However,when the lath width is in nanoscale,it should make greater contribution to the strength and toughness of steel.

According to the principle of measuring torsion by the change of fringe width, the relationship is researched between the change of moiré fringe’s width and measurement precision in order to improve measurement precision of ship torsion angle.

This paper analyzes the deviation of cambered form witch is composed of batten and sheet in concrete construction,and then educes a relationship between width of sheet,deviation of cambered form and curvature radius of camber,in order to solve the problem of assemble spline formwork and increase construction quality of concrete curved surface.