以《全国报刊索引》（自然科学技术版）为依据,从中选择24个学科,就每个学科的论文在不同类型期刊中分布的篇数,占调查论文总数的百分比、涉及期刊种数、文献密度4项指标进行认真的调查与分析,展示一个学科的期刊文献在不同类型期刊中的分布规律、分布特点和分布形态。 Based on the “Index of National Newspapers and Periodicals” (Natural Science and Technology Edition), 24 subjects are selected, and the number of dissertations distributed in different types of periodicals in each discipline, as a percentage of the total number of dissertations, the number of periodicals and literature Density of four indicators of serious investigation and analysis to show a discipline of journal articles in different types of journals in the distribution of the characteristics and distribution patterns.