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quadruple system râžmân-e cahârtâyi Fr.: système quadruple A stellar system consisting of four stars orbiting around a common → center of mass. |
quantum mechanical system râžmân-e kuântom mekâniki Fr.: système mécanique quantique A → physical system that is specified by a → wave function. → quantum; → mechanical; → system. |
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. |
rectilinear system râžmân-e râst-xatt Fr.: système rectilinéaire An optical system that is corrected for → distortion and → spherical aberration and therefore forms the image of a straight line as a straight line. → rectilinear; → system. |
relational system râžmân-e bâzâneši Fr.: système relationnel A database management system in which a relational data structure is used. → relational; → system. |
relaxed system râžmân-e vâhalidé Fr.: système relaxé A → dynamical system that has regained its → equilibrium. Especially a system in which the kinetic and potential energies obey a specific relationship known as the → virial theorem. P.p. from relax, → relaxation. |
ring system râžmân-e halqe-yi Fr.: système d'anneaux |
Roman numeral system râžmân-e adadhâ-ye Rumi Fr.: numération romaine A → number system in which letters represent numbers, still used occasionally today. The cardinal numbers are expressed by the following seven letters: I (1), V (5), X (10), L (50), C (100), D (500), and M (1,000). If a numeral with smaller value is written on right of greater value then smaller value is added to the greater one. If it is preceded by one of lower value, the smaller numeral is subtracted from the greater. Thus VI = 6 (V + I), but IV = 4 (V - I). Other examples are XC (90), CL (150), XXII (22), XCVII (97), CCCXCV (395). If symbol is repeated then its value is added. The symbols I, X, C and M can be repeated maximum 3 times. A dash line over a numeral multiplies the value by 1,000. For example V- = 5000, X- = 10,000, C- = 100,000, and DLIX- = 559,000. |
semidetached system râšmân-e nim-jodâ Fr.: système semi-détaché Same as → semidetached binary. → semi-; detached, p.p. of detach, from O.Fr. destachier (Fr. détacher), from des- "apart," + -tachier (as in atachier "to attach"); → system. Râžmân, → system; nim-jodâ, from nim-→ semi- + jodâ "separate," from Mid.Pers. yut "separate, different;" Av. yuta- "separate, apart." |
sexagesimal system râžmân-e šast-šasti Fr.: système sexagésimal A number system whose base is 60. It originated with the ancient Sumerians around 2000 B.C., was transmitted to the Babylonians, and is still used in modified form for measuring time, angles, and geographic coordinates. → sexagesimal; → system. |
SI system râžmân-e SI Fr.: système international The system of → SI units. → SI units. |
small solar system body jesm-e kucak-e râžmân-e xoršidi Fr.: petit corps du système solaire A term introduced by the → International Astronomical Union (August 2006) to name the → solar system bodies other than → planets and → dwarf planets. Small solar system bodies include → asteroids, → comets, and → meteoroids. |
solar system râšmân-e xoršidi Fr.: Système solaire The collective name for the Sun and all objects gravitationally bound to it. These objects are the eight planets, their 166 known moons, five dwarf planets, and billions of small bodies. The small bodies include asteroids, icy Kuiper belt objects, comets, meteoroids, and interplanetary dust. The solar system is roughly a sphere with a radius greater than 100,000 AU. Planets, satellites, and all interplanetary material together comprise only about 1/750 of the total mass. Geochemical dating methods show that the solar system chemically isolated itself from the rest of the Galaxy (4.7 ± 0.1) × 109 years ago. |
solar system abundance farâvâni-ye râžmân-e xoršidi Fr.: abondance dans le système solaire Same as → protosolar abundance. → solar system; → abundance. |
standard system râžmân-e estândé Fr.: système standard Photometric system used as a reference. |
star system râžmân-e setâre-yi Fr.: système stellaire Same as → stellar system. |
stellar system râžmân-e setâre-yi Fr.: système stellaire A system comprised of a group of stars bound by → gravitational attraction. Same as → star system. |
Stromgren system râžmân-e Strömgren Fr.: système de Strömgren A → photometric system, also called the → uvby system. → Stromgren sphere; → system. |
subsystem zir-râžmân Fr.: sous-système A coherent component of a larger system. |
supergalactic coordinate system râžmân-e hamârâhâ-ye abarkahkašâni Fr.: système des coordonnées supergalactiques A spherical → coordinate system in which the → equator is the → supergalactic plane. Supergalactic longitude, SGL, is measured → counterclockwise from direction l = 137.37 deg, b = 0 deg (between 0 and 360 deg). The zero point for supergalactic longitude is defined by the intersection of this plane with the → Galactic plane. In the → equatorial coordinate system (J2000) this is approximately 2.82 h, +59.5 deg. Supergalactic latitude, SGB, is measured from the supergalactic plane, positive northward and negative southward. The North Supergalactic Pole (SGB=90 deg) lies at galactic coordinates l = 47.37 deg, b = +6.32 degrees, corresponding to the equatorial coordinate system (J2000) 18.9 h, +15.7 deg. → supergalactic; → coordinate; → system. |
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