The conversion formula between the polar angle and the generating angle and calculating steps during measuring the gear involute error by the polar coordinate measuring method are presented.

The article discusses the elliptic equations with polar angle as a parameter, and gives estimations of elliptic arc length and their relational conditions through analyzing the change s law of element of arc length, and the geometric significance of the estimations are used to describe the change of linear velocity of the particle s motion on the ellipse.

Finally,the convex hull is constructed for the plant leaf with gift wrapping method based on bidirectional polar angle.

This(paper) presented a parameter estimation technique of polar tilt angle and azimuthal orientation angle of BAM images according to the variations of analyzer angles.

This paper introduces the concept of the electromagnetic polarization first,and proposes a 2-stage regulating method based on analyzing the function of the polarization angle regulator.

A simple and convenient method of calculating formula of polarization angle is deduced by using cosine theorem and sine theorem of spherical triangle.

When communicating through linearly polarized satellite transponder,the shipborne earth station usually adjusts the antenna polarization plane to adapt to the variety of polarization angle caused by position change to assure that the cross polarization isolation satisfies the specification requirement.

The quick return characteristics of planar linkage mechanisms have closely relationship with its crank angle θ between the two limiting positions.