http://akdata.ru) is in the public domain on the Internet. Entrance points of the portal: full-text archive of «Acoustic Journal», «Signaling information» on acoustics and «Information retrieval system. Acoustics. Russian-language sources». Brief description of the work with the system is provided. The developed technologies for the preparation of information resources and the resources themselves constitute a complete system of information support for acoustic research in the Russian-speaking segment. They also make it possible to provide a full reflection of the Russian-language scientific literature for monitoring and expert evaluation of the scientific activities of Russian scientists, which can contribute to strengthening the positive image of Russian sci-ence in the world. Questions of priority and preservation of intellectual property are being raised. It is concluded that only properly organized information support can guarantee the pu-rity and novelty of the scientific results that underlie the research process.
Show AbstractMathematical model of periodic waveguide systems with rectangular cross-section
Mathematical model of periodic waveguide systems with rectangular cross-section
M. I. Svetkin, A. N. Bogolubov, A. I. Erokhin, V. M. Pikunov
A mathematical model of an ideally conducting periodic waveguide system with piecewise constant rectangular cross-section is proposed. This type of geometry is finding application in the development of terahertz devices more often recently. The problem to solve is a system of Maxwell equations supplemented by metal boundary conditions and Floquet conditions on cross-sections spaced by one period of the structure. The solution of the problem is based on incomplete Galerkin's method and projection field conjunction in the region of cross-sections jumps. Direct use of this approach leads to matrix problems with ill-conditioned matrices due to simultaneous presence of exponentially increasing and decreasing matrix coefficients. In this context the method to be proposed additionally takes into account the directions of wave propagation in any regular section in the system, which makes it possible to eliminate exponentially increasing elements and make the matrices well-conditioned. Internal wave reflections occurring within the considering period of the system are taken into account explicitly. Based on the proposed model the dispersion characteristics of various structures are constructed. The convergence of the method to the limiting cases is investigated.
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