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Effect of crystal structure on adsorption behaviors of nanosized TiO2 for heavy-metal cations
Xiaofeng Xie,Lian Gao 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Adsorption behaviors of Pb(II) and Cd(II) ions on the nanosized titanium dioxide with different crystal structure, such as anatase, rutile, mix crystal (Degussa P25) and amorphism have been explored. The adsorption and desorption experiments of the Pb(II) and Cd(II) ions are carried out in titanium dioxide suspension under different pH value conditions. Adsorption kinetics has been studied with pH dependence isotherms, which indicates that both chemisorption and physisorption are existed in adsorption courses. The results show that the anatase TiO2 powders possess the highest chemisorption capacities among the samples, which can be attributed to its higher surface energy, rough surface and unsaturated oxygen bond. The mechanism of adsorption is suggested to be the soft acid/soft base interactions to form complexes for chemisorption and electrostatic force of electric double layer (EDL) model for physisorption. Adsorption behaviors of Pb(II) and Cd(II) ions on the nanosized titanium dioxide with different crystal structure, such as anatase, rutile, mix crystal (Degussa P25) and amorphism have been explored. The adsorption and desorption experiments of the Pb(II) and Cd(II) ions are carried out in titanium dioxide suspension under different pH value conditions. Adsorption kinetics has been studied with pH dependence isotherms, which indicates that both chemisorption and physisorption are existed in adsorption courses. The results show that the anatase TiO2 powders possess the highest chemisorption capacities among the samples, which can be attributed to its higher surface energy, rough surface and unsaturated oxygen bond. The mechanism of adsorption is suggested to be the soft acid/soft base interactions to form complexes for chemisorption and electrostatic force of electric double layer (EDL) model for physisorption.
Xie Hongsheng,Zhao Xiaofeng 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8
Artificial rejection system strains of particle swarm optimization algorithm, introduced selection mechanism and nonlinear optimization, using nonlinear mutation operator, such as copying and improve the algorithm convergence speed and population diversity, so as to put forward a kind of based on nonlinear plant choose the rejection of particle swarm optimization algorithm, has advantages of few parameters to adjust, and easy to implement. Combined with Iris classification problem, a weight optimization is applied to the artificial neural network, and the method based on the standard particle group algorithm and the simple comparison of artificial neural network training, the experimental results show that compared with other two kinds of algorithm performance is better, this algorithm has good convergence and stability.
Modeling and controller optimization for current-fed isolated bidirectional DC-DC converters
Zhang, Zhao,Xie, Shaojun,Shang, Xiaofeng,Qian, Qiang,Xu, Jinming The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
Current-fed isolated bidirectional DC-DC converters (CF-IBDCs) play an important role in battery energy storage systems. However, the closed-loop dynamics is rather slow with conventional proportional-integral controllers because a precise mathematic model remains absent for optimization. In this paper, a simple precise mathematical model is presented to describe the large and small-signal behaviors of the CF-IBDC. The full-order continuous model can accurately capture the dynamic behaviors and cover all operation conditions. The small-signal model is derived, and the DC filter inductors and clamp capacitors are found to be the natural causes of instability. Based on this finding, special controllers are proposed to optimize the dynamic response of the full closed-loop control system. The dynamic response time of the CF-IBDC is greatly reduced with the proposed controller. The correctness of the presented model and the dynamic response of the optimized closed-loop control system are verified by simulations.
Highly-sensitive Detection of Salvianolic Acid B using Alumina Microfibers-modified Electrode
Sun, Dong,Zheng, Xiaoyong,Xie, Xiafeng,Yang, Xiaofeng,Zhang, Huajie Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
Alumina microfibers with porous structures were prepared through hydrothermal reaction, and then used to modify the surface of carbon paste electrode (CPE). After modification with alumina microfibers, the electrochemical activity of CPE was found to be greatly improved. On the surface of alumina microfibers-modified CPE, the oxidation peak current of salvianolic acid B, a main bioactive compound in Danshen with anti-oxidative and anti-inflammatory effects, was remarkably increased compared with that on the bare CPE surface. The influences of pH value, amount of alumina microfibers and accumulation time were studied. Based on the strong signal amplification effects of alumina microfibers, a novel electrochemical method was developed for the detection of salvianolic acid B. The linear range was from 5 ${\mu}gL^{-1}$ to 0.3 mg $L^{-1}$, and the detection limit was 2 ${\mu}gL^{-1}$ (2.78 nM) after 1-min accumulation. The new method was successfully used to detect salvianolic acid B in ShuangDan oral liquid samples, and the recovery was over the range from 97.4% to 102.9%.
Youngho Eun,Zhicheng Xie,Zihao Wang,Xiaofeng Wu 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
This study presents the early-stage development status of the novel magnetorquer focusing on its operational capabilities to be applied in space applications. The aim is to show that the new magnetorquer can provide enough torque to a nano-scale satellite to perform a reorientation maneuver which is generally considered beyond the capacity due to its physical limitations. As the actuation process of the new magnetorquer differs from the conventional eletromagnet-based torquers, we designed the control input to have strictly three states only to detour the complexity behind the magnetization process which is subject to magnetic hysteresis. As the objective of this work is to prepare for the follow-on hardware experiment for demonstration, a software-based simulation environment is constructed to reflect the actual circumstances based on our previous measurements and new setups. The simulation result illustrates that such a pointing maneuver is achievable by employing the new magnetorquer with a relatively small amount of control effort while keeping the tracking performance within a predefined boundary.
Highly-sensitive Detection of Salvianolic Acid B using Alumina Microfibers-modified Electrode
Dong Sun,Xiaoyong Zheng,Xiafeng Xie,Xiaofeng Yang,Huajie Zhang 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
Alumina microfibers with porous structures were prepared through hydrothermal reaction, and then used to modify the surface of carbon paste electrode (CPE). After modification with alumina microfibers, the electrochemical activity of CPE was found to be greatly improved. On the surface of alumina microfibersmodified CPE, the oxidation peak current of salvianolic acid B, a main bioactive compound in Danshen with anti-oxidative and anti-inflammatory effects, was remarkably increased compared with that on the bare CPE surface. The influences of pH value, amount of alumina microfibers and accumulation time were studied. Based on the strong signal amplification effects of alumina microfibers, a novel electrochemical method was developed for the detection of salvianolic acid B. The linear range was from 5 μg L−1 to 0.3 mg L−1, and the detection limit was 2 μg L−1 (2.78 nM) after 1-min accumulation. The new method was successfully used to detect salvianolic acid B in ShuangDan oral liquid samples, and the recovery was over the range from 97.4% to 102.9%.
JingJing Cui,ZhengGe Huang,BeiBei Li,XiaoFeng Xie 대한수학회 2023 대한수학회보 Vol.60 No.5
For solving complex symmetric positive definite linear systems, we propose a single step real-valued (SSR) iterative method, which does not involve the complex arithmetic. The upper bound on the spectral radius of the iteration matrix of the SSR method is given and its convergence properties are analyzed. In addition, the quasi-optimal parameter which minimizes the upper bound for the spectral radius of the proposed method is computed. Finally, numerical experiments are given to demonstrate the effectiveness and robustness of the propose methods.