Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 2003, No.1 / Издания академии / Научные журналы
Известия Нац. академии наук Беларуси. Сер. физ.-техн. наук, 2003, No.1
|Известия Национальной академии наук Беларуси
СЕРИЯ ФИЗИКО-ТЕХНИЧЕСКИХ НАУК
Издатель: Беларуская навука, Минск, Республика Беларусь
Номер 1, 2003
Sedlyarova S. N., Eliseeva I. M.
Structural transformations in resins at their aging in fuel.
Summary: The analysis of experimental data testifies that the surface layers of rubber are subjected most heavily to aging in fuel. The rate of their structural transformations is reduced at modification of a surface layer by sulphureous combinations.
Prushak V. Ya., Dovnar D. N.
3-dimentional meshy structure forming of oxirane polymers at polymeric and inorganic modifiers addition. pp. 8--11
Summary: The research results of epoxy coatings, modified with polymers and inorganic additions are presented. It is shown that creation of filling conpound's self 3-dimentional structure allows to obtain polymers with required physical-mechanical properties.
Kravtsov A. G.
Correlation between electret and magnetic properties of polymeric composite fibrous materials, obtained by aerodynamic dispersion of melt. pp. 12--15
Summary: Some physical properties of polymeric fibrous materials filled by ferrite were investigated. It is established, that a filling degree, intensity of electric field, direction of magnetization influences on magnetic and electret characteristics. It is marked, that the spontaneous electret charge of samples, which is caused by features of technological process of fibers formation, is maximal at filling degree of ferrite at 15 weights% and minimal at 25 weights%. The assumption is stated, that there is interrelation between the magnetic field created by composite material and spontaneous electret state.
Rudnitskii V. A., Minchenya V. V.
Estimation of the scale effect influence on determination of the thin metallic coatings microhardness by the dynamic indentation method. pp. 16--20
Summary: Microhardness dynamic indentation of materials causes the indentation size effects appearance. Thus, mentioned factor is analyzed in application to the dynamic hardness testing of chrome coatings from the point of the dislocation theory of plastic deformation.
Vityaz P. A., Talako T. L., Belyaev A. V., Okatova G. P., Letsko A. I.
On the effect of mechanical activation of charge mixture on the phase and structure formation processes during self-propagating high-temperature synthesis of barium hexaferrite. pp. 21--27
Summary: The effect of mechanical activation of charge mixture on the phase and structure formation processes during self-propagating high-temperature synthesis of barium hexaferrite is investigated. Relative importance of specific surface and crystal structure defects is discussed. Influence of mechanical activation on the mechanism of phase-formation is generally connected with activation of iron oxidation and formation of non-equilibrium compounds of the BaO хFе2О3, BaO Fe1-xO and BaO xFeO yFe2O3 type form, making easier crystallization conditions of ferrites with magnetoplumbit structure.
Gordienko A. I., Dymovskii A. S., Kasichev V. P., Popova I. P.
Mathematical modelling of operation of a flexible protective material for the armour vests. pp. 28--34
Summary: In the article the problems bound with creation of means of individual protection from a cold weapons are considered. The construction of a new flexible protective material is offered. With the help of a mathematical model the strain of this material is learnt during its using. It has allowed to optimize geometrical arguments of a construction.
НАДЕЖНОСТЬ И ДОЛГОВЕЧНОСТЬ МАШИН
Influence of working conditions of diesel engine on chosen parameters of the combustion process.
Summary: The results of the indication of diesel engines AD3 .152 in transient and steady conditions are presented in this paper. Transient work conditions were modelled by free running engine acceleration caused by the changes of injection pump control lever position. The following parameters were analysed: mean indicated pressure, maximum pressure, maximum pressure increase velocity, the burning start angle, maximum pressure occurance angle.
Petyushik E. E., Yakubovskii A. Ch., Yakubovskii Ch. A., Pavlovskaya L. F.
The forces and moves account at the elastic and plastic curving and lengthening of wire in a stratum of permeable material at the radial pressing of wind substance.
Summary: The stressed and strained state at the elastic and plastic curving and lengthening of wire in a stratum of wind substance at the radial pressing of permeable material is investigated. The arising of the plastic deformation and the area of the plastic loading without the wire material hardening and with it are examined. The relations for definition of the radial deformation of a wind substance stratum and of the lengthening of wire in a permeable material stratum at different loading stages are determined.
Dubrovskii A. A.
To the question of plastic deformation of cut layer. Part 1. pp. 44--47
Summary: At cutting the model with one lift's plate is real. The impossibility of realization of the model with the developed zone of chip forming is caused by the impossibility of flowing in infinite thin layer.
Gornostai A. A.
Comparison of exactitude of workpiece at molding by transversally-wedge rolling and consequent forming by closed die technique. pp. 48--51
Summary: The established variations of sizes of a volume and mass of a rolled semimanufactured material allow guaranteed to realize a master schedule of deriving of forged pieces with an elongated principal axis by scraps free of press forming.
Kashtal'yan I. A.
Forming of micro relief surfaces at the process of unfixed cutting at the turning flexible production modules. pp. 52--57
Summary: The peculiarities of surface micro relief forming in the process of cinematically unstable cutting at the turning flexible production modules are discussed. The results of some experimental research are cited.
РАДИОЭЛЕКТРОНИКА И ПРИБОРОСТРОЕНИЕ
Zatsepin N. N.
Dynamic parameters of magnetic hysteresis. II. Harmonic components of coercive force (mode of magnetic induction).
Summary: The problem of determination of any harmonic component of the ferromagnet dynamic coercive force considering the surface effect of eddy currents was analytically solved.
Belskii A. Ya., Gusinskii A. V., Dzisyak A. B., Kostrikin A. M.
The automatic measurement system of microwave fluctuations. pp. 64--71
Summary: The automatic measuring system of amplitude, frequency and insertion phase noise at microwave frequencies is presented.
Aksenchik A. V.
Modeling of irregular BWO with chains of coupled cavities. pp. 72--80
Summary: The description of mathematical model and algorithm of calculation of the characteristics of a BWO is given. In mathematical model the synthesis algorithms of electrical parameters of a coupled-cavity, equation of electrons movement are described. The results of optimization of irregular BWO on a coupled-cavity in S-band and Q-band, and also hybrid devices of a BWO-TWT are submitted. It is shown, that in a S-band the generators on irregular BWO can have electronic efficiency 50%, hybrid circuits of a BWO-TWT -- 68%. In g-band the calculated electronic efficiency of powerful BWO can reach 28%.
Protskevich A. A., Yarmosh N. A.
The crypt protection of textual data in distributed information systems by the method of protected code dictionary generation.
Summary: Protected code dictionary method is suggested. The method provides both encryption and compression.
Matskevich A. N., Sonchik D. M.
The mathematical models of absorption filters of generalized perturbations for servo system robustness. pp. 88--90
Summary: The mathematical models of filters of absorption of the standard determined and random generalized perturbations for robustness of servomechanisms operating in conditions unmonitored interval of non-stationary change of parameters of the system and the characteristics of external perturbations are surveyed.
Rylov A. S.
The discriminant-stochastic principle of the speaker verification for password cheching by the biometrical technologies. pp. 91--95
Summary: There is suggested the Discriminant-Stochastic approach to the construction of the speaker verifiers. Also the structure of one of them was examined, which permits to use better the LF-range of the modulation spectrum to improve the reliable characteristics of the speaker verification.
Byloychik V. M.
Neural synthesis method of an optimal trajectory of vehicle movement on the basis of digital map. pp. 96--100
Summary: This article describes using of neural network for problem of finding adequate way on digital map. It is suggested to adapt neural structure for one of traditional methods.
Chernous D. A., Konyok D. A., Petrokovets E. M.
The method of the stability loss problem solution for vis-coelastic rod.
Summary: A solution technique of the strong bending of viscoelastic rod problem allowing for the finite bending deflections based on the consecutive approximations is developed. This technique allows to take into account shear and stretching / compression deformations. Also it allows to cany out calculations for the different relaxation nuclei without taking into account inertial forces. Solution of the stability loss problem for cantilever beam under oscillating load is presented.
ТЕПЛОФИЗИКА, ТЕПЛОЭНЕРГЕТИКА, ТЕПЛОМАССООБМЕН
Esman R. I., Kalinichenko A. S., Krivosheev Yu. K.
Thermal-physical particularities of thin casts consolidation at the beginning.
Summary: On the base of the mathematical simulation the value of the melt undercooling has been determined during the cooling of the thin layer of the molten metal. The influence of the process thermal conditions on the degree of the undercooling has been shown. The calculations allowed determining the influence of some thermal parameters on the level of the undercooling prior the crystallization of the melt layer with different thickness.
Drozdovich V. V.
Uncertainty analysis of thyroid dose estimates, used to evaluate radiological consequences of the Chernobyl accident.
Summary: Results of uncertainty analysis of thyroid doses calculated using an environmental transfer model adapted to the local radioecological conditions of Belarus are presented. To estimate uncertainties of the model used for thyroid dose assessment the numerical simulations with Monte Carlo method were performed. Sensitivity index and rank correlation coefficient have been calculated for each model parameters. Probability density functions of resulting thyroid dose have been obtained for different age groups. As a result, uncertainty factors were estimated to be in a range 2.3--2.4 for average thyroid doses, and 2.6--3.1 for individual thyroid dose. Results obtained could be used for the improving of thyroid cancer risk estimation after the Chernobyl accident.
АННОТАЦИИ ДЕПОНИРОВАННЫХ СТАТЕЙ
Vereshchagin M. N., Shepelevich V. G., Ostrikov O. M., Tsybrankova S. N.
The influence of isotime annealing on microhardness and particularities of shear bands forming at stress concentrator of amorphous alloys Fe-Cr-Mo-V-B-Si, Fe-Cr-Mo-Ni-C-Mg-Al, Fe-Ni-Co-Cr-Mo-B-Si, Fe-P-C-Si-Al-B.
Vereshchagin M. N., Shepelevich V. G., Ostrikov O. M. Tsyrbankova S. N.
The regularities of shear bands forming at stress concentrator of amorphous alloys of Fe. p. 119
Chernobai I. A., Domanov Yu. A.
The investigation of errors of gas and liquid flow measurement with multiple-ray ultrasonic flowmeters-counters. p. 119
Михаил Степанович Высоцкий (К 75-летию со дня рождения). С. 120--122.
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Владимир Владимирович Клубович (К 70-летию со дня рождения). С. 123--124.
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Разработана и поддерживается Николаем Н. Костюковичем. Последнее обновление: 2 декабря 2006 г.
Создана при участии Игнатия И. Корсака
Копирайт © 2003-2006 Национальная академии наук Беларуси
Копирайт © 2003 Издательство "Беларуская навука"