Moreover,we found that the main reasons of strip breaking were the gap width and height mismatch,we also discussed the steel grade and specification.

Relationship between butt joint gap and cold crack rate of 16 Mn steel underwater wet welding is studied.

Being quoted for the conditions that the bearing lubrication system of diesel generator has large volume,and bad reliability,this paper presents the method that the lubrication oil L-TSA68 should be replaced by the oil CD40 for diesel,explores the problems on selection of relative clearance and stability of operation of bearing,etc.

The curves of transmission and reflection changing from the relative gap width d/λ , incident angle θ 0 , and refraction index n were proposed.

The optimality conditions of the linear bilevel programming are discussed by using the duality theory of linear programming and it can be exactly transformed into a standard mathematical programming where the duality gap of the lower problem is appended to the upper objective with a penalty.

We obtain that the zero duality gap exists between this class of Lagrangian dual problem and the primal problem.

This paper gives an expression of the optimal value of objective function for the dual problem of nonconvex programming by using the convex hull of perturbation function without any convexity assumtion,and further gets an expression of duality gap.