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See detailUnequal-sphere packing model for the structural arrangement of the well-ordered adsorbate-substrate system
Tkatchenko, Alexandre UL; Batina, Nikola

in Physical Review. B: Condensed Matter and Materials Physics (2004), 70(19), 1-8

In order to understand the well-ordered adsorbate-substrate systems at atomic level, a method is developed based on the simulation of packing arrangements for layers of unequal spheres, in three ... [more ▼]

In order to understand the well-ordered adsorbate-substrate systems at atomic level, a method is developed based on the simulation of packing arrangements for layers of unequal spheres, in three-dimensional space. The model, based on geometrical principles, is developed for fee structure consisting of two hexagonal ordered layers. During simulation, adsorbate spheres were accommodated in different positions, forming a great variety of structures, in dependence of the intersphere distance of the upper layer spheres. Using the average height of the adsorbate layer on the flat substrate as a determinant parameter, several specific structures have been selected as the most probable: (√3 x √3)R30°, (√7 x √7)R19.1°, and (3 x 3). Indeed, they correspond to typical accommodations of the iodine adatoms on the Pt(111) surface, earlier found in experimental studies, which clearly supports the validity of our model. The model developed in our study could completely and satisfactorily describe the accommodation process of the iodine adlayer on the Pt(111) surface. This methodology could be of great help for interpretation of scanning tunneling microscopy images, better understanding of adlayer structures, and design of adsorbate-substrate systems with exciting properties. [less ▲]

Detailed reference viewed: 126 (8 UL)
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See detailDas Unerhörte der Erinnerung des Unerhörten. Zur ästhetischen Produktivität der Memoria in der Nach-Wende-Novellistik
Heimböckel, Dieter UL

in Gilleir, Anke; De Winde, Arne (Eds.) Literatur im Krebsgang. Totenbeschwörung und Memoria in der deutschsprachigen Gegenwartsliteratur nach 1989 (2008)

Detailed reference viewed: 53 (1 UL)
See detailUnerhörtes aus dem Niemandsland. Ralf Rothmanns Roman „Wäldernacht“
Heimböckel, Dieter UL

in Der Deutschunterricht : Beiträge zu seiner Praxis und wissenschaftlichen Grundlegung (2010), 62(2), 68-76

Detailed reference viewed: 52 (2 UL)
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See detailDas UNESCO Weltkulturerbe der Großregion SaarLorLux
Mendgen, Eva; Pauly, Michel UL; Caruso, Geoffrey UL et al

E-print/Working paper (2011)

In der Großregion gibt es heute nicht weniger als dreizehn UNESCO-Welterbestätten. Sie stehen für die reiche Geschichte und die außergewöhnliche kulturelle Vielfalt der Großregion, sie repräsentieren ... [more ▼]

In der Großregion gibt es heute nicht weniger als dreizehn UNESCO-Welterbestätten. Sie stehen für die reiche Geschichte und die außergewöhnliche kulturelle Vielfalt der Großregion, sie repräsentieren unterschiedliche Epochen und Kategorien. Bau- und Industriedenkmäler gehören ebenso dazu, wie Platz- und Altstadtensembles, Festungsanlagen und ganze Kulturlandschaften. Jede Welterbestätte bringt ihre eigene Geschichte mit sich, ihr eigenes räumliches, kulturelles, gesellschaftliches Koordinatensystem. [less ▲]

Detailed reference viewed: 29 (1 UL)
See detailUnexpected flow and relaxation behaviour of a low molecular weight glass former
Baller, Jörg UL

Presentation (2015, January 22)

Detailed reference viewed: 43 (4 UL)
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See detailUnfairness at Work: Well-Being and Quits
D'Ambrosio, Conchita UL; Clark, Andrew; Barazzetta, Marta UL

in Labour Economics (2018), 51

We here consider the effect of the level of income that individuals consider to be fair for the job they do, which we take as measure of comparison income, on both subjective well-being and objective ... [more ▼]

We here consider the effect of the level of income that individuals consider to be fair for the job they do, which we take as measure of comparison income, on both subjective well-being and objective future job quitting. In six waves of German Socio-Economic Panel data, the extent to which own labour income is perceived to be unfair is significantly negatively correlated with subjective well-being, both in terms of cognitive evaluations (life and job satisfaction) and affect (the frequency of feeling happy, sad and angry). Perceived unfairness also translates into objective labour-market behaviour, with current unfair income predicting future job quits. [less ▲]

Detailed reference viewed: 339 (29 UL)
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See detailUnfavorable Land Endowment, Cooperation, and Reversal of Fortune
Litina, Anastasia UL

E-print/Working paper (2012)

This research advances the hypothesis that reversal of fortunes in the process of economic develop- ment can be traced to the effect of natural land productivity on the desirable level of cooperation in ... [more ▼]

This research advances the hypothesis that reversal of fortunes in the process of economic develop- ment can be traced to the effect of natural land productivity on the desirable level of cooperation in the agricultural sector. In early stages of development, unfavorable land endowment enhanced the economic incentive for cooperation in the creation of agricultural infrastructure that could mitigate the adverse effect of the natural environment. Nevertheless, despite the beneficial effects of cooperation on the intensive margin of agriculture, low land productivity countries lagged behind during the agricultural stage of development. However, as cooperation, and its persistent effect on social capital, have become increasingly important in the process of industrialization, the transition from agriculture to industry among unfavorable land endowment economies was expedited, permitting those economies that lagged behind in the agricultural stage of development, to overtake the high land productivity economies in the industrial stage of development. Exploiting exogenous sources of variations in land productivity across countries the research further explores the testable predictions of the theory. It establishes that: (i) reversal of fortunes in the process of development can be traced to variation in natural land productivity across countries. Economies characterized by favorable land endowment dominated the world economy in the agricultural stage of development but were overtaken in the process of industrialization; (ii) lower level of land productivity in the past is associated with higher levels of contemporary social capital; (iii) cooperation, as reflected by agricultural infrastructure, emerged primarily in places were land was not highly productive and collective action could have diminished the adverse effects of the environment and enhance agricultural output. [less ▲]

Detailed reference viewed: 61 (7 UL)
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See detailDer ungeplante Ausbau des Luxemburgischen im Spannungsfeld von Germania und Romania
Fehlen, Fernand UL

in Quo Vadis, Romania? (2015), (45), 65-80

Detailed reference viewed: 403 (11 UL)
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See detailUngerechtigkeitssensibilität als Prädiktor soziopolitischen Erlebens und Verhaltens – Entwicklung und Validierung einer Kurzskala
Beierlein, C.; Baumert, A.; Schmitt, M. et al

Scientific Conference (2011, September)

Detailed reference viewed: 23 (0 UL)
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See detailUngleiche Schwestern? Hochbegabung und Kreativität.
Baudson, Tanja UL

Article for general public (2010)

Detailed reference viewed: 11 (0 UL)
See detailUngleicheiten in früher Kindheit. Was trägt die Kindertagesbetreuung zu deren Abbau oder Verstetigung bei?
Bollig, Sabine UL; Betz, Tanja

in Luxemburg, Caritas (Ed.) Caritas Sozialalmanach 2016- Ungleichheiten (2016)

Wie die meisten EU-Staaten, setzt auch Luxemburg mit dem quantitativen wie qualitativen Ausbau von Kindertageseinrichtungen in der frühen Kindheit auf so genannte kindzentrierte sozialinvestive ... [more ▼]

Wie die meisten EU-Staaten, setzt auch Luxemburg mit dem quantitativen wie qualitativen Ausbau von Kindertageseinrichtungen in der frühen Kindheit auf so genannte kindzentrierte sozialinvestive Politikstrategien , in deren Zuge eine flächendeckende, hochwertige und frühe Kindertagesbetreuung als besonders „effektives Mittel im Krieg gegen die Vererbung sozialer Nachteile “ angesehen wird. Den vorschulischen Kindertageseinrichtungen kommt neben ihrer arbeits- und sozialpolitischen Funktion dabei vor allem die Aufgabe zu, gleichsam präventiv-kompensatorisch dafür zu sorgen, dass alle Kinder gleich welcher Herkunft durch frühe Bildungsangebote gute Startbedingungen für ihre schulische Bildungslaufbahn erhalten. Vor dem Hintergrund der bereits für das Schulsystem dargelegten Spannung zwischen dem Abbau sozialer Ungleichheiten und deren Reproduktion durch ihre Übersetzung in Bildungsungleichheiten, drängt sich jedoch die Frage auf, ob und wenn ja wie genau Kindertageseinrichtungen in der Lage sind diese hohen Erwartungen zu erfüllen. Gelingt es Kindertageseinrichtungen bisher ungleiche soziale Bildungsbedingungen von jungen Kindern auszugleichen oder lassen sich vielmehr Prozesse einer ‚Verfrühung von Bildungsungleichheiten’ beobachten? Diese Fragen stehen im Fokus des Beitrags, der den internationalen Stand der Forschung zum Zusammenhang von sozialer Ungleichheit und Kindertagesbetreuung nachzeichnet. An ausgewählten Forschungsergebnissen werden dabei insbesondere die sich bisher abzeichnenden Mechanismen der Reproduktion sozialer Ungleichheiten in der Kindertagesbetreuung aufgezeigt, die Ansatzpunkte für eine ungleichheitssensible Qualitätsentwicklung liefern können. [less ▲]

Detailed reference viewed: 171 (8 UL)
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See detailThe unholy alliance of „genius and madness.“
Baudson, Tanja UL; Preckel, F.

Scientific Conference (2008)

Detailed reference viewed: 10 (0 UL)
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See detailUniaxial negative thermal expansion and metallophilicity in Cu3[Co(CN)6]
Sapnik, A. F.; Liu, X.; Böstrom, H. L. B. et al

in Journal of Solid State Chemistry (2018), 258

We report the synthesis and structural characterisation of the molecular framework copper(I) hexacyanocobaltate(III), Cu3[Co(CN)6], which we find to be isostructural to H3[Co(CN)6] and the colossal ... [more ▼]

We report the synthesis and structural characterisation of the molecular framework copper(I) hexacyanocobaltate(III), Cu3[Co(CN)6], which we find to be isostructural to H3[Co(CN)6] and the colossal negative thermal expansion material Ag3[Co(CN)6]. Using synchrotron X-ray powder diffraction measurements, we find strong positive and negative thermal expansion behaviour respectively perpendicular and parallel to the trigonal crystal axis: α = 25.4(5) MK a −1 and α = − 43.5(8) MK c −1. These opposing effects collectively result in a volume expansivity α = 7.4(11) MK V −1 that is remarkably small for an anisotropic molecular framework. This thermal response is discussed in the context of the behaviour of the analogous H- and Ag-containing systems. We make use of density-functional theory with many-body dispersion interactions (DFT + MBD) to demonstrate that Cu+…Cu+ metallophilic (‘cuprophilic’) interactions are significantly weaker in Cu3[Co(CN)6] than Ag+…Ag+ interactions in Ag3[Co(CN)6], but that this lowering of energy scale counterintuitively translates to a more moderate—rather than enhanced—degree of structural flexibility. The same conclusion is drawn from consideration of a simple GULP model, which we also present here. Our results demonstrate that strong interactions can actually be exploited in the design of ultra-responsive materials if those interactions are set up to act in tension. [less ▲]

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See detailUnidirectional P-body transport during the yeast cell cycle.
Garmendia-Torres, Cecilia; Skupin, Alexander UL; Michael, Sean A. et al

in PloS one (2014), 9(6), 99428

P-bodies belong to a large family of RNA granules that are associated with post-transcriptional gene regulation, conserved from yeast to mammals, and influence biological processes ranging from germ cell ... [more ▼]

P-bodies belong to a large family of RNA granules that are associated with post-transcriptional gene regulation, conserved from yeast to mammals, and influence biological processes ranging from germ cell development to neuronal plasticity. RNA granules can also transport RNAs to specific locations. Germ granules transport maternal RNAs to the embryo, and neuronal granules transport RNAs long distances to the synaptic dendrites. Here we combine microfluidic-based fluorescent microscopy of single cells and automated image analysis to follow p-body dynamics during cell division in yeast. Our results demonstrate that these highly dynamic granules undergo a unidirectional transport from the mother to the daughter cell during mitosis as well as a constrained "hovering" near the bud site half an hour before the bud is observable. Both behaviors are dependent on the Myo4p/She2p RNA transport machinery. Furthermore, single cell analysis of cell size suggests that PBs play an important role in daughter cell growth under nutrient limiting conditions. [less ▲]

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See detailUnified Description of the Optical Phonon Modes in N-Layer MoTe2
Froehlicher, Guillaume; Lorchat, Etienne; Fernique, François et al

in Nano Letters (2015), 15

N-layer transition metal dichalcogenides provide a unique platform to investigate the evolution of the physical properties between the bulk (three-dimensional) and monolayer (quasi-two-dimensional) limits ... [more ▼]

N-layer transition metal dichalcogenides provide a unique platform to investigate the evolution of the physical properties between the bulk (three-dimensional) and monolayer (quasi-two-dimensional) limits. Here, using high-resolution micro-Raman spectroscopy, we report a unified experimental description of the Γ-point optical phonons in N-layer 2H-molybdenum ditelluride (MoTe2). We observe series of N-dependent low-frequency interlayer shear and breathing modes (below 40 cm–1, denoted LSM and LBM) and well-defined Davydov splittings of the mid-frequency modes (in the range 100–200 cm–1, denoted iX and oX), which solely involve displacements of the chalcogen atoms. In contrast, the high-frequency modes (in the range 200–300 cm–1, denoted iMX and oMX), arising from displacements of both the metal and chalcogen atoms, exhibit considerably reduced splittings. The manifold of phonon modes associated with the in-plane and out-of-plane displacements are quantitatively described by a force constant model, including interactions up to the second nearest neighbor and surface effects as fitting parameters. The splittings for the iX and oX modes observed in N-layer crystals are directly correlated to the corresponding bulk Davydov splittings between the E2u/E1g and B1u/A1g modes, respectively, and provide a measurement of the frequencies of the bulk silent E2u and B1u optical phonon modes. Our analysis could readily be generalized to other layered crystals [less ▲]

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See detailUnified Design for Parallel Execution of Coupled Simulations using the Discrete Particle Method
Besseron, Xavier UL; Hoffmann, Florian UL; Michael, Mark UL et al

in Proceedings of the Third International Conference on Parallel, Distributed, Grid and Cloud Computing for Engineering (2013)

This paper presents the enhanced design of the Discrete Particle Method (DPM), a simulation tool which provides high quality and fast simulations to solve a broad range industrial processes involving ... [more ▼]

This paper presents the enhanced design of the Discrete Particle Method (DPM), a simulation tool which provides high quality and fast simulations to solve a broad range industrial processes involving granular materials. It enables to resolve mechanical and thermodynamics problems through different simulation modules (motions, chemical conversion). This new design allows to transparently couple the simulation modules in parallel execution. It relies on a unified interface and timebase of the simulation modules and a flexible decomposition in cells of the simulation space. Experimental results study the behavior of the Orthogonal Recursive Bisection (ORB) partitioning algorithm. A good scalability is achieved as the parallel execution on a distributed platform provides a 17-times speedup using 64 processes. [less ▲]

Detailed reference viewed: 181 (66 UL)