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See detailIntravalley Spin-Flip Relaxation Dynamics in Single-Layer WS2
Wang, Zilong; Molina-Sanchez, Alejandro; Altmann, Patrick et al

in NANO LETTERS (2018), 18(11), 6882-6891

In monolayer (1L) transition metal dichalcogenides (TMDs) the valence and conduction bands are spin-split because of the strong spin-orbit interaction. In tungsten-based TMDs the spin-ordering of the ... [more ▼]

In monolayer (1L) transition metal dichalcogenides (TMDs) the valence and conduction bands are spin-split because of the strong spin-orbit interaction. In tungsten-based TMDs the spin-ordering of the conduction band is such that the so-called dark excitons, consisting of electrons and holes with opposite spin orientation, have lower energy than A excitons. The transition from bright to dark excitons involves the scattering of electrons from the upper to the lower conduction band at the K point of the Brillouin zone, with detrimental effects for the optoelectronic response of 1L-TMDs, since this reduces their light emission efficiency. Here, we exploit the valley selective optical selection rules and use two-color helicity-resolved pump-probe spectroscopy to directly measure the intravalley spin-flip relaxation dynamics in 1L-WS2. This occurs on a sub-ps time scale, and it is significantly dependent on temperature, indicative of phonon-assisted relaxation. Time-dependent ab initio calculations show that intravalley spin-flip scattering occurs on significantly longer time scales only at the K point, while the occupation of states away from the minimum of the conduction band significantly reduces the scattering time. Our results shed light on the scattering processes determining the light emission efficiency in optoelectronic and photonic devices based on 1L-TMDs. [less ▲]

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See detailFrustration inducing tasks as tools for assessing adolescent emotion regulation
Battistutta, Layla UL; Steffgen, Georges UL

Scientific Conference (2018, November)

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among ... [more ▼]

Adolescents can be at risk for the development of mental health symptoms which can be exacerbated by emotion regulation problems. Hence, empirically validated tools to assess emotion regulation among adolescents in experimental settings are needed, but so far potential differences between already existing frustration inducing tasks are not well understood. The aim of the present study was thus to compare the efficacy of two non-verbal distress tolerance tasks – the Behavioural Indicator of Resiliency to Distress (BIRD, Lejuez et al.), and the Mirror Tracing Persistence Task (MPTP; Strong et al., 2003), in inducing frustration in a sample of 72 adolescents between the ages of 11 and 16. Adolescents’ subjective, physiological and behavioural emotion responses were assessed via self-report (PANAS-C; Laurent et al., 1999), heart rate monitoring and persistence on the task respectively, and associated with their self-reported emotion regulation difficulties (DERS-SF, Gullone & Taffe, 2012) as well as strategy use during the task (ERQ-state; Egloff et al., 2006). Both tasks were found to be subjectively frustrating, as evidenced by significant differences between pre- and post- reported negative affect. Beyond the similar self-reported psychological distress for both tasks, stronger negative physiological and behavioural reactions were however found for the BIRD task with higher heart rates as well as a tendency towards a shorter persistence on this task. The emotional responses were found to be correlated with adolescents reported difficulties, above all with their reported impulsiveness. Adolescents’ strategy use of reappraisal and suppression did not differ between tasks. Due to the similar self-reported negative affect after both tasks, these findings validate the use of both tasks in an adolescent population. In addition, they highlight potential differences between tasks in terms of emotion responses. These discrepancies should be taken into account in further studies due to their implications for the interpretation of findings. [less ▲]

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See detailThe Effect of Morphosyntactic Training on Multilingual Fifth-Graders' Spelling in French
Bilici, Natalia UL; Ugen, Sonja UL; Fayol, Michel UL et al

in Applied Psycholinguistics (2018), 39(6), 1319-1343

Detailed reference viewed: 9 (1 UL)
See detailRanke2.uni.lu; an online multilingual teaching platform for lessons on digital source criticism
Scagliola, Stefania UL

Learning material (2018)

Ranke.2 is a teaching platform that offers lessons on how to critically assess and work with digital historical sources

Detailed reference viewed: 10 (0 UL)
See detailOral History under scrutiny in München; a multidisciplinary workshop with interview data
Scagliola, Stefania UL; Corti, Louise

in Scagliola, Stefania (Ed.) Oral History under scrutiny in München; a multidisciplinary workshop with interview data (2018)

The challenge that we have taken up as a multidisciplinary group of scholars interested in strengthening the position of interview data in the Digital Humanities realm, is to encourage scholars to use ... [more ▼]

The challenge that we have taken up as a multidisciplinary group of scholars interested in strengthening the position of interview data in the Digital Humanities realm, is to encourage scholars to use technology to handle their interview data, and to engage with practices of fellow scholars in adjacent disciplines. Coming from distinctive disciplines such as oral history, ethnography, sociology, media studies, speech technology, computational linguistics, socio-linguistics, phonetics, human media interaction, information - and computer science, we all have a different interest in human expression, the modalities in which it is conveyed - written text, speech, gestures, sounds - and the ways in which it can be structured in order to be studied. Technology is now able to facilitate processes that used to be cumbersome, such as transcription and its alignment with audio, but it also offers ways of venturing into other disciplines or teaming up with a scholar from a different discipline to compare each others analytical approaches and results. [less ▲]

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See detailTo Google or not to Google, have a look at Ranke2!
Scagliola, Stefania UL

in Scagliola, Stefania (Ed.) To Google or not to Google, have a look at Ranke2! (2018)

Ranke 2 is a platform for digital source criticism with lessons in a variety of time effort and complexity. It is meant to lecturers and students to deal with critically questioning sources that can be ... [more ▼]

Ranke 2 is a platform for digital source criticism with lessons in a variety of time effort and complexity. It is meant to lecturers and students to deal with critically questioning sources that can be found on the web. [less ▲]

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See detailTechnology’s Storytellers reloaded A text-mining experiment in history of technology
Lucchesi, Anita UL; Fickers, Andreas UL

Scientific Conference (2018, October 12)

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See detailoral history and technology - integrating digital tools in the scholarly workflow
Scagliola, Stefania UL; Corti, louise; Calamai, silvia et al

Poster (2018, October 08)

This poster is the outcome of the multidisciplinary workshop held in Munchen in september 2018, in which a multidisciplinary group of scholars experimented with automatic transcription tools, text ... [more ▼]

This poster is the outcome of the multidisciplinary workshop held in Munchen in september 2018, in which a multidisciplinary group of scholars experimented with automatic transcription tools, text analysis, annotation and emotion recognition tools, applied to interview data [less ▲]

Detailed reference viewed: 9 (0 UL)
See detailIdentifier, contrôler, réprimer. L'impact de 14-18 sur la circulation des personnes
Scuto, Denis UL

Conference given outside the academic context (2018)

Detailed reference viewed: 13 (2 UL)
See detailAppunti di storia dell'immigrazione italiana a Lussemburgo
Scuto, Denis UL

Presentation (2018, October 05)

Detailed reference viewed: 13 (2 UL)
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See detailLes mensonges populistes
Scuto, Denis UL; Grasser, Fabien

Speeches/Talks (2018)

Detailed reference viewed: 10 (0 UL)
See detailThe ecology of the unseen
Wilmes, Paul UL

Scientific Conference (2018, October)

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See detailLe microbiote humain et son impacte sur la santé
Wilmes, Paul UL

Scientific Conference (2018, October)

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See detailUnderstanding the role of the microbiome in Parkinson’s disease
Wilmes, Paul UL

Scientific Conference (2018, October)

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See detailOpinion Statement ECJ-TF 2/2018 on the ECJ Decision of 7 September 2017 in Eqiom (Case C-6/16), concerning the Compatibility of the French Anti-Abuse Rule Regarding Outbound Dividends with the EU Parent-Subsidiary Directive (2011/96) and the Fundamental Freedoms
García Prats, Alfredo; Haslehner, Werner UL; Heydt, Volker et al

in European Taxation (2018)

This is an Opinion Statement prepared by the CFE ECJ Task Force on Eqiom (Case C-6/16), in respect of which the Sixth Chamber of the Court of Justice of the European Union (ECJ) delivered its decision on ... [more ▼]

This is an Opinion Statement prepared by the CFE ECJ Task Force on Eqiom (Case C-6/16), in respect of which the Sixth Chamber of the Court of Justice of the European Union (ECJ) delivered its decision on 7 September 2017. The CFE welcomes the Eqiom decision. In an international context where the fight against tax avoidance and aggressive tax planning is intensifying, it is important to preserve the fundamental principles of a balanced tax system: Free choice of the least taxed route, legal certainty, respect for principles concerning burden of proof, etc. In this respect, the Court appears to be the guardian of these rights. In line with its previous decisions and upholding the fundamental ideas of the Internal Market, the ECJ in Eqiom and Deister and Juhler clearly confirms that Member States may neither employ general presumptions of abuse nor define any tax planning or structuring as abusive in light of secondary EU law or the fundamental freedoms. [less ▲]

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See detailBiographies as a methodology to unveil the politicization of the Court of Justice of the EU
Fritz, Vera UL

Presentation (2018, September 21)

Detailed reference viewed: 8 (1 UL)
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See detailInfluence of head group and chain length of surfactants used for stabilising liquid crystal shells
Sharma, Anjali UL; Lagerwall, Jan UL

in Liquid Crystals (2018), 45(13-15), 2319-2328

We investigate the stability and textural development in nematic liquid crystal (LC) shells, with aqueous interior and exterior, as a function of the type and concentration of surfactant stabiliser of the ... [more ▼]

We investigate the stability and textural development in nematic liquid crystal (LC) shells, with aqueous interior and exterior, as a function of the type and concentration of surfactant stabiliser of the shell interfaces. The LC is the common thermotropic nematic 5CB and the surfactants are commercial, of cat- as well as of anionic type, with varying alkyl chain length. In addition to stabilising the shell interfaces, surfactants are generally assumed to promote radial (homeotropic) LC alignment, based on prior studies where the surfactant concentration was well above the critical micelle concentration (CMC). Here, we focus on the low-concentration range, below CMC. We find that both cat- and anionic surfactants can stabilise shells, although the higher water solubility of cationics can render stabilisation more difficult. We also conclude that surfactants do not necessarily impose homeotropic alignment; if the surfactant concentration is very low, the director may adopt planar alignment at the 5CB–water interface. Interestingly, the threshold concentration, where the surfactant takes control of alignment, is different for the shell inside and outside. Shells stabilised by solutions of surfactant with concentration near the threshold may therefore adopt a hybrid configuration, with homeotropic inside and planar outside. [less ▲]

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