多数自然灾害不会对经济周期产生重大影响。
MOST natural disasters do not have a major impact on the business cycle.
她像濮德培一样用衰退分析来衡量一定时期、周期性的和自然灾害的有关价格影响。
Like Perdue, she USES regression analysis to try to measure the relative impact on prices of the passage of time, seasonality, and natural catastrophes.
基于自组织临界性的理论框架，针对处于周期区与混沌区之间状态的灾害系统，研究其可预测性及预测方法。
Some disaster systems are in a state between cycle region and chaos region. Their predictability and prediction technique are researched based on self-organized critical theory.
所用的预测方法是倍周期性、静中动判据和地球物理灾害链。
The predicting methods used are multiplied periodicity, criterion of activity in quiescence and the geophysical disaster chain.
文中分析了直接顶引起周期压力的原因和条件，提出了预防直接顶周期性压力灾害的措施。
The paper analyzes the reasons and preconditions of this periodical pressure, then preventive measures of hazards caused by immediate roof periodical pressure is suggested.
本区灾害具有强度大、突发性强、分布广、区域性强，以及同步迭加交替出现和周期性特点。
In the region, disasters have characteristics: strong intensity and suddenness, wide dispersal, strong localization, appearing simultaneously and alternatively and periodicity.
前言：工业化以来，传统灾害的持续和演化明显表现出七大趋势：灾害发生越来越频繁，周期越来越短；
Since Industrialization, the evolution trends of traditional calamities have showed seven trends: higher frequency and shorter periodicity;
前言：工业化以来，传统灾害的持续和演化明显表现出七大趋势：灾害发生越来越频繁，周期越来越短；
Since Industrialization, the evolution trends of traditional calamities have showed seven trends: higher frequency and shorter periodicity;
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