Pressurizer is one of the most important components in the nuclear reactor system. Its function is to keep the pressure of
the primary circuit. It can prevent shutdown of the system from the reactor accident under the normal transient state
while keeping the setting value in the normal run-time. This paper is mainly research on the pressure system which is
running in the Daya Bay Nuclear Power Plant. A conventional PID controller and a fuzzy controller are designed
through analyzing the dynamic characteristics and calculating the transfer function. Then a fuzzy PID controller is
designed by analyzing the results of two controllers. The fuzzy PID controller achieves the optimal control system
For the fusion of urban multi-spectral images, three extracted characteristics are merged by a multi-characteristics fusion
rule. The fusion result performs well in both spectral information and spatial information.