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Maribor, Slovenia

The University of Maribor is Slovenia's second university, established in 1975 in Maribor, Slovenia. It currently has 17 faculties. Wikipedia.

In Part I of this study, the high corrosion inhibition effectiveness of 2-mercaptobenzimidazole (MBIH) in 3. wt.% NaCl solution was unambiguously proven. In Part II, using angle-resolved X-ray photoelectron spectroscopy (XPS), the surface chemical structure and composition of adsorbed MBIH on Cu from the same solution was investigated. It was found that MBIH molecules are directed toward the Cu surface through their N and S atoms. The MBIH layer thickness is 1.9. ±. 0.5. nm, as determined from a detailed analysis of the background in the XPS spectra. Tentative MBIH orientations on Cu were suggested based on the XPS measurements. © 2013 Elsevier Ltd.

In this study, the influence of the amino functional group in the 1,2,4-triazole at position C3 (the 3-amino-1,2,4-triazole compound), on the surface layer formation and surface chemistry of these two Cu corrosion inhibitors is explored. Special attention is devoted to the orientation of these two molecules and the way they bond to the Cu surface. With the aim of obtaining electrochemical quartz crystal microbalance and X-ray photoelectron spectroscopy measurements, the article discusses why differences in the corrosion inhibition effectiveness of these two molecules exist. Moreover, the thicknesses of the inhibitor surface layers formed on the Cu are determined. © 2013 Elsevier Ltd.

The high corrosion inhibition effectiveness of 2-mercaptobenzimidazole (MBIH) in 3. wt.% aqueous NaCl solution is reported using long term immersion tests, 3D-profilometry, electrochemical impedance spectroscopy, and potentiodynamic curve measurements. The high corrosion inhibition performance was proven after 180. days of immersion. The impedance spectra were characterized by two time constants relating to charge transfer and finite layer thickness or semi-infinite diffusion of copper ions through the surface layer, therefore Cu corrosion in solution containing MBIH follows kinetic-controlled and diffusion-controlled processes. Moreover, it is shown that MBIH is a mixed-type inhibitor. © 2013 Elsevier Ltd.

Perc M.,University of Maribor
Journal of the Royal Society Interface | Year: 2014

The Matthew effect describes the phenomenon that in societies, the rich tend to get richer and the potent even more powerful. It is closely related to the concept of preferential attachment in network science, where the more connected nodes are destined to acquire many more links in the future than the auxiliary nodes. Cumulative advantage and success-breads-success also both describe the fact that advantage tends to beget further advantage. The concept is behind the many power laws and scaling behaviour in empirical data, and it is at the heart of self-organization across social and natural sciences. Here, we review the methodology for measuring preferential attachment in empirical data, as well as the observations of the Matthew effect in patterns of scientific collaboration, socio-technical and biological networks, the propagation of citations, the emergence of scientific progress and impact, career longevity, the evolution of common English words and phrases, as well as in education and brain development. We also discuss whether the Matthew effect is due to chance or optimization, for example related to homophily in social systems or efficacy in technological systems, and we outline possible directions for future research. & 2014 The Authors. Published by the Royal Society.

Kegl B.,University of Maribor
Applied Energy | Year: 2011

This paper discusses the influence of biodiesel on the engine combustion characteristics. The considered fuel is neat biodiesel from rapeseed oil. The considered engine is a bus diesel engine with injection M system. The engine characteristics are obtained by experiments and numerical simulation. The results obtained with biodiesel are compared to those obtained with mineral diesel under various operating regimes. In this way, the influences of biodiesel usage on the injection pressure, injection timing, ignition delay, in-cylinder gas pressure and temperature, heat release rate, exhaust gas temperatures, harmful emissions, specific fuel consumption, and on engine power are analyzed. Furthermore, the relationships among fuel properties, injection and combustion characteristics, harmful emissions, and other engine performance are determined. Special attention is given to possible explanations of higher NO. x emission in spite of lower in-cylinder gas temperature. © 2010 Elsevier Ltd.

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