The effect of higher harmonics of periodic perturbat ion for phase entrainment was studied by numerical simulation of the Oregonator model system. When the 2nd higher harmonics was added to the single sinusoidal perturbation, the change of the phase stable point was observed. Owing to the 2nd higher harmonics added, various synchronization could be seen in different from the case of single sinusoidal perturbation: bistability of entrained phase, modulation of synchronization to sub-harmonic or chaotic form.
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