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Baoshan, China

Li C.,Southwest University | Li C.,Baoshan College | Zhang G.,Southwest University
Mathematical Methods in the Applied Sciences

This paper is concerned with a cross-diffusion system arising in a Leslie predator-prey population model in a bounded domain with no flux boundary condition. We investigate sufficient condition for the existence and the non-existence of non-constant positive solution. We obtain that if natural diffusion coefficient of predator is large enough and cross-diffusion coefficients are fixed, then under some conditions there exists non-constant positive solution. Furthermore, we show that if natural diffusion coefficients of predator and prey are both large enough, and cross-diffusion coefficients are small enough, then there exists no non-constant positive solution. Copyright © 2012 John Wiley & Sons, Ltd. Source

Min L.,Baoshan College
Advanced Materials Research

After the invention of mesoporous, the chiral mesoporous materials had been regarded a hot research issue. Inspired by the chiral phenomenon, in this investigation, we presented several aspect of chiral mesoporous from its first appearance, especially stated the template that could be used to prepare chiral mesoporous, including chiral template and achiral template, besides, the different mechanism of some distinguished scientists' works were introduced, and some application of these material were introduced such as catalyst, HPLC stationary phases and many other fields. © (2012) Trans Tech Publications, Switzerland. Source

Che J.,Nanchang Institute of Technology | Wang J.,Lanzhou University | Wang G.,East China Jiaotong University | Wang G.,Baoshan College

Electric load forecasting is an important task in the daily operations of a power utility associated with energy transfer scheduling, unit commitment and load dispatch. Inspired by the various non-linearity of electric load data and the strong learning capacity of support vector regression (SVR) for small sample and balanced data, this paper presents an adaptive fuzzy combination model based on the self-organizing map (SOM), the SVR and the fuzzy inference method. The adaptive fuzzy combination model can effectively count for electric load forecasting with good accuracy and interpretability at the same time. The key idea behind the combination is to build a human-understandable knowledge base by constructing a fuzzy membership function for each homogeneous sub-population. The comparison of different mathematical models and the effectiveness of the presented model are shown by the real data of New South Wales electricity market. The obtained results confirm the validity of the developed model. © 2011 Elsevier Ltd. Source

Li X.,Key Laboratory of Medicinal Chemistry for Natural Resource | Li X.,Yunnan Nationalities University | Li X.,Baoshan College | Peng F.,Key Laboratory of Medicinal Chemistry for Natural Resource | And 2 more authors.
Advanced Synthesis and Catalysis

The first metal-catalyzed 1,4-selective asymmetric addition of malonates to nitroenynes promoted by a simple chiral nickel(II)-diamine catalyst, was developed, facilitating a mild synthesis of a novel type of multifunctional chiral b-alkynyl acids bearing a nitro group. Based on this protocol, we have developed a practical and collective synthesis of a series of diverse functional molecules and building blocks including new types of chiral balkynyl- γ-amino acids, b-functionalized chiral dketo- γ-lactones, chiral g-alkylidenelactones, alkynylsubstituted pyrrole-3-carboxylic acid derivatives, tetrasubstituted furans and chiral b-alkynyl-γ-lactams. Notably, we discovered two unusual tandem reactions leading to functionalized chiral 1,5-dicarbonyl compounds. In addition, by employing simple bifunctional organocatalysts, we have developed the first regio-, diastereo- and enantioselective conjugate addition of a-substituted b-keto esters to nitroenynes, which is poorly diastereoselective with chiral nickel(II)-diamine catalysts, providing a new entry to adjacent quaternary and tertiary stereocenters in one step. Based on this protocol, we have developed a concise asymmetric synthesis of conformationally constrained bicyclic γ 2-amino acids featuring an alkynyl side chain with an adjacent quaternary carbon stereocenter. The study described here demonstrates that the mutually complementary strategy of transition metal catalysis and organocatalysis is a powerful and promising tool in catalytic asymmetric synthesis. © 2012 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim. Source

Yao W.-H.,Baoshan College | Min L.,Baoshan College
Advanced Engineering and Technology II - Proceedings of the 2nd Annual Congress on Advanced Engineering and Technology, CAET 2015

Carbon, Cobalt co-doped mesoporous titania with anatase crystalline structure (C, Co-MTiO2) was prepared using templating method. The material was characterized by techniques like N2 Physisorption, X-ray diffraction (XRD), HRTEM, UV-Vis. The XRD and N2 physisorption results indicated that the catalyst was a mesoporous material with anatase crystalline structure that carbon and cobalt were highly dispersed on the surface of the TiO2, or were incorporated into the TiO2 framework. The HRTEM images of C, Co-MTiO2 showed uniform hexagonal channel arrays in large areas. The catalyst was used for the solar photocatalytic degradation of methylene blue and methyl violet.It was found that the catalyst exhibited an excellent activity of photocatalytic degradation under solar light irradiation in summer, compared to Co- MTiO2. The enhanced photocatalytic activity of C, Co-MTiO2 catalyst may be attributed to the anatase crystalline structure, nano-size, mesoporous channels, synergistic effects of carbon and cobalt. © 2015 Taylor & Francis Group, London. Source

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