SUMMARY Buildings and infrastructures characterize the appearance of our cultural landscapes and provide essential services for the human society. However, they inevitably impact the natural environment e.g. by the structural change of habitats. Additionally, they potentially cause further negative environmental impacts due to the release of chemical substances from construction materials. Galvanic anodes and organic coatings regularly used for corrosion protection of steel structures are building materials of particular importance for the transport infrastructure. In direct contact with a water body or indirectly via the runoff after rainfall, numerous chemicals can be released into the environment and pose a risk to aquatic organisms. Up to now, there is no uniform investigation and evaluation approach for the assessment of the environmental compatibility of building products. Furthermore, galvanic anodes and organic coatings pose particular challenges for their ecotoxicological characterization due to their composition. Therefore, the objective of the presented thesis was the ecotoxicological assessment of emissions from galvanic anodes and protective coatings as well as the development of standardized assessment procedures for these materials. The possible environmental hazard posed by the use of anodes on offshore installations was investigated on three trophic levels. To ensure a realistic and reliable evaluation, the experiments were carried out in natural seawater and under natural pH conditions. Moreover, the anode material and its main components zinc and aluminum were exposed while simulating a worst-case scenario. The anode material examined caused a weak inhibition of algae growth; no acute toxicity was observed on the luminescent bacteria and amphipods. However, an increase of aluminum and indium levels in the crustacean species was found. On the basis of these results, no direct threat has been identified for marine organisms from the use of galvanic aluminum anodes. However, an accumulation of metals in crustaceans and a resulting entry into the marine food web cannot be excluded. The environmental compatibility of organic coating systems was exemplarily evaluated using a selection of relevant products based on epoxy resins (EP) and polyurethanes. For this purpose, coated test plates were dynamically leached over 64 days. The eluates obtained were systematically analyzed for their ecotoxicological effects (acute toxicity to algae and luminescent bacteria, mutagenic and estrogenic effects) and their chemical composition. In particular, the EP-based coatings caused significant bacterial toxicity and estrogen-like effects. The continuously released 4-tert-butylphenol was identified as a main contributor to these effects and was quantified in concentrations exceeding the predicted no effect concentration for freshwater in all samples. Interestingly, the overall toxicity was not governed by the content of 4-tert-butylphenol in the products but rather by the release mechanism of this compound from the investigated polymers. This finding indicates that an optimization of the composition can result in the reduction of emissions and thus of environmental impacts - possibly due to a better polymerization of the compounds. Coatings for corrosion protection are exposed to rain, changes in temperature and sun light leading to a weathering of the polymer. To determine the influence of light-induced aging on the ecotoxicity of top coatings, the emissions and associated adverse effects of UV-irradiated and untreated EP-based products were compared. To that end, the investigation of static leachates was focused on estrogenicity and bacterial toxicity, which were detected in the classic microtiter plate format and in combination with thin-layer plates. Both materials examined showed a significant decrease of the ecotoxicological effects after irradiation with a simultaneous reduction of the 4-tert-butylphenol emission. However, bisphenol A and various structural analogues were detected as photolytic degradation products of the polymers, which also contributed to the observed effects. In this context, the identification of bioactive compounds was supported by the successful combination of in-vitro bioassays with chemical analysis by means of an effect-directed analysis. The presented findings provide important information to assess the general suitability of top coatings based on epoxy resins. Within the scope of the present study, an investigation concept was developed and successfully applied to a selection of relevant construction materials. The adaptation of single standard methods allowed an individual evaluation of these products. At the same time, the suitability of the ecotoxicological methods used for the investigation of materials of unknown and complex composition was confirmed and the basis for a systematic assessment of the environmental compatibility of corrosion protection products was created. Against the background of the European Construction Products Regulation, the chosen approach can facilitate the selection of environmentally friendly products and contributes to the optimization of individual formulations by the simple comparison of different building materials e.g. within a product group.

Connected vehicles will have a tremendous impact on tomorrow’s mobility solutions. Such systems will heavily rely on information delivery in time to ensure the functional reliability, security and safety. However, the host-centric communication model of today’s networks questions efficient data dissemination in a scale, especially in networks characterized by a high degree of mobility. The Information-Centric Networking (ICN) paradigm has evolved as a promising candidate for the next generation of network architectures. Based on a loosely coupled communication model, the in-network processing and caching capabilities of ICNs are promising to solve the challenges set by connected vehicular systems. In such networks, a special class of caching strategies which take action by placing a consumer’s anticipated content actively at the right network nodes in time are promising to reduce the data delivery time. This thesis contributes to the research in active placement strategies in information-centric and computation-centric vehicle networks for providing dynamic access to content and computation results. By analyzing different vehicular applications and their requirements, novel caching strategies are developed in order to reduce the time of content retrieval. The caching strategies are compared and evaluated against the state-of-the-art in both extensive simulations as well as real world deployments. The results are showing performance improvements by increasing the content retrieval (availability of specific data increased up to 35% compared to state-of-the-art caching strategies), and reducing the delivery times (roughly double the number of data retrieval from neighboring nodes). However, storing content actively in connected vehicle networks raises questions regarding security and privacy. In the second part of the thesis, an access control framework for information-centric connected vehicles is presented. Finally, open security issues and research directions in executing computations at the edge of connected vehicle networks are presented.

To have a compliant business process of an organization, it is essential to ensure a onsistent process. The measure of checking if a process is consistent or not depends on the business rules of a process. If the process adheres to these business rules, then the process is compliant and efficient. For huge processes, this is quite a challenge. Having an inconsistency in a process can yield very quickly to a non-functional process, and that’s a severe problem for organizations. This thesis presents a novel auditing approach for handling inconsistencies from a post-execution perspective. The tool identifies the run-time inconsistencies and visualizes them in heatmaps. These plots aim to help modelers observe the most problematic constraints and help them make the right remodeling decisions. The modelers assisted with many variables can be set in the tool to see a different representation of heatmaps that help grasp all the perspectives of the problem. The heatmap sort and shows the run-time inconsistency patterns, so that modeler can decide which constraints are highly problematic and should address a re-model. The tool can be applied to real-life data sets in a reasonable run-time.

In Kooperation mit dem TÜV SÜD und 985 Führungskräften aus deutschen Unternehmen wurde erprobt, wie Service-Qualität im Rahmen einer Onlinebefragung gemessen werden kann. Es wurde untersucht, welche Komponenten Service-Qualität umfasst, und ein Rahmenmodell entwickelt, das die Zusammenhänge zwischen Service-Qualität, Kundenzufriedenheit und dem Erfolg von Organisationen beschreibt. Die theoretische Konzeption und Operationalisierung des Konstrukts wurde mittels konfirmatorischer Faktorenanalysen überprüft und bestätigt. Das Rahmenmodell der Studie wurde als Strukturgleichungsmodell formuliert und konnte ebenfalls empirisch bestätigt werden. Die Ergebnisse und deren Auswirkung auf die Weiterentwicklung der bestehenden wissenschaftlichen Theorien zu den Konstrukten Service-Qualität, Kundenzufriedenheit und Erfolg von Organisationen wurden kritisch diskutiert. Zur Steigerung der Ökonomie des Verfahrens wurde ein adaptiver Test zur Erfassung von Service-Qualität entwickelt. Im Rahmen der probabilistischen Testtheorie wurde geprüft, welches Item Response-Modell die empirischen Daten gut beschreiben kann. Als Grundlage für den adaptiven Test wurden die Item-Parameter modellkonform bestimmt. In einer Simulationsstudie wurde untersucht, ob die Ergebnisse der Onlinebefragung sich bedeutsam von den Ergebnissen adaptiver Tests mit unterschiedlichen Konfigurationen unterscheiden. Der Vergleich der Konfigurationen, die sich darin unterschieden, wie der Personenparameter geschätzt wurde und nach welchem Algorithmus das nächste Test-Item gewählt wurde, zeigte, welche Konfigurationen eingesetzt werden können, um eine möglichst geringe Testlänge zu erzielen, ohne dabei bedeutsame Einbußen bei der Reliabilität und Validität der Messung in Kauf zu nehmen. Unter Berücksichtigung dieser Erkenntnisse wurde der Fragebogen zur Erfassung von Service-Qualität als computerbasierter adaptiver Test umgesetzt. Diese neue Erfassungsmethode wurde in der Praxis erprobt, und abschließend wurden Nützlichkeit, Ökonomie und mögliche Nachteile, die mit dieser Art des Testens verknüpft sind, diskutiert. Dieses Dokument, detailierte Analyseergebnisse, den adaptiven Test zur Erfassung von Service-Qualität und weitere Begleitmaterialien finden Sie unter: https://promotion.creaval.de

Satzung zur Festsetzung der Normwerte für den Ausbildungsaufwand (Curricularnormwerte) der Universität Koblenz-Landau Satzung zur Festsetzung von Zulassungszahlen an der Universität Koblenz-Landau – Campus Koblenz für das Studienjahr 2021/2022 Satzung zur Festsetzung von Zulassungszahlen an der Universität Koblenz-Landau – Campus Landau für das Studienjahr 2021/2022 Erste Ordnung zur Änderung der Prüfungsordnung für den Bachelorstudiengang „Psychologie“ des Fachbereichs Psychologie der Universität Koblenz-Landau, Campus Landau Neunte Ordnung zur Änderung der Gemeinsamen Prüfungsordnung für den Bachelorstudiengang und den Masterstudiengang „Psychologie“ des Fachbereichs Psychologie der Universität Koblenz-Landau, Campus Landau

Zweite Ordnung zur Änderung der Rahmenprüfungsordnung der Universität Koblenz-Landau im Zusammenhang mit der SARS-CoV-2 (Corona)-Pandemie

Social media has changed how customers, businesses, employees, and job seekers form their reputation perceptions of a company, that is, how they form their evaluative judgements about a company’s products, services and behaviors towards constituencies. In pre-social media times, companies had control over what they communicated to their stakeholders, for example, by using corporate websites to convey a predefined image. With social media, multiple opinions, experiences, and company perceptions reach the wider public via multiple channels such as Twitter, Facebook, and other social networking sites that enable user-generated content. Although companies usually try to nurture an online reputation by running their own Facebook and Twitter profiles, a large amount of online content related to a company is produced by social media users and thus is beyond companies’ control. This habilitation thesis is devoted to studying consumer and employee responses to employee behavior in social media. Across eight different articles, with multiple studies each, this thesis aims to draw a full picture of how employee behavior in social media affects customers, other employees, job seekers, and the employing company as a whole.

Cultural eutrophication due to excessive inputs of nutrients seriously threatens aquatic ecosystems worldwide and is one of the major anthropogenic stressors on aquatic biota in European rivers. In streams and shallow rivers, its effects include excessive periphyton growth, which causes biological clogging and thereby oxygen depletion in the hyporheic zone. The result is a serious degradation of habitat quality for benthic invertebrates as well as for the eggs and larvae of gravel-spawning fish. Unlike in standing waters, efficient tools for controlling eutrophication in rivers are lacking. However, top-down control of the food-web by manipulating fish stocks, similar to the biomanipulation successfully applied in lakes, offers a promising approach to mitigating the effects of eutrophication in shallow rivers, especially those in which major reductions in nutrient inputs are not feasible. The overall aim of this thesis was to assess the potential for top-down control by two large cypriniform fish, the common nase (Chondrostoma nasus), the only obligate herbivorous fish species in European rivers, and the omnivorous European chub (Squalius cephalus), to mitigate the effects of eutrophication in medium-sized rivers. I therefore conducted field experiments on different spatial and temporal scales in the hyporhithral zone of a eutrophic gravel-bed river. Generally, the results of those experiments revealed the crucial role of fish-mediated top-down effects in river food webs. In a 4-year reach-scale experiment, the key contribution of my thesis, the enhancement of fish densities significantly increased both oxygen availability and water exchange in the upper layer of the hyporheic zone, even though the top-down effects of the fish on periphyton biomass were relatively small. These findings were supported by those of a 4-week mesocosm experiment, which also provided insights into the mechanisms underlying the mitigation of eutrophication effects by nase and chub. The top-down effects of both fish species reduced hyporheic oxygen depletion, suggesting a reduction of biological clogging. The positive effects of herbivorous nase on hyporheic oxygen availability could be attributed to benthic grazing, whereas the reduction of hyporheic oxygen depletion in the presence of omnivorous chub was best explained by the enhanced bioturbation induced by the fish’s benthic foraging. Overall, the results of my thesis demonstrate that biomanipulation achieved by enhancing herbivorous and omnivorous fish stocks can mitigate the effects of eutrophication in medium-sized European rivers. The results may be the first step towards the establishment of biomanipulation as a supportive management tool for eutrophication control in running waters and therefore as a strategy to preserve aquatic biodiversity.

Vertebrate biodiversity is rapidly decreasing worldwide with amphibians being the most endangered vertebrate group. In the EU, 21 of 89 amphibian species are recognized as being endangered. The intensively used European agricultural landscape is one of the major causes for these declines. As agriculture represents an essential habitat for amphibians, exposure to pesticides can have adverse effects on amphibian populations. Currently, the European risk assessment of pesticides for vertebrates requires specific approaches for fish regarding aquatic vertebrate toxicity and birds as well as mammals for terrestrial vertebrate toxicity but does not address the unique characteristics of amphibians. Therefore, the overall goal of this thesis was to investigate the ecotoxicological effects of pesticides on Central European anuran amphibians. For this, effects on aquatic and terrestrial amphibian life stages as well as on reproduction were investigated. Then, in anticipation of a risk assessment of pesticides for amphibians, this thesis discussed potential regulatory risk assessment approaches. For the investigated pesticides and amphibian species, it was observed that the acute aquatic toxicity of pesticides can be addressed using the existing aquatic risk assessment approach based on fish toxicity data. However, lethal as well as sublethal effects were observed in terrestrial juveniles after dermal exposure to environmentally realistic pesticide concentrations, which cannot be covered using an existing risk assessment approach. Therefore, pesticides should also be evaluated for potential terrestrial toxicity using risk assessment tools before approval. Additionally, effects of co-formulants and adjuvants of pesticides need specific consideration in a future risk assessment as they can increase toxicity of pesticides to aquatic and terrestrial amphibian stages. The chronic duration of combined aquatic and terrestrial exposure was shown to affect amphibian reproduction. Currently, such effects cannot be captured by the existing risk assessment as data involving field scenarios analysing effects of multiple pesticides on amphibian reproduction are too rare to allow comparison to data of other terrestrial vertebrates such as birds and mammals. In the light of these findings, future research should not only address acute and lethal effects, but also chronic and sublethal effects on a population level. As pesticide exposure can adversely affect amphibian populations, their application should be considered even more carefully to avoid further amphibian declines. Overall, this thesis emphasizes the urgent need for a protective pesticide risk assessment for amphibians to preserve and promote stable amphibian populations in agricultural landscapes.

Das Bulletin Esskulturen ist aus dem Verbundprojekt „Esskulturen. Objekte, Praktiken, Semantiken“ hervorgegangen, das im Rahmen der Förderlinie „Sprache der Objekte“ von September 2018 bis August 2021 vom Bundesministerium für Bildung und Forschung finanziert wird. In jeder Ausgabe bildet ein Objekt der Stiftung Bürgerliche Wohnkultur, Sammlung Alex Poignard (Landesmuseum Koblenz) den Ausgangspunkt für eine interdisziplinäre Auseinandersetzung mit unterschiedlichen soziokulturellen Fragen rund um das Thema Essen. Mahl-Zeiten. Chronometrie und Störung, Bulletin Esskulturen, 3. Jahrgang 2021, Mappe VI, Faszikel 31-36 Inhalt der Ausgabe Eva Schneider, Mahlzeiten und Chronometrie. Eine chinoise Konsolenuhr aus der Sammlung Poignard Ina Tanita Burda, Stillen – Zeit – Essen. Mahl-Zeiten zwischen Struktur und Störung Martina Weingärtner, Von Spontaneität, Freigiebigkeit und Anerkennung. Genesis 18 als Bild einer außergewöhnlichen Tischgemeinschaft Marion Steinicke, Die Zeit, die Uhren und die Speisen des Kaisers. Nachrichten aus dem Reich der Mitte Nicole Hoffmann, La durée poignardée. Aus der europäischen Lerngeschichte der getakteten Mahl-Zeit Kulinarisches Kino. Andreas Ackermann im online-Gespräch mit Thomas Struck Impressum