共查询到20条相似文献，搜索用时 406 毫秒
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程由发 《福建广播电视大学学报》1995,(2)
本文介绍数字化仪表误差的产生,测量精度和分辨率,介绍提高数字化仪表分辨率的技术,以及如何选择最恰当精度和分辨率的仪表满足使用要求。 一、量化误差 数学化仪表是将被测模拟量数值用有限位数的二进制数码表示的。模似信号转换成数字信号一般都经过采样——保持和量化编码的两个过程。如图(一)所示。 相似文献
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富士施乐Phaser 系列真正具有1200dpi打印分辨率的彩色激光打印机在Windows NT/95/98/2000环境下安装后,在打印机属性对话框中,可以看到图形菜单下“分辨率” 一项,永远只是“600dpi”,而不是用户期望的“1200dpi”,对此 很多用户感到困惑,本文将以Fuji Xerox Phaser 780彩色激光打印机为例向用户做详细说明。 相似文献
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《电子出版》2003,(1):42-42
扫描图片时,如何选择合适的分辨率,这是一个既重要又使人困惑的问题。因为它不仅与原稿和输出要求有关,而且直接影响到输出效果。扫描分辨率设低了,输出的图片精度不理想;设高了不但无法显示效果,而且浪费扫描和处理时间,并且产生的文件过大,无谓地占用磁盘存储空间。 那么,在扫描图片时,究竟该如何选择合适的分辨率呢?这要根据原图尺寸、最终输出方式以及输出幅面综合考虑来确定。在屏幕上显示 如果只在屏幕上显示图像(例如电子相册、网页图像),由于扫描分辨率会直接转换成显示分辨率,它们是等同的。而屏幕只能显示大约72dpi(dpi是Dot Per Inch的缩写,即每平方英寸所包含的点数)的图像品质,所以用72dpi的分辨率扫描就可以原大显示。使用更高的分辨率,只会增加图像文件数据量和显示面积,并不能提高图像在屏幕上显示的清晰度。 相似文献
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照片档案数字化扫描分辨率的选择与确定 总被引：4，自引：0，他引：4
照片档案数字化扫描的分辨率是光学分辨率而不是增强分辨率.确定分辨率时,应遵循“方便利用、保证清晰、符合规定”等原则,在开始扫描前,就要根据照片档案是为了保存资料还是为了打印利用等不同用途,选择合适的扫描分辨率,并在分析照片档案数字化扫描分辨率选择的基础上,对照片档案数字化扫描分辨率的具体确定方法进行研究. 相似文献
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扫描仪的分辨率与测试精度 总被引：1，自引：0，他引：1
《电子出版》1996,(8):Z013-Z020
扫描仪的分辨率与测试精度分辨率的概念常被误解，这样就会在如何对扫描仪进行测试以及对扫描仪进行质量评估方面引起混乱。分辨率是一个扫描仪区别一个对象的细节内容（高频率）的度。光学采样率是分辨率的一部分。还有一些其它因素：．透境质量．滤光器质量．托架的移动... 相似文献
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档案数字化转换和应用过程中 ,总会遇到图像分辨率这个概念 ,特别是在胶片数字化转换和照片数字化转换工作中 ,如何正确理解分辨率一词的含义和不同应用形式对档案数字化工作具有重要意义。分辨率一词被用来表示众多不同设备和不同模式的数字图像的精度 ,因而人们很可能会混淆它的含义 ,在档案数字化加工过程中 ,要采用不同的设备（扫描仪、数码照相机等）和以不同数字图像模式（位图、灰度和多种彩色模式）对不同的档案原件进行数字转换 ,以及对不同的数字图像处理方式和应用目的都要确定各自的分辨率。因此 ,对分辨率的深入理解和正确使用… 相似文献
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扫描分辨率的设置是否合理、科学,直接关系到照片档案的质量和图像大小,影响照片档案的存储和打印。在设置照片档案扫描分辨率时,存在着把扫描分辨率与扫描仪分辨率、打印分辨率、显示器分辨率等混为一谈的误区,以及把扫描最佳分辨率与扫描最高分辨率等同的误区。正确设置扫描分辨率,有助于提高照片档案扫描的质量。 相似文献
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排他性对科技论文编校工作的损害及其解决措施 总被引：6，自引：2，他引：4
从人性的角度出发,讨论科技论文编辑者自身的排他性对科技论文编辑、校对工作的损害及相应的解决措施.认为如果编辑者能够克服自身的排他性,将有助于提高科技期刊的编校质量. 相似文献
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党的执政能力具体所指因时而异。就当前执政环境而言，防止公权力异化的本领、科学制定与执行公共政策的本领、建构和谐政治与社会的本领应该是党的执政能力主要内涵。大众传媒作为重要的执政资源，其对党与政府执政能力提升有着不可替代的功能。 相似文献
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This article reports a survey on the extent to which low power television (LPTV) stations have achieved their intended results of increased local programming, minority ownership, service to narrow audiences, and economic viability. The authors conclude that such stations produce some local programming but rely heavily on programming produced elsewhere, and that they are targeting underserved audiences. Ownerships of LPTV stations by minorities is low, according to the researchers, and economic viability of the stations has not yet been established. 相似文献
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当前,新闻媒体的经营危机已经众所周知.2016年美国总统大选后,新闻媒体真正的存在危机已经变得越来越明显,那就是影响力的丧失.虚假新闻增多、信任度下降和利润急剧下滑都是新闻媒体丧失影响公共舆论和政策能力的表现.不过,影响力就像能量一样只会转移而不会消失.新闻媒体丧失的影响力转向了网络平台.网络平台不仅可以支配美元,而且支配他们服务的全球受众的注意力,不过从现在看,网络平台似乎还不太情愿接管这种影响力转移. 相似文献
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阐述了以科学发展观统领图书馆工作,提升图书馆在文化公共事业中的地位作用,进而提出了新形势下加快基层图书馆工作的转型和升级。 相似文献
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《Communication monographs》2012,79(1):28-48
It has long been recognized in the nonverbal communication literature that individual differences in extraversion are expected to be most clearly evident in expressive forms of nonverbal behavior. Although several studies designed to examine the correlation between extraversion and nonverbal behavior have been conducted, most attempts to summarize these studies reflect the inconsistent nature of the research findings. Indeed, correlations range from ?.36 to .73. The extant literature summaries are limited to narrative reviews, however, which tend to be highly selective. The purpose of this study was to meta‐analyze the relevant studies. Results indicated that the mean correlation coefficient weighted for sample size was .13 for the entire sample of studies. Although 63% of the variance was attributable to sampling error, the distribution of correlations was heterogeneous. The remaining variance was due to two methodological artifacts: sample size and the number of nonverbal behaviors coded. For example, hierarchical breakdowns by moderator indicated that the mean correlation was .50 for highly focused studies—those in which researchers concentrated on a few behaviors and limited coding to 40 or fewer subjects. A cognitive‐overload model for these findings is offered and corroborated by findings from other research domains. Implications for communication research and theory are discussed. In addition to clarifying the empirical relationship between extraversion and nonverbal behavior, the contributions of this study reside, in part, in its implications for large samples and large numbers of nonverbal behaviors coded in research and for meta‐analyses of such research literatures. 相似文献
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Victor Rosenberg 《Archival Science》2011,11(1-2):77-93
Traditionally, an archive of family letters provides primary source materials for historians. The family archive described in this article does provide detailed insight into the suffering of several Jews in Germany and France before and during World War II. It serves as a memorial to several individuals who were murdered by the Nazis. It is also a moving testimony of the cost of war. As such, it can be seen as contributing to the wider historical record of the Holocaust. But in addition, this family archive also opened an entire series of new relationships with previously unknown blood relatives scattered across the globe, with an artist drawing the archive into a creative remembrance project, and also with individuals interested in the history of their community in Germany, which was my father??s birthplace. This family archive demonstrates values of archives parallel to their historical significance. It provides a meaningful illustration for how they can, in an unanticipated and unpredictable fashion, serve as a device for forging contemporary and ongoing familial, interpersonal, and social relationships. Ultimately, this archive of family letters, created in the midst of pain and anguish and death, has laid a new foundation of commemoration and remembrance. 相似文献
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《Journal of Radio & Audio Media》2013,20(1):205-227
This essay investigates the relationship between media and society by applying three evaluative criteria: media ownership and control; professional practices; and social function of the medium. An historical study of Nicaraguan radio from 1930–1990 provides empirical grounds for theoretical claims. In particular, the practice and function of the community radio network Corporación de Radio Difusión del Pueblo (CORADEP) from 1980–1990 suggests that democracy in the public sphere depends on broad public access to and popular participation in media production and distribution. 相似文献
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全球化时代的传播与国家权力 总被引：1，自引：0，他引：1
传播全球化对政治、经济全球化的推进 ,既冲击着国家权力的藩篱又受到国际规制的约束。同时 ,在当今这个国家间合作与对立交织的世界 ,传播全球化依然要受到国家权力的牵制 ,各国必然要利用国家权力 ,在国家战略的框架中制定相应的全球传播战略 ,以获取最大的国家利益 相似文献