In this paper, the influence of plasma arc powder surfacing technical parameters on the property of layer is defined using the orthogonal design. By the orthogo
By using interview data from three large state-owned enterprises (SOEs) in agriculture related industries,this paper reveals that SOEs in inland area are much s
In order to improve the manufacturing quality of electron beam welding,some technologies are developed by using the special features of electron beam.Comparing
As early as in 1990, Professor Sun Yongsheng, suggested his students at Beijing Normal University to consider research problems on the unit sphere. Under his gu