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See detailEnhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities
Lopez-Ortega, Alberto; Zapata-Herrera, Mario; Maccaferri, Nicolò UL et al

in Light: Science and Applications (2020), 9

Enhancing magneto-optical effects is crucial for size reduction of key photonic devices based on non-reciprocal propagation of light and to enable active nanophotonics. Here, we disclose a so far ... [more ▼]

Enhancing magneto-optical effects is crucial for size reduction of key photonic devices based on non-reciprocal propagation of light and to enable active nanophotonics. Here, we disclose a so far unexplored approach that exploits hybridization with multipolar dark modes in specially designed magnetoplasmonic nanocavities to achieve a large enhancement of the magneto-optically induced modulation of light polarization. The broken geometrical symmetry of the design enables coupling with free-space light and hybridization of multipolar dark modes of a plasmonic ring nanoresonator with the dipolar localized plasmon resonance of the ferromagnetic disk placed inside the ring. Such hybridization results in a low-radiant multipolar Fano resonance that drives a strongly enhanced magneto-optically induced localized plasmon. The large amplification of the magneto-optical response of the nanocavity is the result of the large magneto-optically induced change of light polarization produced by the strongly enhanced radiant magneto-optical dipole, which is achieved avoiding the simultaneous enhancement of re-emitted light with the incident polarization by the driving multipolar Fano resonance. The partial compensation of the magneto-optically induced polarization change caused by the large re-emission of light with the original polarization is a critical limitation of magnetoplasmonic designs explored so far. [less ▲]

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See detailBio-assisted tailored synthesis of plasmonic silver nanorings and site-selective deposition on graphene arrays
Giovannini, Giorgia; Ardini, Matteo; Maccaferri, Nicolò UL et al

in Advanced Optical Materials (2020), 8(4), 1901583

The spontaneous interaction between noble metals and biological scaffolds enables simple and cost‐effective synthesis of nanomaterials with unique features. Here, plasmonic silver nanorings are ... [more ▼]

The spontaneous interaction between noble metals and biological scaffolds enables simple and cost‐effective synthesis of nanomaterials with unique features. Here, plasmonic silver nanorings are synthesized on a ring‐like protein, i.e., a peroxiredoxin (PRX), and used to assemble large arrays of functional nanostructures. The PRX drives the seeding growth of metal silver under wet reducing conditions, yielding nanorings with outer and inner diameters down to 28 and 3 nm, respectively. The obtained hybrid nanostructures are selectively deposited onto a solid‐state 2D membrane made of graphene in order to prepare plasmonic nanopores. In particular, the interaction between the graphene and the PRX allows for the simple preparation of ordered arrays of plasmonic nanorings on a 2D‐material membrane. This fabrication process can be finalized by drilling a nanometer scale pore in the middle of the ring. Fluorescence spectroscopic measurements in combination with numerical simulations demonstrate the plasmonic effects induced in the metallic nanoring cavity. The prepared nanopores represent one of the first examples of hybrid plasmonic nanopore structures integrated on a 2D‐material membrane. The diameter of the nanopore and the atomically thick substrate make this proof‐of‐concept approach particularly interesting for nanopore‐based technologies and applications such as next‐generation sequencing and single‐molecule detection. [less ▲]

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See detailNanoscale magnetophotonics
Maccaferri, Nicolò UL; Zubritskaya, Irina; Razdolski, Ilya et al

in Journal of Applied Physics (2020), 127(8), 080903

This Perspective surveys the state-of-the-art and future prospects of science and technology employing nanoconfined light (nanophotonics and nanoplasmonics) in combination with magnetism. We denote this ... [more ▼]

This Perspective surveys the state-of-the-art and future prospects of science and technology employing nanoconfined light (nanophotonics and nanoplasmonics) in combination with magnetism. We denote this field broadly as nanoscale magnetophotonics. We include a general introduction to the field and describe the emerging magneto-optical effects in magnetoplasmonic and magnetophotonic nanostructures supporting localized and propagating plasmons. Special attention is given to magnetoplasmonic crystals with transverse magnetization and the associated nanophotonic non-reciprocal effects and to magneto-optical effects in periodic arrays of nanostructures. We also give an overview of the applications of these systems in biological and chemical sensing, as well as in light polarization and phase control. We further review the area of nonlinear magnetophotonics, the semiconductor spin-plasmonics, and the general principles and applications of opto-magnetism and nano-optical ultrafast control of magnetism and spintronics. [less ▲]

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See detailLa question du roman terraqué aujourd’hui
Roelens, Nathalie UL

in Carnets: Revue Electronique d'Etudes Françaises de l'APEF (2020)

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See detailThe (Criminal) Liability of Legal Persons and Heads of Business: Strenghts and Weaknesses of the European Union's Approach
Ligeti, Katalin UL; Giuffrida, Fabio UL

in Revue Pénale Luxembourgeoise (2020), (5), 2-22

This article aims to analyse the current EU legal framework on the (criminal) liability of legal persons and heads of business, and discuss its strengths and weaknesses. The first section provides some ... [more ▼]

This article aims to analyse the current EU legal framework on the (criminal) liability of legal persons and heads of business, and discuss its strengths and weaknesses. The first section provides some introductory remarks on a recent cross-cutting trend in EU law, which affects both corporate and individual liability, namely the increasing blurring of boundaries between administrative and criminal law in the enforcement of financial and economic policy. The analysis then shifts to the EU rules on corporate (criminal) liability, before briefly discussing whether, in EU legislation, the attribution of liability to legal persons is accompanied by recognition of their procedural rights. Finally, this contribution examines the criminal liability of heads of business, by focusing on the field of the protection of the Union’s financial interests, which represents a useful case study to discuss the current EU approach. [less ▲]

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See detailLes deux faces du travail sur plateformes numériques : crowdwork et work on-demand
Ratti, Luca UL

in Revue Pratique de Droit Social (2020)

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See detailLändliche Räume Europas
Nienaber, Birte UL

in Gebhardt, Hans; Glaser, Rüdiger; Radtke, Ulrich (Eds.) et al Geographie - Physische Geographie und Humangeographie (2020)

The chapter of a university textbook explains the diversity of European rural areas and their development.

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See detailFight, Flight, – Or Grab a Bite! Trait Emotional and Restrained Eating Style Predicts Food Cue Responding Under Negative Emotions
Schnepper, Rebekka; Georgii, Claudio; Elchin, Katharina et al

in Frontiers in Behavioral Neuroscience (2020), 14

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See detailTowards a cross-cultural assessment of binge-watching: Psychometric evaluation of the “watching TV series motives” and “binge-watching engagement and symptoms” questionnaires across nine languages
Flayelle, Maèva; Castro-Calvo, Jesús; Vögele, Claus UL et al

in Computers in Human Behavior (2020), 111

In view of the growing interest regarding binge-watching (i.e., watching multiple episodes of television (TV) series in a single sitting) research, two measures were developed and validated to assess ... [more ▼]

In view of the growing interest regarding binge-watching (i.e., watching multiple episodes of television (TV) series in a single sitting) research, two measures were developed and validated to assess binge-watching involvement (“Binge-Watching Engagement and Symptoms Questionnaire”, BWESQ) and related motivations (“Watching TV Series Motives Questionnaire”, WTSMQ). To promote international and cross-cultural binge-watching research, the present article reports on the validation of these questionnaires in nine languages (English, French, Spanish, Italian, German, Hungarian, Persian, Arabic, Chinese). Both questionnaires were disseminated, together with additional self-report measures of happiness, psychopathological symptoms, impulsivity and problematic internet use among TV series viewers from a college/university student population (N = 12,616) in 17 countries. Confirmatory factor, measurement invariance and correlational analyses were conducted to establish structural and construct validity. The two questionnaires had good psychometric properties and fit in each language. Equivalence across languages and gender was supported, while construct validity was evidenced by similar patterns of associations with complementary measures of happiness, psychopathological symptoms, impulsivity and problematic internet use. The results support the psychometric validity and utility of the WTSMQ and BWESQ for conducting cross-cultural research on binge-watching. [less ▲]

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See detailArchitektur auf gemeinsamem Boden : Positionen und Modelle zur Bodenfrage
Hertweck, Florian UL

Book published by Lars Müller Publishers (2020)

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See detailFlows on the PSL(V)-Hitchin component
Sun, Zhe UL; Wienhard, Anna; Zhang, Tengren

in Geometric and Functional Analysis (2020), 30

In this article we define new flows on the Hitchin components for PSL(n,R). Special examples of these flows are associated to simple closed curves on the surface and give generalized twist flows. Other ... [more ▼]

In this article we define new flows on the Hitchin components for PSL(n,R). Special examples of these flows are associated to simple closed curves on the surface and give generalized twist flows. Other examples, so called eruption flows, are associated to pair of pants in S and capture new phenomena which are not present in the case when n = 2. We determine a global coordinate system on the Hitchin component. Using the computation of the Goldman symplectic form on the Hitchin component, that is developed by two of the authors in a companion paper to this article (Sun and Zhang in The Goldman symplectic form on the PGL(V)-Hitchin component, 2017. arXiv:1709.03589), this gives a global Darboux coordinate system on the Hitchin component. [less ▲]

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See detailA Spatially explicit ABM of Central Place Foraging Theory and its explanatory power for hunter-gatherers settlement patterns formation processes
Sikk, Kaarel UL; Caruso, Geoffrey UL

in Adaptive Behavior (2020)

The behavioural ecological approach to anthropology states that the density and distribution of resources determine optimal patterns of resource use and also sets its constraints to grouping, mobility and ... [more ▼]

The behavioural ecological approach to anthropology states that the density and distribution of resources determine optimal patterns of resource use and also sets its constraints to grouping, mobility and settlement choice. Central Place Foraging (CPF) models have been used for analysing foraging behaviours of hunter-gatherers and to draw a causal link from the volume of available resources in the environment to the mobility decisions of hunter-gatherers. In this study we propose a spatially explicit agent-based CPF mode. We explore its potential for explaining formation of settlement patterns and test its robustness to the configuration of space. Building on a model assuming homogeneous energy distributions we had to add several new parameters and an adaptation mechanism for foragers to predict the length of their stay, together with a heterogeneous environment configuration. The validation of the model shows that the spatially explicit CPF is generally robust to spatial configuration of energy resources. The total volume of energy has a significant effect on constraining sedentism as predicted by aspatial model and thus can be used on different environmental conditions. Still the spatial autocorrelation of resource distribution has a linear effect on optimal mobility decisions and needs to be considered in predictive models. The effect on settlement choice is not substantial and is more determined by other characteristics of settlement location. This limits the CPF models in analysing settlement pattern formation processes. [less ▲]

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See detailAnisometric mesoscale nuclear and magnetic texture in sintered Nd-Fe-B magnets
Titov, Ivan UL; Honecker, Dirk UL; Mettus, Denis et al

in Physical Review Materials (2020), 4

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See detailExperimental observation of third-order effect in magnetic small-angle neutron scattering
Metlov, Konstantin L.; Suzuki, Kiyonori; Honecker, Dirk UL et al

in Physical Review. B, Condensed Matter and Materials Physics (2020), 101

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See detailDefect-induced Dzyaloshinskii–Moriya interaction in a nanocrystalline two-phase alloy
Quan, Yifan; Kohlbrecher, Joachim; Hautle, Patrick et al

in Journal of Physics: Condensed Matter (2020), 32

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See detailExplicit Kummer theory for the rational numbers
Perucca, Antonella UL; Sgobba, Pietro UL; Tronto, Sebastiano UL

in International Journal of Number Theory (2020)

Let G be a finitely generated multiplicative subgroup of Q* having rank r. The ratio between n^r and the Kummer degree [Q(\zeta_m,\sqrt[n]{G}) : Q(\zeta_m)], where n divides m, is bounded independently of ... [more ▼]

Let G be a finitely generated multiplicative subgroup of Q* having rank r. The ratio between n^r and the Kummer degree [Q(\zeta_m,\sqrt[n]{G}) : Q(\zeta_m)], where n divides m, is bounded independently of n and m. We prove that there exist integers m_0, n_0 such that the above ratio depends only on G, \gcd(m,m_0), and \gcd(n,n_0). Our results are very explicit and they yield an algorithm that provides formulas for all the above Kummer degrees (the formulas involve a finite case distinction). [less ▲]

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See detailStudents’ trajectories through higher education: a review of quantitative research
Haas, Christina UL; Hadjar, Andreas UL

in Higher Education (2020), 1099-1118(79), 6

With the increasing availability of high-quality longitudinal data on students in higher education, scholars’ interest in how students proceed through higher education has risen. So far, the research ... [more ▼]

With the increasing availability of high-quality longitudinal data on students in higher education, scholars’ interest in how students proceed through higher education has risen. So far, the research field is diverse in theoretical perspectives and methodological approaches. Thus, based on 27 studies published in (higher) education research journals during the past two decades, this literature review provides an overview of the theoretical concepts, methodologies and main empirical findings in the study of students’ trajectories in higher education. The results depict a US dominated research field. Most theoretical frameworks are based on student’s decision-making. Across different country contexts and research designs—ranging from descriptions of student trajectories to studies predicting who engages in which types of trajectories to sequential trajectory reconstruction—we found that historically disadvantaged groups in higher education such as students from low social origin follow less linear and less smooth higher education trajectories. However, while the field of comparative education is growing steadily and may significantly contribute to explaining the link between the realization of students’ opportunities and the way how higher education is designed and implemented both on the national and local level, there were no cross-country comparison studies on higher education trajectories. [less ▲]

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See detailTo hire or not to hire: the ambivalent impact of social rehire clauses on the Transfer of Undertakings Directive
Ratti, Luca UL

in European Labour Law Journal (2020), 11(2), 225-244

Most EU countries are experiencing an increased use of Collective Labour Agreement clauses – Social Rehire Clauses – that oblige incoming service providers, while taking over a service, to employ all or ... [more ▼]

Most EU countries are experiencing an increased use of Collective Labour Agreement clauses – Social Rehire Clauses – that oblige incoming service providers, while taking over a service, to employ all or part of outgoing providers’ personnel or at least give these workers priority future hiring. In the established case law of the Court of Justice, rehiring personnel is considered a crucial element, which may trigger the application of Council Directive 2001/23 on transfers of undertakings. This article defends the need to keep Social Rehire Clauses outside the material scope of the Directive, in order to respect social partners’ collective autonomy and prevent opportunistic behaviours, while promoting a fair competition between employers. Constitutionally justified under Article 3(3) TEU, and Articles 9, 147 and 151(1) TFEU, the protection of employment pursued by Social Rehire Clauses should be interpreted as legitimate limitation to the economic freedoms enshrined in the Treaties and the Charter of Fundamental Rights. [less ▲]

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See detailMethods for mitigating disruptions in complex supply chain structures: a systematic literature review
Bier, Tobias; Lange, Anne UL; Glock, Christoph

in International Journal of Production Research (2020), 58(6), 1835-1856

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See detailIntergenerationale Familienbeziehungen im Übergang und Ambivalenzerfahrungen zwischen jungen Erwachsenen und ihren Eltern
Albert, Isabelle UL

in angewandte Forschung: Magazin für Psychogerontologie und Entwicklung über die Lebensspanne (2020), 6(Frühjahr),

Der Auszug der erwachsenen Kinder aus dem Elternhaus stellt für Eltern und junge Erwachsene gleichermaßen eine Transition in der Lebensspanne dar, die eine Regulation der familiären Beziehungen ... [more ▼]

Der Auszug der erwachsenen Kinder aus dem Elternhaus stellt für Eltern und junge Erwachsene gleichermaßen eine Transition in der Lebensspanne dar, die eine Regulation der familiären Beziehungen erforderlich macht und somit eine wichtige Familienentwicklungsaufgabe darstellt. Eltern sehen sich mit einer „empty nest“-Situation konfrontiert und mitunter kann sich das Loslassen für die Eltern als schwierig erweisen (Perrig-Chiello, 2014). Gerade im Jugend- und jungen Erwachsenenalter wird jedoch eine Anpassung der Beziehungen hin zu mehr Autonomie erforderlich, wohingegen Kontrolle und Einmischen seitens der Eltern zunehmend negativ erlebt wird. Insbesondere können sich hier unterschiedliche Zielsetzungen in den Beziehungen zwischen den Eltern und ihren erwachsenen Kindern ergeben, die mit dem Begriff des „intergenerational stake“ von Bengtson und Kollegen eingehend beschrieben wurden – junge Erwachsene streben einerseits nach Autonomie und Selbständigkeit, deren Eltern andererseits nach Kontinuität in den Beziehungen. Gleichzeitig bleiben Eltern für junge Erwachsene eine wichtige Quelle der Unterstützung und eine stabile Eltern-Kind-Beziehung bildet die Grundlage für eine gelungene Individuation (Buhl, 2003). Die Aushandlung der beiden fundamentalen Bedürfnisse nach Autonomie und Verbundenheit kennzeichnet Eltern-Kind-Beziehungen also ein Leben lang (Albert & Barros, 2017; Trommsdorff, 2006; Rothbaum & Trommsdorff, 2007). Was bedeuten diese widerstreitenden Tendenzen nun für die Qualität der Eltern-Kind-Beziehungen und insbesondere für das Erleben von Ambivalenz? Wie verändern sich die Eltern-Kind-Beziehungen mit dem Auszug aus dem Elternhaus? Diesen Fragen ist eine Studie an der Universität Luxemburg nachgegangen. Die Studie beschäftigte sich unter anderem mit den Ambivalenzerfahrungen junger Erwachsener und der Rolle des Auszugs aus dem Elternhaus. Befragt wurden junge Erwachsene im Alter zwischen 17 und 30 Jahren. [less ▲]

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