采用时域有限差分方法(FDTD),分别对Au纳米粒子在不同间距及不同尺寸下的消光光谱、吸收光谱和散射光谱进行仿真分析,在此基础上研究了Au纳米粒子的尺寸、间距变化对局域表面等离子体共振现象的影响.研究结果表明,随着纳米金球间距的减小,消光因子、吸收因子和散射因子峰值强度明显增大,且当L=R时峰值变化最剧烈;随着纳米金球半径的增大,其消光和吸收峰值波长出现蓝移现象,而散射因子发生了红移现象,但峰值强度均明显增大.

分析了我国印刷发展现状、传统印刷存在的主要污染，并提出了实施绿色印刷应采取的对策，对于节能减排具有重要意义。

In present market, there is no automatic detected device for register in medium and small single-sheet offset, and the registration precision usually adjusted by handwork that is time-consuming and imprecision. To solve this problem, an automatic detected device for register of single-sheet offset based on image processing is proposed. The device takes photos of registration markers through high precision CMOS camera controlled by single chip computer, and then detects transversal deviation, longitudinal deviation, and diagonal deviation of registration markers through Hough transform. Experiments indicate that transversal deviation precision and longitudinal deviation precision of this device is 0.01 millimeter, when this automatic detected device is applied.

A fuzzy comprehensive evaluation model of printing quality was established by using the method of fuzzy evaluation and analytical hierarchy process(AHP).The main parameters which influence printing quality were analyzed. The factor set to constitute fuzzy comprehensive evaluation was confirmed. The structure of analytical hierarchy was established by analyzing different plans, which influences printing quality evaluation. Comparison judgment matrixes were constructed by pairwise comparison of each factor using Saaty 1-9 scales. The weights of every factor were determined by calculating the feature vectors of comparison judgment matrixes and the consistency test. Finally the printing quality hierarchy was evaluated by using fuzzy comprehensive evaluation and according to maximum membership principle. The result indicated that the model objectively determined the weights of parameters which influence printing quality, subjectively evaluated the printing quality hierarchy, and realized the unification of subjective evaluation and objective evaluation.

The CTP workflow not only simplifies the printing technique but also lowers the cost of printing.At the same time,It also avoids the dot loss caused in the process of image information transfer and enhances the quality of products and productivity efficiency.To establish scientifically and reasonably the principal parameters of the plate-making technique in CTP workflow and provide guarantee for high-quality plate-making as well as printing and afford reference for CTP technique flow parameters research,in this paper factors that can affect the plate-making quality were analyzed; orthogonal experiment including four factors and two levels were designed;the dot-gain rates of 50%dots of experimental plates were measured;the method of difference was used to analyze the primary and secondary relationship of factors that can affect the plate-making quality.The established parameters in this paper for laser power,developing temperature, developing speed and brush speed in plate-making workflow are 13W,25℃,65cm/s and 90rpm,respectively.