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. Author manuscript; available in PMC: 2018 Jan 19.
Published in final edited form as: Chem Phys. 2009 Nov 11;370(1-3):238–243. doi: 10.1016/j.chemphys.2010.04.012

Fig. 1.

Fig. 1

Schematic representation of a tube of alternating diameter (panel (a)) and corresponding dimensionless entropy potential (panel (b)). The tube consists of alternating wide and narrow sections of radii R and a whose lengths are equal to lw and ln, respectively. The dimensionless entropy potential, βU(x) = 2 ln (R/r(x)), is equal to zero and 2 ln (R/a) in the wide and narrow sections of the tube, respectively. At the boundaries separating the two sections the potential make a jump, βΔU = 2 ln (R/a).