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. 2017 Mar 3;7:54. doi: 10.1038/s41598-017-00082-2

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Experimental set up. 1- Bracket; 2- Cylindrical tube; 3- Bulkhead; 4- Chicken wire; 5- Bucket; 6- Scale; 7- High speed camera; 8 - Sand; 9 - Glass beads.