Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.
DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.
The minimal a.c. magnetic field which is able to penetrate into the hollow ceramic Y-Ba-Cu-O cylinder was studied experimentally and theoretically as a function of the d.c. magnetic field. The critical state model predicts reversible dependence on the d.c. field in disagreement with observed irreversibility which is explained by interaction between Abrikosov vortices in grains and Josephson vortices in weak links.