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Yong L.,Shaanxi University of Technology
ICIC Express Letters | Year: 2011

Linear complementarity problem and its importance are well known, over the past decade, an increasing number of studies have been focused on this problem. In this paper, we present two kinds of interior point algorithms for monotone linear complementarity problem based on the Newton direction and centering direction. We show that if a feasible starting point is available, then all the algorithms have polynomial complexity. Numerical results demonstrate that potential-reduction interior point algorithm is superior to feasible interior point algorithm for monotone linear complementarity problem. © 2011 ISSN 1881-803X. Source


Yuan Z.,Shaanxi University of Technology
Journal of Materials Science: Materials in Electronics | Year: 2014

Zinc oxide (ZnO) nanoparticles were synthesized by a simple wet chemical method at low temperature. Morphologies, crystalline structure, and optical transmission of ZnO nanoparticles were investigated. The results showed that the average diameter of as-synthesized ZnO nanoparticles was about 4.9 nm, the nanoparticles were wurtzite-structured (hexagonal) ZnO and had optical band gap of 3.28 eV. Very high optical transmission (>80 %) in visible light region of ZnO nanoparticulate thin films was achieved. Furthermore, an inverted polymer solar cell consisted of ZnO nanoparticles and polymer were fabricated. The device exhibited an open circuit voltage (Voc) of 0.50 V, a short circuit current density (Jsc) of 1.76 mA/cm2, a fill-factor of 38 %, and a power conversion efficiency of 0.42 %. © 2014 Springer Science+Business Media New York. Source


Yuan Z.,Shaanxi University of Technology
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2014

A simple photodiode based on boron subphthalocyanine chloride (SubPc) organic semiconductor and zinc oxide (ZnO) inorganic nanoparticle (NP) thin films planar heterojunction was fabricated. The current density-voltage (J-V) characteristics of ITO/ZnO NPs/SubPc/Ag device in dark and under 20 mW/cm 2 illumination power with a solar simulator were investigated in detail. Measurement results showed that the device exhibited good rectifying behaviors in dark and under illumination. A high rectification ratio (RR) of 607 at ±1.65 V and a low turn-on voltage of 0.9 V were achieved for the device in dark, such high RR was ascribed to high electron mobility of ZnO NPs and large ZnO NPs/SubPc interface in the device. Also, the photoresponsive mechanism of the photodiode was illuminated in term of the schematic band diagram and the transportation process of charge carriers in the device. © 2013 Elsevier B.V. Source


Yuan Z.,Shaanxi University of Technology
Journal of Materials Science: Materials in Electronics | Year: 2014

Well-aligned ZnO nanowire arrays were grown on indium tin oxide coated glass substrates by a facile chemical bath deposition technique. Morphologies, crystalline structure and optical transmission were investigated by field-emission scanning electron microscope, X-ray diffraction and UV-visible transmission spectrum, respectively. The results showed that ZnO nanowires were aligned in a dense array approximately perpendicular to substrate surface, they were wurtzite-structured (hexagonal) ZnO. In addition, the nanowire arrays exhibited high optical transmission (>85 %) in the visible region. Furthermore, an inverted inorganic/polymer hybrid solar cell was built using as-grown well-aligned ZnO nanowire arrays as inorganic layer, under the AM 1.5 illumination with a light intensity of 80 mW/cm2, the device showed an open circuit voltage (Voc) of 0.44 V, a short circuit current (Jsc) of 3.23 mA/cm2, a fill-factor of 38 %, and a power conversion efficiency of 0.68 %. © 2014 Springer Science+Business Media New York. Source


The second-generation poly(ester amine) dendrimer was prepared by Michael addition reaction and esterification reaction at first. Then, a series of novel waterborne polyurethane (WPU)-based composites were prepared by the addition of poly(ester amine) dendrimer into the WPU. The structures and the morphology of the WPU composites were measured with Fourier transform infrared spectrometer, scanning electron microscopy, and X-ray diffraction. SEM images revealed that the nanosilica was well dispersed in the WPU matrix. The mechanical properties of the WPU composites were improved with the addition of poly (ester amine) dendrimer. The dynamic mechanical thermal analysis results showed that the WPU composites had higher glass transition temperature than that of pure WPU, especially after incorporation of poly(ester amine) dendrimer. This conclusion is in good agreement with the differential scanning calorimetry results. The thermal properties of the pure WPU and its composites were investigated by thermogravimetric analysis. The results showed that the initial decompose temperature began from about 250°C, and had a little increase when introducing poly(ester amine) dendrimer into the WPU matrix. © 2012 Society of Plastics Engineers. Source

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