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  - 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  - 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  - 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  - Cheng, Z. Y.
A1  - Katiyar, R. S.
A1  - Bauer, Siegfried
A1  - Bauer-Gogonea, Simona
A1  - Gerhard, Reimund
T1  - Thermally stimulated depolarization current of a nonlinear optical side-chain polymer
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Bauer-Gogonea, Simona
A1  - Cheng, Z. Y.
A1  - Wirges, Werner
A1  - Bauer, Siegfried
A1  - Gerhard, Reimund
A1  - Das-Gupta, D. K.
T1  - Dielectric investigation of thermally-induced chromophore degradation in nonlinear optical polymer electrets
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  - 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  - 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  - 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  - Rosenblum, Michael
A1  - Kurths, Jürgen
A1  - Schäfer, Carsten
A1  - Abel, Hans-Henning
T1  - Heartbeat synchronized with ventilation
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  - 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  - 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  - 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  - 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  - 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  - 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  - 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  - 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  - Javanainen, Juha
A1  - Wilkens, Martin
T1  - Phase and phase diffusion of a split Bose-Einstein condensate
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  - Langer, Norbert
A1  - Heger, Alexander
T1  - B[e] supergiants : what is their evolutionary status?
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  - 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  - Heger, Alexander
A1  - Langer, Norbert
A1  - Woosley, S. E.
T1  - Nucleosynthesis in rotating massive stars
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  - 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  - Koesterke, Lars
A1  - Werner, Klaus
T1  - Determination of mass-loss rates of PG 1159 stars from FUV spectroskopy
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  - 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  - 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  - 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  - Langer, Norbert
T1  - Coupled mass and angular momentum loss of massive main sequence stars
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  - 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  - Heger, Alexander
A1  - Langer, Norbert
T1  - The spin-up of contracting red supergiants
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  - 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  - 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  - 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  - THES
A1  - Wambsganß, Joachim
T1  - Gravitational lensing as a universal astrophysical tool
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Darowski, Nora
A1  - Pietsch, Ullrich
A1  - Wang, K. H.
A1  - Forchel, Alfred
A1  - Shen, W.
A1  - Kycia, S.
T1  - X-ray diffraction analysis of strain relaxation in free standing and buried GaAs/GaInAs/GaAs SQW lateral structures
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Haier, P.
A1  - Herrmann, B. A.
A1  - Esser, N.
A1  - Pietsch, Ullrich
A1  - Lüders, K.
A1  - Richter, W.
T1  - Influence of the deposition rate on the structure of thin metal layers
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Stahn, Jochen
A1  - Pucher, Andreas
A1  - Geue, Thomas
A1  - Daniel, A.
A1  - Pietsch, Ullrich
T1  - Electric field induced electron density response of GaAs and ZnSe
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Darowski, Nora
A1  - Lübbert, Daniel
A1  - Pietsch, Ullrich
A1  - Zhuang, Y.
A1  - Zerlauth, S.
A1  - Bauer, Günther
T1  - In-plane strain and strain relaxation in laterally patterned Si/SiGe quantum dots and wire arrays
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Stömmer, Ralph
A1  - Göbel, H.
A1  - Hub, W.
A1  - Pietsch, Ullrich
T1  - X-ray scattering from silicon surfaces
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Stömmer, Ralph
A1  - Martin, C. R.
A1  - Geue, Thomas
A1  - Göbel, H.
A1  - Hub, W.
A1  - Pietsch, Ullrich
T1  - Comparative studies of fractal parameters of Si(100) surfaces measured by X-ray scattering and atomic force microscopy
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Darowski, Nora
A1  - Pietsch, Ullrich
A1  - Zeimer, Ute
A1  - Smirnitzki, V.
A1  - Bugge, F.
T1  - Nondestructive analysis of a lateral GaAs nanostructure buried under AlGaAs using conventional high resolution and grazing incidence X-ray diffraction
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Baumbach, Tilo
A1  - Lübbert, Daniel
A1  - Pietsch, Uwe
A1  - Darowski, Nora
A1  - Leprince, L.
A1  - Talneau, A.
A1  - Schneck, J.
T1  - Grazing incidence diffraction by epitaxial multilayered gratings
Y1  - 1998
ER  -