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Dissertation
Further development of indicators for the assessment of soil biodiversity using the example of earthworms and springtails (Collembola) with particular reference to organic farming
(2018-06-28)
Eine wichtige Grundlage des ökologischen Acker- und Pflanzenbaus ist die möglichst optimale Nutzung von Nährstoffen aus organischer Substanz. Da deren Umsatz im Boden maßgeblich von der Bodenmakrofauna (Regenwürmer) und der Bodenmesofauna (Springschwänze) beeinflusst wird ist es wichtig einschätzen zu können wie der Zustand dieser Organismengruppen ist. Hierzu werden aussagekräftige Indikatoren benötigt.
Ziel dieser Dissertation war es, solche Indikatoren weiterzuentwickeln, wobei ein besonderes Augenmerk auf der ...
Dissertation
Strukturelle und magnetische Veränderungen in Schichtsystemen mit Grenzflächenaustauschkopplung nach dem Beschuss mit keV-Heliumionen
(2018-03-21)
Magnetische Schichtsysteme mit Grenzflächenaustauschkopplung sind in ihrer Art dahingehend einzigartig, dass sie unter bestimmten Bedingungen nur eine einzige präferierte Orientierung der remanenten Magnetisierung aufweisen, das heißt, dass die Ausrichtung ihrer Magnetisierung in Abwesenheit eines externen Magnetfeldes eindeutig definiert ist. Hervorgerufen wird dies durch die Austauschkopplung einer dünnen ferromagnetischen mit einer dünnen antiferromagnetischen Schicht, wodurch der sogenannte exchange-bias-Effekt ...
Dissertation
Laser amplification in excited dielectrics
(2018-02-12)
Today, laser processing of dielectric materials with ultrashort, femtosecond laser pulses finds a great variety of applications. While ablation, cutting or welding of different types of glasses are widespread and popular examples, nanostructuring of transparent crystals or optoporating cells is part of more recent scientific studies. Although the material systems seem to be very different, their interaction with visible and infrared wavelengths is very similar: the light is simply transmitted. This changes drastically ...
Dissertation
Theory of Vesicle Motion and Interpretation of Electrophysiological Experiments in Chromaffin Cells, Hippocampal Neurons and Neuromuscular Junctions
(2018-07-16)
Communication among secretory cells, neurons and other related cells is accompanied by a
process called exocytosis, which consists in the release of neurotransmitters into the intercellular space. The neurotransmitter molecules are transported inside vesicles, which move
towards the cell membrane. Once at an active site of the membrane, vesicles can undergo
fusion with the membrane. As a result of fusion, a pore in the membrane is produced, through
which neurotransmitter molecules leave the cell. Exocytosis is ...
Dissertation
Influence of Calcium Aluminate Cement and Ground Granulated Blast Furnace Slag on the Synthesis of Rice Husk Ash-Based Geopolymer Mortars
(2018-02-26)
The manufacture of Portland cement is energy intensive and is associated with carbon dioxide emission of approximately 7% of total global emission. The process also produces pollution in the forms of dust, noise, and vibration with operating machinery during blasting in quarries. Geopolymer material is formed through the reaction of silica and alumina oxides with alkali activator and has appeared as a viable alternative to the Portland cement in the construction field due to good properties such as high compressive, ...
Dissertation
Climate Change Impact Assessment of Basin-scale Water Allocation and Management in the Karkheh River Basin, Iran
(2018-09-21)
Hydrological research is intended to improve our understanding of hydrologic processes, the role of hydrological systems in providing water for ecosystems and society, and of the water cycle in the functioning of the earth system. The proper understanding of the hydrology of arid and semi-arid regions is becoming increasingly important, due to diminishing projections of water resource availability in response to global environmental changes. The main objective of this thesis study is to investigate the development ...
Dissertation
HACCP in Germany and Lebanon
(2018-10-22)
Food borne outbreaks have been on the rise in Lebanon and in Germany in recent years. Food safety systems have been developed over a period of years starting from HACCP which was established in the 1950’s unto the European directive 93/43/EEC established in 1993, to directive (EC) No 178/2002 until today in order to prevent and control hazards in the different food safety fields. Such systems which started with HACCP (hazard analysis and critical control point) and was later integrated into private systems such as ...
Dissertation
Nachhaltige Nutzung biogener Haushaltsabfälle durch die aerobe Behandlung von getrennt gesammelten biogenen Abfallstoffen und die Anwendung von Kompost in der Landwirtschaft im Südkaukasus
(2018-02-06)
Nachhaltige Nutzung biogener Haushaltsabfälle durch die aerobe Behandlung von getrennt gesammelten biogenen Abfallstoffen und die Anwendung von Kompost in der Landwirtschaft im Südkaukasus
Dissertation: Nikolas Zöller, im Fachbereich 11, Ökologische Agrarwissenschaften der Universität Kassel Zusammen mit den Projektpartnern (Armenian National Agrarian University und Agricultural Agrarian University of Georgia) wurden in ausgewählten Kleinstädten mit unterschiedlicher Siedlungsstruktur ...
Dissertation
Factors influencing the purchase behaviour of consumers for organic wine: An analysis of household panel data
(2018-07-19)
Consumer studies based on surveys and purchase experiments show positive attitudes towards organic wine in large consumer segments. However, the market share of organic wine is still small. Apparently, there is a gap between consumer attitudes and real purchase behaviour but no study so far analysed this attitude-behaviour relation in a real market context. Therefore, the present dissertation is based on real market data – household panel data of the GfK (Gesellschaft für Konsumforschung).
The study revealed low ...
Dissertation
Potentials and limits of sustainability communication - The cases of climate-friendly food and farmed fish
(2018-02-15)
The present thesis focuses on the potentials and limits of sustainability communication via media, labels and claims to foster the consumption of climate-friendly food and sustainably farmed fish. A mixed methods approach combining an online survey containing choice experiments with qualitative face-to-face interviews was applied to explore consumers’ perceptions of climate-friendly food as well as the limits and merits of a carbon footprint label for fostering climate-friendly consumption. The qualitative approach ...