Mathematical Sciences: Dynamics and Kinetics of Spatially Extended Systems

数学科学：空间扩展系统的动力学和动力学

• 批准号: 9530637
• 负责人: Leonid Bunimovich
• 金额: $ 12.3万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-15 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9530637&HistoricalAwards=false
• 关键词: Mathematical; Sciences; Dynamics; Kinetics; Spatially

Abstract Bunimovich The proposed research deals with the dynamics of spatially extended systems. The systems under study include nonlinear hyperbolic partial differential equations, lattice dynamical systems (in particular, coupled map lattices), lattice gas cellular automata and the systems of interacting particles. The pattern formation problem will be studied as well as order-chaos transitions. Most of the questions that will be addressed have their origin in physics and hydrodynamics, and were transformed into the mathematical form by the principal investigator with collaborators during the last fifteen years. A broad approach will be used that combines methods of the ergodic theory, the theory of nonuniformly hyperbolic dynamical systems, stability theory of infinite dimensional dynamical systemq and the theory of bifurcations. The recent breakthrough in the understanding of a complex (chaotic) dynamics of systems evolving in time (dynamical systems) was connected with the studies of nonextended (point) dynamical systems whose dynamics can be completely described by measurements performed at a single point of a real (physical) space. Evolution of extended systems such as the flow of fluids and gases, large systems of interacting elements in electronics (e.g. Josephson junctions) needs to be studied in space and time simultaneously. The purpose of this research is to pursue the adequate approaches to study such space-time evolution and to develop algorithms to evaluate quantities that characterize space-time dynamics. The other novelty is the study of systems with dynamics which have both random and deterministic components (but not small, random perturbations of deterministic systems or vise versa). Most of systems in applications are of this type, e.g. in chemistry, artificial intelligence, in the management of warehouses etc.

抽象布尼莫维奇 拟议的研究涉及空间扩展系统的动力学。所研究的系统包括非线性双曲型偏微分方程、格点动力学、 系统（特别是耦合映射格子），格子气细胞自动机和相互作用粒子系统。图案形成问题将被研究，以及秩序混沌过渡。 将讨论的大多数问题都源于 物理学和流体力学，并转化为数学形式的主要研究者与合作者在过去的十五年。将采用一种广泛的方法，结合遍历理论，非一致双曲动力系统理论，无穷维动力系统稳定性理论， 和分叉理论。 最近在理解随时间演化的系统（动力系统）的复杂（混沌）动力学方面的突破与非扩展（点）动力系统的研究有关，非扩展（点）动力系统的动力学可以完全通过测量来描述 在真实的（物理）空间的单个点处执行。扩展系统的演化，如流体和气体的流动，电子学中相互作用元件的大系统（例如约瑟夫森结），需要同时在空间和时间上进行研究。 本研究的目的是追求适当的方法来研究这种时空演化，并开发算法来评估表征时空动力学的量。另一个新奇是研究具有随机和确定性成分的动态系统（但不小，确定性系统的随机扰动，反之亦然）。应用中的大多数系统都是这种类型的，例如化学，人工智能，仓库管理等。