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Laser Interferometer Space Antenna (LISA) ânten-e fezâyi-e andarzanešsanj-e leyzeri Fr.: Observatoire d'ondes gravitationnelles par interférométrie laser A collaborative project between → NASA and → ESA to develop and operate a space-based gravitational wave detector sensitive at frequencies between 0.03 mHz and 0.1 Hz. LISA detects gravitational-wave induced strains in → space-time by measuring changes of the separation between fiducial masses in three spacecraft 5 million km apart. Ultimately, NASA and ESA decided in 2011 not to proceed with the mission. LISA was not the highest ranked mission in the 2010 Decadal Survey and funding constraints prevented NASA from proceeding with multiple large missions (http://lisa.nasa.gov). → LISA pathfinder. → laser; → interferometer; → space; → antenna. |
latent nahân (#) Fr.: latent Present but not visible, apparent, or actualized; existing as potential (Dictionary.com). → latent heat. From L. latentem (nominative latens), pr.p. of latere "to lie hidden." Nahân "concealed, hid; clandestine;" Mid.Pers. nihân "secrecy, a secret place, a hiding place," nihânik "concealed;" Av. niδāti- "deposing, deposit." |
latent heat garmâ-ye nahân (#) Fr.: chaleur latente The amount of → thermal energy that is absorbed or released by a unit amount of a substance in the process of a phase change under conditions of constant pressure and temperature. |
lensing potential tavand-e lenzeš Fr.: potentiel de l'effet de lentille gravitationnelle An important quantity in the characterization of → gravitational lensing. The lensing potential is obtained by projecting the three-dimensional Newtonian potential on the lens plane and by properly re-scaling it. It is a two-dimensional analog to the → gravitational potential. |
limb brightening rowšaneš-e labé Fr.: embrillancement centre-bord An observed increase in the intensity of radio, extreme ultraviolet, or X-radiation from the Sun from its center to its limb. → limb; → brightening. |
line intensity dartanuyi-ye xatt Fr.: intensité de raie A measure of the total effect of an absorption or emission line. The line intensity is equal to the integration of the absorption coefficient over the entire shape of the absorption line. |
luminous intensity dartanuyi-ye tâbeši Fr.: intensité lumineuse A measure of the amount of light that a point source radiates in a given direction. It is expressed by the luminous flux per unit leaving the source in the direction per unit of solid angle. |
magnetic intensity dartanuyi-e meqnâtisi Fr.: intensité magnétique Strength of a magnetic field at a point, denoted H. The force which could be exerted on unit north magnetic pole situated at that point. Measured in oersteds. Same as → magnetic field strength. |
magnetic tension taneš-e meqnâtisi Fr.: tension magnétique In → magnetohydrodynamic (MHD) treatment of → plasmas, that component of the → Lorentz force which is directed toward the centre of curvature of the → magnetic field lines and thus acts to straighten out the field lines. The Lorentz force can be decomposed into two components orthogonal to the magnetic field: j× B = (B . ∇) B / μ_{0} - ∇ (B^{2} / 2μ_{0}), where j is the → current density, μ_{0} is the → magnetic permeability of free space, and B is the → magnetic flux density. The left side term is the Lorentz force, the first term on the right side is the magnetic tension and the second term the → magnetic pressure. |
magnetic vector potential tavand-e bordâri-ye meqnâtisi Fr.: vecteur potentiel magnétique A vector field A defined so that the → magnetic field B is given by its → curl: B = ∇ x A. |
metric tensor tânsor-e metrik Fr.: tenseur métrique The abstract tensor operation which is computed in a particular → reference frame using the → metric components. The metric tensor defines magnitude and direction of vectors about a point. |
mitten dastmuž Fr.: moufle A hand covering enclosing the four fingers together and the thumb separately (Dictionary.com). → glove, → mitt. M.E. miteyn, from M.Fr., O.Fr. mitaine, from from O.Fr. mite "mitten," and from M.L. mitta. Dasmtuž, literally "hand-shoe" (Ger. Handschuh, "glove," literally "hand-shoe"), from dast, → hand, + Muž, variant of Pers. muzé "shoe," Mid.Pers. môg "shoe, boot;" cf. Pers. paymôz- / paymôxtan "to dress;" Av. (+ pati-paitišmaoc- "to shoe;" Proto-Ir. *(h)mauc-? "to dress, clothe" (Cheung 2007). |
Newtonian potential tavand-e Newtoni Fr.: potentiel newtonien A potential in a field of force obeying the inverse-square law such as → gravitational potential. |
nonexistence nâhastumandi, nâhasti Fr.: non existence Math.: The fact that no → solution exists for a given → problem. In mathematics, nonexistence usually is a matter of impossibility. |
oblateness paxi (#) Fr.: aplatissement The property possessed by a round body that is flattened at the poles. Noun from → oblate. |
often basvân Fr.: souvent Many times; frequently; in many cases. M.E. oftin, from O.E. oft "often, frequently," akin to cognates: O.Frisian ofta, Danish ofte, O.H.G. ofto, Ger. oft, of unknown origin. Basvân, from bas "many, much," → frequency, + -vân on the model of farâvân, → abundance. |
omnipotent visp-tavân (#) Fr.: omnipotent Having very great or unlimited power or authority. |
optical oblateness paxi-ye nuri Fr.: aplatissement optique (polar flattening) The ratio of the difference between equatorial and polar diameters to the equatorial diameter. A sphere has an oblateness of 0; an infinitely thin disk has an oblateness of 1 (Ellis et al., 2007, Planetary Ring Systems, Springer). → optical; → oblateness. |
order of a tensor râye-ye tânsor Fr.: ordre de tenseur The maximum number of the indices (→ index) of a tensor. |
parabolic antenna ânten-e sahmi (#) Fr.: antenne parabolique An antenna comprising a parabolic reflector with a receiving and/or transmitting element positioned at or near its focal point. |
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