@article{43334, abstract = {{A microscopic theory is applied to discuss coherent excitation effects in semiconductors. The theory is evaluated to analyze ultrafast absorption changes around the exciton resonance in semiconductor quantum-well structures where the relative strength of the different many-body contributions can be manipulated by proper selection of pump and probe polarizations. For two-band systems and oppositely circular polarization it is shown that Coulombic correlation dynamics dominates the optical response. As a consequence, the optical Stark effect in this configuration corresponds to a red shift of the exciton resonance in striking contrast to the usual atomic-like blue shift. The predictions are confirmed by experiments using high-quality InGaAs quantum-well systems.}}, author = {{Meier, Torsten and Koch, S.W. and Sieh, C. and Jahnke, F. and Knorr, A. and Brick, P. and Hübner, M. and Ell, C. and Prineas, J. and Khitrova , G. and Gibbs, H.M.}}, journal = {{Journal of luminescence}}, pages = {{1--6}}, publisher = {{Journal of luminescence}}, title = {{{Theory of coherent effects in semiconductors}}}, doi = {{10.1016/S0022-2313(99)00065-4}}, volume = {{83/84}}, year = {{1999}}, } @inbook{45217, author = {{Herzig, Bardo and Tulodziecki, G.}}, booktitle = {{Einblicke – Ausblicke. 25 Jahre Universität Paderborn}}, editor = {{Fisch, E. and Vollmer, H.}}, pages = {{103--112}}, publisher = {{Bonifatius Druck}}, title = {{{Neue Medien – welchen Beitrag können sie für schulische Innovationen leisten? }}}, year = {{1999}}, } @article{45218, author = {{Blanck, B. and Herzig, Bardo and Loh, W.}}, journal = {{Streitforum für Erwägungskultur EuS 10(1999)1}}, pages = {{144--151}}, title = {{{Metakritik als Erforschung des vielfältigen Umgangs mit Vielfalt. Ethik und Sozialwissenschaften}}}, year = {{1999}}, } @article{17508, author = {{Peckhaus, Volker}}, journal = {{Philosophia Scientiae (Nancy) 3 (4) (1998/1999), special issue: Un logicien consciencieux. La philosophie de Evert Willem Beth}}, pages = {{151--173}}, title = {{{Moral Integrity during a Difficult Period: Beth and Scholz}}}, year = {{1999}}, } @book{44832, author = {{Freitag, Christine and Fiegert, Monika}}, pages = {{219}}, publisher = {{Fromm}}, title = {{{„…des Morgens Bäthet der Lehrer zu erst.“ Eine kommentierte Quellensammlung zur Geschichte des ländlichen Schulwesens im Osnabrücker Raum 1690-1865, hrsg. vom Landkreis Osnabrück}}}, volume = {{10}}, year = {{1999}}, } @inbook{44831, author = {{Freitag, Christine}}, booktitle = {{Wege zur Mündigkeit – Herausforderungen pädagogischer Professionalisierung}}, editor = {{Freitag, Christine and Solzbacher, Claudia}}, isbn = {{3-932147-67-7}}, pages = {{202--211}}, publisher = {{Rasch}}, title = {{{Maisons Familiales Rurales und Escuelas de la Familia Agrícola – Universalisierung eines Regionalisierungskonzepts?}}}, year = {{1999}}, } @book{44834, editor = {{Freitag, Christine and Solzbacher, Claudia}}, isbn = {{3-932147-67-7}}, pages = {{230}}, publisher = {{Rasch}}, title = {{{Wege zur Mündigkeit – Herausforderungen pädagogischer Professionalisierung}}}, year = {{1999}}, } @article{13765, abstract = {{ We calculate the reflectance anisotropy for GaP(001)(2×4) surfaces using a real-space multigrid method and ab initio pseudopotentials. Our results obtained within DFT-LDA show good qualitative agreement with recent experiments. This holds in particular for the stoichiometric trends. A strong negative anisotropy at low photon energies is linked to the formation of Ga–Ga bonds along the [110] direction. There are discrepancies, however, with respect to the line shape and the energetic positions of characteristic peaks. Substantial improvement is achieved by using a numerically efficient GW approach with approximations for local-field effects and dynamical screening. We find that the spectral features related to transitions between surface perturbed bulk wave functions are more strongly affected by self-energy corrections than anisotropies directly linked to surface electronic states. }}, author = {{Schmidt, Wolf Gero and FATTEBERT, J. L. and BERNHOLC, J. and BECHSTEDT, F.}}, issn = {{0218-625X}}, journal = {{Surface Review and Letters}}, number = {{6}}, pages = {{1159--1165}}, title = {{{SELF-ENERGY EFFECTS IN THE OPTICAL ANISOTROPY OF GaP(001)}}}, doi = {{10.1142/s0218625x99001281}}, volume = {{6}}, year = {{1999}}, } @article{13768, author = {{Frisch, A. M. and Schmidt, Wolf Gero and Bernholc, J. and Pristovsek, M. and Esser, N. and Richter, W.}}, issn = {{0163-1829}}, journal = {{Physical Review B}}, number = {{4}}, pages = {{2488--2494}}, title = {{{(2×4)GaP(001) surface: Atomic structure and optical anisotropy}}}, doi = {{10.1103/physrevb.60.2488}}, volume = {{60}}, year = {{1999}}, } @article{13769, author = {{Schmidt, Wolf Gero and Briggs, E. L. and Bernholc, J. and Bechstedt, F.}}, issn = {{0163-1829}}, journal = {{Physical Review B}}, number = {{3}}, pages = {{2234--2239}}, title = {{{Structural fingerprints in the reflectance anisotropy spectra ofInP(001)(2×4)surfaces}}}, doi = {{10.1103/physrevb.59.2234}}, volume = {{59}}, year = {{1999}}, } @inbook{19712, author = {{Büker, Petra}}, booktitle = {{Lernen und Lehren für Europa. Festschrift für Waltraut Schöler}}, editor = {{Tuyaerts, A. and Hagemann, W. and Tulodziecki, G.}}, pages = {{175--201}}, publisher = {{Lang}}, title = {{{Europaoffenes Lernen mit Grundschulkindern - Bedingungen und didaktische Perspektiven für einen neuen Aufgabenbereich der Primarstufe}}}, year = {{1998}}, } @inproceedings{3255, author = {{Gehrke, Thomas and Huhn, Michaela and Niebert, Peter and Rensink, Arend and Wehrheim, Heike}}, booktitle = {{Formale Beschreibungstechniken f{\"{u}}r verteilte Systeme, 8. GI/ITG-Fachgespr{\"{a}}ch, Cottbus, 4. und 5. Juni 1998}}, editor = {{K{\"{o}}nig, Hartmut and Langend{\"{o}}rfer, Peter}}, pages = {{185----196}}, title = {{{A Process Algebra Semantics for {MSC} Including Conditions}}}, year = {{1998}}, } @article{3601, author = {{Harteis, Christian and Prenzel, Manfred}}, journal = {{Zeitschrift für Pädagogik, H}}, pages = {{583----601}}, title = {{{Welche Kompetenzen brauchen betriebliche Weiterbildner in Zukunft}}}, year = {{1998}}, } @article{3621, author = {{Harteis, Christian and Prenzel, Manfred}}, journal = {{ZEITSCHRIFT FUR PADAGOGIK}}, number = {{4}}, pages = {{583----601}}, title = {{{Qualifications needed by educational staff working in the field of further education in the industrial sector-Results of a Delphi-study carried out in an industrial enterprise}}}, volume = {{44}}, year = {{1998}}, } @article{3675, author = {{Harteis, Christian}}, journal = {{Personal}}, pages = {{332----339}}, title = {{{Zur Qualitätsdebatte in der betrieblichen Bildungsarbeit}}}, volume = {{50}}, year = {{1998}}, } @inproceedings{20746, author = {{Hahn, O. and Eis, M. and Meschut, Gerson}}, booktitle = {{Tagungsband zum 6. Paderborner Symposium Fügetechnik}}, isbn = {{ISBN 3-9805447-1-0}}, location = {{Paderborn}}, pages = {{210--218}}, title = {{{Kleben abzeichnungsfreier Leichtbaustrukturen durch Prozeß-, Gestalt- und Klebstoffoptimierung}}}, year = {{1998}}, } @book{18144, author = {{Büker, Petra}}, publisher = {{Lang}}, title = {{{Erziehung zu europäischer Verständigung in der Grundschule - Bedingungen - didaktische Konkretisierung - Realisationsmöglichkeiten}}}, year = {{1998}}, } @inproceedings{11784, abstract = {{In this paper we describe some characteristics of the acoustic modeling used in the Philips continuous-speech recognition system for the DARPA Hub-4 1997 evaluation, which are related to robustness issues. We aimed at a conceptually simple system: We trained two model sets on 70 hours of the Hub-4 training data, one for within-word and one for cross-word decoding. These model sets were used for both genders and all environmental conditions. In order to be able to do so, channel normalization (mean, variance normalization) and speaker normalization (vocal tract length normalization, realized by an appropriate shift of the center frequencies of the mel filter bank) have been applied, as well as adaptation techniques. MLLR-based unsupervised batch adaptation on clusters of segments was conducted both after a first within-word decoding and a cross-word decoding pass. The training strategy and the effects of the various normalization and adaptation techniques will be discussed in the paper.}}, author = {{Haeb-Umbach, Reinhold and Aubert, Xavier L. and Beyerlein, Peter and Klakow, Dietrich and Ullrich, Meinhard and Wendemuth, Andreas and Wilcox, Patricia}}, booktitle = {{DARPA Broadcast News Transcription and Understanding Workshop, Landsdowne}}, title = {{{Acoustic Modeling in the Philips Hub-4 Continuous-Speech Recognition System}}}, year = {{1998}}, } @misc{17646, author = {{Peckhaus, Volker}}, booktitle = {{Routledge Encyclopedia of Philosophy, Bd. 4: Genealogy to Iqbal}}, editor = {{Craig, Edward}}, pages = {{23--25}}, publisher = {{Routledge}}, title = {{{Gentzen, Gerhard Karl Erich (1909–45)}}}, year = {{1998}}, } @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}}, }