TY - JOUR A1 - Abel, Markus A1 - Celani, A. A1 - Vergeni, D. A1 - Vulpiani, A. T1 - Front propagation in laminar flows N2 - The Problem of front propagation in flowing media is addressed for laminar velocity fields in two dimensions. Three representative cases are discussed: stationary cellular flow, stationary shear flow, and percolating flow. Production terms of Fisher-Kolmogorov-Petrovskii-Piskunov type and of Arrhenius type are considered under the assumption of no feedback of the concentration on the velocity. Numerical simulations of advection-reaction-diffusion equations have been performed by an algorithm based on discrete-time maps. The results show a generic enhancement of the speed of front propagation by the underlying flow. For small molecular diffusivity, the front speed Vf depends on the typical flow velocity U as a power law with an exponent depending on the topological properties of the flow, and on the ratio of reactive and advective time scales. For open-streamline flows we find always Vf~U, whereas for cellular flows we observe Vf~U1/4 for fast advection and Vf~U3/4 for slow advection. Y1 - 2001 UR - http://www.stat.physik.uni-potsdam.de/~markus/papers/PRE64-46307-1.pdf ER - TY - BOOK A1 - Addison, John T. T1 - Principles of market-oriented labor market policies T3 - Diskussionsbeitrag / Europäisches Institut für internationale Wirtschaftsbeziehungen, Potsdam Y1 - 2001 SN - 1430-5445 VL - 84 PB - Univ. CY - Potsdam ER - TY - BOOK A1 - Adler, Benno Benjamin ED - Voigts, Manfred T1 - Esra : die Geschichte eines orthodox-jüdischen Jugendbundes zur Zeit der Weimarer Republik T3 - Jüdische Kultur N2 - Darstellung der Geschichte eines jugendbewegten und daher antiautoritären Jugendbundes orthodoxer Jugendlicher 1918 - 1932 durch ein ehemaliges Mitglied, gestützt auf schriftliche Quellen und Interviews mit Überlebenden. Y1 - 2001 SN - 3-447-04433-0 VL - 8 PB - Harrassowitz CY - Wiesbaden ER - TY - JOUR A1 - Afshaarvahid, Shahraam A1 - Heuer, Axel A1 - Menzel, Ralf A1 - Munch, Jesper T1 - Temporal structure of stimulated-Brillouin-scattering reflectivity considering transversal-mode development Y1 - 2001 ER - TY - JOUR A1 - Ahlers, Volker A1 - Zillmer, Rüdiger A1 - Pikovskij, Arkadij T1 - Lyapunov exponents in disordered chaotic systems : avoided crossing and level statistics N2 - The behavior of the Lyapunov exponents (LEs) of a disordered system consisting of mutually coupled chaotic maps with different parameters is studied. The LEs are demonstrated to exhibit avoided crossing and level repulsion, qualitatively similar to the behavior of energy levels in quantum chaos. Recent results for the coupling dependence of the LEs of two coupled chaotic systems are used to explain the phenomenon and to derive an approximate expression for the distribution functions of LE spacings. The depletion of the level spacing distribution is shown to be exponentially strong at small values. The results are interpreted in terms of the random matrix theory. Y1 - 2001 ER - TY - JOUR A1 - Albrecht, Tanja A1 - Koch, Anke A1 - Lode, Anja A1 - Greve, Burkhard A1 - Schneider-Mergener, Jens A1 - Steup, Martin T1 - Plastidic (Pho1-type) phosphorylase isoforms in potato (Solanum tuberosum L.) plants : expression analysis and immunochemical characterization Y1 - 2001 ER - TY - JOUR A1 - Altenberger, Uwe A1 - Oberhänsli, Roland A1 - Stein, Eckehard A1 - Moghni, Mohsen T1 - Geochemistry, tectonic setting and geodynamic position of late orogenic dikes in the Melibocus Massiv, Bergstraesser Odenwald Y1 - 2001 ER - TY - JOUR A1 - Altmann, Thomas A1 - Fiehn, Oliver A1 - Kloska, Sebastian T1 - Integrated studies on plant biology using multiparallel techniques Y1 - 2001 ER - TY - JOUR A1 - Altmann, Thomas A1 - Koßmann, Jens T1 - Photosynthesis and primary metabolism Y1 - 2001 SN - 1360-1385 ER - TY - JOUR A1 - Altmann, Thomas A1 - Müssig, Carsten T1 - Brassinosteroid signaling in plants Y1 - 2001 ER -