methods Tweenty cases of pineal region tumors were resected by infratentorial supracerebellar approach in the patients taking sitting position.

Three dimension finite element analysis of the stress distribution on sacroiliac joint surface in sitting stance;

The signals of lumber erector spinae,thoracic erector spinae?rectus abdominis in relaxing sitting position,forward sitting position?backward sitting position were collected.

By analyzing for risk and feasibility of open hole well testing, actual experiences and lessons applied in Shengli oilfield have been summarized systemically and study on mud, setting site, down hole, string structure and work system has been done, a general way and technical point has been suggested which helps to push forward this tech and increases economic benefit.

According to angle measuring concept of Helmet Mounted Sight(HMS) in fire control electro optic aiming system on a certain type of airplane, and slant range data of its laser range finder, a mathematic model for correcting INS heading and position coordinates is presented, and its application is discussed further.