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16th IET International Conference on AC and DC Power Transmission, ACDC 2020

作者： Nan, Jing Wan, Xiaodong Huo, Feng Hu, Wei Li, Xuelin State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781839533914

Composite cross-arms are used for constructing transmission tower structures due to their light weight, high strength, corrosion resistance, easy processing, good insulation performance and other advantages. In order to obtain insulation characteristics of UHVAC composite cross-arm insulators, the artificial pollution tests of UHVAC composite cross-arm insulator for single circuit and double circuit transmission lines were carried *** this paper,the pollution withstand voltage characteristics of UHVAC composite cross-arm insulator with different pollution degree and the pollution withstand voltage characteristics of silicone rubber surface with hydrophilicity and weak hydrophobicity were studied, and compared with the pollution flashover voltage of suspension composite insulator with the same voltage *** results show that the pollution flashover voltage and pollution degree of UHV composite cross-arm insulator have negative power exponent relationship when the surface of silicon rubber was hydrophilic;the pollution flashover voltageof composite cross-arm insulator under the condition of weak hydrophobicity is more than 15% higher than that under hydrophilic *** preliminary design structure satisfies the operating requirement according to the result of the pollution withstand voltage test for the UHV composite cross-arm insulator under the weak hydrophobic nature. © 2020 Institution of engineering and technology. All rights reserved.

关键词： Hydrophilicity

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Visible light communication for Vehicle to Everything beyond 1 Gb/s based on an LED car headlight and a 2 × 2 PIN array

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Chinese Optics Letters 2020年第11期18卷 32-37页

作者： Chaofan Wang Guoqiang Li Fangchen Hu Yiheng Zhao Junlian Jia Peng Zou Qiuyi Lu Jiang Chen Zhongya Li Nan Chi Academy for Engineering and Technology Shanghai Institute for Advanced Communication and Data ScienceKey Laboratory for Information Science of Electromagnetic Waves(MoE)Fudan UniversityShanghai 200433China

Visible light communication(VLC) shows great potential in Internet of Vehicle applications. A single-input multi-output VLC system for Vehicle to Everything is proposed and demonstrated. A commercial car headlight is used as transmitter. With a self-designed 2 × 2 positive-intrinsic-negative(PIN) array, four independent signals are received and equalized by deep-neural-network post-equalizers, respectively. Maximum-ratio combining brings high signal-to-noise ratio and data rate gain. The transmission data rate reaches 1.25 Gb/s at 1 m and exceeds 1 Gb/s at 4 m. To the best of our knowledge, it is the first-time demonstration of beyond 1 Gb/s employing a commercial car headlight.

关键词： visible light communication Internet of Vehicle Vehicle to Everything single-input multi-output deep neural networks maximum-ratio combining

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Li3InCl6 electrolyte with high voltage compatibility for Ni-rich layered oxide cathodes-based all-solid-state batteries

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Electrochimica Acta 2025年 535卷

作者： Liu, Chen Li, Siwu Li, Lin Luo, Qiyue Ming, Liang Jiang, Ziling Lu, Ziyu Deng, Miao Yang, Jie Cheng, Shijie Yu, Chuang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Information Mechanics and Sensing Engineering Xidian University Xian710126 China

The sulfide electrolyte-based all-solid-state batteries with high-nickel layered oxide cathodes face significant challenges due to the narrow electrochemical window of sulfides and severe side reactions caused by direct contact with high-voltage oxide cathode materials such as LiNi0.9Mn0.05Co0.05O2 (NCM90). Here, we successfully synthesized Li3InCl6 (LIC) halide electrolytes through ball-milling followed by annealing method, achieving the ionic conductivity of 2.0 mS cm−1 at room-temperature. The interface between this electrolyte and NCM90 cathode material without any interface modification is stable. By introducing the LIC electrolyte layer, the NCM90/LIC+Cl1.5/Li-In battery exhibits significantly improved electrochemical performance at different temperatures, particularly in terms of initial discharge capacity. Notably, the battery demonstrates outstanding discharge capacity and cycling stability at low temperatures. Experimental investigations reveal that the introduction of the LIC electrolyte with high oxidation potential facilitates the H2-H3 phase transition in NCM90 during high-voltage operation, which is critical for enhancing the discharge capacity. This work provides fundamental insights into interfacial engineering strategies for high-voltage sulfide-based all-solid-state battery systems. © 2025 Elsevier Ltd

关键词： Lithium-ion batteries

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Stability Evaluation of DC Distribution Systems With Multiple Voltage Source Converters and Multiple DC Transformers

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IEEE Transactions on Industry Applications 2025年

作者： Chen, Yangfan Zhang, Yu Zhao, Mengyuan Chongqing University State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing400044 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronics Engineering Wuhan430074 China

A DC distribution network (DCDN) consists of DC transformers (DCTs), voltage source converters (VSCs), along with multiple long power cables. In such systems, the DC bus voltage may exhibit oscillatory behaviour due to the mismatch between the cable impedance and port impedances of DCTs and VSCs. In this paper, the cascaded stability of a typical dual-terminal DCDN considering the terminal impedance models of VSC and DCT is investigated. The effect of cable impedance and the number of VSCs and DCTs on the DCDN bus voltage stability are evaluated. Furthermore, an active damping method of DCTs proposed in the previous work is analyzed as an example to reveal that the cascaded stability of DCDN can be enhanced if an active damping controller is implemented for DCTs. The works in this paper provide a theoretical basis for optimizing the design and stable operation of DCDNs. © 1972-2012 IEEE.

关键词： DC distribution systems

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An intelligent digital secretary for design of electric power engineering 1

An intelligent digital secretary for design of electric powe...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Lu, Yiqi Xie, Jinghai Lu, Shihua Hu, Chuye Xu, Ying Wang, Shaorong School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China State Grid Jibei Economic Research Institute Haidian District Beijing100038 China

ISBN: (纸本)9781728196596

In order to improve the digital level of design of electric power engineering and ensure the accuracy and reliability, this paper proposes an intelligent digital secretary. It clarifies the construction ideas and applications of this secretary from three aspects: the architecture, functions and intelligent business services. In intelligent business services, this paper proposes for the first time the application of feature learning based on Auto-encoder for electric power engineering design. Then, the feature parameters learned by Auto-encoder are trained through BP neural network to get the values that meet design standards. Furthermore, this paper constructs the loss function based on the optimal bias to get the results more in line with actual design requirements. Automated design algorithm based on the error model is also provided in this paper. The proposed intelligent digital secretary provides a feasible idea for realizing the leap from current manual design mode to digital design mode. © 2020 IEEE.

关键词： E-learning

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Disruption predictor based on neural network and anomaly detection on J-TEXT

Disruption predictor based on neural network and anomaly det...

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作者： Zheng, W. Wu, Q.Q. Zhang, M. Chen, Z.Y. Shang, Y.X. Fan, J.N. Pan, Y. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Disruption prediction is essential for the safe operation of a large scale tokamak. Existing disruption predictors based on machine learning techniques have good prediction performance, but all these methods need large training datasets including many disruptions to develop their successful prediction capability. Future machines are unlikely to provide enough disruption samples since these cause excessive machine damage and the prediction models used are difficult to extrapolate to a machines that the predictor was not trained on. In this paper, a disruption predictor based on a deep learning and anomaly detection technique has been developed. It regards the disruption as an anomaly, and can learn on non-disruptive shots only. The model is trained to extract the hidden features of various non-disruptive shots with a convolutional neural network and a long-shot term memory (LSTM) recurrent neural network. It will predict the future trend of selected diagnostics, then using the predicted future trend and the measured signal to calculate an outlier factor to determine if a disruption is coming. It was tested with J-TEXT discharges in flat top phase and can demonstrate comparable performance to current machine learning disruption prediction techniques, without requiring a disruption data set. This could be applied to future tokamaks and reduce the dependency on disruptive experiments. © 2020 IOP Publishing Ltd.

关键词： Anomaly detection

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Cover Image, Volume 7, Number 5, May 2025

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Carbon Energy 2025年第5期7卷

作者： Peng Cai Xin He Kangli Wang Zidong Zhang Qingyuan Wang Yumeng Liu Haomiao Li Min Zhou Wei Wang Kai Jiang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China

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Round-Robin Test of Site VSWR Validation for 18-40 GHz Band in Japan

Round-Robin Test of Site VSWR Validation for 18-40 GHz Band ...

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Asia-Pacific Symposium on electromagnetic Compatibility (APEMC)

作者： Jerdvisanop Chakarothai Katsumi Fujii Noriyuki Mitsuzuka Shinichi Okuyama Toshiki Shimazaki Hidenori Muramatsu Katsunori Miura Masaru Yoshihara Hironari Tanaka Kimihiro Tajima Takeshi Yamanaka Masashi Takabe Electromagnetic Compatibility Laboratory Electromagnetic Standard Research Center Radio Research Institute National Institute of Information and Communications Technology Tokyo Japan Matsudo Test Site Telecom Engineering Center Chiba Japan NEC Platforms Ltd. VCCI Council Tokyo Japan Japan Quality Assurance Organization Tokyo Japan EMC-Engineering Department EMC Division Riken Environmental System Co. Ltd. Saitama Japan Ohtama Calibration Service Co. Ltd. Kanagawa Japan EMC Center Environmental Business Unit Global Business Headquarters NTT Advanced Technology Corporation Tokyo Japan Intertek Japan Tokyo Japan

ISBN: (数字)9784885523472

ISBN: (纸本)9798350349498

The validation of test sites for EMI measurements in a frequency range between 18 and 40GHz is required. There has been no instruction specified in the CISPR standards for the site validation in this frequency range. However, the site VSIVR measurements might be time consuming and costly. It would be beneficial in the aspect of time and cost if the site validation can be omitted for 18 to 40GHz when the test site is already compliant with the CISPR 16-1-4 specification below 18GHz. This report shows the round-robin test results of the site VSWR for 1-6, 6-18, and 18-40 GHz bands done in six test sites in Japan. The results have shown the possibility to omit the site validation when the test site is already compliant with the CISPR $6 \mathrm{~dB}$ limit in the frequency range below 18GHz.

关键词： Uncertainty Power measurement Costs Measurement uncertainty electromagnetic interference electromagnetic compatibility Time measurement

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High-Contrast and Ultra-Narrowband Terahertz Metamaterial Absorber Based on Two-Dimensional Trenched Metal Meta-Grating

SSRN

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SSRN 2023年

作者： Wang, Wei Yan, Fengping Wang, Zhi Li, Haisu Wu, Guifang Tan, Siyu Du, Xuemei Li, Ting Wang, Xiangdong Guo, Hao Feng, Ting Institute of Optical Information Key Laboratory of Luminescence and Optical Information Ministry of Education School of Physical Science and Engineering Beijing Jiaotong University Beijing100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China Zhengzhou Xinda Institute of Advanced Technology Zhengzhou450001 China Science and Technology on Electromagnetic Scattering Laboratory Beijing100044 China Photonics Information Innovation Center Heber Provincial Center for Optical Sensing Innovations Hebei University Baoding071002 China

Metamaterial absorbers (MAs) made of metallic materials is capable of confining incident energy on the structural surface, which offers an ideal platform for ultrasensitive detection and integrated device. However, realizing a high-contrast, ultra-narrow band resonance in metamaterials remains an intractable issue. In this work, we numerically exhibit a simple MA design based on a two-dimensional trenched metal meta-grating, which features a single ultra-narrow band resonance within a clean background spectrum ranging from 0 to 2 THz. The absorption resonance characteristics a linewidth of 0.4 GHz and Q factor of 2407, thanking to interference effect between the low-order surface plasmon polariton and Wood’s anomaly as well as further assistance from introducing the air trench. The evolutions of the absorption resonance with the key geometric parameters are numerically discussed and elucidated by the Smith curve of the reflective s-parameters. The sensing performance of the MA is also evaluated. Benefited from the exposed and widely spreading resonant electromagnetic field fully interacting with the analyte, the saturated thickness, maximum sensitivity and maximum sensitivity figure of merit for the all-metal MA sensor can be respectively as high as about 300 μm, 800 GHz/RIU and 2000, verifying the superior performance of the MA sensor. Such narrow band MAs with exposed resonant fields offer possible options for other application such as spectroscopically and nonlinear enhancing devices. © 2023, The Authors. All rights reserved.

关键词： Metamaterials

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Thyroid ultrasound diagnosis improvement via multi-view self-supervised learning and two-stage pre-training

arXiv

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arXiv 2024年

作者： Wang, Jian Yang, Xin Jia, Xiaohong Xue, Wufeng Chen, Rusi Chen, Yanlin Zhu, Xiliang Liu, Lian Cao, Yan Zhou, Jianqiao Ni, Dong Gu, Ning Key Laboratory for Bio-Electromagnetic Environment and Advanced Medical Theranostics School of Biomedical Engineering and Informatics Nanjing Medical University Nanjing211166 China National-Regional Key Technology Engineering Laboratory for Medical Ultrasound School of Biomedical Engineering Health Science Center Shenzhen University Shenzhen518073 China Marshall Laboratory of Biomedical Engineering Shenzhen University Shenzhen518073 China Lab Shenzhen University Shenzhen518073 China Department of Ultrasound Ruijin Hospital Shanghai Jiaotong University School of Medicine Shanghai200025 China Shenzhen RayShape Medical Technology Co. Ltd Shenzhen518051 China Cardiovascular Disease Research Center Nanjing Drum Tower Hospital Affiliated Hospital of Medical School Medical School Nanjing University Nanjing210093 China

Thyroid nodule classification and segmentation in ultrasound images are crucial for computer-aided diagnosis;however, they face limitations owing to insufficient labeled data. In this study, we proposed a multi-view contrastive self-supervised method to improve thyroid nodule classification and segmentation performance with limited manual labels. Our method aligns the transverse and longitudinal views of the same nodule, thereby enabling the model to focus more on the nodule area. We designed an adaptive loss function that eliminates the limitations of the paired data. Additionally, we adopted a two-stage pre-training to exploit the pre-training on ImageNet and thyroid ultrasound images. Extensive experiments were conducted on a large-scale dataset collected from multiple centers. The results showed that the proposed method significantly improves nodule classification and segmentation performance with limited manual labels and outperforms state-of-the-art self-supervised methods. The two-stage pre-training also significantly exceeded ImageNet pre-training. Copyright © 2024, The Authors. All rights reserved.

关键词： Supervised learning

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