The results of compound factors correlation analysis show that,on the principal components analysis of critical factors which influence undergrowth diversity,annual rainfall is the first main factor(limiting factor) influenci.

Combining mixture of factor analysis method with hidden Markov modeling techniques,a new statistical acoustic model was constructed:hidden Markov model based on mixture of factor analysis(HMM-MFA).

This paper investigates the combined traditional hidden Markov modeling technology with mixture of factor analysis.

The author try to use the Delphi and AHP method to construct the evaluation model of its main elements and index system,to use the comprehensive factor analysis method to carry out the quantitative evaluation on main elements of Ireland ICT innovation cluster,to some degree,the evaluation results can reflect the status of the cluster,which show that the model and its evalu.

This paper gives the definition of complex integrating factor about differential equation.

The auther gived the definition of complex integrating factor about differential equation M(x, y)dx + N(x, y)dy = 0, then obtained the necessary and sufficient condition of the existence of complex integrating factor and its calculating formula.

this article gives the new definition of complex integrating factor about two dimensional differential automatic system and types of new existence theorem and calculation formula,the resucts in this paper amplifies the conclusions in the relevant reference.