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The enhanced aerosol deposition by bipolar corona discharge arrays

Plasma Science and technology 2021年第6期23卷 83-88页

作者： Jiacheng LI Zhongzheng HUANG Dawei LIU Kuanlei ZHENG State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China School of Electrical and Information Engineering Wuhan Institute of TechnologyWuhan 430205People’s Republic of China

The corona discharges provide an efficient way to induce precipitation or eliminate fog by increasing ion density in the open *** this paper,one bipolar corona discharge array(positive and negative high voltage coupled simultaneously)which can generate high densities of positive and negative ions is *** comparison between bipolar corona discharge array and unipolar corona discharge array(positive or negative coupled only)indicates that bipolar corona discharge array can generate~3 times higher ion density than unipolar corona discharge *** charged aerosols are produced through collisions between ions and *** collision rate between aerosols is increased substantially by the attractive forces between positively and negatively charged *** deposition of aerosols induced by bipolar discharges is 25.7%higher than that of unipolar discharges at the humidity super-saturation ***,the bipolar corona discharge system is a new option for the large scale ion sources used for artificial weather modification.

关键词： corona discharges charged aerosols bipolar discharges

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ToPoFM: Topology-Guided Pathology Foundation Model for High-Resolution Pathology Image Synthesis with Cellular-Level Control

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IEEE Transactions on Medical Imaging 2025年 PP卷 PP页

作者： Li, Jingxiong Zhu, Chenglu Zheng, Sunyi Chen, Pingyi Sun, Yuxuan Li, Honglin Yang, Lin Zhejiang University College of Computer Science and Technology Hangzhou310027 China Westlake University School of Engineering Hangzhou310024 China Tianjin Medical University Cancer Institute and Hospital National Clinical Research Center for Cancer Tianjin's Clinical Research Center for Cancer State Key Laboratory of Druggability Evaluation and Systematic Translational Medicine Tianjin Key Laboratory of Digestive Cancer Key Laboratory of Cancer Prevention and Therapy Department of Radiology Tianjin China Westlake University Artificial Intelligence and Biomedical Image Analysis Lab School of Engineering Hangzhou310024 China Westlake Institute for Advanced Study Institute of Advanced Technology Hangzhou310024 China Muyuan Laboratory Center for Interdisciplinary Research and Innovation Henan Zhengzhou450016 China

Synthetic data generation emerges as a strategy to mitigate data scarcity in digital pathology, where complicated tissue and cellular features are correlated with cancer diagnosis. The synthesis of such visuals, however, suffers from limited inter class diversity and scarcity of cellular annotations. Current methodologies struggle with capturing the broad spectrum of pathology features, causing unpredictable objects and defected fidelity. Moreover, discrepancies in image resolution across developmental and operational phases can amplify the distribution shifts, undermining the precision of diagnosis. To address these challenges, we introduce TOpology guided PathOlogy Foundation Model (ToPoFM), a visual foundation model designed for the synthesis of high-resolution pathology images with cellular-level control. Our approach integrates a topology-informed cell arrangement generator to steer large language models for crafting synthetic cell arrangements. We correlate cell arrangement guidance with diffusion model for pathology content generation, then further implement a random sliding inference strategy, merging discrete low-resolution samplings into single high-resolution representation. Our model requires only small patches for training. The efficacy of ToPoFM is demonstrated through extensive experiments, complemented by expert validations, showing high fidelity on data synthesis. Additionally, we underscore the utility of our generated imagery as an augmentation tool, enhancing the performance of downstream tasks, including cancer subtype classification and segmentation. © 2025 IEEE.

关键词： Image segmentation

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Multi-UAV Trajectory Generation for Fresh Data Collection: A Diffusion-based Reinforcement Learning Approach

Multi-UAV Trajectory Generation for Fresh Data Collection: A...

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IEEE Conference on Wireless Communications and Networking

作者： Ziping Yu Meng Xiao Yijie Wang Zhongliang Zhao Xianbin Cao Yang Liu Tony Q.S. Quek School of Electronic and Information Engineering Beihang University Beijing China State Key Laboratory of CNS/ATM Beijing China Department of Strategic and Advanced Interdisciplinary Research Peng Cheng Laboratory Shenzhen China Nanyang Technological University Singapore Singapore University of Technology and Design Singapore Yonsei Frontier Lab Yonsei University South Korea

ISBN: (数字)9798350368369

ISBN: (纸本)9798350368376

This paper investigates the trajectory generation problem for multi-unmanned aerial vehicle (UAV)-enabled uplink data collection. Specifically, we minimize the age-of-information (AoI) and maximize the coverage as well as the amount of collected data by planning the multi- UAV trajectory considering the energy consumption and collisions constraints. Motivated by diffusion models' exceptional generative capabilities, we propose a multi-UAV trajectory generation (MUTG) solution based on soft actor-critic and diffusion to solve the optimization problem. A diffusion model-based predictor is designed to obtain the action policy, where a hierarchical graph-transformer network is developed to extract entities' interactive information as a conditional guide for the diffusion. Numerical results verify the effectiveness and superiority compared with benchmark schemes in terms of average AoI, user coverage and data collection ratio.

关键词： Reinforcement learning Data collection Benchmark testing Predictive models Information age Autonomous aerial vehicles Transformers Trajectory Data mining Uplink

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Reliability criterion of film capacitor based on moisture diffusion in encapsulation

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High Voltage 2023年第6期8卷 1242-1252页

作者： Zheng Li Hua Li Tian Qiu Fuchang Lin Yucheng Wang School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Key Laboratory of Pulsed Power Technology Ministry of EducationWuhanChina

The current reliability criterion(RC)of the film capacitor(FC)is usually a fixed value,which does not consider the staged capacitance loss caused by moisture diffusion under high temperature and/or high *** expected lifetime of capacitors would deviate far from the actual *** moisture diffusion process of the encapsulated FC is ana-lysed based on Fick's second *** order to investigate the capacitance loss and moisture diffusion characteristics,4 types of film capacitors are stressed with AC voltage under different temperatures and *** on the staged analysis of the capacitance and weight gain curves,the effect of moisture diffusion on capacitance loss is *** indicate that the linear stage of capacitance loss corresponds to the Fickian moisture diffusion stage of weight *** effect of voltage on FC aging is the most *** capacitance loss rate increases by 301%when the voltage rises by 30%.An RC calculation method of the FC is further proposed,which could also screen the encap-sulation quality and shorten the aging test duration by at least 80%.

关键词： aging moisture diffusion

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Ductilization of 2.6-GPa alloys via short-range ordered interfaces and supranano precipitates

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Science (New York, N.Y.) 2025年第6732期387卷 401-406页

作者： Yan, Yong-Qiang Cha, Wen-Hao Liu, Sida Ma, Yan Luan, Jun-Hua Rao, Ziyuan Liu, Chang Shan, Zhi-Wei Lu, Jian Wu, Ge Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) Hysitron Applied Research Center in China (HARCC) and Center for Alloy Innovation and Design (CAID) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an China Laboratory for Multiscale Mechanics and Medical Science SV LAB School of Aerospace Xi'an Jiaotong University Xi'an China Faculty of Georesources and Materials Engineering RWTH Aachen University Aachen Germany Department of Materials Science and Engineering Delft University of Technology Delft Netherlands Inter-University 3D Atom Probe Tomography Unit Department of Mechanical Engineering City University of Hong Kong Hong Kong China Max Planck Institute for Sustainable Materials Düsseldorf Germany National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong University Shanghai China Centre for Advanced Structural Materials Department of Materials Science and Engineering City University of Hong Kong Hong Kong China

Higher strength and higher ductility are desirable for structural materials. However, ultrastrong alloys inevitably show decreased strain-hardening capacity, limiting their uniform elongation. We present a supranano (<10 nanometers) and short-range ordering design for grain interiors and grain boundary regions, respectively, in fine-grained alloys based on vanadium, cobalt, and nickel, with additions of tungsten, copper, aluminum, and boron. The pronounced grain boundary-related strengthening and ductilization mechanism is realized through segregation of the short-range ordering near the grain boundary. Furthermore, the supranano ordering with a larger size has an enhanced pinning effect for dislocations and stacking faults, multiplied and accumulated in grain interiors during plastic deformation. These mechanisms promote continuously increased flow stress until fracture of the alloy at 10% strain with 2.6-gigapascal tensile stress.

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Phase–amplitude model for doubly fed induction generators

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 369-379页

作者： Hua HUANG Ping JU Xueping PAN Yuqing JIN Xiaoming YUAN Yuan GAO State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China

The doubly fed induction generator(DFIG) is major type of wind turbine generator used in grid-connected wind farms. Practical models of DFIG have been built to study the influence of wind power generation on power system dynamics. However, most existing practical models of the DFIG are based on rectangular coordinates,in which frequency variation is neglected. In this paper, a phase-amplitude(P-A) model is proposed for a DFIG based on phase and amplitude of the internal voltage. The model structure is much like that of the synchronous generator, and the rotor voltage can manipulate both the amplitude and the phase of the internal *** have been made between the new P-A model of the DFIG and the synchronous generator model,as well as the asynchronous motor *** contributions of the new P-A model of the DFIG are discussed and it is demonstrated that the proposed model has better ability in describing power system dynamic phenomena such as voltage dynamics and structural dynamics. Simulation results and a field test validate these contributions.

关键词： Doubly fed induction generator(DFIG) Model Internal voltage Voltage dynamics Frequency dynamics

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Degradation of target pollutants under simultaneous competition from coexisting compounds: Electron-beam treatment of a real hair dye wastewater

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Radiation Physics and Chemistry 2025年 236卷

作者： Qiburi Bao Boming Yu Wangrui Li Miao Yang Zhen Dong Long Zhao School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

Water pollution resulting from the extensive production and consumption of hair dyes has been threatening human health and aquatic ecosystems globally. Gaining knowledge on the presence of compounds in real hair dye wastewater and developing efficient treatment are emerging issues. This paper studies the electron beam irradiation of a real hair dye industrial wastewater. The COD Cr of the industrial wastewater was reduced by 35 % through EB irradiation at 9 kGy. Four dyestuff intermediates (phenol, 5-amino- o -cresol, 5-amino-4-chloro- o -cresol and 5-amino-6-chloro- o -cresol) were identified as the target pollutants through compositional analysis of the wastewater. The removals of target pollutants in single-component solutions reached 75.7 %–89.7 % at 9 kGy The influence of coexisting background components on the degradation of targets was investigated and the interaction between different targets was evaluated during the irradiation treatment. Compared with pure single solutions, the required doses for 50 % removal of the targets in the wastewater increased by 0.1–5.8 times. Quantitative assessment of the competing effects of non-target components and the selectivity of reactive species is performed. OH and O 2 − show much lower selectivity toward the targets than reducing radicals (e aq − and H). Among them, O 2 − exhibits the lowest selectivity toward phenol with a log f value of −0.51. The main breakdown products of the target pollutants are quinones, diphenols and carboxylic acids.

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Observation of charge to spin conversion in p-orbital InBi alloy

arXiv

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arXiv 2025年

作者： Li, Gen Zhang, Ying Xu, Xiaoguang Shen, Lei Feng, Zheng Meng, Kangkang Li, Ang Cheng, Lu He, Kang Tan, Wei Wu, Yong Wu, Yihong Jiang, Yong Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of Education School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Research Institute Chongqing Liang Jiang New Area Chongqing401123 China Department of Mechanical Engineering National University of Singapore 117575 Singapore Microsystem & Terahertz Research Center CAEP Chengdu610200 China Faculty of Materials and Manufacturing Beijing Key Lab of Microstructure and Properties of Advanced Materials Beijing University of Technology Beijing100124 China Institute of Quantum Materials and Devices School of Electronic and Information Engineering State Key Laboratory of Separation Membranes and Membrane Processes Tiangong University Tianjin300387 China

High density data storage and spin-logic devices require highly efficient all-electric control of spin moment. So far, charge-to-spin conversion through the spin Hall effect limits to d-orbital materials associated with strong spin-orbit coupling, especially heavy metals. However, d-orbital heavy metals with strong spin-orbit coupling results in a short spin diffusion length, which restricts the spin transport and accumulation in spintronic devices. Therefore, the conflict between charge-to-spin conversion efficiency and spin transport ability is irreconcilable in d-orbital materials. Here, we report a large charge to spin conversion experimentally observed in the p-orbital In2Bi alloy, exhibiting the coexistence of a large spin Hall angle comparable to heave metal Pt and a long spin diffusion length (4 times that of Pt). First-principles calculations reveal that topological symmetry-protected gap opening near the Fermi level results in large Berry curvature-related spin Hall conductivity. Due to the delocalized nature of p-orbitals and semimetal properties of In2Bi, its spin current can overcome the physical barriers between spin Hall angle and spin diffusion length in d-orbital metals, thereby advancing the development of high-performance spintronic devices. Copyright © 2025, The Authors. All rights reserved.

关键词： Heavy metals

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Research on DC voltage control strategies for typical four-terminal HVDC system

Research on DC voltage control strategies for typical four-t...

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2013 2nd International Conference on Sustainable Energy and Environmental engineering, ICSEEE 2013

作者： Wang, Kai Sun, Hai Shun Hua, Yu Liu, Yuan Lin, Wei Xing Li, Cheng Hao State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038350217

The continuous development of alternative energy has put forward higher requirement for electricity transmission. To cope with its fluctuation characteristics, high voltage direct current (HVDC) technology has received more attention. Voltage Source Converter (VSC) based Multi-Terminal High Voltage Direct Current (MTDC) represents the future trend of HVDC technology. This paper mainly focuses on the control strategies of a four-terminal VSC based MTDC power transmission system. The operation characteristic of the system was studied, and the proposed two control strategies, master-slave control strategy and DC voltage droop control strategy, were verified through simulations. The latter control strategy was proved to be performing well under various conditions, including converter station disconnection and faults at AC side of the converter. © (2014) Trans Tech Publications, Switzerland.

关键词： HVDC power transmission

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High-rate sodium metal batteries enabled by trifluormethylfullerene additive

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Nano Research 2022年第8期15卷 7172-7179页

作者： Pengju Li Xiaobo Huang Zhipeng Jiang Han Zhang Pengwei Yu Xing Lu Jia Xie State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Sodium metal is a promising anode for sodium batteries due to its high theoretical capacity and low ***,the serious Na dendrite growth and low Coulombic efficiency,especially at high current densities/cycling capacities,severely limit the application of sodium metal ***,trifluoromethylfullerene,C_(60)(CF_(3))_(6),is designed as an electrolyte additive to enable the high-rate cycling of sodium metal anodes with high Coulombic *** CF3 groups contribute to the formation of stable NaF-rich solid electrolyte interface layer,while C_(60)cages induce the uniform distribution of sodium ions and promote the formation of smooth and compact ***,Na||Cu cell with C_(60)(CF_(3))_(6)can be cycled at 2 mA·cm^(−2)and 10 mAh·cm^(−2)over 180 cycles with an average Coulombic efficiency of 99.9%,and Na||Na cell can be cycled at 10 mA·cm^(−2)over 600 ***,Na||NaV2(PO_(4))_(3)@C full cell exhibits high capacity retention of 84%over 2,000 cycles at 20 C(~3 mA·cm^(−2)).

关键词： sodium metal anode fullerene trifluormethylfullerene high rate electrolyte additive

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