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超导磁悬浮列车推进线圈局部放电的绝缘诊断

国外铁道车辆 2021年第3期58卷 10-15页

作者： ryohei ikeda Satoru OTA Masayuki AIBA [日]Hiroshi YODA 周方涵(译) 栾平景(校) 不详

当磁悬浮列车运行时,推进线圈应用高电压。为检测预报推进线圈绝缘故障的局部放电设计了绝缘诊断方法。介绍了评定绝缘性能用的局部放电试样的研制及对局部放电中的电磁波传播的检查。

关键词：超导磁悬浮列车推进线圈绝缘诊断局部放电日本

Symmetric silicon microring resonator optical crossbar array for accelerated inference and training in deep learning

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Photonics Research 2024年第8期12卷 1681-1688页

作者： RUI TANG SHUHEI OHNO KEN TANIZAWA KAZUHIRO ikeda MAKOTO OKANO KASIDIT TOPRASERTPONG SHINICHI TAKAGI MITSURU TAKENAKA Department of Electrical Engineering and Information Systems The University of TokyoTokyo 113-8656Japan Quantum ICT Research Institute Tamagawa UniversityTokyo 194-8610Japan National Institute of Advanced Industrial Science and Technology Ibaraki 305-8568Japan

Photonic integrated circuits are emerging as a promising platform for accelerating matrix multiplications in deep learning,leveraging the inherent parallel nature of *** various schemes have been proposed and demonstrated to realize such photonic matrix accelerators,the in situ training of artificial neural networks using photonic accelerators remains challenging due to the difficulty of direct on-chip backpropagation on a photonic *** this work,we propose a silicon microring resonator(MRR)optical crossbar array with a symmetric structure that allows for simple on-chip backpropagation,potentially enabling the acceleration of both the inference and training phases of deep *** demonstrate a 4×4 circuit on a Si-on-insulator platform and use it to perform inference tasks of a simple neural network for classifying iris flowers,achieving a classification accuracy of 93.3%.Subsequently,we train the neural network using simulated on-chip backpropagation and achieve an accuracy of 91.1%in the same inference task after ***,we simulate a convolutional neural network for handwritten digit recognition,using a 9×9 MRR crossbar array to perform the convolution *** work contributes to the realization of compact and energy-efficient photonic accelerators for deep learning.

关键词： resonator neural matrix

Achievable hole concentration at room temperature as a function of Mg concentration for MOCVD-grown p-GaN after sufficient annealing

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Journal of Semiconductors 2024年第8期45卷 67-73页

作者： Siyi Huang Masao ikeda Feng Zhang Minglong Zhang Jianjun Zhu Shuming Zhang Jianping Liu School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China Key Laboratory of Nanodevices and Applications Chinese Academy of SciencesSuzhou 215123China

Relationship between the hole concentration at room temperature and the Mg doping concentration in p-GaN grown by MOCVD after sufficient annealing was studied in this *** annealing conditions were applied to obtain sufficient activation for p-GaN samples with different Mg doping *** concentration,resistivity and mobility were characterized by room-temperature Hall *** Mg doping concentration and the residual impurities such as H,C,O and Si were measured by secondary ion mass spectroscopy,confirming negligible compensations by the *** hole concentration,resistivity and mobility data are presented as a function of Mg concentration,and are compared with literature *** appropriate curve relating the Mg doping concentration to the hole concentration is derived using a charge neutrality equation and the ionized-acceptor-density[N-(A)^(-)](cm^(−3))dependent ionization energy of Mg acceptor was determined asE_(A)^(Mg)=184−2.66×10^(−5)×[N_(A)^(-)]1/3 meV.

关键词： p-GaN hole concentration electrical properties annealing ionization energy

Exploring the effect of cooling rate on non-isothermal crystallization of copolymer polypropylene by fast scanning calorimetry

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China Foundry 2024年第4期21卷 379-386页

作者： Yang Liao Ye-yuan Hu Kosuke ikeda Ryoji Okabe Rui-fen Wu Ryota Ozaki Qing-yan Xu Key Laboratory for Advanced Materials Processing Technology School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Composite Laboratory Research&Innovation Center Mitsubishi Heavy Industries Ltd.Nagasaki 8510392Japan

Polypropylene is commonly used as a binder for ceramic injection molding,and rapid cooling is often encountered during ***,the crystallization behavior of polypropylene shows a strong dependence on cooling rate due to its semi-crystalline ***,the influence of cooling rate on the quality of final product cannot be *** this study,the fast differential scanning calorimetry(FSC)test was performed to study the influence of cooling rate on the non-isothermal crystallization behavior and non-isothermal crystallization kinetics of a copolymer polypropylene(PP BC03B).The results show that the crystallization temperatures and crystallinity decrease as the cooling rate *** addition,two exothermic peaks occur when cooling rate ranges from 30 to 300 K·s^(-1),indicating the formation of another crystal ***,Ozawa and Mo equations were used to explore the non-isothermal crystallization kinetics,and it can be concluded that the Mo method is suitable for this study.

关键词： cooling rate crystallization temperature crystallinity non-isothermal crystallization kinetics FSC copolymer polypropylene

Automatic registration of MLS point clouds and SfM meshes of urban area

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Geo-Spatial Information Science 2016年第3期19卷 171-181页

作者： Reiji Yoshimura Hiroaki Date Satoshi Kanai ryohei Honma Kazuo Oda Tatsuya ikeda Graduate School of Information Science and Technology Hokkaido UniversitySapporoJapan Asia Air Survey Co. LtdKawasakiJapan

Recent advances in 3D scanning technologies allow us to acquire accurate and dense 3D scan data of large-scale environments ***,there are various methods for acquiring largescale 3D scan data,such as Mobile Laser Scanning(MLS),Airborne Laser Scanning,Terrestrial Laser Scanning,photogrammetry and Structure from Motion(SfM).Especially,MLS is useful to acquire dense point clouds of road and road-side objects,and SfM is a powerful technique to reconstruct meshes with textures from a set of digital *** this research,a registration method of point clouds from vehicle-based MLS(MLS point cloud),and textured meshes from the SfM of aerial photographs(SfM mesh),is proposed for creating high-quality surface models of urban areas by combining *** general,SfM mesh has non-scale information;therefore,scale,position,and orientation of the SfM mesh are adjusted in the registration *** our method,first,2D feature points are extracted from both SfM mesh and MLS point *** process consists of ground-and building-plane extraction by region growing,random sample consensus and least square method,vertical edge extraction by detecting intersections between the planes,and feature point extraction by intersection tests between the ground plane and the ***,the corresponding feature points between the MLS point cloud and the SfM mesh are searched efficiently,using similarity invariant features and ***,the coordinate transformation is applied to the SfM mesh so that the ground planes and corresponding feature points are ***,scaling Iterative Closest Point algorithm is applied for accurate *** results for three data-sets show that our method is effective for the registration of SfM mesh and MLS point cloud of urban areas including buildings.

关键词： Registration MLS point clouds SfM mesh urban area hash similarity invariant feature

Study of the Effect of Acetic Acid and Phosphate on Copper Corrosion by Immersion Tests

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Materials Sciences and Applications 2024年第1期15卷 15-23页

作者： Yuna Yamaguchi Kaho Sugiura Toyohiro Arima Fuka Takahashi Itaru ikeda Yutaka Yamada Osamu Sakurada Department of Chemistry and Biomolecular Science Faculty of Engineering Gifu University Gifu Japan Dai-Dan Co. Ltd. Saitama Japan Daiwa Techno Co. Ltd. Gifu Japan

It was reported that hemispheric corrosion occurred in copper tubes in an acetic acid environment. When hemispheric corrosion occurred, corrosion could easily progress if water then flowed into the copper pipe, and countermeasures were needed. Therefore, we studied the copper corrosion caused by acetic acid. The present work investigated the relationship between the corrosion form of copper and acetic acid concentration using phosphorous-deoxidized copper, and reported that hemispherical corrosion was observed at acetic acid concentrations of 0.01 to 1 vol.% (0.002 to 0.2 mol·L-1) in the immersion test. In this study, the effects of acetic acid and phosphate on copper corrosion were examined using oxygen-free copper in immersion tests. The results suggested that different concentrations of phosphate in acetic acid solutions and the presence or absence of acetic acid and phosphate affected the corrosion of copper, resulting in different corrosion forms and corrosion progress.

关键词： Acetic Acid Phosphate Oxygen-Free Copper Hemispherical Corrosion Ant-Nest Corrosion

SPERA Hydrogen System^(TM)by LOHC-MCH Method for Massive Hydrogen Storage and Transportation

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Journal of Environmental Science and Engineering(A) 2024年第2期13卷 50-60页

作者： Yoshimi Okada Kaji Naohiro Osamu ikeda Kenichi Imagawa Hironori Kawai Masashi Nagai Yasuhiro Inoue Frontier Business Division Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan Hydrogen Business Department Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan R&D Center Chiyoda Corporation3-13 Moriya-cho Kanagawa-kuYokohama 2208765Japan Technology Development Department Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan

Expanding the hydrogen energy utilization is essential for decarbonization,and the commercialization of hydrogen energy carrier systems that can“store”and“transport”hydrogen in a large scale is *** organic chemical hydride method incorporates hydrogen atoms into the molecular structure of a LOHC(Liquid Organic Hydrogen Carrier)to store and transport hydrogen in a liquid state under normal temperature and pressure,and is a highly safe method with low business *** has been developing the technology since 2002,completed a pilot demonstration in 2014 and named it the SPERA Hydrogen^(TM) System,and successfully completed an international supply chain demonstration that transports hydrogen from Brunei to Japan in a large scale in 2020,moving to the commercialization ***,Chiyoda is conducting feasibility studies with a number of domestic and foreign companies with the aim of commercializing the system as soon as *** this paper,outline,features,development status and our efforts in commercialization of SPERA HydrogenTM System are introduced.

关键词： Hydrogen carrier LOHC Methylcyclohexane MCH toluene

Influences of Horticultural Therapy and Functional Recovery Training at a Day-Care Center for the Elderly and Text Mining of Care Records by AI

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Open Journal of Therapy and Rehabilitation 2024年第2期12卷 117-131页

作者： Seigo Koura Shinya Matsutani Kazuho Nagao Yu Fukushima Akiko ikeda Takeshi Oshikawa Tomohiro Inagaki Kentaro Higashi Faculty of Graduate School Postdoctoral Course in Health Care Medicine Nishikyusyu University Kanzaki Japan Social Welfare Corporation Kanjikai Miyakonojyo Japan Sophia Phyto-Therapy College Tokyo Japan

Background: In Japan, due to the COVID-19 pandemic, various behavioral restrictions were implemented from March 2020, resulting in an increased number of elderly people with reduced participation in care and rehabilitation. As a result, the decline in motor and cognitive functions became more pronounced. Purpose: The study examined how activities combining passive horticultural therapy, which is always introduced, with active functional recovery training, which is used in the functional recovery training of patients with hemiplegia, influence the behavior of elder people using the facility. Methods: 36 elder people with care need 1 or 2 who regularly used the day-care facilities after the pandemic ended and who agreed to participate in the study was included. The assessment data were every three months from December 2021 to December 2023 after the COVID-19 pandemic, the MMSE and Moca-J, TMIG-Index, and GDS15. AI-based text mining was used to compare changes in visit reports before and after the introduction of the Posture Chart and Red Code, and the relationship between the language used. Results: The results of MMSE and Moca-J were both significantly higher in Group B and C than in Group A. TIMG assessment, was significantly higher in Group B and C than in Group A, and Group C was significantly higher than Group B. The GDS, an assessment of depression in old age, tended to be significantly higher in Group A than in Groups B and C. In the “Co-Occurrence Network Analysis” shown after the introduction of the latest functional recovery training equipment such as the Red Cord, its results showed a high association between the words Bathing and CARE and words such as POSTURE, Red-Code, and AI, App, which are used in functional training and rehabilitation, and their analysis. Conclusion: At day-care facilities specializing in functional recovery training and rehabilitation, a combination of horticultural therapy and the latest functional training equipment found to help m

关键词： Horticultural Therapy Hand Care Treatment Senior Day-Care Center Functional Recovery Training KH-Corder

Controllable step-flow growth of GaN on patterned freestanding substrate

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Journal of Semiconductors 2024年第2期45卷 46-50页

作者： Peng Wu Jianping Liu Lei Hu Xiaoyu Ren Aiqin Tian Wei Zhou Fan Zhang Xuan Li Masao ikeda Hui Yang Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China

A new kind of step-flow growth mode is proposed,which adopts sidewall as step source on patterned GaN *** terrace width of steps originated from the sidewall was found to change with the growth temperature and ammonia *** growth mechanism is explained and simulated based on step motion *** work helps better understand the behaviors of step advancement and puts forward a method of precisely modulating atomic steps.

关键词： step-flow growth GaN terrace width step motion