An instrument for measuring ultrasonic attenuation by means of comparing the ultrasonic pulse echo with a calibrated exponential decay wave-form is described.

本装置用超声脉冲回波与定标指数波形比较的方法测量超声衰减。

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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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The exponent decay of solution of wave equation with boundary memory is obtained by the energy method.

本文利用能量扰动法得到具边界记忆项波动方程初边值问题解的指数衰减性。

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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'