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linear momentum jonbâak-e xatti Fr.: quantité de mouvement linéaire The product of an object's → mass and → velocity. It is a → vector and points in the same direction as the velocity vector. Linear momentum is distinguished from → angular momentum. When there is no opportunity for confusion, usually the term momentum is used instead of linear momentum. |
linear perturbation theory negare-ye partureš-e xatti Fr.: théorie de perturbation linéaire Assumption that the variations in the plasma parameters, due to the presence of waves, are small (to the first order) as compared to the undisturbed parameters. This makes it possible to linearize equations by dropping out second order (and higher) nonlinear terms. → linear; → perturbation; → theory. |
linear polarization qotbeš-e xatti (#) Fr.: polarisation linéaire Of an electromagnetic radiation, a → polarization in which the electric vibrations are confined to one plane along the direction of propagation. Also called → plane polarization. See also → circular polarization. → linear; → polarization. |
linear programming barnâme-sâzi-ye xatti (#) Fr.: programmation linéaire A procedure for finding the maximum or minimum of a → linear function where the → arguments are subject to linear → constraints. For problems involving more than two variables or problems involving a large number of constraints, solution methods used are those that are adaptable to computers. A well-known such → algorithm is the → simplex method. → linear; → programmings. |
linear regression vâyâzi-ye xatti Fr.: regression linéaire In statistics, a regression method that establishes a linear relationship between two random variables. → linear; → regression. |
linear size andâze-ye xatti Fr.: taille linéaire The real, physical size, as opposed to angular size. |
linear system râžmân-e xatti Fr.: système linéaire Physics: A → dynamical system whose evolution is a linear process. If a change in any variable at some initial time produces a change in the same or some other variable at some later time, twice as large a change at the same initial time will produce twice as large a change at the same later time. |
linear velocity tondâ-ye xatti Fr.: vitesse linéaire The rate of change of the position of an object that is traveling along a straight path. In other words, the velocity of an object when its moving direction is not changing. For a given → angular velocity (ω), the linear velocity v of the particle is directly proportional to the distance of the particle from the center of the circular path: v = ω ×r. |
linearity xattigi Fr.: linéarité The property, condition, or state of being linear. |
linearization xatteš, xattâneš Fr.: linéarisation A process of reduction to linear form by appropriate change of variables or by approximation. Verbal noun of → linearize. |
linearize xattidan, xattânidan Fr.: linéariser To make linear; give linear form to. |
linearized differential equation hamugeš-e degarsâneyi-ye xatti Fr.: équation différentielle linéarisée A differential equation that has been derived from an original nonlinear equation. Linearized, p.p. of → linearize; → differential; → equation. |
linearly xattâné Fr.: linéairement In a manner characterized by first-degree algebraic terms. Adverb of → linear. |
linearly dependent xattâné vâbasté Fr.: linéairement dépendant A set of objects x_{1}, x_{2}, ..., x_{n} (→ vectors, → matrices, → polynomials, etc.) on a given set if there is a linear combination of them: a_{1}x_{1} + a_{2}x_{2} + ... + a_{n}x_{n}, which is zero, but at least one of the coefficients is non-zero. For example the binomials (2x + y) and (6x + 3y) are linearly dependent, since 3(2x + y) - (6x + 3y) = 0. |
linearly independent xattâné nâvâbasté Fr.: linéairement indépendant 1) A set of objects x_{1}, x_{2}, ..., x_{n}
(→ vectors, → matrices,
→ polynomials, etc.) if it si not
→ linearly dependent. → linearly; → independent. |
linearly polarized light nur-e qotbide-ye xatti Fr.: lumière polarisée linéairement Light exhibiting → linear polarization. |
LINER lâyner (#) Fr.: LINER A type of galactic nucleus that is defined by its spectral line emission. The lines are very weak, the most prominent ones being from low ionization states (such as [O II], [N II], [S II] and [OI]). There is so far no generally accepted interpretation of the spectra of liners. It is likely that galaxies of different histories may have their nuclei with liner-type spectra. → retired galaxy. Short for → Low-Ionization Nuclear Emission-line Region. The term liner was first introduced by T. M. Heckman (1980, A&A 87, 152). |
linewidth xatt-pahnâ (#), pahnâ-ye xatt (#) Fr.: largeur de raie 1) The range of frequencies or wavelengths over which
radiations are absorbed or emitted in a transition between a specific
pair of atomic energy levels. The full width is determined between
half-power points of the line. |
linguistic variable vartande-ye zabânik Fr.: variable linguistique One of several → input or → output variables of a → fuzzy logic system whose values are → words or → sentences from a natural language, instead of numerical values. → linguistic; → variable. |
linguistics zabânik (#), zabânšenâsi (#) Fr.: linguistique The study of the structure and evolution of → language, including → phonetics, → morphology, syntax, semantics. From linguistic, from linguistic, from linguist, from L. lingua, → language, + → ics. Zabânik, from zabân, → language, + -ik, → -ics. Zabânšenâsi, from zabân + šenâsi, → -logy. |
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