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arXiv 2023年

作者： Zhu, Fengfeng Hua, Chenqiang Wang, Xiao Miao, Lin Su, Yixi Hashimoto, Makoto Lu, Donghui Shen, Zhi-Xun Jia, Jin-Feng Lu, Yunhao Guan, Dandan Qian, Dong School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Information Functional Materials Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 2020 X-Lab Shanghai200050 China Forschungszentrum Jülich Lichtenbergstrasse 1 GarchingD-85747 Germany School of Physics Zhejiang University Hangzhou310027 China Zhongfa Aviation Institute of Beihang University Hangzhou310023 China School of Physics Southeast University Nanjing211189 China Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Geballe Laboratory for Advanced Materials Department of Physics and Applied Physics Stanford University StanfordCA94305 United States Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai200240 China Hefei National Laboratory Hefei230088 China Shanghai Research Center for Quantum Sciences 99 Xiupu Road Shanghai201315 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

A two-dimensional quantum spin Hall insulator exhibits one-dimensional gapless spin-filtered edge channels allowing for dissipationless transport of charge and spin. However, the sophisticated fabrication requirement of two-dimensional materials and the low capacity of one-dimensional channels hinder the broadening applications. We introduce a method to manipulate a three-dimensional topological material to host a large number of one-dimensional topological edge channels utilizing surface anisotropy. Taking ZrTe5 as a model system, we realize a highly anisotropic surface due to the synergistic effect of the lattice geometry and Coulomb interaction, and achieve massive one-dimensional topological edge channels - confirmed by electronic characterization using angle-resolved photoemission spectroscopy, in combination with first-principles calculations. Our work provides a new avenue to engineer the topological properties of three-dimensional materials through nanoscale tunning of surface morphology and opens up a promising prospect for the development of low-power-consumption electronic nano devices based on one-dimensional topological edge channels. © 2023, CC BY.

关键词： Anisotropy

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Precise Synthesis of Dual-Single-Atom Electrocatalysts through Pre-Coordination-Directed in Situ Confinement for CO2Reduction

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Angewandte Chemie 2024年第3期137卷

作者： Peng Rao Xingqi Han Haochen Sun Fangyuan Wang Ying Liang Jing Li Daoxiong Wu Xiaodong Shi Zhenye Kang Zhengpei Miao Peilin Deng Xinlong Tian School of Marine Science and Engineering Hainan University Haikou 570228 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension Materials/Innovation Center for Textile Science and Technology/Institute of Functional Materials/Center for Civil Aviation Composites College of Materials Science and Engineering Donghua University Shanghai 201620 China

Dual-single-atom catalysts (DSACs) are the next paradigm shift in single-atom catalysts because of the enhanced performance brought about by the synergistic effects between adjacent bimetallic pairs. However, there are few methods for synthesizing DSACs with precise bimetallic structures. Herein, a pre-coordination strategy is proposed to precisely synthesize a library of DSACs. This strategy ensures the selective and effective coordination of two metals via phthalocyanines with specific coordination sites, such as −F− and −OH−. Subsequently, in situ confinement inhibits the migration of metal pairs during high-temperature pyrolysis, and obtains the DSACs with precisely constructed metal pairs. Despite changing synthetic parameters, including transition metal centers, metal pairs, and spatial geometry, the products exhibit similar atomic metal pairs dispersion properties, demonstrating the universality of the strategy. The pre-coordination strategy synthesized DSACs shows significant CO 2 reduction reaction performance in both flow-cell and practical rechargeable Zn-CO 2 batteries. This work not only provides new insights into the precise synthesis of DSACs, but also offers guidelines for the accelerated discovery of efficient catalysts.

关键词： Dual-single-atom catalysts bimetallic pairs pre-coordination strategy CO2 reduction reaction synergistic effects

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Microstructures and mechanical properties of friction stir welds on 9% Cr reduced activation ferritic/martensitic steel

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Journal of Materials Science & technology 2018年第5期34卷 756-766页

作者： Chao Zhang Lei Cui Yongchang Liu Chenxi Liu Huijun Li State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science & EngineeringTianjin University Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin University

In this study,the microstructures and mechanical properties of 9%Cr reduced activation ferritic/martensitic（RAFM） steel friction stir welded joints were *** a W-Re tool is used,the recommended welding parameters are 300 rpm rotational speed,60 mm/min welding speed and10 kn axial *** stir zone（SZ）,austenite dynamic recrystallization induced by plastic deformation and the high cooling rates lead to an obvious refinement of prior austenite grains and martensite *** microstructure in SZ contains lath martensite with high dislocation density,a lot of nano-sized MX and M3C phase particles,but almost no M23C6 *** thermal mechanically affect zone（TMAZ）and heat affect zone（HAZ）,refinement of prior austenite and martensitic laths and partial dissolution of M（23）C6 precipitates are obtained at relatively low rotational ***,with the increase of heat input,coarsening of martensitic laths,prior austenite grains,and complete dissolution of M23C6 precipitates are *** toughness of SZ at-20℃ is slightly lower than that of base material（BM）,and exhibits a decreasing trend with the increase of rotational speed.

关键词： Friction stir welding Reduced activation ferritic/martensitic steel Microstructure evolution Impact toughness

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Fast prediction of viscoelastic behavior of 3D tubular braided composites based on deep learning

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Composite Structures 2025年

作者： Yuyang Zhang Huimin Li Baosheng Liu Ruishen Lou Yulin Wang Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing Institute of Technology Beijing 100081 China Beijing Spacecrafts China Academy of Space Technology Beijing 100094 China CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China China North Vehicle Research Institute Beijing 100072 China

Rapidly and accurately calculating the macroscopic viscoelastic properties of three-dimensional (3D) tubular braided composites is of great practical significance for their structural design and optimization. This study proposes a data-driven approach combined with trans -scale modeling to predict the axial compressive viscoelastic properties of 3D tubular braided composites. First, the viscoelastic constitutive relations for the matrix and the yarn are established, and the trans -scale finite element model of the 3D tubular braided composites is constructed based on micro-CT technology to calculate the viscoelastic curves and perform experimental validation. Then, a deep neural network (DNN) model integrated with an automatic hyperparameter optimization algorithm is built to train and test the simulation dataset generated by the finite element model, and finally the axial compression relaxation modulus curves of 3D tubular braided composites with different parameters (braiding angle, fiber eccentricity, inter-yarn porosity, intra-yarn porosity, temperature, total fiber volume fraction and fiber elastic modulus) are predicted. The results show that the developed data-driven model based on finite element and deep learning can quickly and accurately predict the macroscopic viscoelastic properties of 3D tubular braided composites.

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A Model Based Heterogeneous Data Collaboration Method

A Model Based Heterogeneous Data Collaboration Method

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IEEE International Conference on Electronics and Communication Engineering (ICECE)

作者： Junjie Xue Junhua Zhou Guoqiang Shi Yanhong Jiang Bowen Wei Hongyan Quan Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing China Beijing Simulation Center Science and Technology on Space System Simulation Laboratory Beijing China School of Software Engineering East China Normal University Shanghai China School of Computer Science and Technology East China Normal University Shanghai China

ISBN: (数字)9781728192581

ISBN: (纸本)9781728192598

Model based heterogeneous data collaboration is important in the integrated design and manufacturing technology. In this work, we propose a systematic method of collaborative design method for heterogeneous data sources. In our method, we use the Open Model Based Engineering Environment (OpenMBEE) to study. In our work, we setup environment and construct the integrated multi-tools achieving consistency design, and then we successfully design and implement a reasonable scheme to parameterize the model in requirement analysis and store the extracted parameters in Model Management System (MMS) for transporting to the visualization tool for further simulation. We integrate the mathematical analysis tools of MATLAB, and successfully design the interface in the tool integration, and realize the model consistency in the problem of integrating multiple tools in the design based on model center. The effectiveness of the proposed integration strategies is verified by some practical instances. That is verified that our provided study can an effective design idea for complex production.

关键词： Analytical models Collaboration Production Tools Data models Mathematical model Matlab

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Finite element simulation and experimental test of the wear behavior for self-lubricating spherical plain bearings

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Friction 2018年第3期6卷 297-306页

作者： Yahong XUE Jigang CHEN Sumin GUO Qingliang MENG Junting LUO School of Mechanical Engineering Yanshan University Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan University Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University

In this study, based on the classical Archard adhesion wear theory, a three-dimensional finite element model was established, with the aim of simulating the failure process of self-lubricating spherical plain bearings in the swinging wear condition. The results show that the self-lubricating spherical plain bearings go through two different stages during the wear process, namely, initial wear stage and stable wear stage. Because the large contact points wear out during the initial wear stage, the maximum contact pressure decreases as the test period increases. The relatively larger wear depth region shows elliptical distribution, and the maximum distribution appears in the central contact area. The wear depth reaches 0.974 mm after swinging 25,000 times. PTFE fibers, which possess a good friction performance but poor abrasion resistance, abundantly exist on the friction surfaces of the fabric liner. Consequently, the friction torque during the initial wear stage is slightly smaller than the friction torque during the stable wear stage; however, the wear rate during the initial wear stage is high. The reliability and effectiveness of the finite element model are verified by experiment. The developed finite element model can be used for the analysis of the wear mechanisms of bearings and the prediction of the service life of bearings.

关键词： spherical plain bearing wear mechanisms wear depth contact pressure simulation

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Interfacial strength vs toughness: Enhancing mechanical and impact performance of CF/PEEK thermoplastic composites

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Chemical Engineering Journal 2025年 518卷

作者： Yu Gao Song Yan Kaiyan Min Xiahui Liu Yue Li Ju Wu Jianfeng Zhou Shu Zhu Peng Wang State Key Laboratory of Advanced Fiber Materials (Donghua University) Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint) Center for Civil Aviation Composites College of Materials Science and Engineering Donghua University Shanghai 201620 China Key Laboratory of Shanghai City for Lightweight Composites Key Laboratory of High-Performance Fibers & Products Ministry of Education Donghua University Shanghai 201620 China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science BIC-ESAT College of Engineering Peking University Beijing 100871 China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules Shanghai Jiao Tong University Shanghai 201306 China Key Laboratory of Textile Science & Technology of Ministry of Education College of Textiles Donghua University Shanghai 201620 China

Carbon fiber reinforced thermoplastic composites (CFRTP) are highly recyclable, reducing waste and promoting sustainability in industrial applications. Good interfacial adhesion is key to the mechanical performance of CFRTPs. Despite its critical role in impact resistance and durability, interfacial toughness has received less attention than interfacial strength, which has been more widely studied and discussed. In this study, Carbon fiber fabrics were treated with two modifiers of different stiffness: polyimide (M1) and poly(arylsulfone) (M2). Composites containing varying concentrations of these modifiers were then fabricated via compression molding. The influence of modifier stiffness on the mechanical properties and fracture toughness of the composites was systematically analyzed. Compared to untreated fibers, the composites modified with an optimal concentration of M1 achieved tensile strength, flexural strength, and interlaminar shear strength (ILSS) improvements of 24.9 %, 20.5 %, and 27.8 %, respectively, while the M2 modified composites exhibited respective increases of 43.8 %, 19.3 %, and 28.3 %. Analysis of impact damage morphology and C-scan imaging revealed that composites modified with 2 wt% M1 and 1 wt% M2 exhibited reduced internal damage areas. The rigid -C=O-N structure of M1 led to brittle fracture, while the flexible long chains of M2 facilitated stress transfer and energy absorption, resulting in ductile fracture. Their compression-after-impact (CAI) failure modes were characterized by transverse cracking along the central defect. These findings provide valuable theoretical guidance for enhancing the toughness of thermoplastic composites through interfacial treatment.

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Stability analysis for Takagi-Sugeno fuzzy systems with a periodically varying delay via a generalized allowable delay set partitioning approach

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Fuzzy Sets and Systems 2025年 518卷

作者： Yun Chen Xin Wang Yaqi Li Yunfei Qiu Shuangcheng Sun School of Transportation and Electrical Engineering Hunan University of Technology Zhuzhou 412007 China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang 110819 China School of Artificial Intelligence and State Key Laboratory of Disaster Prevention & Reduction for Power Grid Changsha University of Science and Technology Changsha 410114 China Department of Electrical Engineering Hunan Aviation Technical College Zhuzhou 412006 China National Innovation Center of Advanced Rail Transit Equipment Zhuzhou 412001 China School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China

Recently, researchers have employed a monotone-delay-interval-based Lyapunov-Krasovskii functional (LKF) to investigate the delay-dependent stability of Takagi-Sugeno (T-S) fuzzy systems with a periodically varying delay. However, this method is limited by its looped LKF structure and seems to ignore the benefits of partitioning the allowable delay set. To address this gap, a generalized allowable delay set partitioning approach is introduced, leveraging the definition of the allowable delay set and a region partitioning scheme, to analyze the stability of T-S fuzzy systems with a periodically varying delay. Our approach allows the construction of different LKFs in various partition sets. This flexibility, compared to existing methods, relaxes the structure of LKF construction and enhances the utilization of system state and delay function information. Subsequently, stability criteria, which exhibit a hierarchy, for T-S fuzzy systems with a periodically varying delay are derived. Finally, the efficacy and superiority of the proposed stability criteria are confirmed through two numerical examples and a practical truck-trailer system.

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Vibration characteristic of metallic thin-walled structures under high temperature and high intensity noise 26

Vibration characteristic of metallic thin-walled structures ...

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26th International Congress on Sound and Vibration, ICSV 2019

作者： Zhao, Fengtong Sha, Yundong Luan, Xiaochi Luo, Li Liaoning Province Key Laboratory of Advanced Measurement And Test Technology of Aviation Propulsion Systems Shenyang Aerospace University Shenyang Liaoning110136 China School of Energy and Power Engineering Beihang University Beijing100191 China

ISBN: (纸本)9781999181000

Thin-walled structures of aeroengine are under the ever growing threats from the combined excitation of elevated thermal load and high level acoustic load which can reach 1500°F in temperature and 170dB in sound pressure level. The consequent large amplitude nonlinear responses reduce the fatigue life of structures greatly. An acoustic experiment on a turbofan aeroengine is firstly implemented to investigate noise characteristic in the combustion chamber. The noise signal under several adjustment status of the engine is obtained which served as the acoustic load in the numerical calculation. The coupled Finite Element Method and Boundary Element Method (FEM/BEM) is used to calculate dynamic responses of metallic thin-wall rectangular plate with four edges clamped. The influence of progressive wave acoustic field and the effects of temperature rising on the vibration response of thin-walled structures are discussed. Time-domain stress results under different thermal-acoustic loads are extracted. The characteristics of thermal-buckling and snap-through of structures are analyzed. And at a special buckling coefficient, stress response of the structure shows intermittent snap-though motion. The calculation method and analysis results obtained in this paper can contribute greatly to the thorough understanding of thermal-acoustic response characteristics of thin-walled structures and the anti-acoustic fatigue design in aeroengine © Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019. All rights reserved.

关键词： Thin walled structures

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Correction to: Multi-step inertial Krasnosel’skiǐ–Mann iteration with new inertial parameters arrays

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Journal of Fixed Point Theory and Applications 2021年第4期23卷 1-4页

作者： Dong, Qiao-Li Li, Xiao-Huan Cho, Yeol Je Rassias, Themistocles M. Tianjin Key Laboratory for Advanced Signal Processing and College of Science Civil Aviation University of China Tianjin People’s Republic of China School of Mathematics and Statistics Shandong University of Technology Shandong People’s Republic of China Department of Mathematics Education Gyeongsang National University Jinju Korea Center for General Education China Medical University Taichung Taiwan Department of Mathematics National Technical University of Athens Athens Greece

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