Comparative study of LC and OC in high-risk and elderly patients;

Considering the complicated situations such as uncertainly in strata pressure, high abnormal pressure coefficient, strata being easy to collapse, co-existence of well blowout and lost circulation etc, the article analyzes technical difficulties of drilling fluid with super high density, decides prescription of drilling fluid with density of over 2.

This paper analyzes the material mechanical properties of domestic new alloy steel 38SiMnVBE with high cost performance and super strength,and the material mechanical properties of foreign typical high performance alloy structure steels,as well as their applications in automotive components and parts.

Effect of Cu Content on Mechanical Properties of Ultra High Strength Low Carbon Bainitic Steel;

Using rapid solidification (RS) and powder metallurgy (PM) technique, Al90Mn8Ce2 bulk alloy with ultra high strength and 20 mm in diameter and 10 mm in length has been prepared.