@inproceedings{35401, author = {{Quijada Garrido, Isabel and Siebert, Hartmut and Schmidt, Claudia and Friedrich, Christian}}, booktitle = {{Progress and Trends in Rheology V (5th European Rheology Conference)}}, isbn = {{3-7985-1128-4}}, title = {{{Behavior under flow of side chain liquid crystal polymers}}}, year = {{1998}}, } @inbook{35375, author = {{Schmidt, Claudia and Spiess, Hans Wolfgang}}, booktitle = {{Handbook of Liquid Crystals Set}}, publisher = {{Wiley-VCH Verlag GmbH}}, title = {{{Magnetic Resonance}}}, doi = {{10.1002/9783527619276.ch8aa}}, year = {{1998}}, } @inproceedings{35405, author = {{Schmidt, Claudia and Becker, Patrick and Hasenhindl, Alfred and Müller, Stefan and Siebert, Hartmut}}, booktitle = {{Progress and Trends in Rheology V (5th European Rheology Conference)}}, title = {{{In situ NMR studies of liquid crystals in shear flow}}}, year = {{1998}}, } @inproceedings{35406, author = {{Thiele, T. and Berret, J. F. and Muller, S. and Schmidt, Claudia}}, pages = {{537--538}}, title = {{{Rheology and NMR measurements of sodium dodecyl sulphate/decanol/water nematics}}}, year = {{1998}}, } @book{35019, abstract = {{Der fortschreitende Bewegungsmangel bei Kindern wird in diesem Buch als bedeutendes gesellschaftliches Problem aufgegriffen. Im Mittelpunkt der Arbeit steht deshalb die Frage, wie die Bedingungen der Kindheit im Rahmen bestehender gesellschaftlicher Verhaeltnisse gestaltet sein muessten, um Bewegungsmangelerscheinungen zu verhindern. Hierzu werden basierend auf einer systemtheoretischen Analyse zunaechst die Entstehungsursachen von Bewegungsmangel beleuchtet, um hierauf aufbauend erstens zu begruenden, warum sich insbesondere Tageseinrichtungen fuer Kinder als institutioneller Rahmen fuer Bewegungserziehung eignen. Zweitens wird die strukturelle Vertraeglichkeit des beobachteten Problems mit dem institutionellen Kontext vorschulischer Erziehungseinrichtungen ueberprueft. Ergebnis ist, dass die Bearbeitung des spezifischen Problems nicht mit den vorhandenen systemischen Strukturen korrespondiert. Aus diesem Grund werden drittens Institutionalisierungsmoeglichkeiten einer Bewegungserziehung in Tageseinrichtungen fuer Kinder erlaeutert, indem eine praeventive Bewegungserziehung zur Selbsterziehung eingefordert wird, die fuer das gesamte Erziehungssystem wie auch andere gesellschaftliche Teilsysteme sinnstiftend sein kann. In dem empirischen Teil der Arbeit wird anhand einer Erhebung von 68 Tageseinrichtungen fuer Kinder ueberprueft, inwiefern die strukturellen Rahmenbedingungen der institutionalisierten Vorschulerziehung eine praeventive Bewegungserziehung ermoeglichen. Die Ergebnisse der Untersuchung verschiedener Strukturebenen sowie der Bedeutung, die einer Bewegungserziehung im Vorschulalter beigemessen wird, verweisen auf die besonderen Schwierigkeiten, praeventive Bewegungserziehung in elementarpaedagogischen Institutionen zu etablieren. Abschliessend werden die Ergebnisse der theoretischen und empirischen Untersuchung zum Anlass genommen, Ueberlegungen zur Organisation einer bewegten Kindheit im Hinblick auf die strukturelle Einbindung in der Elementarerziehung zu erlaeutern. Dies geschieht im Rueckgriff auf steuerungstheoretische Ansaetze. Es wird also nach der Moeglichkeit von Strukturaenderungen gefragt, die sich aus der Beratung von und der Intervention in komplexen Sozialsystemen ergeben koennten, um praeventive Bewegungserziehung zur Aufgabe der institutionalisierten Vorschulerziehung werden zu lassen}}, author = {{Meier, Heiko}}, isbn = {{3880203288}}, keywords = {{Bewegungserziehung, Kindergarten, Sportpädagogik, Strukturanalyse, Vorschulerziehung, Soziologie}}, pages = {{156}}, publisher = {{Czwalina}}, title = {{{Organisation einer bewegten Kinderwelt}}}, volume = {{115}}, year = {{1998}}, } @inbook{27947, author = {{Bigga, Regine}}, booktitle = {{Schule und Arbeitswelt. Zwischen Thematisierung und De-Thematisierung von Geschlecht.}}, editor = {{Jansen-Schulz, Bettina}}, pages = {{201--212}}, title = {{{Berufsorientierung in Zeiten der Krise: Thematisierung - Dethematisierung. }}}, year = {{1998}}, } @article{37468, author = {{Bigga, Regine}}, journal = {{Lisa-Jahrbuch}}, location = {{Halle}}, pages = {{150 -- 173}}, publisher = {{Landesinstitut für Lehrerfortbildung, Lehrerweiterbildung und Unterrichtsforschung von Sachsen-Anhalt}}, title = {{{Anregungen für die Lehrplanarbeit hinsichtlich der Gleichstellung der Geschlechter. Lehrpläne für Mädchen und Jungen.}}}, year = {{1998}}, } @article{40641, author = {{Gradzielski, Michael and Kitzerow, Heinz-Siegfried and Hainze, Gürgen and Smie, Andreas and Krischer, Katharina and Blümich, Bernhard and Blümler, P.}}, issn = {{0341-5163}}, journal = {{Nachrichten aus Chemie, Technik und Laboratorium}}, keywords = {{General Medicine}}, number = {{2}}, pages = {{204--220}}, publisher = {{Wiley}}, title = {{{Physikalische Chemie 1997}}}, doi = {{10.1002/nadc.19980460214}}, volume = {{46}}, year = {{1998}}, } @article{40226, author = {{Buey, J. and Díez, L. and Espinet, P. and Kitzerow, Heinz-Siegfried and Miguel, J.A.}}, issn = {{0946-2171}}, journal = {{Applied Physics B: Lasers and Optics}}, keywords = {{General Physics and Astronomy, Physics and Astronomy (miscellaneous), General Engineering}}, number = {{3}}, pages = {{355--358}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Optical storage effect in a platinum orthometalated liquid crystal}}}, doi = {{10.1007/s003400050400}}, volume = {{66}}, year = {{1998}}, } @inproceedings{43335, abstract = {{A microscopic many-body theory is presented which allows one to compute the linear and nonlinear optical properties of semiconductor superlattices in the presence of static and time-dependent electric fields applied in the growth direction. For static fields the Bloch-oscillation dynamics, the role of Coulomb effects, carrier relaxation, phonon scattering, and inter- and intraband polarization dephasing is analyzed. The observability of dynamic localization using optical spectroscopy is discussed for alternating applied fields.}}, author = {{Meier, Torsten and Je, K.-C and Rossi, F. and Hader, J. and Thomas, P. and Koch, S.W.}}, booktitle = {{Ultrafast Phenomena in Semiconductors II}}, pages = {{20--27}}, publisher = {{SPIE}}, title = {{{Coherent electric-field effects in semiconductors}}}, doi = {{10.1117/12.306150}}, volume = {{3277}}, year = {{1998}}, } @article{43338, abstract = {{A theory for four-wave-mixing signals from molecular aggregates, which includes effects of two-exciton states, static disorder, and coupling to a phonon bath with an arbitrary spectral density, is developed. The third-order polarization is rigorously partitioned into a coherent and a sequential contribution. The latter is given by a sum of an exciton-hopping and a ground state (bleaching) terms, both expressed using the doorway-window representation. Applications are made to photon-echo and pump-probe spectroscopies of the B850 system of the LH2 antenna in purple bacteria.}}, author = {{Meier, Torsten and Zhang, W.M. and Chernyak, V. and Mukamel, S.}}, journal = {{The Journal of chemical physics}}, number = {{18}}, pages = {{7763--7774}}, publisher = {{American Institute of Physics}}, title = {{{Exciton-Migration and Three-Pulse Femtosecond Optical Spectroscopies of Photosynthetic Antenna Complexes}}}, doi = {{10.1063/1.476212}}, volume = {{108}}, year = {{1998}}, } @article{43337, abstract = {{Femtosecond spectroscopies of chlorophyll dimers and the LH2 antenna complex are calculated using a theory that incorporates the effects of two–exciton states, static disorder and coupling of excitons to phonons with an arbitrary spectral density. Applications are made to pump–probe and echo peak–shift measurements in the B820 dimers, and to fluorescence depolarization in the B850 system of the LH2 antenna of purple bacteria.}}, author = {{Meier, Torsten and Zhang, W.M. and Chernyak, V. and Mukamel, S.}}, journal = {{Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences}}, number = {{1736}}, pages = {{405--419}}, publisher = {{The Royal Society}}, title = {{{Simulation of Three-Pulse-Echo and Fluorescence Depolarization in Photosynthetic Aggregates}}}, doi = {{10.1098/rsta.1998.0173}}, volume = {{356}}, year = {{1998}}, } @article{43336, abstract = {{We investigate the nonlinear dynamics of the composite absorber-cavity system by performing femtosecond time-resolved four-wave mixing experiments on a semiconductor microcavity. The nonlinear response exhibits an unexpected temporal behavior that distinctively differs from that of other multilevel systems. Accompanying model calculations show that the observed behavior is a direct consequence of the mixed electron-photon character of the absorber-cavity system.}}, author = {{Meier, Torsten and Koch, M. and Shah, J.}}, journal = {{Physical Review B}}, number = {{4}}, pages = {{2049--2052}}, publisher = {{American Physical Society}}, title = {{{Coupled absorber-cavity system: Observation of a characteristic nonlinear response}}}, doi = {{10.1103/PhysRevB.57.R2049}}, volume = {{57}}, year = {{1998}}, } @article{43339, author = {{Meier, Torsten and Thomas, P. and Koch, S.W.}}, journal = {{Physics of Low-Dimensional Structures (PLDS)}}, number = {{3-4}}, pages = {{1--44}}, title = {{{Coherent Effects in Photoexcited Semiconductor Superlattices with Electric Fields}}}, volume = {{1998}}, year = {{1998}}, } @article{26009, abstract = {{Lamellar mesostructured aluminophosphates were synthesized from aluminum triisopropoxide and phosphoric acid; monododecyl phosphate surfactant was used as structure-directing template. Depending on the relative Al/P ratio in the samples, variable relative amounts of tetrahedrally and octahedrally coordinated Al are found, indicating that both aluminophosphate and aluminum oxide species (as thermodynamically favored) are being formed in the syntheses. This is investigated quantitatively by Al K-edge XANES spectroscopy. The same syntheses were carried out without phosphoric acid, resulting in similar lamellar structures. The inorganic lamellae of these products consist to a significant extent of aluminophosphate rather than exclusively of aluminum oxide, which means that the phosphate headgroups of the surfactant molecules become incorporated into the inorganic network. Thus, for the first time, the surfactant serves as both template and reactant.}}, author = {{Fröba, Michael and Tiemann, Michael}}, issn = {{0897-4756}}, journal = {{Chemistry of Materials}}, pages = {{3475--3483}}, title = {{{A New Role of the Surfactant in the Synthesis of Mesostructured Phases:  Dodecyl Phosphate as Template and Reactant for Aluminophosphates}}}, doi = {{10.1021/cm980712c}}, year = {{1998}}, } @article{43340, abstract = {{Femtosecond two beam and three beam ( ω1,ω1;ω2) four-wave mixing (FWM) experiments on GaAs quantum wells have been performed using two partially synchronized, independently tunable lasers with external jitter compensation. Heavy and light hole beatings are observed with these two mutually incoherent lasers. FWM signals are observed when ω2 is completely below the exciton energies, with no spectral overlap with the absorption profile. These off-resonant signals are stronger than the interband continuum signals for equivalent detunings.}}, author = {{Meier, Torsten and Kim, D.S. and Sohn, J.Y. and Yahng, J.S. and Ahn, Y. H. and Yee, K.J. and Yee, D.S. and Cho, Y.D. and Hong, S.C. and Kim, W.S. and Woo, J.C. and Koch, S.W. and Woo, D.H. and Kim, E. K. and Kim , S.H. and Kim, C.S.}}, journal = {{Physical review letters}}, number = {{21}}, pages = {{4803--4806}}, publisher = {{American Physical Society}}, title = {{{Femtosecond four-wave mixing experiments on GaAs quantum wells using two independently tunable lasers}}}, doi = {{10.1103/PhysRevLett.80.4803}}, volume = {{80}}, year = {{1998}}, } @article{43341, abstract = {{Closed Green-function expressions for the third-order response of semiconductors are derived by mapping the two-band model onto the much simpler molecular (Frenkel) Hamiltonian. The signatures of two-exciton resonances are incorporated through the exciton scattering matrix, totally avoiding the explicit calculation of two-exciton states. Exact expressions for the nonlinear optical response of two-dimensional semiconductor nanostructures in a strong perpendicular magnetic field are derived by truncating at the n=1 Landau level, and using the symmetry of the system and a group-theoretical analysis. We find that the nonlinear optical response depends crucially on asymmetries between particle-particle and particle-hole Coulomb interactions.}}, author = {{Meier, Torsten and Chernyak, V. and Yokojima, S. and Mukamel, S.}}, journal = {{Physical Review B}}, number = {{8}}, pages = {{4496--4516}}, publisher = {{American Physical Society}}, title = {{{Effective Frenkel Hamiltonian for optical nonlinearities in semiconductors: Application to magnetoexcitons}}}, doi = {{10.1103/PhysRevB.58.4496}}, volume = {{58}}, year = {{1998}}, } @article{43343, abstract = {{In his Comment on our work Glutsch raises, on the basis of a calculation for a dimerized three-dimensional superlattice, four points: (1) odd-parity excitons do not contribute to optical absorption, (2) there are no forbidden single-particle transitions, (3) there is a coupling of the e1-hh2 exciton (called ¯X in Ref. 1) to the underlying e1-hh1 continuum that leads to a Fano resonance, and (4) the extension of the exciton wave function is infinite in an all space directions rather than having a small extension. In this Reply these four points are addressed and it is shown that our previous conclusions remain valid.}}, author = {{Meier, Torsten and Bott, K. and Hader, J. and Brinkmann, D. and Koch, S.W. and Thomas, P.}}, journal = {{Physical Review B}}, number = {{23}}, publisher = {{American Physical Society}}, title = {{{Reply to Comment on "Odd-parity excitons in semiconductor superlattices"}}}, doi = {{10.1103/PhysRevB.58.15911}}, volume = {{58}}, year = {{1998}}, } @article{43344, abstract = {{Absorption and differential electroabsorption spectra of a GaInAs/InP superlattice in the regime of Wannier–Stark localization are compared with spectra derived from the Semiconductors Bloch Equations. The absorption is strongly underestimated for higher energies by the effective mass approximation but good agreement is achieved by using an energy dependent in-plane effective mass. No fitting parameters are used except for a phenomenological broadening. The lineshape of the field-modulated spectra is dominated by the strong field dependence of Wannier–Stark transitions and depends on the amplitude of the modulating field which should be kept small for best results. REFERENCES}}, author = {{Meier, Torsten and Thränhardt, A. and Kolbe, H.J. and Hader, J. and Weiser, G. and Koch, S.W.}}, journal = {{Applied Physics Letters}}, number = {{18}}, pages = {{2612--2614}}, publisher = {{American Institute of Physics}}, title = {{{Field-dependent absorption in superlattices: Comparison of theory and experiment}}}, doi = {{10.1063/1.122522}}, volume = {{73}}, year = {{1998}}, } @article{43342, abstract = {{The four-wave mixing (FWM) signal of a semiconductor superlattice with an external electric field is evaluated using the semiconductor Bloch equations. It is found that the FWM signal for a GaAs/AlGaAs-semiconductor superlattices with a lattice constant d has a deep valley when the electric field is around eF d = 1 meV. It is also found that the deep valley comes mainly from the broken inversion symmetry caused by the exteral electric field and that the field intensity determines the sign and the magnitude of the Coulomb-induced optical nonlinearities.}}, author = {{Meier, Torsten and Je, K.-C and Kim, Y. and Koch, S.W.}}, journal = {{Journal of the Korean Physical Society}}, number = {{4}}, pages = {{437--440}}, title = {{{Field-Induced Four-Wave Mixing Signal in Semiconductor Superlattices}}}, volume = {{32}}, year = {{1998}}, }