Abstract: Abstract. Rotary axial percussion drilling is a high-speed drilling technology that has been widely applied. However, the traditional single-impactor arrangement has low drilling efficiency, is prone to intensify drillstring ...

Abstract: Sand excavations at river beds have compromised the safety of several bridges in recent years. An expressway that connects a huge line bridge is selected as the research object in this study. The phenomenon of the excessive ...

Abstract: Rapid solidification techniques such as electron beam additive manufacturing are considered as promising pathways for manufacturing Nb-Si-based alloys for ultra-high-temperature applications. Here, we investigate the ...