Saint Petersburg, Russia
Saint Petersburg, Russia

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Stepashkina A.S.,Saint Petersburg State University | Aleshin A.N.,RAS Ioffe Physical - Technical Institute | Rymkevich P.P.,Mozhaiskii Military Space Academy
Physics of the Solid State | Year: 2015

A composite material based on a polypropylene matrix and carbon fillers has been fabricated in the form of films and blocks. It has been shown that the dependence of the resistivity of the composite on the filler weight fraction has a threshold character. The current-voltage characteristics of composite films have been measured at different temperatures in the range of 80–360 K. The temperature dependence of the resistivity of the composites at different filler weight fractions has been found. A theoretical description of current-voltage characteristics at different temperatures has been presented. © 2015, Pleiades Publishing, Ltd.


Krasnov V.M.,Mozhaiskii Military Space Academy | Kuleshov Y.V.,Mozhaiskii Military Space Academy
Acoustical Physics | Year: 2014

The variation in the spectrum of an infrasonic signal emitted by a point source during its propagation from Earth's surface to ionospheric altitudes and its effect on the ionosphere are considered from model calculations. © 2014 Pleiades Publishing, Ltd.


Sasunkevich A.A.,Mozhaiskii Military Space Academy | Sorokin L.N.,Polytechnic University of Mozambique | Usychenko V.G.,Polytechnic University of Mozambique
Journal of Communications Technology and Electronics | Year: 2016

Burnout of silicon transistors under the action of a periodic train of electric pulses is experimentally studied. A numerical model and a more physically demonstrative analytical model of the pulse-to-pulse heat accumulation are in qualitative and, to a certain extent, quantitative agreement with the measured results. It is demonstrated that catastrophic failure takes place at a melting point of silicon but additional heat is needed for melting of low-temperature eutectics. © 2016, Pleiades Publishing, Inc.


Ivanov V.F.,Mozhaiskii Military Space Academy | Myslivtsev T.O.,Mozhaiskii Military Space Academy | Troitskii B.V.,Mozhaiskii Military Space Academy
Geomagnetism and Aeronomy | Year: 2013

The paper discusses how the trajectory calculation method can be used to solve the problem of locality determination of shortwave (SW) emission sources. The dependence of the electron concentration on the coordinates is specified using the SPIM model; it is corrected using the ionospheric solar activity index, which is specified with the help of maps of total electron content. We suggested a variant of how a regional map of the total electron content can be plotted according to measurements of signals from GLONASS/GPS navigation systems. It is shown that the trajectory calculation method, coupled with an adjustable ionospheric model, allows for a more exact locality determination of SW radio emission sources. © 2013 Pleiades Publishing, Ltd.


Shuleikin V.N.,Russian Academy of Sciences | Shchukin G.G.,Mozhaiskii Military Space Academy
Russian Meteorology and Hydrology | Year: 2015

Increase in the amplitudes of microseisms within the range from the tenths of hertz to 10 kHz leads to increase in the values of air polar conductivity and to decrease in atmospheric electric field. As the frequency of microseisms decreases, the efficiency of microseismic impact increases. In case of low amplitudes of microseisms, decrease in atmospheric electric field is observed only as a result of multimonth active impact on the geologic environment. © 2015, Allerton Press, Inc.


Smagin V.A.,Mozhaiskii Military Space Academy
Automatic Control and Computer Sciences | Year: 2014

A brief history of introducing the delta function on a complex plane is presented. The proof of the mathematical form of the complex delta function is given. An example of applying the complex delta function for finding the stationary value of an alternating random accumulation process with the informational income and expenditure is presented. © 2014 Allerton Press, Inc.


Sadin D.V.,Mozhaiskii Military Space Academy | Alekseev K.V.,Mozhaiskii Military Space Academy
Technical Physics | Year: 2016

We report on the results of analysis of numerical scenarios for motion of a dust cloud interacting with a Knudsen gas flow. Two types of evolution of the dust formation are observed: regular, in which the characteristic points of the cloud are attracted to attractors, or the development of instability in a bounded region. © 2016, Pleiades Publishing, Ltd.


Zhukov V.Y.,Mozhaiskii Military Space Academy | Shchukin G.G.,Mozhaiskii Military Space Academy
Russian Meteorology and Hydrology | Year: 2014

Discussed are the problems arising in the process of creating a new network of DMRL-C weather radars in Russia. Compared are the potentials of these new and previous radars. Measured characteristics of the received signal and the algorithms of their assessment are briefly described. It is concluded that the programs of the secondary processing of information correspond to the potential of DMRL-C incompletely. It is proposed to speed up the development of methodological documents regulating the operation of the new network and working out additions to the secondary processing of information. Considered is a possibility of supplementing the developed network with small-sized weather radars in stalled in the areas of the most probable formation of such hazardous phenomena as tornados and heavy showers. © 2014 Allerton Press, Inc.


Pirogov S.Y.,Mozhaiskii Military Space Academy
Technical Physics | Year: 2013

The spatio-temporal gasdynamic structures of plasma formations produced in a hypersonic air flow by a focused high-power laser beam are analyzed numerically using the model of inviscid non-heat-conducting equilibrium radiating air. The reasons for the emergence of pulsating gasdynamic nonuniformity in the region between the bow shock wave and the intense laser radiation absorption zone are investigated. © 2013 Pleiades Publishing, Ltd.


Sadin D.V.,Mozhaiskii Military Space Academy | Varvarskii V.M.,Mozhaiskii Military Space Academy
Journal of Applied Mechanics and Technical Physics | Year: 2016

Results of an analysis of two-dimensional unsteady exhaustion of a one-velocity gas–particle medium into vacuum for limiting equilibrium cases of heat transfer between the phases are reported. Domains of existence of a one-dimensional Riemann wave and a lateral expansion wave, as well as boundaries of the flow expansion region are determined. Under thermal equilibrium conditions, the reverse flow is found to occupy a large domain extending beyond the boundaries defined by angles of expansion for an ideal gas and for a gas–particle mixture with thermally insulated phases. Exhaustion of a nonequilibrium (in terms of velocities and temperatures) two-phase medium into vacuum is numerically simulated. It is demonstrated that a barrel-shaped structure with wave expansion of the gas and a combined discontinuity in the expanding gas–particle mixture is formed. © 2016, Pleiades Publishing, Ltd.

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