Tomsk Polytechnical Institute

Tomsk, Russia

Tomsk Polytechnical Institute

Tomsk, Russia
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Grigor'ev V.P.,Tomsk Polytechnical Institute | Koval' T.V.,Tomsk Polytechnical Institute | Ozur G.E.,Institute of High Current Electronics
Technical Physics | Year: 2010

The mechanisms behind limitation of current of nonrelativistic high-current electron beams in the plasma-filled diode immersed in the external guiding magnetic field whose intensity is comparable with that of the beam self magnetic field are studied. It is shown that the beam current is limited by transmission capacity of the double layer between the cathode and anode plasma on the one hand and, on the other hand, by charge neutralization of the beam and by the decrease of the longitudinal velocity of the beam electrons under the action of the induced electric field and of the beam self magnetic field. The effect of the beam self fields on its cross-sectional current density and energy distributions is studied. Results of the numerical simulations are in good agreement with the experimental data. © Pleiades Publishing, Ltd., 2010.


Nikitenkov N.N.,Tomsk Polytechnical Institute | Khashkhash A.M.,Tomsk Polytechnical Institute | Shulepov I.A.,Tomsk Polytechnical Institute | Khoruzhii V.D.,Tomsk Polytechnical Institute | And 3 more authors.
Russian Journal of Non-Ferrous Metals | Year: 2011

A high-vacuum installation for the qualitative and quantitative investigation of the content of monatomic and molecular gases (hydrogen, oxygen, nitrogen, water vapors, gaseous hydrocarbons, CO2, CO, etc.) on the surface and in the near-surface layers of compact and porous materials is designed. Methods of radiation-stimulated and thermally stimulated desorption, as well as a technological method for degassing solid materials via electron irradiation, are achieved in the installation. The results of an investigation into the hydrogen content upon saturation and its emission from polycrystalline (average grain size d > 1μm) and submicrocrystalline (d < 0.1 μm) titanium under radiation and thermal effects are presented as an example of the use of the abovementioned methods. © 2011 Allerton Press, Inc.


Vysokomornaya O.V.,Tomsk Polytechnical Institute | Kuznetsov G.V.,Tomsk Polytechnical Institute | Strizhak P.A.,Tomsk Polytechnical Institute
Russian Journal of Physical Chemistry B | Year: 2011

The processes of heat and mass transfer with phase transitions and chemical reactions in the ignition of liquid fuel by a local source of heating, a hot metal particle, under conditions of fuel burnout are studied. The influence of liquid fuel burnout on the ignition characteristics is analyzed, and the results of investigation of the extent of influence of this factor for solid and liquid condensed materials under conditions of local heating are compared. © Pleiades Publishing, Ltd., 2011.


Gromov A.A.,Tomsk Polytechnical Institute | Strokova Yu.I.,Tomsk Polytechnical Institute | Ditts A.A.,Tomsk Polytechnical Institute
Russian Journal of Physical Chemistry B | Year: 2010

The physicochemical regularities of the formation of passivating coatings on particles of aluminum electroexplosion nanopowders are examined by means of electron microscopy, X-ray diffraction, differential thermal, chemical analyses and X-ray photoelectron spectroscopy. The thermal characteristics of inorganic passivating coatings for aluminum nanoparticles were demonstrated to be more advantageous compared to organic coatings. The protective action of organic passivating coatings was shown to be independent of their composition - only the particle size was found to be important. © Pleiades Publishing, Ltd., 2010.


Kuznetsov G.V.,Tomsk Polytechnical Institute | Strizhak P.A.,Tomsk Polytechnical Institute
Russian Journal of Physical Chemistry B | Year: 2010

The process of gas-phase ignition of a liquid fuel film with incandescent small metal particles in the form of a parallelepiped, disk, or hemisphere was numerically simulated. The magnitude of influence of the particle shape on the delay time of ignition of a liquid fuel was determined. The range of parameters of the particle at which the effect of its shape on the ignition delay time is unimportant was established. © Pleiades Publishing, Ltd., 2010.


Kuznetsov G.V.,Tomsk Polytechnical Institute | Strizhak P.A.,Tomsk Polytechnical Institute
Russian Journal of Physical Chemistry B | Year: 2010

Numerical simulations were used to examine a set of interrelated physicochemical processes involved in the ignition of a liquid fuel film by a low-power laser beam. The delay time of ignition of a liquid fuel film and the ignition zone location were determined. The scale of influence of the power and radius of the laser beam on the ignition characteristics was determined. The ignition criteria of ignition were identified. © 2010 Pleiades Publishing, Ltd.


Kuznetsov G.V.,Tomsk Polytechnical Institute | Strizhak P.A.,Tomsk Polytechnical Institute
Russian Journal of Physical Chemistry B | Year: 2010

A theoretical analysis of the ignition of a liquid fuel vapor-air mixture by a moving small source of heating was performed. A gas-phase model of the ignition with consideration given to heat transfer, liquid fuel evaporation, diffusion and convective motion of fuel vapor in the oxidizer medium, crystallization of the heating source, kinetics of the vaporization and ignition processes, temperature dependence of the thermophysical characteristics of the interacting substances, and character of motion of the heating source in the vapor-gas mixture was developed. The values of the ignition delay time τd, the main characteristic of the process, were determined. It was established how τd depends on the initial temperature, heating source sizes, velocity and trajectory of the heating source, and ambient air temperature. © Pleiades Publishing, Ltd., 2010.


Baranov V.A.,Tomsk Polytechnical Institute | Ewert U.,BAM Federal Institute of Materials Research and Testing | Kroning H.M.,Saarland University | Brazovsky V.V.,Tomsk Polytechnical Institute | And 2 more authors.
Russian Journal of Nondestructive Testing | Year: 2011

Methods of nonlinear backprojection that are suitable for the solution of problems in tomography with small number of views are considered. Their comparison with the classical back-projection methods is performed. Examples of reconstructions are given; the fields in which back-projection methods are successfully applied are enumerated. © Pleiades Publishing, Ltd., 2011.

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