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See detailIntersymbol and Intercarrier Interference in OFDM Transmissions Through Highly Dispersive Channels
Alves Martins, Wallace UL; Cruz-Roldán, Fernando; Moonen, Marc et al

in Proc. of the 27th European Signal Processing Conference (EUSIPCO-2019) (2019, September)

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Peer Reviewed
See detailOn the Use of Vertex-Frequency Analysis for Anomaly Detection in Graph Signals
Lewenfus, Gabriela; Alves Martins, Wallace UL; Chatzinotas, Symeon UL et al

in Anais do XXXVII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT 2019) (2019, September)

Detailed reference viewed: 28 (1 UL)
See detailBelgien und Deutschland: eine kleine Beziehungsgeschichte
Brüll, Christoph UL

E-print/Working paper (2019)

Detailed reference viewed: 32 (2 UL)
See detailDimensional Comparison Effects on Facets of Subject-Specific Anxieties: A Nested Modelling Approach
Talic, Irma UL; Sparfeldt, Jörn; Möller, Jens et al

Scientific Conference (2019, August 16)

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See detailDie Entwicklung der Entfremdung vom Lernen in der unteren Sekundarstufe in Luxemburg: Der Beitrag differenzieller schulischer Lern- und Entwicklungsmilieus
Grecu, Alyssa Laureen UL

Doctoral thesis (2019)

This dissertation provides research on alienation from learning in differential learning and developmental milieus (vgl. Baumert/Stanat/Watermann 2006) within the strongly stratified educational system of ... [more ▼]

This dissertation provides research on alienation from learning in differential learning and developmental milieus (vgl. Baumert/Stanat/Watermann 2006) within the strongly stratified educational system of Luxembourg. Alienation from learning is defined as a student´s generalised negative orientation towards learning (Hascher/Hadjar 2018, S. 179) and collocates with severe consequences including school dropout (see Hascher/Hagenauer 2010, S. 220). The study focusses on the question of how the development of alienation from learning differs between the differential learning and developmental milieus within Luxembourgish secondary school tracks. The conceptual framework is based on the perspective of differential learning and developmental milieus (Baumert/Stanat/Watermann 2006), the theory of school culture (Helsper 2008; Kramer/Thiersch/Ziems 2015) and further culture sociological and resonance pedagogical approaches (Willis 1978; Beljan 2017). Combining research on school culture and research on school alienation, this works examines the interplay between school culture and individual students and its impact on alienation from learning. Conceptualized as a mixed method study, this research aims for a holistic picture on alienation from learning by combining quantitative and qualitative approaches. The quantitative part is based on a three-year panel study with students from all secondary school tracks (grade 7-9). Employing random effects models and growth curves models it investigated the degree and development of alienation from learning over time. Qualitative group discussions and interviews with classes (grade 7) and their teachers from the high-achieving and low-achieving school track (corresponding to grammar school and the lowest secondary school track) were conducted to research how schools´ specific demands contribute to alienation from learning. The method employed in the qualitative analysis was the sequence-analytical habitus reconstruction approach. Quantitative analysis reveals a moderate but increasing degree of alienation from learning in all secondary school tracks from grade 7 to 9. Therefore, alienation from learning develops similarly in all secondary school tracks. Students from the high-achieving ES-Track show the strongest degree of alienation from learning whereas students from the low-achieving Modulaire-Track show the lowest degree of alienation from learning. Qualitative analysis identifies the high-achieving and low-achieving secondary school tracks as differential learning and developmental milieus characterized by diverging educational demands and standards on the class level. Consequently, when students’ orientations conflict with the school´s demands and offers there is a high risk for them to develop alienation. Track-specific possibilities and risks were identified with regard to bonding and alienation. Strong achievement orientation, theoretical educational content and highly standardised educational settings may foster alienation from learning depending on the students´ individual competencies and orientations. [less ▲]

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See detailImplementing intelligence facets as predictors into the generalised I/E model
Hausen, Jennifer UL; Möller, Jens; Greiff, Samuel UL et al

Scientific Conference (2019, August 13)

The internal/external (I/E) frame of reference model postulates that achievement influences the formation of academic self-concept (ASC) via social and dimensional comparison processes. Its recent ... [more ▼]

The internal/external (I/E) frame of reference model postulates that achievement influences the formation of academic self-concept (ASC) via social and dimensional comparison processes. Its recent extension as the generalized I/E model allows further domains than math and verbal achievement. However, intelligence facets as an indicator of achievement have been neglected within the GI/E model framework. Therefore, the purpose of this research is to explore the influences of three intelligence facets (verbal, numerical, figural) on domain-specific ASCs beyond grades and achievement scores. We drew on N=382 German students to analyze verbal, numerical, and figural intelligence, German and math achievement, self-reported grades and ASCs in four domains. We performed a structural equation model using Mplus with grades, achievement scores and intelligence facets specified as predictors and domain-specific ASCs as criteria. Positive paths were found from math, physics, German and English grade to their corresponding self-concepts. A positive path was found between physics grade and math ASC while negative paths were found from English grade to math and physics ASC and from math grade to German, physics and English ASC. The path coefficients from math achievement to math ASC as well as to physics ASC were positive; German achievement was negatively related to math ASC. Lastly, numerical intelligence was positively related to physics ASC, and verbal intelligence was positively related to English ASC. Thus, intelligence, specifically numerical and verbal intelligence, seem to be valid predictors of domain-specific ACSs beyond grades and achievement test scores. [less ▲]

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See detailThe Long 19th Century of Music in Luxembourg. Music History, Sociology and Ethnology
Sagrillo, Damien UL

Scientific Conference (2019, August 09)

Music historiography is multifaceted. The historiography of music in Luxembourg is divided into various aspects. Firstly, it is part of regional music research in Europe and, as far as Luxembourg is ... [more ▼]

Music historiography is multifaceted. The historiography of music in Luxembourg is divided into various aspects. Firstly, it is part of regional music research in Europe and, as far as Luxembourg is concerned, national music research. A first point of view is music ethnology: citizens, nations have their songs and pass them on orally across national and linguistic borders and over generations. Folksongs originate from the music of the people, and patriotic music in Luxembourg is often music based on folksong styles. A further aspect of music in Luxembourg is that art music originated since the independence of the Grand Duchy in the 19th century. Sociological considerations deal with community music in Luxembourg. The starting point is a more liberal constitution, which for the first time offered citizens the right of assembly. Finally, my lecture will offer some insights of musical activities of people who left their homeland. [less ▲]

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See detailBad representations and homotopy groups of Character Varieties
Guerin, Clément UL; Lawton, Sean; Ramras, Daniel

E-print/Working paper (2019)

Let G be a connected, reductive, complex affine algebraic group, and let Xr denote the moduli space of G-valued representations of a rank r free group. We first characterize the singularities in Xr ... [more ▼]

Let G be a connected, reductive, complex affine algebraic group, and let Xr denote the moduli space of G-valued representations of a rank r free group. We first characterize the singularities in Xr resolving conjectures of Florentino-Lawton. In particular, we compute the codimension of the orbifold singular locus using facts about Borel-de Siebenthal groups. We then use this codimension to calculate some higher homotopy groups of the smooth locus of Xr, proving conjectures of Florentino-Lawton-Ramras. Lastly, using the earlier analysis of Borel-de Siebenthal groups, we prove a conjecture of Sikora about CI Lie groups. [less ▲]

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See detailThe History of the Russian Worker Colony in Wiltz in 1920s-1930s
Ganschow, Inna UL

Speeches/Talks (2019)

The guided tour in Wiltz and especially at the former leather factory "Ideal", where around 200 Russian migrants were working in the 1920s-1930s, was offered for the young Russian speaking audience of ... [more ▼]

The guided tour in Wiltz and especially at the former leather factory "Ideal", where around 200 Russian migrants were working in the 1920s-1930s, was offered for the young Russian speaking audience of scouts. Besides the historical context and the view on the migration "from outside" the tour offered a meeting with a descendant of the Russian emigrants in Wiltz and gave the possibility to hear about the migration from "within". [less ▲]

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See detailOn Recent Activities at GNSS@TG Stations in the South Atlantic Ocean and the Tracking of Hurricanes Using GNSS
Teferle, Felix Norman UL

Presentation (2019, August 07)

Guest lecture to third year students in Geomatics and Geoinformation at the University of Cape Town. The topics covered the geodetic activities in the South Atlantic Ocean and the tracking of hurricanes ... [more ▼]

Guest lecture to third year students in Geomatics and Geoinformation at the University of Cape Town. The topics covered the geodetic activities in the South Atlantic Ocean and the tracking of hurricanes both involving GNSS. The contents were recently presented orally at IUGG 2019 and ISAES 2019. [less ▲]

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See detailChapter 18: Luxembourg
Sinnig, Julia UL

in Maisto, Guglielmo (Ed.) New Trends in the Definition of Permanent Establishment (2019, August)

Detailed reference viewed: 58 (2 UL)
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See detailSemi-blind Data-Selective and Multiple Threshold Volterra Adaptive Filtering
Barboza da Silva, Felipe; Alves Martins, Wallace UL

in Circuits, Systems, and Signal Processing (2019)

This work proposes the use of data-selective semi-blind schemes in order to decrease the amount of data used to train the adaptive filters that employ Volterra series, while reducing its computational ... [more ▼]

This work proposes the use of data-selective semi-blind schemes in order to decrease the amount of data used to train the adaptive filters that employ Volterra series, while reducing its computational complexity. It is also proposed a data-selective technique that exploits the structure of Volterra series, employing a different filter for each of its kernels. The parameter vector of these filters grows as the order of the kernel increases. Therefore, by assigning larger error thresholds to higher-order filters, it is possible to decrease their update rates, thus reducing the overall computational complexity. Results in an equalization setup indicate that both proposals are capable of achieving promising results in terms of mean square error and bit error rate at low computational complexity, and in the case of semi-blind algorithms, using much less training data. [less ▲]

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See detailWho were "the first Russians" in Luxembourg?
Ganschow, Inna UL

Speeches/Talks (2019)

"The first Russian" in Luxembourg, which arrived in the 1920ths, were not the first ones. The pre-history of the Russian presence in the Grand Duchy before WWI and the further development regarding the ... [more ▼]

"The first Russian" in Luxembourg, which arrived in the 1920ths, were not the first ones. The pre-history of the Russian presence in the Grand Duchy before WWI and the further development regarding the two world wars and the post-war situation were the topic of this radio interview. [less ▲]

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See detailStudy of nanopulsed discharges for plasma-polymerization: experimental characterization and theoretical understanding of growth mechanisms in the deposition of functional polymer thin films
Loyer, François UL

Doctoral thesis (2019)

Plasma processes are highly versatile methods able to promote the formation of thin films from a vast variety of compounds thanks to the numerous energetic species they generate. Notably, plasma-enhanced ... [more ▼]

Plasma processes are highly versatile methods able to promote the formation of thin films from a vast variety of compounds thanks to the numerous energetic species they generate. Notably, plasma-enhanced chemical vapor deposition (PECVD) processes have already led to the simultaneous synthesis and deposition of a wide variety of organic functional materials. Reciprocally, the many reactive species composing the plasma induce a non-negligible number of side reactions, yielding altered chemistry compared to conventional polymerization processes. Therefore, there is a strong need for controlled methods promoting conventional polymerization pathway in plasma-based processes to increase their range of application. To this end, the atmospheric-pressure plasma-initiated chemical vapor deposition (AP-PiCVD) process was developed, differing from classical PECVD by its initiation source. AP-PiCVD relies on square-wave nanopulsed discharges with single ultra-short plasma on times (t_on ≈ 100 ns) and long plasma off-times (t_off = 0.1 – 100 ms) rather than alternative current sources yielding long and repeated discharges (t_on = 10 µs). Methacrylate monomers initiated by nanopulsed discharges highlighted a shift of growth mechanisms from classical PECVD pathways (plasma-polymerization) to conventional free-radical polymerization. Notably, the growth of polymer layers with an extremely high retention of the monomer’s chemistry and unprecedented molecular weights for an atmospheric-pressure plasma process is demonstrated at long plasma off-times. Moreover, a transition from gas phase to surface growth mechanisms is observed, allowing the deposition of conformal coatings similarly to low-pressure alternative chemical vapor deposition processes. A thorough investigation of the thin films’ chemistry confirms the conventional nature of the layers grown by AP-PiCVD and shed light upon the growth mechanisms in low-frequency nanosecond pulsed plasmas. While the on-time induces the formation of free radicals from the monomers’ fragmentation which are able to initiate and terminate the chain addition process, conventional polymerization mechanisms are strongly promoted during the off-time yielding linear polymer core. Interestingly, new insights on selective initiation mechanisms based on sacrificial functions for an enhanced control of the molecular fragmentation are put forward and discussed. The development of a model describing the kinetic of pulsed plasma was carried out and correlated with experimental observations, providing deeper understanding of the interaction between the gas phase and the surface. The extraction of important physical parameters for the description of the growth kinetics in AP-PiCVD is demonstrated and their significance discussed. Using the fundamental knowledge developed on nanosecond pulsed plasma-initiated polymerization mechanisms, thermoresponsive copolymer layers grown by AP-PiCVD are reported for the first time. The properties of the layers are evaluated and related to their chemistry, allowing the determination of an optimal co-monomers ratio to integrate both of their individual properties as a unique functional thin film. [less ▲]

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See detailHistory of the Russian-Orthodoxe Community Luxembourgs (1929-2019)
Ganschow, Inna UL

Speeches/Talks (2019)

The presentation of the history of Russian-orthodox church Luxembourgs gave a panoramic view of 1. several personalities, responsible for the founding of the Russian church community, 2. the key dates ... [more ▼]

The presentation of the history of Russian-orthodox church Luxembourgs gave a panoramic view of 1. several personalities, responsible for the founding of the Russian church community, 2. the key dates, which played a significant role in keeping the community and 3. the events which are still defining the community life. [less ▲]

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See detailSüdkaukasier in Luxemburg zwischen zwei Weltkriegen
Ganschow, Inna UL

Conference given outside the academic context (2019)

The presentation of the diversity among the migrants from Caucasus after the WWI and between two world wars gave a better understanding of the migration motivations of the political refugees from Russia.

See detailThe Unknown Bel-Val
Ganschow, Inna UL

Speeches/Talks (2019)

The speech was held as a guided tour through the university campus and surroundings of Belval in Esch-sur-Alzette. Looking for the traces of camps and other presence of ca. 4.000 soviet forced labourers ... [more ▼]

The speech was held as a guided tour through the university campus and surroundings of Belval in Esch-sur-Alzette. Looking for the traces of camps and other presence of ca. 4.000 soviet forced labourers engaged by the steel industry of Luxembourg in 1942-1944, the audience was invited to discuss about the collective memory and its selectiveness. [less ▲]

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See detailLaser polishing of Aluminum and Polyamide for dissimilar laser welded assemblies
Amne Elahi, Mahdi UL; Koch, Marcus; Plapper, Peter UL

Scientific Conference (2019, June 27)

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See detail5. NetzWerkTreffen "Wie sozial ist die Soziale Arbeit"
Böwen, Petra UL; Flammang, Manou Laure UL

Conference given outside the academic context (2019)

Die Netzwerktreffen richten sich an Absolventen der Studiengänge Bachelor in Sozial- und Erziehungswissenschaften und Zertifikat LernCoaching. Das PraxisBüro konzipiert und organisiert die Treffen und ... [more ▼]

Die Netzwerktreffen richten sich an Absolventen der Studiengänge Bachelor in Sozial- und Erziehungswissenschaften und Zertifikat LernCoaching. Das PraxisBüro konzipiert und organisiert die Treffen und ebnet damit den Weg für weitere Plattformen und Netzwerkmöglichkeiten zwischen Wissenschaft und Praxis. Aktuelle Themen werden diskutiert und theoretisch und praktisch aufbereitet. [less ▲]

Detailed reference viewed: 22 (4 UL)