Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The probability density of the transit time between neighboring openings in the absence of the driving force at the three values of the opening radius: circles, squares, and triangles correspond to the opening radii equal to 0.1R, 0.3R, and 0.5R, respectively. The arrows indicate corresponding values of D0⟨τ(0)⟩∕R2.
