TY  - JOUR
A1  - Hochheimer, H. D.
A1  - Menon, V.
A1  - Parthasarathy, R.
A1  - Martin, C. R.
A1  - Bechthold, Jeff
A1  - Hor, P.-H.
A1  - Lorenz, Bernd
A1  - Spatz, J. P.
T1  - High pressure conductivity of template synthesized polypyrrole
Y1  - 1994
ER  - 
TY  - GEN
A1  - Henkel, Carsten
A1  - Steane, Andrew M.
A1  - Kaiser, Robin
A1  - Dalibard, Jean
T1  - A modulated mirror for atomic interferometry
N2  - A novel atomic beam splitter, using reflection of atoms off an evanescent light wave, is investigated theoretically. The intensity or frequency of the light is modulated in order to create sidebands on the reflected de Broglie wave. The weights and phases of the various sidevands are calculated using three different approaches: the Born approximation, a semiclassical path integral approach, and a numerical solution of the time-dependent Schrdinger equation. We show how this modulated mirror could be used to build practical atomic interferometers.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 102 
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-42279
ER  - 
TY  - GEN
A1  - Henkel, Carsten
A1  - Courtois, Jean-Yves
A1  - Kaiser, Robin
A1  - Westbrook, C.
A1  - Aspect, Alain
T1  - Phase shifts of atomic de Broglie waves at an evanescent wave mirror
N2  - A detailed theoretical investigation of the reflection of an atomic de Broglie wave at an evanescent wave mirror is presented. The classical and the semiclassical descriptions of the reflection process are reviewed, and a full wave-mechanical approach based on the analytical soution of the corresponding Schrödinger equation is presented. The phase shift at reflection is calculated exactly and interpreted in terms of instantaneous reflection of the atom at an effective mirror. Besides the semiclassical regime of reflection describable by the WKB method, a pure quantum regime of reflection is identified in the limit where the incident de Broglie wavelength is large compared to the evanescent wave decay length.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 103 
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-42289
ER  - 
TY  - GEN
A1  - Henkel, Carsten
A1  - Courtois, Jean-Yves
A1  - Aspect, Alain
T1  - Atomic diffraction by a thin phase grating
N2  - We present a semiclassical perturbation method for the description of atomic diffraction by a weakly modulated potential. It proceeds in a way similar to the treatment of light diffraction by a thin phase grating, and consists in calculating the atomic wavefunction by means of action integrals along the classical trajectories of the atoms in the absence of the modulated part of the potential. The capabilities and the validity condition of the method are illustrated on the well-known case of atomic diffraction by a Gaussian standing wave. We prove that in this situation the perturbation method is equivalent to the Raman-Nath approximation, and we point out that the usually-considered Raman-Nath validity condition can lead to inaccuracies in the evaluation of the phases of the diffraction amplitudes. The method is also applied to the case of an evanescent wave reflection grating, and an analytical expression for the diffraction pattern at any incidence angle is obtained for the first time. Finally, the application of the method to other situations is briefly discussed.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 101 
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-42269
ER  - 
TY  - JOUR
A1  - Grasnick, G.
A1  - Herkner, G.
A1  - Katholy, Stefan
A1  - Brehmer, Ludwig
T1  - Pyroelektrisches Dünnschichtelement
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Fruhner, Horst
A1  - Wantke, K.-D.
A1  - Krägel, Jürgen
A1  - Kretzschmar, Günter
T1  - Untersuchungen zur Stabilität der Flüssigkeitsbrücke beim Wulstbeschichtungsverfahren : IV. Einfluß viskoelastischer Fließeigenschaften auf die Stabilität der Flüssigkeitsbrücke
Y1  - 1994
ER  - 
TY  - THES
A1  - Frank, Bernd
T1  - Thermisch stimulierte Depolarisationsstrom-Untersuchungen zum Einfluß von Wasser auf das dielektrische Spektrum von Polyamid 6
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Fiedler, H.
A1  - Wüstneck, Rainer
A1  - Weiland, B.
A1  - Miller, Reinhard
A1  - Haage, K.
T1  - Surface chemical characterization of maleic acid mono[(4-alkyl piperazine-2-yl)- ethylesters] :1. The complex adsorption behavior of an ampholytic surfactant
Y1  - 1994
ER  - 
TY  - INPR
A1  - Feudel, Fred
A1  - Seehafer, Norbert
T1  - On the bifurcation phenomena in truncations of the 2D Navier-Stokes equations
N2  - We have studied bifurcation phenomena for the incompressable Navier-Stokes equations in two space dimensions with periodic boundary conditions. Fourier representations of velocity and pressure have been used to transform the original partial differential equations into systems of ordinary differential equations (ODE), to which then numerical methods for the qualitative analysis of systems of ODE have been applied, supplemented by the simulative calculation of solutions for selected initial conditions. Invariant sets, notably steady states, have been traced for varying Reynolds number or strength of the imposed forcing, respectively. A complete bifurcation sequence leading to chaos is described in detail, including the calculation of the Lyapunov exponents that characterize the resulting chaotic branch in the bifurcation diagram.
T3  - NLD Preprints - 1 
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-13390
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Haase, Alfred
A1  - Menzel, Ralf
A1  - Schwartz, J.
T1  - Depolarization treatment and optimization of high power double pass neodym-rod amplifiers with SBS mirror
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Haase, Alfred
A1  - Menzel, Ralf
T1  - SBS-Phase Conjugation for Thermal Lens Compensation in 100 Watt Average Power Solid-State Lasers
Y1  - 1994
ER  - 
TY  - BOOK
A1  - Duit, Reinders
A1  - Mikelskis, Helmut
T1  - Physik, um die Welt zu begreifen : ein Lehrbuch für die Jahrgangsstufe 7/8 ; [Hauptbd.], Niedersachsen
Y1  - 1994
SN  - 3-425-03676-9
PB  - Diesterweg; Konkordia-Verl.
CY  - Frankfurt am Main; Bühl
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Schulz, Burkhard
A1  - Mercer, Frank W.
T1  - Synthesis and characterization of fluorinated poly(imide-pyridazine- amide)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Mercer, Frank W.
A1  - Schulz, Burkhard
A1  - Dietel, Reinhard
A1  - Neumann, Werner
T1  - Fluorinated poly(benzoxazole-imide)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Mercer, Frank W.
A1  - Schulz, Burkhard
A1  - Dietel, Reinhard
A1  - Fitch, J.
A1  - Cassidy, Peter
T1  - Study of crosslinking process in fluorinated poly(imide-amide)s containing pendant cyano groups
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Mercer, Frank W.
A1  - Schulz, Burkhard
A1  - Dietel, Reinhard
A1  - Fitch, J.
A1  - Cassidy, Peter
T1  - Study of crosslinking process in fluorinated poly(imide-amide)s containing pendant cyano groups
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
A1  - Hahn, M.
A1  - Seifert, M.
A1  - Wernecke, R.
A1  - Jäger, Werner
A1  - Wonnenberg, R.
A1  - Zehner, C.
T1  - Verfahren zur Herstellung eines Feuchtsensor
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
A1  - Hahn, M.
A1  - Seifert, M.
A1  - Wernecke, R.
A1  - Jäger, Werner
A1  - Wonnenberg, R.
A1  - Zehner, C.
T1  - Feuchtesensor
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
T1  - Dünne organische Schichten : Anforderungen und Möglichkeiten für die Sensorik
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Baier, Frank W.
A1  - Wipper, H.
T1  - Luminosity distribution in cD clusters
Y1  - 1994
ER  -