Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 1999, No.2
/ Издания академии / Научные журналы
Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 1999, No.2
| Известия Национальной академии наук Беларуси
СЕРИЯ ФИЗИКО-ТЕХНИЧЕСКИХ НАУКИздатель: Беларуская навука, Минск, Республика Беларусь |
Номер 2, 1999
СОДЕРЖАНИЕ
МАТЕРИАЛОВЕДЕНИЕ
Chernous D.A., Shil'ko S.V., Pleskachevskii Yu.M.
Three-dimensional anisotropy model of a porous material. pp. 5--9
Summary: To analyse deformation of the porous material with a concave form of cells the method of structural unit extracting is used and a three-dimensional rod model is developed. The dependence of Poisson's ratio and Young's modulus on the direction of loading is investigated.
Tofpenets R.L., Sokolov Yu.V., Zaluzhnyi G.I., Popok D.A.
Mechanism and kinetics of pore healing in thermocyclic treatment of deposited coatings. pp. 10--13
Summary: The mechanism and kinetic peculiarities of pore healing under heat-cyclic treatment of coatings deposited by plasma spraying are discussed. It is established that the diffusion-dislocation mechanism of pore healing is the most probable one which implies that not only the vacancies and dislocations initiated on apore surface participate in mass transfer but also the dislocations are involved that emerge at the most stressed sites of the matrix. The main role is assigned to the dislocation loops generated by pores at the stresses close to the theoretical strength of the matrix.
Misevich A.V., Pochtennyi A.E.
Electrophysical and sensing properties of thin films of copper phthalocyanine. pp. 14--18
Summary: The method of laser evaporation of metal phthalocyanine thin films is developed. The conductivity, temperature dependence and response to NO2 and NH3 of the laser-evaporated copper phthalocyanine films has been investigated.
НАДЕЖНОСТЬ И ДОЛГОВЕЧНОСТЬ МАШИН
Basalaev V.N., Krasnevskii L.G.
Adaptive control of the hydromechanical transmission of a heavy truck. pp. 19--21
Summary: A mathematical model of adaptive control of hydromechanical transmission of a truck with the help of an onboard electronic computer is presented. This model can be uzed mainly for heavy trucks with hydromechanical transmission.
D'yachenko V.A., D'yachenko O.V., Demidenko S.N., Kostyuchenko V.V.
On shaft torsion with a prescribed anisotropy. pp. 22--27
Summary: The stressed-strained condition of a shaft with a helical groobe is considered. A solution of the problem allows evaluation of the maximum torque which may be transmitted by the shaft without plastic strain, the limiting stress and the angle of torsion at a prescribed torque.
ТЕХНОЛОГИЯ МАШИНОСТРОЕНИЯ
Yashcheritsyn P.I., Makharinskii E.I., Makharinskii Yu.E.
The inheritance of billets errors. pp. 28--30
Summary: Mathematical models and software to simulate the blank error heritage process under different conditions of surface infeed grinding have been developed. The summarised information about the technological heritage process is provided.
Yashcheritsyn P.I., Makharinskii E.I., Makharinskii Yu.E.
Modelling of burns under infeed surface grinding conditions. pp. 31--33
Summary: Mathematical models to define bum characteristics under different conditions of surface infeed grinding have been developed. They permit an analysis of the excess grinding depth over the approved level and of the influence of errors in the grinding parameters on the results of control of the working cycle.
Gurchenko P.S.
Interrupted quenching of the parts of complicated configuration under induction heating. pp. 34--40
Summary: A technology of interrupted cooling under induction hardening of workpieces of complicated configuration has been worked out at the Minsk Automobile Plant. The technology excludes cracks, provides necessary hardness and depth with minimum hardening-induced deformations. After surface heating up to optimal temperatures, cooling by a water sprayer is accomplished in an interrupted way in few stages.
Prushak V.Ya.
Investigation of lateral run-off of the band on a line of the pit conveyer with centering supports. pp. 41--44
Summary: The side run-off of a band on the line of a pit conveyer with centering supports as well as the possibility of improving the self-centering capacity of the linear part of the conveyer have been studied. The band centering by means of special idlers and deflecting rollers restricting the band run-off and transported load spill have been found to be efficient.
Yashcheritsyn P.I., Rakomsin A.P., Sergeev L.E., Galkina I.B., Lehedev V.Ya., Sidorenko M.I.
Intensification of magnetic-abrasive machining by creation of new lubricating-cooling technological means. pp. 45--47
Summary: New compositions of the lubricating-cooling technological means-based on surfactants intended for magnetic-abrasive machining have been developed. These compositions ensure the 1.4--1.7-fold increase of the efficiency as compared to the presently used "SinMA-l" and "SinMA-2".
Malyarenko A.D.
Influence of the tool shape on productivity and precision of finish operations. pp. 48--52
Summary: The results of an experimental study of the influence of the tool shape on the size of a hydrodynamic clearace between the tool and the workpiece, on the precision and efficiency of finish operations of functional optic, surfaces are reported.
РАДИОЭЛЕКТРОНИКА И ПРИБОРОСТРОЕНИЕ
Borisov V.I., Pravotorov Yu.V., Sergeev S.S.
An acoustic wave sensor based on a monomode fibre light guide with induced anisotropy. pp. 53--55
Summary: The acoustic sensor in a monomode optical fiber with anisotropy induced by the mechanical pressure is investigated. It is shown that it possesses larger sensitivity than sensors based on the optical fiber Mach-Zender interferometer.
Andreev A.D., Bel'skii A.M., Borzdov V.M., Valiev A.A., Komarov F.F.
Current saturation parameters in n-channel MOSFETs. pp. 56--58
Summary: It is shown that in MOSFETs with a channel length £1µm or substrate dopant level ³1023m-3 the phenomenon of channel current saturation appears earlier then the channel punch-off. Drain to ohmic currents ratio allows determination of the channel resistance increase. The drain voltage function has been calculated for short-channel devices.
ТЕХНИЧЕСКАЯ КИБЕРНЕТИКА
Kuleshov A.Ya.
Increase of the precision of photometry of half-tone images by the method of direct reading. pp. 59--65
Summary: It is suggested to increase the accuracy of photometry of half-tone images by the method of direct reading using a common tract of videosignal amplification with optical interruption of a light flux by the reference and measuring segments of the field of reading. In relation to the two-beam scheme the accuracy of photometering increases 1.49 times due to decreasing the errors caused by a scatter in the parameters of photoelectric transformers in the measuring and reference branches.
Stepanov V.L.
Failure-stable optimal control of objects on a set of the states of functioning. pp. 66--69
Summary: The problem of synthesis of optimal controls of the objects on a set of functioning states is considered. The structure of a multichannel (in relation to the number of states) control device of static and dynamic objects is obtained.
Samoshkin M.A.
Optimization of the speed of response of the systems of conversion and processing of graphic information. pp. 70--75
Summary: Mathematical models and methods of automatic input and processing of graphic information are developed to increase the speed of response of a system. The problem to minimise the average risk at fixed parameters of the algorithm and noises is solved thus allowing the choice of the domain of optimum thresholds of reading of images.
Rakovich A.G., Svirskii D.N., Kuchinskii S.P.
Modelling of layer-by-layer forming in industrial compact laser systems. III. Analysis of the forming schemes. pp. 76--78
Summary: The technique to choose the most rational scheme of generation of layers outlines in the level-by-level synthesis of the products of complicated form is given.
Sadykhov R.Kh., Tatur M.M., Odinets D.N.
Isolation of unformation-bearing features and the cellular logic-based describtion of an image. pp. 79--83
Summary: The structural-algorithmic model of Cellular Automaton is suggested. Based on this model the task of description of handwritten alphanumeric symbols is solved. The images processed can be of the various size, inclination and thickness of lines.
Ryabova A.N.
Modelling of ecological situations in the zone of highways. pp. 84--88
Summary: The most general parameters of the system of monitoring of menancing ecological situations in the zone of highways are described. A mathematical model for calculation of the ecological safety coefficient is given and allocation of the points of ecological control are substantiated which make it possible to collect the representative ecological information.
МЕХАНИКА
Bashura A.N.
Regularities in rock pressure manifestations on development working junctions. pp. 89--93
Summary: Mine instrumental and geophysical investigations have been carried out in freshly driven workings to define the zones with the maximum stress state. The results obtained allow clear-cut recommendations to be given on peculiarities of supporting junctions in the development workings at a depth 700 to 850 m.
Gladyshev M.T., Sokol'skii A.Yu.
Land-slide motion at different laws of dry friction. pp. 94--97
Summary: Different dry friction laws are discussed as applied to land-slide motion as an example. In each case the results of analytical and numerical studies of the one-dimensional land-slide motion are reported. In numerical calculations, the finite-difference method on moving grids has been employed.
Skoibeda A.T., Gromyko O.V.
Matrix form of the equations for design of the shells with finite transverse shear rigidity. I. Initial relations. pp. 98--102
Summary: Closed shells of revolution made of linearly elastic material with finite transverse shear rigidity are considered. Physical relations describe laminated nonisotropic composite materials and continuous models of regular trusses such as plates and shells. All basic design relations required for studying the stressed-strained state of thin-walled elements of structures at static and thermal loads are obtained in the matrix form.
Skoibeda A.T., Gromyko O.V.
Matrix form of the equations for design of the shells with finite transverse shear rigidity. II. The system of equilibrium equations in displacements and their solution. pp. 103--108.
Summary: Equilibrium equations and all basic physical and geometrical relationships for shells of revolution of the finite transverse shear rigidity relative to displacements are presented. Finite-difference relationships are considered reducing the problem to solving a system of linear algebraic equations. Two variants for boundary conditions are proposed. An algorithm for solving the problems of statics and thermal strain of structure thin-walled elements is given.
Shaginyan A.S., Zakharov A.V.
Dynamics analysis of a hydraulic drive of the vibration sources of seismic waves. pp. 109--114
Summary: The paper presents a dynamic calculation of a hydraulic drive for seismic waves vibration sources. Physical and mathematical models are considered. A calculation of the main dynamic characteristics for pumps with constant outlet pressure of the RNA1D type produced by PA "Hydroprivod" (Snahty, Russia) is made using a mathematical model. The expediency of their application in seismic waves vibration sources is grounded.
ТЕПЛОФИЗИКА, ТЕПЛОЭНЕРГЕТИКА, ТЕПЛОМАССООБМЕН
Borodulya A.V., Dikalenko V.I.†, Pal'chenok G.I., Leckner B., Khansson K.-M., Tullin K.
Kinetics of wood pellet combustion in a fluidized bed. pp. 115--123
Summary: Devolatilization and char combustion of a single wood pellet in a fluidized bed has been studied. The effect of operation parameters (bed temperature, bed particle size, oxygen concentration) and pellet characteristics has been investigated. A simplified analytical model of heat-transfer controlled pyrolysis has been developed to interpret the measured volatiles release time. The model predictions are in a good agreement with the experimental data, provided that the initial physical properties of the pellet are used. The model can be used to estimate the devolatilization times in other combustion systems. Kinetic parameters of char combustion are obtained based on the measured burnout times and simple model considerations. The physical properties of wood pellets need further study.
Bairashevskii B.A.
Specific fuel consumption by consumers of a heat-supply system. pp. 124--129
Summary: A simple analysis has revealed that in combined production the various data on specific fuel consumption and heat and electricity cost can be considered as quantities directly proportional to the tariffs of electricity and heat consumed.
Bairashevskii B.A.
Analysis of the comparative efficiency of heat-supply systems. pp. 130--133
Summary: The simplified method of express-analysis of the efficiency of heat-supply systems is developed in relation to such characteristics as geometric characteristics of the system, absolute heat losses in the systems and heat input in the heat-supply system.
ЯДЕРНАЯ ЭНЕРГЕТИКА
Ostapenya A.P., Sokolik G.A., Pavlyutin A.P., Derengovskaya R.A., Zhukova T.V., Ivanova T.G., Leinova S.L., Duksina V.V., Makarevich T.A., Rubinchik S.Ya.
Distribution of radionuclides between the main components of lake ecosystems. pp. 134--139
Summary: The distribution of radionuclides (137Cs, 90Sr) in the ecosystem of a stratified lake is investigated. It is shown that migration of radionuclides is closely related to functioning of biota.
АННОТАЦИИ ДЕПОНИРОВАННЫХ СТАТЕЙ
Kozhuro L.M., Mrochek Zh.A., Gal'go V.I., Khil'ko D.N.
State-of-the art and prospects of development of the methods of restoration and reinforcement of machine parts with use of welding-on. p. 140
Rodchenko D.A., Tsyrlin M.I.
Thermal resistance of a polymer under high-speed heating. p. 140
Shaturov G.F.
Main trends in development of rotational mechanical machining. p. 141
Shaturov G.F.
Wear resistance of a cutter with a continuously renewable cuttin edge. p. 141
Shaturov G.F.
Machining by a multiedge step-by-step cutter. p. 141
Shaturov G.F.
Influence of the rigidity of a technological system on the precision of shaft machining in a cross section. p. 141
Shaturov G.F.
Influence of the rigidity of a technological system on the precision and productivity of machining. p. 142
Shaturov G.F., Voitov V.V.
Cutting with partial advanced plastic strain. p. 142
Kurbatskii A.N., Cheushev V.A.
Method of synthesis of context models of natural language for document understanding systems. p. 142
УЧЕНЫЕ БЕЛАРУСИ
Анисович Г.А., Астапчик С.А., Мартыненко О.Г. и др.
Зиновий Пинхусович Шульман (К 75-летию со дня рождения). C. 143--144
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ХРОНИКА
Information technologies of designing as the onset of modern production. pp. 145--147
/ Издания академии / Научные журналы / К началу страницы
Разработана и поддерживается Николаем Н. Костюковичем. Последнее обновление: 10 мая 2008 г.
Создана при участии Игнатия И. Корсака
Копирайт © 1999-2008 Национальная академии наук Беларуси
Копирайт © 1999 Издательство "Беларуская навука"
