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

作者： Tsukanov, Dmitry Anatolyevich Ryzhkova, Maria Valeryevna Institute of Automation and Control Processes FEB RAS Vladivostok690041 Russia Far Eastern Federal University School of Natural Sciences Vladivostok690091 Russia

ISBN: (纸本)9783035737936

Electrical conductance of Si(111)6×6-Tl and Si(111)β√3×√3-Bi surfaces has been monitored in the course of fullerenes deposition. It has been found that dependence of surface conductivity on the adsorbed C60 dose can be understood in terms of charge transfer induced by interaction of fullerene molecules and substrate which can be explained by the acceptor-like behavior of fullerenes. For the Si(111)6×6-Tl surface decreasing of conductance is connected with depletion of metallic bands of the Tl double layer. For the Si(111)β√3×√3-Bi surface the conductivity is almost unchanged with C60 dose, but due to the fact that C60 layer on this surface form close-packed hexagonal arrays in the layer-by-layer mode, it can be used as a template for alkali-induced ultra-thin fulleride formation. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Charge transfer

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Automatic Brightness Correction Method for Side Scan Sonar Echograms

Automatic Brightness Correction Method for Side Scan Sonar E...

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Ocean Studies (ICOS), International Conference on

作者： Alexander Pavin Maxim Khodorenko Institute of Automation and Control Processes Far Eastern Branch of RAS Vladivostok Russian Federation Institute of Marine Technology Problems Far Eastern Branch of RAS Vladivostok Russian Federation

ISBN: (纸本)9781665473736

Side-scan sonar is very important in marine survey such as seafloor exploration, topography, underwater pipeline investigation and so on. SSS-echograms classification and mosaicking are essential during those tasks. Initial side-scan sonar images have uneven brightness distribution. Mosaicking proved difficult due to grayscale gradients on sonar echograms. Brightness equalizing is necessary prior to processing of SSS-echograms. This article discusses methods for brightness equalizing of the echogram images from side-scan sonar in order to identify local inhomogeneities of the seafloor. It provides results of comparative experiments using different approaches to solve this problem. The paper also evaluates the possibility of using these methods on board autonomous underwater robots in real time.

关键词： Autonomous underwater vehicles Shape Brightness Sea floor Pipelines Sonar Surfaces

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Analytical calculation of SPP generation with structured substrates

Analytical calculation of SPP generation with structured sub...

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International Seminar Day on Diffraction

作者： Alexey Proskurin Andrey A. Bogdanov Anton V. Dyshlyuk Oleg B. Vitrik School of Physics and Engineering ITMO University St. Petersburg Russia Qingdao Innovation and Development Base of Harbin Engineering University Qingdao China Institute of Automation and Control Processes (IACP) FEB RAS Far Eastern Federal University (FEFU) Vladivostok Russia Vladivostok State University Vladivostok Russia

Unusual optical properties of structured metal surfaces arise from plasmon resonances and interactions through surface plasmon-polariton waves (SPPs). Predicting these properties is generally challenging. However, simplifying the problem using harmonic Fourier components allows one to decompose the initial problem down to the problem of SPP generation by the finite-length sinusoidal grating. In this work, we propose an analytical method for the description of SPP generation with such gratings by utilising methods from the waveguide theory based on the Lorentz reciprocity theorem.

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Algorithms of the AUV control system for operation under the lower ice edge

Algorithms of the AUV control system for operation under the...

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Ocean Studies (ICOS), International Conference on

作者： Alexander Inzartsev Andrey Bagnitckii Mikhail Panin Institute of Automation and Control Processes Far Eastern Branch of RAS Vladivostok Russian Federation Institute of Marine Technology Problems Far Eastern Branch of RAS Vladivostok Russian Federation

ISBN: (纸本)9781665473736

One of the urgent tasks for autonomous underwater vehicles (AUV) is monitoring of marine biological resources and survey of the lower edge of the ice in the circumpolar zones. The main problems for AUV movement during such work are the uneven lower surface of the ice and the need to search for an ice hole for surfacing, which may be required either in accordance with the mission program or in an emergency situation. The report discusses the algorithms of the AUV information and control system, designed to solve these problems. These algorithms ensure the movement of the AUV under the ice at various horizons, with the stabilization of a given distance from the lower edge of the ice, as well as in ice-covered shallow waters. To obtain information about the ice situation, an echolocation system is used in AUV, including several sonars with fixed directional patterns in the front hemisphere of the vehicle. The correctness of the algorithms was investigated using mathematical modeling methods.

关键词： Solid modeling Three-dimensional displays Oceans Sonar control systems Search problems Ice

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Electrochemically Deposited Germanium Nanowires: Structure and Resistivity Against High-Temperature Oxidation

SSRN

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SSRN 2023年

作者： Goroshko, D.L. Gavrilin, Ilya M. Chusovitina, S.V. Dronov, Alexey A. Volkov, R.L. Gerasimenko, Andrey V. Borgardt, N.I. Gavrilov, Sergey A. Institute of Automation and Control Processes Far Eastern Branch of the RAS Vladivostok Russia National Research University of Electronic Technology Moscow Russia Institute of Chemistry 159 prospekt 100-letiya Vladivostoka Vladivostok690022 Russia

Using photoluminescence and Raman spectroscopy, as well as high-resolution transmission microscopy and X-ray diffraction, germanium nanowires obtained by cathodic deposition from an aqueous solution of germanium dioxide were studied during their annealing by a laser at 720 °C under ambient conditions. It is established that the dynamics of Raman and photoluminescence spectra are related to the oxidation of wires during such annealing. The study showed that vacuum annealing of as-grown nanowires at 600 °C for 30 min suppresses laser high-temperature germanium oxidation. The observed effect is associated with the saturation of vacancies in the surface germanium suboxide with indium atoms used as a catalyst in the formation of nanowires. © 2023, The Authors. All rights reserved.

关键词： Passivation

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System for Identifying Target Objects to Perform Manipulative Operations by Unmanned Underwater Vehicles

System for Identifying Target Objects to Perform Manipulativ...

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Ocean Studies (ICOS), International Conference on

作者： Alexander Konoplin Alexander Yurmanov Nikita Krasavin Pavel Piatavin Maxim Panchuk Roman Vasilenko Institute of Marine Technology Problems Far Eastern Branch of RAS Institute of Automation and Control Processes Far Eastern Branch of RAS Vladivostok Russia Institute of Marine Technology Problems Far Eastern Branch of RAS Vladivostok Russia

ISBN: (纸本)9781665473736

The paper proposes a system for identifying target objects to perform manipulative operations by unmanned underwater vehicles (UUV) equipped with multi-link manipulators (MM). This system processes point clouds received from technical vision systems (TVS) mounted on UUV, and provides high-precision identification of the location and shape of target objects relative to the UUV. Then, the specified trajectories of the MM working tool are translated on the determined surface of the target object, taking into account the possible silting, fouling and deformation of this object. The developed system is implemented in the C++ programming language on the NVIDIA Jetson TX2 on-board computer. The results of recognition of underwater objects using a Zed2 stereo camera placed in a sealed box, calibrated in an aquatic environment using the OpenCV library method, are presented. The experimental data obtained were used to simulate the process of manipulation operation performed by the manipulator of the UUV in the software packages CoppeliaSim and Matlab/Simulink. The research results confirmed the operability and high efficiency of the proposed system.

关键词： Point cloud compression Autonomous underwater vehicles TV Manipulators Cameras Trajectory Object recognition

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Unveiling the stacking-dependent electronic properties of 2D ultrathin rare-earth metalloxenes family LnX2 (Ln = Eu, Gd, Dy;X = Ge, Si)

arXiv

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arXiv 2024年

作者： Sheverdyaeva, Polina M. Mihalyuk, Alexey N. Chou, Jyh-Pin Matetskiy, Andrey V. Eremeev, Sergey V. Zotov, Andrey V. Saranin, Alexander A. Istituto di Struttura della Materia Consiglio Nazionale delle Ricerche TriesteI-34149 Italy Institute of High Technologies and Advanced Materials Far Eastern Federal University Vladivostok690950 Russia Institute of Automation and Control Processes FEB RAS Vladivostok690041 Russia Department of Physics National Changhua University of Education No.1 Jinde Rd. Changhua County Changhua50007 Taiwan Institute of Strength Physics and Materials Science SB RAS Tomsk634055 Russia

The studies of electronic effects in reduced dimensionality have become a frontier in nanoscience due to exotic and highly tunable character of quantum phenomena. Recently, a new class of 2D ultrathin LnX2 metalloxenes composed of a triangular lattice of lanthanide ions (Ln) coupled with 2D-Xenes of silicene or germanene (X2) was introduced and studied with a particular focus on magnetic and transport properties. However, the electronic properties of metalloxenes and their effective functionalization remain mainly unexplored. Here, using a number of experimental and theoretical techniques, we trace the evolution of electronic properties and magnetic ground state of metalloxenes triggered by external perturbations. We demonstrate that the band structure of LnX2 films can be uniquely modified by controlling the Xenes stacking, thickness, varying the rare-earth and host elements, and applying an external electric field. Our findings suggest new pathways to manipulate the electronic properties of 2D rare-earth magnets that can be adjusted for spintronics applications. Copyright © 2024, The Authors. All rights reserved.

关键词： Electronic properties

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Mg 2 Si is the new black: introducing a black silicide with > 95% average absorption at 200-1800 nm wavelengths

arXiv

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arXiv 2022年

作者： Shevlyagin, Alexander Il’yaschenko, Vladimir Kuchmizhak, Aleksandr Mitsai, Eugeny Sergeev, Alexander Gerasimenko, Andrey Gutakovskii, Anton Institute of Automation and Control Processes Far Eastern Branch Russian Academy of Science Vladivostok690041 Russia Pacific Quantum Center Far Eastern Federal University 8 Sukhanova Str. Vladivostok Russia Institute of Chemistry FEB RAS Vladivostok690022 Russia Institute of Semiconductor Physics of SB RAS Novosibirsk630090 Russia

Textured silicon surface structures, in particular black silicon (b-Si), open up possibilities for Si-based solar cells and photodetectors to be extremely thin and highly sensitive owing to perfect light-trapping and anti-reflection properties. However, near-infrared (NIR) performance of bare b-Si is limited by Si band gap of 1.12 eV or 1100 nm. This work reports a simple method to increase NIR absorption of b-Si by in vacuo silicidation with magnesium. Obtained Mg 2 Si/b-Si heterostructure has a complex geometry where b-Si nanocones are covered by Mg 2 Si shells and crowned with flake-like Mg 2 Si hexagons. Mg 2 Si formation atop b-Si resulted in 5-fold lower reflectivity and optical absorption to be no lower than 88% over 200-1800 nm spectral range. More importantly, Mg 2 Si/b-Si heterostructure is more adjusted to match AM-1.5 solar spectrum with theoretically higher photogenerated current density. The maximal advantage is demonstrated in the NIR region compared to bare b-Si in full accordance with one‘s expectations about NIR sensitive narrow band gap (∼ 0.75 eV) semiconductor with high absorption coefficient, which is Mg 2 Si. Results of optical simulation confirmed the superiority of Mg 2 Si/b-Si NIR performance. Therefore, this new wide-band optical absorber called black silicide proved rather competitive alongside state-of-the-art approaches to extend b-Si spectral blackness. Copyright © 2022, The Authors. All rights reserved.

关键词： Infrared devices

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Numerical Analysis of Thermal Performance of Breathing Air Cooler Based on Granular Phase Change Material

SSRN

引用

SSRN 2023年

作者： Fetsov, Sergey S. Lutsenko, Nickolay A. Institute of Automation and Control Processes Far Eastern Branch RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University 8 Sukhanova St. Vladivostok690950 Russia

In this paper, granular phase change material (PCM) is proposed to be used as a heat accumulating material in a thermal protective respirator also called a heat exchanger for breathing air cooling. The problem of creating a thermal protective respirator is urgent because thermal inhalation injuries, which are caused by breathing very hot air, have a significant impact on the harm and mortality of people in indoor fires. Numerical experiments have shown the ability of the commercially available granular PCM in the respirator to cool hot air for breathing during the time required for the human evacuation: mass of 130 g is enough to cool the air down to a temperature of less than 50°C within 10 minutes. A parametric study of the performance of such air cooler is carried out: effect of PCM melting temperature, time variation of the outlet air flow rate and partial closure of the outlet from the cooling element is analyzed. It is shown that an increase in the PCM melting temperature while keeping the other parameters unchanged worsens the cooling efficiency of the heat exchanger. The time variations of the outlet air flow rate that simulates the human breathing can considerably affect the output characteristics of the respirator. The partial closure of the outlet from the cooling element leads to an increase in the maximum temperature of the inhaled air. © 2023, The Authors. All rights reserved.

关键词： Packed beds

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Relationship between the photoluminescence spectra and ir spectroscopy of mesoporous silicon samples during long-term storage: The effect of immersion in an aqueous fe(no3)3 solutions 5th

Relationship between the photoluminescence spectra and ir sp...

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

作者： Galkin, Nikolay Yan, Dmitrii Galkin, Konstantin Chusovotina, Svetalana Institute of Automation and Control Processes FEB RAS 5 Radio Street Vladivostok690041 Russia Far Eastern State Transport University 47 Serysheva Str Khabarovsk680021 Russia

ISBN: (纸本)9783035737936

The article provides a comparative analysis of changes in the PL spectra and infrared spectroscopy (IR) with reference and immersion samples of mesoporous silicon during long-term storage in air at room temperature. Immersion was carried out in an aqueous solution of iron nitrate (Fe(NO3)3) with a concentration of 0.2 M and 0.5 M with three times: 5, 10 and 20 minutes. An analysis of the FIR data for etalon and immersion samples showed a number of features found during long-term storage of mesoporous silicon: (1) a sharp decrease in the density of hydride bonds;(2) the polynomial nature of the growth of O3-SiH and Si-OH bonds saturating dangling bonds;and (3) the polynomial growth of silicon dioxide with the formation of oxygen defects. It was found that after immersion in a solution of 0.5 M Fe (NO3)3 for 10 minutes, a more intense increase in the PL in mesoporous silicon is observed while maintaining its nanostructure after 200 days of storage compared with the etalon sample, for which a weak quantum size confinement (QSC) is observed. The main mechanism of photoluminescence increase in mesoporous silicon during long-term storage is radiative recombination from oxygen defect levels, not from a QSC effect. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Infrared spectroscopy

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