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multiple exposures nurdâd-e bastâyi Fr.: poses multiples The division of a relatively long exposure into several successive shorter ones, e.g. to avoid detector saturation. |
multiple integral dorostâl-e bastâyi Fr.: intégrale multiple A series of successive integrations in which the integral operator acts on the result of preceding integration. |
multiple scattering parâkaneš-e bastâyi Fr.: diffusion multiple A process of → radiative transfer in which more than one → scattering event may be of importance before → transmission, → reflection, or → absorption. In → radiation-driven winds photon scattering can take place in different → spectral lines. Each scattering occurs in a different spectral line, and successive scatterings occur at lower energies (longer wavelength). The standard theory of line driving (→ CAK model) assumes that photons can be scattered only once in the wind, which is a reasonable assumption for normal → O stars. In → Wolf-Rayet stars, where photons evolve in an atmosphere with a strong → ionization stratification, multiple scattering is important. Indeed the strength of W-R winds appears to exceed the single scattering limit. → multiple; → scattering. |
multiple star setâre-ye bastâyi Fr.: étoile multiple A star which appears single but is in fact composed of more than two components. See also → multiple star system; → binary star; → triple star. |
multiple star system râšmân-e bastâyi Fr.: système multiple A stellar system composed of several stars bound together by gravitational attraction and revolving around a common center of mass. |
multiplet bastâyé Fr.: multiplet A group of spectral lines arising from transitions having a common lower energy level. From → multi- + -plet on the model of triplet. Bastâyé, from bastâ-→ multi- + euphonic -yé, from -é nuance suffix. |
multiplicand bastâšow Fr.: multiplicande A number to be multiplied by another. From L. multiplicandum, from multiplicandus "to be multiplied," gerundive of multiplicare, → multiply. Bastâšow, literally "that undergoes multiplication," from bastâ, → multiple, + šow, present stem and agent noun of šodan "to become, to be, to be doing, to go, to pass," from Mid.Pers. šudan, šaw- "to go;" Av. šiyav-, š(ii)auu- "to move, go," šiyavati "goes," šyaoθna- "activity; action; doing, working;" O.Pers. šiyav- "to go forth, set," ašiyavam "I set forth;" cf. Skt. cyu- "to move to and fro, shake about; to stir," cyávate "stirs himself, goes;" Gk. kinein "to move;" Goth. haitan "call, be called;" O.E. hatan "command, call;" PIE base *kei- "to move to and fro." |
multiplication bastâyeš Fr.: multiplication In general, the process of repeatedly adding a quantity to itself a certain number of times, or any other process which has the same result. Verbal noun of → multiply. |
multiplication sign nešâne-ye bastâyeš Fr.: croix de multiplication The sign used to indicate multiplication, either a times sign (×), a centered dot (·), or an asterisk. The multiplication sign was introduced by William Oughtred in 1631. → multiplication; → sign. |
multiplicative bastâyeši Fr.: multiplicatif Involving → multiplication. |
multiplicative identity idâni-ye bastâyeši Fr.: identité multiplicative The number which when used as the multiplier of another number leaves the second unchanged; one. → multiplicative; → identity. |
multiplicative inverse vârun-e bastâyeši Fr.: inverse multiplicative The number which when used as a multiplier of another number (except 0) produces 1. For example (1/5) x 5 = 1; each of the numbers is the multiplicative inverse of the other. → multiplicative; → inverse. |
multiplicity bastâyigi Fr.: multiplicité 1) The state of being multiple, made of several components. |
multiplier bastâgar Fr.: multiplicateur Arithmetic: A number by which another is multiplied. Physics: A device for intensifying some effect. Agent noun of → multiply. |
multiply bastâyidan Fr.: multiplier To make many or manifold; increase the number, quantity, etc., of. O.Fr. multiplier, from L. multiplicare "to increase," from multiplex (gen. multiplicis) "having many folds, many times as great in number," from multi- "many" + base of plicare "to lay, fold, twist." Bastâyidan, from bastâ, → multiple, + -idan infinitive suffix. |
multipole basqotbé Fr.: multipôle An entity consisting of several poles. |
multipole index dišan-e basqotbé Fr.: indice multipolaire A variable used in → spherical harmonic expansions. Each spherical harmonic is characterized by its multipole index l: l = 0 for a → monopole, l = 1 for a → dipole, and so on. It is used in particular to describe the → cosmic microwave background anisotropy: ΔT/T_{0} (θ,φ) = Σ a_{lm}Y_{lm}(θ,φ), where θ and φ are the → spherical polar coordinates, Y_{lm} is the → spherical harmonic functions, and the sum runs over l = 1, 2, ..., ∞ and m = -l, ..., l, where the multipole index l corresponds to angular scales ≅ 180°/l. |
multipole moment gaštâvar-e basqotbé Fr.: moment multipolaire The quantity that gives the electric potential field due to a distribution of charges, such as a → dipole, → quadrupole, → octupole, etc. A multipole moment usually involves powers of the distance to the origin, as well as some angular dependence. |
multitude basiné Fr.: multitude 1) A great number. M.E., from O.Fr. multitude and directly from L. multitudo "a great number, a crowd; the common people," from multus "many, much," → multi-, + suffix -tudo "-tude." Basiné, from basin + superlative of bas "many, much," → multi-, + suffix -in + -é noun/nuance suffix (as bišiné, kaminé, etc.). |
multivariate basvartâ Fr.: multivarié Statistics: Having more than one → variable. |
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