JCR partition: the full name of JCR is "Journal? Quote? " Report, Ke Rui Wei 'an divides the journals collected into 176 subject categories every year, and further divides them into 4 regions according to the level of IF:
Q 1: top 25%
Q2:25%~50%
Third quarter: 50%~75%
Q4:75%~ 100%
Publications usually located in Q 1 become top-level publications.
Division of Chinese Academy of Sciences: For the first time, Chinese Academy of Sciences 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? Big category. Then, the journal 13 is divided into four grades, that is, four districts.
According to the influence factors of various journals:
The top 5% is 1? Area;
6%~20%? For two? Area;
2 1%~50%? Three people? Area;
The rest is fourth area.