In this work, the characterisation of reaction kinetics of a methylene diphenyl diisocyanate (MDI)-based fast curing polyurethane resin (PUR) and the mathematical description of its curing process are presented. For the modelling of the reaction process isoconversional methods, which are also called model-free approaches, are used instead of model-based approaches. One of the main challenges is the characterisation of a reactive system with a short pot life, which already starts to crosslink ...

Biosurfactants offer environmental as well as health benefits over traditionally used chemical surfactants and heterologous production from engineered microorganisms has been demonstrated, offering containable as well as scalable production of these alternative chemicals. Low product titers and cost intensive downstream processing are the main hurdles for economical biosurfactant production at industrial scales. Increased biosurfactant concentrations are found in the liquid fraction of the fo...

This thesis "Essays on Corporate Social and Resource Responsibility" is based on three research papers, organized in three chapters (chapters 2, 3 and 4). Chapter 1 introduces the topic and overall research questions. The final chapter 5 concludes on the overall project. The thesis discusses CSR and sustainable development on a global and regional scale by using different methodological approaches. lt emphasizes the holistic engagement needed by firms irrespective of their size to ensure sust...

Durch die rasante Verschiebung einer produktionsorientierten Industriegesellschaft zu einer wissensbasierten sowie dienstleistungs- und technologierorientierten Arbeitswelt ergeben sich neue Anforderungen für die Arbeitnehmer. Die erfolgreiche Bewältigung dieser Anforderungen erfordert die flexible Steuerung von Verhalten und setzt in einem beträchtlichen Ausmaß die Ausübung von Selbstkontrolle voraus. Doch dies fordert seinen Tribut: Anforderungen an Selbstkontrolle gelten als eine der bedeu...

We present limit theorems for locally stationary processes that have a one sided time-varying moving average representation. In particular, we prove a central limit theorem (CLT), a weak and a strong law of large numbers (WLLN, SLLN) and a law of the iterated logarithm (LIL) under mild assumptions that are closely related to those originally imposed by Dahlhaus and Polonik (2006).

Ras proteins, most notably isoform KRas4B are frequently mutated oncogenes in numerous human cancers and associated with poor prognosis. Despite ambitious research affords since the discovery of Ras proteins as human oncogenes in 1982, no pharmacological therapy approach reached the clinic yet and Ras is still viewed as “undruggable” protein. For signal propagation, Ras proteins have to be localized at the plasma membrane. Enrichment there is facilitated by spatial cycles that utilize the pre...

Micelle-like polymer particles have been applied in aqueous multiphasic hydroformylation reactions of long chain alkenes. These colloids act as phase transfer agents for the nonpolar substrates and as carriers for the catalyst bearing sulfonated ligands by electrostatic attraction. The catalyst performance and the phase separation were optimized with special focus on the conversion, selectivity and catalyst recovery, as those are key points in multiphasic systems to achieve a feasible industr...

The reaction of sodium chloride with 2-[bis­(2-hy­droxy­eth­yl)amino]­ethan-1-ol results in the formation of the title salt {[Na{N(CH2CH2OH)3}]Cl}n. The polymeric structure is characterized by a sodium cation coordinated by one nitro­gen and five oxygen atoms in a distorted octa­hedral environment. The resulting one-dimensional {—O—Na—O—Na—O}— coordination polymer extends parallel to [010] and is connected through the chloride counter-anion via O—H...Cl hydrogen bonding, giving rise to a two-...

Using atmospheric plasma spraying (APS), ceramic Al2O3 and ZrO2-8Y2O3 thermal barrier coatings (TBC) were applied on AISI H11 (1.2343) and subsequently polished to serve as a substrate to magnetron sputter CrAlSi7.5N and TiAlSi7.9N films. The influences of polishing as well as plasma etching processes on the surface roughness and residual stresses of the TBCs were correlated with the adhesion of the metal nitride films. As metallic interlayers are typically used to metallize insulating substr...

In this paper we consider the optimal design problem for extrapolation and estimation of the slope at a given point, say z, in a polynomial regression with no intercept. We provide explicit solutions of these problems in many cases and characterize those values of z, where this is not possible.

Recent research in the educational context has focused not only on academic achievement but also on subjective well-being (SWB) as both play a major role in students’ lives. Whereas the determinants of academic achievement have been extensively investigated, little research has been conducted on school-related determinants of SWB in comparison with other students’ characteristics. In the present cross-sectional study, we set out to investigate whether perceived school climate predicts school ...

Although participation in higher education (HE) has expanded in Europe, social inequalities remain a major political challenge. As HE expansion has not led to equal access and success, the mechanisms behind policies seeking to reduce inequalities need to be examined. Focusing on the widening participation agenda, this article investigates how universities translate political demands to their local contexts. The translation perspective is adopted to study the German HE system as an example cha...

Die vorliegende Dissertation behandelt den Einfluss neuer Physik auf die Messungen aktueller Neutrino-Oszillations-Experimente. Insbesondere wird eine neue modellunabhängige Methode zur Analyse der CP-Verletzung in Neutrino Oszillationen entwickelt, die auf Unitaritäts-Argumenten beruht. Es wird gezeigt, dass aktuelle Experimente wie T2K oder NOvA in der Lage sind, den Parameter-Bereich für viele Modelle stark einzuschränken. Durch Einbeziehen der Materie-Effekte in diese neue Methode ergeben...

Tropane alkaloids (TA) are valuable secondary plant metabolites which are mostly found in high concentrations in the Solanaceae and Erythroxylaceae families. The TAs, which are characterized by their unique bicyclic tropane ring system, can be divided into three major groups: hyoscyamine and scopolamine, cocaine and calystegines. Although all TAs have the same basic structure, they differ immensely in their biological, chemical and pharmacological properties. Scopolamine, also known as hyosci...

School leadership acted an important function in student achievement. This study explored the relationship between school leadership of principal and student mathematics achievement in primary schools from a comparative perspective of Germany and Chinese Taipei. The author used TIMSS 2011 data collected from 3,961 fourth-grade students and 197 school principals in Germany and 4,138 students and 150 school principals in Chinese Taipei respectively, to examine the relationship between school le...