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Aufsatz
Comparative investigation of two-dimensional imaging methods and X-ray tomography in the characterization of microstructure
(2017-10-02)
The microstructural features of three different materials have been quantified by means of 2D image analysis and X-ray micro-computer tomography (CT) and the results were compared to determine the reliability of the 2D analysis in the material characterization. The 3D quantification of shrinkage pores and Fe-rich inclusions of an Al-Si-Cu alloy by X-ray tomography was compared with the statistical analysis of the 2D metallographic pictures and a significant difference in the results was found due to the complex ...
Aufsatz
Assessing segmental versus non-segmental features in the ventral nervous system of onychophorans (velvet worms)
(2017-01-03)
Background:
Due to their phylogenetic position as one of the closest arthropod relatives, studies of the organisation of the nervous system in onychophorans play a key role for understanding the evolution of body segmentation in arthropods. Previous studies revealed that, in contrast to the arthropods, segmentally repeated ganglia are not present within the onychophoran ventral nerve cords, suggesting that segmentation is either reduced or might be incomplete in the onychophoran ventral nervous system.
Results: ...
Dissertation
Theatralität als Visualisierungsstrategie in der niederländischen Malerei des 17. Jahrhunderts
(2017-05)
In der vorliegenden Dissertation wurden erstmals Theaterdarstellungen und Gemälde mit Motiven der darstellenden Kunst über Gattungsgrenzen hinweg als ein Phänomen untersucht, das in der visuellen Kultur der Niederlande des 17. Jahrhunderts, in der das Theater einen festen Bestandteil des öffentlichen Lebens bildete, sichtbar verankert ist. Zwei verschiedene Arten von Gemälden mit Theaterbezug stehen im Mittelpunkt: Die in weitaus geringerer Zahl vorkommenden Theaterdarstellungen sind wie scheinbar authentische ...
Aufsatz
Report for Politicians
(2017)
Purpose – This paper provides a comprehensive overview of the understanding of politicians about social entrepreneurship and its ecosystem. These findings are contrasted with the needs and wishes of social entrepreneurs. Design/methodology/approach – The research used a qualitative research approach. We conducted in-depths interviews with entrepreneurs, politicians, and high-level responsible administrators responsible persons of eight European countries. Data analysis covers pattern matching and case comparison. ...
Aufsatz
Report for Chambers of Commerce and Start-up Centres
(2017-08-18)
Purpose – This report provides a comprehensive overview of the needs and wishes of entrepreneurs and contrasts them with the spectrum of services and support offered by start-up centres and chambers of commerce who participated in this study. Design/methodology/approach – The paper uses a qualitative research approach. In total, we conducted 57 in-depths interviews with entrepreneurs, start-up centres and the chambers of commerce of eight European countries. Data analysis covers pattern matching and case comparison. ...
Dissertation
Impact of ownership concentration and corporate governance on sustainability and stakeholder risk: An empirical Analysis of listed firms from USA, UK and Germany.
(Corporate ownership and control, 2017-03-05)
This thesis contributes to and extends the literature by observing the impact of corporate governance and different attributes of board effectiveness and firm level corporate governance mechanism on stakeholder risk. Like shareholders, stakeholders also face the agency problem and fear losing their hidden resources and efforts. This thesis defines this fear of losing resources and efforts and long-term sustainability prospects as stakeholder risk. Here, it is worthwhile to mention that this thesis also contributes ...
Aufsatz
Electron beam welding of Fe–Mn–Al–Ni shape memory alloy: Microstructure evolution and shape memory response
(2017-07-03)
The present study reports on the impact of abnormal grain growth (AGG) on the microstructural evolution following electron beam (EB) welding of Fe–Mn–Al–Ni shape memory alloy (SMA). Polycrystalline sheet-like material was EB-welded and a cyclic heat treatment, studied in previous work, was conducted for inducing AGG and a bamboo-like microstructure, respectively. Optical and electron microscopy were carried out to characterize the prevailing microstructure upon cyclic heat treatment. For characterization of the ...
Aufsatz
Time-of-Flight Three Dimensional Neutron Diffraction in Transmission Mode for Mapping Crystal Grain Structures
(2017-08-25)
The physical properties of polycrystalline materials depend on their microstructure, which is the nano- to centimeter scale arrangement of phases and defects in their interior. Such microstructure depends on the shape, crystallographic phase and orientation, and interfacing of the grains constituting the material. This article presents a new non-destructive 3D technique to study centimeter-sized bulk samples with a spatial resolution of hundred micrometers: time-of-flight three-dimensional neutron diffraction (ToF ...
Buch
Didactics of Mathematics in Higher Education as a Scientific Discipline
(2017-03-15)
Mathematics education at the tertiary level is a practical concern in many institutions of higher education, and efforts are being made world-wide to improve its quality. A growing number of mathematicians and mathematics educators see the need for doing research and thoughtful development work in mathematics education not only at school level, but also at tertiary level. To give momentum to the establishment of a scientific community of mathematicians and mathematics educators whose concern is the theoretical ...
Aufsatz
Aphyllophoroid fungi in insular woodlands of eastern Ukraine
(2017-12-22)
Background
Fungi play crucial roles in ecosystems and are among the species-richest organism groups on Earth. However, knowledge on their occurrence lags behind the data for animals and plants. Recent analyses of fungal occurrence data from Western, Central and Northern Europe provided important insights into response of fungi to global warming. The consequences of the global changes for biodiversity on a larger geographical scale are not yet understood. Landscapes of Eastern Europe and particularly of eastern ...