共查询到19条相似文献，搜索用时 171 毫秒
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连续喷墨不同于按需喷墨之处在于墨水射流分裂为墨滴后连续地喷射,为此需控制墨滴的飞行方向,以通过连续喷墨设备获得预期的印刷效果。
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作为一种经济、有效的彩色打印输出设备,喷墨打印机已经被众多的用户所熟悉。尤其是随着数码影像技术的发展,自己制作数码照片的观念已渐渐被广大家庭用户所接受,以打印彩色见长的喷墨打印机更有了施展本领的新天地。 是什么原因使得喷墨打印机可以输出精美亮丽的照片与图片呢?不同机型间打印品质的差别是怎么造成的呢?探讨这些问题,有必要从喷墨打印机的核心——喷嘴的技术讲起,从每个墨滴的形成过程谈起。 相似文献
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Barry Happ&#; 《桌面出版与设计》2008,(2):6-7
与任何新兴技术一样,数码印刷虽然出现得较晚,但正在备方面取得持续,迅猛的发展,特别是在速度,输出幅面和可靠性方面有了很大提高。
喷墨技术的发展体现在速度上．可与计算机的处理速度和数码相机的突飞猛进相媲美。喷墨印刷设备将随着速度的改变而快速地发展。主要打印头供应商正在提高制造精度以及产量,并且降低销售价格。同时,正在关注可变喷墨头、更小墨滴的喷墨能力,以及喷墨速度的改善。 相似文献
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热喷墨、压电喷墨和相变喷墨印刷以不同的方式发生并喷射墨滴,在打印头的驱动方法上必然存在各自的特点。为了更好地应用喷墨设备,应该对目前商业市场上的三种主要按需喷墨技术的驱动脉冲差异有相当程度的了解。 相似文献
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印刷电路板（Printed Circuit Board,简称PCB）是当今发展迅速的一个高新产业．而喷墨印刷技术的快速发展又为这个产业注入了新的活力．给电子工业带来了重大变革。喷墨印刷是不需要接触、没有压力．不需印版的印刷技术．只需将电子计算机中存储的信息输入喷墨印刷机即可印刷。它还具有无版数码印刷的共同特征．可实现可变数据印刷。与传统方法相比,喷墨技术将会给PCB业带来更快的速度和更低的成本,最重要的是可以达到更高的布线密度。 相似文献
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《Journal of Informetrics》2014,8(2):329-339
One problem confronting the use of citation-based metrics in science studies and research evaluations is the Matthew effect. This paper reviews the role of citations in science and decomposes the Matthew effect in citations into three components: networking, prestige, and appropriateness. The networking and prestige effects challenge the validity of citation-based metrics, but the appropriateness effect does not. Using panel data of 1279 solo-authored papers’ citation histories and fixed effects models, we test these three effects controlling for unobserved paper characteristics. We find no evidence of retroactive networking effect and only weak evidence of prestige effect (very small and not always significant), which provides some support for the use of citation-based metrics in science studies and evaluation practices. In addition, adding the appropriateness effect reduces the size of the prestige effect considerably, suggesting that previous studies controlling for paper quality but not appropriateness may have overestimated the prestige effect. 相似文献
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Recent work in the area of communication and individual differences has produced measures of two traits which promise to be important to the process of selecting compliance gaining messages. In the study reported in this paper the effects of these two traits, argumentativeness and verbal aggressiveness, on compliance gaining message chokes were assessed, while controlling for the effects of two known predictors, negativism and dogmatism. The data indicate that the impact of these variables is situationally dependent. This finding is discussed in terms of recent hypotheses concerning the impact of trait by individual difference interactions on human communication behavior. 相似文献
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This study is part of a larger research project at the Image Permanence Institute dedicated to digital print preservation issues – the Digital Print Preservation Portal (DP3). Previous DP3 studies determined that certain digital print types are prone to cracking and/or abrasion, and that factors such as low relative humidity, pollutants, and light increase the brittleness of the ink-receiving layer of some inkjet papers. The purpose of this investigation was to explore if light also increases the propensity of inkjet prints to abrade, and to examine the potential of framing glazings to mitigate light-induced physical damage (cracking and abrasion) by attenuating some portion of the UV spectrum. Inkjet papers and prints were subjected to xenon lighting (to simulate daylight through window glass) without glazing, or in sealed framing packages with plain framing glass (soda-lime) or UV filtering glass. Before and after light exposure, brittleness, and abrasion resistance were evaluated independently using two tests: ISO 18907 (Imaging materials – Photographic films and papers – Wedge test for brittleness) and a rub test utilizing a Sutherland® Rub Tester. In this study, exposure to light increased the cracking and/or abrasion tendency of some specimens. The use of UV filtering glass reduced this light-induced propensity in all cases. Plain glass protected all samples from at least one of these two types of surface damage, but was less effective than UV glass. Light-induced brittleness and sensitivity to abrasion were mostly, though not exclusively, caused by UV radiation. It was also seen that some prints may become brittle and/or prone to abrasion in the absence of image fade. Budgeting the amount of light these objects can be exposed to, protecting them from UV radiation, and handling prints with caution especially after exhibition, is essential in order to limit physical damage. 相似文献
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《文物保护研究》2013,58(4):267-280
AbstractThis project examines the lightfastness of prints created with the most commonly used digital technologies (inkjet, color electrophotography, dye sublimation and digital press) along with prints created using traditional technologies (color photography, black-and-white electrophotography and offset lithography). The inclusion of traditional prints provides benchmarks for collection care professionals to better gauge the significance of the results. In this study, prints were subjected to two types of lighting used independently to simulate daylight through window glass and artificial indoor illumination. Five aspects of light damage were assessed: fade in the mid-tone neutral, fade in the darkest neutral tone, paper yellowing, changes in paper gloss and text readability. In general, digital prints were less sensitive to light than traditional prints; but each digital printing technology produced at least one sample that performed worse than its traditional benchmark in at least one of the aspects of light damage studied. Therefore, it is recommended that cultural heritage institutions strive to provide the most benign environment possible, taking display practices currently in use for traditional prints as a minimum starting point for the care of digital prints. Close monitoring for signs of change is also recommended. 相似文献
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认为学术论文评价方法在引导基础研究人员行为和科研产出方面具有重要作用,故有必要制定成本合理、科学公正的评价体系。以文献[3]提出的论文推荐-传播模型为基准,通过控制评价信息中大同行和小同行的比例、评价对象的选择方法以及给推荐者赋权3个策略来优化推荐-传播模型的学术评价功能。运用仿真方法验证优化策略的有效性后,提出利用平台用户的推荐-传播行为,自动计算学术论文影响指数、质量指数和价值指数的方法,从而构建一种新的学术论文评价方法。 相似文献
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论图书采购中成本的控制 总被引：3，自引：0，他引：3
针对目前高校图书馆纸质文献采购不断加大的趋势,提出图书采购过程要进行成本控制,即对图书采购数量的控制和图书单位成本的控制,并对企业内部控制理论引入图书采购进行了探索。 相似文献
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Craig W. Trumbo 《Mass Communication and Society》2013,16(5):718-738
The effect that newspapers had on patients visiting physicians for influenza was examined for 2002 to 2008. The basis for this investigation rests on theories of media effects drawn from agenda setting, media hype, and the Social Amplification of Risk Framework. It was hypothesized that controlling for the rate of influenza, a positive relationship exists in which increases and decreases of newspaper attention to influenza precede increases and decreases in the percentage of patients visiting physicians for flu symptoms. The percentage of visits and the percentage of positive flu tests are taken from the Centers for Disease Control's flu report. Media attention was located through the Lexis/Nexis database as words per week in stories having flu in the headline in 32 newspapers. Time series analysis shows that controlling for autoregressive and seasonal effects, and the actual rate of disease present, news attention in the previous week accounts for a statistically significant portion of the increase and decrease in the number of individuals who go to their physician reporting influenza-like symptoms. Reverse causality was examined. It was shown that controlling for autoregressive and seasonal effects, patient visits did not predict news coverage, whereas the rate of the flu in the previous 3 weeks did. 相似文献
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对UGC机制下档案用户虚拟在线社区构建意义的阐述,解释社区构建的合理性,并通过对不同档案虚拟社区实例的调查,发现每个社区类型的最优功能,并提出最佳的UGC构建途径,具体包括融入TAG、简化注册、把控话题、优化问答生成、跨屏跟进等机制的运用。同时还要注重社区必要的监控与调度,在互联网伦理道德允许范围内,行使个人权利。 相似文献