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2024 IEEE china International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zhang, Zhenyi Zhou, Zijian Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Quadrupole magnet is an important element in the beam transport and manipulation. Permanent magnet quadrupole (PMQ) lenses appear frequently in various beamline attributed to their compact structure. In this paper, a method applicable to the fringing field transformation of a short permanent magnet quadrupole lens is proposed. The large electron beam envelope error, which occurs during the focusing process of short PMQ lenses, has been addressed. This achieved by replacing sharp cut-off fringing field with multi-rectangle cut-off fringing field. The causes of fringe field transformation errors are investigated by theoretical calculations of beam dynamics. The law of magnetic field gradient curve change of a short PMQ lens is analyzed. The scale parameters in the multi-rectangle approximation method are optimized by multi-particle tracking and finite element simulation. Applying the method to PMQ lenses of varying mechanical lengths confirms the feasibility and universality of the multi-rectangle approximation method for PMQ fringe field transformation. © 2024 IEEE.

关键词： Permanent magnets

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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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Plasma-activated hydrogel:fabrication,functionalization,and effective biological model

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Plasma Science and technology 2023年第9期25卷 1-9页

作者：李嘉诚兰存涛聂兰兰刘大伟卢新培 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Wuhan National High Magnetic Field Center Wuhan 430074People’s Republic of China

Hydrogels are biomaterials with 3D networks of hydrophilic *** generation of hydrogels is turning to the development of hydrogels with the help of enabling *** can tailor the hydrogels’properties through simultaneous physical and chemical actions,resulting in an emerging technology of plasma-activated hydrogels(PAH).PAH can be divided into functional PAH and biological tissue model *** review systematically introduces the plasma sources,plasma etching polymer surface,and plasma cross-linking involved in the fabrication of ***‘diffusion-drift-reaction model’is used to study the microscopic physicochemical interaction between plasma and biological tissue PAH ***,the main achievements of PAH,including wound treatment,sterilization,3D tumor model,etc,and their development trends are discussed.

关键词： plasma-activated hydrogel plasma crosslinking biological model

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An improved efficient adaptive method for large-scale multiexplosives explosion simulations

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Defence technology(防务技术) 2025年第3期45卷 28-47页

作者： Tao Li Cheng Wang Baojun Shi School of Mechanical Engineering Key Laboratory of Advanced Intelligent Protective Equipment TechnologyMinistry of EducationHebei University of TechnologyTianjin300401China State Key Lab of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing 100081China

Shock wave caused by a sudden release of high-energy,such as explosion and blast,usually affects a significant range of *** utilization of a uniform fine mesh to capture sharp shock wave and to obtain precise results is inefficient in terms of computational *** is particularly evident when large-scale fluid field simulations are conducted with significant differences in computational domain *** this work,a variable-domain-size adaptive mesh enlargement(vAME)method is developed based on the proposed adaptive mesh enlargement(AME)method for modeling multi-explosives explosion *** vAME method reduces the division of numerous empty areas or unnecessary computational domains by adaptively suspending enlargement operation in one or two directions,rather than in all directions as in AME method.A series of numerical tests via AME and vAME with varying nonintegral enlargement ratios and different mesh numbers are simulated to verify the efficiency and order of *** estimate of speedup ratio is analyzed for further efficiency *** large-scale near-ground explosion experiments with single/multiple explosives are performed to analyze the shock wave superposition formed by the incident wave,reflected wave,and Mach ***,the vAME method is employed to validate the accuracy,as well as to investigate the performance of the fluid field and shock wave propagation,considering explosive quantities ranging from 1 to 5 while maintaining a constant total *** results show a satisfactory correlation between the overpressure versus time curves for experiments and numerical *** vAME method yields a competitive efficiency,increasing the computational speed to 3.0 and approximately 120,000 times in comparison to AME and the fully fine mesh method,*** indicates that the vAME method reduces the computational cost with minimal impact on the results for such large-scale high-energy release problems with signi

关键词： Large-scale explosion Shock wave Adaptive method Fluid field simulations Efficient method

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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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Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas

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Chinese Physics Letters 2024年第5期41卷 47-52页

作者：石鹏庄革程芝峰高丽周乙楠刘永罗景庭李景春 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Engineering and Applied Physics School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Nuclear and Radiation Safety Institute for Advanced Study in Nuclear Energy&SafetyCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 510640China

Quasi-coherent micro-instabilities is one of the key topics of magnetic confinement fusion. This work focuses on the quasi-coherent spectra of ion temperature gradient(ITG) and trapped-electron-mode instabilities using newly developed far-forward collective scattering measurements within ohmic plasmas in the J-TEXT *** ITG mode is characterized by frequencies ranging from 30 to 100 k Hz and wavenumbers(k_(θρs)) less than 0.3. Beyond a critical plasma density threshold, the ITG mode undergoes a bifurcation, which is marked by a reduction in frequency and an enhancement in amplitude. Concurrently, enhancements in ion energy loss and degradation in confinement are observed. This ground-breaking discovery represents the first instance of direct experimental evidence that establishes a clear link between ITG instability and ion thermal transport.

关键词： ITG mode collective

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Thermal cycling on microstructure and mechanical properties of laser powder bed fusion manufactured IN738LC alloy

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Rare Metals 2024年第12期43卷 6649-6672页

作者： Yong Hu Hui-Bin Jia Yong-Qi Hu Cheng Chu Xu Zhang Li-Hua Wang Dong Zhang School of Material Science and Engineering Lanzhou University of TechnologyLanzhou730050China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou730050China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Jinchang737100China

This study investigated the impact of thermal cycling effects on the microstructure and mechanical properties of IN738LC alloy manufactured by laser powder bed fusion,considering different volumetric energy densities(VEDs)and interlayer times(ILTs)as part of the experimental *** results show that low VED and long ILT samples displayed superior quality,with an average grain size of 10.97μm and relatively low strain accumulation *** contrast,samples with high VED and long ILT exhibit increased cracking and porosity,the average grain size is 14.63μm and present higher strain accumulation *** nano-primary MC phase within the alloy transformed into a spherical secondary MC phase inside the grain and a polygonal secondary MC phase on the grain *** the low VED and long ILT,the mean equivalent diameter(MED)of MC carbide within the grain and on the grain boundary was 63 and 140 nm,respectively,the tensile strength was 1072±21 *** contrast,for the high VED and long ILT,the MED of MC carbide in the grain and on the grain boundary were 47 and105 nm,respectively,and the tensile strength was794±31 *** tensile strength of high VED and long ILT decreased by 26%compared with low VED and long ILT.

关键词： Laser powder bed fusion(L-PBF) IN738LC alloy Thermal cycling Microstructure Mechanical properties

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Non-negligible role of gradient porous structure in superelasticity deterioration and improvement of NiTi shape memory alloys

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Journal of Materials Science & technology 2024年第19期186卷 48-63页

作者： Yintao Zhang Daixiu Wei Yang Chen Lechun Xie Liqiang Wang Lai-Chang Zhang Weijie Lu Guang Chen State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupWA 6027Australia

Bone-mimicking gradient porous NiTi shape memory alloys(SMAs)are promising for orthopedic im-plants due to their distinctive superelastic functional ***,premature plastic deformation in weak areas such as thinner struts,nodes,and sharp corners severely deteriorates the superelasticity of gradient porous NiTi *** this work,we prepared gradient porous NiTi SMAs with a porosity of 50%by additive manufacturing(AM)and achieved a remarkable improvement of superelasticity by a simple solution treatment *** solution treatment,phase transformation temperatures dropped signif-icantly,the dislocation density decreased,and partial intergranular Ti-rich precipitates were transferred into the *** to as-built samples,the strain recovery rate of solution-treated samples was nearly doubled at a pre-strain of 6%(up to 90%),and all obtained a stable recoverable strain of more than 4%.The remarkable superelasticity improvement was attributed to lower phase transformation tem-peratures,fewer dislocations,and the synergistic strengthening effect of intragranular multi-scale Ti-Ni ***,the gradient porous structure played a non-negligible role in both superelasticity deterioration and *** microstructure evolution of the solution-treated central strut after constant 10 cycles and the origin of the stable superelastic response of gradient porous NiTi SMAs were *** work provides an accessible strategy for improving the superelastic performance of gra-dient porous NiTi SMAs and proposes a key strategy for achieving such high-performance architectured materials.

关键词： Shape memory alloys Superelasticity Gradient porous structure Solution treatment Stable recoverable strain

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Multifunctional 3D electrodes for tunable high-performance hybrid zinc batteries

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Journal of Materials Science & technology 2024年第11期178卷 155-161页

作者： Yiming Chen Minxuan Zhou Junpeng Wu Xidan Xiao Lin Xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The high energy density and long cycling life of zinc-based batteries are restricted by the single electro-chemical reaction *** improve the electrochemical performance of batteries,electrode materials,electrolytes and membranes are regularly modified,while the construction of battery systems is often ***,a multifunctional electrode was prepared via 3D printing,which successfully coupled the metal oxide/hydroxide-zinc battery(MZB)reaction and rechargeable zinc-air battery(RZAB)*** ultrathick hierarchical 3D electrode provided a tunable capacity for the MZB system,which enabled the possibility for feasible output regulation of this hybrid *** active material NiCoLDH was discov-ered to undergo structure reconstruction during cycling,which revealed the capacity fading *** delicate system design and discovery ensured a high-performance battery configuration and revealed the corresponding mechanism,opening a new avenue for developing high-performance zinc batteries.

关键词： Zinc battery Multifunctional electrode 3D printing Hierarchical 3D structure

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Studies on thermal stability,softening behavior and mechanism of an ADS copper alloy at elevated temperatures

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Journal of Materials Science & technology 2024年第19期186卷 79-90页

作者： Feixiang Liu Xinhua Liu Guoliang Xie Yuan Wu Cunguang Chen Key Laboratory for Advanced Materials Processing(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China

An Al2O3 dispersion strengthened(ADS)alloy with an ultra-high softening temperature of∼1200 K was fabricated by the in-situ internal oxidation and reduction *** evolution of the nanometer Al2O3 particles,grain size,and consequently the softening behavior of this ADS alloy,were investigated by conducting the annealing treatments in the range from 673 K to 1273 K for 60 *** refined nanometer Al2O3 particles were found to be highly stable at elevated temperatures,leading to the high dislocation density and grain boundary stability of the *** average grain size was found to increase extremely slowly from∼0.60μm to∼0.74μm with increasing annealing temperatures from 773 K to 1273 K.A criterion for grain boundaries migration and softening was established based on the competition between grain growth and pinning effect of Al2O3 *** strong pinning effect of Al2O3 particles was found when the grain size was between the lower limit(about 0.4-0.5μm)and upper limit(2.18μm).The occurrence of softening behavior was attributed to the rapid increase of the proportion of grains larger than the upper limit.A modified Hall-Petch relationship was established by introducing the integration of the grain size distribution,which can describe this correlation between softening behavior and the pinning effect of Al2O3 *** current study not only sheds light on the further understanding of the softening mechanism of ADS copper alloy but also provides a useful route for designing copper alloy with high softening resistance.

关键词： ADS copper alloy Nanometer-scaled Al2O3 particles Grain growth Softening mechanism Softening model

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