IKBFU's Vestnik

Physics, mathematics, and technology

Fundamental and technical physics

One method for constructing exact solutions of equations of two-dimensional hydrodynamics of an incompressible fluid

Abstract

We propose a simple algebraic method for constructing exact solutions of equations of two-dimensional hydrodynamics of an incompressible fluids.The problem reduces to consecutively solution three linear partial differential equations for a nonviscous fluid and to solving three linear partial differential equations and one first-order ordinary differential equation for a viscous fluid.

Download an article

The relations for potentials of filtration flows in media with common boundary and there employing for founded solutions some problems

Abstract

The structure of filtration flows in two-dimensional laying media is studied. The definition of positive and negative flows is giving. The relations for complex potentials in media with common boundary are receiving. There are employing for founded solutions some problems.

Download an article

Application of means of modelling of environment Simulink in problems of the analysis of quality of systems of regulation

Abstract

Presented the results of the synthesis and analysis of the system of temperature control for the camera kiln electrode products. By using Simulink held simulation of control systems with man — operator, with a parametrically оптимизируемым regulator and neuron network predictor controller. Defined indicators of the quality of the transient processes camera kiln for different variants of functioning of the system. Shows the advantage of using neural networks predictive controller for control of thermal processes.

Download an article

Radiophysics and radiotechnique

Investigation of distortions of the chirp signals in the neighborhood of critical frequencies of ionospheric plasma

Abstract

Numerical experiments are performed to investigate the dispersion distortions of chirp pulses propagating in the ionosphere with taking the three-dimensional non-uniformity, anisotropy, and dispersion of ionosphere in dependence on geophysical conditions into account. Propagation, absorption,and the time delay of ordinary and nonordinary waves are analased.

Download an article

The dynamics of ground-level aerosol lidar observation in Kaliningrad

Abstract

The paper presents an analysis of the spectra of atmosphere aerosol variations and variations Total Electron Content in the ionosphere (TEC). Monitoring of atmospheric aerosol performed with using of the two-wavelength (532, 1064 nm) atmospheric lidar (LSA-2S). Ionospheric TEC parameter determined from the observation of the navigation satellites signals GLONASS (Leica1200). The observations in the lower atmosphere and ionosphere were executed simultaneously in the period February — March 2012. Analysis of the observations showed that during the period of solar terminator passing in the lower and upper atmosphere, there are variations of parameters with periods close to the period Väisälä — Brunt in the lower atmosphere. It is assumed that such disturbances are excited in the lower atmosphere and propagate into the upper atmosphere. It is assumed that the disturbances with periods close to the period of the Väisälä — Brunt can take an important part in the implementation of dynamic relationships of lower and upper atmospheric layers

Download an article

Application of radio physical methods for diagnostics of functional properties of magnetic tunnel transitions

Abstract

The article presents the main investigation results of the structural and magnetic parameters of a series of samples formed on single-crystal (MgO) and on amorphous substrates Si/SiO2 structures. Were assessed quality indicators such as the paramagnetic phase, the presence of impurities, and an analysis of the functional properties through continued Gilbert was done. The radiophysical methods features for the diagnosis of prospective structures were shown.

Download an article

The solution of a problem of detection of a signal at vertical sounding of an ionosphere

Abstract

In the real work the solution of a problem of determination of parameters of the radio impulse reflected from an ionosphere is considered. The noise component, and also the multibeam structure of a signal arising at formation two magnetoionic component is thus considered. Expression for definition of probability of reception of a radio impulse in these conditions is received.

Download an article

Ionospheric station of vertical sounding of an ionosphere «Vector»

Abstract

The structure of station of vertical sounding "Vector" and results of correlation data processing is presented. For vertical sounding of an ionosphere the difficult signal in the form of the М sequence, containing 16 positions is used. Ways of further modernization of station are shown. Them treat expansion of opportunities of determination of parameters of signals at twofold reflection from an ionosphere.

Download an article

Use of difficult signals at vertical sounding of an ionosphere

Abstract

In the real work questions of sounding of an ionosphere are considered by difficult signals. Efficiency of use of signals with big base on an alignment with signals with base about 1 is estimated. It is shown that when using difficult signals it is possible to lower significantly capacity at preservation of invariable level of permission.

Download an article

Research of process in bistable system when passing the mix of the harmonious signal and «white» noise

Abstract

In the work the mechanism of compound harmonic signal and noise through the bistable system which role carries out Schmitt's trigger is considered. Dependence of signal-to-noise ratio on different factors is shows. Necessary conditions for ensuring increase of the signal-to-noise ratio at the output of the system are defined. The decision on practical implementation of the effect in electronic circuits of various purposes is submitted.

Download an article

About opportunity of integration of antenna systems into bearing constructive elements of mobile objects

Abstract

Possibility of use in antenna systems of an additional dielectric layer is considered. At the expense of use of the phenomenon of «shortening» of an electromagnetic wave in environments with high dielectric permeability there is a possibility of creation of the integrated antennas on a surface of bearing designs of mobile objects.

Download an article

Evaluation of noise stability reception FSK-signal by quadrature reception device

Abstract

A comparative evaluation of the model and the theoretical curves of the probability of bit error at the output of the unbounded receiving device of MSK-signals in presence of white Gaussian noise. It is shown that this method of signal processing provides declared value of noise stability in critical values of SNR region compared with existing demodulators.

Download an article

Mathematics

A mathematical simulation and a numerical investigation of dynamics of intramolecular tautomerny transformation without considering processes of a proton relaxation. Part I. A description of a mathematical model

Abstract

There is a quantum statistical model of prototropic tautomeic transformation caused by vertical transition between different adiabatic potentials with two minima divided by potential barrier offered. Formula for the probability function defining time of tautomer transformation without regard to vibronic relaxation is received.

Download an article

3D-simulation of equatorial F-spread: a comparing MI3 with SAMI3

Abstract

Group of scientists of the Immanuil Kant Baltic Federal University (I. Kant BFU) in 1989 developed a three-dimensional code to study equatorial F-spread (EFS) studying. The Naval Research Laboratory (NRL, Washington, DC, USA) in 2008 developed a three-dimensional code to study equatorial spread F (ESF) also. Comparison of these models is made. Differences in number of ions and the accounting of electrons speeds and inertial terms are found.

Download an article

Creations of a hardware-software complex providing dynamic balance and movement robotic system AR-600

Abstract

Features of architecture and creation of robotic system AR-600 are described. The main objectives of loudspeaker of biped walking and methods of their decisions are considered. Calculations of necessary corners at movement and time of their performance are presented. As the question of creation of the filter of Kalman for system aksilerometr-giroskop-robotic system is considered.

Download an article

Informatics and mathematical geophysics

Principles of geological interpretation of the scattered waves field

Abstract

The basic principles of geological interpretation of the scattered waves field are represented. One the basis of scattered waves sections and map analysis had made the forecast of fracture cavernous reservoirs. These reservoirs are very perspective object for oil deposits exploration. The researchers are based on original prestack migration method — Common Scattering Point, which makes it possible to get two independent time cubes: reflected waves cube and scattered waves cube. The last are generated in fractured zones.

Download an article

Modelling of microseismic noise of the block structuring rock massif

Abstract

The model of microseismic noise in block structuring rocks is offered. Results of numerical researches of the signal form and spectral structure of microseismic noise in productive block structuring layers, dependence of the correlation radius of mid-frequency noise on the receivers position in relation to a layer generating noise are resulted. Recommendations about algorithms of the useful signal allocation and a location of internal seismic events on the basis of the inverse kinematic problems decision are made.

Download an article

Development of technology for publishing very large spatial data volumes using open source systems

Abstract

The technology of large spatial data volumes pre-processing and publication using different methods to optimize access to the raw data to achieve optimal performance mapping system based on the open source software. The methods for optimizing very large scale spatial data across different scales of data generalization and publication of fragmented images

Download an article

Numerical solving the linearized inverse problem for two-parameter acoustic equation

Abstract

In this paper we develop а numerical algorithm for solving inverse dynamical problem: recovering two parameters of the acoustical medium (density and compressibility modulus) by boundary measurements (response operator). The solution is based on a linearized version of the Boundary Control method: the response operator explicitly determined some bilinear energy forms w. r. t. boundary controls. We use linearized presentations of these forms w. r. t. to background. The results of numerical experiments are represented.

Download an article

Sufficient conditions of a correctness of statement of regional tasks for one class of the evolutionary equations

Abstract

In this work regional tasks for one class of the equations arising in the theory of distribution of light in the turbulent environment are studied. In work sufficient conditions are indicated to coefficients at which the objective without initial data for the nonclassical equations is correct in S. L. Sobolev's spaces.

Download an article

Numerical solution of the linearized inverse problem for acoustic equation

Abstract

In this paper we develop an algorithm of numerical solution of the inverse dynamical problem about speed of sound reconstruction in horizontally layered acoustical medium. The solution is based on linearized version of the Boundary Control Method. The inverse data is the response at the single boundary point from the boundary point source; the probe pulse is the Ricker wavelet. The results of numerical modeling for two-dimensional domain are presented.

Download an article