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Forwarding-based Trajectory Tracking Control for Nonlinear Systems with Bounded Unknown Disturbances
Xianlin Huang,Xu Zhang,Hongqian Lu 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.5
There are only a few methods for controlling high-order nonlinear systems, except for standard backsteppingtechnique. Due to the fact that I&I theory proposed by Astolfi and Ortega is able to accomplish thesystem immersion by selecting a lower-order target system and a vital mapping, a bottom-up recursive procedurefor designing tracking control laws for a class of n-dimensional strict-feedback nonlinear systems is focused inour work. The required mappings are transformed into virtual control inputs, and system order reduction is realizedas design step is implemented repetitively. A first-order filter is employed at each step to compute analyticderivatives of mappings. The benefit of our proposed algorithm can not only improve the computation efficiencyto simplify all controls’ forms, but also suppress the high-frequency noise. While the off-the-manifold coordinateis rendered insensitive to the time-varying and bounded but unknown disturbance, the robust stability can be ultimatelyguaranteed. A quadrotor helicopter is used to show designing procedures and controller performance viavarious simulations.
Xiaojie Li,Shiying Teng,Xianlin Xu,Hang Wang,Feng Dong,Xupin Zhuang,Bo-wen Cheng 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4
A new type of hydrophobic polyacrylonitrile (PAN) nanofiber is fabricated by solution blowing of a blend solution of fluorine-containing polyacrylate (FPA) and PAN. The nanofibers’ surface composition, hydrophobicity, and protection ability were evaluated to clarify the effects of FPA addition. Results revealed that FPA addition increased the nanofiber diameter, as well as enhanced the hydrophobicity and transport properties of the nanofiber mats. The mats had average water contact angles of 123.44 o, 132.11 o, and 137.11 o for FPA contents of 0.66 wt%, 1.98 wt%, and 3.30 wt%, respectively. All these results suggested the potential of the solution blowing nanofiber mats as protection materials.
Preparation and BSA Adsorption Behavior of Chitosan-arginine Based Nanofiber Membranes
Xiaojie Li,Guiqun Chao,Liangan Wang,Xianlin Xu,Zhanjun Cai,Lei Shi,Xupin Zhuang,Bo-wen Cheng 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
In this work, an affinity nanofiber membrane was successfully prepared by solution blowing of arginine-modified chitosan (CS-Arg) for bovine serum albumin (BSA) adsorption. CS-Arg was firstly synthesized by coupling L-arginine onto chitosan backbone. Then, CS-Arg nanofiber membranes (CANFs) were fabricated using solution blowing process with Polylactide (PLA) as assistant polymer. The results showed that CANFs effectively adsorbed BSA, and the adsorption capacities were influenced by the degrees of substitution (DS) of arginine in CS, pH value, contact time, and initial protein concentration. The highest adsorption capacity of 445.19 mg/g was achieved uvnder the following conditions: DS of 43.7 %, pH of 7.14, and initial concentration of 3.0 mg/ml. BSA adsorbed on the CANFs membrane conformed to Langmuir model, and the adsorption rate was consistent with the second-order kinetics model. This work implies that an arginine-modified chitosan nanofiber-based novel biomaterial has a potential application in adsorption of BSA.
Xian Lin,Jinling Chen,Gengsheng Xiao,Yujuan Xu,Daobang Tang,Jijun Wu,Jing Wen,Weidong Chen 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.3
Ultrasonic-microwave synergistic extraction (UMSE) was optimized for the extraction of oligosaccharides from longan pulp (OLP). Box-Behnken design was used to evaluate the effects of temperature (35-55oC), ultrasonic time (5-25 min), and water to material ratio (10-30 mL/g) on the extraction efficiency of crude OLP. A regression model was developed and its validity was statistically demonstrated. Significant interaction between temperature and water to material ratio was observed. The following optimal conditions for the extraction yield of crude OLP were determined: extraction temperature 55oC, ultrasonic time 18.52 min, and water to material ratio 10 mL/g. The extracted OLP were purified for the determination of molecular weight distribution and antioxidant activity. Results of matrix-assisted laser desorption ionization time-of-flight mass spectrometry revealed that the molecular weight distribution of the purified OLP ranged from m/z 495.138 to 795.511. The purified OLP exhibited a dose-dependent behavior in 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity.