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1.
本文介绍了彩色沥青混凝土路面的定义、特点,阐述了彩色沥青混凝土路面对原材料的基本要求及施工技术,提出了彩色沥青混凝土路面在我国的应用及发展前景。 相似文献
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吉雅图 《内蒙古科技与经济》2001,(4):109-110,134
彩色滤色镜片是彩色放大机的必备用具，它对彩色照片色彩的准确还原起着非常重要的作用，几乎每一张照片的制作都需要彩色滤色片来进行校色。本文从彩色感光材料的成色原理入手阐述分析了照片上出现偏色的各种可能因素和校色的必要性，并提出了运用彩色滤色镜片组进行校色的方法，总结归纳出校色时鉴别偏色应注意的问题和校色的规律。 相似文献
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本文提出了一种将彩色数字水印嵌入到彩色载体图像的新算法,利用改进的Patchwork方法将一级小波分解的水印图像的低频部分分别四次嵌入到经过离散余弦变换和离散小波变换后的载体图像的RGB分量中,提取的时候,将四次嵌入的低频分量取出并求平均值,用来作为水印的最终低频分量。经过实验验证,该算法对很多攻击具有很好的鲁棒性。 相似文献
4.
彩色印前是彩色印刷之前各种工艺的总称，现已成为多媒体技术的重要应邀领域。本文主要阐述彩色印前电脑设计制作系统的组成原理和其中的三项主要技术。 相似文献
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结合北京市首条彩色路面试验路——圆明园东路彩色沥青混凝土类公交车道工程,介绍了彩色沥青混凝土路面的性能特点,研讨了彩色沥青混凝土路面混合料的技术指标,原材料的选择、组成、要求及热拌彩色沥青混凝土混合料的搅拌和运输特殊规定,详细论述了的生产、摊铺与碾压成型等各个施工程序的要求和注意事项,指出了施工中发现的问题,并提出改进措施。 相似文献
7.
基于不平度的快速图像彩色化方法 总被引：1，自引：0，他引：1
黑白图像的彩色化是图像处理领域一个活跃的、有挑战性的研究课题．在总结了其他 图像彩色化方法的基础上,提出了一种新型的快速彩色化方法．该方法以不平度作为颜色扩展 的约束条件,使用热传导方程来代替颜色混合方法使色块边缘更加平滑,从而大大降低了运算复杂度、提高了彩色化效率．实验表明,该方法不仅速度快,而且能够大大简化对初始着色的要求,并达到很好的彩色化效果． 相似文献
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通过总结比较近几年公司负责的几项彩色沥青砼自行车道路面的施工,主要在施工工艺上提出对彩色沥青砼路面的施工与普通沥青砼路面的不同之处,总结彩色沥青砼方面的施工经验。 相似文献
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彩色插图能向读者提供更全面、准确的信息，是科学工作者研究成果的完整体现，也是研究者电脑绘图技术水平的反映。科技期刊对彩色插图的要求是：彩色插图的图例要全，图斑色彩与实际色彩和地图习惯用法尽量一致，图斑色彩的深浅、鲜淡要与图斑大小和反映内容相配，图形文件最好用WMF、CRD、DGN等矢量图文件。为了获得最好的投入效果比，各种刊物在编排彩色插图时，可采用三种不同形式的排版方法。 相似文献
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明胶是制备感光材料用量最大，性能最复杂的一种原料，在感光材料中发挥着重要作用。国外彩色感光材料主要以新鲜牛骨为原料，我们针对青海的牦牛资源，以牦牛骨为原料，采用独特的工艺处理方法及控制技术研制了理化指标，杂质含量和感光性能均达到国标的彩色照相明胶。 相似文献
11.
《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
14.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
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Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
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Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
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Prof. SUN Changpu from the CAS Institute of Theoretical Physics coworkers from University of Basel in Switzerland have worked out a way - at least in theory - to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams is similar to the famous Stern-Gerlach effect whereby a beam of atoms passing through a magnetic field is split in two according to the atoms' spin states 《中国科学院院刊(英文版)》2008,22(1):23-23
Prof. SUN Changpu from the CAS Institute of Theoretical Physics and coworkers from University of Basel in Switzerland have worked out a way --at least in theory --to split a beam of molecules according to their chirality. The technique involves passing the molecules through three different laser beams and is similar to the famous Stern-Gerlach effect, whereby a beam of atoms passing through a magnetic field is split in two according to the atoms＇ spin states （Phys. Rev. Lett. 99 130403）. 相似文献