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Weihao Pan,Xianfu Zhang,Hanfeng Li 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.7
This paper focuses on the event-triggered output feedback control problem for a class of large-scale nonlinear time-delay systems with asymmetric dead-zone input. Without knowing the precise priori knowledge of dead-zone parameters, an event-triggered output feedback control strategy is developed based on the dynamic gain design approach. It is proved by the Lyapunov analysis that all signals of the closed-loop system are globally bounded and the system states converge to a bounded region which is adjustable. Moreover, the Zeno behavior is avoided. Compared with the existing results, the considered nonlinear system allows more general growth condition, and the proposed event-triggered control strategy effectively handles dead-zone input, time delay and the more general nonlinear characteristic. Finally, an example is used to illustrate the validity of the proposed control strategy.
Weihao Zhu,Yuanfeng Wu,Guiyun Yi,Xiaoxiao Su,Qiangsheng Pan,Shengbin Shi,Olayinka Oderinde,Guomin Xiao,Chuanxiang Zhang,Yulong Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
The present work is aimed at studying the synergistic catalysis of the bimetal ZIFs containing Co and Znmetal ions prepared by solvothermal method in the degradation of organic pollutants under ambientconditions. The bimetal mixed ZIFs were further characterized by some techniques such as XRD, SEM,TG-DTG, XPS, UV–vis, ESR, and N2-adsorption. Interestingly, the sample prepared with equal metal ions(1Zn:1Co) showed the highest catalytic performance for methylene blue (MB) degradation (94.10 %). Thismay be associated with the interaction between cobalt and zinc within the adjacent lattice, which makethe MB molecule to be easily adsorbed and degraded on empty electron orbit. Furthermore, the highestdegradation of MB was achieved with 98.83 % under the optimized conditions (catalyst weight of 50 mg,pH of 5, 3 h, 30 C). Besides, the various substrates such as methyl orange, indole, rofloxacin, methyl blue,and tetracycline were also investigated under the same conditions. Additionally, the DFT calculationresults suggested the more orbital distribution (LUMO, HOMO) of ZIF(1Zn:1Co) can result to more electronsbeing easily captured, and generate more radicals via electron transfer. Finally, the photocatalyticdegradation of MB is consistent with the first law of kinetics, and the activation energy is 26.797 KJ/molin the presence of ZIF(1Zn:1Co).