Browsing by Author Pham Truong Xuan

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  • BBTL.0000039_On a nonhumogeneous heat equation on the complex plane.pdf.jpg
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  • Authors: Duong Ngoc Son (2024)

  • In this article, we investigate the existence, uniqueness, and asymptotic behaviors of mild solutions of a parabolic evolution equations on complex plane, in which the diffusion operator has the form \(\overline{\Box}_{\varphi} = \overline{D}\, \overline{D}^{\ast}\), where \(\overline{D} f = \bar{\partial}f + \varphi_{\bar{z}} f\), the function \(\varphi\) is smooth and subharmonic on \(\mathbb{C}\), and \(\overline{D}^{\ast}\) is the formal adjoint of \(\overline{D}\). Our method combines certain estimates of heat kernel associating with the homogeneous linear equation of Raich \cite{raich06} and a fixed point argument.

  • BBTL.0000035_Phạm Trường Xuân.pdf.jpg
  • Bài báo/Newspaper


  • Authors: Tran Van Thuy (2024)

  • In this article, we investigate the existence, uniqueness and exponential decay of asymptotically almost periodic solutions of the parabolic-elliptic Keller-Segel system on a real hyperbolic manifold. We prove the existence and uniqueness of such solutions in the linear equation case by using the dispersive and smoothing estimates of the heat semigroup. Then we pass to the well-posedness of the semi-linear equation case by using the results of linear equation and fixed point arguments. The exponential decay is proven by using Gronwall's inequality.

  • TCTL.0000101_On certain classes of mild solutions of the scalar Liénard equation revisited.pdf.jpg
  • Bài báo/Newspaper


  • Authors: Tran Minh Nguyet (2024)

  • In this work we revisit the existence, uniqueness and expo- nential decay of some classes of mild solutions which are almost periodic (AP-), asymptotically almost periodic (AAP-) and pseudo almost peri- odic (PAP-) of the scalar Lin ́eard equation by employing the notion of Green function and Massera-type principle. First, by changing variable we convert this equation to a system of first order differential equations. Then, we transform the problem into a framework of an abstract parabolic evolution equation which associates with an evolution family equipped an exponential dichtonomy and the corresponding Green function is exponen- tially almost periodic.

  • BBTL.0000038_Periodic solution for Boussinesq systems in weak-Morrey spaces.pdf.jpg
  • Bài báo/Newspaper


  • Authors: Pham Truong Xuan (2024)

  • We prove the existence and polynomial stability of periodic mild solutions for Boussinesq systems in critical weak-Morrey spaces for dimension n > 3. Those systems are derived via the Boussinesq approximation and describe the movement of an incompressible viscous fluid under natural convection filling the whole space R Using certain dispersive and smoothing properties of heat semigroups on Morrey-Lorentz spaces as well as Yamazaki-type estimate on block spaces, we prove the existence of bounded mild solutions for the linear systems corresponding to the Boussinesq systems. Then, we establish a Massera-type theorem to obtain the existence and uniqueness of periodic solutions to corr...