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The results of theoretical and experimental research in the field of high-performance microwave technology for the heat treatment of core material with low thermal conductivity are presented. The microwave method allows uniform heating of the dielectric rod throughout the volume, leads to the completeness of the polymerization reaction and high strength characteristics of the resulting products. Experimental...
Estimating parameters of a sum of complex exponentials in white noise is considered in this paper. A simplified maximum likelihood estimation algorithm based on subfactorization of a structured data matrix is proposed, and we show that parameterization of the data model in signal space allows to improve estimation accuracy at low signal-to noise ratio (SNR). Basing on the proposed algorithm the computer...
Estimating parameters of a sum of complex exponentials in white noise is considered in this paper. A simplified maximum likelihood estimation algorithm based on subfactorization of a structured data matrix is proposed, and we show that parameterization of the data model in signal space allows to improve estimation accuracy at low signal-to noise ratio (SNR). The idea of solution of the normal equations...
The article presents the results of a study of porous plasma sprayed coatings based on magnesium-substituted hydroxyapatite. Technology described synthesis of magnesium-substituted hydroxyapatite by precipitation from aqueous solutions of calcium nitrate, magnesium nitrate, diammonium phosphate and ammonium hydroxide. Results mode plasma spraying on the basis of magnesium-substituted hydroxyapatite...
In this work we studied properties of nano structures electro-plasma powder titanium coatings which are widely used in the manufacture of electronic devices. The relationship between the main functional and operating properties of coatings spraying technology parameters such as arc current, spraying distance and dispersion of sprayed material was studied. The results of examination of the physic-mechanical...
Results of research of starting modes for small-sized triggered vacuum switches (TVS) at fast-rising commutated currents are presented. The research was carried out for sealed-off TVS with discharge gaps of about 1 mm for switching current rise rates of more than 1010 A/s. It was shown that the stable mode of TVS turn-on was disturbed by short-time current falls accompanied by high voltage spikes...
A software package is developed, that allows you to calculate the effective voltage pulse parameters to suppress the chaos of metal corrosion processes. It provides technique and the technical decision on the selection of the effective parameters of the signal for the suppression of corrosion processes. On the basis of the experimentally obtained values of the corrosion current having a casual look...
Considered the problem of megacities traffic, offers an original technical solution for the automatic detection of the projection of asphalt pavement in the sequence of quasi-stationary aerial video photography, assesses the effectiveness of this solution in the task of statistical tracking of road traffic, proposed architecture of automatic measuring system on the basis of that solution, evaluated...
As technology sizes shrink, the developers come upon a problem of static power. Among the different power reduction approaches with multi voltage there are, which can significantly eliminate components of power consumption on system level. But this methods isn't applicable for implementation within functional units. We are considering issues of practical realization such well-known low-level technique...
A composite medium layered fractal structure was examined. Mathematical models of complex composite structures were developed using the effective medium theory. Algorithms and program complex, allowing exploring layered fractal structure designed. To describe the study of qualitative properties of composite media techniques are used fractal theory. The application of this approach through the conditions...
The article discusses construction of decentralized electric power supply systems based on the use of modern high-performance equipment for the joint production of electricity, heat and cooling using cogeneration and trigeneration technologies. Essential for the creation of such systems is the use of new types of high-efficiency power generation equipment (high speed microturbines and power generators...
Accuracy analysis of the basic geometrical parameters of multilayer printed wiring boards (ML-PWB) is considered. It is emphasized that ML-PWB, in contrast to many types of instrument making products may contain thousands of holes, and surrounding the contact pads on the accuracy of manufacturing which are increased requirements. The theoretical distribution laws (Gauss, Pearson, etc.) are considered...
The article attempted to calculate the optimal combination of geometric parameters of an annular magnet with trapezoid cross-section. For this results value of the magnetic induction was calculated for a magnet with a trapezoidal cross-section with different thicknesses and different combinations of geometric parameters. The dependence, according to which one of the best combinations of geometric...
For assessment sensitivity TV camera must know sensitivity a photoelectric cell. The purpose of the research: development of techniques assessment sensitivity of CCDs television sensors. Formulas for assessment of integral, spectral and threshold sensitivity of CCDs television sensors are received. The formula for determination of the optical transmission coefficient on brightness considering losses...
This article examines calculated values of the electron temperature, the coefficient of volume ionization and parameters of motion variables of charged particles in a flat low-temperature plasma of inert gases. Obtained and analyzed chart of the current and the electric intensity and lateral distribution of concentration depend of the magnetic field. The article is shown that a lateral distribution...
In this paper, we propose to change the structure of the magnetization inductor for magnets magnetized in the axial direction. This construction is characterized by the increasing from the center to the periphery (in axial direction) sections diameter. This approach has several advantages over conventionally used cylindrical inductor. In addition, we calculating the topology of magnetic field inducers,...
A mathematical model is developed to calculate the electromagnetic field in the cross section of the SRM. To implement the mathematical model was used the software package ELCUT-5.1. Two-dimensional boundary-value problem relative to the magnetic vector potential was solved by the finite element method and Newton-Raphson. Calculations of the characteristics of the electromagnetic field, static and...
The paper studied the influence of the various factors (the nonlinearity of thermal parameters, phase transitions melting and evaporation, radiation and convective cooling of the surface material, and others) on the electrical and thermal processes during the heating of the metal electrode a high current pulse. A mathematical model and algorithm and a computer program to effectively carry out computer...
The brief description of intellectual monitoring system of university students competences formation process using the complex-valued status function method is suggested. Algorithm for formation of SF are present. Monitoring system and possible aspects of intellectualized of this system are described. This work is devoted to the discussion of the intellectualization of the IS for monitoring of the...
The diplexers based on 2D electromagnetic crystal are investigated with the help of the numerical electrodynamic analysis of 3D models. The input half-wave resonator has rolled up strip conductor in the claimed microstrip designs tuned with nearly adjacent bandwidths. It allows to coordinate channels rather easily. Such resonator in the first two-channel device at the same time interacts with pair...
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