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Structure, optical properties and resistance to laser radiation of thin barium disilicide films grown on silicon

Journal of Physics: Conference Series 2019年第1期1236卷

作者： N G Galkin K N Galkin V L Dubov D V Fomin C A Pyachin Institute of Automation and Control Processes FEB RAS 5 Radio Street Vladivostok 690041 Russia Amur State University Ignatievskoe shosse 21 Blagoveshchensk 675027 Russia Institute of Materials Science of Khabarovsk Scientific Center FEB RAS Tikhookeanskaya Street 153 Khabarovsk 680042 Russia

Polycrystalline and oriented films of barium disilicide (BaSi2) with a thickness of up to 100 nm were formed on silicon (111) substrates by high-temperature (800 ° C) solid-phase (single-stage and two-stage) annealing. The single phase of barium disilicide films and their semiconductor nature have been proven to be below 1.25 eV according to X-ray and optical spectroscopic methods. Two preferential orientations of the BaSi2 crystallites were detected and their orientation was determined in the films formed by two-stage annealing. According to the calculations of the parameters of the crystal structure of BaSi2 films, a compression of the unit cell volume from 2.7% to 5.13% was found, depending on the cooling time to room temperature. The stability of the films to laser radiation was studied by registering the Raman spectra with a variable power of laser radiation. The maximum power density of the laser beam (3⋅109 W/m2), which does not lead to the beginning of the destruction of these films, was determined.

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Research of the mechanical parameters of silicon membranes for acoustic sensors

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Journal of Physics: Conference Series 2020年第1期1695卷

作者： S V Malokhatko E Yu Gusev E A rassolov A M Khannanov O A Ageev Department of Nanotechnologies and Microsystems Southern Federal University Taganrog 347922 Russia Optoelectronics Department Institute of Automation and Control Processes Far Eastern Branch of the Russian Academy of Sciences (IACP FEB RAS) Vladivostok 690041 Russia Department of ship energy and automation School of Engineering Far Eastern Federal University Vladivostok 690091 Russia Research and Education Center 'Nanotechnologies' Southern Federal University Taganrog 347922 Russia

This paper presents the results of modeling and fabrication of silicon membranes for acoustic sensors with resonant frequency from 2 kHz to 60 kHz and pressures from 0.1 to 14 Pa. An analysis of the constructive and mechanical parameters of monocrystalline silicon membranes is performed. The range of membrane edge length (6-20 mm) at a fixed thickness of 50 μm determined. The etching process of a silicon wafer by anisotropic wet etching was studied. A process flow for manufacturing silicon membranes is proposed. The results of experimental studies of amplitude-frequency characteristic of membranes are obtained.

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On the modelling of the extraction process of rare metals from metal-containing systems by the method of filtration combustion

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Journal of Physics: Conference Series 2019年第1期1268卷

作者： N A Lutsenko E A Salgansky Institute of Automation and Control Processes FEB RAS Vladivostok 690041 Russia Far Eastern Federal University Vladivostok 690950 Russia Institute of Problems of Chemical Physics Russian Academy of Sciences Chernogolovka 142432 Russia

Numerical modelling of heterogeneous combustion in porous media with phase transitions is considered. To describe the propagation of time-dependent one-dimensional waves of heterogeneous combustion of metal-containing mixtures, a mathematical model and a numerical method are proposed. The model is based on the assumption of interacting interpenetrating continua using classical approaches of the theory of filtration combustion and includes equations of state, continuity, momentum conservation and energy for each phase. The numerical method is based on a combination of explicit and implicit finite difference schemes. The carried out numerical calculations showed the efficiency of the proposed model and allowed one to detect the concentration of the condensed metal near the front of the combustion wave.

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Electrostatic Field Influence on Luminescence Features of Cadmium Sulphide Quantum Dots in Silica Matrix

Electrostatic Field Influence on Luminescence Features of Ca...

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International Conference on Photonics of Nano- and Bio-Structures, PNBS-2015, Russia and the International Conference on Photonics of Nano- and Micro-Structures, PNMS-2015

作者： Voznesenskiy, S.S. Sergeev, A.A. Postnova, I.V. Shchipunov, Y.A. Institute of Automation and Control Processes FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University 8 Sukhanova St. Vladivostok690950 Russia Institute of Chemistry of FEB RAS 159 Prosp. 100-Letiya Vladivostoka Vladivostok690022 Russia

The effect of electrostatic field on optical properties of silicate nanocomposite with cadmium sulfide quantum dots was investigated. It was found that the electrostatic field causes quantum dot orientation along the field force lines leading to changes in the polarized components of the luminescence spectrum. The influence of field force line direction on photoinduced absorption characteristics arised from λ = 405.9 nm laser radiation exposure to nanocomposite was shown. © 2017 The Authors.

关键词： Luminescence

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Special Features of Copper(II) Detection in Aqueous Solutions

Special Features of Copper(II) Detection in Aqueous Solution...

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International Conference on Photonics of Nano- and Bio-Structures, PNBS-2015, Russia and the International Conference on Photonics of Nano- and Micro-Structures, PNMS-2015

作者： Sergeev, A.A. Mironenko, A.Y. Leonov, A.A. Nazirov, A.E. Voznesenskiy, S.S. Bratskaya, S.Y. Kulchin, Y.N. Institute of Automation and Control Processes of FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University 8 Sukhanova St. Vladivostok690950 Russia Institute of Chemistry of FEB RAS 159 Prosp. 100-Letiya Vladivostoka Vladivostok690022 Russia

New approach to organize fluorescent sensor system for determination of metal ions in aqueous solutions was presented. The approach is based on modification of hydrophilic polymer with sensitive fluorescent indicators. Possibility to register Cu2+ ions by analyzing of luminescence excitation spectra and lifetimes of the sensitive coating is presented. © 2017 The Authors.

关键词： Metal ions

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Design of a consensus based flocking control of multiple autonomous underwater vehicles using sliding mode approach 28

Design of a consensus based flocking control of multiple aut...

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28th DAAAM International Symposium on Intelligent Manufacturing and automation, DAAAM 2017

作者： Subudhi, Bidyadhar Rayguru, Madan Mohan Filaretov, Vladimir Zuev, Aleksandr Dept. of Electrical Engineering National Institute of Technology Rourkela769008 India Far Esatern Federal University Vladivostok Russia Institute of Automation and Control Processes FEB RAS Vladivostok Russia

ISBN: (纸本)9783902734112

This paper proposes a flocking control algorithm for a team of autonomous underwater vehicles (AUVs) deployed for group motion in a network where only local communication exists among the participating AUVs. The control scheme is proposed with two levels where the inner level utilizes agreement or consensus protocol to derive reference positions for the follower AUVs whereas the outer loop employs a sliding mode controller (SMC) to reduce the tracking error to zero. SMC being a suitable candidate for handling is chosen because of its inherent robustness to any uncertainties and disturbances, it is intended to design a SMC to address the problem of handling uncertainties in the hydrodynamic parameters of the AUV dynamics and has been used to steer each AUV in the flock to their desired states. By exploiting the consensus protocol and SMC, it can be ensured that once an AUV comes into the neighbour zone (maximum range for information exchange for a member AUV outside which no communication is possible) cannot be separated from the group. Therefore, this controller structure is suitable for flocking of multiple AUVs where communication constraints play a vital role in efficient performance of control algorithms. The effectiveness of the proposed controller scheme is demonstrated through MATLAB simulation.

关键词： Autonomous underwater vehicles

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Development of fault accommodation system for actuators of underwater manipulators 28

Development of fault accommodation system for actuators of u...

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28th DAAAM International Symposium on Intelligent Manufacturing and automation, DAAAM 2017

作者： Filaretov, Vladimir Zuev, Alexander Zhirabok, Alexey Konoplin, Alexander Protcenko, Alexander Bidyadhar, Subudhi Institute of Automation and Control Processes FEB RAS Vladivostok Russia Far Eastern Federal University Vladivostok Russia Institute of Marine Technology Problems Vladivostok Russia National Institute of Technology Rourkela769008 India

ISBN: (纸本)9783902734112

The paper presents a fault accommodation system for electric servo actuators of underwater manipulators. These actuators are described by nonlinear equations with variable parameters. It is assumed, that the following typical faults are possible in electric servo actuators: fault caused by changing of viscous friction moment and error in the sensor, which measures the position of output shaft of gear. The proposed system is based on using of diagnostic observers with residual signal feedback. It is proposed the methodology of synthesis of such observers for detection and identification of occurred faults. The accommodation to faults is ensured due to the generation of additional control signals based on identified value of faults. This provides the reliability of underwater working of manipulators at faults. The efficiency of the proposed system is confirmed by mathematical modelling.

关键词： Nonlinear equations

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Sensitivity Analysis of Adaptive Holographic Fiber-Optic Acoustic Emission Sensors during the Registration of Acoustic Waves In a Plate

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IOP Conference Series: Earth and Environmental Science 2020年第6期459卷

作者： O V Bashkov R V Romashko I O Bashkov V I Zaikov H Khon D B Solovev Komsomolsk-on-Amur State University 27 Lenina Av. Komsomolsk-na-Amure 681013 Russia Institute of Automation and Control Processes FEB RAS 5 Radio St. Vladivostok 690041 Russia Far Eastern Federal University 8 Sukhanov St. Vladivostok 690950 Russia Vladivostok Branch of Russian Customs Academy 16 Strelkovaya St. Vladivostok 690034 Russia

Paper presents the results of studying the features of recording acoustic emission waves by fiber-optic sensors. Fiber-optic sensors are used as an elastic medium that receives acoustic emission waves. Optical fibers were built between the layers of the polymer composite material during the manufacturing process. The measuring system is constructed on the basis of an adaptive interferometer. Optical fibers are part of the interferometer optical scheme. The elastic wave acting on an optical fiber changes its optical density, changing the interference pattern of the optical beam. The work of the holographic interferometer based on the fact that the interference pattern, formed by the object and reference light beams, is a dynamic hologram that is constantly recorded in the photorefractive crystal during the elastic action on the fiber. Sensitivity of fiber-optic sensors based on an adaptive interferometer allows recording acoustic emission waves. The acoustic emission waves were generated by the Hsu-Nielsen source. A significant difference in the speed of sound is explained by the anisotropy of the properties of the composite material. The structure and density of the material's fibers in different directions are different. The wavelet transformation was used to form the signal front.

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Metallic nanofilms on single crystal silicon: Growth, properties and applications

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Modern Electronic Materials 2017年第2期3卷 57-65页

作者： Nikolay I. Plusnin Institute of Automation and Control Processes FEB RAS (IACP) 5 Radio Str. Vladivostok 690041 Russia

The metal–silicon thin-film system is not isostructural and furthermore exhibits pronounced interdiffusion and chemical reactions. Therefore the growth of metallic films on silicon leads to a nanosize nonhomogenity of films and a high concentration of defects, especially at interface. The material also contains stressed transition layer, which can contain alloys and/or compounds (silicides). We have considered theoretical viewpoints and reviewed experimental data on the growth and properties of metallic nanofilms (including multilayered ones) on silicon, and also provided a brief review of their applications. The films consist either of atomic-sized, quabquantum sized and quantum sized layers. We have suggested a low temperature film growth technology based on freezing growing layers during deposition by maintaining a low temperature of the substrate and using an atomic beam with a reduced heat power. The technology uses a specially shaped deposition system in which the distance between the source and the substrate is comparable to their size or smaller. Furthermore, we use a special time sequence of deposition that provides for a reduced substrate surface temperature due to greater intervals between deposition pulses. This growth method of atomically thin films and multilayered nanofilms excludes interdiffusion between the layers, reduces three-dimensional growth rate and relatively increases lateral layer growth rate.

关键词： Metal Silicon Silicide film Single crystal substrate Interdiffusion Reaction Growth Molecular beam flow Low temperature growth Growth methods

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Unconventional superconductivity in the single-atom-layer alloy Si(111)−√3×√3−(Tl,Pb)

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Physical Review B 2018年第13期98卷 134505-134505页

作者： T. Nakamura H. Kim S. Ichinokura A. Takayama A. V. Zotov A. A. Saranin Y. Hasegawa S. Hasegawa Department of Physics University of Tokyo Hongo Tokyo 113-0033 Japan The Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan Institute of Automation and Control Processes FEB RAS 690041 Vladivostok Russia and School of Natural Sciences Far Eastern Federal University 690000 Vladivostok Russia

We present results of low-temperature scanning tunneling microscopy/spectroscopy measurements on the one-atom-layer superconductor, Si(111)−√3×√3−(Tl,Pb) which has a spin-split band structure due to the rashba-Bychkov effect. It was revealed that it has a multiple superconducting gap Δ with significant anisotropy and sizable magnitude of 2Δ/kBTC∼8.6(kB is the Boltzmann constant and TC is the critical superconducting temperature). Under the magnetic field, a dip structure was observed even at the core of the vortex. The dip structure was like a “pseudogap” because it remained up to 2 T, well above the upper critical magnetic field determined in the transport measurements (∼0.7 T). This unconventional behavior suggests the possibility of spin-triplet Cooper pairs related to parity-broken superconductors.

关键词： rashba coupling Spin-triplet pairing Superconductivity Surface states Surfaces Scanning probe microscopy Scanning tunneling spectroscopy

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