Spatio-Temporal Chaos in Systems of Broken Symmetry

这个实验项目将继续研究扩展动力系统中的非线性、非平衡模式形成现象。 感兴趣的系统是在两个平行板之间的加压气体中发现的热对流。 这个系统和其他许多系统一样，呈现出非瞬态的状态，在这种状态下，空间和时间的相关性迅速下降。 这些复杂的状态被称为“时空混沌”（STC），近年来受到了广泛的关注。 在这个项目中解决的一个悬而未决的问题是如何与STC交互，甚至控制STC。 这项研究将解决热对流如何响应空间和时空强迫。 将应用两种类型的强制方案。 第一种使用的是康奈尔大学纳米制造设施制造的微加工表面，第二种是热压印技术。 更好地了解STC可能会影响基础科学领域，如物理学，生物学和医学，但也应用领域，如加热技术，材料加工等实验结果也将提供一个基准的数值代码开发解决流体动力学问题的超级计算机。 这项研究包括与W. Pesch（德国）和Steve Lipson（以色列）。 此外，还将继续与太平洋大学的Richard Wiener合作。 参与该项目和该研究小组的研究生接受尖端实验技术的培训，范围从微细加工、机械和电子系统设计到数字图像处理。 这种经验为研究生提供了培训和准备的职业生涯中，工业和government.This实验研究计划继续调查模式的形成，发生在两个平行板之间的加压气体中的热驱动流。 这些图案在光学上是可见的，因为气体中的自发密度波动。 该项目将研究流动显示高度无序对流模式的情况。 这样的情况也发生在日常生活中;一个例子是天空中的条纹云条纹或风吹沙的重复模式。 这些复杂模式的动力学是当前重要的科学兴趣。 在这个研究项目中要解决的一个重要问题是如何与这些在空间和时间上都是混沌的状态进行交互甚至控制。 这项研究计划将解决这个问题，通过使用微加工表面，在康奈尔大学的纳米制造设施和使用热压印技术。 更好地了解这些时空混沌状态及其控制可以对基础科学产生影响，如物理学，生物学和医学（如心脏纤维性颤动，癫痫），以及技术，如加热技术，材料加工等。Pesch（德国）和Steve Lipson（以色列）。 此外，还将继续与太平洋大学的Richard Wiener合作。 参与该项目和该研究小组的研究生接受尖端实验技术的培训，范围从微细加工、机械和电子系统设计到数字图像处理。 这种经验为研究生提供培训和准备职业生涯中，工业和政府。

This experimental project will continue investigations of non-linear, non-equilibrium pattern-forming phenomena in extended dynamical systems. The system of interest is thermal convection found in pressurized gases confined between two parallel plates. This system, and many others, exhibits non-transient states in which spatial and temporal correlations fall off quickly. These complex states are termed "Spatio-Temporal Chaos"(STC), and have received much attention in recent years. An open question addressed in this project, is how to interact with or even control STC. The research will address how thermal convection responds to spatial and spatio-temporal forcing. Two types of forcing schemes will be applied. The first uses micro-machined surfaces that are manufactured at Cornell's Nano Fabrication Facility, the second a thermal imprinting technique. Better knowledge of STC may potentially impact fundamental science areas such as physics, biology, and medicine, but also applied areas, like heating technology, materials processing, etc. The experimental results will also provide a benchmark for numerical codes developed for solving hydrodynamical problems on supercomputers. The investigation includes an international collaboration with Prof. W. Pesch (Germany) and Steve Lipson (Israel). In addition, a collaboration with Richard Wiener from Pacific University will be continued. Graduate students involved in the project and in this research group receive training in cutting edge experimental techniques ranging from microfabrication, design of mechanical and electronic systems, to digital image processing. This experience provides graduate students with training and preparation for careers in academe, industry, and government.This experimental research program continues an investigation into the pattern formation that occurs in thermally driven flows in pressurized gases confined between two parallel plates. The patterns are visible optically as spontaneous density fluctuations in the gas. The project will examine situations where the flow shows highly disordered convection patterns. Such situations also occur in everyday life; an example is striped cloud-streaks in the sky or in the somewhat repetitive patterns of windblown sand. The dynamics of these complex patterns is significant current scientific interest. An important question that will be addressed in this research program is how to interact with or even control these states that are chaotic both in space and time. This research program will address this question by using micro-machined surfaces that are manufactured at Cornell's Nano Fabrication Facility and by using thermal imprinting techniques. A better knowledge of these spatio-temporal chaotic states and their control can have an impact in both fundamental science, like physics, biology, and medicine (as in cardiac fibrillation, epilepsy), as well as in technology, like heating technology, materials processing, etc. The investigation includes an international collaboration with Prof. W. Pesch (Germany) and Steve Lipson (Israel). In addition, a collaboration with Richard Wiener from Pacific University will be continued. Graduate students involved in the project and in this research group receive training in cutting edge experimental techniques ranging from microfabrication, design of mechanical and electronic systems, to digital image processing. This experience provides graduate students with training and preparation for careers in academe, industry, and government.