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學術出版;;Publications

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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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1993 - 19942

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🏛️國立陽明交通大學機構典藏

Access type: Metadata onlyAuthor: search.filters.author.WEI, JG

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    OPTICAL-PATTERN SIMULATIONS FOR CLOSED CYLINDERS OF LIQUID-CRYSTALS
    (1993-05-01)
    LIANG, BJ
    ;
    WEI, JG
    ;
    CHEN, SH
    ;
    光電工程學系
    ;
    Department of Photonics
    Optical patterns for the polarizing microscope textures of closed cylinders of liquid crystals (CCLCs) are studied by the Jones vector formulation. The simulated director configuration diagram of a CCLC with normal orientation at the walls contains four kinds of stable director configurations. The resulting texture under some approximations depends only on phase shifts. The patterns are characterized by dark brushes that coincide with the directions of the crossed polarizers. Additionally, there are concentric circle fringes. For the ring defect structure, the centre region of the cylinder exhibits a black extinction. However, this is not distinguishable as between the hyperbolic and radial structures for both the point and the ring defect patterns. Comparing the observed patterns with the simulated ones, we find that the dark cross brushes and the centre black extinction of simulated patterns are similar to those that are observed. However, the concentric circle fringes of the observed pattern are not in accordance with the simulated pattern.
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    CONFIGURATION TRANSITION OF A CLOSED-CYLINDER NEMATIC LIQUID-CRYSTAL IN AN EXTERNAL ELECTRIC-FIELD
    (1994-03-15)
    CHEN, SH
    ;
    WEI, JG
    ;
    交大名義發表
    ;
    光電工程學系
    ;
    National Chiao Tung University
    This study reports on the director-field configurations of a closed-cylinder nematic liquid crystal with negative dielectric anisotropy in an external electric field. Raising the applied voltage causes the director orientation with a volume point defect to be transformed from a normal to a twisted configuration. The voltage at which the configuration is transformed depends on the aspect ratio of the cylinder.