Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2008, No.1

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Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2008, No.1

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

Number 1, 2008

MATERIALS ENGINEERING, METALLURGY

Gordienko A. I., Krylou-Alefirenka V. V.
Natural deformation aging of strongly deformed carbon steels. pp. 5--10

Summary: The spontaneous changing of the properties of low-carbon and high-carbon steel during its natural steel deformation aging has been investigated. The ranges of such changes are determined for ultimate strength as well as for yield strength.

Samoilovich Yu. A., Timoshpolskiy V. I., Fomenko A. P., Kabishov S. M.
Thermostress condition of billets at continuous casting. Part 1. Calculations of thermal stresses inside high-quality billets of alloyed steel grades. pp. 11--18

Summary: The behaviour regularities of indices of stress-strain state of billet are discovered based on mathematical model for heat and thermostress state of continuously casted high-quality billets during casting. The recommendations to choose required intensity of secondary cooling, which is defined by the size of water cooling area and value of heat transfer coefficient (a_w) in the area, are developed.

Mironovich L. L., Gartman E. V., Lin D. G., Timoshenko A. P.
Kinetics of total crystallization of coatings deposited from disperse polyethylene terephtalate. pp. 19--21

Summary: The total crystallization of quenched polyethylene terephtalate coatings with heterogeneous structure was studied by the methods of optical microscopy. A time variation of different components of this structure under isothermal crystallization was revealed. The radial growth of spherulites being in amorphous matrix was determined.

MECHANICAL ENGINEERING AND MECHANICS

Klubovich V. V., Machiho D. V., Sakevich B. N.
Research of areas of the attraction of vibro-impact movement modes. pp. 22--25

Summary: The attraction regions of possible steady-state regimes are constructed by point mapping method. Topology of these regions with changes of the parameters is investigated.

Myaldun A. Z., Yanusov V. A.
Simulation of local heterogeneities formation in a process of particles capture by moving interface. pp. 26--30

Summary: The local heterogeneities formation in process of graded composite materials production by vertical directional solidification of melt containing disperse particles is investigated by means of numeric simulation.

Stelikov N. E.
Kinetic model of after-effect in solid bodies. pp. 31--34

Summary: The theory of deformation and destruction of solid bodies for the description of the phenomena of recover is advanced. Dependence of change of strain of recovery on time after unloading the stretched body is obtained.

Martynenko M. D., Bosiakov S. M.
Absorption of transversal and longitudinal waves in half-momentary viscous liquid and elastic mediums. pp. 35--38

Summary: One of the variants of definition of factors of absorption of transversal and longitudinal waves in half-momentary elastic medium, based on analogy between half-momentary elastic and viscous liquid mediums is considered.

Chernysh N. K.
On the theory of ideal centrifugal atomizer. pp. 39--47

Summary: The theory of ideal centrifugal atomizer is described. This theory is distinguished from G. N. Abramovich’s theory with more accurate dependencies for coefficient of living section and consumption.

Zhuravkov M. A., Sherbakov S. S.
Study of conjugate stress state in the conditions of contact loading and volume deformation. pp. 48--57

Summary: Conjugate stress state of a roller -- ring active system in the conditions of contact loading and volume deformation is considered. The distribution of the contact stresses was obtained by numerical integration of the solutions for unit normal and tangential tractions applied to a half-space over the area of the elliptic distribution of contact pressure. Stress state under bending of the ring was obtained using bending theory. Conjugate stress state in the roller -- ring active system was obtained by superposing the fields of stresses conditioned both by action of normal and tangential elliptically distributed contact tractions and by bending of the ring. The change of the stress state in comparison with the solution for the pure contact problem is analyzed.

POWER ENGINEERING, HEAT AND MASS TRANSFER

Yanitsky V. A.
New methods of managing of interaction of man-operator with technical means of equipment control in power engineering. pp. 58--62

Summary: Possible approaches to design of informational system of operators support of energy power complex based on automatic analysis of technological situations are considered. The automatic control system subsystem for automatic detection and analysis of steam-turbine installation operating irregularity is designed and introduced into production. The developed software structure is described as well as structure and content of subsystem messages. The subsystem of automatic analysis of equipment operating irregularity is developed by RUP "BELTEI".

RADIOELECTRONICS AND INSTRUMENT MAKING

Djejora A. A.
Calculation of the mathematical model of screened plated measuring condenser. pp. 63--67

Summary: Calculating of capacitor filled with anisotropic flacky medium is described. Integral equation for electrodes of condenser is stated as algorithm of their numerical solution. The adequateness of the model to real constructions is tested.

Hurlo Yu. E., Voroshen A. V., Gusinskiy A. V., Kostrikin A. M.
Absorbent power measurement unit PM 0.01--20 GHz. pp. 68--72

Summary: Millimeter wave measurement laboratory of BSUIR has been developed microwave instrumentations, equipment and devices. It is necessary to measure absorbed power at measurement of output power of SHF signals, measurement of radiation level at calibration of antennas. The power meter РM 0.01--20 GHz is developed on the base of the prototype M3-51. The developed power measuring device includes 24 bits sigma-delta analog to digital converter (ADC) with built-in improved reference voltage source, interface unit, power supply, input-output device, microprocessor controlling unit, low noise direct current amplifier, LCD, keyboard. The power meter can statistically process the measuring power. It is possible to input the frequency of a measured signal to calculate automatically the conversion coefficient for each transducer by calibration tables. That has expanded the range of measured signal frequencies up to 20 GHz. The automatic zero compensation is enabled. The device has RS232, USB, IEEE-488.1 connectors.

Kurayev A. A., Sinitsyn A. K., Yaromenok S. I.
Optimal structures of waveguide E_0m mode converters for relativistic Cherenkov’s amplifiers and oscillators. pp. 73--78

Summary: Optimal structures of E_0m--E_0(m+1) mode converters on the intervals of periodically and arbitrary irregular circular waveguides with the use of block-matrix sweep and minimization Nelder--Mead methods are defined.

Hurlo Yu. E., Dzisiak A. B., Beloshitskiy A. V., Gusinskiy A. V.
The device for measurement of amplitude-time parameters of microwave impulses AM 54641 A. pp. 79--83

Summary: Millimeter wave measurement laboratory of BSUIR has been developed microwave instrumentations, equipment and devices. The measuring device for amplitude-time parameters of microwave impulses, developed in the laboratory, is examined. It is designed for measurement of instant and peak power values with measurement time less than 1 ms, measurement of time parameters of periodical microwave impulses in the range of frequencies of 0.01--25.86 GHz. Microwave detector of own design and digital oscillograph Agilent 54641A are used in the measurement device. An attenuator is connected to the input of microwave detector in order to expand its dynamic range up to 1W measurement power. Presence of PC as a part of the device allows to automate the measurement process, to obtain, register, process measurements data and to transfer measurement data if working as a part of automated measurement system.

Kuzmenok A. G.
Device for testing magnetic properties of open-form magnetic conductive articles. pp. 84--88

Summary: This study provides parameters of induction magnitude occurring in bars and cores made of 80HXC & 79 HM magnetic alloys, being magnetized with field H = H₀sinwt, within the following limits: magnitude strength H₀ within 25 -- 200 A/m, frequency w from 100 kHz to 1000 kHz. The blok diagram of the testing device applied is given.

INFORMATION TECHNOLOGIES AND SYSTEMS

Anischanka U. V., Kulbak L. I., Martsinovich T. S.
Reliability models of cluster computing systems. pp. 89--99

Summary: The generalized structured scheme of cluster computer system and its decomposition to elements of structured reliability scheme are presented. The reliability indices of cluster computing system were justified. The formulas to calculate the reliability indices were obtained. Relations between reliability indices of elements of structured reliability scheme and reliability indices of cluster computer system were presented. Example of reliability calculation of special model of cluster computing systems was adduced.

Nesenchuk A. A., Fedorovich S. M.
Investigation of root locus portraits of dynamic system families. pp. 100--110

Summary: Investigation of the root locus portraits for control systems with parameters varying within some preset limits (interval systems) has been carried out. The main typical configurations of portraits have been discovered, their correlation with the variable system parameters have been established, that allows to synthesize the system root locus portrait in correspondence with the designer requirements.

DIAGNOSTICS AND SAFETY OF TECHNICAL AND ENVIRONMENT SYSTEMS

Mironov V. P., Pribylev S. V., Matusevich J. L., Bulyga S. F.
Irradiated uranium in Belarus soils: pollution levels, chemical transformation and radionuclide fractioning during migration. pp. 111--116

Summary: The results of study of vertical migration of Chernobyl originated uranium in contaminated soils and chemical transformation of fuel particles under action of natural factors using ²³⁶U as a tracer and methods of mass-spectrometry at the isotopic analysis are presented. It is shown that 15 years after the accident at ChNPP more than 60% of irradiated uranium is localized in non-oxidized fuel particles.

SCIENTISTS OF BELARUS

Mikhail Stepanovich Vysotski (On his 80^th birthday). pp. 117--119
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Evgeny Markellovich Makushok (On his 80^th birthday). pp. 120--121
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To the memory of Corresponding Member of NAS of Belarus Nil Nickolaevich Dorozhkin. pp. 122--123
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