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Carmen Cole Angela R. Davis Vanessa Eyer John J. Meier 《The Journal of Academic Librarianship》2018,44(3):419-425
In 2008 Meier and Conkling first tested Google Scholar's coverage of the engineering literature against citations gathered from the Compendex database. Since that time, other studies have used the same methodology and found improvement in Google Scholar's coverage. This study uses engineering dissertations from Proquest Dissertations & Theses to create a data set of citations for the comparison of fee-based databases, Compendex and Scopus, against Google Scholar. From 1950 to 2017 Google Scholar outperformed both Compendex and Scopus in discoverability of citations in nine engineering subjects. These results have implications for collection management and information literacy program planning for librarians. 相似文献
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对Ei Compendex Web选刊原则、对其收录文章文摘的要求予以说明,对EI中国网站收录的中国期刊所划分的核心／非核心与国内期刊核心／非核心进行了比较,列出了2006年EI新增中国期刊及国内部分期刊更名情况信息,说明了Ei数据库对检索项Author（作者）、Author Affiliation（作者单位）的标引特征和检索注意事项,旨在使国内众多的用户详知Ei收录期刊的特点,收录期刊的增、删情况,了解该数据库独特的检索性能,从而更加有效地利用数据库。该文同时对于科研工作者论文的投稿工作具有指导意义。 相似文献
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The relative performance of science and technology (S&T) in the USA and PRC was compared in terms of quantity and quality, as reflected in their technical literatures. Three databases (Science Citation Index (SCI), INSPEC, Ei Compendex) were selected for the quantity comparison, and citation analysis in the SCI was used for the quality comparison. Thirty technology and research areas were compared for quantity production, and are presented in this paper. These 30 areas were selected based on our previous assessment of PRC S&T output, and represented areas of emphasis by the PRC in physical, environmental, engineering, and life sciences.In almost all technical areas, the USA had the quantity (number of papers) lead (for the period 2002–2007) based on the SCI results, although the PRC has made dramatic strides to overtake the USA. In most of the technical areas, by 2007 PRC had attained parity with, or exceeded, the S&T literature production of the USA in the INSPEC database. The major exceptions were the biomedical field and some aspects of environmental science, where the USA still had a large lead. For most technical areas, by 2007 the PRC had even higher relative S&T literature production, based on the Ei Compendex, compared to the INSPEC results. Moreover, the USA production appears to have peaked (in the Ei Compendex) in the 2005 time frame, despite increasing amounts of funding for S&T research. The PRC challenge in non-biomedical research and technology sectors becomes apparent in those databases that do not contain substantial biomedical research papers, and therefore remove a substantial intrinsic USA advantage.For quality computations, the publication and citation results were normalized to discrete slices of time, and are presented for nanotechnology only (for the period 1998–2003). While the USA held a commanding lead in quality over the PRC (and the other major nanotechnology producer nations as well) during the past decade, the PRC has increased the quality of its publications monotonically, and now appears to be competitive with France, Italy, Japan, and Australia, using the quality metric in this paper. 相似文献
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Google Scholar’s coverage of the engineering literature is analyzed by comparing its contents with those of Compendex, the premier engineering database. Records retrieved from Compendex were searched in Google Scholar, and a decade by decade comparison was done from the 1950s through 2007. The results show that the percentage of records appearing in Google Scholar increased over time, approaching a 90 percent matching rate for materials published after 1990. 相似文献
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文章介绍美国《工程索引》的辅助索引编制情况,对比我国检索工具索引编制的现状,探讨如何学习借鉴《工程索引》索引编排的优点,改进我国工具书辅助索引编制的不足,以满足用户多种检索途径的需求。 相似文献
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美国《EiCompendex* Plus》光盘数据库Windows版的检索方法与利用技巧 总被引：4，自引：0，他引：4
举例介绍分析了美国Ei 光盘数据库Window s 版的检索方法与利用技巧, 认为进一步探讨掌握其检索方法与技巧是充分发挥它丰富检索资源的有效途径, 也是提高高校“文献检索与利用”课程教学质量及图书馆读者信息检索服务质量的有效手段。 相似文献
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利用Internet免费检索美国 EI Compendex数据库 总被引：7，自引：0，他引：7
张智雄 《现代图书情报技术》1999,15(1):26-27
作者结合自己的实践经验,举例介绍了利用Internet免费检索美国EI Compendex数据库的方法。 相似文献
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标引人员的智慧与文献标引的质量密切相关。提高标引人员的素养很重要。标引人员需要在标引实践中磨练。自动标引研究已有半个世纪，其标引质量至今未能超过人工标引而取代人工标引，究其原因在于计算机不具备优秀标引人员的智慧，不适应近乎艺术创造的标引作业。可以揣测，没有标引人员介入的、高度自动化的文献标引处理的实现，至少还要等待一个相当长的时间。人工标引研究的成果将有助于自动标引研究中一些难题的解决。不可轻视人工标引的研究。 相似文献
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组配标引是在词表中选择两个及两个以上有形式逻辑关系的词,按照特定规则组成的一组标引词串,用以满足文献多层次、多途径检索的需要。概念组配是文献标引的关键环节。根据参与组配的主题词之间的逻辑关系,概念组配可分为交叉组配、限定组配和联结组配3种基本类型。在实际组配标引工作中,编目员应避免因对新词表不熟悉造成检索词语构成混乱,避免因主题概念转换错误造成粗标、漏标和错标,避免因未遵循专指性标引规则造成切题不当,减少组配标引失误。 相似文献
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两种自动标引法的比较及改造 总被引：5，自引：0，他引：5
方懿 《现代图书情报技术》1996,12(2):20-26
本文主要对汉语文献自动标引的两种方法——切分标记法和单汉字标引法在标引和检索实现上的不同作了比较, 并对两种方法的算法实现提出了一些建议和设想, 旨在推进对自动标引的进一步研究和完善。 相似文献
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一个具体的全文后控检索系统的设计 总被引：4，自引：0，他引：4
周全明 《现代图书情报技术》1996,12(3):32-36
本文除简述了系统设计的总体思想、系统主要特点以及装库、标引、检索等模块的主要功能外, 重点探讨了适应全文检索系统不同时期标引建库需要的三种标引模式, 首次提出了基于全文检索系统标引和后控制成果自学习实现全文本标引用抽词词典的自动积累和完善并建立自动加权标引模式。另外, 还简要论述了全文摘要的机辅生成和后控检索策略的自动构造等重要问题。 相似文献
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对中文科学引文数据库中的被引文献进行作者评价调查 ,证明引文索引词能较好地反映出由其所标引的文献的主题。 相似文献
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中文全文标引的主题词标引和主题概念标引方法1 总被引：20，自引：3，他引：17
中文全文标引正在越来越受到重视。本文主要研究了三个方面的问题，首先是全文主题词标引的加权问题，综合考虑了五个方面的因素；其次是介绍了一种用层次概念词典改进主题词标引质量的新方法；最后又提出了用三种不同的方法产生主题概念进行全文标引的的主题概念标引。受限范围内的实验结果显示本文的方法有一定的理论和实用价值。 相似文献
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When people are connected together over ad hoc social networks, it is possible to ask questions and retrieve answers using the wisdom of the crowd. However, locating a suitable candidate for answering a specific unique question within larger ad hoc groups is non-trivial, especially if we wish to respect the privacy of users by providing deniability. All members of the network wish to source the best possible answers from the network, while at the same time controlling the levels of attention required to generate them by the collective group of individuals and/or the time taken to read all the answers. Conventional expert retrieval approaches rank users for a given query in a centralised indexing process, associating users with material they have previously published. Such an approach is antithetical to privacy, so we have looked to distribute the routing of questions and answers, converting the indexing process into one of building a forwarding table. Starting from the simple operation of flooding the question to everyone, we compare a number of different routing options, where decisions must be made based on past performance and exploitation of the knowledge of our immediate neighbours. We focus on fully decentralised protocols using ant-inspired tactics to route questions towards members of the network who may be able to answer them well. Simultaneously, privacy concerns are acknowledged by allowing both question asking and answering to be plausibly deniable. We have found that via our routing method, it is possible to improve answer quality and also reduce the total amount of user attention required to generate those answers. 相似文献