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(a) Left. A cylindrical current channel with main radius , a constriction of radius and axial length , and total axial length . The Holm–Timsit model of -spot is recovered in the limit . (b) Right. The experimental setup, which is exactly one half of the theoretical model shown to the left.
The experimentally measured contact resistance and the theoretically predicted values. Five constriction heights were used for each constriction radius .
Dimensions, measured resistance, and expected resistance of the copper sulfate channels. All channels had diameter , and length .
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