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Synthesis of TiO<sub>2</sub> Nanotubes and Their Sensitivity for Toluene Gas
Yue, H.Y.,Huang, S.,Guo, E.J.,Wang, L.P.,Kang, F.W.,Yu, Z.M.,Guo, Y.K.,Sun, F.L. The Korean Powder Metallurgy Institute 2011 한국분말재료학회지 (KPMI) Vol.18 No.1
$TiO_2$ nanopowders with anatase structure were firstly prepared by controlling the pH value of a precursor solution without any heat-treatment at room temperature. The prepared $TiO_2$ nanopowders were hydrothermally treated in 10M NaOH solution at $170^{\circ}C$. Then, the samples were washed in DI water or 0.1M HCl. The $TiO_2$ nanotubes were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The gas sensitivity of $TiO_2$ nanotubes for toluene gas was also investigated. The results show that $TiO_2$ nanotubes can be prepared by hydrothermal treatment. The morphology of $TiO_2$ nanotubes prepared by 0.1M HCl washing is destroyed to some extent. $TiO_2$ nanotubes with DI water washing show better sensitivity than that with 0.1M HCl washing.
Formation of Vortices in a Three-dimensional Dipolar Bose-Einstein Condensate
Yuan Sheng Wang,Shen Tong Ji,Yue E Luo,Zhen Yu Li 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.9
We investigate the vortex formation properties of a three-dimensional (3D) dipolar Bose-Einstein condensate (BEC) of 52Cr atoms in an optical lattice potential through numerical simulations of the time-dependent Gross-Pitaevskii equation with a dissipation term. The mechanisms that influence the dipole-dipole interaction and the repulsive contact interaction between atoms during vortex formation are analyzed. We find that the stability of the vortices weakens with increasing attractive dipolar strength and that the repulsive contact interaction between atoms can increase the number of vortices.
Chuanjing Wu,Yue-E Wang,Di Wu 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.3
In this paper, we study the problem of interval-observer based controller design for switched linear systems with disturbance and measurement noise. First, we propose the definition of finite-time interval-observersfor switched systems and construct finite-time interval-observers for switched linear systems with observer-statedependent switching strategy by giving the ranges of the external disturbance and the measurement noise. Then,by using multiple Lyapunov functions method, some sufficient conditions are provided to guarantee the existenceof the finite-time interval-observers under maximum constraints, and at the same time, based on the proposed sufficient conditions, the observer gains are given and the corresponding sliding motion issue is also solved. Afterthat, we design an interval-observer-based feedback controller for the switched systems. Different from the traditional observer-based controller with state-dependent switching signal designed in most literatures, the controllerdesigned in the paper is based on interval-observer with observer-state-dependent switching signal. Compared withthe traditional observers, the interval-observers are robust to large uncertainties and can provide the ranges of thesystem states in any time. Finally, the feasibility of the proposed method is verified by two numerical examples.
Mingxing Liu,Baowei Wu,Yue-E Wang,Lili Liu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
This paper is concerned with dynamic quantized output feedback and event-triggered guaranteed cost finite-time H∞ control for uncertain switched linear systems with exogenous disturbance. First, one mode-dependent periodic event-triggered strategy is designed, which means that each subsystem has its own event-triggered mechanism. Meanwhile, the periodic detection of the error greatly reduces the sampling number and avoids the appearance of Zeno behavior. Second, considering the state information of the system is difficult to obtain completely, dynamic quantized output feedback controllers based on logarithmic quantizer are used to stabilize the switched system. Besides, combine the multiple Lyapunov functionals and the average dwell time condition, the sufficient condition of finite-time boundedness with H∞ performance level is obtained for the uncertain switched system. Finally, the effectiveness of the proposed method is verified a practical example.
Input-output Finite-time Stability of Switched Singular Continuous-time Systems
Tian Feng,Baowei Wu,Yue-E Wang,YangQuan Chen 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.5
This paper is concerned with the problem of input-output finite-time stability (IO-FTS) for a class of switched singular continuous-time systems. First, the concept of IO-FTS is extended to switched singular systems. Then, by using the average dwell time switching approach and constructing multiple Lyapunov functions, a sufficient condition of IO-FTS for the considered system is presented in the form of linear matrix inequalities (LMIs). Furthermore, based on the derived conditions, a suitable state feedback controller is designed to stabilize the switched singular systems. Finally, an illustrative example is provided to demonstrate the effectiveness of the proposed technique.
Bai Weijuan,Deng Fenghong,Zhang Xiaojiang,Zhang Xiaojiang,Xiao Yue’e,Wang Nan,Liu Xuncai,Fan Qunyan,Guo Baozhong 한국응용생명화학회 2023 Applied Biological Chemistry (Appl Biol Chem) Vol.66 No.-
Edible bird's nest (EBN) is a traditional food which was nourishing and functional. Particularly, there is the epidermal growth factor (EGF) in EBN, which is thought to play an important role in promoting skin repair. However, the type and content of EGF in EBN were not determined yet. In this study, the type of EGF in EBN was identified as bird EGF by enzyme-linked immunosorbent assay and this method was validated to be accurate and precise. Moreover, it was found that the content of EGF in raw-unclean EBN, raw-clean EBN and stewed EBN was 3000 pg/g–4000 pg/g and there were no significant differences, which suggested that the batches, origins, forms, stewing temperatures and stewing times of EBN had no effect on the content of EGF in EBN. However, it was due to that enzyme destroyed the primary structure of EGF, the EGF content of neutral protease and trypsin hydrolysates of EBN was lower than that of flavor enzymes, alkaline protease and pepsin hydrolysates of EGF. This study was the first to determine the type and content of EGF in EBN, and provided a theoretical basis for the selection and processing of EBN and using EBN as a source of EGF.