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See detailBlasmusikforschung, was ist das? Blasmusik, eine Disziplin zwischen Wissenschaft, Pädagogik und künstlerischer Praxis
Sagrillo, Damien UL

Presentation (2018, January 20)

Als die Gründerväter um Wolfgang Suppan im Jahre 1974 die IGEB ins Leben ruften, war es ihnen ein Bedürfnis, neben Erforschung auch noch den Begriff Förderung im Titel zu verankern. In meinem Vortrag ... [more ▼]

Als die Gründerväter um Wolfgang Suppan im Jahre 1974 die IGEB ins Leben ruften, war es ihnen ein Bedürfnis, neben Erforschung auch noch den Begriff Förderung im Titel zu verankern. In meinem Vortrag werde ich aufzeigen, was die Blasmusikforschung nach mittlerweile vierzig Jahren aufzuweisen hat und wie sie in Zukunft im Dienste der Blasmusikpraxis und zur sog. "community music" weiter zur Förderung des Blasmusikwesens beitragen kann. Dabei werden u.a. Verbindungen zur Musikpädagogik, zur Musiksoziologie, zur Militärmusikpraxis, zur, Repertoirekunde und zur Instrumentenkunde zu suchen sein. [less ▲]

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See detailAdaptive capacities of cancer cells in Glioblastoma
Dirkse, Anne Marie Elisabeth UL

Doctoral thesis (2018)

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See detailIntegrating User- and System-Centric Perspectives into Collaborative Compound Document Authoring
Klein, Johannes UL

Doctoral thesis (2018)

Computer-supported collaborative work is increasingly common in our professional and personal life. However, the expectations and requirements of the users are frequently neglected when addressing the ... [more ▼]

Computer-supported collaborative work is increasingly common in our professional and personal life. However, the expectations and requirements of the users are frequently neglected when addressing the technological challenges associated with the development of a distributed collaboration system. The proposed collaboration environment employs an integrative approach to distributed compound document authoring, including both a user- and system-centric perspective on collaborative work. An interruption-free, reliable, and responsive shared work environment with a near real-time representation of the work of others is a core expectation from the users. In order to provide these features, a fine-granular, graph-based data representation has been developed to serve as the basis for this approach. The data representing individual compound document elements is partitioned over sets of three distinct nodes in the graph structure. This separation of metadata and payload data enables the precise attribution of editing operations while maintaining an adaptable and extensible data representation. User-specific preferences allow for the individualization of a user's work environment to account for personal preferences, requirements from the current collaboration scenario, or limitations of the employed computer system. Support for complex, data type-specific editing commands is integrated with a concurrent command application and Layered Consistency Management model. This enables a near real-time representation of the work of others, the preservation of the users' editing intentions, and the maintenance of a globally consistent data state. Intra- and inter-document relations retain semantic connections between distinct data structure elements. Together with an element's supplemental data, this related information enables additional, autonomous conflict resolution approaches and facilitates a comprehensive representation of the conflict in case of a manual resolution process. By integrating these functionalities into one coherent system, the users are provided with an unobtrusive, yet reliable and feature-rich distributed work environment able to actively support collaborative compound document authoring. [less ▲]

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See detailHydrodynamic Analysis of Gas-Liquid-Liquid-Solid Reactors using the XDEM Numerical Approach
Baniasadi, Maryam UL; Peters, Bernhard UL; Baniasadi, Mehdi UL et al

in Canadian Journal of Chemical Engineering (2018)

Multiphase reactors are abundantly used in many industries. Among them, few reactors deal with four phases called gas-liquid-liquid-solid systems, which received less attention due to their complex ... [more ▼]

Multiphase reactors are abundantly used in many industries. Among them, few reactors deal with four phases called gas-liquid-liquid-solid systems, which received less attention due to their complex situation. Numerical study of such complex systems is not easy and requires loads of computational effort. In this study, a discrete-continuous numerical model known as eXtended discrete element method (XDEM) is proposed to investigate the hydrodynamic behaviour of fluid phases passing through the packed bed of solid particles. This model is applied to the dripping zone of a blast furnace. In this zone, two distinct liquid phases, namely liquid iron and slag, flow through a pile of coke particles while exchanging momentum. In this work, besides the solid-fluid and gas-liquid interactions, the liquid-liquid interactions are also studied and the phases' mutual effects are discussed. In addition, a sensitivity study on the slag viscosity is performed, which shows the importance of liquid phase properties on the system behaviour. The results evaluation shows that the liquid iron accelerates the downward flow of the slag and the slag decelerates the downward flow of the liquid iron phase due to the resistance force caused by their relative velocity. [less ▲]

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See detailAnalysis of cancer related protein isoforms by mass spectrometry
Ancheva, Lina UL

Doctoral thesis (2018)

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See detailBisymmetric and quasitrivial operations: characterizations and enumerations
Devillet, Jimmy UL

E-print/Working paper (2018)

We investigate the class of bisymmetric and quasitrivial binary operations on a given set X and provide various characterizations of this class as well as the subclass of bisymmetric, quasitrivial, and ... [more ▼]

We investigate the class of bisymmetric and quasitrivial binary operations on a given set X and provide various characterizations of this class as well as the subclass of bisymmetric, quasitrivial, and order-preserving binary operations. We also determine explicitly the sizes of these classes when the set X is finite. [less ▲]

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See detailEinführungsvortrag anlässlich der Aufführung der Missa „Ave spes nostra" B-Dur op. 39 (1889) von Laurent Menager (1835-1902)
Sagrillo, Damien UL

Speeches/Talks (2018)

Der Förderkreis des Schröder-Hauses lädt ein zu einem besonderen musikalischen Ereignis: Der Universitäts-Kammerchor unter der Leitung von Hermann Freibott singt die Missa „Ave spes nostra" B-Dur op. 39 ... [more ▼]

Der Förderkreis des Schröder-Hauses lädt ein zu einem besonderen musikalischen Ereignis: Der Universitäts-Kammerchor unter der Leitung von Hermann Freibott singt die Missa „Ave spes nostra" B-Dur op. 39 (1889) von Laurent Menager (1835-1902). Er komponierte u.a. Chöre, Operetten, Blas-, Symphonie- und Kammerstücke sowie auch Messen. Eine kurze Einführung in das Werk gibt Prof. Dr. Damien Sagrillo von der Universität Luxembourg, der als Herausgeber der Werke Menagers ein ausgewiesener Experte für dessen Musik ist. Moderation: Prof. Dr. Friedhelm Brusniak Einführung: Prof . Dr. Damien Sagrillo Musik: Kammerchor der Uni Würzburg unter der Leitung von Hermann Freibott / Quelle: <http://frizz-wuerzburg.de/events/ave-spes-nostra-sei-gegruesst-unsere-hoffnung/> [less ▲]

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See detailDigitalisierung der Arbeit in Luxemburg - Teil 1
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2018)

Die Digitalisierung steht derzeit im Fokus der öffentlichen und politischen Debatte. Im Folgenden wird dargestellt, wie Arbeitnehmer in Luxemburg ihre Arbeit durch die Digitalisierung beeinflusst sehen ... [more ▼]

Die Digitalisierung steht derzeit im Fokus der öffentlichen und politischen Debatte. Im Folgenden wird dargestellt, wie Arbeitnehmer in Luxemburg ihre Arbeit durch die Digitalisierung beeinflusst sehen. Hierbei werden die verschiedenen Formen der Digitalisierung sowie die Angst durch den technischen Fortschritt seinen Arbeitsplatz zu verlieren näher beleuchtet. Manager und Führungskräfte, Arbeitnehmer in akademischen Berufen, Techniker sowie Bürokräfte konstatieren einen starken Einfluss der Digitalisierung auf ihre Arbeit. Diese Einschätzung fällt für Arbeitnehmer in Dienstleistungs- und in Handwerksberufen sowie für Bedienern von Anlagen und Hilfsarbeitskräfte moderater aus. Während Manager und Führungskräfte, sowie Arbeitnehmer in akademischen Berufen vor allem die Bedeutung von elektronischer Kommunikation und unterstützender elektronischer Geräte hervorheben, kommt für Techniker und Arbeitnehmer in Handwerksberufen auch noch das Arbeiten mit computergesteuerten Maschinen oder Robotern hinzu. Die mit der Digitalisierung und dem technischen Fortschritt häufig debattierte Angst vor Arbeitsplatzverlust ist insgesamt moderat ausgeprägt. Etwas stärker ist diese bei Arbeitnehmern der Altersgruppe ab 35 Jahren sowie bei Bedienern von Anlagen und Bürokräften ausgeprägt. [less ▲]

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See detailOptimierung und Charakterisierung einer mittels Laserstrahl gefügten Verbindung zwischen Aluminium und Polyamid 6.6
Lamberti, Christian UL

Doctoral thesis (2018)

The creation of strong joints between dissimilar materials and in particular between polymers and metals is one of the most often discussed topics in the fields of automotive, aerospace and transportation ... [more ▼]

The creation of strong joints between dissimilar materials and in particular between polymers and metals is one of the most often discussed topics in the fields of automotive, aerospace and transportation. Especially the combination of polyamide and aluminum is of highest interest, due to their market share as construction materials. New joining concepts are anticipated to deliver strong, durable and resource efficient structural components that are ideally suited for lightweight designs. However, current research activities have shown that the highly distinct material properties of these materials pose enormous challenges on the creation of hybrid structures. The cause that potentially enables the connection between the aluminum surface and the polymer is still not fully understood. The research objective of the presented work, therefore is, on the one hand, to create an optimal joint between aluminum and polyamide 6.6 using a laser beam to reach high shear strength for an industrial application. On the other hand, the presented work seeks to deliver a substantial contribution to furtherly understand the interaction between the polymer and the metal surface during the thermal joining. A laser-based joining method was developed that enables the researchers to overcome limitations of conventional processes, that is minimizing space requirements, making the application of additional gaskets obsolete, reaching high strength, saving weight and reducing processing time. The effectiveness of different surface pre-treatments has been studied, and the described optimization of this method has lead to an increase of the shear strength of the joints by more than 100 %. Laser ablation and the hydrothermal treatment of the metallic surface, before the joining operation, lead to the highest joint strength. The surface pre-treatment method of laser ablation delivered to transfer the gathered insights and experience from the laboratory to the industrial scale, due to its repeatability and reproducibility. The experiment mentioned above includes the use of production materials, such as aluminum with a higher sheet thickness of up to 1.48 mm and glass fiber reinforced polymer. Shear strength of 40 MPa was reached in quasi-static single lap shear tests. During dynamic testing, samples maintained 63 % of static breaking load after one million cycles. The hydrothermal treatment of the aluminum surface leads to a lower surface roughness of Ra = 1.58 µm in average as opposed to 4.90 µm after laser ablation. Due to the lower roughness values, the first-mentioned method was chosen to study the interaction. An XPS-analysis revealed a strong influence of the surface pre-treatment method on the chemical composition of the metal surface, which becomes noticeable by hydroxylation of the surface layer and is expressed by the oxide ratio (O/Al) and hydroxide ratio (OH/O). A high O/Al ratio of 2.36 and an OH/O ratio of 0.63 after the hydrothermal treatment is showing a strong increase of the amount of hydroxide in direct comparison to values of 35 % and 36 % of OH/O ratio after ethanol and hexane cleaning respectively. The question, as to which extent the presence of such hydroxide structures at the boundary layer of the aluminum influence the interaction between the metal surface and the polymer, was a subject matter of an additional FT-IR analysis. In case of the infrared spectra from thin polymer films on the hydrothermally treated surface, clear indications of interaction are visible. In direct comparison to the infrared spectra from polymer films on either ethanol or hexane cleaned surfaces, this interaction seems to increase nearby of the interface further. The interaction mentioned above appears at the carbonyl band and amine band as a shift of 4 cm-1 and 8 cm-1 and an increase of the full width at half maximum by 35 % respectively 40 %. Additional strong differences are visible at the molecule vibrations below 1,200 cm-1, which are typically assigned to both crystalline phases and amorphous phases of the polyamide. In case of the hydrothermal treatment, collected data indicates a polymorphous state inside the polymer films, which seems to become increasingly disordered close to the interface. On the contrary, spectra from the polymer films on ethanol and hexane pre-treated substrates show only marginal changes. Methods are proposed to build upon the results described in this work and refine distinct signs of the interaction. [less ▲]

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See detailEloge du manager amical
Granata, Julien; Geraudel, Mickaël UL

Article for general public (2018)

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See detailSustainable Building Transitions in Luxembourg and Freiburg: Local Meanings, Circumstances and Rationales
Preller Geb. Jung, Bérénice Cynthia UL

Doctoral thesis (2018)

Sustainable building has become a subject of high policy emulation to address sustainability challenges. Publications and interventions from international organisations concord in outlining the high share ... [more ▼]

Sustainable building has become a subject of high policy emulation to address sustainability challenges. Publications and interventions from international organisations concord in outlining the high share of greenhouse gas emissions produced by the building sector, while at the same time pointing towards the important leverage for sustainability interventions on the built environment. The realisation of sustainable building crosses serval functional domains: regulatory, economic, cultural, social, natural etc. It requires also to consider buildings in a comprehensive manner from their inception, construction, up to their use and eventual retrofit or demolition but also in relationship with their wider (urban) settings. And last but not least, it requires close interactions with a wide range of stakeholders with different interests and disciplinary perspectives. As a result, sustainable building transformations are a widely diversified agenda. Hence the primary interest, as well as objective of this work, has been to try to better grasp the causes and mechanisms that explain such large differentiation of sustainable building. Drawing on critical sustainable urban literature, I posit sustainable building as diversified because it is a situated and socially mediated object. Conceptually, the work engages with two approaches. First the literature on sustainable socio-technical transitions, in particular the Multi-Level Perspective. Its grounding in co-evolutionary and institutional thinking helps to comprehend the socio-material complexity of sustainable building across a broad range of dimensions and connections. In complementing, and following the adopted socially constructed stance, the work further looks at the discursive constructs used to argue in favour of the transformation towards sustainable building, as the performativity of discourse helps to explain why that change occurs. The operationalisation of the research inquires sustainable building transformations in two European urban areas, Luxembourg (LU) and Freiburg (D), that both focus on sustainable building transformations in their urban policy agenda. Using a mix of qualitative research methods (interviews, cooperative research workshops, and the discourse analysis of a text corpus), I look into detail at how sustainable building policies are played out and how their content varies in relation to the geographical context in which they are situated. Of particular interest to my research is to understand why the transitions towards sustainable building in Luxembourg and Freiburg is a certain way, following the ideologies and interpretations that underlay it. This focus allows to uncover similarities in both Luxembourg and Freiburg where sustainable building is dominantly addressed via technicalities, energy efficiency and green growth, thus tying onto the mainstreamed socio-economic paradigm, despite locally differentiated circumstances. [less ▲]

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See detailCONSEQUENCES OF EARLY LIFE STRESS FOR PAIN PROCESSING AND COPING WITH STRESS IN LATER LIFE: BEHAVIOURAL AND BIOCHEMICAL STUDIES IN THE RAT
Genty, Julien UL

Doctoral thesis (2018)

Stress is commonly defined as the response to a non-specific situation presenting a psychological and/or physical challenge. In order to react in an appropriate manner to environmental threats the body ... [more ▼]

Stress is commonly defined as the response to a non-specific situation presenting a psychological and/or physical challenge. In order to react in an appropriate manner to environmental threats the body will trigger a wide range of defence mechanisms. However cases where challenges are sustained and the individual does not have the ability to cope with the stress are nowadays believed to be a main factor for the onset and exacerbation of a broad range of disorders. Among these are psychiatric disorders such as depression but also pain affections. Pain is described by the International Association for the study of Pain (IASP) as an unpleasant sensory and emotional experience associated with actual or potential tissue damage. As for stress, this system aiming at preserving the body integrity can become defective and enhance pain sensitivity or foster the development of chronic pain. These two health problems categories each represent a considerable issue of public health. Indeed the World Health Organization (WHO) estimates that 27% of the European adult population had experienced at least one episode of mental disorder and the IASP reported that 19% of the pan-European population experienced chronic pain (Macfarlane, Pain 2016). Furthermore, chronic pain and stress-related disorders are greatly comorbid, having deleterious effects on the efficacy of treatments. Despite the raising awareness of clinical and pre-clinical research on their overlapping pathways, common mediators and interactions, the nature of the relationship between chronic pain conditions and stress-related disorders is not yet elucidated. The studies I undertook during my Ph.D. aimed to understand how chronic stress, with an emphasis on early-life stress, is linked to altered nociceptive transmission and to modified chronic pain vulnerability. Early life stress (ELS) was of particular interest as this period of life is subjected to an intense neuronal plasticity of notably stress and pain systems. Furthermore it is increasingly accepted that early life factors are linked to the susceptibility to develop chronic pain conditions in adulthood. As pain is a multidimensional system, I had to restrict my studies to one of the relay stations for the transmission of pain. In the context of chronic stress, most of the work was done on the brain circuits underlying the affective part of pain but little is known about the effect of chronic pain on spinal nociceptive processes. Since chronic stress is a broad phenomenon altering not only processing at the brain level, I focused my studies on spinal dorsal horn noxious transmission. The first stage of my work was to assess the impact of ELS on neuropathic pain, a type of chronic pain arising from nerve lesions. In a second step, I sought to determine if the results obtained in this first study were specific to the type of pain (neuropathic) or also were valid for another type of chronic pain, e.g. chronic inflammatory pain. The third study aimed to determine if ELS would predispose to enhanced vulnerability to stress exposure later in life and to concomitant alterations of chronic pain. To finish, during the last year of my Ph.D. I investigated the possible mechanisms underlying the behavioural results using pharmacological manipulations and initiated a separate project devoted to in vivo electrophysiological characterization of the response behaviour of nociceptive spinal dorsal horn neurons. In the following introduction, I will give an overview of the stress systems, focusing on the hypothalamo-pituitary adrenal (HPA) axis and early life stress. Then I will outline the different part of the pain system and concepts of central sensitization involved in chronic pain. [less ▲]

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See detailEvaluation à l’ère du numérique: continuité ou rupture?
Reuter, Bob UL; Meyers, Christian UL; Busana, Gilbert UL

Scientific Conference (2018, January 10)

Face aux nouveaux défis qui se posent à la société-monde du 21e siècle, les « techno-prophètes » présagent que la numérisation nous aidera à améliorer l’éducation des futures générations (Dräger & Müller ... [more ▼]

Face aux nouveaux défis qui se posent à la société-monde du 21e siècle, les « techno-prophètes » présagent que la numérisation nous aidera à améliorer l’éducation des futures générations (Dräger & Müller-Eiselt, 2015 ; Khan, 2013 ; Cuban, 2003). L’évaluation des apprentissages assistée par ordinateur deviendrait notamment plus efficiente, plus pratique, plus flexible, plus rapide, plus objective, plus accessible, plus sécurisée, plus juste et plus économe. Par contre celle-ci reste souvent dans la continuité de pratiques existantes (Substitution ou Augmentation dans le modèle SAMR de Ruben Puentedura, 2006), donc limitée à la reproduction de connaissances déclaratives et de procédures fixes. Les ordinateurs sont en effet mieux aptes à rapidement corriger les réponses des apprenants à des tests standardisés et fermés. De plus, pour nous la révolution numérique incarne plus un grand défi qu’une solution miracle pour l’évaluation des apprentissages (scolaires ou autres). En effet, dans un monde où la numérisation mène à une croissance exponentielle et à une diffusion ultra-rapide des informations et à leur accès de plus en plus libre et facile, il ne suffit plus d’accumuler des connaissances, ni de simplement les reproduire. Mais il faut être capable de savoir où aller chercher des informations, comment juger leur crédibilité et utilité et comment les utiliser pour résoudre des problèmes. L’évaluation des apprentissages ne pourra donc plus se limiter à mesurer la capacité des élèves à mémoriser et à reproduire des informations mais devra s’aligner sur les nouveaux objectifs d’une éducation préparant les futures générations à affronter les défis d’un monde globalisé et connecté (cf. modèle des 21st century skills; Trilling & Fadel, 2009). La question fondamentale qui se posera pour l’évaluation des apprentissages sera celle de savoir comment évaluer des compétences (savoir, savoir-faire et savoir-être) complexes, dynamiques et changeantes. La question de l’utilisation des technologies numériques à des fins d’évaluation nous semble donc secondaire par rapport à la question de la transformation de l’évaluation afin qu’elle nous permette de répondre aux défis de la révolution civilisationnelle provoquée par la présence des technologies numériques et leur expansion irrémédiable dans nos pratiques culturelles, sociales, économiques, politiques et pédagogiques quotidiennes. Dans cette communication nous ne viserons pas nécessairement à fournir des réponses toutes faites, mais à stimuler le débat sur les relations mutuelles entre révolution numérique et évaluation en milieu scolaire, en termes d’innovations évolutives ou disruptives (Christensen, Johnson & Horn, 2008). [less ▲]

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See detailTHE CAPACITY FOR COMPLIANCE WITHIN EU MULTILEVEL ADMINISTRATION: THE CASE OF THE BANKING UNION’S SINGLE SUPERVISORY MECHANISM (SSM)
Gren, Jakub UL

Doctoral thesis (2018)

This dissertation offers a deep political science insight into the functioning of the EU new multilevel administrative system governing the micro-prudential supervision of credit institutions operating in ... [more ▼]

This dissertation offers a deep political science insight into the functioning of the EU new multilevel administrative system governing the micro-prudential supervision of credit institutions operating in the Single Market. It aims to explain the conditions affecting the formal top-bottom compliance expectation within this multilevel system. In doing so, it engages in the institutional analysis of the organisational and operational design of the Single Supervisory Mechanism (SSM). [less ▲]

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See detailParlements et Gouvernance économique européenne: Comparaison de la situation en Allemagne, en Belgique, en France, en Suisse et au Luxembourg, rapport pour la Chambre des Députés du Luxembourg
Poirier, Philippe UL

Report (2018)

Gouvernance économique européenne : Comparaison de la situation en Allemagne, en Belgique, en France, en Suisse et au Luxembourg, rapport pour la Chambre des Députés du Luxembourg, dans une perspective ... [more ▼]

Gouvernance économique européenne : Comparaison de la situation en Allemagne, en Belgique, en France, en Suisse et au Luxembourg, rapport pour la Chambre des Députés du Luxembourg, dans une perspective néo-institutionnaliste [less ▲]

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See detailThe effect of liquid bridge model details on the dynamics of wet fluidized beds
Wu, Mingqiu UL; Khinast, Johannes; Radl, Stefan

in AIChE Journal (2018), 64(2), 437-456

Wet fluidized beds of particles in small periodic domains are simulated using the CFD-DEM approach. A liquid bridge is formed upon particle-particle collisions, which then ruptures when the particle ... [more ▼]

Wet fluidized beds of particles in small periodic domains are simulated using the CFD-DEM approach. A liquid bridge is formed upon particle-particle collisions, which then ruptures when the particle separation exceeds a critical distance. The simulations take into account both surface tension and viscous forces due to the liquid bridge. We perform a series of simulations based on different liquid bridge formation models: (1) the static bridge model of Shi and McCarthy, (2) a simple static version of the model of Wu et al., as well as (3) the full dynamic bridge model of Wu et al. We systematically compare the differences caused by different liquid bridge formation models, as well as their sensitivity to system parameters. Finally, we provide recommendations for which systems a dynamic liquid bridge model must be used, and for which application this appears to be less important [less ▲]

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See detailCommissions de surperformance et protection de l'investisseur
Riassetto, Isabelle UL

in Bulletin Joly Bourse (2018)

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