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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) Diffusion from fiber surface dAfib, which corresponds to the fiber volume dVfib and total volume dV; dVsur is the volume occupied by the surrounding medium; (b) Corresponding smeared model.