TY - CONF AU - Müller, Wolfgang AU - Kleinjohann, Bernd ID - 39582 T2 - Proceedings of the 2nd EXPRESS User's Group Conference TI - The EXPRESS Information Modeling Workbench - A New Approach to Graphical Design Environments ER - TY - JOUR AU - MEISSNER, E AU - Noé, Reinhold AU - BORCHERT, B AU - RODLER, H ID - 38499 IS - 25 JF - ELECTRONICS LETTERS SN - 0013-5194 TI - DIRECT MODULATION 565 MBIT/S OPTICAL PSK HETERODYNE SYSTEM WITH SOLITARY SL-QW-DFB LASERS USING NOVEL SUPPRESSION OF PHASE-TRANSITION PERIODS IN CARRIER RECOVERY VL - 28 ER - TY - JOUR AU - Noé, Reinhold AU - RODLER, H AU - EBBERG, A AU - MEISSNER, E AU - BODLAJ, V AU - DROGEMULLER, K AU - WITTMANN, J ID - 38495 IS - 1 JF - ELECTRONICS LETTERS SN - 0013-5194 TI - FULLY ENGINEERED COHERENT MULTICHANNEL TRANSMITTERS AND RECEIVERS WITH LOW-COST POTENTIAL VL - 28 ER - TY - JOUR AU - Noé, Reinhold AU - DROGEMULLER, K ID - 38492 IS - 5 JF - IEEE PHOTONICS TECHNOLOGY LETTERS SN - 1041-1135 TI - ACCURATE AND SIMPLE OPTICAL FREQUENCY STABILIZATION FOR A COHERENT MULTICHANNEL SYSTEM VL - 4 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. AU - Heppke, G. ID - 40009 IS - 1 JF - Liquid Crystals KW - Condensed Matter Physics KW - General Materials Science KW - General Chemistry SN - 0267-8292 TI - Chromaticity of polymer-dispersed cholesteric liquid crystals VL - 12 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. ID - 40013 IS - 4 JF - Liquid Crystals KW - Condensed Matter Physics KW - General Materials Science KW - General Chemistry SN - 0267-8292 TI - Behaviour of polymer dispersed cholesteric droplets with negative dielectric anisotropy in electric fields VL - 11 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Xu, F. AU - Crooker, P. P. ID - 40008 IS - 6 JF - Liquid Crystals KW - Condensed Matter Physics KW - General Materials Science KW - General Chemistry SN - 0267-8292 TI - Microscopic observations of axial and radial nematic droplets for a dual-frequency addressable liquid crystal VL - 12 ER - TY - JOUR AU - Noé, Reinhold AU - MEISSNER, E AU - BORCHERT, B AU - RODLER, H ID - 38493 IS - 10 JF - IEEE PHOTONICS TECHNOLOGY LETTERS SN - 1041-1135 TI - DIRECT MODULATION 565 MB/S DPSK EXPERIMENT WITH 62.3 DB LOSS SPAN AND ENDLESS POLARIZATION CONTROL VL - 4 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. AU - Rand, J. AU - Xu, J. AU - Heppke, G. ID - 40075 IS - 3 JF - Journal de Physique II KW - Physics and Astronomy (miscellaneous) KW - General Engineering KW - Atomic and Molecular Physics KW - and Optics SN - 1155-4312 TI - Electrostriction dynamics of blue phase II crystallites VL - 2 ER - TY - JOUR AU - Dolganov, V. K. AU - Heppke, G. AU - Kitzerow, Heinz-Siegfried ID - 40077 IS - 10 JF - Journal de Physique II KW - Physics and Astronomy (miscellaneous) KW - General Engineering KW - Atomic and Molecular Physics KW - and Optics SN - 1155-4312 TI - Dynamic response of a blue phase to an applied field VL - 2 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Rand, J. AU - Crooker, P. P. ID - 40078 IS - 2 JF - Journal de Physique II KW - Physics and Astronomy (miscellaneous) KW - General Engineering KW - Atomic and Molecular Physics KW - and Optics SN - 1155-4312 TI - Dynamics of polymer-dispersed cholesteric liquid crystals VL - 2 ER - TY - JOUR AU - Xu, F. AU - Kitzerow, Heinz-Siegfried AU - Crooker, P. P. ID - 40331 IS - 10 JF - Physical Review A KW - Atomic and Molecular Physics KW - and Optics SN - 1050-2947 TI - Electric-field effects on nematic droplets with negative dielectric anisotropy VL - 46 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Molsen, Henning AU - Heppke, Gerd ID - 40329 IS - 25 JF - Applied Physics Letters KW - Physics and Astronomy (miscellaneous) SN - 0003-6951 TI - Linear electro‐optic effects in polymer‐dispersed ferroelectric liquid crystals VL - 60 ER - TY - JOUR AU - Kitzerow, Heinz-Siegfried AU - Molsen, Henning AU - Heppke, Gerd ID - 40330 IS - 5 JF - Polymers for Advanced Technologies KW - Polymers and Plastics SN - 1042-7147 TI - Helical unwinding in polymer-dispersed ferroelectric liquid crystals VL - 3 ER - TY - JOUR AB - We investigated the switching behavior of the well-known antiferroelectric liquid crystal (R)-4-(1-methylheptyloxycarbonyl)phenyl-4'-octyloxybiphenyl-4-carboxylate (MHPOBC), embedded in a polymer matrix. The alignment of the liquid crystal in the UV-cured adhesive was controlled by mechanical shear during the polymerization-induced phase separation. Multistable switching with time constants down to 150 µs indicates that antiferroelectric PDLC devices are promissing for electrooptic application as flexible displays. AU - Molsen, Henning AU - Kitzerow, Heinz-Siegfried AU - Heppke, Gerd ID - 40328 IS - 8A JF - Japanese Journal of Applied Physics KW - General Physics and Astronomy KW - General Engineering SN - 0021-4922 TI - Antiferroelectric Switching in Polymer-Dispersed Liquid Crystals VL - 31 ER - TY - JOUR AU - Molsen, H. AU - Kitzerow, Heinz-Siegfried AU - Heppke, G. ID - 40515 JF - SID Digest of Technical Papers TI - Deformed-Helix Ferroelectric Effect in Polymer-Dispersed Ferroelectric Liquid Crystals VL - XXIII ER - TY - JOUR AU - Crooker, P. P. AU - Kitzerow, Heinz-Siegfried ID - 40514 JF - Condensed Matter News TI - Blue Phases VL - 1 ER - TY - JOUR AB - The authors present a detailed study of coherent tunneling oscillations of an optically excited electronic wavepacket in a semiconductor double quantum-well structure. The oscillation of the wavepacket between the two wells is traced by time-resolved pump-probe spectroscopy as well as time-resolved degenerate four-wave mixing. The experimental observations are compared with a simple theoretical model. The motion of the wave packet is studied as a function of both an external electric field and the lattice temperature. While the oscillation frequency shows the expected dependence on electric field, it increases with temperature at fixed electric field when perfectly delocalized electronic states exist at low temperature. AU - Meier, Torsten AU - Leo, K. AU - Shah, J. AU - Damen, T.C. AU - Schulze, A. AU - Schmitt-Rink, S. AU - Thomas, P. AU - Göbel, E.O. AU - Chuang, S.L. AU - Luo, M.S.C. AU - Schäfer, W. AU - Köhler, K. AU - Ganser, P. ID - 43444 IS - 10 JF - IEEE journal of quantum electronics SN - 0018-9197 TI - Dissipative Dynamics of an Electronic Wavepacket in a Semiconductor Double Well Potential VL - 28 ER - TY - JOUR AB - We report the study of optical dephazing of Wannier-Stark ladder excitations in a semiconductor superlattice by means of transient degenerate four-wave mixing. We observe pronounced modulations of the signal with a time period varying linearly with the electric field. The time period is found to equal the temporal periodicity of Bloch oscillations, in agreement with theory. In addition, we find that the dephazing time decreases with increasing localization of the Wannier-Stark states, which is attributed to carrier escape out of the lowest miniband. AU - Meier, Torsten AU - Feldmann, J. AU - Leo, K. AU - Shah, J. AU - Miller, D.A.B. AU - Cunningham, J.E. AU - von Plessen, G. AU - Schulze, A. AU - Thomas, P. AU - Schmitt-Rink, S. ID - 43443 IS - 11 JF - Physical Review B TI - Optical investigation of Bloch oscillations in a semiconductor superlattice VL - 46 ER - TY - JOUR AB - Femtosecond nonlinear laser spectroscopy is applied to study the dynamics of coherent optical excitations in semiconductors. In particular, excitonic excitations in quantum wells and superlattice structures are considered. Two examples demonstrate that four-wave mixing experiments with time-resolved detection of the nonlinear signal are able to distinguish between quantum beats and polarization interference.v AU - Meier, Torsten AU - Göbel, E.O. AU - Koch, M. AU - Feldmann, J. AU - von Plessen, G. AU - Schulze, A. AU - Thomas, P. AU - Schmitt-Rink, S. AU - Köhler, K. AU - Ploog, K. ID - 43445 IS - 1 JF - physica status solidi (b) TI - Time Resolved Four Wave Mixing in GaAs/AlAs Quantum Well Structures VL - 173 ER - TY - CONF AU - Hilleringmann, Ulrich AU - Adams, S AU - Goser, K ID - 39917 T2 - Proceedings ISSSE’92 TI - A Silicon Technology for Monolithic Integration of Optical Waveguides, Photodetectors and VLSI CMOS Circuits ER - TY - CONF AU - Adams, S AU - Hilleringmann, Ulrich AU - Goser, K ID - 39918 T2 - EFOC LAN TI - Electrooptical coupling of waveguides and VLSI circuits integrated on one silicon chip ER - TY - JOUR AU - Schroeter-Wittke, Harald ID - 43483 JF - Der Evangelische Erzieher TI - Michel plays Petrucciani. Oder: "So wenig sind wir auf uns selbst gestellt." Oder: Praktisch-theologische Wahr-Nehmungen in dem "Spielraum von Schnitten" VL - 44 ER - TY - CONF AB - Summary form only given. The numerical investigations are based on a microscopic many-body theory which allows one to compute the linear and nonlinear optical properties of semiconductor superlattices in the presence of homogeneous electric fields applied in the growth direction. The THz-emission due to the field-driven dynamics of photoexcited carriers is investigated for the combined action of static and alternating fields. For a driving field it was shown within a simple model that the equations governing the intraband dynamics in the field-driven superlattice should be analogous to the ones describing the superconducting Josephson junction. The transport properties in this regime can be described by the picture of multi-photon-assisted tunneling between Wannier-Stark states. AU - Meier, Torsten AU - Thomas, P. AU - Koch, S.W. ID - 44291 SN - 1-55752-576-X T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - THz-emission from photoexcited semiconductor superlattices with applied ac and dc electric fields ER - TY - CONF AB - Summary form only given. Partly non-degenerate four-wave mixing is able to detect coherent coupling between excitonic resonances like e.g. light-hole and heavy-hole excitons or between an exciton and its continuum states. We apply an extension of this method, which we call selective coherent spectroscopy (SCS), to symmetrically strained (GaIn)As/Ga(PAs) multiple quantum-wells. The samples are excited simultaneously by a picosecond pulse with wavevector k/sub 1/ and a 100 fs pulse with wavevector k/sub 2/. The central wavelength of the picosecond pulse is scanned over the entire spectrum of the 100 fs pulse and the four-wave mixing signal in the direction 2k/sub 2/-k/sub 1/ is detected at a fixed energy. This scan provides an SCS spectrum. AU - Meier, Torsten AU - Euteneuer, A. AU - Finger, E. AU - Hofmann, M. AU - Stolz, W. AU - Thomas, P. AU - Koch, S.W. AU - Ruhle, W.W. ID - 44292 T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - Distribution of exciton binding-energies in disordered semiconductor quantum-wells ER - TY - CONF AB - Summary form only given. For a proper understanding of nonlinear optical experiments in semiconductors even the low-density limit Coulomb-induced many body correlations beyond the Hartree-Fock decoupling scheme need to be considered. In the coherent X(3) limit these correlations manifest themselves in the contributions of bound and unbound two-exciton states to the optical response. The understanding of nonlinear excitonic effects in the Stark effect of semiconductors including carrier-correlations is still of fundamental interest. AU - Meier, Torsten AU - Sieh, C. AU - Koch, S.W. AU - Brick, P. AU - Hubner, M. AU - Ell, C. AU - Prineas, J. AU - Khitrova, G. AU - Gibbs, H.M. ID - 44290 SN - 1-55752-576-X T2 - Technical Digest. Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference TI - Influence of carrier-correlations on the optical Stark effect of semiconductors ER - TY - CONF AB - Recent experiments by Roskos et al. in ultrashort optical pulse excitation of biased coupled quantum wells have shown remarkable generation of terahertz electromagnetic radiation. Two different effects were identified: (i) an oscillatory field of frequency corresponding to the separation between the coupled levels in the quantum-well pair (~ 1.5 THz); and (ii) an “instantaneous” electromagnetic field pulse that appears to follow the time evolution of the exciting laser pulse. The oscillatory field is understood to be caused by the coherent oscillation of optically created electrons from one well to the other.[1] The “instantaneous” part we believe is caused by a new mechanism proposed in Ref. 2. The essence of this “instantaneous” mechanism is that electron-hole pairs are created in a biased semiconductor with a net polarization. The density of these pairs follows the light field, as does the induced polarization, hence, generating an electromagnetic source that follows the light pulse. Such mechanisms have been discussed before for photon energies below the optical bandgap energy,[3] although they have so far been difficult to observe. In our work, we have generalized and extended such effects to photon energies above the handgap energy. In this paper we will discuss both of these mechanisms as well as the fourwave-mixing (FWM) signal,[4] and show how they can be understood within one unified formalism. We will also show that the calculations agree well with the experimental results. AU - Meier, Torsten AU - Schulze, A. AU - Scmittrink, S. AU - Thomas, P. AU - Chuang, S.L. ID - 44289 T2 - International Quantum Electronics Conference TI - Terahertz Electromagnetic Pulse Generation and Four-Wave Mixing in Coupled Quantum Wells ER - TY - CONF AB - In the presence of a homogeneous electric field, 𝐹→, each Bloch state in a crystal changes quasimomentum according to the so-called acceleration theorem Thus, in the absence of interband tunneling and scattering processes, each Bloch state moves at a constant velocity in k-space and executes a periodic motion in the reduced zone scheme by undergoing a Bragg reflection between each two traversals of the Brillouin zone. AU - Meier, Torsten AU - von Plessen, G. AU - Schulze, A. AU - Thomas, P. ID - 44288 T2 - International Quantum Electronics Conference TI - On the Observability of Bloch Oscillations in Time-Resolved Four-Wave-Mixing ER - TY - GEN AU - Herzig, Bardo ID - 45259 TI - Entwurf einer Benutzeroberfläche für die Analyse von kontextfreien und DCG - Grammatiken und ihre didaktische Verwendung. Erste Staatsarbeit im Fach Informatik ER - TY - CONF AU - Jonas-Ahrend, Gabriela ID - 47608 TI - Physics Education in East and West Germany ER - TY - CHAP AU - Eke, Norbert Otto ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19432 T2 - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn TI - „Wie wird künftig Meusel die hungrige Nachwelt hetzen und peinigen“. Deutsche Romane 1815-1830 in der Fürstlichen Bibliothek Corvey. Vorläufiges zum Forschungsprojekt „Der deutsche Roman 1815-1830" ER - TY - CHAP AB - Angaben zur Herausgeberschaft: Hg. von Rainer Schöwerling und Hartmut Steinecke unter Mitarbeit von Norbert Otto Eke und Günter Tiggesbäumker AU - Eke, Norbert Otto ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19488 T2 - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn TI - Diskussionsberichte zu den Sektionen 2 („Roman“) und 3 („Dramen“) sowie der Abschlußdiskussion des 1. Internationalen Corvey-Symposions ER - TY - BOOK AB - Präzisierung der Herausgeberschaft: Hg. von Rainer Schöwerling und Hartmut Steinecke unter Mitarbeit von Norbert Otto Eke und Günter Tiggesbäumker ED - Schöwerling, Rainer ED - Steinecke, Hartmut ED - Eke, Norbert Otto ED - Tiggesbäumker, Günter ID - 19091 TI - Die Fürstliche Bibliothek Corvey. Ihre Bedeutung für eine neue Sicht der Literatur des frühen 19. Jahrhunderts. Beiträge des 1. Internationalen Corvey-Symposions. 25.-27. Oktober 1990 in Paderborn ER - TY - GEN AU - Hilgert, Joachim ID - 51585 T2 - JBer. DMV TI - Fomenko, A.T. Symplectic Geometry (Gordon and Breach, 1988) VL - 94 ER - TY - JOUR AU - Hilgert, Joachim AU - Ólafsson, G. ID - 51442 JF - Japan. J. Math. TI - Analytic Extensions of Representations, the Solvable Case VL - 18 ER - TY - JOUR AU - Hilgert, Joachim ID - 51443 JF - Math. Zeitschrift TI - Controllability on Real Reductive Groups VL - 209 ER - TY - JOUR AU - Flögel, A. AU - Kleine Büning, H. AU - Lettmann, Theodor ID - 19814 JF - RAIRO - Theoretical Informatics and Applications SN - 0988-3754 TI - On the restricted equivalence for subclasses of propositional logic ER - TY - GEN AU - Simon, Jens ID - 2453 TI - Benutzung virtueller Topologien unter PARIX ER - TY - GEN AU - Röttger, Markus AU - Simon, Jens AU - Schroeder, Ulf-Peter ID - 2454 TI - Virtual Topology Library for PARIX ER - TY - GEN AU - Diekmann, Ralf AU - Lüling, Reinhard AU - Simon, Jens ID - 2455 TI - Problem Independent Distributed Simulated Annealing and its Applications ER - TY - CHAP AU - Diekmann, Ralf AU - Simon, Jens ID - 2456 SN - 978-3-642-46787-5 T2 - Applied Simulated Annealing TI - Problem Independent Distributed Simulated Annealing and its Applications VL - 396 ER - TY - GEN AU - Blömer, Johannes ID - 3045 TI - On Kummer theory and the number of roots of unity in radical extensions of Q ER - TY - JOUR AU - Gries, Thomas AU - Wigger, B. ID - 3069 IS - 4 JF - Economia Internationale TI - The Dynamics of Upgrading or how to catch-up VL - 46 ER - TY - BOOK AU - Fuchssteiner, Benno AU - Wiwianka, W. AU - Gottheil, K. AU - Kemper, A. AU - Kluge, O. AU - Morisse, K. AU - Naundorf, H. AU - Oevel, Gudrun AU - Schulze, T. ID - 17302 TI - MuPAD: Multi Processing Algebra Data Tool; Benutzerhandbuch; MuPAD Version 1.1 ER - TY - CONF AU - Peckhaus, Volker ED - Stelzner, Werner ID - 17476 T2 - Philosophie und Logik. Frege-Kolloquien Jena 1989/1991 TI - Ernst Schröder und der Logizismus VL - 3 ER - TY - BOOK ED - Meyer auf der Heide, Friedhelm ED - Monien, B. ED - Rosenberg, A. L. ID - 17477 SN - 0302-9743 TI - Parallel Architectures and Their Efficient Use ER - TY - CHAP AU - Peckhaus, Volker ED - Haller, Rudolf ED - Stadler, Friedrich ID - 17478 T2 - Wien—Berlin—Prag. Der Aufstieg der wissenschaftlichen Philosophie. Zentenarien Rudolf Carnap–Hans Reichenbach–Edgar Zilsel TI - Kurt Grelling und der Logische Empirismus VL - 2 ER - TY - CONF AU - Kastens, Uwe AU - Meyer auf der Heide, Friedhelm AU - Wachsmann, Alf AU - Wichmann, Friedrich ID - 17479 T2 - Proc. 3rd PASA Workshop, PARS Mitteilungen TI - OCCAM-light: A Language Combining Shared Memory and Message Passing (A First Report) ER - TY - JOUR AB - Page 4 AU - Peckhaus, Volker ID - 19046 IS - 4 JF - The Mathematical Intelligencer TI - Fotografie: Ivor Grattan-Guinness (Erlangen, 21.2.1989) VL - 15 ER - TY - BOOK ED - Eke, Norbert Otto ED - Helmes, Günter ID - 19090 TI - Richard Beer-Hofmann (1866-1945). Studien zu seinem Werk ER - TY - BOOK AU - Eke, Norbert Otto ID - 19137 TI - Stanislaw Przybyszewski: Schnee und andere Dramen (Edition) VL - 5 ER - TY - BOOK AU - Eke, Norbert Otto AU - Oellers, Norbert AU - Skrodzki, Karl Jürgen AU - Steinecke, Hartmut ID - 19148 TI - Nikolaus Lenau. Werke und Briefe. Historisch-kritische Gesamtausgabe. Bd. 7. Aufzeichnungen. Vermischte Schriften. Text und Kommentar (Edition) ER - TY - CHAP AU - Eke, Norbert Otto ED - Eke, Norbert Otto ED - Helmes, Günter ID - 19427 T2 - Richard Beer-Hofmann (1866-1945). Studien zu seinem Werk TI - Rettung des Sinns. Jaákobs Traum und das Projekt einer Geschichtstheodizee ER - TY - CHAP AU - Eke, Norbert Otto AU - Helmes, Günter ED - Eke, Norbert Otto ED - Helmes, Günter ID - 19428 T2 - Richard Beer-Hofmann (1866-1945). Studien zu seinem Werk TI - Richard Beer-Hofmann – Zur Einführung ER - TY - CHAP AU - Eke, Norbert Otto ID - 19429 T2 - Grabbe Jahrbuch 12 TI - „Freiheit ist nur in dem Reich der Träume“. Revolutionsprojektionen deutscher Dramen nach 1789. Ein historischer Aufriß (mit einem Ausblick bis zum Nachmärz) ER - TY - JOUR AU - Eke, Norbert Otto ID - 19430 IS - H. 2 JF - Zeitschrift für Germanistik TI - Eine Gesamtbibliographie des deutschen Romans 1815-1830. Anmerkungen zum Problemfeld von Bibliographie und Historiographie VL - NF III ER - TY - CHAP AU - Eke, Norbert Otto ED - Scheuer, Helmut ID - 19431 T2 - Dichter und ihre Nation TI - „Deutschland ortlos“. Dekonstruktionen des Nationalen bei Heiner Müller ER - TY - JOUR AU - Trächtler, Ansgar ID - 23365 JF - Process Tomography - a Strategy for Industrial Exploitation TI - Use of Symmetries in Tomography ER - TY - JOUR AU - Trächtler, Ansgar ID - 23366 JF - at-Automatisierungstechnik TI - Vollständige Modale Synthese stationär unstörbarer und stationär perfekter Zustandsregelungen VL - 41 ER - TY - CONF AU - Engels, Gregor AU - Verrijn-Stuart, A.A. ID - 7826 IS - 251 T2 - Fortschritt-Berichte VDI TI - Integrationsaspekte bei verteilter Software-Entwicklung ER - TY - CONF AU - Krauter, Stefan AU - Hanitsch, Rolf ID - 8089 T2 - Proceedings of the Cairo International Conference of Renewable Energy Sources, Kairo (Ägypten), 30. Dezember 1992 – 2. Januar 1993 TI - Calculating the Influence of Skylight-Polarization on the Transmission of Encapsulations of PV-Modules ER - TY - CONF AU - Krauter, Stefan AU - Hanitsch, Rolf ID - 8090 T2 - Proceedings of the ISES Solar World Congress 1993, Budapest (Ungarn), 23.–27. August 1993, Band 3, S. 249–254 TI - Optical and Thermal Parameters of PV-Module Encapsulation Improving Output Power ER - TY - BOOK AU - Krauter, Stefan ID - 8091 TI - Betriebsmodell der optischen, thermischen und elektrischen Parameter von PV-Modulen ER - TY - GEN AU - Andries, Marc AU - Engels, Gregor ID - 8190 TI - A Hybrid Query Language for the Extended Entity Relationship Model ER - TY - GEN AU - Ehrig, Hartmut AU - Engels, Gregor ID - 8191 TI - Towards a Module Concept for Graph Transformation Systems ER - TY - GEN AU - Engels, Gregor AU - Rozenberg, Grzegorz ID - 8192 TI - Abstracts COMPUGRAPH II Workshop ER - TY - CONF AU - Engels, Gregor AU - Groenewegen, Luuk ID - 8262 T2 - Proceedings of the Workshop on Software Process (ISPW 1993), Wadern (Germany) TI - Modular, Visual Specifications of Software Processes ER - TY - JOUR AU - Sextro, Walter AU - Schmalhorst, B ID - 8895 JF - Zeitschrift für angewandte Mathematik und Mechanik (ZAMM) TI - Static Behaviour of Drill Strings in Curved Boreholes VL - 73 ER - TY - JOUR AU - Barany, Ernest AU - Dellnitz, Michael AU - Golubitsky, Martin ID - 16518 JF - Physica D: Nonlinear Phenomena SN - 0167-2789 TI - Detecting the symmetry of attractors ER - TY - JOUR AU - Krimphove, Dieter ID - 1655 IS - 19. Lieferung JF - Bankkalender 1994 TI - Anmerkungen zum Manteltarifvertrag der Banken - Eine Kommentierung des Manteltarifvertrages des Bankgewerbes 1993 ER - TY - JOUR AU - Krimphove, Dieter ID - 1656 IS - Januar-Heft JF - Recht der Landwirtschaft TI - Erzeugergemeinschaften: Wettbewerbsrechtliche Möglichkeiten zur Unternehmenskooperation in der Landwirtschaft ER - TY - JOUR AU - Krimphove, Dieter ID - 1657 IS - Heft 1 JF - Agrarrecht TI - Neuer europäischer Schutz von Marken- und Herkunftszeichen in der Landwirtschaft ER - TY - JOUR AU - Krimphove, Dieter ID - 1658 IS - Mai JF - Europäische Zeitschrift für Wirtschaftsrecht (EuZW) TI - Europäisches Arbeitsrecht ER - TY - JOUR AB - AbstractWe obtain normal forms for infinitesimally symplectic matrices (or linear Hamiltonian vector fields) that commute with the symplectic action of a compact Lie group of symmetries. In doing so we extend Williamson's theorem on normal forms when there is no symmetry present.Using standard representation-theoretic results the symmetry can be factored out and we reduce to finding normal forms over a real division ring. There are three real division rings consisting of the real, complex and quaternionic numbers. Of these, only the real case is covered in Williamson's original work. AU - Melbourne, Ian AU - Dellnitz, Michael ID - 16633 JF - Mathematical Proceedings of the Cambridge Philosophical Society SN - 0305-0041 TI - Normal forms for linear Hamiltonian vector fields commuting with the action of a compact Lie group ER - TY - JOUR AU - Melbourne, Ian AU - Dellnitz, Michael AU - Golubitsky, Martin ID - 16634 JF - Archive for Rational Mechanics and Analysis SN - 0003-9527 TI - The structure of symmetric attractors ER - TY - JOUR AU - Dietzfelbinger, M. AU - Meyer auf der Heide, Friedhelm ID - 16729 JF - Information and Computation SN - 0890-5401 TI - An Optimal Parallel Dictionary ER - TY - CHAP AU - Meyer auf der Heide, Friedhelm AU - Oesterdiekhoff, Brigitte AU - Wanka, Rolf ID - 16730 SN - 0302-9743 T2 - Automata, Languages and Programming TI - Strongly adaptive token distribution ER - TY - CONF AU - Dietzfelbinger, Martin AU - Meyer auf der Heide, Friedhelm ID - 16731 SN - 0897915992 T2 - Proceedings of the fifth annual ACM symposium on Parallel algorithms and architectures - SPAA '93 TI - Simple, efficient shared memory simulations ER - TY - CHAP AU - Lürwer-Brüggemeier, Katharina AU - Meyer auf der Heide, Friedhelm ID - 16732 SN - 0302-9743 T2 - Lecture Notes in Computer Science TI - Capabilities and complexity of computations with integer division ER - TY - CONF AU - Domik, Gitta ED - D. Franklin, Stephen ED - R. Stubberud, Allen ED - P. Wiedeman, Lyle ID - 16828 T2 - University Education Uses of Visualization in Scientific Computing, Proceedings of the {IFIP} {WG3.2} Working Conference on Visualization in Scientific Computing: Uses in University Education, Irvine, CA, USA, 28-30 July, 1993 TI - Education in Scientific Visualization VL - {A-48} ER - TY - CONF AU - Domik, Gitta ED - Maurer, H. ID - 16906 T2 - Proceedings of ED Media '93 TI - Scientific Visualization ER - TY - JOUR AU - Dellnitz, Michael ID - 17013 JF - Lectures in Applied Mathematics TI - The equivariant Darboux theorem VL - 29 ER - TY - CONF AB - Linear discriminant analysis (LDA) experiments reported previously (ICASSP-92 vol.1, p.13-16), are extended to context-dependent models and speaker-independent large vocabulary continuous speech recognition. Two variants of using mixture densities are compared: state-specific modeling and the monophone-tying approach where densities are shared across the states relevant to the same phoneme. Results are presented on the DARPA Resource Management (RM) task for both speaker-dependent (SD) and speaker-independent (SI) parts. Using triphone models based on LDA and continuous mixture densities, significant improvements have been observed and the following word error rates have been achieved: for the SD part, 7.8% without grammar and 1.5% with word pair; and for the SI part, 17.2% and 4.6%, respectively. These scores are averaged over 1200 SD or SI evaluation sentences and are among the best published so far on the RM database. AU - Aubert, Xavier L. AU - Haeb-Umbach, Reinhold AU - Ney, Hermann ID - 11718 T2 - ICASSP, Minneapolis TI - Continuous Mixture Densities and Linear Discriminant Analysis for Improved Context-Dependent Acoustic Models ER - TY - JOUR AB - To decrease the hazards of using mobile phones while driving, voice processing provides several tools that simplify their use: echo cancellation allows comfortable hands-free conversation, feedback and user guidance by voice allow to operate the phone in eyes-busy situations, and last not least speech recognition frees from keypad data entry to operate the telephone. A comprehensive view of a device incorporating the above mentioned technologies, which has been realized as an add-on for the Philips car telephone family, will be presented. Emphasis is placed on the speech recognition algorithms. Robustness of the algorithms to changing acoustic environment was improved by estimating and subtracting the long-term spectrum. We will show that, if this operation is done recursively, it is equivalent to the high-pass filtering or RASTA (Relative Spectral Approaches) methods recently proposed in the literature. AU - Dobler, Stefan AU - Geller, Dieter AU - Haeb-Umbach, Reinhold AU - Meyer, Peter AU - Ney, Hermann AU - Ruehl, Hans Wilhelm ID - 11749 JF - Speech Communication TI - Design and use of speech recognition algorithms for a mobile radio telephone ER - TY - CONF AB - Four methods were used to reduce the error rate of a continuous-density hidden Markov-model-based speech recognizer on the TI/NIST connected-digits recognition task. Energy thresholding sets a lower limit on the energy in each frequency channel to suppress spurious distortion accumulation caused by random noise. This led to an improvement in error rate by 15%. Spectrum normalization was used to compensate for across-speaker variations, resulting in an additional improvement by 20%. The acoustic resolution was increased up to 32 component densities per mixture. Each doubling of the number of component densities yielded a reduction in error rate by roughly 20%. Linear discriminant analysis was used for improved feature selection. A single class-independent transformation matrix was applied to a large input vector consisting of several adjacent frames, resulting in an improvement by 20% for high acoustic resolution. The final string error rate was 0.84%. AU - Haeb-Umbach, Reinhold AU - Geller, Dieter AU - Ney, Hermann ID - 11788 T2 - ICASSP, Minneapolis TI - Improvements in Connected Digit Recognition Using Linear Discriminant Analysis and Mixture Densities ER - TY - CONF AB - This paper gives a status report of the Philips research system for phoneme-based, large-vocabulary, continuous-speech recognition. Like for many other systems, the recognition architecture is based on an integrated statistical approach. We describe the characteristic features of the system as opposed to other systems: 1. The Viterbi criterion is consistently applied both in training and testing. 2. Continuous mixture densities are used without tying or smoothing. 3. Time-synchronous beam search in connection with a phoneme look-ahead is applied to a tree-organized lexicon. The system has been successfully applied to the American English DARPA RM task. Here, we report experimental results for a German 13 000-word Philips internal dictation task. In addition to the scientific prototype, a PC version has been set up which is described here for the first time. AU - Steinbiss, Volker AU - Ney, Hermann AU - Haeb-Umbach, Reinhold AU - Train, B.-H. AU - Essen, U. AU - Kneser, Reinhard AU - Oerder, Martin AU - Meier, H. G. AU - Aubert, X. AU - Dugast, Christian AU - Geller, Dieter AU - Hoellerbauer, W. AU - Bartosik, H. ID - 11904 T2 - EUROSPEECH, Berlin TI - The Philips Research System for Large-Vocabulary Continuous-Speech Recognition ER - TY - JOUR AU - Domik, Gitta ID - 15045 JF - COMPUTER GRAPHICS-NEW YORK-ASSOCIATION FOR COMPUTING MACHINERY- TI - An Agenda for Education in Scientific Visualization, Visualization'92 Workshop Report VL - 27 ER - TY - JOUR AU - Domik, Gitta ID - 15273 IS - 2 JF - Computers & Graphics SN - 1017-4656 TI - Guidelines for a curriculum in scientific visualization VL - 17 ER - TY - CONF AU - Domik, Gitta AU - Joslyn, C AU - Segura, T ID - 15275 T2 - Proceedings of the Vienna Conference on Human Computer Interaction TI - Macroscopic and Microscopic Aspects of Glyphs ER - TY - JOUR AU - Schmidt, Wolf Gero AU - Srivastava, G P ID - 13857 IS - 49 JF - Journal of Physics: Condensed Matter SN - 0953-8984 TI - Chemisorption of aluminium on GaAs(110) VL - 5 ER - TY - JOUR AU - Schmidt, Wolf Gero AU - Wenzien, Bernd AU - Bechstedt, Friedhelm ID - 13858 IS - 9-10 JF - Czechoslovak Journal of Physics SN - 0011-4626 TI - AB initio calculation of the atomic and electronic structure for Sb adsorbed on GaAs(110) VL - 43 ER - TY - GEN AU - Hellebrand, Sybille AU - Tarnick, Steffen AU - Rajski, Janusz AU - Courtois, Bernard ID - 13081 KW - WORKSHOP TI - Effiziente Erzeugung deterministischer Muster im Selbsttest ER - TY - GEN AU - Hellebrand, Sybille AU - Wunderlich, Hans-Joachim ID - 13082 KW - WORKSHOP TI - Synthesis of Self-Testable Controllers ER - TY - JOUR AU - Platzner, Marco AU - Steger, Christian ID - 13466 JF - Mikroelektronik TI - Erfahrungen mit einer Multi-Signalprozessorarchitektur (TMS320C40) ER - TY - CONF AU - Platzner, Marco AU - Steger, Christian AU - Weiss, Reinhold ID - 13467 T2 - Proceedings of the 4th International Conference on Signal Processing Applications & Technology (ICSPAT) TI - Performance Measurements on a Multi-DSP Architecture with TMS320C40 ER - TY - CONF AU - Lüdeke, H.-P. AU - Maas, Jürgen AU - Fröhleke, Norbert AU - Grotstollen, Horst ID - 30015 T2 - Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting TI - Controller design for resonant converters by automatable techniques ER - TY - GEN AU - Peckhaus, Volker ID - 17761 T2 - History and Philosophy of Logic TI - Arie L. Molendijk, Aus dem Dunklen ins Helle. Wissenschaft und Theologie im Denken von Heinrich Scholz. Mit unveröffentlichten Thesenreihen von Heinrich Scholz und Karl Barth. Rodopi: Amsterdam/Atlanta, GA 1991 (= Amsterdam Studies in Theology; VIII) VL - 14 ER - TY - GEN AU - Peckhaus, Volker ID - 17773 T2 - Modern Logic TI - Ein Jahrhundert Mathematik 1890–1990. Festschrift zum Jubiläum der DMV. hg. v. Gerd Fischer/Friedrich Hirzebruch/Winfried Scharlau/Willi Törnig, Friedrich Vieweg & Sohn: Braunschweig/Wiesbaden 1990 (= Dokumente zur Geschichte der Mathematik; 6) VL - 3 ER - TY - GEN AU - Peckhaus, Volker ED - Hormigon, Mariano ED - Ausejo, Elena ED - Dhombres, Jean ID - 17831 T2 - XIXth International Congress of History of Science. 22–29 August 1993 Zaragoza (Spain). Book of Abstracts Symposia TI - The Development of Ernst Schröder’s Attitude towards Logic [Abstract] VL - Nr. 4.2 ER - TY - GEN AU - Peckhaus, Volker ED - Toepell, Michael ID - 17829 T2 - Fachsektion Geschichte der Mathematik der Deutschen Mathematiker-Vereinigung. Sektionstagung vom 22. bis 26. März 1993 in Wuppertal TI - Leibniz’ ,Mathesis universalis‘ und die Mathematiker des 19. Jahrhunderts [Abstract] ER -