The American Science Citation Index (SCI) was founded by the institute for scientific information in Philadelphia in 1957, and it is a citation database created and published by institute for scientific information (ISI)1961+0.

SCI (Science Citation Index), EI (Engineering Index) and ISTP (Science and Technology Conference Index) are three world-famous retrieval systems for scientific documents, which are internationally recognized as the main retrieval tools for scientific statistics and scientific evaluation, among which SCI is the most important.

The extended material EI is released every month 1 issue, and the summary of13,000 to14,000. Every year, 500,000 engineering documents are added to the database. The data comes from 565,438+000 engineering journals, conference papers and technical reports. The original documents come from more than 40 countries, involving as many as 39 languages, of which 3600 have abstracts. More than 654.38+600,000 articles are reported every year. Each issue is accompanied by a subject index and an author index; Annual volume and annual index are also published every year.

SCI: evaluation criteria

From 65438 to 0976, ISI derived journal citation report (JCR) from SCI, which provided a set of statistical data to show the citation of scientific journals, the number of published papers and the average citation of papers. The impact factor (IF) of each journal can be calculated in JCR. The level of influencing factors can reflect the influence of a journal to some extent.

Refer to Baidu Encyclopedia-EI