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A new concept of an equi-attractor is introduced, and defined by the minimal compact set that attracts bounded sets uniformly in the past, for a non-autonomous dynamical system. It is shown that the compact equi-attraction implies the backward compactness of a pullback attractor. Also, an eventually equi-continuous and strongly bounded process has an equi-attractor if and only if it is strongly point dissipative and strongly asymptotically compact. Those results primely strengthen the known existence result of a backward bounded pullback attractor in the literature. Finally, the theoretical criteria are applied to prove the existence of both equi-attractor and backward compact attractor for a Ginzburg-Landau equation with some varying coefficients and a backward tempered external force. 相似文献
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研究了如下一类奇异非局部问题■。其中Ω??~N(N≥3)是一个有界开区域且具有光滑边界?Ω,a,b≥0且a+b0,m0,λ≥0,1p≤2~*,0γ1,系数函数■为非零非负函数.结合变分方法和临界点理论,获得了该问题的一个正解的存在唯一性。 相似文献
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研究含变指数时滞项和源项的粘弹性方程:utt+△2u-M(‖▽u‖2)△u+∫0tg(t-s)△u(s)ds+μ1|ut(x,t)|(r(x)-2)ut(x,t)+μ2|ut(x,t-τ)|(r(x)-2)ut(x,t-τ)=|u|(p(x)-2)u.利用凸性方法,证明了当该方程的初边值问题的初始能量为负值时,其能量解存在有限时间爆破. 相似文献
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