声衰减机制 sound attenuation mechanisms
The discussion of attenuation mechanism of ultrasonic wave transimtion in rock is performed. The viscosity friction of mineral grain and microcrack surface, and the scatter effect of macrocrack, are considered an prevailing attenuation mechanism.
对声波在岩石中传播的衰减机制进行了讨论，认为矿物颗粒边界和微裂纹表面的粘滞性摩擦，以及宏观裂纹的散射效应是引起声波衰减的主要机制。
参考来源 - 基于超声波技术的岩体稳定性研究·2,447,543篇论文数据，部分数据来源于NoteExpress
而在高粘度极性溶剂中，分子内旋转损耗是主要的非辐射衰减机制。
Whereas in polar media with high viscosity, the internal rotation loss is the majorly nonradiative decay process.
本文对激光在大气中传输的各种能量衰减机制进行分析和讨论，为激光雷达系统的设计提供理论依据。
In this paper, the attenuation mechanisms of ladar signals propagating in the atmosphere are discussed and analyzed, and these give a theoretical basis of design of ladar system.
首先进行了一般回顾，然后对与频率有关的Q 值野外实测、Q 值的实验室测定及衰减机制等问题作了概述。
First of all, it gives a general review, then depicts the field measurements of Q values related to the frequency, laboratory measurements of Q values and the mechanism of attenuation etc.
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