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Impact of p-AlGaN/GaN hole injection layer on GaN-based vertical cavity surface emitting laser diodes[Invited]

Chinese Optics Letters 2022年第3期20卷 35-40页

作者： Lei Han Yuanbin Gao Sheng Hang Chunshuang Chu Yonghui Zhang Quan Zheng Qing Li Zi-Hui Zhang State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300401China Key Laboratory of Electronic Materials and Devices of Tianjin School of Electronics and Information EngineeringHebei University of TechnologyTianjin 300401China Hebei Key Laboratory of Advanced Laser Technology and Equipment Tianjin 300401China Key Engineering Center of Flat-Panel-Display Glass and Equipment Shijiazhuang 050035China

The hole injection capability is essentially important for GaN-based vertical cavity surface emitting lasers[VCSELs]to enhance the laser *** this work,we propose GaN-based VCSELs with the p-AlGaN/p-GaN structure as the p-type hole supplier to facilitate the hole *** p-AlGaN/p-GaN heterojunction is able to store the electric field and thus can moderately adjust the drift velocity and the kinetic energy for holes,which can improve the thermionic emission proc-ess for holes to travel across the p-type electron blocking layer[p-EBL].Besides,the valence band barrier height in the p-EBL can be reduced as a result of usage of the p-AlGaN ***,the better stimulated radiative recombination rate and the increased laser power are obtained,thus enhancing the 3 dB frequency ***,we also inves-tigate the impact of the p-AlGaN/p-GaN structure with various AIN compositions in the p-AlGaN layer on the hole injection capabilit,the laser power,and the了dB frequency bandwidth.

关键词： GaN-based VCSEL hole injection laser power modulation response

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Review on Optimal Operation Models and Intelligent Solving Algorithms of Cascade Hydropower Stations 4

Review on Optimal Operation Models and Intelligent Solving A...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Si, Dajun Liang, Shuhao Sun, Peng Wu, Yaowu Li, Lingfang Wang, Yuan Center Yunnan Power Grid Co. Ltd. Power Grid Planning and Construction Research Kunming China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728171494

The optimal operation of cascade power stations is not only one of the main development directions for the comprehensive exploitation, utilization and management of water resources, but also an important strategic direction for the sustainable development of national energy. This article starting with the overview and composition of the cascade power station group, expounds the operation characteristics and task requirements of cascade hydropower under different time scales, and provides a comprehensive overview of the objective functions and constraints of medium and long-term scheduling, short-term scheduling, and day-ahead scheduling. Then this article analyzes and compares the current intelligent solution algorithms for optimal operation of cascade hydropower stations at home and abroad, and finally gives an outlook on the future research about the participation of cascade hydropower in the electricity market. © 2021 IEEE.

关键词： Scheduling

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Advance and Application of Single‑cell Transcriptomics in Auditory Research

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Neuroscience Bulletin 2024年第7期40卷 963-980页

作者： Xiangyu Ma Jiamin Guo Mengyao Tian Yaoyang Fu Pei Jiang Yuan Zhang Renjie Chai State Key Laboratory of Digital Medical Engineering Department of Otolaryngology Head and Neck SurgeryZhongda HospitalSchool of Life Sciences and TechnologyAdvanced Institute for Life and HealthJiangsu Province High‑Tech Key Laboratory for Bio‑Medical ResearchSoutheast UniversityNanjing 210096China Department of Psychiatry Affiliated Hangzhou First People’s HospitalZhejiang University school of MedicineHangzhou 310030China Department of Otolaryngology Head and Neck Surgery Affiliated Drum Tower Hospital of Nanjing University Medical SchoolJiangsu Provincial Key Medical Discipline(Laboratory)NanjingChina Research Institute of Otolaryngology Nanjing 210008China Department of Otolaryngology Head and Neck Surgery Sichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengdu 610072China Co‑Innovation Center of Neuroregeneration Nantong UniversityNantong 226001China Institute for Stem Cell and Regeneration Chinese Academy of ScienceBeijing 101408China Beijing Key Laboratory of Neural Regeneration and Repair Capital Medical UniversityBeijing 100069China

Hearing loss and deafness,as a worldwide disability disease,have been troubling human ***,the auditory organ of the inner ear is highly heterogeneous and has a very limited number of cells,which are largely uncharacterized in ***,with the development and utilization of single-cell RNA sequencing(scRNA-seq),researchers have been able to unveil the complex and sophisticated biological mechanisms of various types of cells in the auditory organ at the single-cell level and address the challenges of cellular heterogeneity that are not resolved through by conventional bulk RNA sequencing(bulk RNAseq).Herein,we reviewed the application of scRNA-seq technology in auditory research,with the aim of providing a reference for the development of auditory organs,the pathogenesis of hearing loss,and regenerative *** about spatial transcriptomic scRNA-seq,single-cell based genome,and Live-seq technology will also be discussed.

关键词： Single-cell RNA sequencing Inner ear Cochlear Auditory sensory epithelium Spiral ganglion neuron

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Composite Graphite Bipolar Plates Under Different Working Conditions 6

Composite Graphite Bipolar Plates Under Different Working Co...

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6th International Conference on Mechanical, Electrical and Material Application, MEMA 2023

作者： Yue, Luo Zhang, Gaoqun Liu, Xiaotong Deng, Zhanfeng Xu, Guizhi Chang, Liang Huang, Yao Hu, Xiao Song, Jie State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Chang-ping District Beijing102209 China School of Energy Power and Mechanical Engineering North China Electric Power University Beijing102206 China

This study uses the molding method to prepare composite graphite bipolar plates to improve the corrosion resistance and electrical conductivity of fuel cell bipolar plates, improve the conversion efficiency and service life, and test their environmental adaptability under different working conditions. In this experiment, the fuel cell test system (850e) is used to test the voltage change curve and power density change curve of the proton exchange membrane fuel cell (PEMFC). Under 200 KPa, the voltage of the fuel cell at a current density of 1000 mA/cm2 is 0.719 V. The power density reaches the maximum at 1540 mA/cm2 current density, which is 911 mW/cm 2. The radii of the three curves from 0.1 A/cm2 to 0.5 A/cm2 decrease with the increase of current density. This indicates that at the beginning, the greater the current density is, the smaller the mass transfer resistance inside the fuel cell is, and the smaller the electron transfer resistance during the electrochemical reaction is. However, when the current density increases to 1 A/cm2, the power density of the fuel cell increases slowly. In the 12-hour constant current density test, it is found that the fuel cell voltage dropped from 0.641 V to 0.611 V, and the rate of decline was 2.5 mV/h, proving that the overall performance of the fuel cell is relatively stable. The graphite bipolar plate prepared by the molding method has good adaptability under different working conditions, and the comprehensive performance is stable under long-term testing. © Published under licence by IOP Publishing Ltd.

关键词： Corrosion resistance

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A multi-targeting drug design strategy for identifying potent anti-SARS-CoV-2 inhibitors

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中国药理学报（英文版） 2022年第2期43卷 483-493页

作者： Peng-xuan Ren Wei-juan Shang Wan-chao Yin Huan Ge Lin Wang Xiang-lei Zhang Bing-qian Li Hong-lin Li Ye-chun Xu Eric H.Xu Hua-liang Jiang Li-li Zhu Lei-ke Zhang Fang Bai School of Life Science and Technology and Shanghai Institute for Advanced Immunochemical StudiesShanghaiTech UniversityShanghai 201210China State Key Laboratory of Virology Wuhan Institute of VirologyCenter for Biosafety Mega-ScienceChinese Academy of SciencesWuhan 430071China CAS Key Laboratory of Receptor Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China State Key Laboratory of Bioreactor Engineering Shanghai Key Laboratory of New Drug DesignSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China School of Life Science and Technology and Shanghai Institute for Advanced Immunochemical StudiesShanghaiTech UniversityShanghai 201210China Department of Chemistry Imperial College LondonLondonUnited Kingdom CAS Key Laboratory of Receptor Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China University of Chinese Academy of Sciences Beijing 100049China School of Life Science and Technology and Shanghai Institute for Advanced Immunochemical StudiesShanghaiTech UniversityShanghai 201210China CAS Key Laboratory of Receptor Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China University of Chinese Academy of Sciences Beijing 100049China

The COVID-19,caused by SARS-CoV-2,is threatening public health,and there is no effective *** this study,we have implemented a multi-targeted anti-viral drug design strategy to discover highly potent SARS-CoV-2 inhibitors,which simultaneously act on the host ribosome,viral RNA as well as RNA-dependent RNA polymerases,and nucleocapsid protein of the virus,to impair viral translation,frameshifting,replication,and *** by this strategy,three alkaloids,including lycorine,emetine,and cephaeline,were discovered to inhibit SARS-CoV-2 with EC50 values of low nanomolar levels *** findings in this work demonstrate the feasibility of this multi-targeting drug design strategy and provide a rationale for designing more potent anti-virus drugs.

关键词： SARS-CoV-2 inhibitors RdRp host ribosome Virus RNA

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A Novel Station-Wide Area Information Interaction Intelligent System

A Novel Station-Wide Area Information Interaction Intelligen...

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7th IEEE International Conference on Industrial engineering and Applications, ICIEA 2020

作者： Jin, Neng Lin, Xiang-Ning Li, Zheng-Tian Rong, Zi-Rui Zhang, Pei-Fu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wu Han China

ISBN: (纸本)9781728167855

Wide area differential protection (WADP) is verified to have many advantages over local protection. However, it is rarely applied in the field due to its high requirement to the communication network bandwidth. To deal with this problem, on the basis of the service oriented architecture of the internet cloud computing model, a novel station-wide area information interaction intelligent system is proposed. Within the system, the station-area intelligent unit with signal processing ability is taken as terminal and initiates request, while the wide area protection layer is taken as cloud platform and provides fast response service for WADP. The simulation results verify that the proposed intelligent system has high adaptability to the low-quality communication networks with limited bandwidth. © 2020 IEEE.

关键词： Wide area networks

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Vibration suppression of magnetic bearing system based on active disturbance rejection control with generalized integrator extend state observer 1

Vibration suppression of magnetic bearing system based on ac...

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

作者： Sun, Hongbo Jiang, Dong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Vibration is a common problem in rotating machine. Active Magnetic Bearing (AMB) produces controllable magnetic force to levitate rotor and the control algorithm contributes to reduce vibration. This paper proposes a vibration suppression strategy based on active disturbance rejection control (ADRC). ADRC applies extend state observer (ESO) to estimate generalized disturbance. However, in AMB system, disturbance is mainly caused by centrifugal force, whose frequency is rotating frequency. For sinusoidal disturbance, ESO cannot estimate it absolutely. To estimate sinusoidal disturbance in AMB system, generalized integrator ESO (GI-ESO) is applied in ADRC. The resonant frequency of GI is set as rotating frequency. Transfer function of error of GI-ESO is analyzed and notch feature at resonant frequency is displayed. The transfer function of third-order of ADRC applied GI-ESO is obtained. Stability of proposed vibration suppressing strategy is analyzed by root locus. Results of simulations show better effect for sinusoidal disturbance estimation of GI-ESO. After applying ADRC based on GI-ESO, vibration of displacement in AMB system is reduced effectively, which shows the effectiveness of proposed vibration suppressing strategy. © 2020 IEEE.

关键词： Natural frequencies

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Rapid Conversion of Biomass to N/O Doped Porous Carbons Via One-Step Microwave Carbonization/Activation for Long Cycle-Stable Supercapacitors

SSRN

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SSRN 2024年

作者： Cheng, Yinfeng Chen, Minghui Xia, Kedong Li, Huabo Xu, Guangri Zhao, Zifang Liu, Pengfei Wang, Lei Yang, Li Xinxiang Key Laboratory of Power Battery Key Technology and Resource Recycling Xinxiang Key Laboratory of Optoelectronic Functional Materials and Devices School of Chemistry and Chemical Engineering Henan Institute of Science and Technology Xinxiang453003 China School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan411201 China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China

Biomass derived carbons as electrode materials for supercapacitors have drawn great attention owing to their low cost, high specific areas and abundant surface functional groups, but most of their preparation processes are time-consuming and power-wasting. In this work, we reported a rapid and energy-saving strategy for preparing N/O doped porous carbons derived from loofah sponges for supercapacitors via one-step microwave carbonization/activation. Utilizing KOH as the microwave absorption medium and activator, the microwave carbonization/activation process could be completed within 6-12 min. The resulting loofah sponges derived porous carbons demonstrated a high specific capacitance of 294 F∙g-1 at 0.5 A∙g-1 and an outstanding retention rate of 74.8% at 20 A∙g-1. The fabricated symmetric supercapacitor based on the as-prepared carbon materials displayed a comparable energy density of 6.67 Wh∙kg-1 at the power density of 100 W∙kg-1. Notably, a remarkable long-term cyclic stability by retaining of 95.2% of its initial capacitance was acquired after 60,000 cycles. Our research not only fabricates sustainable electrode materials for supercapacitors but also provides a fast and energy efficient route for producing biomass derived carbon materials with high capacitive performances for commercial applications. © 2024, The Authors. All rights reserved.

关键词： Carbonization

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Multi-action self-healing coatings with simultaneous recovery of corrosion resistance and adhesion strength

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Journal of Materials Science & technology 2022年第6期101卷 18-27页

作者： Chenhao Ren Yao Huang Wenkui Hao Dawei Zhang Xiejing Luo Lingwei Ma Jinke Wang Thee Chowwanonthapunya Chaofang Dong Xiaogang Li Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co.Ltd.) Beijing 100083China Faculty of International Maritime Studies Kasetsart UniversitySriracha Campus199 TungsuklaSrirachaChonburi 20230Thailand BRI Southeast Asia Network for Corrosion and Protection(MOE) Shunde Graduate School of University of Science and Technology BeijingFoshan 528300China

In this study, a new self-healing strategy that can simultaneously recover the corrosion resistance and the adhesion strength of coatings was introduced. The coating was based on a shape memory epoxy resin containing ethylene vinyl acetate(EVA) microspheres loaded with Ce(NO_(3))_(3)inhibitors, and was cured at a relatively high temperature to facilitate the fusion of adjacent microspheres for a strengthened self-healing effect. The electrochemical impedance spectroscopy(EIS) and scanning electrochemical microscopy(SECM) results demonstrated that the shape memory effect of epoxy matrix, the filling of molten EVA microspheres as well as the release of Ce(NO_(3))_(3)inhibitors contributed synergistically to suppress the corrosion reaction at the coating damage. After healing, the low frequency impedance modulus of the coatings containing Ce(NO_(3))_(3)-EVA microspheres was three orders of magnitude higher than that of the blank epoxy coating. The adhesion strength of the coatings containing Ce(NO_(3))_(3)-EVA microspheres on the metal substrate was also largely repaired thanks to the strong bonding effect of the EVA microspheres.

关键词： Self-healing coating Corrosion protection Adhesion strength Shape memory effect Bonding effect

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Torque Calculation of PMa-SynRM Using the Magnetic Equivalent Circuit 4

Torque Calculation of PMa-SynRM Using the Magnetic Equivalen...

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4th IEEE Student Conference on Electric Machines and Systems, SCEMS 2021

作者： Ling, Zaixun Shuai, Kang Cheng, Cheng Chen, Hao Zheng, Jingwen Wang, Jin State Grid Hubei Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665436816

This paper proposes a torque analysis method for the design of PMa-SynRM. Firstly, an analytical model of the multilayer flux barrier structure of the rotor is established based on the magnetic equivalent circuit. To improve the calculation accuracy of the model, the effects of stator slotting and rotor magnetic bridge saturation are considered. Then, the analytical expression of the air gap flux density is derived and the output torque of the motor is calculated by the Lorentz force law, and the analysis results are verified by the finite element method. Finally, the torque performance of the motor under different flux barrier structures is compared through the analysis model. © 2021 IEEE.

关键词： Timing circuits

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