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影响因子又称期刊论文的平均被引率，是指期刊论文的被引量与期刊论文的可被引量之间的比值。一种期刊某年的影响因子，是将当年在全部统计源刊上引用该刊前两年内发表的论文总次数除以该刊在同一时期内所发表的论文总数而确定。据中国科技信息研究所１９９８年１０月公布的数
Impact factor, also known as the average rate cited papers periodicals, refers to the periodical essay quotations and periodical papers can be quoted ratio between. The impact factor of a journal in a particular year is determined by dividing the total number of papers published in the two years prior to citation in all statistical sources in that year by the total number of papers published in the same period. According to China Science and Technology Information Institute released in October 1998 number