âbšâr (#), peyšâr
From Fr., from It. cascata "waterfall," from cascare "to fall," from V.L. *casicare, from L. casum, p.p. of cadere "to fall," → case.
Âbšâr, from âb "water," → Aquarius, + šâr "pouring of water and liquids, waterfall;" peyšâr "waterfall succession," from pey "step, succession," as in peyâpey, + šâr. This word maybe related to Skt. sar- "to flow, run, hurry," Gk. iallo "I send out," L. salio "I jump." It may also be variant of Mod.Pers. cal-, calidan "to walk, be going," car-, caridan "to pasture, graze," Av. car- "to come and go," Skt. cari- "to move, walk, wander."
irang-e peyšâri, ~ âbšâri
Fr.: erreur en cascade
An error that amplifies as the process of calculation goes on.
ragbâr-e peyšâri, ~ âbšâri
Multiple generations of secondary cosmic rays when the primary particles produce a succession of secondaries which have the same effects as the primary.
Fr.: transition en cascade
A photon generation mechanism in an atom in which a transition initiates a series of secondary transitions from lower electronic levels.
Fr.: cascade d'énergie
The → turbulent process whereby → kinetic energy is transformed into heat by the action of nonlinear coupling which transfers the energy from large eddies (→ eddy) to smaller and smaller eddies, finally arriving at → dissipative scales dominated by → viscosity (direct cascade). In the simplest case (3D homogeneous hydrodynamic turbulence), the resulting energy distribution is the → Kolmogorov spectrum. The reverse process also exists (inverse cascade) whereby energy is transferred to larger and larger eddies.
Fr.: cascade de Richarson
Same as → energy cascade
Named after L. F. Richardson (1922), Weather Prediction by Numerical Process (Cambridge Univ. Press); → cascade.