The asymmetric profile of gear can be formed automatically from Profile of gear hob by running the program, and profile figures of tooth are drawn with the AUTOCAD software.

The characteristic of Asymmetric profile gou pumps is studed thooretically the formch of flow quantity and flow fluduation is deduced and a theoretical bokground is provided for the manufacturing this kind of gear purnps by our own nation in the future.

By analyzing the solution’s statistical distribution, this paper gives a relative theorem, which expounds that its distribution is the symmetrical distribution and the occurrence probability of the negative component is bigger than zero.

Some properties of ramdon variable of symmetrical distribution are discussed.

This article will discuss the formal characteristics of Chinese traditional architecture from such aspects as symmetry layout , group co.

In this paper,we extend the interchangeable concept of finite random variable to sequence of random variable,and establish one to one correspondence of the interchangeable sequence of random variable,the symmetric and consistent distribution function family and the symmetric distribution law of enumerable infinite dimension space.

This paper presents new estimator for the symmetric distribution function.

Modified MUSIC algorithm is applied to DOA estimation,arranging array symmetrically is designed.