: It doubles the effective scanning speed (measured in images per minute, or IPM) without increasing the physical speed of the paper movement. Brands like Ricoh frequently use this term for their top-tier high-capacity feeders. Duplexing Automatic Document Feeder (DADF) :
When looking for the best performance, look for products with "Single-Pass" capabilities, often found in high-end office series like the Xerox VersaLink Canon imageRUNNER Efficiency:
If "DADF" in your context refers to (sometimes seen in hydrology or atmospheric physics) rather than particle dynamics, the comparison differs: SPDF would refer to discrete particle counts, while DADF would refer to continuous density probability fields. In that scenario, DADF is "best" for macro-scale environmental modeling, while SPDF is "best" for discrete transport phenomena.