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Ankara : Department of Physics and Institute of Engineering and Science, Bilkent Univ., 1995. Thesis (Master's) -- Bilkent University, 1995. Includes bibliographical references leaves 94-97 The analysis of quantum transport phenomena in small systems is a prominent topic of condensed matter physics due to its numerous technological applications. The current analytical theories are not adequate for studying realistic problems. Computational methods provide the most convenient approaches. Numerical integration of the time-dependent Schrödinger equation is one of the most powerful tools albeit the implementation of the blackbody boundary conditions is problematic. In this work, a novel method which render possible this implementation is described. A number of sample calculations are presented. The method is applied to several one- and two-dimensional systems. A description of the time-dependent behavior of quantum bistable switching is given. Ecemiş, Mustafa Ihsan M.S.

We have found ordering phenomena in the new, tetragonal superconducting material CaBaLaCu3O7–δ using transmission electron microscopy. High-resolution electron microscopy combined with image simulation was used to estimate the occupancy of the cation sites. Using the symmetry and extinctions observed in the electron diffraction patterns, we derive a model explaining the observed phenomena. The model combines oxygen ordering in the CuO planes with lanthanum and barium ordering.

We have found ordering phenomena in the new, tetragonal superconducting material CaBaLaCu3O7–δ using transmission electron microscopy. High-resolution electron microscopy combined with image simulation was used to estimate the occupancy of the cation sites. Using the symmetry and extinctions observed in the electron diffraction patterns, we derive a model explaining the observed phenomena. The model combines oxygen ordering in the CuO planes with lanthanum and barium ordering.