3‐D Printing and Development of Fluoropolymer Based Reactive Inks

Engineering reactive materials is an ever present goal in the energetics community. The desire is to have energetics configured in such a manner that performance is tailored and energy delivery can be targeted. Additive manufacturing (3‐D printing) is one area that could significantly improve our capabilities in this area, if adequate formulations are developed. In this paper, fluoropolymer based reactive inks are developed with micron (mAl) and nanoscale aluminum (nAl) serving, as the fuel at high solids loading (up to 67 wt%) and their viscosity required for 3‐D printing is detailed. For the pen‐type technique and valves used in this work, it is required to have viscosities on the order of 10⁴–10⁵ cP. For printed traces with apparent diameters under <500 μm, the combustion velocities for both micron and nano scale aluminum formulations, are approximately identical: 30 ± 3 versus 32 ± 2 mm s^?1, respectively. Further increasing the apparent diameter is shown to increase the combustion velocity in the case of the nanoscale aluminum formulation by four‐fold over that of the micron scale aluminum formulation, but it plateaus as it approaches an apparent diameter of 2 mm. The results suggest with proper architecture that tailorable combustion rates and energy delivery are feasible.

     

食品接触材料中有害物质迁移的研究进展

目的 综述目前食品接触材料中几种常用材料(纸、塑料、油墨)迁移与检测的研究进展,并指出几种材料未来的发展趋势,促使我国食品行业向着更绿色、更安全的方向发展。方法 概述纸质、塑料、油墨的发展趋势和材料中有害物质的来源;对比几种材料的迁移规律及迁移模型;总结几类常见有害物质的检测方法。结论 绿色环保的生物基材料是食品接触材料未来的发展方向,同时也需重视可持续性生物基食品接触材料的化学安全性。因其产生的化学品对人体健康的影响不甚明朗,因此需多方面研究生物基食品接触材料中化学物质的存在和迁移到食品中的情况,并采取相应措施减少包装材料的使用,降低材料中有毒有害物质对人体和环境的威胁。     

基于粒子群算法的彩报印刷墨量计算方法研究

着墨量的精确计算和自动控制是提高彩色报纸图像质量的主要因素;针对目前彩报印刷计算不准确及自动化程度低等不足,主要对基于粒子群算法的彩报印刷CMYK四色油墨墨量计算方法进行研究;在分析基本粒子群算法原理的基础上,通过引入自适应惯性权重和收缩因子,改善了算法的收敛性能,应用改进粒子群算法对求解本问题进行研究,验证了算法的有效性,该墨量预置方法能较精确地控制墨层厚度,为彩报印刷自动配色提供了可参考的方法.     

Analyzing the efficacy of using digital ink devices in a learning environment

There has been increased interest on the impact of mobile devices such as PDAs and Tablet PCs in introducing new pedagogical approaches and active learning experiences. We propose an intelligent system that efficiently addresses the inherent subjectivity in student perception of note taking and information retrieval. We employ the idea of cross indexing the digital ink notes with matching electronic documents in the repository. Latent Semantic Indexing is used to perform document and page level indexing. Thus for each retrieved document, the user can go over to the relevant pages that match the query. Techniques to handle problems such as polysemy (multiple meanings of a word) in large databases, document folding and no match for query are discussed. We tested our system for its performance, usability and effectiveness in the learning process. The results from the exploratory studies reveal that the proposed system provides a highly enhanced student learning experience, thereby facilitating high test scores.

东方神韵的生命符号——中国元素在动画角色中的点睛之笔

最动人、最传神、最有生命力的艺术就是具有民族独特性的艺术。中国元素不管从符号上还是精神上都深刻反映和传承中国深邃、厚重的文化底蕴和中国聪慧、朴实、善良、锲而不舍的民族精神。中国传统文化中的戏剧脸谱、门神年画、水墨绘画、敦煌壁画等博大而精深的中国元素,因为其民族性、独特性、地域性等鲜明特征,而在动画角色设计中展现了独特魅力,传承和发扬了中华民族深厚的文化精粹和博大的人文情怀,构建了动画角色真正的灵魂。     

基于BP神经网络的计算机油墨配色系统的研究

计算机配色可提高油墨配色的速度和精度,具有重要作用．基于两种颜色空间和BP神经网络的计算机配色系统被研究．实验结果表明基于光谱颜色空间配色系统的配色精度更高,可应用于目前的各种印刷方式中．基于BP神经网络的配色系统具有很强的适用性,推进了印刷的数字化流程．     

戏画人生——关良的水墨戏剧人物画研究

关良是中国近现代画坛上一位不可或缺的大师,也是最早将西方绘画艺术介绍到我国的先行者之一。从关良留下的作品看,他酷爱传统戏剧,对戏剧表现语言深有体味。他不仅将西方现代派的绘画理念引入中国传统的水墨画之中,也在油画中表现了许多传统中国画的元素,在他的灵魂里,东西方艺术已经融为一体。重新审视其独特艺术语言,希望能为当代画坛提供一些启示。     

Synthesis of Cu nano-particle in toluene used for conductive ink with a binder of polyurethane

Copper nanoparticles with a size of about 150 nm were prepared in toluene using oleic acid as protecting agent. The nanoparticles were used to prepare conductive Cu ink with a polyurethane binder. Oleic acid was used to prevent the nanoparticles from oxidization and agglomeration. The prepared Cu nanoparticles were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The resistivity of the copper film on glass substrate that was prepared using Cu nanoparticle ink reached about 1.5× 10-4 2. cm-1 after it was annealed to 120 ~C. Both the nanoparticle ink and the films were characterized by XRD, fourier transform infrared （FT-IR）, and the thermogravimetry-differential scanning calorimetry instrument （TG- DSC）.     

墨层厚度对基于蒙版方程配墨精度的影响分析

基于蒙版方程油墨配墨模型,是一种新型的配墨方法.影响配墨精度的因素很多.选取墨层厚度这一重要影响因素作为研究对象,确定基于蒙版方程模型的目标色配墨比例,通过IGT适性仪印刷出墨层厚度不同的样品色样,对样品色样与目标色进行分析对比,分析墨层厚度对配墨精度的影响,寻找最佳墨层厚度.得出的结果对实际生产有一定的指导意义.