Qujiang becomes the cultural center of Chang an in Tang Dynasty because of it s favourable location: the mixture of dragon root and water root of Chang an, the capital of late Tang Dynasty.

Mechanisms and tests for hydraulic pulsed cavitating jet assisted drilling;

Design and experiment on hydraulic pulse vibration generator for cementing;

High-pressure hydraulic pulse is effective to deal with some engineering problems such as hydraulic breaking rock and cutting metals.

Based on fine de-scription of residual oil distribution,well pattern adjust-ment and pulse water injection were performed in Block7in Gudong oilfield to enlarge swept volume,to tap residual oil potential in low permeability zone,to reduce the area of region of bypassed oil and to improve utiliza-tion fact.

The corresponding relationship between pressure of air distributing pipe and pulsating current;