Dominant wavelength

The coarsening process (growth of dominant wavelength) takes place during the approach to equilibrium as well. We carried out simulations verifying this. We started the process with 2 dimensional sine wave initial conditions, and with no incident flux, so that the surface relaxed towards a plane. After a short transient (during which the... 

Table 17.1 presents the physical properties of the star anise essential oil. The colour of the steam-distilled oil samples was greenish-yellow and that of oils from liquid C02 extraction was yellow. This can also be seen by the difference between the average dominant wavelength for liquid C02 extraction and that for steam distillation. 

Group Ill-nitride DH blue LEDs were grown and fabricated on SiC substrates. The devices produce up to 1.8 mW of light with a dominant wavelength of 466 nm. The use of a conducting AlGaN buffer layer on SiC allows for true vertical current flow between the substrate and the nitride structure. The electrical and thermal conductivities of SiC make it a viable substrate material for heteroepitaxial nitride growth. 

Another method of expressing color is in terms of luminance, dominant wavelength, and excitation purity. These latter are roughly equivalent to the three recognizable attributes of color lightness, hue, and saturation. Lightness is associated with the relative luminous flux, reflected or transmitted. Hue is associated with the sense of redness, yellowness, blueness, and so forth. Saturation is associated with the strength of hue or the relative admixture with white. The combination of hue and saturation can be described as chromaticity. 

Achromatic colors are white, black, and gray. Black and gray differ from white only in their relative reflection of incident light. The purples are nonspectral chromatic colors. All other colors are chromatic for example, brown is a yellow of low lightness and low saturation. It has a dominant wavelength in the yellow or orange range. 

The strontium formulation shows a reasonably high red color purity as can be seen from the chromaticity diagram in Fig. 2.19a. The color purity (pe) of a visible flare with the chromaticity (x, y) is its difference from the illuminant s white point relative to the furthest point on the chromaticity diagram with the same hue (dominant wavelength for monochromatic sources) where (x , y ) is the chromaticity of the white point and (x7, y7) is the point on the perimeter whose line segment to the white point contains the chromaticity of the stimulus. 

Photoresist compositions consisting of pentafluoromethylvinyl carbonate derivatives, (II), were prepared by Yoon [2] and used in photosensitive polymers for exposure to light sources having a dominant wavelength of less than 157 nm. Perfluorovinyl ether, (III), monomers were prepared by DiPietro [3] and used in lithographic photoresist polymer compositions. 

Figure 1. Range of applicability of different modeling approaches as a function of the system length. Current device sizes and the dominant wavelength X and mean free path A for silicon at 300K are also shown.

Fig. 3-3. Color designation in the CIE-Yxy system. Colors lie within the solid lines resembling a shoe sole. Colors within that plane may be given either by the Cartesian coordinates x and y, or by the dominant wavelength, [nm], and the excitation purity, Pg. The lightness, Y, is normal to the plane. (Scheinost and Schweitmann 1999 with permission)...

It will be apparent that the fully saturated colours are situated on the spectral loci curve, and saturation decreases as the central white portion is approached. A colour inside the chromaticity chart may be looked upon as the hue of the dominant wavelength, together with a measure of desaturation caused by the addition of surplus light of other wavelengths. With the additive primaries this tends to promote whiteness by increasing the spectral distribution of the reflected or emitted light. 

The dominant wavelength is determined by extending a line drawn from the point of equienergy white, through the situation of the colour value, until it reaches the spectral loci curve, when the point at which it crosses... 

The saturation varies from zero at the equienergy point to 100 per cent at the spectral location of the dominant wavelength. Saturation can be expressed as colorimetric purity which is ... 

We see that there is a fastest-growing linear mode near k = 0.7. If all initial perturbations with k2 < 1 started with the same initial amplitude, the mode with wavelength /. 2tt/0.7 would have the largest amplitude, and we might expect to see it as the dominant wavelength... 

USEPA 1 Calculation of tristimulus values from transmittance values Dominant wavelength (nm) Hue, luminance (%) Purity (%) Use of a set of wavelengths (between 410 and 670 nm)... 

The isothermal lines on the test surface can be evaluated from the measured dominant wavelength distribution reflected from the liquid crystal surface. In a transient test, the surface temperature can be evaluated from the one-dimensional conduction equation in a semiinfinite domain ... 

When Tomokita s simple structure is compared with the complex interconnected structure shown in Figure 12, one observation is obvious. The three-dimensional interconnectivity of the structure provides numerous branch points many are closer together than the dominant wavelength. Because of this short range interconnectivity, breakdown of structure is prevented during... 

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