Vestnik NSU. Series: Physics. 2013. V8, i 2

Quantum Optics, Quantum Electronics

Galchenko T. G., Vorobyov V. A. Research Photostimulated Luminescence of Solid Solutions ZnS:Cu, Pb

The dependences of the intensity of the photostimulated luminescence on the concentration of the activator – copper under irradiate by UV light with a wavelength of ? = 365 nm and laser light with ? = 940 nm are detected. On the base of the obtained dependences the optimal composition of the phosphor (Zn0,999-X Pb0,001 CuÕ) S is determined. The lead concentration was chosen arbitrarily.

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Theoretical and Mathematical Physics

 

Shchelkanova G. A., Blinnikov S. I., Saburova A. S., Dolgov A. D. Testing Different Models of Dark Matter Distribution in Galaxies

Different numerical and analytical models of dark matter (DM) give divergent predictions about the behavior of the density of DM in the centers of galaxies. In the present work a comparison of the three model distribution of DM (NFW,
Moore and Burkert) with varying degrees of singularity in the center, or without it, is carried out for four low surface brightness galaxies. Contrary to the claims in the literature, the results of fitting the observed rotation curves do not allow one to speak of the unique preference for any one of the models. For two of the four galaxies the highest levels of significance has the NFW model, and for the other two – the Burkert model. Simulation is carried out also taking into account the criteria of marginal gravitational stability of galactic disks. A comparison with the photometric data shows that the disks of galaxies under consideration, are perhaps overheated, because modeling without this criterion gives better agreement with the photometric data and better values of the chi-square test for rotation curves.

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High-Energy and Accelerator Physics, Physics of High-Temperature Plasma

 

Bobrov A. V., Bondar A. E. Background Study for a Search ? -> ?y at Super-c-? Factory

A Monte Carlo study of possible background processes in a search for ? > ?y decay has been performed for conditions of the Super-ñ–? factory (at the e+e? center-of-mass energies 3.686 GeV, 3.77 GeV, and 4.17 GeV). The background from e+e? ? ?+?? events has been analyzed. Selection criteria for background suppression have been proposed, and necessary requirements on the detector characteristics have been determined. The search was completed for energy resolution 1.5 % and 2.5 % in the calorimeter. All main tag modes of the tagging tau had taken into account (the total branching ratio all tag modes is about 90 %). The possibility of the longitudinal polarization for initial electron beam was considered for this problem. Measurement of the decay asymmetry became executable in case such polarization in spite of small events statistics. The total sensitivity for branching ratio of the decay ? > ?? at Super-ñ–? factory, in case ?/? suppression 1 per 30, is ~ 5 ? 10–10. The total number ?+?? pairs at future Super-B factory about 3 time higher, but the sensitivity for decay ? > ?? at Super–ñ–? factory in 5 time better. So the Super-ñ–? factory can successfully compete with the Super-B factory in a search for ? > ?y decay.

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Bondar A. E., Buzulutskov A. F., Dolgov A. D., Sokolov A. V., Shemyakina E. O. Study of Two-Phase Cryogenic Avalanche Detector Characteristics in Argon with Optical Readout Based on Matrix of Geiger-Mode Avalanche Photodiodes

In this article the operation of a two-phase cryogenic avalanche detector (CRAD) in Ar with optical readout using combined multiplier based on thick gas electronic multipliers (THGEMs) and a matrix of Geiger-mode avalanche photodiodes (GAPD) has been studied. The successful operation of such a detector when irradiated by x-ray photons with the average energy of 20 keV was demonstrated. The yield of such combined multiplier amounted at about 100 photoelectrons at THGEM avalanche gain of 160. In addition, the spatial resolution of the detector was measured; it turned out to be 1 mm.

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Plankin O. P., Semenov E. S. Trajectory Analysis of the Electronic-Optical System of Technological Gyrotron

The results of numerical modeling of the helical electronic beam formation system for technological gyrotron with operating frequency of 28 GHz are presented. The new code «ANGEL-2DS» designed to calculate the parameters of helical electronic beams in gyro-devices is described. Mathematical methods used in the code are briefly stated. We carried out the gyrotron trajectory analysis for the case of its usage for microwave processing of materials. The possibility of the formation of homogeneous helical electronic beams with a high degree of rotational energy is shown. The comparison of the calculated data obtained by various software with the experimental data is fulfilled. Accordance of calculation results to estimates of the electron beam parameters which are obtained by efficiency measurement is shown.

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Physics of Field, Neutral and Ionized Gases

 

Tolkachev S. N., Gorev V. N., Kozlov V. V. Investigation of Formation and Development of Stationary and Secondary Disturbances in the Favourable Pressure Gradient Area on the Swept Wing

In this work the combined technique of liquid-crystal thermography and thermoanemometry measurements is used to trace the stationary disturbance development from the moment of formation to the nonlinear stage transition. It has been shown that the pair of stationary vortices are formed after the cylindrical roughness element. These vortices modify a boundary layer and destabilize it. There is the area of maximal receptivity to the roughness location, which in the experiment was distant from the attachment line. If the stationary disturbance has enough magnitude in its core the secondary disturbances excite and lead to the laminar-turbulent transition. Secondary disturbances are sensitive to the acoustics and achieve the magnitude in hundred times higher than for the natural case.

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Yatskih A. A., Yermolaev Yu. G., Kosinov A. D., Semionov N. V. Wave Packet Excitation and Its Development in Supersonic Boundary Layer

A method of exciting of artificial disturbances localized in space and time (wave packets) in a supersonic boundary layer is developed. Experimental investigations are carried out in the low noise supersonic wind tunnel T-325 at Mach
M = 2. A model of a flat steel plate with a sharp leading edge is used. Measurements of mean flow and fluctuations are performed by using a constant temperature anemometer. To generate controlled fluctuations the short time surface glow discharge is used. Measurements of controlled disturbances are synchronized in time with glow discharge ignition. To increase the signal-to-noise ratio the time trace averaging technique is applied. Electrical power and polarity of the glow discharge initiation are changed to see their influence on the initial wave packet amplitude. Optimal glow discharge parameters for generation of artificial disturbances are found. The experimental data on the localized disturbances evolution in boundary layer are received. It is obtained that the velocity of the wave packet propagation has speed close to the free stream for the leading wave edge. The trailing edge of the wave packet spreads with subsonic speed relatively the supersonic flow. The wave packet propagates in both the streamwise and spanwise directions. Half-angle of this spreading is approximately equal to 10 degrees relative to the free stream direction. It has been found, that the wave packet is developed inside the boundary layer near of the artificial pulsations source. However the evolution of controlled disturbances leads to their radiation into free flow.

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Bilsky A. V., Gobyzov O. A., Kornilov V. I., Markovich D. M. Investigation of Influence of Air Blowing in a Turbulent Boundary Layer by Means of Digital Particle-Based Flow Visualization

It was experimentally studied the possibility of the digital particle-based flow visualization technique (PIV) of application to investigate the properties of an incompressible turbulent boundary layer modified by air blowing through a
microperforated surface. Experimental setup, including the optical measurement system is described. The advantages of the PIV method based on the proposed optical system are discussed. There are also presented the experimental data on the friction reduction and on the changes of the spatial structure and of the turbulence characteristics of the boundary layer under the influence of injection, obtained by this method. It is shown that the results gained generally match the measurements performed by alternative techniques and the basic reasons for the observed discrepancies are revealed.

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Anikin Yu. A., Anufriev I. S., Krasinsky D. V., Salomatov V. V., Shadrin E. Yu., Sharypov O. V. Physical and Numerical Modelling of Internal Aerodynamics of the Vortex Furnace with Distributed Tangential Input of Burner Streams

The work is devoted to experimental and numerical modelling of internal aerodynamics of a new type furnace for the thermal power plant steam generator with technology of pulverized-coal combustion in vortex flow. Measurements of
aerodynamic features of the flow in the laboratory air isothermal model of the furnace have been performed with twocomponent laser Doppler velocimeter. Numerical simulation of three-dimensional turbulent isothermal flow in the
laboratory model has been carried out with the use of CFD package FLUENT. Detailed 3-D flow structure in the studied model has been obtained. The agreement between numerical predictions and measurements on mean flow velocity distributions has been shown.

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Solid-State and Semiconductor Physics, Physics of Nanostructures

 

Zaikovsky A. V., Fedoseev A. V., Sakhapov S. Z., Evtushenko A. B., Serebriakova M. A., Kostogrud I. A., Kalyuzhny N. A., Andreev M. N., Baranov E. A., Sokolov R. E., Smovzh D. V., Novopashin S. A. Arc Discharge Synthesis of Oxides and Carbides of Tungsten and Aluminum

Experimental investigations of the possibility of arc discharge method for synthesis of nanoparticles of oxides and carbides of tungsten and aluminum have been presented. The method is based on anode atomization of composed
graphite – aluminum and graphite – WO3 electrodes. The transmitted electron microscopy, thermal gravimetric analysis and X-ray diffraction were applied for the characterization of morphology and properties of synthesized materials. It was experimentally shown the arc discharge method allows to syntheses the nanoparticles of oxides and carbides of tungsten and aluminum.

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Gets K. V., Subbotin O. S. Theoretical Study of Collective Vibration Amplitude Properties of Amorphous Ices

Model structures of low (LDA), high (HDA) and very high (VHDA) density amorphous ices were obtained using the Molecular Dynamics method (MD). Radial distribution function and function of vibrational density of states calculated
through the lattice dynamics method are in good agreement with experimental data. The existence of collective vibrations taking part in amorphous ices was confirmed. It was shown that the amplitudes of localized vibrations are more than ten times higher than amplitudes of delocalized vibrations. Molecular distribution on the amplitude of translational and libration vibrations and molecular distribution on the values of potential energy represented the similarity of the amorphous ices properties to crystal ones.

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Chemical, Biological and Medical Physics

 

Druzhbin D. A., Drebushchak T. N., Boldyreva E. V. Electron Density of Paracetamol Metastable Polymorph, Topologycal H-Bonds Analysis

The experimental electron density of paracetamol metastable polymorph (orthorhombic, Pbca) was derived from highresolution X-ray diffraction at 100 K. The multipole model was used to refine electron density and for experimental analysis of the features of the critical points for orthorhombic modification. Geometrical H-bonds features were obtained from spherical and multipole models. The current study provides topological H-bonds analysis in orthorhombic paracetamol compared with stable monoclinic paracetamol polymorphs in normal conditions.

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Munzarova A. F., Kozlov A. S., Zelentsov E. L. Effect of Terahertz Laser Irradiation on Erythrocyte Aggregation in Healthy Blood

The study is devoted to a topical field of research – the interaction of terahertz radiation with biological structures. This paper examines the impact of the Novosibirsk terahertz free electron laser on the aggregation and morphology of red blood cells of prepared blood samples in vitro. The aim of this study was to determine the safe action of the laser radiation on red blood cells and the identification of specific effects that arise in the erythrocytes under the action of terahertz radiation and lead to non-destructive disaggregation of individual cells of erythrocytes. The methodology of sample preparation of the objects, obtaining and analyzing micrographs based on the classification of red blood cells and particles model colloidal system of the area into classes corresponding to the individual and aggregate particles, was developed. Found that 5sec exposure of 200 mkl sample of red blood cells by the terahertz radiation with wavelength of 130–146 mm and an average power density of 8–10 W/cm2 does not lead to visible changes in cell morphology and the number of aggregated particles. The exposure of more than 25 seconds can lead to lysis of erythrocytes. When exposed for 10–15 sec the average number of erythrocytes in the aggregates is reduced by 10–15 % in some cases – up to 80 %.

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Brief Reports

Shmakov A. G., Chernov À. À., Knyazkov D. A., Korobeinichev O. P., Kozlov V. V., Litvinenko Yu. A., Katasonov M. M., Grek G. R. Effectiveness Investigation of Multijet Burner with Different Inlet Gas at Diffusion Combustion

The purpose of the given work consists in an experimental study of the efficiency of a multi-jet burner with various of the gas admission at diffusion combustion. For description of the methane flame parameters at the diffusion combustion the hot - wire measurements were carried out. The main studies were carried out in ICKC of the SB RAS and the hot-wire measurements were carried out in ITAM of the SB RAS.

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