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Wang J.,Hunan University of Science and Technology | Gong M.,Universities of Hunan Province | Hou Z.,Changsha University of Science and Technology
Sensors and Transducers | Year: 2014

Propose a fault diagnosis method which combines analytical redundancy with bond graph model for electrolytic high power rectifier system. Firstly, using the software 20-sim, the author builds a bond graph model of the system and established a diagnostic bond graph model through adding virtual sensor in bond graph model; then, according to the causal relationship in the components, analytical redundancy relationship and its fault characteristic matrix are set up; finally, comparing the observed characteristics matrix and fault characteristic matrix, fault can be detected and isolated quickly. The simulation results demonstrate that the method is convenient and effective for Power electronic fault diagnosis. © 2014 IFSA Publishing, S. L. Source

Wang J.,Xiangtan University | Sun H.,Xiangtan University | Li D.,Xiangtan University | Yuan J.,Xiangtan University | And 4 more authors.
Australian Journal of Chemistry | Year: 2015

In this paper, poly(ε-caprolactone)-graft-carboxylic acid (P(α-C2CL)) was prepared via a thio-bromo click reaction between mercaptosuccinic acid and poly(α-bromo-ε-caprolactone). It is readily soluble in aqueous solutions (pH 5.5-9.8) due to the presence of carboxylic groups in each repeating unit. A series of water-soluble P(α-C2CL)-paclitaxel prodrugs with high drug contents (up to 41.4wt-%) was prepared by esterification. Meanwhile, methyl tetrazolium (MTT) assays showed that P(α-C2CL)-paclitaxel prodrugs exhibited a high antitumour effect on A549 and MCF-7 cells. These prodrugs have appeared as a highly versatile and potent platform for cancer therapy. © CSIRO 2015. Source

Zhu J.,Central South University | Zhu J.,Universities of Hunan Province | Tian Y.,Central South University | Tian Y.,Universities of Hunan Province | And 2 more authors.
Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | Year: 2012

The core problem of the concerned survey adjustment is to find appropriate value for the unknown criterion parameter. Until now, there is no united theory to solve this problem. The authors firstly use one expression to unite all adjustment criteria with unknown parameters in form. Then a method with virtual observations is proposed to resolve the united expression. In order to illustrate the feasibility and advantages of this method, an example compared with LS and other methods is presented at last. Source

Tao X.,Central South University | Tao X.,Universities of Hunan Province | Zhu J.,Central South University | Zhu J.,Universities of Hunan Province | And 2 more authors.
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2012

Many methods can be used to determine smoothing parameters in semiparametric model, but smoothing parameters vary with these methods for the same model. After comparative analysis of the L-Curve, GCV(Generalize Cross Validation) and virtual observational approach, the factors influencing smoothing parameter are studied by simulated example. Smoothing parameters have a close relation with signal-to-noise ratio. When the signal-to-noise ratio increases, variation trend of smoothing parameters is different. The best method determining smoothing parameters in different situations is different. Source

Zhao J.,Universities of Hunan Province | Chen X.,Universities of Hunan Province | Rong C.,Hunan Normal University | Yu L.,Universities of Hunan Province | And 3 more authors.
Journal of Rare Earths | Year: 2011

The establishment of an approach to design tunable yellow emission through singly doped single-phased phosphors to obtain white LED-based InGaN chip was reported. BaY2-xS4:xHo3+ phosphors were prepared by the high temperature solid state reaction and characterized by X-ray diffraction and photoluminescence spectra. Under the excitation of 465 nm, the emission spectra of these phosphors exhibited three sharp emission lines peaked at about 492, 543 and 661 nm of Ho3+ corresponding to 5F3, 5F4 (5S2) and 5F5→5I8 transitions, respectively, with comparable intensities, resulting in a yellow light emission. The luminescence mechanism for Ho3+ in BaY2S4 was explained. © 2011 The Chinese Society of Rare Earths. Source

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