Norms of Modes and Quasi-modes revisited

对准线性抛物型系统Cauchy问题的重新审视

The Cauchy Problem For Quasi-Linear Parabolic Systems Revisited

本文重新审视了准线性抛物型系统Cauchy问题的局部适定性，探讨了Sobolev和Besov空间中的解的存在性，并在SKT系统中验证了非负强解的存在。

The stability of nonlinear Schrödinger equations with a potential in high Sobolev norms revisited

We consider the nonlinear Schrödinger equations with a potential on $\mathbb T^d$. For almost all potentials, we show the almost global stability in very high Sobolev norms. We apply an iteration of the Birkhoff normal form, as in the formulation introduced by Bourgain \cite{Bo00}. This result reprove a dynamical consequence of the infinite dimensional Birkhoff normal form theorem by Bambusi and Grebert \cite{BG}

Lower bounds for possible singular solutions for the Navier--Stokes and Euler equations revisited

In this paper we give optimal lower bounds for the blow-up rate of the $\dot{H}^{s}\left(\mathbb{T}^3\right)$-norm, $\frac{1}{2}<s<\frac{5}{2}$, of a putative singular solution of the Navier-Stokes equations, and we also present an elementary proof for a lower bound on blow-up rate of the Sobolev norms of possible singular solutions to the Euler equations when $s>\frac{5}{2}$.