CPAA
Boundedness of solutions for a class of impact oscillators with time-denpendent polynomial potentials
Daxiong Piao Xiang Sun
In this paper, we consider the boundedness of solutions for a class of impact oscillators with time dependent polynomial potentials, \begin{eqnarray} \ddot{x}+x^{2n+1}+\sum_{i=0}^{2n}p_{i}(t)x^{i}=0, \quad for\ x(t)> 0,\\ x(t)\geq 0,\\ \dot{x}(t_{0}^{+})=-\dot{x}(t_{0}^{-}), \quad if\ x(t_{0})=0, \end{eqnarray} where $n\in N^+$, $p_i(t+1)=p_i(t)$ and $p_i(t)\in C^5(R/Z).$
keywords: Canonical transformation Time-dependent polynomial potentials Moser's small twist theorem. Boundedness of solutions Impactor oscillators
DCDS
A new method for the boundedness of semilinear Duffing equations at resonance
Zhiguo Wang Yiqian Wang Daxiong Piao
We introduce a new method for the boundedness problem of semilinear Duffing equations at resonance. In particular, it can be used to study a class of semilinear equations at resonance without the polynomial-like growth condition. As an application, we prove the boundedness of all the solutions for the equation $\ddot{x}+n^2x+g(x)+\psi(x)=p(t)$ under the Lazer-Leach condition on $g$ and $p$, where $n\in \mathbb{N^+}$, $p(t)$ and $\psi(x)$ are periodic and $g(x)$ is bounded.
keywords: periodic nonlinearity Moser's theorem. boundedness Hamiltonian system at resonance

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