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See detailMagnetization reversal in Nd-Fe-B based nanocomposites as seen by magnetic small-angle neutron scattering
Bick, Jens-Peter UL; Honecker, Dirk UL; Döbrich, Frank UL et al

in Applied Physics Letters (2013), 102(2), 0224151-0224155

We have studied the magnetization-reversal process of a Nd2Fe14B/Fe3B nanocomposite using small-angle neutron scattering. Based on the computation of the autocorrelation function of the spin misalignment ... [more ▼]

We have studied the magnetization-reversal process of a Nd2Fe14B/Fe3B nanocomposite using small-angle neutron scattering. Based on the computation of the autocorrelation function of the spin misalignment, we have estimated the characteristic size lC of spin inhomogeneities around the Nd2Fe14B nanoparticles. The quantity lC approaches a constant value of about 12.5 nm ( ∼ average Nd2Fe14B particle radius) at 14 T and takes on a maximum value of about 18.5 nm at the coercive field of −0.55 T. The field dependence of lC can be described by a model that takes into account the convolution relationship between the nuclear and the magnetic microstructure. [less ▲]

Detailed reference viewed: 147 (28 UL)
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See detailMagnetoplasmonic control of plasmonic vortices
Maccaferri, Nicolò UL; Gorodetski, Yuri; Toma, Andrea et al

in Applied Physics Letters (2017), 111(20), 201104

We theoretically investigate the generation of far-field propagating optical beams with a desired orbital angular momentum by using an archetypical magnetoplasmonic tip surrounded by a gold spiral slit ... [more ▼]

We theoretically investigate the generation of far-field propagating optical beams with a desired orbital angular momentum by using an archetypical magnetoplasmonic tip surrounded by a gold spiral slit. The use of a magnetic material can lead to important implications once magneto-optical activity is activated through the application of an external magnetic field. The physical model and the numerical study presented here introduce the concept of magnetically tunable plasmonic vortex lens, namely a magnetoplasmonic vortex lens, which ensures a tunable selectivity in the polarization state of the generated nanostructured beam. The presented system provides a promising platform for a localized excitation of plasmonic vortices followed by their beaming in the far-field with an active modulation of both light's transmission and helicity. Published by AIP Publishing. [less ▲]

Detailed reference viewed: 58 (5 UL)
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See detailMagnetoplasmonic crystals based on anisotropic nanoantennas
Bergamini, Luca; Maccaferri, Nicolo UL; Pancaldi, Matteo et al

in Conference on Lasers and Electro-Optics (2016)

By synergically combining experiments and simulations, we show how the excitation of lattice surface modes in ordered arrays of magnetic and optically-anisotropic nanoantennas leads to a highly enhanced ... [more ▼]

By synergically combining experiments and simulations, we show how the excitation of lattice surface modes in ordered arrays of magnetic and optically-anisotropic nanoantennas leads to a highly enhanced and tunable Fano-like modulation of the magneto-plasmonic response. [less ▲]

Detailed reference viewed: 62 (3 UL)
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See detailMagnetoplasmonic Design Rules for Active Magneto-Optics
Lodewijks, Kristof; Maccaferri, Nicolò UL; Pakizeh, Tavakol et al

in Nano Letters (2014), 14(12), 7207-7214

Light polarization rotators and nonreciprocal optical isolators are essential building blocks in photonics technology. These macroscopic passive devices are commonly based on magneto-optical Faraday and ... [more ▼]

Light polarization rotators and nonreciprocal optical isolators are essential building blocks in photonics technology. These macroscopic passive devices are commonly based on magneto-optical Faraday and Kerr polarization rotation. Magnetoplasmonics, the combination of magnetism and plasmonics, is a promising route to bring these devices to the nanoscale. We introduce design rules for highly tunable active magnetoplasmonic elements in which we can tailor the amplitude and sign of the Kerr response over a broad spectral range. [less ▲]

Detailed reference viewed: 64 (1 UL)
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See detailMagnetotransport signatures of three-dimensional topological insulator nanostructures
Moors, Kristof UL; Schüffelgen, P.; Rosenbach, D. et al

in Physical Review. B (2018), 97(24), 245429

We study the magnetotransport properties of patterned 3D topological insulator nanostructures with several leads, such as kinks or Y-junctions, near the Dirac point with analytical as well as numerical ... [more ▼]

We study the magnetotransport properties of patterned 3D topological insulator nanostructures with several leads, such as kinks or Y-junctions, near the Dirac point with analytical as well as numerical techniques. The interplay of the nanostructure geometry, the external magnetic field, and the spin-momentum locking of the topological surface states lead to a richer magnetoconductance phenomenology as compared to straight nanowires. Similar to straight wires, a quantized conductance with perfect transmission across the nanostructure can be realized across a kink when the input and output channels are pierced by a half-integer magnetic flux quantum. Unlike for straight wires, there is an additional requirement depending on the orientation of the external magnetic field. A right-angle kink shows a unique π -periodic magnetoconductance signature as a function of the in-plane angle of the magnetic field. For a Y-junction, the transmission can be perfectly steered to either of the two possible output legs by a proper alignment of the external magnetic field. These magnetotransport signatures offer new ways to explore topological surface states and could be relevant for quantum transport experiments on nanostructures which can be realized with existing fabrication methods. [less ▲]

Detailed reference viewed: 95 (6 UL)
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See detailThe Magnifying Glass and the Kaleidoscope. Analysing Scale in Digital History and Historiography
Armaselu, Florentina UL

Scientific Conference (2018, June 27)

What is the meaning of scale in historical writings and migration narratives? To what extent can digital tools and methods assist the detection of scale-related patterns in these categories of documents ... [more ▼]

What is the meaning of scale in historical writings and migration narratives? To what extent can digital tools and methods assist the detection of scale-related patterns in these categories of documents? May this enquiry be formalised and eventually turned into a system for scale analysis in texts? To address these questions, the paper combines theoretical background from historical, historiographical, linguistic and literary studies with digital tools and methods for text analysis and visualisation. The project is in an early phase of development; theoretical hypotheses and preliminary experiments for a system dedicated to scale analysis in historical/historiographical texts are presented. Evoking the metaphors of the magnifying glass and the kaleidoscope, the system is intended to allow both scale-related patterns detection and perspective change. [less ▲]

Detailed reference viewed: 47 (14 UL)
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See detailMAGRID - FROM DEVELOPING A LANGUAGE-NEUTRAL LEARNING APPLICATION TO PREDICTIVE LEARNING ANALYTICS
Pazouki, Tahereh UL

Doctoral thesis (2020)

Mathematical proficiency serves as one of the foundations that must be solid if learners are to succeed in the classroom. However, the hierarchical nature of mathematical development means that basic math ... [more ▼]

Mathematical proficiency serves as one of the foundations that must be solid if learners are to succeed in the classroom. However, the hierarchical nature of mathematical development means that basic math skills must form the groundwork for subsequent mathematical constructs. As a matter of fact, a fragile mathematical foundation leads to some unavoidable roadblocks further ahead. That being said, early childhood education and the preschool years are highly foundational, and thus, it is crucial to train early mathematical abilities. If we bear in mind that teaching and testing in schools rely on communication between the teacher and learner, fluency in the language of instruction exerts a tangible influence on this process. Consequently, students who are not proficient in the language of instruction are set up to have a poor mathematical foundation that will likely hold them back in relation to their peers. This is a shortcoming that can drive a gap between learners within heterogeneous school settings, which becomes a hurdle for students and teachers alike. Because digital devices are now more available and present in today's classrooms, digital interventions (e.g., computer software and tablet applications) are one channel that can be used to bridge such a gap through the introduction of language-neutral training and testing programs. Students who are not pro ficient in the language of instruction would be enabled to acquire and maintain the mastery of early mathematical skills when the emphasis is placed on visual content rather than language skills in the teaching of mathematical concepts. Moreover, when digital devices are used as learning platforms, learners' interactions (behavior) with the training content can be recorded in log files. Analyzing the log data can provide teachers with detailed information on learners' progress, which may ultimately remove the necessity to administer tests and examinations. The present dissertation explores the extent of educational technologies in the teaching and testing of early math abilities. In this regard, we address two main areas of focus in research: The first one is to examine the possibility of developing a language-neutral application for learning mathematical abilities for young learners so that they do not need to depend on their language proficiency to acquire mathematical skills. Findings of empirical studies have demonstrated that students who participated in the early mathematics training program using the MaGrid application performed significantly better on various measures of early mathematical abilities. Therefore, the MaGrid application can provide an efficient way to reinforce the math knowledge of all preschoolers, including segments (second-language learners) that have traditionally been underserved. The second focus is on studying the possibility of inferring young learners level of mathematical competencies on the basis of their interactions in a learning platform. The idea behind analyzing log data of learners behavior was to evaluate the alternative approach (behavioral-based assessment) to formative assessment for measuring students improvements and competency levels. Along these lines, we derived system-specific behavioral indicators using the presented systematic approach, and then we evaluated the predictive power behind them. Findings illustrate that assessing learners' level of knowledge could be carried out through the analysis of traces students leave in an e-learning environment and without interrupting their learning process. Results further unveil how digital devices can be used in schools to enhance learning outcomes. [less ▲]

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See detailMaGrid: A Language-Neutral Early Mathematical Training and Learning Application
Pazouki, Tahereh UL; Cornu, Véronique UL; Sonnleitner, Philipp UL et al

in International Journal of Emerging Technologies in Learning (2018), 13(08), 4-18

Given that the use of educational technologies is increasingly popular in kindergarten and among young students, these technologies have been shown to be able to solve the difficulties (existing in school ... [more ▼]

Given that the use of educational technologies is increasingly popular in kindergarten and among young students, these technologies have been shown to be able to solve the difficulties (existing in school) that are either not possible to be solved in traditional schooling or cost a lot of time and resources. In this paper, we present a pedagogical training and learning application called MaGrid (Math on Grid), which has been developed to foster early mathematical skills in pre-schoolers. MaGrid is a tablet-based application, which provides a wide range of training tasks targeting fundamental mathematical concepts for the preschool level. The language-neutral property of MaGrid is an innovative aspect that makes MaGrid different from existing mathematical training applications. This property may reduce the barrier of language from mathematical education for second language learners encountered in multilingual school settings. MaGrid allows individual learning in an interactive way and provides real-time feedback. Moreover, MaGrid is capable of recording students’ activities while working on the training tasks, which can help teachers and parents keep track of a student’s progress in different tasks and observe potential training-related improvements over time. Finally, we describe a series of experiments carried out using the MaGrid application during special training and assessment sessions in several preschools in Luxembourg. [less ▲]

Detailed reference viewed: 354 (53 UL)
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See detailMahalanobis-based Adaptive Nonlinear Dimension Reduction
Aouada, Djamila UL; Baryshnikov, Yuliy; Krim, Hamid

in 20th International Conference on Pattern Recognition (2010)

Detailed reference viewed: 95 (1 UL)
See detailMahara@bsce.uni.lu: expériences vécues et leçons apprises
Reuter, Robert UL

Presentation (2014, March 13)

Detailed reference viewed: 47 (10 UL)
See detail"Le maillage de l'oeuvre. Avant Propos"
Raus, Tonia UL; Glesener, Jeanne UL

in Glesener, Jeanne; Raus, Tonia (Eds.) Jean Portante. Le travail de l'écriture ou la mémoire à l'oeuvre (2019)

Detailed reference viewed: 6 (0 UL)
See detailLe maillage de l'oeuvre. Avant-propos
Glesener, Jeanne UL; Raus, Tonia

in Glesener, Jeanne; Raus, Tonia (Eds.) Jean Portante. Le travail de l'écriture ou la mémoire à l'oeuvre. (2019)

Detailed reference viewed: 9 (1 UL)
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See detailMainport und Hinterland unter Druck. Wettbewerbsdynamik und Hafen-Regionalisierung – das Beispiel Antwerpen/Belgien
Hesse, Markus UL

in Zeitschrift für Wirtschaftsgeographie (2010), 54(3-4), 166-179

Detailed reference viewed: 134 (2 UL)
See detailMainstreaming the Social Dimension into EU Economic Governance: Expectations, Achievements and Future Prospects
Muñoz, Susana UL

in Masini, Fabio (Ed.) Economic Governance and Social Policies. A European Perspective (2019)

This paper aims to take stock of the Union's action to strengthen its social dimension with a focus on its impact on European economic governance. It provides a legal and political assessment of the ... [more ▼]

This paper aims to take stock of the Union's action to strengthen its social dimension with a focus on its impact on European economic governance. It provides a legal and political assessment of the European Pillar of Social Rights and examines the main achievements and/or shortcomings as regards its implementation. The Pillar's foundational role to reinforce socioeconomic governance in the EU and the challenges ahead are finally addressed. [less ▲]

Detailed reference viewed: 39 (3 UL)
See detailMainstreaming, Social Reproduction, and the Continuing Search for Integration
Powell, Justin J W UL

Bachelor/master dissertation (1992)

Detailed reference viewed: 78 (11 UL)
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See detailMaintaining a Sense of Control in Autonomous Vehicles via Auditory Feedback
Beattie, David; Lynne, Baillie; Halvey, Martin et al

Scientific Conference (2013, September)

This paper presents the findings from an observational field study conducted with 8 car drivers. The study attempted to create a taxonomy of sounds that present information to people whilst driving. We ... [more ▼]

This paper presents the findings from an observational field study conducted with 8 car drivers. The study attempted to create a taxonomy of sounds that present information to people whilst driving. We also aimed to determine whether participants noticed these sounds as they occurred and whether they paid attention to them. Furthermore, we asked the participants subjective questions regarding particular sonic attributes and their ability to catch driver’s attention. It was concluded that although certain sounds occur regularly, differing levels of attention are given to each depending on the information they present. Our study also revealed that while all sonic attributes play an impact in catching driver’s attention, some aspects are more noticeable than others. We conclude with a discussion of our future directions with regards to the findings obtained from our observational field study and outline the plan for our next study. [less ▲]

Detailed reference viewed: 131 (6 UL)
See detailMaintaining cognitive function starts early in life
Leist, Anja UL

Speeches/Talks (2016)

Detailed reference viewed: 47 (1 UL)
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See detailMaintaining your immune system--one method for enhanced longevity.
Wollscheid-Lengeling, Evi; Muller, Rolf-Joachim; Balling, Rudi UL et al

in Science of Aging Knowledge Environment [=SAGE KE] (2004), 2004(1), 2

The immune system is an important evolutionary invention to battle invaders in young and old organisms. Successful aging in humans who achieve nonagenarian status and beyond depends on how the immune ... [more ▼]

The immune system is an important evolutionary invention to battle invaders in young and old organisms. Successful aging in humans who achieve nonagenarian status and beyond depends on how the immune system changes over time. Whether certain immune parameters vary with increased age is influenced by the genotype and lifestyle of the individual. [less ▲]

Detailed reference viewed: 84 (0 UL)