Discrete element method is used to analyze the roof stability in accordance with the variation of its loading, rock frictional Angle, bolt spacing, rock properties and bolt orientation.
采用离散单元法，分析了当荷载、岩体的摩擦角、锚杆间距、锚杆方向和岩体的性质变化时，顶板的稳定性。
As one of the branches of statistics, time series analysis focuses on the variation characters and trend of discrete ordered data series mainly.
时间序列分析是统计学的分支之一，它的研究对象是离散有序数列的变化特征和变化趋势。
Start-up process is a kind of complicated dynamic variation system, which exists not only continuous dynamic variables but also gone with discrete logic variables.
化工开停车过程是既有连续动态变量，又有离散逻辑变量的复杂动态变化系统，混杂现象普遍存在于流程生产工业中，目前对其进行的研究刚刚起步。
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