Then making use of the advantages of concept lattice of concept retrieval and visualization, this paper proposes a method of query expansion in search engine based concept lattice.

接着利用概念格对概念检索的可视化特点，创造性地提出基于概念格的搜索引擎查询扩展方法，最后实现了基于概念格的查询扩展实验平台。

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Plane wave expansion techniques and transfer matrix method are used to study the two-dimensional photonic crystal with a triangular lattice of dielectric cylinders in air.

提出了用正、负折射率介质层交替排列构成的一维光子晶体模型，并且用传输矩阵法计算了该模型的透射谱，从理论上分析了其带隙结构。

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