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Amplitude of the Pulsatile Component of a Photoplethysmographic Waveform as an Optical Marker of Cerebrovascular Reactivity: Experimental Verification in Animal Model

Amplitude of the Pulsatile Component of a Photoplethysmograp...

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Clinical and Translational Biophotonics, Translational 2022

作者： Potapenko, Anastasiia V. Volynsky, Maxim A. Mamontov, Oleg V. Zaytsev, Valery V. Sokolov, Alexey Y. Kamshilin, Alexei A. Department of Neuropharmacology Valdman Institute of Pharmacology Pavlov First Saint Petersburg State Medical University 6-8 Lev Tolstoy str. St. Petersburg197022 Russia Laboratory of Biochemistry Medical Genetic Center 5 Tobol'skaya str. St. Petersburg194044 Russia School of Physics and Engineering ITMO University 49 Kronverksky av. St. Petersburg197101 Russia Laboratory of New Functional Materials for Photonics Institute of Automation & Control Processes The Far East Branch of The Russian Academy of Sciences 5 Radio str. Vladivostok690041 Russia Department of Circulation Physiology Almazov National Medical Research Centre 2 Akkuratov str. St. Petersburg197341 Russia Laboratory of Cortico-Visceral Physiology Pavlov Institute of Physiology The Russian Academy of Sciences 6 Makarov emb. St. Petersburg199034 Russia

Imaging photoplethysmography (PPG) is useful method for monitoring intracranial blood-flow during vasodilatation tests. Our experiments with rats revealed that an increase of PPG pulsatile component is reliable marker... 详细信息

ISBN: (纸本)9781557528209

关键词： Photoplethysmography

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Methods for digital signal processing and digital filter synthesis

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AIP Conference Proceedings 2022年第1期2656卷

作者： O. A. Jumaev D. S. Karpovic M. T. Ismoilov 1Navoi State Mining Institute Department of Automation and Control Automation Faculty Navoi Uzbekistan 2Belarusian State Technological University Department of Automation of Production Processes and Electrical Engineering Chemical Technology and Engineering Faculty Minsk Belarus

Methods of digital signal processing in control and monitoring systems are relevant today and largely replace the classic analog methods. This article discusses the main methods of digital signal processing and synthe...

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On modeling axisymmetric gas flows under heterogeneous combustion in porous media

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AIP Conference Proceedings 2021年第1期2351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

In this work, the problem of axisymmetric gas flows through porous object with heterogeneous combustion sources under natural convection is considered. Heterogeneous combustion is a combustion which occurs when fuel and oxidizer are in different phases. The numerical approach based on combination of explicit and implicit finite-difference schemes is suggested for investigating these processes. It is shown that the location of ignition zone effects on process of propagating the combustion waves. For the axisymmetric case, as well as for the plane case, under natural convection vortex gas flows are observed near the combustion zone. This vortex flows effect on flow of oxidizer into the reaction zone. As in the plane case, the solid combustible component burns out completely, but the direction of the combustion wave propagation in the axisymmetric case can differ from the plane case.

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Giant and tunable excitonic optical anisotropy in single-crystal CsPbX3 halide perovskites

arXiv

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arXiv 2022年

作者： Ermolaev, G.A. Pushkarev, A.P. Zhizhchenko, A.Yu. Kuchmizhak, A.A. Iorsh, I.V. Kruglov, I. Mazitov, A. Ishteev, A. Konstantinova, K. Saranin, D. Slavich, A.S. Stosic, D. Zhukova, E. Tselikov, G. Di Carlo, Aldo Arsenin, Aleksey V. Novoselov, K.S. Makarov, S.V. Volkov, V.S. Xpanceo Dubai Investment Park First Dubai United Arab Emirates ITMO University School of Physics and Engineering St. Petersburg197101 Russia Far Eastern Federal University Vladivostok690091 Russia Institute of Automation and Control Processes Far Eastern Branch Russian Academy of Science Vladivostok690041 Russia Center for Photonics and 2D Materials Moscow Institute of Physics and Technology Dolgoprudny141700 Russia Moscow127055 Russia LASE – Laboratory of Advanced Solar Energy NUST MISiS Moscow119049 Russia N.N. Semenov Federal Research Center for Chemical Physics Russian Academy of Sciences Moscow119991 Russia CHOSE – Centre of Hybrid and Organic Solar Energy Department of Electronics Engineering Rome Italy University of Manchester ManchesterM13 9PL United Kingdom Institute for Functional Intelligent Materials National University of Singapore Singapore Chongqing 2D Materials Institute Chongqing400714 China

During the last years, giant optical anisotropy demonstrated its paramount importance for light manipulation which resulted in numerous applications ranging from subdiffraction light guiding to switchable nanolasers. In spite of recent advances in the field, achieving continuous tunability of optical anisotropy remains an outstanding challenge. Here, we present a solution to the problem through chemical alteration of the ratio of halogen atoms (X = Br or Cl) in single-crystal CsPbX3 halide perovskites. It turns out that the anisotropy originates from an excitonic resonance in the perovskite, which spectral position and strength are determined by the halogens composition. As a result, we manage to continually modify the optical anisotropy by 0.14. We also discover that the halide perovskite can demonstrate optical anisotropy up to 0.6 in the visible range – the largest value among non-van der Waals materials. Moreover, our results reveal that this anisotropy could be in-plane and out-of-plane, depending on perovskite shape – rectangular and square. Hence, it can serve as an additional degree of freedom for anisotropy manipulation. As a practical demonstration, we created perovskite anisotropic nanowaveguides and show a significant impact of anisotropy on high-order guiding modes. These findings pave the way for halide perovskites as a next-generation platform for tunable anisotropic photonics. Copyright © 2022, The Authors. All rights reserved.

关键词： Perovskite

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GPPT: Graph pyramid pooling transformer for visual scene

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Neurocomputing 2025年 647卷

作者： Li, Zhi-Peng Liu, Wen-Jian Sun, Xin Pan, Yi-Jie Gribova, Valeriya Filaretov, Vladimir Fedorovich Cohn, Anthony G. Huang, De-Shuang Ningbo Institute of Digital Twin Eastern Institute of Technology Tongxin Road No. 568 Zhejiang Ningbo315201 China Faculty of Data Science City University of Macau 999078 China MEGAROBO Technologies Linglong Street No. 88 Jiangsu Suzhou215128 China College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Nanjing211106 China Institute of Automation and Control Processes Far Eastern Branch of Russian Academy of Sciences Russia School of Computing University of Leeds LeedsLS2 9JT United Kingdom Institute for Regenerative Medicine Medical Innovation Center and State Key Laboratory of Cardiology Shanghai East Hospital School of Life Sciences and Technology Tongji University Shanghai200123 China

In the field of computer vision, network architectures are critical to the performance of tasks. Vision Graph Neural Network (ViG) has shown remarkable results in handling various vision tasks with their unique characteristics. However, the lack of multi-scale information in ViG limits its expressive capability. To address this challenge, we propose a Graph Pyramid Pooling Transformer (GPPT), which aims to enhance the performance of the model by introducing multi-scale feature learning. The core advantage of GPPT is its ability to effectively capture and fuse feature information at different scales. Specifically, it first generates multi-level pooled graphs using a graph pyramid pooling structure. Next, it encodes features at each scale using a weight-shared Graph Convolutional Neural Network (GCN). Then, it enhances information exchange across scales through a cross-scale feature fusion mechanism. Finally, it captures long-range node dependencies using a transformer module. The experimental results demonstrate that GPPT achieves exceptional performance across various visual scenes, including image classification, and object detection, highlighting its generality and validity. © 2025 Elsevier B.V.

关键词： Convolutional neural networks

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Thermoelectric properties of nanostructured material based on Si and GaSb 4th

Thermoelectric properties of nanostructured material based o...

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4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018

作者： Goroshko, Dmitrii L. Subbotin, Evgeniy Y. Chusovitin, Evgeniy A. Balagan, Semeyon A. Galkin, Konstantin N. Dotsenko, Sergey A. Gutakovskii, Anton K. Khovaylo, Vladimir V. Usenko, Andrey A. Nazarov, Vladimir U. Galkin, Nikolay G. Institute of Automation and Control Processes FEB RAS 5 Radio St. Vladivostok690041 Russia Institute of Semiconductor Physics of SB RAS 13 pr. Lavrentieva Novosibirsk630090 Russia National University of Science and Technology "MISiS" 4 Leninskiy pr. Moscow119049 Russia Academia Sinica Research Center for Applied Sciences 128 Section 2 Academia Road Nangang Taipei11529 Taiwan

ISBN: (纸本)9783035714777

Successively forming GaSb islands by solid-phase epitaxy and covering them with a silicon layer, a nanostructured material containing 4 layers of GaSb nanocrystals (NCs) was grown on Si(111) surface. Due to a small size of the NCs (average height ~ 1.7 nm, average lateral size ~ 14 nm) and, as a consequence, to a significant quantum-size effect, a high electrical conductivity (~ 100 Ω-1·cm-1 at 600 K) together with a low thermal conductivity (~ 1 - 1.5 W·m-1·K-1 at 600 K) was obtained in the nanostructured material Si/NC_GaSb/Si. As a result, the thermoelectric figure of merit of the material has reached 0.82 at 600 K. © 2018 Trans Tech Publications, Switzerland

关键词： Silicon

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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 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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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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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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