Based on R(n)-n curve,this article makes a deep analysis of ΔR(n)/Δn from the mathematical,geometrical and actual meanings.The change of ΔR(n)/Δn indicates that there is a clear convergence and dispersion in the a...Based on R(n)-n curve,this article makes a deep analysis of ΔR(n)/Δn from the mathematical,geometrical and actual meanings.The change of ΔR(n)/Δn indicates that there is a clear convergence and dispersion in the actual distribution of the documents of the journals.The area in which ΔR(n)/Δn changes greatly is the core area,the area in which ΔR(n)/Δn changes continuously is the dispersive area,and the point at which the variance of ΔR(n)/Δn is bigger than 1 for the two adjacent journals may be taken as the boundary line between the core area and the non core area.展开更多
文摘Based on R(n)-n curve,this article makes a deep analysis of ΔR(n)/Δn from the mathematical,geometrical and actual meanings.The change of ΔR(n)/Δn indicates that there is a clear convergence and dispersion in the actual distribution of the documents of the journals.The area in which ΔR(n)/Δn changes greatly is the core area,the area in which ΔR(n)/Δn changes continuously is the dispersive area,and the point at which the variance of ΔR(n)/Δn is bigger than 1 for the two adjacent journals may be taken as the boundary line between the core area and the non core area.
