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Liang Tao,Qiang Chen,Yurong Nan 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.2
In this paper, an adaptive sliding mode control incorporating with a nonlinear disturbance observer isproposed for a class of second-order nonlinear systems with unknown parameters and matched lumped disturbance. A double hyperbolic reaching law with chattering-free characteristic is first constructed, and an adaptive slidingmode controller is designed to guarantee the satisfactory tracking performance and fast error convergence. Thechattering problem is eliminated by means of the infinitely approaching equilibrium point instead of crossing it byemploying two hyperbolic functions. In order to identify the unknown parameters accurately, an adaptive parametricupdate law is presented through constructing a set of auxiliary filtered variables. Then, a nonlinear disturbanceobserver is proposed to improve the tracking performance and compensate for the lumped disturbance includingperturbations and uncertainties. The stability analysis is provided by the Lyapunov stability theory, and a numericalsimulation on a mass-spring damper system is given to demonstrate the effectiveness of the proposed method.
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Peng Li,Xiaoxiao Ma,Yurong Liang,Junhua Tan,Liyong Wang 한국탄소학회 2019 Carbon Letters Vol.29 No.6
Nanoporous carbon/MnO2 (C–MnO2) composites with foam-like structure based on modified nitrile butadiene rubber were achieved by thermal treatment, followed by alkaline solution etching and dipping method. The XRD, nitrogen adsorption and desorption, and SEM and TEM were used to characterize the microstructure of the obtained C–SiO2, C and C–MnO2. Finally, all the obtained samples have been used in three-electrode system to study the electrochemical properties including cyclic voltammetry, galvanostatic charge/discharge and AC impedance for supercapacitor. The study found that the specific capacity of C–MnO2 electrode material for supercapacitor could reach as high as 109 F/g under the current density of 0.5 A/g, which is much higher than those of the other two. These superior electrochemical properties are attributed to the synergistic effect MnO2 particles with the C matrix which functions as a conductive support.
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TaoMa,Huifang Wang,Shiping Liang,Qiang Xiao,Panrong Cao,Xuan Chen,Ying Niu,Yurong He,Zhaohui Sun,XiujunWen,Cai Wang 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.1
Ectropisgrisescens Warren (Lepidoptera: Geometridae) is one of the most severe defoliating pests of tea plants. Synthetic pesticides have been widely applied to control this pest in tea plantations, but pesticide residues may decrease the quality and safety of tea products. In the present study, we hypothesized that soil treatment with the two commercial biopesticides (Shuiguxin ® ) based on Metarhizium anisopliae (Metchnikoff) Sorokin and Beauveria bassiana (Balsamo) could reduce the survivorship and fitness of E. grisescens. Wandering larvae of E. grisescens were allowed to pupate in soil treated with each biopesticide, and the concentrations of M. anisopliae (Shuiguxin ® ) and B. bassiana (Shuiguxin ® ) that produced the 50% mortality values (LC 50 ) were 2.9 × 10 6 and 1.6 × 10 7 conidia/g soil, respectively. Artificial burying the pupae using soil treated with M. anisopliae (Shuiguxin ® ) and B. bassiana (Shuiguxin ® ) (1 × 10 8 or 1 × 10 9 conidia/g soil for both biopesticides) also significantly reduced emergence success of E. grisescens. In addition, choice tests showed that soil treated with the high concentration of M. anisopliae (Shuiguxin ® ) or B. bassiana (Shuiguxin ® ) had repellent effects on pupating E. grisescens. However, sublethal concentrations (LC 25 and LC 50 ) of both biopesticides did not significantly affect fecundity, fertility and longevity of post-emerged adults. Our study showed that soil treatment with the two commercial biopesticides caused direct mortality of pupating E. grisescens, but may not effectively suppress E. grisescens populations at sublethal concentrations. The realistic application of the fungal dosage in fields should be determined in future studies
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Qiang Chen,Miaomiao Gao,Liang Tao,Yurong Nan 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.9
In this paper, an adaptive fixed time parameter estimation and synchronization control scheme is proposedfor multiple robotic manipulators with unknown parameters and lumped disturbances. A mean coupling synchronization error is defined by averaging all the tracking errors of multiple robotic manipulators, and an adaptive fixed time synchronization control scheme is proposed to guarantee that both the tracking error and the synchronization error can simultaneously converge to zero within a fixed time, which means that the upper bound of the settling time is independent of the initial conditions. Moreover, an adaptive parameter estimation law is developed through constructing auxiliary filtered variables to achieve the accurate estimation of the unknown system parameters. Comparative simulations are provided to validate the effectiveness of the proposed scheme.
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Li Peng,Ma Xiaoxiao,Liang Yurong,Tan Junhua,Wang Liyong 한국탄소학회 2019 Carbon Letters Vol.29 No.6
Nanoporous carbon/MnO2 (C–MnO2) composites with foam-like structure based on modified nitrile butadiene rubber were achieved by thermal treatment, followed by alkaline solution etching and dipping method. The XRD, nitrogen adsorption and desorption, and SEM and TEM were used to characterize the microstructure of the obtained C–SiO2, C and C–MnO2. Finally, all the obtained samples have been used in three-electrode system to study the electrochemical properties including cyclic voltammetry, galvanostatic charge/discharge and AC impedance for supercapacitor. The study found that the specific capacity of C–MnO2 electrode material for supercapacitor could reach as high as 109 F/g under the current density of 0.5 A/g, which is much higher than those of the other two. These superior electrochemical properties are attributed to the synergistic effect MnO2 particles with the C matrix which functions as a conductive support.
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