Construction of Out-of-land Peasants Social Security and the System Restriction on Implementation;

Using the second method of Liapunov,by making the Liapunov function,discussing the balance point stability in a kind of food chain ecosystem with non-linear density restriction.

Studies the density restriction of tilapia in the closed aeration culture water and the chlorella influence,find that the tiptop biomass of tilapia fry was 4.

It is necessary to introduce contract system to construction enterprises operation and management,so as to adapt to the further development of the market economy,raise the level of business management,increase enterprise benefit and construct socialism harmonious society.

It is a necessity of historical development, building a harmonious society and enterprise development to establish a contract system for private enterprises.

Density dependence of Phalaris aruandinacea clonal population on middle mountain region of subtropical zone of China.;

A type anorexia system of the predatory spencies with density dependence;

The results showed it presented density dependence on birth rate, death rate and increase rate of population.

Based on the background of institutional transformation of China,this paper suggests that the household register system and the supporting policies endemic to China constructed the system restraints on the labor interregional mobility.

And this can expand two approaches to constructing public administrative ethics; system restraint and virtue inspiration.

The paper tries to obtain the system enlightenment about advancing consuming demand of our country from the analysis of the western consuming theory and its system restraint.

A class of predator-prey model with Holling type I functional response is considered,in which both of the species are density dependent.