The open-guiding ring was designed to ensure its functionsof direction position and bearing side pressure and weight.
为保证开口型导向环的导向定位和承受侧压力等载荷的作用，对其进行了设计研究。
2
Making use of the good properties of cryptography Hash functions and the difficulties of DLP, a verifiable and linkable ring signature scheme is constructed.
利用密码哈希函数的良好性质和DLP的困难性问题，构造了一个可验证可关联的环签名方案。
3
In this paper, diffraction integral equations and Bessel Functions are used to getting perfect solution of Fraunhofer ring aperture diffraction, and the diffraction pattern is analysed.