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A local existence result for a plasma physics model containing a fully coupled magnetic field
Nonlinear stability of boundary layer solutions for generalized BenjaminBonaMahonyBurgers equation in the half space
1.  School of Mathematics and Statistics, Huazhong University of Science and Technology, Wuhan 430074, China 
2.  School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China 
$u_t$u_{txx}u_{xx}$+f(u)_{x}=0,\ \ \ \ \ t>0,\ \ x\in R_+, $
$u(0,x)=u_0(x)\to u_+,\ \ \ as \ \ x\to +\infty,$
$u(t,0)=u_b$.
Here $u(t,x)$ is an unknown function of $t>0$ and $x\in R_+$,
$u_+$≠$u_b$ are two given constant states and the nonlinear
function $f(u)$ is a general smooth function.
Asymptotic stability and convergence rates (both algebraic and
exponential) of global solution $u(t,x)$ to the above
initialboundary value problem toward the boundary layer solution
$\phi(x)$ are established in [9] for both the
nondegenerate case $f'(u_+)<0$ and the degenerate case $f'(u_+)=0$.
We note, however, that the analysis in [9] relies
heavily on the assumption that $f(u)$ is strictly convex. Moreover,
for the nondegenerate case, if the boundary layer solution
$\phi(x)$ is monotonically decreasing, only the stability of weak
boundary layer solution is obtained in [9]. This
manuscript is concerned with the nondegenerate case and our main
purpose is twofold: Firstly, for general smooth nonlinear function
$f(u)$, we study the global stability of weak boundary layer
solutions to the above initialboundary value problem. Secondly,
when $f(u)$ is convex and the corresponding boundary layer solutions
are monotonically decreasing, we discuss the local nonlinear
stability of strong boundary layer solution. In both cases, the
corresponding decay rates are also obtained.
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