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. 2014 Jul 31;5:4463. doi: 10.1038/ncomms5463

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(a), Given some statistical distribution W(x, t) of particles, these particles can be driven across the position x_b, either ballistically by external forces (j_drift) or diffusively through random thermal noise (j_diff.). (b) Inserting an absorber at x_b effectively eliminates diffusive backscattering, thus doubling the diffusive contribution to the resultant probability flux j* into x_b.