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北京石油化工学院2026年研究生招生接收调剂公告
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Colour measurements
The colour properties of the pigments were measured. A Hunter lab D25-2 colour/difference meter was used to measure and specify the colours of the samples prepared in comparison with the Bayer’s standard samples, based on the widely used “Commission Internationale de l’Eclairage” (CIE) system. The chromaticity co-ordinates x′, y′,and z′, for the coloured samples were calculated as follows:

x′=X/(X+Y+Z),y′=Y/(X+Y+Z),z′=Z/(X+Y+Z)

where x′, y′ and z′ denote chromaticity co-ordinates in the CIE. diagram, and X, Y, Z are the readings taken from the equipment representing the co-ordinates.The values of x′,y′ and z′ corresponding to the colour of any surface are independent of the reflection characteristic and the spectral distribution of the light that falls upon it.

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篮球少年: 金币+5, 翻译EPI+1, ★★★很有帮助 2014-09-20 13:19:57
颜色测量
测定所获得的颜料的颜色属性。用Hunter实验室D25-2颜色/差值计,参照Baye标准样品并基于广泛使用的CIE系统,测量并确定所制备样品的颜色。有色样品的色度坐标X',Y'和Z',用下式计算:
X'= X/(X + Y + Z)Y'= Y/(X + Y+ Z),Z'= Z/(X + Y+ Z)
其中X',Y'和Z'分别表示在CIE图中的色度坐标,而X,Y,Z则是代表坐标的仪器设备的读数。 x',Y'和Z'的值对应于任一表面的颜色,该颜色不受投射光反射特性及其光谱分布的影响。
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