On the Cooperation between Northern Wei and Man Nationality of the Intermediate Zone in Northern and Southern DynastiesFocus on the cooperation between Northern Wei and Tian Yizong and Huan Dan;

The “scramble between Jinzhou and Yangzhou” was not only the result from the politics of big families but also from Eastern Jin carrying out the intermediate zone strategy in order go defend its state.

During the period of Three States,Wei,Shu and Wu scrambled for the minorities in the intermediate zone.

It s an important content to the thinking of Zedong Mao s international united front, which s from the thinking of"the intermediate zone"to the theory of"the three world".

Mao Zedong,the founding father of New China,noticed acutely the changes in international situation,and elaborated the theory of "intermediate zones ",and finally developed it into the division of the "three worlds",the inner logic of this development contains the understatement that the world situation will go multi-polarized.

The distribution area,climatic factors,mid-domain effect(MDE) and Rapoports elevation rule were the most important influencing factors upon the altitudinal distribution pattern of species richness,and MDE was the most powerful explanatory variable,and sometimes it was the only variable that significantly correlated with the distribution pattern of species richness.

Simulation test on collision of vehicles on guard-rail of expressway median;

Corrugated-beam guard-rail height of expressway median;

Safety lateral clearance of expressway median;