Prefessional Taedium vitae of teachers is one important psychological factor constraints the full display of professional teachers' potential and their achievement in teaching.
To improve the robustness of the Minimum Variance Distortionless Response (MVDR) beamforming to the array steering vector, a quadratic constraint method is proposed.
The contact between welding plate and fixture is treated as constraint in the finite element model of dynamic welding angular distortion simulation for overlayer in CO2 gas arc welding.