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34th ACM Web Conference, WWW 2025

作者： Zhang, Xin Cai, Fei Zheng, Jianming Pan, Zhiqiang Chen, Wanyu Chen, Honghui Chen, Chonghao National Key Laboratory of Information Systems Engineering National University of Defense Technology Changsha China State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi China College of Electronic Countermeasures National University of Defense Technology Hefei China

ISBN: (纸本)9798400712746

Dynamic graph link prediction is widely utilized in the complex web of the real world, such as social networks, citation networks, recommendation systems, etc. Recent Transformer-based link prediction methods on dynamic graphs not only fail to model the fine-grained structures such as triangles with the vanilla Transformers in the graph serialization process, but also amplify the imbalanced distribution of graphs because of their over-estimation of high-degree nodes. To tackle these issues, we propose a Topology-aware Transformer on Dynamic Graph (TopDyG) for link prediction, consisting of a topology injected Transformer (Ti-Transformer) and a mutual information learning (Mi-Learning). The Ti-Transformer explores the explicit structure of serialized graphs, capturing the topological features. The Mi-Learning mines the relationship between nodes by modeling the mutual information with a prior knowledge, alleviating the over-estimation of high-degree nodes when applying the Transformer-based models for the dynamic graph link prediction task. Extensive experiments on four public datasets containing both transductive and inductive settings present the superiority of our proposal. In particular, TopDyG presents an improvement of 43.27% and 28.75% against the state-of-the-art baselines in terms of NDCG and Jaccard, respectively. The advantages are especially obvious on the high-density graphs. © 2025 Copyright held by the owner/author(s).

关键词： Dynamic graphs Link prediction Topology Transformer

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Isothermal annealing comprehensively improving the magnetic properties of nanocrystalline PrCo5 magnets

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Journal of Alloys and Compounds 2025年 1028卷

作者： Li, Yuqing Pan, Xiaowen Bian, Mengying Zhang, Dongtao Liu, Wenhe Liu, Lin Song, Wenna Liu, Weiqiang Xia, Weixing Yue, Ming State Key Laboratory of Materials Low-Carbon Recycling Beijing University of Technology Beijing100124 China College of Materials Science and Engineering Key Laboratory of Advanced Functional Materials Ministry of Education of China Beijing University of Technology Beijing100124 China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Ningbo315201 China

We demonstrate the development of nanocrystalline PrCo5 magnets through a modified hot-deformation process incorporating Pr-rich composition. This approach effectively suppresses the formation of the detrimental Pr2Co17 phase, yet introduces the Pr5Co19 phase, which results in magnetic properties comparable to the previous reports. Subsequent isothermal annealing treatment significantly reduces the Pr5Co19 content, optimizes texture, and minimizes strain concentration at stacking fault positions. This comprehensive microstructural refinement results in the simultaneous enhancement of magnetic properties. The optimized magnets exhibit superior performance metrics with remanence (Mr) of 9.72 kG, coercivity (Hci) of 10.12 kOe, and maximum energy product (BH)max of 22.34 MGOe, representing increases of 14 %, 20 %, and 60 % respectively compared to the as-deformed state. The squareness of the demagnetization curve shows marked improvement as well. Our findings establish an effective pathway for optimizing magnetic properties in nanocrystalline permanent magnet materials. © 2025 Elsevier B.V.

关键词： Permanent magnets

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A Multi-Frequency Reflector Base Station Antenna With Enhanced Beam Scanning Capabilities for 6G

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IEEE Antennas and Wireless Propagation Letters 2025年

作者： Xie, Yujie Wang, Zhengpeng Li, Yujian Miao, Jungang Gao, Steven Electromagnetic Laboratory School of Electronic and Information Engineering Beijing100191 China Beijing Jiaotong University Institute of Lightwave Technology and the Key Laboratory of All Optical Network and Advanced Telecommunication Network Ministry of Education Beijing100044 China Chinese University of Hong Kong Department of Electronic Engineering Hong Kong

This letter presents a multi-frequency base station antenna with enhanced beam scanning capabilities for high data rate 6 G communication. The antenna consists of a dual-polarized multi-frequency feed and a novel dual-cylindrical reflector antenna (DCRA). Through the rotation of the sub-reflector, which is illuminated by the feed, the beam can be scanned across a wide angle along the planar cylindrical orientation of the main reflector. This scanning process results in a beam scanning angle that is roughly twice the rotation angle of the sub-reflector. The phase center of the reflected beam from the sub-reflector is designed to coincide with the focal line of the main reflector, enabling two-dimensional focusing of the beam without loss of the scanning angle. A concise design formula based on the described antenna structure is derived, enabling the entire antenna design to follow a clear design flowchart, which incorporates a rapid method for determining the focal length product and focal point locations using near-field Fast Fourier Transform (FFT). The designed antenna achieves ±20° beam scanning coverage at 45 GHz, 100 GHz, and 220 GHz, with a gain exceeding 50 dBi at 220 GHz. Both simulation and experimental results validate the effectiveness of the proposed method. © 2002-2011 IEEE.

关键词： Antenna reflectors

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Effect of vanadium on the microstructure and high-temperature properties of 24CrNiMo coatings in direct laser deposition technology

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Journal of Materials Research and technology 2025年 36卷 6857-6873页

作者： Chao Zhang Qiang Fang Yan Liu Dengwen Hu Ying Wu Chuan Yang Lei Wang Hui Chen Key Laboratory of Advanced Technology of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu Sichuan 610031 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China CRRC Changchun Railway Vehicles Co. Ltd. Changchun Jilin 130062 China

24CrNiMo low alloy steel is extensively used in the high-speed rail industry for brake discs due to its superior strength and plasticity. This study presents an effective method for extending the life of brake discs through repair and remanufacturing, addressing the challenge of insufficient performance in the high temperature. By incorporating varying ratios of V elements into 24CrNiMo low alloy powders, the high temperature performance of the brake discs was significantly enhanced, and the strengthening mechanisms and failure behavior at the high temperature of V elements were systematically analyzed. The results indicate that the addition of V elements slightly increases the phase transition temperature of the coating, refines the lath martensite, and promotes the formation of the VC. The microhardness, tensile strength, and elongation of the coatings improve significantly with increasing V content, primarily due to the combined effects of precipitation strengthening, solution strengthening, and fine-grained strengthening. However, adding excessive V results in brittle fracture and a marked reduction in the plasticity of the coatings due to the precipitation and growth of VC in the grain boundary. At 600 °C, the coatings with 0.5 % V content demonstrated the optimal balance between tensile strength and elongation, whereas excessive V content caused low ductility due to the precipitation and growth of the VC. This study highlights that the performance of the coatings can be effectively optimized by adjusting the V content in the high temperature, providing both theoretical support and practical guidance for the remanufacturing of brake discs.

关键词： 24CrNiMo The addition of V Microhardness The property of high temperature Precipitation strengthening Solution strengthening

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Ultra-compact on-chip camera based on optoelectronic compound eyes with nonuniform ommatidia

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International Journal of Extreme Manufacturing 2025年第1期7卷 543-553页

作者： Lin Zhu Yu-Qing Liu Jia-Yi Wan Zhi-Juan Sun Dong-Dong Han Qi-Dai Chen Yong-Lai Zhang State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchunPeople’s Republic of China Zhejiang Laboratory HangzhouPeople’s Republic of China Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Emitting Materials and Technology of Ministry of EducationNational Demonstration Center for Experimental Physics EducationNortheast Normal UniversityChangchunPeople’s Republic of China

Compound eyes(CEs)that feature ultra-compact structures and extraordinary versatility have revealed great potential for cutting-edge ***,the optoelectronic integration of CEs with available photodetectors is still challenging because the planar charge-coupled device(CCD)/complementary metal oxide semiconductor(CMOS)detector cannot match the spatially distributed images formed by CE *** reach this end,we report here the optoelectronic integration of CEs by manufacturing 3D nonuniform ommatidia for developing an ultra-compact on-chip *** a proof-of-concept,we fabricated microscale CEs with uniform and nonuniform ommatidia through femtosecond laser two-photon photopolymerization,and compared their focusing/imaging performance both theoretically and *** engineering the surface profiles of the ommatidia at different positions of the CE,the images formed by all the ommatidia can be tuned on a *** this way,the nonuniform CE can be directly integrated with a commercial CMOS photodetector,forming an ultra-compact CE ***,we further combine the CE camera with a microfluidic chip,which can further serve as an on-chip microscopic monitoring *** anticipate that such an ultra-compact CE camera may find broad applications in microfluidics,robotics,and micro-optics.

关键词： artificial compound eyes two-photon photopolymerization optical electronic integration

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Domain Adaptation-based Radio Frequency Fingerprint Identification for Industrial Cyber-Physical Systems

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IEEE Network 2025年

作者： Wang, Yatong Cao, Bin Wen, Zhongyi Yan, Mu Song, Changqing Beijing Institute of Technology School of Information and Electronics Beijing100081 China Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China University of Electronic Science and Technology of China School of Information and Communication Engineering Chengdu611731 China Laboratory of Electromagnetic Space Cognition and Intelligent Control Technology Beijing100191 China University of Electronic Science and Technology of China National Key Laboratory of Wireless Communications Chengdu611731 China Laboratory of Electromagnetic Space Cognition and Intelligent Control Beijing100191 China

With the widespread adoption of cloud and fog platforms, security issues facing Industrial Cyber-Physical Systems (ICPSs) are increasingly prominent. Radio Frequency Fingerprinting (RFFI) emerges as a promising physical layer security technique for user authentication, effectively enhancing ICPS security over wireless networks by exploiting inherenthardware imperfections in transmitters. However, as technologies evolve and user environments become denser and more complex, existing RFFI techniques encounter significant domain shift challenges, leading to performance degradation. Therefore, developing domain-adaptive RFFI techniques is crucial for the effectiveness of ICPSs. In this article, we first provide a comprehensive review of the RFFI framework, emphasizing its applications in ICPSs and the key processes involved. Next, we focus on the domain shift issues faced by RFFI in ICPSs and present a comprehensive survey of domain adaptation methods. To tackle these challenges, we propose a novel feature-alignment based domain adaptation (FADA) framework for RFFI, which is designed to mitigate the performance degradation caused bycross-domain shifts by aligning the feature representations of the source and target domain. Finally, we discuss the inherent challenges and future directions for developing domain adaptation based RFFI to enhance the security of ICPSs. © 2025 IEEE. All rights reserved.

关键词： Radio frequency identification (RFID)

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Sintering, high-temperature stability, and thermal conductivity of (Zr, Nb, Hf, Ta)(C, N) high-entropy carbonitrides

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Ceramics International 2025年

作者： Bai, Yang Liang, Yuxin Bi, Juan Cui, Baoning Lu, Zhaopeng Wang, Huangxuan You, Xixi Li, Bangsheng School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China

High-entropy carbonitrides (HECNs), a new class of high-performance ceramics, hold great potential for high-temperature structural materials and thermal protection systems due to their excellent thermal stability and properties. For its better application, it is important to optimize the sintering temperature of HECNs and deeply investigate its thermal conductivity behavior. This study systematically investigates the thermodynamic stability, formation ability, and thermal properties of (ZrHfNbTa)CxN1-x through first-principles calculations and experimental validation. Thermodynamic calculations reveal that nitrogen incorporation reduces the sintering temperature required to achieve a stable high-entropy solid solution. Experimental validation by spark plasma sintering (SPS) shows that the sintering temperature can be reduced from 1950 °C to 1700 °C. Ab initio molecular dynamics (AIMD) simulations demonstrate that HECNs retain structural integrity at 1773 K. Thermal conductivity tests show an increase with temperature, but a decrease with higher nitrogen content, which is mainly caused by the increased scattering of phonons resulting from lattice distortions. The Debye-Callaway model fitting further elucidates the underlying thermal conductivity mechanisms. In summary, nitrogen incorporation enhances the thermodynamic stability and reduces thermal conductivity of HECN ceramics, providing valuable theoretical and experimental support for their application in high-temperature structural materials and thermal protection systems. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Carbon nitride

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Analysis of Spiral Scanning Amplitude Modulation Methods for Two-photon Endomicroscopy 10

Analysis of Spiral Scanning Amplitude Modulation Methods for...

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10th Symposium on Novel Optoelectronic Detection technology and Applications

作者： Cui, Haodong Wang, Conghao Liu, Huilan Zhang, Xiulei Hu, Yanhui Fu, Qiang Wu, Runlong Wang, Aimin Feng, Lishuang School of Instrumentation and Optoelectronic Engineering Beihang University Beijing100191 China Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Beijing Transcend Vivoscope Biotech Co. Ltd. Beijing100049 China Beijing Key Laboratory for Optoelectronics Measurement Technology Beijing Information Science and Technology University Beijing100192 China State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronics Peking University Beijing100871 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Two-photon endomicroscopy is a high-resolution label-free imaging technique for biological tissues. This paper analyzes sinusoidal and triangular amplitude modulation methods for spiral scanning two-photon endomicroscopy. In the theoretical modeling section, the mathematical model of PZT fiber scanner is established, and the distortion of fiber scanning trajectory caused by two amplitude modulated sine wave signals is simulated and evaluated. In the experimental verification section, a test platform is constructed to measure the scanning trajectory distortion driven by these amplitude modulated sine wave signals. Finaly, spiral scanning two-photon endomicroscopic imaging of in-vivo GFP mice brain tissues using sinusoidal amplitude modulated signals are demonstrated. © 2025 SPIE.

关键词： Amplitude modulation

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Nanoporous high-entropy Mn-Fe-Co-Ni amorphous oxide: Boosting oxygen evolution efficiency through electron spin-polarization

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Journal of Materials Science and technology 2025年 238卷 266-275页

作者： Wu, Ruoyu Gao, Ruiying Li, Zhibin Wang, Jing Wang, Hui Wu, Yuan Jiang, Suihe Zhang, Xiaobin Wang, Xianzhen Liu, Xiongjun Lu, Zhaoping Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China Institute of Materials Intelligent Technology Liaoning Academy of Materials Shenyang Shenyang110167 China Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China

Self-supporting electrocatalysts for the oxygen evolution reaction (OER) require a delicate balance of cost-effectiveness, high activity, substantial durability, and robust mechanical properties. Here, we leverage the chemical and structural complexity of Al16.7Fe16.7Co16.7Ni16.7Cr16.7Mn16.7 (at.%) high-entropy alloy (HEA) to address these requirements. Utilizing spinodal decomposition, we achieve a nanoporous structure of Fe-Cr-rich phase (A2 phase), providing a large specific surface area and robust mechanical integrity for free-standing applications. During cyclic voltammetry (CV) activation, an amorphous Mn-Fe-based HEA oxide forms in-situ on the nanoporous A2 phase, serving as an efficient electrocatalyst for OER in alkaline conditions. This nanoporous HEA amorphous oxide catalyst exhibits a low overpotential of 238 mV at a current density of 10 mA cm−2 and a low Tafel slope of 46 mV dec−1, surpassing the state-of-the-art RuO2 catalyst. This study establishes a competitive, engineering-applicable OER electrocatalyst and underscores the high-entropy effect's potential in tuning electronic structures for enhanced performance. © 2025

关键词： Spinodal decomposition

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Optimized design of chip-breaking geometry of insert for the high-stability indexable insert drill 3

Optimized design of chip-breaking geometry of insert for the...

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3rd International Conference on Electrical, Electronics, and Information engineering, EEIE 2024

作者： Jiang, Aisheng Wen, Juan Yu, RenChao Liu, Zhanqiang Wang, Shequan Zhao, Jinfu School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Jinan250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan250061 China Zhuzhou Diamond Cutting Tools Co. Ltd. Zhuzhou412007 China School of Mechanical Electrical & Information Engineering Shandong University Weihai264209 China

ISBN: (纸本)9781510688179

The chip morphology of indexable insert drills affects chip evacuation performance, which in turn influences the dimensional accuracy and surface quality of the workpiece. Simultaneously, the cutting force impacts the balance of radial forces, further affecting the dimensional accuracy and surface quality. Therefore, studying the effects of chip morphology and cutting force on the high stability applications of indexable insert drills is of significant importance. This paper proposes an optimized insert groove design for high-stability applications, focusing on cutting force and chip radius optimization. First, based on the cutting principles of indexable insert drills, insert groove parameters were selected, and an orthogonal experimental scheme was designed. key parameters affecting chip radius and cutting force were determined through simulation experiments. Second, the parameters were ranked by their influence on chip radius and cutting force, and the optimal parameter combinations were identified. Finally, the feasibility of the optimized insert groove design was verified through experiments. © The Authors.

关键词： Drills

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