Weak Localization Effect in Superconductors by Radiation Damage

Large reductions of the superconducting transition temperature $T_{c}$ and the accompanying loss of the thermal electrical resistivity (electron-phonon interaction) due to radiation damage have been observed for several A15 compounds, Chevrel phase and Ternary superconductors, and $\rm{NbSe_{2}}$ in the high fluence regime. We examine these behaviors based on the recent theory of weak localization effect in superconductors. We find a good fitting to the experimental data. In particular, weak localization correction to the phonon-mediated interaction is derived from the density correlation function. It is shown that weak localization has a strong influence on both the phonon-mediated interaction and the electron-phonon interaction, which leads to the universal correlation of $T_{c}$ and resistance ratio.Comment: 16 pages plus 3 figures, revtex, 76 references, For more information, Plesse see http://www.fen.bilkent.edu.tr/~yjki

"User involvement is a sine qua non, almost, in medical education": Learning with rather than just about health and social care service users

Despite the General Medical Council emphasising the value of service users to medical students' education, there is scant literature about service user involvement in medical education. Although some research has outlined the effectiveness of service users as teachers, none has explored social issues surrounding how medical students learn 'with' rather than just 'about' service users. Incorporating insights from contemporary socio-cultural learning theory, this study examines the views and experiences of 47 stakeholders (comprising 19 service users, 13 medical students and 15 medical educators) concerning service user involvement in medical education. Eight audiotaped focus group discussions were convened and the audiotapes were transcribed. The transcripts and audiotapes were independently analysed by multiple researchers using Framework analysis. Seven content- and five process-orientated themes emerged from the analysis. Content-related themes included the costs and benefits of service user involvement in medical education and process-related themes included the use and function of humour and metaphor. In this paper, we focus primarily on the content-related themes. We discuss these findings in light of the existing service user involvement literature and contemporary socio-cultural learning theory and provide implications for further research and educational practice. We encourage educators to involve service users in medical education but only in a considered way. © 2006 Springer Science+Business Media, Inc