桑基解释：“办法就是在四分之一的震动周期中施加脉冲，就像推小孩儿荡秋千一样，一个脉冲推动一次”。
"The idea is that the time that the pulse is on is about a quarter of a period of a vibration, " Sankey said.
但是如果我们只是单纯地把注意力放在商业周期上，那么货币供求的震动(包括对货币未来变化的期望)就是决定经济复苏速度的主导因素。
But if we are focusing purely on the business cycle, then shocks to the supply and demand for money (including expectations of future changes) are the primary determinant of the pace of recovery.
但是，在松软的土层上，长周期地震波的震动会被放大，可能使摩天大楼的摇摆更加剧烈。
But on soft soils, vibrations from long-period seismic waves are amplified, possibly exacerbating the swaying of skyscrapers.
这种震动以前被诟病为60年周期性日长变化的原因，但该研究发现的自转速度表明，它并不是罪魁祸首，英国利兹大学的乔恩芒德说。
The twisting had previously been blamed for a 60-year cycle in day length, but the rate of rotation found in this study suggests it is not the culprit, says Jon Mound at the University of Leeds, UK.
垫子在震动，它们以某一频率，进行震动，这意味着,存在某一震动周期。
Electrons are vibrating, and they are vibrating with a certain frequency, and that means there is a certain period of one oscillation.
竖向与水平向地震动分量卓越周期的比值在0.7 - 0.9之间，竖向设计反应谱的特征周期应有单独规定。
The ratio of vertical and horizontal predominant period is 0.7-0.9, so independent characteristic period of vertical design response spectrum should be defined.
为研究长周期地震动反应谱特性，本文首次采用了地震学研究所使用的宽频带数字地震记录作为数据基础。
In this paper, we use the digital broad-band records to study the characteristics of long-period ground motion.
若增加结构较短周期方向的设计强度，可在一定程度上降低双向地震动不利影响；
Increasing the design strength of structures in the direction with shorter period can reduce the negative effects of bi-directional ground motions on structural response.
研究结果表明：在简谐地面加速度作用下，高频地震动也可以引起长周期结构产生很大的位移反应，且最大位移反应出现在结构的瞬态自由振动阶段。
It is concluded that the transient response to a high frequency harmonic ground motion can increase greatly the displacement response of structures, particularly for the long period structures.
用丰富的高质量数字强震记录对台湾集集大地震及余震的长周期地震动特性进行了研究。
The study of long-period seismic wave is significant to the seismic design of the large-span engineering structures with long auto-oscillation period.
用丰富的高质量数字强震记录对台湾集集大地震及余震的长周期地震动特性进行了研究。
The study of long-period seismic wave is significant to the seismic design of the large-span engineering structures with long auto-oscillation period.
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