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System reliability and Safety engineering (SRSE), International Conference on

作者： Jianan Zhang Ying Chen Shumin Li Yingyi Li Science and Technology on Reliability and Environmental Engineering Laboratory Beihang University Beijing China Ship Development and Design Center China State Shipbuilding Corporation Limited Wuhan China

The development of SiP chips has driven the lightweight trend in electronics, but it also brings new reliability issues, especially package delamination caused by compound stress. This paper proposes a method for predicting the layered lifetime of SiP chip packaging based on physics-of-failure model. Taking an energy SiP module and its key components as an example, this paper analyzes the mechanism and influencing factors of package layering failure in different parts of SiP chip during reflow welding process and use. Through physics-of-failure model, the life of SiP chip in packaging layering process and reflow welding process is predicted. This research is of great significance for identifying weak points in SiP chip and the improvement of the design method.

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Hourglass nodal loop phonons in two dimensions jointly supported by fourfold rotation and glide mirror symmetries

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Physical Review B 2023年第4期108卷 045139-045139页

作者： Wei-Wang Yu Chenyang Wang Xiaoming Zhang Guodong Liu Junling Wang Zhimin Wu Ying Liu State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China Hebei Engineering Laboratory of Photoelectronic Functional Crystals School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China ATTL Advanced Materials Company Limited 10 Baozhong Road Tianbao Industrial Park Baodi District Tianjin 301899 China School of Physics and Electronic Engineering Chongqing Normal University Chongqing 401331 China

Hourglass nodal loops have garnered significant attention due to their unique band dispersion; yet their existence in two-dimensional (2D) solid materials has been scarcely studied, particularly in spinless phonon systems. While recent solutions have been proposed for spin systems, none have been proposed for spinless 2D phonon systems. In this paper, we perform a thorough search of all 80 layer groups (LGs) and identify only three LGs capable of hosting hourglass nodal loop phonons. Using symmetry analysis, we discover the minimum symmetry requirement for hourglass nodal loop phonons. In addition to a horizontal glide mirror and the time-reversal symmetry, which are necessary for spinful systems, the existence of hourglass nodal loops in 2D spinless systems requires a fourfold rotation symmetry, which differs from that in 2D spinful systems. With the presence of the fourfold rotation symmetry, 2D hourglass nodal loop phonons always appear with a quadratic Weyl point located at the center of this loop. Using first-principles calculations, we identify a realistic material that hosts the hourglass nodal loop to demonstrate our symmetry analysis. Furthermore, we demonstrate that the nodal loop can transform into a half-hourglass-like dispersion while still persisting when uniaxial strain is applied to break the fourfold rotation symmetry. Simultaneously, the quadratic nodal point splits into two linear Weyl points with opposite chirality. Our work highlights the differences between identifying hourglass nodal loops in spinless and spinful symmetry requirements and offers an effective approach to studying materials with hourglass nodal loops in spinless systems.

关键词： Density of states Edge states First-principles calculations Surface states Symmetry protected topological states Topological materials Topological phase transition Topological phases of matter

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A Highly Sensitive Stretchable Constraint Fiber Mat Sensor with Tailored Near-Zero Poisson's Ratio for Very Early Stage of Battery Over Charge/Overdischarge Monitoring

SSRN

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SSRN 2024年

作者： Liu, Guoqing Zhang, Yingying Li, Bo Guo, Shijie Yuan, Wenjing Meng, Chuizhou School of Materials Science & Engineering Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology Hebei University of Technology Tianjin300130 China State Key Laboratory for Reliability and Intelligence of Electrical Equipment Engineering Research Center of Ministry of Education for Intelligent Rehabilitation Device and Detection Technology Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction School of Mechanical Engineering Hebei University of Technology Tianjin300401 China

Battery state monitoring is crucial for safe operation and efficient management of lithium-ion battery (LIB) systems, but early stage of timely and accurate diagnosis remains challenging. Herein, we propose to utilize a highly sensitive stretchable strain sensor to in-situ monitor the slight strain variation of cells during charge and discharge, through which the state of the battery can be accurately reflected. The high sensing capability is realized by tailoring the Poisson’s ratio of low-modulus conductive fiber mats through a facile constraint manner. The non-uniform strain distribution together with the near-zero Poisson’s ratio synergistically result in superior sensing performance, including ultralow strain detection limit (0.006%), high strain sensitivity particularly under small strains (gauge factor of 116.1 between 0–2% strain), and high strain resolution under large deformations. When being practically utilized for LIB monitoring, the constraint fiber mat sensor can produce instant resistance response reflecting the cell capacity, and offer timely warning signal once the cell is overcharged or overdischarged. The developed stretchable strain sensor possesses comprehensive advantages of low modulus, tailorable small size, easy integration and conformality to cells, and little temperature interference, which would serve as a promising candidate for future battery state analysis and safety monitoring. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Progress of Materials science in Space technology in China(2020-2022)

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空间科学学报 2022年第4期42卷 812-823页

作者： WEI Qiang LIU Yue XIA Chaoqun Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology School of Materials Mechanical EngineeringHebei University of TechnologyTianjin300401 State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin300401 School of Materials Science and Engineering Hebei University of TechnologyTianjin300130

In this paper,the main research work and related reports of materials science research in China’s space technology field during 2020-2022 are *** paper covers Materials sciences in Space Environment,Materials sciences for Space Environment,Materials Behavior in Space Environment and Space experimental hardware for material *** the rapid development of China’s space industry,more scientists will be involved in materials science,space technology and earth science *** the future,a series of disciplines such as space science,machinery,artificial intelligence,digital twin and big data will be further integrated with materials science,and space materials will also usher in new development opportunities.

关键词： Materials sciences in space environment Materials sciences for space environment Materials behavior in space environment Space experimental hardware for material investigation

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Electromagnetically-induced-absorption-like ground state cooling in a hybrid optomechanical system

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Chinese Physics B 2025年第4期 423-432页

作者：董耀勇郑学军王登龙赵鹏 School of Electromechanical Engineering Guangdong University of Technology School of Mechanical Engineering and Mechanics Xiangtan University School of Physics and Optoelectronics Xiangtan University Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute

We present a scheme for the electromagnetically-induced-absorption(EIA)-like ground state cooling in a hybrid optomechanical system which is combined by two-level quantum systems(qubits) and a high-Q optomechanical cavity. Under the weak qubit-cavity coupling, the system exhibits an EIA-like effect and this effect is caused by quantum destructive interference that is distinct from the conventional EIA effect driven by quantum constructive interference. More importantly,the EIA-like cooling mechanism can significantly enhance the cooling rate of the hybrid system, enabling the final phonon number beyond the classical cooling limit in the strong optomechanical coupling regime. Meanwhile, the cooling effects of the EIA case is better than that of the normalmode splitting case under the same optomechanical coupling strength and qubit dissipation rate.

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Ultrathin and Highly-Stable Rubber Electrodes Based on Island-Bridge Multi-Filler Conductive Network for Multilayer-Stacked Dielectric Elastomer Artificial Muscles

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SSRN 2024年

作者： Yu, Wei Chen, Wenqiang Yuan, Wenjing Li, Guoxian Meng, Chuizhou Guo, Shijie State Key Laboratory for Reliability and Intelligence of Electrical Equipment Engineering Research Center of Ministry of Education for Intelligent Rehabilitation Device and Detection Technology Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction School of Mechanical Engineering Hebei University of Technology Tianjin300401 China School of Materials Science & Engineering Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology Hebei University of Technology Tianjin300130 China

Dielectric elastomer actuators (DEAs) have shown great promise in applications ranging from millimeter-sized haptic feedback to centimeter-scaled soft robots. However, past progress has been focused on the soft dielectric elastomers, and little attention has been paid to the compliant electrodes. Being stable to maintain conductive while enduring repeated large deformations and compliant to avoid stiffness increasing for the dielectric elastomer remains challenging. Moreover, the fabrication of multilayer DEAs is complex, hindering the practicality. Herein, an ultrathin (~500 nm) and highly stable acrylate rubber electrode based on unique island-bridge multi-filler conductive network is developed with outstanding electrical conductivity of 2.7 S cm-1, excellent stretchability of over 1200%, and superior cycling stability of 500,000 cycles at 30% uniaxial strain. An efficient stacking method based on conductive and dielectric layer co-stretching (CDCS) approach is proposed for assembling multilayer-stacked DEAs. The 5-layer DEA reaches a large actuation strain of >17% for lifting a heavy 1-kg load and can serve as biceps muscle to drive an artificial lower arm by a maximum rotation angle of 8°, demonstrating its potential in actuating humanoid robot in an essentially soft way. This conductive rubber electrode and CDCS method are promising for developing soft robotics and muscle-like actuators. © 2024, The Authors. All rights reserved.

关键词： Electrodes

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Percolation transition in temporal airport network

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Chinese Journal of Aeronautics 2020年第1期33卷 219-226页

作者： Shiyan LIU Zhenfu LI Jilong ZHONG Daqing LI College of Transportation Engineering Dalian Maritime UniversityDalian 116026China School of Reliability and Systems Engineering Beihang UniversityBeijing 100083China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing 100083China Equipment Management and UVA Engineering College Air Force Engineering UniversityXi’an 710051China

The air transportation system has a critical impact on the global *** the system reliability is essential for the operational management of air traffic,it remains challenging to understand the network reliability of the air transportation *** paper focuses on how the global air traffic is integrated from local scale along with operational *** integration process of air traffic into a temporally connected network is viewed as percolation process by increasing the integration time *** critical integration time TPwhich is found during the integration process can measure the global reliability of air *** critical links at TPare also identified,the delay of which will influence the global integration of the airport *** findings may provide insights on the reliability management for the temporal airport network.

关键词： Air traffic Critical links Percolation reliability Temporal airport network

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Detection methods of surface defects of sintering material based on machine vision

Detection methods of surface defects of sintering material b...

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Fully Actuated System Theory and Applications (CFASTA), Conference on

作者： Wensi Liu Xiao-Yu Tang Yi Yang Liang Zhao Chunjie Yang State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou China School of Reliability and Systems Engineering Beihang University Beijing China School of Software Technology Dalian University of Technology Dalian China

The iron and steel industry is one of the pillar industries in the national economy. Blast furnace (BF) ironmaking is the core step in long-process ironmaking. Before BF production, to improve the ore quality, sintering is adopted to provide high-quality man-made ore from raw materials. In the sintering process, the material surface state is the main indicator for monitoring the ignition effect. During the actual production process, due to the influence of the ingredients and the ignition effect, there are defects on the sintering material surface, including yellow mud, mouse holes, and cracks. Detection of defect information on the material surface is conducive to ensuring the stable quality of the sinter and the stable operation of sintering production. This paper designs the corresponding detection methods for the three defects based on machine vision algorithms, 1) Yellow mud detection: separate the material surface area of the sintering trolley by semantic segmentation, and judge whether there is yellow mud according to the HSV histogram correlation combined with the shape judgment condition of yellow mud; 2) Mouse hole detection: use the target detection method of YOLOv5 without Mosaic detects mouse holes and improves the detection ability of small targets; 3) Crack detection: transfer learning and improved DeepLabv3+ network semantic segmentation are used for crack detection to improve the accuracy of crack detection. Finally, all methods are applied to the actual production line, and the detection accuracy and effectiveness of the above methods are verified through image testing and calculation of evaluation indicators, which can meet the needs of on-site use.

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Advanced insulating materials contributing to“carbon neutrality”:Opportunities,issues and challenges

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High Voltage 2022年第4期7卷 607-609页

作者： Chuanyang Li Yunlong Zi Yang Cao Giovanni Mazzanti Davide Fabiani Di Zhang Yunqi Xing Jinliang He State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing100084China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong Kong SARChina Electrical and Computer Engineering University of Connecticut371 Fairfield WayStorrsCT 06269USA Department Electrical Electronic and Information EngineeringUniversity of BolognaBologna 40136Italy Electrical and Computer Engineering Department Naval Postgraduate School1 University CircleMontereyCA 93943USA State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin300131China

The vision of 2050 worldwide carbon-neutral ignites a revo-lution in all *** innovations in both electrical power equipment and electrified transportation assets are shaping our future energy *** materials,as the core element of energy infrastructure,are facing unprece-dented challenges that stand in the pathways to global carbon ***,researchers from both academic in-stitutions and industrial sections are working to turn the challenges into opportunities.

关键词： structure. neutral carbon

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A Novel Tetrahexcarbon as a High-Performance Anode Material for Na-Ion and K-Ion Batteries

SSRN

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SSRN 2023年

作者： Ma, Shihao Zhang, Hui Cheng, Zishuang Xie, Xinjian Zhang, Xiaoming Liu, Guodong Chen, Guifeng State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300130 China School of Materials Science and Engineering Hebei University of Technology Tianjin300130 China Hebei Engineering Laboratory of Photoelectronic Functional Crystals Hebei University of Technology Tianjin300130 China

The search for high storage capacity anode materials has been an important topic in the field of ion batteries. With the gradual development of two-dimensional (2D) materials, their potential as high-performance electrode materials have been demonstrated. Here, using first principles calculations, we investigate the feasibility of novel Tetrahexcarbon as a high-performance anode material for Na/K ion batteries. Our results indicate that Na/K ions can be chemically and stably adsorbed on the surface of Tetrahexcarbon. It is noteworthy that the Na capacity of Tetrahexcarbon is up to 2233.3 mAh g-1 and the K capacity up to 744.4 mAh g-1 with a guaranteed low diffusion barrier (0.14 eV for Na;0.18 eV for K). Therefore, our calculations show that Tetrahexcarbon is an excellent anode material with great potential for ultra-high energy storage devices. © 2023, The Authors. All rights reserved.

关键词： Diffusion barriers

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