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1.55 μm Wavelength Operation of E_r^(3.) -Doped Optical Fiber Bistability

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wuhan university Journal of Natural Sciences 1999年第4期4卷 435-438页

作者： SONG Qian 1, ZHANG Yuan cheng 2 1. college of Electronics Information, wuhan university, wuhan 430072. china 2. Department of {3., wuhan university, wuhan 430072. china wuhan university College of Electronics Information Wuhan China (GRID:grid.49470.3e) (ISNI:***) wuhan university Department of Physics Wuhan China (GRID:grid.49470.3e) (ISNI:***)

An all optical all fiber optical bistability operation has been realized in an all fiber cavity consisted with Er doped fiber and optical fiber loop mirrors. The experimental bistability threshold is consistent w... 详细信息

关键词： optical nonlinearity optical bistability Er doped fiber all fiber device

COLLECTIVELY COMPACT COMPOSITION OPERATOR SEQUENCES BETWEEN BERGMAN AND HARDY SPACES

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Acta Mathematica Scientia 2004年第2期24卷 206-212页

作者：王茂发刘培德 SchoolofMathematicsandStatistics WuhanUniversityWuhan430072China

This paper studies the collective compactness of composition operator sequences between the Bergman and Hardy spaces. Some sufficient and necessary conditions involving the generalized Nevanlinna counting functions fo... 详细信息

关键词： Bergman space Hardy space composition operator collectively compact operator sequence

Algorithm of graph isomorphism with threedimensional DNA graph structures

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Progress in Natural Science:Materials International 2005年第2期15卷 86-89页

作者： LIU Guangwu 1,2*, YIN Zhixiang 1,3. XU Jin1 and DONG Yafei1(1. Department of Control Science and Engineering, Hua Zhong university of Science and technology, wuhan 43.074, {3. 2. college of Transportation, wuhan university of technology, wuhan 43.063. {3. 3. Department of Mathematics and physics, Anhui university of Science and technology, Huainan 23.001, {3.) Department of Control Science and Engineering Hua Zhong University of Science and Technology Wuhan 430074 China. college of Transportation Wuhan University of Technology Wuhan 430063 China. Department of Mathematics and physics Anhui University of Science and Technology Huainan 232001 China

An algorithm for solving the graph isomorphism problem with 3.D DNA structures is proposed in this paper. The k-armed branched junction molecules are used to code k-degree vertices. Double stranded molecules are used to code edges. Then the molecules are mixed in a tube to be ligated. The result can be detected by gel electrophoresis. The time complexity of the algorithm is O(n2), where n is the number of vertices of the graph.

关键词： DNA computing DNA graph structure graph isomorphism

Cell Evolutionary Algorithm: a New Optimization Method on Ground-State Energy of the Atomic

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wuhan university Journal of Natural Sciences 2000年第4期5卷 425-430页

作者： Liu Lian-jun, Xu Jing-wen, Mao You-dong, Li Yuan-xiang Department of physics, wuhan university, wuhan {3.china State Key Laboratory of Software Engineering,wuhan university, wuhan 430072. china Department of physics Wuhan University Wuhan China State Key Laboratory of Software Engineering Wuhan University Wuhan China

The purpose of this paper is to present a new general approach to solve ground-state energies of the double-electron systems in a uniform magnetic field, in which the basic element of evolution is the set in the solution space, rather than the point. The paper defines the Cell Evolutionary Algorithm, which implements such a view of the evolution mechanism. First, the optimal set in which the optimal solution may be obtained. Then this approach applies the embedded search method to get the optimal solution. We tested this approach on the atomic structure, and the results show that it can improve not only the efficiency but also the accuracy of the calculations as it relates to this specific problem.

关键词： Key words double electron systems ground state energy variational principle cell evolutionary algorithm evolutionary algorithm

Electronic Structure of Doped Trans-Polyacetylene

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wuhan university Journal of Natural Sciences 2002年第1期7卷 51-53页

作者： Ren Da-zhi 1,2, Zhuang Wei 2, Wang Jun 2 1. wuhan university Journals Press,wuhan 430072.Hubei,{3. 2. School of physics and technology, wuhan university, wuhan 430072.Hubei,{3. wuhan university Journals Press Wuhan Hubei China School of physics and technology Wuhan University Wuhan Hubei China

The behavior of electronic structures of doped trans-polyacetylene is revealed by a simple method. (C24H26)+n is used to simulate p-type doped trans-polyacetylene at various doping concentrations. The electronic structure is calculated, by CNDO/2 method. These calculations show that at low doping level, the decrease of electronic energy compensates the increase of elastic energy, thus the bond alternation exists, and the charge carriers are solitons. When doping level is high, the increase of elastic energy is larger than the decrease, of electronic energy, the bond alternation disappears, solitons no longer exist, and polyacetylene is in a metalic state.

关键词： trans polyacetylene CNDO/2 electronic structure doped

STUDY ON THE MISCIBILITY OF DYNAMICALLY VULCANIZED EPDM/PP BLEND BY POSITRON ANNIHILATION SPECTROSCOPY

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Chinese Journal of Polymer Science 2000年第2期18卷 123-128页

作者： Tao Jiang Xue-liang Jiang Shi-yuan Cheng Yi-qun Dai Shao-jie Wang Bo Wang Faculty of Chemistry & Material, Hubei university, wuhan 43.062, china Department of {3., wuhan university, wuhan 430072. china 湖北大学湖北武汉武汉大学湖北武汉

Positron annihilation spectroscopy (PAS) was utilized to investigate the relationship between the free-volume hole properties and miscibility of dynamically vulcanized EPDM/PP blend. The results showed that the noncrystalline region of PP and EPDM in the blend was partially miscible and the miscibility of the blend became worse when the weight percent of EPDM was <50%. This was also demonstrated by DMTA and mechanical properties of the blends with various compositions.

关键词： EPDM PP dynamic vulcanization miscibility PAS

Preparation and Characterization of Chitosan/Carboxymethylated Konjac Glucomannan Blend Films

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wuhan university Journal of Natural Sciences 2002年第1期7卷 107-112页

作者： Zheng Hua 1 , Du Yu-min 2 1. Department of Chemical Engineering, wuhan university of technology, wuhan 43.070, Hubei, {3. 2. college of Chemistry and Molecular Sciences, wuhan university, wuhan 430072. Hubei, {3. Department of Chemical Engineering Wuhan University of Technology Wuhan Hubei China college of Chemistry and Molecular Sciences Wuhan University Wuhan Hubei China

In order to improve the mechanical and water swelling properties of the chitosan (CS) film, a series of transparent films were prepared by blending 2%(weight) chitosan acetic acid solution with 1.5%(weight) carboxymethylated konjac glucomannan (CMKGM) aqueous solution according to predetermined ratio and drying at 3.°C. The morphological structure, miscibility, thermal stability, mechanical properies, and swelling capacity of the blend films were studied by infrared (IR), X-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron micrograph (SEM), and measurements of the mechanical properties and swelling properties. The results demonstrated that there was strong interaction and good miscibility between CS and CMKGM resulted from intermolecular hydrogen bonding and electrostatic force. The mechanical properties in dry state and wet state, thermostability, and water swelling properties of the blend films were obviously improved. The best values of the tensile strength in the dry and wet state achieved 89 MPa and 49 MPa, respectively, when the CMKGM content was 3.%(weight). The CS/ CMKGM blend films provided promising biomedical applications.

关键词： Key words chitosan carboxymethylated konjac glucomannan blend films structure characterization

Behavior of gravity waves with limited amplitude in the vicinity of critical layer

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Chinese Science Bulletin 2002年第18期47卷 1547-1550页

作者： WU Shaoping & Yl Fanwuhan Institute of physics and Mathematics, Chinese Academy of Sciences, wuhan 43.071, {3. Department of Radio Science and technology, wuhan university, wuhan 430072. china Department of physics, Huazhong Normal Univ wuhan Institute of physics and Mathematics Chinese Academy of Sciences Wuhan China Department of physics Huazhong Normal University Wuhan China Department of Radio Science and technology Wuhan University Wuhan China

By using the FICE scheme, a numerical simulation of three-dimensional nonlinear propagation of gravity wave packet in a wind-stratified atmosphere is presented. The whole nonlinear propagation process of the gravity wave packet is shown; the propagation behavior of gravity waves in the vicinity of critical layer is analyzed. The results show that gravity waves encounter the critical layer when propagating in the fair winds whose velocities increase with height, and the height of critical layer propagating nonlinearly is lower than that expected by the linear gravity waves theory; the amplitudes of gravity waves increase with height as a whole before gravity waves encounter the critical layer, but the increasing extent is smaller than the result given by the linear theory of gravity waves, while the amplitudes of gravity waves reduce when gravity waves meet the critical layer; the energy of wave decreases with height, especially at the critical layer; the vertical wavelength reduces with the height

关键词： gravity waves critical layer FICE scheme simulation.

Dimensions of modified Besicovitch-Eggleston sets

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Science china Mathematics 2006年第2期49卷 245-254页

作者： XIE Yuqiong & WEN Zhixiong Department of Mathematics, wuhan university of technology, wuhan 43.070, {3. School of Mathematics and Statistics, wuhan university, wuhan 430072. china Department of Mathematics Wuhan University of Technology Wuhan China School of Mathematics and Statistics Wuhan University Wuhan China

We consider the variants of Besicovitch-Eggleston sets in symbolic spaces, and determine their fractal dimensions.

关键词： Besicovitch-Eggleston set fractal dimension symbolic space multifractal.