A new analytical expression of heterogeneous spatial precipitation is given which are the lorenz curve and the coefficient of gini . we can express the degree of heterogeneous about the spatial distribution of precipitation by use of this method , and we can declare whether it is possible have the fond or not 文章引进了一种新的描述非均匀性的方法:洛仑兹( lorenz )曲线和基尼系数,利用它们可以更加准确的表示出降水量场空间分布的非均匀程度,并能据此判定有无洪涝灾害形成可能。
As groundwork of controlling chaos system , it is first time to offer controllability and observability of chaotic system utilizing difference geometry theory , taking typical lorenz chaos as example . the conclusion on lorenz system is given , and the research method of other chaotic systems are provided at the same time . a kind of synchronization technique is presented based on variable structure system ( vss ) control theory and above conclusion in the dissertation 作为混沌系统控制的基础,以典型混沌系统lorenz系统为例,首次利用非线性系统几何理论对混沌系统进行了能控性和能观性分析,在给出对lorenz系统分析结果的同时,也为实现混沌系统的同步控制提供了理论方法本文提出了一种利用变结构控制方法实现混沌同步的方法。