(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF PHYSICAL-ENGINEERING SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
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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: Method of calculation of coating bond strength with a surface is presented. The examples of the calculation of coating bond strength with shafts, crankshafts, swinging spherical joints are given.
Timoshpolskiy V. I., Samoilovich Yu. A., Goryainov V. A.
Thermal and thermomechanical effects in support rollers of steel continuous casting machines. Part 2. Evaluation of durability of support rollers. pp. 13--18
Summary: An investigation of heat and thermostressed condition of steel support rollers operating in modern slab continuous casting machines was carried out on the base of the mathematical model developed. Distribution patterns of temperature, thermal stresses, and strains in support rollers depending on casting speed and roller dimension were determined.
Komarov O. S., Punpur V. A., Sadovsky V. M.
The model of macrostructure formation of hypoeutectic high-chromium cast irons. pp. 19--23
Summary: The mathematical model of macrostructure formation of hypoeutectic high-chromium cast irons is developed, which makes possible to establish a connection between various technological factors and transcrystallization zone depth in the castings. The analysis of the connection between of the macrostructure and melt state conditions evaluates the causes of transcrystallization stop that is experimentally verified.
Chekan N. M., Gerasimovich Yu. V., Podluzhnyak N. V., Svirin V. T.
Bonding configuration of nitrogen doped tetrahedral amorphous carbon films. pp. 24--28
Summary: The elemental composition and bonding configuration of nitrogen doped tetrahedral amorphous carbon films deposited from ion-assisted pulsed cathodic-arc plasma were studied in detail by the method of X-ray photoelectron spectroscopy. The possibility to make diamond-like films with an adjustable nitrogen content as electrical active donor dopant was shown.
Tofpenets R. L., Anisovich A. G., Vasilieva L. A.
Structure and property investigations of BRB2 bronze after its subjecting to thermal cycling. pp. 29--32
Summary: The consideration has been made of transforming the structure and properties of BRB2 beryllium bronze during a high temperature thermal cycling within the temperature ranges from 800 °C to 700 °C and 800 °C to 20 °C with subsequent ageing. The degrees of micro- and sub-structure dispersity and homogeneity are shown to decrease. The structure transformation ensures obtaining an increased complex of mechanical properties such as hardness, ultimate strength, plasticity and elastic strength.
Summary: Bending of sandwich plate with light polymeric filler lying on elastic foundation is considered. For the description of kinematics of package with asymmetrical thickness the broken normal hypothesis was accepted. Reaction of foundation was described on the base of Winkler's model. The loading was arbitrary, symmetric. Combined equations of equilibrium and analytical solutions via displacement were received. Numerical solutions for sandwich metal-polymeric plate were adduced.
Vasiliev G. M., Dragun V. L., Mandel N. L.
The perspective technologies of processing of milk and other liquid foodstuff. pp. 38--41
Summary: Is shown that the technology of processing is high voltage by pulses of sub-microsecond duration allows to make processing of liquids, liquid foodstuff (water, milk, the wine and wine materials, fruit and vegetable juices etc.) and provides a high level of the savings of energy, high specific productivity and high competitiveness.
Zhuravkov M. A., Pavlov S. V.
Modelling of macrocracks behaviour in a vicinity of underground structures. Part 2. Estimation of rock mass state with irregular system of cracks. pp. 42--47
Summary: The problem of the estimation of stress intensity factor for two arbitrary arranged cracks in case of single-axis loading with use of method of sections is resolved. On the basis of the solution to this problem the model of the behavior of cracks system in rock mass is built.
Dubrovski A. A.
To the question on plastic deformation of the cut off layer. Part 3. Cutting in conditions of adhesion of contact surfaces. pp. 48--54
Summary: The definition of a conditional corner of shift and corner of the valid shift in conditions of contact surfaces sticking is made under the formulas found for conditions of only external friction. Only instead of an average corner of friction in the formulas use the valid corner of friction. Thus the valid comer of friction is less than an average corner of friction. The reduction of an average corner of friction is taken into account with the help of coefficient, smaller unity and having different meaning for various conditions of friction or kinds of contact interaction. In conditions of the mixed friction the size of coefficient is inconstant, and in conditions complete sticking is constant.
Mikhasev G. I., Nikonova T. V.
The estimation of forces within a thin wall corrugated pipe with elastic filler under variable pressure. pp. 55--60
Summary: On the basis of the membrane shell theory equations, using the asymptotic multiple- scale method, the hoop stresses in the long length thin corrugated pipe with elastic filler has been found taking into account a variable hydrostatic pressure.
Kamko A. I., Chourinov V. A.
Development of methods for account of longitudinal and cross field copying mechanisms for cutter of combine harvester. pp. 61--69
Summary: The basic types of automatic field relief copying mechanisms by a catter of a combine harvester are considered. Main conditions for selection of loads on copying pads are determined and opportunity for guaranteeing a satisfactory capacity for work of a hinged-lever mechanism with a balancing spring for copying by catter of the field relief with depth and step of sine wave form macroasperity up to 0.25 m and 0.5 m is proven. On the basis of the principle of virtual movings the problem of to choice of rational parameters of balancing mechanisms is solved and computer program for account is created.
Summary: The problem of thermal field determination in anisotropic elliptical plate is considered. The area for solution solving maps in a non-conformal way on a circle, then the method of compressed images is applied.
Ivanov E. M., Ivashko V. S., Buikus K. V., Hetsko V. V.
The analysis of heat-exchange processes at thermal spraying. Convective heat-exchange. pp. 76--82
Summary: Heat-exchange between gas flow and particle in spraying process proceed in conditions of non-isothermal process, therefore values of heat emission coefficient and Nusselt's count are variable. Theoretic analysis of account methods of values of heat emission coefficient and Nusselt's count are carried out. Two limit case of heat-exchange are viewed: heat-exchange in area very small times (t ® 0) and stationary case (t ® µ).
Bayrashevsky B. A.
The stabilization of heating and hydraulic regimes of heat networks. pp. 83--86
Summary: The principle possibility of functioning the heating supply system with constant importance a temperature and mass consumption energy flows in broad range a temperature a medicine to be taken externally an air is considered. Within object heating supply is provided the qualitative method of regulation a temperature heating with constant consumption circulating water. Given result of approximate calculations in the manner of output tabulation PC for range a temperature a medicine to be taken externally an air from -25 °C before 2.5 °C.
Yakushau A. P., Nikitsin S. N.
The analysis of development scenarios of electricity generation system of Belarus. pp. 87--95
Summary: The analysis results of different development scenarios for electricity generation system of Belarus using software package WASP-I1I Plus are given. Calculations were carried out for scenario based only on construction of new natural gas power plants, for scenario providing construction of nuclear power station, and for scenario providing construction wind power stations. It was shown, that with given forecast for the natural gas and petroleum prices, is the scenario providing construction of nuclear power station is the most economically profitable. Scenario providing construction of wind power stations is also economically profitable but in a lesser degree.
Summary: The algorithm of grayscale images segmentations, which uses the fields growth method, is proposed. The scenarios of fields pair unions with performance and segmentation quality evaluation are described. The method of segmentation threshold choosing is presented, which provides results near to expert partitioning. The results of algorithm execution for Earth surface images are presented.
Summary: The formation of reliable ohmic contacts to (111) Si n+ - (emitter transistor) and p+ -type (base transistor) is considered. It is shown that both the photon pulsed annealing and the stationary vacuum annealing reconstructs the surface of (111) Si, covered by the silicon dioxide in the contact windows and provides intimate metal-semiconductor contact and the low values of Re-b,Re, tc and the high values of Pout, Gp parameters of microwave transistors.
Dzisiak A. B.
Experimental investigation of microwave noise meter. pp. 104--114
Summary: Theoretical and experimental research of microwave noise meter calibration unit using modulation method are carried out. Parameters of the basic functional devices of calibration unit are determined. Conditions of amplitude and frequency modulation formations for input microwave signal are determined. Influences of the frequency modulation, modulation components attenuation and full input signal attenuation on the value of amplitude modulation coefficient and frequency modulation index are experimentally investigated. It is shown that accuracy of calibration microwave signal formation, hence and accuracy of microwave noise meter calibration, is determined by accuracy of amplitude modulation coefficient definition with the help of spectral methods. Three various methods of amplitude detector form-factor a were investigated: using voltage-current characteristic of diode, using diode constant voltage dependence on input signal power, and modulation method with using microwave noise meter and calibration unit. Comparison of these three methods of factor a definition has shown, that in the big signals area the field measurement results will be well coordinated. At low signals field (£4 <50 MB) measurement results quickly diverge, but general type of dependences is preserved. Thus, at amplitude noise measurement it is necessary to provide microwave input signal power level to be in the field which corresponds to the diode constant voltage not less than 100 MV. For two calibration methods the research of metrology parameters of microwave signal amplitude, frequency and insertion phase noise meter are carried out. The measuring error is determined by installation and measurement error of spectral methods of modulation parameter for microwave calibration signal. Use of the offered calibration unit allows practically to remove error dependent on analyzing frequency, and to reduce error dependent on value of an input signal. Also the sensitivity of three kinds of noise of microwave signal measurements with the help of a designed meter MNM 78-118 are determined.
Komarov F. F., Kamyshan A. S., Lagutin A. E.
Modernization of the electrostatic accelerator ESA-2 used for fundamental and applied investigations. pp. 115--120
Summary: The directions of indispensable modernization of the Van de Graaff electrostatic accelerator ESA-2 are indicated. Design and results of reconstruction of the electrostatic accelerator are described and discussed. The ion source constructed is described too. Design of the new acceleration tube with flat electrodes was investigated. There are many characteristics for the electrostatic accelerator tube presented. The main attention was paid to the upgrading of the charging system. There are many characteristics for the electrostatic accelerator charging belt discussed as well.
Summary: Using uranium-236 as the tracer of "Chernobyl" uranium the average depths of burning out of fuel in depositions on separate platforms of northern and western radioactive traces of 30-km of zone Chernobyl NPP are determined. It is shown, that in 30-km to zone Chernobyl NPP the average burning out of fuel is (9.4 ± 0.5) MW.d/kgU. This value is lower than average calculated burning out of fuel by 17% in AZ 4-th block Chernobyl NPP at the moment of accident.
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