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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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On the green aurora emission of Ar atmospheric pressure plasma

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Plasma Science and technology 2022年第5期24卷 195-204页

作者： Fengwu LIU Lanlan NIE Xinpei LU 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

The Ar atmospheric pressure plasma was found to be an excellent laboratorial source for green aurora ***,the characteristic and production mechanism of the green aurora emission of the Ar atmospheric pressure plasma are still not *** this work,an Ar plasma in a long glass tube which emits intense green aurora light is *** the long glass tube,it can be concluded that the green aurora emission in the Ar plasma is not owing to the mixture of Ar plasma plume with the surrounding *** is also found that the green aurora emission often appeared beyond the active electrode when the active electrode is placed at the downstream of the gas *** green emission disappears when the traces amount of O_(2) or N_(2)(about 0.05%–0.07%)is added to *** is because the O_(2) molecules deactivate the upper state O(^(1)S),which results in the decrease of the green *** the other hand,when N_(2) is added,Ar metastable atoms are quenched by N_(2),which results in the decrease of O atoms and eventually leads to the decrease of the green emission *** intensity of the green aurora emission increases when the driving voltage frequency increases from 1 to 10 k *** importantly,it is found that the green aurora emission is not affected when a grounded stainless steel needle is in contact with the plasma ***,the green emission is not driven *** these findings are helpful for the understanding of the physics and its applications of atmospheric pressure plasma jet in space physics,laser physics and other application areas.

关键词： atmospheric pressure plasma jet plasma optical emission aurora emission

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A non‐equal gap distance dielectric barrier discharge:Between cone‐shape and cylinder‐shape electrodes

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High Voltage 2022年第1期7卷 98-105页

作者： Shaohui Jin Zhiyu Li Yubin Xian Lanlan Nie Xinpei Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina

A non‐equal gap distance dielectric barrier discharge(DBD)between cone‐shape and a cylinder‐shaped electrodes is *** DBD is driven by a nanosecond voltage *** the pulse frequency is 500 Hz or lower,ladder‐shape plasma with multiple plasma layers is generated within the gap,with a distance increasing from 1 to 7 *** to high‐speed photographs of the plasma captured by an intensified charge‐coupled camera detector camera,the ladder‐shaped plasma is formed owing to propa-gation of ring‐shaped plasma from the region of the short‐gap distance to the region of long‐gap distance with regular variations in its propagation *** propagation speed drops to zero and lasts for about 20-30 ns at the region of each plasma layer,which results in bright plasma *** electric field of the plasma layer at the region of the different gap distance is evaluated according to the optical emission intensity ratio R_(391)/_(394)of N_(2)^(+)at 391 nm and N_(2) at 394 *** obtained electric field drops from 8.1 to 6.4 kV/mm when the plasma is propagated from regions of gap distance of 2-5 *** the pulse frequency is increased to 1 kHz or higher,the discharge changes into a filamentary mode and the multiple‐layer plasma disappears.

关键词： cylinder shaped dielectric

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Distribution network gray-start and emergency recovery strategy with pumped storage unit under a typhoon

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Global Energy Interconnection 2025年第1期8卷 121-133页

作者： Zhenguo Wang Hui Hou Chao Liu Shaohua Wang Zhengtian Li Xiangning Lin Te Li Research Institute of State Grid Zhejiang Electric Power Company Hangzhou 310014PR China School of Automation Wuhan University of TechnologyWuhan 430070PR China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074PR China

Typhoons can cause large-area blackouts or partial outages of distribution *** define a partial outage state in the distribution network as a gray state and propose a gray-start strategy and two-stage distribution network emergency recovery framework.A phase-space reconstruction and stacked integrated model for predicting wind and photovoltaic generation during typhoon disasters is proposed in the first *** provides guidance for second-stage post-disaster emergency recovery *** emergency recovery scheduling model is established in the second stage,and this model is supported by a thermal power-generating unit,mobile emergency generators,and distributed *** generation includes wind power generation,photovoltaics,fuel cells,***,we con-sider the gray-start based on the pumped storage unit to be an important first step in the emergency recovery *** model is val-idated on the improved IEEE 33 node system,which utilizes data from the 2022 super typhoon“Muifa”in Zhoushan,Zhejiang,*** indicate the superiority of a gray start with a pumped storage unit and the proposed emergency recovery strategy.

关键词： Wind and photovoltaic generation prediction Pumped storage unit Gray-start Distribution network Emergency recovery strategy

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Real-time state Prediction Based Coordinated Control Strategy of LIQHYSMES

Real-time State Prediction Based Coordinated Control Strateg...

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

作者： Liu, Qi Shi, Jing Zhou, Jiachen Cheng, Siwei Cheng, Qi School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

LIQHYSMES (Liquid hydrogen with superconducting magnetic energy storage) offers rapid response, substantial capacity, and low energy conversion losses, making it ideal for large scale renewable energy integration and power grid stability. However, challenges remain in fully coordinated utilization of the storage units and safe, stable operation of the storage magnets. Accurate state prediction and control are vital for the efficient operation and coordination of LIQHYSMES. This paper proposes a state prediction based LIQHYSMES coordinated control strategy. Firstly, a superconducting magnet state prediction model based on the random forest algorithm is established. Secondly, the coordinated control strategy is outlined. Finally, simulation analysis validates the prediction model and control strategy, demonstrating their accuracy and effectiveness. © 2024 IEEE.

关键词： Prediction models

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A Multi-Unit Bidirectional Inductive Power Transfer System With Power-Synchronization Controlled Subunits

A Multi-Unit Bidirectional Inductive Power Transfer System W...

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

作者： Gan, Lin Chen, Changsong Jia, Shuran Cui, Bowen Li, Xiayan School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

A multi-unit bidirectional inductive power transfer (BIPT) system is suitable as a wireless energy trading platform for electric vehicles (EVs). Phase synchronization technique is required to implement flexible power flow pattern of such system. Traditional method utilizes dedicated synchronization module, which will increase the complexity and the cost of system. This article proposed a multi-unit BIPT system with power-synchronization controlled subunits. The resemblance between the multi-unit BIPT system and the traditional power grid dominated by synchronous machines is revealed. A power-synchronization method is proposed for the multi-unit BIPT system, which can significantly reduce the complexity and the cost of system because neither extra coils nor extra high-speed, high-precision detection and conditioning circuits are required. Experimental verification is carried out to verify the grid-to-vehicle (G2V) and vehicle-to-grid (V2G) capability of the multi-unit BIPT system and the effectiveness of the proposed power-synchronization method. © 2024 IEEE.

关键词： Vehicle-to-grid

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Spontaneous anchoring Cl intoα-Co(OH)_(2) as efficient and stable oxygen reduction electrocatalysts for seawater battery

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Rare Metals 2024年第7期43卷 3074-3083页

作者： Wang Zheng Xue-Rong Zheng Qi Lu Yan-Hui Cao Yang Wang Hai-Peng Fu Jin-Feng Zhang Yi-Da Deng Wen-Bin Hu School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Seawater battery is an advanced energy storage system that enables conversion of chemical energy to electricity by consuming metals,dissolved oxygen and seawater in anode,cathode and electrolyte,***,the oxygen reduction reaction(ORR)activity and stability of electrocatalysts can be easily deactivated due to the severe Cl~-permeation and corrosion in seawater ***,we developed a structural buffer engineering strategy by spontaneously anchoring Cl~-intoα-Co(OH)_(2) as efficient and stable ORR electrocatalysts,in which the ultrathinα-Co(OH)_(2) nanosheets were synthesized using an ultrafast solution high-temperature shock(SHTS)*** large lattice space(~0.8 nm)of layeredα-Co(OH)_(2) ensured the spontaneously penetration of Cl~-into the lattice structure and replaced part of OH~-to formα-Co(OH)_(2-x)Cl_*** continuous leaching and compensating of saturated Cl inα-Co(OH)_(2-x)Cl_x could enhance the Cl~-corrosion resistance and modulate electronic structure of Co metallic sites,thus improving the ORR electrocatalytic activity and stability in seawater ***α-Co(OH)_(2-x)Cl_x seawater batteries display superior onset and half-wave potentials of 0.71 and 0.66 V,respectively,which are much better than the counterparts ofα-Co(OH)_(2) and ofβ-Co(OH)_(2) with no Cl~-penetrating and no buffer ***α-Co(OH)_(2-x)Cl_x-based seawater batteries display stable open-circuit potential of 1.69 V and outstanding specific capacity of 1345 mAh·g^(-1).

关键词： Seawater battery Oxygen reduction electrocatalyst Solution high-temperature shock Structural buffer engineering

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Passive on-chip isolators based on the thin-film lithium niobate platform

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Chinese Physics B 2025年第3期34卷 408-413页

作者： Jiacheng Liu Gongyu Xia Qilin Hong Pingyu Zhu Kai-Kai Zhang keyu Xia Ping Xu Shiqiao Qin Zhihong Zhu College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Optical isolators,the photonic analogs of electronic diodes,are essential for ensuring the unidirectional flow of light in optical systems,thereby mitigating the destabilizing effects of back ***-film lithium niobate(TFLN),hailed as“the silicon of photonics,”has emerged as a pivotal material in the realm of chip-scale nonlinear optics,propelling the demand for compact optical *** report a breakthrough in the development of a fully passive,integrated optical isolator on the TFLN platform,leveraging the Kerr effect to achieve an impressive 10.3 dB of isolation with a minimal insertion loss of 1.87 *** theoretical simulations have demonstrated that our design,when applied to a microring resonator with a Q factor of 5×10^(6),can achieve 20 dB of isolation with an input power of merely 8 *** advancement underscores the immense potential of lithium niobate-based Kerr-effect isolators in propelling the integration and application of high-performance on-chip lasers,heralding a new era in integrated photonics.

关键词： thin-film lithium niobate Kerr effect optical isolator

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Analysis of Discharge Characteristics and Parameter Influence of Pulsed Power Supply for Electrothermal Chemical Shotguns

Analysis of Discharge Characteristics and Parameter Influenc...

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

作者： Fu, Chenxu Yu, Kexun Xie, Xianfei School of Electrical and Electronic Engineering Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The discharge current waveform of the pulse power supply(PPS) has a direct relationship with the characteristics of the discharge load. The load of the electrothermal chemical cannon is mainly a plasma generator, which involves many complex physical processes in the discharge emission process. However, at present, fixed resistance is generally used to simulate the load for discharge, so it is impossible to accurately study the discharge characteristics of pulsed power supply to electrothermal chemical cannon. Therefore, a 560KJ PPS is initially designed in this paper, and the mathematical model of the pulse power supply and plasma generator load is established. Combined with the internal ballistic model of the electrothermal chemical gun, the model is discretized by the fourth-order Runge-Kutta method, and the corresponding discharge current, discharge output energy and projectile velocity curves are calculated and drawn. Based on the established mathematical model of pulse power supply for electrothermic chemical shotguns, the effects of different parameters of PPS on discharge performance are analyzed, which provides a reference for the optimization of discharge parameters of PPS. © 2024 IEEE.

关键词： Electric discharges

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Challenges and strategies of formulating low-temperature electrolytes in lithium-ion batteries

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Interdisciplinary Materials 2023年第2期2卷 308-336页

作者： Mingsheng Qin Ziqi Zeng Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Lithium-ion batteries(LIBs)have monopolized energy storage markets in modern *** reliable operation of LIBs at cold condition(<0°C),nevertheless,is inevitably hampered by the sluggish kinetics and parasite reactions,which falls behind the increasing demands for portable electronics and electric *** electrolyte controls both Li+transport and interfacial reaction,dictating the low-temperature performance ***,the rational formulation of electrolytes is significant for realizing superior lowtemperature performance and broadening application niches of ***,we first discuss the kinetic limitations of low-temperature LIBs,highlighting the importance of electrolyte structure and interfacial ***,the advancements for formulating subzero-temperature electrolyte are summarized with in-depth discussions about electrolyte formulation,solvation structure,interfacial chemistry,and low-temperature ***,some opportunities for lithium metal batteries and the corresponding lowtemperature electrolyte are ***,the major challenges and future perspectives are outlined for low-temperature LIBs.

关键词： electrolyte lithium-ion batteries low temperatures solvation structures

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