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THE ELECTROCHEMICAL PERFORMANCES OF Zr-BASED HYDROGEN STORAGE ALLOYS

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中国有色金属学会会刊：英文版 1995年第3期5卷 61-65页

作者： Yang, Xiaoguang Lei, Yongquan Wu, Jing wang, qidong(department of materials science and engineering, zhejiang university, hangzhou 310027) zhejiang Univ Hangzhou China

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关键词： Zr-based Laves phase crystal structure electrode performances

MECHANISM OF DEUTERIUM CRACKING IN PALLADIUM

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Acta Metallurgica Sinica(English Letters) 1993年第2期6卷 136-139页

作者： SUN Dalin LEI Yongquan CHEN Yanglin WU Jing wang qidong zhejiang university,hangzhou,china department of materials science and engineering,zhejiang university,hangzhou 310027,china zhejiang Univ Hangzhou China

After 290 h electrochemical charging of deuterium,the density of dislocation in well-annealed Pd was increased from 10~8/cm^2 to over 10~12/cm^2 and a large amount of bubble-like voids or cracks was observed by optical and transmission electron *** mechanism of deuterium cracking is believed due to the formation of molecular De during the segregstion and combination of deuterium atoms around *** results showed that the lattice constant of Pd increased from 0.3890 nm to 0.4034 nm.

关键词： deuterium cracking Pd

Hydrogen Storage Properties of Ti_(1.2)Fe+xCa Hydrogen Storage Alloys

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Rare Metals 2001年第4期20卷 265-269页

作者： Wei wang, Changpin Chen, Haiou Xu, Hon gbo Li, qidong wang department Materiak science and engineering, zhejiang university, Hangvhou 310027. china zhejiang Univ Dept Mat Sci & Engn Hangzhou 310027 Peoples R China

The hydrogen storage properties of Ti1.2Fe+xCa (x=1%, 3% and 5% in mass fraction) alloys was investigated. Results stow that the modified alloys can be activated without any thermal treatment at room temperature due to the addition of Ca and excess Ti in (lie alloys. Hydrogen storage properties of these modified alloys vary with Ca amount and reaction temperature. In addition, the influence mechanism of the addition of Ca and excessive Ti on the activation behavior and hydrogen storage capacity of the alloys was discussed.

关键词： TiFe Ca hydrogen storage alloy hydrogen storage property

Dynamic behavior of polymer surface and the time dependence of contact angle

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science china Chemistry 2005年第6期48卷 553-559页

作者： wang Xinping1, CHEN Zhifang1 & SHEN Zhiquan2 1. Key Laboratory of Advanced Textile materials and Manufacturing Technology of Education Ministry, department of Applied Chemistry, zhejiang Institute of science and Technology, hangzhou 310033, china 2. department of Polymer science and engineering, zhejiang university, hangzhou 310027, china 1. department of Applied Chemistry Zhejiang Institute of Science and Technology Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Education Ministry 310033 Hangzhou China 2. department of Polymer science and engineering Zhejiang University 310027 Hangzhou China

Time-dependent contact angles were measured by depositing sessile drops of wa-ter on the polymer surfaces and monitoring the drop shape as a function of time. It was found that contact angles decreased sharply with contact time and the equilibrium contact angle was finally attained after a certain time. Values of starting (θ s) and equilibrium contact angles (θ e) obtained by the sessile drop method depend on polymer properties. The Wilhelmy plate technique was used to measure advancing and receding contact angles. The variations of starting (θ s) and equilibrium contact angles (θ e), advancing (θ a) and receding contact angles (θ r) have been studied on the oxidized surface of polymers containing polybutadiene block to explore the cause of time-dependence in contact angle measurement and the meaning of θ s and θ e. The results showed the linear relationships between starting (θ s) and advancing contact angles (θ a), the equilibrium (θ e) and receding contact angles (θ r). The similar relationship was also established between the contact angle hysteresis (θ a?θ r) and differences (θ s ?θ e) in starting contact angles and equilibrium contact angles. Therefore, time-dependence in contact angle measurement was mainly attributed to the surface reconstruction when water drops were deposited on polymer surfaces. The starting contact angle was contributed by the hydrophobic component on polymer surface and the equilibrium contact angle mainly by the hydrophilic component of polymer. These results not only demonstrated the interdependency between two contact angle measurements, the sessile drop method and the Wilhelmy plate technique, but also provided the experimental evidence to explain the cause of time-dependent contact angle. This may also provide a new method to study dynamic behavior of polymer surface.

关键词： contact angle, surface dynamic behavior, polymer surface, dynamic contact angle, time-dependence.

Constructing a quasi-Legendre basis based on the C-Bézier basis

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Progress in Natural science:materials International 2005年第6期15卷 559-563页

作者： HUANG Yu* and wang Guozhao(department of Mathematics, zhejiang university, hangzhou 310027, china) department of Mathematics Zhejiang University Hangzhou 310027 China

In the space Γ_n=span｛sint,cost,1,t,t2,…,t n-2 ｝, a C-Bézier basis is constructed by an integral approach. However, the C-Bézier basis is not orthogonal. For some applications, we construct an orthogonal basis based on the C-Bézier basis, which has remarkable properties similar to that of the Legendre basis. Then we derive the transformation matrices that convert the C-Bézier basis and the orthogonal basis into each other. As an example of application, we apply this orthogonal basis to the degree reduction approximation of the C-Bézier curves.

关键词： C-Bézier basis orthogonal basis basis transformations degree reduction.

Physically based simulation of Buddha Glory

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Progress in Natural science:materials International 2006年第6期16卷 656-662页

作者： LIU Shiguang, wang Zhangye, GONG Zheng, wang Changbo and PENG Qunsheng (State Key Laboratory of CAD&CG, zhejiang university, hangzhou 310027, china department of Mathematics, zhejiang university, hangzhou 310027, china department of Structure engineering, Tongji university, Shanghai 200092, china) [a]State Key Laboratory of CAD&CG Zhejiang University Hangzhou China [b]department of Mathematics Zhejiang University Hangzhou China [c]department of Structure engineering Tongji University Shanghai China

This paper proposes a novel method of photorealistic simulation of Buddha Glory, a natural phenomenon of great visual beauty which can be observed in the area of famous Buddhism Holy Lands in china. This phenomenon is mainly caused by back-scattering of water droplets in fog or cloud. To simulate the glory, we first calculate the spectral scatter intensity of glory rings using Mie scattering theory. We then present a new shadow model to determine the deformed shape of the head and body of "Buddha" within the glory ring. The affect of atmospheric parameters such as the solar elevation angles, the density and size of water droplet in fog or cloud on the shape and color of Buddha Glory is also calculated. For rendering, we adopt the method of path scattering integral to generate the whole attenuated scene of Buddha Glory. Compared with the photographs of real Buddha Glory displays, our synthetic results are quite satisfactory.

关键词： natural phenomenon Buddha Glory back-scattering physically based simulation.

CRYSTAL STRUCTURE AND ELECTROCHEMICAL PROPERTIES OF Zr(Mn_(1-x)Ni_x)_2(0.40≤x≤0.75) HYDROGEN STORAGE ALLOYS

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Acta Metallurgica Sinica(English Letters) 2001年第1期14卷 56-62页

作者： W.K. Zhang, C.A. Ma, X.G. Yang, H. Huang, Y.Q. Lei and Q.D. wang (department of Applied Chemistry, zhejiang university of Technology, hangzhou 310014, china department of materials science and engineering, zhejiang university, hangzhou 310027, china) Dept. of Appl. Chem. Zhejiang Univ. of Technol. Hangzhou 310014 China

The crystal structure, phase abundance and the electrochemical properties of Zr(Mn1-x Nix)2 (0.40 ≤x≤0.75) alloys were investigated by means of XRD, Rietveld refinement method and electrochemical measurements. The alloys are multiphase. C15 Laves phase occurs as a main phase accompanying with C14 phase and other minor phases, indicating that Ni element is C15-stabilized element for ZrMn2 alloy. The phase abundance and lattice parameters of Laves phase are influenced significantly by Ni substitution. The Zr(Mn0.45 Ni0.55)2 alloy with the highest amount of C15 phase exhibits the maximum electrochemical capacity of 242m Ah/g. C14 phase occurring in Zr-Mn-Ni alloys is beneficial for the electrochemical kinetics of hydride electrodes.

关键词： hydrogen storage alloy crystal structure phase abundance,elec- trochemical property

Shape blending of artistic brushstroke represented by disk B-spline curves

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Progress in Natural science:materials International 2007年第12期17卷 1501-1507页

作者： Cheng Min1,2 and wang Guojin1(1. department of Mathematics, zhejiang university, hangzhou 310027, china 2. department of Mathematics, zhejiang university of Technology, hangzhou 310032, china) department of Mathematics Zhejiang University Hangzhou 310027 China 2. department of Mathematics Zhejiang University of Technology Hangzhou 310032 China

This paper presents an algorithm for automatically generating in-between frames of two artistic brushstrokes. The basic idea of the algorithm is to represent the two key frames of artistic brushstrokes in disk B-spline curves, and then make blending of their geometric intrinsic variables. Given two key frames of artistic brushstrokes, the skeleton curves can be obtained by certain skeleton-based techniques. After disk B-spline representation of the key frames is generated, interpolation of the intrinsic variables of the initial and the target disk B-spline curves is carried out. Examples show that this method can efficiently create in-between frames of artistic brushstrokes.

关键词： computer aided calligraphy shape blending brushstroke disk B-spline curve skeleton.

The structure of uniform B-spline curves with parameters

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Progress in Natural science:materials International 2008年第3期18卷 303-308页

作者： Juan Cao , Guozhao wang Institute of Image Processing and Computer Graphic, department of Mathematics, zhejiang university, hangzhou 310027, china Institute of Image Processing and Computer Graphic Department of Mathematics Zhejiang University Hangzhou 310027 China

The shape-adjustable curve constructed by uniform B-spline basis function with parameter is an extension of uniform B-spline curve. In this paper, we study the relation between the uniform B-spline basis functions with parameter and the B-spline basis functions. Based on the degree elevation of B-spline, we extend the uniform B-spline basis functions with parameter to ones with multiple parameters. Examples show that the proposed basis functions provide more flexibility for curve design.

关键词： Uniform B-spline Shape parameter Shape-adjustable curve Degree elevation