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21-479: TLI may refer to: Thallium(I) iodide , a Thallium compound Transport Layer Interface , a networking application programming interface. Trans-lunar injection , a propulsive maneuver used to set a spacecraft on a trajectory which will arrive at the Moon. Tseng Laboratories, Inc., the full corporate name of Tseng Labs Tall Latte index , an economic index based on

42-500: Is a three-dimensional space ; that is, a color is specified by a set of three numbers (the CIE coordinates X , Y , and Z , for example, or other values such as hue , colorfulness , and luminance ) which specify the color and brightness of a particular homogeneous visual stimulus. A chromaticity is a color projected into a two-dimensional space that ignores brightness. For example, the standard CIE XYZ color space projects directly to

63-426: Is added to quartz and ceramic metal halide lamps that uses rare-earth halides like dysprosium , to increase their efficiency and to get the light color more close to the blackbody locus . Thallium iodide alone can be used to produces green colored metal halide lamps. Thallium(I) iodide is also used in trace amounts with NaI or CsI to produce scintillators used in radiation detectors. Natural thallium(I) iodide

84-491: Is different from Wikidata All article disambiguation pages All disambiguation pages Thallium(I) iodide TlI can be formed in aqueous solution by metathesis of any soluble thallium salt with iodide ion. It is also formed as a by-product in thallium-promoted iodination of phenols with thallium(I) acetate. Attempts to oxidise TlI to thallium(III) iodide fail, since oxidation produces thallium(I) triiodide , Tl I 3 . The room temperature form of TlI

105-471: Is the spectral radiant exitance of the light being viewed, and X ( λ ), Y ( λ ) and Z ( λ ) are the color matching functions of the CIE standard colorimetric observer , shown in the diagram on the right, and λ is the wavelength. The Planckian locus is determined by substituting into the above equations the black body spectral radiant exitance, which is given by Planck's law : where: and This will give

126-550: Is the temperature of the Planckian radiator whose perceived colour most closely resembles that of a given stimulus at the same brightness and under specified viewing conditions The mathematical procedure for determining the correlated color temperature involves finding the closest point to the light source's white point on the Planckian locus. Since the CIE's 1959 meeting in Brussels, the Planckian locus has been computed using

147-614: Is yellow and has an orthorhombic structure which can be considered to be a distorted NaCl structure. The distorted structure is believed to be caused by favourable thallium-thallium interactions, the closest Tl-Tl distance is 383 pm. At 175 °C the yellow form transforms to a red CsCl form. This phase transition is accompanied by about two orders of magnitude jump in electrical conductivity. The CsI structure can be stabilized down to room temperature by doping TlI with other halides such as RbI, CsI, KI, AgI, TlBr and TlCl. Thus, presence of impurities might be responsible for coexistence of

168-403: The CIE 1960 color space , also known as MacAdam's (u,v) diagram. Today, the CIE 1960 color space is deprecated for other purposes: The 1960 UCS diagram and 1964 Uniform Space are declared obsolete recommendation in CIE 15.2 (1986), but have been retained for the time being for calculating colour rendering indices and correlated colour temperature. Owing to the perceptual inaccuracy inherent to

189-688: The General Conference on Weights and Measures has revised its estimate of this constant, with the International Temperature Scale (and briefly, the International Practical Temperature Scale ). These successive revisions caused a shift in the Planckian locus and, as a result, the correlated color temperature scale. Before ceasing publication of standard illuminants , the CIE worked around this problem by explicitly specifying

210-402: The spectral radiance L ( λ , T ) of the black body instead of the spectral radiant exitance M ( λ , T ). However, this change only affects the absolute values of X T , Y T and Z T , not the values relative to each other . Since X T , Y T and Z T are usually normalized to Y T = 1 (or Y T = 100) and are normalized when x T and y T are calculated,

231-474: The Planckian locus in CIE XYZ color space. If these coordinates are X T , Y T , Z T where T is the temperature, then the CIE chromaticity coordinates will be Note that in the above formula for Planck's Law, you might as well use c 1L = 2 hc (the first radiation constant for spectral radiance ) instead of c 1 (the “regular” first radiation constant), in which case the formula would give

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252-414: The absolute values of X T , Y T and Z T do not matter. For practical reasons, c 1 might therefore simply be replaced by 1. The Planckian locus in xy space is depicted as a curve in the chromaticity diagram above. While it is possible to compute the CIE xy co-ordinates exactly given the above formulas, it is faster to use approximations. Since the mired scale changes more evenly along

273-457: The chromaticity ( x , y ) coordinates estimated from above to derive the corresponding ( u , v ), if a larger range of temperatures is required. The inverse calculation, from chromaticity co-ordinates ( x , y ) on or near the Planckian locus to correlated color temperature, is discussed in Correlated color temperature § Approximation . The correlated color temperature ( T cp )

294-564: The concept, it suffices to calculate to within 2 K at lower CCTs and 10 K at higher CCTs to reach the threshold of imperceptibility. The Planckian locus is derived by the determining the chromaticity values of a Planckian radiator using the standard colorimetric observer. The relative spectral power distribution (SPD) of a Planckian radiator follows Planck's law, and depends on the second radiation constant, c 2 = h c / k {\displaystyle c_{2}=hc/k} . As measuring techniques have improved,

315-503: The corresponding chromaticity space specified by the two chromaticity coordinates known as x and y , making the familiar chromaticity diagram shown in the figure. The Planckian locus, the path that the color of a black body takes as the blackbody temperature changes, is often shown in this standard chromaticity space. In the CIE XYZ color space , the three coordinates defining a color are given by X , Y , and Z : where M ( λ , T )

336-592: The cost of a cup of Starbucks coffee Taipei Language Institute , an institute for teaching Mandarin Chinese founded in 1956 The Lonely Island , an American comedy troupe The Living Infinite Trophic level index , an index used in New Zealand for measuring the nutrient content of a lake Term Life Insurance Temporal light interference , undesired degradation or malfunction of an equipment or system caused by light modulations Topics referred to by

357-553: The cubic and orthorhombic TlI phases at ambient conditions. Under high pressure, 160 kbar, TlI becomes a metallic conductor. Nanometer-thin TlI films grown on LiF, NaCl or KBr substrates exhibit the cubic rocksalt structure. Thallium(I) iodide was initially added to mercury arc lamps to improve their performance The light produced was mainly in the blue green part of the visible light spectrum least absorbed by water, so these have been used for underwater lighting. In modern times, it

378-926: The locus than the temperature itself, it is common for such approximations to be functions of the reciprocal temperature. Kim et al. use a cubic spline : The Planckian locus can also be approximated in the CIE 1960 color space , which is used to compute CCT and CRI, using the following expressions: This approximation is accurate to within | u − u ¯ | < 8 × 10 − 5 {\displaystyle \left|u-{\bar {u}}\right|<8\times 10^{-5}} and | v − v ¯ | < 9 × 10 − 5 {\displaystyle \left|v-{\bar {v}}\right|<9\times 10^{-5}} for 1000 K < T < 15 000 K {\displaystyle 1000\,K<T<15\,000\,K} . Alternatively, one can use

399-403: The same term [REDACTED] This disambiguation page lists articles associated with the title TLI . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=TLI&oldid=1153306174 " Category : Disambiguation pages Hidden categories: Short description

420-606: The understanding of the geochemical evolution of the planet Like all thallium compounds, thallium(I) iodide is highly toxic. Planckian locus In physics and color science , the Planckian locus or black body locus is the path or locus that the color of an incandescent black body would take in a particular chromaticity space as the blackbody temperature changes. It goes from deep red at low temperatures through orange , yellowish , white , and finally bluish white at very high temperatures. A color space

441-467: Was first discovered in a naturally occurring setting in 2017 as a orthorhombic polymorph called nataliyamalikite. Small grains were found embedded in mascagnite sourced from fumaroles at Avachinsky , a volcano in Russia's Kamchatka Peninsula that can reach temperatures of 640 °C (1,184 °F). The geologists that discovered it speculate that further research into this mineral is likely to add to

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