What is the meaning of sci impact factor is introduced as follows:

The impact factor of sci refers to the average number of citations of the literatures published in the previous two years in this year. The higher the impact factor, the higher the academic level of the publication. Impact factor (IF), one of the important indexes to evaluate the influence of SCI journals, is published in Journal Citation Reports (JCR) published by Thomson Reuters every June. IF is calculated by dividing the total number of citations of papers published in the first two years of SCI by the total number of papers published in the first two years of SCI.

Impact factor (IF)

Some climatic factors, such as air humidity, wind and clouds, generally do not have a great impact on crops, but only strengthen or weaken the basic factors, which are called "influencing factors" or "environmental factors". Only when they reach a certain intensity or cooperate with other factors will they have a certain impact on crops.

Impact factor calculation

The impact index is the total number of citations (U) x (the total number of citations in the previous two years) of a journal in a statistical year divided by the total number of papers published in the previous two years (S, T) y (the total number of papers published in the previous two years). This is an internationally accepted periodical evaluation index. The formula is: IFU =(X(S, T)/Y(S, t)).

Paper influence factor

Characteristics of influencing factors

(1) is simple in calculation and easy to popularize, so it is widely used.

(2) English-based periodicals are unfair to periodicals in other languages;

(3) The statistical time is 2 years, without considering the law that multiple disciplines reach the peak of citation;

(4) The influence of journal self-citation is not excluded, which gives some journals the opportunity to operate IF;

(5) It is impossible to eliminate the differences between disciplines and research types, and it is difficult to directly compare different topics without considering the characteristics of different disciplines;

(6) Journal impact factors do not evaluate the quality of citation behavior in the calculation process, but only count the absolute number of citations.