angle of inclination
Fr.: angle d'inclinaison
1) General: The angle between one plane and another, or
the angle formed by a reference axis and a given line.
angle of minimum deviation
zâviye-ye kažraft kaminé
Fr.: angle de déviation minimale
The angle between the light entering and exiting the prism when the light passing through the prism is parallel to the prism's base. Angle of minimum deviation (D) is used to measure the → index of refraction (n) of the prism glass, because: n = sin [(A + D)/2]/sin (A/2), where A is the → prism angle.
angle of prism
Fr.: angle de prisme
→ prism angle.
angle of reflection
zâviye-ye bâztâb (#)
Fr.: angle de réflexion
The angle between the reflected ray and the normal to the reflecting surface.
angle of refraction
zâviye-yé šekast (#)
Fr.: angle de réfraction
The angle between the direction in which a ray is refracted and the normal to the refracting surface.
Angstrom unit (Å)
Fr.: unité d'Ångström
Unit of length used to describe wavelengths and interatomic distances. 1 Å = 10-10 m.
Named after Anders Jonas Ångström, Swedish physicist and astronomer who founded the science of spectroscopy and discovered by studying the solar spectrum that there is hydrogen in the Sun's atmosphere; → unit.
Having, forming, or consisting of an → angle or angles.
From L. angularis "having corners or angles," from angulus→ angle.
Zâviye-yi, adj. from zâviyé, → angle.
Fr.: accélération angulaire
The rate of change of → angular velocity. It is equal to the → first derivative of the → angular velocity: α = dω/dt =d2θ/dt2 = at/r, where θ is the angle rotated, at is the linear tangential acceleration, and r is the radius of circular path.
tarâmun-e zâviye-yi, qotr-e ~
Fr.: diamètre angulaire
The apparent diameter of an object in angular measure.
angular diameter distance
Fr.: distance angulaire
1) The ratio of an object's → linear size (l)
to its → angular size (δθ, in
→ radians), that is
DA = l/δθ.
It is used to convert observed angular separations into proper separations
at the source.
angular differential imaging (ADI)
tasvigari-ye degarsâne-yi-ye zâviye-yi
Fr.: imagerie différentielle angulaire
A high-contrast imaging technique that reduces minute temporal and spatial → seeing fluctuations and facilitates the detection of faint point sources, in close separation from their stars. It consists of the acquisition of a sequence of images with an → altazimuth mounting telescope while the instrument field derotator is switched off. This keeps the instrument and telescope optics aligned and allows the field of view to rotate with respect to the instrument. For each image, a reference → point spread function (PSF) is constructed from other appropriately selected images of the same sequence and subtracted to remove quasistatic PSF structure (Marois et al. 2006, ApJ 641, 556).
Fr.: dispersion angulaire
The rate of change of the angles of emergence θ of various wavelengths from a dispersing prism: dθ/dλ.
Fr.: distance angulaire
basâmad-e zaviye-yi (#)
Fr.: fréquence angulaire
The number of complete rotations per unit time, expressed in radian per second: ω = 2πν, where ν is the frequency (cycles per second).
angular kinetic energy
kâruž-e jonbeši-ye zâviye-yi
Fr.: énergie cinétique angulaier
Same as → rotational energy.
Fr.: moment angulaire, moment cinétique
angular momentum catastrophe
negunzâr-e jonbâk-e zâviye-yi
Fr.: catastrophe du moment angulaire
A problem encountered by the → cold dark matter model of galaxy formation. The model predicts too small systems lacking → angular momentum, in contrast to real, observed galaxies. → cusp problem; → missing dwarfs.
angular momentum parameter
pârâmun-e jonbâk-e zâviye-yi
Fr.: paramètre de moment angulaire
angular momentum problem
parâse-ye jonbâk-e zâviye-yi
Fr.: problème de moment angulaire
1) The fact that the Sun, which contains 99.9% of the mass of the
→ solar system, accounts for about 2% of the total
→ angular momentum of the solar system. The problem of outward
→ angular momentum transfer has been a main topic of interest for
models attempting to explain the origin of the solar system.
angular momentum transfer
tarâvaž-e jonbâk-e zâviye-yi
Fr.: transfert de moment angulaire