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opaque keder (#) Fr.: opaque General:
Not permitting a radiation to pass through. Adj. form of → opacity. |
open bâz (#) Fr.: ouvert Not closed. O.E. open "not closed down, raised up," also "uncovered, bare; plain, evident," related to up; from P.Gmc. *upana (cf. O.N. opinn, Swed. öppen, Dan. aaben, O.Fris. epen, O.H.G. offan "open"), from PIE *upo "up from under, over;" cf. L. sub; Gk. hypo; O.Pers. upā (prep.) "under, with;" Av. upā, upa (prep.; prevb) "toward, with, on, in;" Mod.Pers. bâ "with," from abâ; Skt. úpa (adv., prevb., prep.) "toward, with, under, on." Bâz "open," from Mid.Pers. abâz-, apâc-, O.Pers. apa- [pref.] "away, from;" Av. apa- [pref.] "away, from," apaš [adv.] "toward the back;" cf. Skt. ápāñc "situated behind." |
open cluster xuše-ye bâz (#) Fr.: amas ouvert A loose grouping of dozens or hundreds of young stars distributed in a region a few light-years across. Open clusters are relatively young, typically containing many hot, highly luminous stars. They are located within the disk of the Galaxy, whence their older name Galactic clusters. |
open interval andarvâr-e bâz Fr.: intervalle ouvert An interval that does not include its two endpoints. |
open magnetic field line xatt-e bâz-e meydân-e meqnâtisi-ye Fr.: ligne ouverte de champ magnétique In the context of solar physics, a → magnetic field line when it crosses the solar surface only once, i.e., when it goes from surface to infinity. This is the case at a sufficiently large scale in → coronal holes. This is mostly not the case in → active regions. |
open set hangard-e bâz Fr.: ensemble ouvert A set consisting of points having neighborhoods wholly contained in the set, as the set of points within a circle. |
open space fazâ-ye bâz (#) Fr.: espace ouvert A space of infinite volume without any boundary. Triangles which lie on the surface of an open space will have a sum of angles which is less than 180°. An open space has a negative → curvature. See also → open Universe, → closed space. |
open system râžmân-e bâz Fr.: système ouvert Thermodynamics: A system which can exchange both energy and matter with the surroundings. → closed system; → isolated system. |
open Universe giti-ye bâz (#) Fr.: Univers ouvert A → Freidmann-Lemaitre → cosmological model in which → space is → infinite and of → negative → curvature or → Euclidean, and which expands forever. |
open wff wff bâz Fr.: FBF ouverte In → predicate logic, a → well-formed formula with one or more → free occurrences of → variables. |
operability âpâridanigi, âpârešpaziri Fr.: opérabilité The capability of being put into use, operation, or practice. |
operable âpâridani, âpârešpazir Fr.: opérable Capable of operating or of being operated. |
operate âpâridan Fr.: opérer To function or work; to make something function or work. From L. operari "to work, labor," L. opus "a work, labor, exertion," Av. *āpah-, *apah- "to do, operate," see below, Skt. ápas- "work, action, religious act;" O.H.G. uoben "to start work, to practice, to honor;" Ger. üben "to exercise, practice;" Du. oefenen; O.E. æfnan "to perform, work, do," afol "power"); PIE base *op- "to work, perform." Âpâridan, from âpâr-, from Av. *āp(ah)- "to do, operate," as above, + suffix -ar (as in vadar- "weapon," zafar- "jaw," baēvar- "thousand," and so on), shifted to -âr, + -idan suffix of infinitives. The Av. *āpah- "to do, operate," is extant in Mod.Pers. xub "good;" Mid.Pers. hwp, xub "good;" from Av. huuāpah- "doing good work, masterly," from huu-, hv- "good" → eu- + āpah- "work, deed," hauuapanha- "creativity;" cf. Skt. sv-ápas- "doing good work, skillful;" PIE base *op-, as above. |
operating system (OS) râžmân-e âpâreš Fr.: système d'exploitation The program that, after being initially loaded into the → computer by a boot program, → manages all the other → programs in a computer. |
operation âpâreš Fr.: opération 1) General: An act or instance, process, or manner of functioning or operating. Verbal noun of → operate |
operational âpâreši Fr.: opérationnel Pertaining to a process or series of actions for achieving a result. Adj. of → operation. |
operational calculus afmârik-e âpâreši Fr.: calcul opérationnel A method of mathematical analysis which in many cases makes it possible to reduce the study of differential operators, pseudo-differential operators and certain types of integral operators, and the solution of equations containing them, to an examination of simpler algebraic problems. It is also known as operational analysis. → operational; → calculus. |
operationalism âpârešbâvari Fr.: opérationalisme In the philosophy of science, the view that → concepts are defined in terms of measuring operations which determine their applicability. Same as operationism. |
operator âpârgar Fr.: opérateur Math.: Something that acts on another function to produce another function. In linear algebra an "operator" is a linear operator. In calculus an "operator" may be a differential operator, to perform ordinary differentiation, or an integral operator, to perform ordinary integration. |
Ophelia Ofeliyâ (#) Fr.: Ophélie A small satellite of → Uranus, the second nearest to the planet, discovered from the images taken by the Voyager 2 spacecraft in 1986. Also denoted Uranus II, it has a diameter of 32 km. Ophelia is one of the two → shepherd moons that keep the planet's Epsilon ring, the other being → Cordelia. Ophelia is the daughter of Polonius in Shakespeare's Hamlet. |
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