Thèse de doctorat : Université de Fribourg, 2020.
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Thèse de doctorat : Université de Fribourg, 2017 ; no. 2052.
The present PhD thesis includes three different projects which belong to the domain of inner-shell atomic physics and high energy resolution X-ray spectroscopy. The first project consists of a series of in-house measurements of the characteristic K and L X-ray absorption spectra (XAS) of several 3d, 4d and 5d transition metals. For this project the target chamber of the von Hamos curved crystal...
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Thèse de doctorat : Université de Fribourg, 2016 ; no. 1981.
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Thèse de doctorat : Université de Fribourg, 2016 ; no. 1995.
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Thèse de doctorat : Université de Fribourg, 2016 ; no. 1984.
Sarracenia purpurea is a carnivorous pitcher plant from North America and a model system for aquatic communities. After the pitchers fill up with rainwater, a food web forms in these detritus-fueled ecosystems ranging from bacteria to insect larvae, including the top predator Wyeomyia smithii. Two weeks after opening this food webs consists only of a handful of small and fast dispersing species...
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Thèse de doctorat : Université de Fribourg, 2006 ; no. 1503.
The use of organometallic complexes as catalysts became a very significant topic in the field of material chemistry. However, despite of this development, only few of them contain iron(II), except the tridentate complex diimine pyridine developed by Gibson and Brookhart and employed in the olefin polymerization. Unfortunately, this model suffers by its lack of tolerance towards the minor changes...
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Thèse de doctorat : Université de Fribourg, 2017 ; no. 2015.
This thesis is a study of the role of the metal oxide electron transporting material in perovskite solar cells. The central research question is how the metal oxide influences the stability of perovskite solar cells and how the metal oxide can be modified to improve the stability. The thesis begins by providing four background chapters. Chapter 1 explains the need for solar energy and what...
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Thèse de doctorat : Université de Fribourg, 2018 ; no. 2066.
Why do photoreceptors differentiate in the eye? Though simple, biologically this is an important question, and it may prove complex to answer. To present a bigger picture: animals have evolved a diversity of highly specialised sensory organs, which they use to obtain information from their environment and thus survive. These organs contain different types of receptor neurons. For example, there...
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Thèse de doctorat : Université de Fribourg, 2015 ; no 1944.
Cette thèse traite de deux problèmes en géométrie hyperbolique réelle et complexe. On étudie dans un premier temps des structures géométriques sur des espaces de modules de métriques plates a singularités coniques sur la sphère. D'après des travaux de W. Thurston, l'espace de modules des métriques plates sur S2 à n singularités coniques d'angles donnes admet une structure de...
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Thèse de doctorat : Université de Fribourg, 2015 ; no. 1932.
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