Fig. 6
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Differences of friction forces: (a) difference of hydrodynamic friction of new ring; (b) difference of asperity friction of new ring; (c) difference of hydrodynamic friction of run-in ring; (d) difference of asperity friction of run-in ring; (e) difference of hydrodynamic friction of embedded ring; (f) difference of asperity friction of embedded ring.
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