Variation function, which is the core and a basic tool of geostatistics, can describe not only the spatial structure change, but also the randomicity change of the regional variable.
变异函数是地质统计学的核心内容和基本工具，它既能描述区域化变量的空间结构性变化，又能描述其随机性变化。
The idea and basic problem in variable structure control, differential geometry method on feedback linearization , inverse system method, direct feedback linearization method are mainly described.
主要介绍了变结构控制、反馈线性化的微分几何方法、逆系统方法、直接反馈线性化等方法的基本思想和基本问题。
This paper introduces the basic principle of dual-mode rotary field mutil-function variable polarizer and analyzes the detail of its structure, design and performance.
介绍了双模转场多功能变极化器的基本原理，分析了它的结构、设计和特性，并给出了设计和实验的结论。
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