Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 1999, No.3
/ Издания академии / Научные журналы
Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 1999, No.3
| Известия Национальной академии наук Беларуси
СЕРИЯ ФИЗИКО-ТЕХНИЧЕСКИХ НАУКИздатель: Беларуская навука, Минск, Республика Беларусь |
Номер 3, 1999
СОДЕРЖАНИЕ
МАТЕРИАЛОВЕДЕНИЕ
Starikov S.V.
The model of grain-boundary creep under ultraplastic deformation. pp. 5--8
Summary: Grain-boundary creep under ultraplastic deformation is shown as dislocation translation on the graph of grain center relations.
Leontyev A.V., Ostretsov E.F.
The electrophysical properties of organic materials, bombarded by accelerated ions. pp. 9--13
Summary: The results of investigation of ion irradiation influence on electrophysical properties of thin films of photoresist FP-383 are presented. It is shown that in low-temperature field the conductivity of implanted films may be described on the basis of Mott's notion. "Graphite-like" material obtained by ion bombardment can be used as working element for cryogenic sensors of temperature.
Tolkach O.Ya., Prokopchuk N.R.
The changes in structure and parameters of destruction of polyethylene during photo aging. pp. 14--18
Summary: It is shown that the activation energy of the thermal oxidation destruction of polyethylene is sensitive to all processes which take place with material as a result of exposing it with UV-radiation. So this parameter can be used as the criterion for the forecasting of polyethylene durability.
Komarov A.F., Komarov F.F., Shukan A.L., Zhukovski P., Karvat Ch.
The Monte-Carlo method simulation of high-dose ion implantation into solid target. pp. 19--23
Summary: A theory and a physico-mathematical model of the process of high-dose ion implantation was developed in the framework of this paper. The model, involved, allows to take into account the following effects: sputtering of the target surface by ion beam, scattering of being implanted ions on the impurity atoms introduced at the earlier stages as well as the target swelling. Monte-Carlo method was used in the developed approach as a basis for simulation of ion implantation process into crystals.
Tsarik S. V.
The obtaining of time-dependent properties of materials with elastic after-effect. pp. 24--27
Summary: The indentation of rigid indenter with spherical tip into viscoelastic material during impact loading is studied. According to adopted mechanical model of viscoelastic material, characterized by constant value of the damping loss, the calculation procedure of material's relaxation function is presented. The proposed procedure was used to determine the relaxation functions of rubbers with different percentage of plasticizer.
НАДЕЖНОСТЬ И ДОЛГОВЕЧНОСТЬ МАШИН
Shaginyan A.S., Bolotsky V.V., Andrianov D.N.
The analytical investigations of electrohydraulic converter amplifier. pp. 28--30
Summary: Dynamic characteristics of electrohydraulic converter amplifier of "spool-spool" type with zero and negative openings in the spool middle position are considered in the paper. Main dynamic characteristics of electrohydraulic converter amplifier with 2 types of spool's covers were calculated with the help of the mathematical model described in the paper.
ТЕХНОЛОГИЯ МАШИНОСТРОЕНИЯ
Pashkevich M.F.
The calculation of workpieces setting errors at the metal cutting tools. pp. 31--37
Summary: The new technique of setting error calculation of the workpieces durung their machining with metal-cutting tools has been reported. This very methodics possesses interchangeability and it does not demand for conformation of the real setting-up schemes of the workpieces on metal-cutting eguipment to the theoretical locating charts.
Zdor G.N., Zhuravskii A.Yu., Petrakovsky V.S.
The estimation of formability of tubular billets under impact molding. pp. 38--41
Summary: The method described in the paper is used for estimating of formability of tubular billets under the action of an impact loading. The relationships between a specific impact energy and some relative geometrical dimensions of a billet being deformed in order to obtain a necessary part are given.
Nikonchuk A.N., Skoibeda A.T., Bakhanovich A.G., Nikonchuk I.N., Kosyrev I.A.
The longitudinal rigidity of transmission belts under dynamic load. pp. 42--46
Summary: The basic results of researches of longitudinal rigidity of belts which is an analogue of the modulus of elasticity of the first sort, based on the newly developed technique, most fully simulating the conditions of load of belts in real transfers are presented. The technique includes complex research of longitudinal rigidity in conditions of the free and compelled fluctuations with given power and frequency in parameters. The obtained dependences allow to predict value of rigidity in a range of operational frequencies and loadings, which largely depends on the frequency of compelled load with 44 Hz it exceeds the static parameters by 1.6--2.1 times. The similar results allow to modify the basic tasks arising with design of the belts transmissions.
РАДИОЭЛЕКТРОНИКА И ПРИБОРОСТРОЕНИЕ
Kundas S.P., Tyavlovsky M.D.
The investigation and simulation of winding process of flat wire spirals from refractory metals and alloys under ultrasound action. pp. 47--55
Summary: Ultrasonic technology and equipment for winding of flat wire spirals used in electron tubes are developed. Computer and experimental research of winding process of spirals from molybdenum is conducted. The influence of technological parameters of winding on force characteristics and accuracy of spirals is determined.
Narkun Z.M.
The calculation of electrical capacitance of a system of elliptic wires and wafers at presence of a conductive plane. pp. 56--60
Summary: A method is proposed for calculating an electrical capacitance of a system of elliptic wires at the presence of a conducting plane. The method is based on precise constructing the electrostatic field potential. An algorithm for deriving approximate formulae is presented. Some particular cases are considered.
Chabanenko V.A.
The minimization of choice dissipation parameters. pp. 61--63
Summary: Fisher information for the evaluation of choice dissipation parametres is minimized. General solution of the problem by using variational calculus methods is obtained. Extreme distributions corresponding to different correlations between absolute moments of even and odd oders are given.
Korshunov F.P., Kurilovich N.F., Prokhorenko T.A.
The investigation of doze and temperature dependencies of Hall voltage in fast electron irradiated n-type GaAs crystals. pp. 64--67
Summary: It is established, that in 4 MeV electron irradiated undoped n-type GaAs crystals the Hall voltage UH have increasing exponential doze dependence. The exponential coefficient value depends on temperature of UH dose dependence measurements and grows with its downturn.
The UH temperature dependence amplifies with irradiation doze growth.The strong temperature sensitivity of UH after irradiation of researched crystals by electron dozes more than 2 • 1015 sm-2 is found out.
All UH changes after an irradiation are caused by carrier concentration changes as a result of radiation defects introduction in crystals during irradiation.
ТЕХНИЧЕСКАЯ КИБЕРНЕТИКА
Khatsirevich V.G., Yarmosh N.A., Kuleshov A.Ya.
The modeling of the electron class board, designed by the method of amplitude-impulse current modulation of coordinate elements. pp. 68--74
Summary: The method of encoding of the coordinates in the graphic data (CGD) wich is dedicated to the formation of class "electron" board (CEB) of big format is given here. This method is based on the amplitude-impulse current modulation in the coordinate elements of the positional-sensitive electromagnetical searching system (PSESS) of CEB. The mathematical models to evaluate the parameters of the elements of the PSESS, where the error in the linear transformation CGD is taken into account, are analysed.
Kuleshov A.Ya.
The automatic classification of objects of gray-scale images on the basis of boundary points correlation. pp. 75--80
Summary: Automatic classification of objects of gray-scale images on the basis of correlation of boundary points which are subjected to linear smothing by the method of the moving average is offered. The experimental results of determination of the similarilty measure of the contour representation of gray-scale image objects with different number of boundary points of the smoothing interval are presented.
Samoshkin M.A.
The programming of machining of three-dimensional asymmetrical parts. pp. 81--83
Summary: Mathematical models of functional dependence between the movement of milling cutter centre on the one hand, geometrical parameters of three -- dimensional object, tool and submission of preparation - with other are created. It is shown, that the estimation of accuracy of processing can be made on shaft of a deflection, the size of which should not exceed the radius-vector tolerance. Theoretical investigations alloved to deduce the eguation for forecasting cleanliness and accuracy of processing of three-dimensional object.
Polyakov A.S.
The distribution of fragments of sequential programs among the distributed system processors. pp. 84--88
Summary: The algorithm for assignment of sequential programs parallel fragments among distributed system processors is suggested. This algorithm takes into account the results of allocation of previous parallel fragments therefore the number of parallel fragments dublication is decreased. Keywords: distributed systems, sequential programs, parallel fragments, programs partitioning.
Dolgii A.B.
On the probability model of renewal systems. pp. 89--92
Summary: A renewal process model is studed. Several applications of this model exist, performance analysis of production systems or computer systems, for instance. An error in existing models is proved. A modified formula and numerical example are given.
МЕХАНИКА
Bodyako S.F., Novik G.M., Pobitko A.I., Salnikov L.I.
The estimation of ultrasonic waves acoustic displacement value in metals under the effect of electronic high-current beams. pp. 93--95
Summary: The value of acoustic displacement of ultrasonic waves allows to evaluate compression of medium under effect of radiation. Researches have shown, that at account of value of acoustic displacement under effect of electronic beams it is necessary to take into account the contribution of all electrons of a beam, zone of their interaction with a material of a target. The indicated technique makes possible to evaluate the value of acoustic displacement of ultrasonic fluctuations for targets of the final and half-infinite sizes.
Bosakov S.V.
The Ritz's method for contact problems of elasticity theory. Plane problem. pp. 96--104
Summary: In the paper an approach for solution of plane conract problems based on Ritz's metod is presented.
Kudryavtsev I.A.
The influence of vibrations in grounds on the change in their damping properties. pp. 105--107
Summary: The change of damping properties of soils with the presence of wave processes in the soil has been revealed. The supposition about the existence of the volumetric deformations in the soils at different levels of vibrations has been introduced.
Dokukova N.A., Martynenko M.D.
The linearization method and it's usage for the analysis of nonlinear oscillating systems. pp. 108--111
Summary: The new method of an equivalent linearization for a numerically-analytical research of nonlinear oscillatory processes is offered. This method has proved its efficiency in practice realization of engineering accounts. The conditions of an auto oscillations exiting in mechanical systems are founded.
Chigarev A.V., Kusmitsky A.V.
The simulation of a self-oscillation of the contact between gudgeon and vehicle wheel bearing. pp. 112--117
Summary: If is found that the necessary condition of rolling process is angular displacement of zone (point) contact between gudgeon and wheel. The trajectory of contact point movement is a cycloide. The offered model determines the ways of decreasing of consumed energy, tyres wear and their noise.
Rabtsevich A.V.
The elastic modulus measurement of metal by dynamic indentation method. pp. 118--122
Summary: The analysis of elastic modulus determination of metallic materials by indentation methods is performed. It is shown that the elastic modulus can be characterized in a best way with the slope of the curve contact force vs. elastic displacement at initiate stages of unloading and the amount of reached plastic strain.
ТЕПЛОФИЗИКА, ТЕПЛОЭНЕРГЕТИКА, ТЕПЛОМАССООБМЕН
Zavistovsky V.E., Domoratsky V.V.
The model of a liquid emulsion droplet heating and vaporizing. pp. 123--127
Summary: A model of bursting process of a droplet of liquid emulsion during its combustion in the boiler's furnace is presented. The main feature of the model is that it admits more than one drop burst. Numerical experiments are carried out to illustrate the process of drop burst for various parameter values. The ways of improvement of the precision of the model are discussed.
Kashevsky B.E.
The dipole-glass conversion in superparamagnetic systems. pp. 128--134
Summary: The possibility of the dipole-glass state in systems of interacting isotropic superparamagnetic particles suspended in solid or liquid matrices is investigated. A numerical model of self-consistent field is developed, in which the magnetic state of particles is represented by active magnetic dipoles governed by Boltzmann statistics in local field. Brownian dynamic simulation is used to describe translational motion of particles. It is shown that above some value of the interaction energy to thermal energy ratio, the paramagnetic state becomes unstable and progressive freezing of magnetic moments appears accompanied by a peak on the temperature variation of susceptibility.
Khaustov V.M.
The heat transfer during condensation in heat gravity pipe. pp. 135--140
Summary: The results of theoretical investigation for heat transfer during condensation of immovable vapour on a flat plate surface covered with porous structure are presented. By means of these results heat transfer parameters of a heat pipe in which the working fluid circulates by gravity are theoretically determined. Such a heat pipe generally contains surplus fluid beyond the porous volume of the wick. The results of calculations and experimental data show satisfactory agreement.
ЯДЕРНАЯ ЭНЕРГЕТИКА
Kolykhan L.I., Klimenkov Yu.V., Golubnichy Yu.A., Vorob'ev V.V., Nekrashevich V.A., Molchanov I.V., Falkovsky L.N.
The experimental investigations of aerodynamic performances of the air path of a passive system of nuclear pile accidental cooling. pp. 141--145
Summary: The investigations of aerodynamic performances of the elements of an air path have been carried out at an experimental plant modeling a passive system of an accidental cooling. The values of aerodynamic coefficients of the deflector (KD = 0.665 ±0.109), the collector (KK = 0.27 ±0.06) and the air path have been obtained. It is shown that the air cooling system with common collector and deflector provides with a stable operation of loops under consumption diversity of less than 20% for all investigated regimes.
АННОТАЦИИ ДЕПОНИРОВАННЫХ СТАТЕЙ
Ivanov I.A.
The investigation of heat fastness of steels and alloys with vacuum electric are coating. p. 146
Ivanov I.A.
Structure formation of vacuum electric arc coatings of titanium--silicon. p. 146
Chernyavskaya S.V.
Two flat problems of finite strains of a half-linear material. p. 146
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Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: November 17, 1999
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 1999 The National Academy of Sciences of Belarus
Copyright © 1999 The Belaruskaya Navuka Publishing House
