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International Conference on Industrial Artificial Intelligence (IAI)

作者： Yating Fu Junhao Tian Hui Yang State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong University Nanchang China Key Laboratory of Advanced Control and Optimization of Jiangxi Province East China Jiaotong University Nanchang China School of Electrical and Automation Engineering East China Jiaotong University Nanchang China

In order to meet the operational requirements of the high-speed train in terms of safety, accuracy and smoothness, an adaptive backstepping sliding mode control approach based on fuzzy regulation is put forward in this paper. Firstly, to solve the problem of insufficient accuracy of the single point model, this paper establishes a mass point dynamics model of the high-speed train and sets a compensation term for the model considering the uncertainties in the operation process. Secondly, the adaptive law is designed to estimate the compensation term and the new backstepping sliding mode control strategy is developed. Finally, fuzzy rules are designed to adjust the switching gain of the sliding mode term to suppress jitter. The results of simulation and comparison experiments demonstrate the effectiveness and feasibility of the proposed modeling and control method.

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Ferroelectrically tunable topological phase transition in In2Se3 thin films

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Physical Review B 2024年第8期109卷 085432-085432页

作者： Zhiqiang Tian Ziming Zhu Jiang Zeng Chao-Fei Liu Yurong Yang Anlian Pan Mingxing Chen Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education School of Physics and Electronics Hunan Normal University Changsha 410081 China School of Physics and Electronics Hunan University Changsha 410082 People's Republic of China School of Science Jiangxi University of Science and Technology Ganzhou 341000 China National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials Science and Engineering Hunan University Changsha 410082 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

Materials with ferroelectrically switchable topological properties are of interest for both fundamental physics and practical applications. Using first-principles calculations, we find that stacking ferroelectric α−In2Se3 monolayers into a bilayer leads to polarization-dependent band structures, which yields polarization-dependent topological properties. Specifically, we find that the states with interlayer ferroelectric couplings are quantum spin Hall insulators, while those with antiferroelectric polarizations are normal insulators. We further find that In2Se3 trilayer and quadlayer exhibit nontrivial band topology as long as in the structure the ferroelectric In2Se3 bilayer is antiferroelectrically coupled to In2Se3 monolayers or other ferroelectric In2Se3 bilayer. Otherwise the system is topologically trivial. The reason is that near the Fermi level the band structure of the ferroelectric In2Se3 bilayer has to be maintained for the nontrivial band topology. This feature can be used to design nontrivial band topology for the thicker films by a proper combination of the interlayer polarization couplings. The topological properties can be ferroelectrically tunable using the dipole locking effect. Our study reveals switchable band topology in a family of natural ferroelectrics, which provide a platform for designing new functional devices.

关键词： Ferroelectricity Topological materials 2-dimensional systems First-principles calculations

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Doping-induced metal–N active sites and bandgap engineering in graphitic carbon nitride for enhancing photocatalytic H_(2 )evolution performance

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Chinese Journal of Catalysis 2022年第2期43卷 421-432页

作者： Xiaohui Yu Haiwei Su Jianping Zou Qinqin Liu Lele Wang Hua Tang Engineering Institute of Advanced Manufacturing and Modern Equipment Technology Jiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063JiangxiChina School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina School of Environmental Science and Engineering Qingdao UniversityQingdao 266071ShandongChina

Durable and inexpensive graphitic carbon nitride(g-C_(3)N_(4))demonstrates great potential for achieving efficient photocatalytic hydrogen evolution reduction(HER).To further improve its activity,g-C_(3)N_(4)was subjected to atomic-level structural engineering by doping with transition metals(M=Fe,Co,or Ni),which simultaneously induced the formation of metal-N active sites in the g-C_(3)N_(4)framework and modulated the bandgap of g-C_(3)N_(4).Experiments and density functional theory calculations further verified that the as-formed metal-N bonds in M-doped g-C_(3)N_(4)acted as an"electron transfer bridge",where the migration of photo-generated electrons along the bridge enhanced the efficiency of separation of the photogenerated charges,and the optimized bandgap of g-C_(3)N_(4)afforded stronger reduction ability and wider light *** a result,doping with either Fe,Co,or Ni had a positive effect on the HER activity,where Co-doped g-C_(3)N_(4)exhibited the highest *** findings illustrate that this atomic-level structural engineering could efficiently improve the HER activity and inspire the design of powerful photocatalysts.

关键词： g-C_(3)N_(4) Photocatalytic H_(2)generation Metal-N active sites Transition metal doping Band gap engineering

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Experimental study of core and edge fluctuations by reflectometry on EAST tokamak

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Plasma Science and Technology 2021年第7期23卷 8-14页

作者： Zhen ZHOU Tao ZHANG Mingfu WU Kaixuan YE Fubin ZHONG Jia HUANG Kangning GENG Yukai LIU Gongshun LI Haoming XIANG Yumin WANG Fei WEN Sanqiu LIU Jiangxi Province Key Laboratory of Fusion and Information Control Institute of Fusion Energy and Plasma ApplicationDepartment of PhysicsNanchang UniversityNanchang 330031People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People’s Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 5180602People’s Republic of China

An eight-channel poloidal correlation reflectometer(PCR)with O-mode polarization has been installed in the EAST tokamak to measure the fluctuations from core to *** PCR launches eight different frequency microwaves(20.4,24.8,33,40,42.4,48,52.6,57.2 GHz)into the plasma from the low field side and two poloidally separated antennae are used to receive the reflected *** a result,the diagnostic can measure fluctuations in eight(radial)×two(poloidal)spatial *** diagnostic has been applied to study the core and edge pedestal fluctuations during an inter-ELM phase in H-mode *** inter-ELM phase can be divided into two *** the first stage,a low frequency(<50 kHz)broadband fluctuation dominates in the pedestal gradient *** the second stage,this fluctuation is strongly suppressed and quasi-coherent fluctuations(QCFs)*** QCF’s amplitude increases with the pedestal density gradient,implying density gradient driven *** the core fluctuations inside the pedestal show no evident changes during the inter-ELM phase.

关键词： core fluctuation edge fluctuation reflectometry

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A Large-Scale Plant in Treating Young Landfill Leachate: Focusing on the Application of Dopamine Modified Ceramic Membrane Smbr and Change of Nitrifying and Denitrifying Bacteria

SSRN

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SSRN 2024年

作者： Wang, Cong Wu, Hanyang Han, Runlin Zhang, Shujun Ni, Shou-Qing Li, Weicheng Qi, Weikang Peng, Yongzhen National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Beijing University of Technology Beijing100124 China Jiangxi Bocent Advanced Ceramic Environmental Technology Co. Ltd Jiangxi Province Pingxiang337000 China School of Chemistry and Chemical Engineering Jinggangshan University Ji'an343009 China Beijing Drainage Group Co. Ltd. Beijing100044 China Shandong Key Laboratory of Environmental Processes and Health Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Shandong Qingdao266237 China

A combined DAF-UASB-A/O system plus ceramic membrane submerged MBR (SMBR) was conducted in treating young landfill leachate with a capacity of 300 m3 /day. The degradation efficiency in biological unit and membrane filtration within 185 days of operation was investigated partly for the pollutant’s abatement and partly for high quality of permeate for UF/RO treatment as final tertiary treatment. A substantial reduced number of COD (96.8%), ammonia (83.4%) and TN (79.6%) was gained via DAF-UASB -A/O system. The dopamine modified ceramic membrane can enable SMBR to operate average 28 LMH because of good surface hydrophilicity. The dopamine modified ceramic membrane SMBR was fouling-free MBRs because immersed chemical cleaning can recover the filterability of ceramic membrane. Interestingly, enrichment of some species with the prolong of the successive anaerobic-anoxic-aerobic treatment system was companied with severe or slight suppression of other species via comparative study in sludge Day-1 and Day-185, respectively. Regarding the nitrifying and denitrifying microorganisms, simultaneous methanogensis and denitrification (SMD) process can be confirmed in the UASB because of the Thauera identified. The presence of Planctomycetes suggested anaerobic ammonium oxidation (ANAMMOX) process happened in the A/O tank. © 2024, The Authors. All rights reserved.

关键词： Ammonia

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Ferroelectrically tunable topological phase transition in In2Se3 thin films

arXiv

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arXiv 2024年

作者： Tian, Zhiqiang Zhu, Ziming Zeng, Jiang Liu, Chao-Fei Yang, Yurong Pan, Anlian Chen, Mingxing Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education School of Physics and Electronics Hunan Normal University Changsha410081 China School of Physics and Electronics Hunan University Changsha410082 China School of Science Jiangxi University of Science and Technology Ganzhou341000 China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials Science and Engineering Hunan University Changsha410082 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China

Materials with ferroelectrically switchable topological properties are of interest for both fundamental physics and practical applications. Using first-principles calculations, we find that stacking ferroelectric α-In2Se3 monolayers into a bilayer leads to polarization-dependent band structures, which yields polarization-dependent topological properties. Specifically, we find that the states with interlayer ferroelectric couplings are quantum spin Hall insulators, while those with antiferroelectric polarizations are normal insulators. We further find that In2Se3 trilayer and quadlayer exhibit nontrivial band topology as long as in the structure the ferroelectric In2Se3 bilayer is antiferroelectrically coupled to In2Se3 monolayers or other ferroelectric In2Se3 bilayer. Otherwise the system is topologically trivial. The reason is that near the Fermi level the band structure of the ferroelectric In2Se3 bilayer has to be maintained for the nontrivial band topology. This feature can be used to design nontrivial band topology for the thicker films by a proper combination of the interlayer polarization couplings. The topological properties can be ferroelectrically tunable using the dipole locking effect. Our study reveals switchable band topology in a family of natural ferroelectrics, which provide a platform for designing new functional devices. © 2024, CC BY.

关键词： Topology

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Asymptotic state estimation for linear systems with sensor and actuator faults

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Science China(Information Sciences) 2019年第11期62卷 106-120页

作者： Chun-Hua XIE Hui YANG Dianhui WANG Zhe LI School of Electrical and Automation Engineering East China Jiaotong University Key Laboratory of Advanced Control & Optimization of Jiangxi Province Department of Computer Science and Information Technology La Trobe University College of Electrical and Information Engineering Hunan University

This paper investigates the asymptotic state estimation problem for linear systems with sensor and actuator faults, where the faults are modeled via multiple modes. For the case of sensor faults, we first introduce a new notion of detectability, i.e., detectability of system against sensor faults. The notion helps to address the question of whether it is possible to asymptotically estimate the system state by using the control input and system output, irrespective of which mode the system is in and what values the fault signals are.A necessary and sufficient condition for the system to be detectable against sensor faults is given, and then two switched observers are proposed for asymptotic state estimation with the help of maximin strategy. For the system with ? fault modes, we provide the explicit form of the switched observer, which is based on a bank of ?(?+1)/2 Luenberger-like or sliding-mode observers. Furthermore, extensions to the case of sensor and actuator faults are further studied. Finally, a simulation example of a reduced-order aircraft system is provided to show the effectiveness of the proposed approaches.

关键词： asymptotic state estimation observer linear systems sensor faults actuator faults

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Fuzzy H∞Sliding Mode control of Persistent Dwell-Time Switched Nonlinear Systems

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IEEE Transactions on Fuzzy Systems 2022年第12期30卷 5143-5151页

作者： Wang, Jing Wang, Haitao Yan, Huaicheng Wang, Yueying Shen, Hao Anhui University of Technology AnHui Province Key Laboratory of Special Heavy Load Robot The School of Electrical and Information Engineering Ma'anshan243032 China East China University of Science and Technology School of Information Science and Engineering Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education Shanghai200237 China Shanghai University School of Mechatronic Engineering and Automation Shanghai201620 China

In this article, the fuzzy H∞ sliding mode control problem for continuous-time switched nonlinear systems is investigated. The switching signal conforms to the persistent dwell-time switching mechanism. The first objective of this article is to construct a switched integral sliding surface that not only accommodates the switched nonlinear model, but ensures that the sliding mode dynamics are globally uniformly exponentially stable and have an H∞ performance by the equivalent controller derived from the sliding surface. Another aim is to integrate the switched sliding mode control law to force the system trajectories to the sliding surface in a finite amount of time. Then, on the basis of the Lyapunov function technique, the specific form of the sliding mode control law gains is given first, and later the finite-time reachability of the sliding surface is ensured. Finally, the validity of the proposed switched sliding mode control method is validated by a numerical example. © 1993-2012 IEEE.

关键词： Nonlinear systems

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Micro-Helical Ni3fe Chain Encapsulated in Ultralight Mxene/C Aerogel to Realize Multi-Functionality: Radar Stealth, Thermal Insulation, Fire Resistance, and Mechanical Properties

SSRN

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SSRN 2024年

作者： Lin, Sen Lin, Jing Xiong, Zhiqiang He, Xue Li, Xin Liu, Chongbo Wang, Chengying Zeng, Xiaojun Nie, Xuliang Che, Renchao Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle School of Environmental and Chemical Engineering Nanchang Hangkong University Nanchang330063 China School of Materials Science and Engineering Nanchang Hangkong University Nanchang330063 China School of Materials Science and Engineering Jingdezhen Ceramic University Jingdezhen333403 China College of Chemistry and Materials Jiangxi Agricultural University Nanchang330045 China Laboratory of Advanced Materials Department of Materials Science Collaborative Innovation Center of Chemistry for Energy Materials and Collaborative Innovation Center of Chemistry for Energy Materials Fudan University Shanghai200438 China

Owing to their high porosity, ultralow density, and excellent impedance matching, magnetic carbon aerogels are considered to be a promising microwave absorption (MA) material. However, the inevitable agglomeration of traditional magnetic microspheres in carbon materials makes it difficult to realize perfect electromagnetic synergy. In this study, Ni3Fe alloy particles are first assembled into a micro-helical Ni3Fe chain under ethylene glycol polymerization, which are further wrapped by MXene. Then, carbonyl-amine condensation reaction is used for the in-situ growth of poly-Schiff-base aerogels on the independent caterpillar-like Ni3Fe/MXene. Finally, ultralight TiO2/Ni3Fe/MXene/C (NFMC) aerogels are synthesized through calcination treatment. Benefiting from the electromagnetic synergistic effect of multi-dimensional and multi-component materials, the NFMC-7 aerogel exhibits excellent MA performance with a minimum reflection loss of -61.6 dB at 3.0-mm thickness and an effective absorption bandwidth of 8.16 GHz at 2.77-mm thickness under a low filler loading of 7.6 wt.%. Commercial computer simulation technology is used to verify the strong magnetic and dielectric loss characteristics of Ni3Fe chains. Meanwhile, the radar cross-section (RCS) simulation of NFMC-7 aerogels reveals their excellent radar stealth performance with a maximum RCS reduction value of 20.1 dB·m2 at 0° as well as thermal insulation property with a thermal conductivity of 0.046 W/m·K. Notably, the NFMC-7 aerogel is fire-resistant and can withstand nearly 750 times its own weight without damage, which verifies its practical applicability. Overall, this work establishes an effective strategy to fabricate multi-functional magnetic aerogels, which can serve as lightweight, thin, and strong microwave absorbers with broad absorption bandwidth. © 2024, The Authors. All rights reserved.

关键词： Aerogels

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$\mathcal {H}_{\infty }$ State Estimation for PDT-Switched Coupled Neural Networks Under Round-Robin Protocol: A Cooperation-Competition-Based Mechanism

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IEEE Transactions on Network Science and Engineering 2022年第2期10卷 911-921页

作者： Hao Shen Yinsheng Song Jing Wang Ju H. Park AnHui Province Key Laboratory of Special Heavy Load Robot Anhui University of Technology Ma'anshan China Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai China School of Electrical and Information Engineering Anhui University of Technology Ma'anshan China School of Information Science and Engineering East China University of Science and Technology Shanghai China Department of Electrical Engineering Yeungnam University Kyongsan Republic of Korea

This paper is concentrated on the $\mathcal {H_{\infty }}$ state estimation problem for switched coupled neural networks based on a Takagi-Sugeno fuzzy model. Notably, the time-variant network topology with alternate fast switchings and slow ones is described suitably by a persistent dwell-time rule, and the interactive dynamics with both cooperative properties and antagonistic ones among nodes are featured comprehensively by the switching signed graph. In view of the communication pressures brought by network-induced problems and the requirements in digital control, the round-robin protocol and logarithmic quantization are flexibly integrated for more transmission efficiency and fewer data collisions. Thereafter, by utilizing a relaxed multiple Lyapunov function method and some novel matrix process techniques, sufficient criteria guaranteeing the exponential stability in a globally uniform sense with a prescribed $\mathcal {H_{\infty }}$ performance level of the estimation error system are established. Finally, the synthesized analysis of the proposed method is presented with an illustrative example.

关键词： Switches Topology Switching circuits Protocols Neurons State estimation Quantization (signal)

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