| 
        
          | Contents |  
          | In this lecture, we shall introduce time periodic solutions of differential equations arised from different occasions. We then turn our attention to the GFDs and viscous Burgers' type equations and study the asymptic stabilities of the solutions.  In particular, two
 different approaches will be
 introduced to prove the existence of time periodic solutions of GFDs
 with time periodic focrings. |  |