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Magnetic anisotropy manipulation and interfacial coupling in Sm_(3)Fe_(5)O_(12)films and CoFe/Sm_(3)Fe_(5)O_(12)heterostructures

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Chinese Physics B 2021年第12期30卷 583-590页

作者： Lei Shen Guanjie Wu Tao Sun Zhi Meng Chun Zhou Wenyi Liu Kang Qiu Zongwei Ma Haoliang Huang Yalin Lu Zongzhi Zhang Zhigao Sheng Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of Sciences(CAS)Hefei 230031China University of Science and Technology of China Hefei 230026China Shanghai Ultra-Precision Optical Manufacturing Engineering Research Center and Key Laboratory of Micro and Nano Photonic Structures(MOE) Department of Optical Science and EngineeringFudan UniversityShanghai 200433China Anhui Laboratory of Advanced Photon Science and Technology Hefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Photovoltaic and Energy Conservation Materials Chinese Academy of SciencesHefei 230031China

The magnetic anisotropy manipulation in the Sm_(3)Fe_(5)O_(12)(SmIG)films and its effect on the interfacial spin coupling in the CoFe/SmIG heterostructures were studied *** switching the orientation of the Gd_(3)Ga_(5)O_(12)substrates from(111)to(001),the magnetic anisotropy of obtained SmIG films shifts from in-plane to *** results can also be obtained in the films on Gd_(3)Ga_(5)O_(12)substrates,which identifies the universality of such orientation-induced magnetic anisotropy ***,the interfacial spin coupling and magnetic anisotropy switching effect on the spin wave in CoFe/SmIG magnetic heterojunctions have also been explored by utilizing the time-resolved magneto-optical Kerr effect *** is intriguing to find that both the frequency and effective damping factor of spin precession in CoFe/SmIG heterojunctions can be manipulated by the magnetic anisotropy switching of SmIG *** findings not only provide a route for the perpendicular magnetic anisotropy acquisition but also give a further path for spin manipulation in magnetic films and heterojunctions.

关键词： perpendicular magnetic anisotropy Sm_(3)Fe_5O_(12)films interfacial spin coupling CoFe/Sm_(3)Fe_5O_(12)heterojunction

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Orientation Dependence of Dislocations in Al Layer of Mg/Al Laminates: High-Resolution EBSD Analysis

SSRN

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SSRN 2024年

作者： Peng, Peng Jiang, Shaosong Jia, Yong Han, Cong Zhang, Jinyuan Li, Yang Lu, Zhen National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China Ji Hua Laboratory Advanced Manufacturing Science and Technology Guangdong Laboratory Foshan528200 China Harbin Yuhang jingchuang Technology Co. Ltd Harbin150010 China

In this study, the cross-correlation based high-resolution electron backscatter diffraction (HR-EBSD) was used to measure the densities of geometrically necessary dislocations (GNDs) within the Al layers of Mg/Al laminates at different rolling reductions. Dislocation densities with a lower limit of 3.85×1012 m-2 were derived in the alloy. The orientation evolution and dislocation structure during the rolling process were investigated by virtue of the HR-EBSD technique. In addition, a statistical approach was used to examine the relations between texture components, dislocations, and the Taylor factor. Results indicated that dislocations tended to accumulate in "soft" grains with low Taylor factors at the onset of deformation. However, under large strains, the Taylor factor exhibited a positive correlation with the dislocation density, indicating that harder-to-yield grains tended to store a greater number of dislocations. This trend became more notable with higher rolling reduction. © 2024, The Authors. All rights reserved.

关键词： Aluminum alloys

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manufacturing Service Network of Digital Twin Systems Under Cloud Computing Environment 32

Manufacturing Service Network of Digital Twin Systems Under ...

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32nd CIRP Design Conference, CIRP Design 2022

作者： Xiang, Feng Zhou, Ping Zuo, Ying Tao, Fei Zhang, Dashun Key Laboratory Of Metallurgical Equipment And Control Technology Ministry Of Education Wuhan University Of Science And Technology Wuhan430081 China Hubei Key Laboratory Of Mechanical Transmission And Manufacturing Engineering Wuhan University Of Science And Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University Of Science And Technology Wuhan430081 China Research Institute For Frontier Science Beihang University Beijing100191 China School Of Automation Science And Electrical Engineering Beihang University Beijing100191 China No.55 Research Institute China North Industries Group Corporation Changchun130012 China

With the promotion and application of the digital twin system in the industrial Internet platform, and around the "intelligent, integrated, and service-oriented"manufacturing characteristics, a digital twin system manufacturing service network with full-process, full-object, and full-factor coverage of virtual and real resources has gradually formed. In a typical cloud computing environment, this paper defines the manufacturing service network of the digital twin system based on the virtual and real mapping, simulation calculation, feedback control and other characteristic requirements of the digital twin system, and constructs the network model from the network nodes and network connections. Based on this, the optimization steps for resource allocation of manufacturing service network based on the digital twin system, and the key technologies for the construction of the manufacturing service network of the digital twin system are analyzed. © 2022 The Authors.

关键词： Resource allocation

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Data-driven Rational Feedforward Tuning Algorithm Based on Self-adaptive Hybrid Self-learning TLBO

Data-driven Rational Feedforward Tuning Algorithm Based on S...

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Data Driven Control and Learning Systems (DDCLS)

作者： Siwen Chen Yang Liu Fazhi Song Key Laboratory of Ultra-Precision Intelligent Instrumentation Ministry of Industry and InformationTechnology Harbin Institute of Technology Harbin China State Key Lab of Digital Manufacturing Equipment & Technology Huazhong University of Science and Technology wuhan China

Data-driven feedforward tuning algorithm, extensively used in ultra-precision motion stage, can significantly compensate tracking errors and optimize task adaptability. However, the rational basis based feedforward optimization usually faces non-convex optimization, numerical stability and initial value problems. The purpose of this paper is to propose a feedforward tuning algorithm based on the heuristic method self-adaptive hybrid self-learning TLBO. The algorithm can converge to the ideal feedforward parameter, so that the system can achieve high tracking accuracy, and has good numerical properties and low initial value requirements. The effectiveness and superiority of the proposed method are verified by simulation.

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A calculation method of gear tooth surface wear considering the center distance error

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Wear 2025年 570卷

作者： Wang, Hongbing Feng, Shicheng Yin, Lairong Hu, Bo Su, Jie Liu, Huihua Zhou, Changjiang Hunan Provincial Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Changsha410114 China Xuchang Tobacco Machinery Co. Ltd. Xuchang461000 China Beijing Engineering Research Center of Precision Measurement Technology and Instruments Beijing University of Technology Beijing100124 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha410082 China

In gear transmission, manufacturing/installation error and bearing radial clearance led to the variation of the center distance, changing the contact characteristic and subsequently affecting the wear behavior and the fatigue life of the tooth surfaces. In this work, a center distance error model of the gears with the manufacturing/installation error and the bearing radial clearance was derived, and a nonlinear dynamic model of the gear pair considering the variation of the center distance was established. The contact pressure distribution on the tooth surfaces under the dynamic load was obtained by combining the gear meshing principle and the Hertzian contact theory. A general calculation model of the sliding distance between the contact points in the meshing process of the gear pair was derived based on the single point observation method, and the wear depths of the tooth surfaces under the quasi-static and the dynamic load considering the center distance error were determined based on the Archard's adhesive wear model. The presented work found that the wear depth of the tooth surface under the dynamic load fluctuates around the wear depth distribution under the quasi-static load. When considering the center distance error caused by the manufacturing/installation error and the bearing radial clearance, the maximum wear depth at the tooth tip of the driving gear increases as the actual center distance increases, while the maximum wear depth at the tooth root decreases. As for the driven gear, the maximum wear depth at the tooth tip decreases as the actual center distance increases, while the maximum wear depth at the tooth root increases with the actual center distance. The conclusions in this research work can provide a basis for the strength enhancement design of the gears which performance is affected by the center distance error such small-modulus gear pair. © 2025 Elsevier B.V.

关键词： Gear teeth

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A Method of Extracting Corner Features from Laser Point Cloud Data

A Method of Extracting Corner Features from Laser Point Clou...

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2022 Chinese Automation Congress, CAC 2022

作者： Dong, Shuzhou Li, Qian Gao, Han Kasimov, Farkhod Zhang, Dong Institute of Automation Qilu University of Technology Shandong Academy of Sciences Provincial Key Laboratory of Robot and Manufacturing Automation Technology Shandong China Jinan Lashan Aviation Technology Co.Ltd China Department of Computer Science-Automation and Management Tashkent chemical-technological institute Jinan250014 China

ISBN: (纸本)9781665465335

With the development of robot technology, the requirement of target recognition accuracy for depalletizing robot based on lidar is constantly improved. In order to solve the problems of large data acquisition error and low target recognition accuracy caused by environmental interference during lidar operation, a new corner feature extraction method is proposed in this paper. Firstly, based on the anomaly detection LOF algorithm, a data preprocessing method is designed to improve the accuracy of lidar data acquisition.;Then, the Douglas-Pucker algorithm is used for data segmentation to obtain the straight line segment features and corner features of the stacking object boundary. The corner features are further determined by re-judgment method to improve the accuracy of corner features. Finally, this paper designs a comparative experiment based on the data collected by lidar, and the experimental results verify the feasibility of the improved algorithm in this paper in terms of outlier removal and corner feature extraction. © 2022 IEEE.

关键词： Optical radar

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Effects of interlayer coupling on the excitons and electronic structures of WS_(2)/hBN/MoS_(2) van der Waals heterostructures

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Nano Research 2022年第3期15卷 2674-2681页

作者： Xudan Zhu Junbo He Rongjun Zhang Chunxiao Cong Yuxiang Zheng Hao Zhang Songyou Wang Haibin Zhao Meiping Zhu Shanwen Zhang Shaojuan Li Liangyao Chen Key Laboratory of Micro and Nano Photonic Structures Ministry of EducationShanghai Engineering Research Center of Ultra-Precision Optical ManufacturingSchool of Information Science and EngineeringFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and EngineeringFudan UniversityShanghai 200433China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Grating Technology Laboratory Changchun Institute of Optics and Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Inserting hexagonal boron nitride(hBN)as barrier layers into bilayer transition metal dichalcogenides heterointerface has been proved an efficient method to improve two dimensional tunneling optoelectronic device ***,the physical picture of interlayer coupling effect during incorporation of monolayer(1L-)hBN is not explicit *** this article,spectroscopic ellipsometry was used to experimentally obtain the broadband excitonic and critical point properties of WS_(2)/MoS_(2)and WS_(2)/hBN/MoS_(2)van der Waals *** find that 1L-hBN can only slightly block the interlayer electron transfer from WS_(2)layer to MoS_(2)***,insertion of 1L-hBN weakens the interlayer coupling effect by releasing quantum confinement and reducing efficient dielectric ***,the exciton binding energies in WS_(2)/hBN/MoS_(2)heterostructures blueshift comparing to those in WS_(2)/MoS_(2)*** this exciton binding energies tuning process,the reducing dielectric screening effect plays a leading *** the meantime,the quasi-particle(QP)bandgap remains unchanged before and after 1L-hBN insertion,which is attributed to released quantum confinement and decreased dielectric screening effects canceling each *** QP bandgap as along with blueshift exciton binding energies lead to the redshift exciton transition energies in WS_(2)/hBN/MoS_(2)heterostructures.

关键词： two-dimensional(2D)van der Waals heterostructure interlayer coupling excitons critical points spectroscopic ellipsometry

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Damage characteristics of fused silica under low-temporal coherence light

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High Power Laser science and Engineering 2024年第3期12卷 77-83页

作者： Chong Shan Lingbao Kong Fujian Li Yong Cui Lailin Ji Quan Zheng Daxing Rao Ruijing He Xiaohui Zhao Yuanan Zhao Zhan Sui Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing School of Information Science and TechnologyFudan UniversityShanghaiChina Shanghai Institute of Laser Plasma China Academy of Engineering PhysicsShanghaiChina Key Laboratory of High Power Laser Materials Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina

The damage characteristics of fused silica were investigated under low-temporal coherence light(LTCL).It was found that the laser-induced damage threshold(LIDT)of fused silica for the LTCL was lower than that of the single longitudinal mode pulse laser,and for the LTCLs,the LIDTs decrease with the increasing of laser bandwidth,which is not consistent with the temporal spike *** is due to the nonlinear self-focusing effect and multi-pulse accumulation *** specific reasons were analyzed based on theoretical simulation and experimental *** research work is helpful and of great significance for the construction of high-power LTCL devices.

关键词： laser-induced damage threshold low-temporal coherence light nonlinear self-focusing effect temporal spike

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AgInS_(2)/ZnS quantum dots for noninvasive cervical cancer screening with intracellular pH sensing using fluorescence lifetime imaging microscopy

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Nano Research 2022年第6期15卷 5193-5204页

作者： Wenhua Su Dan Yang Yulan Wang Yawei Kong Wanlu Zhang Jing Wang Yiyan Fei Ruiqian Guo Jiong Ma Lan Mi Department of Optical Science and Engineering Shanghai Engineering Research Center of Ultra-precision Optical ManufacturingKey Laboratory of Micro and Nano Photonic Structures(Ministry of Education)School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Department of Gynecology and Obstetrics The Central Hospital of WuhanTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430014China Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence NanophotonicsSchool of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Institute of Biomedical Engineering and Technology Academy for Engineer and TechnologyFudan University220 Handan RoadShanghai 200433China Shanghai Engineering Research Center of Industrial Microorganisms the Multiscale Research Institute of Complex Systems(MRICS)School of Life SciencesFudan University220 Handan RoadShanghai 200433China

Intracellular pH plays a critical role in biological functions,and abnormal pH values are related to various ***,we report on an intracellular pH sensor AgInS_(2)(AIS)/ZnS quantum dots(QDs)that show long fluorescence lifetimes of hundreds of nanoseconds and low *** lifetime imaging microscopy(FLIM)combined with AIS/ZnS QDs is used for the imaging of live cells in different pH buffers and different cell *** FLIM images of AIS/ZnS QDs in live cells demonstrate different intracellular pH values in different regions,such as in lysosomes or *** method can also distinguish cancer cells from normal cells,and the fluorescence lifetime difference of the AIS/ZnS QDs between the two types of cells is 100±7 *** importantly,the exfoliated cervical cells from 20 patients are investigated using FLIM combined with AIS/ZnS *** lifetime difference value between the normal and cervical cancer(CC)groups is 115±9 ns,and the difference between the normal and the precancerous lesion group is 64±9 *** the first time,the noninvasive method has been used for cervical cancer screening,and it has shown great improvement in sensitivity compared with a clinical conventional cytology examination.

关键词： AIS/ZnS quantum dots fluorescence lifetime imaging microscopy intracellular pH sensing cervical cancer screening noninvasive

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Numerical simulation of materials-oriented ultra-precision diamond cutting:review and outlook

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International Journal of Extreme manufacturing 2023年第2期5卷 1-21页

作者： Liang Zhao Junjie Zhang Jianguo Zhang Houfu Dai Alexander Hartmaier Tao Sun Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Mechanical and Engineering Guizhou UniversityGuizhou 550025People’s Republic of China Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University BochumBochum 44801Germany

Ultra-precision diamond cutting is a promising machining technique for realizing ultra-smooth surface of different kinds of *** fundamental understanding of the impact of workpiece material properties on cutting mechanisms is crucial for promoting the capability of the machining technique,numerical simulation methods at different length and time scales act as important supplements to experimental *** this work,we present a compact review on recent advancements in the numerical simulations of material-oriented diamond cutting,in which representative machining phenomena are systematically summarized and discussed by multiscale simulations such as molecular dynamics simulation and finite element simulation:the anisotropy cutting behavior of polycrystalline material,the thermo-mechanical coupling tool-chip friction states,the synergetic cutting responses of individual phase in composite materials,and the impact of various external energetic fields on cutting *** particular,the novel physics-based numerical models,which involve the high precision constitutive law associated with heterogeneous deformation behavior,the thermo-mechanical coupling algorithm associated with tool-chip friction,the configurations of individual phases in line with real microstructural characteristics of composite materials,and the integration of external energetic fields into cutting models,are ***,insights into the future development of advanced numerical simulation techniques for diamond cutting of advanced structured materials are also *** aspects reported in this review present guidelines for the numerical simulations of ultra-precision mechanical machining responses for a variety of materials.

关键词： diamond cutting ultra-smooth surface material-oriented physics-based simulation model molecular dynamics finite element

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