Spectral influence of the normal LCD,blue-shifted LCD,and OLED smartphone displays on visual fatigue: A comparative study

In this study, we investigated the influence of the light spectra of the normal LCD, blue-shifted LCD, and OLED smartphone displays on visual fatigue based on subjective and objective measurements. The illuminance of the retinal photoreceptors was calculated for the three displays to quantify the components of the light spectra. The results showed that the accumulated visual fatigue decreased for the display with lower retinal illuminances of the S-, M-, and L-cones, and ipRGCs when the luminance and CCT were the same. In addition, the display with larger retinal illuminances of the M- and L-cones induced more visual fatigue related to dry eye. Hence, a slight shift of the blue light peak toward a longer wavelength is recommended for reducing visual fatigue. Furthermore, an evaluation model of the overall visual fatigue level is proposed.     

多功能综合体育馆的照明分级控制

本文简要介绍了某综合体育馆的照明设计,着重叙述了各场馆照明分级控制的作法.     

A simplified procedure for determining indoor daylight illuminance using daylight coefficient concept

The first step in evaluating the visual performance and energy efficiency provided by daylight requires an accurate estimation of the amount of daylight entering a building. The actual daylight illuminance of a room is mainly influenced by the luminance levels and patterns of the sky in the direction of view of the window at that time. The daylight coefficient concept, which considers the changes in the luminance of the sky elements, offers a more effective way of computing indoor daylight illuminances. Recently, Kittler et al. have proposed a new range of 15 standard sky luminance distributions including the CIE (International Commission on Illumination) standard clear sky. Lately, these 15 sky luminance models have been adopted as the CIE Standard General Skies. This paper presents a graphical method to calculate interior illuminance for the CIE standard clear sky using the daylight coefficient approach. The simplified techniques in the form of a nomograph and Waldram diagram were established and described. The performance of the proposed approach was evaluated against the results obtained by an independent calculation approach and a computer simulation program. It was shown that the daylight illuminances estimated by our graphical tool were in reasonably good agreement with those produced from the other two methods. The findings provide building professionals and students a reliable and simple alternative that incorporates the daylight coefficient concept to estimate the interior daylight illuminance and assess daylighting performance.     

《建筑外窗采光性能分级及检测方法》新旧标准的应用分析

结合工程实际，就CB／T11976-2002《建筑外窗采光性能分级及检测方法》与原标准CB11976—89在实际应用中的情况，逐条进行了对照分析，指出了各自的优缺点。     

照明质量在工业生产中的重要性与存在的问题

从照明的功能出发,剖析照明质量在工业生产活动中的重要性和工业照明的特点,重点论述了影响工业照明设计与照明质量的各个要素(如应充分满足工艺和工况环境要求,工业照明对照度、显色性、色温、眩光的要求,提高照度稳定性、照明系统的可靠性和安全性的措施等)。经实地考察,发现照明设计方案不贴近工序要求,灯具配光不合理,灯具布置欠妥等问题。     

不同照度下煤矸图像灰度及纹理特征提取的实验研究

研究煤和矸石在不同照度下的响应特性，设计了差异照度煤矸图像采集系统，进行了煤矸图像采集实验，建立了煤矸灰度子图像数据库，对数据库中的子图像的灰度、纹理特征进行了提取，通过定义归一化特征差异指数以及基于支持向量机(SVM)对实验数据进行了分析与讨论。结果表明:在同一照度下，煤和矸石在灰度及纹理特征上存在差异，且随着照度的改变，煤和矸石的特征也发生变化，同时两者的变化规律存在显著差异。基于不同特征的SVM分类器的识别正确率不同，照度的变化也会对分类器的识别正确率产生影响;当考虑照度因素后，分类器的识别正确率最大增加了13.31%，此外基于多特征多照度融合的SVM分类器性能较好，识别正确率为98-39%。     

隧道人口照度的安全性评价指标研究

以湖北省某山区高速公路的隧道工程为依托,选择了其中几个具有代表性的隧道进行了调研,得到了不同隧道进出口处的照度、车速、车速差等数据,构建了隧道入口处的照明过渡技术指标,通过回归分析得出了车速差与照明过渡指标的关系,评价了隧道出入1：7亮度过渡对隧道安全的影响。     

窑洞采光因素分析及改善研究

本文通过对甘肃平凉地区窑洞采光的具体测量,分析了采光影响因素,提出了改善采光的设计方法和改造措施。首先,参考不同窑洞的照度,综合分析了光气候、窑洞朝向、口部构造、窑内空间设计、窑洞进深及窑内表面材料光反射等因素对采光量的制约。其次,完善适用于窑洞的天空照度模型,提出了窑内工作面综合照度公式,计算分析表明室外环境是影响采光的首要因素,采光口高度、透光材料及窑内表面反光材料对采光量的影响较大。最后,提出了窑洞在选址、设计、施工和室内装饰等方面的改善措施。     

办公建筑的照度测量及分析

针对某些建筑后期装修与前期照明设计差异很大的问题,笔者通过对某办公建筑的两个典型房间进行实例照度分析,在对照度值和照明功率密度的对比分析中找出后期装修中存在的问题,并提出相应的对策.以期达到合理进行照度装修设计,节约能源的目的.     

LED光源及灯具能效等级评定方法研究

要提高LED光源及灯具的能效,应根据实际照明环境,对灯具进行最优化的配光设计,在满足照度要求的情况下降低功率密度,达到较好的节能效果。通过对不同配光的LED路灯的照明效果比较、以及LED路灯与高压钠灯的照明效果比较,验证了灯具配光曲线的设计对实现整个照明系统高能效的作用,给出更准确的LED光源及灯具能效等级评定方法。