为了抑制抖振，同时采用一种PD型的控制结构限制系统的滑模态趋近速度。
To reduce the chattering, a PD-like control structure is employed which can slow the speed when the system runs to the sliding surface.
而突出煤样的瓦斯渗透速度增加率则随着瓦斯压力的增大而减小，最终趋近于一恒定值附近。
The increasing rate of the gas seepage velocity of outburst coal samples was decreasing with the increase of gas pressure and reaches to a constant value at last.
向心性肥厚组，心室形态趋向球形改变，室壁中间段与心尖段运动速度趋近于一致。
In concentric hypertrophy the ventricular geometry changed to be spheric, the velocities of the middle and apical segments tended to be equal.
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