Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2008, No.3
/ Publications / Scientific Journals
Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2008, No.3
|
Proceedings of the National Academy of Sciences of Belarus
(Vestsi Natsiyanalnai Akademii Navuk Belarusi)
SERIES OF PHYSICAL-ENGINEERING SCIENCESPublished by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Number 3, 2008
CONTENTS
MATERIALS ENGINEERING, METALLURGY
Shut V. N., Syrtsov S. R.
Positive temperature coefficient of resistivity in thin films of barium titanate obtained by RF-sputtering. pp. 5--7
Summary: Polycrystalline 100(Ba0.75Ca0/08Sr0.17)Ti3+(0.35/2)Y2O3+1.0SiO2 thin films were prepared by RF- sputtering and subsequent heat treatment. The temperature dependence of resistance of the films was investigated. The films had semiconductive properties. The increase of the resistance were observed in the temperatures range 50--80 °C -- PTCR effect. The warp of the resistance in area of phase transition was 70%. The small resistance warp is explained by small concentration of surface states and presence of stresses in fine-grained films.
Samoilovich Yu. A., Timoshpolskiy V. I., Kabishov S. M.
Dendritic straight arch strength assessment in continuous casting steel billet. pp. 8--11
Summary: There was carried out a theoretical assessment of deformations and stresses, occurring in dendritic straight arch of continuous casting billet, exposured by liquid steel ferrostatic pressure. Findings of investigation might be used in prediction of high-quality billet indexes, determined by porosity and axled segregation origin.
Dubinski N. A.
Investigation of wear resistance of composite coatings obtained by the method of electrochemical deposition. pp. 12--17
Summary: It is established that wear resistance of iron coating with inclusions of aluminum oxide, kaolin, silicate calcium particles rises 5 to 10 times as compared with coating without disperse particles and rises 1.5 to 2.5 times as compared with tempered steel 45. The friction coefficient reduces from 0.097 to 0.026. The conditions of application of composite coatings on the base of iron have been optimized. It is shown that changes of mechanical properties of iron obtained by the method of electrochemical deposition depend on parameters of its fine structure change.
Krylou-Alefirenka V. V.
Effect of heating conditions on low-carbon steel properties during continuous softening annealing. pp. 18--23
Summary: The successive effect of temperature-time heating parameters on properties of cold-deformed low-carbon steel has been investigated during continuous rapid softening thermal treatment. The stimulation and suppressing of processes that proceed at low-temperature annealing stages are shown to affect the development of all subsequent transformations which is manifested by change in mechanical properties obtained on completing thermal treatment. The regularity is obtained of steel yield strength dependence on temperature and intermediate isothermal holding, heating rate in high-temperature region and heating temperature.
Fomikhina I. V., Lisovskaja Yu. O., Alekseev Yu. G., Korolev A. Yu., Niss V. S.
Influence of electrolytic-plasma treatment on the structure and properties of superficial layer of 12X18H10T steel. pp. 24--29
Summary: The influence of electrolytic-plasma treatment modes on structure, phase compositions, parameters of thin structure, microhardness of superficial layer of stainless steel 12X18H10T is investigated by the method of X-ray diffraction analysis, TEM research and microhardness.
Dudetskaya L. R., Orlov Yu. G.
Electric-slag casting of stamp molds. pp. 30--36
Summary: The analysis of technical information on electric-slag casting of stamp molds is carried out.
MECHANICAL ENGINEERING AND MECHANICS
Pochtenny E. K., Minukovich S. M., Shmelev A. V.
Fatigue durability estimation of a dump-truck frame based on in-service stress measurements. pp. 37--42
Summary: Basic fatigue durability evaluation stages of a dump-truck frame based on in-service stress measurements are considered. On the basis of finite element analysis, exploitation and test data the weakest zone of the frame by fatigue has been revealed. Its fatigue properties have been determined by results of local model tests. Local model of weakest zone consider material and stress concentrators of the real structure. The method used for an estimation of fatigue durability of a frame is described. The computer program "Resurs" has been developed for automation of all calculation stages. The obtained results agree well with the exploitation data.
Mironov D. N.
Estimation of aviation engine durability by a method of multiple linear regression. pp. 43--47
Summary: The equation defining resource of the aviation engine is obtained. One of the modern methods -- method of multiple linear regression is used to process the collection of parameters of Russian and foreign engines. Using this equation, one can estimate the resource of the aviation engine with an error about 5%. The empiric equation allows to make new engines cheaper.
Guskov A. V.
Choose of operational and structural masses of designed wheel tractor 4K4. pp. 48--55
Summary: The computational procedure of operation and design weights of projecting wheel tractor 4K4 is described. There is their computation for tractor of drawbar category 6.0.
Kozeruk A. S., Klimovich V. F., Sukhotsky A. A., Filonova M. I.
Investigation of double-side forming process of high-precision convex-concave lenses. pp. 56--63
Summary: A kinematic circuit of the device for simultaneous bilateral processing precision negative meniscus type lenses is resulted. The mathematical model of bilateral forming regularities is developed and the technique is created, allowing to calculate the most favourable operating modes of the machine tool in view of distribution of an allowance on a processable surface. Experimental-theoretic investigations are executed and concrete process parameter values of the bilateral processing, providing amplified material removal in this or that zone of a part are revealed.
Stelikov N. E.
Kinetic simulation of torsion creep. pp. 64--67
Summary: A kinetic theory of torsion creep on the basis of simulation of tangent tensions distribution along a section in time dimension ras been developed.
POWER ENGINEERING, HEAT AND MASS TRANSFER
Levdansky V. V., Dragun V. L., Chizhik S. A., Smolik J.
Influence of size effects on coalescence of nanoparticles. pp. 68--71
Summary: A theoretical study of the influence of the size effects on coalescence of nanoparticles is presented. Joint effect of the size dependence of the surface tension and the activation energy for diffusion of atoms in the particles on the characteristic coalescence time is analyzed. Equation for the dimensionless characteristic coalescence time with account for the above-mentioned effects is obtained.
Kashin Yu. A., Safonov I. V., Kashina R. E.
Parameter optimization problem of designed autonomous wind-energy turbine. pp. 72--81
Summary: The variational form of an parameter optimization problem for construction elements of AWET under definite expected wind conditions is given. The ratio of mathematical expectation of power output of AWET to the mass of its support column with the appropriate strength is optimized. For the modeling variant of the problem an algorithm of the solution is given. The results of numerical experiment, which illustrate influence of different factors on the energy-effectiveness of the optimal one and two rotor AWET are also given. It is proven that for every variant of construction of optimal AWET there exists an optimal power output.
INFORMATION TECHNOLOGIES AND SYSTEMS
Konckak V. S., Kolesnikovich A. N., Khitrikov S. V.
Optimization of FFT algorithm structure to minimize its program and technical costs. pp. 82--89
Summary: On the basis of analysis of different modifications of "fast" algorithm of the Fourier transformation a conclusion, is made that most friendly, simple and suitable for formalising is the algorithm by Cooley and Tukey. Its superiority over other algorithms is exhibited. The formula of the baseline operation is obtained and the possibility of its realization is demonstrated.
RADIOELECTRONICS AND INSTRUMENT MAKING
Dudar N. L., Syakerskiy V. A., Emelyanov V. A.
Simulation and investigation of experimental samples of high-voltage PMOS-transistor. pp. 90--94
Summary: The calculation of technological parameters of high-voltage PMOS transistor regions and these regions forming regimes was carried out by means of using the programme SSuprem4. The input data for simulation is the threshold voltage 0.8--1.8 V, drain-source breaking-down voltage over 80 V and on state drain current over 0.5 mA at gate voltage equal 5 V. The drain current Id dependence on gate voltage Vg calculation was carried out taking into account epitaxial film specific resistance rv and gate oxide thickness d spreads (rv = (1.5 ± 0.225) W • cm; d = (75 ± 5) nm). The comparative analysis of simulation results with experimental data have illustrated, that n-type epitaxial film specific resistance rv = 1.5 fi-cm and gate oxide thickness d = 75 nm allow to take permissible level of investigated PMOS-transistor threshold voltage.
Chernyshev A. V.
Heat treatment testing of steel details by the higher harmonic components method. pp. 95--102
Summary: Formation of minor hysteresis loops of steel ferromagnetic samples in the weak magnetic fields is considered. Measurings are done in the broken magnetic chain. The dependence of the third harmonic amplitude of the transducer emf on the residual magnetic induction of the minor loop and sample hardness after heat treatment has been determined.
Kuzmenok A. G.
Investigation of magnetic properties of open-form magnetic conductive articles. pp. 103--107
Summary: The devise to examine open-form magnetic core elements magnetism (e.g. for magnetic head elements) has been developed and made. The device has the following working parameters: 1. Magnettic field production capacity: H = H0 sin wt, adjustable within the following limits; magnitude strength H0 - 25 -200 A/m, frequency w - 100 - 1000 kHz. 2. The sample is controlled within the field having under 5% discontinuity. 3. When the piece is inserted in the converter, the magnetic conditions (strength H and frequency w) do not change. The blok diagram of the device is given in this work.
DIAGNOSTICS AND SAFETY OF TECHNICAL AND ENVIRONMENT SYSTEMS
Mozgalyov V. V., Liplyanin P. K., Kren A. P.
Estimation of rubbers ageing degree by the dynamic indentation method. pp. 108--112
Summary: A possibility of application of the dynamic indentation method for the estimation of rubbers ageing degree and prediction of the residual resource capacity for work of mechanical rubbers is examining.
Matyuk V. F., Burak V. A.
Testing of tempering quality of upgradable medium-carbon steels. pp. 113--118
Summary: It is shown that at aperiodic form of magnetizing and demagnetizing pulses the increase of their duration up to 2.5--10 ms assures a gain in sensitivity of the gradient of normal component of the residual magnetization field strength to the tempering temperature of the specimens of the up-grading medium-carbon steels hardened in advance. The choice of the amplitude of the demagnetizing pulse such that the articles tempered at maximum temperature are fully demagnetized, ensures the testing of the heat treatment quality at medium-temperature and high-temperature tempering.
SCIENTISTS OF BELARUS
Leonid Grigorievich Krasnevsky (On his 70th birthday). pp. 119--120
Click here to read this article in Russian (Win1251)
Alexander Aleksandrovich Mikhalevich (On his 70th birthday). pp. 121--122
Click here to read this article in Russian (Win1251)
In memory of Academician of the NAS of Belarus Peter Petrovich Prokhorenko. pp. 123--124
Click here to read this article in Russian (Win1251)
/ Publications / Scientific Journals / Back to Top of Page
Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: November 3, 2008
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 2008 The National Academy of Sciences of Belarus
Copyright © 2008 The Belaruskaya Navuka Publishing House
