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Yulin, China

Han Z.-P.,Yulin University | Li Y.,Soochow University of China
Inorganic Chemistry Communications | Year: 2012

A complex of composition [Cu I 4Cu II(mtpo) 4(H 2O) 2Cl 2] n (1) was synthesized from reaction of Hmtpo (Hmtpo = 5-methyl-[l,2,4]-triazolo-[l,5-a]- pyrimidin-7-o1) with one equivalent of CuCl 2·2H 2O in water at 100 °C under autogenous pressure. Complex 1 was fully characterized by X-ray single crystal diffraction, elemental analysis and IR spectroscopy. X-ray analysis reveals that complex 1 is a mixed-valence coordination polymer and displays 1-D chain structure. Compound 1 was able to heterogeneously catalyze the ketalization reaction of 2-butanone and ethylene glycol to afford 2-ethyl-2-methyl-[1,3]-dioxolane in excellent yield under mild conditions. © 2012 Elsevier B.V. All rights reserved. Source


Zhang H.,Yulin University
Security and Communication Networks | Year: 2016

As an important kind of digital signature, the aggregate signature could aggregate n signatures into a signature and verify those signatures simultaneously. It is suitable for the constrained environment with limited ability of computation and communication. Recently, Chen et al. proposed a certificateless aggregate signature scheme to improve the performance of the verification. This paper proposes two concrete attacks against the certificateless aggregate signature scheme of Chen et al. to show that their scheme is not secure for practical applications, that is, the adversary can forge a signature of any message easily. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd. Source


Xiao-yan J.,Yulin University
Journal of Convergence Information Technology | Year: 2012

In order to overcome the shortage of ε-insensitive loss, Gaussian loss function is selected as the loss function of support vector regression algorithm.Here, electrical load prediction based on the hybrid model of Gaussian support vector regression algorithm and embedded PSO is presented in this paper.The embedded particle swarm optimization algorithm is applied to determine the parameters of Gaussian support vector regression algorithm. Finally, experimental study for electrical load prediction based on the hybrid model of Gaussian support vector regression algorithm and embedded PSO is performed to show the effectiveness of the hybrid model of Gaussian support vector regression algorithm and embedded PSO. The experimental results demonstrate that the hybrid model of Gaussian support vector regression algorithm and embedded PSO has a higher electrical load prediction accuracy than support vector regression algorithm. Source


Zhang Z.-F.,Yulin University
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the crystal structure of the title compound, [FeCl2(C 10H8N2)2]ClO4, the coordination around the FeIII atom is approximately octa-hedral. The equatorial positions are occupied by two N atoms from two 2,2′-bipyridyl ligands [Fe - N = 2.121 (5) and 2.147 (5) Å] and two Cl atoms [Fe - Cl = 2.220 (2) and 2.2074 (18) Å]. Weak inter-molecular C - H⋯O and C - H⋯Cl hydrogen bonds and C - H⋯π inter-actions consolidate the crystal packing. Source


Li J.,Yulin University
Xiandai Huagong/Modern Chemical Industry | Year: 2016

Taking Yulin city (Shaanxi) as an example, the market competitiveness situation of methanol fuels of energy cities are studied. On the basis of clear major competitors, three-elements system affecting the methanol fuel market is determined by using AHP model. The judgement matrix is established to calculate the index weights for industry atractiveness and competitiveness. GE matrix model is used to compare the evaluation results of methanol fuel and its main competitive products. The market competitiveness and correspondign competitive strategies of methanol fuel are eventually obtained. © 2016, China National Chemical Information Center. All right reserved. Source

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