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The paper presents results of a study of commutation characteristics and triggering stability of small-sized vacuum switches with discharge gaps of about 1 mm. The experiments were carried out in microsecond range of pulse durations with current amplitudes from 50 A to 5 kA, and current rise rates of 109 … 1010 A/s. The upper limit of the commutated voltage range was limited by self-breakdown of the...
For the analysis of changes in parameters of microwave discharge plasma used kinetic scheme of nonequilibrium processes. This scheme considers processes of elastic scattering, dissociation, ionization and excitation of atoms and molecules of hydrogen. Use Maxwell approximation for energy distribution of electrons. Presents relations of hydrogen ions and atoms concentration from time for different...
This article describes the development of a highly efficient generator, an overview of its relevance, scope of use, search for the best creation of the magnetic field, showed the advantages of this product, its structure and design options, the concept and the results of its work. As a result of this article, you can clearly see that the generator is more efficient than many modern counterparts. The...
In this paper we considered the method of automatic correction of systematic error of pulse reflectometer. We analyzed the main sources of errors in reflectometer. The analysis showed that the main source of error is the assignment of the phase velocity of the pulse. Expressions for calculating the error rate of the phase deviations of parameters of the line depending on the frequency. A functional...
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 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 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...
The paper examines the way of separating a regular component in the electrical signal based on the analysis of the representative point trajectories in the phase plane. The work presents an algorithm for constructing the phase diagram of the process according to signals received from piezoelectric transducers. Mathematical support for calculation of the regular component based on the density analysis...
Article associated with a type of gasothermic processing, namely the detonation-gas treatment, which today is less popular due to the physical characteristics of the process. Material is overview and summarizes the results of the work in the field of gasothermic. The article discusses the mechanism of combustion of hydrogen-oxygen mixture as the main working gas in detonation-gas spraying coatings...
A use automatic network analyzer based on down conversion of measuring frequency of multi-port reflectometer ports' responses is proposed to overcome the problem of weak tag signal blocking by a high-power carrier signal from reader. This approach does not require the carrier signal reader compensation. The basic measuring equations of the new meter are obtained. The advantages of the proposed meter...
The results of structuring silicon surface after vacuum-plasma treatment through discontinuous carbon film are shown. The geometric and concentration features of silicon juts are established. The range of radius of rounding is 0.5–5 mkm depending on type of surface and treatment. The range of concentration 6∗108–1.6∗109 cm2 depending on type of surface and treatment. As shown the freon plasma treatment...
The paper describes the results of tests performed to obtain interrupting capability parameters of triggered vacuum switches. The switches used in all tests had sealed-off designs with lengths of the main discharge gaps of about 1 mm. The experimental conditions covered a range of peak currents of 1 to 5 kA with current fall rates up to 5 kA/μs. The upper level of commutated voltage (∼5 kV) was limited...
Quality ferritometallicheskih permanent connection nodes made by diffusion bonding depends on the choice of optimum technological modes. Investigation of the effect of diffusion bonding process regimes (temperature, pressure, and specific time delay) on the quality of connections ferritometallicheskih nodes was performed using the ultrasonic testing for the presence of defects such as cracks and chipped...
In article features of a control system of electro generation of the independent illuminant using solar and wind energy by their transformation by means of the electric generator are considered. The developed electric energy collects in the accumulator and moves on a power supply circuit of the LED lamp. The scheme contains the electronic system of regulation of the winding of excitement of the electric...
Description of microwave discharge plasma electrons and ions heating occur with using conclusions of trajectory model. Presents equations describing changes of plasma components temperature, whose energy distribution function is similar to Maxwell. For compile these equations used kinetic scheme, considering processes of elastic scattering, dissociation and ionization of hydrogen atoms and molecules...
The article shows the overhead line tower design for «smart» power grids. The tower is equipped with the information and measuring apparatus for the detection of emergency conditions. The principle of the diagnostic system is based on recording changes in the electromagnetic field around the line and tower during emergency conditions. It should be noted the ability to transfer power that exceeds the...
In the present work we discuss the possibility to apply the equivalent circuit approach for modelling of the single neuron activity. The proposed approach is based on the using of the SPICE simulation of the well-known FitzHugh-Nagumo numerical model that consists from two first order ordinary differential equation. The SPICE model for FitzHugh-Nagumo neuron activity model has been developed in the...
Study of p-i-n diode with application of wavelet transform to analyze the characteristics. Includes laboratory workshop, including laboratory stand with a description of the individual components of the installation, allowing to obtain the characteristics of p-i-n diode for further study using wavelet analysis. The article analyzes data using wavelet transform based on the upgraded software product...
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