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Technologies of vacuum electron devices and their prospects of development based on nanotechnological approaches are considered. It is shown that the vacuum electron devices operation inevitably leads to a change in original characteristics of device elements in nanoregions due to intensive mutual influence of its parts with different properties and functions in consequence of the combination of these...
The article highlights the problems of the efficiency of vibration test methods and means. It gives the brief overview of existing methods. It also gives characteristics of the developed multi-channel vibration measurement machine, its component parts and the benefits of its application. The test results are given that prove that the developed vibration vibration measurement machine allows to reproduce...
One of the areas is a 3D printing frequency (RF) dielectric heating is used to intensify heat treatment of various dielectric materials used for constructing 3D models. Electrotechnological microwave system with 3D printer allows you to accelerate the process of prototyping, and eliminate disadvantages such as deformation of the object and resize when sintering at use as a material of clays and other...
Multi-antenna GNSS are widely used in various industries, it consists of three or more L1 GPS receivers. This system provides the high accuracy of relative coordinates determination (centimeter accuracy). The main drawback of this system is a long start period because of the need of resolving phase ambiguities. Analysis of the resolving was held and the method of reducing start time was proposed....
The article proposes an approach to calculating the aliasing error when sampling signals from smart sensors. Antialiasing filter placed before the time discretization of an analog sensor signal (the developers are trying to receive a finite signal spectrum of the sensor). But errors of modern sensors sometimes reach 10−12…10−24 that makes the filter settings burdensome requirements on error of the...
The work considers possibilities to employ nanotubular (NT) titanium dioxide layers in order to develop gas sensors. The NT TiO2 layers have been fabricated by electrochemical anodizing of Ti foil with subsequent dissolution of metal layer. The technique to apply TiO2 NT layer over the substrate equipped with strip coplanar electrodes is developed. It has been found that the TiO2 NTs exhibit a considerable...
Research and development of microwave installation for high-intensity thermal treatment of the mineral raw materials on 50 kW at 915 MHz have been done. The possibility of using the working chamber of the waveguide-transmission type for the creation of efficient microwave installations, high power was shown. Device for sacrifices and movement of minerals in microwave working chamber was developed...
The modern status of the native thermal detectors of laser radiation is shown in the application. The comparison of different types of the thermal detectors of laser radiation. The basic operational parameters of the thermal detectors of laser radiation, their advantages and disadvantages are shown there. Described new possibilities of creating effective multielement sensors, using the materials and...
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...
Propose the adaptive method to improve the accuracy of the control advance angle of ignition of gasoline internal combustion engines (ICE) on indicators intracyclic changes in the angular velocity of the crankshaft, allowing to take into account the uneven distribution of the working mixture in the cylinders and change their technical condition. For the extreme regulator of adaptive control for the...
The paper presents the evaluation of efficiency of class DE power amplifiers (PA) utilizing either series or parallel compensation inductance and operating in the frequency band. Because of substantial dependence of PA mode from operating frequency and load resistance, incomplete recharge of output capacities in transistors occur at high frequencies thus reducing its efficiency. If the problem is...
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...
In this paper we propose a method and instrumentation for the study of the processes of quenching of the triplet states of luminescent probes and for determination of heavy metals in the human serum albumin and bovine serum albumin. The method is based on the quenching by heavy metal ions of phosphorescence of the probes, non-covalently bound to the protein globules. As quenchers we used heavy metal...
We have studied the multigap resonance system, which is a rectangular cavity resonator with two suspended ceramic substrates, on which the two sides is applied by lithography strip line. During modeling process the resonator structure was calculated on three main modes with a maximum characteristic impedance, antiphase oscillation mode (π), π / 2 oscillation mode and in-phase mode (2π) oscillation...
The paper presents the results of numerical simulation of a miniature dual bean monotron with three-gap resonator, made by technology of integrated circuits. Was studied the stability of this device to different oscillation modes. It is shown that when working on main mode output power of the device on the 2,2 GHz is in the range from 150 to 350 watts with the change cathode voltage from 2 to 3,5...
The analysis of the waves properties with complex propagation constants in periodic structures without disturbing the periodicity. The results of the electrodynamics characteristics research of different type structures in the wide range of frequencies are presented. The main attention given to study the phenomena the interaction of the normal waves of periodic structures with formation the stopbands...
A short overview of measuring methods for dielectric constant in SHF range is given. A 3-D numerical simulation of microstrip structure with a central electrode of an interdigital type loaded onto a thick-film material sample was carried out. Resonance frequencies of wavelengths in cm-range depending on dielectric constant of the measured sample were determined. A correlation between resonance frequency...
Modern development trend systems of wireless devices reconnaissance are to magnify operating frequency and expand bandwidth of radar impulses. Acousto-optic Bragg cells are commonly used as message entry device in such systems and thus entire system operation depends on its characteristics. Therefore enhancing performance of acousto-optic Bragg cells is a relevant objective. One the characteristics...
Microplasma microwave sources are widely used in a bio-microelectromechanical sterilization systems, in materials processing, in a microchemical analysis systems. The possibility of ignition of microwave low-power plasma using ring microstrip resonators tuned to the frequency of 900 to 1500 MHz was investigated. We have simulated the ring resonators with microstrip gap size of 100 to 500 microns....
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