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Figure 4
One-dimensional composite slab with axial position x. The interval l0 < x < lm consists of m layers. The interfaces between adjacent layers are located at x = li (i = 1, …, m − 1), the width of layer i is denoted as di = li − li−1 and the diffusivity in layer i is denoted as Di. External boundary conditions apply at the ends of the slab (at x = l0 and x = lm) with internal boundary conditions defined at the interfaces (Carr & Turner, 2016BB7).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 4| August 2023| Pages 1057-1065
https://doi.org/10.1107/S1600576723004958
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