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This research aims at evaluating the use of drone (UAV) imagery in the monitoring of hydromorphological changes in a segment of Erft River in Neuss-Gnadental, which has undergone restoration. In four flight campaigns from February 2022 to November 2023, UAV images were processed with open-source photogrammetry and point clouds processing software (WebODM and CloudCompare) to create 2D orthophotos and 3D point clouds. These products supported delineation of the channel and calculation of geometric properties such as the length, sinuosity, and number of meanders which indicated good correspondence with restoration design objectives and continuous morphological changes like erosion, sediment bars, and woody debris.
Hydromorphological quality at the segment scale was assessed by employing an adapted LAWA protocol using only the 2D orthomosaics and 3D point clouds. Analysis showed that restoration of the river segment produced improvements in characteristics such as flow variety, substrate type, and banks while the near “technical” parts of the segment experienced small alterations. The UAV flights were conducted frequently, enabling documentation of seasonal fluctuations that might not have been observed if the surveys had been carried out using satellite imagery.
Certain advantages included centimetre-resolution imagery, flexibility in flight schedules, and visuals friendly to stakeholder impact. Nevertheless, there were specific workflow challenges. Utilising photogrammetry on open-source tools had high computational costs and required hands-on troubleshooting. Vegetation overshadows complicated semi-automated classification routines and requires manual refinement for reliable channel delineation. However, the approach proved effective for high-resolution, local-to-reach-scale monitoring, strengthening adaptive, data-driven management of river restoration sites.
Subsequent campaigns should include data from multiple sensors (LiDAR, multispectral), the inclusion of classification algorithms, and longer, repeated surveys to evaluate the hydromorphological characteristics under different flow conditions. In summary, UAV imagery enhances hydromorphological monitoring and provides a powerful yet still-developing tool for science-based evaluation of restoration efforts.
This thesis aims to contribute to the development of true cost accounting as a comprehensive approach to assessing the externalities of production systems. The research focuses on understanding the opportunities and limitations of its application, while providing science-based evidence to support advocacy for policies that promote more sustainable food systems. This is achieved through a methodological triangulation approach and a case study in Bolivia which is conducted to compare the impacts of large- and small-scale food systems. The thesis begins with a literature review and is complemented by a series of interviews with Bolivian researchers and international experts, as well as a systematic review of scientific articles and reports on TCA. The results show that while there are opportunities to overcome the limitations faced by the Bolivian researchers, there is a lack of knowledge on limitations experienced by other researchers and the solutions they found to address them. This information would be helpful for researchers and other stakeholders interested in TCA research. More research is needed to improve the tools and methods withing the TCA approach and its consideration in political decision making and development issues.
The small Croatian island Lopud is home to three large churches, all built in close succession during the heyday of the Dubrovnik Republic (Ragusa) and during the island's strongest economic period in the 15th century, a tremendous feat of construction for such a modest, sparsely populated island. Several lavishly carved, gilded and painted retables still adorn the interiors today, preserved largely untouched but in a fragile condition.
The Cologne Institute of Conservation Sciences (CICS) at the Technical University of Cologne and the island authorities have been in close contact since 1987. Since then, groups of students and their lecturers have been visiting the island annually over the summer term break to work on projects aimed at restoring endangered works of art.
Conservation/restoration work on the large retable in St Nicholas’ Church began in 1997 and was completed in 2001 with its re-erection.
In 2002, the project, which until then had been exclusively Cologne-based, was transformed into the International Conservation Workshop Lopud (ICWL), a partnership between the universities of Antwerp, Brussels, Split, Dubrovnik and Cologne. From then until 2023, a further 4 retables as well as historical furniture from the churches were restored in annual two-week summer schools.
This publication summarizes the results of more than 20 years of cooperation of the authors within the International Conservation Workshop Lopud ICWL with the focus on the treated retables. Investigation results, treatment concepts and realized treatment steps are described in detail. For further information please visit https://icwl.de/
Assessing and enhancing the cooling potential of urban green infrastructure in Cologne, Germany
(2025)
With the increasing threats of climate change and the associated rise in climate extremes and natural hazards, there has been a growing focus on studies addressing mitigation and adaptation strategies for these hazards, one of which is urban heat islands (UHI). The strategies for mitigating UHI are well-established, with urban green infrastructure being one of the most effective approaches. Previous research has shown that green infrastructure can significantly reduce urban temperatures, although its effectiveness varies depending on specific properties. The cooling effectiveness of these infrastructures differs based on various factors.This paper investigates the cooling potential of various types of green infrastructure, including trees, green roofs, and vertical greenery, in a 16-ha area in Cologne's Volksgarten quarter, based on their biophysical properties. The primary objective was to develop a criteria set for green infrastructure characteristics that enhance cooling potential and climate resilience and to apply this set in assessing the area’s cooling potential. A mixed-methods approach was employed, incorporating literature analysis to define the criteria sets, alongside spatial analysis, in-situ observations, and transpiration modelling to evaluate the study area’s actual cooling potential. The results indicated that, particularly for trees, shading properties based on ecological characteristics such as LAI, height, and crown width play a significant role. For green roofs and vertical greenery, system type characteristics and orientation are potentially more influential. The analysis also included the number of existing infrastructures and based on evaluations of these groups and their locations within the study area, it was possible to identify so-called “cool” and “hot spots” in the study area. The study concludes that while current green infrastructure implementations in the study area have medium cooling potential, there are also clear opportunities for improvement. From these findings, a targeted set of recommendations was drafted to not only enhance cooling potential and climate resistance but also to incorporate additional co-benefits, where specifically for trees, it was possible to make such recommendations even on the species level. This study offers a novel approach to evaluating mitigation strategies, contributing to a deeper understanding of the role of green infrastructure in urban climate resilience, and providing an approach to optimising its benefits with potential implications for urban planners.
Gaming the Metaverse
(2025)
Neal Stephenson’s 1992 novel Snow Crash conceived of the Metaverse as an escapist medium within a dystopian future. By the early 2000s, his vision had evolved into a blueprint for pioneering virtual worlds, notably Second Life. In the 2010s, technology companies—from Meta to Epic Games—recast the Metaverse as the next frontier of digital experience and revenue generation. Now, in the 2020s, the still speculative concept encompasses a convergence of extended reality technologies alongside blockchain systems and artificial intelligence. The contributors bring together leading scholars and industry professionals to examine past “imaginations” and recent “achievements” in the pursuit of the Metaverse. They trace its development through literary, media, and cultural history while exploring current applications and their technical, social, cultural, and economic implications.
Konsens verbreitet sich in den letzten Jahren nicht nur in feministischen, sondern auch in gesamtge-sellschaftlichen Diskursen. Prävalent sind dabei Konsenskonzepte mit den Slogans „Ja heißt Ja“ und „Nein heißt Nein“. Gerade im Zusammenhang mit sexualisierter Gewalt wird Konsens immer wieder zugeschrieben, sowohl sexuelle Gewalt verhindern als auch die Qualität sexueller Interaktionen ver-bessern zu können. Doch kann Konsens diese Erwartungen erfüllen?
Diese Arbeit analysiert die Potenziale und Limitierungen für die Prävention von sexualisierter Gewalt. Dabei wird eine machttheoretische und intersektionale Perspektive angewandt. Konsens wird im Kontext von verbreiteten Vergewaltigungsmythen, Täter*innennarrativen und verwobenen Macht-strukturen betrachtet und nach den Ebenen Motivation, Wille und Kommunikation differenziert ana-lysiert. Es wird herausgearbeitet, inwiefern aktuelle Konsenskonzepte zur Stabilisierung von Macht-strukturen beitragen können, anstelle sie zu dekonstruieren.
Die Analyse gelangt zu dem Ergebnis, dass Konsens weder unmittelbar sexualisierte Gewalt zwischen zwei Menschen verhindern kann, noch ein Ideal für sexuelle Interaktionen darstellt. Langfristig kann Konsens dennoch zu einem Kulturwandel beitragen und dabei unterstützen, Rape Culture, welche sexualisierte Gewalt ermöglicht und fördert, abzubauen.
Die Thesis mündet in der Vorstellung eines neu entwickelten Konsensmodells. Dieses ermöglicht es, sexuelle Handlungen differenziert theoretisch zu analysieren. Es kann zudem genutzt werden, um Präventionsprojekte zu reflektieren und (weiter) zu entwickeln.
Das dieser Veröffentlichung zugrunde liegende Forschungsvorhaben Balancierung von Wissenschaft und Pflege BAWIP wurde von der Universität Göttingen/ Stabsstelle Chancengleichheit und Diversität beauftragt und aus Mitteln des Professorinnenprogramms III des Bundes und der Länder finanziert. Das Projekt wurde unter der Leitung von Prof. Dr. Inken Lind, TH Köln, in Kooperation mit der Stabsstelle von 2021 bis 2023 unter Mitarbeit der Wissenschaftlichen Hilfskräfte Julia Hey und Merle Boedler durchgeführt.
Whether readers are teaching service design in higher education or practicing it in the public sector, this publication provides critical insights and tools for successful service design collaborations. Often, university collaborations - and especially student projects - are the entry point for integrating service design into the public sector, and thus the gateway to citizen-centered, co-creative, innovation-driven change in the public sector. This publication and the associated Miroverse Toolbox will help service design partners to critically reflect on the value of these collaborations and to develop clear recommendations and tools for success.
This research focuses on evolving market conditions in the reinsurance sector and the question of whether an economic downturn triggered by geopolitical tensions in certain countries leads to a market change (capacity decline) in reinsurance. Jörg Dirks works full-time as Senior Manager in the field of ‘Retrocession & Capital Markets’ at Hannover Rück SE.
Der Fokus dieser Forschungsarbeit wird dabei auf die sich verändernden Marktbedingungen im Rückversicherungssektor gelegt und auf die Frage, ob ein konjunktureller Abschwung ausgelöst durch geopolitische Spannungen in bestimmten Ländern zu einer Marktveränderung (Kapazitätsrückgang) in der Rückversicherung führt. Hauptberuflich ist Jörg Dirks bei der Hannover Rück SE als Senior Manager im Bereich "Retrozession & Capital Markets" tätig.