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See detailLe complot judéo-maçonnique en 7 minutes top chrono
Meyers, Christian UL

Conference given outside the academic context (2020)

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See detailNew opportunities by laser joining of dissimilar materials
Plapper, Peter UL

in 6. Automotive Photonic, Ditzingen (2020)

The presentation gives an overview about research projects at UL related to laser welding of dissimilar materials.

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See detailRecyclable Architecture: Prefabricated and Recyclable Typologies
Ferreira Silvia, Marielle; Jayasinghe, Laddu Bhagya; Waldmann, Danièle UL et al

in Sustainability MDPI (2020)

Buildings are being demolished without taking into the account the waste generated, and the housing shortage problem is getting more critical as cities are growing and the demand for built space and the ... [more ▼]

Buildings are being demolished without taking into the account the waste generated, and the housing shortage problem is getting more critical as cities are growing and the demand for built space and the use of resources are increasing. Architectural projects have been using prefabrication and modular systems to solve these problems. However, there is an absence of structures that can be disassembled and reused when the structure’s life ran its course. This paper presents three building prototypes of new recyclable architectural typologies: (i) a Slab prototype designed as a shelf structure where wooden housing modules can be plugged in and out, (ii) a Tower prototype allowing for an easy change of layout and use of different floors and (iii) a Demountable prototype characterized by the entire demountability of the building. These typologies combine modularity, flexibility, and disassembling to address the increasing demands for multi‐use, re‐usable and resource‐efficient constructions. Design, drawings, plans, and 3D models are developed, tested and analyzed as a part of the research. The results show that the implementation of the recyclable architectural concept at the first design stage is feasible and realistic, and ensures the adaptation through time, increases life span, usability and the material reusability, while avoiding demolition, which in turn reduces the construction waste and, consequently, the CO2 emissions. [less ▲]

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See detailParents, schools and multilingual children
Aleksic, Gabrijela UL; Bebic, Dzoen Dominique UL

Conference given outside the academic context (2020)

Early literacy skills are critical for children’s later academic achievement. A wealth of research showed that children’s home languages should not be abandoned, as they are crucial for promoting dynamic ... [more ▼]

Early literacy skills are critical for children’s later academic achievement. A wealth of research showed that children’s home languages should not be abandoned, as they are crucial for promoting dynamic multilingualism, assuring cross-linguistic transfer and developing identities. To explore home literacy environment and family language policy of language minority preschool children in Luxembourg, we obtained 600 parent questionnaires, tested 226 children age 4 to 6 in their home languages and Luxembourgish, and interviewed 32 families. The results from the questionnaires showed that the home resources and parent involvement influenced children’s language awareness and their print knowledge irrespective of parent’s education and their wealth. Concerning children’s competences in Luxembourgish, children with positive attitudes towards their school did better than their peers in other schools. In the interviews, parents explained that maintaining home language is important for keeping connections with family, friends and their culture. This is the language parents feel emotionally connected to and the easiest to transmit to their children. Language maintenance is mostly achieved through conversations, movies, games and books in the home languages, children’s attendance of language schools on weekends, celebrations of traditions as well as holidays in the native country of the parents. The home language is, however, not something parents enforce too strictly, as they mostly correct the children’s linguistic mistakes by simple repetition. It is often with great pride that parents report their children having an excellent proficiency in their home language. Finally, through our professional development training in translanguaging we are helping teachers to integrate children’s different home languages and cultures into the classroom and strengthen the home-school collaboration in order to support children’s well-being, learning and identities. [less ▲]

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See detailRadial processes for sub-Riemannian Brownian motions and applications
Baudoin, Fabrice; Grong, Erlend; Kuwada, Kazumasa et al

E-print/Working paper (2020)

We study the radial part of sub-Riemannian Brownian motion in the context of totally geodesic foliations. Itô's formula is proved for the radial processes associated to Riemannian distances approximating ... [more ▼]

We study the radial part of sub-Riemannian Brownian motion in the context of totally geodesic foliations. Itô's formula is proved for the radial processes associated to Riemannian distances approximating the Riemannian one. We deduce very general stochastic completeness criteria for the sub-Riemannian Brownian motion. In the context of Sasakian foliations and H-type groups, one can push the analysis further, and taking advantage of the recently proved sub-Laplacian comparison theorems one can compare the radial processes for the sub-Riemannian distance to one-dimensional model diffusions. As a geometric application, we prove Cheng's type estimates for the Dirichlet eigenvalues of the sub-Riemannian metric balls, a result which seems to be new even in the Heisenberg group. [less ▲]

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See detailMeasuring Pants
Doan, Nhat Minh UL

E-print/Working paper (2020)

We investigate the terms arising in an identity for hyperbolic surfaces proved by Luo and Tan, namely showing that they vary monotonically in terms of lengths and that they verify certain convexity ... [more ▼]

We investigate the terms arising in an identity for hyperbolic surfaces proved by Luo and Tan, namely showing that they vary monotonically in terms of lengths and that they verify certain convexity properties. Using these properties, we deduce two results. As a first application, we show how to deduce a theorem of Thurston which states, in particular for closed hyperbolic surfaces, that if a simple length spectrum "dominates" another, then in fact the two surfaces are isometric. As a second application, we show how to find upper bounds on the number of pairs of pants of bounded length that only depend on the boundary length and the topology of the surface. [less ▲]

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See detailLa promesse de Dupong...
Scuto, Denis UL

Article for general public (2020)

Despite the promise that foreign Jews who had resided in Luxembourg before the war and had to flee nazi persecution, could come back after the war, Luxembourg authorities restricted the return of the ... [more ▼]

Despite the promise that foreign Jews who had resided in Luxembourg before the war and had to flee nazi persecution, could come back after the war, Luxembourg authorities restricted the return of the foreign Jews who had survived and made an application to return and settle in the Grand-Duchy. The article is based on the analysis of a database of more than 3.000 foreign Jews who had resided in Luxembourg in the 1930s. More than 400 foreign Jews tried to return after the war. [less ▲]

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See detailArchivage et patrimoine nativement numérique
Schafer, Valerie UL

Presentation (2020, February 07)

Intervention sur l'archivage du Web en déclinant/discutant l'argumentaire de la séance– Les garanties des libertés numériques (notamment sur les enjeux de souveraineté nationale / l'interopérabilité des ... [more ▼]

Intervention sur l'archivage du Web en déclinant/discutant l'argumentaire de la séance– Les garanties des libertés numériques (notamment sur les enjeux de souveraineté nationale / l'interopérabilité des données etc.) Argumentaire de la séance : L’effectivité des droits et libertés numériques constitue une condition nécessaire de la confiance des citoyens dans les biens et services numériques. Créer les conditions de l’effectivité des libertés numériques représente à l’évidence un enjeu central pour les prochaines années. Les outils juridiques destinés à garantir l’effectivité des libertés numériques font l’objet d’intenses débats, comme par exemple s’agissant de la souveraineté numérique, de la transparence des données et des algorithmes, de la portabilité ou de l’interopérabilité des données. [less ▲]

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See detailOptimization assisted redesigning a structure of a hydrogen valve: the redesign process and numerical evaluations
Cao, Thanh Binh UL; Kedziora, Slawomir UL; Sellen, Stephan UL et al

in International Journal on Interactive Design and Manufacturing (2020)

This study introduced the redesign process of an automotive hydrogen valve. The process relied on the structural optimization approach, which used to build up the new valves having promising stiffness and ... [more ▼]

This study introduced the redesign process of an automotive hydrogen valve. The process relied on the structural optimization approach, which used to build up the new valves having promising stiffness and the lowest possible weights. To achieve the goals, the study was proposed to be taken place via the three main stages. These stages included topology optimization, lattice optimization, as well as numerical evaluations. The achieved results firstly indicated that the two newly designed valves possessed longer life and lower mass than the original valve. Especially, the topology optimized one could withstand more than 5E4 working cycles in the pre-treated condition before the first crack would be nucleated. The results also pointed out the influences of the pre-treatment pressure on the fatigue performance of the hydrogen valve. Within the examined ranges of the pressure, increasing the pressure’s magnitudes tended to shorten the fatigue life of the topology optimized valve. Additionally, the results highlighted the impact of the employed materials on the estimated fatigue life of such a non-treated structure. In the highlights, the considered steel valves could function normally far beyond 1.5E5 working cycles while the aluminum valves would have an initial crack formation prior to reaching 3E3 cycles. The results also suggested that further practical evidence is needed to not only confirm whether the selected printed aluminum is among the promising candidate materials of the hydrogen valve but also to support the described evaluations. [less ▲]

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See detailOn the order of the reductions of algebraic numbers
Sgobba, Pietro UL

Presentation (2020, February 06)

Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. For almost all primes p of K, we consider the order of the cyclic group (G mod p), and ask whether this number ... [more ▼]

Let K be a number field, and let G be a finitely generated and torsion-free subgroup of K*. For almost all primes p of K, we consider the order of the cyclic group (G mod p), and ask whether this number lies in a given arithmetic progression. The density of primes for which this condition holds exists (this generalizes a result of Ziegler from 2006) and it is, under certain assumptions, a computable positive rational number. We also present a uniformity property concerning some special cases. This is a joint work with A. Perucca. [less ▲]

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See detailDenis Scuto an Dr. Gerben Zaagsma iwwer den FORUM Z Holocaust: History and Memory
Zaagsma, Gerben UL; Scuto, Denis UL

Diverse speeches and writings (2020)

Déi zwee Historiker erzielen iwwer den FORUM Z, organiséiert vum C2DH, deen haut iwwer den Theema Holocaust: History and Memory, geet. De Forum zu Mondorf an der Orangerie vum Thermalbad ass agedeelt an ... [more ▼]

Déi zwee Historiker erzielen iwwer den FORUM Z, organiséiert vum C2DH, deen haut iwwer den Theema Holocaust: History and Memory, geet. De Forum zu Mondorf an der Orangerie vum Thermalbad ass agedeelt an dräi Deeler: 1. The Holocaust and Jewish life in Luxembourg: filling the gaps 2. Holocaust research in the digital age 3. Combating anti-Semitism in contemporary Europe [less ▲]

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See detailRoundtable - Combating anti-Semitism in contemporary Europe
Zaagsma, Gerben UL; Santer, Georges; Feldman, David et al

Diverse speeches and writings (2020)

Roundtable Combating anti-Semitism in contemporary Europe What is the state of anti-Semitism in Europe, and Luxembourg, today? How can it be situated within the broader context of rising hate speech and ... [more ▼]

Roundtable Combating anti-Semitism in contemporary Europe What is the state of anti-Semitism in Europe, and Luxembourg, today? How can it be situated within the broader context of rising hate speech and crime, online and offline? What methods are being proposed to combat it? How does it relate to politics and the broader memory battles that are being fought in Europe today? These will be the themes addressed during a round table discussion with the following participants: - Dr. Gerben Zaagsma (moderator, C²DH) - Georges Santer (Ambassador, Chair of the International Holocaust Remembrance Alliance/IHRA) - Prof. David Feldman (Director, Pears Institute for the Study of Antisemitism, Birkbeck, University of London) - François Moyse (Chair, European Association for the Preservation and Promotion of Jewish Culture and Heritage) [less ▲]

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See detailLe relations belgo-luxembourgeoises: une mise en perspective historique
Brüll, Christoph UL

Scientific Conference (2020, February 05)

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See detailOpening the black box of the social learning process: The case of community of practices
Boughattas, Yosra; Geraudel, Mickaël UL; Claeye, Frederic

Scientific Conference (2020, February 04)

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See detailUrban Green Amenity and City Structure
Tran, Thi Thu Huyen UL

Doctoral thesis (2020)

One of the main components that make cities attractive to their residents is their public park and garden systems. Green urban areas from a small community garden to famous areas such as `Jardin du ... [more ▼]

One of the main components that make cities attractive to their residents is their public park and garden systems. Green urban areas from a small community garden to famous areas such as `Jardin du Luxembourg' in Paris not only shape the face of the city but are a quintessential aspect of the quality of life for local inhabitants. They offer places for local recreation, beautiful views, cleaner air and many other advantages. Recent research has validated the connection between urban parks and the well-being of the city's inhabitants. Although green urban areas might seem to be meagre in comparison with other natural ecosystems such as wetlands or forests, the value of the environmental, recreational, and other services they offer is likely to be disproportionally high due to their strategic locations. This dissertation focuses on studying the optimal provision of green urban areas and the welfare effects of a substantial change in green provision policies in the presence of other types of land uses and adverse shocks. It comprises four papers (chapters). [less ▲]

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See detailChristof Schöch lectures on the Use and Abuse of Word Embedding
Kamlovskaya, Ekaterina UL

Article for general public (2020)

A blog post reporting on a lecture about the use of word embeddings in humanities.

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See detailUne juste présence du passé?
Scuto, Denis UL

Article for general public (2020)

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See detailIdentifying Unintended Harms of Cybersecurity Measures
Chua, Yi Ting; Parkin, Simon; Edwards, Matthew et al

in Proceedings of ECRIME 2019 (2020, February 01)

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See detailLe Maître secret, 4e grade du REAA : Sortir de la Loge, entrer dans le Temple et se rapprocher du Saint des Saints
Meyers, Christian UL

Conference given outside the academic context (2020)

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See detailBankruptcy protection in airline markets: Does the impact vary in international and US domestic markets?
Mantin, Benny UL; Forsyth, Peter; Bock, Sebastian et al

in Transportation Research. Part A, General (2020), 132

We study the effects of Chapter 11 bankruptcy protection on competitive product pricing in both domestic and international markets using data from the airline industry. We find a decline of about 5% in ... [more ▼]

We study the effects of Chapter 11 bankruptcy protection on competitive product pricing in both domestic and international markets using data from the airline industry. We find a decline of about 5% in domestic markets and an even more significant drop in international markets. Further, in international markets the competing carriers respond by dropping their prices as well, whereas they slightly increase them domestically. By contrast, existing literature considers only domestic markets finding a more moderate fare drop of about 3% in domestic markets by the bankrupt carrier, with mixed results on the fare drop by competitors. [less ▲]

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