gerde-ye Ramsden, disk-e ~ (#)
Fr.: disque de Ramsden
The small circular patch of light visible in the back focal plane of an eyepiece.
Named after Jesse Ramsden (1735-1800), English maker of astronomical instruments; → disk.
cešmi-ye Ramsden (#)
Fr.: oculaire de Ramsden
An eyepiece consisting of two planoconvex lenses of the same focal length, placed with the convex sides facing each other and with a separation between the lenses of about two-thirds of the focal length of each.
Named after Jesse Ramsden (1735-1800), English maker of astronomical instruments; → eyepiece.
Fr.: aléatoire, au hasard
1) General: Made or occurring without a definite pattern, plan, or system;
haphazard arrangement as if due to pure chance.
M.E. raundon, random "impetuosity, speed," from O.Fr. randon "rush, disorder, impetuosity," from randir "to run fast."
Kâturé originally "dazzled, confused," variants katré "disorderly, ragged, tattered, babble, meaningless or incoherent speech," katreyi "disorderly, at random;" maybe from kat- "to fall;" → case.
random access memory (RAM)
barm bâ dastrasi-ye kâtruré
Fr.: mémoire à accès aléatoire
In computer technique, a configuration of memory cells that hold data for processing by a central processing unit (CPU). The term random derives from the fact that the CPU can retrieve data from any individual location, or address, within RAM.
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
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.