The inversion results of the Pg data acquired by wide-angle seismic reflection/refraction data of 11 shots reveal that the basement velocity structure of the eastern part of A\'nyemaqen suture zone is characterized by a low velocity zone while the velocity is even in its adjacent areas.

Effects of irregular topography and low velocity layer on reflections.;

It is difficult to make certain of suitable shooting layers by ordinary shallow survey methods in Youquanzi area of Qiadam basin because of significant thickness of dry layer on the surface and thick low velocity layers (LVL).

Using refraction method to detect low velocity layer in intricate area is difficult in field and poor in effect, generally.

Characteristics of low-speed streaks in near-wall turbulence as disturbed by cylinder wakes;

The characteristics of low-speed streaks in the near-wall region of turbulent cylinder wake/boundary layer interacting flows are investigated employing hydrogen bubble flow visualization.