A note on boundary integral equations and their kernel functions for Laplacian, Helmholtz and elastodynamic problems.

Gaussian-Legendre integral rules over 1D intervals and Gaussian quadrature rules over triangles.

运用高斯积分对复合函数进行求解，并附有注释- Gaussian integral

Abstract—The proportional integral derivative (PID) controller is the most widely used control strategy in industry. The popularity of PID controllers can be attributed partly to their robust performance in a wide range of operating conditions