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# A central limit theorem for normalized products of random matrices

Periodica Mathematica Hungarica
Authors: Rolando Cavazos-Cadena and Daniel Hernández-Hernández

## Abstract

This note concerns the asymptotic behavior of a Markov process obtained from normalized products of independent and identically distributed random matrices. The weak convergence of this process is proved, as well as the law of large numbers and the central limit theorem.

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# Parameter identification of the observed citation distribution

Scientometrics
Authors: Guang Yu and Yi-Jun Li

## Abstract

Based on the transfer function model of the observed citation distribution and the expression of the cumulative citation probability distribution, parameters of 12 citation distributions are identified from statistical data of age distributions of references of 10 journals in JCR using the parameter optimization fitting method. At same time, based on the steady state solution of differential equations of the publication delay process and data of publication delays of 10 journals, the publication delay parameters of every journal are identified using the fitting method. Identified parameters of every journal citation distribution are compared with the journal’s publication delay parameters and some valuable conclusions are deduced.

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# Mathematical model of delay in the secondary literature publishing process

Scientometrics
Authors: Guang Yu, Yihong Rong, and Yijun Li

## Abstract

In this paper, the internal law of delay in the secondary literature publishing process is presented. The process is demonstrated to abide by the partial differential equation of periodical literature publishing process. A definite solution of the publishing delay process is derived. Accordingly, the expression of average publication delay indicator based on the particular solution is deduced. Then the problem is studied that some information of primary literatures is missed in information retrieval, and the relationship is established between the average delay indicator and the miss ratio of primary literatures in the index periodicals or databases. Also it is proposed that the primary literature should be used as a supplemental tool in information retrieval to guarantee the recall ratio.

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# The influence of publication delays on impact factors

Scientometrics
Authors: Guang Yu, Xiao-Hong Wang, and Da-Ren Yu

## Summary

Based on the convolution formula of the disturbed aging distribution (Egghe&Rousseau, 2000) and the transfer function model of the publishing delay process, we establish the transfer function model ofthe disturbed citing process. Using the model, we make simulative investigations of disturbed citation distributions and impact factors according to different average publication delays. These simulative results show that the bigger increment the average publication delays in a scientific field, the larger shift backwards of the citation distribution curves and the more fall the impact factors of journals in the field. Based on sometheoretical hypotheses, it is shown that there exists theoretically an approximate inverse linear relation between the field (or discipline) average publication delay and the journal impact factor.

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# Molecular diagnosis of sepsis: New aspects and recent developments

European Journal of Microbiology and Immunology
Authors: O. Liesenfeld M.D., L. Lehman, K.-P. Hunfeld, and G. Kost

E.C. Reisinger G.J. Krejs H. Olschewski 2007 Delayed processing of blood samples influences time

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