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Couple-group L2-L∞ Consensus of Nonlinear Multi-agent Systems with Markovian Switching Topologies
Xiao Li,Cancan Zhou,Jianping Zhou,Zhen Wang,Jianwei Xia 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3
The paper is devoted to the couple-group L2-L∞ consensus problem of nonlinear multi-agent systemsaffected by external disturbances. The interaction topologies among agents obey a continuous-time Markovianprocess with unknown transition probabilities. By a system transformation, the problem of couple-group L2-L∞ consensus is converted into a L2-L∞ control issue. Then, by Lyapunov stability theory and graph theory, sufficientconditions for the couple-group L2-L∞ consensus are obtained. The control gains can be acquired via the solutionsof a group of linear matrix inequalities. Moreover, the present method is extended to the multi-group L2-L∞consensus. Finally, an example is provided to illustrate the effectiveness of the results.
Right Ventricular Mass: Thrombus or Tumor?
Zengfa Huang,Jianwei Xiao,Fen Yu,Shuang Guo,Xiang Wang 아시아심장혈관영상의학회 2023 Cardiovascular Imaging Asia Vol.7 No.1
Right ventricular (RV) thrombus is an infrequent and potentially underdiagnosed life-threatening condition. Current studies suggest that multiple non-invasive imaging modalities may be used to diagnose RV thrombus. We report a 51-year-old male patient admitted with fatigue. Transthoracic echocardiography clearly showed the location, shape, and movement of the mass. Cardiac magnetic resonance imaging further delineated the relative signal intensity and enhancement of the RV thrombus.
Tianshu Xu,Jianwei Xia,Xiao-Na Song,Zhen Wang,Hua-Sheng Zhang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.2
In this paper, the topic of sampled-data based dissipativity control for Takagi-Sugeno (T-S) fuzzy Markovian jump systems with incomplete transition rates and actuator saturation is addressed. First of all, by constructing an appropriate two-sided closed-loop function that captures the realistic information of sampling pattern, together with the free-matrix-based inequality approach, a sufficient condition is developed to ensure the considered systems to be strictly(Q,S,R)-γ-dissipative. Then, the corresponding mode-dependent sampled-data controllers are designed based on the given dissipativity condition. As a corollary, the controller design is presented for the system without disturbance. Furthermore, an optimization problem is investigated in order to maximize the domain of the attraction. Finally, simulation examples are offered to verify the feasibility of the results.
Minghe Li,Saifei Hu,Jianwei Xia,Jing Wang,Xiao-Na Song,Hao Shen 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.9
In this work, the problem of predictive control of dissolved oxygen for the activated sludge process model with high nonlinearity and strong coupling is addressed. Firstly, the determination of the structure of fuzzy rules is displayed established upon Activated sludge model 1 (ASM1). Besides, the fuzzy space is divided through the clustering algorithm of fuzzy C-means. The corresponding parameters are estimated by means of the wellknown least squares method. Subsequently, a fuzzy predictive model of dissolved oxygen is established by using the historical data. The aim is to design a predictive controller that is capable of performing the online track of dissolved oxygen attributed to better dynamic response and steadier output in different weather. Ultimately, the availability and validity of the developed technique are verified by a comparison example.
Rapid recycling of waste salt core materials in foundry industry using fractional crystallization
Xiaolong Gong,Xiongjie Xiao,Qianqian Li,Jianwei Zhao,Zitian Fan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
The water-soluble composite salt core materials have attracted increasing interest in the manufacture ofhollow castings with complex structures due to their high strength and excellent water solubility, whilethe treatment of waste brine generated from the salt core represents a major pain point for its large-scaleapplication. To change the above situation, the recycling technology of the waste brine from compositesalt core materials was developed using cooling crystallization combined with solvent-driven crystallization. The influences of dissolution temperature and solvent content on the recovery rate of the compositesalt core materials, including inorganic salt and fortifier, were investigated. In addition, the mechanicalproperties and microstructures of the composite salt core with multiple cycles were compared and analyzed. The results show that the fortifier material of corundum powder exhibits excellent chemical andthermal stability with a 100% recovery rate, and the recovery rate of inorganic salt material can reach79.31% with a 40 C dissolution temperature and a 1.0 mass ratio of methanol to brine. The microstructures,phase compositions and mechanical properties of the multi-recycled composite salt core have notchanged, demonstrating that the recycling of the water-soluble composite salt core is feasible, and favoringthe green development of the foundry industry.
Jingshun Shen,Qi Liu,Qiqi Sun,Jianwei Ren,Xue Liu,Zuoxu Xiao,Chuanwang Xing,Yuexing Zhang,Guangwu Yang,Yanli Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
A novel two-dimensional (2D) single-atom Fe/N/C catalyst (Fe1Zn30NCPDI) has been prepared uponpyrolyzing a well-designed quasi-Fe-/Zn-phthalocyanine-based polymer (qFePc1@qZnPc30@PDI). In theqFePc1@qZnPc30@PDI precursor, qFePc moieties containing Fe-N4 sites are efficiently segregated by lotsof qZnPc moieties connected together by perylene linkers, which not only leads to the larger specific areain the resulting Fe1Zn30NCPDI but more importantly ensures the in-situ formation of Fe-N4 sites on theself-supporting 2D N-doped carbon backbone. Impressively, Fe1Zn30NCPDI exhibites its superior oxygenreduction reaction (ORR) electro-catalytic activity and peroxidase (POD)-like activity. For ORR in an alkalinemedium, it exhibites a much higher onset potential of 0.97 V and half-wave potential of 0.89 V than20 wt% Pt/C catalyst with good durability of 92 % retention rate after 20000 s. And, Fe1Zn30NCPDI alsoshows better peak power density (86 mW cm2) compared with 20 wt% Pt/C in Zn-air battery. Benefiting from the specific POD-like activity of Fe-N4, the Fe1Zn30NCPDI also shows excellent and selectiveperformance in colorimetric H2O2 sensing, with the ultrafast response (30 s), a low limit of detection(10 nM), and good robustness. This work sheds light on a promising design concept for synthesizing 2Dpolymer-derived single-atom multifunctional catalysts.