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Double dual-nodal-line semimetals with large surface density of states: Topological quantum catalysts for the hydrogen-evolution reaction

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Physical Review Applied 2023年第4期20卷 044042-044042页

作者： Xiaotian Wang Lirong Wang Chengwu Xie Ying Liu Guodong Liu Wenhong Wang Zhenxiang Cheng Gang Zhang Xiaoming Zhang School of Physical Science and Technology Southwest University Chongqing 400715 China Institute for Superconducting and Electronic Materials (ISEM) University of Wollongong Wollongong 2500 Australia State Key Laboratory of Reliability and Intelligence of Electrical Equipment and School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China School of Electronics & Information Engineering Tiangong University Tianjin 300387 China Institute of High-Performance Computing Agency for Science Technology and Research (A*STAR) 138632 Singapore

Topological quantum catalysts are developing rapidly due to the emergence of exotic quantum materials and their corresponding catalytic performance. Although tens of thousands of topological semimetals have been developed, their low topological surface density of states (DOSs) remains a hindrance to the development of high-performance catalysts for electrochemical hydrogen evolution reactions (HERs). In this work, we investigate the potential of double dual-nodal line (DDNL) semimetals, which exhibit large surface DOSs and fair-low Gibbs free energies, as ideal topological quantum catalysts (TQCs) for HER. Using the NaAlGe compound as a representative example, we demonstrate that its DDNLs and high surface DOSs around the Fermi level provide advantages for achieving exceptionally high catalytic activity in the electrochemical HER process. Through a comparison of catalytic performance under different (electron and hole) doping and uniaxial strain conditions, we establish a linear correlation between the Gibbs free energy (ΔGH∗) and the projected surface DOSs on the (001) semi-infinite surface of the DDNL semimetal NaAlGe, specifically for the hydrogen evolution process. Our work introduces an alternative category of high-performance TQCs free of noble metals and contributes to a better understanding of the relationship between catalytic performance for HER and surface DOSs in DDNL semimetals.

关键词： Energy materials Hydrogen energy Hydrogen production Topological materials Density functional theory

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Controllable Synthesis of an Efficient and Stable Electrocatalyst Based on Hybrid Mesoporous Sheets-Like Bimetallic Sulfide @ P, N-Doped Carbon for Alkaline Oxygen Evolution Reaction

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SSRN 2024年

作者： Gomaa, Hassanien An, Cuihua Jiao, Penggang Wu, Wenliu Alzahrani, Hassan A.H. Shenashen, Mohamed A. Deng, Qibo Hu, Ning Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of Education School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Department of Chemistry Faculty of Science Al-Azhar University Assiut71524 Egypt Islamic Science University of Malaysia Malaysia State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of Technology Tianjin300401 China

Due to the high cost of precious metal catalysts for oxygen evolution reaction (OER), producing outstandingly efficient electrocatalysts with low affordability is significant for generating pollution-free and renewable energy via electrochemical processes. Herein, a facile hydrothermal approach is employed to synthesize a hybrid mesoporous iron-nickel bimetallic sulfides @ P,N-doped carbon for OER. The as-prepared Fe0.5NiS2@C exhibited overpotentials (η) of 250 mV at 10 mA/cm2, which exceeded those that were recently reported using surface-modified P, N-doped carbon-based catalysts for OER in 1M KOH medium. Moreover, the Fe0.5NiS2@C catalyst showed a notable Tafel slope of 90.5 mV/dec with long-dated stability even after 24 h at 10 mA/cm2. The superior OER performance of Fe0.5NiS2@C catalysts may be due to the enormous surface area, sheets-like morphology with abundant active sites, fast transfer of mass and electrons, control of electronic structure by co-treatment with heteroatoms (e.g., P and N), and synergistic effect of bimetallic sulfides, making it a favorable catalyst for oxygen evolution reaction. The density functional theory (DFT) displays that the Fe0.5NiS2@C catalyst exhibits strong H2O-adsorption energy. This result could be one of the explanations explaining the high catalytic activity. © 2024, The Authors. All rights reserved.

关键词： Electrocatalysts

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reliability Analysis and Health Management of the Radar Range Based on Belief reliability Theory

Reliability Analysis and Health Management of the Radar Rang...

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

作者： Wu Jipeng Zhang Qingyuan Zheng Yuanzhu Song Xiaomei Nanjing Research Institute of Electronics Technology Nanjing China School of Aeronautic Science and Engineering The Key Laboratory on Reliability and Environmental Engineering Technology Beihang University Beijing China

As one of the core equipment in modern joint operations, the demand for the radar reliability and health management is getting higher recently. Current studies of the radar reliability analysis and health management usually depend on probability theory and cannot be related to the radar design directly. These studies only consider an individual range evaluation rather than all evaluations under the same condition and ignore epistemic uncertainties. Aiming at these problems, we firstly propose a belief reliability modeling methodology of the radar range based on belief reliability theory and uncertainty theory, which directly builds up the relationship between the radar range and the reliability evaluation and quantifies epistemic uncertainties properly. This study can also provide support for the radar health management. A simulation case is used to illustrate the proposed methodology. Results show that the proposed methodology is suitable for the uncertainty quantification of the radar range and can help decision makers to make appropriate maintenance decisions.

关键词： Degradation Uncertainty Radar measurements Radar reliability theory Maintenance engineering reliability engineering

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Region-based Flash Caching with Joint Latency and Lifetime Optimization in Hybrid SMR Storage Systems

Region-based Flash Caching with Joint Latency and Lifetime O...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Zhengang Chen Guohui Wang Zhiping Shi Yong Guan Tianyu Wang College of Information Engineering Capital Normal University Beijing China Beijing Key Laboratory of Electronic System Reliability Technology Capital Normal University Beijing China International Science and Technology Cooperation Base of Electronic System Reliability and Mathematical Interdisciplinary Capital Normal University Beijing China Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong China

The frequent Read-Modify-Write operations (RMWs) in Shingled Magnetic Recording (SMR) disks severely degrade the random write performance of the system. Although the adoption of persistent cache (PC) and built-in NAND flash cache alleviates some of the RMWs, when the cache is full, the triggered write-back operations still prolong I/O response time and the erasure of NAND flash also sacrifices its lifetime. In this paper, we propose a Region-based Co-optimized strategy named Multi-Regional Collaborative Management (MCM) to optimize the average response time by separately managing sequential/random and hot/cold data and extend the NAND flash lifetime by a region-aware wear-leveling strategy. The experimental results show that our MCM reduces 71 % of the average response time and 96% of RMWs on average compared with the Skylight (baseline). For the comparison with the state-of-art flash-based cache (FC) approach, we can still save the average response time and flash erase operations by 17.2 % and 33.32 %, respectively.

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聚氨酯海绵中碳纳米管与各向异性形状Ni的协同效应增强电磁干扰屏蔽性能

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science China Materials 2023年第7期66卷 2803-2811页

作者：程浩然潘亚敏王铁成周洋秦怡静刘春太申长雨刘宪虎 College of Materials Science and Engineering National Engineering Research Center for Advanced Polymer Processing TechnologyKey Laboratory of Advanced Material Processing&Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450002China Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058ErlangenGermany Center for Engineering Materials and Reliability Guangzhou HKUST Fok Ying Tung Research InstituteGuangzhou 511458China

巧妙的微观结构设计和合适的多组分策略仍然是高效吸收型电磁干扰屏蔽材料在轻质、低填充水平和薄样品厚度方面的挑战.本文基于独特的屏蔽胶囊结构,采用浸渍法制备了柔性水性聚氨酯/介电碳纳米管/磁各向异性镍(链或花)电磁屏蔽复合海绵... 详细信息

巧妙的微观结构设计和合适的多组分策略仍然是高效吸收型电磁干扰屏蔽材料在轻质、低填充水平和薄样品厚度方面的挑战.本文基于独特的屏蔽胶囊结构,采用浸渍法制备了柔性水性聚氨酯/介电碳纳米管/磁各向异性镍(链或花)电磁屏蔽复合海绵.结果表明,增加镍(花状或链状)填料的含量可显著提高复合材料的导电性和电磁干扰屏蔽性能.水性聚氨酯/碳纳米管/8 wt%镍花-三聚氰胺海绵和水性聚氨酯/碳纳米管/8 wt%镍链-三聚氰胺海绵的电磁屏蔽性能分别为42.8和46.7 dB,优于仅含碳纳米管的复合海绵.碳纳米管与镍(花状或链状)之间的协同作用意味着复合海绵的屏蔽电磁干扰的主要机制来自于吸收过程.重要的是,在水性聚氨酯层的保护下,复合材料在强烈的物理和化学损伤下仍然表现出良好的电磁屏蔽性能.这项工作为设计新颖、轻量化和高效的电磁屏蔽复合材料提供了一种简单的协同策略,在便携式和可穿戴电子设备中显示出巨大的应用前景.

关键词： carbon nanotubes anisotropy-shaped Ni polymer-matrix composites electrical properties electromagnetic interference shielding

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Multifunctional Eutectic Hydrogel: Revolutionizing Stability, Sensitivity, and Versatility in Ionic Skin Devices

SSRN

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SSRN 2024年

作者： Wen, Jie Zhang, Yu Ning, Huiming Huang, Kaiyan Zhao, Libin Zhang, Lidan Xiang, Chenxing Wu, Xiaopeng Lee, Alamisi Fan, Ting Hu, Ning State Key Laboratory of Reliability and Intelligence Electrical Equipment Key Laboratory of Advanced Intelligent Protective Equipment Technology Ministry of Education School of Mechanical Engineering Hebei University of Technology Tianjin300401 China College of Aerospace Engineering Chongqing University Chongqing400044 China Chongqing University China School of Manufacturing Science and Engineering Southwest University of Science and Technology Mianyang621010 China Center for Medical Epigenetics School of Basic Medicine Chongqing Medical University Chongqing400042 China

Hydrogel-based and eutectic gel-based ionic skins have received considerable attention in the fields of flexible sensors and healthcare. However, the inherent tendency of hydrogels to undergo rapid dehydration and the propensity of eutectic gels to exhibit excessive hygroscopicity render these materials vulnerable to instability when exposed to air, thereby negatively affecting their morphology and conductive properties. Herein, we propose a novel multifunctional eutectic hydrogel-based ionic skin that demonstrates remarkable stability and sensing capabilities. By maintaining a dynamic balance between hydration and dehydration within the system architecture, it exhibits outstanding stability, retaining over 99% of its weight even after a prolonged two-month period. Notably, when utilized as a strain sensor, it achieves a maximum gauge factor of 22.62, corresponding to an impressive 540% strain detection range. Furthermore, this material displays self-adhesion, self-repair capability, transparency, ultraviolet resistance, freezing resistance and biocompatibility. When applied in human motion monitoring, this material accurately captures large strain and micro motion, while also facilitating speech recognition. Moreover, when utilized as a physiological electrode, the material effectively identifies electrocardiogram (ECG) signals during long-term wear or exercise. Overall, the multifunctional eutectic hydrogel introduces novel perspectives for the design of innovative ionic skin with enhanced stability and versatility. © 2024, The Authors. All rights reserved.

关键词： Stability

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Research on the Calculation Method of Arc Sag in Overhead Transmission Lines under Wildfire Conditions

Research on the Calculation Method of Arc Sag in Overhead Tr...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Ruikang Ma You Zhou Yangzhuojun Zhou Enze Zhou Lei Wang Hao Wang Key Laboratory of Grid Disaster Prevention and Mitigation School of Electrical and Information Engineering Changsha University of Science and Technology Changsha China Guangdong Electric Power Equipment Reliability Enterprise Key Laboratory Electric Power Research Institute of Guangdong Power Grid Co Guangdong China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

When wildfires occur under overhead power lines, the high temperatures caused by the fire increase the sag of the lines, decreasing the safe distance between the lines and the ground, and increasing the likelihood of power line trips due to wildfires. Existing methods for calculating line sag under wildfire conditions consider too few factors, making it difficult to accurately assess the degree of line sag under wildfire conditions. Based on the theory of fire burning zone division, this paper establishes a multi-physical field heat transfer model for wildfires, calculates and studies the effects of wildfire burning area, burning temperature, height above the ground, and horizontal distance from the center of wildfire burning on the spatial temperature distribution, and constructs a wildfire temperature distribution function model. Finally, combining the wildfire temperature distribution function with the principles of mass conservation and isothermal expansion, a method for calculating line sag is proposed. Taking a span of 200 meters as an example, the influence of the line's distance from the center of wildfire burning, height above the ground, temperature at the base of the fire, and burning area on the maximum sag of the line is analyzed. The results show that when wildfires occur directly under transmission lines and burn intensely, the higher the burning temperature and the larger the burning area, the lower the line height, the corresponding high temperatures will significantly increase the maximum sag of the line, reducing the ground clearance of the line. Even at distances more than 100 meters from the center of the wildfire, the high temperatures can also slightly increase the line sag.

关键词： Meters Temperature distribution Wildfires Power transmission lines Simulation Fitting System integration Land surface temperature Isothermal processes Heat transfer

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Landing scheduling for carrier aircraft fleet considering bolting probability and aerial refueling

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Defence technology 2025年

作者： Zhang, Genlai Wang, Lei Deng, Zhilong Liu, Xuanbo Su, Xichao Li, Haixu Lu, Chen Liu, Kai Wang, Xinwei School of Mathematical Science Dalian University of Technology Dalian116024 China Department of Engineering Mechanics State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment Dalian University of Technology Dalian116024 China Naval Aviation University Yantai264001 China China State Shipbuilding Corporation Systems Engineering Research Institute Beijing100094 China Department of Automation School of Information Science and Technology Tsinghua University Beijing100084 China School of Reliability and Systems Engineering Beihang University Beijing100191 China Institute of Reliability Engineering Beihang University Beijing100191 China Hangzhou International Innovation Institute Beihang University Hangzhou311100 China School of Aeronautics and Astronautics Dalian University of Technology Dalian116024 China

Recovery is a crucial supporting process for carrier aircraft, where a reasonable landing scheduling is expected to guide the fleet landing safely and quickly. Currently, there is little research on this topic, and most of it neglects potential influence factors, leaving the corresponding supporting efficiency questionable. In this paper, we study the landing scheduling problem for carrier aircraft considering the effects of bolting and aerial refueling. Based on the analysis of recovery mode involving the above factors, two types of primary constraints (i.e., fuel constraint and wake interval constraint) are first described. Then, taking the landing sequencing as decision variables, a combinatorial optimization model with a compound objective function is formulated. Aiming at an efficient solution, an improved firefly algorithm is designed by integrating multiple evolutionary operators. In addition, a dynamic replanning mechanism is introduced to deal with special situations (i.e., the occurrence of bolting and fuel shortage), where the high efficiency of the designed algorithm facilitates the online scheduling adjustment within seconds. Finally, numerical simulations with sufficient and insufficient fuel cases are both carried out, highlighting the necessity to consider bolting and aerial refueling during the planning procedure. Simulation results reveal that a higher bolting probability, as well as extra aerial refueling operations caused by fuel shortage, will lead to longer recovery complete time. Meanwhile, due to the strong optimum-seeking capability and solution efficiency of the improved algorithm, adaptive scheduling can be generated within milliseconds to deal with special situations, significantly improving the safety and efficiency of the recovery process. An animation is accessible at ***/video/BV1QprKY2EwD. © 2025 China Ordnance Society

关键词： Air refueling

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Defects Clustering for Mineral Sintering Surface Based on Multi-source Data Fusion

Defects Clustering for Mineral Sintering Surface Based on Mu...

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

作者： Yi Yang Tengtuo Chen Liang Zhao Jiaying Gu Xiaoyu Tang Yangqianhui Zhang School of Reliability and Systems Engineering Beihang University Beijing China Peng Cheng Laboratory Shenzhen China College of Control Science and Engineering State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou China School of Software Technology Dalian University of Technology Dalian China School of Mechanical Engineering Zhejiang University Hangzhou China

During sintering of minerals, multiple categories of defects often appear on the surface of material due to hysteresis of control. Fusion of data from multiple sources is considered in this paper in a bid to identify different types of defects and to improve the utilization of collected data. Specifically, this paper establishes a heterogeneous multi-source dataset based on sintering data. And a novel deep learning approach for multi-source data fusion is introduced and extended. Based on constructed multi-source dataset and associated algorithm, the downstream task of clustering is carried out. Affiliated experimental results show that the multi-source information clustering process for mineral sintered surface defects proposed in this paper outperforms unimodal approach, and relative performance metrics have reached the level of engineering applications.

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Experimental Evaluation of Dynamic On-resistance and Switching Performance of Cascode GaN HEMTs

Experimental Evaluation of Dynamic On-resistance and Switchi...

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International Conference on reliability, Maintainability and Safety,ICRMS

作者： Yao Li Xuan He Liang He Zhiyuan He Yiqiang Ni Xiaobiao Han Jun Liu School of Electrical Engineering University of South China Hengyang China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Industry-Education-Research Institute of Advanced Materials and Technology for Integrated Circuits School of Electronics and Information Engineering Anhui University Hefei China

ISBN: (数字)9798350329988

ISBN: (纸本)9798350329995

The dynamic on-resistance degradation and switching performance of a commercial 650 V cascode GaN power device are evaluated. A double-pulse test platform is used to investigate the dynamic on-resistance behaviors with various off-state drain bias voltages, drain currents, and off-state stress times under hard-switching conditions. To evaluate switching performance, an Si-based metal-oxide-semiconductor field-effect transistor (MOSFET) is used as a reference for comparing dynamic on-resistance and switching energy loss with cascode GaN high-electron-mobility transistors (HEMT). The test results indicate that higher off-state drain bias and drain current lead to more severe dynamic on-resistance degradation. Moreover, with a higher switching speed, the cascode GaN HEMT demonstrates a reduced switching energy loss compared to that of the Si-based MOSFET.

关键词： Degradation Performance evaluation MOSFET Energy loss Switches HEMTs Transistors Stress Switching circuits Testing

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