focal reducer kâhande-ye kânuni, bâzhâzande-ye ~ Fr.: réducteur focal An optical component or system for changing the image scale of a telescope to achieve a better match between the → seeing disk and the → pixel size. |
reduce 1) bâzhâxtan, bâzhâzidan; 2) kâstan Fr.: réduire 1) To bring to a certain state, condition, arrangement, etc. M.E. reducen "to lead back," from O.Fr. reducer, from L. reducere, from → re- "back" + ducere "to bring, to lead." From bâz-, → re- +
Mid.Pers. hâxtan, hâzidan
"to lead, guide, persuade," Av. hak-, hacaiti "to attach oneself to, to join," cf.
Skt. sacate "accompanies, follows," Gk. hepesthai
"to follow," L. sequi "to follow;" PIE *sekw- "to follow." |
reduced mass jerm-e bâhâzidé Fr.: masse réduite The "effective" → inertial mass appearing in the → two-body problem of → Newtonian mechanics. The reduced mass is a quantity which allows the two-body problem to be solved as if it were a one-body problem. For the masses m_{1} and m_{2}, it is given by the ratio μ = m_{1}m_{2} / (m_{1} + m_{2}). The value of μ is generally smaller than m_{1} and m_{2}. The larger the difference between the two masses, the closer μ will be to the smaller mass. If the particles are of equal mass, μ is half the mass of either. |
reduced Planck constant pâyâ-ye Planck-e bâzhâzidé Fr.: constante de Planck réduite The → Planck constant divided by 2π and denoted ħ, pronounced h-bar. Also called the → Dirac constant. Reduced, p.p. of → reduce; → Planck's constant. |
reduced Planck's constant pâyâ-ye Planck-e bâzhâzidé Fr.: constante de Planck réduite |