An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 53 Search : metric
 interferometric   اندرزنش‌سنجی، اندرزنش‌سنجیک   andarzanešsanji, andarzanešsanjikFr.: interférométrique   Of or relating to → interferometry.→ interferometer; → -ic. interferometric array   آرست ِ اندرزنش‌سنجی، ~ اندرزنش‌سنجیک   ârast-e andarzanešsanji, ~ andarzanešsanjikFr.: réseau interférométrique   A system of several telescopes coupled together in a particular configuration to carry out → interferometry.→ interferometric; → array. interferometric technique   تشنیک ِ اندرزنش‌سنجی، ~ اندرزنش‌سنجیک   tašnik-e andarzanešsanji, ~ andarzanešsanjikFr.: technique interférométrique   An observational technique based on principles of → interferometry.→ interferometric; → technique. metric   ۱، ۲) متریک؛ ۳) متری   1), 2) metrik (#); 3) metri (#)Fr.: métrique   1) A mathematical → expression consisting of an → array of → components which are needed for calculating → infinitesimally small → distances between two → points in some geometrical → space. More simply put, the → function used to define a distance between two points in a → metric space. Also called → distance function. 2) In → general relativity the metric describes the → space-time geometry and gives the interval between two neighboring → events. 3) Pertaining to the meter or to the → metric system.From → meter + → -ic. metric prefix   پیشوند ِ متری   pišvand-e metriFr.: préfixe du système international d'unités   Any of the suffixes adopted by the International System of Units (→ SI units). For numbers larger than 1: → deca- (101), → hecto- (102), → kilo- (103), → mega- (106), → giga- (109), → tera- (1012), → peta- (1015), → exa- (1018), → zetta- (1021), and → yotta- (1024) . For numbers smaller than 1: → deci- (10-1), → centi- (10-2), → milli- (10-3), → micro- (10-6), → nano- (10-9), → pico- (10-12), → femto- (10-15), → atto- (10-18), → zepto- (10-21), and → yocto- (10-24).→ metric; → prefix. metric space   فضای ِ متریک   fazâ-ye metrikFr.: espace métrique   An set of points such that the distance between every pair of points is defined by a → distance function with the following properties: 1) the distance from the first point to the second equals zero if and only if the points are the same, 2) the distance from the first point to the second equals the distance from the second to the first, and 3) the sum of the distance from the first point to the second and the distance from the second point to a third exceeds or equals the distance from the first to the third. In mathematical language, the properties, for a nonempty set X, can be expressed as: 1) d(x,y)≥ 0 and d(x,y) = 0 if and only if x = y. 2) d(x, y) = d(y,x) for all x, y ∈ X. 3) d(x,z)≤ d(x,y) + d(y,z) for all x, y, and z ∈ X. Also called → triangle inequality.→ metric; → space. metric system   راژمان ِ متری   râšmân-e metriFr.: système métrique   A standard system of measurement using decimal units, in which the units of length, time, and mass are meter, second, and kilogram respectively.→ metric; → system. metric tensor   تانسور ِ متریک   tânsor-e metrikFr.: 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.→ metric; → tensor. metric unit   یکای ِ متری   yekâ-ye metri (#)Fr.: unité métrique   A physical → measurement unit in the → metric system.→ metric; → unit. Minkowski metric   متریک ِ مینکوفسکی   metrik-e Minkofski (#)Fr.: métrique de Minkowski   The → metric that belongs to a four-dimensional → flat manifold and is given by ds2 = - dt2 + dx2 + dy2 + dz2. Three coordinates represent → space and the fourth coordinate is devoted to → time. The Minkowski metric underlies the → geometry of → special relativity. Compare → Robertson-Walker metric.In honor of Hermann Minkowski (1864-1909), Russian-born German mathematician, who introduced the concept of the four-dimensional nature of space-time; → metric. parametric equation   هموگش ِ پارامونی   hamugeš-e pârâmuniFr.: équation paramétrique   Any of a set of equations that defines the coordinates of the dependent variables of a curve or surface in terms of one or more independent variables or parameters.→ parametric; → equation. photometric   شید-سنجی، شید-سنجیک، نور-سنجی، نور-سنجیک   šidsanji, šidsanjik, nursanji, nursanjikFr.: photométrique   Pertaining to or related to → photometry.→ photometer + → -ic. photometric band   باند ِ شیدسنجیک، ~ نورسنجیک   bând-e šid-sanjik, ~ nur-sanjikFr.: bande photométrique   The range of → wavelengths allowed by a → filter used in a → photometric system.→ photometric + → band. photometric binary   دُرین ِ شید-سنجیک، ~ نور-سنجیک   dorin-e šidsanjik, ~ nursanjikFr.: binaire photométrique   A binary star whose binarity is detectable from its variability and light-curve that has certain specific characteristics.→ photometric + → binary. photometric calibration   کبیزش ِ شید-سنجیک، ~ سنور-سنجیک   kabizeš-e šidsanjik, ~ nursanjikFr.: calibration photométrique   A calibration which converts the measured relative magnitudes into an absolute photometry. photometric parallax   دیدگشت ِ شیدسنجیک   didgašt-e šidsanjikFr.: parallaxe photométrique   A method of deriving the distance of a star using its → apparent magnitude and the → absolute magnitude inferred from its → spectral type.This is a misnomer, because the method has nothing to do with parallax; → photometric; → parallax. photometric system   راژمان ِ شید-سنجیک، ~ نور-سنجیک   râžmân-e šidsanjik, ~ nursanjikFr.: 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: → AB magnitude system, → five-color system, → Stromgren system, → JHK system, → UBV system, → uvby system.→ photometric; → system. polarimetric   قطبش‌سنجی، قطبش‌سنجیک   qotbešsanji, qotbešsanjikFr.: polarimétrique   Of or relating to → polarimetry.→ polarimetry; → -ic. radiometric dating   سن‌یابی ِ تابش‌سنجیک، ~ تابش‌سنجی   senn yâbi-ye tâbeš-sanjik, ~ tâbeš-sanjiFr.: datation radiométrique   A dating method that uses measurements of certain radioactive isotopes to calculate the ages in years (absolute age) of rocks and minerals.→ radiometer; → dating. Riemannian metric   متریک ِ ریمانی   metrik-e RiemanniFr.: métrique riemannienne   A positive-definite inner product, (.,.)x, on Tx(M), the tangent space to a manifold M at x, for each x  ∈ M, which varies continually with x (Douglas N. Clark, Dictionary of Analysis, Calculus, and Differential Equations).→ Riemannian; → metric.

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