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运用灰色预测理论,通过对有限时间范围内的文献引用频次的线性微分拟合,给出了文献老化的历时研究半衰期的测定公式.以《中国药理学报》、《药学学报》、《中国药学杂志》、《中草药》、《中国中药杂志》的引文为样本数据源,跟踪了1981年发表的文献的引用频次,并测定出药学期刊文献老化的历时半衰期大约为6.4年.
By using the gray prediction theory, this paper gives a formula for determining the half-life of the study on the aging of the literature by linear differential fitting of the frequency of the cited documents in the limited time range.According to “Chinese Journal of Pharmacology”, “Pharmaceutical Journal”, “Chinese Pharmaceutical Journal Chinese herbal medicine ”,“ Chinese herbal medicine ”,“ Chinese herbal medicine ”as the sample data source, tracking the quoted frequency of the articles published in 1981 and determining the lasted half-life of the aging of the pharmaceutical journals is about 6.4 years.