@article{ZaikinRosenblumScheffczyketal.1997, author = {Zaikin, Alexei A. and Rosenblum, Michael and Scheffczyk, Christian and Engbert, Ralf and Krampe, Ralf-Thomas and Kurths, J{\"u}rgen}, title = {Modeling qualitative changes in bimanual movements}, year = {1997}, language = {en} } @article{SchiekScheffczykEngbertetal.1997, author = {Schiek, Michael and Scheffczyk, Christian and Engbert, Ralf and Kurths, J{\"u}rgen and Krampe, Ralf-Thomas and Kliegl, Reinhold and Drepper, Friedhelm R.}, title = {Symbolic dynamics of physiological synchronisation : examples from bimanual movements and cardiorespiratory interaction}, year = {1997}, abstract = {Key words: Nonlinear time series analysis, symbolic dynamics, phase transitions, physiological data, biological synchronization, production of polyrhythms, cardiorespiratory interaction, variation of control parameter}, language = {en} } @article{ScheffczykKrampeEngbertetal.1997, author = {Scheffczyk, Christian and Krampe, Ralf-Thomas and Engbert, Ralf and Rosenblum, Michael and Kurths, J{\"u}rgen and Kliegl, Reinhold}, title = {Tempo-induced transitions in polyrhythmic hand movements}, year = {1997}, abstract = {We investigate the cognitive control in polyrhythmic hand movements as a model paradigm for bimanual coordination. Using a symbolic coding of the recorded time series, we demonstrate the existence of qualitative transitions induced by experimental manipulation of the tempo. A nonlinear model with delayed feedback control is proposed, which accounts for these dynamical transitions in terms of bifurcations resulting from variation of the external control parameter. Furthermore, it is shown that transitions can also be observed due to fluctuations in the timing control level. We conclude that the complexity of coordinated bimanual movements results from interactions between nonlinear control mechanisms with delayed feedback and stochastic timing components.}, language = {en} } @article{PapraPenacoradaReicheetal.1997, author = {Papra, Alex and Penacorada, Florencio and Reiche, J{\"u}rgen and Katholy, Stefan and Brehmer, Ludwig and Hicke, Hans-Georg}, title = {Structure and Stability of Langmuir Monolayers and Langmuir-Blodgett Films of Bisaroyl Azide Bolaamphiphiles}, year = {1997}, abstract = {Langmuir-Blodgett films of bolaamphiphiles with reactive head groups can be used for the surface modification of composite membranes for gas separation processes. The scope of our investigations was to get a detailed insight in the monolayer behaviour and LB film structure of previously synthesized bisaroyl azide bolaamphiphiles. The layers have been analyses by means of surface potential measurements and Brewster angle microscopy. Furthermore parameters for a successful LB Film deposition were found. As expected for a molecule with two hydrophilic ends the transfer ratio on upstroke was close to one and on downstroke no transfer occurred. The multilayer structure was analysed by scanning force microscopy and X-ray reflectivity measurements. The SFM images revealed a periodic in plane structure on molecular level. Based on a combination of the X-ray data with results of other methods two possible models of the multilayer structure are presented}, language = {en} } @article{WesselKleinerVossetal.1997, author = {Wessel, Niels and Kleiner, H. J. and Voss, Andreas and Kurths, J{\"u}rgen and Dietz, R.}, title = {Nonlinear dynamics in cardiovasscular diseases}, year = {1997}, language = {en} } @article{ZaksRosenblumPikovskijetal.1997, author = {Zaks, Michael A. and Rosenblum, Michael and Pikovskij, Arkadij and Osipov, Grigory V. and Kurths, J{\"u}rgen}, title = {Phase synchronization of chaotic oscillations in terms of periodic orbits}, issn = {1054-1500}, year = {1997}, language = {en} } @article{ZaikinRosenblumLandaetal.1997, author = {Zaikin, Alexei A. and Rosenblum, Michael and Landa, Polina S. and Kurths, J{\"u}rgen}, title = {Control of noise-induced oscillations of a pendulum with a rondomly vibrating suspension axis}, year = {1997}, language = {en} } @article{KuznetsovPikovskijBezruckoetal.1997, author = {Kuznetsov, Sergey P. and Pikovskij, Arkadij and Bezrucko, B. P. and Seleznev, E. P. and Feudel, Ulrike}, title = {O dinamike nelinejnych sistem po vne¬nim kvaziperiodi\Seskim vozdejstviem vblizi to\Ski okon\Sanija linii bifurkatcii udvoenija tora}, year = {1997}, language = {de} } @article{HuntGrebogiBarretoetal.1997, author = {Hunt, Brain R. and Grebogi, Celso and Barreto, Ernest and Yorke, James A.}, title = {From high dimensional chaos to stable periodic orbits : the structure of parameter space}, year = {1997}, language = {en} } @article{SaparinKurthsGowinetal.1997, author = {Saparin, Peter and Kurths, J{\"u}rgen and Gowin, P. and Felsenberg, D.}, title = {Die quantitative Beurteilung trabecul{\"a}rer Knochenstrukturen der Lendenwirbelk{\"o}rper durch Meßmethoden der nicht-linearen Dynamik}, year = {1997}, language = {de} } @article{ReicheKnochenhauerDieteletal.1997, author = {Reiche, J{\"u}rgen and Knochenhauer, Gerald and Dietel, Reinhard and Freydank, Anke-Christine and Zetzsche, Thomas and Pietsch, Ullrich and Brehmer, Ludwig and Barberka, Thomas Andreas and Geue, Thomas}, title = {Structure of thermally treated oxadiazoleamide Langmuir-Blodgett films}, year = {1997}, abstract = {The thermal treatment of Y-type Langmuir-Blodgett (LB) films formed from the amphiphilic derivative of 2,5- diphenyl-1,3,4-oxadiazole 1 results in changes of the molecular packing. These changes have been analysed by a combination of X-ray specular reflectivity data, X-ray grazing incidence diffraction data and scanning force microscopy images, On the basis of these experimental data we have simulated possible supramolecular structures, These simulations provide insight into the intermolecular interactions giving rise to the observed structural transitions. The crystalline structure induced by thermal treatment of the LB films is characterized by a uniaxial texture, which is correlated with the dipping direction during deposition of the LB film.}, language = {en} } @article{ReichePenacoradaGeueetal.1997, author = {Reiche, J{\"u}rgen and Penacorada, Florencio and Geue, Thomas and Pietsch, Ullrich and Brehmer, Ludwig}, title = {Monolayers and multilayers of uranyl arachidate : in-plane structure of uranyl arachidate multilayers}, year = {1997}, abstract = {The molecular in-plane structure of uranyl arachidate Langmuir-Blodgett (LB) films formed at different subphase pH values was analysed by means of X-ray grazing-incidence diffraction. For multilayers formed at low subphase pH a reorganisation of the arachidic acid film structure is confirmed. At appropriate subphase pH values, reorganisation of the film structure, e.g. via the formation of three-dimensional crystallites, is prevented by the presence of the uranyl ions and by the subsequent introduction of conformational disorder (gauche defects) in the alkyl chains. The observation of a macroscopic flow-induced in-plane texture in these uranyl arachidate LB films has profound implications for the design of ordered, supramolecular structures by the Langmuir-Blodgett technique.}, language = {en} } @article{SoutoRodriguezMendezPenacoradaetal.1997, author = {Souto, Jorge and Rodriguez-Mendez, Maria-Luisa and Penacorada, Florencio and Reiche, J{\"u}rgen}, title = {Small angle x-ray reflectivity study of Langmuir-Blodgett films of a peripherally substituted zinc phthalocyanine}, year = {1997}, abstract = {Langmuir-Blodgett films of zinc 11,18,25-tri(tert-butyl)-4-sulfo-phthalocyanine (ZNPctSO3Na) have been deposited onto hydrophilic and hydrophobic silicon wafers. Y-type films were formed on both types of substrate, and the transfer ratio was very close to unity. The organization of the films on the molecular level was probed by X-ray specular reflectivity.}, language = {en} } @article{ReicheSchulzKnochenhaueretal.1997, author = {Reiche, J{\"u}rgen and Schulz, Burkhard and Knochenhauer, Gerald and Dietzel, Birgit and Freydank, Anke-Christine and Zetzsche, Thomas and Brehmer, Ludwig}, title = {Supramolecular structures formed from heterocyclic aromatic molecules}, year = {1997}, abstract = {This paper describes the formation and structure investigation of Langmuir monolayers and Langmuir-Blodgett multilayers formed from amphiphilic derivatives of 2,5-diphenyl-1,3,4-oxadiazole. The 2,5-diphenyl-1,3,4-oxadiazole group as a functional unit with interesting physical and chemical properties is maintained, while the head group, the length of the alkyl chain and the structure of the coupling unit between aromatic and aliphatic part of these linear short-chain amphiphiles is systematically varied in order to explore the influence of this change on the film forming properties and the stability of Langmuir and Langmuir-Blodgett films. Molecular mechanics simulations are shown by these systematic variations to be suitable for the prediction of optimal chemical structures allowing for a stable stratified molecular packing. The combination of a detailed structure investigation of the multilayers based on scanning force microscopy and X-ray data with molecular mechanics simulations yields an insight into the packing of the molecules and the intermolecular interactions.}, language = {en} } @article{PenacoradaReicheZetzscheetal.1997, author = {Penacorada, Florencio and Reiche, J{\"u}rgen and Zetzsche, Thomas and Dietel, Reinhard and Brehmer, Ludwig and Saja, Jose-Antonio de}, title = {Stabilisation of fatty acid mono- and multilayers by simultaneous polyelectrolyte complexation and salt formation with cadmium ions}, year = {1997}, abstract = {The complexation of highly ordered fatty acid monolayers with polyelectrolytes is expected to yield well- ordered Langmuir films suitable for the formation of Langmuir-Blodgett multilayers with improved long-term stability. Studies of the surface pressure-area isotherms and of the surface potential kinetics yield detailed information regarding the influence of these polymeric counterions on the monolayer properties. The injection of bivalent metal salts into the subphase after the complexation was used to improve the order and stability of the mono- and multilayers. The corresponding Langmuir-Blodgett films were investigated by means of X-ray reflectivity measurements and scanning force microscopy. The polyion complex multilayers show a strongly increased mechanical stability compared with films of fatty acid salts formed with bivalent metal ions. These structures are expected to be suitable as ultrathin separation layer for gas separation or ultrafiltration membranes.}, language = {en} } @article{HegerJeanninLangeretal.1997, author = {Heger, Alexander and Jeannin, Laurent and Langer, Norbert and Baraffe, Isabelle}, title = {Pulsations in red supergiants with high L/M ratio : implications for the stellar and circumstellar structure of supernova progenitors}, year = {1997}, language = {en} } @article{Langer1997, author = {Langer, Norbert}, title = {The Eddington limit in rotating massive stars}, year = {1997}, language = {en} } @article{LangerHeerFliegner1997, author = {Langer, Norbert and Heer, A. and Fliegner, Jana Ute}, title = {Rotation : a fundamental parameter of massive stars}, year = {1997}, language = {en} } @article{PenaHamannKoesterkeetal.1997, author = {Pena, M. and Hamann, Wolf-Rainer and Koesterke, Lars and Maza, J. and Mendez, R. H. and Peimbert, M. and Ruiz, M. T. and Torres-Peimbert, S.}, title = {HST spectrophotometric data of the central star of the planetary nebula LMC-N66}, year = {1997}, language = {en} } @article{KoesterkeHamann1997, author = {Koesterke, Lars and Hamann, Wolf-Rainer}, title = {Quantitative spectral analyses of CSPNs of early [WC]-type}, year = {1997}, language = {en} } @article{Hamann1997, author = {Hamann, Wolf-Rainer}, title = {Spectra of Wolf-Rayet type central stars and their analysis}, year = {1997}, language = {en} } @article{PenaHamannKoesterkeetal.1997, author = {Pena, M. and Hamann, Wolf-Rainer and Koesterke, Lars and Maza, J. and Mendez, R. H. and Peimbert, M. and Ruiz, M. T. and Torres-Peimbert, S.}, title = {Spectrophotometric data of the central star of the large magellanic cloud planetary nebula N66. Quantitative analysis of its WN type spectrum}, year = {1997}, language = {en} } @article{DreizlerWernerRauchetal.1997, author = {Dreizler, S. and Werner, Klaus and Rauch, Thomas and Koesterke, Lars and Heber, Ulrich}, title = {NLTE Analyses of PG 1159 stars : Contraints for the structure and evolutiuon of Post-AGB stars}, year = {1997}, language = {en} } @article{OsterbartLangerWeigelt1997, author = {Osterbart, R. and Langer, Norbert and Weigelt, G.}, title = {High-resolution imaging of the bipola Red Rectangle}, year = {1997}, language = {en} } @article{KoesterkeHamann1997, author = {Koesterke, Lars and Hamann, Wolf-Rainer}, title = {Spectral analyses of central of planetary nebulae of early WC-type / NGC 6751 and Sanduleak 3}, year = {1997}, language = {en} } @article{MikelskisSeifertWinter1997, author = {Mikelskis, Helmut and Seifert, Silke and Winter, Rolf}, title = {Der Computer - ein multimediales Werkzeug zum Lernen von Physik. - T. 3 : Videoanalyse von Wurf- und Kreisbewegungen im Alltag mit CUPLE, VIDEOPOINT und EXEL}, year = {1997}, language = {de} } @article{Mikelskis1997, author = {Mikelskis, Helmut}, title = {Grenz{\"u}berschreitender Physikunterricht - am Beispiel Farben}, isbn = {3-88064-269-9}, year = {1997}, language = {de} } @article{PietschBarberkaGeueetal.1997, author = {Pietsch, Ullrich and Barberka, Thomas Andreas and Geue, Thomas and St{\"o}mmer, Ralph}, title = {X-ray scattering from thin organic films and multilayers}, year = {1997}, language = {en} } @article{EnglischGutberletSeitzetal.1997, author = {Englisch, Uwe and Gutberlet, T. and Seitz, R. and Oeser, R. and Pietsch, Ullrich}, title = {Thermally induced rearrangement of fatty acid salt molecules in Langmuir-Blodgett multilayers}, year = {1997}, language = {en} } @article{DarowskiPaschkePietschetal.1997, author = {Darowski, Nora and Paschke, K. and Pietsch, Ullrich and Wang, K. H. and Forchel, Alfred and Baumbach, Tilo and Zeimer, Ute}, title = {Identification of a buried single quantum well within surface structurized semiconductors using depth resolved x-ray grazing-incidence diffraction}, year = {1997}, language = {en} } @article{RosePietschZeimer1997, author = {Rose, Dirk and Pietsch, Ullrich and Zeimer, Ute}, title = {Characterization of InGaAs single quantum wells buried in GaAs[001] by grazing incidence diffraction}, year = {1997}, language = {en} } @article{BolmEnglischPenacoradaetal.1997, author = {Bolm, A. and Englisch, Uwe and Penacorada, Florencio and Gerstenberger, M. and Pietsch, Ullrich}, title = {Temperature and time dependent investigations of cd- and uranyl-stearate multilayers by means of neutron reflectivity measurements}, year = {1997}, language = {en} } @article{HerrmannKauppGeueetal.1997, author = {Herrmann, A. and Kaupp, G. and Geue, Thomas and Pietsch, Ullrich}, title = {AFM and GID investigations of the gas-solid diazotation of 4-sulfanil-acid-monohydrat single crystals}, year = {1997}, language = {en} } @article{PaschkeGeueBarberkaetal.1997, author = {Paschke, K. and Geue, Thomas and Barberka, Thomas Andreas and Bolm, A. and Pietsch, Ullrich and R{\"o}sch, M. and Batke, Edwin and Faller, F. and Kerkel, K. and Oshiniwo, J. and Forchel, Alfred}, title = {Characterization of lateral semiconductor nano structures by means of x-ray grazing-incidence diffraction}, year = {1997}, language = {en} } @article{SiebrechtSchreyerEnglischetal.1997, author = {Siebrecht, R. and Schreyer, A. and Englisch, Uwe and Pietsch, Ullrich and Zabel, Hartmut}, title = {The new reflectometer ADAM at the ILL}, year = {1997}, language = {en} } @article{WilkensWeiss1997, author = {Wilkens, Martin and Weiss, Christoph}, title = {Particle number fluctuations in an ideal Bose gas}, year = {1997}, abstract = {We analyse occupation number fluctuations of an ideal Bose gas in a trap which is isolated from theenvironment with respect to particle exchange (canonical ensemble). We show that in contrast to the predictions of thegrand- canonical ensemble, the counting statistics of particles in the trap ground state changes from monotonously decreasing above the condensation temperature to single-peaked below that temperature. For the exactly solvable case of a harmonic oscillator trapping potential in one spatial dimension we extract a Landau-Ginzburg functional which - despite the non- interacting nature of the system - displays the characteristic behaviour of a weakly interacting Bose gas. We also compare our findings with the usual treatment which is base on the grand-canonical ensemble. We show that for an ideal Bose gas neither are the grand-canonical and canonical ensemble thermodynamically equivalent, nor the grand-canonical ensemble can be viewed as a small system in diffusive contact with a particle reservoir.}, language = {en} } @article{StenholmWilkens1997, author = {Stenholm, Stig and Wilkens, Martin}, title = {Jumps in quantum theory}, year = {1997}, abstract = {In this paper we review the discussion about quantum jumps. We sketch the historical background before we present the recent revival of this problem originating in the field of atomic investigations. We present both the theoretical methods and their motivations, the relevance to experiments and an attempt at a preliminary discussion of the role of these developments in our fundamental understanding of quantum physics.}, language = {en} } @article{Mikelskis1997, author = {Mikelskis, Helmut}, title = {Der Computer - ein multimediales Werkzeug zum Lernen von Physik. - T. 6 : Multimedia- und Internetlernen im Physikunterricht?}, year = {1997}, language = {de} } @article{Mikelskis1997, author = {Mikelskis, Helmut}, title = {Der Computer - ein multimediales Werkzeug zum Lernen von Physik. - T. 5 : Transzendenz von Realerfahrungen und Visualisierung von Modellvorstellungen zur optischen Brechung durch die Simulationssoftware phenOpt}, year = {1997}, language = {de} } @article{MikelskisSeifertWinter1997, author = {Mikelskis, Helmut and Seifert, Silke and Winter, Rolf}, title = {Der Computer - ein multimediales Werkzeug zum Lernen von Physik. - T. 4 : Videoanalyse von Schlag- und Stoßvorg{\"a}ngen im Sport mit VIDEOPOINT und DAVID}, year = {1997}, language = {de} } @article{MikelskisKrahmerWinter1997, author = {Mikelskis, Helmut and Krahmer, P. and Winter, Rolf}, title = {Der Computer - ein multimediales Werkzeug zum Lernen von Physik. - T. 2 : Das Projekt GALILEO ; Videoanalyse von Bewegungsvorg{\"a}ngen}, year = {1997}, language = {de} } @article{MikelskisSeifertWinter1997, author = {Mikelskis, Helmut and Seifert, Silke and Winter, Rolf}, title = {Der Computer - ein multimediales Werkzeug zum Lernen von Physik. - T. 1 : Multimedia und Hypermedia im Physikunterricht ; eine einf{\"u}hrende {\"U}bersicht}, year = {1997}, language = {de} } @article{OstermeyerMenzel1997, author = {Ostermeyer, Martin and Menzel, Ralf}, title = {34 Watt flash lamp pumped single rod ND:YAG laser with 1.2 * DL beam quality via special resonator design}, year = {1997}, language = {en} } @article{HeuerHodgsonLorenzetal.1997, author = {Heuer, Axel and Hodgson, N. and Lorenz, Dieter and Ostermeyer, Martin and Menzel, Ralf}, title = {Solid state lasers with high brightness via optical phase conjugation for micromachining}, year = {1997}, language = {en} } @article{MittlerOstermeyerHeueretal.1997, author = {Mittler, Kay and Ostermeyer, Martin and Heuer, Axel and Menzel, Ralf}, title = {Longitudinal mode structure of Nd-lasers with phase conjugating mirrors based on stimulated Brillouin scattering in different materials}, year = {1997}, language = {en} } @article{OstermeyerLorenzMenzel1997, author = {Ostermeyer, Martin and Lorenz, Dieter and Menzel, Ralf}, title = {Nd-laser oscillators with phase-conjugating SBS mirrors for high average output powers and fundamental mode operation}, year = {1997}, language = {en} } @article{OstermeyerLorenzHodgsonetal.1997, author = {Ostermeyer, Martin and Lorenz, Dieter and Hodgson, N. and Menzel, Ralf}, title = {Transverse Modes in Laser Resonators with Phase Conjugating Mirror Based on Stimulated Brillouin Scattering (SBS)}, year = {1997}, language = {en} } @article{WeissWilkens1997, author = {Weiss, Christoph and Wilkens, Martin}, title = {Particle number counting statistics in ideal Bose gases}, year = {1997}, abstract = {We discuss the exact particle number counting statistics of degenerate ideal Bose gases in the microcanonical, canonical, and grand-canonical ensemble, respectively, for various trapping potentials. We then invoke the Maxwell's Demon ensemble [P. Navez et al., Phys. Rev. Lett.(1997)] and show that for large total number of particles the root-mean-square fluctuation of the condensate occupation scales delta n0 proportional to [T/Tc]r Ns with scaling exponents r=3/2, s=1/2 for the 3D harmonic oscillator trapping potential, and r=1, s=2/3 for the 3D box. We derive an explicit expression for r and s in terms of spatial dimension D and spectral index sigma of the single- particle energy spectrum. Our predictions also apply to systems where Bose-Einstein condensation does not occur. We point out that the condensate fluctuations in the microcanonical and canonical ensemble respect the principle of thermodynamic equivalence.}, language = {en} } @article{RosenblumPikovskijKurths1997, author = {Rosenblum, Michael and Pikovskij, Arkadij and Kurths, J{\"u}rgen}, title = {Phase synchronization in noisy and chaotic oscillators}, year = {1997}, language = {en} } @article{RosenblumPikovskijKurths1997, author = {Rosenblum, Michael and Pikovskij, Arkadij and Kurths, J{\"u}rgen}, title = {Effect of phase synchronization in driven chaotic oscillators}, year = {1997}, language = {en} }