@article{13684, author = {{Letzig, T. and Willig, F. and Hahn, P. H. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{24}}, title = {{{Experimental and theoretical evidence for a hydrogen stabilizedc(2×2)reconstruction of the P-rich InP(001) surface}}}, doi = {{10.1103/physrevb.74.245307}}, volume = {{74}}, year = {{2006}}, } @article{13691, author = {{Biering, S. and Hermann, A. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{23}}, title = {{{Adsorption of water on chlorine-terminated Si(111) from first principles: Substrate-induced ordering versus intermolecular interactions}}}, doi = {{10.1103/physrevb.73.235429}}, volume = {{73}}, year = {{2006}}, } @article{13690, author = {{Thierfelder, C. and Hermann, A. and Schwerdtfeger, P. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{4}}, title = {{{Strongly bonded water monomers on the ice Ih basal plane: Density-functional calculations}}}, doi = {{10.1103/physrevb.74.045422}}, volume = {{74}}, year = {{2006}}, } @article{13694, author = {{Seino, K. and Schmidt, Wolf Gero and Ohtake, A.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{3}}, title = {{{Ga-richGaAs(001)surface fromab initiocalculations: Atomic structure of the(4×6)and(6×6)reconstructions}}}, doi = {{10.1103/physrevb.73.035317}}, volume = {{73}}, year = {{2006}}, } @article{13692, author = {{Schmidt, Wolf Gero and Hermann, A. and Fuchs, F. and Bechstedt, F.}}, issn = {{1567-1739}}, journal = {{Current Applied Physics}}, pages = {{525--530}}, title = {{{Si(001) surface optical anisotropies induced by π-conjugated overlayers and oxidation}}}, doi = {{10.1016/j.cap.2005.11.069}}, volume = {{6}}, year = {{2006}}, } @article{13695, author = {{Hahn, P. H. and Schmidt, Wolf Gero and Bechstedt, F.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{24}}, title = {{{Molecular electronic excitations calculated from a solid-state approach: Methodology and numerics}}}, doi = {{10.1103/physrevb.72.245425}}, volume = {{72}}, year = {{2006}}, } @article{13693, author = {{Schmidt, Wolf Gero and Seino, K.}}, issn = {{1567-1739}}, journal = {{Current Applied Physics}}, pages = {{331--333}}, title = {{{Si(001) c(4×2)–p(2×2) surface phase transitions induced by electric fields and doping}}}, doi = {{10.1016/j.cap.2005.11.012}}, volume = {{6}}, year = {{2006}}, } @article{13845, author = {{Ortmann, F. and Bechstedt, F. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{20}}, title = {{{Semiempirical van der Waals correction to the density functional description of solids and molecular structures}}}, doi = {{10.1103/physrevb.73.205101}}, volume = {{73}}, year = {{2006}}, } @article{15848, author = {{Schulz, S. and Schumacher, Stefan and Czycholl, G.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{Tight-binding model for semiconductor quantum dots with a wurtzite crystal structure: From one-particle properties to Coulomb correlations and optical spectra}}}, doi = {{10.1103/physrevb.73.245327}}, year = {{2006}}, } @inproceedings{4191, abstract = {{We study optical second-harmonic generation from planar arrays of magnetic split-ring resonators at 1.5 microns resonance wavelength. We obtain by far the largest signals when exciting the magnetic-dipole resonance. }}, author = {{Klein, Matthias W. and Enkrich, Christian and Wegener, Martin and Förstner, Jens and Moloney, Jerome V. and Hoyer, Walter and Stroucken, Tineke and Meier, Torsten and Koch, Stephan W. and Linden, Stefan}}, booktitle = {{Photonic Metamaterials: From Random to Periodic}}, isbn = {{155752808X}}, keywords = {{tet_topic_meta}}, publisher = {{OSA}}, title = {{{Optical Experiments on Second-Harmonic Generation with Metamaterials Composed of Split-Ring Resonators}}}, doi = {{10.1364/meta.2006.tuc5}}, year = {{2006}}, } @article{50618, author = {{Aschhoff, Stefanie}}, journal = {{Sonderpädagogik in Niedersachsen. Zeitschrift des vds-Landesverbandes Niedersachsen}}, pages = {{38–51}}, title = {{{Förderung sozialer Kompetenzen von Schülerinnen und Schülern mit dem Förderschwerpunkt Lernen durch eine Streitschlichterausbildung}}}, volume = {{2}}, year = {{2006}}, } @article{50619, author = {{Aschhoff, Stefanie and Voigt, Ulrich}}, journal = {{Zeitschrift für Heilpädagogik}}, pages = {{88–93}}, title = {{{Das Freizeitverhalten von Schülerinnen und Schülern mit den Förderschwerpunkten Lernen und emotionale und soziale Entwicklung in der Selbst- und Fremdwahrnehmung}}}, volume = {{57}}, year = {{2006}}, } @misc{52642, author = {{Wallaschek, J. and Hemsel, Tobias and Mracek, M.}}, isbn = {{3-935433-89-1}}, title = {{{Proceedings of the 2nd International Workshop on Piezoelectric Materials and Applications in Acutators}}}, volume = {{Band 180}}, year = {{2005}}, } @phdthesis{52641, author = {{Balážová, M.}}, isbn = {{3-935433-83-2}}, title = {{{Methode zur Leistungsbewertung und Leistungssteigerung der Mechatronikentwicklung }}}, volume = {{Band 174}}, year = {{2005}}, } @phdthesis{25537, author = {{Kriesel, Clemens}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Szenarioorientierte Unternehmensstrukturoptimierung - Strategische Standort- und Produktionsplanung}}}, volume = {{185}}, year = {{2005}}, } @article{23496, abstract = {{The optical and electronic properties of semiconductor heterostructures in the vicinity of photonic crystals are discussed. The theoretical approach provides a self-consistent solution of the dynamics of the electromagnetic field and the material excitations. Due to the influence of the structured dielectric environment on the Coulomb interaction, the exciton resonances and the quasiequilibrium carrier densities in the spatially homogeneous semiconductor become space dependent. It is demonstrated that these inhomogeneities lead to distinct modifications of the optical absorption and gain spectra. As an application, numerically calculated density-dependent optical spectra are analyzed for an array of semiconductor quantum wires which are close to a two-dimensional photonic crystal. The spatial inhomogeneities result in novel excitonic absorption features and modification of the optical gain in these structures.}}, author = {{Reichelt, Matthias and Pasenow, B. and Meier, Torsten and Stroucken, T. and Koch, S. W.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{3}}, title = {{{Spatially inhomogeneous optical gain in semiconductor photonic-crystal structures}}}, doi = {{10.1103/physrevb.71.035346}}, volume = {{71}}, year = {{2005}}, } @article{23498, abstract = {{The ultrafast dynamics of photoexcitations at silicon surfaces is investigated using a surface-sensitive purely optical technique. In the experiments, the diffracted second harmonic generated by sequences of ultrashort laser pulses is detected as a function of the time delay between the pulses. It is demonstrated that this five-wave-mixing technique can be used to measure the temporal evolution of the optical polarization and the photoexcited populations at the surface. The experimental results can be reproduced by numerical solutions of optical Bloch equations. The theoretical analysis allows one to investigate which dephasing times and relaxation processes are compatible with experiment. Furthermore, it is outlined how one can describe optical nonlinearities at surfaces using a microscopic theory within the framework of semiconductor Bloch equations.}}, author = {{Meier, Torsten and Reichelt, Matthias and Koch, S W and Höfer, U}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{8}}, pages = {{S221--S244}}, title = {{{Femtosecond time-resolved five-wave mixing at silicon surfaces}}}, doi = {{10.1088/0953-8984/17/8/003}}, volume = {{17}}, year = {{2005}}, } @article{58598, abstract = {{AbstractA series of bis‐guanidine ligands designed for use in biomimetic coordination chemistry has been extended to a library matrix combining unprecedented substitutional flexibility within the guanidyl residues with a wide range of aliphatic and aromatic spacers connecting these functionalities. The underlying protocol can be used with predefined ureas as well as secondary amines to build up these units by reaction with phosgene if the ureas are otherwise unavailable. In the latter case, the resulting urea intermediates do not have to be isolated as the reaction proceeds further with additional phosgene to yield a chloroformamidinium chloride which is transformed into the bis‐guanidine functionality by subsequent reaction with a suitable primary diamine in the presence of triethylamine as an auxiliary base. This concept has been used to synthesise and characterise more then two dozen different bis‐guanidines based on 12 discrete monoguanidine units and seven different spacers. These spacers have been chosen such that the most important phenotypes have been dealt with and which range from rigid to more flexible scaffolds. In addition to spacers with no metal‐binding capabilities, other species containing further donor functions such as N‐methyldiphenyleneamine or pyridine‐2,6‐diyl have also been used. The substitution patterns of the guanidine residues can be classified into acyclic and cyclic types. Among the cyclic types, one subset is characterised by five‐ or six‐membered heterocycles containing both the amino nitrogen atoms and another one by individual N‐heterocyclic systems for each amino nitrogen. Structurally characterised examples are 2‐{2‐[2‐(tetramethylguanidi­no)ethoxy]ethoxy}‐1‐(tetramethylguanidino)ethane (TMG2doo) in its diprotonated form and 2,2′‐bis[2N‐(1,1′,3,3′‐tetramethylguanidine)]diphenyleneamine (TMG2PA) as wellas N1,N3‐bis(dimorpholinomethylene)propane‐1,3‐diamine (DMorphG2p) as free bases. For the permethylated bis‐guanidine derivatives, the barrier to rotation around the (C=N)guanidine bond has been determined by means of temperature‐dependent EXSY 1H NMR spectroscopy to range between 54 and 79 kJ mol–1 depending on the type of spacer. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)}}, author = {{Herres‐Pawlis, Sonja and Neuba, Adam and Seewald, Oliver and Seshadri, Tarimala and Egold, Hans and Flörke, Ulrich and Henkel, Gerald}}, issn = {{1434-193X}}, journal = {{European Journal of Organic Chemistry}}, number = {{22}}, pages = {{4879--4890}}, publisher = {{Wiley}}, title = {{{A Library of Peralkylated Bis‐guanidine Ligands for Use in Biomimetic Coordination Chemistry}}}, doi = {{10.1002/ejoc.200500340}}, volume = {{2005}}, year = {{2005}}, } @article{58597, abstract = {{AbstractSyntheses and Structure of Chiral Metallatetrahedron Complexes of the Type [Re2(M1PPh3)(M2PPh3)(μ‐PCy2)(CO)7C≡CPh] (M1 = Ag, Au; M2 = Cu, Ag, Au)From the reaction of Li[Re2(μ‐H)(μ‐PCy2)(CO)7(C(Ph)O)] (1) with Ph3AuC≡CPh both benzaldehyde and the trinuclear complex Li[Re2(AuPPh3)(μ‐PCy2)(CO)7C≡CPh] (2a) were obtained in high yield. The complex anion was isolated as its PPh4‐salt 2b. The latter reacts with coinage metal complexes PPh3M2Cl [M2 = Cu, Ag, Au] to give chiral heterometallatetrahedranes of the general formula [Re2(AuPPh3)(M2PPh3)(μ‐PCy2)(CO)7C≡CPh] (M2 = Cu 3a, Ag 3b, Au 3c). The corresponding complex [Re2(AgPPh3)2(μ‐PCy2)(CO)7C≡CPh] (3d) is obtained from the reaction of [Re2(AgPPh3)2(μ‐PCy2)(CO)7Cl] (4) with LiC≡CPh. 3d undergoes a metathesis reaction in the presence of PPh3CuCl giving [Re2(AgPPh3)(CuPPh3)(μ‐PCy2)(CO)7C≡CPh] (3e) and PPh3AgCl. Analogous metathesis reactions are observed when 3c is reacted with PPh3AgCl or PPh3CuCl giving 3a or 3b, respectively. The reaction of 1 with PPh3AuCl gives benzaldehyde and Li[Re2(AuPPh3)(μ‐PCy2)(CO)7Cl] (5a) which upon reaction with PhLi forms the trinuclear complex Li[Re2(AuPPh3)(μ‐PCy2)(CO)7Ph] (6a). Again this complex was isolated as its PPh4‐salt 6b. In contrast to 2b, 6b reacts with one equivalent of Ph3PAuCl by transmetalation to give Ph3PAuPh and PPh4[Re2(AuPPh3)(μ‐PCy2)(CO)7Cl] (5b). The X‐ray structures of the compounds 3a, 3b, 3e and 4 are reported.}}, author = {{Seewald, Oliver and Flörke, Ulrich and Egold, Hans and Haupt, Hans‐Jürgen and Schwefer, Meinhard}}, issn = {{0044-2313}}, journal = {{Zeitschrift für anorganische und allgemeine Chemie}}, number = {{2}}, pages = {{204--210}}, publisher = {{Wiley}}, title = {{{Synthese und Struktur chiraler Heterometallatetrahedrane des Typs [Re2(M1PPh3)(M2PPh3)(μ‐PCy2)(CO)7C≡CPh] (M1 = Ag, Au; M2 = Cu, Ag, Au)}}}, doi = {{10.1002/zaac.200500340}}, volume = {{632}}, year = {{2005}}, } @article{13709, author = {{Hahn, P. H. and Schmidt, Wolf Gero and Seino, K. and Preuss, M. and Bechstedt, F. and Bernholc, J.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, pages = {{037404}}, title = {{{Optical Absorption of Water: Coulomb Effects versus Hydrogen Bonding}}}, doi = {{10.1103/physrevlett.94.037404}}, volume = {{94}}, year = {{2005}}, }