Fr.: erreur fortuite
The fluctuating part of the overall error that varies from measurement to measurement. Normally, the random error is defined as the deviation of the total error from its mean value; opposite of → systematic error.
âzmâyešhâ-ye kâturé (#)
Fr.: expériences aléatoires
Statistics: Experiments in which results will not be essentially the same even though conditions may be nearly identical.
Fr.: bruit aléatoire
Unpredictable noise comprising large numbers of frequent, transient impulses occurring at statistically random time intervals. Thermal noise is a form of random noise.
Fr.: échantillon aléatoire
A sample selected at random from a population.
Fr.: structure aléatoire
Crystalline arrangement in which equivalent positions are not necessarily occupied by atoms of a single kind.
random thermal motion
jonbeš-e garmâyi-ye kâturé
Fr.: mouvement thermique aléatoire
Fr.: variable aléatoire
A quantity that takes different real values as a result of the outcomes of a random event or experiment involving specified probabilities.
Fr.: marche aléatoire, ~ au hasard
The trajectory consisting of a series of successive moves in which the direction and size of each move is randomly determined.
Arrangement of data in such a way as to simulate chance occurrence.
Verbal noun of → randomize.
Fr.: répartir au hasard
To arrange or select in a random manner in order to reduce bias and interference caused by irrelevant variables.
Verbal form of → random.
The property of being random.
State, condition noun of → random.
1) bord; (#) 2), 3) gostaré (#)
Fr.: 1) portée; 2), 3) étendue
1) Physics: The maximum distance a projectile travels.
M.E., from O.Fr. range "range, rank," from rangier "to place in a row, arrange," from reng "row, line."
1) Bord past stem of bordan "to carry, transport"
O.Pers./Av. bar- "to bear, carry," barəθre "to bear
(infinitive)," Skt. bharati "he carries," Gk. pherein,
L. fero "to carry;" PIE base *bher- "to carry").
Position, in a series arranged in order, on the basis of some principle of arrangement, with reference to the other items or values in the series.
M.E., from O.E. ranc "proud, overbearing, showy," from O.Fr. renc, ranc, rang "row, line;" cf. Dan. rank "right, upright," Ger. rank "slender," O.N. rakkr "straight, erect," perhaps from PIE *reg- "to stretch, straighten," cognate with Pers. râst, → right.
Rotbé, loan from Ar. ratbat "rank."
Fr.: échelle Rankine
A temperature scale in which the degree intervals are the same size as in the → Fahrenheit scale, but 0 is set at absolute zero, -459.69 °F. Therefore, 1 degree Rankine is equal to exactly 5/9 → kelvin. It was formerly used by engineers in English-speaking countries, but is now obsolete. See also → Celsius scale, → Kelvin scale, → Reaumur scale.
Named for the British physicist and engineer William John Rankine (1820-1872); → scale.
Fr.: conditions de Rankine-Hugoniot
Hydrodynamics → conservation laws (which can be extended to → magnetohydrodynamics, MHD) which describe the physical conditions of material across a → shock front. A fluid is completely described by its velocity, density, pressure, specific heat ratio, and magnetic field (in the MHD case). Mass, momentum, and energy fluxes are conserved in the shock, leading to the Rankine-Hugoniot relations. Also called Rankine-Hugoniot jump conditions. See also → jump condition.
qânun-e Raoult (#)
Fr.: loi de Raoult
The → vapor pressure of an ideal → solution is dependent on the vapor pressure of each chemical component and the → mole fraction of the component present in the solution. This means that the addition of → solute to a liquid lessens the tendency for the liquid to become a → solid or a → gas. For example, the addition of → salt to water causes the water to freeze below its normal → freezing point (0°C) and to boil above its normal → boiling point (100°C).
After François-Marie Raoult (1830-1901), the French chemist who studied the physical properties of chemical solutions; → law.
Occurring within a short time; happening speedily; moving or acting with great speed; swift (Dictionary.com).
From L. rapidus "tearing away, seizing, swift," from rapere "to hurry away, seize, plunder;"
Tond "swift, rapid, brisk; fierce, severe" (Mid.Pers. tund "sharp, violent;" Sogdian tund "violent;" cf. Skt. tod- "to thrust, give a push," tudáti "he thrusts;" L. tundere "to thrust, to hit" (Fr. percer, E. pierce, ultimately from L. pertusus, from p.p. of pertundere "to thrust or bore through;" PIE base *(s)teud- "to thrust, to beat").
Fr.: source à sursaut rapide
An object with technical designation MXB 17302335 which is characterized by erratic and extremely intense → X-ray emissions. The Rapid Burster is a → binary system comprising a → low-mass star as its → primary and a → secondary → neutron star. The → gravitational attraction of the neutron star strips its → companion of some of its gas, which then forms an → accretion disk and spirals toward the neutron star. The Rapid Burster is located at a distance of 110 kpc in the highly reddened → globular cluster Liller 1. It is a → low-mass X-ray binary (LMXB) and a recurrent → X-ray transient. So far less than 200 LMXBs have been detected in the → Galaxy and the → Magellanic Clouds. All produce a persistent flux of X-rays, the result of a release of → gravitational potential energy. Approximately 40 of them also exhibit → Type I bursts which are due to → thermonuclear flashes on the surface of a neutron star. The Rapid Burster is unique among the LMXBs in that it produces X-ray bursts in quick succession. These are called → Type II bursts, and they result from a spasmodic release of gravitational potential energy, which is due to some unknown → accretion disk instability (Lewin et al., 1996, ApJ 462, L39).
rapidly oscillating Ap star
Fr.: étoile Ap à oscillation rapide
A chemically peculiar star characterized by the presence of high-frequency non-radial oscillations, with periods that range between about 4 and 16 min. These variations have periods from about 5 to 20 minutes and low amplitudes (B < 10 mmag). They are consistent with acoustic (→ p mode) pulsations of low degree and high radial overtone.
A part of a river where the current runs very swiftly. See also → torrent.