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Superhydrophobic Fe-based amorphous coating fabricated by detonation spraying with excellent anti-corrosion and self-cleaning properties

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Rare Metals 2023年第2期42卷 629-644页

作者： Shuai Cui Hai-Min Zhai Wen-Sheng Li Wei Tong Xiao-Song Li An-Hui Cai Xiang-Juan Fan Xu-Qiang Li Dang-Sheng Xiong School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou730050China Hunan Provincial Key Laboratory of Electromagnetic Equipment Design and Manufacturing Hunan Institute of Science and TechnologyYueyang414000China

Amorphous alloys without crystalline defects(dislocation,crystal boundary)are ideal hydrophobic coating materials due to their low surface *** work used a synergistic method of detonation spraying and surface modification to obtain the superhydrophobic Febased amorphous coatings with high hardness and dense structure on the Q 235 *** results showed that the water contact angles(WCA)of the superhydrophobic coating was 160°±3.6°,and water droplets could bounce off the superhydrophobic coating surface,illustrating the excellent self-cleaning performance of ***,the corrosion current density(i_(corr))of the superhydrophobic coating further decreased by 2 orders of magnitude down to8.008×10^(-8)A·cm^(-2)compared to the as-deposited coating with 5.473×10^(-6)A·cm^(-2);the corrosion potential(E_(corr))of the superhydrophobic coating shifted by 34 mV to the positive side compared with that of the as-deposited coating(-310 mV).Likewise,the impedance modulus|Z|values of the superhydrophobic coating increased by nearly2 orders of magnitude up to 1×10^(5.6)compared to the asdeposited coating with 1×10^(3.8).Even through lasting immersion in NaCl for 10 days,|Z|values of the superhydrophobic coating were still much higher than those of the as-deposited *** superhydrophobic Fe-based amorphous coatings could respond to their applications under extreme conditions due to their excellent hydrophobicity and self-cleaning properties,illustrating their promising future in aerospace,automotive,and machinery industries.

关键词： Fe-based amorphous coating Detonation spraying Superhydrophobic Corrosion resistance Self-cleaning

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Inverse Design of electromagnetic Induced Transparency Metamaterials Based on Generative Adversarial Network 4

Inverse Design of Electromagnetic Induced Transparency Metam...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Zhou, Xingyu Tian, Peishuai Hu, Yanqi Sun, Qitai Xiong, Yongqian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

The unique properties of electromagnetic induced transparency (EIT) metamaterials have caused a lot of concern in the field of terahertz wave regulation, but the traditional design methods of metamaterials have the problems of long design cycle and high trial and error cost. Applying deep learning method to the inverse design process of terahertz metamaterials can greatly reduce the design complexity, so that the EIT metamaterial structure can be quickly designed according to the requirements. In this paper, a generative adversarial network (GAN) model for EIT metamaterial structure design is constructed, which realizes the mapping relationship between target spectrum and metamaterial structure parameters. The proposed GAN model can accurately predict structure parameters of the EIT metamaterial according to the target spectrum, and the error between the generated and the real parameters is less than 1μm. Moreover, by introducing the fuzzy processing, the proposed GAN model can accurately generate multiple sets of metamaterial structure according to the same target spectrum, which provides more options for designers. This model offers a novel and efficient design method for EIT metamaterials. © 2023 IEEE.

关键词： Metamaterials

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Reduction of Rotor Loss in High-Speed Electrical Machines With a Novel Composite Sleeve 26

Reduction of Rotor Loss in High-Speed Electrical Machines Wi...

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

作者： Ding, Minyue Fang, Haiyang Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Enginnering Wuhan China

ISBN: (纸本)9798350317589

The rotor eddy-current loss caused by high frequency current and magnetic field changes is very high in high-speed permanent magnet machines (HSPMM). This is one of the important factors contributing to the overheat of the PMs. Since the sleeve loss is the main component of the overall rotor loss, it is widely concerned in HSPMM. In this paper, a novel composite sleeve is proposed to reduce the rotor loss. The proposed sleeve is applied to a 90kW, 16000r/min PM machine, the total rotor loss and temperature rise are respectively decreased by 44.5% and 18.7% (25.2°C) compared with a conventional carbon fiber sleeve. Furthermore, the rotor maximum stress is obtained and validated to be within the safe range. © 2023 IEEE.

关键词： Carbon fibers

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Scan Path Optimization of Discrete Scanning Based on HE-GA in Proton Therapy 4

Scan Path Optimization of Discrete Scanning Based on HE-GA i...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Wang, Xinze Tan, Ping Shen, Xinyi Lin, Yinjie Chen, Songbin Xiong, Haimin Qian, Zhihong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

Scan path optimization in proton therapy requires efficient intelligent optimization algorithms. In this study, we discuss the optimization of the genetic algorithm (GA) for scan path optimization from three aspects: generating initial paths using heuristic algorithms, optimizing the genetic parameters of GA, and incorporating an elite preservation strategy. We propose a heuristic elite-genetic algorithm (HE-GA) and compare it with commonly used simulated annealing (SA) and GA, finding that HE-GA demonstrates higher accuracy, better stability, and faster computation. Using HE-GA under discrete scanning, we analyze tumor cases under different scanning dead times and observe that optimizing the total scanning time by reducing the scanning dead time can lead to improvements. This enables repetitive scanning with the same duration as the zigzag scanning pattern, providing better protection for patients' critical organs. © 2023 IEEE.

关键词： Genetic algorithms

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A Symmetrical-Structure Fault Current Limiter for Bipolar DC Distribution Networks

A Symmetrical-Structure Fault Current Limiter for Bipolar DC...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Chen, Yangfan Zhang, Yu Huazhong University of Science and Technology State Key of Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Energering Wuhan China

ISBN: (纸本)9798350307832

In a bipolar DC distribution network, both the pole-to-ground fault (PGF) and the pole-to-pole fault (PPF) would threaten its security and stability. This paper proposes a symmetrical-structure fault current limiter (SSFCL) topology, which can help achieve fault riding through (FRT) of PGF and PPF in a bipolar DC distribution network. With the SSFCL, the rising speed of the fault current can be limited, thus ensuring the safety of the DC transformers (DCTs). Then the fault current can be hysteresis controlled within a required range, which provides an adequate fault criterion to locate the faulty load branch. The discharging path of the SSFCL can create a fault current zero point, enabling the solid-state switches to achieve zero-current switching (ZCS) when cleaning the faulty branch. In addition, with the SSFCL, the terminal voltages of the DCTs would not decay during the FRT process, which ensures the fast restoration of the power supply after the fault has been cleaned. The effectiveness of the SSFCL is verified on a ± 375 V bipolar DC experimental prototype. The SSFCL presented in this article provides a solution for the DC fault in a bipolar DC distribution network. © 2023 IEEE.

关键词： DC transformers

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Research on the electromagnetic Interference of Scanning Magnet Magnetic Field to Cable in Proton Therapy 4

Research on the Electromagnetic Interference of Scanning Mag...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Shen, Xinyi Tan, Ping Wang, Xinze Lin, Yinjie Chen, Songbin Xiong, Haimin Qian, Zhihong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

Proton therapy is a new method to treat tumors. The main method of proton therapy is the pencil beam scanning (PBS), whose core component is the scanning magnets. The beam is deflected under the magnetic field of the scanning magnets. Various cables are arranged near the scanning magnets. The excitation current and magnetic field of the scanning magnets will cause electromagnetic interference to the surrounding cables. To reduce electromagnetic interference, the shielding structure is designed. In this paper, the type of cables near the scanning magnets is analyzed first. Then, using Computer Simulation technology (CST) CABLE STUDIO, the magnet magnetic field is modeled, the influence of the magnetic fields on the strong electrical cables, weak electrical cables and multi-channel signal cables are simulated. This paper further analyzes the influence factors of the shielding frame such as the layer thickness, the size and the shielding material on shielding effect. It is concluded that the shielding effect of coaxial cable is better than that of single cable. The larger the thickness of the shielding frame, the smaller the size, the larger the conductivity and relative permeability of the shielding material, the better the shielding effect. © 2023 IEEE.

关键词： Signal interference

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Design of a Dynamic Ridge Filter for Shortening Beam Delivery Time: A Simulation Study 4

Design of a Dynamic Ridge Filter for Shortening Beam Deliver...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Yu, Benzhaoxia Liu, Xu Wang, Wei Qin, Bin Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798350305562

Shortening the delivery time for proton therapy can improve the treatment efficiency and efficacy. Energy layer switching time (ELST) is the main contributor to the delivery time. In this study, we design a general dynamic ridge filter (D-RiFi) to broaden the width of the pristine Bragg peak, which can significantly reduce the number of energy layers and the treatment time. By optimizing the shape of D-RiFi, the maximum width of the Bragg peak can be extended to 3.16 cm with a dose flatness of 2.3%. The placement of D-RiFi also influences the beam size and lateral dose uniformity at the isocenter. According to the result of the Monte Carlo simulation, the D-RiFi should be placed 50cm away from the isocenter to satisfy the clinical dose uniformity of 2.5%. Furthermore, the hybrid broadening of the D-RiFi is proposed to reduce the number of energy while reducing the distal falloff width (DFW). The number of energy layers can be reduced by 76.19 % from 21 to 5 with the DFW of 0.54cm, which is conducive to realizing fast proton therapy and some advanced motion-control techniques (e.g., volume repainting, real-time tumor tracking). © 2023 IEEE.

关键词： Proton beams

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A Real-Time Junction Temperature Estimating Method for SiC MOSFET Based on the Turn-on Drain-Source Current Oscillation

A Real-Time Junction Temperature Estimating Method for SiC M...

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

作者： Yang, Fengming Liang, Lin Zhang, Ziyang State Key Laboratory of Advanced Electromagnetic Technology Power Electronics and Energy Management Key Laboratory Ministry of Education of China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430070 China

ISBN: (纸本)9789819618514

Online junction temperature (Tj) measurement is critical for SiC MOSFET reliability evaluation health management and life prediction. In order to make the tradeoff between availability, simplicity, as well as accuracy, this article demonstrates a real-time junction temperature estimating method by selecting the current oscillation peak of drain source (Ioscpeak) during turn-on transient as a temperature sensitive electrical parameter (TSEP). The theoretical and simulation analysis results show that the Ioscpeak is available to be a TSEP. Then, the model of Ioscpeak and Tj is derived through fitting curve based the experimental results. The voltage and load current dependency of proposed method are also discussed. The experimental results demonstrate that the bus voltage level has a negligible influence to the relationship between the Ioscpeak and the Tj, the value of Ioscpeak is increasing with the increment of current level at the specific temperature. The sensitivity of proposed method has a satisfactory performance of junction temperature estimation. The estimation circuit of proposed method has a simplicity hardware with low cost and easy to be implanted with gate drive of SiC MOSFET. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： MOSFET devices

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Active Damping of DC Transformer with ISOP Structure Based on Impedance Reshaping

Active Damping of DC Transformer with ISOP Structure Based o...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

ISBN: (纸本)9798350316445

The DC transformers (DCTs) constructed by input-series-output-parallel (ISOP) structure with dual active bridge (DAB) submodules (SMs) would face the risk of instability due to the equivalent inductance of input power line, which are neglected in most existing research. This work evaluates the stability characteristics of DCTs and proposes an active damping method for DCTs to ensure the stability. First, the input impedance of DCT is derived. Then, the stability characteristics of DCT are analyzed based on Nyquist Criterion. Next, an impedance reshaping control scheme (IRCS) for DCT is proposed to reshape the input impedance of DCT to achieve stabilization, which is easy to be implemented and no additional sensors are needed. Finally, the relevant experiments validate the performance of IRCS. © 2023 IEEE.

关键词： Cascaded stability DC transformers Dual active bridge Impedance reshaping Input-series-output-parallel

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Stress wave analysis of high-voltage pulse discharge rock fragmentation based on plasma channel impedance model

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Plasma Science and technology 2023年第6期25卷 52-64页

作者：黄仕杰刘毅赵勇徐尤来林福昌李化张钦李柳霞 School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Key Laboratory of Pulsed Power Technology(Huazhong University of Science and Technology) Ministry of EducationWuhan 430074People's Republic of China

High-voltage pulse discharge(HVPD)rock fragmentation controls a plasma channel forming inside the rock by adjusting the electrical parameters,electrode type,*** this work,an HVPD rock fragmentation test platform was built and the test waveforms were *** the effects of temperature,channel expansion and electromagnetic radiation,the impedance model of the plasma channel in the rock was *** parameters and initial values of the model were determined by an iterative computational *** model calculation results can reasonably characterize the development of the plasma channel in the rock and estimate the shock wave *** on the plasma channel impedance model,the temporal and spatial distribution characteristics of the radial stress and tangential stress in the rock were calculated,and the rock fragmentation effect of the HVPD was analyzed.

关键词： stress wave shock wave plasma channel impedance model rock fragmentation high-voltage pulse discharge

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