Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2010, No.3
/ Publications / Scientific Journals
Proc. of the Natl. Academy of Sciences of Belarus, Ser. Phys.-Eng. Sci., 2010, No.3
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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, 2010
CONTENTS
MATERIALS ENGINEERING, METALLURGY
Rudenko S. P., Shipko A. A., Mosunov E. I., Valko A. L.
Calculation of hardenability of carburizing layers of construction steels. pp. 5--10.
Summary: Method of calculation of hardenability of constructional steels carburizing layers is suggested. The equations for calculation the dividing factors defining size of hardness on the set distance from butt- end face of a sample are resulted. Results of calculation will be well coordinated with the data of experimental definition of the hardenability of carburizing layers of butt- end samples.
Pish I. V., Klimosh U. A., Popov R. U.
Influence of some additives on processes of sintering and properties of a ceramic brick. pp. 11--13.
Summary: Results of researches on influence of additive components on processes of formations of phases and properties of the ceramic brick obtained on the basis of fusible clays of deposits of Belarus are resulted. Influence of a mode of roasting on formation of crystal phases anortite, quartz and cristobalite on the properties of samples is established. Introduction of additives allows to lower temperature of roasting of a ceramic material.
Chichko A. N., Sachek O. A., Likhouzov S. G., Sobolev W. F., Wedeneev A. W.
Algorithm and software for processing of images of pearlitic steels microstructures. pp. 14--21.
Summary: The technique of the computer analysis for calculation of distance between pearlite colonies in the pearlitic steel eutectoid colonies is offered, allowing to automate processing of microstructures. Formulas for a quantitative estimation of the microstructures, using integrated dependences for various intervals of change of distance between pearlite colonies are offered.
Antanovich N. A., Ischenko M. V.
Structure and properties of low-charged tribotechnical composites on the basis of polytetrafluoroethylene. pp. 22--28.
Summary: The influence of habitus on a mechanism of modifying action of nanodimension particles of thermoplastic polymeric matrixes is considered. Deformative--strengthening and tribotechnical characteristics of low-charged composites on the basis of polytetrafluoroethylene are investigated. The concentration range of formation of a nanogeterogeneous supramolecular structure of a composite with optimum working characteristics is stated.
MECHANICAL ENGINEERING AND MECHANICS
Sherbakov S. S.
Stress-strain state of a disk--cylinder active system in conditions of contact interaction and bending of the cylinder. pp. 29--34.
Summary: Fields of stresses and strains in a disk--cylinder active system is observed. Stress state was obtained by superposing the field of stresses conditioned by action of normal and tangential elliptically distributed contact forces and by non-contact bending of the cylinder. A significant change of the stress-strain state in comparison with the solution for the pure contact problem is shown.
Turomsha V. I., Safiullin V. T.
A methodology for assignment of optimal parameters of cutting mode. pp. 35--43.
Summary: The analysis of methods to assign optimal parameters of cutting rates when machining workpieces in metal cutting machine-tools is made. It has been found that to get maximal cutting capabilities it is necessary to provide simultaneously the full capacity of the machine tool and the full application of the cutting tool by durability. This can be achieved by solving a mathematical model including the equations of the main motion drive power of a machine tool and the durability (acceptable cutting speed) of a cutting tool. The method suggested differs from the well-known method of M. Kronenberg in the fact that the feed and the depth of cut are independent variables and the application of a cutting tool means the provision of a given period of durability.
Zhuravkov M. A., Krupodyorov A. V.
A point force solution for isotropic elastic space with a spherical cavity. pp. 44--50.
Summary: A point dynamic force solution for isotropic elastic space with spherical cavity was constructed, when the force direction is parallel to direction of radius-vector of point of attack. Some examples of calculations with different kinds of boundary conditions are represented.
Meleshco I. N., Pronkevich S. A., Chigarev A. V.
Thin plates bending under absence of transverse loading. pp. 51--57.
Summary: A method of numerical evaluation of plate flexure is developed. A deformation of a single radius circular plate under asymmetrical boundary conditions is examined and the results are compared to numerical computations obtained with help of ANSYS.
Boyko L. I., Prybylski V. I., Goman A. M., Rakova N. L., Pershukevich N. P.
Calculation of potato digger vibration for small contour fields. pp. 58--66.
Summary: A design method of vibration of screen type potato diggers for small contour fields is proposed. Elastic system of the potato digger is described as a three--mass dynamic system having eight degrees of freedom in vertical, horizontal and angular generalized coordinates. Inertial interactions with their initial phases applied to digging module of the potato digger are assumed as force excitation of mass oscillation in dynamic system. As a result calculated levels of vibration in normalized parts are determined for the potato diggers of two alternative designs, having wishbone or elastic suspension of screen.
Rapinchuk A. L., Vorobey A. S., Brench A. A., Belohvostov G. I.
Experimental research of process of dry clearing of potato. pp. 67--72.
Summary: A stand for research of a machine for dry clearing of potato is developed and made. Obtained experimental dependencies of specific power consumption of the process, its productivity, efficiency of potato clearing and damageability of tubers on parameters of the machine regimes and construction clearly demonstrate the expediency of use of the developed construction of a machine for dry clearing of potato.
POWER ENGINEERING, HEAT AND MASS TRANSFER
Borodulya V. A., Palchonok G. I., Rabinovich O. S., Vasilevich S. V.
Fluidized bed production of carbon nanomaterials from biomass. pp. 73--76.
Summary: A nnovel two-stage method of fluidized bed production of carbon nanomaterials from biomass has been developed. An experimental setup and results of experimental evaluation of the method with woody biomass are presented. Principal possibility of mass production of inexpensive carbon nanotubes from domestic renewable raw materials is shown.
Bublievsky A. F., Gorbunov A. V., Bublievsky D. A., Niconchuk A. N., Dolgolenko G. V.
Investigation of electric arc in twin plasma torch with forced convective heat transfer in arc column. pp. 77--83.
Summary: The experimental investigation of electric arc was carried out for d.c. twin plasma torch with tube single chamber electrode assemblies at operation with air. Operating modes are varied as follows: arc current I = 105 -- 550 A, arc voltage U = 400 -- 1320 V, plasma gas (air) flow rate summarized on electrodes G = (0.76 -- 7.18)10-3 kg/s, interelectrode (between anode and cathode assemblies) degree a = 45 – 620, distance between axises of the electrode assemblies at outlet from their nozzles c = 0.07 -- 0.14 m, pressure at plasma torch outlet p ~ 0.1 MPa. Analytical model of electric arc was developed for twin torch which is operated with forced convection mode of arc column. Comparison with experimental data is fulfilled. New theoretical expression to describe arc current--voltage characteristics in generalized form which corrected for experimental results was obtained.
Assad M. S.
Estimation of hydrogen additions influence on ecological indicators of an internal combustion engine applying methods of mathematical planning. pp. 84--89.
Summary: A planning technique and a results processing algorithm of the multifactorial experiment when investigating working procedure of internal combustion engine, are unfolded. Efficiency of the system analysis concerning the investigated factors influence on toxicity of the engine combustion products when applying the experiment planning theory, is proved. The models, which approximate combustion products composition (CO, CO2, O2, CHx and NO) depending on the bent shaft speed, the oxidant excess coefficient and the degree of hydrogen addition to mixtures, are obtained. The relations, which enable to achieve the ratio of variable parameters which provides a zero emission level of harmful products, are deduced.
INFORMATION TECHNOLOGIES AND SYSTEMS
Lipnitsky S. F., Stepura L. V.
Algorithms of hypertext creation based on situational--syntagmatic network. pp. 90--95.
Summary: Algorithms of hypertext creation are offered, i.e. the partition of text documents on monothematic fragments and establishments of situational relations between them. The process of constructing a hypertext consists of four main phases: identification of informative words and sentences in the source text, the construction of super--phrasal unities for each informative sentence, the partition of the text on monothematic fragments consisting of one or more super-phrasal unities, creating the hyperlinks between monothematic fragments. Besides traditional lexical, morphological and syntactic features used in the formation of monothematic fragments of hypertext the algorithms are based on the use of special knowledge base as a situational--syntagmatic network.
RADIOELECTRONICS AND INSTRUMENT MAKING
Tomilo Zh. M., Shastak A. S., Shkatulo G. G.
Vibrating magnetometer. pp. 96--98.
Summary: A vibrating magnetometer which measures the magnetic moment of sample in temperature range 4,2--300 K is presented.
Mikhnev V. A., Badeev V. A.
Confocal microwave imaging of heterogeneous cylindrical objects. pp. 99--103.
Summary: A modified method of confocal visualization is presented. Features of circular imaging for the case of partial survey of object have been studied. First and second interfaces reflection removal techniques have been applied before focusing to improve image quality and heterogeneities detection.
Jezhora A. A., Rubanik V. V.
Model of a spatially periodical dielectric sensor. pp. 104--109.
Summary: A calculation of capacity of a spatially periodic dielectric sensor is resulted. The integrated equations for condenser electrodes are resulted. The algorithm of their numerical solution is given. Adequacy of model to real designs is checked up.
DIAGNOSTICS AND SAFETY OF TECHNICAL AND ENVIRONMENT SYSTEMS
Andruhovich S. K., Martsynkevich B. A., Khimanovich A. M., Korneev S. V., Stepanov A. S.
Use of radionuclides with short half-life for real-time reconstruction of neutron spectrum of nuclear installations. pp. 110--118.
Summary: The possibility of using of radionuclide's with short half-life (from 5 seconds to 5 minutes), produced in nuclear reactions with various thresholds is investigated for reconstruction of neutron spectrum of nuclear installations. Using of such type reactions allows application of neutron activation method in on-line mode. Required parameters such as efficiency of registration and energy resolution of g--spectrometer, speed of solution pumping, minimum neutron flux are determined.
SCIENTISTS OF BELARUS
Pyotr Ivanovich Yascheritsyn (On his 95th birthday). pp. 119--120.
Click here to read this article in Russian (Win1251)
Oleg Vladislavovich Roman (On his 85th birthday). pp. 121--122.
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Stanislav Alexandrovich Astapchik (On his 75th birthday). pp. 123--124.
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