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Number of Results: 115 Search : ram

reference frame cârcub-e bâzbord Fr.: système de référence A set of axes to which positions and motions in a system can be referred.
Same as → |

rest frame cârcub-e âram Fr.: référentiel au repos, repère ~ The → |

Rossby parameter pârâmun-e Rossby Fr.: paramètre de Rossby The northward variation of the Coriolis parameter, arising from the sphericity of the Earth. → |

size parameter pârâmun-e andâzé Fr.: paramètre de taille A quantity that defines the type of → |

slope parameter pârâmun-e šib Fr.: paramètre de pente In a → |

space-time diagram nemudâr-e fazâ-zamân (#) Fr.: diagramme espace-temps A simple way of representing the → |

spectrogram binân-negâš (#) Fr.: spectrogramme A plot of the intensity of light at different wavelengths obtained using a spectrograph. |

spectroheliogram hur-binâbnegâšt Fr.: spectrohéliogramme An image of the Sun taken in the light of one particular wavelength. |

spectroscopic Hertzsprung-Russell diagram (sHRD) nemudâr-e binâbnemâyik-e Hertzsprung--Russell Fr.: diagramme spectroscopique de Hertzsprung-Russell A spacial → → |

Stokes parameters pârâmunhâ-ye Stokes Fr.: paramètres de Stokes Four parameters which are needed to fully describe the
→ |

Tisserand's parameter pârâmun-e Tisserand Fr.: paramètre de Tisserand In celestial mechanics, a combination of orbital elements
commonly used to distinguish between comets and asteroids.
Objects whose Tisserand's parameter
value is smaller than 3 are considered to be dynamically cometary, and those with a value
larger than 3 asteroidal. Also called Named after François Félix Tisserand (1845-1896), French astronomer, Director of the Paris Observatory (1892). |

Toomre parameter pârâmun-e Toomre Fr.: paramètre de Toomre A quantity that measures the stability of a differentially rotating disk of matter
against → c is the → _{s}sound speed, κ the
→ epicyclic frequency, G the
→ gravitational constant, and
Σ the → surface density. The disk is linearly stable for
Q > 1 and linearly unstable for Q < 1.After Alar Toomre (1936-), an American astrophysicist of Estonian origin, professor of
mathematics at the Massachusetts Institute of Technology; → |

two-color diagram nemudâr-e do rang Fr.: diagramme deux couleurs A graph on which two color indices such as |

Venn diagram nemudâr-e Venn (#) Fr.: diagramme de Venn A schematic diagram using circles to represent sets and the relationships between them. Each circle represents one set. Two or more may be overlapped. The areas of overlap indicate subsets. Named after John Venn (1834-1923), a British logician and philosopher, who introduced
the diagram; → |

virial parameter pârâmun-e viriyâl Fr.: paramètre du viriel A dimensionless parameter that measures the ratio of thermal plus kinetic energies to
gravitational energy of a physical system, such as a molecular cloud. The virial
parameter is expressed as:
R and M are the radius and mass of the
cloud respectively, σ is the one-dimensional
→ velocity dispersion inside the cloud, and G
the → gravitational constant. It indicates whether a
cloud could be bound or not. For molecular clouds that are
confined by their surface pressure and for which self-gravity is unimportant,
α is much larger than unity, whereas _{vir}α
is ~ 1 when the gravitational energy of a clump becomes comparable to its kinetic energy.
See, e.g., Bertoldi & McKee, 1992 (ApJ 395, 140).
See also → _{vir}virial theorem. |

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