By using the continuation theorem of coincidence degree theory,a three-species-nonautonomous predator-prey-chain patchy system with outer supply is considered,the existence of positive periodic solution for such a system is obtained,and application to special system is given.

Since Java thread cannot be notified according to priority while multithreading accessing the critical resource,a component that could notify waiting thread based on priority was designed.

To aim at the situation that in multiprogramming environment,the use of mutex has such disadvantages as different standards,complex rules,prone to deadlock,a new method is proposed which extends the C++ standard grammar to incorporate in some critical resource define and access .

The algorithm can not only access the critical resource synchronously,based on sending messages and passing tokens in the computer network with no requirement for logical structure,but also commendably resolve the failure-recovery problems caused by the loss of request and token,etc.

Only this could we get the initiative in the international minerals market and resources-oriented diplomacy.

The Research on External Financing Predicament and Countermeasures of the Private Enterprises;

Because of the own condition, external environment and other reasons of private economy, the funds needed of most private enterprises, during the course of their development, are seriously depended on the internal financing channel, while the external financing channel is not smooth and it becomes the bottleneck restricting the development of the private economy.

This paper analyzes the present situation of internal financing and external financing of small and medium-sized enterprises,and probes into the problems existing in the financing of small and medium-sized enterprises from three aspects of the enterprise itself,the current financial system and the government.