z You pick any two components, say the x and the z component, and you take the partial of the x component with respect to z, fz and you must make them equal. And the same with every pair of variables.
Aimed at the difficulty in calculating an electrically large size antenna by using MOM, a far zone approximate method based on MOM (MOM-FZ) was presented for calculating radar antenna pattern.
It is introduced a puller applied to purification of rare earth (RE) material, according to the float zone (FZ) technics of crystal growing, interprets main structure and characteristic of the puller.