Doklady of the National Academy of Sciences of Belarus, 2000, Vol.44, No.2
/ Publications / Scientific Journals
Doklady of the National Academy of Sciences of Belarus, 2000, Vol.44, No.2

DOKLADY OF THE NATIONAL ACADEMY OF SCIENCES OF BELARUS
(Doklady Natsionalnoi Akademii Nauk Belarusi)Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus 
CONTENTS
MATHEMATICS
Korzyuk V.I., Lemeshevsky S.V., Matus P.P.
Conjugation problem of jointseparate flow of viscoelastic and viscous fluids in plane duct. pp. 58
Summary: The problem of conjugation concering joint separate flow of viscoelastic and viscous fluids in a plane duct is considered. By method of energy inequalities and averaging operators with variable step existence of a unique strong solution of this problem is proved in the general multidimensional case. For numerical solution of onedimensional conjugation problem difference scheme is constructed. The consistency conditions on the interface are approximated with the second order of accuracy with respect to spatial variable. Error estimate for the difference scheme is obtained.
Gabasov R.F., Kirillova F.M., Ruzhitskaya E.A.
Stabilization of inverted pendulum. pp. 912
Summary: A stabilization method for nonlinear model of inverted pendulum under large perturbation of initial state is described. Results are illustrated by numerical calculations.
Makarov E.K., Rachkovsky N.N., Son Wen
Arcwise connectedness of closed maximal point set for convex compactum. pp. 1315
Summary: We prove that the efficient point set of a compact convex set in a Hausdorff topological vector space is arcwise connected provided it is closed.
Starovoitov A.P.
The problem of describing sequencies of best trigonometric rational approximations. pp. 1618
Summary: For any nonincreasing sequence {a_{n}}_{n}^{¥}, a_{n} ® 0, a_{n} ³ 0 of real numbers the continuous 2pperiodic function f, with
the properties R_{n}^{T} (f) = a_{n}, n = 0, 1, 2,..., has been constructed, where R_{n}^{T} (f) are the best uniform rational approximations of the 2pperiodic function f by trigonometric rational functions of degree not exceeding n.
Kruger A.Ya.
Strict (e, d)semidifferentials and extremality of sets and functions. pp. 1922
Summary: New definitions of extremality for sets and functions are offered. Necessary and sufficient extremality conditions are stated in Asplund spaces in terms of strict dsemidifferentials and strict dnormals.
Yablonsky O.L.
Classification of approximation methods for stochastic integrals in algebra of generalized stochastic processes. pp. 2325
Summary: Approximation methods for stochastic integrals in the algebra of generalized stochastic processes and their classification are considered.
Kukrak G.O.
Hyperspace and perfect maps. pp. 2627
Summary: This paper deals with properties of maps induced by closed maps of topological spaces on their hyperspaces. Some applications of the results to the theory of absolutes are discussed.
Kovalevskaya E.I.
pAdic version of Khintchine's theorem for planar curves in convergence case. pp. 2830
Summary: We prove a padic analogue of the convergence part of Khintehine's theorem for planar curves with nonzero curvature.
Lepin V.V.
Space complexity of accessibility problem for frontwidthconstrained graphs. pp. 3133
Summary: We show that the graph accessibility problem for graphs of frontwidth h(n) can be solved in space O(h(n)(log n).
INFORMATICS
Listopad N.I.
Synthesis of optimal networks. pp. 3437
Summary: Six models of optimum network synthesis for telecommunication are considered. The approach is based on the methods of discrete optimization. Some demands are formulated for emergency situations when the telecommunication network is breakdown. The results are confirmed by the UNIBEL network operating.
PHYSICS
Knyazev M.A.
Formation of coupled states in scalar theory F^{4}. pp. 3841
Summary: Conditions favouring of coupled states of solitonlike objects in scalar F^{4} theory are analyzed.
Gusak N.A.
The charge grating relaxation in the photorefractive crystals. pp. 4244
Summary: The equation for describing of the charge grating relaxation in the refractive crystals is obtained and the solution of this equation is found. It is shown that the beginning of the process of the relaxation is described by the Gauss's function transforming to the ordinary exponential at the final stage,
Makarenko L.F., Lapchuk N.M., Latushko Ya.I.
Detection of bistable thermal donors in silicon by EPR technique. pp. 4548
Summary: It has been shown that bistability of thermal double donors (TDD) in silicon can be observed by EPRtechnique. The spectrum of the bistable TDD species (TDD2) has been isolated using heattreatment of Czochralskygrown ntype silicon crystals with initial resistivity 4.5 W•cm, at temperatures 400 °C and subsequent irradiation with electrons (E = 3.5 MeV). The principal values of the TDD2 gtensor are determined: g_{1} = 1.9928, g_{2} = 2.0009, g_{3} = 1.9999. Variation of the TDD gtensor is presumed to be due to the defect growth along the g_{1} [100] direction.
Khalyavin D.D., Lobanovsky L.S., Yarunichev V.P., Troyanchuk I.O.
Magnetic resistance effect in monocrystals La_{0.74}Ba_{0.26}(Mn_{1x}Co_{x})O_{3} (0.12 £ x £ 0.22). pp. 4952
Summary: Single crystals of La_{0.74}Ba_{0.26}(Mn_{1x}Co_{x})O_{3} (0.12 £ x £ 0.22) perovskites have been obtained. All the crystals exhibit a jump of resistivity and peak of magnetoresistance around T_{c}. The low temperature phase transforms from metallic to semiconducting state with increasing cobalt content, while magnetoresistance tends to rise in spite of metalsemiconductor transition. Anomalous behavior of magnetization was found to be determined by structural modifications.
Vaskov D.G., Makovetsky G.I., Yanushkevich K.I.
Solid solutions of Co_{x}Ni_{1x}Te (0 £ x £ 1) and their structural characteristics. pp. 5355
Summary: Solidsolutions Co_{x}Ni_{1x}Te were synthesized. The continuous solidsolution series with NiAstype structure was shown to be formed in the Co_{x}Ni_{1x}Te system using Xray diffraction analysis and density measurements.
CHEMISTRY
Avlasevich Yu.S., Knyukshto V.N., Solovyov K.N.
Copolymer of Nisopropylacrylamide and 5(4acryloyloxyphenyl)10,15,20triphenylporphyrin. pp. 5659
Summary: Watersoluble copolymer of Nisopropylacrylamide and 5(4acryloyloxyphenyl)10,15,20triphenylporphyrin and its Zncontaining analog have been synthesized. Absorbance curves of polymer aqueous solutions as a function of temperature have been studied. Absorption spectra of water and methanol solutions of polymers are presented.
Martsinkevich A.A., Prokopchuk N.R., Krutko E.T., Shiroky V.L., Paplevko I.G.
New polyimide modifier. pp. 6061
Summary: The possibility of considerable improvement of stressstrain and thermal properties of polyimide films by regulating crosslinked structure of polyimide with modistier hexafluorophosphatecobaltitsinium is shown.
Ivashkevich O.A., Gaponik P.N., Matulis Vadim E., Matulis Vitaly E.
Quantum chemical investigation of electron and spatial stucture of 2(1methylvinyl)tetrazoles. pp. 6265
Summary: Quantum chemical and spectroscopic studies of the electron structure and rotational isomerisation of novel tetrazolecontaining monomers including 2(1methylvinyl)tetrazole, 2(1methylvinyl)5methyltetrazole, 2(1methylvinyl)5phenyltetrazole have been carried out. Quantum chemical calculations at the 631G**//AMI and 631G**//STO3G levels and spectroscopic data indicate that electrondensity distribution in isopropenyl group does not substantially depend on the nature of substituent in the tetrazole ring. Energies of internal rotation and equilibrium content of Scis and Stransconformers have been calculated. The data of calculations along with coupling constant values in ^{13}C NMR spectra indicate that laekof spatial interaction between isopropenyl group and substituent in the position "5" of the tetrazole ring is lack. The obtained data allow to suppose that the considered 2(1methylvinyl)tetrazoles should be characterized by similar reactivity in the radical polymerization processes.
BIOLOGY
Ipatyev V.A., Bulko N.I.
Antagonism and dilution effects reducing radionuclide uptake by Pinus sylvestris. pp. 6668
Summary: The paper reports results of an experiment specially designed to decrease ^{137}Cs and ^{90}Sr accumulation levels in Pinus silvestris through enriching radionuclidecontaminated soil with nutrients. It is determined that the effect of "antagonism" plays a crucial role in blocking root supply of ^{137}Cs into trees, while the dilution effect is of prime importance for preventing root uptake of ^{90}Sr. The paper demonstrates it is incorrect to transfer mechanically results of the studies on growing clean agricultural products to forests.
Kraskovski G.V., Migolenya T.I., Pashatskaya T.V., Lipskaya M.V.
Specific reaction of complex of free tumour antigens of the tumour carriers serum with serum antibodies of spleen lymphoid cells recipients of micehomologic tumour carriers. pp. 6972
Summary: It is established that serum intact recipient of micetumourcarriers spleen lymphoid cells maintains set of isoantibodies, which specific reacts to complex of free serum tumoural antigens of the same tumour carriers. Antibodies, which are produced by lymphoid cells (removed from tumourcarrier organism) on abolition of oncotolerance, can be used for tumour type diagnostics and determination.
Yakushev B.I., Budkevich T.A., Zabolotny A.I., Mironov V.P., Kudryashov V.P., Yaroshevich O.I., Zhuk I.V.
Americium241 in vegetation of natural biocenoses and agrocenoses at Belarus territories contaminated with Chernobyl fallout. pp. 7376
Summary: As a result of bdecay of ^{241}Pu, the content of ^{241}Am increases progressively in soils, contaminated with Chernobyl TUE. Sofar ^{241}Am displayed higher (0.51.5fold) biological mobility than isotopes of ^{239,240}Pu. Activity of ^{241}Am in surface phytomass of wild and cultural plants varies from 0.04 to 5.9 Bq • kg^{1} of dry weight. ^{241}Am contribution to the total TUE contamination of plants made up 6080% in 19961998. Ficed trials in the areas adjacent to the 30km zone showed that mobility of ^{241}Am and plutonium was 515 times as high as in the zone.
Sidorovich E.A., Sergeychik S.A., Sergeychik A.A.
Effect of sulphur dioxide on physiologicalbiochemical characteristics of assimilation in Pinus sylvestris. pp. 7779
Summary: Sulphur buildup in pine needles of Pinus sylvestris from 0.11 to 0.17% negatively affects basic physiological processes, photosynthetic reactions, pigment and protein levels, N:S:P ratios. These changes are factors destabilizing forest ecosystems in Belarus.
Soltanov V.V., Borisov O.L.
Effect of ischemiareperfusion of small intestine on efferent activity of skin neurons N.Saphenus. pp. 8082
Summary: Experiments in rats showed that small intestine ischemia and reperfusion led to enhancement of sympathetic efferent activity in n. saphenus skin branches. In conditions of small intestine denervation, sympathetic efferent discharge remained unchanged during ischaemia, but it increased with reperfusion. The latter fact suggests occurrence of humoral influences from the jejunum on the activity of skin supplying sympathetic neurons.
Bazhanov D.P., Bazhanova A.A., Urbanovich O.Yu.
Mutants of nitrogenfixing bacterium Pseudomonas sp.418 defective in root colonization: isolation and phenotype characterization. pp. 8386
Summary: Mutants of nitrogenfixing rhizosphere bacterium Pseudomonas sp.418, losing the ability to colonize competitively barley roots, were isolated by random Tn5 mutagenesis. A Southern blot analysis indicated single insertions of Tn5 in eight mutants. In two mutants Tn5 inserted twice into different DNA regions. The mutants were characterized and defects of adaptive characters were observed: reduced attachment to root surface, impaired chemotaxis, defects in motility, caused by nonproduction of flagella or nonseparation of cells after division, alterations in exopolysaccharide production. As a rule, effect of Tn5 insertions was pleiotropic.
Yeliashevich N.V.
Weatherinduced variability of ^{137}Cs content in overground part of automorphic soil plants. pp. 8790
Summary: Daily variability of specific ^{137}Cs content in plants (12 species) in summer time under the influence of climatic factors is shown. The rise of residual solar radiation (exceeding 2 MJ/m^{2}, day) and average diurnal temperature over 1015 °C (for different species) induced decrease; precipitatioris  induce increase in activity of overground phytomass. A threshold and thresholdless type of ^{137}Cs build up was recorded at higher daily fallout. Critical sum of diurnal precipatation for the latter case in 5 species (Agropyron repens (L.) P. B., Bromus inermis Leyss., Origanum vulgare L., Festuca arundinacea Shreb., Acer platanoides L.) is in the range of 2025 mm.
Sokolik A.I.
Lateral segregation of ion transport mechanisms on plasmalemma and regulation of ionic flow between plant cell and environment. pp. 9194
Summary: The model of interaction and regulation of plasmalemma iontransport mechanisms, based on assumption of spatial heterogeneity of the electric field on membrane, was proposed. Heterogeneity is the result of basic ion transport mechanisms  ionic channels of different types, HATPase pump, fixed surface charge assumed to be located separately on plasmalemma because of discrete nature of the forming molecular structures and homogeneously distributed plasmalemma nonselective ionic leakage. The coefficients of steady state distribution of Na^{+}, Cs^{+} and S^{2+} in cell and environment as a function of plasmalemma potential difference were calculated. Theoretical and experimental values agree well in reasonable range.
EARTH SCIENCES
Anoshko Ya.I., Bordon V.E., Matveyev A.V., Olkhovik E.T.
Possibility of heavy mineral prospecting in Anthropogene deposits of Belarus. pp. 9598
Summary: Results of mineralogical studies of Anthropogene deposits presented in the paper suggest that heavy mineral concentrations may be high enough, which undeniably is of prospecting interest. Background contents for the sum of heavy minerals have been determined and where their anomalous concentration areas have been outlined. The Molodechno and Gorodok areas may be primarily regarded as promising for heavy minerals, and the arrangement of specialized prospection seems expedient.
Garetsky R.G., Konishchev V.S., Kovchuto A.M.
Distribution of salt uplifts in PripyatDnieperDonetz avlacogen. pp. 99102
Summary: It is shown that most salt uplifts of the PripyatDnieperDonetz avlacogen adjacent to faults are of the first generation. Only some are superimposed and therefore may be classified as salt uplifts of the second generation.
Naidenkov I.V., Arkhipova A.A.
New data on stratigraphic scheme of crystalline basement in Belarus. pp. 103106
Summary: The new version of stratigraphic scheme of Early Precambrian rocks, of crystalline basement structure in Belarus and 20 year geochronometric data is presented. The suggested version is distinguished from the scheme approved in 1982, mainly, by presence of subdivisions including stratified series of amphibolite facies, and by more detailed differentiation of magmatic and ultrametamorphic complexes.
Volchek N.L., Zhuchkevich V.V., Krasinskaya N.G., Krasovsky A.N., Lyudchik A.M., Turyshev L.N.
Atmospheric ozone climatic norm for Belarus and ozone behaviour in 19981999. pp. 107110
Summary: Total atmospheric ozone climatic norm for Belarus has been revised using data obtained in 19941997 with the PION spectrometerozonometer. Anomalous behavior of total ozone in 19981999 is discussed.
Taran L.N., Varaksa V.V.
Black schist complex in southeastern part of Belarusian crystalline massif. pp. 111113
Summary: Horizons of graphitebearing gneisses and schists distinguished in the southeastern part of the Belarusian crystalline massif are included into Okolovo metavolcanicsedimentary series. Prospecting of graphitebearing gneisses and schists for platinumgroup elements and gold is defined by 1) sedimentary origin of graphitic rocks, 2) their space compatibility with deep fault and granite intrusions which promoted forming of the graphite and sulphiderich metasomatites, 3) abundance of sulphides and specific association of elements (Cu, Zn, Pb, Mo, As, Ag).
TECHNICAL SCIENCES
Andrizhievsky A.A., Loukashevich A.G., Mikhalevich A.A., Trifonov A.G.
Simulation of interaction between vapourdroplet wastes and aerosol discharges of power units. pp. 114117
Summary: Sources of possible technogenic contamination of atmosphere near power units have been considered. The technique of estimating potential interaction of wet cooler plumes with power unit discharges and other atmospheric pollututants is presented. The method based on software complex RELEASE comprises models describing dynamics of closetosurface migration of technogenic impurities in aerosphere. Results of simulation experiments as applied to analysis of cooler emission effect on aerosol wastes of nuclear power unit ventilation system have been provided.
Yashcheritzin P.I., Akulovich L.M., Rakomsin A.P., Kozhuro L.M., Mrochek Zh.A.
Thermodynamic impact control in the course of electromagnetic surfacing. pp. 118121
Summary: It is shown that adaptive controlof electromagnetic surfacing ensures stability of technological system.
/ Publications / Scientific Journals / Back to Top of Page
Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: May 14, 2000
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 2000 The National Academy of Sciences of Belarus
Copyright © 2000 The Belaruskaya Navuka Publishing House