slow shear

The mixing process mainly involves the three following microscopic mechanism: fast convective mixing, slow diffusive mixing, and local shear mixing.

研究发现，床内物料混合过程大致可归纳为快速对流混合、缓慢扩散混合、局部剪切混合三种微观机理。

a linear transformation method to extract the onset of fast and slow shear waves is proposed in this paper.

提出了提取快、慢剪切波初动的线性变换方法。

Firstly, probing the medium with a time-harmonic homogeneous plane wave gives the Christoffel equation. Then the formulas for slowness and complex velocities of the longitudinal wave and the slow and quick shear waves may be obtained from Christoffel equation.

使用平面均匀简谐波的方法，得到了Christoffel方程，利用此方程推导出纵波及快、慢横波的慢度和复速度方程。

Based on gradient-dependent plasticity where an internal length parameter is included to consider the microstructural effect, the distributions of shear deformation, shear strain and temperature in adiabatic shear band were derived considering the slow and sharp decrease of load-carrying capacity beyond the peak shear stress.

采用梯度塑性理论，考虑了峰值剪切应力之后的材料承载能力缓慢降低的过程及承载能力快速降低的过程，推导了剪切带内部的剪切变形、应变及温度分布的公式。

The attenuation factor of longitudinal wave was changing linearly, whereas the attenuation factor of the slow shear wave kept nearly constant with a low frequency on the exploration seismic band.

纵波的衰减系数在地震频带内基本上呈线性变化，而横波的衰减系数在地震频带内除低频外基本保持稳定。