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.
A 1D diffusion model with discrete steps in space (∆x) and time (∆t). The numbers signify how many pathways to that particular destination exist. Total number of all pathways is calculated on the right margin. See text for a detailed explanation.
