We present an experimental study of the space and time evolution of the Eckhaus instability, a general mechanism of pattern selection for spatially periodic patterns in nonlinear systems. Using a convecting liquid crystal layer, we observed long-wavelength modulations leading to the nucleation of new roll pairs. The development of this process is studied by time-resolved spatial Fourier analysis and compared with predictions based on an amplitude equation.
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Lowe et al. (1985) studied this question.
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