作者： 王勇;任文辉

期刊： 中国教育学刊,2019年(6):I0030-I0030 ISSN：1002-4808

作者机构： 湖南农业大学理学院;[王勇; 任文辉] 湖南农业大学

关键词： 实验教学研究;大学物理;普通高中物理课程标准;基础教育课程改革;高等师范院校;实验教学技能;科学出版社;实践

摘要： 《物理实验教学研究》一书是科学出版社出版的“高等师范院校新世纪教材·学科课程与教学论系列”丛书之一,是为适应21世纪基础教育课程改革而编写的物理学专业必修教材.《物理实验教学研究》一书以教育部在2003年4月颁发的《普通高中物理课程标准(实验稿)》为纲,同时兼顾教育部2000年颁发的《全日制中学物理教学大纲》,密切联系基础物理实验教学实际,突出对高等师范院校物理学专业学生物理实验教学技能的训练与物理实验教学研究能力的培养,以使高师学生较为灵活、深入地学习物理实验教学的有关理论、方法和技能.

语种： 中文

作者： Zhou, Nan;Wang, Yifan;Yao, Denghui;Li, Shikai;Tang, Jiajie;...

期刊： Journal of Cleaner Production,2019年221:63-72 ISSN：0959-6526

通讯作者： Zhong, Mei-e;Zhou, Zhi

作者机构： [Zhong, Mei-e; Zhong, ME; Zhou, Zhi; Li, Shikai; Zhu, Xiaoyu; Shen, Da; Huang, Liyang; Zhou, Nan; Yao, Denghui; Wang, Yifan; Tang, Jiajie] Hunan Agr Univ, Coll Sci, Furong Rd, Changsha 410128, Hunan, Peoples R China.;[Zhong, Mei-e; Zhou, Nan; Zhou, Zhi; Wang, Yifan] Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha 410128, Hunan, Peoples R China.;[Zhou, Nan; Zhou, Zhi; Yao, Denghui] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.

通讯机构： [Zhong, ME; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Furong Rd, Changsha 410128, Hunan, Peoples R China.

关键词： Activation energy;Adsorption;Cadmium compounds;Carbonization;Heavy metals;Hydrogen bonds;Pyrolysis;Sodium Carbonate;Sodium compounds;Soil pollution control;Acidic catalysts;Adsorption properties;Bio chars;Biochar adsorbents;Cadmium adsorption;Heavy metal remediation;Removal efficiencies;Surface functional groups;Ion exchange

摘要： The enhancement of surface functional groups of biochar is essential to improving the biochar contaminant adsorption. Current pyrolysis methods that are accompanied by activation are energy consuming and costly. Herein, a novel wet-pyrolysis system that was carried out in open air, with simultaneous conversion and modification to produce an effective biochar adsorbent, is described. Within this system, the surface of the biochar was oxidized partially to produce sufficient functional groups at the surface, whereas carbonization of the biomass (miscanthus sacchariflora) occurs under an acidic catalyst. The characteristic results confirmed the attachment of abundant surface functional groups, including hydroxyl and carboxyl groups, which increased in content with the ongoing reaction time. Neutralization with sodium carbonate removed the hydrogen bonds and enhanced the adsorption properties. The biochar that was obtained by using this technique exhibited an excellent cadmium adsorption capacity of 197 mg.g −1 and a high removal efficiency of 99%. Analysis of the Cd-loaded biochar indicated that adsorption occurred via ion exchange, and formed cadmium complexes. It could be concluded that this novel wet-pyrolysis system is a promising approach to produce biochar efficiently and cost-effectively for heavy-metal remediation. © 2019 Elsevier Ltd

语种： 英文

作者： Zeng, Tianqin;Yu, Yong;Li, Zefan;Zuo, Jiangtao;Kuai, Zeyuan;...

期刊： Materials Chemistry and Physics,2019年231:105-108 ISSN：0254-0584

通讯作者： Peng, Chang

作者机构： [Peng, Chang; Wu, Anjun; Kuai, Zeyuan; Jin, Yang; Wang, Yehe; Li, Zefan; Yu, Yong; Zuo, Jiangtao; Zeng, Tianqin] Hunan Agr Univ, Coll Sci, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Peng, Chang] H;Hunan Agr Univ, Coll Sci, Changsha 410082, Hunan, Peoples R China.

关键词： Adsorption;Heavy metals;Hydrogels;Manganese oxide;Metal ions;Morphology;Nanotubes;Yarn;3D porous nanostructures;Adsorption capacities;Adsorption performance;Reduced graphene oxides;Reduced graphene oxides (RGO);Removal of heavy metal ions;Reusable adsorbents;Three dimensional (3D) architectures;Graphene

摘要： In this work, MnO2 nanotubes@reduced graphene oxide hydrogel (MNGH) was prepared via one-step hydrothermal co-assembly approach. The as-prepared MNGH exhibited three-dimensional (3D) architecture with a high surface area of 156 m2 g−1. By characterization of the morphology of MNGH, MnO2 nanotubes with uniform size (∼20 nm) were wrapped by interconnected porous reduced graphene oxide (rGO) sheets. Benefiting from the 3D porous nanostructure as well as the synergetic action between rGO and MNTs, the MNGH sample showed decent adsorption ability for various heavy metal ions (Pb2+, Cd2+, Ag+, Cu2+ and Zn2+). Especially, the adsorption capacity of Pb2+ on MNGH can reach 356.37 mg g−1 and the sorption datum fits the Langmuir model. Moreover, the adsorption performance of MNGH can be maintained after multiple regeneration experiments. These results demonstrated that the as-prepared MNGH could be applied as the promising adsorbent for removal of heavy metal ions. © 2019 Elsevier B.V.

语种： 英文

作者： Wang, Youming*;Yang, Fei;Zhang, Song;Liao, Liangwen

期刊： DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS,2019年39(9):5185-5206 ISSN：1078-0947

通讯作者： Wang, Youming

作者机构： [Wang, Youming; Liao, Liangwen; Yang, Fei] Nanjing Univ, Dept Math, Nanjing 210093, Jiangsu, Peoples R China.;[Wang, Youming] Hunan Agr Univ, Dept Appl Math, Changsha 410128, Hunan, Peoples R China.;[Zhang, Song] Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China.

通讯机构： [Wang, Youming] N;[Wang, Youming] H;Nanjing Univ, Dept Math, Nanjing 210093, Jiangsu, Peoples R China.;Hunan Agr Univ, Dept Appl Math, Changsha 410128, Hunan, Peoples R China.

关键词： Singular perturbation;Julia sets;Cantor circles;connectivity;Hausdorff dimension

摘要： <p style='text-indent:20px;'>In this paper, we investigate the dynamics of the following family of rational maps</p><p style='text-indent:20px;'><disp-formula> <label/> <tex-math id="FE1"> \begin{document}$ \begin{equation*} f_{\lambda}(z) = \frac{z^{2n} - \lambda^{3n+1}}{z^n(z^{2n} - \lambda^{n - 1})} \end{equation*} $\end{document} </tex-math> </disp-formula></p><p style='text-indent:20px;'>with one parameter <inline-formula><tex-math id="M1">\begin{document}$ \lambda \in \mathbb{C}^* - \{\lambda: \lambda^{2n + 2} = 1\} $\end{document}</tex-math></inline-formula>, where <inline-formula><tex-math id="M2">\begin{document}$ n\geq 2 $\end{document}</tex-math></inline-formula>. This family of rational maps is viewed as a singular perturbation of the bi-critical map <inline-formula><tex-math id="M3">\begin{document}$ P_{-n}(z) = z^{-n} $\end{document}</tex-math></inline-formula> if <inline-formula><tex-math id="M4">\begin{document}$ \lambda \neq 0 $\end{document}</tex-math></inline-formula> is small. It is proved that the Julia set <inline-formula><tex-math id="M5">\begin{document}$ J(f_\lambda) $\end{document}</tex-math></inline-formula> is either a quasicircle, a Cantor set of circles, a Sierpiński carpet or a degenerate Sierpiński carpet provided the free critical orbits of <inline-formula><tex-math id="M6">\begin{document}$ f_\lambda $\end{document}</tex-math></inline-formula> are attracted by the super-attracting cycle <inline-formula><tex-math id="M7">\begin{document}$ 0\leftrightarrow\infty $\end{document}</tex-math></inline-formula>. Furthermore, we prove that there exists suitable <inline-formula><tex-math id="M8">\begin{document}$ \lambda $\end{document}</tex-math></inline-formula> such that <inline-formula><tex-math id="M9">\begin{document}$ J(f_\lambda) $\end{document}</tex-math></inline-formula> is a Cantor set of circles but the dynamics of <inline-formula><tex-math id="M10">\begin{document}$ f_{\lambda} $\end{document}</tex-math></inline-formula> on <inline-formula><tex-math id="M11">\begin{document}$ J(f_{\lambda}) $\end{document}</tex-math></inline-formula> is not topologically conjugate to that of any known rational maps with only one or two free critical orbits (including McMullen maps and the generalized McMullen maps). The connectivity of <inline-formula><tex-math id="M12">\begin{document}$ J(f_{\lambda}) $\end{document}</tex-math></inline-formula> is also proved if the free critical orbits are not attracted by the cycle <inline-formula><tex-math id="M13">\begin{document}$ 0\leftrightarrow\infty $\end{document}</tex-math></inline-formula>. Finally we give an estimate of the Hausdorff dimension of the Julia set of <inline-formula><tex-math id="M14">\begin{document}$ f_\lambda $\end{document}</tex-math></inline-formula> in some special cases.</p>

语种： 英文

作者： Peng, Chang;Zeng, Tianqin;Yu, Yong;Li, Zefan;Zuo, Jiangtao;...

期刊： Ceramics International,2019年45(7):9320-9324 ISSN：0272-8842

通讯作者： Li, Ling

作者机构： [Peng, Chang; Li, Ling; Kuai, Zeyuan; Jin, Yang; Wang, Yehe; Li, Zefan; Yu, Yong; Zuo, Jiangtao; Zeng, Tianqin] Hunan Agr Univ, Coll Sci, Changsha 410082, Hunan, Peoples R China.;[Peng, Chang] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.

通讯机构： [Li, Ling] H;Hunan Agr Univ, Coll Sci, Changsha 410082, Hunan, Peoples R China.

关键词： Light controlled self-assembly;Morphological patterns;Reversible photoresponse

摘要： Herein we present a novel light-controlled assembly system, which is fabricated by functionalizing silica nanoparticles with coumarin. This system exhibits reversible morphological changes under alternating irradiation with 365 nm and 254 nm light: scattered distribution pattern, firework-shaped pattern, honeycomb pattern and donut-like pattern, due to the reversible photodimerization and photocleavage of coumarin. Furthermore, this system displays reversibly controllable wettability, which can be transformed between hydrophobic and superhydrophobic upon UV light illumination based on the photoresponsive of coumarin as well. The system with these interesting characteristics provides potential applications in the synthesis of controllable nanostructures by photo-regulation and self-cleaning fields. © 2019

语种： 英文

作者： Wu, Zhaohua;Wang, Yi;Zhou, Xiaoli;Zhou, Tiejun*

期刊： Mathematical Biosciences,2018年300:145-156 ISSN：0025-5564

通讯作者： Zhou, Tiejun

作者机构： [Wang, Yi; Zhou, Xiaoli; Wu, Zhaohua; Zhou, Tiejun] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Zhou, Tiejun] Hunan Agr Univ, Coll Orient Sci & Technol, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhou, Tiejun] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Coll Orient Sci & Technol, Changsha 410128, Hunan, Peoples R China.

关键词： Convergence of numerical methods;Differential equations;Ecosystems;Fertilizers;Phase equilibria;Artificial fertilizers;Bifurcation parameter;Bifurcation phenomena;Differential equation model;Inorganic fertilizers;Maximum yield of rice;Paddy ecosystems;Stability of equilibrium;Hopf bifurcation;fertilizer;agricultural ecosystem;bifurcation;crop production;extinction;farming system;fertilizer;herbivore;mortality;paddy field;rice;weed;Article;controlled study;crop production;farming system;herbivore;mathematical model;organismal interaction;plant yield;rice;species coexistence;species extinction;weed;animal;biological model;crop production;ecosystem;herbivory;Oryza;Animals;Crop Production;Ecosystem;Fertilizers;Herbivory;Models, Biological;Oryza;Plant Weeds

摘要： As one of the Globally Important Agricultural Heritage Systems (GIAHS), rice field composite farming is an ecological measure in rice production, which can reduce the amount of chemical fertilizers, pesticides and herbicides. This research studies the interaction among rice, weed, inorganic fertilizer and herbivore in a composite farming paddy ecosystem. We develop a differential equation model to analyze the relations and interactions among those components. Results show the existence of an equilibrium for paddy and weed extinction, one or two equilibria for rice extinction, an equilibrium for weed extinction, and an equilibrium for rice and weed coexistence. Based on the obtained stability conditions of these equilibria, measures are proposed to avoid the existence or the stability of equilibria for rice extinction. Other measures are proposed to lead to a stable equilibrium for weed extinction, which is the most desirable result in rice production. Conditions for maximizing the yield of rice are also obtained by taking the relative mortality of rice as variable. In addition, we discover the existence of Hopf bifurcation phenomenon in the system, and develop the critical value of Hopf bifurcation by taking the artificial fertilizer rate as the bifurcation parameter. Our findings provide effective guidance and insights for rice production in a composite farming paddy ecosystem. © 2018 Elsevier Inc.

语种： 英文

作者： Zhou, Tiejun*;Wang, Yi;Wang, Min

期刊： Neurocomputing,2016年171:482-491 ISSN：0925-2312

通讯作者： Zhou, Tiejun

作者机构： [Wang, Min; Zhou, Tiejun] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wang, Yi] Hunan Agr Univ, Coll Informat Sci & Technol, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhou, Tiejun] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Associative storage;Fixed point arithmetic;Memory architecture;Neural networks;Activation functions;Almost periodic solutions;Associative memory neural networks;Continuously distributed delays;Exponential dichotomy;Local exponential stability;Multi stabilities;Schauder's fixed point theorem;Associative processing;Article;correlation coefficient;exponential dichotomy;machine learning;mathematical analysis;mathematical model;mathematical parameters;mathematical variable;multidirectional associative memory neural network;multiplicity of almost periodic solutions;priority journal;probability;theory

摘要： In this paper, the multiplicity of almost periodic solutions is studied for a multidirectional associative memory (MAM) neural network with almost periodic coefficients and continuously distributed delays. Under some assumptions on activation functions, some invariant subsets of the MAM neural network are constructed. The existence of multiple almost periodic solutions are obtained by using the theory of exponential dichotomy and Schauder's fixed point theorem. Furthermore, a sufficient condition is derived for the local exponential stability of some almost periodic solutions and their exponential attracting domains are also given. An example is given to illustrate the effectiveness of the results. © 2015 Elsevier B.V.

语种： 英文

作者： Wang, Yi;Wang, Min;Zhou, Tiejun*

期刊： Neural Computing and Applications,2015年26(4):979-986 ISSN：0941-0643

通讯作者： Zhou, Tiejun

作者机构： [Wang, Yi] Hunan Agr Univ, Coll Informat Sci & Technol, Changsha 410128, Hunan, Peoples R China.;[Wang, Min; Zhou, Tiejun] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhou, Tiejun] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Associative processing;Associative storage;Mapping;Associative memory;Associative memory neural networks;Distributed delays;Global exponential stability;Periodic coefficients;Periodic solution;Time varying networks

摘要： A multidirectional associative memory (MAM) neural network with periodic coefficients and distributed delays is studied. By constructing a Poincaré mapping, some sufficient conditions are obtained ensuring existence, uniqueness and the global exponential stability of a periodic solution of MAM neural network. The result is new to MAM neural networks. An example is given to illustrate the effectiveness of the result. © 2014, The Natural Computing Applications Forum.

语种： 英文

作者： Tan, Yu;Wang, Yanguo*

期刊： 自然科学进展·国际材料(英文),2014年24(2):109-115 ISSN：1002-0071

通讯作者： Wang, Yanguo

作者机构： [Tan, Yu] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wang, Yanguo; Tan, Yu] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.;[Wang, Yanguo] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603, Beijing 100190, Peoples R China.

通讯机构： [Wang, Yanguo] C;Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603, Beijing 100190, Peoples R China.

关键词： Semiconductor nanowire;Electrical failure;Schottky barrier;Bias polarity;In situ TEM

摘要： The effect of bias polarity on the electrical breakdown behavior of the single ZnSe nanowire (NW) in the metal-semiconductor-metal (M-S-M) nanostructure under high current density and high bias conditions has been studied in the present paper. The experimental results show that the failure of the ZnSe NW in M-S-M nanostructure was sensitive to bias polarity since the NW commonly collapsed at the negatively biased Au metal electrode due to high Joule heat produced in NW at the reversely biased Schottky bather. Thus, the electrical breakdown behavior of the ZnSe NW was highly dominated by the cathode-controlled mode due to the high resistance of the depletion region of ZnSe NW at the reversely biased Schottky contact. (C) 2014 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.

语种： 英文

作者： 王勇;林智群;任文辉

期刊： 湖南农业大学学报(社会科学版),2013年(S2):51-53 ISSN：1009-2013

作者机构： 湖南农业大学理学院;[林智群; 王勇; 任文辉] 湖南农业大学

关键词： 物理;静电场;高斯定理;大学生;思维能力;培养

摘要： 以静电场中高斯定理的应用为例,探究物理课堂教学中如何精心设计,怎样提出问题,如何引导大学生去思考、去分析、去解决问题;探究如何运用讨论式和启发式教学方法,培养大学生思维能力、创新能力、分析问题和解决问题的能力。

语种： 中文

作者： Wang, Yong;Tang, Jianfeng;Ouyang, Xicheng;Liu, Buqiong*;Lin, Rong Han

期刊： Materials Research Bulletin,2013年48(6):2123-2127 ISSN：0025-5408

通讯作者： Liu, Buqiong

作者机构： [Ouyang, Xicheng; Tang, Jianfeng; Wang, Yong] Hunan Agr Univ, Dept Appl Phys, Changsha 410128, Hunan, Peoples R China.;[Liu, Buqiong] Hunan Agr Univ, Dept Grad Studies, Changsha 410128, Hunan, Peoples R China.;[Lin, Rong Han] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA.

通讯机构： [Liu, Buqiong] H;Hunan Agr Univ, Dept Grad Studies, Changsha 410128, Hunan, Peoples R China.

关键词： Fine particles;Growth mechanisms;Hexagonal shapes;Industrial production;Photoluminescence properties;Photoluminescence spectrum;PL intensity;Powder X ray diffraction;Chemical bonds;Computer simulation;Electronegativity;Light emission;Particle size;Photoluminescence;Scanning electron microscopy;Solid state reactions;X ray diffraction;Phosphors

摘要： The AlN-doped BaMgAl10O17:Eu2+ phosphors were synthesized by conventional solid-state reaction. Powder X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence spectrum (PL) were used for characterization. The growth mechanism was carried out by computer simulation with CASTEP application, and revealed that an ideal hexagonal shape, particle size in 5 μm and 2.5-3 μm in thickness, could be obtained by AlN doping. Additionally, due to the low electronegativity of N3-, the AlN-doped sample showed 35% increase in PL intensity and improvement of thermal stability. These fine particle size and better photoluminescence properties are expected to be applicable to industrial production of BaMgAl10O 17:Eu2+ phosphors. © 2013 Elsevier Ltd.

语种： 英文

作者： Wang, Yulin;Guan, Yuepeng;Yang, Yin;Yu, Peng*;Huang, Yaqin

期刊： Journal of Applied Polymer Science,2013年130(3):1498-1502 ISSN：0021-8995

通讯作者： Yu, Peng

作者机构： [Yang, Yin; Wang, Yulin; Huang, Yaqin] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Key Lab Carbon Fiber & Funct Polymers, Minist Educ, Beijing 100029, Peoples R China.;[Yu, Peng; Guan, Yuepeng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Yu, Peng] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： adsorption;biomaterials;catalysts;proteins

摘要： Gelatin (Gel) encapsulation onto activated carbon (AC) with catalase (CAT) was developed as an alternative method for CAT immobilization in this study. The immobilized CAT with AC encapsulated by Gel as the supporter accounted for 65.69% of the native enzyme activity. Furthermore, the properties of the immobilized CATs were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Among free CAT and the two immobilized CATs, the immobilized CAT with AC encapsulated by Gel as the supporter showed the highest relative enzymatic activity and a high stability in a broad range of pH values and temperatures, and its residual activity was 80% after 15 uses, whereas the immobilized CAT with AC as the supporter was retained at a level of only 50% under the same conditions. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1498–1502, 2013

语种： 英文

作者： Tan, Yu*;Lin, Zhiqun;Ren, Wenhui;Long, Woyun;Wang, Yong;...

期刊： Materials Letters,2012年89:240-242 ISSN：0167-577X

通讯作者： Tan, Yu

作者机构： [Lin, Zhiqun; Ouyang, Xicheng; Long, Woyun; Tan, Yu; Ren, Wenhui; Wang, Yong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Tan, Yu] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Methylene Blue;Microstructure;Photocatalytic activities;Photocatalytic property;Potential applications;SEM and TEM;Semiconductors;Solvothermal route;Solvothermal synthesis;Transmission electron microscopy tem;UV-vis diffuse reflectance spectra;UV-vis-DRS;Visible-light irradiation;Visible-light-driven

摘要： In this paper, three dimensional (3D) Cu 2SnS 3 architectures were successfully synthesized via a simple solvothermal route. The structure, morphology and optical properties of the as-prepared samples were characterized by using an X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectra (UV-vis DRS). The SEM and TEM image indicated that the flower Cu 2SnS 3 architectures consist of large number of uniform nanosheets. The band gap is about 2.42 eV, which have been confirmed by UV-vis DRS. Photocatalytic activities by photodegradation reaction of methylene blue (MB) were investigated under visible-light irradiation. The results indicate the potential applications of the Cu 2SnS 3 architectures in visible-light-driven photocatalysts. © 2012 Elsevier B.V. All rights reserved.

语种： 英文

作者： Wang YOUMING

期刊： Indian Journal of Mathematics,2012年54(1):1-17 ISSN：0019-5324

通讯作者： Wang, Y.

作者机构： [Wang YOUMING] Department of Applied Mathematics, College of Science, Hunan Agricultural University, Changsha 410 128, China

通讯机构： [Wang, Y.] D;Department of Applied Mathematics, , Changsha 410 128, China

关键词： Gu's criterion;Meromorphic function;Normality;Share value

摘要： In this paper we study the problem of normal families of meromorphic functions concerning shared values, which improves and generalizes Gu's normality and the related results of Fang and Chang, and Yang. et al. © 2012 Allahabad Mathematical Society.

语种： 英文

作者： Wang, Yong*;Tan, Yu;Liu, Biqiong;Liu, Bitao

期刊： Functional Materials Letters,2012年5(1):1250017 ISSN：1793-6047

通讯作者： Wang, Yong

作者机构： [Tan, Yu; Wang, Yong] Hunan Agr Univ, Dept Appl Phys, Changsha 410128, Hunan, Peoples R China.;[Liu, Biqiong] Hunan Agr Univ, Dept Grad Studies, Changsha 410128, Hunan, Peoples R China.;[Liu, Bitao] Lanzhou Univ, Dept Mat Sci, Lanzhou 730000, Peoples R China.

通讯机构： [Wang, Yong] H;Hunan Agr Univ, Dept Appl Phys, Changsha 410128, Hunan, Peoples R China.

关键词： Titanium dioxide;mesoporous material;dye-sensitized solar cells

摘要： Pure anatase TiO2 spheres with mesoporous structure were prepared by a simple urea assisted hydrothermal process at low temperature. X-ray Diffractometer, Scanning Electron Microscope, Transmission Electron Microscope, and N2 adsorption-desorption were used to characterize TiO2. The dye-sensitized solar cells results show that an overall light conversion efficiency of 6.96% which is 36.7% higher than that of the overall efficiency (5.09%) obtained from the P25 photoanode owing to the superior light scattering effect and the high level of dye loading capacity of microspheres.

语种： 英文

作者： 王勇

期刊： 安顺学院学报,2010年12(5):86-87 ISSN：1673-9507

作者机构： 湖南农业大学应用物理系,湖南,长沙,410126;[王勇] 湖南农业大学

关键词： 水热法;二氧化钛;纳米线;退火处理

摘要： 文章利用水热法成功制备二氧化钛纳米线,对制作样品进行不同温度的退火处理,利用X射线衍射仪（XRD）分析表征二氧化钛纳米线的成份与晶型,采用扫描电子显微镜（SEM）对TiO2纳米线的形貌进行了分析表征。

语种： 中文

作者： 王勇

期刊： 中国教育技术装备,2010年(24):140-141 ISSN：1671-489X

作者机构： 湖南农业大学应用物理系,长沙,410126;[王勇] 湖南农业大学

关键词： 二氧化钛;水热法;纳米线

摘要： 利用水热法制备二氧化钛纳米线,对样品进行退火处理,使用X射线衍射仪（XRD）和扫描电子显微镜（SEM）对二氧化钛纳米线的形貌、成分进行分析表征。

语种： 中文

作者： 王勇;汤剑锋;谭玉

期刊： 中国教育技术装备,2009年(6):105 ISSN：1671-489X

作者机构： 湖南农业大学理学院应用物理系,长沙,410126

关键词： 激光;迈克尔孙干涉法;线膨胀系数

摘要： 利用迈克尔孙激光干涉法测量固体的线膨胀系数,实验结果与理论值的相对偏差在5%以内。

语种： 中文

作者： 王勇

期刊： 读写算,2009年(6):115 ISSN：1002-7661

作者机构： 湖南农业大学理学院应用物理系

关键词： 大学物理;创造思维;发散思维;直观教学;直观思维

摘要： 培养学生的创造性思维是我国推行素质教育的主要要求，大学物理课程的性质决定了其教师要注重培养学生的创造思维能力。

语种： 中文

作者： 王勇;汤剑锋

期刊： 湖南文理学院学报(自然科学版),2009年21(03):48-49 ISSN：1672-6146

作者机构： 湖南农业大学,应用物理系,湖南,长沙,410128;[汤剑锋; 王勇] 湖南农业大学

关键词： 线膨胀系数;迈克尔逊;激光;干涉法

摘要： 给出了一种利用迈克尔逊激光干涉法测量铜棒线膨胀系数的实验设计及其操作方法.采用激光干涉法测量材料线膨胀系数和传统的顶杆法相比具有测量准确,测量分辨率高等优点,特别适合于对线膨胀系数较低的固体材料进行测量.

语种： 中文