A Remark on Gauge Transformations and the Moving Frame Method

A remark on observability of the wave equation with moving boundary

We deal with the wave equation with assigned moving boundary ($0<x<a(t)$) upon which Dirichlet or mixed boundary conditions are specified, here $a(t)$ is assumed to move slower than the light and periodically. Moreover $a$ is continuous, piecewise linear with two independent parameters. Our major concern will be an observation problem which is based measuring, at each $t>0$ of the transverse velocity at $a(t)$. The key to the results is the use of a reduction theorem.

关于运动区域中线性化微极流体系统分层控制的注记

Remarks on Hierarchic Control for a Linearized Micropolar Fluids System in Moving Domains

本文研究运动边界区域内线性化微极流体方程的分层Stackelberg控制策略，推导纳什均衡的存在唯一性与刻画、系统对领导者控制的近似能控性，以及Stackelberg-Nash问题的适定性与领导者最优性系统。

Remark on some conformally invariant integral equations: the method of moving spheres

We study some conformally invariant integral equations using the method of moving spheres.

Moving-Frame Approach to Nonlinear Internal Waves in Oceans

In this article, we introduce a moving-frame approach to the geophysical equation of two-dimensional uniformly stratified rotational fluid in oceans and find a family of exact solutions containing ten arbitrary parameter functions.

Asymmetric and Moving-Frame Approaches to MHD Equations

The magnetohydrodynamic (MHD) equations of incompressible viscous fluids with finite electrical conductivity describe the motion of viscous electrically conducting fluids in a magnetic field. In this paper, we find twelve families of solutions of these equations by Xu's asymmetric and moving frame methods. A family of singular solutions may reflect basic characteristics of vortices. The other solutions are globally analytic with respect to the spacial variables. In particular, Bernoulli equation and Wronskian determinants play important roles in our approaches. Our solutions may also help engi…

Asymmetric and Moving-Frame Approaches to Navier-Stokes Equations

In this paper, we introduce a method of imposing asymmetric conditions on the velocity vector with respect to independent variables and a method of moving frame for solving the three dimensional Navier-Stokes equations. Seven families of non-steady rotating asymmetric solutions with various parameters are obtained. In particular, one family of solutions blow up at any point on a moving plane with a line deleted, which may be used to study turbulence. Using Fourier expansion and two families of our solutions, one can obtain discontinuous solutions that may be useful in study of shock waves. Ano…