The evolution of coherent structures in a 2-D time-developing mixing layer of the Oldroyd-B fluids are examined numerically.
混合层是一种在化工过程中经常见到的基本流场，对该流场拟序结构的研究具有理论和实际意义。
The compact 4-component 2-D finite-difference frequency-domain algorithm (2-D CFDFD) is one of the effective methods to calculate the propagation properties of ideal guided wave structures.
四分量紧凑格式二维频域有限差分（2-D CFDFD）算法，是求解理想导波结构传输特性的有效方法之一。
Results 2-d and color Doppler ultrasound reflected SSOL structures and blood supply status clearly. The detective rate of SSOL on ultrasound was very high.
结果二维和彩色多普勒超声可以显示脾脏占位性病变的结构特征及血供状态，具有检出率高等特点。
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