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SIBERIAN JOURNAL OF PHYSICS. Scientific Journal. 2018. V13, i
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Radiophysics and Electronics |
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Budnikov K. I., Kurochkin A. V. Method of Experimental Research of HTTP Filters
Filtering of user requests to Internet resources allows regulating access to the information requested.
The paper presents a technique for bench testing of characteristics of the HTTP protocol filtering device, which includes the scheme and procedure of testing, the method of obtaining and
evaluating the properties of the device under study. A two-channel symmetric computer model of
the HTTP request filter is considered. It operates at the packet level, using the method of restricting
access to the Internet resource by its URL. The results of experimental tests of the model according
to the proposed technique are presented. |
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High-Energy and Accelerator Physics, Physics of High-Temperature Plasma |
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Arzhannikov A. V., Kalinin P. V., Sandalov E. S., Sinitsky S. L. Selective Properties of a Planar
Electrodynamic System for Two-Stage Generation of Terahertz Radiation
The paper presents the results of computer 3D-modeling and «cold» measurements of the selective
properties, obtained for the main units of the planar electrodynamic system that is intended for
the two-stage generation of terahertz radiation. During the investigations, the calculated and measured
values characterizing these properties, were compared in order to search for the optimal geometry
of the electrodynamic system units. The performed optimization should ensure the achievement
of a high level of power and coherence both at the first stage, when mm-radiation is generated, and
at the second stage, when it is converted to the terahertz band through scattering by an electron
beam. |
13 |
Physics of a Fluid, Neutral and Ionized Gases |
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Lysenko V. I., Gaponov S. A., Zubkov N. N., Smorodsky B. V., Ermolaev Yu. G., Kosinov A. D. Influence of Dispersed Tangential Heavy-Gas Blowing into the Supersonic Boundary-
Layer on Its Stability
Joint theoretical and experimental investigation of the influence of the distributed tangential
blowing (into a boundary layer) heavy gas (sulfur hexafluoride of SF6) on hydrodynamic stability to
natural disturbances of the supersonic flat-plate boundary layer at free-stream Mach number M = 2
have been performed. For the first time experimentally it is shown that in case of such blowing
there is a boundary-layer stabilization, generally due to reduction of growth of disturbances at higher
frequencies. At the same time the frequency corresponding to the maximum spatial disturbance
amplification rates decreases.
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Kornilov V. I. Steady Blowing / Suction into Turbulent Boundary Layer of a Symmetrical
Aerofoil Section
The efficiency of steady air blowing / suction into the turbulent boundary layer of the NACA
0012 aerofoil section in an incompressible flow was studied experimentally. The blowing / suction
was carried out through finely perforated sections located on the adjacent sides of the wing and being
parts of its streamlined surface. The studies were performed at the Reynolds number
Rec = 0.7x10^6 in the range of angles of attack a = –6 – 6?. The obtained results clearly indicate the
ambiguous nature of the combined control action in the form of blowing / suction on the aerofoil
aerodynamic characteristics. The maximum gain in lift-to-drag ratio of about 1.8 units is achieved at
zero angle of attack a. An increase in a leads to a decrease in the effectiveness of this method of
action on the boundary layer.
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Ivashchenko V. A., Mullyadzhanov R. I. Numerical Simulation of Stratified Submerged Jet
ÈIn this paper, stratified jet flows are investigated using the numerical simulation method. For
a high accuracy of spatial discretization of the Navier-Stokes equations the method of spectral
elements was chosen. By the method of direct numerical simulation (DNS) the solution algorithm
was validated using the example of a turbulent flow in a periodic pipe with Reynolds number
Re = 5 300, constructed using the average velocity and the diameter of the pipe. Comparison of statistical
characteristics showed good agreement with the literature data. A further investigation was
concentrated on a circular turbulent air jet flowing into a space filled with air, helium or carbon dioxide. For the air-to-air pair, the results are shown to be in good agreement with the literature data
and other LES calculations. During the analysis of the helium-air and carbon dioxide-air pairs, their
basic similarities and differences were revealed both with each other and with the air-air pair, it was
suggested that the effects associated with stratification predominate over viscous effects.
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45 |
Shmakov A. G., Vikhorev V. V., Grek G. R., Kozlov V. V., Kozlov G. V., Litvinenko Yu. A.
Combustion of the Round Microjet Premixed Hydrogen with Oxygen Efflux from the Linear
Channel
The purpose of this work consists in experimental study of combustion features of the round
microjet premixed hydrogen with oxygen. Situation of the microjet efflux and combustion of hydrogen/
oxygen mixture from a straight micronozzle with a parabolic mean velocity profile at the
nozzle exit is considered. It is shown that addition of oxygen leads to decrease in velocity range
of existence of a microjet combustion in comparison with similar parameter at diffusion combustion
of a pure hydrogen. It is found that with growth of a microjet velocity efflux, the combustion termination
of its is connected with reduction of an oxygen part in mixture. It is revealed that the spherical
shape of «bottleneck flame region» is transformed to the narrow and extended area of a laminar
flame of a cylindrical shape. Its thinning process grows with growth of microjet velocity efflux. |
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Vikhorev V. V., Grek G. R., Kozlov V. V., Litvinenko Yu. A., Litvinenko M. V., Shmakov A. G.
Combustion of the Round Microjet of Hydrogen with Oxygen Mixture Efflux from the
Curved Micronozzle
The purpose of this work consists in experimental study of combustion features of the round
microjet premixed hydrogen with oxygen. Situation of the microjet efflux and combustion of hydrogen/
oxygen mixture from a curved micronozzle with a top-hat mean velocity profile at the nozzle
exit is considered.
It is shown that addition of oxygen leads to decrease in velocity range of existence of a microjet
combustion in comparison with similar parameter at diffusion combustion of a pure hydrogen. It is
found that with growth of a microjet velocity efflux, the combustion termination of its is connected
with reduction of an oxygen part in mixture. Existence of spherical «bottleneck flame region» is
revealed. Its region deformed under influence of the Dean and Kelvin – Helmholtz vortices. «Bottleneck flame region» size is reduced with growth of a microjet velocity efflux. It is shown that the
area of a turbulent flame is also is subjected to distortion from influence of the Dean and Kelvin –
Helmholtz vortices. It is found that the range of the round microjet combustion both pure hydrogen,
and its mixture with oxygen efflux from a curved micronozzle is much wider than the range of the
round microjet combustion both pure hydrogen, and its mixture with oxygen efflux from a linear
micronozzle. |
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Korobeishchikov N. G., Roenko M. A., Nikolaev I. V. Diagnostics of Gas Cluster Flows by
Transverse Intensity Profile of Molecular Beam
An experimental method for diagnostics of clusters in molecular beams formed from supersonic
gas jets is described. The method is based on measuring the cross-section profile of the mass intensity
of the beam at a given distance behind the skimmer and it allows one to determine the main parameters:
the mean cluster size, the ratio of clusters to monomers and the cluster flow density. The
described method can be used to diagnose cluster beams of any pure gases, without creating special
models or determining empirical constants. Since the cluster beam has a high intensity, highly sensitive
and complex equipment is not required for measurements. With this method, the average sizes
of Ar clusters in the range from 50 to 2,000 molecules per cluster were determined. The reliability
of the obtained values of the mean cluster sizes is confirmed by a comparison of the results with the
data of other authors obtained by the various experimental methods using the similarity parameter
of flows with condensation (the Hagena parameter) Ã*. The physical limitations of the described
method were analyzed. |
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Prokhorov E. S. Computation of Equilibrium States of Reacting Carbon-Oxygen Thermodynamic
System
The problem of determining the equilibrium states of reacting thermodynamic system that is the
molecules of substances consisting of only oxygen and carbon atoms has been numerically solved
basing on given external parameters (pressure and temperature). Here it has been assumed that the
shift of system chemical equilibrium resulting from the chemical reaction can imply the presence of
condensed carbon as suspended ultradispersed graphite particles among the gaseous products
of reaction. In computations, the values of pressure, temperature and the relation of concentration of
oxygen and carbon atoms have been varied. The conditions, under which carbon condensate appears
in the reaction products and homogeneous thermodynamic system becomes heterogeneous one,
have been determined. |
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Solid-State and Semiconductor Physics, Physics of Nanostructures |
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Kovalyov A. A. Generation Lines Selector for Molecular IR Lasers
Applicability of several approaches to generation lines selection in molecular IR laser is investigated:
diffraction grating placed in spite of one of cavity mirrors, Bragg mirror, inclined and reflective
interferometers. A selector is proposed which combines advantages of Michelson interferometer
with phase reflective interferometer, and which permits reliable selection of a chosen vibrationrotation
generation line. The selector calculation is performed for the case of waveguide CO2 laser.
Two variants of schemes for laser tunability over generation lines are analyzed by using this selector. |
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