TY  - JOUR
A1  - Müller, Wieland
T1  - Die solare Strahlung : durch Physik und Medizin neue Einsichten in unsere Umwelt gewinnen
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Mikelskis, Helmut
T1  - Die Polarität von Umweltbildung im Physikunterricht
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Haase, Alfred
A1  - Menzel, Ralf
T1  - High beam quality of a single rod neodym amplifier by SBS-phase conjugation up to 140 watt average output
Y1  - 1996
ER  - 
TY  - BOOK
ED  - Neißendorfer, Frank
T1  - BESSY Jahresberichte (1990) - (1995)
Y1  - 1996
PB  - BESSY
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Feudel, Fred
A1  - Seehafer, Norbert
A1  - Schmidtmann, Olaf
T1  - Bifurcation phenomena of the magnetofluid equations
N2  - We report on bifurcation studies for the incompressible magnetohydrodynamic equations in three space dimensions with periodic boundary conditions and a temporally constant external forcing. Fourier representations of velocity, pressure and magnetic field have been used to transform the original partial differential equations into systems of ordinary differential equations (ODE), to which then special numerical methods for the qualitative analysis of systems of ODE have been applied, supplemented by the simulative calculation of solutions for selected initial conditions. In a part of the calculations, in order to reduce the number of modes to be retained, the concept of approximate inertial manifolds has been applied. For varying (increasing from zero) strength of the imposed forcing, or varying Reynolds number, respectively, time-asymptotic states, notably stable stationary solutions, have been traced. A primary non- magnetic steady state loses, in a Hopf bifurcation, stability to a periodic state with a non-vanishing magnetic field, showing the appearance of a generic dynamo effect. From now on the magnetic field is present for all values of the forcing. The Hopf bifurcation is followed by further, symmetry-breaking, bifurcations, leading finally to chaos. We pay particular attention to kinetic and magnetic helicities. The dynamo effect is observed only if the forcing is chosen such that a mean kinetic helicity is generated; otherwise the magnetic field diffuses away, and the time-asymptotic states are non-magnetic, in accordance with traditional kinematic dynamo theory.
Y1  - 1996
UR  - http://www.mathematicsweb.org/mathematicsweb/show/Index.htt?Issn=03784754
ER  - 
TY  - BOOK
A1  - Duit, Reinders
A1  - Mikelskis, Helmut
T1  - Physik, um die Welt zu begreifen : ein Lehrbuch für die Jahrgangsstufe 9/10 ; [Hauptbd.], Nordrhein- Westfalen
Y1  - 1996
SN  - 3-425-03673-4
PB  - Diesterweg [u.a.]
CY  - Frankfurt am Main [u.a.]
ER  - 
TY  - JOUR
A1  - Höpfner, Ulf
A1  - Frübing, Peter
A1  - Neumann, Werner
A1  - Kaminorz, Yvette
A1  - Brehmer, Ludwig
T1  - Polarization Processes of poly(DMDAAC) films studied by TSD current
Y1  - 1996
ER  - 
TY  - THES
A1  - Brügmann, Bernd
T1  - Quantum gravity in four dimensions : canonical quantization and dynamical triangulations
Y1  - 1996
ER  - 
TY  - THES
A1  - Braun, Michael
T1  - Sternentstehung in irregulären Galaxien : UGCA 86 und die Magellanschen Wolken
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Krampe, Ralf-Thomas
A1  - Schwarz, Udo
A1  - Witt, Annette
T1  - Measures of complexity in signal analysis
Y1  - 1996
UR  - http://agnld.uni-potsdam.de/~shw/Paper/m.ps.gz
ER  - 
TY  - JOUR
A1  - Osipov, Grigory V.
A1  - Rosenblum, Michael
A1  - Pikovskij, Arkadij
A1  - Zaks, Michael A.
A1  - Kurths, Jürgen
T1  - Attractor-repeller collision and eyelet intermittency at the transition to phase synchronization
N2  - The chaotically driven circle map is considered as the simplest model ofphase synchronization of a chaotic continuous-time oscillator by external periodic force. The phase dynamics is analyzed via phase-locking regions of the periodic cycles embedded in the strange attractor. It is shown that full synchronization, where all the periodic cycles are phase locked, disappears via the attractor-repeller collision. Beyond the transition an intermittent regime with exponentially rare phase slips, resulting from the trajectory's hits on an eyelet, is observed.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Gowin, W.
A1  - Kurths, Jürgen
A1  - Saparin, Peter
A1  - Felsenberg, D.
T1  - Measures of complexity and processing of vertebral CT-images
Y1  - 1997
SN  - 0-7803-4262-3
ER  - 
TY  - JOUR
A1  - Scholl, H.
A1  - Spahn, Frank
A1  - Hertzsch, Jan-Martin
A1  - Katzorke, Ines
T1  - Simulation of collisions in planetary rings
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Pikovskij, Arkadij
A1  - Rosenblum, Michael
A1  - Osipov, Grigory V.
A1  - Kurths, Jürgen
T1  - Phase synchronization effects in a lattice of nonidentical Rössler oscillators
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Rosenblum, Michael
A1  - Osipov, Grigory V.
A1  - Pikovskij, Arkadij
A1  - Kurths, Jürgen
T1  - Phase synchronization of chaotic oscillators by external driving
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Feudel, Ulrike
A1  - Jansen, Wolfgang
A1  - Kurths, Jürgen
A1  - Schwarz, Udo
A1  - Voss, Henning U.
T1  - Solar variability : simple models and proxy data
Y1  - 1997
SN  - 4-274-90187-4
ER  - 
TY  - JOUR
A1  - Yilmaz, Sükrü
A1  - Wirges, Werner
A1  - Bauer-Gogonea, Simona
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
A1  - Michelotti, F.
A1  - Toussaere, E.
A1  - Levenson, R.
A1  - Liang, J.
A1  - Zyss, Joseph
T1  - Dielectric, pyroelectric and electro-optic monitoring of the cross-linking process and photo-induced poling of Red Acid Magly
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Zaikin, Alexei A.
A1  - Rosenblum, Michael
A1  - Scheffczyk, Christian
A1  - Engbert, Ralf
A1  - Krampe, Ralf-Thomas
A1  - Kurths, Jürgen
T1  - Modeling qualitative changes in bimanual movements
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schiek, Michael
A1  - Scheffczyk, Christian
A1  - Engbert, Ralf
A1  - Kurths, Jürgen
A1  - Krampe, Ralf-Thomas
A1  - Kliegl, Reinhold
A1  - Drepper, Friedhelm R.
T1  - Symbolic dynamics of physiological synchronisation : examples from bimanual movements and cardiorespiratory interaction
N2  - Key words: Nonlinear time series analysis, symbolic dynamics, phase transitions, physiological data, biological synchronization, production of polyrhythms, cardiorespiratory interaction, variation of control parameter
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Scheffczyk, Christian
A1  - Krampe, Ralf-Thomas
A1  - Engbert, Ralf
A1  - Rosenblum, Michael
A1  - Kurths, Jürgen
A1  - Kliegl, Reinhold
T1  - Tempo-induced transitions in polyrhythmic hand movements
N2  - 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.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Papra, Alex
A1  - Penacorada, Florencio
A1  - Reiche, Jürgen
A1  - Katholy, Stefan
A1  - Brehmer, Ludwig
A1  - Hicke, Hans-Georg
T1  - Structure and Stability of Langmuir Monolayers and Langmuir-Blodgett Films of Bisaroyl Azide Bolaamphiphiles
N2  - 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
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Wessel, Niels
A1  - Kleiner, H. J.
A1  - Voss, Andreas
A1  - Kurths, Jürgen
A1  - Dietz, R.
T1  - Nonlinear dynamics in cardiovasscular diseases
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Zaks, Michael A.
A1  - Rosenblum, Michael
A1  - Pikovskij, Arkadij
A1  - Osipov, Grigory V.
A1  - Kurths, Jürgen
T1  - Phase synchronization of chaotic oscillations in terms of periodic orbits
Y1  - 1997
SN  - 1054-1500
ER  - 
TY  - JOUR
A1  - Zaikin, Alexei A.
A1  - Rosenblum, Michael
A1  - Landa, Polina S.
A1  - Kurths, Jürgen
T1  - Control of noise-induced oscillations of a pendulum with a rondomly vibrating suspension axis
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Kuznetsov, Sergey P.
A1  - Pikovskij, Arkadij
A1  - Bezrucko, B. P.
A1  - Seleznev, E. P.
A1  - Feudel, Ulrike
T1  - O dinamike nelinejnych sistem po vne¬nim kvaziperiodi§eskim vozdejstviem vblizi to§ki okon§anija linii bifurkatcii udvoenija tora
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Hunt, Brain R.
A1  - Grebogi, Celso
A1  - Barreto, Ernest
A1  - Yorke, James A.
T1  - From high dimensional chaos to stable periodic orbits : the structure of parameter space
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Saparin, Peter
A1  - Kurths, Jürgen
A1  - Gowin, P.
A1  - Felsenberg, D.
T1  - Die quantitative Beurteilung trabeculärer Knochenstrukturen der Lendenwirbelkörper durch Meßmethoden der nicht-linearen Dynamik
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Knochenhauer, Gerald
A1  - Dietel, Reinhard
A1  - Freydank, Anke-Christine
A1  - Zetzsche, Thomas
A1  - Pietsch, Ullrich
A1  - Brehmer, Ludwig
A1  - Barberka, Thomas Andreas
A1  - Geue, Thomas
T1  - Structure of thermally treated oxadiazoleamide Langmuir-Blodgett films
N2  - 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.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Penacorada, Florencio
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
A1  - Brehmer, Ludwig
T1  - Monolayers and multilayers of uranyl arachidate : in-plane structure of uranyl arachidate multilayers
N2  - 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.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Souto, Jorge
A1  - Rodriguez-Mendez, Maria-Luisa
A1  - Penacorada, Florencio
A1  - Reiche, Jürgen
T1  - Small angle x-ray reflectivity study of Langmuir-Blodgett films of a peripherally substituted zinc phthalocyanine
N2  - 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.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Schulz, Burkhard
A1  - Knochenhauer, Gerald
A1  - Dietzel, Birgit
A1  - Freydank, Anke-Christine
A1  - Zetzsche, Thomas
A1  - Brehmer, Ludwig
T1  - Supramolecular structures formed from heterocyclic aromatic molecules
N2  - 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.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Penacorada, Florencio
A1  - Reiche, Jürgen
A1  - Zetzsche, Thomas
A1  - Dietel, Reinhard
A1  - Brehmer, Ludwig
A1  - Saja, Jose-Antonio de
T1  - Stabilisation of fatty acid mono- and multilayers by simultaneous polyelectrolyte complexation and salt formation with cadmium ions
N2  - 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.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Heger, Alexander
A1  - Jeannin, Laurent
A1  - Langer, Norbert
A1  - Baraffe, Isabelle
T1  - Pulsations in red supergiants with high L/M ratio : implications for the stellar and circumstellar structure of supernova progenitors
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Langer, Norbert
T1  - The Eddington limit in rotating massive stars
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Langer, Norbert
A1  - Heer, A.
A1  - Fliegner, Jana Ute
T1  - Rotation : a fundamental parameter of massive stars
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Pena, M.
A1  - Hamann, Wolf-Rainer
A1  - Koesterke, Lars
A1  - Maza, J.
A1  - Mendez, R. H.
A1  - Peimbert, M.
A1  - Ruiz, M. T.
A1  - Torres-Peimbert, S.
T1  - HST spectrophotometric data of the central star of the planetary nebula LMC-N66
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Koesterke, Lars
A1  - Hamann, Wolf-Rainer
T1  - Quantitative spectral analyses of CSPNs of early [WC]-type
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Hamann, Wolf-Rainer
T1  - Spectra of Wolf-Rayet type central stars and their analysis
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Pena, M.
A1  - Hamann, Wolf-Rainer
A1  - Koesterke, Lars
A1  - Maza, J.
A1  - Mendez, R. H.
A1  - Peimbert, M.
A1  - Ruiz, M. T.
A1  - Torres-Peimbert, S.
T1  - Spectrophotometric data of the central star of the large magellanic cloud planetary nebula N66. Quantitative analysis of its WN type spectrum
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Dreizler, S.
A1  - Werner, Klaus
A1  - Rauch, Thomas
A1  - Koesterke, Lars
A1  - Heber, Ulrich
T1  - NLTE Analyses of PG 1159 stars : Contraints for the structure and evolutiuon of Post-AGB stars
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Osterbart, R.
A1  - Langer, Norbert
A1  - Weigelt, G.
T1  - High-resolution imaging of the bipola Red Rectangle
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Koesterke, Lars
A1  - Hamann, Wolf-Rainer
T1  - Spectral analyses of central of planetary nebulae of early WC-type / NGC 6751 and Sanduleak 3
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Mikelskis, Helmut
A1  - Seifert, Silke
A1  - Winter, Rolf
T1  - Der Computer - ein multimediales Werkzeug zum Lernen von Physik. - T. 3 : Videoanalyse von Wurf- und Kreisbewegungen im Alltag mit CUPLE, VIDEOPOINT und EXEL
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Mikelskis, Helmut
T1  - Grenzüberschreitender Physikunterricht - am Beispiel Farben
Y1  - 1997
SN  - 3-88064-269-9
ER  - 
TY  - JOUR
A1  - Pietsch, Ullrich
A1  - Barberka, Thomas Andreas
A1  - Geue, Thomas
A1  - Stömmer, Ralph
T1  - X-ray scattering from thin organic films and multilayers
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Englisch, Uwe
A1  - Gutberlet, T.
A1  - Seitz, R.
A1  - Oeser, R.
A1  - Pietsch, Ullrich
T1  - Thermally induced rearrangement of fatty acid salt molecules in Langmuir-Blodgett multilayers
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Darowski, Nora
A1  - Paschke, K.
A1  - Pietsch, Ullrich
A1  - Wang, K. H.
A1  - Forchel, Alfred
A1  - Baumbach, Tilo
A1  - Zeimer, Ute
T1  - Identification of a buried single quantum well within surface structurized semiconductors using depth resolved x-ray grazing-incidence diffraction
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Rose, Dirk
A1  - Pietsch, Ullrich
A1  - Zeimer, Ute
T1  - Characterization of InGaAs single quantum wells buried in GaAs[001] by grazing incidence diffraction
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Bolm, A.
A1  - Englisch, Uwe
A1  - Penacorada, Florencio
A1  - Gerstenberger, M.
A1  - Pietsch, Ullrich
T1  - Temperature and time dependent investigations of cd- and uranyl-stearate multilayers by means of neutron reflectivity measurements
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Herrmann, A.
A1  - Kaupp, G.
A1  - Geue, Thomas
A1  - Pietsch, Ullrich
T1  - AFM and GID investigations of the gas-solid diazotation of 4-sulfanil-acid-monohydrat single crystals
Y1  - 1997
ER  -