作者： Qi, Liqun;Wang, Fei;Wang, Yiju

期刊： Mathematical Programming,2009年118(2):301-316 ISSN：0025-5610

通讯作者： Qi, LQ

作者机构： [Qi, Liqun] Department of Applied Mathematics, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;[Wang, Fei] Department of Mathematics, Hunan City University, Yiyang, Hunan, China;[Wang, Yiju] School of Operations Research and Management Sciences, Qufu Normal University, Rizhao Shandong 276800, China

通讯机构： [Qi, Liqun] Hong Kong Polytech Univ, Dept Appl Math, Kowloon, Hong Kong, Peoples R China.

关键词： Applications. - Canonical forms - Eigenvalue methods - Eigenvalues - Higher dimensions - Higher orders - Local minimizers - Local minimums - Multidimensional cases - Numerical experiments - Optimization methods - Optimization solutions - Orthogonal transformation - Polynomial optimization - Polynomial optimization problems - Supersymmetric tensor - Z-eigenvalue

摘要： As a global polynomial optimization problem, the best rank-one approximation to higher order tensors has extensive engineering and statistical applications. Different from traditional optimization solution methods, in this paper, we propose some Z-eigenvalue methods for solving this problem. We first propose a direct Z-eigenvalue method for this problem when the dimension is two. In multidimensional case, by a conventional descent optimization method, we may find a local minimizer of this problem. Then, by using orthogonal transformations, we convert the underlying supersymmetric tensor to a pseudo-canonical form, which has the same E-eigenvalues and some zero entries. Based upon these, we propose a direct orthogonal transformation Z-eigenvalue method for this problem in the case of order three and dimension three. In the case of order three and higher dimension, we propose a heuristic orthogonal transformation Z-eigenvalue method by improving the local minimum with the lower-dimensional Z-eigenvalue methods, and a heuristic cross-hill Z-eigenvalue method by using the two-dimensional Z-eigenvalue method to find more local minimizers. Numerical experiments show that our methods are efficient and promising. ©2007 Springer-Verlag.

语种： 英文

作者： Xiao, Yan-Ping;Pan, Qing-Lin;Li, Wen-Bin;Liu, Xiao-Yan;He, Yun-Bin

期刊： Materials and Design,2011年32(4):2149-2156 ISSN：0261-3069

通讯作者： Xiao, Y.-P.(xiaoyanping204@hotmail.com)

作者机构： [Liu, Xiao-Yan; Li, Wen-Bin; He, Yun-Bin; Xiao, Yan-Ping; Pan, Qing-Lin] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Li, Wen-Bin] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[Pan, Qing-Lin] Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Changsha 410083, China

通讯机构： [Xiao, Yan-Ping] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.

关键词： Al-Zn-Mg-Cu alloy - Corrosion behaviour - E. Corrosion - Exfoliation corrosion - F. Microstructure - Grain boundary precipitate - Intergranular corrosion - Loss of strength - Nonferrous metals and alloys - Optical microscopes - Retrogression and reaging - Transmission electron microscope

摘要： Influence of retrogression and re-aging treatment on the microstructure, strength, exfoliation corrosion, inter-granular corrosion and stress corrosion cracking of an Al-Zn-Mg-Cu alloy has been investigated by means of optical microscope (OM), transmission electron microscope (TEM) and electrochemical impedance spectroscopy (EIS). The results show that retrogression and re-aging treatment can increase the size and the distribution discontinuity of the grain boundary precipitates, and lead to the increase of the corrosion resistance without the loss of strength and ductility. In addition, the analysis of electrochemical impedance spectroscopy shows that retrogression and re-aging treatment can enhance the resistance to exfoliation corrosion. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.

语种： 英文

作者： Yang, Ronghua;Jin, Jianyu;Long, Liping;Wang, Yongxiang;Wang, Hao;Tan, Weihong

期刊： Chemical communications (Cambridge, England),2009年(3):322-324 ISSN：1359-7345

通讯作者： Yang, RH

作者机构： [Yang, Ronghua; Long, Liping; Tan, Weihong] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Yang, Ronghua; Long, Liping; Tan, Weihong] Hunan Univ, Ctr Biomed Engn, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Yang, Ronghua; Jin, Jianyu; Wang, Yongxiang; Wang, Hao] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China.;[Long, Liping] Hunan City Univ, Dept Chem & Environm Engn, Yiyang 413500, Hunan, Peoples R China.;[Tan, Weihong] Univ Florida, Ctr Res Bio Nano Interface, Dept Chem, Gainesville, FL 32611 USA.

通讯机构： [Yang, Ronghua] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.

摘要： We report that the hydrogen-bonding pattern in a molecular beacon can be replaced by metal-dependent pairs of Hg(2+) and DNA thymine ( T) bases. A molecular beacon based on T-Hg(2+)-T exhibits a lower background signal and higher thermostability than regular molecular beacons.

语种： 英文

作者： Yang, Gelan;Zhang, Yudong;Yang, Jiquan;Ji, Genlin;Dong, Zhengchao;Wang, Shuihua;Feng, Chunmei;Wang, Qiong

期刊： Multimedia Tools and Applications,2016年75(23):15601-15617 ISSN：1380-7501

通讯作者： Zhang, YD

作者机构： [Zhang, Yudong; Wang, Shuihua; Ji, Genlin] Nanjing Normal Univ, Sch Comp Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China.;[Zhang, Yudong; Feng, Chunmei; Wang, Qiong; Yang, Jiquan] Jiangsu Key Lab 3D Printing Equipment & Mfg, Nanjing 210042, Jiangsu, Peoples R China.;[Dong, Zhengchao] Columbia Univ, Translat Imaging Div, New York, NY 10032 USA.;[Dong, Zhengchao] Columbia Univ, MRI Unit, New York, NY 10032 USA.;[Dong, Zhengchao] New York State Psychiat Inst & Hosp, New York, NY 10032 USA.

通讯机构： [Zhang, Yudong] Nanjing Normal Univ, Sch Comp Sci & Technol, Nanjing 210023, Jiangsu, Peoples R China.;[Zhang, Yudong] Jiangsu Key Lab 3D Printing Equipment & Mfg, Nanjing 210042, Jiangsu, Peoples R China.

关键词： Automated classification - Biogeography-based optimizations - Biogeographybased optimizations (BBO) - Brain images - Cross validation - Feature descriptors - Wavelet energy

摘要： It is very important to early detect abnormal brains, in order to save social and hospital resources. The wavelet-energy was a successful feature descriptor that achieved excellent performances in various applications;hence, we proposed a novel wavelet-energy based approach for automated classification of MR brain images as normal or abnormal. SVM was used as the classifier, and biogeography-based optimization (BBO) was introduced to optimize the weights of the SVM. The results based on a 5 ×5-fold cross validation showed the performance of the proposed BBO-KSVM was superior to BP-NN, KSVM, and PSO-KSVM in terms of sensitivity and accuracy. The study offered a new means to detect abnormal brains with excellent performance. ©2015, Springer Science+Business Media New York.

语种： 英文

作者： Ni, Qin;Qi, Liqun;Wang, Fei

期刊： IEEE TRANSACTIONS ON AUTOMATIC CONTROL,2008年53(5):1096-1107 ISSN：0018-9286

通讯作者： Ni, Q.(niqfs@nuaa.edu.cn)

作者机构： [Qi, Liqun] Department of Applied Mathematics, The Hong Kong Polytechnic University, Hong Kong, Hong Kong;[Wang, Fei] Department of Mathematics, Hunan City University, Yiyang, Hunan 413000, China;[Ni, Qin] Department of Mathematics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

通讯机构： [Ni, Qin] Nanjing Univ Aeronaut & Astronaut, Dept Math, Nanjing 210016, Peoples R China.

关键词： Eigenvalue method - Positive definiteness - Supersymmetric tensor - Symmetric hyperdeterminant

摘要： In this paper, we present an eigenvalue method for testing positive definiteness of a multivariate form. This problem plays an important role in the stability study of nonlinear autonomous systems via Lyapunov's direct method in automatic control. At first we apply the D'Andrea-Dickenstein version of the classical Macaulay formulas of the resultant to compute the symmetric hyperdeterminant of an even order supersymmetric tensor. By using the supersymmetry property, we give detailed computation procedures for the Bezoutians and specified ordering of monomials in this approach. We then use these formulas to calculate the characteristic polynomial of a fourth order three dimensional supersymmetric tensor and give an eigenvalue method for testing positive definiteness of a quartic form of three variables. Some numerical results of this method are reported. ©2008 IEEE.

语种： 英文

作者： Wang, Weiyan;Yang, Yunquan;Luo, Hean;Peng, Huizou;Wang, Feng

期刊： Industrial and Engineering Chemistry Research,2011年50(19):10936-10942 ISSN：0888-5885

通讯作者： Yang, YQ

作者机构： [Wang, Weiyan; Peng, Huizou; Wang, Feng; Yang, Yunquan; Luo, Hean] School of Chemical Engineering, Xiangtan University, Xiangtan City, Hunan 411105, China;[Wang, Feng] Department of Chemical and Environment Engineering, Hunan City University, Yiyang, 413000, China

通讯机构： [Yang, Yunquan] Xiangtan Univ, Sch Chem Engn, Xiangtan 411105, Hunan, Peoples R China.

关键词： Active site - Amorphous catalysts - Catalyst surfaces - Chemical reduction - Clear fuels - European regulation - Hydrodeoxygenation - Surface area

摘要： Ni-W-B and La-promoted Ni-W-B amorphous catalysts were prepared by chemical reduction and applied within the hydrodeoxygenation (HDO) of phenol. The resulting catalysts were characterized by surface area, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results showed that some of the electrons were transferred from B⁰ to Ni⁰ in Ni-W-B amorphous catalyst. La promoted the reduction of Ni²⁺ to Ni⁰ and increased the WO<inf>3</inf> content on the catalyst surface. Adding appropriate La in Ni-W-B amorphous catalyst improved the amorphous degree of the catalyst, but excess amounts of La covered some active sites and decreased the catalyst surface area. The HDO of phenol on these amorphous catalysts proceeded via the hydrogenation-dehydration route, leading to no benzene in the products, which could meet the standard of clear fuel in European regulation. La-Ni-W-B amorphous catalysts exhibited higher activities in theHDOof phenol than Ni-W-B amorphous catalyst. &copy;2011 American Chemical Society.

语种： 英文

作者： Zhang Zaiyun;Li Yunxiang;Liu Zhenhai;Miao Xiujin

期刊： COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION,2011年16(8):3097-3106 ISSN：1007-5704

通讯作者： Zhang, Z.-Y.(zhangzaiyun1226@126.com)

作者机构： [Liu Zhenhai] School of Mathematics and Computer Science, Guangxi University for Nationalities, Nanning, 530006 Guangxi, China;[Miao Xiujin; Zhang Zaiyun] School of Mathematical Sciences and Computing Technology, Central South University, Changsha, Hunan 410075, China;[Li Yunxiang] Department of Mathematics, Hunan City University, Yiyang, Hunan 413000, China

通讯机构： [Zhang, Zai-yun] Cent S Univ, Sch Math Sci & Comp Technol, Changsha 410075, Hunan, Peoples R China.

关键词： Exact solutions;NLSE with Kerr law nonlinearity;Modified trigonometric function series method (MTFSM)

摘要： In this paper, the modified trigonometric function series method is employed to solve the perturbed nonlinear Schrodingers equation (NLSE) with Kerr law nonlinearity. Exact traveling wave solutions are obtained. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.

语种： 英文

作者： Wang, Jiaoliang;Long, Liping;Xie, Dan;Zhan, Youwen

期刊： Journal of Luminescence,2013年139:40-46 ISSN：0022-2313

通讯作者： Long, L.(llping401@163.com)

作者机构： [Long, Liping; Zhan, Youwen; Xie, Dan; Wang, Jiaoliang] College of Chemistry and Environment Engineering, Hunan City University, Yiyang, Hunan 413000, China

通讯机构： [Long, Liping] Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China.

关键词： Chemsensor;Hydrogen sulfide;CuS;Cell imaging

摘要： A displacement method of detecting hydrogen sulfide in aqueous media based on complex L-Cu ensemble is developed. Once combined with Cu²⁺, complex L-Cu displayed high specificity for sulfide anion. Among the various anions, only sulfide anion induce the revival of fluoresecence of compound L, which is quenched by Cu²⁺, resulting in turn-on type sensing sulfide anion. Complex L-Cu exhibits a highly sensitive fluorescent response toward S^2- by releasing compound L to give a remarkable change with 20-fold fluorescence intensity enhancement under 2 equivalent of S^2- added in Tris-HCl/ DMF (20 mM, 6/4, v/v), and also exhibits a dynamic response range for S^2- from 5&times;10^-7 to 5&times;10^-6 M, with a detection limit of 0.18 &mu;M. In addition, the turn-on fluorescent change upon the addition of S^2- is also applied in cell imaging.&copy;2013 PublishedbyElsevierB.V.

语种： 英文

作者： Lin, Li;Huang, Manhong;Long, Liping;Sun, Zhe;Zheng, Wei;Chen, Donghui

期刊： Ceramics International,2014年40(8):11493-11501 ISSN：0272-8842

通讯作者： Chen, DH

作者机构： [Huang, Manhong; Lin, Li; Chen, Donghui; Zheng, Wei; Sun, Zhe] School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;[Lin, Li; Long, Liping] School of Chemical and Environmental Engineering, Hunan City University, Yiyang 413000, China

通讯机构： [Chen, Donghui] Donghua Univ, Sch Environm Sci & Engn, Shanghai 201620, Peoples R China.

关键词： BiOBr/BiOI;Photocatalyst;Rhodamine B;Tetracycline;Visible light

摘要： Three-dimensional (3D) BiOBr/BiOI hierarchical microsphere photocatalysts were successfully synthesized via a facile one-pot solvothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), UV-vis diffuse reflectance spectroscopy (UV-vis DRS) and N<inf>2</inf> adsorption-desorption isotherms. The photocatalytic activity was evaluated by the photocatalytic degradation of Rhodamine B (RhB) and tetracycline (TC) under visible light irradiation (&lambda;&gt;420 nm). The 50% BiOBr/BiOI composite showed a higher photocatalytic removal efficiency of RhB and TC than 10% and 90% BiOBr/BiOI composites. RhB (C<inf>0</inf>=15 mg/L) was degraded completely within 40 min and over 83% of TC (C<inf>0</inf>= 40 mg/L) was degraded within 50 min using a catalyst quantity of 0.4 g/L of 50% BiOBr/BiOI. The enhanced photocatalytic activity of the 50:50 composite was attributed to effective separation of photogenerated carriers and the balance between enhanced visible light absorption and decreased valence band (VB) edge potential. &copy;2014 Elsevier Ltd and Techna Group S.r.l.

语种： 英文

作者： Deng, Hanyuan;Chen, Shubo

期刊： MATCH-COMMUNICATIONS IN MATHEMATICAL AND IN COMPUTER CHEMISTRY,2008年59(1):171-190 ISSN：0340-6253

通讯作者： Deng, HY

作者机构： [Chen, Shubo] Hunan City Univ, Dept Math, Yiyang 413000, Hunan, Peoples R China.;[Deng, Hanyuan] Hunan Normal Univ, Coll Math & Comp Sci, Changsha 410081, Hunan, Peoples R China.

通讯机构： [Deng, Hanyuan] Hunan Normal Univ, Coll Math & Comp Sci, Changsha 410081, Hunan, Peoples R China.

摘要： The Hosoya index and the Merrifield-Simmons index of a graph are defined as the total numbers of its matchings and its independent sets, respectively. In this paper, we characterize the unicyclic graphs with extremal Hosoya indices and Merrifield-Simmons indices, respectively.

语种： 英文

作者： Zhang, Zhehua;Liu, Changhui;Bai, Junhui;Wu, Cuichen;Xiao, Yue;Li, Yinhui;Zheng, Jing*;Yang, Ronghua;Tan, Weihong

期刊： ACS Applied Materials and Interfaces,2015年7(11):6211-6219 ISSN：1944-8244

通讯作者： Zheng, Jing

作者机构： [Liu, Changhui] Department of Chemistry and Environmental Engineering, Hunan City University, Yiyang, China;[Xiao, Yue; Zhang, Zhehua; Bai, Junhui; Li, Yinhui; Liu, Changhui; Tan, Weihong; Zheng, Jing; Yang, Ronghua] State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, China;[Wu, Cuichen; Tan, Weihong] Department of Chemistry, UF Genetics Institute, University of Florida, Gainesville, FL, United States;[Yang, Ronghua] School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, China

通讯机构： [Zheng, Jing] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.

关键词： mesoporous silica nanoparticles;gold nanorods;silver nanoparticle;GSH;photothermal therapy;photodynamic therapy

摘要： Multifunctional nanoparticles integrated with an imaging module and therapeutic drugs are promising candidates for future cancer diagnosis and therapy. Mesoporous silica coated gold nanorods (AuNR@MS) have emerged as a novel multifunctional cancer theranostic platform combining the large specific surface area of mesoporous silica, which guarantees a high drug payload, and the photothermal modality of AuNRs. However, premature release and side effects of exogenous stimulus still hinder the further application of AuNR@MS. To address these issues, herein, we proposed a glutathione (GSH)-responsive multifunctional AuNR@MS nanocarrier with in situ formed silver nanoparticles (AgNPs) as the capping agent. The inner AuNR core functions as a hyperthermia agent, while the outer mesoporous silica shell exhibits the potential to allow a high drug payload, thus posing itself as an effective drug carrier. With the incorporation of targeting aptamers, the constructed nanocarriers show drug release in accordance with an intracellular GSH level with maximum drug release into tumors and minimum systemic release in the blood. Meanwhile, the photothermal effect of the AuNRs upon application to near-infrared (NIR) light led to a rapid rise in the local temperature, resulting in an enhanced cell cytotoxicity. Such a versatile theranostic system as AuNR@MS@AgNPs is expected to have a wide biomedical application and may be particularly useful for cancer therapy. &copy;2015 American Chemical Society.

语种： 英文

作者： Qianhong Zhang;Lihui Yang;Jingzhong Liu

期刊： Advances in Difference Equations,2012年2012(1):136- ISSN：1687-1847

通讯作者： Zhang, Qianhong

作者机构： [Jingzhong Liu] Hunan Inst Technol, Comp & Informat Sci Dept, Hengyang 421002, Hunan, Peoples R China.;[Qianhong Zhang] Guizhou Univ Finance & Econ, Guizhou Key Lab Econ Syst Simulat, Sch Math & Stat, Guiyang 550004, Guizhou, Peoples R China.;[Lihui Yang] Hunan City Univ, Dept Math, Yiyang 413000, Hunan, Peoples R China.

通讯机构： [Zhang, Qianhong] Guizhou Univ Finance & Econ, Guizhou Key Lab Econ Syst Simulat, Sch Math & Stat, Guiyang 550004, Guizhou, Peoples R China.

关键词： difference equation;local behavior;unstable

摘要： In this paper, we study the dynamical behavior of positive solution for a system of a rational third-order difference equation Xn+1 = Xn-2/B + Yn-2Yn-1Y2, Yn+1 = Yn-2/A + Xn-2Xn-1Xn, n = 0,1, ..., where A, B is an element of (0,infinity), X-2, X-1, X-0 is an element of (0,infinity); Y-2, Y-1, Y-0 is an element of (0,infinity)

语种： 英文

作者： Xiao, Guqing;Fu, Lichun;Li, Aimin

期刊： Chemical Engineering Journal,2012年191:171-176 ISSN：1385-8947

通讯作者： Li, AM

作者机构： [Fu, Lichun; Xiao, Guqing; Li, Aimin] State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;[Xiao, Guqing] College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, China

通讯机构： [Li, Aimin] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, Peoples R China.

关键词： Hyper-cross-linked polymeric adsorbent;Acetylaniline;Bisphenol A;Adsorption

摘要： A novel hyper-cross-linked polymeric adsorbent modified with acetylaniline as the cross-linked bridge (denoted GQ-02) was synthesized for the enhanced removal of bisphenol A (BPA) from aqueous solution. Its chemical structure and pore structure were characterized by infrared spectroscopy and surface area analysis. Results showed that the adsorption capacity of BPA onto GQ-02 was larger than that of the commercial resins NDA-150, H103, NDA-88, NDA-99, and XAD-4 due to the cross-linked bridge of acetylaniline uploaded on GQ-02 resin. The solution pH had no significant effect on the adsorption capacity until it was higher than 6.39. The adsorption rate of GQ-02 was greater than that of H103 because of the longer cross-linked bridge between two benzene rings. The adsorption isotherms could be correlated to the Langmuir equation. More favorable adsorption of BPA onto GQ-02 than H103 was further demonstrated by thermodynamic analysis. Nearly 100% regeneration efficiency for GQ-02 was achieved by 80% ethanol and 0.5 mol/L NaOH. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.

语种： 英文

作者： Wang, Xin;Fang, Jian-an*;Mao, Huanyu;Dai, Anding

期刊： Nonlinear Dynamics,2015年79(1):47-61 ISSN：0924-090X

通讯作者： Fang, Jian-an

作者机构： [Mao, Huanyu; Wang, Xin] School of Information Engineering, Zhejiang Textile and Fashion College, Ningbo, Zhejiang, China;[Wang, Xin; Fang, Jian-an] College of Information Science and Technology, Donghua University, Shanghai, China;[Dai, Anding] School of Mathematics and Computer Science, Hunan City University, Yiyang, Hunan, China

通讯机构： [Fang, Jian-an] Donghua Univ, Coll Informat Sci & Technol, Shanghai 201620, Peoples R China.

关键词： Finite time - Global synchronization - Linear feedback controllers - Markovian jumps - Matrix theory - Stochastic analysis - Stochastic noise - Transition rates

摘要： This paper presents a framework for finite-time global synchronization of Markovian jump complex networks (MJCNs) with partially unknown transition rates, time-delays and stochastic noises. Several criteria for finite-time global synchronization are given by using the stochastic analysis techniques and matrix theory. These criteria provide a feasible approach to design linear feedback controller and to compute finite-time of global synchronization for the addressed MJCNs. Four numerical examples are given to demonstrate the effectiveness of the theoretical results.

语种： 英文

作者： Li Wenbin;Pan Qinglin;Xiao Yanping;He Yunbin;Liu Xiaoyan

期刊： Transactions of Nonferrous Metals Society of China,2011年21(10):2127-2133 ISSN：1003-6326

通讯作者： Pan, Q.-L.(pql@mail.csu.edu.cn)

作者机构： [Xiao Yanping; Li Wenbin; Liu Xiaoyan; He Yunbin; Pan Qinglin] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[Li Wenbin] School of Civil Engineering, Hunan City University, Yiyang 413000, China

通讯机构： [Pan Qing-lin] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China.

关键词： Al-Zn-Cu-Mg-Sc-Zr alloy;homogenization;microstructural evolution;overburnt temperature;homogenization kinetics

摘要： The microstructural evolution and composition distribution of an Al-Zn-Cu-Mg-Sc-Zr alloy during homogenization were investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that severe dendritic segregation exists in Al-Zn-Cu-Mg-Sc-Zr alloy ingot. There are a lot of eutectic phases at grain boundary and the distribution of the main elements varies periodically along interdendritic region. The main eutectic phases at grain boundary are Al <inf>7</inf>Cu<inf>2</inf>Fe phase and T (Al<inf>2</inf>Mg<inf>3</inf>Zn <inf>3</inf>). The residual phases are dissolved into the matrix gradually during homogenization with increasing temperature and prolonging holding time, which can be described by a constitutive equation in exponential function. The overburnt temperature of the alloy is 473.9 &deg;C. The optimum parameters of homogenization are 470 &deg;C and 24 h, which is consistent with the result of homogenization kinetic analysis. &copy;2011 The Nonferrous Metals Society of China.

语种： 英文

作者： Wang, Jiaoliang;Long, Liping;Xie, Dan;Song, Xiaofeng

期刊： Sensors and Actuators, B: Chemical,2013年177:27-33 ISSN：0925-4005

通讯作者： Long, LP

作者机构： [Long, Liping; Song, Xiaofeng; Xie, Dan; Wang, Jiaoliang] College of Chemistry and Environment Engineering, Hunan City University, Yiyang, Hunan 413000, China

通讯机构： [Long, Liping] Hunan City Univ, Coll Chem & Environm Engn, Yiyang 413000, Hunan, Peoples R China.

关键词： Fluorescence chemsensor;Copper(II);Binding;Imaging

摘要： A rhodamine-based fluorescence chemsensor bearing the 8-hydroxyquinoline unit is developed as a reversible turn-on chemosensor for Cu²⁺. It exhibits a highly sensitive fluorescent response toward Cu²⁺ in aqueous media with an 80-fold fluorescence intensity enhancement under 10 equiv. of Cu²⁺ added. This indicates that the synthesized chemosensor effectively avoided the fluorescence quenching for the paramagnetic nature of Cu²⁺ via its strong binding capability toward Cu²⁺. The chemosensor Rh-Q exhibits a dynamic response range for Cu²⁺ from 2 &times;10^-7 to 5 &times;10^-5 M, with a detection limit of 0.19 &mu;M, and good selectivity for Cu²⁺ over other heavy and transition metal (HTM) ions in Tris-HCl/EtOH (7:3, v/v, pH 7.4). In addition, the turn-on fluorescent change upon the addition of Cu²⁺ is also applied in cell imaging. &copy;2012 Elsevier B.V. All rights reserved.

语种： 英文

作者： Chen, Yaoning;Zhou, Wei;Li, Yuanping;Zhang, Jiachao;Zeng, Guangming;Huang, Aizhi;Huang, Jingxia

期刊： Applied Microbiology and Biotechnology,2014年98(9):4233-4243 ISSN：0175-7598

通讯作者： Chen, Y.(cyn@hnu.edu.cn)

作者机构： [Huang, Jingxia; Zeng, Guangming; Huang, Aizhi; Chen, Yaoning; Zhou, Wei; Li, Yuanping] College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;[Huang, Jingxia; Zeng, Guangming; Huang, Aizhi; Chen, Yaoning; Zhou, Wei; Li, Yuanping] Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;[Zhang, Jiachao] College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China;[Li, Yuanping] College of Chemistry and Environment Engineering, Hunan City University, Yiyang, Hunan 413000, China

通讯机构： [Chen, Yaoning] College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China,

关键词： Denitrifying bacteria - Nitrite reductase genes - PCR-DGGE - Phylogenetic analysis - Physicochemical parameters - Polymerase chain reaction-denaturing gradient gel electrophoreses (PCR-DGGE) - RDA - Redundancy analysis (RDA)

摘要： The purpose of this study was to investigate the diversity of denitrifier community during agricultural waste composting. The diversity and dynamics of the denitrifying genes (nirK and nirS) were determined using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). Relationships between physico-chemical parameters and denitrifying genes structures were simultaneously evaluated by redundancy analysis (RDA). Phylogenetic analysis indicated that nirK clones grouped into six clusters and nirS clones into two major clusters, respectively. The results showed a very high diversity of nir gene sequences within composting samples. RDA showed that the nirK and nirS gene structures were significantly related to pH and pile temperature (P &lt;0.05). Significant amounts of the variation (49.2 and 38.3 % for nirK and nirS genes, respectively) were explained by pH and pile temperature, suggesting that those two parameters were the most likely ones to influence, or be influenced by the denitrifiers harboring nirK and nirS genes. &copy;2014 Springer-Verlag.

语种： 英文

作者： YU-MING CHU;MIAO-KUN WANG;SONG-LIANG QIU

期刊： Proceedings of the Indian Academy of Sciences: Mathematical Sciences,2012年122(1):41-51 ISSN：0253-4142

通讯作者： Chu, Y.-M.(chuyuming@hutc.zj.cn)

作者机构： [YU-MING CHU] Department of Mathematics and Computing Science, Hunan City University, Yiyang 413000, China;[MIAO-KUN WANG] Department of Mathematics, Huzhou Teachers College, Huzhou 313000, China;[SONG-LIANG QIU] Department of Mathematics, Zhejiang Sci-Tech University, Hangzhou 310018, China

通讯机构： [Chu, Yu-Ming] Hunan City Univ, Dept Math & Comp Sci, Yiyang 413000, Peoples R China.

关键词： Arithmetic mean - Elementary function - Elliptic integrals - Least value - Optimal combination - Positive numbers - Root-square mean - Toader mean

摘要： We find the greatest values &alpha;<inf>1</inf> and &alpha;<inf>2</inf>, and the least values &beta;1 and &beta;2, such that the double inequalities &alpha;<inf>1</inf>S(a, b) + (1 - &alpha;<inf>1</inf>)A(a, b) &lt;T (a, b) &lt;&beta;<inf>1</inf>S(a, b) + (1 - &beta;<inf>1</inf>)A(a, b) and S^&alpha;2 (a, b)A^1-&alpha;2 (a, b) &lt;T (a, b) &lt;S^&beta;2 (a, b)A^1-&beta;2 (a, b) hold for all a, b &gt;0 with a &ne;b. As applications, we get two new bounds for the complete elliptic integral of the second kind in terms of elementary functions. Here, S(a, b) = [(a² +b²)/2]^1/2, A(a, b) = (a +b)/2, and T (a, b) = 2/&pi;^&pi;/2&int;<inf>0</inf> &radic;a²cos² &theta;+ b²sin² &theta;d&theta;denote the root-square, arithmetic, and Toader means of two positive numbers a and b, respectively. &copy;Indian Academy of Sciences.

语种： 英文

作者： Li, Yong-Min;Long, Bo-Yong;Chu, Yu-Ming

期刊： JOURNAL OF MATHEMATICAL INEQUALITIES,2012年6(4):567-577 ISSN：1846-579X

通讯作者： Li, YM

作者机构： [Chu, Yu-Ming] Hunan City Univ, Sch Math & Computat Sci, Yiyang 413000, Peoples R China.;[Li, Yong-Min] Huzhou Teachers Coll, Dept Math, Huzhou 313000, Peoples R China.;[Long, Bo-Yong] Anhui Univ, Sch Math Sci, Hefei 230039, Peoples R China.

通讯机构： [Li, Yong-Min] Huzhou Teachers Coll, Dept Math, Huzhou 313000, Peoples R China.

关键词： Neuman-Sandor mean;generalized logarithmic mean;power mean;Seiffert mean

摘要： In this paper, we find the largest value alpha and least value beta such that the double inequality L-alpha(a,b) < M(a,b) < L-beta(a,b) holds for all a,b > 0 with a not equal b. Here, M(a,b) and L-p(a,b) are the Neuman-Sandor and p-th generalized logarithmic means of a and b, respectively.

语种： 英文

作者： Long, Fei

期刊： Nonlinear Analysis: Real World Applications,2012年13(2):686-693 ISSN：1468-1218

通讯作者： Long, F

作者机构： [Long, Fei; Long, F] Hunan City Univ, Dept Math & Comp Sci, Yiyang 413000, Hunan, Peoples R China.

通讯机构： [Long, Fei] Hunan City Univ, Dept Math & Comp Sci, Yiyang 413000, Hunan, Peoples R China.

关键词： Almost periodic solutions - Exponential convergence - Fixed point theorems - Lyapunov functional method - Multiple time varying delays - Nicholson's Blowflies models

摘要： In this paper, we study the problem of positive almost periodic solutions for the generalized Nicholson's blowflies model with a linear harvesting term and multiple time-varying delays. By applying the fixed point theorem and the Lyapunov functional method, we establish some criteria to ensure that the solutions of this model converge locally exponentially to a positive almost periodic solution. Moreover, we give an example to illustrate our main results. &copy;2011 Elsevier Ltd. All rights reserved.

语种： 英文