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-DCFDFD）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。
Five triterpenoids were isolated and their structures were identified to be cauloside C (1), akebiasaponin D (2), akebiasaponin F (3), ursolic acid (4) and hederagenin (5).
分离鉴定了5个三萜类化合物：葳岩仙皂苷C（1）、木通皂苷D（2）、木通皂苷F（3）、 熊果酸（4）和常春藤皂苷元（5）。
Two computationally efficient state-space structures for general 2-D digital systems described by Roesser's local state-space model are presented.
本文给出了一般二维数字系统的两种高效率状态空间结构；
In order to connect and fix all kinds of structures, there are usually a lot of threaded joints in the 2-d woven composite structures.
为了联接和固定各种结构，经常需要在二维编织复合材料结构上采用大量的螺纹联接。
Methods 49 patients with venous valvular insufficiency were examined using 2-D color Doppler flow imaging to observe the anatomic structures of valves and hemodynamics of venous flow in legs.
方法应用二维彩色多普勒血流显像检查下肢静脉瓣功能不全49例，观察下肢静脉血管及瓣膜的解剖结构和血流动力学的改变。
Methods 49 patients with venous valvular insufficiency were examined using 2-D color Doppler flow imaging to observe the anatomic structures of valves and hemodynamics of venous flow in legs.
方法应用二维彩色多普勒血流显像检查下肢静脉瓣功能不全49例，观察下肢静脉血管及瓣膜的解剖结构和血流动力学的改变。
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