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arXiv 2021年

作者： Zhu, Yanchang Wang, Dongliang Wang, Qiqi Guo, Wenwen Liu, Cong Huang, He Ma, Hongjun Liu, Fang Liu, Huajun Ma, Yanwei Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu Zhongke Jinan250013 China School of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

Superconducting joints are one of the key technologies to make Ba1-xKxFe2As2 (Ba-122) superconducting wires or tapes for high-field applications. Herein, superconducting joints were fabricated by a simple cold-pressing method, and the joint resistance of the iron-based superconducting joint was estimated for the first time. The superconducting properties, microstructures, and elements distribution in the joint regions were investigated. At 4.2 K and 10 T, a transport critical current Ic of 105 A for the joint was obtained, and the critical current ratio (CCR = Ijointc/Itapec) of the joint was 94.6%. On the other hand, the joint show very low joint resistance of 2.7× 10-13 Ω in self-field at 4.2 K. Among iron-based superconductors (IBS), this work is the first to successfully realize a superconducting joint with such high CCR and low joint resistance. This work shows great potential to apply Ba-122 in a range of practical applications, where superconducting joints are essential. © 2021, CC BY.

关键词： Iron-based Superconductors

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Frequency multiplication with toroidal mode number of kink/fishbone modes on a static HL-2A-like tokamak

arXiv

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arXiv 2022年

作者： Zou, Zhihui Zhu, Ping Kim, Charlson C. Deng, Wei Wang, Xianqu Hou, Yawei CAS Key Laboratory of Geospace Environment Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Hefei230026 China 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 Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States SLS2 Consulting San DiegoCA92107 United States Southwestern Institute of Physics PO Box 432 Chengdu610041 China Institute of Fusion Science School of Physical Science and Technology Southwest Jiaotong University Chengdu610031 China

In the presence of energetic particles (EPs), the Long-Lived Mode (LLM) frequency multiplication with n = 1, 2, 3 or higher is often observed on HL-2A, where n is the toroidal mode number. Hybrid kinetic-MHD model simulations of the energetic particle (EP) driven kink/fishbone modes on a static HL-2A-like tokamak using NIMROD code find that, when the background plasma pressure is relatively high, and the EP pressure and the beam energy are relatively low, the mode frequency increases almost linearly with EP pressure, and the frequency is proportional to n ("frequency multiplication"), even in absence of any equilibrium plasma rotation. In addition, the frequency multiplication persists as the safety factor at magnetic axis q0 varies. In absence of EPs, the growth rate of the 1/1 mode is the largest;however, as the EP pressure increases, the growth rate of 2/2 modes or 3/3 modes becomes dominant, suggesting that the higher-n modes are more vulnerable to EPs. These results may shed light on the understanding about the toroidal mode number dependence of kink/fishbone modes in the advanced scenarios of tokamaks with weak or reversed central magnetic shear. Copyright © 2022, The Authors. All rights reserved.

关键词： Safety factor

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Complementary configuration and operation of Wind-Solar-Hydropower-Storage Systems: A comprehensive review

Complementary configuration and operation of Wind-Solar-Hydr...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Xinzhi Ding Dayi Li Wei Huang Yiping Chen State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Yunnan Electric Power Test and Research Institute (Group) Co. Kunming Yunnan Power Grid Co. Ltd. Kunming Novel Electric Power System (Beijing) Research Institute of China Southern Power Grid Beijing China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With a high percentage of renewable energy systems connected to the grid, the intermittent and volatile nature of their output adversely affects the safe and stable operation of the grid. The limited system regulation capability also leads to a reduction of resource utilization. Thus, in order to solve the problems of poor power quality, unstable output and incomplete consumption of new energy sources connected to the grid, it is crucial to carry out the research on the optimal scheduling of power systems based on power generation prediction for wind power, photovoltaic, hydropower and storage systems. Accordingly,multi-objective optimized scheduling based on hybrid energy system configuration has become a highly sought-after solution. This paper firstly summarizes the current renewable energy development issues, then reviews generation forecasting and storage capacity allocation methods for hybrid renewable energy generation systems, analyzes the energy management and control strategies of hybrid energy systems, and finally explores the potential for further large-scale engineering applications of wind-solar-hydropower-storage hybrid systems.

关键词： Reviews Optimal scheduling System integration Wind power generation Hybrid power systems Regulation Resource management Forecasting Energy management Energy storage

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PDCapsNet: A Convolution Neural Network Method for COVID-19 Detection from Chest X-Ray Images

PDCapsNet: A Convolution Neural Network Method for COVID-19 ...

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IEEE International Symposium on Information (IT) in Medicine and Education, ITME

作者： Zhihao Liang Huijuan Lu Cunqian You Wenjie Zhu Li Xie Yudong Yao Key Laboratory of Electromagnetic Wave Information Technology and Metrology College of Information Engineering China Jiliang University Hangzhou Zhejiang Province China College of Information Engineering China Jiliang University Drore Information and Technology Co. LTD Hangzhou Zhejiang Province China College of Information Engineering China Jiliang University Modern Educational Technology Center Hangzhou City Zhejiang Province China College of Biomedical Engineering and Instrumentation Science Zhejiang University Institute of Advanced Digital Technologies and Instrumentation Hangzhou Zhejiang Province China Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken New Jersey USA

The COVID-19 epidemic started in 2019 and it is still important to develop intelligent and efficient diagnostic methods for the detection of COVID-19. In the task of COVID-19 X-ray image recognition, conventional deep neural networks encounter challenges in effectively discerning distinctive features within pneumonia images, resulting in limited generalization capability when confronted with novel samples. To address this issue, we introduce a novel model in this paper, denoted as PDCapsNet. The model effectively exploits Pyconv's multi-scale fusion technique and leverages the capsule network's capacity to encapsulate diverse attributes of specific entities within COVID-19 X-ray images, resulting in enhancements in both accuracy and generalization. Experimental results show that the proposed model outperforms other previous related works.

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Observation of nonreciprocal magneto-optical scattering in nonencapsulated few-layered CrI3

arXiv

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arXiv 2020年

作者： Guo, Kai Liu, Zhen Hu, Guangwei Shi, Zhongtai Li, Yue Zhang, Linbo Chen, Haiyan Zhang, Li Zhou, Peiheng Lu, Haipeng Lin, Miao-Ling Liu, Sizhao Cheng, Yingchun Liu, Xue Lu Xie, Jianliang Bi, Lei Tan, Ping-Heng Deng, Long jiang Qiu, Cheng-Wei Peng, Bo National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China Department of Electrical and Computer Engineering National University of Singapore 117583 Singapore Key Laboratory of Flexible Electronics Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing211816 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences P. O. Box 912 Beijing100083 China

"Magneto-optical" effect refers to a rotation of polarization plane, which has been widely studied in traditional ferromagnetic metal and insulator films and scarcely in two-dimensional layered materials. Here we uncover a new nonreciprocal magneto-inelastic light scattering effect in ferromagnetic few-layer CrI3. We observed a rotation of the polarization plane of inelastic light scattering between -20o and +60o that are tunable by an out-of-plane magnetic field from -2.5 to 2.5 T. It is experimentally observed that the degree of polarization can be magnetically manipulated between -20% and 85%. This work raises a new magneto-optical phenomenon and could create opportunities of applying 2D ferromagnetic materials in Raman lasing, topological photonics, and magneto-optical modulator for information transport and storage. © 2020, CC BY-NC-SA.

关键词： Ferromagnetic materials

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Multi-objective Optimization Design of PMASynRM Based on RBF Neural Network

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Journal of Physics: Conference Series 2022年第1期2183卷

作者： Kang Shuai Zequan Li Libing Zhou Jin Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (School of Electrical and Electronic Engineering) Huazhong University of Science and Technology Wuhan Hubei 430074 China

This paper presents an optimized design method of PMASynRM based on the RBF neural network. Firstly, Sobol sensitivity analysis method is used to analyze the mutual influence of the parameter variables of the motor. Then, in order to establish the surrogate model of the finite element model, the samples are obtained by the Latin hypercube sampling method to train the RBF neural network, and the NSGA-? algorithm is used for multi-objective optimization based on the trained RBF neural network. Finally, the optimization scheme is verified by the results of finite element analysis that the proposed method can provide an optimal design.

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A Langmuir probe system for the test setup of an RF-driven negative hydrogen ion source at HUST

引用

AIP Conference Proceedings 2017年第1期1869卷

作者： P. Zhao D. Z. Chen D. Li C. Zuo 1State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei China

A test setup of an RF-driven negative hydrogen ion source is being constructed at HUST. It is operated at the typical pressure of 0.3 Pa, maximum RF power of 20 kW/1 MHz, with discharge pulse of 6–10 seconds. In order to diagnose the plasma parameters and evaluate the source performance, a highly integrated and automated Langmuir probe system has been developed in-house. It allows for multiple sweeping, mass data acquisition and automatic data evaluation in a fast diagnosis shot of several hundred milliseconds. Various analysis methods are investigated and compared for the ion density determination. Due to the low density and thick sheath in the plasma, OML theory is selected as the applicable one. Preliminary discharge and diagnosis experiments have been carried out in the experimental source. The plasma in the driver exhibits non-Maxwellian electron energy distribution with low density of 1017 m−3 and electron temperature of 59 eV at 20 kW/0.3 Pa.

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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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Localization of Chiral Edge States by the Non-Hermitian Skin Effect

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Physical Review Letters 2024年第11期132卷 113802-113802页

作者： Gui-Geng Liu (刘癸庚) Subhaskar Mandal Peiheng Zhou Xiang Xi Rimi Banerjee Yuan-Hang Hu Minggui Wei Maoren Wang Qiang Wang Zhen Gao Hongsheng Chen Yihao Yang Yidong Chong Baile Zhang Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China School of Electrical Engineering and Intelligentization Dongguan University of Technology Dongguan 523808 China School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang ZJU-UIUC Institute Zhejiang University Hangzhou 310027 China Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

Quantum Hall systems host chiral edge states extending along the one-dimensional boundary of any two-dimensional sample. In solid state materials, the edge states serve as perfectly robust transport channels that produce a quantized Hall conductance; due to their chirality, and the topological protection by the Chern number of the bulk band structure, they cannot be spatially localized by defects or disorder. Here, we show experimentally that the chiral edge states of a lossy quantum Hall system can be localized. In a gyromagnetic photonic crystal exhibiting the quantum Hall topological phase, an appropriately structured loss configuration imparts the edge states’ complex energy spectrum with a feature known as point-gap winding. This intrinsically non-Hermitian topological invariant is distinct from the Chern number invariant of the bulk (which remains intact) and induces mode localization via the “non-Hermitian skin effect.” The interplay of the two topological phenomena—the Chern number and point-gap winding—gives rise to a non-Hermitian generalization of the paradigmatic Chern-type bulk-boundary correspondence principle. Compared to previous realizations of the non-Hermitian skin effect, the skin modes in this system have superior robustness against local defects and disorders.

关键词： Edge states Photonic crystals Quantum Hall effect Chern insulators Non-Hermitian systems

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224-Gb/s 16QAM SV-DD Transmission Using Pilot-Assisted Polarization Recovery with Integrated Receiver

224-Gb/s 16QAM SV-DD Transmission Using Pilot-Assisted Polar...

引用

Optical Fiber Communication (OFC) Conference

作者： Sen Zhang Liwang Lu Linsheng Fan Bin Chen Tingting Zhang Tianjian Zuo Lei Liu Jin Tang Li Zeng Pengxin Chen Jiahao Huo Xian Zhou Alan Pak Tao Lau Chao Lu Liu Liu Changjian Guo Network Technology Laboratory Huawei Technologies Co. Ltd. Shenzhen China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Guangzhou China State Key Laboratory for Modern Optical Instrumentation College of Optical Science and Engineering Centre for Optical & Electromagnetic Research International Research Center for Advanced Photonics Zhejiang University Hangzhou China B&P Laboratory Huawei Technologies Co. Ltd. Shenzhen China School of Computer & Communication Engineering Beijing University of Science and Technology Beijing China The Hong Kong Polytechnic University Hong Kong China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen

We propose and experimentally demonstrate a low-complexity pilot-assisted analytical method for polarization demultiplexing in SV-DD systems, achieving a 224-Gb/s 16QAM transmission over 40-km SSMF and can tolerate up... 详细信息

ISBN: (纸本)9781943580866

关键词： Demultiplexing Receivers Optical fiber communication

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