U.S.-Venezuela Cooperative Research: Percolation in Two-Dimensional Superconductors

美国-委内瑞拉合作研究：二维超导体的渗流

• 批准号: 8714947
• 负责人: Christopher Lobb
• 金额: $ 0.71万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-03-01 至 1990-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714947&HistoricalAwards=false
• 关键词: U.S.; Venezuela; Cooperative; Research; Percolation

This award will support collaborative research between Prof. Christopher Lobb of Harvard University and Dr. Miguel Octavio of the Instituto Venezolano de Investigaciones Cientificas (IVIC) in Caracas, Venezuela. The objective of the research is to continue present work concerned with theoretical and experimental aspects of percolation theory and superconductivity in random media. Percolation theory serves to unite several seemingly diverse phenomena such as fluid flow in porous media, the strength of composites and ceramics, dielectric breakdown in granular materials, and the electrical properties of superconducting composite wires. Recent theoretical advances have led to an increased understanding of percolation in real materials with generally good agreement between theory and simulations. Work remains to be done in comparing theoretical predictions to measurements on real systems. The researchers intend to perform theoretical work at Harvard, and computer simulations at IVIC. Two types of experiments are currently undertaken and will be continued: at IVIC thin percolative films are being grown and studied in situ, aiming at understanding thin film growth and its effect on superconductivity. At Harvard, artificial random films are being made using electron-beam lithography. Complementary facilities will allow a wide range of experiments to be done. This research has the potential for broad applicability from a fundamental science point of view--the study of transport and breakdown processes in random media--to technological applications such as the strength of composite materials.

该奖项将支持哈佛大学的克里斯托弗·洛布（Christopher Lobb）教授与委内瑞拉加拉加斯委内瑞拉委员会委内瑞拉尼斯委内瑞拉群岛委员会的米格尔·奥克特维奥（Miguel Octavio）博士之间的合作研究。 该研究的目的是继续与随机培养基中渗透理论和超导性的理论和实验方面有关的目前的工作。 渗滤理论可以团结几种看似多样的现象，例如多孔培养基中的流体流动，复合材料和陶瓷的强度，颗粒材料中的介电分解以及超导复合线的电性能。 最新的理论进步导致对真实材料中渗透的理解越来越多，理论和模拟之间的一致性一致。 将理论预测与对实际系统的测量值进行比较，还有待完成工作。 研究人员打算在哈佛大学进行理论工作，并在IVIC进行计算机模拟。 目前正在进行两种类型的实验，并将继续进行：在IVIC薄薄的薄膜原位进行生长和研究，旨在了解薄膜的生长及其对超导性的影响。 在哈佛大学，正在使用电子束光刻制作人造随机膜。 互补的设施将允许进行广泛的实验。 这项研究从基本科学的角度（对随机媒体中的运输和分解过程）进行了广泛的适用性，例如复合材料的强度等技术应用。