Luminescence and Preparation of LED Phosphor Ca8Mg （ SiO4）4Cl2 ： Eu^2＋

Calcium magnesium chlorosilicate doped by europium, Ca8Mg（SiO4）4Cl2： Eu^2＋, was prepared by the solid state reaction at high temperature. The compound obtained is pure Ca8Mg（SiO4）4Cl2 phase with cubic structure. Its average particle size is 5 μm, and it has good dispersity and morphological form. The excitation spectrum of Ca8Mg（SiO4）4Cl2： Eu^2＋ is a wide band, which covers from 270 to 480 nm. The emission spectrum is also a wide band peaked at 510 nm. The luminescent intensity reaches to the maximum when the concentration of Eu^2 ＋ is 2%. The wavelength of emission and excitation of the phosphor with various Eu^2 ＋ contents keeps constant. This spectrum range matches violet and blue LED chips very well, and its strong luminescence intensity is suitable for a green phosphor of tricolor phosphor of white light LED.     

AVR单片机在真彩显示屏中的应用

介绍了一种由AVR单片机构成的三基色LED引导显示屏，并详细阐述了该显示屏硬件及软件的设计方法。     

分频技术在储层预测中的应用

牛9井区在地质上是一个长期困扰研究人员的地方,虽经过了多次常规地震资料处理,其储层分布问题一直未能得到很好地解决。我们运用分频反演、小波分频成像、时频三原色地震综合处理解释新技术,得到了比较清晰、合理的储层解释结果。     

红色荧光材料的研究现状

从激活剂种类入手,按不同基质体系概述了红色荧光材料的研究现状,介绍了不同激活剂离子在不同基质中的发光性能,以及不同基质的荧光粉具有的优缺点,并对红色荧光粉的未来进行了展望。     

基于Lorenz三维混沌序列的彩色图像加密算法

讨论了一种基于Lorenz混沌动力系统的三维彩色图像加密的算法。该算法首先对Lorenz系统输出的实值混沌序列进行预处理,然后根据序列随机修改图像中每一个像素点的RGB值,并对修改后的图像进行像素置乱。仿真与讨论结果表明,该算法密钥空间大,混沌信号的产生极其敏感地依赖于密钥,具有较好的加密效果和加密效率,并对统计分析具有较好的安全性。     

氢过氧化物裂解酶的筛选及纯化

研究了不同植物原料中氢过氧化物裂解酶的含量,并最后筛选出苋菜作为提取原料。利用高速离心、表面活性剂溶解、硫酸铵分级沉淀、羟基磷灰石柱层析和离子交换色谱对苋菜氢过氧化物裂解酶进行纯化至电泳纯。结果表明,纯化的苋菜氢过氧化物裂解酶分子量约为55ku,对于13-亚麻酸氢过氧化物的活力高于13-亚油酸氢过氧化物,最适pH6.0,最适温度为25℃,在常温下酶能保持较高水平的活力。     

节能灯制造过程中色容差的控制

色容差是节能灯颜色性能方面的一个重要指标。分析了节能灯制造过程中三基色荧光粉的配比及涂粉工艺对色容差的影响,提出了能较好地控制色容差和色参数一致性的配粉及涂粉方案。     

可用于数码相机的新型滤色器实验研究

目前的数码相机获取彩色大多是由棋盘格状Ｂａｙｅｒ型滤色器与ＣＣＤ构成彩色成像器件获得。本文则提出了一种新型格式的滤色器,其不仅具有三原色空间周期采样的特点,同时又具有三色光栅编码的特点,即编码数字图像的频谱面上红、绿和蓝信号相互分离。本文的分析表明这种滤色器和Ｂａｙｅｒ型相比具有解码步骤较为简单的优点。本文特殊设计的模拟实验验证了其用于数码摄影的实际效果。     

Research on color optimization of tricolor product considering color harmony and users' emotion

There are few studies on the tricolor design optimization, and the influence of color-area ratio on users' emotion has been ignored. This article aims to achieve multiobjective optimization of tricolor product color design. Two modes of color-area ratio are put forward. Using the proposed method of generating tricolor schemes, 368 tricolor schemes of the representative baby carriage are designed. Through questionnaire survey, color images are screened, and combined with correlation analysis and factor analysis, five perceptual features of color design are determined as “Order,” “Excitement,” “Temperature,” “Color harmony,” and “Users' emotional preference.” From two perspectives of color information processing, radial basis function neural networks are used to construct two emotional evaluation models. By integrating the radial basis function neural networks and a genetic algorithm, this study achieves multiobjective optimization of tricolor product color design for two optimization objectives of color harmony and users' emotional preference. Verification results show that the optimization schemes are significantly better than other schemes. Due to similar product characteristics, children's electric car is utilized to verify the generalization capability of the optimization method proposed in this article. It has been demonstrated that the optimization schemes achieve higher scores than randomly selected color schemes and the actual subjective scores match with the predicted scores computed by the color optimization method.