'Brick wall' or 'rail switch': the role of low-angle <i>ab</i>-axis grain boundaries in critical current of BSCCO tapes

TEM studies of a Bi-2223 tape have shown that amorphous layers from about 10 nm to more than 100 nm in width were present at c-axis twist boundaries in the highly textured Bi-2223 tape which showed a limited residual weak-link field dependence at low fields (μ₀H<0.1 T) followed by a slow exponential decay at higher fields. This kind of amorphous layer is likely to be insulating, and this strongly suggests that Jc is not limited by c-axis current transport as proposed by the 'brick wall' model. The most frequently observed low-angle grain boundaries are ab-axis grain boundaries containing no (001) planes. A modified 'rail switch' model was proposed with low-angle ab-axis grain boundaries at the switches rather than low-angle c-axis grain boundaries as suggested by Hensel et al

A Structural Model for Evaluating the Sector-specific Impacts of Preferential Trade Agreements

preferential trade agreements, imperfect competition, structural econometrics, AIDS demand model, C51, F13, F14,

Information aggregation and investment cycles with strategic complementarity

Information aggregation, Investment cycles, Coordination games, Strategic complementarity, C73, D82, E32,