Calculation formula: if (k) = (NK-1+NK-2)/(NK-1+NK-2)
Description:
K refers to a certain year, Nk- 1+Nk-2 refers to the number of papers published in the previous two years, and Nk- 1 and Nk-2 refers to the number of cited articles in K years. In other words, the impact factor of a journal in 2005 is the total number of cited papers published in 2004 and 2003 divided by the total number of papers published in 2004 and 2003 (citable papers).
Extended data:
The center's core publications:
Generally speaking, Chinese core periodicals refer to the periodicals listed in the Outline of National Chinese Core Periodicals published by Peking University Library every four years (published every three years after 20 1 1 year), and the latest edition is 20 1 1 year. The summary of Chinese core periodicals is an academic definition of a certain kind of periodicals and a classification of periodicals.
Its target is academic journals in China. It is a periodical divided according to various factors such as periodical influence factors. Chinese core journals are appraised by Peking University Library in conjunction with a number of authoritative experts in academic circles.
In terms of influence, its ranking is one of the more authoritative in the same category, and it is the most authoritative in academic influence except Nantah Core and China Science Citation Database (cscd). Traditionally, the core journals of Peking University are evaluated by Peking University Library every four years, and a book "Catalogue of Core Journals of Peking University" is published.
Baidu Encyclopedia-Journal Impact Factors
Baidu Encyclopedia-Core Publications