Figure 1.

(A) The mean-square displacement 〈Δx²(t)〉 of a particle in the presence of periodically spaced permeable membranes in the direction normal to the membranes. (Inset) System geometry. The parameters in dimensionless units: membrane permeability is 0.01; intermembrane distance is 10; and particle diffusion coefficient in free space is 1. (Dotted and dashed straight lines) Short- and long-time asymptotic behaviors of 〈Δx²(t)〉, respectively. (B) The three exponents α_fit(t), α_int(t), and α_dif(t) obtained by interpreting the transient behavior of 〈Δx²(t)〉 as anomalous subdiffusion. (Inset) The exponents as functions of log t. To see this figure in color, go online.