spectral brightness

См. также в других словарях:

• Brightness — is an attribute of visual perception in which a source appears to emit or reflect a given amount of light. In other words, brightness is the perception elicited by the luminance of a visual target. This is a subjective attribute/property of an… …   Wikipedia

• Spectral centroid — The spectral centroid is a measure used in digital signal processing to characterise an audio spectrum. It indicates where the center of mass of the spectrum is. Perceptually, it has a robust connection with the impression of brightness of a… …   Wikipedia

• Spectral envelope — In remote sensing using a spectrometer, the spectral envelope of a feature is the boundary of its spectral properties, as defined by the range of brightness levels in each of the spectral bands of interest. References *… …   Wikipedia

• Spectral energy distribution — A spectral energy distribution (SED) is a plot of flux, brightness, or flux density versus frequency or wavelength of light. It is used in many branches of astronomy to characterize astronomical sources. For example, in radio astronomy, an SED… …   Wikipedia

• National Synchrotron Light Source II — NSLS II Artist conception of the NSLS II General information Type Research and Development Facility Town or city …   Wikipedia

• ELETTRA — Synchrotron Light Laboratory is a national synchrotron laboratory located in Basovizza on the outskirts of Trieste, Italy.The facility, available for use by the Italian and international scientific communities, houses several ultrabright light… …   Wikipedia

• star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …   Universalium

• Variable star — A star is classified as variable if its apparent brightness as seen from Earth changes over time, whether the changes are due to variations in the star s actual luminosity, or to variations in the amount of the star s light that is blocked from… …   Wikipedia

• cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …   Universalium

• CIE 1931 color space — In the study of color perception, one of the first mathematically defined color spaces is the CIE 1931 XYZ color space, created by the International Commission on Illumination (CIE) in 1931.[1][2] The CIE XYZ color space was derived from a series …   Wikipedia

• Main sequence — A Hertzsprung Russell diagram plots the actual brightness (or absolute magnitude) of a star against its color index (represented as B V). The main sequence is visible as a prominent diagonal band that runs from the upper left to the lower right.… …   Wikipedia