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Dissertation
Untersuchungen zur Entwicklung einer wassersparenden Methode für die streifenförmige Beregnung von Dammkulturen im Feldgemüsebau
(2019-04)
Im Freilandgemüsebau der gemäßigten Klimazone Europas erhöhen Witterungsunsicherheiten und Trockenstress im Frühjahr und Sommer das Risiko für Ernteeinbußen und –ausfälle. Insbesondere bei im Dammanbau dicht unter der Oberfläche der Dammkrone gesäten Kulturen, wie beispielsweise der Möhre, besteht bei trockener Witterung die Gefahr eines ungleichmäßigen und verzögerten Auflaufens mit Folgen für die Bestandsentwicklung. Eine boden- und pflanzenschonende Beregnung der Dammkrone, die genügend pflanzenverfügbares Wasser ...
Aufsatz
Physical and chemical optimisation of the seedball technology addressing pearl millet under Sahelian conditions
(Kassel University Press, 2019-01-16)
This study deals with the development of the seedball technology in particular for dry sowing under Sahelian conditions and pearl millet as crop. At first, our participatory evaluation in Senegal showed that (i) local materials needed for seedball production are locally available, (ii) the technology conforms to the existing management systems in the Sahel, and (iii) socio-economic conditions do not hinder seedball adoption. Afterwards, seedball was mechanically and chemically optimised. Pearl millet seedlings derived ...
Aufsatz
Biofuels and livelihoods: Empirical findings on the welfare impacts of Jatropha cultivation in the Mangochi district, Southern Malawi
(2019-11-27)
This study evaluates the welfare impacts of jatropha (Jatropha carcus) cultivation measured as consumption expenditure per adult-equivalent for smallholders in southern Malawi. Household survey data from the southern region of Malawi collected in 2014 from 303 smallholders using purposive and random selection strategies were used. Propensity score matching and endogenous switching regression methods were employed to address the selection bias problem and to control for observed and unobserved covariate effects. The ...
Aufsatz
What climate-smart agriculture means to members of the Global Alliance for climate-smart agriculture
(Section Specialized Partnerships in Sustainable Food Systems and Food Sovereignty at the University of Kassel, Germany and Federation of German Scientists (VDW), 2019-06-05)
Climate-smart agriculture (CSA) is a recently proposed solution to address increasing concerns about food scarcity caused by climate change. The UN Food and Agriculture Organization defines CSA as an increase in agricultural productivity while adapting and building resilience to climate change and reducing greenhouse gas emissions, where possible. However, this definition of CSA and relevant methods are central to a debate between different groups of stakeholders, such as NGOs, policy-makers in developed and developing ...
Buch
Erlebnisführer Dönche
(Universität Kassel, Fachbereich Architektur Stadtplanung Landschaftsplanung, Fachgebiet Landschafts- und Vegetationsökologie, 2019)
Mit dem wachsenden Umweltbewusstsein zeichnet sich ein neuer Trend ab: Die Natur ist nicht mehr allein um ihrer selbst willen schützens- und erhaltenswert, sondern auch als Ort der Ruhe und der Naturerfahrung. Vor allem stadtnahe Naturerfahrungsräume rücken zusehends in den Blickpunkt der Öffentlichkeit, da sie für jedermann schnell und unproblematisch erreichbar sind. Spannende Ausflüge mit der Familie oder mit Kinder- und Jugendgruppen sind einfach zu verwirklichen. Die Dönche mit ihrer Lage unmittelbar vor den ...
Konferenzveröffentlichung
The Influence of different die geometries on the Extrusion Process of High-Consistency Silicone Rubber
(Society of Plastics Engineers, 2019)
Silicone Rubber and especially High-Consistency Silicone Rubber (=HCR), are typically processed in the extrusion process. Due to the high requirements in terms of the ma-terial properties and the geometric dimensions, a funda-mental knowledge of the whole process including experi-ences in tool design are essential.
In this study, HCR with different Shore-hardnesses are extruded on a vertical silicone extrusion line with various breaker plates with different length to diameter ratios (=L/D-ratio) in order to analyze ...
Konferenzveröffentlichung
Natural fiber reinforced technical (bio-) composites modified with halogen-free flame retardants
(Society of Plastics Engineers, 2019)
Under the aspect of sustainability and the use of alternative materials, engineering thermoplastics such as polybutylene terephthalate (PBT) will be reinforced with renewable raw materials such as regenerated cellulose fibers.
The University of Kassel is developing cellulose regenerated fiber reinforced technical thermoplastics in a state-funded project with further companies. Since pure natural fibers cannot withstand the high operating temperature of engineering thermoplastics (Ts>230°C), regenerated cellulose ...
Rezension
Book Review: Zienkowski, J. (2017). Articulations of self and politics in activist discourse: A discourse analysis of critical subjectivities in minority debates. Cham: Palgrave Macmillan/Springer Nature. xix + 451pp.
(2019-03-16)
Rezension von Markus Leibenath zu: Zienkowski, J. (2017). Articulations of self and politics in activist discourse: A discourse analysis of critical subjectivities in minority debates. Cham: Palgrave Macmillan/Springer Nature. xix + 451pp.
Konferenzveröffentlichung
Blending CA with PBS to increase the bonding strength in two-component injection molding
(Society of Plastics Engineers, 2019)
Since CA shows no adhesive properties in the two-component injection molding process with bio based TPU, blends of CA and PBS were produced to decrease the interfacial tension between the materials. While the interfacial tension was calculated from the results of a drop shape analysis, the adhesion strength was measured in peel tests according to the guideline VDI 2019. The comparison of the results gave information about whether the drop shape analysis is a valid method to analyze the adhesive characteristics of ...
Konferenzveröffentlichung
Flexible Foams made of Liquid Silicone Rubber and expandable Microspheres
(2019-10-02)
In this study, the possibility of foaming liquid silicone rubber (LSR) was investigated. The foam was produced by injection molding with two different thermoplastic, expandable microspheres. Different properties were tested using the S2-tensile bar, e.g. density, tensile strength, specific tensile strength, elongation at break, stress at 100 % strain and the hardness. It was found that the two types of microspheres used have similar effects on density, specific tensile strength and elongation at break, but differ in ...