U.S.-Brazil Collaborative Research: Pattern Forming Instabilities in Directional Solidification - Experimental Tests of Non-Steady-State Theory

9512708康明斯提议的美国-巴西合作研究将使用与金属合金密切相关的一类材料的实验来测试最近提出的界面演化的非稳态理论。根据1965年发现的材料，利用视频显微镜和计算机图像分析技术，将观察、提取和分析界面剖面和溶质浓度场的相关特征。该项目由纽约城市大学的赫尔曼·康明斯和巴西贝洛奥里藏特米纳斯吉拉斯大学的奥斯卡·梅斯奎塔领导，将使用这两个地点可用的设备。第二个目标将是调查平面到细胞分叉的性质，以及对材料准备和设计的潜在影响。这项研究运用最新的方法解决了一个具有理论和实践意义的问题。攻击所提出的复杂、非线性问题的能力只是在过去几年才发展起来的，为所提出的研究开辟了道路。该项目将美国和巴西的调查人员与相关问题的经验配对，有望获得有价值的结果。***

9512708 Cummins The proposed U.S.-Brazil collaborative research will use experiments with a class of materials closely related to metallic alloys to test a recently advanced non-steady-state theory of interface evolution. Based on materials discovered in 1965 but using techniques of videomicroscopy and computerized image analysis, the relevant characteristics of the interface profile and solute concentration field will be observed, extracted, and analyzed. The project, led by Herman Cummins at CUNY in New York and Oscar Mesquita at the Universidade Federal de Minas Gerais in Belo Horizonte, Brazil, will use equipment available at both sites. A second objective will be to investigate the nature of the planar-to-cellular bifurcation, with potential implications for materials preparation and design. The research addresses a question of both theoretical and practical importance using the latest methods. The ability to attack complex, non-linear problems of the nature proposed has only developed in the past few years, opening the way for the proposed research. The project pairs U.S. and Brazilian investigators with experience in related problems, promising valuable results. ***