Jinqiao Duan, Hongjun Gao and Xinchu Fu
Almost Periodic Passive Tracer Dispersion 
(22K, latex)

ABSTRACT.  The authors investigate the impact of external sources 
on the pattern formation of concentration profiles 
of passive tracers in a two-dimensional shear flow. 
By using the pullback attractor technique for the 
associated nonautonomous 
dynamical system, 
it is shown that a unique time-almost periodic concentration profile 
exists for time-almost periodic external source.