Fr.: théorie de la relativité
The → theory of relativity.
1) The state or quality of being reliable.
Fr.: gravité répulsive
A property of a → conductor which is defined as the ratio of the → electric intensity (E) to the → current density (J): ρ = E/J. The greater the resistivity, the greater the intensity needed to establish a given current density, or the smaller the current density for a given intensity. A "perfect" conductor would have zero resistivity, and a "perfect" → insulator an infinite resistivity.
1) The state or fact of being responsible, answerable, or accountable for something
within one's power, control, or management.
A performance criterion for an electronic detector, the ratio of the detector's electrical output to its optical input.
Rosseland mean opacity
kederi-ye miyângin-e Rosseland
Fr.: opacité moyenne de Rosseland
The → opacity of a gas of given composition, temperature, and density averaged over the various wavelengths of the radiation being absorbed and scattered. The radiation is assumed to be in → thermal equilibrium with the gas, and hence have a → blackbody spectrum. Since → monochromatic opacity in stellar plasma has a complex frequency dependence, the Rosseland mean opacity facilitates the analysis. Denoted κR, it is defined by: 1/κR = (π/4σT3) ∫(1/kν) (∂B/∂T)νdν, summed from 0 to ∞, where σ is the → Stefan-Boltzmann constant, T temperature, B(T,ν) the → Planck function, and kν monochromatic opacity (See Rogers, F.J., Iglesias, C. A. Radiative atomic Rosseland mean opacity tables, 1992, ApJS 79, 507).
Fr.: vitesse de rotation
Fr.: scalibilité, extension graduelle, évolutivité, facteur d'échelle, extensibilité
The ability of something, especially a computer system, to adapt to increased demands.
Fr.: densité scalaire
Fr.: singularité de Schwarzschild
The quality of the practices and theories that aim at establishing reproducible regularities in phenomena by using experimental method and providing a clearly formulated description.
Fr.: instabilité séculaire
Instability caused by a slow dissipation of energy.
Fr.: stabilité séculaire
1) The condition in which the equilibrium configuration of a system is
stable over long periods of time.
1) Freedom from care, anxiety, or doubt; well-founded confidence.
The → gravitational attraction of a system of masses, such of a planet, that allows the system to be held together by their mutual gravity. Self-gravity between atoms allows a → star to hold together, despite tremendous temperature and pressure. Similarly, to be considered a → planet, a body must have enough mass so that its self-gravity pulls it into a near-spherical shape.
The property of being → self-similar.
1) Capacity for sensation or feeling; responsiveness to sensory stimuli.
1) The required brightness for an object in order to be detected by an observing instrument.
A highly sensitive telescope can detect dim objects, while a telescope
with low sensitivity can detect only bright ones.
State noun from → sensitive.