@article{SchmidtZamoraLopezKurths2010, author = {Schmidt, G. and Zamora-Lopez, Gorka and Kurths, J{\"u}rgen}, title = {Simulation of large scale cortical networks by individual neuron dynamics}, issn = {0218-1274}, doi = {10.1142/S0218127410026149}, year = {2010}, abstract = {Understanding the functional dynamics of the mammalian brain is one of the central aims of modern neuroscience. Mathematical modeling and computational simulations of neural networks can help in this quest. In recent publications, a multilevel model has been presented to simulate the resting-state dynamics of the cortico-cortical connectivity of the mammalian brain. In the present work we investigate how much of the dynamical behavior of the multilevel model can be reproduced by a strongly simplified model. We find that replacing each cortical area by a single Rulkov map recreates the patterns of dynamical correlation of the multilevel model, while the outcome of other models and setups mainly depends on the local network properties, e. g. the input degree of each vertex. In general, we find that a simple simulation whose dynamics depends on the global topology of the whole network is far from trivial. A systematic analysis of different dynamical models and coupling setups is required.}, language = {en} } @article{RaderFauthGouldetal.2005, author = {Rader, Oliver and Fauth, K. and Gould, C. and Ruster, C. and Schott, G. M. and Schmidt, G. and Brunner, K. and Molenkamp, Laurens W. and Schutz, G. and Kronast, F. and Durr, H. A. and Eberhardt, W. and Gudat, Wolfgang}, title = {Identification of extrinsic Mn contributions in Ga1-xMnxAs by field-dependent magnetic circular X-ray dichroism}, issn = {0368-2048}, year = {2005}, abstract = {We combine sensitivity to atomic number, chemical shifts, probing depth, and magnetic order in a field- dependent magnetic circular X-ray dichroism study at the Mn L-edge of the diluted ferromagnetic semiconductor Ga1-xMnxAs and observe different Mn constituents: ferromagnetic Mn with an n(d) > 5 lineshape and paramagnetic Mn with distinct n(d) = 5 lineshape. The paramagnetic Mn is assigned to interstitials with surface segregation tendency. (c) 2005 Elsevier B.V. All rights reserved}, language = {en} } @misc{LaschewskyRingsdorfSchmidtetal.1987, author = {Laschewsky, Andr{\´e} and Ringsdorf, H. and Schmidt, G. and Schneider, J.}, title = {Self-organization of polymeric lipids with hydrophilic spacers in side groups and main chain : investigation in monolayers and multilayers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17147}, year = {1987}, abstract = {Several polymerizable lipids were synthesized and polymerized to amphiphilic homopolymers and to copolymers with the help of hydrophilic comonomers. The self-organization of these polymeric lipids was investigated in monolayers and Langmuir-Blodgett multilayers. The self-organization of these polymers in model membranes is due to hydrophilic spacer groups in the amphiphilic side groups as well as to hydrophilic spacer groups in the polymer backbone. Thus, highly ordered monolayers and LB-multilayers are easily obtained.}, language = {en} } @misc{LaschewskyRingsdorfSchmidt1985, author = {Laschewsky, Andr{\´e} and Ringsdorf, H. and Schmidt, G.}, title = {Polymerization of hydrocarbon and fluorocarbon amphiphiles in Langmuir-Blodgett multilayers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17096}, year = {1985}, abstract = {Langmuir-Blodgett multilayers of polymerizable carboxylic acids with hydrocarbon or fluorocarbon chains were prepared. The multilayers were polymerized by UV light and the reactions were studied by UV/visible spectroscopy. The polyreactions strongly influence the multilayer structures which were investigated by X-ray small-angle scattering and scanning electron microscopy. The spreading behaviour of the monomers, the preparation of multilayers, their reactivities in multilayers and structural effects caused by the polyreactions are discussed with regard to the hydrophilic head groups, the polymerizable groups and the hydrophobic chains.}, language = {en} }