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Eigenvector-based analysis of cluster synchronization in general complex networks of coupled chaotic oscillators

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Frontiers of physics 2023年第4期18卷 321-335页

作者： Huawei Fan Ya wang xingang wang School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China

Whereas topological symmetries have been recognized as crucially important to the exploration of synchronization patterns in complex networks of coupled dynamical oscillators,the identification of the symmetries in largesize complex networks remains as a ***,even though the topological symmetries of a complex network are known,it is still not clear how the system dynamics is transited among different synchronization patterns with respect to the coupling strength of the *** propose here the framework of eigenvector-based analysis to identify the synchronization patterns in the general complex networks and,incorporating the conventional method of eigenvalue-based analysis,investigate the emergence and transition of the cluster synchronization *** are able to argue and demonstrate that,without a prior knowledge of the network symmetries,the method is able to predict not only all the cluster synchronization states observable in the network,but also the critical couplings where the states become stable and the sequence of these states in the process of synchronization *** efficacy and generality of the proposed method are verified by different network models of coupled chaotic oscillators,including artificial networks of perfect symmetries and empirical networks of non-perfect *** new framework paves a way to the investigation of synchronization patterns in large-size,general complex networks.

关键词： cluster synchronization complex networks network symmetry coupled oscillators

Chaos synchronization with dual-channel time-delayed couplings

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Science China(Technological Sciences) 2016年第3期59卷 428-435页

作者： FAN HuaWei wang YaFeng CHEN MengJiao wang xingang School of Physics and Information Technology Shaanxi Normal University Institute of Theoretical & Computational Physics Shaanxi Normal University

While the significance of oscillator dynamics and coupling structure to synchronization behaviors has been well addressed in the literature, little attention has been paid to the possible influence of coupling functions. In the present paper, adopting the scheme of dual-channel time-delayed couplings, we investigate how the synchronization behaviors of networked chaotic oscillators are influenced by parameters in the coupling functions. It is found that, with the introduction of the second coupling channel, the synchronization region, as calculated according to the method of master stability function(MSF), can be largely modified. In particular, by a slight change of the time delay, it is found that the synchronization region can be significantly adjusted, or even switched from non-existing to existing. We demonstrate this interesting phenomenon for both situations of processing and propagation induced time delays, as well as for different coupling functions. Our studies shed new light on the mechanism of chaos synchronization, and may potentially be used for the control of complex network dynamics.

关键词： chaos synchronization dual-channel coupling time delay master stability function

Influence of the structure of TiO_2 , CeO_2 , and CeO_2-TiO_2 supports on the activity of Ru catalysts in the catalytic wet air oxidation of acetic acid

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Rare Metals 2011年第5期30卷 488-495页

作者： YANG Shaoxia ZHU Wanpeng wang xingang National Engineering Laboratory for Biomass Power Generation Equipment School of Renewable Energy North China Electric Power University Beijing 102206 China Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

Ru catalysts, supported on TiO 2 , CeO 2 , and CeO 2 -TiO 2 , were prepared by the impregnation method. The effect of the structure of the supports on the activity of Ru catalysts was investigated in the catalytic wet air oxidation （CWAO） of acetic acid under 230℃ and 5 MPa in a batch reactor. Physical properties including the surface area, crystalline phase, and surface components of the Ru catalysts were characterized by N 2 adsorption, X-ray powder diffraction （XRD）, and X-ray photoelectron spectroscopy （XPS）. The CeO 2 -based Ru catalysts had good activity, and the prepared RuO 2 /CeO 2 catalyst showed markedly higher activity than the RuO 2 /CeO 2 -TiO 2 catalyst. The surface structure, the high amount of chemisorbed oxygen on the catalyst surface, and the suitable pH pzc value of the supports played an important role in the activity of the Ru catalysts in CWAO of acetic acid.

关键词： catalytic oxidation catalysts ruthenium ceria acetic acid

Dynamic Reliability Sensitivity of Cemented Carbide Cutting Tool

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Chinese Journal of Mechanical Engineering 2014年第1期27卷 79-85页

作者： wang xingang ZHANG Yimin LI He L Chunmei School of Control and Engineering Northeastern University School of Mechanical Engineering and Automation Northeastern University

Influence of geometric and cutting parameters of cemented carbide cutting tool on reliability of cutting tool has become more and more mature, yet influence of its physical and material parameters on reliability is still blank. In view of this, cutting test and fatigue crack growth test of YT05 cemented carbide cutting tool are conducted to measure such data as the original crack size, growth size, times of impact loading, number and time of cutting tool in failure, and stress distribution of cutting tool is also obtained by simulating cutting process of tools. Mathematical models on dynamic reliability and dynamic reliability sensitivity of cutting tool are derived respectively by taking machining time and times of impact loading into account, thus change rules of dynamic reliability sensitivity to physical and material parameters can be obtained. Theoretical and experimental results show that sensitive degree on each parameter of tools increases gradually with the increase of machining time and times of impact loading, especially for parameters such as fracture toughness, shape parameter, and cutting stress. This proposed model solves such problems as how to determine the most sensitive parameter and influence degree of physical parameters and material parameters to reliability, which is sensitivity, and can provide theoretical foundation for improving reliability of cutting tool system.

关键词： cutting tool dynamic reliability sensitivity critical fatigue stress

Identification of green tea origins by near-infrared (NIR) spectroscopy and different regression tools

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Science China(Technological Sciences) 2017年第1期60卷 84-90页

作者： ZHUANG xingang wang LiLi CHEN Qi WU XueYuan FANG JiaXiong Advanced Research Center for Optics Shandong University Jinan 250100 China School of Information Science and Engineering Shandong University Jinan 250100 China State Key Laboratories of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China State Key Laboratory of Tea and Agricultural Products Detection (Huangshan) Huangshan 245000 China

In this study,near-infrared(NIR) spectroscopy was applied to efficiently and non-destructively identify Shandong green tea origins coupled with three different regression *** results indicated that partial least squares(PLS) had better performance than back propagation artificial neural network(BP-ANN) and support vector machine(SVM).For PLS,the accuracies of identification were up to 100% for both training and *** results sufficiently demonstrate that NIR spectroscopy can be efficiently utilized for the non-destructive identification of green tea origins.

关键词： near-infrared spectroscopy (NIRS) green tea origin regression tool

Robust power control method for wireless sensor networks with static output feedback

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控制理论与应用（英文版） 2012年第1期10卷 44-49页

作者： Dongmei ZHANG xingang wang Jun LIU College of Science Zhejiang University of Technology Hangzhou Zhejiang 310032 China College of Information Engineering Zhejiang University of Technology Hangzhou Zhejiang 310032 China School of Mathematics Beihua University Jilin Jilin 132013 China

This paper proposed distributed strategies for the joint control of power and data rates in a wireless sensor network. By adapting a linear state-space model to describe the network dynamics, the power controller with static output feedback is designed in the case that the transmission signal are not always available and the estimation of the unmeasured states constitutes a crucial task in the network. The existence of the power controller is formulated as the feasibility of the convex optimization problem, which can be solved via a linear matrix inequality （LMI） approach. The proposed algorithm also caters to the uncertainties in the network dynamics. Numerical examples are given to illustrate the effectiveness of the proposed methods.

关键词： Wireless sensor network Power control Static output feedback

Study on multi-timescale operation of hydrogen-containing energy coupled with transportation system

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Clean Energy 2024年第3期8卷 79-94页

作者： xingang wang Zhiyong Yu Jiayu Bian Jin Yu State Grid Xinjiang Electric Power CO LTD.Urumqi830000China State Grid Xinjiang Electric Power Economic and Technology Research Institute Urumqi830000China

With the widespread attention on hydrogen energy,the operation optimization of the coupling system of hydrogen energy and transportation has become a critical ***,this study develops a hydrogen-containing energy transportation coupling system for the system collaborative operation framework,operation mode and equipment modelling of the ***,a medium-to long-term operation optimization model and a short-term operation optimization model were constructed considering the differences in the operation of coupled systems at different timescales and operating costs as the objective function and power balance and system equipment as *** the medium-and long-term operation optimization model,the planning scenario reduction method is used to reduce the wind power generation *** the short-term operation optimization model,a multivariate uncertainty model is constructed to represent the uncertainty in the coupling ***,the solution method of the model is ***,a coupled system is simulated to verify the effectiveness of the model.(i)When the initial scene set is 600,the typical scene reduction method using Latin hypercube sampling and the Wasserstein distance can reduce operating costs by 7.60%and 9.49%compared with K-means reduction and K-media reduction methods.(ii)The sensitivity coefficients of hydrogen sales price,electricity sales price and maintenance rate to operating costs are-0.031%,-1.009%and 0.0105%,respectively.(iii)Considering multiple uncertainties can help make optimal decisions based on the overall consideration of disadvantage scenarios,thereby reducing system operating costs.

关键词： hydrogen-containing energy system transportation system multi-timescale operation optimization

Nanosilver alleviates foreign body reaction and facilitates wound repair by regulating macrophage polarization

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2023年第6期24卷 510-523页

作者： Chuangang YOU Zhikang ZHU Shuangshuang wang xingang wang Chunmao HAN Huawei SHAO Department of Burns&Wound Care Center the Second Afiliated HospitalZhejiang University School of MedicineHangzhou 310009China Department of Burns the First People's Hospital of WenlingWenling 317500China

Foreign body reactions induced by macrophages often cause delay or failure of wound healing in the application of tissue engineering *** study explores the application of nanosilver(NAg)to reduce foreign body reactions during scaffold *** NAg hybrid collagen-chitosan scaffold(NAg-CCS)was prepared using the freeze-drying *** NAg-CCS was implanted on the back of rats to evaluate the effects on foreign body *** tissue samples were collected for histological and immunological evaluation at variable *** pigs were used to assess the effects of NAg on skin wound *** wounds were photographed,and tissue samples were collected for molecular biological analysis at different time points ***-CCS has a porous structure and the results showed that it could release NAg constantly for two *** NAg-CCS group rarely developed a foreign body reaction,while the blank-CCS group showed granulomas or necrosis in the subcutaneous grafting *** matrix metalloproteinase-1(MMP-1)and tissue inhibitor of metalloproteinase-1(TIMP-1)were reduced significantly in the NAg-CCS *** NAg-CCS group had higher interleukin(IL)-10 and lower IL-6 than the blank CCS *** the wound healing study,M1 macrophage activation and inflammatory-related proteins inducible nitric oxide synthase(iNOS),IL-6,and interferon-(IFN-)were inhibited by *** contrast,M2 macrophage activation and proinflammatory proteins(arginase-1),major histocompatibility complex-II(MHC-II),and found in inflammatory zone-1(FIZZ-1)were promoted,and this was responsible for suppressing the foreign body responses and accelerating wound *** conclusion,dermal scaffolds containing NAg suppressed the foreign body reaction by regulating macrophages and the expression of inflammatory cytokines,thereby promoting wound healing.

关键词： Nanosilver Macrophages Implants Foreign body reaction Wound repair

Synchronization within synchronization: transients and intermittency in ecological networks

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National Science Review 2021年第10期8卷 23-32页

作者： Huawei Fan Ling-Wei Kong xingang wang Alan Hastings Ying-Cheng Lai School of Physics and Information Technology Shaanxi Normal University School of Electrical Computer and Energy Engineering Arizona State University Department of Environmental Science and Policy University of California Santa Fe Institute Department of Physics Arizona State University

Transients are fundamental to ecological systems with significant implications to management,conservation and biological control. We uncover a type of transient synchronization behavior in spatial ecological networks whose local dynamics are of the chaotic, predator–prey type. In the parameter regime where there is phase synchronization among all the patches, complete synchronization(i.e. synchronization in both phase and amplitude) can arise in certain pairs of patches as determined by the network symmetry—henceforth the phenomenon of ‘synchronization within synchronization.’ Distinct patterns of complete synchronization coexist but, due to intrinsic instability or noise, each pattern is a transient and there is random, intermittent switching among the patterns in the course of time evolution. The probability distribution of the transient time is found to follow an algebraic scaling law with a divergent average transient lifetime. Based on symmetry considerations, we develop a stability analysis to understand these phenomena. The general principle of symmetry can also be exploited to explain previously discovered,counterintuitive synchronization behaviors in ecological networks.

关键词： ecological networks cluster synchronization phase synchronization transient chaos network symmetry