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Number of Results: 93 Search : equation

first degree equation hamugeš-e daraje-ye yekom Fr.: équiation du premier degré A equation in which the highest → |

first-order differential equation hamugeš-e degarsâne-yi-ye râye-ye naxost Fr.: équation différentielle du premier ordre A → → |

Fokker-Planck equation hamugeš-e Fokker-Planck Fr.: équation de Fokker-Planck A modified form of → After Dutch physicist Adriaan Fokker (1887-1972) and the German physicist Max Planck (1858-1947);
→ |

Fresnel equation hamugeš-e Fresnel Fr.: équation de Fresnel For an electromagnetic wave incident upon the interface between two media with
different indices of refraction, one of a set of equations that give the
→ → |

Friedmann equation hamugeš-e Friedmann Fr.: équation de Friedmann An equation that expresses energy conservation in an
→ Named after the Russian mathematician and physical scientist Aleksandr Aleksandrovich
Friedmann (1888-1925), who was the first to formulate an
→ |

gas equation hamugeš-e gâz Fr.: équation des gaz An equation that links the pressure and volume of a quantity of gas with the absolute temperature.
For a gram-molecule of a perfect gas, |

gravitational lens equation hamugeš-e adasi-ye gerâneši Fr.: équation de lentille gravitationnelle The main equation of gravitational lens theory that sets a relation between the angular position of the point source and the observable position of its image. → |

Hamilton's equation hamugeš-e Hamilton Fr.: équation de Hamilton One of a set of equations that describe the motion of a
→ p,
^{.}_{i} = - ∂H/∂q_{i}i = 1, ..., n.→ |

homogeneous linear differential equation hamugeš-e degarsâne-yi-ye xatti hamgen Fr.: équation différentielle linéaire homogène A → → |

hydrodynamic equation hamugeš-e hirdrotavânik Fr.: équation hydrodynamique
→ |

hydrostatic equation hamugeš-e hidristâik Fr.: équation hydrostatique The equation describing the → P and M are the mass and pressure of a spherical shell with thickness dr
at some distance r around the center of the star, ρ is
the density of the gas, and G the → gravitational constant.→ |

induction equation hamugeš-e darhâzeš Fr.: équation d'induction In magnetohydrodynamics, an equation that describes the transport of plasma and magnetic
field lines over time: t = ∇ x ( x v) +
η∇B^{2}, Bwhere
is the → Bmagnetic induction, is the
plasma velocity, and η = (μσ)v^{-1} the
→ magnetic diffusivity.
The first term on the right side represents → magnetic advection
and the second term → magnetic diffusion.
The induction equation can also be expressed as: ∂ /∂Bt = -(v.∇)B + (B.∇)v -
B(∇.v), where the terms of the right-hand side stand for advection, stretching, and compression, respectively. Among these terms, net increase of the field can be done only through the stretching and compression. |

integral equation hamugeš-e dorostâli Fr.: équation intégrale An equation involving an unknown function that appears as part of an integrand. |

Kepler's equation hamugeš-e Kepler Fr.: équation de Kepler An equation that enables the position of a body in an elliptical orbit to be
calculated at any given time from its orbital elements. It relates the
→ |

Lagrange's equations hamugešhâ-ye Lagrange Fr.: équation de Lagrange A set of second order → generalized velocities
q,
^{.}_{1}q, ...,
^{.}_{2}q,
the equations of the motion are of the form:
^{.}_{n}d/dt (∂T/∂q
(^{.}_{i}) -
∂T/∂q^{.}_{i} = Q_{i}i = 1, 2, ..., n), where T is the kinetic energy of the system and
Q the generalized force._{i}→ |

Lane-Emden equation hamugeš-e Lane-Emden Fr.: équation de Lane-Emden A second-order nonlinear → Named after the American astrophysicist Jonathan Homer Lane (1819-1880)
and the Swiss astrophysicist Robert Emden (1862-1940);
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Langevin equation hamugeš-e Langevin Fr.: équation de Langevin Equation of motion for a weakly ionized cold plasma. Paul Langevin (1872-1946), French physicist, who developed the theory of magnetic
susceptibility of a paramagnetic gas; → |

Laplace's equation hamugeš-e Laplace Fr.: équation de Laplace A → |

Layzer-Irvine equation hamugeš-e Layzer-Irvine Fr.: équation de Layzer-Irvine The ordinary Newtonian energy conservation equation when expressed in expanding
cosmological coordinates. More specifically, it is
the relation between the → W. M. Irvine, 1961, Ph.D. thesis, Harvard University;
D. Layzer, 1963, Astrophys. J. 138, 174; → |

Legendre equation hamugeš-e Legendre Fr.: équation de Legendre The → y = c,
where _{1}P_{n}(x) + c_{2}Q_{n}(x)P are _{n}(x)Legendre polynomials and
Q are called
_{n}(x)Legendre functions of the second kind.Named after Adrien-Marie Legendre (1752-1833),
a French mathematician who made important contributions to statistics,
number theory, abstract algebra, and mathematical analysis;
→ |