Materials physics and mechanics

RAR RUS 87-91 Belarusian State University of Informatics and Radioelectronics Danilyuk

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Podryabinkin

Minsk, Belarus

Plasma-mechanical oscillations in carbon nanotubes array The results of the simulation of plasma-mechanical oscillations in carbon multiwalled nanotubes array under electromagnetic radiation are presented considering thermal fluctuations, internal stress, static load and the ponderomotive forces between the nanotubes. carbon nanotubes; plasma-mechanical oscillations; electromagnetic radiation; mechanical stress https://mpm.spbstu.ru/article/2014.34.1/ MPM220_01_danilyuk.pdf

RAR RUS 92-97 Peter the Great St. Petersburg Polytechnic University Sanin

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Semyonov

St.Petersburg, Russia

Quantum quartic oscillators with two coupled degrees of freedom The numerical integration of the non-stationary two-dimensional Schrödinger equation is carried out. The dynamical properties (dynamical averages, frequency spectra, uncertainty relations, autocorrelators) for two quantum oscillators coupled by the Pallen- Edmonds potential are studied. As a result of the numerical simulations, it was established that the quantum system is sensitive to small changes in Hamiltonian that are caused by the Pallen-Edmonds coupling potential. In the regime of weak coupling high-frequency oscillations are generated, the spectral component number is increased at amplification of coupling. non-stationary two-dimensional Schrödinger equation; quantum oscillator; Pallen-Edmonds potential https://mpm.spbstu.ru/article/2014.34.2/ MPM220_02_sanin.pdf

RAR RUS 98-105 Peter the Great St. Petersburg Polytechnic University Sanin

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Smirnovsky

St.Petersburg, Russia

Computer simulation of quantum systems with friction and feedback Dynamics of wave packets in quantum systems subjected to a friction force and impulse feedback is investigated in context of Schrödinger-Langevin-Kostin (SchLK) equation. The quantum systems with a quadratic potential bounded by impenetrable walls of a well are presented as examples. Numerical simulations are carried out for initial Gaussian packet at varied values of a friction coefficient and amplitudes of the impulse feedback. Informative and structural properties of the wave packets are analyzed by using Fourier transform of dynamical variables and theirmeans, of autocorrelation Nauenberg’s function. Coherent oscillations of the wave packets and transition to chaotic dynamics are found. Influence of friction on oscillatory dynamics is discussed. quantum systems with friction and feedback; Schrödinger-Langevin-Kostin equation https://mpm.spbstu.ru/article/2014.34.3/ MPM220_03_sanin.pdf

RAR RUS 106-110 Belarusian State University of Informatics and Radioelectronics Sidorova

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Danilyuk

Minsk, Belarus

Negative differential resistance in ferromagnet/wide-gap semiconductor/ferromagnet nanostructure The model of charge carrier transport in ferromagnet/wide-gap semiconductor/ ferromagnet nanostructure based on two-band Franc-Keine model and phase function method was proposed. It is determined that tunneling barrier, formed by the gap of wide-gap semiconductor, does not represent potential step, but the energy band gap. Its upper border is the bottom of the conduction band EC, and the bottom part is the top of the valence band EV. Inside this zone wave vector of the electron is an imaginary value. According to the dispersion law, states located in the midgap sustain the largest attenuation. That is why when the Fermi level of the analyzed structure lies in the bottom part of the band-gap, bias voltage V shifts levels of the tunneling electrons to a low barrier area. This shifting is thereason of the tunneling current reduction and leads to the negative differential resistance effect. It is shown that areas of the negative differential resistance effect appear at the current-voltage bias dependence at qV> EF. Here areas of negative differential resistance should be expected at the voltage values higher than Fermi energy value of the emitting electrode for the zone electrons with the spin-up. ferromagnetic; wide-gap semiconductor; two-band model; phase function method; negative differential resistance; nanostructure https://mpm.spbstu.ru/article/2014.34.4/ MPM220_04_sidorova.pdf

RAR RUS 111-117 Belarusian State University of Informatics and Radioelectronics Lovshenko

St.Petersburg, Russia

Belarusian State University of Informatics and Radioelectronics Stempitsky

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Trung

St.Petersburg, Russia

Device and technology simulation of IGBT on SOI structure Results of computer simulation of manufacturing a bipolar transistor with insulated gate (IGBT) on the base of technology “Silicon on insulator” (SOI) are presented. Current-voltage characteristics of the investigated IGBT device were calculated. The results obtained were used as a base for optimization of the most significant technological parameter, a gate oxide thickness. It is shown that the gate oxide thickness has a significant impact on the electrical characteristics of the IGBT. The calculated values of the switch-on and switch-off times less than one order, and the value of the collector current is more than two orders of magnitude for the vertical structure of the IGBT based on bulk silicon in comparison with IGBT on SOI structure. IGBT; SOI; computer simulation of manufacturing https://mpm.spbstu.ru/article/2014.34.5/ MPM220_05_lovshenko.pdf

RAR RUS 118-123 Peter the Great St. Petersburg Polytechnic University Kuznetsova

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Urvantseva

St.Petersburg, Russia

Using torsional vibrations for determining moment of inertia of a disc In this contribution we report on the execution of a real laboratory work on the determination of moment of inertia for a circular disc in order to check Steiner theorem using the experimental setup of the company PHYWE. The results obtained are subjected to mathematical treatment of the basis of mathematical statistics. Analyzing the results, the students have possibility to compare them with the theoretical ones. Experiment planning, modeling and estimating the quality of models developed during the fulfillment of a real laboratory work helps to form research skills of the students. Steiner theorem; moment of inertia; a circular disc https://mpm.spbstu.ru/article/2014.34.6/ MPM220_06_kuznetsova.pdf

RAR RUS 124-129 Peter the Great St. Petersburg Polytechnic University Bezrukova

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Vlasova

St.Petersburg, Russia

Optical characterization of 3D disperse systems with nano- and micro particles: light scattering matrix elements The multiparametric analysis of simultaneous optical data for nano and micro particle systems (ensembles, colloids, dispersions) by presentation of system characteristics as N-dimensional optical parameter vectors can help to elucidate differences or changes in the state of particles, the process of particle interactions, the particle share in mixtures and so on. In this paper, the light scattering matrix elements application as vector parameters is shown on the examples of influenza virus and colibacillus dispersions. This optical parameter ND vectors can serve as the innovative research platform for sensing different particle interfaces including biological ones. colibacillus; influenza virus; light scattering matrix elements; N-dimensional optical parameter vectors; nano and micro particle systems; on-line control; optical characterization https://mpm.spbstu.ru/article/2014.34.7/ MPM220_07_bezrukova.pdf

RAR RUS 130-141 Belarusian State University Kuleshov

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Stempitsky

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Volchek

Minsk, Belarus

Institute of Microbiology, National Academy of Sciences Kolomiets

Minsk, Belarus

Institute of Microbiology, National Academy of Sciences Berezhnaya

Minsk, Belarus

Institute of Microbiology, National Academy of Sciences Kuptsov

Minsk, Belarus

Modeling of microbial synthesis processes considering inoculums immobilization in porous nanostructured media The results of analytical relationships refinement based on the system of differential equations application of material balance for microbiological synthesis batch process are presented. Improved technique for solving the system is based on the definition of potential energy batch of microbiological synthesis and new formula of specific growth rateof microorganisms’ biomass concentration. microbiological synthesis; modeling; the system of differential equations https://mpm.spbstu.ru/article/2014.34.8/ MPM220_08_kuleshov.pdf

RAR RUS 142-147 Peter the Great St. Petersburg Polytechnic University Igolkin

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Melker A.I.

St.Petersburg, Russia

Structure of shock waves arising in underwater explosion In this contribution we report on modeling underwater explosion in the framework of molecular dynamics. Calculations displayed the striking resemblance of the underwater explosions modeled and those of observed in real processes; namely, generation of a shock wave and its expanding; formation of a cavity; disintegrating the shock wave, when reaching a surface, transforming the cavity into a water crater of an arising water volcano. For studying the structure of shock waves, a special technique was developed. It allowed observing the form of a shock wave and estimating its velocity. It was found that the shape of a shock wave is changing with time as if the shock wave disintegrated into two parts. shock waves; underwater explosion; modeling https://mpm.spbstu.ru/article/2014.34.9/ MPM220_09_igolkin.pdf

RAR RUS 148-152 Peter the Great St. Petersburg Polytechnic University Igolkin

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Melker A.I.

St.Petersburg, Russia

Molecular hydrodynamics of shallow-water explosions In this contribution we report on modeling underwater explosion in the framework of molecular dynamics. We have developed a computer program which allows studying the underwater explosion in two dimensional Lennard . Jones liquid. Calculations of the dynamical structure of underwater explosion displayed the striking resemblance of the underwater-explosion evolution obtained and those of observed in the real process. For studying the structure of shock waves, a special technique was developed. It allowed observing the form of a shock wave and estimating its velocity. The most striking result of the investigation is that the form of the shock wave in a shallow water explosion has an evident wavy character similar to electromagnetic shock waves. underwater explosion; modeling; molecular hydrodynamics https://mpm.spbstu.ru/article/2014.34.10/ MPM220_10_igolkin.pdf

RAR RUS 159-174 Peter the Great St. Petersburg Polytechnic University Melker A.I.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Igolkin

St.Petersburg, Russia

Molecular hydrodynamics of deep-water explosions In this contribution we report on modeling underwater explosion in the framework of molecular dynamics. We have developed a computer program which allows studying the underwater explosion in two dimensional Lennard - Jones liquid. For studying the structure of shock waves, a special technique was developed. It allowed observing the form of a shock wave and estimating its velocity. The most striking result of the investigation is that the shape of a shock wave is changing with time as if the shock wave disintegrated into two parts. The phenomenon is analyzed similar to the approach accepted for solitons. An equation for two-dimensional shock waves which generalizes the Korteweg-de Vries equation for a one-dimensional medium is suggested. underwater explosion; molecular hydrodynamics; modeling https://mpm.spbstu.ru/article/2014.34.11/ MPM220_11_igolkin.pdf

RAR RUS 175-185 Peter the Great St. Petersburg Polytechnic University Silnikov

St.Petersburg, Russia

Special Materials, Corp. Sadyrin

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Mikhaylin

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Orlov

St.Petersburg, Russia

Shock wave overpresure evaluation at blast detonation inside a destructible container The article proposes a technique of blast-wave-pressure-express evaluation at a charge detonation inside a working space of the multi-camera container confined in an envelope filled with a multi-phase medium. The technique is based on a quasi-stationary symmetrical model of the container deformation. Calculated values of shock wave overpressures have been compared with experimentally obtained data for TNT charge detonations in the working space of various blast liquid inhibitors shock wave overpressure; multi-camera container deformation; quasi-stationary symmetrical model https://mpm.spbstu.ru/article/2014.34.12/ MPM220_12_silnikov.pdf