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Zeitschrift
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Vol. 10 No. 4 (2022)
(Specialized Partnerships in Sustainable Food Systems and Food Sovereignty, Faculty of Organic Agricultural Sciences, the University of Kassel, Germany and the Federation of German Scientists (VDW), 2022-08-31)
Masterarbeit
Simulative Research on a Modified VSM Control Scheme for Respecting DC-Side Active-Power Limitations
(2022)
This thesis presents and examines a novel approach to modify the active-power behaviour of a generic virtual synchronous machine (VSM) in order to respect DC-side active-power limitations of converter-coupled generation and loads, thereby enabling them to participate in instantaneous reserve without hardware reinforcements.
A modification to the VSM control is suggested, which consists of a ∆P feedback loop and a dynamic adaptation of the virtual impedance Xvirt. These mechanisms enable the VSM to have a RoCoF-dependent ...
Aufsatz
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Sustainability Assessment for Asparagus Farms that Work with a Community-Supported Agriculture Model in Turkey
(2022-07-31)
Due to the diversified nature of agricultural systems, it is difficult to handle the sustainability aspects of different farming practices. With an intention to evaluate the sustainability of the community-supported agriculture (CSA) model in Turkey, the current study focuses on asparagus farms and designs farm-specific sustainability indicators that would be helpful for the farmers. The framework developed for this purpose consists of 20 environmental, 8 economic, and 17 social sustainability indicators derived and ...
Aufsatz
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Icing the Cake: A Lifestyle-based Benefit and Preference Analysis on Online Grocery Shopping
(2022-07-31)
Germany has not kept pace with the global development of online grocery shopping (OGS) and despite a pandemic-related increase remains on a moderate level. This phenomenon may reflect infrastructural benefits of stationary retailing, personal and household preferences, and perceptions of OGS services. To this end, this study investigates the determinants of OGS benefit perception addressing the interconnection between personal and household benefits and situational conditions based on qualitative ...
Dissertation
Entwicklung eines Nanospektrometer-Demonstrators für den sichtbaren Spektralbereich
(2022)
Ein miniaturisiertes optisches Spektrometer auf Basis eines Fabry-Pérot-Filter-Arrays wird für den sichtbaren Spektralbereich als Demonstrator realisiert. Hierfür wird ein FP-Filter-Array mit einem optischen Bandpass-Filter in eine Graustufen-CCD-Kamera integriert und ein Algorithmus zur Signalverarbeitung implementiert. Die Kalibrierung des Spektrometers wird experimentell mit Hilfe einer durchstimmbaren Lichtquelle durchgeführt, die in dieser Arbeit konstruiert und verifiziert wird. Die Bezeichnung des Spektrometers ...
Dissertation
Vergleichende phylogeographische und populationsgenetische Untersuchungen an der Pionierbaumgattung Macaranga (Euphorbiaceae) in Sundaland
(2022)
Die vorliegende Arbeit beschäftigt sich mit der Phylogeographie und Populationsgenetik der Pionierbaumgattung Macaranga in Sundaland, einer Region, die die Großen Sundainseln Sumatra, Borneo, Java und die malaiische Halbinsel umfasst. Eine Vielzahl der 300 in dieser Gattung enthaltenen Arten sind Wiederbesiedler gestörter Areale und sind daher in Sekundärwaldstrukturen besonders häufig. Im Rahmen dieser Dissertation wurden Studien in ganz Sundaland zu den sechs Arten M. tanarius (Tanarius-Artengruppe), M. gigantea, ...
Dissertation
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Automatic affective processes toward different types of exercise and physical activity in adults and children
(2022-03)
Taking a closer look at affective responses to exercise- and physical activity (PA)-related stimuli (regardless of whether they are automatic or deliberative in nature) still represents an area of research on exercise or PA motivation that involves many open questions. From this starting point, the central question is, why so many individuals feel uncomfortable while exercising and further, is this perhaps fundamental to why so many people fail to be sufficiently physically active although they know, that it would ...
Rezension
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[Rezension zu:] Katharina N. Piechocki, Cartographic Humanism. The Making of Early Modern Europe, Chicago (The University of Chicago Press) 2019, XII–311 p., 23 b/w fig., ISBN 978-0-226-64118-8, USD 45,00.
(2022-06-29)
Rezension von Ingrid Baumgärtner zu: Katharina N. Piechocki, Cartographic Humanism. The Making of Early Modern Europe, Chicago (The University of Chicago Press) 2019, XII–311 p., 23 b/w fig., ISBN 978-0-226-64118-8, USD 45,00.
Working paper
Natur in der Neuen Suburbanität
(2022-09)
Unter dem Schlagwort Neue Suburbanität werden Siedlungserweiterungen, die einen städtischen Charakter aufweisen sollen, an Stadträndern von Großstädten diskutiert und entworfen. Zugleich wird über Formen der Mensch-Naturbeziehungen auch in Städten diskutiert und sie sollen z. B. hinsichtlich des Klimawandels, der Lebensmittelversorgung, Biodiversität und Pädagogik bei Neubausiedlungen berücksichtigt werden. Daher untersucht diese Studie exemplarisch an neueren Siedlungserweiterungen am Stadtrand Hamburgs, welche ...
Dissertation
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Towards crop communities: exploring wheat diversity, wheat-pea species mixtures and farming practice in a food system context
(2022-06)
This thesis combines experimental work on heterogeneous crop populations (HP) and species mixtures (SM) with a social scientific and participatory approach. Chapter 1 introduces crop communities as a concept to integrate multiple approaches to diversify farming systems. HPs provide intraspecific and SM interspecific diversity in crop communities. A key challenge for the genetic improvement of HPs, especially for root traits is to combine effective selection to improve HPs while maintaining intraspecific diversity. ...