The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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 method of calculation of the temperature distribution in the dielectric material for the traveling wave microwave devices is presented. The basic equations for the temperature distribution in the direction of the electromagnetic field energy propagation with considering the dependence of the dielectric parameters of a material on the temperature changes and taking into account the heat transfer...
Formulated mathematical model and the developed finite-difference method and computer program that enables the effective exercise of computer modeling and optimization of high-speed processes of thawing of soils with the help of the magnetrons. As the primary modeling method used a variant of end-to-end “enthalpy” method without smoothing concentrated heat capacity. Implemented a series of informative...
The article describes the work of a pulsed electromagnetic linear engine according on each of the seven energy regimes. Each of the modes differs to extent of restoration of magnetic energy at the movement of an anchor of the engine. To this end, ranges of magnetic energy recovery coefficient, defining the boundaries of energy regimes have been established. The analytical method has received the generalized...
The paper describes an approach to designing a fluorescent multiprobe array to detect the presence of heavy metals (HM) in the solutions. As a result of the selection of sensors the fluorescent probes — xanthene dyes, acridine and thiazine series have been selected to collect the array. Variations of the maximum values of probe fluorescence intensity have been employed as the analytical parameters...
The paper is concerned sources of terahertz radiation different power. The paper dwells upon field of application of these sources. The authors gave a comprehensive analysis of powerful sources of terahertz radiation, sources of terahertz radiation of average power and sources of terahertz radiation of low power. In this paper the authors showed advantages and disadvantages of these sources. The authors...
The report is focused on improving a productivity and quality of welding seams. The seams was obtained by thermal diffusion welding under vacuum conditions on a modern installation UDSR — 200/250 — 1150/100 and used in producing of units of vacuum tubes. We described methods of examining the quality of welded connections such as: copper — constantan — copper, copper — ceramics VK94-1 — copper and...
The basic theoretical and practical provisions necessary for the development of high-quality solid-state uncooled microbolometer arrays detectors of infrared radiation in this article. The state and prospects of development of microbolometer arrays on MEMS technology. The information about the microbolometer arrays developed by MEMS technology. The comparative characteristic arrays receivers of foreign...
The article describes the principle of the simulation of microwave drying of dielectrics by the method of equivalent circuits. The mathematical model of the kinetics of the energy and mass transfer in the microwave drying of dielectrics was described. The equivalent circuits simulating the heat and mass transfer was shows. The mathematical simulation results of microwave drying of wood in periodic...
The intensity distribution of the field along the symmetry axis of the dielectric — loaded groove waveguide (GW) for two variants of the injection into it of the microwave energy excitation of two counter-traveling waves and for the case of additive to feed him energy from the upper-trough are considered and experimentally investigated. It is shown, that the microwave energy injection from the upper...
As a method of formation of hierarchical structure of fillers of the waveguide paths of microwave devices it is offered to use additive technologies. Researches of influence of the microwave oven of an electromagnetic field of various specific power on strength characteristics of objects are made of the powder materials created by 3D press. It is established that the microwave oven an electromagnetic...
This article explores the illumination dependent on the distance between the elements of the LED array. Study the illumination depending on the distance was made between the LED array elements at different distances from the source. For this experiment scheme and laboratory equipment has been developed. A mathematical model of illumination from different types of LEDs using the computer system Origin...
This article considers the problem of ensure of the effective electron devices engineering based on the links between the process design of machining and assemblage. The structure of the complex approach (complex of the design procedures) taking into account this links and real manufacturing situation is formed. Also, analyzes of the possible algorithms of realization of the complex approach (complex...
Many devices need DC source with low ripple for normal operation. Three-phase bridge rectifiers are most commonly used as the base unit in the source. A simulation model built in MATLAB/SIMULINK is used to analyze the operating of DC source under unbalance mains. The simulation results characterize quality of output voltage versus unbalance of phase voltage.
Induction heating is one of the promising methods of thermal treatment of metals. Thyristor frequency converters that are complex and expensive electrical products are used as power sources of induction heaters. Information about the currents and voltages of the circuit elements is extremely important during the planning stage of frequency converter. Developed a simulation model of thyristor frequency...
Known designs direct traction drive does not completely solve the problem of a significant increase in the reliability and durability of the wheel-motor unit because they contain parts subject to wear and failures in service (bearings for the axle to compensate for the clutch), the replacement of which may require the dissolution of the wheel pair. The design of the direct drive traction to the rotor...
The finite element method for simulation eigenmodes of the gyrotron cavity is presented. Weak form of the boundary value problem based on the penalty function method is obtained. For the numerical simulations, Comsol Multiphysics software package is used. Field profiles, cold frequencies, and Q-factors for several cavity eigenmodes are calculated. The results are compared with the cross-sections method,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.