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The relationships of cigarette butt densities in unprotected and protected areas with latitude, longitude, and sampling year were assessed using Spearmans non-parametric correlation, after verifying normality and homogeneity with the ShapiroWilk and Levene tests, respectively
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In terms of the SEM images of the cellular microstructures, a finite element based RVE model was created, consisting of the stiff phase, cellular walls and the soft phase, protoplast