Geometry model of roller bit's sphere tooth, wedgy tooth and bucket shape tooth were established;
建立了牙轮钻头的球形齿、楔形齿和勺形齿三维空间的几何模型；
2
An diffusion Synthetic acceleration equation and differencing scheme (DSA) for the diamond scheme of the one-dimensional spheregeometry steady neutron transport equation is introduced in this report.