The existence and overlapping phenomena of spatial expanding components have been discovered and investigated in designing diffractive optical elements.
发现并研究了衍射光学器件优化设计中空间延拓分量的存在及其交叠现象。
The spatial expanding intensity of road and factory and industry are higher, that of greenbelt and others is decreasing so that it becomes negative increasing.
武汉市道路工厂用地及工业用地的年均空间扩展强度较高，而绿地及其它用地呈下降以至于负增长趋势。
With the expanding of GIS application, multi-user concurrent operation becomes the basic demand for spatial data engine.
随着GIS应用的扩大，多用户并发操作成为空间数据引擎的基本要求。
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