This paper described the primary analysis of a new model helicopter ground resonance in taking off and landing by employed classical spatial dynamic model.
对某新型直升机垂直起落状态“地面共振”初步分析，采用经典的空间动力模型进行计算。
Through analysis of classical DPC, a new switch table can be deduced which promote the efficiency of reactive power control of PWM rectifier.
通过对传统直接功率控制的分析，推导出一个新的开关表，可以显著地改进PWM整流器的无功功率控制性能。
Random fractal, which involves probability, classical analysis and geometry, is a new mathematics branch.
随机分形是融概率论、经典分析和几何学于一体的新兴数学分支。
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