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Elastic properties of Cu–6wt% Ag alloy wires for pulsed magnets investigated by ultrasonic techniques

Chinese Physics B 2025年第2期34卷 90-95页

作者： Ziyu Li Tianyi Gu Wenqi Wei Yang Yuan Zhuo Wang Kangjian Luo Yupeng Pan Jianfeng Xie Shaozhe Zhang Tao Peng Lin Liu Qi Chen Xiaotao Han Yongkang Luo Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering State Key Laboratory for Materials Processing and Die&Mold TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Conductor materials with good mechanical performance as well as high electrical and thermal conductivities are particularly important to break through the current bottle-neck limit(~ 100 T) of pulsed magnets. Here, we perform systematic studies on the elastic properties of the Cu–6wt% Ag alloy wire, which is a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques, i.e., resonant ultrasound spectroscopy(RUS) and ultrasound pulse-echo experiments. Our RUS measurements manifest that the elastic properties of the Cu–6wt% Ag alloy wires can be improved by an electroplastic drawing procedure as compared with the conventional cold drawing. We also take this opportunity to test the availability of our newly-built ultrasound pulse-echo facility at the Wuhan National High Magnetic Field Center(WHMFC, China), and the results suggest that the elastic performance of the electroplastically-drawn Cu–6wt% Ag alloy wire remains excellent without anomalous softening under extreme conditions,e.g., in ultra-high magnetic field up to 50 T and nitrogen or helium cryogenic liquids.

关键词： high-field magnet Cu–Ag alloy ultrasonic techniques elastic constants

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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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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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Development of HUST-PTF Scintillation System 11

Development of HUST-PTF Scintillation System

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11th International Forum on Electrical engineering and Automation, IFEEA 2024

作者： Zhou, Shaokun Chen, Aote Chen, Qushan School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China

ISBN: (纸本)9798331516611

Huazhong University of Science and technology is building a proton therapy facility (HUST-PTF) based on a superconducting cyclotron, known as the HUST-PTF. This facility is designed to use high-energy proton beam to treat cancer precisely, thereby improving the treatment effects by reducing damage to healthy tissues. The scintillation system is an essential part of the beam diagnostic system, primarily consisting of the scintillation base, CCD camera, scintillation screen, and pneumatic devices. By capturing the beam spot on the scintillation screen with a camera and using labVIEW software for image processing and data fitting, the position information of the beam can be calculated. By comparing with the theoretical calculation values, it provides guidance and reference for beam commissioning personnel. Some important beam parameter information is also locally saved for future retrieval and analysis. © 2024 IEEE.

关键词： MATlab

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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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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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Interaction Quantification of MTDC Systems Connected with Weak AC Grids

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CSEE Journal of Power and Energy Systems 2024年第5期10卷 2088-2099页

作者： Wanning Zheng Jiabing Hu Li Chai Bing Liu Zixia Sang Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Grid Hubei Economic Research Institute Wuhan 430077China

The small-signal stability of multi-terminal high voltage direct current(HVDC)systems has become one of the vital issues in modern power *** among voltage source converters(VSCs)have a significant impact on the stability of the *** paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general N-terminal HVDC system with a weak AC network ***,we derive the explicit formulae of self-/en-stabilizing coefficients for any N-terminal HVDC system,which can quantify the interactions through different paths *** relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability ***,we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of ***,extensive examples are given to demonstrate the effectiveness of the proposed method.

关键词： Interactions multi-terminal HVDC self-/enstabilizing coefficients small-signal stability

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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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Dual-Functional Organotelluride Additive for Highly Efficient Sulfur Redox Kinetics and Lithium Regulation in Lithium–Sulfur Batteries

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Energy & Environmental Materials 2023年第3期6卷 126-133页

作者： Wei Zhang Fenfen Ma Qiang Wu Ziqi Zeng Wei Zhong Shijie Cheng Xin Chen Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China GuSu Laboratory of Materials SuzhouJiangsu 215123China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

High energy density and low cost made lithium–sulfur(Li–S)batteries appealing for the next-generation energy storage ***,their commercial viability is seriously challenged by serious polysulfide shuttle effect,sluggish sulfur kinetics,and uncontrollable dendritic Li ***,a dual-functional electrolyte additive,diphenyl ditelluride(DPDTe)is reported for Li–S *** sulfur cathodes,DPDTe works as a redox mediator to accelerate redox kinetics of sulfur,in which Te radical-mediated catalytic cycle at the solid–liquid interface contributes significantly to the whole *** lithium anodes,DPDTe can react with lithium metal to form a smooth and stable organic–inorganic hybrid solid-electrolyte interphase(SEI),enabling homogeneous lithium deposition for suppressing dendrite ***,the Li–S battery with DPDTe exhibits remarkable cycling stability and superb rate capability,with a high capacity up to 1227.3 mAh g^(-1)and stable cycling over 300 ***,a Li–S pouch cell with DPDTe is evaluated as the proof of *** work demonstrates that organotelluride compounds can be used as functional electrolyte additives and offers new insights and opportunities for practical Li–S batteries.

关键词： electrolyte additive Li anode Li2 S deposition Li–S battery sulfur kinetics

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Study on the interaction mechanism of double-blade corona discharge with a large discharge gap

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Plasma Science and technology 2023年第4期25卷 101-110页

作者：李丁晨李传李家玮杨文迪肖梦涵张明于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Multi-source corona discharge is a commonly used method to generate more charged particles,but the interaction mechanism between multiple discharge sources,which largely determines the overall discharge effect,has still not been studied *** this work,a large-space hybrid model based on a hydrodynamic model and ion-transport model is adopted to study the interaction mechanism between discharge ***,the effects of the number of electrodes,voltage level,and electrode spacing on the discharge characteristics are studied by taking a double-blade electrode as an *** calculation results show that,when multiple discharge electrodes operate simultaneously,the superimposed electric field includes multiple components from the electrodes,making the ion distribution and current different from that under a single-blade *** larger the distance between discharge electrodes,the weaker the *** the electrode spacing d is larger than 4 cm,the interaction can be *** results can guide the design of large discharge gap array electrodes to achieve efficient discharge.

关键词： non-equilibrium plasma corona discharge double-blade electrode interaction numerical simulation

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