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Phad (γ UMa)
Phad, from Ar. al-Fakhidh (ad-Dubb) (
Faxez, from Ar., as above.
A hypothetical → planet which once was postulated to have existed between the orbits of → Mars and → Jupiter and its destruction supposedly led to the formation of the → asteroid belt. The idea of such a hypothetical planet was first put forward by the German astronomer Heinrich Wilhelm Olbers (1758-1840).
In Greek mythology Phaeton was the sun god Helios. Phaeton tried to drive his father's solar chariot but crashed after almost setting fire to the whole earth.
The tube or cavity, with its surrounding membrane and muscles, that connects the mouth and nasal passages with the esophagus (Dictionary.com). → throat.
From Gk pharynx (genitive pharyngos) "windpipe, throat."
Halq, loan from Ar.
1, 2) fâz; 3) simâ
1) A particular stage or point in a course, development,
or graph varying cyclically; the fractional
part of the period through which the time has advanced, measured from
some arbitrary origin. Phase
is measured like an angle, when a complete cycle is equivalent to a
phase of 360Â° (or 2π radians), or, sometimes, as a number between 0
and 1. Two or more waves of the same frequency are
→ in phase when their maxima and minima take place at the same
moments. Otherwise, they are said to be → out of phase
or that they have a → phase difference.
Mod.L. phases, plural of phasis, from Gk. phasis "appearance," from stem of phainein "to show, to make appear."
1) Fâz, loanword from Fr., as above.
zâviye-ye fâz (#)
Fr.: angle de phase
1) Physics: Of a → periodic wave,
the number of suitable units of angular
measure between a point on the wave and a reference point.
Fr.: courbe de phase
1) Astro.: A curve describing the → brightness
of a reflecting → natural satellite as a
function of its → phase angle.
Fr.: délai de phase
The ratio of the phase shift of a sinusoidal signal in transmission through a system to the frequency of the signal.
Fr.: diagramme de phases
A graph showing the equilibrium relationships between phases (such as vapor-liquid, liquid-solid) of a chemical compound, mixture of compounds, or solution.
Fr.: différence de phase
The difference of phase (usually expressed as a time or an angle) between two periodic quantities which vary sinusoidally and have the same frequency.
Fr.: équilibre de phases
The condition of temperature and pressure under which different phases (e.g. gas, liquid, and solid) of a substance coexist.
Fr.: fonction de phase
The variation in brightness of a target as the phase angle (the angle between Sun and observer as seen from the target) varies between 0Â° and 180Â°. The directional distribution of reflected (or scattered) radiation. The phase angle is the supplement of the scattering angle (the angle between the incident ray and the emerging ray); in other words, the sum of the phase angle and the scattering angle is always 180Â° (Ellis et al., 2007, Planetary Ring Systems, Springer).
Fr.: différence de phase
1) General: Same as → phase difference.
→ phase; lag, possibly from a Scandinavian source; cf. Norw. lagga "go slowly."
Fr.: blocage de phase
In electronics, a technique of adjusting the phase of an oscillator signal so that it will follow the phase of a reference signal.
→ phase; lock, from O.E. loc "bolt, fastening, enclosure;" cf. O.N. lok "fastening, lock," Goth. usluks "opening," O.H.G. loh "dungeon," Ger. Loch "opening, hole," Du. luck "shutter, trapdoor."
Fâz, → phase; bast "fastening, lock," from bastan, from Mid.Pers. bastan/vastan "to bind, shut," Av./O.Pers. band- "to bind, fetter," banda- "band, tie," Skt. bandh- "to bind, tie, fasten," PIE *bhendh- "to bind," cf. Ger. binden, E. bind, → band.
degarâhangeš-e fâz (#)
Fr.: modulation de phase
Modulation in which the phase angle of a sine-wave carrier is caused to depart from the carrier angle by an amount proportional to the instantaneous magnitude of the modulating wave.
vâgardâni-ye fâz, vâruneš-e ~
Fr.: inversion de phase
An angular shift in phase by 180Â°.
Fr.: décalage de phase
Any change in the phase of a periodic quantity or in the phase difference between two or more periodic quantities.
Fr.: espace des phases
Of a dynamical system, a six-dimensional space consisting of the set of values that the position and velocity can take together (x, y, z, vx, vy, vz). → velocity space.
phase transfer function (PTF)
karyâ-ye tarâvaž-e fâz
Fr.: fonction de transfert de phase
A measure of the relative phase in the image as function of frequency. It is the phase component of the → optical transfer function. A relative phase change of 180Â°, for example, results in an image with the black and white areas reversed.
Fr.: transition de phase
The changing of a substance from one phase to another, by → freezing, → melting, → boiling, → condensation, or → sublimation. Also known as phase transformation. A well known phase transition is the transition from → water to → ice. Phase transitions are often associated with → symmetry breaking. In water there is a complete symmetry under rotations with no preferred direction. Ice has a crystal structure, in which certain orientations in space are preferred. Therefore, in transition from water to ice the continuous rotational symmetry is lost.
Fr.: vitesse de phase
The speed at which any fixed phase (individual wave) in a → wave packet travels. It is expressed as vph = ω/k, where ω is the → angular frequency and k the → wave number. See also the → group velocity.