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2022 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2022)

作者： Z. Xie J. Deng H. Zhou X. Lin J. Zhang Z. Li J. Wei Extra-High-Voltage Power Transmission Company of China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan People's Republic of China

When the high voltage direct current (HVDC) system operates in ground-return-mode (GRM), ground return current with high amplitude up to several thousand amperes will penetrate into the earth. Such DC current will flow through AC lines with star-connecting and grounding at both ends, and intrude the neutral point of the transformers of the line in turn. Therefore, it will increase the reactive power consumption of the transformer and occupy the capacity of reactive power compensation equipment, as well as threaten the security and stability of the power grid. A simulation model of typical substation system operating under DC bias is established, based on which the quantitative analysis of the variation of the excitation current and the condition of reactive power consumption for transformers under different bias current is carried out. The analysis results show that the excitation current is seriously distorted and the reactive power consumed increases sharply under DC bias current with high amplitude, which occupies a large amount of reactive power compensation equipment capacity. Therefore, extremely adverse impact can be brought out on the reactive power balance and the voltage regulation of the power grid. In addition, the results of this paper are of significant reference value for researches on the reactive power characteristics of DC bias as well as the support capability of short-circuit voltage under DC bias.

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Upgrade of operation mode of bipolar pulse power supply on J-TEXT 1

Upgrade of operation mode of bipolar pulse power supply on J...

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

作者： Peng, Shiyi Ding, Yonghua Rao, Bo Wang, Nengchao Li, Mao Huazhong University of Science and Technology 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 Wuhan430074 China

ISBN: (纸本)9781728196596

With the in-depth study on the physical mechanism of mode locking, penetrating and tearing mode suppression, the original RMP power supply system has been unable to meet the experimental requirements. In order to make RMP coils have more connection methods to generate more diverse magnetic field configuration and larger current, this paper redesigns a new control system for bipolar pulse AC power supply, which make it upgrade to a power supply that can operate in DC operation mode, moreover, the output current can be reversed in one shot. Besides, the control strategy, protection, real-time detection and waveform display can meet the requirements of normal operation. Finally, performance of this new control system is tested on bipolar pulse power supply. © 2020 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Numerical simulation of tearing mode suppression by applying non-resonant magnetic perturbations on J-TEXT 1

Numerical simulation of tearing mode suppression by applying...

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

作者： Gu, Fan Jiang, Zhonghe Liang, Yunfeng Zhou, Song Wang, Zhaosu Xiong, Jingyu Yuan, Jianjun Huazhong University of Science and Technology 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 Wuhan430074 China

ISBN: (纸本)9781728196596

Numerical simulation of tearing mode suppression by applying non-resonant magnetic perturbations (non-RMPs) has been carried out in the J-TEXT tokamak based on the NIMROD (Non-Ideal Magnetohydrodynamics with Rotation, Open Discussion) code. In the present work, we investigate the growth of n = 1 and n = 2 (n is the toroidal mode number) magnetohydrodynamics (MHD) instabilities, mainly as tearing modes, in response to different modes and amplitudes of non-RMPs generated by the external helical coils. It is found that the tearing mode can be stabilized by non-RMPs, especially for the non-RMPs with mode m/n = -1/1 (m is the poloidal mode number) and coil current IMP = 4kA. © 2020 IEEE.

关键词： Magnetoplasma

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Polychromatic full-polarization control in mid-infrared light

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Light(Science & Applications) 2023年第5期12卷 894-904页

作者： Jin Chen Feilong Yu Xingsi Liu Yanjun Bao Rongsheng Chen Zengyue Zhao Jiuxu Wang Xiuxia Wang Wen Liu Yuzhi Shi Cheng-Wei Qiu Xiaoshuang Chen Wei Lu Guanhai Li State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences500 Yu Tian RoadShanghai 200083China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesNo.1 SubLane XiangshanHangzhou 310024China Shanghai Research Center for Quantum Sciences 99 Xiupu RoadShanghai 201315China University of Chinese Academy of Science No.19 Yuquan RoadBeijing 100049China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Institute of Nanophotonics Jinan UniversityGuangzhou 511443China Center for Micro-and Nanoscale Research and Fabrication University of Science and Technology of ChinaHefei 230026China Institute of Precision Optical Engineering School of Physics Science and EngineeringTongji UniversityShanghai 200092China National University of Singapore Suzhou Research Institute No.377 Linquan StreetSuzhouJiangsu 215123China

Objects with different shapes,materials and temperatures can emit distinct polarizations and spectral information in mid-infrared band,which provides a unique signature in the transparent window for object ***,the crosstalk among various polarization and wavelength channels prevents from accurate mid-infrared detections at high signal-to-noise ***,we report full-polarization metasurfaces to break the inherent eigen-polarization constraint over the wavelengths in *** recipe enables to select arbitrary orthogonal polarization basis at individual wavelength independently,therefore alleviating the crosstalk and efficiency degradation.A six-channel all-silicon metasurface is specifically presented to project focused mid-infrared light to distinct positions at three wavelengths,each with a pair of arbitrarily chosen orthogonal *** isolation ratio of 117 between neighboring polarization channels is experimentally recorded,exhibiting detection sensitivity one order of magnitude higher than existing infrared ***,the high aspect ratio~30 of our meta-structures manufactured by deep silicon etching technology at temperature−150℃ guarantees the large and precise phase dispersion control over a broadband from 3 to 4.5μ*** believe our results would benefit the noise-immune mid-infrared detections in remote sensing and space-to-ground communications.

关键词： polarization light noise

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Photonic slide rule with metasurfaces

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Light(Science & Applications) 2022年第4期11卷 674-685页

作者： Feilong Yu Jin Chen Lujun Huang Zengyue Zhao Jiuxu Wang Rong Jin Jian Chen Jian Wang Andrey E.Miroshnichenko Tianxin Li Guanhai Li Xiaoshuang Chen Wei Lu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences500 Yu Tian Road200083 ShanghaiChina. Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesNo.1 Subl ane Xiangshan310024 HangzhouChina SShanghai Research Center for Quantum Sciences 99 Xiupu Road201315 ShanghaiChina University of Chinese Academy of Science No.19 Yuquan Road100049 BejingChina. School of Engineering and Information Technology University of New South WalesCanberra 2602Australia

As an elementary particle,a photon that carries information in frequency,polarization,phase,and amplitude,plays a crucial role in modern science and ***,how to retrieve the full information of unknown photons *** ultracompact manner over broad bandwidth remains a challenging task with growing ***,we demonstrate a versatile photonic slide rule based on an ll-silicon metasurface that enables uS to reconstruct incident photons'frequency and polarization *** underlying mechanism relies on the coherent interactions of frequency-driven phase diagrams which rotate at various angular velocities within broad *** rotation direction and speed are determined by the topological charge and phase ***,our metasurface leverages both achromatically focusing and azimuthally evolving phases with topological charges+1 and-1 to ensure the confocal annular intensity *** combination of geometric phase and interference holography allows the joint manipulations of two distinct group delay coverages to realize angle-resolved in-pair spots in *** manner-a behavior that would disperse along longitudinal direction in conventional *** spin-orbital coupling between the incident photons and vortex phases provides routing for the simultaneous identifcation of the photons'frequency and circular polarization state through recognizing the spots'*** work provides an analog of the conventional slide rule to flexibly characterize the photons in an ultracompact and multifunctional way and may find applications in integrated optical circuits or pocketable devices.

关键词： rule topological elementary

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Microenvironment-responsive electrocution of tumor and bacteria by implants modified with degenerate semiconductor film

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Bioactive Materials 2023年第2期20卷 472-488页

作者： Donghui Wang Shun Xing Feng Peng Xianming Zhang Ji Tan Xueqing Hao Yuqin Qiao Naijian Ge Xuanyong Liu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China School of Health Sciences and Biomedical Engineering Hebei University of TechnologyTianjin300130China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdong510080China Intervention Center Eastern Hepatobiliary Surgery HospitalThe Third Affiliated Hospital of Naval Medical UniversityShanghai200438China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1 Sub-lane XiangshanHangzhou310024China

Implantable biomaterials are widely used in the curative resection and palliative treatment of various types of ***,cancer residue around the implants usually leads to treatment failure with cancer *** chemotherapy and radiation therapy are widely applied to clear the residual cancer cells but induce serious side *** is urgent to develop advanced therapy to minimize systemic toxicity while maintaining efficient cancer-killing ***,we report a degenerate layered double hydroxide(LDH)film modified implant,which realizes microenvironment-responsive *** film can gradually transform into a nondegenerate state and release *** in contact with tumor cells or bacteria,the film quickly transforms into a nondegenerate state and releases holes at a high rate,rendering the“electrocution”of tumor cells and ***,when placed in normal tissue,the hole release rate of the film is much slower,thus,causing little harm to normal ***,the constructed film can intelligently identify and meet the physiological requirements *** addition,the transformation between degenerate and nondegenerate states of LDH films can be cycled by electrical charging,so their selective and dynamic physiological functions can be artificially adjusted according to demand.

关键词： Electrotherapy Implant Layered double hydroxides Anti-Tumor Antibiosis

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Investigating the stress corrosion cracking of a biodegradable Zn-0.8 wt%Li alloy in simulated body fluid

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Bioactive Materials 2021年第5期6卷 1468-1478页

作者： Guan-Nan Li Su-Ming Zhu Jian-Feng Nie Yufeng Zheng Zhili Sun Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China Department of Materials Science and Engineering Monash UniversityClaytonAustralia International Research Organization for Advanced Science and Technology Kumamoto University2-39-1 KurokamiChuo-KuKumamoto860-8555Japan State Key Laboratory for Turbulence and Complex System College of EngineeringPeking UniversityBeijing100871China

Stress corrosion cracking(SCC)may lead to brittle,unexpected failure of medical ***,available researches are limited to Mg-based biodegradable metals(BM)and pure *** stress corrosion behaviors of newly-developed Zn alloys remain *** the present work,we conducted slow strain rate testing(SSRT)and constant-load immersion test on a promising Zn-0.8 wt%Li alloy in order to investigate its SCC susceptibility and examine its feasibility as BM with pure Zn as control *** observed that Zn-0.8 wt%Li alloy exhibited low SCC *** was attributed to variations in microstructure and deformation mechanism after alloying with *** addition,both pure Zn and Zn-0.8 wt%Li alloy did not fracture over a period of 28 days during constant-load immersion *** magnitude of applied stress was close to physiological condition and thus,we proved the feasibility of both materials as BM.

关键词： Biodegradable metals Zn-0.8 wt%Li alloy Stress corrosion Slow strain rate testing Constant-load immersion test

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The "Switching" Effect of Iron Coupled with Hydroxylamine on Continuous Organic Pollutants Degradation by Free Radicals

SSRN

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SSRN 2024年

作者： Tian, Qinzhu Feng, Ling Wu, Chen Wen, Junwei Qiu, Xinhong Tanaka, Kazuya Ohnuki, Toshihiko Yu, Qianqian State Key Laboratory of Biogeology and Environmental Geology Hubei Key Laboratory of Critical Zone Evolution School of Earth Science China University of Geosciences Wuhan430074 China School of Chemistry and Environmental Engineering Wuhan Institute of Technology Wuhan430205 China Advanced Science Research Center Japan Atomic Energy Agency Ibaraki Tokai319-1195 Japan Laboratory for Advanced Nuclear Energy Institute of Innovative Research Tokyo Institute of Technology 2-12-1-N1-16 Ookayama Meguro-ku Tokyo152-8550 Japan

This investigation illuminates the underlying mechanism of an ultra-high degradation efficiency of organic pollutants under alkaline conditions. In the Fe-mineral/HA/H2O2 system, HA and iron interact synergistically under alkalinity to generate sustained degradation through O2•- radicals. Under highly alkaline conditions, the lack of Fe(II) limits •OH production while BPA degradation remains remarkably high, in line with soil system studies. Here, hydroxide-rich conditions and Fe as a catalyst transform NH2OH into NH2O• radicals, which interact with molecular oxygen to form O2•- radicals. NH2OH and oxygen content supersedes Fe(II), pivotal to ROS generation. The lifetime of O2•- radicals is longer than •OH, and the former leads to a lower but continuous BPA removal under alkaline conditions. For natural systems, pollutant remediation is more dependent on the diffusion span of ROS than their reactivity. Accordingly, this insight can inform remediation strategies for highly alkaline environments. © 2024, The Authors. All rights reserved.

关键词： Alkalinity

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Viscous Effects on Nonlinear Double Tearing Mode and Plasmoid Formation in Adjacent Harris Sheets

SSRN

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SSRN 2023年

作者： Zhu, Ping Ahmad, Nisar Shen, Chao Ali, Ahmad Zeng, Shiyong Shenzhen518055 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 Pakistan Tokamak Plasma Research Institute Islamabad3329 Pakistan Department of Plasma Physics and Fusion Engineering University of Science and Technology of China Hefei230026 China

In this paper, we study the effects of viscosity on the evolution of double tearing mode (DTM) in a pair of adjacent Harris sheets based on the resistive MHD model in the NIMROD code. Similar to the tearing mode in the conventional single Harris sheet, a transition is observed in the generation of both normal and monster plasmoids at Prandtl number Pr = 1. In the Pr 1 regime this flow advection is inhibited. © 2023, The Authors. All rights reserved.

关键词： Prandtl number

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Radial and axial temperature distribution of nano-second pulsed spark discharge 1

Radial and axial temperature distribution of nano-second pul...

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

作者： Luo, Tianshu Chen, Zhe Luo, Haiyun Yang, Yong Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Tsinghua University Department of Electrical Engineering Beijing100084 China

ISBN: (纸本)9781728196596

In order to study the radial and axial temperature distribution of nano-second pulse spark discharge, this paper uses SOS pulse power supply to discharge the stainless steel needle electrode, uses spectrometer and ICCD high-speed camera to diagnose the spectrum of plasma, and conducts comparative analysis with the software. It is found that when the absolute value of radial displacement increases, the vibration temperature decreases gradually. When the absolute value of axial displacement increases, the rotation temperature decreases gradually and the temperature near the anode is higher. These results indicate the plasma temperature at different positions and provide diagnostic basis for the application of spark discharge plasma. © 2020 IEEE.

关键词： Electrodes

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