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transition probability šavânâyi-ye gozareši Fr.: probabilité de transition The probability that a quantum-mechanical system will make a transition from a given initial state to a given final state. → transition; → probability. |
transitional flow tacan-e gozareši Fr.: flux de transition In fluid mechanics, a flow composed of → laminar and → turbulent flows, for which the → Reynolds number is between 2300 and 4000. → transition; → flow. |
transposition tarâneheš Fr.: transposition Math.: A permutation of a set of elements that interchanges two elements and
leaves the remaining elements in their original positions.
For example, the swapping of 2 and 5 to take the list 123456 to 153426 is a transposition. |
true position neheš-e râstin Fr.: position vraie The coordinates of an object for a given date, with respect to the true equator and the true equinoxes for the instant of time in question. |
university dânešgâh (#) Fr.: université An institution of higher education composed of several faculties for teaching and research and authorized to grant academic degrees. M.E., from O.Fr. universitei, from M.L. universitatem (nominative. universitas), in L.L. "corporation, society," from L., "the whole, aggregate," from universus "whole, entire," → universe. Dânešgâh, from dâneš, → science, + -gâh "place; time" (Mid.Pers. gâh, gâs "time;" O.Pers. gāθu-; Av. gātav-, gātu- "place, throne, spot;" cf. Skt. gâtu- "going, motion; free space for moving; place of abode;" PIE *gwem- "to go, come"). |
upper transit gozar-e zabarin (#) Fr.: passage supérieur The movement of a celestial body across a celestial meridian's upper branch. Same as → upper culmination. |
vector density cagâli-ye bordâr Fr.: densité de vecteur A → tensor density of → order 1. |
vibrational transition gozareš-e šiveši Fr.: transition vibrationnelle A transition between two → quantized → levels of a → molecule that have different vibrational energies. → vibrational; → transition. |
vibrational-rotational transition gozareš-e carxeši-šiveši Fr.: transition vibrationnelle-rotationnelle A slight change in the → energy level of a → molecule due to → vibrational transition and/or → rotational transition. → vibrational; → rotational; → transition. |
viscosity vošksâni (#) Fr.: viscosité The property of a → fluid that resists the force tending to cause the fluid to flow. Viscosity may be thought of as the internal → friction of two fluid layers which flow parallel to each other at different speeds. The cause of viscosity is the transport of → momentum by the molecules from one layer to the other. Viscosity is given by η = φ.u.λ.ρ, where φ is a coefficient which depends on the nature of the interaction between the molecules, u is the average velocity of thermal motion of the molecules, λ is the → mean free path, and ρ the → density of the fluid. Also called → dynamic viscosity or → absolute viscosity. See also → kinematic viscosity. |
weight of a tensor density vazn-e cagâli-ye tânsor Fr.: poids d'une densité de tenseur A constant the value of which is characteristic for any given → tensor density. |
wind luminosity tâbandegi-ye bâd Fr.: luminosité de vent The final kinetic energy of the → stellar wind expressed by: (1/2)Mdot.v_{∞}^{2} = (1/2)(v_{∞}/c)L For an O6 star, L ~ 3 x 10^{5}Lsun and v_{∞} ~ 2000 km s^{-1}, which give a wind luminosity of ~ 1 x 10^{37} erg s^{-1}, about 1% of the → stellar luminosity. See also → photon tiring limit. → wind; → luminosity. |
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