空窖内的平衡辐射可看作光子气体，本文使用玻色分布，推导出了光子气体的碰壁数表达式。为了显示此碰壁数表达式的应用价值，还使用它导出了斯特藩一玻尔兹曼定律，这是与教材中斯特藩一玻尔兹曼定律推导方法不同的另一简单方法。%This paper discusses characteristic vibrating properties for a symmetric rod and/or beam in which the geometric and the physical parameters are symmetric distribute about midpoint of the structure. It is pointed out that a symmetric rod and/or beam can be resolved into two half a structures with different supported form in this paper. These results are foundation raised and solved inverse vibration problems for the symmetric structures.
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