Doklady of the National Academy of Sciences of Belarus, 1999, Vol.43, No.1
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Doklady of the National Academy of Sciences of Belarus, 1999, Vol.43, No.1

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
Goglev V.V., Yanchevskii V.I.
Unramified Bauer groups of function fields of local elliptic curves with multiplicative split reduction. pp. 58
Summary: It is proved that any element of pprimary torsion of unramified Brauer groups of function fields of local elliptic curves with multiplicative split reduction can be presented by the tensor product of at most three cyclic unramified division algebras. Moreover, the tensor cyclic factors are found in an explicit form.
Potapchik M.A.
A particular class of linear functionals on Holder spaces. pp. 912
Summary: Linear functionals on the Holder spaces given by Stieltjes integrals with respect to functions with infinine variation are considered. New estimations of their norms are obtained.
Lomovtsev F.E.
Differentiation and integration with respect to the parameter of infinite variable operators with variable domains of definition. pp. 1315
Summary: Main concepts of differential and integral calculus are introduced with respect of the parameter of infinite variable operators with variable domains of definition. A formula of integration by parts is valid.
Zverovich Ye.I.
A special case of the homogeneous problem of conjugation and the generalised problem of inversion. pp. 1619
Summary: The number l of linear independent solution of the homogenous problem of linear conjugation on the closed Riemann surface of genius h ³ 1 the socalled special case has been determined.
Alekhno A.G.
On the nonlinear boundaryvalue problem for analytical functions for a ray. pp. 2023
Summary: The general solution is constructed for nonlinear boundaryvalue problem in the space of bounded analytical functions.
Minchenko L.I., Bondarenko S.V.
To analysis of sensibility of problems of parametric optimisation. pp. 2427
Summary: Perturbed nonlinear programming problems with a set of solutions of the type "weak sharp minimisers" are studied. Holder and Lipschitz behaviour of solutions are proved.
Zverovich I.Ye.
Perfect (k, P)dominantly independent graphs. pp. 2831
Summary: Let a(G), g(G), i(G) and g_{p}(G) be the independence number, the domination number, the independent domination number and the Pdomination number of graph G, respectively. For any k ³ 0 we define the following hereditary classes ai(k) = {G : a(H)  i(H) £ k for every H Î ISub(G)},
ag(k) = {G : a(H)  g(H) £ k for every H Î ISub(G)}, and ag_{p}(k) = {G : a(H)  g_{p}(H) £ k for every H Î ISub(G)},
where ISub(G) is a set of all induced subgraphs of a graph G. In this paper we present a finite forbidden induced subgraph characterisation for ag_{p}(k) for any k ³ 0 and any hereditary property P which is closed under adding isolated vertices to the graph G Î P. It implies such characterisations for ag(k) and ai(k) for any k ³ 0.
Matus P.P., Panayotova J.N.
Strong stability of twolayer operatordifference schemes. pp. 3236
Summary: The twolayer operatordifference schemes in the finitedimensional Hilbert space are investigated. The estimates of strong stability with perturbed operators (coefficient stability), perturbations of the right side and the initial data are obtained. The correspondent results are proved under natural assumptions for perturbation of the operators. The investigation of the coefficient stability is illustrated for the scheme with weights, approximating the initialboundary problem for the parabolic equation.
PHYSICS
Andreev A.D., Borzdov V.M., Valiev A.A., Zhevnyak O.G., Komarov F.F.
The effect of the doping level of a MOSFET substrate on the size of the doping region. pp. 3740
Summary: Models for calculation of ionization region in silicon MOSFET channel are considered. The effect of the doping level of the substrate on the size of this region in MOSFET is studied.
Aleinikov D.V., Tolkachev E.A., Tomilchik L.M.
Discrete symmetries and conjugation of monopole Hamiltonians. pp. 4144.
Summary: Constraints for parameters of the selfconjugated extensions of the relativistic Hamiltonian describing the interaction of an electrically charged "isospinor" particle with monopole are obtained from requirements of symmetry relative to discrete transformations.
Lavinskaya E.I., Nogotov E.F., Fomin N.A.
The effect of anisotropy of turbulence of a laseractive medium on divergence of radiation. pp. 4548
Summary: We have considered the case of a plane wave incident on to a slab of flowing gas that is slightly anisotropically turbulent. The effect of turbulence is manifested by fluctuations in the index of refraction, which causes probing light refraction. R. m. s. of the 2D fluctuations of light deflection angles is analysed and expressed in terms of r. m. s. of the 3D fluctuations of the refraction index. The possibilities of using a new diagnostic technique  specklephotography  in the studies of 3D turbulent flows are analyzed. It is shown that statistical characteristics of 3D turbulent flow correlate with statistical characteristics of the 2D field of refractive indexes of light that passed through the flow. The sensitivity range of the specklephotography proved to be quite enough for recording temperature fluctuations.
CHEMISTRY
Lishtvan I.I., Zhukov V.К., Kartel N.Т., Strigutskii L.V.
On the interrelation of the "oxygen effect" in EPR spectra of carbonised materials with their porous structure. pp. 4952
Summary: By cause of magnetic dipoledipole interaction of O_{2} molecules with carbon PMC as centres with different relaxation times, registration of EPR spectra of carbon materials of the same carbonisation only in air atmosphere does not provide necessary information in analysis of their structure. As manifestation of the "oxygen effect" depends on characteristics of the porous structure, EPR spectroscopy can be used for expressassessment of carbonised materials as intermediate products in producing active carbons.
Levchik G.F., Levehik S.V., Lesnikovich A.I.
The effect of phospham on combustion and thermal decomposition of polyamide 6. pp. 5356
Summary: It is shown that phospham is an efficient fire retardant additive to polyamide 6 because it promotes charring of the polymer. In spite of high thermal stability, phospham reacts with the polyamide producing phosphonitriles and phosphoamines which decompose at higher temperature and give char. The free radical mechanism is suggested to contribute to the charring.
Shchukin G.L., Belanovich A.L., Savenko V.P., Sviridov V.V.
Electrochemical synthesis of barium titanide. pp. 5758
Summary: Peculiarities of formation of ВаТiO_{3} on the titanium surface in an aqueous solution of barium compound by anode spark oxidation have been investigated.
BIOLOGY
Vasilenko V.Yu., Petruchuk T.A., Gourine V.N.
The effect of GABA_{B}agonist baclofen on neutral thermal sensitivity in hypothalamic slices of rats. pp. 5962
Summary: Both thermosensitive and temperatureinsensitive neurons were inhibited by GABA and GABA_{B}agonist baclofen in our hypothalamic slice experiments. Besides, baclofen increased the thermal sensitivity in thermosensitive and temperatureinsensitive cells. However, some thermosensitive neurons set to the threshold temperature close to the normal brain temperature were not influenced by exciting (previous studies) or by GABAergic inhibitory (the present study) inputs. This indicates that such hypothalamic neurons are true central thermodetectors possessing an inherent mechanism of thermal sensitivity.
Melnov S.B., Minenko V.F., Demidchik E.P.
Analysis of the frequency of mutant Thelpers as a parameter for biodosimetry. pp. 6366
Summary: The present article is devoted to development of a model of restoration of the dose based on the frequency of mutant Thelpers. The object of the study is lymphocytes of peripheral blood of children exposed to radioiodine therapy on medical indications. On the basis of mathematical processing it is shown that the frequency of mutant cells is directly related with additional radiation doses. The character of the relation is found and the mathematical basis of restoration of the biological dose is developed.
Soltanov V.V., Sergeev V.A.
Dynamics of the blood flow in the stomach with intestinal ischemia/reperfusion. pp. 6769
Summary: The results suggest that both during small intestine ischemia and reperfusion there is a hyperemic response in the gastric mucosa caused by the nervous reflex mechanism and the humoral mechanism in efferent influences on the stomach.
Shalygo N.V., Yaronskaya E.B., Averina N.G.
The effect of Fe^{2+}, Co^{2+} and Zn^{2+} cations on the development of the photodynamic effect induced by endogenous porphyrins in green plants. pp. 7073
Summary: It was shown that Fe^{2+}, Co^{2+} and Zn^{2+} cations decreased the levels of protoporphyrin IX (PP) and Mgprotoporphyrin IX (monomethyl ester) (MP(E)) accumulated in intact green leaves of Artemisia vulgaris in the presence of 5aminolevulinic acid (ALA) and 2,2'dipyridyl (DP) in darkness. The extent of photodamage op the plant under subsequent illumination correlated with the residual content of PP and MP(E). The efficiency of cation action depended on the duration of the dark period after ALA and DP treatment, on the time of cation treatment and chemical nature of used cations. Treatment of the plant with Fe^{2+} resulted in a maximum effect which could be compared with the influence of Co^{2+}. Zn^{2+} cations had the weakest effect.
Vlasova A.B., Palilova A.N., Spiridovich E.V.
Identification of X and Lvirus resistance of potato clones, using protein markers. pp. 7476
Summary: A study of the general fraction of soluble proteins of Altair cv. potato clones which differ in their X and Lvirus resistances was carried out. Analysis of electrophoretic spectra shows that almost each of the studied clones is characterised by at least one specific polypeptide (or by the absence of one of them). Polypeptides with a difference in their qualitative content can be potential protein markers of virus resistance genes.
Sokolik A.I.
Nonselective ion conductivity of plasmalemma as an important component of the system of membrane transport of ions in plants. pp. 7780
Summary: As a result of the present work, nonselective ion leakage of plasmalemma of plant cells was identified and its main properties were found. It is shown that there is no selectivity in the series of monovalent cations and that there is no pH effect and potential dependence of its conductivity. The contribution of nonselective leakage to the total permeability of the plasmalemma (of the order of magnitude of 0.1 for potassium ions under normal conditions) is determined and it is shown that it increases substantially for cations discriminated by potassium channels.
Gorbunova N.B., Kalyunov V.N.
The effect of neuroleptic agents on the blood concentration of the nerve growth factor in mice under psychosocial stress. pp. 8183
Summary: Using bicentric immunoradiometric assay, it is found that single intraperitoneal injection of neuroleptics aminazine, haloperidol and droperidol (5 mg/kg) which inhibit excitation processes mostly in aminergic structures of the limbicoreticular complex significantly reduced an increase in the nerve growth factor (bNGF) in blood of mice, induced by psychosocial stress.
Vismont F.I., Zinchuk V.V.
Involvement of nitric monoxide in maintenence of prooxidantantioxidant balance and temperature of the bodies of rats exposed to superheating. pp. 8487
Summary: Experiments in rats indicated that lipid peroxidation, the state of tissue antioxidant defense and the establishment of body thermoregulatory reactions were dependent on the activity of Larginin  NO pathway. NO appears to be one of the factors that maintains prooxidantantioxidant balance of the body exposed to external heating.
EARTH SCIENCES
Garetskii R.G.
A model of the structure of the lithosphere over the CentralBelarusian transect. pp. 8891
Summary: The model of the structure of the litosphere within the Belarusian part of the CentralBelarusian transect is considered. The modem crustal and lithospheric thicknesses are mainly associated with tectonic elements of the platform.
Starchik T.A.
The role of faults in formation of subsoil oil deposits in the Pripyat trough. pp. 9294
Summary: The effect of the fault amplitude, kinematics and orientation on the processes of the subsalt Devonian oil deposit accumulation in the Pripyat trough was estimated.
Konishchev V.S.
Tectonic regime of the Pripyat trough and the rate of sedimentation. pp. 9598
Summary: The rates of sedimentation and subsidence of the basement of the Pripyat trough were investigated and it was proved that the border of the rift and superimposed seneclise stages was at the border of Devonian and Carboniferous times.
Chizhikov Yu.A.
Zoning of the Belarus territory according to the probability of extreme manifestations of wind erosion. pp. 99101
Summary: The index of probability of extreme wind erosion (D_{e}) was calculated. Five groups of areas were distinguished in Belarus: with low (D_{e} up to 1), moderate (1  5), increased (5  10), high (10  20) and very high (D_{e} more than 20) probability of occurrence of dust storms.
Karataev G.I., Dankevich I.V., Golobokov S.V.
Crustthrough deep faults in Belarus: a scheme of location and geophysical justification. pp. 102105
Summary: Maps of deep faults of Earth's crust of Belarus are created and discussed.
Bulkin Yu.S., Levykh N.N., Ilkevich G.I., Varaksa V.V.
New data in favour of potential rare metal content of granitoids in the Zhukhovichy massif (Belarus). pp. 106109
Summary: Results of the present studies suggest that molybdenum ore concentrations can possibly be revealed in granitoids of the Zhukhovichy type.
TECHNICAL SCIENCES
Kharitonchik S.V., Abdulkhaerov R.A., Evgrafov A.N., Romanenko G.A.
Internal aerodynamic resistance of vehicles. pp. 110112
Summary: Internal aerodynamic losses in the space under the bonnet and in the cabin of a vehicle are considered and data on the aerodynamic resistance of the space under the bonnet are presented for a number of cars and lorries.
Korshunov F.P., Bogatyrev Yu.V., Zhdanovich N.E., Marchenko I.G.
The influence of radiationinduced thermal defects on characteristics of power silicon pnstructures. pp. 113116
Summary: Data of a study of the influence of the effective recombination centres formed in diffusion pnstructures on Si exposed to electron irradiation followed by annealing in the temperature range 400600 °C on their characteristics in the operation temperature range 77400 К are given in this article.
Chichko A.N., Yatskevich Yu.V.
A new method of choosing the size of feeders in the foundry system based on threedimensional computer simulation. pp. 117120
Summary: A mathematical model which uses the scheme of the terminal differences for computer simulation of the thermal processes of cooling alloys in the foundry systems is described. A new method of choosing the feed size in the foundry systems, which is based on the threedimensional computer simulation of cellular automat, is proposed. This method is considered for solidification of "ball" and "cube" casts.
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