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Number of Results: 9 Search : partial

first-order partial derivative vâxane-ye pâri-ye râye-ye naxost Fr.: dérivée partielle du premier degré For a → → |

partial pâri (#), pârâl Fr.: partiel Being such in part only; not total or general; incomplete. M.E. |

partial derivative vâxane-ye pâri Fr.: dérivée partielle The derivative of a function of two or more variables, e.g., → |

partial differential equation hamugeš-e degarsâne-yi bâ vâxane-ye pâri Fr.: équation différentielle aux dérivées partielles A type of differential equation involving an unknown function (or functions) of several independent variables and its (or their) partial derivatives with respect to those variables. → |

partial eclipse gereft-e pâri Fr.: éclipse partielle An eclipse that is not total. → |

partial ionization zone zonâr-e yoneš-e pâri Fr.: zone d'ionisation partielle One of several zones of the stellar interior where increased
→ ^{+}↔ He^{++} + e^{-}), which occurs deeper at a
characteristic temperature of 4 x 10^{4} K.
The location of these ionization zones within the star
determines its pulsational properties. In fact if the
→ effective temperature of the star is ≥ 7500 K, the pulsation
is not active, because the ionization zones
will be located very near to the surface. In this region the density
is quite low and there is not enough mass available to drive the
oscillations. This explains the blue (hot) edge of the instability
strip on the → H-R diagram.
Otherwise if a star's surface temperature is
too low, ≤ 5500 K, the onset of efficient convection in its outer
layers may dampen the oscillations. The red (cool) edge of the
instability strip is believed to be the result of the damping effect of convection.
He^{+} ionization is the driving agent in → Cepheids.
See also → gamma mechanism.→ |

partial lunar eclipse mâhgereft-e pâri Fr.: éclipse partielle de lune A → |

partial solar eclipse xorgereft-e pâri Fr.: éclipse partielle de soleil A → |

partial truth râstini-ye pâri, ~ pârâl Fr.: vérité partielle A → |