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See detailWohlbefinden und Gesundheit im Jugendalter: Theoretische Perspektiven, empirische Befunde und Praxisansätze
Heinen, Andreas UL; Samuel, Robin UL; Vögele, Claus UL et al

Book published by Springer VS Wiesbaden (2022)

Dieser Open-Access-Band bietet eine Übersicht disziplinärer Zugänge und aktueller empirischer Befunde zum Wohlbefinden und gesundheitsrelevanten Verhalten von Jugendlichen und jungen Erwachsenen ... [more ▼]

Dieser Open-Access-Band bietet eine Übersicht disziplinärer Zugänge und aktueller empirischer Befunde zum Wohlbefinden und gesundheitsrelevanten Verhalten von Jugendlichen und jungen Erwachsenen. Internationale Perspektiven renommierter Experten sowie Beiträge von Akteuren aus verschiedenen Praxisfeldern in Luxemburg ergänzen die Sammlung. Sie machen diesen Band zu einem unverzichtbaren Werk nicht nur für Wissenschaftler, sondern auch für Fachpersonen aus der Praxis mit einem Interesse am Thema Wohlbefinden und Gesundheit junger Menschen. [less ▲]

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See detailEfficient optimization-based quadrature for variational discretization of nonlocal problems
Pasetto, Marco; Shen, Zhaoxiang UL; D'Elia, Marta et al

in Computer Methods in Applied Mechanics and Engineering (2022), 396

Casting nonlocal problems in variational form and discretizing them with the finite element (FE) method facilitates the use of nonlocal vector calculus to prove well-posedness, convergence, and stability ... [more ▼]

Casting nonlocal problems in variational form and discretizing them with the finite element (FE) method facilitates the use of nonlocal vector calculus to prove well-posedness, convergence, and stability of such schemes. Employing an FE method also facilitates meshing of complicated domain geometries and coupling with FE methods for local problems. However, nonlocal weak problems involve the computation of a double-integral, which is computationally expensive and presents several challenges. In particular, the inner integral of the variational form associated with the stiffness matrix is defined over the intersections of FE mesh elements with a ball of radius δ, where δ is the range of nonlocal interaction. Identifying and parameterizing these intersections is a nontrivial computational geometry problem. In this work, we propose a quadrature technique where the inner integration is performed using quadrature points distributed over the full ball, without regard for how it intersects elements, and weights are computed based on the generalized moving least squares method. Thus, as opposed to all previously employed methods, our technique does not require element-by-element integration and fully circumvents the computation of element–ball intersections. This paper considers one- and two-dimensional implementations of piecewise linear continuous FE approximations, focusing on the case where the element size h and the nonlocal radius δ are proportional, as is typical of practical computations. When boundary conditions are treated carefully and the outer integral of the variational form is computed accurately, the proposed method is asymptotically compatible in the limit of h∼δ→0, featuring at least first-order convergence in L2 for all dimensions, using both uniform and nonuniform grids. Moreover, in the case of uniform grids, the proposed method passes a patch test and, according to numerical evidence, exhibits an optimal, second-order convergence rate. Our numerical tests also indicate that, even for nonuniform grids, second-order convergence can be observed over a substantial pre-asymptotic regime. © 2022 Elsevier B.V. [less ▲]

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See detailAcademic Achievement and Subjective Well-being: A Representative Cross-sectional Study
Wollschläger, Rachel UL; Esch, Pascale UL; Keller, Ulrich UL et al

in Heinen, Andreas; Samuel, Robin; Vögele, Claus (Eds.) et al Wohlbefinden und Gesundheit im Jugendalter (2022)

Formal education is a very important, time-intensive, and highly consequential aspect of adolescents’ everyday life. School as well as education can influence adolescents’ well-being in both the short ... [more ▼]

Formal education is a very important, time-intensive, and highly consequential aspect of adolescents’ everyday life. School as well as education can influence adolescents’ well-being in both the short- and long-term. In return, adolescents’ well-being in- and outside school may affect their educational achievement. The objective of the present study is to investigate how self-reported dimensions of adolescents’ subjective well-being (SWB) in an educational context (i.e., academic self-concept, school anxiety, social and emotional inclusion) relate to educational pathways (regular vs. irregular school transitions; attendance of more vs. less prestigious secondary school tracks) and standardized assessment scores in key academic areas (i.e., mathematics and languages). Drawing on representative data emerging from the Luxembourg School Monitoring Programme “Épreuves Standardisées” (academic year 2018/2019), the relationship between academic achievement and students’ self-reported well-being was analysed cross-sectionally for the entire student cohorts of 5th and 9th graders. Result indicated that grades and educational pathways affect SWB, whereby in general lower ratings of SWB were observed in older students, students that experienced grade retention and students in lower secondary school tracks. Furthermore, ratings of SWB explained a significant proportion of variance in academic achievement in bot Grade 5 and Grade 9. These findings highlight the importance of student´ SWB in education. SWB may not only affect academic achievement, but also impact motivation and engagement and hence long-term educational success. Implications of the findings for research and educational debate are discussed. [less ▲]

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See detailArtificial Intelligence as a Call for Retail Banking : Applying Digital Options Thinking to Artificial Intelligence Adoption
Fridgen, Gilbert UL; Hartwich, Eduard UL; Rägo, Vadim et al

in Proceedings of the Thirtieth European Conference on Information Systems (ECIS 2022), Timisoara, Romania: Artificial Intelligence as a Call for Retail Banking : Applying Digital Options Thinking to Artificial Intelligence Adoption (2022)

Technology-driven challenges, both existing and emerging, require banks to invest in IT capabilities, especially in artificial intelligence (AI). Digital options theory presents a valuable guide rail for ... [more ▼]

Technology-driven challenges, both existing and emerging, require banks to invest in IT capabilities, especially in artificial intelligence (AI). Digital options theory presents a valuable guide rail for these investments. However, the nature of AI as a moving frontier of computing requires certain extensions to established digital option thinking. Based on interviews with 23 experts in the retail banking industry, we highlight the importance of thinking broadly when laying the foundation for AI options and being mindful of the dynamic effects of contextual factors. Drawing from digital options theory and the Technology-Organization-Environment framework as dual lens, our study adds a structured approach to consciously balance resources and AI-related capability investments with a broader consideration of the banking industry’s complex environment. In this way, our study complements recent research on the interplay between incumbents’ resources and digital opportunities. [less ▲]

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See detailEspaces (in)sensibles : l'appropriation en didactique comparée
Thiltges, Sébastian UL; Raus, Tonia

in Thiltges, Sébastian; Raus, Tonia (Eds.) spaces (in)sensibles : l'appropriation en didactique comparée (2022)

La nouvelle d'anticipation « Une voix dans le silence » (trad.) de Yorick Schmit sensibilise les lecteurs aux bouleversements environnementaux, psychologiques et affectifs engendrés par une catastrophe ... [more ▼]

La nouvelle d'anticipation « Une voix dans le silence » (trad.) de Yorick Schmit sensibilise les lecteurs aux bouleversements environnementaux, psychologiques et affectifs engendrés par une catastrophe nucléaire. Partant d'une lecture écopoétique, nous imaginons l'étude de ce récit en langue luxembourgeoise en cours de français, afin d'exploiter la tension ainsi créée par le dispositif translinguistique et interculturel. Dans une double perspective de didactique des langues et de la littérature, nous interrogeons dès lors le rôle du sensible dans le développement du plurilinguisme dans l'enseignement-apprentissage de la littérature. Pour ce faire, notre approche de didactique comparée se fonde sur le paradigme de l'appropriation en tant que concept à la fois linguistique et littéraire : le lecteur devient sensible en faisant sien le récit lu, dans un corps à corps avec la matérialité du texte écrit dans une langue familière en tant que langue véhiculaire mais étrangère en tant que langue littéraire, favorisant ainsi une prise de conscience des sens de la langue et du texte. [less ▲]

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See detailMental Health and Well-Being in Adolescence: The Role of Child Attachment and Parental Reflective Functioning
Decarli, Alessandro; Pierrehumbert, Blaise; Schulz, André UL et al

in Heinen, Andreas; Samuel, Robin; Vögele, Claus (Eds.) et al Wohlbefinden und Gesundheit im Jugendalter (2022)

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See detailBiocomposites with Epoxy Resin Matrix Modified with Ingredients of Natural Origin
Szatkowski, Piotr; Szatkowska, Martyna; Gralewski, Jacek et al

in Materials (2022), 15

This study aims to present various forms of cellulose, whose shape depends on the source of origin, and to demonstrate the differences in the influence on the properties of materials produced with its ... [more ▼]

This study aims to present various forms of cellulose, whose shape depends on the source of origin, and to demonstrate the differences in the influence on the properties of materials produced with its participation. For this purpose, composites with various plant additives have been designed and obtained. Some of them have undergone chemical and pyrolytic modifications. The results of the mechanical, physicochemical and microscopic tests showed differences in cellulose structure, even in the case of very similar sources, and its diversified influence on the characteristics of the obtained materials. The research shows the effect of the use of natural additives and their modified versions on the mechanical properties of the composite based on epoxy resin. It turns out that cellulose modifiers are not only fillers that reduce the price of the final product but can also increase some mechanical properties, e.g., compressive strength, which is an additional advantage and a reason for wider use. The potential of natural resources is not yet fully understood. Relatively recently, people have started to be interested in cellulose on a nanometric scale, as it turns out that it can exist in several different forms with interesting properties. [less ▲]

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See detailLes devises des chirographes échevinaux de Tournai et de Douai au XIIIe siècle: formes, usages et fonctions
Brunner, Thomas; Mineo, Emilie UL

in Archiv für Diplomatik, Schriftgeschichte, Siegel- und Wappenkunde (2022), 68

Longtemps négligés, les chirographes émis par les échevinages des villes des anciens Pays-Bas à partir du début du XIIIe siècle offrent de belles perspectives pour l’étude de la diplomatique urbaine. Ces ... [more ▼]

Longtemps négligés, les chirographes émis par les échevinages des villes des anciens Pays-Bas à partir du début du XIIIe siècle offrent de belles perspectives pour l’étude de la diplomatique urbaine. Ces actes étaient rédigés en plusieurs exemplaires séparés par une devise qui était coupée en son milieu au moment de la validation. Le présent article cherche à cerner, dans une perspective comparatiste, la nature et la fonction de la devise, encore peu étudiée, en s’appuyant sur 394 chirographes de Tournai et sur 1274 de Douai du XIIIe siècle. Dans les deux villes, on utilisait des chirographes superposés avec découpe rectiligne mais alors qu’à Douai la légende, constituée du mot «chirographe», tend à s’homogénéiser au fil du siècle, à Tournai, les mots ou les signes graphiques utilisés sont plus variés. Chaque scribe était libre de la réaliser à sa convenance. La devise n’entrait en fonction qu’au moment de la découpe durant la cérémonie de validation de l’acte en présence des échevins, qui conservaient un exemplaire tandis que l’autres était remise au bénéficiaire. Elle devait théoriquement servir à prouver l’authenticité du document en cas de litige. De fait, les sources évoquent rarement le rapprochement des expéditions et montrent que la devise est un moyen de sécurisation juridique subordonné au témoignage des échevins et que la portion d’acte sanctuarisée par sa conservation dans les archives municipales joue un rôle de «super-original» [less ▲]

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See detailFostering preservice teachers’ expectancies and values towards computational thinking
Weber, Anke Maria UL; Bastian, Morten; Barkela, Veronika et al

in Frontiers in Psychology (2022), 13

Theory: Digital technologies have become an integral part of everyday life that children are exposed to. Therefore, it is important for children to acquire an understanding of these technologies early on ... [more ▼]

Theory: Digital technologies have become an integral part of everyday life that children are exposed to. Therefore, it is important for children to acquire an understanding of these technologies early on by teaching them computational thinking (CT) as a part of STEM. However, primary school teachers are often reluctant to teach CT. Expectancy-value theory suggests that motivational components play an important role in teaching and learning. Thus, one hindrance to teachers’ willingness to teach CT might be their low expectancies of success and high emotional costs, e.g., anxiety towards CT. Thus, introducing preservice teachers to CT during their university years might be a promising way to support their expectancies and values, while simultaneously alleviating their emotional costs. Prior CT competences might contribute to these outcomes. Aims: We investigated whether a specifically designed seminar on CT affected preservice teachers’ expectancies and values towards programming. Method: A total of 311 German primary school and special education preservice teachers took part in the study. The primary school preservice teachers received a seminar on CT and programming with low-threshold programming tasks, while the special education teachers served as a baseline group. The seminar was specifically designed to enhance expectancies and values and decrease emotional costs, following implications of research on expectancy-value theory. Results: The preservice teachers who visited the seminar gained higher expectancies and values towards CT and programming compared to the baseline group. Moreover, their emotional costs decreased. CT was positively related to change in expectancies and values and negatively related to emotional costs. Discussion: Interventions with low-threshold programming tasks can support primary school preservice teachers in finding trust in their abilities and values towards CT. Moreover, their anxiety towards CT and programming can be alleviated. Thus, first steps in preparing preservice teachers to teach CT in their future classrooms can be taken in university. [less ▲]

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See detailMobile robots path planning and mobile multirobots control: A review
Hichri, Bassem UL; Gallala, Abir; Giovannini, Francesco et al

in Robotica (2022), 40(12), 4257-4270

Mobile robots and multimobile robotic system usage for task achievement have been an emerging research area since the last decades. This article presents a review about mobile robot navigation problem and ... [more ▼]

Mobile robots and multimobile robotic system usage for task achievement have been an emerging research area since the last decades. This article presents a review about mobile robot navigation problem and multimobile robotic systems control. The main focus is made on path planning strategies and algorithms in static and dynamic environments. A classification on mobile robots path planning has been defined in the literature and divided to classical and heuristic approaches. Each of them has its own advantages and drawbacks. On the other hand, the control of multimobile robots is presented and the control approaches for a fleet of robots are presented. Scientists found that using more than one robot as opposed to a single one presents many advantages when considering redundant task, dangerous tasks, or a task that scales up or down in time or that requires flexibility. They have defined three main approaches of multiple robots control: behavior-based approach, leader–follower approach, and virtual structure approach. This article addresses these approaches and provides examples from the literature. [less ▲]

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See detailUngleichheiten in schulischen Gesundheitsproblemen und subjektivem Wohlbefinden bei luxemburgischen Grund- und Sekundarschüler/innen
Hadjar, Andreas UL; de Moll, Frederick UL

in Heinen, Andreas; Samuel, Robin; Willems, Helmut Erich (Eds.) et al Wohlbefinden und Gesundheit im Jugendalter. Theoretische Perspektiven, empirische Befunde und Praxis (2022)

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See detailDouble quasi-Poisson algebras are pre-Calabi-Yau
Fernandez Alvarez, David UL; Herscovich, Estanislao

in International Mathematics Research Notices (2022), 2022(23), 18291-18345

In this article, we prove that double quasi-Poisson algebras, which are noncommutative analogues of quasi-Poisson manifolds, naturally give rise to pre-Calabi-Yau algebras. This extends one of the main ... [more ▼]

In this article, we prove that double quasi-Poisson algebras, which are noncommutative analogues of quasi-Poisson manifolds, naturally give rise to pre-Calabi-Yau algebras. This extends one of the main results in [11], where a correspondence between certain pre-Calabi-Yau algebras and double Poisson algebras was found (see also [13, 12, 10]). However, a major difference between the pre-Calabi-Yau algebra constructed in the mentioned articles and the one constructed in this work is that the higher multiplications indexed by even integers of the underlying A∞-algebra structure of the pre-Calabi-Yau algebra associated with double quasi-Poisson algebra do not vanish, but are given by nice cyclic expressions multiplied by explicitly determined coefficients involving the Bernoulli numbers. [less ▲]

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See detailVerifiable Decryption in the Head
Gjosteen, Kristian; Haines, Thomas; Mueller, Johannes UL et al

in ACISP 2022 (2022)

In this work we present a new approach to verifiable decryption which converts a 2-party passively secure distributed decryption protocol into a 1-party proof of correct decryption. This leads to an ... [more ▼]

In this work we present a new approach to verifiable decryption which converts a 2-party passively secure distributed decryption protocol into a 1-party proof of correct decryption. This leads to an efficient and simple verifiable decryption scheme for lattice-based cryptography, especially for large sets of ciphertexts; it has small size and lightweight computations as we reduce the need of zero-knowledge proofs for each ciphertext. We believe the flexibility of the general technique is interesting and provides attractive trade-offs between complexity and security, in particular for the interactive variant with smaller soundness. Finally, the protocol requires only very simple operations, making it easy to correctly and securely implement in practice. We suggest concrete parameters for our protocol and give a proof of concept implementation, showing that it is highly practical. [less ▲]

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See detailEuler continuants in noncommutative quasi-Poisson geometry
Fernandez Alvarez, David UL; Fairon, Maxime

in Forum of Mathematics, Sigma (2022), 10

It was established by Boalch that Euler continuants arise as Lie group valued moment maps for a class of wild character varieties described as moduli spaces of points on P1 by Sibuya. Furthermore, Boalch ... [more ▼]

It was established by Boalch that Euler continuants arise as Lie group valued moment maps for a class of wild character varieties described as moduli spaces of points on P1 by Sibuya. Furthermore, Boalch noticed that these varieties are multiplicative analogues of certain Nakajima quiver varieties originally introduced by Calabi, which are attached to the quiver Γn on two vertices and n equioriented arrows. In this article, we go a step further by unveiling that the Sibuya varieties can be understood using noncommutative quasi-Poisson geometry modelled on the quiver Γn . We prove that the Poisson structure carried by these varieties is induced, via the Kontsevich–Rosenberg principle, by an explicit Hamiltonian double quasi-Poisson algebra defined at the level of the quiver Γn such that its noncommutative multiplicative moment map is given in terms of Euler continuants. This result generalises the Hamiltonian double quasi-Poisson algebra associated with the quiver Γ1 by Van den Bergh. Moreover, using the method of fusion, we prove that the Hamiltonian double quasi-Poisson algebra attached to Γn admits a factorisation in terms of n copies of the algebra attached to Γ1 [less ▲]

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See detailHow Patent Rights Affect University Science
Berge, Laurent; Doherr, Thorsten; Hussinger, Katrin UL

E-print/Working paper (2022)

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See detailVisual Mathematical Dictionary
Perucca, Antonella UL

Article for general public (2022)

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See detailUnified treatment of Artin-type problems
Järviniemi, Olli; Perucca, Antonella UL

in Research in Number Theory (2022)

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See detailDer 50cm lange Gliedermaßstab
Foyen, Andy UL; Perucca, Antonella UL

in Beiträge zum Mathematikunterricht 2022 (Tagungsband GDM) (2022)

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See detailWhich Factors Play a Role in Coco Issuance? Evidence from European Banks.
Wolff, Christian UL

in Best Paper Award (2022)

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See detailDas Neue in der Kritik der reinen Vernunft
Heidemann, Dietmar UL

in Immanuel Kant 1724–2024. Ein europäischer Denker, (2022)

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