In recent years, urbanization in China has stepped into an accelerating phase. Amidst magnificent achievements, there have emerged some complicated problems.
近年来，中国城市化进人加速阶段，取得了极大的成就，同时也出现了种种错综复杂的问题。
The analytical expressions for the phase and group velocities of the axial optical field, accelerating potential and energy gain etc. are derived and are used to make numerical analysis.
给出了轴上光场的相速度和群速度、加速电位及电子能量增益等的解析表达式，并作了数值计算和分析。
It is also found that the formation of reversed micelle in the organic phase could improve the extraction rate greatly and the extraction process exhibited obvious dynamic accelerating function.
萃取有机相中反向胶团的形成使萃取率极大提高，还具有明显的动力学加速作用，由此提出了“囊效应”传质理论和数据处理方法。
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