TY  - JOUR
A1  - Gebert, Horst
A1  - Kretzschmar, Wolfgang
A1  - Regenstein, Wolfgang
T1  - Ground-state complex formation of perylene with pyromellitic dianhydride studied by static fluorescence quenching
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Regenstein, Wolfgang
A1  - Gebert, Horst
A1  - Kretzschmar, Wolfgang
T1  - Charge transfer interaction and static quenching
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Koesterke, Lars
A1  - Dreizler, S.
A1  - Rauch, Thomas
T1  - On the mass-loss of PG 1159 stars
Y1  - 1998
ER  - 
TY  - INPR
A1  - Volosevich, Alexandra V.
A1  - Meister, Claudia-Veronika
T1  - Nonlinear interaction of Farley-Buneman waves
N2  - The nonlinear interaction of waves excited by the modified two-stream instability (Farley-Buneman instability) is considered. It is found that, during the linear stage of wave growth, the enhanced pressure of the high-frequency part of the waves locally generates a ponderomotive force. This force acts on the plasma particles and redistributes them. Thus an additional electrostatic polarization field occurs, which influences the low-frequency part of the waves. Then, the low-frequency waves also cause a redistribution of the high-frequency waves. In the paper, a self-consistent system of equations is obtained, which describes the nonlinear interaction of the waves. It is shown that the considered mechanism of wave interaction causes a nonlinear stabilization of the high-frequency waves’ growth and a formation of local density structures of the charged particles. The density modifications of the charged particles during the non-linear stage of wave growth and the possible interval of aspect angles of the high-frequency waves are estimated.
T3  - NLD Preprints - 52 
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14851
ER  - 
TY  - INPR
A1  - Braun, Robert
A1  - Feudel, Fred
A1  - Guzdar, Parvez
T1  - The route to chaos for a two-dimensional externally driven flow
N2  - We have numerically studied the bifurcations and transition to chaos in a two-dimensional fluid for varying values of the Reynolds number. These investigations have been motivated by experiments in fluids, where an array of vortices was driven by an electromotive force. In these experiments, successive changes leading to a complex motion of the vortices, due to increased forcing, have been explored [Tabeling, Perrin, and Fauve, J. Fluid Mech. 213, 511 (1990)]. We model this experiment by means of two-dimensional Navier-Stokes equations with a special external forcing, driving a linear chain of eight counter-rotating vortices, imposing stress-free boundary conditions in the vertical direction and periodic boundary conditions in the horizontal direction. As the strength of the forcing or the Reynolds number is raised, the original stationary vortex array becomes unstable and a complex sequence of bifurcations is observed. Several steady states and periodic branches and a period doubling cascade appear on the route to chaos. For increasing values of the Reynolds number, shear flow develops, for which the spatial scale is large compared to the scale of the forcing. Furthermore, we have investigated the influence of the aspect ratio of the container as well as the effect of no-slip boundary conditions at the top and bottom, on the bifurcation scenario.
T3  - NLD Preprints - 46 
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14717
ER  - 
TY  - INPR
A1  - Lukaschewitsch, Michael
T1  - Geoelectrical conductivity problems on unbounded domains
N2  - This paper deals with the electrical conductivity problem in geophysics. It is formulated as an elliptic boundary value problem of second order for a large class of bounded and unbounded domains. A special boundary condition, the so called "Complete Electrode Model", is used. Poincaré inequalities are formulated and proved in the context of weighted Sobolev spaces, leading to existence and uniqueness statements for the boundary value problem. In addition, a parameter-to-solution operator arising from the inverse conductivity problem in medicine (EIT) and geophysics is investigated mathematically and is shown to be smooth and analytic.
T3  - NLD Preprints - 45 
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14704
ER  - 
TY  - INPR
A1  - Maaß, Peter
A1  - Pereverzev, Sergei V.
A1  - Ramlau, Ronny
A1  - Solodky, Sergei G.
T1  - An adaptive discretization for Tikhonov-Phillips regularization with a posteriori parameter selection
N2  - The aim of this paper is to describe an efficient strategy for descritizing ill-posed linear operator equations of the first kind: we consider Tikhonov-Phillips-regularization χ^δ α = (a * a + α I)^-1 A * y ^δ with a finite dimensional approximation A n instead of A. We propose a sparse matrix structure which still leads to optimal convergences rates but requires substantially less scalar products for computing A n compared with standard methods.
T3  - NLD Preprints - 48 
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14739
ER  - 
TY  - INPR
A1  - Seehafer, Norbert
A1  - Schumacher, Jörg
T1  - Resistivity profile and instability of the plane sheet pinch
N2  - The stability of the quiescent ground state of an incompressible, viscous and electrically conducting fluid sheet, bounded by stress-free parallel planes and driven by an external electric field tangential to the boundaries, is studied numerically. The electrical conductivity varies as cosh–2(x1/a), where x1 is the cross-sheet coordinate and a is the half width of a current layer centered about the midplane of the sheet. For a <~ 0.4L, where L is the distance between the boundary planes, the ground state is unstable to disturbances whose wavelengths parallel to the sheet lie between lower and upper bounds depending on the value of a and on the Hartmann number. Asymmetry of the configuration with respect to the midplane of the sheet, modelled by the addition of an externally imposed constant magnetic field to a symmetric equilibrium field, acts as a stabilizing factor.
T3  - NLD Preprints - 44 
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14686
ER  - 
TY  - INPR
A1  - Rüdiger, Sten
A1  - Feudel, Fred
A1  - Seehafer, Norbert
T1  - Dynamo bifurcations in an array of driven convection-like rolls
N2  - The bifurcations in a three-dimensional incompressible, electrically conducting fluid with an external forcing of the Roberts type have been studied numerically. The corresponding flow can serve as a model for the convection in the outer core of the Earth and is realized in an ongoing laboratory experiment aimed at demonstrating a dynamo effect. The symmetry group of the problem has been determined and special attention has been paid to symmetry breaking by the bifurcations. The nonmagnetic, steady Roberts flow loses stability to a steady magnetic state, which in turn is subject to secondary bifurcations. The secondary solution branches have been traced until they end up in chaotic states.
T3  - NLD Preprints - 43 
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14678
ER  - 
TY  - JOUR
A1  - Rüdiger, Sten
A1  - Feudel, Fred
A1  - Seehafer, Norbert
T1  - Dynamo bifurcations in an array of driven convectionlike rolls
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Seehafer, Norbert
A1  - Feudel, Fred
A1  - Galanti, B.
T1  - Bifurcations in a magnetofluid with helical forcing
Y1  - 1998
SN  - 1-563-47284-8
ER  - 
TY  - JOUR
A1  - Seehafer, Norbert
T1  - Filaments and the solar dynamo
Y1  - 1998
SN  - 1-88673-370-8
ER  - 
TY  - JOUR
A1  - Schmidtmann, Olaf
A1  - Feudel, Fred
A1  - Seehafer, Norbert
T1  - Nonlinear Galerkin methods based on the concept of determining modes for the magnetohydrodynamic equations
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Zienicke, Egbert
A1  - Seehafer, Norbert
A1  - Feudel, Fred
T1  - Bifurcations in two-dimensional Rayleigh-Bénard convection
Y1  - 1998
ER  - 
TY  - BOOK
A1  - Rüdiger, Sten
A1  - Feudel, Fred
A1  - Seehafer, Norbert
T1  - Dynamo bifurcations in an array of driven convectionlike rolls
T3  - Preprint NLD
Y1  - 1998
SN  - 1432-2935
VL  - 43
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Seehafer, Norbert
A1  - Schumacher, Jörg
T1  - Resistivity profile and instability of the plane sheet pinch
Y1  - 1998
ER  - 
TY  - BOOK
A1  - Seehafer, Norbert
A1  - Schumacher, Jörg
T1  - Resistivity profile and instability of the plane sheet pinch
T3  - Preprint NLD
Y1  - 1998
SN  - 1432-2935
VL  - 44
PB  - Univ. Potsdam
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Janicke, U.
A1  - Wilkens, Martin
T1  - Atomic matter wave amplification by optical pumping
N2  - The atom laser (or `Boser') is a device that delivers a beam of atomic de Broglie waves with high coherence and monochromaticity. In this review, we concentrate on an all-optical scheme of an atom laser that is based on optical pumping. The model is first presented in terms of kinetic equations, and its relation to the ordinary laser and the Bose-Einstein condensation is discussed. We then derive a master equation for the quantum statistics dynamics of the atom laser. Neglecting photon reabsorption processes, the master equation is solved and the counting statistics is computed. Finally, the effects of the inelastic reabsorption processes are investigated for the particular case of two atoms. It is shown that the onset of atom-lasing is suppressed in large resonators, but may be achieved in small and/or low-dimensional resonators.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Busch, Thomas
A1  - Englert, Bertold-Georg
A1  - Rzazewski, Kazimierz
A1  - Wilkens, Martin
T1  - Two cold atoms in a harmonic trap
N2  - Two ultracold atoms moving in a trap interact weakly at a very short distance. This interaction can be modeled by a properly regularized contact potential. We solve the corresponding time-independent Schrödinger equation under the assumption of a parabolic, spherically symmetric trapping potential.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Leonhardt, Ulf
A1  - Wilkens, Martin
T1  - Aharonov-Bohm scattering of neutral atoms
N2  - We study the scattering of quantum particles in the presence of an Aharonov-Bohm vortex and in an arbitrary cylindrically symmetric potential. In particular we address the scattering of atoms carrying dipole moments induced by an electrically charged wire and a homogeneous magnetic field. We argue that, despite the strong attraction of the wire, an Aharoniv-Bohm effect will be visible.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Wilkens, Martin
T1  - Quantum Phase of a Moving Dipole
N2  - It is shown that a neutral particle with an electric dipole moment which moves in a magnetic field acquires a topological phase. This phase may be observed in atom or molecular interferometry.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Javanainen, Juha
A1  - Wilkens, Martin
T1  - Phase and phase diffusion of a split Bose-Einstein condensate
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Henkel, Carsten
A1  - Courtois, J.-Y.
T1  - Recoil and momentum diffusion of an atom close to a vacuum-dielectric interface
N2  - We derive the quantum-mechanical master equation (generalized optical Bloch equation) for an atom in the vicinity of a flat dielectric surface. This equation gives access to the semiclassical radiation pressure force and the atomic momentum diffusion tensor, that are expressed in terms of the vacuum field correlation function (electromagnetic field susceptibility). It is demonstrated that the atomic center-of-mass motion provides a nonlocal probe of the electromagnetic vacuum fluctuations. We show in particular that in a circularly polarized evanescent wave, the radiation pressure force experienced by the atoms is not colinear with the evanescent wave's propagation vector. In a linearly polarized evanescent wave, the recoil per fluorescence cycle leads to a net magnetization for a Jg = 1/2 ground state atom.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Henkel, Carsten
A1  - Sandoghdar, Vahid
T1  - Single-molecule sprectroscopy near structured dielectrics
N2  - We present an analytical approach to the calculation of the linewidth and lineshift of an atom or molecule in the near field of a structured dielectric surface. For soft surface corrugations with amplitude lambda/50, we find variations of the linewidth in the ten percent region. More strikingly, the shift of the molecular resonance can reach several natural linewidths. We demonstrate that the lateral resolution is of the order of the molecule-surface distance. We give a semiquantitative explanation of the outcome of our calculations that is based on simple intuitive models.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Westbrook, N.
A1  - Henkel, Carsten
A1  - Westbrook, C. I.
A1  - Landragin, A.
A1  - Labeyrie, G.
A1  - Cognet, L.
A1  - Savalli, V.
A1  - Horvath, G.
A1  - Aspect, Alain
A1  - Moelmer, Klaus
A1  - Courtois, J.-Y.
A1  - Phillips, W. D.
A1  - Kaiser, Rolf
A1  - Bagnato, V.
T1  - New physics with evanescent wave atomic mirrors : the van der Waals force and atomic diffraction
N2  - After a brief introduction to the field of atom optics and to atomic mirrors, we present experimental results obtained in our group during the last two years while studying the reflection of rubidium atoms by an evanescent wave. These involve the first measurement of the van der Waals force between an atom in its ground state and a dielectric wall, as well as the demonstration of a reflection grating for atoms at normal incidence. We also consider the influence of quantum reflection and tunnelling phenomena. Further studies using the atomic mirror as a probe of the van der Waals interaction, and of very small surface roughness are briefly discussed.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Goldmann, Daniela
A1  - Mahlstedt, S.
A1  - Janietz, Dietmar
A1  - Busch, P.
A1  - Schmidt, C.
A1  - Stracke, A.
A1  - Wendorff, Joachim Heinz
T1  - Mesomorphic donor-acceptor twin molecules with covalently linked sheet-like pentaalkyne and nitrofluorenone subunits
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Goldmann, Daniela
A1  - Janietz, Dietmar
A1  - Schmidt, C.
A1  - Wendorff, Joachim Heinz
T1  - Liquid crystalline 1,3,5-triazines incorporating rod-like azobenzene sub-units
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
T1  - Supramolecular architectures for micro-sensorics and molecular electronics
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Driebe, Thomas
A1  - Blöcker, Thomas
A1  - Herwig, Falk
A1  - Schönberner, Detlef
T1  - Diffusive overshooting in hot bottom burning AGB models
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Makievski, A. V.
A1  - Fainerman, V. B.
A1  - Bree, M.
A1  - Wüstneck, Rainer
A1  - Krägel, Jürgen
A1  - Miller, Reinhard
T1  - Asdorption of proteins at the liquid/air interface
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Otto, Andreas H.
A1  - Steiger, Th.
A1  - Schrader, Sigurd
T1  - The gas phase acidity of trifluoromethanesulphonic acid : an ab initio MO and density functional theory study
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Lucht, Sylvia
A1  - Stumpe, Joachim
A1  - Rutloh, M.
T1  - Triple fluorescence of substituted benzanilides in solution and in solid states
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Langer, Norbert
A1  - Heger, Alexander
A1  - Garcia-Segura, Guillermo
T1  - Massive stars : the pre-supernova evolution of internal and circumstellar structure
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Langer, Norbert
A1  - Braun, H.
A1  - Wellstein, Stephan
T1  - Massive close binaries as source of galatic 26Al
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Koesterke, Lars
A1  - Werner, Klaus
T1  - Determination of mass-loss rates of PG 1159 stars from FUV spectroskopy
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Figer, Donald F.
A1  - Najarro, F.
A1  - Moris, Mark
A1  - Mclean, Ian S.
A1  - Geballe, T. R.
A1  - Ghez, A. M.
A1  - Langer, Norbert
T1  - The Pistol star
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Garcia-Segura, Guillermo
A1  - Langer, Norbert
A1  - Rozyczka, M.
A1  - MacLow, Mordecai-Mark
T1  - The effects of rotation and stellar magnetic fields on the nebular shapes : LBV nebulae and PNe
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Heger, Alexander
A1  - Langer, Norbert
A1  - Woosley, S. E.
T1  - Nucleosynthesis in rotating massive stars
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Takahashi, K.
A1  - Faestermann, T.
A1  - Kienle, P.
A1  - Basch, F.
A1  - Langer, Norbert
A1  - Wagenhuber, J.
T1  - The 187 Re - 187Os cosmochronometry and chemical evolution in the solar neighborhood
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Langer, Norbert
A1  - Heger, Alexander
A1  - Braun, H.
T1  - Nucleosynthesis in massive stars
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Langer, Norbert
A1  - Heger, Alexander
T1  - B[e] supergiants : what is their evolutionary status?
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Driebe, Thomas
A1  - Schönberner, Detlef
A1  - Blöcker, Thomas
A1  - Herwig, Falk
T1  - The evolution of helium white dwarfs : I. the companion of the millisecond pular PSR J1012+5307
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Gräfener, Götz
A1  - Hamann, Wolf-Rainer
A1  - Hillier, D. J.
A1  - Koesterke, Lars
T1  - Spectral analyses of WC stars in the LMC
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Hamann, Wolf-Rainer
A1  - Koesterke, Lars
T1  - Spectrum formation in clumped stellar winds : consequences for the analyses of Wolf-Rayet spectra
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Hamann, Wolf-Rainer
A1  - Koesterke, Lars
T1  - The nitrogen spectra of Wolf-Rayet stars
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Heger, Alexander
A1  - Langer, Norbert
T1  - The spin-up of contracting red supergiants
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Herwig, Falk
A1  - Schönberner, Detlef
A1  - Blöcker, Thomas
T1  - On the validity of the core-mass luminosity relation for TP-AGB stars with efficient dredge-up
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Langer, Norbert
T1  - Coupled mass and angular momentum loss of massive main sequence stars
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Leuenhagen, U.
A1  - Hamann, Wolf-Rainer
T1  - Spectral analyses of late-type [WC] central stars of planetary nebulae : more empirical constraints for their evolutionary status
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Pena, M.
A1  - Stastinska, G.
A1  - Esteban, C.
A1  - Koesterke, Lars
A1  - Medina, S.
A1  - Kingsburgh, R.
T1  - Galactic planetary nebulae with Wolf-Rayet nuclei : I. Objects with [WC]-early type stars
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Wittkowski, M.
A1  - Langer, Norbert
A1  - Weigelt, G.
T1  - Diffraction-limited Speckle-Masking interferometry of the red supergiant VY CMa*
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Albrecht, Fred
A1  - Brehmer, Ludwig
A1  - Liemant, Alfred
T1  - Hopping transport in a disordered lattice simulation of dark discharge
N2  - On the basis of a stochastic model of hopping transport in disordered solids we present results of simulations of the dark discharge of surface charged thin films considering the energetic distribution of the localised states within the sheet. A non- linear differential equation with suitable boundary and initial conditions describes the time evolution of the space charge. We suppose a Gaussian distribution of energies for the carrier transporting states with a standard deviation s. The arrival time of carriers at the rear electrode of the sandwich sample is studied in dependence on film thickness, initial surface charge, and energetic disorder. Our calculations confirm that the transit time increases indirect proportional with initial surface charge and proportional with the square thickness. For standard deviations of energetic distribution of 0.05 eV up to 0.25 eV the normalised transit time grows as s1.44. We discuss this in terms of the stochastic transport model.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Peñacorada, Florencio
A1  - Souto, Jorge
A1  - Katholy, Stefan
A1  - Saja, José-Antonio de
A1  - Reiche, Jürgen
T1  - Structure of Langmuir monolayers of substituted phthalocyanines
N2  - Langmuir floating layers of two phthalocyanine derivatives, ytterbium bisphthalocyanine and tetra-tert-butyl nickel phthalocyanine, were investigated by means of compression isotherms, surface potential kinetics and Brewster angle microscopy (BAM) in order to study the influence of peripheral substituents on the structure and stability of these films and on their suitability for a subsequent transfer onto solid substrates. Specific substitutions that may lead to amphiphilic molecular units seem to play a key role in the development of well organised thin films prepared with this technique.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Voss, Henning U.
A1  - Bünner, M. J.
A1  - Abel, Markus
T1  - Identification of continuous, spatiotemporal systems
Y1  - 1998
UR  - http://www.stat.physik.uni-potsdam.de/~markus/papers/PRE57-2820.pdf
ER  - 
TY  - JOUR
A1  - Janietz, Dietmar
A1  - Katholy, Stefan
A1  - Brehmer, Ludwig
T1  - Monolayer properties of Amphiphilic Tetrakis(phenylethynyl)benzene compounds
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Janietz, Dietmar
T1  - Structure formation of functional sheet-shaped mesogens
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Goldmann, Daniela
A1  - Dietel, Reinhard
A1  - Janietz, Dietmar
A1  - Schmidt, C.
A1  - Wendorff, Joachim Heinz
T1  - Sheet-shaped mesogens based on 1,3,5-Triazines : variation of columnar mesophases through intermolecular hydrogen bonding
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Freydank, Anke-Christine
A1  - Janietz, Silvia
A1  - Schulz, Burkhard
T1  - Synthesis and electrochemical behaviour of Amphiphilic 1,3,4-Oxadiazole derivatives
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Lorenz, Dieter
A1  - Menzel, Ralf
T1  - Broadband operation of frequency doubled Cr4+:YAG laser with high beam quality
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Petzschmann, Olaf
A1  - Thiessenhusen, Kai-Uwe
A1  - Spahn, Frank
A1  - Schmidt, Jürgen
T1  - Inelastic collisions in planetary rings : thickness and satellite-induced structures
Y1  - 1998
SN  - 0-7923-5102-9
ER  - 
TY  - JOUR
A1  - Breitenbach, Gerd
A1  - Illuminati, Fabrizio
A1  - Schiller, Stephan
A1  - Mlynek, Jürgen
T1  - Broadband detection of squeezed vacuum : a spectrum of quantum states
N2  - We demonstrate the simultaneous quantum state reconstruction of the spectral modes of the light field emitted by a continuous wave degenerate optical parametric amplifier. The scheme is based on broadband measurement of the quantum fluctuations of the electric field quadratures and subsequent Fourier decomposition into spectral intervals. Applying the standard reconstruction algorithms to each bandwidth-limited quantum trajectory, a "spectrum" of density matrices and Wigner functions is obtained. The recorded states show a smooth transition from the squeezed vacuum to a vacuum state. In the time domain we evaluated the first order correlation function of the squeezed output field, showing good agreement with theory.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Schiek, Michael
A1  - Drepper, Friedhelm R.
A1  - Engbert, Ralf
A1  - Suder, Katrin
A1  - Abel, Hans-Henning
T1  - Cardiorespiratory Synchronization
N2  - The complex behaviour of cardiorespiratory dynamics is shown to be related to the interaction between several physiological oscillators. This study is based on electrocardiogram and respiratory flow data obtained from 3 different subjects during paced breathing at 10 different pacing cycle lengths ranging from 5 s to 12 s. Two different methods ideally suited for the analysis of synchronization pattern of coupled oscillators are applied: 1. Symbolic dynamics based on symbol coding adapted for the detection of respiratory modulation of cardiac parasympathetic activity discloses two regimes of different synchronization behaviour within the frequency area corresponding to the Arnold tongue of 1:1 frequency-locking between respiratory flow and respiratory heartbeat variation (respiratory sinus arrhythmia). 2. The analysis of the phase shift between respiratory flow and respiratory sinus arrhythmia indicates that synchronization is not a static but a dynamic phenomenon. The observed dependence of the phase shift on respiratory cycle length shows large inter-individual variation. These findings turn out to be further hints for the existence of an additional central oscillator in the frequency range of respiration interacting with the central respiratory oscillator driving mechanical respiration.
Y1  - 1998
SN  - 3-540-63481-9
ER  - 
TY  - JOUR
A1  - Kliem, Bernhard
A1  - Schwarz, Udo
A1  - Kurths, Jürgen
A1  - Dennis, Brian
A1  - Schwartz, Richard
A1  - Aschwanden, Markus J.
T1  - Wavelet analysis of solar flare hard X-ray
Y1  - 1998
SN  - 0004-637x
ER  - 
TY  - JOUR
A1  - Zaikin, Alexei A.
A1  - Rosenblum, Michael
A1  - Landa, Polina S.
A1  - Kurths, Jürgen
T1  - On-off itermittency phenomena in a pendulum with a randomly vibrating suspension axis
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Rosenblum, Michael
A1  - Peng, C. K.
A1  - Ivanov, Plamen Ch.
A1  - Mietus, J.
A1  - Havlin, Shlomo
A1  - Stanley, H. Eugene
A1  - Goldberger, Ary L.
T1  - Scaling and universality in heart rate variability distributions
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Engbert, Ralf
A1  - Hainzl, Sebastian
A1  - Zöller, Gert
A1  - Kurths, Jürgen
T1  - Testing for unstable periodic orbits to characterize spatiotemporal dynamics
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Karolyi, György
A1  - Pentek, Aron
A1  - Toroczkai, Zoltán
A1  - Tél, Tómas
A1  - Grebogi, Celso
T1  - Advection of active particles in open chaotic flows
Y1  - 1998
SN  - 0031-9007
ER  - 
TY  - JOUR
A1  - Schwarz, Udo
A1  - Kurths, Jürgen
A1  - Spahn, Frank
A1  - Petzschmann, Olaf
T1  - Reply on the comment of "Clustering of granular assemblies with temperature dependent restitution and under differential rotation"
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Poon, L.
A1  - Grebogi, Celso
A1  - Feudel, Ulrike
A1  - Yorke, J. A.
T1  - Dynamical properties of a simple mechanical system with a large number of coexisting periodic attractors
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kurths, Jürgen
A1  - Kliem, Bernhard
A1  - Schwarz, Udo
A1  - Krüger, Albrecht
A1  - Urpo, S.
T1  - Multiresolution analysis of solar mm-wave bursts
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kim, G. G.
A1  - Kurths, Jürgen
A1  - Kim, S.
A1  - Cao, L. Y.
T1  - Detecting determinism in human posture control data
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Lai, Ying Cheng
A1  - Grebogi, Celso
A1  - Feudel, Ulrike
A1  - Witt, Annette
T1  - Basin bifurcation in quasiperiodically forced systems
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Rosenblum, Michael
A1  - Kurths, Jürgen
A1  - Schäfer, Carsten
A1  - Abel, Hans-Henning
T1  - Heartbeat synchronized with ventilation
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Saparin, Peter
A1  - Huppert, Amit
A1  - Stone, L.
A1  - Price, C.
T1  - El niño chaos : The role of noise and stochastic resonance on the ENSO cycle
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Hnatkova, Katarina
A1  - Vessel, N.
A1  - Voss, Andreas
A1  - Kurths, Jürgen
A1  - Sander, A.
A1  - Schirdewan, Alexander
A1  - Camm, A. J.
A1  - Malik, Marek
T1  - Multiparametric analysis of heart rate variability used for risk stratification among survivors of acute myocardial infarction
Y1  - 1998
SN  - 0895-2795
ER  - 
TY  - JOUR
A1  - Abel, Markus
A1  - Spicci, M.
T1  - Nonlinear localization periodic solutions in a coupled map lattice
N2  - We prove the existence of nonlinear localized time-periodic solutions in a chain of symplectic mappings with nearest neighbour coupling. This is a class of systems whose behaviour can be seen as representation of a lattice of pendula. The effect of discrete time changes the mathematical as well as the numerical procedures. Applying the discrete version of Floquet theory eases and clarifies the procedure of proving the existence of the localized time-periodic solutions. As an extension of the concept of rotobreathers one can produce solutions which rotate at every site of the lattice. To consider these we use a general definition of localization.
Y1  - 1998
UR  - http://www.stat.physik.uni-potsdam.de/~markus/papers/PhD119-22.ps.gz
ER  - 
TY  - JOUR
A1  - Meier, Johann Georg
A1  - Stumpe, Joachim
A1  - Fischer, Birgit
A1  - Thieme, Cathrin
A1  - Fischer, Thomas M.
A1  - Kremer, Friedrich
A1  - Öge, Tanja
A1  - Zentel, Rudolf
T1  - Optical suppression of Ferroelectricity in polysiloxane copolymers with chiral an potochromic side groups
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Makievski, A. V.
A1  - Fainerman, V. B.
A1  - Bree, M.
A1  - Wüstneck, Rainer
A1  - Krägel, Jürgen
A1  - Miller, Reinhard
T1  - Dynamics and thermodynamics of spread and adsorbed food protein layers at the water/air interface
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Wüstneck, Rainer
A1  - Siegel, Stefan
A1  - Ebisch, Th.
A1  - Miller, Reinhard
T1  - Surface behavior of spread sodium eicosanyl sulfate monolayers: 1. p/A isotherms determined on a Langmuir film balance and on drop surfaces and Brewster angle measurements
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Rutloh, M.
A1  - Zebger, I.
A1  - Hoffmann, U.
A1  - Stumpe, Joachim
A1  - Siesler, H. W.
T1  - Photo-Induced orientation effects parallel and perpendicular to the polarization vector of the incident light observed in the same azobenzene containing LC polymer
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Geue, Thomas
A1  - Katholy, Stefan
A1  - Reiche, Jürgen
A1  - Brehmer, Ludwig
A1  - Caliebe, W.
T1  - Grazing incidence x-ray diffraction (GIXD) measurements of uranyl arachidate (UO2A2) LB films
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Otto, Andreas H.
A1  - Steiger, Th.
A1  - Schrader, Sigurd
T1  - HAICI4 in the gas phase is stronger than HTaF6.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Metzger, Robert M.
A1  - Chen, Bo
A1  - Vuillaume, Dominique
A1  - Lakshmikantham, M. V.
A1  - Höpfner, Ulf
A1  - Kawai, Tsuyoshi
A1  - Baldwin, Jeffrey W.
A1  - Wu, Xiangli
A1  - Tachibana, Hiroaki
A1  - Sakurai, Hiromi
A1  - Cava, Michael P.
T1  - Observation of unimolecular electrical rectification in hexadecyquinolinium tricyanoquinodimethamide.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Date, R. W.
A1  - Fawcett, A. H.
A1  - Geue, Thomas
A1  - Haferkorn, J.
A1  - Malcolm, R. K.
A1  - Stumpe, Joachim
T1  - Self-ordering within thin films of poly(olefin sulfone)s.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Menzel, Henning
A1  - Rüther, M.
A1  - Stumpe, Joachim
A1  - Fischer, Thomas M.
T1  - Discrimination of structural order and chromophore aggregation as factors effecting the photo-reorientation of Azobenzene in copolyglutamate LB-films.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Sapich, B.
A1  - Krawinkel, Th.
A1  - Kricheldorf, H. R.
A1  - Stumpe, Joachim
T1  - New polymer syntheses 95. Photosetting cholesteric polyesters derived from 4-hydroxycinnamic acid and isosorbide.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Haferkorn, J.
A1  - Geue, Thomas
A1  - Date, R. W.
A1  - Fawcett, A. H.
A1  - Stumpe, Joachim
T1  - Aggregation and orientation phenomena in constrained films of Poly(olefine sulfone)s.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Kamphausen, C.
A1  - Stumpe, Joachim
T1  - Photoreactions of N-Salycylidenaniles in Glassy PMMA films.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Haferkorn, J.
A1  - Sapich, B.
A1  - Stumpe, Joachim
A1  - Schönhals, A.
T1  - Photochemical modification of the dynamic behavior of Liquid Crystals.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Eckhardt, Th.
A1  - Rutloh, M.
A1  - Stumpe, Joachim
A1  - Krüger, Harald
T1  - Photo-Induced "Command Effects" in LC polymers by the combination of photoorientation and thermotropic self- organization
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Stumpe, Joachim
A1  - Fischer, Thomas M.
A1  - Rutloh, M.
A1  - Meier, Johann Georg
T1  - Photo-Induced orientation effects parallel and perpendicular to the polarization vector of the incident light observed in the same Azobenzene containing LC polymer.
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Wüstneck, Rainer
A1  - Siegel, Stefan
A1  - Ebisch, Th.
A1  - Miller, Reinhard
T1  - Surface behavior of spread sodium eicosanyl sulfate monolayers: 3. Eicosanyl sulfate monolayers spread on a NaCl subphase
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Ziegler, A.
A1  - Fischer, Thomas M.
A1  - Menzel, Henning
A1  - Stumpe, Joachim
T1  - Photo-Induced modification and photo-orientation in LB-multilayers of thermotropic polymers containing azobenzene side groups
Y1  - 1998
ER  - 
TY  - THES
A1  - von Rekowski, Brigitta
T1  - Strömungen und Wirbelsysteme in turbulenten Himmelskörpern mit AKA-Effekt
Y1  - 1998
ER  - 
TY  - THES
A1  - Heuer, Axel
T1  - Phasenkonjugierende Spiegel auf Basis der stimulierten Brillouin-Streuung in optischen Wellenleitern
Y1  - 1998
ER  - 
TY  - THES
A1  - Goldmann, Daniela
T1  - Neuartige flüssigkristalline Systeme mit 1,3,5-Triazinen als heteroaromatischem Molekülkern
Y1  - 1998
ER  - 
TY  - THES
A1  - Lenz, Peter
T1  - Benetzungsphänomene auf strukturierten Substraten
Y1  - 1998
ER  - 
TY  - THES
A1  - Stömmer, Ralph
T1  - X-ray scattering from silicon surfaces and thin oxides on silicon substrates
Y1  - 1998
ER  - 
TY  - THES
A1  - Gau, Hartmut
T1  - Stabilität und Dynamik fluider Mikrostrukturen
Y1  - 1998
CY  - Potsdam
ER  - 
TY  - THES
A1  - Ostermeyer, Martin
T1  - Nd:YAG und Nd:YALO Laseroszillatoren im transversalen Grundmodebetrieb unter Einsatz phasenkonjugierender SBS- Spiegel
Y1  - 1998
ER  -