In this Letter we introduce a new kind of coherent particle production
mechanism called dual coherent particle emission (DCPE) as generalized
two-component Cherenkov-like effect, which takes place when the phase velocity
of emitted particle v_{Mph} and the particle source phase velocity v_{B_1ph}
satisfy a specific DCPE condition: v_{Mph} <= v_{B_1ph}^{-1}. The general
signatures of the DCPE in dielectric, nuclear and hadronic media are
established and some experimental evidences are presented.Comment: 12 pages, 4 fig