We demonstrate by electronic circuit experiments the feasibility of an unstable control loop to stabilize torsion-free orbits by time-delayed feedback control. Corresponding analytical normal form calculations and numerical simulations reveal a severe dependence of the basin of attraction on the particular coupling scheme of the control force. Such theoretical predictions are confirmed by the experiments and emphasize the importance of the coupling scheme for the global control performance.
We predict theoretically and verify experimentally the suppression of chaos in the Lorenz system driven by a high-frequency periodic or stochastic parametric force. We derive the theoretical criteria for chaos suppression and verify that they are in a good agreement with the results of numerical simulations and the experimental data obtained for an analog electronic circuit.
Bei der Umsetzung von KCN mit überschüssigem, siedendem SO3 entstehen außer Kaliumpolysulfat, Schwefeldioxyd und Paracyan Disulfuryldiisocyanat, S2O5(NCO)2 (F. 27,0°) und N,N′‐bis‐schwefeltrioxyd‐dicyan, (CN)2 · 2 SO3. Die Konstitution der letzteren Verbindung folgt aus ihrer Hydrolyse zu Sulfat, Oxamid bzw. Oxalsäure neben geringen Mengen an CO 3−−, NH 4+ und CN−, sowie aus der Synthese aus Dicyan und SO3. Die Verbindung besitzt Salzcharakter, ist stark hygroskopisch und zersetzt sich, ohne zu schmelzen, oberhalb 180°.
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