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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. |
multiple system râžmân-e bastâyi Fr.: système multiple 1) A system consisting of several → components. |
neutron star binary system râžmân-e dorin-e setârehâ-ye noroni Fr.: système binaire d'étoiles à neutron A → binary system composed of two → neutron stars. |
non-hierarchical multiple system râžmân-e bastâyi-ye nâpâygâni Fr.: système multiple non hiérarchique A → multiple star system that lacks the characteristics of a → hierarchical multiple system. → non-; → hierarchical; → multiple; → system. |
nonholonomic system râžemân-e nâharudâtik Fr.: système non holonomique A mechanical system with constraints on their velocity that are not derivable from position constraints. Nonholonomic systems arise, for instance, in mechanical systems that have rolling contact (for example, the rolling of wheels without slipping) or certain kinds of sliding contact (such as the sliding of skates). They are a remarkable generalization of classical Lagrangian and Hamiltonian systems in which one allows position constraints only. |
nonlinear system râžmân-e nâxatti Fr.: système non-linéaire A system in which small changes can result in large effects, and large changes in small effects. |
number system râžmân-e adadhâ, ~ adadi Fr.: système de numération Same as → numeral system. |
number system conversion hâgard-e râžmân-e adadi Fr.: conversion de système de numération The conversion of a → number system
with a given → base to another system with a
different base; such as the conversion of a → decimal number
(base 10) to a → binary number system
(base 2).
In order to convert a number into its representation in a different
number base, we have to express the number in terms of powers of the other base.
For example, to convert the decimal number 100 to base 3, we must figure out how to
express 100 as the sum of powers of 3. We proceed as follows: → number; → system; → conversion. |
numeral system râžmân-e adadi, é adadhâ Fr.: système de numération A set of → symbols and → rules for representing → numbers. Same as → number system. See also: → Greek numeral system, → Roman numeral system, → Indian numeral system. |
off-axis optical system râžmân-e nurik-e ap-âsé Fr.: système optique hors axe An → optical system in which the → optical axis of the → aperture is not coincident with the mechanical center of the aperture. |
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. |
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. |
optical system râžmân-e nuri, ~ nurik Fr.: système optique A collection of lens, prisms, mirrors, and/or other devices, placed in some specified configuration, to act on light (reflect, refract, disperse, polarize, etc.) and perform some definite optical function. |
orthorhombic crystal system râžmân-e boluri-ye ardâlowzik Fr.: système cristallin orthorhombique A → crystal system that has three mutually perpendicular axes, each of which is of a different length than the others. → orthorhombic; → crystal; → system. |
passive system râžmân-e akâr Fr.: système passif An electronic system which emits no energy, and is not detectable. |
periodic system râžmân-e dowreyi Fr.: système périodique Arrangement of the → chemical elements in the → periodic table. |
photometric system râžmân-e šidsanjik, ~ nursanjik Fr.: système photométrique A system of → magnitudes, each of them characterized by a set of
well-defined → passbands
(or → filters) with known
→ response curves. The system is defined by the values given for
the → standard stars.
See also: → photometric; → system. |
physical system râžmân-e fiziki Fr.: système physique A set of physical components chosen to study their relations. |
planetary ring system râžmân-e halqehâ-ye sayyâre-yi Fr.: système d'anneaux planétaires → Interplanetary dust and other small particles organized into thin, flat rings encircling a planet. The most spectacular planetary rings known are those around → Saturn, but the other three → giant planets of the solar system (→ Jupiter, → Uranus, and → Neptune) have their own ring systems. |
planetary system râžmân-e sayyâreyi Fr.: système planétaire A system composed of a star and all the celestial bodies bound to it by gravity, especially planets and their natural satellites. |
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