Mathematics

Nonlinear parabolic-hyperbolic coupled systems and their by Yuming Qin

By Yuming Qin

This e-book provides contemporary effects about the international life in time, the large-time behaviour, decays of ideas and the lifestyles of world attractors for a few nonlinear parabolic-hyperbolic coupled platforms of evolutionary partial differential equations bobbing up from physics, mechanics and fabric technology, comparable to the compressible Navier-Stokes equations, thermo(visco)elastic platforms and elastic platforms. to maintain the ebook as self-contained as attainable, the 1st bankruptcy introduces to the wanted effects and instruments from sensible research, Sobolev areas, differential and fundamental inequalities in research, and the idea of semigroups of linear operators and of world attractors.

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Global Attractors 41 If A is an attractor, then the maximal open set U satisfying (ii) is called the basin of attraction of A. According to the above definition, it can be also said that A attracts points of U. If a subset B ⊆ U satisfies dist(S(t)B, A) ≡ sup inf d(x, y) → 0, as t → +∞, x∈S(t )B y∈A then A is said to uniformly attract B, or simply A attracts B. 8. If A is a compact attractor, and it attracts bounded sets of E, then A is called a global attractor or universal attractor. 1. It is easy to verify that a global attractor is maximal among all bounded attractors or bounded invariant sets in the sense of inclusion.

Ladyzhenskaya, Solonnikov and Uralceva [208], Levine [220–222]) is very useful to prove the nonexistence of global solutions to differential equations. 1. 1) where γ > 0 and C1 , C2 ≥ 0. 6) 26 Chapter 1. 7) (0) . 8) Glassey [122, 123] used the following theorem to establish the blow-up of solutions to nonlinear wave equations. 2. Assume that φ(t) ∈ C 2 satisfies φ (t) ≥ h(φ) (t ≥ 0) and φ(0) = α > 0, φ (0) = β > 0. If for all s ≥ α, h(s) ≥ 0, then in the domain of φ (t), we have φ (t) > 0 and t≤ φ(t ) α s [β 2 + 2 α h(ξ )dξ ]−1/2 ds.

Suppose that φ(t) is a non-negative continuous nonincreasing function on R+ satisfying the inequality 2 (1 + t)θi [φ(t) − φ(t + T )] i , f or t ≥ 0 φ(t + T ) ≤ C i=1 with some T > 0, C > 0, 0 < decay properties: (i) If 0 < i < 1 with 1 + i ≤ 1 and θi ≤ i 2 < 1 and θi < i, (i = 1, 2). Then φ(t) has the following i = 1, 2, then φ(t) ≤ C0 (1 + t)−γ with γ = mini=1,2 {( i − θi )/(1 − i )}, where we consider as ( i − θi )/(1 − i ) = ∞ if i = 1. 24 Chapter 1. Preliminary (ii) If θ1 = 1 < 1 and θ2 < 2 ≤ 1, then φ(t) ≤ C0 {log(2 + t)}− (iii) If θ1 = 1 < 1 and 2 1 /(1− 1 ) .

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