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Chemnitz, Germany

Chemnitz University of Technology is located in the town of Chemnitz in Germany. With over 10000 students it is the third largest university in Saxony and around 750 international students from 100 universities all over the world are enrolled each year. It was founded in 1836 as Royal Mercantile College and became a technical university in 1986. Wikipedia.

Schreiber M.,TU Chemnitz
Journal of Informetrics | Year: 2013

The arbitrariness of the h-index becomes evident, when one requires q× h instead of h citations as the threshold for the definition of the index, thus changing the size of the core of the most influential publications of a dataset. I analyze the citation records of 26 physicists in order to determine how much the prefactor q influences the ranking. Likewise, the arbitrariness of the highly-cited-publications indicator is due to the threshold value, given either as an absolute number of citations or as a percentage of highly cited papers. The analysis of the 26 citation records shows that the changes in the rankings in dependence on these thresholds are rather large and comparable with the respective changes for the h-index. © 2013 Elsevier Ltd.

The h-index has been shown to have predictive power. Here I report results of an empirical study showing that the increase of the h-index with time often depends for a long time on citations to rather old publications. This inert behavior of the h-index means that it is difficult to use it as a measure for predicting future scientific output. © 2013 Elsevier Ltd.

Newell A.C.,University of Arizona | Rumpf B.,TU Chemnitz
Annual Review of Fluid Mechanics | Year: 2011

In this article, we state and review the premises on which a successful asymptotic closure of the moment equations of wave turbulence is based, describe how and why this closure obtains, and examine the nature of solutions of the kinetic equation. We discuss obstacles that limit the theory's validity and suggest how the theory might then be modified. We also compare the experimental evidence with the theory's predictions in a range of applications. Finally, and most importantly, we suggest open challenges and encourage the reader to apply and explore wave turbulence with confidence. The narrative is terse but, we hope, delivered at a speed more akin to the crisp pace of a Hemingway story than the wordjumblingtumbling rate of a Joycean novel. © 2011 by Annual Reviews. All rights reserved.

Schreiber M.,TU Chemnitz
Journal of the American Society for Information Science and Technology | Year: 2013

The recently proposed fractional scoring scheme is used to attribute publications to percentile rank classes. It is shown that in this way uncertainties and ambiguities in the evaluation of specific quantile values and percentile ranks do not occur. Using the fractional scoring the total score of all papers exactly reproduces the theoretical value. © 2013 ASIS&T.

A new percentile-based rating scale P100 has recently been proposed to describe the citation impact in terms of the distribution of the unique citation values. Here I investigate P100 for 5 example datasets, two simple fictitious models and three larger empirical samples. Counterintuitive behavior is demonstrated in the model datasets, pointing to difficulties when the evolution with time of the indicator is analyzed or when different fields or publication years are compared. It is shown that similar problems can occur for the three larger datasets of empirical citation values. Further, it is observed that the performance evaluation result in terms of percentiles can be influenced by selecting different journals for publication of a manuscript. © 2014 Elsevier Ltd.

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