tâbeš-e nâgarmâyi (#)
Fr.: rayonnement non thermique
The electromagnetic radiation whose characteristics do not depend on the temperature of the emitting source. In contrast to → thermal radiation, it has a different spectrum from that of → blackbody radiation. The three common types of non-thermal radiation in astronomy are: → synchrotron radiation, → bremsstrahlung radiation, and → maser → stimulated emission.
Fr.: spectre non thermique
A radio emission with a negative → spectral index. In this type of emission the intensity of the emitted radiation increases with wavelength.
Fr.: non zéro, non nul
Not equal to zero.
Fr.: polynôme non nul
Fr.: diffusion incohérente
The absorption of a photon and its re-emission at a different frequency (in the observer's frame of reference) by scattering atoms.
Fr.: plasma non-collisionnel:
A plasma in which the → mean free path of the charged particles between two collisions is much larger than the size of the system containing the plasma.
Fr.: équation non-dimensionnelle
An equation that is independent of the units of measurement as it only involves nondimensional numbers, parameters, and variables.
Fr.: non vide
Describing something that is partially or totally occupied.
Fr.: ensemble non vide
Fr.: non existence
Fr.: non flou
Fr.: ensemble non flou
Fr.: système non holonomique
A mechanical system with constraints on their velocity that are not derivable from position constraints. Nonholonomic systems arise, for instance, in mechanical systems that have rolling contact (for example, the rolling of wheels without slipping) or certain kinds of sliding contact (such as the sliding of skates). They are a remarkable generalization of classical Lagrangian and Hamiltonian systems in which one allows position constraints only.
Fr.: non homogène
Not homogeneous. → nonhomogeneous linear differential equation.
nonhomogeneous linear differential equation
hamugeš-e degarsâne-yi-ye xatti nâhamgen
Fr.: équation différentielle linéaire non homogène
A → linear differential equation if Q(x)≠ 0 on interval I.
The quality of an atom that has neither lost nor gained any electrons.
Not a linear function of the relevant variables.
Fr.: dispositif non-linéaire
An electronic device whose output is not directly proportional to its input. For example, in a → diode the current is a nonlinear function of the voltage; its voltage-current characteristics do not obey → Ohm's law.
Fr.: dynamique non-linéaire
Same as → chaos.
Fr.: instabilité non-linéaire
The instability of a physical or mathematical system that arises from the nonlinear nature of relevant variables and their interactions within the system.