Universal 1/f Noise from Dissipative SOC Models
  We introduce a model able to reproduce the main features of 1/f noise: hyper-universality (the power-law exponents are independent on the dimension of the system; we show here results in d=1,2) and apparent lack of a low-frequency cutoff in the power spectrum. Essential ingredients of this model are an activation-deactivation process and dissipation. 
P. De Los Rios and Y.-C. Zhang (Universite de Fribourg, Switzerland)