Study on the parameter equation of hot spot s stress concentration factor in welded pipe joint;

Two notes for curvilinear parameter equation;

Two notes of parameter equation teaching;

Particle swarm optimization algorithm based on parametric equation method to handle equality constraints;

By the solution of the model,a calculating formula of the local dihedral angel of intersecting line and a parametric equation of contacting li.

A parametric equation to establish velocity field for the indentation of semi-infinite medium by a flat-round punch was proposed, and corresponding parametric integration to deformation power was performed as a new method in this paper.

Based on thermodynamics and combined with empirical equation of state,equation parameters are appropriately modified and a modified equation of state with multiple parameters is derived, which is more suitable for use.