两能级原子与外部环境(热库)相互作用时，采用非旋波近似，研究原子与热辐射场单光子和双光子作用过程。
The interaction of a two-level atom with a thermal radiation field for single-photon processes and two-photon processes without rotating wave approximation is analysed.
基于非结构动态嵌套网格，将聚合多重网格方法引入到旋翼的前飞流场计算中。
An agglomeration multigrid method was applied to numerical calculation of rotor forward flight flow based upon the unstructured dynamic overset grids.
旋翼的流场呈现很强的非定常现象。
The flow field of the helicopter rotor is characterized by unsteady phenomena.
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