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Design and experimental study of a field-reversed configuration plasma thruster prototype

Plasma Science and technology 2025年第3期 122-130页

作者：黄宇轩张明杨勇吕方伟易霄鹏吕超凡张毅松饶波 State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic EngineeringHuazhong University of Science and Technology National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of Physics

The field-reversed configuration（FRC） plasma thruster driven by rotating magnetic field（RMF）, abbreviated as the RMF-FRC thruster, is a new type of electric propulsion technology that is expected to accelerate the deep space exploration. An experimental prototype, including diagnostic devices, was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 kA. Under the rated operating conditions, the initial plasma density was measured to be 5 × 1017m-3, and increased to 2.2 × 1019m-3after the action of RMF. The coupling efficiency of RMF was about 53%, and the plasma current reached 1.9 kA. The axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss, which verifies the formation of FRC plasma. After optimization research, it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 Gauss. The experimental results are discussed and strategies are proposed to improve the performance of the prototype.

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Partially recrystallized 0000 microstructure enhanced strength-ductility synergy in a single phase Co35.5Ni35.5Cr10Fe10Mo9 multi-principal element alloy

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Materials Science and engineering: A 2025年 935卷

作者： Yu, Kerui Su, Honghong Hou, Yixi Pei, Guoliang Wang, Qiyu Jiang, Cheng Yang, Luyan Pang, Dawei Wei, Xiao Mao, Shengcheng Han, Xiaodong Beijing Key Laboratory of Microstructure and Property of Advanced Materials College of Materials Science and Engineering Beijing University of Technology Beijing China State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou China Department of Materials Science & Engineering Southern University of Science and Technology Shenzhen China

The CoCrFeNi multi-principal element alloy (MPEA) is well known for its remarkable ductility;however, its low room-temperature strength limits its broader practical applications. In this study, a partially recrystallized heterostructure single-phase Co35.5Ni35.5Cr10Fe10Mo9 alloy was developed. This alloy was engineered through the doping of molybdenum (Mo), an element with a larger atomic radius, in combination with a heterostructure strategy. The alloy exhibits both high yield strength (1131 MPa) and excellent ductility (23.6 %) at room temperature, showcasing a balanced enhancement of strength and ductility. Such exceptional properties of this alloy are attributed to the synergistic effects of several mechanisms, including stacking fault networks, Lomer-Cottrell dislocation locks, deformation twinning-induced plasticity, and heterogeneous deformation-induced hardening. These mechanisms work together to enhance strain-hardening during tensile deformation. This study highlights the potential of utilizing partially recrystallized heterostructures as means to optimize the mechanical properties of MPEAs. © 2025 Elsevier B.V.

关键词： Tenacity

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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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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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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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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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PandaX-xT——A deep underground multi-ten-tonne liquid xenon observatory

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Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 105-120页

作者： Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Chen Cheng Zhaokan Cheng Xiangyi Cui Yingjie Fan Deqing Fang Lisheng Geng Karl Giboni Linhui Gu Xunan Guo Xuyuan Guo Zhichao Guo Chencheng Han Ke Han Changda He Jinrong He Di Huang Junting Huang Zhou Huang Ruquan Hou Yu Hou Xiangdong Ji Yonglin Ju Chenxiang Li Jiafu Li Mingchuan Li Shuaijie Li Tao Li Qing Lin Jianglai Liu Congcong Lu Xiaoying Lu Lingyin Luo Yunyang Luo Wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Binyu Pang Ningchun Qi Zhicheng Qian Xiangxiang Ren Nasir Shaheed Xiaofeng Shang Xiyuan Shao Guofang Shen Lin Si Wenliang Sun Yi Tao Anqing Wang Meng Wang Qiuhong Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Xu Wang Zhou Wang Yuehuan Wei Mengmeng Wu Weihao Wu Yuan Wu Mengjiao Xiao Xiang Xiao Binbin Yan Xiyu Yan Yong Yang Chunxu Yu Ying Yuan Zhe Yuan Youhui Yun Xinning Zeng Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang Tao Zhang Wei Zhang Yang Zhang Yingxin Zhang Yuanyuan Zhang Li Zhao Jifang Zhou Ning Zhou Xiaopeng Zhou Yong Zhou Yubo Zhou Zhizhen Zhou New Cornerstone Science Laboratory Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China School of Physics and Astronomy Shanghai Jiao Tong UniversityKey Laboratory for Particle Astrophysics and Cosmology(MoE)Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213China School of Physics Sun Yat-sen UniversityGuangzhou 510275China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Department of Physics Yantai UniversityYantai 264005China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Beihang UniversityBeijing 102206China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 102206China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinesen Academy of SciencesHuizhou 516000China Yalong River Hydropower Development Company Ltd.Chengdu 610051China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics University of MarylandCollege ParkMaryland 20742USA State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China School of Physics Nankai UniversityTianjin 300071China SJTU Paris Elite I

We propose a major upgrade to the existing PandaX-4T experiment at the China Jinping Underground *** new experiment,PandaX-xT,will be a multi-ten-tonne liquid xenon,ultra-low background,and general-purpose *** full-scaled PandaX-xT contains a 43-t liquid xenon active *** an experiment will significantly advance our fundamental understanding of particle physics and *** sensitivity of dark matter direct detection will be improved by nearly two orders of magnitude compared to the current best limits,approaching the so-called“neutrino floor”for a dark matter mass above 10 GeV/c^(2),providing a key test to the Weakly Interacting Massive Particle *** searching for the neutrinoless double beta decay of^(136)Xe isotope in the detector,the effective Majorana neutrino mass can be measured to a 10-41 meV/c^(2) sensitivity,providing a key test to the Dirac/Majorana nature of *** neutrinos and other ultra-rare interactions can also be measured and searched for with an unprecedented background level,opening up new windows of *** on the findings,PandaX-xT will seek the next stage upgrade utilizing isotopic separation of natural xenon.

关键词： dark matter neutrino less double beta decay astrophysical neutrinos liquid xenon

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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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