哈普古德这个理论主要是这样的：在合适的时候，地球大陆会“滑动”，地轴会偏移好几度。
Basically, Charles Hapgood had this idea that if the conditions were right, all of the world's continents could 'slip', displacing the axis by many degrees.
它的理论基础是滑动最小二乘法。
利用可变阻尼器对连续梁桥的竖向振动进行半主动控制，提出基于滑动模式理论的控制算法，并以实例加以说明。
This paper is concerned with semi-active control of vertical vibration for continuous beam by variable dampers and puts forward the semi-active control law based on the sliding mode theory.
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