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On Finite Displacement of an Elastoviscoplastic Material in a Gap between Two Rigid Coaxial Cylindrical Surfaces

Journal of Applied and Industrial Mathematics 2018年第1期12卷 84-97页

作者： Kovtanyuk, L.V. Panchenko, G.L. Institute of Automation and Control Processes ul. Radio 5 Vladivostok690041 Russia Institute of Machinery and Metallurgy ul. Metallurgov 1 Komsomolsk-on-Amur681005 Russia Vladivostok State University of Economics and Service ul. Gogolya 41 Vladivostok690014 Russia

In the framework of the theory of large deformations, we obtain the solution of a boundary value problem on the flow of an elastoviscoplastic material in a gap between two rigid coaxial cylindrical surfaces under pressure drop changing with time. It is assumed that slip of the material is possible on both surfaces. We consider reversible deformation, the development of viscoplastic flow under the increasing and constant pressure drop, deceleration of the flow under the decreasing pressure drop, and the unloading of the medium. © 2018, Pleiades Publishing, Ltd.

关键词： Drops

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Calculation of Resonant Frequencies of Silicon AFM Cantilevers

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Journal of Physics: Conference Series 2020年第1期1439卷

作者： T A Efimov E A Rassolov B G Andryukov T S Zaporozhets R V Romashko Optoelectronics Department Institute of Automation and Control Processes FEB RAS Vladivostok Radio street 5 690041 Russia Far-Eastern Federal University Sukhanova street 8 Vladivostok 690950 Russia G.P. Somov Research Institute of Epidemiology and Microbiology FEB RAS Vladivostok Selskya street 1 690087 Russia

A theoretical study of the quality and the validity range of different numerical and analytical methods of calculating of the frequency shift in measurement using microcromechanical sensor is presented. This work considered a calculating method for natural frequency in comparison with experimentally measured oscillation frequencies of microcromechanical sensor immersed in air and/or viscous medium. The numerical methods for solving the equation of resonance oscillation of the console fixed on one side are considered for calculating the natural oscillation frequencies of standard AFM cantilevers.

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Designing reverse converter for data transmission systems from two-level RNS to BNS

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Journal of Physics: Conference Series 2020年第1期1658卷

作者： M V Bergerman P A Lyakhov A S Voznesensky D V Bogaevskiy D I Kaplun Department of Applied Mathematics and Mathematical Modeling Institute of mathematics of Natural Sciences North Caucasus Federal University ul. Pushkina 1 355009 Stavropol Russia Department of Automation and Control Processes Saint Petersburg Electrotechnical University 'LETI' ul. Professora Popova 5 197376 Saint Petersburg Russia

In this paper, we present a reverse conversion from a two-stage Residue Number System (RNS) to a Binary Number System (BNS) with a special set of level 1 modules {2α1, 2α2 − 1, ..., 2αn − 1} and level 2 modules {2β1, 2β2 − 1, ..., 2βk − 1}. The proposed method is based on the Chinese Remainder Theorem (CRT) with fractions and using a calculation method that uses constant multiplications to speed up calculations. This article discusses the simulation of FPGA reverse conversion to a two-stage RNS using the proposed method and the standard CRT using adders, their comparison of latency and hardware costs.

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On some features of vortex gas flows in porous objects with heterogeneous combustion zones under natural convection

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AIP Conference Proceedings 2018年第1期2027卷

作者： Nickolay A. Lutsenko 1Institute of Automation and Control Processes FEB RAS Vladivostok Russia 2Far Eastern Federal University Vladivostok Russia

Using numerical experiment two-dimensional unsteady processes of heterogeneous combustion in porous objects under free convection have been investigated. Combustion is due to the exothermic reaction between the fuel in the porous solid medium and oxidizer contained in the gas flowing through the porous object. In considered porous objects the gas pressure at object permeable boundaries is known but the flow rate and velocity of the gas at these boundaries are unknown, so the flow rate of oxidant, which enters into the reaction zone in porous object, regulates itself. Various objects with combustion zones resulting from natural and man-made disasters (in particular, peatlands, coal dumps, landfills) can be modeled, in terms of mechanics, as such porous objects. An original numerical method, based on a combination of explicit and implicit finite-difference schemes, is used for investigating the two-dimensional time-dependent combustion waves in considered porous objects. It has been revealed that when the natural convection takes place, the vortex-type gas flows can occur in the combustion zone and in its vicinity. It has been revealed that sometimes the complex gas flows within the porous object under natural convection are able to restrict the oxidant supply into the combustion zone and to extinguish the fire.

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On influence of inertial component of resistance force on gas flow through the porous heat-releasing media

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AIP Conference Proceedings 2018年第1期2027卷

作者： K. G. Borovik 1Institute of Automation and Control Processes of the FEB RAS 690041 Vladivostok Russia 2Far Eastern Federal University 690091 Vladivostok Russia

Stationary gas flow through the porous heat-releasing object with known gas pressure difference at opened boundaries of the object and unknown gas flow rate with accounting the inertial component of resistance is considered. The analytical solution of this problem is obtained under certain simplifying conditions and analyzed in a wide range of problem parameters. Deviation of the gas temperature and velocity, which is defined as difference between values with and without accounting the quadratic term in motion equation, is investigated. It is shown that taking into account the quadratic velocity in motion equation can significantly impact on the problem solution even at relative small pressure difference at the objects boundaries. It is shown analytically that when taking into account the inertial component of resistance, the gas filtration velocity has an asymptotic dependence from pressure difference at opened boundaries.

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On influence of gas compressibility on gas flow through bed of granular phase change material

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AIP Conference Proceedings 2018年第1期2027卷

作者： S. S. Fetsov 1Institute of Automation and Control Processes FEB RAS Vladivostok 690041 Russia 2Far Eastern Federal University Vladivostok 690950 Russia

Influence of gas compressibility on gas motion through a bed of granular phase change material (PCM) is investigated. Solutions of two problems of the gas flow through the granular bed with accounting the gas compressibility and without it are compared for this purpose. It is found that neglecting the gas compressibility in simulating the granular PCM can provide significant deviation of full heating time of the bed. The result can be used at modelling of thermal energy storage with granular PCM.

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Dielectric cross-shaped resonator based metasurface for vortex beam generation in Mid-IR and THz wavelengths

arXiv

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arXiv 2019年

作者： Dharmavarapu, Raghu Izumi, Ken-Ichi Katayama, Ikufumi Ng, Soon Hock Vongsvivut, Jitraporn Tobin, Mark J. Kuchmizhak, Aleksandr Nishijima, Yoshiaki Bhattacharya, Shanti Juodkazis, Saulius Department of Electrical Engineering Indian Institute of Technology Madras Chennai600036 India Centre for Micro-Photonics Faculty of Science Engineering and Technology Swinburne University of Technology HawthornVIC3122 Australia Melbourne Centre for Nanofabrication ANFF 151 Wellington Road ClaytonVIC3168 Australia Physics Department Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan Infrared Microspectroscopy Beamline Australian Synchrotron ClaytonVIC3168 Australia Institute of Automation and Control Processes Far Eastern Branch Russian Academy of Sciences Vladivostok690041 Russia Far Eastern Federal University Vladivostok690090 Russia Department of Electrical and Computer Engineering Graduate School of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan Institute of Advanced Sciences Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo152-8550 Japan

Metasurfaces are engineered thin surfaces comprising two dimensional (2D) arrays of sub-wavelength spaced and sub-wavelength sized resonators. Metasurfaces can locally manipulate the amplitude, phase and polarization of light with high spatial resolution. In this study, we report numerical and experimental results of a vortex-beam-generating metasurface fabricated specifically for infrared (IR) and terahertz (THz) wavelengths. The designed metasurface consisted of a 2D array of dielectric cross-shaped resonators with spatially varying length, thereby providing desired spatially varying phase shift to the incident light. The metasurface was found to be insensitive to polarization of incident light. The dimensions of the cross-resonators were calculated using rigorous finite difference time domain (FDTD) analysis. The spectral scalability via physical scaling of meta resonators was demonstrated using two vortex generating optical elements operating at 8.8 μm (IR) and 0.78 THz (Terahertz). The vortex beam generated in the mid-IR spectral range was imaged using FTIR imaging miscroscope equipped with a focal plane array (FPA) detector. This design could be used for efficient wavefront shaping as well as various optical imaging applications in mid-IR spectral range, where polarization insensitivity is desired. Copyright © 2019, The Authors. All rights reserved.

关键词： Resonators

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Ultrashort pulse action onto thin film on substrate: Qualitative model of shock propagation in substrate explaining phenomenon of fast growth of a hole with increase of absorbed energy

arXiv

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arXiv 2018年

作者： Shepelev, V.V. Inogamov, N.A. Khokhlov, V.A. Danilov, P.A. Kudryashov, S.I. Kuchmizhak, A.A. Vitrik, O.B. Institute for Computer-Aided Design of the Russian Academy of Sciences Vtoraya Brestskaya 19/18 Moscow123056 Russia Landau Institute for Theoretical Physics of the Russian Academy of Sciences Akademika Semenova 1a Chernogolovka Moscow Region142432 Russia Sushchevskaya 22 Moscow127055 Russia Lebedev Physical Institute of the Russian Academy of Sciences Leninsky Avenue 53 Moscow119991 Russia Institute of Automation and Control Processes of the Far Eastern Branch of the Russian Academy of Sciences Radio 5 Vladivostok Primorsky Krai690041 Russia School of Natural Sciences Far Eastern Federal University Sukhanova 8 Vladivostok Primorsky Krai690041 Russia

Thin films on substrate are important class of targets for surface nanomodification for plasmonic or sensoric applications. There are many papers devoted to this problem. But all of them are concentrated on dynamics of a film, paying small attention to substrate. In these papers the substrate is just an object absorbing the first shock. Here we present another point of view directed onto dynamics of a substrate. We consider (i) generation of a shock wave (SW) in a support by impact of a contact;(ii) transition from one-dimensional to two-dimensional (2D) propagation of SW;(iii) we analyze lateral propagation of the SW along a film-support contact;and (iv) we calculate pressure in the compressed layer behind the decaying SW. This positive pressure acting from substrate to the film accelerates the film in direction to vacuum. Above some threshold, velocity of accelerated film is enough to separate the film from support. In these cases the circle of separation is significantly wider than the circle of the focal laser spot on film surface. Absorbed laser heat exponentially decays around an irradiated spot F = Fc exp(−r2/RL2 ), where RL is radius of a Gaussian beam, F and Fc are local and central fluences, r is a radius from the axis. While the law of decay for the 2D SW in substrate is the power law. Therefore in our case of powerful laser action the edge of a separation circle is defined by propagation of the SW in the support. Copyright © 2018, The Authors. All rights reserved.

关键词： Shock waves

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Exciton photoluminescence of SiO2 nanoparticle powder

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AIP Conference Proceedings 2017年第1期1874卷

作者： A. V. Amosov V. P. Dzyuba Yu. N. Kulchin 1Institute of Automation and Control Processes FEB Russian Academy of Sciences 5 Radio Street Vladivostok Primorskiy kray 690041 Russia

The paper reports the study of photoluminescence (PL) of disc- and elliptical-shaped SiO2 nanoparticles exited by photons with energy lower than silica bandgap. Differences in the PL spectra are found to be associated...

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Ultrashort pulse action onto thin film on substrate: Qualitative model of shock propagation in substrate explaining phenomenon of fast growth of a hole with increase of absorbed energy

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Journal of Physics: Conference Series 2019年第1期1147卷

作者： V V Shepelev N A Inogamov P A Danilov S I Kudryashov A A Kuchmizhak O B Vitrik Institute for Computer-Aided Design of the Russian Academy of Sciences Vtoraya Brestskaya 19/18 Moscow 123056 Russia Landau Institute for Theoretical Physics of the Russian Academy of Sciences Akademika Semenova 1a Chernogolovka Moscow Region 142432 Russia Dukhov Research Institute of Automatics (VNIIA) Sushchevskaya 22 Moscow 127055 Russia Lebedev Physical Institute of the Russian Academy of Sciences Leninsky Avenue 53 Moscow 119991 Russia Institute of Automation and Control Processes of the Far Eastern Branch of the Russian Academy of Sciences Radio 5 Vladivostok Primorsky Krai 690041 Russia School of Natural Sciences Far Eastern Federal University Sukhanova 8 Vladivostok Primorsky Krai 690041 Russia

Thin films on substrate are important class of targets for surface nanomodification for plasmonic or sensoric applications. There are many papers devoted to this problem. But all of them are concentrated on dynamics of a film, paying small attention to substrate. In these papers the substrate is just an object absorbing the first shock. Here we present another point of view directed onto dynamics of a substrate. We consider (i) generation of a shock wave (SW) in a support by impact of a contact; (ii) transition from one-dimensional to two-dimensional (2D) propagation of SW; (iii) we analyze lateral propagation of the SW along a film-support contact; and (iv) we calculate pressure in the compressed layer behind the decaying SW. This positive pressure acting from substrate to the film accelerates the film in direction to vacuum. Above some threshold, velocity of accelerated film is enough to separate the film from support. In these cases the circle of separation is significantly wider than the circle of the focal laser spot on film surface. Absorbed laser heat exponentially decays around an irradiated spot , where RL is radius of a Gaussian beam, F and F c are local and central fluences, r is a radius from the axis. While the law of decay for the 2D SW in substrate is the power law. Therefore in our case of powerful laser action the edge of a separation circle is defined by propagation of the SW in the support.

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