Superfluid Dynamics and Critical Phenomena

小行星9623694 三个主题将继续说明不同方面的超流体物理条件下的混乱：1。液态氦在多孔（Vycor）玻璃中的超流转变，特别是在转变时热容异常的测量-这需要低温量热技术的重大进步2。多孔介质中的耗散超流。该系统作为一个玻色子模拟的高温超导体，其中的涡旋流体和磁通流的理解是技术上的重要。 3.在吸附在石墨上的4 He的第二层中发现的超流相-这是一个需要进一步研究的独特相。 超流氦被用来阐明凝聚态物理中普遍感兴趣的问题。杂质和结构缺陷对“临界现象”和其他性质的影响将被检查。研究多孔介质中的液氦，其中结构充当“淬火杂质”，可以为理解凝聚态系统中的无序的基本问题提供有价值的见解和测试。 ***

9623694 Reppy Threee topics will be pursued which illustrate different aspects of superfluid physics under conditions of disorder: 1. The superfluid transition of liquid helium in porous (Vycor) glass, specifically a measurement of the heat capacity anomaly at the transition - for which a major advance in the art of low-temperature calorimetry will be required 2. Dissipative superflow in porous media. The system serves as a boson analog of a high-Tc superconductor, in which the understanding of the vortex fluid and the flux flow is of technically important. 3. The superfluid phase found in the second layer of 4He adsorbed on graphite - a unique phase that calls for further investigation. %%% Superfluid helium is employed to illuminate problems of general interest in condensed-matter physics. The effect of impurities and structural defects on "critical phenomena" and other properties will be examined. The study of liquid helium contained in a porous medium, where the structure acts as a "quenched impurity", can provide valuable insights and tests for understanding the fundamental problem of disorder in condensed-matter systems. ***