Single wavelength collimation transmittance experiment is designed and conducted, with total effective attenuation coefficient of tissue phantoms being obtained.
设计单波长准直光透射实验并通过实验测量组织模拟样品的总衰减系数；
Two of the most predominant characteristics of Surface Wave are Dispersion and Attenuation which are the effective tools to study the velocity structure and viscidity structure of the earth interior.
频敌和衰减是面波传播中的两个基本特征，利用面波频散和衰减可以有效地研究地球内部速度结构和粘弹性结构。
Under the circumstance of seismic long wavelength, the circular dry fracture is more effective in attenuation of elastic wave than thin dry fracture when the characteristic scale is same.
在地震长波长情况下，相同特征尺度的圆形干裂纹比薄的干裂纹对弹性波衰减更有效。
An exploration of axle centre pressure attenuation rule proves that the effective injection distance is 9~15 times as much as the diameter of nozzle entry.
对轴心压力衰减规律的探索，证明其有效喷距为喷嘴入口直径的9～15倍；
The attenuation function of the isolation trench to the shock vibration is more effective with increase in the intensity of the blast loading.
隔振沟对振动加速度的衰减作用随载荷强度的增加而增强。
The technique of active attenuation of noise is very effective for controlling the low frequency noise in ducts.
有源消声技术对于管道中低频噪声的控制非常有效。
The technique of active attenuation of noise is very effective for controlling the low frequency noise in ducts.
有源消声技术对于管道中低频噪声的控制非常有效。
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