quasi- cunân-, -vaš Fr.: quasi- A prefix meaning "resembling, almost, having some, but not all of the features of." From L. quasi "as if, as though," from qua(m)" as" + si "if." Cunân "so, like that; just as if," from cun "how?," (Mid.Pers. cigôn "how?," cigônêh "nature, character," O.Pers/Av. ci- "what, any," collateral stem to ka- "who?, what?;" cf. Skt. ka-; Gk. po-; L. quo-; E. what, who; PIE *qwos/*qwes) + suffix ân. -vaš a suffix of similitude. |
quasi-atom cunân-atom, atom-vaš Fr.: quasi-atome A system in which the nuclei of two colliding atoms approach each other closely for a brief lapse of time so that their electrons are arranged in atomic orbitals characteristic of a single atom with combined atomic number. |
quasi-closed subsystem zir-râžmân-e cunân-basté Fr.: sous-système quasi-fermé A subsystem if its intrinsic energy is large, on the average, with respect to the energy of its interaction with other portions of the → closed system. |
quasi-linear theory negare-ye cunân-xatti Fr.: théorie quasi-linéaire In plasma physics, the theory that considers the interactions between waves and particles are of first order only. It ignores all terms of second order in the fluctuating quantities. |
quasi-satellite cunân-mâhvâré, cunân-bandevâr Fr.: quasi-satellite An asteroid moving around the Sun having the same mean motion and mean → longitude as a planet, but a different → eccentricity. The asteroid remains near the planet much like a satellite even when its distance is large enough so that it is well outside the planet's → Hill sphere. The quasi-satellite motion is one class of possible → co-orbital motions of small bodies in 1:1 mean-motion → resonance with a planet. If the quasi-satellite orbit is coplanar with the planet, then the motion is stable in the → secular approximation. When the orbits are inclined enough, an asteroid can be trapped into such a motion for a finite period of time. Earth has several quasi-satellites (mainly 3753 Cruithne, 2002 AA_{29}, 2003 YN_{107}), also does Venus (the only one so far discovered, 2002 VE_{68}). The possibility of such orbits was first suggested by J. Jackson (1913, MNRAS 74, 62). The term quasi-satellite was first used by S. Mikkola & K. Innanen 1997, The Dynamical Behaviour of our Planetary System; Proceedings, p. 345); → quasi-; → satellite. |
quasi-separatrix layer (QSL) lâye-ye cunân-jodâgar Fr.: couche quasi-séparatrice A region of the solar atmosphere where the gradient of the field line → linkage from one boundary to another is large so that the field lines can slip-run rapidly through the → plasma. The QSL results from → magnetic reconnection without → null point. → quasi-; → separatrix; → layer. |
quasi-single-scattering approximation nazdineš-e cunân-tak-parâkaneš Fr.: A model of radiative transfer that ignores forward scattering of photons; assuming forward-scattered light as un-scattered. → quasi-; → single; → scattering; → approximation. |
quasi-stellar object barâxt-e cunân-setâre-yi Fr.: objet quasi-stellaire Initial name of → quasars. |
quasi-stellar radio source râdio-xan-e cunân setâré, ~ ~ setâré-vaš Fr.: radiosource quasi-stellaire A quasar with detectable radio emission. |