Giant proximity effect in a phase-fluctuating superconductor

When a tunneling barrier between two superconductors is formed by a normal material that would be a superconductor in the absence of phase fluctuations, the resulting Josephson effect can undergo an enormous enhancement. We establish this novel proximity effect by a general argument as well as a numerical simulation and argue that it may underlie recent experimental observations of the giant proximity effect between two cuprate superconductors separated by a barrier made of the same material rendered normal by severe underdoping.Comment: 4 pages, 3 figures; version to appear in PRL (results of simulations in 3d added). For related work and info visit http://www.physics.ubc.ca/~fran

Effect of Out-Gassing on the Onset of Hypersonic Boundary Layer Transition

Prediction and control of the onset of transition and the associated variation in aerothermodynamic parameters in high-speed flows is key to optimize the performance and design of Thermal Protection Systems (TPS) of next-generation aerospace vehicles [1]. Boundary Layer Transition (BLT) characteristics can influence the surface heating budget determining the TPS thickness and consequently its weight penalty. Ablative heatshields are designed to alleviate the high heat flux at the surface through pyrolysis of their polymeric matrix and subsequent fiber ablation [2]. Pyrolysis leads to out-gassing and non-uniform ablation lead to surface roughness, both of which are known to influence the transition process. An ablator impacts BLT through three main routes: gas injecting into the boundary layer from the wall, changing the surface heat transfer due to wall-flow chemical reactions, and modifying surface roughness [3]. In preparation to Mars 2020 mission post-flight analysis, the predictive transition capability has been initiated toward hard-coupling porous material response analysis and aerothermal environment calculation

Editor\u27s Note: Outreach and Advocacy During Economic Recession

Editor\u27s introduction for The Primary Source, Vol. 28, No. 2

Editor\u27s Note - Hidden Potential: Revealing the Hidden Collection in Your Archives

Editor\u27s introduction to The Primary Source, Vol. 31, No. 1

Collective identification in arab american emerging adults: does affirmation to ethnic, national, family and religious groups predict positive adjustment?

There has been little work investigating multiple social identities, though an individual can identify with several groups (Kiang, Yip, & Fuligni, 2008). The aim of this study is to investigate the relationships among theoretically significant ingroup identifications and their contributions to adjustment in Arab American emerging adults. The Inclusion of the Ingroup in Self (IIS) measure and the Multigroup Ethnic Identity Measure - Revised (MEIM-R) were adapted to measure affirmation to ethnic, national (American), family, and religious groups. The results indicate that a pure model of pure affirmation could not be supported - it may be important to consider exploration behaviors. Results also indicated that individuals highly identified with ethnic, national (American), family, and religious groups report higher self-esteem and positive affect, as well as better relationships with parents. Regressions indicate that only religious identity predicted significant variance in positive affect, self-esteem, and ego competence. In addition, evidence was found for a mediating role of religious identity between ethnic identity and ego competence. Implications for positive youth development are discussed

Editor\u27s Note: Web 2.0 in the Archive World

Editor\u27s introduction to The Primary Source, Vol. 30

Editor\u27s Note - On the Map: The Function, Use, and Preservation of Maps in Archives

Editor\u27s introduction for The Primary Source, Vol. 31, No. 2