Fr.: efficacité d'ouverture
The ratio of the → effective aperture of a radio telescope to the true aperture.
Fr.: efficacité de lobe
A parameter indicating the quality of an antenna as a direction measuring device. It is given by the ratio of the total received power contained in the main beam of an antenna to the total power (including the sidelobes); the same as main beam efficiency. See also → beamwidth.
charge-transfer efficiency (CTE)
kârâyi-ye tarâvaž-e bâr
Fr.: efficacité de transfert de charge
Fraction of the original charge which is successfully transferred from one pixel to the next in one CCD cycle.
detective quantum efficiency (DQE)
kârâyi-ye kuântomi-ye âškâreš
Fr.: rendement quantique de détection
The square of the ratio of the output → signal-to-noise (S/N) to the input S/N.
1) The state or quality of being efficient; competence. Compare
L efficientia, from efficient-, → effect, + -ia "-y," an E. suffix of adjectives.
Kârâyi, from kârâ "efficient," from kâr, → work + â present stem of âmadan "to come," from Av. ay- "to go, to come," aēiti "goes," O.Pers. aitiy "goes," Skt. e- "to come near," eti "arrival," Gk. eimi "I go," L. eo "I go," Tokharian AB i-; PIE *ei- "to go, to walk."
kârâyi-ye turi (#)
Fr.: efficacité de réseau
The measure of the light intensity diffracted from a grating.
Fr.: efficacité quantique
In a detector, the ratio of the number of photoelectrons released to the number of incident photons at a specific wavelength.
star formation efficiency
kârâyi-ye diseš-e setâré
Fr.: efficacité de formation d'étoiles
The degree to which stars form in a system, such as a molecular cloud or a galaxy. It is given by the ratio of the total mass of stars to the initial gas mass.