Simplified Flow and Reactive Transport Modeling to Support Decision-Making about Water Management Strategies

In the Indian metropolis of Delhi, the Yamuna River is highly influenced by sewage water, which has led to elevated ammonium (NH4+) concentrations up to 20 mg/L in the river water during 2012–2013. Large drinking water production wells located in the alluvial aquifer draw high shares of bank filtrate. Due to the infiltrating river water, the raw water NH4+ concentrations in some wells exceed the threshold value of 0.5 mg/L ammonia-N of the Indian drinking water specifications, making the water unfit for human consumption without prior treatment. However, to meet the city’s growing water demand, it might be advantageous to consider the long-term use of the well field. This requires the development of an adapted post-treatment unit in concert with an adjusted well field management. To better understand the groundwater dynamics and contamination and decontamination times at the well field, a theoretical modeling study has been conducted. The results of 2D numerical modeling reveal that the groundwater flux beneath the river is negligible because of the aquifer and river geometry, indicating that infiltrating river water is not diluted by the ambient groundwater. Increasing the water abstraction in the wells closest to the river would result in a larger share of bank filtrate and a decreasing groundwater table decline. Simplified 1D reactive transport models set up for a distance of 500 m (transect from the riverbank to the first production well) showed that the NH4+ contamination will prevail for the coming decades. Different lithological units of the aquifer (sand and kankar—a sediment containing calcareous nodules) have a strong influence on the respective contamination and decontamination periods, as the retardation of NH4+ is higher in the kankar than in the sand layer. Although this simplified approach does not allow for a quantification of processes, it can support decision-making about a possible future use of the well field and point to associated research needs

Dispositive der Transformation

In Zeiten von Globalisierung und Digitalisierung ist die Auseinandersetzung mit Prozessen der Transformation in den Künsten von besonderer Relevanz; denn ihre kreativen Köpfe avancieren zu entscheidenden Akteuren des Wandels. Die Herausgeber und Beiträger dieser Publikation beschäftigen sich sowohl theoretisch als auch anhand konkreter Fallbeispiele mit dem Gegenstand der Transformation am Beispiel kultureller Praktiken und künstlerischer Prozesse. Es geht um Europa, Deutschland und Frankreich, es geht um Theater und Film, um Kulturinnen- und Kulturaußenpolitik, vor allem geht es um Entwicklungen einer zivilgesellschaftlichen Selbstverständigung über kulturelle Vielfalt. Die Universität Hildesheim und die Aix-Marseille Université kooperieren dank der Förderung durch die Deutsch-Französische Hochschule seit 2001 mit der Einrichtung eines gemeinsamen deutsch-französischen Studiengangs in „Kulturvermittlung / Médiation culturelle des arts“, der seit 2013 durch die Einrichtung eines deutsch-französischen Promotionskollegs ergänzt wird.A l’heure de la mondialisation et de la digitalisation, la prise en compte des processus de transformation dans les arts est d’une pertinence toute particulière, les créatifs assumant le rôle d’acteur décisif du changement. Les contributeurs et éditeurs de cette publication se penchent, à la fois dans la théorie et par des cas d’étude concrets, sur l’objet que constitue la transformation en s’appuyant sur l’exemple des pratiques culturelles et des processus artistiques. Il s’agit de l’Europe, de l’Allemagne et de la France, il s’agit de théâtre et de fi lm, de politiques culturelles intérieures et étrangères, et il s’agit avant tout du développement d’une connaissance de la société civile sur elle-même dans le domaine de la diversité culturelle. L’Université d’Hildesheim et l’Aix-Marseille Université coopèrent depuis la création d’une fi lière universitaire franco-allemande de « Kulturvermittlung / Médiation culturelle des arts » et grâce au soutien de l’Université franco-allemande depuis 2001. En 2013, cette formation a été complétée par la création d’une école doctorale

Anthropogenic and geogenic influences on peri-urban aquifers in semi-arid regions: insights from a case study in northeast Jaipur, Rajasthan, India

Rapid urbanization has exerted considerable pressure on groundwater resources in Jaipur, India. Peri-urban areas are particularly affected as the public supply infrastructure often does not reach this fast-growing fringe, which often lacks a planning strategy, leading to an informal water supply based on groundwater. At the same time, the hills and historic reservoirs located in these areas are important for groundwater recharge and, therefore, critical for sustainable groundwater-resource management. To understand the local hydrogeology and the role of anthropogenic influences, a 2-year field study was carried out in northeastern Jaipur. The aim was to develop a conceptual model on which a management concept can be built. The study comprised hydrochemical and stable isotope analyses of water samples, depth-to-water measurements, a leveling survey and geophysical investigations. The study revealed that the groundwater from both the Proterozoic hard rock and the overlying Quaternary alluvial aquifer generally does not meet the Indian drinking water thresholds for nitrate concentration and/or total dissolved solids (TDS). While anthropogenic activities are the main source of quantity problems (declining groundwater levels through overabstraction), the biggest quality problems (nitrate up to 550 mg/L and TDS >500 mg/L) are most likely of geogenic origin and only enhanced by anthropogenic impacts. Quantity and quality aspects improve significantly in areas influenced by recharge from the historic reservoirs, leading to the conclusion that artificial recharge structures may be the way forward to improving community water supply and that groundwater protection should be given priority in these areas

Forschungswerkstatt FLEx

Die Forschungswerkstatt FLEx ist eine interdisziplinäre Einrichtung am Zentrum für Hochschuldbildung und möchte Studierenden Unterstütztung bei ihren Forschungsvorhaben bieten. In dieser Dokumentation wird die Entwicklung der Werkstatt über die ersten drei Semester dargestellt

Austrian Students’ Perceptions of Social Distancing and Their Emotional Experiences During Distance Learning Due to the COVID-19 Pandemic

The COVID-19 pandemic has led to far-reaching changes in various aspects of students’ lives. In the particular case of the educational field, classroom teaching was drastically shifted to a distance learning format. Consequently, students needed to deal with a completely different everyday school life. Learning was carried out online, which implied that students could not see some of their regular, important social contacts such as teachers, classmates or friends. It is already proven that such social distancing measures had impacts on students’ emotional experiences during the lockdown. Following a mixed-methods concurrent single-phase design, this study examined students’ perceptions of social distancing and their emotional experiences during the first school lockdown in Austria. Data from an online survey (n = 263 students) and from qualitative interviews (n = 56 students) were analyzed. The results show that distance learning drastically reduced interaction among students and between students and their teachers. Furthermore, the results indicate negative emotional experiences due to less social contact, increased learning pressures, and less structure. However, findings revealed that students also experience and perceived positive emotional experiences during distance learning because of more freedom, autonomy, and to some extent, less performance pressure. Based on the findings, the present study discusses possible perspectives on how to support students during and after distance learning, as well as further lines of research.Peer Reviewe

Observed and personally experienced discrimination: findings of a cross-sectional survey of physicians and nursing staff

Background: Discrimination against hospital staff based on ascribed features is prevalent in healthcare systems worldwide. Detrimental effects on health and quality of patient care have been shown. Our study aims to describe and analyse the discrimination experiences of both physicians and nurses, specifically for the German hospital context. Methods: A cross-sectional online survey on observed and personally experienced discrimination at work addressed staff from 22 hospitals of two organizations in Germany. Sociodemographic and occupational as well as institutional characteristics served as independent variables. In multivariable analyses, block- and stepwise logistic regressions were calculated for the two dependent variables (witness and victim of discrimination). Sensitivity analyses with imputed data for missings were performed. Results: N = 800 healthcare professionals (n = 243 physicians, n = 557 nurses; response rate: 5.9%) participated in the survey. 305 respondents (38.1%) were witnesses of discrimination, while 108 respondents (13.5%) were victims of discrimination in their wards. Reasons for observed discriminatory acts were predominantly attributed to the ethnicity of the person concerned, their appearance and language, whereas personally affected staff most frequently cited gender as a reason, followed by ethnicity, and physical appearance. In multivariable models, cultural competence significantly increased the likelihood of witnessing discrimination (beta = .575; p = .037). In terms of the likelihood of being a victim of discrimination, in addition to cultural competence (beta = 2.838; p = < .001), the interaction of the effects of gender and professional group was statistically significant (beta = .280; p = .010). Conclusions: Given the extent of experienced and observed discrimination, appropriate institutional responses are needed. Further research on discriminatory structures in the German-speaking health care system should focus on discrimination at the intersection of ethnicity, gender and occupation

The Nma1 protein promotes long distance transport mediated by early endosomes in Ustilago maydis

Early endosomes (EEs) are part of the endocytic transport pathway and resemble the earliest class of transport vesicles between the internalization of extracellular material, their cellular distribution or vacuolar degradation. In filamentous fungi, EEs fulfill important functions in long distance transport of cargoes as mRNAs, ribosomes, and peroxisomes. Formation and maturation of early endosomes is controlled by the specific membrane-bound Rab-GTPase Rab5 and tethering complexes as CORVET (class C core vacuole/endosome tethering). In the basidiomycete Ustilago maydis, Rab5a is the prominent GTPase to recruit CORVET to EEs; in rab5a deletion strains, this function is maintained by the second EE-associated GTPase Rab5b. The tethering- and core-subunits of CORVET are essential, buttressing a central role for EE transport in U. maydis. The function of EEs in long distance transport is supported by the Nma1 protein that interacts with the Vps3 subunit of CORVET. The interaction stabilizes the binding of Vps3 to the CORVET core complex that is recruited to Rab5a via Vps8. Deletion of nma1 leads to a significantly reduced number of EEs, and an increased conversion rate of EEs to late endosomes. Thus, Nma1 modulates the lifespan of EEs to ensure their availability for the various long distance transport processes