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Clones and hyperidentities
(1996)
Camus und sein erster Lehrer
(1996)
Das deutsche Schriftsystem
(1996)
Wörter
(1996)
Wörter : Basisartikel
(1996)
Diderot et Raynal : l'oeil, l'oreille et le lieu de l'écriture dans l'"Histoire des deux Indes"
(1996)
Amplifying bienzyme cycle-linked immunoassays for determination of 2,4- dichlorphenoxyacetic acid
(1996)
Ultrasensitive biosensors
(1996)
Theorie der differentiellen Rotation der Sonne und ihrer magnetfeldbedingten Torsionsschwingungen
(1996)
Erich Honecker
(1996)
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.
estates (Stände)
(1996)
Adel und Staatsverwaltung in Brandenburg im 19. und 20. Jahrhundert : ein historischer Vergleich
(1996)
Kognitive Komplexität
(1996)
Lagebewußtsein als Faktor von Lernbeeinträchtigung und Bedingung der Förderung von Lernfähigkeit
(1996)
Konferenzeröffnung
(1996)
Biologie : Lehrbuch für Sekundarstufe II ; Gymnasium, Gesamtschule ; Lehrerband mit Kopiervorlagen
(1996)
Using a special technique of data analysis, we have found out 34 grand minima of solar activity in a 7,700 years long C14 record. The method used rests on a proper filtering of the C14 record and the extrapolation of verifiable results for the later history back in time. Additionally, we have applied a method of nonlinear dynamics, the recurrence rate, to back up the results. Our findings are not contradictory to the record of grand minima by Eddy, but constitute a considerable extension. Hence, it has become possible to look closer at the validity of models. This way, we have tested esp. the model of Barnes et al. There are hints for that the grand minima might solely be driven by the 209--year period found in the C14 record.