A generalized version of the Callen-Welton fluctuation-dissipation formula that is nonlocal in space and time is derived. In a nonuniform plasma there appear significant differences between the fluctuations of the electrostatic field and those of the electron density, and the spatial inhomogeneities lead to an asymmetry with respect to the sign inversion of the frequency.

Abstract The present study was an attempt to investigate the relationship between EFL learners’ anxiety and writing complexity. For the purpose of the study, 70 female learners, between 17 and 24 years old (mean=20) from Najm language school in Tehran participated in the study. The participants’ level of anxiety was measured using Horwitz, Horwitz, and Cope’s Anxiety Questionnaire (1986) and th...

• Prof. James D. Callen, University of Wisconsin, Madison, WI, USA • Dr. Geoffrey Cordey, JET, Abingdon, UK • Dr. Otto Gruber, ASDEX U, Max Planck Institut, Garching bei Muenchen, Germany • Prof. Wendell Horton, IFS, University of Texas at Austin, TX, USA • Dr. Jean Jacquinot, Director of JET, Abingdon, UK (now Director of DRFC, C.E.A., Cadarache, France) • Prof. Guy Laval, Chairman, Ecole Poly...