共查询到13条相似文献，搜索用时 15 毫秒
1.
《文物保护研究》2013,58(4):149-154
AbstractThe small areas of white metallic pigment seen on the south wall of J. M. Whistler's ‘Peacock Room’ in the Freer Gallery of Art are platinum; this has been used, with a yellow-brown ground, to overpaint a preceding layer of silver which, in one place only, is over a preceding layer of gold. The yellow metallic pigment is confirmed as gold and the blue colour of the south wall and elsewhere is based on Prussian blue. On a separate wood panel a green was tentatively identified as copper resinate, and iron-oxide-based pigments appear to be present. In all areas investigated a white, used as a ground and in admixture, was essentially lead white and calcium carbonate. The significance of these results is discussed briefly. 相似文献
2.
《Journal of Informetrics》2023,17(3):101432
The disruption (D) index is a network-based indicator to quantify the extent to which a focal paper disrupts its predecessors. This study focuses on what disruption means by examining example articles related to “sleeping beauties in science” and frequency-inverse document frequency (TF-IDF). We investigated the structure of the citation network and subsequent papers’ motivations for citing the focal papers. Based on the observation that conceptual work is more likely to disrupt science than technical work, we hypothesize that disruption reflects the mechanism of how paradigms shift in the development of science. We also assume that the disruption identified by the D index indicates more than generating a new direction. Disruptive contributions include revolutionary studies such as Nobel-prize-winning papers, as suggested in previous work. However, disruptive contributions also include scientific dissemination of new terminology created by popular proposals, such as “sleeping beauties in science.” Such contributions redefine and popularize phenomena in science. 相似文献
3.
4.
Abstract Organized transnational political and technological activism ‐ here referred to as transnational advocacy networks ‐ has an increasingly strong role in giving images of how one should behave and what to consume. This article analyses transnational advocacy networks that oppose digital rights management (DRM) systems and related regulations. We suggest the potential impact of this activity to the consumption of content products. We start with defining and describing the most relevant advocacy networks. We provide the characterization of existing organizations and their work both the United States and Europe. Then, we discuss four case studies where media companies have experimented with different strategies against DRM circumvention initiated and endorsed by transnational advocacy networks Our argument is that because of the economics of copying on the Internet it is not a sound strategy to use legal actions to remove any circumventing information from the internet. Any circumvention information published on the Internet will be mirrored out of the reach of legal enforcement mechanisms. So far, the only working strategy seems to be to implement a DRM‐system, which can be updated without user intervention after the security is breached. This might be also the most efficient way to control the impact of transnational advocacy networks opposing DRM systems. 相似文献
5.
6.
7.
《Journal of Government Information》1999,26(5):501-508
Although centralized distribution of U.S. government technical reports began in 1946, the reports distributed by predecessors of the National Technical Information Service (NTIS) for the first 15 years are now effectively “lost.” They are not available from NTIS, and they are not listed in the NTIS bibliographic database. Those reports are available from the Photoduplication Service of the Library of Congress, and many are available from other sources as well. This article describes bibliographic tools and resources available to identify those reports and provides advice on how to obtain them at a reasonable price. 相似文献
8.
9.
10.
11.
12.