The article presents virtual scene building technology based on wavelet transform, and implements a real-time roaming system for cylinder, cubic and sphere panorama.

文章介绍了基于小波变换的虚拟场景构造技术，并实现了一个对柱面全景图、立方体全景图和球面全景图的实时漫游系统。

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This paper discuss the locally topological structure of higher order singular point for the plane cubic system in the first critical case and give a criterion by the coefficients of polynomials.

讨论了第一临界情形下的平面三次系统高次奇点的局部拓朴结构，并给出利用多项式系数的判断准则。

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A class of cubic differential system is studied in this paper, in which origin is nilpotent singular point.

研究了一类原点为三次幂零奇点的三次微分系统。

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That year a new manager took over and instituted a tiered system of payment: If your household consumption was not more than 7.5 cubic meters per month (this would take care of water required for drinking, cooking and some hygienic needs of an average family of eight), you paid a subsidized rate, but if your monthly consumption was more, you paid a market rate.

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