meaningful to examine critically what the journal impact factor really is, i.e. is it an indicator (or proxy) for quality, or for quantity, or some more subtle performance indicator? Raj and Zainab ( 2012 ) has recently pointed out that the issue surrounding
There is no doubt that high-performance thin-layer chromatography (HPTLC) can be applied as a quantitative method if the technique is properly used. Densitometry is a commonly used detection mode for quantitation in HPTLC. The influence of instrumental settings on signal intensity, peak resolution, and peak positioning was rarely described in literature. Especially, quantitation of adjacent substance zones was critical when improper combinations of these settings merge. Future trends regarding ultrathin-layer chromatography and hyphenation to scanning or imaging mass spectrometry required the consideration of these delicate points. The influence of different instrumental settings on the obtained signal intensities was demonstrated for four separated parabens (each 150 ng band−1). The maximum mean signal deviations of all four compounds were 6.9% by the optical system, 16.8% by the scan slit dimension, 7.5% by the scan speed, and 1.5% by the data resolution. The influence of these settings on the quantitation of three parabens in two skin protection creams was investigated. Depending on the selected settings, deviations of the calculated substance amount of up to 5.6% were yielded, whereby determination coefficients of the polynomial calibration curves (60–300 ng band−1) varied between 0.9985 and 0.9999. The setting of integration markers between two adjacent peaks was demonstrated to be deficient if low spatial data resolution is applied; however, this challenging task will rise in interest due to the trend towards miniaturization.
An indicator called the performance index (p-index) which can effectively combine size and quality of scientific papers, mocking what the h-index could do, emerges from an energy like term E = iC, where i is a measure of quality, expressed as the ratio of citations C to papers published P. In this paper, we demonstrate how this energy paradigm can be used for bibliometric research assessment. The energy assessment
technique is demonstrated by applying it to the research assessment of all the countries listed in Essential Science Indicators.
Partitioning is easily done by using contour lines on the two-dimensional iCE (impact–Citations–Energy) map.
Authors:Willem Trommel, Taco Brandsen, Mirjan van Heffen-Oude Vrielink and Maaike Moulijn
Bouckaert, G. (1995): Improving performance measurement. In: Halachmi, G. B. A. (ed.): The Enduring Challenges in Public Management: Surviving and Excelling in a Changing World. San Francisco: Jossey-Bass, 379