SCI journals are ranked by impact factors, with the top 5% being the first region, the top 20% being the second region, the top 50% being the third region and the rest being fourth area.
American Science Citation Index was founded by institute for scientific information in Philadelphia on 1957. It is a citation database established and published by institute for scientific information in the United States at 196 1. SC, EI and ISTP are three world-famous scientific and technological literature retrieval systems.
It is an internationally recognized main retrieval tool for scientific statistics and scientific evaluation, among which SCI is the most important.
SCI has two zoning rules: JCR zoning and Chinese Academy of Sciences zoning.
According to the impact factor (IF value), all journals of a certain discipline are arranged in descending order according to the impact factor of the previous year, and then divided into four parts (each accounting for 25%), namely Q 1, Q2, Q3 and Q4.
The zoning method of China Academy of Sciences is as follows: the first area journals: the top 5% of the three-year average impact factor of various journals, the second area journals: the top 6% ~ 20%, the third area journals: the top 2 1% ~ 50%, and the fourth area journals: the last 5 1% ~ 100%.
The difference between sci area, area 2, area 3 and area 4;
First, the first district periodicals
The journals in the first district have the highest impact factor, the highest academic value and the greatest influence, while the journals in the fourth district have the lowest impact factor among the four districts.
No matter whether it is the first district of jcr Division or the first district of Chinese Academy of Sciences, as long as it is a district periodical, it is an internationally renowned academic periodical.
These periodicals are difficult to publish, and not everyone can publish them. For ordinary authors, it is very difficult, not to mention the article is difficult to write, and there may be a certain threshold for the author's identity and status.
Journals in one region are not suitable for publication by different authors. Generally, what can be published in a field are some experts and scholars, professors from famous universities, or some researchers who have certain influence in their own majors.
Periodicals in the second and second districts
The periodicals in the second district are second only to those in the first district, but the number of domestic authors in the second district is more. At present, some domestic standards explicitly require the publication of two or more periodicals, so two-zone periodicals are the first choice for many domestic authors.
The publication of periodicals in the second district is slightly less difficult, but it depends on the specific disciplines and periodicals. The general rule is that the periodicals in the second district are easier than those in the first district.
Three-district and four-district periodicals
It will be less difficult to publish periodicals in three districts and four districts, but there are some disputes in China. It is precisely because of the above rigid requirements that some units and universities do not recognize publications below the second district.
Many authors will think that the publications in three districts and four districts are not worth publishing, but it is not easy for most ordinary authors to publish sci papers.