Analysis of color volume of multi‐chromatic displays using gamut rings

There are claims that multi‐chromatic displays can achieve a wider color gamut by the use of additional highly saturated secondary color channels. However, there are other claims that these displays lose lightness and/or color saturation at brighter levels. These apparently divergent views have led to some controversy in the display industry and at standard setting organizations. This study examines the color gamut volume for a variety of simulated and measured multi‐chromatic (sometimes incorrectly referred to as “multi‐primary”) displays using combinations of white and/or secondary color channels, such as cyan, magenta, and yellow. Furthermore, a two‐dimensional gamut representation, referred to as “gamut rings,” is introduced to illustrate that the addition of nonprimary optical color channels to a trichromatic (RGB) display can result in a significant decrease in the chroma at higher lightness levels. The additional saturated color channels can increase the gamut volume only around their hues at darker levels. The results also confirm the validity of comparing the color light output and white light output for revealing the design trade‐offs between the high‐peak white and the color‐image brightness for multi‐chromatic displays.     

广绣定制服装的CLO 3D虚拟服装设计

借助CLO 3D虚拟服装设计软件,将虚拟现实技术与非物质文化遗产广绣有机结合,设计了两款广绣定制服装作品。实现了广绣定制服装的虚拟服装设计、虚拟缝制、虚拟图案设计、虚拟展示等过程,表明虚拟服装设计应用于广绣定制服装可行。为广绣的传承与发展提供了新方向,同时也为服装定制类型企业推进数字化进程提供了参考。     

织物结构参数对热传递性能影响的模拟分析

为方便快捷构建出接近三原组织织物真实结构的三维几何模型,应用图像处理技术对织物截面提取特征点,基于Newton插值公式拟合纱线中心线方程进而建立织物模型,而后在有限元软件中设置材料取向、定义边界条件,对三原组织织物的热传递性能进行数值模拟,通过实验验证了有限元方法及模型的有效性。之后预测了织物紧度对织物热传递性能的影响。结果表明:在相同织物紧度的条件下,平纹织物的热传递性能最好,其次是斜纹织物,最后是缎纹织物;在一定范围内,随着织物紧度的增加,织物的导热性能逐渐增加。     

唐昭陵壁画女装的3D虚拟试衣结构复原北大核心CSCD

唐昭陵保存了初唐时期大量壁画资料,但服装出土实物少,给服装结构的研究带来一定的难度。本文通过对唐昭陵壁画中的女装款式、比例的统计分析,以出现率最高的半臂套装和襦裙套装为研究对象,利用比例换算、CLO3D虚拟试衣实验法测量推算出服装尺寸,并进行试穿实验,复原出服饰结构。通过服装比例比较、可穿性、变形率及压力等评价分析,进一步验证了虚拟复原的可行性。研究得出,壁画中主流款式的服装结构构成形式、服装与身高的比例关系、穿着方法对形态的影响等相关结论,为初唐女装结构与形象研究提供思路与参考。     

基于三维服装建模技术的古代服装数字化虚拟复原

为更好地实现残缺古代服装文物的非接触式修复,提出一种基于三维服装建模技术进行古代服装数字化虚拟复原的方法。以正仓院所藏唐代"黄地夹缬絁袍(残欠)"为研究对象,首先在MatLab中使用Canny图形检测算法对袍服的污损纹样进行提取和修复;其次使用服装CAD软件ET SYSTEM对袍服残缺部分的款式和结构进行平面复原;最后使用基于CLO3D平台的服装三维建模技术对该袍服进行了数字化三维虚拟复原,并对复原方案执行了动态仿真模拟。结果表明,该方法可完成古代服装文物的高精度三维虚拟复原,有效还原出古代服装的三维动态形貌,为实际修复工作提供数据参考。     

Novel Impact of Wet Dosages of NMP in Extraction for Production of High BMCI Carbon Black Feedstocks

Abstract

In separation sciences, “Solvent Extraction” is one of the most important unit operations, a very widely used process, next only to distillation. In the petroleum refining industry, solvent extraction is commonly widely applied to produce a number of specialty products such as BTX, lube base oils, waxes, etc. There are many solvents used in various separation processes, like sulfolane, phenol, furfural, ketones, and N-methyl pyrollidone (NMP). NMP in particular is an environmentally benign, new generation solvent, which can be tailored for specific separations by using it in conjunction with small doses of water. In recent years, researchers are re-looking at the separation processes and their modifications to exploit these for producing high-value industrial products from low-value refinery streams. The present study deals with the production of high-quality carbon black feedstocks (CBFS) from clarified oils. The study shows the beneficial effect of using NMP in combination with different dosages of water as extraction solvent to extract low-value clarified oil, a cracked material from the FCC unit of an operating Indian refinery. In the present study, water ranging from 0.3 wt% to 10 wt% was used with NMP to produce aromatic extract of BMCI (Bureau of Mines Correlation Index) up to 146 through liquid-liquid equilibrium and mass transfer studies on clarified oil (CLO). The effect of solvent-to-feed ratio at constant temperature on solvent extraction was also studied. The addition of water in NMP alters the “selectivity” of solvent, which can be exploited for producing aromatic extracts of a wide range of BMCI for different end-use applications. The major users of such high BMCI extracts are carbon black and electrode pitch manufacturers. Regression analysis was also done to develop correlations between water percentage in NMP and targeted BMCI of aromatic extract. Presently, CLO is blended with fuel oil and sold as a very low value product in refinery. Since the demand of CBFS is increasing continuously and current short-fall in India is met through imports from China, Korea, and Japan, it is desirable that such studies are undertaken and will lead to production of high-value CBFS from low-value refinery streams through separation processes.     

基于CLO3D技术的宋代女装影视化虚拟设计研究

影视服装不仅要满足人物的服用需要,更具有鲜明的历史象征意义。针对宋代影视剧服装设计中存在的不尊重历史等现状,以《大宋少年志》女主角赵简的服装为例,结合宋代女装款式、纹样、色彩和面料特色,将款式和纹样进行矢量化设计,并利用CLO3D技术再设计了一套完整的在宋代影视剧中合理穿戴的服装,从而探究CLO3D技术在影视剧服装设计中的可行性及优劣性。     

浮点运算中前导0/1计算的设计方法

总结浮点运算中前导0/1问题的解决办法,阐述各种方法的原理和实现方法,用VHDL硬件描述语言描述,并进行仿真和综合。在实际中采用一种便于实现的高性能前导0/1的设计方法,兼顾速度和面积2方面因素。此方法已作为一个模块,应用到某32位浮点复数运算的IP核设计中,收到良好效果。     

连铸板坯切割长度优化系统的研究

利用切割长度优化计算机系统可以在板坯连铸生产过程中使废坯量和非订货板坯产品减到最少,从而提高板坯的收得率。主要介绍了切割长度优化系统的工作原理、系统软件构成模块以及各模块的功能;并且阐述了该系统在炼钢生产中的实际应用效果。     

Fractal approach to structure and thermal property of down fiber assembly

Down fiber assembly is a heterogeneous and hierarchical system whose structure can be hardly characterized. At the meantime, its thermal property is valuable for usage, it would guide design if the correlation between thermal performance and structure can be understood. In this paper, fractal approach was introduced to characterize the microstructure of down fiber assembly. Fractal dimensions of fiber assemblies are calculated by box-counting method and are found to be positively correlated with basic structural parameters such as fiber mass and volume fraction. Meanwhile, the results indicate that increasing fractal dimension will lead to an enhancement of thermal insulation performance.