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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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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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'