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Number of Results: 37 Search : phase

adiabatic phase fâz-e bidarrow Fr.: phase adiabatique Same as the → |

closure phase fâz-e bandeš Fr.: clôture de phase In astronomical interferometry, a method using triplets of telescopes in an array to calculate the phase information and get over the effects of atmospheric turbulence. The method, used in high-resolution astronomical observations, both at radio and at optical wavelengths, allows imaging of complex objects in the presence of severe aberrations. |

dephase vâfâzidan Fr.: déphaser To make two signals out of phase. For example, to get one signal at its highest peak while the other signal is at its lowest peak; they will be 180 degrees out of phase. |

dephased vâfâzidé Fr.: déphasé Same as → Past participle of → |

early AGB phase fâz-e AGB-ye âqâzin Fr.: phase initiale de l'AGB A fairly long-lived step in the evolution of → |

free expansion phase fâz-e gostareš-e âzâd Fr.: phase d'expansion libre The first phase of → ^{2}, which
leads to
v = (2_{e}E_{SN} / M)_{e}^{(1/2)},
where M is the ejected mass.
The schematic structure of the SNR at this phase can be described as follows: behind
the strong → _{e}shock front
which moves outward into the ISM, compressed interstellar gas
accumulates forming a → shell of interstellar gas.
This shell of swept-up material in front of shock
does not represent a significant increase in the mass of the system.
After some time the accumulated mass equals the ejected mass of stellar
material, and it will start to affect the expansion of the SNR. By definition,
this is the end of the free
expansion phase, and the corresponding radius of the SNR, called
→ sweep-up radius,
R_{SW}, is defined by
M = (4π/3) _{e}R_{SW}^{3}ρ_{0},
that is R_{SW} =
(3M / 4πρ_{e}_{0})^{(1/3)},
where ρ_{0} is the initial density of the ISM.
This radius is reached at the
sweep-up time t_{SW} = R_{SW}/v.
The free expansion phase lasts some 100-200 years until the
mass of the material swept up by the shock wave exceeds the mass of
the ejected material. Then the following → _{e}snowplow phase
starts. |

Hayashi phase fâz-e Hayashi Fr.: phase de Hayashi A period in the → R along a Hayashi track is of
the order of the → _{*}Kelvin-Helmholtz time:
t =
10_{KH}^{7}(M/_{*}M)_{sun}^{2}/(R/_{*}R)_{sun}^{3} yr.→ |

in phase hamfâz (#) Fr.: en phase The condition which exists when two waves of the same frequency pass through their maximum and minimum values in a correlated or synchronized way. |

initial phase angle zâviye-ye fâz-e âqâzin Fr.: angle de phase initial The value of the phase corresponding to the origin of time.
Same as the → |

lunar phase simâ-ye mâh (#) Fr.: phase de la lune One of the various changes in the apparent shape of the Moon, because as the Moon
orbits the Earth different amounts of its illuminated part are facing us.
The phases of the Moon include: the
→ |

orbital phase fâz-e madâri Fr.: phase orbitale In → |

orbital phase curve xam-e fâz-e madâri Fr.: courbe de la phase orbitale The photometric variability induced by the
→ |

out of phase nâfâz, nâ-ham-fâz Fr.: déphasé The condition of two oscillators that have the same frequency but different phases.
Opposed to → |

phase 1, 2) fâz; 3) simâ Fr.: phase 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 360° (or 2π radians), or, sometimes, as a number between 0
and 1. Two or more waves of the same frequency are
→ Mod.L. 1) |

phase angle zâviye-ye fâz (#) Fr.: angle de phase 1) |

phase curve xam-e fâz Fr.: courbe de phase 1) |

phase delay derang-e fâz 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. |

phase diagram nemudâr-e fâz 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. |

phase difference degarsâni-ye fâz 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. → |

phase equilibrium tarâzmandi-ye fâz Fr.: équilibre de phases The condition of temperature and pressure under which different phases (e.g. gas, liquid, and solid) of a substance coexist. → |