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The superior ballistic performance of highly stretchable and flexible double-face knitted fabrics(DFKF):An experimental investigation

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Defence technology(防务技术) 2025年第3期45卷 119-136页

作者： Yi Zhou Xiangpeng Xin Yang Li Yang Zhou Rui Zhang Lizhi Xu State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

When the protective and protected systems are detached,the former can be allowed to absorb the kinetic energy of the impacting projectile through large deformation without considering the back face signature of the *** paper presents a novel double-face knitted fabric(DFKF)designed for this very impacting *** tests equipped with high-speed camera were used to characterize the ballistic performance with the impact velocities ranging from 100 m/s to 450 m/*** results showed that the ballistic limits(V_(bl))of DFKF are approximately triple and double that of its counterpart UD and plain fabrics,*** mass-normalized metrics,the specific energy absorption(SEA)is 250%and 350%greater than the UD and plain fabrics at their corresponding V_(bl)*** quasi-static tests showed that the DFKF displayed greater resilience,crease recovery properties,and flexibility,which also made it an especially better candidate than UD and plain weaves for the design of umbrella surface *** was also found that DFKF is dependent on yarn count and the incorporation of spandex.A prototype anti-ballistic umbrella is manufactured using DFKF made of 200D multi-filament *** ballistic performance is also sensitive to the impact site when the umbrella is subjected to impact.

关键词： DFKF Ballistic performance SEA Resilience Energy absorption Anti-ballistic umbrella

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Four directional circular optical phased array for uniform two-dimensional beam steering at visible wavelength

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Optics Express 2025年第7期33卷 15954-15963页

作者： Zhang, Qianhan Lian, Daixin Xu, Zixu Zhao, Shi Chen, Jingye Dai, Daoxin Shi, Yaocheng State Key Laboratory for Extreme Photonics and Instrumentation Center for Optical and Electromagnetic Research International Research Center for Advanced Photonics College of Optical Science and Engineering Zhejiang University Hangzhou310058 China

Optical phased arrays (OPAs), owing to their remarkable capacity for rapid and precise beam steering, have emerged as a pivotal technology in various applications such as augmented reality, free-space optical communication, and optical imaging. In this paper, we present a 64-element two-dimensional (2D) circular OPA operating at a visible wavelength of 632.5 nm. To the best of our knowledge, this is the first time that 2D continuous beam steering with pure phase control has been realized at the visible wavelengths. We propose arrowhead antennas to reduce residual energy while maintaining the integrity of the far-field pattern. Furthermore, a four-directional array arrangement has been introduced to expand the field of view and enhance the uniformity of the side lobe suppression ratio (SLSR) at different azimuth angles. The measurement for the fabricated OPA shows 2D beam steering with an elevation angle of 9° and an azimuth angle of 360° with an SLSR of over 3 dB. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Antenna phased arrays

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Novel Inertia Control Method with Phase-Locked Error Feedforward in PLL for DFIG-Based WTs

Novel Inertia Control Method with Phase-Locked Error Feedfor...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Yu, Jiawei Zhu, Yihua Zhou, Yini Hu, Bo Li, Zheyu Li, Xiaoyu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620418

The large-scale access of wind power causes a significant reduction in the inertia of the power system, seriously threatening the security and stability of the system frequency. Inertia control methods based on the optimized PLLs provide a solution to the low inertia problem of doubly-fed inductance generator (DFIG)-based wind turbines (WTs), but they still suffer from poor dynamic performance and obvious phase-locked error in steady state. For this reason, a novel inertia control method for DFIG-based WTs is proposed in this paper to support the system frequency with better performance in all aspects. Firstly, an equivalent inertia model is deduced considering the dynamic of control and the reason why modifying PLL can realize inertia response of WT is analyzed. Then, the existing inertia control methods based on optimized PLL is introduced and a novel inertia control method with phase-locked error feed-forward in PLL (pefPLL) is proposed. After that, the inertia characteristics, dynamic performance, and steady state performance of pefPLL and other PLLs are compared. Finally, the superiority of the novel inertia control method with pefPLL is verified by simulations. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Wind turbines

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Fabrication of yttrium aluminum garnet phosphor by thermal plasma: A rapid and scalable strategy for multicomponent materials

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Journal of Materials Science and technology 2025年 235卷 244-250页

作者： Zhou, Qinqin Li, Hongzheng Gao, Yijie Hu, Peng Wang, Jinshu State Key Laboratory of Materials Low-Carbon Recycling Key Laboratory of Advanced Functional Materials Education Ministry of China School of Materials Science and Engineering Beijing University of Technology Beijing100124 China

We demonstrate a case study of Ce-doped yttrium aluminum garnet (YAG) phosphor to illustrate a novel plasma route for the synthesis of multicomponent materials with addressing morphology and structural control. The presented strategy was started directly from liquid precursors without any precipitating agents, and an innovative growth mechanism was proposed to explain the formation of monodispersed spherical particles with an adjusted size distribution. Homogeneous elemental distribution close to that of liquid precursors was also achieved due to the thermal nonequilibrium effect in plasma. Benefiting from the structural feature of the obtained product, a low transformation temperature of 1100 °C for YAG phase was obtained and final products exhibit the highest photoluminescence intensity with rather low Ce doping of 0.5 wt.%, together with excellent thermal stability of 92 % preservation of initial emission at 473 K. This work well illustrates the advance of plasma strategy in formation of multicomponent compounds with excellent performances, and its potential for large-scale production due to the transient and in-flight synthesis process. © 2025

关键词： Photoluminescence

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Experimental Study on Electrode Erosion Process with High Current Vacuum Arc 19th

Experimental Study on Electrode Erosion Process with High Cu...

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19th Annual Conference of china Electrotechnical Society, ACCES 2024

作者： Peng, Ruochen Li, Yilong Zhao, Yuan Chen, Lixue Ya, Penglong Lyu, Tianmao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science & Technology Wuhan China Key Laboratory of Pulsed Power Technology Huazhong University of Science & Technology Ministry of Education China

ISBN: (纸本)9789819613861

During the breaking process, the erosion of anode contact greatly affects the result of high current vacuum breaking. Therefore, it is important to study the forming and transforming process of anode modes for improving the breaking performance and life of vacuum circuit breaker. The cup axial magnetic field (AMF) contacts is widely used in vacuum trigger switch and vacuum on-load tap changer. In order to study the vacuum arc characteristics and anode mode change of cup AMF contacts under high current density, the 40 mm diameter cup AMF contacts with six slots is observed and studied by experimental means under the gap distance of 6 mm and 10 mm. In this paper, the arc current-voltage characteristics, vacuum arc shape and surface erosion of contact are analyzed. The analysis results show that the larger the contact gap, the larger the arc voltage, the smaller the arc anode mode threshold current and the more serious the contact erosion degree. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Anodes

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High-efficiency analysis of electromagnetic-thermal effects for absorbing honeycomb based on transformation optics

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Optics Express 2025年第1期33卷 944-953页

作者： Wang, Yun Wen, Kaihuai Yue, Xiuli Chen, Peiyan Han, Tiancheng Zhou, Peiheng Liang, Difei Deng, Longjiang National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China

Wave-absorbing honeycombs have garnered widespread attention due to their high-efficiency absorption, ultra-wideband absorption, lightweight nature, and high load-carrying capacity. However, as electromagnetic radiation power increases, the temperature of the absorbing honeycomb increases rapidly, even leading to burning. Therefore, it is significant to possess an efficient and accurate assessment of the thermal effects of absorbing honeycombs under electromagnetic radiation. However, the complex thin-walled structure of the honeycomb increases computational complexity, resulting in time-consuming, resource-intensive, and occasionally unsolvable actions. To address this issue, we implement transformation optics to expand the thin-walled structure and reconstruct the transformed electromagnetic and thermal property parameters. The transformed electromagnetic-thermal coupling simulation results were highly consistent with the actual model. Specially, the mesh count dropped from 272,717 to 17,621, the simulation time decreased from 15,792s to 242s, and the efficiency was improved by 65 times. The proposed methodology overcomes analysis difficulties on multi-scale complex structures, making it possible to analyze the honeycomb structures that traditional methods cannot handle. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Honeycomb structures

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Fabrication of Porous SiC Coatings on Quartz Substrates by Laser Chemical Vapor Deposition

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Journal of Wuhan University of technology(Materials Science) 2025年第2期40卷 330-337页

作者： YANG Meijun CHEN Rui XU Qingfang GUO Bingjian LIU Kai TU Rong ZHANG Song State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Laser etching and laser chemical vapor deposition(LCVD)techniques were proposed for the rapid preparation of high-purity,strongly bonded SiC porous micro-nano-coatings on quartz *** laser serves as an external driving force for the vertical growth of SiC whiskers,facilitating the formation of a porous nanostructure that resembles coral models found in the macroscopic biological *** porous nanostructures are beneficial for reducing thermal expansion mismatch and relieving residual *** is capable of eliminating the cracks on the surface of SiC coatings as well as enhancing the bonding of SiC coatings with quartz substrates to avoid coating detachment.

关键词： laser etching laser CVD quartz substrate SiC coating

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Plasma-assisted fabrication of multiscale materials for electrochemical energy conversion and storage

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Carbon Energy 2025年第2期7卷 144-171页

作者： Chen Li Tengfei Zhang Zhong Qiu Beirong Ye Xinqi Liang Xin Liu Minghua Chen Xinhui Xia Chen Wang Wangjun Wan Yongqi Zhang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduChina Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbinChina State Key Laboratory of New Textile Materials and Advanced Processing Technology Wuhan Textile UniversityWuhanChina College of Materials Science and Engineering Zhejiang University of TechnologyHangzhouChina School of Materials Science and Engineering Zhejiang UniversityHangzhouChina Zhejiang Academy of Science and Technology for Inspection and Quarantine HangzhouChina

Plasma,the fourth state of matter,is characterized by the presence of charged particles,including ions and *** has been shown to induce unique physical and chemical ***,there have been increased applications of plasma technology in the field of multiscale functional materials'preparation,with a number of interesting *** review will begin by introducing the basic knowledge of plasma,including the definition,typical parameters,and classification of plasma *** this,we will provide a comprehensive review and summary of the applications(phase conversion,doping,deposition,etching,exfoliation,and surface treatment)of plasma in common energy conversion and storage systems,such as electrocatalytic conversion of small molecules,batteries,fuel cells,and *** article summarizes the structure-performance relationships of electrochemical energy conversion and storage materials(ECSMs)that have been prepared or modified by *** also provides an overview of the challenges and perspectives of plasma technology,which could lead to a new approach for designing and modifying electrode materials in ECSMs.

关键词： electrocatalysts energy conversion and storage nanomaterials plasma

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Metal-organic polyhedra as dynamic cross-linker for recyclable mixed matrix membranes with promising dimension stability

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Science china Chemistry 2025年第2期68卷 705-713页

作者： Linjie Lan Mingxin Zhang Haiyan Xiao Wei Liu-Fu Yuyan Lai Jiadong Chen Jia-Fu Yin Panchao Yin State Key Laboratory of Luminescent Materials and Devices&South China Advanced Institute for Soft Matter Science and Technology Guangdong Basic Research Center of Excellence for Energy and Information Polymer MaterialsSouth China University of TechnologyGuangzhou 510641China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China

Mixed matrix membranes(MMMs)are designed by incorporating microporous inorganic fillers into polymer matrix for the integration of inorganics’excellent gas separation performance with polymers’promising ***,due to the complex interphase interaction,the prevention of long-term aging is still challenging and the poor processability/recyclability of MMMs hinders their extensive ***,a coordination assembly protocol is developed for the fabrication of MMMs with both excellent processability/recyclability upon thermal annealing and promising dimension stability even under high gas *** bearing isophthalic acid(IPA)as side chains are applied to coordinate with Cu^(2+)and the assembled 2.5 nm microporous metal-organic polyhedra(MOP),{Cu_(24)IPA_(24)},serves as multi-functional cross-linkers for the polymer network *** MOPs’well-defined microporosity grants MMMs the capability for O_(2)/N_(2) separation while their activated dynamics at high temperatures(>120℃)endows polymer networks with excellent *** contrast to conventional supramolecular units,the MOPs possess unique logarithmic ligand-exchange kinetics and they show nearly frozen bonding dynamics at room temperature,ensuring promising dimensional stability to overcome the long-term aging and high gas pressure *** work not only provides fundamental understanding of the unique relaxation dynamics of complex systems with intertwined dynamics of supramolecular bonds and polymer chains,but also paves new avenues for the fabrication of robust and recyclable MMMs and elastomers.

关键词： dynamic bonding metal-organic polyhedra mixed matrix membrane polymer recycling gas separation

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Analysis of Three-Phase Short-Circuit Electromotive Force on Six Vacuum-Break Parallel-Type Generator Outlet Circuit Breakers 11th

Analysis of Three-Phase Short-Circuit Electromotive Force on...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Sun, Likang Chen, Lixue He, Yinghui Zou, Xinyang Li, Yingzhuo State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819787791

Currently, vacuum type generator outlet circuit breaker dominates the large-capacity generator circuit breaker. However, due to the large short-circuit current at the generator outlet end, the generator outlet circuit breaker needs to bear a great short-circuit electromotive force, thus affecting its dynamic stability. In this paper, COMSOL is used to construct a model of a six vacuum break parallel type outlet circuit breaker for the protection of a megawatt-level generator. Based on Maxwell's electromagnetic theory, the transient calculation of three-phase short-circuit electromotive force under different phases is carried out for the generator outlet vacuum circuit breaker, and the great values of short-circuit electromotive force under different phases are obtained for each phase. The results show that the main component of the short-circuit electromotive force is the electromotive force in the y-direction. And based on the maximum transient electromotive force, the influence of the material on the short-circuit electromotive force is studied, which provides theoretical support for the analysis of the short-circuit electromotive force of the generator outlet circuit breaker and the optimized design of the shell. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric shielding

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