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A philosophical doctrine that holds that → reason alone, unaided by experience, can arrive at basic truth regarding the world.
From → rational + -ism a Gk. suffix used in the formation of nouns denoting action or practice, state or condition, principles, doctrines, and so forth.
Râyan, → reason; xerad, → rational; bâvari, from bâvar "belief" (Mid.Pers. wâbar "beleif;" Proto-Iranian *uar- "to choose; to convince; to believe;" cf. Av. var- "to choose; to convince" varəna-, varana- "conviction, faith;" O.Pers. v(a)r- "to choose; to convince;" Skt. vr- "to choose," vara- "choosing").
âpâreš dar zamân-e hasyâ
Fr.: opération en temps réel
The operation of a computer during the actual time that the related physical processes take place so that the results can be used to guide the physical processes.
1) Act of regenerating; state of being regenerated.
→ re-; → generation.
1) The act or instance of registering.
Fr.: aberration relativiste
The aberration of light for an object moving with
→ relativistic speed. In contrast to the classical case,
the → Lorentz transformation between the
→ rest frame of the observer and that of the object
must be used. Relativistic aberration is expressed by the equation:
cos φ' = (cos φ -
→ relativistic; → aberration.
bâzsâzi (#), bâzgardâneš
The act or process of restoring such as → image restoration.
Verbal noun of → restore.
šetâb-e barâyand (#)
Fr.: accélération résultante
An acceleration that results from the vector addition of two or more distinct accelerations.
→ resultant; → acceleration.
Fr.: spectre rotation-vibration
The spectrum of a molecule resulting from the simultaneous rotation and vibration of its constituent atoms.
Physics: Degree of magnetization of a substance which cannot be exceeded
however strong the applied magnetizing field.
Verbal noun of → saturate.
jarayân-e anjâl, ~ anjâleš
Fr.: courant de saturation
The maximum current that can be obtained in a specific circuit under specified conditions.
→ saturation; → current.
darhâzeš-e anjâl, ~ anjâleš
Fr.: induction à saturation
The maximum intrinsic magnetic induction possible in a material.
→ saturation; → induction.
nešâl-e anjâl, ~ anjaalesh
Fr.: signal de saturation, ~ saturé
In radar, a signal whose amplitude is greater than the dynamic range of the receiving system.
→ saturation; → signal.
second generation star
setâre-ye âzâneš-e dovom
Fr.: étoile de deuxième génération
A star whose formation is induced by an older star itself formed previously in the same region. See also → stimulated star formation, → sequential star formation, → triggered star formation.
→ second; → generation; → star.
Fr.: aberration séculaire
The smallest component of the aberration of starlight which is caused by the motion of the solar system through space. → annual aberration; → diurnal aberration.
→ secular; → aberration.
Fr.: accélération séculaire
The apparent gradual increase in the → Moon's motion in its orbit, as measured relative to → mean solar time. Secular acceleration corresponds to an extremely gradual reduction in the speed of the → Earth's rotation. The slow-down of the Earth's spin comes mainly from → tidal frictions from the Moon. Historically, Edmond Halley (1656-1742) was the first to suggest that the Moon's mean rate of motion relative to the stars was gradually increasing. In 1693, Halley compared eclipses of recent, medieval, and classical Babylonian time, and discovered that the Moon's mean motion had been gradually increasing. Using Lunar Laser Ranging measurement, based on laser reflectors left by the Apollo astronauts on the Moon's surface (1969 to 1972), the secular acceleration is derived to be -25".4 ± 0".1 century 2 (Xu Huaguan et al., 1996, in Earth, Moon and Planets 73, 101). This corresponds to a linear increase of about 3.5 cm yr-1 in the mean Earth-Moon distance.
→ secular; → acceleration.
The act or process of separating. The place at which a division or parting occurs.
M.E., from O.Fr. separation, from L. separationem, from separare "to pull apart," from se- "apart" + parare "make ready, prepare."
Jodâyi state noun of jodâ "separate," from Mid.Pers. yut "separate, different;" Av. yuta- "separate, apart."
Fr.: énergie de séparation
The energy required to remove a particle (a proton or a neutron) from a particular atomic nucleus.
→ separation; → energy.
Fr.: concentration de Shapley
Same as the → Shapley supercluster.
Fr.: rapport signal sur bruit
Concept used to quantify the effects of noise. It is the ratio of a signal to the standard deviation of the signal.
Fr.: aberration sphérique, ~ de sphéricité
An aberration of a spherical lens or spherical mirror in which light rays converge not to a single point but to a series of points with different distances from the lens or mirror. Spherical aberration is corrected by using parabolic reflecting and refracting surface.
→ spherical; → aberration.
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