This study aimed to compare teaching practice before and after 1998 in Turkey. Participants were 10 academics from the Department of Educational Sciences, Vocational Education Faculty, Gazi University and nine vocational high school cooperating teachers. Semi?structured interviews were analysed by using content analysis. The most significant findings were that the preparation, practice, observation, counselling and evaluation processes were more efficient before 1998 due to the smaller number of preservice teachers. After 1998, the cooperating teachers were legally included in the process (...) and took more responsibility. A new model which combines the positive aspects of both practices is suggested in the article. (shrink)

We present a framework for analyzing black hole backreaction from the point of view of quantum open systems using influence functional formalism. We focus on the model of a black hole described by a radially perturbed quasi-static metric and Hawking radiation by a conformally coupled massless quantum scalar field. It is shown that the closed-time-path (CTP) effective action yields a non-local dissipation term as well as a stochastic noise term in the equation of motion, the Einstein–Langevin equation. Once the thermal (...) Green's function in a Schwarzschild background becomes available to the required accuracy, the strategy described here can be applied to obtain concrete results on backreaction. We also present an alternative derivation of the CTP effective action in terms of the Bogolyubov coefficients, thus making a connection with the interpretation of the noise term as measuring the difference in particle production in alternative histories. (shrink)