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9th International Conference on Interactive Collaborative Robotics, ICR 2024

作者： Filaretov, Vladimir Zuev, Aleksandr Timoshenko, Aleksandr Institute of Automation and Control Processes FEB RAS 5 Radio St. Vladivostok690041 Russia M.D. Ageev Institute of Marine Technology Problems FEB RAS 5a Sukhanova St Vladivostok690091 Russia Far Eastern Federal University 12/2 Mordovtseva St. Vladivostok690091 Russia

ISBN: (纸本)9783031713590

The paper proposes a new method for constructing dynamic models of underwater manipulators installed on board autonomous underwater vehicles. These models are designed to identify unknown parameters of the interaction of an underwater manipulator with a viscous medium during its movement. A feature of these models is that unknown parameters, including coefficients of added masses and damping coefficients, are included in the equations of dynamics of the manipulator linearly relative to known kinematic parameters. These coefficients can be determined using classical identification methods such as the least squares method or methods based on the application of the linear Kalman filter. The identified parameters can then be used in adaptive underwater manipulator control systems to implement automatic execution of underwater technological operations. To do this, the identification procedure must be carried out in close proximity to the intended working area of the underwater vehicle with a manipulator, where the desired coefficients can be considered constant. The correctness of the proposed models and the possibility of identifying these coefficients were verified during mathematical simulation of the movement of an underwater vehicle with a manipulator mounted on it at various initial parameters of a viscous medium. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Kalman filters

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Laser-induced periodic structures-assisted surface plasmon resonance refractive index sensor 8

Laser-induced periodic structures-assisted surface plasmon r...

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Plasmonics VIII 2024

作者： Bronnikov, Kirill Munkueva, Zhibzema Terentiev, Vadim Simonov, Victor Mikerin, Sergey Babin, Sergey A. Kuchmizhak, Aleksandr Dostovalov, Alexander Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave. Novosibirsk630090 Russia School of Physics and Engineering ITMO University St. Petersburg191002 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia Institute of Automation and Control Processes of the FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University Vladivostok690041 Russia

ISBN: (纸本)9781510682184

Laser-induced periodic surface structures (LIPSS) offer a simple, single-step technique for creating periodic patterns on solids in an ambient air. Combined with metals like gold or silver, LIPSS enhances grating-assisted refractive index (RI) sensors using surface plasmon resonance (SPR). This study analyzes an SPR sensor in the Kretschmann configuration with a periodically modulated silver layer. The modulation is created by LIPSS formed on a titanium-coated glass prism using femtosecond laser pulses, followed by a silver coating. Reflection spectra for wavelengths λ = 600-1700 nm were calculated for various angles of incidence and RI values (1.33-1.4). Unlike a flat sensor with a single resonance, the LIPSS-based sensor shows multiple resonances (λ = 1000-1700 nm) due to modes on inner and outer interfaces. LIPSS reduces resonance spectral width by an order of magnitude, but also reduces sensitivity similarly, weakly affecting the Figure of Merit. The LIPSS-assisted sensor was also tested experimentally. © 2024 SPIE.

关键词： Femtosecond lasers

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Formation of thermochemical laser-induced periodic structures on titanium films in a nitrogen-rich atmosphere 5

Formation of thermochemical laser-induced periodic structure...

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Advanced Laser Processing and Manufacturing V 2021

作者： Bronnikov, Kirill Dostovalov, Alexander Okotrub, Konstantin Kuchmizhak, Aleksandr Korolkov, Victor Babin, Sergey Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave. Novosibirsk630090 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia Institute of Automation and Control Processes of the FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University Vladivostok690041 Russia

ISBN: (数字)9781510646346

ISBN: (纸本)9781510646339

Recently, highly regular thermochemical laser-induced periodic surface structures (TLIPSS) have become the subject of active studies. TLIPSS are formed in the interference maxima due to the local oxidation of the material irradiated with ultrashort laser pulses and are characterized by the elevation of the relief that forms parallel oxide protrusions. The gas surrounding is expected to affect the morphology and chemical composition of the resulting TLIPSS;however, such effects were rarely studied so far. Here we present the results of the TLIPSS fabrication on glass-supported Si-Ti bilayer films using an astigmatic Gaussian IR femtosecond beam both in air and a nitrogen-rich atmosphere. The formation of ordered TLIPSS with the period of ≈ 920 nm is observed at slow scanning speeds (∼1 μm/s) and low fluences in a nitrogen-rich atmosphere. Raman spectroscopy revealed the presence of TiO2 (rutile) peaks, as well as bands centered at 280 cm-1 and 320 cm-1, which can be related to TiN in amorphous and polycrystalline phase. © 2021 SPIE.

关键词： Nitrogen

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Theoretica Study of a Tunable Optical Device on the Base of Magnetoactive Chiral Helically Structured Photonic Crystals

SSRN

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SSRN 2024年

作者： Gevorgyan, Ashot H. Vanyushkin, Nikolay A. Efimov, Ilya M. Kamenev, A.O. Malinchenko, A.A. Golik, S.S. Oganesyan, K.B. Far Eastern Federal University Institute of High Technologies and Advanced Materials 10 Ajax Bay Russky Island Vladivostok690922 Russia Institute of Automation and Control Processes Far East Branch Russian Academy of Sciences Vladivostok690041 Russia A. Alikhanyan National Lab Yerevan Physics Institute Alikhanyan Br.2 Yerevan0036 Armenia Institute of Experimental Physics SAS Watsonova 47 Kosice04001 Slovakia

We investigated the light reflection from half-space of cholesteric liquid crystal (CLC) being in external static magnetic field directed along the helix axis at normal light incidence. In this case there appear three photonic band gaps (PBGs) and these bands can be tuned in large intervals. We found the eigenpolarizations (EPs) at reflection of light from half-space and investigated their peculiarities. We have shown that in the absence both of absorption and of external magnetic field and at minimal influence of dielectric boundary (when the dielectric permittivity of isotropic half-space which borders with CLC half-space is equal to the CLC’s mean dielectric permittivity) these polarizations are orthogonal. While, in the presence of external magnetic field they become quasi-orthogonal everywhere outside the main PBG (which exist also at the absence of external magnetic field), and they are significantly non-orthogonal within the main PBG. At some values of helix pitch they become significantly non-orthogonal practically everywhere. Moreover, in this case there exist some special points where the EPs degenerate. This system can apply as tunable narrow-band or broad-band filter and mirror, a highly tunable broad/narrow-band optical diode, and other devices. © 2024, The Authors. All rights reserved.

关键词： Cholesteric liquid crystals

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On improved model of solid porous fuel gasification in low-temperature gas generator for flying vehicle

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AIP Conference Proceedings 2023年第1期2504卷

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

An improved mathematical model of solid porous fuel gasification in a combined charge of a low-temperature gas generator has been developed. For taking into account the change in the molar mass of the gas, a differential equation has been added to the model for determining the density of the gas that arising from solid fuel as a result of the gasification process. This allows one to determine the amount of gasification products and to accurately calculate the molar mass of the gas mixture at each point of the gas generator at each time. Calculations carried out using the refined model have shown that taking into account the change in molar mass of the gas can lead to significant changes in some of the unknown functions, such as the gas velocity and density. At the same time, the velocity of the gasification wave propagation changes very insignificantly. Thus, taking into account the change in molar mass of the gas has little effect on the estimation of the maximum operating time of the propulsion system.

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Simulation of gasification of solid porous fuel in a low-temperature gas generator of ramjet

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AIP Conference Proceedings 2023年第1期2504卷

作者： E. A. Salgansky N. A. Lutsenko L. S. Yanovskiy 1Institute of Problems of Chemical Physics Russian Academy of Sciences Chernogolovka Russia 2Institute of Automation and Control Processes Far Eastern Branch of the Russian Academy of Sciences Vladivostok Russia 3Far Eastern Federal University Vladivostok Russia 4Moscow Aviation Institute Moscow Russia

A low-temperature gas generator with a sequential arrangement of propellant and solid fuel for generating hydrocarbon gases is considered. The present work is devoted to the theoretical study of the regularities and mechanisms of gasification of solid porous fuel when hot gases with different fixed initial velocities pass through the fuel. The influence of the characteristics of solid fuel on the operating conditions of the gas generator has been investigated for polymethyl methacrylate, polyethylene, and hydroxyl-terminated polybutadiene. The shortest gas generator operation time is observed for polymethyl methacrylate and the longest for polyethylene. The maximum mass flow of polymethyl methacrylate gasification products is observed for the minimum initial gas velocity.

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On modeling the process of solid fuel sublimation in a combined charge of a low-temperature gas-generator in the OpenFOAM software

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AIP Conference Proceedings 2023年第1期2504卷

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

A novel computational method is proposed for studying the processes of solid fuel sublimation in a combined charge of a low-temperature gas generator. The method is based on the finite volume discretization and the SIMPLE algorithm and is implemented in the OpenFOAM software. The computational results are compared with those obtained by the previously developed finite-difference method, and the higher performance of the new model is revealed. Another advantage of the method is that it is more convenient for use, more flexible for certain modifications, and can be easily adapted for multidimensional problems.

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Crystallization of optically thick amorphous silicon films by near-ir femtosecond laser processing 5th

Crystallization of optically thick amorphous silicon films b...

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5th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2020

作者： Mitsai, Eugeny Dostovalov, Alexander Bronnikov, Kirill Nepomniaschiy, Alexander Zhizhchenko, Alexey Kuchmizhak, Aleksandr Institute of Automation and Control Processes FEB RAS 5 Radio St Vladivostok690041 Russia Institute of Chemistry FEB RAS 159 Pr-t. 100-letiya Vladivostoka Vladivostok690022 Russia Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave Novosibirsk630090 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia

ISBN: (纸本)9783035737936

We demonstrated efficient crystallization of amorphous Si films induced by their direct irradiation with near-IR femtosecond laser pulses coming at sub-MHz repetition rate. Comprehensive analysis of morphology and composition of the laser-annealed film by atomic-force microscopy, Fourier-transform IR, Raman and energy dispersive X-ray spectroscopy as well as numerical modeling of optical spectra confirmed efficient crystallization of amorphous Si and high-quality of the obtained films opening pathway for applications in thin-film solar cells, transistors and displays. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Amorphous silicon

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Soft-magnetic skyrmions induced by surface-state coupling in an intrinsic ferromagnetic topological insulator sandwich structure

arXiv

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arXiv 2021年

作者： Takashiro, Takuya Akiyama, Ryota Kibirev, Ivan A. Matetskiy, Andrey V. Nakanishi, Ryosuke Sato, Shunsuke Fukasawa, Takuro Sasaki, Taisuke Toyama, Haruko Hiwatari, Kota L. Zotov, Andrey V. Saranin, Alexander A. Hirahara, Toru Hasegawa, Shuji Department of Physics The University of Tokyo Bunkyo Toyko113-0033 Japan Institute of Automation and Control Processes Vladivostok690041 Russia Department of Physics Tokyo Institute of Technology Tokyo152-8551 Japan 1-2-1 Sengen Ibaraki Tsukuba305-0047 Japan

A magnetic skyrmion induced on a ferromagnetic topological insulator (TI) is a real-space manifestation of the chiral spin texture in the momentum space, and can be a carrier for information processing by manipulating it in tailored structures. Here, we fabricate a sandwich structure containing two layers of a self-assembled ferromagnetic septuple-layer TI, Mn(Bi1-xSbx)2Te4 (MnBST), separated by quintuple layers of TI, (Bi1-xSbx)2Te3 (BST), and observe skyrmions through the topological Hall effect in an intrinsic magnetic topological insulator for the first time. The thickness of BST spacer layer is crucial in controlling the coupling between the gapped topological surface states in the two MnBST layers to stabilize the skyrmion formation. The homogeneous, highly-ordered arrangement of the Mn atoms in the septuple-layer MnBST leads to a strong exchange interaction therein, which makes the skyrmions "soft magnetic". This would open an avenue towards a topologically robust rewritable magnetic memory. Copyright © 2021, The Authors. All rights reserved.

关键词： Ferromagnetism

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A novel OpenFOAM solver for modelling thermo- and fluid dynamic processes in porous media

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AIP Conference Proceedings 2023年第1期2504卷

作者： Sergey S. Fetsov Alina S. Kim 1Institute of Automation and Control Processes FEB RAS 5 Radio st. Vladivostok Russia 2Far Eastern Federal University 10 p. Ajax Vladivostok Russia

A novel computational model based on the finite volume method is proposed for studying processes in heat-evolutional porous media. The developed model is implemented in OpenFOAM software. The problem of one-dimensional time-dependent gas flow through a porous heat-releasing medium is considered for testing the model. The computational results are compared with those obtained by the previously developed numerical procedure based on the finite difference method, and it is found that the performance of the proposed method is better than that of previously developed one.

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