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3rd International Conference on Energy, Power and Electrical engineering, EPEE 2023

作者： Wang, Weiyi Li, Mengqi Wang, Bingkai Xiong, Zilan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350318180

In this study, the effect of discharge gap and applied voltage on the ozone generation by DC needle-needle discharge was investigated. The relationship between the production efficiency and the energy cost as well as the generation rate were discussed. It has been found that under all experimental conditions, the ozone concentration increased with processing time, but under the same gap distance, the ozone concentration and generation rate initially increased and then decreased with the increase of the applied voltage and injected energy. The energy cost of ozone generation under the discharge power and the total power were calculated and compared. The energy cost basically increased with the applied voltage and power consumption. Therefore, to obtain the optimal parameters for ozone production, both the energy cost and the generation rate should be considered. © 2023 IEEE.

关键词： air plasma energy cost needle-needle discharge ozone generation

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Enhancing properties of high-entropy alloys via manipulation of local chemical ordering

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Journal of Materials Science & technology 2024年第13期180卷 23-31页

作者： Yihan Wang Meiyuan Jiao Yuan Wu Xiongjun Liu Hui Wang Suihe Jiang Xiaobin Zhang Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

*** High entropy alloys(HEAs),arising from the incorporation of multiple principal elements[1,2],have garnered extensive atten-tion due to their great potential to be utilized under extreme con-ditions[3-5].

关键词： alloys entropy utilized

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Single-Pole Fault Injection Directional Pilot Protection for Flexible DC Lines 17th

Single-Pole Fault Injection Directional Pilot Protection for...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Ma, Ruizhi Wen, Minghao Chen, Yu Han, Ke Wang, Xingzhu Han, Xiangyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819904075

In the case of single-pole ground fault on the transmission line of MMC-based DC system, the single-ended protection has poor endurance to high-impedance faults, while the double-ended protection performance is limited by the pilot channel. This paper proposed a pilot protection scheme using sound pole active injection of feature signals. Based on the controlled characteristics of hybrid MMC during DC line faults, the DC fault ride-through control strategy is developed considering the requirements of relay protection, using the sound pole commutation valve to actively inject the feature frequency sinusoidal signal into the line during single pole faults, and realizing the fault direction information interaction through the detection of the feature frequency signal to achieve fault discrimination within and outside the DC line. Simulation results show that the protection algorithm proposed in the paper accurately identifies the fault area under the condition of a single pole fault with 500 Ω transition resistance within 10 ms after the fault. The protection scheme does not depend on the pilot channel and line boundary elements and requires low sampling rate. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Poles

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A Two-stage EV Wireless Charging System Based on LCC-S Resonance and Its Wide Input and Output Voltage Range Control Method 26

A Two-stage EV Wireless Charging System Based on LCC-S Reson...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Tan, Xiangwen Duan, Shanxu Li, Yong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan China

ISBN: (纸本)9798350317589

With the gradual popularization of electric vehicle (EV), wireless charging has become an important method for EV charging due to its convenience, safety and environmental adaptability. Traditional EV wireless charging systems often adopt a three-stage architecture, resulting in low energy efficiency and high manufacturing costs. This paper presents a two-stage electric vehicle wireless charging system based on LCC-S resonance to realize wireless power transmission with high efficiency and low grid current ripple. The limiting factors of the output voltage range are analyzed, and an output voltage control method combining DC bus voltage regulation and full-bridge phase-shifting is designed. The charging system can satisfy the grid voltage range of S5-265V and vehicle side voltage range of 300-450V, and can tolerate the variation of coupling coefficient. The simulation result shows that the system efficiency is 93% and the current THD can get less than 1%. © 2023 IEEE.

关键词： Electric vehicles

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Femtosecond laser-induced periodic surface structures on hard and brittle materials

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Science China(Technological Sciences) 2024年第1期67卷 19-36页

作者： ZHAO GuoXu WANG Gong LI YunFei WANG Lei LIAN YuDong YU Yu ZHAO Hui WANG YuLei LU ZhiWei Center for Advanced Laser Technology Hebei University of TechnologyTianjin 300401China Hebei Key Laboratory of Advanced Laser Technology and Equipment Tianjin 300401China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China School of Information and Electrical Engineering Hebei University of EngineeringHandan 056038China

Hard and brittle materials have high hardness,excellent optical stability,chemical stability,and high thermal ***,they have huge application potential in various fields,such as optical components,substrate materials,and quantum information,especially under harsh conditions,such as high temperatures and high *** laser direct writing technology has greatly promoted the development of femtosecond laser-induced periodic surface structure(Fs-LIPSS or LIPSS by a femtosecond laser)applications of hard and brittle materials due to its high precision,controllability,and three-dimensional processing *** far,LIPSSs have been widely used in material surface treatment,optoelectronic devices,and ***,a consensus has not been reached regarding the formation mechanism of LIPSSs on hard and brittle *** this paper,three widely accepted LIPSS formation mechanisms are introduced,and the characteristics and applications of LIPSSs on diamonds,silicon,silicon carbide,and fused silica surfaces in recent years are *** addition,the application prospects and challenges of LIPSSs on hard and brittle materials by a femtosecond laser are discussed.

关键词： laser-induced periodic surface structures hard and brittle materials femtosecond laser

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Rational design of robust and transparent superrepellent surfaces for long-term marine antifouling

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Science China(Technological Sciences) 2024年第7期67卷 2031-2039页

作者： CHEN Hui WANG Zhi WANG DaHeng XIAO Feng FU Guang-En BU XueLing ZHAO Lei ZHANG Tao WU DaHeng PU JiBin The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science&TechnologyWuhan 430081China Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

Superhydrophobic surfaces have demonstrated exceptional efficacy in combatting biofouling contaminations of optical devices and equipment in marine applications. However, the fabrication of highly transparent superhydrophobic materials remains a formidable challenge due to the inherent trade-off between surface roughness for superhydrophobicity and optical ***, we design a robust and transparent superhydrophobic coating(Si-POSS) embedded silica nanoparticles(200 nm) with fluorinated polyhedral oligomeric silsesquioxanes(F-POSS) and zinc pyrithione(ZPT). The Si-POSS coating exhibits excellent water repellence toward diverse liquids and optical transmittance exceeding 90% in the visible spectrum. Moreover, the Si-POSS coating sustains long-term anti-bacterial(> 99.11%) and anti-algal effects for over 30 days, accompanied by mechanical,chemical, and thermal stability. This research asserts that the Si-POSS coating with outstanding combined characteristics holds significant potential for marine applications, particularly in self-cleaning and antifouling endeavors.

关键词： superhydrophobic surface transparent marine antifouling nanoparticles

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An Iterative Tuning Method for Feedforward Control of Parallel Manipulators Considering Nonlinear Dynamics

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Chinese Journal of Mechanical engineering 2025年第1期38卷 295-305页

作者： Xiaojian Wang Jun Wu Beijing Key Laboratory of Transformative High-end Manufacturing Equipment and Technology Tsinghua UniversityBeijing 100084China State Key Laboratory of Tribology in Advanced Equipment and Institute of Manufacturing Engineering Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Feedforward control is one of the most effective control techniques to increase the robot’s tracking ***,most of the dynamic models used in the feedforward controllers are linearly simplified such that the nonlinear and time-varying characteristics of dynamics in the workspace are *** this paper,an iterative tuning method for feedforward control of parallel manipulators by taking nonlinear dynamics into account is *** on the robot rigid-body dynamic model,a feedforward controller considering the dynamic nonlinearity is *** iterative tuning method is given to iteratively update the feedforward controller by minimizing the root mean square(RMS)of the joint errors at each *** effectiveness and extrapolation capability of the proposed method are validated through the experiments on a 2-DOF parallel *** research proposes an iterative tuning method for feedforward control of parallel manipulators considering nonlinear dynamics,which has better extrapolation capability in the whole workspace of manipulators.

关键词： Parallel manipulator Dynamic model Feedforward control Iterative learning control Parameter design

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A modified maxwell-pulse thermoplastic constitutive model of in-situ Ta-particle reinforced Zr-based bulk metallic glass composites

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Progress in Natural Science:Materials International 2024年第4期34卷 753-766页

作者： Pan Gong Zhuang Wang Guoqing Yu Maojun Li Xin Zhuo Xuefeng Tang Mao Zhang Lei Deng Junsong Jin A.A.Churakova Xinyun Wang State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Institute of Molecule and Crystal Physics Ufa Federal Research Center RAS

The impact of different Ta contents on the mechanical properties and thermoplastic forming ability of in-situ Taparticle reinforced Zr–Cu–Al–Ni bulk metallic glass composites was studied. The composition(Zr55Cu30Al10-Ni5)94Ta6with the best comprehensive performance was chose for a systematic investigation into its thermoplastic behavior in the supercooled liquid region（SLR）, with quantitative analysis conducted by the strain rate sensitivity index and activation volume. The steady-state flow stress and the stress overshoot intensity were augmented with deformation temperature decreasing, strain rate increasing, and the addition of the secondary phase, leading to a transition from Newtonian to non-Newtonian flow regime. The addition of the secondary phase deteriorated the rheological properties of the material. To solve the problem that the Maxwell-Pulse constitutive model showed an inability to accurately describe the steady-state flow process. A modified constitutive relationship, introducing the effect of the volume fraction of Ta particles on viscosity and elastic modulus in the steady-state flow process which was ignored in Maxwell-pulse model, was established. The fitting results of the true stress-strain curves of the modified Maxwell-pulse constitutive model were in better agreement with the experimental date than those of the Maxwell-pulse constitutive model, with higher prediction accuracy. The modified constitutive model well predicted the thermoplastic deformation behavior of(Zr55Cu30Al10Ni5)*** influence mechanism of Ta particles on the flow behavior was explained that Ta particles increased the viscosity of amorphous matrix, thereby hindering its flow and ultimately leading to an increase in flow stress.

关键词： Bulk metallic glass composites Supercooled liquid region Thermoplastic deformation Constitutive model Influence mechanism

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Microscopic strengthening and failure mechanisms of graphene/Al composite: A molecular dynamics study

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Progress in Natural Science:Materials International 2024年第4期34卷 720-730页

作者： Huijuan Guo Xiaoyan Sun Liang Chen Yuhui Zhao Kaiqiang Shen Xiangshan Kong State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Intelligent Manufacturing Department Yantai Engineering and Technology College

This study focused on the microscopic strengthening and failure mechanisms of the Al matrix reinforced by graphene(Gr), and the effects of number of layers, chirality, and arrangement of Gr were calculated based on the molecular dynamics simulation. The results revealed that the Young's modulus and yield strength were significantly enhanced by the addition of Gr. In Gr/Al composites with monolayer Gr, the zigzag Gr exhibited a better ultimate strain than the armchair Gr, indicating that the plastic deformation was affected by the chirality, and the dislocation hindrance and load transfer were the dominated strengthening mechanisms. The crack in the armchair Gr was limited to follow straight paths, while that in zigzag Gr extended in a petal-like manner across multiple directions. In Gr/Al composite with multilayer Gr, the dispersing Gr showed a stronger strengthening effect than the stacking Gr, and the strengthening effect increased with increasing the volume fraction of Gr. The dispersing Gr strongly hindered the movement of dislocations, while the Al matrix in the composite with stacking Gr could retard the folding of Gr. Moreover, Gr nanosheets fractured layer by layer rather than simultaneously fractured in the Gr/Al composites with multilayer Gr.

关键词： Molecular dynamics Gr/Al composites Strengthening Failure

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Redox Couple Modulation in NASICON Phosphates toward High-Performance Cathodes for Na-Ion Batteries

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Energy Material Advances 2024年第1期5卷 570-586页

作者： Dashan Fan Qiuyu Shen Han Li Xuanhui Qu Lifang Jiao Yongchang Liu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyState Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Natrium superionic conductor(NASICON)-type phosphates have aroused a great interest as cathode materials for sodium-ion batteries(SIBs)by virtue of their stable 3-dimensional frameworks,flexible molecular formula tunability,and superior ionic ***,the intrinsic low electronic conductivity and relatively low theoretical specific capacity place obstacles in their way toward achieving higher electrochemical *** addition,only 2-electron reactions in most NASICON cathodes and poor reversibility of high-voltage redox couples severely limit their energy *** address the above tough issues,an in-depth understanding of transition metal selection,elements ratio optimization,and Na-storage mechanism is of paramount ***,this mini review summarizes the latest progresses on the NASICON-type phosphate cathodes for SIBs from the perspective of redox couple *** cathodes featuring high operating voltage and multielectron reactions are discussed in ***,the remaining challenges and personal outlooks based on redox couple regulation are put forward,shedding light on the designing rules for high-energy and long-durability NASICON-type phosphate cathodes for SIBs in the future.

关键词： theoretical specific capacity ionic conductivityneverthelessthe cathode materials electronic conductivity high performance cathodes redox couple modulation sodium ion batteries electrochemical performance

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