Then the conclusions are drawn that Petri Net is fit for the modeling of closed and active system; UML Diagram is more fit for the modeling of open and reactive system; Petri Net is fit for the modeling of scare resources.
It is suggested that the program for the active pulse compression system can be accomplished by using a wire-type dispersive ultrasonic delay line. The experimental results of the active system are also given.
To process the un-predicated and complicated multi-tasks in EDI system, an active EDI transaction handling model and the structure-pattern of its rule-administrator were proposed, which could be used in EDI system and other active system by construction of status varibles, events, rules and actions.
The behaviour of crack initiation of A537 steel in 3.5%NaCl active system during low cyclic corrosion fatigue was studied by using three-electrode technique. Especially the effects of strain rate, strain amplitude and polarization were researched. The results showed that the crack initiation life decreased with the decrease in strain rate and the increase in strain amplitude.
The effect of polarization and frequency on the crack propagation behavior including crack propagation rate(CPR) and fracture surface was studied. The results showed that in A537/3.5%NaCl active system CPR increased with the decrease of frequency under serious polarization condition, but under cathodic protection condition, frequency had no effect on CPR.