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Guo Jia,Akram Naeem,Zhang Liugen,Cao Xianglei,Wang Guangyao,Ahmad Ali,Niu Junmin,Mansha Muhammad Saad,Zhang Yi,Wang Jide 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11
This work reveals a schematic strategy to massively fabricate a series of OH-riched copper oxides (CuO-OH), which could be used as highly efficient chemo catalysts for water oxidation reaction (WOR). The results indicate that the as-prepared CuO-OH exhibited excellent catalytic activity (2,900 µmol·h−1·g−1) toward water oxidation, far higher than the pure CuO formed through calcination. According to the radical capture results and the DRIFTS, XRD, and Raman spectra data, sulfate radicals were the main active species. Subsequent data of BET, HR-TEM, and FT-IR spectra reveal that the CuO-OH could activate persulfate ions in the dark to produce sulfate radicals efficiently at room temperature and promote the sulfate radicals to carry out immediately to hydroxide-mediated deprotonation steps in WOR. Based on the results above, a mechanism is proposed.
Event-triggered Asynchronous Filter of Switched Nonlinear Positive Systems
Shitao Zhang,Xianglei Jia,Junfeng Zhang,Peng Lin 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
This paper is concerned with the event-triggered nonlinear filter (ETNF) problem of switched nonlinear positive systems (SNPSs) under asynchronous switching. The nonlinearities of the systems are located into several sector fields. Under a 1-norm inequality-based event-triggering condition, the augmented filter error systems are established by considering the subsystems and the corresponding filters in the matched and mismatched time intervals. Multiple copositive Lyapunov functions (MCLFs) associated with an average dwell time (ADT) switching are employed for the systems. A nonlinear asynchronous filter based on event-triggering mechanism is constructed for the underlying systems with nonlinear disturbance in terms of the matrix decomposition technique. The novelties contain three aspects: (i) A nonlinear filter is constructed for SNPSs, (ii) A linear programming (LP)-based filter gain design approach is introduced, and (iii) An event-triggering mechanism is developed for SNPSs. Finally, one example is given to verify the effectiveness of the obtained results.
Adaptive Stabilization of Feedforward Time-delay Systems with Uncertain Output Equation
Yiming Shao,Xianglei Jia,Wenhui Liu,Guobao Liu 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4
In this work, the problem of global adaptive stabilization is solved by output feedback for a family of feedforward nonlinear time-delay systems with uncertain output equation and unknown growth rate. To deal with system uncertainty, a low-gain observer incorporating with novel adaptive gain is first proposed. Next, via output feedback, an adaptive delay-free controller is constructed by combining scaling change with backstepping algorithm. Compared with existing results, the controller proposed is capable of handling both uncertain output equation and unknown delay. With the aid of Lyapunov-Krasovskii functional and Barbalat ˘ ’s lemma, it is shown that the state and its estimate converge asymptotically to zero, and the adaptive gain is bounded. Furthermore, by numerical simulations, the usefulness of the control scheme is illustrated.