Spectrum color

Spektralanalyse, /. spectrum analysis, spektralanalytisch, a. spectroscopic, spectro-metric. — adv. by spectrum analysis. Spektral-apparat, to. spectroscopic apparatus, -beobachtung, /. spectroscopic observation, -bereich, -bezirk, to. spectral region, -farbe, /. spectral color, spectrum color, -gegend, /. spectral region, -lampe, /. spectrum lamp, -hnie, /. spectrum line, spectral line, -probe, /. spectrum test, -rohr, n.. -rohre, /. spectrum tube, spectral tube, -tafel, /. spectrum chart, spectral chart. 

Objective Evaluation of Color. In recent years a method has been devised and internationally adopted (International Commission on Illumination, I.C.I.) that makes possible objective specification of color in terms of equivalent stimuli. It provides a common language for description of the color of an object illuminated by a standard illuminant and viewed by a standard observer (H). Reflectance spectro-photometric curves, such as those described above, provide the necessary data. The results are expressed in one of two systems the tristimulus system in which the equivalent stimulus is a mixture of three standard primaries, or the heterogeneous-homogeneous system in which the equivalent stimulus is a mixture of light from a standard heterogeneous illuminant and a pure spectrum color (dominant wave-length-purity system). These systems provide a means of expressing the objective time-constant spectrophotometric results in numerical form, more suitable for tabulation and correlation studies. In the application to food work, the necessary experimental data have been obtained with spectrophotometers or certain photoelectric colorimeters. 

P = parent ion detected in mass spectrum. Color of complex p-y, pale yellow o, orange o-b, orange-brown c, colorless w, white d-g, deep-green b-g, blue-green r-b, red-brown d-p, dark-purple 1, lemon r, red g, green. H NMR data are available on all the compounds and P NMR on all the Pt-phosphine complexes 231). 

The VolSurf method was used to produce molecular descriptors, and PLS discriminant analysis (DA) was applied. The statistical model showed two significant latent variables after cross-validation. The 2D PLS score model offers a discrimination between the permeable and less permeable compounds. When the spectrum color is active (Fig. 17.2), red points refer to high permeability, whereas blue points indicate low permeability. There is a region in the central part of the plot with both red and blue compounds. In this region, and in between the two continuous lines, the permeability prediction is less reliable. The permeability model... 

In order to bring the photocell to a response that approximates the sensitivity of the human eye for the different parts of the visible spectrum, color-correcting filters are interposed that attenuate the ranges in which the normally used selenium cell is more responsive than the eye, i.e, below 0.53 and above 0.58 wavelength. Standard lamps are used for calibration. 

Spectrophotometry [ISV] (1881) n. An analytical instrumental technique for measuring color values by the relative intensity of the component spectrum colors. Broadly, a technique which, by measuring the absorption (or reflection) of electromagnetic... 

Major suppliers of pearlescent pigments include Daicolor-Pope Inc., EM Industries, Mearl Corp., and Spectrum Color Co. 

The spectrum contains most of the principal hues red, orange, yellow, green, blue, and violet. Additional hues are obtained from mixtures of red and blue light. These constitute the purple colors. Saturation pertains to the strength of the hue. Spectrum colors are highly saturated. White and grays have no hue and. 

Today, the original concept has been expanded to include materials without absorption in the visible region of the spectrum (color) and any two different phases, for example, gas-liquid and gas-solid, two immiscible liquids, etc. 

Table 5,1. Relationship between spectrum color and wavelength...

Spectrum color Wavelength (nm) Approximate description of color Typical wavelength (nm)... 

Visible spectrum colors (pneumonic) ROY G BIV (red, orange, yellow, green, blue, indigo, violet) -> See Table 1.1 in Ihe text Color, Frequency, and Wavelength of Electromagnetic Radiation... 

Emission spectrum, optical (plasma) The de-excitation spectrum (color) of atoms and molecules in a plasma. The intensity of the peaks in the spectrum will change with changes in the plasma parameters. 

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