Vol 18, No 1 (2015)
- Year: 2015
- Articles: 14
- URL: https://journals.ssau.ru/pwp/issue/view/383
Articles
9-12
Double wavefront reversal at six-wave interaction on the thermal nonlinearity
Abstract
The spatial selectivity of the six-wave radiation converter on the thermal nonlinearity has been analyzed. An expression establishing unambiguous relationship between the spatial spectrum of the object wave with double wavefront reversal and spatial spectrum of the temperature grating has been obtained. The dependence of the angular spectrum half-width of the object wave from the nonlinear medium thickness has been found.
13-17
Study of filtering algorithms receive digital messages using MIMO technology in channels with memory
Abstract
The article investigates the three different algorithms to combat intersymbol interference in a MIMO-communication systems with a 2x2 configuration (zero forcing algorithm, minimizing mean square error algorithm and the algorithm «technique as a whole with elementwise decision»). The mathematical modeling and the comparative characteristic of effective filtering algorithm.
18-22
Calculation of the elements of the complex dielectric tensor for anisotropic materials
Abstract
The calculations of the real part of complex dielectric constant of silicene is produced by the first principles. Using the SIESTA program, the wave functions were constructed. For a sicilene layer the reflection frequency - angle spectra have been analyzed in the ATR configuration. The surface polaritons may be generated in this case.
23-27
28-37
About discrete models of oscillatory systems
Abstract
The algorithm of numerical integration of a task of Cauchy for the equations of the movement of nonlinear oscillatory systems is offered. Transformation of finite difference computing algorithms in objects of nonlinear dynamics in discrete time is shown.
38-43
Quantumchemical analysis of interaction of atomic hydrogen with boron nanotubes of various structural modifications
Abstract
This article presents the results of theoretical research of the influence of structural modifications of boron nanotubes on their electronic structure and conductive characteristics as well as the results of calculations of the sorption properties of single-walled boron nanotubes to atomic hydrogen. Features of external adsorption mechanisms of H atom on the surfaces of small diameter boron nanotubes with various configuration and the changes of a carrying-out and charging condition of the hydrogenated nanotube systems caused by these process are discussed. The calculations were performed using the models of ionic-built covalent cyclic cluster and molecular cluster using semi-empirical scheme MNDO.
44-49
Coiled supracrystalline nanotubes as solenoids for nanoelectronics
Abstract
The methods of conductive supracrystalline nanotubes spiralization are shown. Such coiled nanotubes can be used as the solenoids in nanoelectronic components of radio-technical systems. The calculations of conductance of the solenoids and inductance of the magnetic field created into them are given.
50-54
Accuracy of a fixing of radiators of sequences super-broadband impulses in triangulation systems
Abstract
With use of the spectral power equation of a direct radio channel for calculation of energy of non-harmonic signals on entrances of spaced receivers mean square errors of a fixing of sources of regular sequences of super-broadband impulses in triangulation systems taking into account the directed properties of the transferring and reception antennas are calculated. Angular coordinates of radiators were estimated by synchronous measurement of time of arrival of signals in various points of space. Mean square errors of an assessment of location of objects, for the radiation and which interception of signals aperture antennas and linear antenna arrays are used are investigated. The analysis of dependences of an error of determination of coordinates of radiators on width of a strip of working cyclic frequencies and the electric sizes of antenna systems is carried out.
55-59
Statistical characteristics of the signal and noise detection and measurement of parameters of the motion of extended objects
Abstract
Questions associated with the analysis of statistical characteristics of signals and interference of radio engineering devices in the middle of the action. The results of analysis of statistical characteristics of the signal envelope at the impact of the multiplicative noise. For the approximation of the envelope is the predominant use of the PDF of Nakagami. Questions of evaluation one of the statistical characteristics of the emission processed processes of the coefficient of loss of signal envelope is below a predetermined threshold level. The dependence of the coefficient of loss from the threshold level of signal processing.
60-67
The synchronization system of the pseudo random sequences in the measure equipment of the logical functional control of the digital control channels
Abstract
The analysis of the working of the synchronization system of the pseudo random sequences in the control error system in the digital control channels by the absence of the noise was taken. The principles of the analysis of the synchronization system of the sum and the recommendations by abbreviation of the input time in the synchronization were given.
68-78
Optimization of the transition function of a modular uninterruptible power supply slave type
Abstract
The system uninterruptible power supply with an output voltage sine wave used several parallel-connected uninterruptible power supplies. In the linearized model output inverter delay is not taken into account the phase of the output signal pulse - width modulator. To account for the delay unit uses a standard Simulink - Transport Delay. Optimization of the transition function performed by a function block Signal Constraint. As a result, the coefficients found PID - regulator system inverter control.
79-84
Instrument for investigating the distribution of ions formed at high-speed collision of solids
Abstract
This paper describes a device for studying the spatial distribution of ions formed at high-speed collision of solids. A variant of the construction and structural scheme of the device, which increases the accuracy of the information about the physical parameters of a rigid body strikes. The device provides the ability to study the distribution of ions formed in space at different angles of the collision solids. Consider the motion of ions in the electrode system at different angles to the electric field inhibitory.
85-89
About the reason of quarks confinement in the Yang - Mills field
Abstract
On the basis of the analytical solution at the some approximation of the Yang - Mills field equations the proof of inevitable existence of the quarks confinement is received. It is shown, that as a result of components of the field nonlinear interaction on a way of a possible start of a quark from the hadron the configuration of the field as a potential barrier is formed. Physical consequences of inversely proportionality of the tensor-potential field components from the strong coupling constant are discussed.
90-96
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