There are two kinds of SCI zoning, one is international zoning-JCR zoning; One is the domestic branch-the branch of the Chinese Academy of Sciences. JCR zoning is published by Ke Rui Wei 'an Company every June. SCI papers are classified according to various disciplines, and then sorted according to influencing factors, and divided into four areas on average.
The Department of China Academy of Sciences is published annually by the Document Information Center of China Academy of Sciences 10- 12. It is also sorted by discipline classification and influencing factors, but the criteria for division are stricter and there are fewer journals in one field.
I. JCR zoning
The influence factors of JCR on SCI journals are counted. JCR divides journals into 176 different disciplines.
According to the impact factors of journals, each subject classification is divided into four areas on average: Q 1, Q2, Q3 and Q4. In the classification of various disciplines, the top 25% (including 25%) of journals with impact factors are classified as Q 1 region, the top 25% ~ 50% (including 50%) are Q2 region, and the top 50% ~ 75% (including 75%) are.
Two. Department of China Academy of Sciences
Chinese Academy of Sciences first divided all journals in JCR into mathematics, physics, chemistry, biology, geoscience, astronomy, engineering technology, medicine, environmental science, agriculture and forestry science, social science, management science and comprehensive journals 13. Then, the journal 13 is divided into four grades, that is, four districts.
According to the impact factors of various journals, the top 5% is 1, 6% ~ 20% is 2, 2 1% ~ 50% is 3, and the rest is 4.
What is the difference between the first, second, third and fourth zones of SCI? Generally speaking, the journals in the first district are the top journals with high influence and academic quality, and are considered as the first choice for high-level research institutes.
The academic quality and influence of periodicals in the second district are higher, but slightly lower than that in the first district. The academic influence and quality of periodicals in the third district are lower than those in the second district; Journals in the four regions are more marginalized, and their academic level and influence are relatively low.