(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF PHYSICAL-ENGINEERING SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
| Proceedings of the National Academy of Sciences of Belarus (Vestsi Natsiyanalnai Akademii Navuk Belarusi) SERIES OF PHYSICAL-ENGINEERING SCIENCES Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Summary: Studied is the nature of surface of Ni-coatings generated during electrochemical deposition on substrates of cooper and kovar with stimulating laser irradiation. Also, analyzed are the effects of laser pulse parameters upon the process of formation of Ni-coatings and their structural peculiarities, upon conductivity and upon the strength of adhesion with substrate.
Zhemchuzhny M. I., Dubinsky N. A.
Theoretical definition for porosity of composite materials generated by electrochemical methods. pp. 9--10
Summary: A mathematical model for determination of porosity of composite materials has been developed. The suggested model gives a possibility to estimate the galvanic coating characteristics that agree well with the experimental data.
Belotserkovsky M. A.
Activated flame spraying of wire material. pp. 11--15
Summary: A new equipment for wire flame spraying is presented. Dynamic and thermo-physical parameters of the spraying process are investigated.
Vityaz P. A., Shelekhina V. M., Prokhorov O. A., Gaponenko N. V.
Production of pseudocrystalline materials on basis of silica. pp. 16--20
Summary: Presented are the results of investigation in the field of silicon oxide powder synthesis and formation of pseudocrystalline structures on their basis, showing spectral-selective characteristics in an optical spectrum area.
Komarov O. S., Korolev V. M., Melnichenko V. V., Komarov D. O.
Theoretical and experimental basics of formation of shrinkage porosity in eutectic alloys. Part 1: Physical and mathematical model. pp. 21--23
Summary: A physical model of porosity formation is developed for the eutectic type alloys, that do not have a tendency to dissolve large amounts of hydrogen. Assuming that porosity occurs as a result of liquid deficit into the intergrane volumes after intergrowth of eutectic cells and shortage of melt filtration. Mathematical model is based on the physical model and allows to evaluate influence of such factors as casting thickness, hydrostatic pressure, temperature interval of crystallization, mold initial temperature, temperature of pouring alloy, melt dynamic viscosity, coefficient of filtration through two phase zone upon magnitude and location of porosity zone.
Summary: In this paper, models of the amplitude-modulated and phase modulated vibration signal in the cycloidal gearing of the planetary-cogged reduction gear box are presented. The frequencies for trjuble shooting in the cycloidal gearing are obtained.
Boyko L. I., Goman A. M., Rakova N. L.
Development of high-performance low energy consumption self-oscillation drives of oscillating machine working parts. pp. 27--30
Summary: A classification of self-oscillating systems is provided in this paper. It is shown that conditions for onset of self-oscillations in drives with oscillating working parts are defined by engine characteristics and dependence of resistance force on working part velocity. The methodology of design of drives with self-oscillating motion of working parts is developed.
Summary: The performances and features of use of different types of traction electric motors (ÒÅÌ) for urban electric transport are analyzed. On the basis of the analysis, the technique of choice of ÒÅÌ for trolleybuses including definition of power of a motor considering recommendations provided is stated.
Astapchik S. A.
High-energy material processing methods (laser, electric erosion, magnetic field, high-pressure water stream, electrothermics). pp. 39--48
Summary: The review paper describes issues of up-to-date high technologies which are combined considering the principle of a high specific capacity of power consumption and short-time exposure. They include laser and electroerosion technologies, magnetic-pulse stamping, processing by means of high-pressure liquid stream and electrothermics. The discussion is made of the technologies rather well mastered by machine-building enterprises and the development of which is directly associated with the activity of the Physical-Technical Institute of NAS of Belarus (patents, know-how, State Premiums, etc.). They are in demand and very promising for industrial introduction.
Summary: The research work contains the analysis of the reflective characteristics of a hydrocarbon deposit in two-frequency interaction mode. According to this analysis, there are recommendations on the elaboration of radio search and identification systems for hydrocarbon deposits in two-frequency interaction mode.
Aksenchyk A. V.
Modelling effective irregular multisectional coupled-cavity TWT. pp. 55--63
Summary: On the basis of equivalent six-poles, the mathematical model of the analysis and synthesis of irregular multisectional coupled-cavity TWT is developed. The nonlinear relativistic equations of motion are used. Back rediation is taken into account. The results of optimization are presented. It is shown that in irregular three-sectional coupled-cavity TWT, the electronic efficiency is as high as 60%, and gain factor is as high as 35 dB. The features of formation of frequency characteristics of irregular multisectional TWT are mentioned.
Summary: A general method for automatic feature recognition from boundary representations of the solid models is suggested. The method is based on decomposition of the object by means of syntactical relationships analysis between volumetric components and following mapping syntactical structure of the object onto semantic level.
Prytkov V. A., Sadykhov R. Kh., Tatur M. M.
Cellular automaton structure for image compression task solution. pp. 73--76
Summary: A new structure of cellular automaton is proposed. This structure, based on emulation of the necessary global connections by the "transit" mode, allows to solve effectively most problems for image compression. It also can be used for self-testing organization of the cellular automaton.
Summary: A solution of the flat dynamic problem of bar fabrics extrusion taking into account inertia force action is provided by the upper bound method. The optimization of the solution with the help of research for the capacity functional extremum of their own resistance forces and finding optimal field parameters providing process with minimal load on puncheon has been carried out.
Chernysh N. K.
Method of forecasting of metering characteristic of hydrocyclone. pp. 82--88
Summary: A method proposed is based on ideal hydrocyclone model. It is shown that in some cases, its characteristics are similar to analogous characteristics of real hydrocyclone. The obtained results are in good accordance with the experimental data.
Nevzorova A. B., Zhogal S. I., Skoybeda A. T.
Analysis of influence of wood moisture on its strength properties by means of statistical methods. pp. 89--92
Summary: By method of dispersive analysis, influence of humidity of wood on its strength properties is investigated. The constructed mathematical model explains features of behavior of wood products of the appropriate levels developed of humidity at their deformation into cylindrical shells and allows to make rational decisions on optimization of technological process of manufacturing of bearings on the basis of wood.
Summary: Thermostrain interaction between casting and metal mould has been investigated. Mathematical models have been developed, algorithms of solutions have been executed on a PC.
Samoilovich Yu. A., Timoshpolsky V. I., Anisovich G. A., Trusova I. A.
Calculation analysis of carbon axial segregation in steel ingot. pp. 96--101
Summary: A mathematical model of a steel ingot solidification including a complex of thermal conduction equations, phase transfer, and convection diffusion of admixtures is suggested. The authors give examples of a numeric realization of the complex mathematical model illustrating the possibility of prediction of an admixture distribution during an ingot solidification process with a short-cut method of evaluation of smelt stirring using an effective coefficient of admixture diffusion in a liquid phase.
Aristarkhov D. V., Sychevsky V. A.
Steam thermolysis of rubber waste. pp. 102--108
Summary: Theoretical and experimental researches of vapor thermolysis of rubber wastes was executed. The mathematical model of researched process is submitted which takes into account condensation vapor in volume back filling and phase transitions connected to evaporation of water and decomposition rubber wastes at heating. On its basis the numerical account of heat and mass exchange of parameters is carried out. The received calculating results are coordinated to the experimental data received from experimental researches.
Dragun V. L., Danilova-Tretiak S. M.
Thermometry in biomedical researches. pp. 109--114
Summary: The review of literature (1995--2001) concerning the temperature measurements methods in biology and medicine is represented. The most popular among them is thermometry due to own IR or SHF radiation of biological tissues. The pyrometry is proposed and used to check the temperature of human skin under physiotherapeutic effect.
Summary: A comparison of different methods of conditional distribution of fuel for generation of thermal and electrical energy at combined heat power plants has been made. The physical method gives logical ratio of cost prices for fuel, heat, and electrical energy and it best meets the conditions of the managed economy in Belarus.
 Academy |