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arXiv 2023年

作者： Cui, Yuzhu Hada, Kazuhiro Kawashima, Tomohisa Kino, Motoki Lin, Weikang Mizuno, Yosuke Ro, Hyunwook Honma, Mareki Yi, Kunwoo Yu, Jintao Park, Jongho Jiang, Wu Shen, Zhiqiang Kravchenko, Evgeniya Algaba, Juan-Carlos Cheng, Xiaopeng Cho, Ilje Giovannini, Gabriele Giroletti, Marcello Jung, Taehyun Lu, Ru-Sen Niinuma, Kotaro Oh, Junghwan Ohsuga, Ken Sawada-Satoh, Satoko Sohn, Bong Won Takahashi, Hiroyuki R. Takamura, Mieko Tazaki, Fumie Trippe, Sascha Wajima, Kiyoaki Akiyama, Kazunori An, Tao Asada, Keiichi Buttaccio, Salvatore Byun, Do-Young Cui, Lang Hagiwara, Yoshiaki Hirota, Tomoya Hodgson, Jeffrey Kawaguchi, Noriyuki Kim, Jae-Young Lee, Sang-Sung Lee, Jee Won Lee, Jeong Ae Maccaferri, Giuseppe Melis, Andrea Melnikov, Alexey Migoni, Carlo Oh, Se-Jin Sugiyama, Koichiro Wang, Xuezheng Zhang, Yingkang Chen, Zhong Hwang, Ju-Yeon Jung, Dong-Kyu Kim, Hyo-Ryoung Kim, Jeong-Sook Kobayashi, Hideyuki Li, Bin Li, Guanghui Li, Xiaofei Liu, Zhiyong Liu, Qinghui Liu, Xiang Oh, Chung-Sik Oyama, Tomoaki Roh, Duk-Gyoo Wang, Jinqing Wang, Na Wang, Shiqiang Xia, Bo Yan, Hao Yeom, Jae-Hwan Yonekura, Yoshinori Yuan, Jianping Zhang, Hua Zhao, Rongbing Zhong, Weiye Research Center for Intelligent Computing Platforms Zhejiang Laboratory Hangzhou311100 China Tsung-Dao Lee Institute Shanghai Jiao Tong University 520 Shengrong Road Shanghai201210 China Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Mizusawa VLBI Observatory National Astronomical Observatory of Japan 2-12 Hoshigaoka Mizusawa Iwate Oshu023-0861 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwanoha Chiba Kashiwa277-8582 Japan Kogakuin University of Technology & Engineering Academic Support Center 2665-1 Nakano-machi Hachioji Tokyo192-0015 Japan South-Western Institute For Astronomy Research Yunnan University Kunming650500 China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Institut für Theoretische Physik Goethe-Universität Frankfurt Max-von-Laue-Straße 1 Frankfurt am MainD-60438 Germany Korea Astronomy & Space Science Institute Daedeokdae-ro 776 Yuseong-gu Daejeon34055 Korea Republic of Department of Astronomy Yonsei University Yonsei-ro 50 Seodaemun-gu Seoul03722 Korea Republic of Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Department of Physics and Astronomy Seoul National University Gwanak-gu Seoul08826 Korea Republic of Department of Information Countermeasure Air Force Early Warning Academy Wuhan430019 China Institute of Astronomy and Astrophysics Academia Sinica HiloHI96720 United States Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Beijing100101 China Moscow Institute of Physics and Technology Dolgoprudny Institutsky per. 9 Moscow141700 Russia Lebedev Physical Institute The Russian Academy of Sciences Leninsky prospekt 53 Moscow119991 Russia Department of Physics Faculty of Science U

The nearby radio galaxy M87 offers a unique opportunity to explore the connections between the central supermassive black hole and relativistic jets. Previous studies of the inner region of M87 revealed a wide opening angle for the jet originating near the black hole 1–4. The Event Horizon Telescope resolved the central radio source and found an asymmetric ring structure consistent with expectations from General Relativity 5. With a baseline of 17 years of observations, there was a shift in the jet’s transverse position, possibly arising from an eight to ten-year quasi-periodicity 3. However, the origin of this sideways shift remains unclear. Here we report an analysis of radio observations over 22 years that suggests a period of about 11 years in the position angle variation of the jet. We infer that we are seeing a spinning black hole that induces the Lense-Thirring precession of a misaligned accretion disk. Similar jet precession may commonly occur in other active galactic nuclei but has been challenging to detect owing to the small magnitude and long period of the variation. Copyright © 2023, The Authors. All rights reserved.

关键词： Active Galactic Nuclei

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Deep Learning in Digital Breast Tomosynthesis: Current Status, Challenges, and Future Trends

MedComm

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MedComm 2025年第6期6卷 e70247页

作者： Wang, Ruoyun Chen, Fanxuan Chen, Haoman Lin, Chenxing Shuai, Jincen Wu, Yutong Ma, Lixiang Hu, Xiaoqu Wu, Min Wang, Jin Zhao, Qi Shuai, Jianwei Pan, Jingye Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine Vision and Brain Health) Wenzhou Institute University of Chinese Academy of Sciences Wenzhou China Wenzhou Medical University Wenzhou China UCSC Baskin School of Engineering University of California Santa Cruz CA United States Key Laboratory of Intelligent Treatment and Life Support for Critical Diseases of Zhejiang Province Wenzhou China Department of Anatomy Histology & Embryology School of Basic Medical Sciences Fudan University Shanghai China Department of Medicine Harvard Medical School and Brigham and Women's Hospital Boston MA United States Joint Research Centre on Medicine The Affiliated Xiangshan Hospital of Wenzhou Medical University Ningbo China Stony Brook University Stony Brook NY United States School of Computer Science and Software Engineering University of Science and Technology Liaoning Anshan China Department of Big Data in Health Science The First Affiliated Hospital of Wenzhou Medical University Wenzhou China Zhejiang Engineering Research Center for Hospital Emergency and Process Digitization Wenzhou China

The high-resolution three-dimensional (3D) images generated with digital breast tomosynthesis (DBT) in the screening of breast cancer offer new possibilities for early disease diagnosis. Early detection is especially important as the incidence of breast cancer increases. However, DBT also presents challenges in terms of poorer results for dense breasts, increased false positive rates, slightly higher radiation doses, and increased reading times. Deep learning (DL) has been shown to effectively increase the processing efficiency and diagnostic accuracy of DBT images. This article reviews the application and outlook of DL in DBT-based breast cancer screening. First, the fundamentals and challenges of DBT technology are introduced. The applications of DL in DBT are then grouped into three categories: diagnostic classification of breast diseases, lesion segmentation and detection, and medical image generation. Additionally, the current public databases for mammography are summarized in detail. Finally, this paper analyzes the main challenges in the application of DL techniques in DBT, such as the lack of public datasets and model training issues, and proposes possible directions for future research, including large language models, multisource domain transfer, and data augmentation, to encourage innovative applications of DL in medical imaging. © 2025 The Author(s). MedComm published by Sichuan International Medical Exchange & Promotion Association (SCIMEA) and John Wiley & Sons Australia, Ltd.

关键词： deep learning digital breast tomosynthesis early breast cancer screening medical image analysis public database

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AGE Challenge: Angle Closure Glaucoma Evaluation in Anterior Segment Optical Coherence Tomography

arXiv

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arXiv 2020年

作者： Fu, Huazhu Li, Fei Sun, Xu Cao, Xingxing Liao, Jingan Orlando, José Ignacio Tao, Xing Li, Yuexiang Zhang, Shihao Tan, Mingkui Yuan, Chenglang Bian, Cheng Xie, Ruitao Li, Jiongcheng Li, Xiaomeng Wang, Jing Geng, Le Li, Panming Hao, Huaying Liu, Jiang Kong, Yan Ren, Yongyong Bogunović, Hrvoje Zhang, Xiulan Xu, Yanwu State Key Laboratory Zhongshan Ophthalmic Center Sun Yat-sen University Guangzhou510060 China Inception Institute of Artificial Intelligence Abu Dhabi United Arab Emirates Intelligent Healthcare Unit Baidu Beijing China School of Computer Science and Engineering South China University of Technology GuangzhouGuangdong China National Scientific and Technical Research Council CONICET Argentina Tandil Argentina School of Computer Science and Technology Hangzhou Dianzi University Hangzhou China Tencent Jarvis Lab Shenzhen China School of Software Engineering South China University of Technology Guangzhou China School of Biomedical Engineering Health Science Center Shenzhen University Shenzhen China School of Electronic and Information Engineering Shenzhen University Shenzhen China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong School of Electronic and Information Engineering Soochow University Suzhou China Ningbo University Zhejiang China Ningbo Institute of Industrial Technology Chinese Academy of Sciences Zhejiang China Southern University of Science and Technology Shenzhen China Shanghai Jiaotong University Shanghai China Laboratory for Ophthalmic Image Analysis Department of Ophthalmology Medical University of Vienna Vienna Austria

Angle closure glaucoma (ACG) is a more aggressive disease than open-angle glaucoma, where the abnormal anatomical structures of the anterior chamber angle (ACA) may cause an elevated intraocular pressure and gradually leads to glaucomatous optic neuropathy and eventually to visual impairment and blindness. Anterior Segment Optical Coherence Tomography (AS-OCT) imaging provides a fast and contactless way to discriminate angle closure from open angle. Although many medical image analysis algorithms have been developed for glaucoma diagnosis, only a few studies have focused on AS-OCT imaging. In particular, there is no public AS-OCT dataset available for evaluating the existing methods in a uniform way, which limits the progress in the development of automated techniques for angle closure detection and assessment. To address this, we organized the Angle closure Glaucoma Evaluation challenge (AGE), held in conjunction with MICCAI 2019. The AGE challenge consisted of two tasks: scleral spur localization and angle closure classification. For this challenge, we released a large data of 4800 annotated AS-OCT images from 199 patients, and also proposed an evaluation framework to benchmark and compare different models. During the AGE challenge, over 200 teams registered online, and more than 1100 results were submitted for online evaluation. Finally, eight teams participated in the onsite challenge. In this paper, we summarize these eight onsite challenge methods and analyze their corresponding results in the two tasks. We further discuss limitations and future directions. In the AGE challenge, the top-performing approach had an average Euclidean Distance of 10 pixel (10µm) in scleral spur localization, while in the task of angle closure classification, all the algorithms achieved the satisfactory performances, especially, 100% accuracy rate for top-two performances. These artificial intelligence techniques were shown to have the potential to enable new developments in AS-OCT

关键词： Ophthalmology

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Lattice Distortion and H-passivation in Pure Carbon Electrocatalysts for Efficient and Stable Two-electron Oxygen Reduction to H2O2

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Angewandte Chemie 2023年第49期135卷

作者： Liangxu Lin Liang Huang Chang Wu Yu Gao Naihua Miao Chao Wu Aaron T. Marshall Yi Zhao Jiazhao Wang Jun Chen Shixue Dou Gordon G. Wallace Wei Huang Strait Institute of Flexible Electronics (SIFE Future Technologies) Fujian Normal University and Strait Laboratory of Flexible Electronics (SLoFE) Fuzhou 350017 China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China Chemical and Process Engineering MacDiarmid Institute for Advanced Materials and Nanotechnology University of Canterbury Christchurch 8041 New Zealand Center for Integrated Computational Materials Engineering School of Materials Science and Engineering Beihang University Beijing 100191 China Institute of Energy Materials Science University of Shanghai for Science and Technology Shanghai 200093 China Institute for Superconducting & Electronic Materials (ISEM) Innovation Campus University of Wollongong Squires Way North Wollongong NSW 2522 Australia Institute for Carbon Neutralization College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325035 China ARC Centre of Excellence for Electromaterials Science Intelligent Polymer Research Institute (IPRI) Australia Institute for Innovative Materials (AIIM) Innovation Campus University of Wollongong Squires Way North Wollongong NSW 2522 Australia Frontiers Science Center for Flexible Electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLoFE) Northwestern Polytechnical University Xi'an 710072 China

The exploration of inexpensive and efficient catalysts for oxygen reduction reaction (ORR) is crucial for chemical and energy industries. Carbon materials have been proved promising with different catalysts enabling 2 and 4e − ORR. Nevertheless, their ORR activity and selectivity is still complex and under debate in many cases. Many structures of these active carbon materials are also chemically unstable for practical implementations. Unlike the well-discussed structures, this work presents a strategy to promote efficient and stable 2e − ORR of carbon materials through the synergistic effect of lattice distortion and H-passivation (on the distorted structure). We show how these structures can be formed on carbon cloth, and how the reproducible chemical adsorption can be realized on these structures for efficient and stable H 2 O 2 production. The work here gives not only new understandings on the 2e − ORR catalysis, but also the robust catalyst which can be directly used in industry.

关键词： Carbon Materials Dangling States H-Passivation Lattice Distortion Oxygen Reduction Reactions

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Maldistribution of Chemical Bond Strength Inducing Exceptional Anisotropy of Thermal Conductivity in Non-Layered Materials

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Angewandte Chemie 2023年第27期135卷

作者： Yang Hua Dr. Wei Bai Shengnan Dai Rongjie He Dr. Pengfei Nan Liang Sun Prof. Jiong Yang Prof. Bo Sun Prof. Binghui Ge Prof. Chong Xiao Prof. Yi Xie Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China 230026 Hefei Anhui P. R. China Institute of Energy Hefei Comprehensive National Science Center 230031 Hefei Anhui P. R. China Materials Genome Institute Shanghai University 200444 Shanghai P. R. China Tsinghua-Berkeley Shenzhen Institute Tsinghua University 518055 Shenzhen Guangdong P. R. China Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information Technology Anhui University 230601 Hefei Anhui P. R. China Institute of Material Research Tsinghua Shenzhen International Graduate School Guangdong Provincial Key Laboratory of Thermal Management Engineering and Materials Tsinghua University 518055 Shenzhen Guangdong P. R. China Dalian National Laboratory for Clean Energy Chinese Academy of Science 116023 Dalian Liaoning P. R. China

Currently, the efforts to find materials with high κ anisotropy ratios mainly focus on layered materials, however, the limited quantity and lower workability comparing to non-layered ones boost the exploration of non-layered materials with high κ anisotropy ratios. Here, taking PbSnS 3 , a typical non-layered orthorhombic compound, as an example, we propose that maldistribution of chemical bond strength can lead to large anisotropy of κ in non-layered materials. Our result reveals that the maldistribution of Pb−S bonds lead to obvious collective vibrations of dioctahedron chain units, resulting in an anisotropy ratio up to 7.1 at 200 K and 5.5 at 300 K, respectively, which is one of the highest ever reported in non-layered materials and even surpasses many classical layered materials such as Bi 2 Te 3 and SnSe. Our findings can not only broaden the horizon for exploring high anisotropic κ materials but also provide new opportunities for the application of thermal management.

关键词： Anisotropy Non-Layered Materials Thermal Conductivity

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ECNU at 2017 eHealth task 2: Technologically assisted reviews in empirical medicine 18

ECNU at 2017 eHealth task 2: Technologically assisted review...

引用

18th Working Notes of CLEF Conference and Labs of the Evaluation Forum, CLEF 2017

作者： Chen, Jiayi Chen, Su Song, Yang Liu, Hongyu Wang, Yueyao Hu, Qinmin He, Liang Yang, Yan Department of Computer Science and Technology East China Normal University Shanghai200062 China Shanghai Engineering Research Center of Intelligent Service Robot Shanghai China

The 2017 CLEF eHeath Task2 requires to rank the retrieval results given by medical database. The purpose is to reduce efforts that experts devote to finding indeed relevant documents. We utilize a customized Learning-to-Rank model to re-rank the retrieval result. Additionally, we adopt word2vec to represent queries and documents and compute the relevant score by cosine distance. We find that the combination of the two methods achieves a better performance.

关键词： Medical computing

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Development of derivatization-enhanced EIEIO-driven glycosidic linkage sequencing (DEED-GL-Seq) strategy and its application to glycogen-sourced oligosaccharides profiling

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Carbohydrate Polymers 2025年 366卷

作者： Xin Zheng Yufang Ma Xinge Cui Yi Wang Jingjing Jiang Ting Liu Zhijun Zhang Mingsheng Ma Xiaohong Han Cai Tie Clinical Pharmacology Research Center Peking Union Medical College Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100730 China NMPA Key Laboratory for Clinical Research and Evaluation of Drug Beijing Key Laboratory of Key Technologies for Early Clinical Trial Evaluation of Innovative Drugs for Major Diseases Beijing 100730 China Institute of Clinical Medicine Peking Union Medical College Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100730 China State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources School of Chemical and Environmental Engineering China University of Mining and Technology-Beijing Ding11 Xueyuan Road Beijing 100083 China Department of Pediatrics Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100730 China SCIEX Analytical Instrument Trading Co. Ltd. Shanghai 200335 China School of Chemical and Environmental Engineering China University of Mining and Technology-Beijing Beijing 100083 China

The structural complexity arising from diverse glycosidic linkages in oligosaccharides hinders the elucidation of their biological functions. Existing analytical methods often lack the necessary feasibility and accessibility for comprehensive linkage analysis. To address this, we developed Derivatization-Enhanced EIEIO-Driven Glycosidic Linkage Sequencing (DEED-GL-Seq), a novel strategy leveraging differential electron density modulation around glycosidic bonds upon N 2 ,N 2 ,N 4 ,N 4 -tetraethyl-6-hydrazineyl-1,3,5-triazine-2,4-diamine (T3) derivatization. This method integrates EIEIO MS 2 to identify glycosidic bond-specific diagnostic fragments for linkage determination. Validation confirmed DEED-GL-Seq's specificity, sensitivity, reliability, and standard-independence. Coupling with fine-tuned HILIC separation further enhanced its analytical power for complex matrices. We applied DEED-GL-Seq to profile oligosaccharides derived from partially hydrolyzed glycogen, validating our results against reference standards. By analyzing the abundance ratios of specific trisaccharides, we predicted the branching degrees of glycogen and amylopectin, corroborating existing literature. Notably, DEED-GL-Seq identified established (Glc₄) and novel (HEX-1, HEX-2, HEPTA-1, HEPTA-2) potential glycosidic biomarkers for GSD-II in urine, with the novel oligosaccharides showing superior diagnostic performance. The unique structure of HEX-2 suggests distinct biosynthetic pathways in GSD-II pathophysiology. DEED-GL-Seq represents a significant advancement in glycomics, offering a powerful tool for comprehensive oligosaccharide profiling and laying a foundation for in-depth functional investigations. This work presents a novel application paradigm for EIEIO technology.

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Two-fluid effects on resistive wall modes in plasmas with negative versus positive triangularity

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Nuclear Fusion 2025年第7期65卷 076019-076019页

作者： Xu Yang Yueqiang Liu Li Li Jiao Yuan Xin He Yuling He Guoliang Xia Guanqi Dong Department of Physics and Chongqing Key Laboratory of Intelligent Perception and BlockChain Technology Chongqing Technology and Business University Chongqing 400067 China General Atomics PO Box 85608 San Diego CA 92186-5608 United States of America College of Science Donghua University Shanghai 201620 China Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter School of Physics South China Normal University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum Matter South China Normal University Guangzhou 510006 China UKAEA Culham Campus Abingdon OX14 3DB United Kingdom of Great Britain and Northern Ireland Southwestern Institute of Physics PO Box 432 Chengdu 610041 China

The MARS-F code (Liu et al 2000 Phys. Plasmas 7 3681), has been updated to include two-fluid (2F) effects for linear stability analysis of magneto-hydrodynamic modes. The updated code, referred to as MARS-2F, is then ...

The MARS-F code (Liu et al 2000 Phys. Plasmas 7 3681), has been updated to include two-fluid (2F) effects for linear stability analysis of magneto-hydrodynamic modes. The updated code, referred to as MARS-2F, is then applied to study flow stabilization of the resistive wall mode (RWM) in a reactor-scale negative-triangularity (NT) plasma, with the results also compared to that obtained in a positive-triangularity counterpart. The RWM is computed to be stable in plasmas with slow or even vanishing toroidal fluid flow according to the 2F-model, with much wider stability window for the NT plasma. This stability regime is attributed to the E × B flow stabilization, which is finite even at vanishing (single) fluid flow since the diamagnetic flow remains finite. This finding provides an alternative interpretation of the RWM stability in the slow-flow regime in tokamak plasmas as observed in experiments. Varying the fluid flow shear and a parallel sound wave damping model confirms the robustness of the 2F-model in predicting the stable window for the RWM in the slow-fluid-flow regime.

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Design and Experimental Study on a Shallow Water Underwater Glider

Design and Experimental Study on a Shallow Water Underwater ...

引用

IEEE/ASME International Conference on Advanced intelligent Mechatronics

作者： Yanji Liu Jie Ma Yanbo Liu Guichen Zhang Xiaoling Tan The State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai China Department of Intelligent Robot Shanghai Industrial Technology Institute Shanghai China Merchat Marine College Shanghai Maritime University Shanghai China The Research and Development Center Shanghai GrandTop Electric Technology Co. Ltd. Shanghai China

The conventional underwater gliders run at low gliding velocity and the regulating speed of the buoyancy system is slow. It is difficult to glide in shallow waters. In this paper, we present a design of the "Enlightens", an underwater glider that runs in shallow waters. Based on the theoretical model and combined with empirical methods of analysis, the process to determine the parameters of each part of the glider is simplified. The internal structure of the glider designed is concise and compact. The battery pack, buoyancy regulating system and the executive mechanism are mounted to the inner supports. The parameters of the buoyancy regulating system are obtained based on the dynamic equations, and the system regulating the buoyancy rapidly by a screw. A fin and rudder device are adopted to reduce the turning radius of the glider for the purpose of further improvement of the maneuverability. The experimental results show that the glider transforms the pitching attitude rapidly, and it can glide at a depth of 3m underwater with a turning radius of about 10m.

关键词： Conferences Mechatronics

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research on reducing torque ripple of permanent magnet AC servo motor 49

Research on reducing torque ripple of permanent magnet AC se...

引用

49th International Symposium on robotics, ISR 2017

作者： Chen, Feilong Hu, Yusheng Xiao, Shengyu Yang, Wende Zhong, Chengbao Gree Electric Appliances Inc Guangdong Intelligent Equipment Engineering Technology Research Center Center for Research and Development of Robot Engineering in Zhuhai Zhuhai China

With the vigorous development of intelligent equipment, as the core components of intelligent equipment such as robots, permanent magnet AC servo motor has been more and more attention and application. In the high-precision intelligent equipment occasions require permanent magnet servo motor torque ripple are getting smaller and *** torque ripple is too large, will affect the servo system positioning accuracy and speed stability, and thus have a bad impact on the practical application of intelligent equipment such as robots. So the analysis and reduce the permanent magnet AC servo motor torque ripple become the focus of domestic and foreign permanent magnet servo motor research. In this paper, the generation mechanism of torque ripple of permanent magnet servo motor is analyzed, and the simulation model of permanent magnet servo motor is established. And then from the following three major aspects of the analysis of the torque ripple: 1, mechanical manufacturing factors, such as the roundness of the stator, the rotor eccentric;2, The influence of the number of slots and the number of poles on the torque ripple;3, The ratio of the cogging torque and the ripple torque to the torque ripple value. Finally, the actual measurement of the product torque ripple verification theory analysis and simulation model accuracy. Through the above analysis, Combined with the specific product design, considering the selection of cogging torque reduction means, select the optimal number of slots and the number of poles, the Back electromotive force(Back EMF) becomes more sinusoidal, improve the manufacturing process, the product torque ripple values further reduced. Through the analysis and research of this paper, it not only laid a theoretical foundation for reducing the torque ripple of permanent magnet AC servo motor, but also put forward the problems in the reduction of torque ripple, and pointed out the direction for the next step, and provides valuable engineering experie

关键词： Permanent magnets

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