By using the reductive perturbation method, a nonlinear Zakharov-Kuznetsov equation governing the dust acoustic (DA) solitary waves is derived for magnetized dusty plasmas which contains N different dust grains with a size distribution and charge fluctuation, nonthermally distributed ions and Boltzmann distributed electrons. We analyse the effects of dust charge fluctuation, the temperatures of dust grains and ions, and dust size distribution on the natures of the DA solitary waves. PACS number: 5235S

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One indication of the stability of a living system is the variation of the system’s characteristic time scales. Underlying the stability mechanism are the structural hierarchy and self-organization of systems, factors that give rise to a positive (accelerating) feedback and a negative (braking) feedback. Information processing in the brain cortex plays a special role in highly organized living organisms.

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