Phase Transitions and Fluctuations in Mesoscopic Systems

In this talk some interesting and up-to-date problems will be mentioned, which are opened recently to more extended and detailed fundamental studies. These are static and dynamical problems of meso-scale physics, and other fields like neural networks or financial markets, where dynamic, nonlinear fluctuations are dominant, new phenomena like stochastic resonances or phase synchronization occur. It is not excluded that these activities will lead to qualitative progress in the field of diagnostics, energetics and laws of signal and noise in fluctuating mesoscopic systems.