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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 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 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 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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See detailIntroduction: sémiotiques de l'archive
Fickers, Andreas UL; Dondero, Maria Guilia; Tore, Gian Maria UL et al

in Signata. Annales des Sémiotiques (2021), 12

Ce numéro de Signata vise à poser la question de l’archive d’un point de vue sémiotique et sémio-pragmatique. On entend ici par « sémiotique » non pas une discipline unique, mais une pluralité de manières ... [more ▼]

Ce numéro de Signata vise à poser la question de l’archive d’un point de vue sémiotique et sémio-pragmatique. On entend ici par « sémiotique » non pas une discipline unique, mais une pluralité de manières de questionner le sens, les formes et les valeurs au sein des disciplines historiques, sociologiques, philosophiques, linguistiques, médiatiques, artistiques, etc. Le but du dossier est ainsi la constitution d’une cartographie qui embrasse les différentes approches qui, dans le domaine de l’archive, peuvent faire émerger les questionnements liés au sens. [less ▲]

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See detailOn deformation quantization of quadratic Poisson structures
Merkoulov (merkulov), Serguei UL; Khoroshkin, Anton

E-print/Working paper (2021)

We study the deformation complex of the dg wheeled properad of Z-graded quadratic Poisson structures and prove that it is quasi-isomorphic to the even M. Kontsevich graph complex. As a first application ... [more ▼]

We study the deformation complex of the dg wheeled properad of Z-graded quadratic Poisson structures and prove that it is quasi-isomorphic to the even M. Kontsevich graph complex. As a first application we show that the Grothendieck-Teichmüller group acts on the genus completion of that wheeled properad faithfully and essentially transitively. As a second application we classify all universal quantizations of Z-graded quadratic Poisson structures together with the underlying (so called) homogeneous formality maps. [less ▲]

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See detailToken Economy
Sunyaev, Ali; Kannengießer, Niclas; Beck, Roman et al

in Business and Information Systems Engineering (2021)

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See detailThe Geostationary Ring: Practice and Law, Martha Mejia-Kaiser, Nijhoff/ Brill, Leiden 2020
Hofmann, Mahulena UL; Blount, Percy UL

in Air and Space Law (2021), 46(3), 475-478

The book is a comprehensive analysis of the international regime of the geostationary orbit.

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See detailCOVID19 Disease Map, a computational knowledge repository of virus-host interaction mechanisms.
Ostaszewski, Marek UL; Niarakis, Anna; Mazein, Alexander UL et al

in Molecular systems biology (2021), 17(10), 10387

We need to effectively combine the knowledge from surging literature with complex datasets to propose mechanistic models of SARS-CoV-2 infection, improving data interpretation and predicting key targets ... [more ▼]

We need to effectively combine the knowledge from surging literature with complex datasets to propose mechanistic models of SARS-CoV-2 infection, improving data interpretation and predicting key targets of intervention. Here, we describe a large-scale community effort to build an open access, interoperable and computable repository of COVID-19 molecular mechanisms. The COVID-19 Disease Map (C19DMap) is a graphical, interactive representation of disease-relevant molecular mechanisms linking many knowledge sources. Notably, it is a computational resource for graph-based analyses and disease modelling. To this end, we established a framework of tools, platforms and guidelines necessary for a multifaceted community of biocurators, domain experts, bioinformaticians and computational biologists. The diagrams of the C19DMap, curated from the literature, are integrated with relevant interaction and text mining databases. We demonstrate the application of network analysis and modelling approaches by concrete examples to highlight new testable hypotheses. This framework helps to find signatures of SARS-CoV-2 predisposition, treatment response or prioritisation of drug candidates. Such an approach may help deal with new waves of COVID-19 or similar pandemics in the long-term perspective. [less ▲]

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See detailQuantifying activities of daily living impairment in Parkinson’s disease using the Functional Activities Questionnaire
Becker, Sara; Pauly, Claire UL; Lawton, Michael et al

in Neurological Sciences (2021)

Objective Cognitive-driven activity of daily living (ADL) impairment in Parkinson’s disease (PD) is increasingly discussed as prodromal marker for dementia. Diagnostic properties of assessments for this ... [more ▼]

Objective Cognitive-driven activity of daily living (ADL) impairment in Parkinson’s disease (PD) is increasingly discussed as prodromal marker for dementia. Diagnostic properties of assessments for this specifc ADL impairment are sparsely investigated in PD. The ability of the Functional Activities Questionnaire (FAQ) for diferentiating between PD patients with normal cognition and with mild cognitive impairment (PD-MCI), according to informant and self-reports, was examined. Global cognitive function in groups with and without mild ADL impairment was compared according to diferent cut-ofs. Methods Multicenter data of 589 patients of an international cohort (CENTRE-PD) were analyzed. Analyses were run separately for informant-rated and self-rated FAQ. Receiver operating characteristic (ROC) analysis was conducted to defne the optimal FAQ cut-of for PD-MCI (≥1), and groups were additionally split according to reported FAQ cut-ofs for PD-MCI in the literature (≥3,≥5). Binary logistic regressions examined the efect of the Montreal Cognitive Assessment (MoCA) score in PD patients with and without mild ADL impairment. Results Two hundred and twenty-fve (38.2%) patients were classifed as PD-MCI. For all three cut-of values, sensitivity was moderate to low (<0.55), but specifcity was moderately high (>0.54) with a tendency of higher values for self-reported defcits. For the self-report, the cut-of≥3 showed a signifcant efect of the MoCA (B= −0.31, p=0.003), where FAQ≥3 patients had worse cognition. No efect for group diferences based on informant ratings was detected. Conclusion Our data argue that self-reported ADL impairments assessed by the FAQ show a relation to the severity of cognitive impairment in PD. [less ▲]

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