Mathematical Sciences: Dynamics in Almost Periodic Parabolic Equations and Coupled Map Lattices

9402945沈阳提出了两个方面的研究：时间概周期抛物方程和格子动力系统。这两个领域在实际应用中经常遇到，例如，在神经脉冲传播理论和种群遗传学中经常出现时间几乎周期抛物型方程，耦合映射格子是描述流体动力学、化学反应系统、生物网络等各种时空结构的有用模型。尽管人们已经对这两个领域进行了大量的研究，但许多重要的基本问题仍然没有得到很好的理解。在对时间概周期方程组的研究中，沈从文将重点研究一般有界解的长期行为、特定解类型的存在性及其稳定性和分支、整体吸引子的存在性及其结构。同时，沈阳将特别关注在周期情形下不存在的概周期方程的性质(在她最近的工作和许多其他研究者的工作中有强有力的证据表明，时间概周期方程与周期方程有明显的不同)。在格子动力系统的研究中，沈阳计划发展一般方法来研究混沌解结构的存在，并为这类解建立稳定性判据和分叉场景。此外，沈还打算详细描述与神经脉冲传播、流体动力学、化学反应系统等有关的某些微分方程的离散形式的动力学行为。沈提出了两个领域的研究：时间概周期抛物方程和格子动力系统。这两个领域经常出现在不同的科学领域，如神经脉冲传播理论和种群遗传学、流体动力学中的混沌模式理论、化学反应系统、生物网络等。虽然已经对这两个领域进行了大量的研究，但许多重要和根本的问题仍然远未得到很好的理解。在这项研究中，沈将专注于一般有界解的长期行为，特定解类型的存在性，以及时间概周期方程解的整体吸引子的结构。此外，沈计划研究一般格子动力系统中的混沌解模式，并打算全面描述与神经脉冲传播、流体动力学、化学反应系统等有关的某些微分方程的离散形式的动力学行为。

9402945 Shen Shen proposes research in two areas: time almost periodic parabolic equations and lattice dynamical systems. Both areas are frequently encountered in applications, for example, time almost periodic parabolic equations often occur in the theory of nerve pulse propagation and population genetics, coupled map lattices serve as useful models to describe various spatio-temporal structures in fluid dynamics, chemically reacting systems, biological networks, etc. Though much research has already been devoted to these two areas, many important and fundamental issues are still far from being well understood. In doing research on time almost periodic equations, Shen will focus on the long term behavior of general bounded solutions, the existence of specific solution types and their stability and bifurcations, the existence of global attractors and their structures. Meanwhile, Shen will pay particular attention to those properties of almost periodic equations which do not arise in the periodic case (there is strong evidence in her recent work and the work by many other researchers that time almost periodic equations are distinctively different from periodic ones). In doing research on lattice dynamical systems, Shen plans to develop general ways to study the existence of chaotic solution structures and to establish stability criteria and bifurcation scenarios for these classes of solutions. Moreover, Shen intends to give a detailed description of the dynamical behaviors for discrete versions of certain differential equations related to nerve pulse propagation, fluid dynamics, chemically reacting systems, etc. Shen proposes research in two areas: time almost periodic parabolic equations and lattice dynamical systems. Both areas are frequently encountered in various fields of sciences, such as the theory of nerve pulse propagation and population genetics, the theory of chaotic patterns in fluid dynamics, chemically reacting systems, biological networks, e tc. Though much research has already been devoted to these two areas, many important and fundamental issues are still far from being well understood. In this research, Shen will focus on the long term behavior of general bounded solutions, the existence of specific solution types, and the structure of global attractors for time almost periodic equations. Moreover, Shen plans to study chaotic solution patterns in general lattice dynamical systems and intends to give a comprehensive description of dynamical behaviors for discrete versions of certain differential equations related to nerve pulse propagation, fluid dynamics, chemically reacting systems, etc.