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See detailThe Persistence of Technology: Histories of Repair, Reuse and Disposal
Krebs, Stefan UL; Weber, Heike

Book published by Transcript (2021)

Repair, reuse and disposal are closely interlinked phenomena related to the service lives and persistence of technologies. When technical artefacts become old and worn out, decisions have to be taken: is ... [more ▼]

Repair, reuse and disposal are closely interlinked phenomena related to the service lives and persistence of technologies. When technical artefacts become old and worn out, decisions have to be taken: is it necessary, worthwhile or even possible to maintain and repair, reuse or dismantle them – or must they be discarded? These decisions depend on factors such as the availability of second-hand markets, repair infrastructures and dismantling or disposal facilities. In telling the stories of China's power grid, Canadian telephones, German automobiles and India's shipbreaking business, among others, the contributions in this volume highlight the persistence of technologies and show that maintenance and repair are not obsolete in modern industries and consumer societies. [less ▲]

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See detailFast bases for half-integral weight modular forms
Wiese, Gabor UL

Scientific Conference (2021)

In this joint work with Ilker Inam, we exploit classical results of Kohnen and Cohen to give explicit bases of the spaces of half-integral weight modular forms of level Gamma_0(4) in any weight, which can ... [more ▼]

In this joint work with Ilker Inam, we exploit classical results of Kohnen and Cohen to give explicit bases of the spaces of half-integral weight modular forms of level Gamma_0(4) in any weight, which can be compared to the Miller bases for integral weight modular forms of level 1. They are very simple and can be computed quickly by performing power series multiplications. In further work with Inam et al., we apply them to a computational study of the distribution of signs of such modular forms. [less ▲]

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See detailThe Persistence of Technology: From Maintenance and Repair to Reuse and Disposal
Weber, Heike; Krebs, Stefan UL

in Krebs, Stefan; Weber, Heike (Eds.) The Persistence of Technology: Histories of Repair, Reuse and Disposal (2021)

Heike Weber and Stefan Krebs argue that repair should be discussed from a temporal perspective – one which reaches beyond the timescale of the repair process itself. This includes the historicity of ... [more ▼]

Heike Weber and Stefan Krebs argue that repair should be discussed from a temporal perspective – one which reaches beyond the timescale of the repair process itself. This includes the historicity of repair, i.e. that repair practices and cultures have changed over time and should be investigated in their respective historical contexts. But it reaches beyond historicity and refers to the manifold temporalities included in processes, infrastructures and acts of repair. Maintenance and repair react to the wear and tear that happens over time and they represent interventions with the temporal aim of prolonging the time an object can stay in use. [less ▲]

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See detailA randomized controlled trial of an Internet-based emotion regulation intervention for sexual health: study protocol
Fischer, Vinicius Jobim; Andersson, Gerhard; Billieux, Joel et al

in Trials (2021), 22

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See detailSmartphone-based interventions for physical activity promotion: scoping review of the evidence over the last 10-years.
Domin, Alex UL; Spruijt-Metz, Donna; Theisen, Daniel UL et al

in Journal of Medical Internet Research (2021), 9(7), 24308

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See detailDefining the Pre-Examination Experience of MRI patients through Affective Interaction.
van Weert, Katja; Chen, Tianyi; Verburg, Pepijn et al

Poster (2021)

For many patients, Magnetic Resonance Imaging (MRI) experiences are uncomfortable and associated with high levels of anxiety and stress. Such negative experiences may interfere with image quality and ... [more ▼]

For many patients, Magnetic Resonance Imaging (MRI) experiences are uncomfortable and associated with high levels of anxiety and stress. Such negative experiences may interfere with image quality and increase examination time. It is therefore necessary to understand the mental states of the patients prior to the examination in order to provide stress-relieving measures. Studies exploring MRI-related anxiety and interventions to alleviate it have typically relied on self-reported data (e.g. STAI-6 questionnaire) or psychophysiological measures [1], usually in the waiting room. One could however benefit from an alternative measurement approach to overcome the limitations of current methods. The purpose of our study is to develop a tool for measuring mental states in the context of MRI experiences and explore the suitability of various sensors to detect anxiety. [less ▲]

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See detailRethinking the History of Repair: Repair Cultures and the "Lifespan" of Things
Krebs, Stefan UL; Weber, Heike

in Krebs, Stefan; Weber, Heike (Eds.) The Persistence of Technology: Histories of Repair, Reuse and Disposal (2021)

Stefan Krebs and Heike Weber historicise the concept of "repairing things" with a view to broadening and redefining the emphasis of current debates on repair as a "new social movement" and the emergence ... [more ▼]

Stefan Krebs and Heike Weber historicise the concept of "repairing things" with a view to broadening and redefining the emphasis of current debates on repair as a "new social movement" and the emergence of a "repair society". These current discourses often lack a sense of the long history of repairing things which saw ups and downs in cultures of repair and self-repair. The chapter charts out the heterogeneity and interrelatedness of the actors involved in repair over time. It draws on examples from Western Europe and North America to highlight some important moments in the history of repair, the intrinsic links between professional and DIY repair practices, discourses on the "lifespan" of things, and changing disposal regimes. [less ▲]

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See detailMaintaining the Mobility of Motor Cars: The Case of (West) Germany, 1918–1980
Krebs, Stefan UL

in Krebs, Stefan; Weber, Heike (Eds.) The Persistence of Technology: Histories of Repair, Reuse and Disposal (2021)

Stefan Krebs uses the case of Germany to investigate maintenance and repair as a central part of automobility. The chapter will look at two sides of car repair as the need to maintain the mobility ... [more ▼]

Stefan Krebs uses the case of Germany to investigate maintenance and repair as a central part of automobility. The chapter will look at two sides of car repair as the need to maintain the mobility function and the practice of a hobbyist consumer activity that promised status, community and identity. It highlights four aspects that framed repair as a necessary part of car consumption: the (un-)reliability of automobile technology; the emergence of a car repair infrastructure; repair costs, which determined to a large extent whether one could afford to drive a car; and DIY repair practices. The success and widespread adoption of automobiles as consumer products was closely tied to the availability of affordable repair services, and the emergence of a large-scale car repair infrastructure was a prerequisite for mass motorisation. [less ▲]

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See detailRéformer le droit luxembourgeois
Prüm, André UL

in Mélanges en l'honneur de Pascal Ancel (2021)

Methods and constraints for reforming Luxembourg law

See detailSTUDY OF RESORCINOL FORMALDEHYDE LATEX ADHESIVE IN FLEXIBLE RUBBER COMPOSITES: Multiscale characterization of initial structure and its evolution upon thermal treatment
Enganati, Sachin Kumar UL

Doctoral thesis (2021)

Polymeric cord-rubber composites play a vital role in the performance of a tire. They provide dimensional stability, strength to the sidewall, absorb shock, etc. in the tires. The polymer cords used in ... [more ▼]

Polymeric cord-rubber composites play a vital role in the performance of a tire. They provide dimensional stability, strength to the sidewall, absorb shock, etc. in the tires. The polymer cords used in these composites are dipped in resorcinol–formaldehyde–latex (RFL) adhesive to improve the cord-rubber adhesion. Not enough studies have been performed to fully understand the RFL interfacial region and its structural changes in course of tire usage. Moreover, its detailed structure and its evolution during thermal exposure has not been fully resolved. This study has been dedicated in understanding the structural properties of the RFL interfacial layer and its evolution upon thermal treatment in cord-rubber composites. Firstly, pure RFL adhesive properties were investigated when subjected to accelerated thermal exposure. The DMA and AFM measurements highlighted an increase of the modulus of the latex phase and the resin phase during thermal treatment in the presence of curatives. However, no changes occurred in the latex phase in RFL without curatives samples during thermal treatment. Such results demonstrated that the increase of modulus of the latex phase during thermal treatment was mainly due to the presence of curatives through the co-vulcanization process highlighted by NMR. Then, a model composite system composing RFL dipped polyamide monofilaments embedded in a rubber matrix was developed. A multiscale methodology was implemented to study the RFL interfacial region when the model composite was subjected to thermal treatment. While the macroscopic interfacial adhesion properties decreased with thermal treatment, an increase in the local modulus in RF resin and latex phases of the interfacial region was observed by AFM. The SEM-EDX results indicated the presence of oxygen in the RFL region which was facilitating the resin hardening in the RF phase. The further crosslinking in the latex phase due to the presence of sulfur curatives resulted in the increase of the latex phase modulus. Finally, the developed methodology on the model system was applied to the multifilament tire composites (polyamide cords embedded in rubber matrix) to have a multiscale connection between macroscale adhesion behavior and local RFL interfacial region evolution. [less ▲]

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See detail„Thinkering“ als historischer Erkenntnismodus. Überlegungen zu einer Experimentalisierung der Medienobjektgeschichte
Krebs, Stefan UL; Fickers, Andreas UL

in Dörfling, Christina; Jost, Christofer; Pfleiderer, Martin (Eds.) Musikobjektgeschichten: Populäre Musik und materielle Kultur (2021)

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See detailPartage (socionumérique)
Lukasik, Stéphanie UL

in Publictionnaire. Dictionnaire encyclopédique et critique des publics. (2021)

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See detailOptimization of the Return Link Carrier Planning for a Constant Coding and Modulation Satellite Network
Lacoste, Clément UL; Maturo, Nicola UL; Chatzinotas, Symeon UL et al

in Frontiers in Communications and Networks (2021), 2

In this paper, we propose an approach to optimize the frequency plan and associated bandwidth allocation in the return link of a broadband satellite network, by exploring several design techniques for ... [more ▼]

In this paper, we propose an approach to optimize the frequency plan and associated bandwidth allocation in the return link of a broadband satellite network, by exploring several design techniques for carrier allocation plans. Since bandwidth is a limited resource in satellite telecommunications, the minimization of bandwidth usage is a core issue that satellite communication service providers must solve, in particular for networks using a constant coding and modulation plan, which lacks the flexibility found in newer satellite communication products and can be subject to hardware constraints. This problematic led us to raise the following question: how can the long term bandwidth requirement of the network be minimized, given a set of ground terminals, of Modulations and Codings, and of discrete bandwidths. In this document we formally define the long-term carrier allocation problem and analyze current practical solutions. We subsequently investigate two other potential solutions, found to be more bandwidth-efficient: one based on heuristics and another based on integer linear programming. Finally, we look at the impact of several parameters on the performance of those three methods. Overall we observed marginal reductions in bandwidth, however significant gains were reached for networks with small return links with low committed information rate, a case in which some constant coding and modulation networks could fall. We concluded that those networks could benefit from our methods and see a significant reduction in bandwidth, and subsequently operational costs, at low implementation costs. [less ▲]

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See detailLes réseaux socionumériques : un mirage pour l’érudition
Lukasik, Stéphanie UL

in Hermès la revue (2021), 87

Digital Social Networks : A Mirage for Scholarship Digital social networks constitute a mirage for scholarship. While a necessary condition of scholarly research is the availability of a diverse range of ... [more ▼]

Digital Social Networks : A Mirage for Scholarship Digital social networks constitute a mirage for scholarship. While a necessary condition of scholarly research is the availability of a diverse range of information, using digital social networks to gain access to sources can limit informational plurality. As a result of their homophilous functioning, there is not much interplay of content on social media. In concretizing, on a large scale, both the two-step flow of communication model and the figure of the opinion leader, online social media are platforms within which users-receivers get their information from other members of their own social networks. Receiving information through an opinion leader changes how it is grasped. Without the different facets of a piece of information, it is difficult to attain a scholarly perspective, because this requires in-depth study and a comparison of sources. Only the personal reconstruction of a variety of sources can restore the heterogeneity that scholarship demands. [less ▲]

See detailLa reformulation de la figure du leader d’opinion au prisme de la réception de l’information des jeunes adultes via les réseaux socionumériques
Lukasik, Stéphanie UL

Doctoral thesis (2021)

Social-digital networks are linked to the user-receiver activity theorized by the Columbia school. In their model of two-step flow of communication, the Columbia researchers focused on non-digital social ... [more ▼]

Social-digital networks are linked to the user-receiver activity theorized by the Columbia school. In their model of two-step flow of communication, the Columbia researchers focused on non-digital social networks. The link between the media system and the social system that the Columbia school anticipated seems all the more relevant with the collect of information via social networks. Henceforth, the media must reckon with social networks and consequently with users-receivers. By sharing information, each user-receiver can become a short-term opinion leader by influencing their secondary groups and by arousing gratifications. The one-off act of sharing materializes this new filter which symbolizes the passage to the second step flow of communication. Sharing is therefore the circumstantial reification of personal influence which transforms the user-receiver into an opinion leader. In this 2.0 user-receiver model of the new media digital-social networks ecosystem, 2.0 opinion leaders can be compared to opinion sharers. 2.0 user-receivers are no longer only influenced by discussions led by opinion leaders within the groups to which they belong, but they are also influenced as soon as they receive information on social-digital networks by the filter operated by these same 2.0 opinion leaders. By mobilizing European and North American scientific literature, we wish to show the relevance of a canonical theoretical framework for the analysis of the uses and practices of social-digital networks through the prism of the reception of information from young adults. The goal of our approach is to link information (which is diffused by the media) to the communication of information (by users-receivers). In order to understand the situations of opinion influence at work in circulation and reception activities, the information filter processes will be studied by taking up the structural elements of the model proposed by the Columbia school ; in this model, those are the opinion leaders who are the real relays and filters of information. Our approach, both theoretically and methodologically, is a return to the original Columbia school literature. In accordance with this same literature, we aim to deploy an empirical social analysis steeped in both quantitative and qualitative methodology. We are interested in what "real people of everyday life" choose and do with media on social-digital networks, like the Columbia school which was interested in the people's choice and in particular in the part played by people in the flow of mass communications. The objective of this research is thus to transpose this Columbia model to the context of social-digital networks in order to update it and redefine, within it, the notion of opinion leader whose acceptance has been altered. Our contribution is therefore that of a social analysis of human communication of information via social-digital networks in the human and social sciences. [less ▲]

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See detailExploring the potential of citizen science for more adaptive and sustainable surface water governance in Luxembourg
Pickar, Karl Arthur UL

Doctoral thesis (2021)

The following Ph.D. thesis describes a research project, which aimed to explore the potential of environmental citizen science to contribute to more adaptive surface water governance in Luxembourg and ... [more ▼]

The following Ph.D. thesis describes a research project, which aimed to explore the potential of environmental citizen science to contribute to more adaptive surface water governance in Luxembourg and beyond. Citizen science projects are research projects, which are marked by the active engagement of members of the public. Adaptive governance refers to a type of governance, which is based on the engagement of diverse types of knowledge, perspectives, and stakeholders, and on building adaptive capacity in the face of unforeseen change and coordination across levels and scales. The research contributes to the conceptual development of citizen science in the context of adaptive governance and provides an example of a co-design process with a focus on building a citizen science tool for the exploration of social-ecological systems. In addition, the thesis contributes to practical development by identifying a set of opportunities for change of current data collection and meaning-making towards more adaptive surface water governance in Luxembourg and by making first experiences with surface water citizen science in Luxembourg, while engaging multiple place-based, regional, and national partners. Towards the above-mentioned goal, the research project, first, examined the current data collection programmes and meaning-making approaches for the governance of surface water bodies in Luxembourg. Prevailing practices are discussed based on key criteria for adaptive governance based on relevant academic literature. The research project, then, examined different approaches to environmental citizen science as alternative and complementary data collection programmes and meaning-making approaches in view of their potential to contribute to more adaptive surface water governance.The research project set out to do so by taking a transdisciplinary sustainability science research approach. The methodology encompassed (1) semi-structured qualitative interviews with specialists in the water domain and documentary review to gain insights into the current data collection programmes and meaning-making approaches in Luxembourg, (2) the trialling of two contributory surface water citizen science projects based on the Freshwater Watch citizen science tool by Earthwatch, an approach, in which volunteers are called upon to engage in data collection designed by scientists, and (3) the co-creation of surface water citizen science projects with interested groups based in Luxembourg centred around co-design workshops, in which the co-design partners were invited to explore changes and challenges and to develop sets of parameters for investigating the state of surface water bodies based on their research interests. In line with other studies, the findings show that citizen science can, indeed, constitute new sources of data on surface water bodies and, thus, increase data availability. Citizen science can lead to datasets on multiple temporal and spatial levels, and may increase overall transparency (of, for example, data on water quality). It can also contribute to more transparency in the meaning of data and increase the capacity for individual meaning-making. The findings show, in particular, that citizen science can increase the diversity of approaches to data collection and meaning-making, as projects constitute channels for the engagement of different knowledge types and can utilise new funding sources with alternative funding criteria. In addition, the case studies have shown that citizen science is particularly useful for complementing current official data collection, in particular, with respect to data from smaller water bodies, and for linking ecological data with social and technological data for a faster detection of changes in the system and a better grasp of the evolution of drivers of change. Interestingly, the study suggests that contributory citizen science may be better suited for the initial engagement of those, who are not specialised or professionally engaged in the water domain. Specialists and professionals, in turn, showed a bigger interest in engaging in co-design. [less ▲]

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See detailPolitical Philosophy
Heidemann, Dietmar UL

in Kant Yearbook (2021), 13

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See detailAuthenticity. Historical Data Integrity and the Layered Materiality of Digital Objects
Fickers, Andreas UL

in Balbi, Gabriele; Ribeiro, Nelson; Schafer, Valerie (Eds.) et al Digital Roots. Historicizing Media and Communication Concepts of the Digital Age (2021)

As media environments and communication practices evolve over time, so do theoretical concepts. This book analyzes some of the most well-known and fiercely discussed concepts of the digital age from a ... [more ▼]

As media environments and communication practices evolve over time, so do theoretical concepts. This book analyzes some of the most well-known and fiercely discussed concepts of the digital age from a historical perspective, showing how many of them have pre-digital roots and how they have changed and still are constantly changing in the digital era. Written by leading authors in media and communication studies, the chapters historicize 16 concepts that have become central in the digital media literature, focusing on three main areas. The first part, Technologies and Connections, historicises concepts like network, media convergence, multimedia, interactivity and artificial intelligence. The second one is related to Agency and Politics and explores global governance, datafication, fake news, echo chambers, digital media activism. The last one, Users and Practices, is finally devoted to telepresence, digital loneliness, amateurism, user generated content, fandom and authenticity. The book aims to shed light on how concepts emerge and are co-shaped, circulated, used and reappropriated in different contexts. It argues for the need for a conceptual media and communication history that will reveal new developments without concealing continuities and it demonstrates how the analogue/digital dichotomy is often a misleading one. [less ▲]

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