Affective matches of fabric and lighting chromaticity

This study investigates the impact of lighting colors on subjective judgments of fabric: in particular, whether the influence of lighting varies depending on fabric types and color combinations. We conducted two visual assessments. In Study 1 (N = 44), eight illuminants and six types of fabric were presented as cloth stimuli. Derived from the literature review, four sets of adjectives (humble-luxurious, cool-warm, old-new, and not preferred-preferred) were used as metrics. In Study 2 (N = 41), five sets of fabric color combination swatches were assessed under lighting conditions that were identical to those of Study 1. Three bipolar scales (ordinary-characterful, classic-modern, and soft-rigid), were employed from factor analysis along with three unipolar scales (luxurious, preferred, harmonious with lighting). The results showed that hue characteristics of lighting and cloth types influenced participants' perceptions of the fabric. Overall, white lighting with 4000 K was the most preferred and luxurious lighting across various types of clothes, while a pinkish white with 4700 K (duv = −0.0127) was the best matched in every color combination. In addition, there were interaction effects between lighting colors, clothes types, and fabric color combinations with regard to each of the perceptual qualities. This study provides empirical evidence for optimally match lighting colors with fabric in the presentation of fabric goods.     

Visual evaluation at scale of threshold to suprathreshold color difference

Visual evaluation experiments of color discrimination threshold and suprathreshold color‐difference comparison were carried out using CRT colors based on the psychophysical methods of interleaved staircase and constant stimuli, respectively. A large set of experimental data was generated ranged from threshold to large suprathreshold color difference at the five CIE color centers. The visual data were analyzed in detail for every observer at each visual scale to show the effect of color‐difference magnitude on the observer precision. The chromaticity ellipses from this study were compared with four previous published data, of CRT colors by Cui and Luo, and of surface colors by RIT‐DuPont, Cheung and Rigg, and Guan and Luo, to report the reproducibility of this kind of experiment using CRT colors and the variations between CRT and surface data, respectively. The present threshold data were also compared against the different suprathreshold data to show the effect of color‐difference scales. The visual results were further used to test the three advance color‐difference formulae, CMC, CIE94, and CIEDE2000, together with the basic CIELAB equation. In their original forms or with optimized K_L values, the CIEDE2000 outperformed others, followed by CMC, and with the CIELAB and CIE94 the poorest for predicting the combined dataset of all color centers in the present study. © 2005 Wiley Periodicals, Inc. Col Res Appl, 30, 198–208, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20106     

Color characteristics of Cu-Zn-Al alloys

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基于快速双边滤波的图像高光去除研究

在各向异性的物体中,高光被视为是漫反射分量以及镜面反射分量的一种线性组合。单幅图像的高光去除是计算机视觉中一项非常有挑战性的课题。很多方法试图将漫反射分量、镜面反射分量进行分离,然而这些方法往往需要图像分割等预处理过程,方法鲁棒性较差且比较耗时。基于双边滤波器设计了一种高效的高光消除方法,该方法利用最大漫反射色度存在着局部平滑这一性质,使用双边滤波器对色度的最大取值进行传播与扩散,从而完成整幅图像高光去除。方法采用一种加速策略对双边滤波器进行速度优化,与目前流行的方法相比,有效提升了方法的执行效率。与传统方法相比,该方法高光去除效果更好,处理速度更快,非常适用于一些实时应用的场合。     

化纤综合废水处理絮凝剂的筛选与应用

分别采用聚合氯化铝和聚合硫酸铝铁对化纤综合废水进行了絮凝反应对比实验,并对优选的聚合氯化铝的应用条件进行了研究。其最佳絮凝反应条件为:控制酸析反应的pH在2.20左右,絮凝反应前调节原水pH至5,絮凝剂最佳投加量为3‰,助凝剂选用阳离子型PAM,最佳投加量为3 ppm。絮凝反应使废水色度和COD分别下降67%和38%。     

染料型喷墨打印墨水色素的色度学分析

通过对四个打印机彩色三原色墨水的光谱透射率测定及色度学分析，得到每一颜色的三刺激值，色度坐标，比较了这4组三原色拼色的色域大小，彩度值，色相的主波长及补色波长。提出了三原色补色波长之间关系的一个经验公式：λcompl.M≌10/9（λcompl.Y） 10，及λcompl.M≌9/10（λcompl.C）-20，发现这4组三原色的补色波长与此公式有较好的适应性。     

废蜜生产焦糖的工艺研究

介绍一种利用废蜜生产焦糖的新工艺。对影响焦糖色率的添加剂，熬制温度、时间等因素进行了研究。     

NaxSr1-2xMoO4∶Eux^3＋的制备及其发光性能的研究

采用高温固相法结合电荷补偿方式2Sr2＋→Eu3＋＋Na＋,合成了适合白光LED的红色荧光材料NaxSr1-2xMoO4∶Eux^3＋（x=0.1、0.15、0.2,0.25、0.3）系列样品.对样品分别进行了X射线衍射（XRD）分析和荧光光谱的测定.测试结果表明,NaxSr1-2xMoO4∶Eu3x＋荧光粉可以被近紫外光（UV）（393 nm）和蓝光（463 nm）有效激发.通过探讨Na＋和Eu3＋的掺杂浓度对发光强度的影响,得出NaxSr1-2xMoO4∶Eux3＋系列样品的发光强度比SrMoO4：Eu3＋明显增加,且当掺杂量x=0.2时,NaxSr1-2xMoO4∶Eux3＋系列样品在616 nm处的发光强度最大.分析了NaxSr1-2xMoO4∶Eux3＋系列样品在380 nm紫外光激发下的色坐标,当Na＋和Eu3＋的掺杂量x=0.15时,样品的红色显色最强.     

高抗冲聚苯乙烯粒子发灰原因分析及对策

针对高抗冲聚苯乙烯（HIPS）生产过程中出现的粒子发灰现象,从原料、聚合和脱挥单元分析了原因,并采取了相应对策。结果表明:原料苯乙烯的含氧储存环境、聚丁二烯橡胶（BR）中挥发分及氯离子含量高是导致产品粒子发灰的主要原因;将苯乙烯存储由有氧环境改为氮气环境,严格控制 BR 中挥发分质量分数小于 0.5%,且优选线型低顺式BR,可有效降低 HIPS 产品粒子发灰的几率。