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【目的】全面分析国际权威科技期刊非可被引文献(NCD)的引证特征以及其对影响因子(IF)的贡献。【方法】选择2014年被SCI数据库收录的、IF较高且发文数量较大的10种国际权威科技期刊为研究对象,统计2年引证时间窗口下,各刊可被引文献(CD)数量、NCD数量、被引频次、自引等情况;分析NCD的被引和NCD对CD的施引情况;最后对不同类型NCD的引证效率以及其对IF的贡献进行研究。【结果】10种国际权科技威期刊发文数量、被引频次、自引量百分比较高的NCD类型是社论、信稿、科技新闻,3种文献引证效率也较高;NCD的被引量和NCD对CD的引用量在IF被引量中占据很大一部分,最高达42.66%;NCD对IF的贡献率最高达32.83%。【结论】NCD不仅可被引而且还对文献进行施引,社论、信稿、科技新闻对期刊被引频次和IF的贡献较高,NCD对IF的贡献率不容忽视。
【Objective】 To comprehensively analyze the citation characteristics of non-citable documents (NCDs) of international authoritative scientific journals and their contribution to impact factors (IFs). 【Method】 Ten international authoritative sci-tech periodicals with high IF and large number of papers published in SCI database in 2014 were selected as research objects. According to the statistics of the number of cited papers (CDs) in each period under the two-year citation time window, The number of NCDs, the frequency of citation and the number of cites; the analysis of the citation of NCDs and NCDs to CDs; and finally, the citation efficiency of different types of NCDs and their contribution to IFs. 【Result】 The results showed that the NCD types of the number of citations, cited citations, and self-cited percentages of the 10 kinds of international authority science and technology periodicals were editorials, letters and scientific news, and the cited rates of the three kinds of documents were also high. The quotation of CD by NCD accounts for a large part of the quoted amount of IF, up to 42.66%. The contribution rate of NCD to IF is up to 32.83%. 【Conclusion】 NCD can not only be cited but also be used as a reference for the literature. Editorials, letters, and technical news contributed a lot to citation frequency and IF of journals, and the contribution rate of NCD to IF can not be ignored.