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自从十七世纪中叶世界上第一种期刊问世以来,期刊的种类迅猛发展.据有关资料统计,全世界的期刊种类目前已超过18万种.期刊以其信息传递快、文献容量大、资料内容新、出版周期短等特点,迅速在传递科技情报、交流学术信息方面占据了极为重要的位置,也越来越被人们所重视与利用.科学文献的分布具有内在的规律性,就科学论文在期刊中的分布而言,其中最基本最普遍的规律是文献聚散规律.其表现为:在某个学科的文献中,一方面大部分论文高度集中在相对少数的期刊中;另一方面却有一部分论文分散在数量众多的其他期刊上,前者就是该学科的核心期刊,而后者则可能
According to statistics, the number of journals in the world has now exceeded 180,000.Journal with its rapid information transmission, literature, large capacity, the contents of the information New and short period of publication, it occupies an extremely important position in the transmission of scientific and technological intelligence and exchange of academic information, more and more people attach importance to and utilize it.The distribution of scientific literature has inherent regularity, The distribution of periodicals, one of the most basic and most common law is the law of polygamy.Its manifestations: in a subject literature, on the one hand most of the papers are highly concentrated in a relatively few journals; on the other hand Some papers are scattered in a large number of other journals, the former is the core journals of the discipline, while the latter may be