Upper Semicontinuity Of Pullback Attractors For A Non-autonomous Viscoelastic Equation

This paper is concerned with upper semicontinuity of pullback attractors,for a non-autonomous viscoelastic equation with a past history with a nonautonomous per-turbation.(?)In particular,under some proper assumptions,we prove that,the pullback attractor{A?(t)}t ?R of Equation with ?>0 and the global attractor A of Equation with ?=0 satisfy lim ??0+ distX(A?(t),A)= 0 for any t ? R.