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Aufsatz
Consequences of Deep Rolling at Elevated Temperature on Near-Surface and Fatigue Properties of High-Manganese TWIP Steel X40MnCrAl19-2
(2021-11-05)
Due to pronounced work-hardening induced by the complex interplay of deformation mechanisms such as dislocation slip, twinning and/or martensitic phase transformation, high-manganese steels represent a class of materials well-suited for mechanical surface treatment. In the present study, the fatigue behavior of a high-mangsanese steel showing twinning-induced plasticity (TWIP) effect at room temperature (RT) was investigated after deep rolling at 550 °C. Results are compared to a former study discussing the behavior ...
Aufsatz
Leveraging Biodiversity Action From Plural Values: Transformations of Governance Systems
(2021-06-04)
In this paper, we argue that leveraging plural values into action for biodiversity requires a focus on transforming the biodiversity governance system. We draw on Donella Meadows’ concept of Leverage Points, which outlines the “depth” of intervention in order to shift a system toward sustainability. Engaging with deep leverage points (system intent and goals) is argued to lead to greater transformation than engaging with shallow leverage points (system design and materials). We outline how embracing plural values of ...
Aufsatz
Scaling the impact of sustainability initiatives: a typology of amplification processes
(2020-05-14)
Amplifying the impact of sustainability initiatives to foster transformations in urban and rural contexts, has received increasing attention in resilience, social innovation, and sustainability transitions research. We review the literature on amplification frameworks and propose an integrative typology of eight processes, which aim to increase the impact of such initiatives. The eight amplification processes are: stabilizing, speeding up, growing, replicating, transferring, spreading, scaling up, and scaling deep. ...
Aufsatz
Bridge over troubled water: managing compatibility and conflict among thought collectives in sustainability science
(2021-12-01)
Sustainability transformations call forth new forms and systems of knowledge across society. However, few tools and processes exist for promoting dialogue among different interests and normative stances in knowledge co-creation. In this article, we build on the notion of thought collectives to argue that understanding and moderating normative tensions are necessary if sustainability science is to provide successful solutions. Drawing on an analysis of the normative tensions between rival high-tech and low-tech thought ...
Aufsatz
Antioxidant activity of a mixture of water-soluble tempeh extract with whey powder that has undergone a Maillard reaction
(2021-12-20)
High amino acid content in tempeh and lactose in whey powder can be combined to perform Maillard reaction. So, it can be used to produce functional food products. This is caused by the formation of Amadori and melanoidin as water-soluble compounds which are reported to have high antioxidant capacity and produce a preferred flavor. The general objective of the study was to obtain an optimum process condition in a mixture of water soluble tempeh extract and whey powder with the highest antioxidant capacity (100 mL). ...
Dissertation
Fluoreszenzmikroskopische in-situ-Untersuchungen zu Wechselwirkungen von Fließmitteln und Partikeln in zementären Systemen
(2021)
Effektive rheologiemodifizierende Zusatzmittel sind aus der modernen Betontechnologie nicht mehr wegzudenken. Sei es der wirtschaftlichere, weil schnellere Einbau von fließfähigem Normalbeton oder die Herstellung von hoch- und ultrahochfesten Betonen; die so genannten Fließmittel spielen eine zentrale Rolle beim Einsatz und bei der Entwicklung zeitgemäßer, zementgebundener Baustoffe. Zur detaillierten Untersuchung der Wirkungsmechanismen wurde in dieser Arbeit eine Methode entwickelt, die die Beobachtung der ...
Dissertation
Wie wird die „Wilde Weide“ nicht zum Wald?
(2020)
Das Ziel dieser Dissertation war es, die Auswirkungen einer Beweidung mit Rindern und Pferden auf initiale Sukzessionsprozesse in einem Heidegebiet zu untersuchen. Der Arbeit liegen folgende übergeordnete Fragestellungen zugrunde: 1. Wie wirkt sich die Beweidung auf die Etablierung von typischen Baumarten einer Heidelandschaft aus? 2. Welche Rolle spielt die Intensität der Beweidung dabei? 3. Inwiefern wird die Etablierung der Bäume durch die zunehmende Niederschlagsreduktion im Zuge des Klimawandels beeinflusst? 4. ...
Dissertation
Investigation of drying behavior and color development of beef slices for development of non-invasive monitoring approaches
(2021)
Meat drying has a long tradition worldwide and technically dried meat is increasingly valued as a low-fat snack or high-protein food product. Convection drying is widely used in industrial food preservation and has to provide high process efficiency and high product qualities, which can be contradictory. Therefore, it is important to understand the changes that occur in the product in order to develop drying strategies that consider process and product efficiency each at an acceptable level. The objective of this ...
Dissertation
Optical Amplification in Disordered Waveguiding Systems
(2020)
Bei dem Phänomen der verstärkten Emission in ungeordneten Systemen handelt es sich um ein wiederentdecktes und über die letzten Jahrzehnte stark debattiertes Themengebiet in der Literatur. Diese Dissertation soll hierzu zwei experimentelle Ansätze bieten, wobei beide in der Lage sind, bei optischer Anregung entweder Random Lasing oder Verstärkte Spontane Emission zu zeigen.
In dieser Arbeit wird thermisch induzierte Faltenbildung (Wrinklebildung) als neuer Ansatz zur Herstellung von Streuzentren in wellenleitenden ...
Dissertation
Energy Budget- and Temperature Index- based Calculations of Seasonal Mass Balances and Discharge in the Tropical Glacier Artesonraju and Artesoncocha Basin in the Cordillera Blanca,
Peru
(2020)
The core of the present Doctoral study deals with glacier simulations for calculating mass balance and discharge in the Artesonraju glacier and Artesoncocha basin, in the Cordillera Blanca (CB), Peru. For this purpose, two different models are used. One is an energy-model (EBM) which is physically based and uses energy fluxes measurements on the glaciers, whereas the other one is a temperature index model (TIM) which is empirical and uses mainly temperature and precipitation as its main input data.
An analysis of ...