1, total cited frequency: refers to the total number of citations of all papers published by a journal in a statistical year since its inception, which can show the extent to which the journal is used and valued, as well as its role and position in scientific exchanges.
2. Impact factor: the average number of citations of each paper published in the first two years of this journal is used to reflect the academic influence of this journal in recent years and its recent role in scientific development and literature exchange.
3. Real-time index: the average number of citations of each published paper in the current year can be used to measure the speed at which journal papers are used and the rapid response of journals to new scientific problems in the process of discipline development.
4. Cited half-life: refers to the time span for the publication of the newer half of the cited papers in all times of a journal in a certain year, reflecting the aging speed of the journal literature.
5. Citation half-life: refers to the number of recent years in which the newer half of all references cited by a journal in a certain year have been published; Explain that journals are particularly interested in references published for how long.
6. Journal citation rate: the ratio of the number of times a journal is cited by other journals to the total number of times it is cited, which is used to measure the breadth of academic exchanges, the width of professional fields and the interdisciplinary degree of a journal.
7. Average citation rate: In a given period of time, each journal article refers to the amount of literature, which is used to measure the average citation level of a journal and examine the ability of a journal to absorb information and the level of scientific communication.
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VIP Chinese periodical database is the largest digital periodical full-text database in China. At present, there are more than 7,000 fixed unit users, including Hong Kong, Macao and Taiwan. It is one of the core resources of digital library construction in China, an important part of the literature guarantee system of university libraries, and an essential database for scientific researchers to verify and novelty search.
There are more than 4500 kinds of periodicals with historical changes, and the collection period starts from 1989 (some periodicals can be traced back to the founding year). There are more than 9,600 journals, and the total number of documents with complete subject coverage reaches 57 million, with an increase of more than 6 million articles every year. The only product that completely includes the 20 1 1 edition and the 20 14 edition of core journals.
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