This paper firstly calculates the value of beta and downside beta on the basis of the standard deviation and downside standard deviation,and then in the framework of Estrada,by using closed-end funds data in the past five years empirically,it analyzes and compares the two methods of risk measuring.

After that, two failures occurred: there in the lower tower, resistance was too small to establish operation condition; Air through the plate wing heat exchangers biased seriously, resulting in big resistance of air to the tower.

The fault causes of carbon dioxide blockage in lower tower of the air separation device under the condition that cooling was guaranteed were analyzed.

Making full use of knowledge in manufacturing tolerance analysis combined with the beta distribution model is introduced and applied.

Considering the step by step improvement in the related knowledge and information, a dynamic and recurring method is advocated of assessing the containment with Bayes theorem and the solution is obtained to the problem in its practical application: how to set forth a prior Beta distribution.

The 8087 s instructions are estimated with beta distribution and normal distribution separately, the whole program s execution time is approximated with normal distribution after adding instruction.

The simplified index model which is based on total returns is often used to estimated security betas,which is no theoretical foundation.

A Primary Study of Bertalanffy s Interdisciplinary Thinking;

Exploraton on Bertalanffy s Education View of General System Theory with Complexity;