variation center

Zhengzhou city and Kaifeng city were respectively studied from extended time course of the center city construction land, spatial variation characteristics and structural analysis.

从中心城市建设用地扩展的时间过程、空间变化特征和结构分析三方面分别对郑州、开封两市进行了研究。

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Arabian Sea and the eastern tropical Indian Ocean have larger seasonal variation of sea temperature than the others. Because these two sea area are the marine information area of tropical Indian Ocean, and both of them locate in the strong center of air-sea interaction.

阿拉伯海和热带东印度洋的海温季节变化比其他的海区的大，原因是这两个海区是热带印度洋海气相互作用的强中心。

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The center main spring centrifugal variation paddle device for wind energy conversion system

风力机中央主弹簧离心变桨装置

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Using sea ice concentration dataset covering the period 1968-2002 obtained from the Hadley Center of UK, the temporal series of representative characteristic regions concerning sea ice variation in Antarctica are found and the characters of Antarctic sea ice variations are presented.

本文依据Hadley中心提供的1968.1～2002.12全球海冰密集度格点资料，利用诊断分析方法，建立了有代表性的南极海冰特征区域的时间变化序列，并分析了各区域海冰变化特征。

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Based on analysis, variation laws of the bulkhead perforation, the large center hole in tank and the range of penetration pit according to speed changes are summarized.

在分析的基础上，总结了舱壁的穿孔、贮箱的大中心孔和侵彻成坑范围等损伤特性随弹速变化的规律。

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