This paper analyses the sound decay in an acoustically treated rectangular space from the view point of wave acoustics. and a new method of calculating complex eigenvalue is given.

本文从波动声学观点出发，分析了矩形水池中声能的衰变，给出了一种解算复本征值的新方法。

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The blasting vibration of creep mass slope of Longtan hydropower station is observed, interpreted and analyzed. The experiential formula of decay for the blasting earthquake wave is obtained.

对龙滩水电站蠕变体边坡的爆破振动进行观测、分析和处理，得到了爆破地震波衰减经验公式。

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By using the perturbed-energy method, the exponential decay of the solution is obtained for the nonlinear wave equations with time-dependent coefficients and dissipative boundary condition.

利用能量法证明了具耗散边界条件和时间依赖系数的非线性波方程的能量指数衰减性。

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Spalted wood is wood that has been infiltrated by "waves" of decay, with each wave leaving a uniquely outlined stain-zone line.

NPR: Excerpt: 'A Splintered History Of Wood'