本文从衍射积分公式出发，利用贝塞尔函数，求得夫琅禾费环孔衍射积分的精确解，并对衍射图样进行分析讨论。

In this paper, diffraction integral equations and Bessel Functions are used to getting perfect solution of Fraunhofer ring aperture diffraction, and the diffraction pattern is analysed.

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从衍射积分公式出发，利用贝塞尔函数，求得夫琅禾费环孔衍射积分的精确解，并对衍射图样进行了分析。

Diffracton integral equations and Bessel Functions are used to get perfect solution of Fraunhofer ring aperture diffraction, and the diffraction pattern is analysed.

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库存费的变化率为存贮量的函数，讨论模型解的存在性和唯一性，找到了最优存贮策略。

The existence and uniqueness of the models are discussed, and optimal inventory policies are found.

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库存费的变化率为存贮量的函数，讨论模型解的存在性和唯一性，找到了最优存贮策略。

The existence and uniqueness of the models are discussed, and optimal inventory policies are found.

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