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作者： Yang, Hui Xu, Zhengyu Key Laboratory of Advanced Manufacturing and Automation Technology Guilin University of Technology Education Department of Guangxi Zhuang Autonomous Region Guilin541006 China College of Mechanical and Control Engineering Guilin University of Technology Guangxi Guilin541004 China

With the rapid development of microelectronic interconnection technology, the reliability requirements of electronic products are becoming higher and higher. Among them, temperature has the greatest impact on electronic devices. Due to the different coefficients of thermal expansion (CTE) between the many materials of a chip, the inside of a solder joint is subjected to cyclic temperature action. Under the effect of cyclic temperature, the solder joints are subject to internal fracture resulting in the failure of the solder joint. Therefore, it is necessary to find a more reliable material for the solder joint. In this paper, the advantages and disadvantages of pure silver material and low silver material are compared by finite element simulation analysis of nano-silver pure silver material and SAC305 low silver material, and the fatigue life prediction of nano-silveris predicted by a life prediction model. Then, using the Electric Power Research Institute estimation method to estimate the fatigue life of solder joints, the results are compared with those calculated by the finite element method. © 2023 Author(s).

关键词： Silver

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Enhancing lithium-ion and electric conductive Li_(2)FeSiO_(4)cathode through in situ boron-doping and carbon-coating strategy

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Rare Metals 2022年第12期41卷 4055-4064页

作者： Hao-Xiang Li Jia-Hui Zhu Xiao-Bing Huang Tao Zhou Yu-Rong Ren Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Water Treatment Functional Materials Hunan Provincial Key Laboratory for Control Technology of Distributed Electric Propulsion AircraftCollege of Chemistry and Materials EngineeringHunan University of Arts and ScienceChangde 415000China Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery Changzhou Key Laboratory of Intelligent Manufacturing and Advanced Technology for Power BatterySchool of Materials Science and EngineeringChangzhou UniversityChangzhou 213164China

The extremely low electrical conductivity and ion-diffusion coefficient of Li_(2)FeSiO_(4)limits its application as a cathode material in lithium-ion ***,in situ boron-doped Li_(2)FeSi_(1)-xB_(x)O_(4-δ)/C(x=0,0.01,0.03,0.05 and 0.07)at the Si site was prepared via the solid-state reaction method using pitch as the c arbon source.B doping in the lattice structure and a c arbon coating on the surface of the composites could effectively enhance the Li^(+)/electron ***,the reduced particle size of the active material with the relatively high specific area via borondoped modification could improve the wettability between the electrolyte and *** the synergistic effect of appropriate boron doping and carbon coating,it exhibits a good rate performance,specific capacity,and cycling *** a result,the as-prepared Li_(2)FeSi_(0.95)B_(0.05)O_(4-δ)/C cathode showed a high discharge capacity of 160.7mAh·g^(-1)at 0.2C,and the capacity retention rate was 96%after 100 cycles at *** work presents an effective path for designing advanced cathode materials for lithium-ion batteries.

关键词： Li_(2)FeSiO_(4) Carbon coating Boron doping Synergistic effect Lithium-ion battery

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A Review of Machine Tool Motorized Spindle Variable Pressure Preload technology Research

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Recent Patents on Engineering 2025年第5期19卷

作者： Dai, Ye Deng, Hao Pan, Gaofeng Chen, Xinda Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education School of Mechanical and Power Engineering Harbin University of Science and Technology Harbin150080 China School of College of Measurement and Control Technology and Communication Engineering Harbin University of Science and Technology Harbin150080 China

High-precision spindles are a vital study topic because of the growing demand for high-speed, high-precision, reliable, and long-lasting machine tools. Bearing preload is the primary means of improving the accuracy of the spindle rotor system. This patent study aims to summarize the research results, systematically analyze and evaluate the machine tool motorized spindle variable pressure preload technology, and provide a scientific basis for the practical application of the motor spindle variable pressure preload technology. This study is an in-depth analysis of the basic principles of the electric spindle preloading technology, the study of its influence mechanism on the thermal deformation, stiffness, slewing error, and life of the spindle system, and a discussion of the current shortcomings in the field of spindle preloading to provide a reference for the subsequent optimization. In the spindle system, the performance of rolling bearings and the design of bearing preload have an important impact on the spindle's accuracy and stability. The traditional preload method has yet to meet the requirements of modern high-speed machine tools. Real-time controllable preload has become the new direction of development, but the current preload technology still has certain limitations and needs to be further improved. In the future, the spindle bearing variable pressure preload technology will be more efficient and intelligent. © 2025 Bentham Science Publishers.

关键词： Machine tools

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Polarization dependences of the laser in 4H-SiC wafer slicing

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Optics Express 2025年第10期33卷 20682-20698页

作者： Sun, Mengping Zhao, Shusen Du, Jiabao Han, Shifei Jiang, Lu Lin, Xuechun Wang, Xubao Laboratory of All-Solid-State Light Sources Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China School of Physics and Optoelectronic Engineering Beijing University of Technology Beijing100124 China Engineering Technology Research Center of All-Solid-State Lasers Advanced Manufacturing Beijing100083 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing101407 China State Key Laboratory of Precision Space-Time Information Sensing Technology Beijing100084 China Key Laboratory of Photonic Control Technology Tsinghua University Ministry of Education Beijing100084 China Department of Precision Instrument Tsinghua University Beijing100084 China

This study focuses on the influence of the polarization of incident light in the laser slicing of 4H-SiC wafers. The structure of longitudinal damage within the material after laser modification was measured and analyzed. The impact of laser pulse energy on this structure was studied. Differences in longitudinal damage under different polarization states were compared. In addition, the effects of laser polarization on the modification of line width and lateral crack propagation were investigated. A vector diffraction model was established to analyze the propagation characteristics of beams with different polarization states during focusing. The results indicate that a linearly polarized beam perpendicular to the scanning direction offers superior modification efficacy compared to other directions of linear polarization and circular polarization. Azimuthally and radially polarized beams substantially decrease the length of longitudinal damage and reduce the difficulty of delamination. Compared to the linearly polarized beam perpendicular to the scanning direction, the azimuthally polarized beam reduces the longitudinal damage length by 49.3% and the delamination stress by 47.0%. In comparison, the radially polarized beam reduces the longitudinal damage length by 39.4% and the delamination stress by 53.8%. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Circular polarization

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Research on magnetic fluid precise localized lubrication thrust cylindrical roller bearing with low-friction micro-vibration and high load-bearing capacity 7

Research on magnetic fluid precise localized lubrication thr...

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7th International Conference on Mechanical, Electric, and Industrial Engineering, MEIE 2024

作者： Rui, Hu Hansheng, Chen Haoran, Zhang Humao, Wei Junpeng, Gui Songshan, Yan Hougen, Luo Yi, Guo Chunxia, Xu Jianwu, Yan Lei, Zhang Guoliang, Liu Jiang Xi Province Key Laboratory of Precision Drive & Control Nanchang Institute of Technology Nanchang330099 China Advanced Smart Manufacturing Academy Nanchang University Nanchang330031 China School of Mechanical and Electronic Engineering Wuhan University of Technology Wuhan430070 China

As the magnetic field that is difficult to be distributed in the existing magnetic fluid thrust cylindrical roller bearing structure, it is more difficult for the magnetic fluid to be evenly distributed inside the bearing raceway with the axial localized lubrication, which seriously affects the engineering application of the magnetic fluid bearing. To solve the magnetic field control problem that the magnetic fluid is uneasy to be accurately localized and adsorbed, a new type of magnetic fluid thrust cylindrical roller bearing is designed in this study, which shows good characteristics of low-friction, micro-vibration and high load-bearing capacity. The seat-ring is set as an annular raceway that can be used for magnetic fluid storage and matching with the roller lubrication system, and an annular permanent magnet is designed as an external magnetic field source to be placed below the annular raceway to adsorb the magnetic fluid on the friction surface. The structure design of the axial magnetic fluid localized lubrication bearing is reasonable, which is especially suitable for precision instruments with strict operating-conditions and precision-lubrication. © Published under licence by IOP Publishing Ltd.

关键词： Permanent magnets

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Construction of ZnO@CDs@Co_(3)O_(4) sandwich heterostructure with multi-interfacial electron-transfer toward enhanced photocatalytic CO_(2) reduction

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Chinese Chemical Letters 2024年第4期35卷 147-152页

作者： Xiuzheng Deng Yi Ke Jiawen Ding Yingtang Zhou Hui Huang Qian Liang Zhenhui Kang Advanced Catalysis and Green Manufacturing Collaborative Innovation Center CNPC-CZU Innovation AllianceSchool of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316004China

Photocatalytic conversion of CO_(2) into small-molecule chemical feedstocks can meet the growing demand for energy and alleviate the global warming. Herein, a p-n ZnO@CDs@Co_(3)O_(4) heterojunction with sandwich structure was constructed by calcination method of self-assembled ZIF-8@CDs@ZIF-67. The ZnO@CDs@Co_(3)O_(4) with well-defined interfacial structure exhibited the significantly enhanced photocatalytic CO_(2) reduction activity, and the optimal catalyst indicated the(CO + CH_(4)) evolution rate of 214.53μmol g^(-1)h^(-1) under simulated solar light, which was superior to ZnO, Co_(3)O_(4) and binary ZnO@Co_(3)O_(4).The internal cavity, exposed active sites, multiple interfaces and constructed p-n heterojunction can facilitate the light harvesting and photoexcited electron transfer. Besides, after introduction of CDs placed in the middle layer between ZnO and Co_(3)O_(4), CDs with excellent photoelectric property further promoted charge separation and migration. This work represents an appealing strategy to construct well-defined photocatalysts for boosting CO_(2) photoreduction.

关键词： Metal-organic framework Photocatalytic CO_(2) reduction Carbon dots p-n heterojunction Sandwich heterostructure

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Constructing stable Li-solid electrolyte interphase to achieve dendrites-free solid-state battery:A nano-interlayer/Li prereduction strategy

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Nano Research 2022年第8期15卷 7180-7189页

作者： Yajun Niu Zhaozhe Yu Yongjian Zhou Jiawen Tang Maoxin Li Zechao Zhuang Yan Yang Xiao Huang Bingbing Tian Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology Guilin University of Electronic TechnologyGuilin 541004China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Department of Chemistry Tsinghua UniversityBeijing 100084China Collaborative Innovation Center for Vessel Pollution Monitoring and Control Dalian Maritime UniversityDalian 116026China

Solid-state batteries based on Li and nonflammable solid-state electrolytes(SSEs)have aroused the attention of numerous researchers because of their absolute safety and potentially high energy *** SSEs after coming into contact with Li are reduced,which leads to high interfacial charge-transfer impedance and dendrites *** this study,an“interlayer-Li pre-reduction strategy”was proposed to solve the above problem of *** intermediate layer was introduced between solid electrolyte and Li,and it reacted with Li to produce a stable and ion-conductive *** garnet-type Nb-doped Li_(7)La_(3)Zr_(2)O_(12)(Nb-LLZO)was selected as an example solid electrolyte since it is characterized by high ionic conductivity,feasible preparation under ambient conditions,as well as low *** high impedance arising from the reduction at the Nb-LLZO|Li interface has limited its *** this paper,a nano-scale Li phosphorus oxynitride(LiPON)layer was deposited on the Nb-LLZO pellets through radio frequency(RF)magnetron sputtering,which pre-reacted with Li in-situ to produce a lithiophilic,electronically insulating,and ionic conductive *** produced interphase significantly inhibited the reduction of Nb5+against Li and the formation and propagation of Li *** is noteworthy that Li|LiPON|Nb-LLZO|LiPON|Li cells stably cycled for over 2,000 h without any short *** study emphasizes and demonstrates the significance of the pre-conversion of modification layer between unstable SSE and Li metal to improve interfacial stability.

关键词： Nb-doped Li_(7)La_(3)Zr_(2)O_(12)(Nb-LLZO) conversion reaction Li phosphorus oxynitride(LiPON) interfacial reduction solid-state battery

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MorNet: Asymmetric UNet-like Network with Morphological Opening and Closing for Image Segmentation 17th

MorNet: Asymmetric UNet-like Network with Morphological Open...

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17th International Conference on Intelligent Robotics and Applications, ICIRA 2024

作者： Li, Meng Yun, Juntong Jiang, Du Tao, Bo Li, Gongfa Liu, Rong Liu, Ying Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and Technology Wuhan430081 China Research Center for Biomimetic Robot and Intelligent Measurement and Control 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 Research Institute Wuhan University of Science and Technology Wuhan430081 China School of Medicine Wuhan University of Science and Technology No. 1 Huangjia Lake University Town Wuhan430065 China School of Mechanical Engineering Hubei Engineering University Xiaogan432000 China

ISBN: (纸本)9789819607761

Image segmentation plays a crucial role in target recognition as it provides an essential prerequisite for identifying targets. However, UNet cannot acquire comprehensive information about the image, which limits its ability to effectively segment small and discrete objects. A new network structure, called MorNet, is proposed. It applies dilation and erosion operations in morphological opening and closing for connected and discrete region segmentation. MorNet effectively integrates global segmentation images, emphasizing small and discrete area segmentation and enhancing the segmentation of large continuous areas. This method enhances the understanding of the location of organs and diseased sites, enabling accurate segmentation. A side-out (SO) monitoring mechanism is introduced into the decoder to provide monitoring information for the original image and the predicted results. Compared with current UNet-like networks, our proposed method achieved the highest Dice scores (96.4635%, 94.0514%, 94.3444%) and PPV scores (94.2226%, 90.2361%, 91.5582%) for liver tumor, brain tumor, and liver segmentation tasks, respectively. The experimental results show that MorNet successfully combines the segmentation of connected and discrete regions. MorNet locates organs and lesions more accurately than current state-of-the-art medical image segmentation models. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Image segmentation

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Gate regulated near-infrared photodetector utilizing interlayer excitons for MoS2/CrPS4 heterojunction

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Science China(Information Sciences) 2024年第3期67卷 315-316页

作者： Guoliang XU Chao HE Donghong SHI Danmin LIU Wenjie DENG Jingzhen LI Xingtao AN Yongzhe ZHANG Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface College of ScienceHebei University of Science and Technology Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of Technology Key Laboratory of Optoelectronics Technology Ministry of EducationFaculty of Information TechnologyBeijing University of Technology

Excitons play an important role as interconnect in the optical and optoelectronic response and have attracted much attention for understanding the physical matters behind excitons [1, 2]. Excitons in atomically thin transition metal dichalcogenides semiconductors(TMDs) often trap an electron(X-) or a hole(X+) to form so-called trions,

关键词： Excitons

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Interfacial Heterogeneous Microstructure and Subsequent Machinability of 316L/CuSn10 Bimetallic Structure Manufactured by Laser Powder Bed Fusion

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Additive manufacturing Frontiers 2024年第3期3卷 100-112页

作者： Jie Chen Zhongpeng Zheng Di Wang Guijun Bi Yuchao Bai Institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangzhou510070China Guangdong Key Laboratory of Modern Control Technology Guangzhou510070China State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510640China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518052China

Additively manufactured bimetallic structures combine the advantages of dissimilar materials and can achieve localized properties through a customized composition ***,additively manufactured parts may still lack the dimensional accuracy and surface integrity essential for precision mechanical assemblies that the post-machining process can ***,this study aims to systematically investigate the microstructure and machinability of 316L/CuSn10 bimetallic structures fabricated using laser powder bed *** results show that the fusion zone of the bimetallic structure had refined grains of microscale size owing to the mixture of the primary elements of the bimetals,which resulted in the highest microhardness of 3.4 *** difference in microstructure and microhardness between the single-material and fusion zones also causes significant differences in the cutting response during the ultraprecision *** 316L stainless steel side exhibited the highest cutting force and more severe material accumulation in the *** cutting force drops when cutting through the fusion zone,with an observable fracture in the chips and separation of dissimilar materials on the machined grooves,indicating that the heterogeneous properties of additively manufactured 316L/CuSn10 bimetallic structures pose challenges to the improvement of surface *** simulation results also showed that stress accumulation occurred in the tool path through the fusion zone owing to the higher yield strength and hardness of stainless steel,indicating that lower cutting speeds and depths of cut are favorable for reducing cutting force and improving surface *** study provides deep insight into the microstructure evolution mechanism and a theoretical basis for improving the surface quality of additively manufactured bimetallic structures using an ultraprecision machining process.

关键词： Laser powder bed fusion Bimetallic structure Heterogeneous microstructures Ultra-precision machining Machinability

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