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arXiv 2022年

作者： Shashank, Utkarsh Deka, Angshuman Fukuma, Yasuhiro Ye, Chen Wang, X. Renshaw Gupta, Surbhi Rawat, Rajdeep Singh Medwal, Rohit Asada, Hironori Department of Physics and Information Technology Faculty of Computer Science and System Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka820-8502 Japan Birck Nanotechnology Center School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Research Center for Neuromorphic AI hardware Kyushu Institute of Technology Kitakyushu808-0196 Japan School of Physical and Mathematical Sciences Nanyang Technological University 637616 Singapore School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore Natural Science and Science Education National Institute of Education Nanyang Technological University 637616 Singapore Department of Physics Indian Institute of Technology Kanpur Kanpur208016 India Graduate School of Sciences and Technology for Innovation Yamaguchi University 2-16-1 Tokiwadai Ube755-8611 Japan

Interfacial two-dimensional electron gas (2DEG), especially the SrTiO3-based ones at the unexpected interface of insulators, have emerged to be a promising candidate for efficient charge-spin current interconversion. In this article, to gain insight into the mechanism of the charge-spin current interconversion at the oxide-based 2DEG, we focused on conducting interfaces between insulating SrTiO3 and two types of aluminium-based amorphous insulators, namely SrTiO3/AlN and SrTiO3/Al2O3, and estimated their charge-spin conversion efficiency, θcs. The two types of amorphous insulators were selected to explicitly probe the overlooked contribution of oxygen vacancy to the θcs. We proposed a mechanism to explain results of spin-torque ferromagnetic resonance (ST-FMR) measurements and developed an analysis protocol to reliably estimate the θcs of the oxide based 2DEG. The resultant θcs/t, where t is the thickness of the 2DEG, were estimated to be 0.244 nm-1 and 0.101 nm-1 for the SrTiO3/AlN and SrTiO3/Al2O3, respectively, and they are strikingly comparable to their crystalline counterparts. Furthermore, we also observe a large direct current modulation of resonance linewidth in SrTiO3/AlN samples, confirming its high θcs and attesting an oxygen-vacancy-enabled charge-spin conversion. Our findings emphasize the defects' contribution to the charge-spin interconversion, especially in the oxide-based low dimensional systems, and provide a way to create and enhance charge-spin interconversion via defect engineering. Copyright © 2022, The Authors. All rights reserved.

关键词： Aluminum compounds

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Terahertz wireless communication at 560-GHz band using Kerr micro-resonator soliton comb

arXiv

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arXiv 2023年

作者： Tokizane, Yu Okada, Shota Nishimoto, Kenji Okamura, Yasuhiro Kishikawa, Hiroki Hase, Eiji Fujikata, Jun-Ichi Haraguchi, Masanobu Kanno, Atsushi Hisatake, Shintaro Kuse, Naoya Yasui, Takeshi Tokushima University 2-1 Minami-Josanjima Tokushima770-8506 Japan Graduate School of Sciences and Technology for Innovation Tokushima University 2-1 Minami-Josanjima Tokushima770-8506 Japan Graduate School of Technology Industrial and Social Sciences Tokushima University 2-1 Minami-Josanjima Tokushima770-8506 Japan National Institute of Information and Communications Technology 4-2-1 Nukuikitamachi Koganei Tokyo184-8795 Japan Department of Electrical and Mechanical Engineering Nagoya Institute of Technology Gokiso-cho Showa-ku Aichi Nagoya466-8555 Japan Electrical and Energy System Engineering Division Gifu University 1-1 Yanagido Gifu501-1193 Japan PRESTO Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi Saitama332-0012 Japan

Terahertz (THz) waves have attracted attention as carrier waves for next-generation wireless communications (6G). Electronic THz emitters are widely used in current mobile communications;however, they may face technical limitations in 6G with upper-frequency limits. We demonstrate wireless communication in a 560-GHz band by using a photonic THz emitter based on photomixing of a 560-GHz-spacing soliton microcomb in a uni-travelling carrier photodiode together with a THz receiver of Schottky barrier diode. The on-off keying data transfer with 2-Gbit/s achieves a Q-factor of 3.4, thus, satisfying the limit of forward error correction. © 2023, CC BY.

关键词： Schottky barrier diodes

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Application of IoT and Artificial Neural Networks (ANN) for Monitoring of Underground Coal Mines

Application of IoT and Artificial Neural Networks (ANN) for ...

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International Conference on information science and Communication Technology (ICISCT)

作者： Arif Hussain Soomro Muhammad Taha Jilani Management Information System department Karachi Institute of Economics & Technology Karachi Pakistan Graduate School of Science and Engineering Karachi Institute of Economics & Technology Karachi Pakistan

ISBN: (数字)9781728168999

ISBN: (纸本)9781728169002

Explosions in coal mines during the work time is a one of major cause of casualties in the coal mines. Thus possess a life threaten situation for coal miners. In this paper we propose a system in which sensors sense concentration of gases (Methane and carbon monoxide) in the air, measures the mine temperature and humidity and heartbeat of miner. In response it generate the alerts, and identifies the location of miners. We propose ZigBee based wireless sensor network (WSN) for communication between sensors and coal mine safety monitoring system. The iBeacons are proposed for identification of miners. A service oriented architecture (SOA) has used to develop the system. The main purpose of this research paper is to ensure miners safety, by predicting the methane has with artificial neural network (ANN). The application of ANN seems more viable than others, the calculated values shows that its prove a negligible relative error that is around 0.05.. than the actual measurements. The proposed work is then compared with the state-of-the-art methods that overcomes the limitations form the existing systems.

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Halogen conversion-intercalation chemistry promises high energy density Li-ion battery

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science Bulletin 2019年第19期64卷 1393-1395页

作者： Huijun Yang Haoshen Zhou National Laboratory of Solid State Microstructures&Department of Energy Science and Engineering Nanjing UniversityNanjing210093China Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba305-8568Japan Graduate School of System and Information Engineering University of TsukubaTsukuba305-8573Japan

The state-of-art lithium-ion batteries(LIBs)have achieved great commercial success during the past *** intercalation mechanisms in graphite anode and lithium transition metal oxide enabled its long-term stability in organic *** classic electrolyte formula of lithium hexafluorophosphate(Li PF6)in carbonate solvents provided a benign solid electrolyte interphase(SEI)on the electrode *** researches on materials and electrolytes have improved the electrochemical stability and energy density for ***,their adoptions,especially in electric vehicles and power grid have been obstructed owing to the safety concerns and environmental *** flammable carbonate solvents are easy to trigger fire and cause cell *** common used LiPF6 is sensitive to moisture which increases much difficulty to eliminate trace water in practical application.

关键词： Li Halogen conversion-intercalation high energy density

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Evaluation of Five Atmospheric Correction Algorithms for Multispectral Remote Sensing Data Over Plateau Lakes

SSRN

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SSRN 2023年

作者： Wang, Dong Tang, Bo-Hui Li, Zhao-Liang Faculty of Land Resources Engineering Kunming University of Science and Technology Kunming650093 China Key Laboratory of Plateau Remote Sensing Department of Education of Yunnan Province Kunming China Southwest United Graduate School Kunming China State Key Lab of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China Key Laboratory of Agricultural Remote Sensing Ministry of Agriculture and Rural Affairs Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing100081 China

Comparing algorithms in remote sensing image processing and assessing their accuracy and suitability for water atmospheric correction (AC) are essential steps for acquiring inland water color remote sensing (WCRS) data. Data acquired from Sentinel-2 Multi Spectral Imager (MSI) and Sentinel-3 Ocean and Land Color Instrument (OLCI) sensors were used to compare the effects of five algorithms: the Acolite, the Case 2 Regional Coast Color (C2RCC), the Fast Line-of-sight Atmospheric Analysis of Hypercubes (FLAASH), the Image correction for atmospheric effects (iCOR), and the Level 2 generator (L2gen), across different spectral bands. In-situ measurements at Erhai Lake in the Plateau Lakes (PL) validate that the Acolite algorithm excels in the red band of MSI sensor, while C2RCC algorithm differs notably in blue and green bands. FLAASH approximates measured spectrum better at green band's peak, but iCOR is affected by higher resolution images, causing over-correction on lower spatial resolution OLCI sensors. L2gen yields concentrated data amplitude in correction results. When applied to MSI sensors, the five AC algorithms yield average relative errors of 26.20%, 26.87%, 28.35%, 33.52%, and 37.36% respectively. For OLCI sensors, the corresponding errors are 22.09%, 31.57%, 36.77%, 37.35%, and 38.27%. These findings are crucial for selecting appropriate correction methods, enhancing the accuracy of remote sensing in PL, especially in water monitoring and environmental research. They also aid in establishing quantitative relationships between varying spatial resolutions in remote sensing images. © 2023, The Authors. All rights reserved.

关键词： Lakes

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Comparison of Isometric Force Estimation Methods for Upper Limb Elbow Joints

Comparison of Isometric Force Estimation Methods for Upper L...

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IEEE International Conference on Mechatronics and Automation

作者： Ziyi Yang Shuxiang Guo Yi Liu Graduate School of Engineering Engineering Kagawa University Hayashi-cho Takamatsu Japan Key Laboratory of Convergence Medical Engineering System and Healthcare Technology The Ministry of Industry and Information Technology School of Life Science Beijing Institute of Technology Haidian District Beijing China

ISBN: (数字)9781728164168

ISBN: (纸本)9781728164175

For post-stroke patient, the interaction force between the impaired limb and the rehabilitation robotic system is an important issue for patient safety in clinical treatment. The surface electromyographic signals is generated from the center nervous system which can present the muscle activity for predicting the muscle force without force/torque sensors. For predicting the isometric joint force, there are two kinds of methods, the model-based approach and the model-free approach. In the model-based method, a musculoskeletal model would be usually used for calculating the individual muscle force. The interaction force would be calculated by a bio-mechanical model based on the individual muscle force. Conversely, the model-free would establish an approximate model by directly mapping the relationship between the force data and the sEMG signals. The purpose of this paper is to compare these two kinds of prediction method for interaction force between human and contacting environment by the sEMG signals. In this study, the isometric elbow joint extension motions are focused. Two muscles of the upper limb were selected to record EMG signals. The Hill-type musculoskeletal model was employed as the model-based approach and the neural network was selected as the model-free approach. The experimental results show that the model-free method have the better prediction performance which can provide acceptable prediction results with root-mean-square error (RMSE) error below 2.20 N.

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Investigate of correlation between mango color and sugar content : Classification system by image analysis 4

Investigate of correlation between mango color and sugar con...

引用

4th International Conference on Intelligent Informatics and Biomedical sciences, ICIIBMS 2019

作者： Shiroma, Yasushi Nagayama, Itaru Afuso, Hitoshi Tamaki, Shiro University of the Ryukyus Graduate School of Science and Engineering Nishihara Okinawa Japan University of the Ryukyus Information Technology Intelligent System Nishihara Okinawa Japan University of the Ryukyus Civil Engineering and Architecture Nishihara Okinawa Japan

ISBN: (纸本)9781728133805

Mango's grade is determined by its color and sugar content. However currently it is done by human visually. Visual inspection of grade of mango is human power consuming operation. To this end, the system to classify mangoes by their images has been developed. Traditional system is based on the color histograms of mangoes and thresholding their feature. However traditional research did not validate the assumption that there is correlation between mango's color, And its sugar content and the assumption is essential for image-based classification approach. To this end, authors showed the evidence that there is some correlation between mango's color and its sugar content. © 2019 IEEE.

关键词： Color

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A first-principles study on the quantum tunneling of methylhydroxycarbene isomerization in various solvents 4

A first-principles study on the quantum tunneling of methylh...

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4th Padjadjaran International Physics Symposium 2019, PIPS 2019

作者： Susanti, E.D. Rusydi, F. Puspitasari, I. Fadilla, R.N. Aisyah, N.D. Ahmad, A. Research Center for Quantum Engineering Design Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Precision Sciences and Technology and Applied Physics Graduate School of Engineering Osaka University Suita565-0871 Japan Information System Study Program Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia School of Chemical Science and Food Technology Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor43600 Malaysia

Quantum tunneling phenomenon allows a high-barrier reaction to occur even though thermal energy is not sufficient to surmount the barrier. The phenomenon has been suggested to exist in the isomerization of methylhydroxycarbene which occured at 11 K. Here we study the quantum tunneling that occured in the isomerization of methylhydroxycarbene to acetaldehyde and to vinyl alcohol based on density functional calculations. The isomerization pathways are determined under the effect of various solvents which are modeled by polarizable continuum model (PCM). We use Wentzel-Kramers-Brillouin (WKB) approximation to calculate the tunneling probability (T) and extend the usefulness of T into isomerization rate. The results show that the solvents give a significant effect on the isomerization rate of methylhydroxycarbene to acetaldehyde but an insignificant one on the isomerization rate to vinyl alcohol. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Isomerization

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Deep learning assessment of disproportionately enlarged subarachnoid-space hydrocephalus in Hakim’s disease or idiopathic normal pressure hydrocephalus

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Radiology Advances 2024年第3期1卷

作者： Yamada, Shigeki Ito, Hirotaka Iseki, Chifumi Kondo, Toshiyuki Yamanaka, Tomoyasu Tanikawa, Motoki Otani, Tomohiro Ii, Satoshi Ohta, Yasuyuki Watanabe, Yoshiyuki Wada, Shigeo Oshima, Marie Mase, Mitsuhito Department of Neurosurgery Nagoya City University Graduate School of Medical Science Nagoya Aichi 467-8601 Japan Interfaculty Initiative in Information Studies/Institute of Industrial Science The University of Tokyo Tokyo 113-8654 Japan Medical System Research & Development Center FUJIFILM Corporation Tokyo 107-0052 Japan Department of Behavioral Neurology and Cognitive Neuroscience Tohoku University Graduate School of Medicine Sendai Miyagi 980-8575 Japan Division of Neurology and Clinical Neuroscience Department of Internal Medicine III Yamagata University School of Medicine Yamagata Yamagata 990-2331 Japan Department of Mechanical Science and Bioengineering Graduate School of Engineering Science Osaka University Toyonaka Osaka 560-8531 Japan Department of Mechanical Engineering School of Engineering Institute of Science Tokyo Tokyo 152-8550 Japan Department of Radiology Shiga University of Medical Science Otsu Shiga 520-2192 Japan

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Hysterisial variable-threshold MOS gates

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, information and systems 2019年第9期139卷 958-963页

作者： Nagata, Yasunori Kawaguchi, Mayuka F. Yamada, Chikatosi Miyagi, Takeshi Electronics Information and Communication Engineering Course University of the Ryukyus 1 Senbaru Nishihara Okinawa903-0213 Japan Graduate School of Information Science and Technology Hokkaido University Kita 14 Nishi 9 Kita-ku Sapporo060-0814 Japan Okinawa National College of Technology 905 Henoko Nago Okinawa905-2192 Japan

Asynchronous circuits are a technique in order to solve the some serious synchronous circuits' problems such as clock skew, power consumption and electromagnetic noise. In this paper, we designed histerisial variable-threshold gates based on neuron MOS transistors for asynchronous circuits. The proposed hysteresial variable-threshold gates are also expected usuful for neural networks or machine larning for the hysteresis, that is memory, characteristics. The developed gates having variable-threshold operations can be used to set a threshold of a neuron. The simulation results of hysteresial variable-threshold gates are provided with SPICE simulator. The synthesized hysterisial variable-threshold gates has three gate-inputs and two control wires. Then asynchronous half-adder is demonstrated as an arithmetic circuit example. © 2019 The Institute of Electrical Engineers of Japan.

关键词： Hysteresis

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