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Peer Reviewed
See detailSolvent effects on crystal nucleation in colloidal suspensions
Schilling, Tanja UL

Scientific Conference (2013)

Detailed reference viewed: 55 (2 UL)
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See detailSolvent hydrodynamics speed up crystal nucleation in suspensions of hard spheres
Radu, Marc UL; Schilling, Tanja UL

in Europhysics Letters (2014), 105

We present a computer simulation study on the crystal nucleation process in suspensions of hard spheres, fully taking into account the solvent hydrodynamics. If the dynamics of crystallization in this ... [more ▼]

We present a computer simulation study on the crystal nucleation process in suspensions of hard spheres, fully taking into account the solvent hydrodynamics. If the dynamics of crystallization in this system were purely diffusive, the crystal nucleation rate would be inversely proportional to the solvent viscosity. However, we observe that the nucleation rate is enhanced at high viscosities with respect to the diffusive behaviour. This effect might explain the large discrepancy between the nuclation rates obtained by simulation and experiment that have been reported in the literature so far. [less ▲]

Detailed reference viewed: 138 (8 UL)
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See detailSolving arithmetic problems in first and second language: Does the language context matter?
Van Rinsveld, Amandine UL; Schiltz, Christine UL; Brunner, Martin et al

in Learning and instruction (2016)

Learning mathematics in a second language is a challenge for many learners. The purpose of the study was to provide new insights into the role of the language context in mathematic learning and more ... [more ▼]

Learning mathematics in a second language is a challenge for many learners. The purpose of the study was to provide new insights into the role of the language context in mathematic learning and more particularly arithmetic problem solving. We investigated this question in a GermaneFrench bilingual educational setting in Luxembourg. Participants with increasing bilingual proficiency levels were invited to solve additions in both their first and second instruction languages: German and French. Arithmetic problems were presented in two different conditions: preceded by a semantic judgment or without additional language context. In the French session we observed that additions were systematically performed faster in the condition with an additional language context. In contrast no effect of the context was observed in the German session. In conclusion, providing a language context enhanced arithmetic performances in bilinguals' second instruction language. This finding entails implications for designing optimal mathematic learning environments in multilingual educational settings. [less ▲]

Detailed reference viewed: 320 (29 UL)
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See detailSolving Chisini's functional equation
Marichal, Jean-Luc UL

in Aequationes Mathematicae (2010), 79(3), 237-260

We investigate the n-variable real functions G that are solutions of the Chisini functional equation F(x) = F(G(x),...,G(x)), where F is a given function of n real variables. We provide necessary and ... [more ▼]

We investigate the n-variable real functions G that are solutions of the Chisini functional equation F(x) = F(G(x),...,G(x)), where F is a given function of n real variables. We provide necessary and sufficient conditions on F for the existence and uniqueness of solutions. When F is nondecreasing in each variable, we show in a constructive way that if a solution exists then a nondecreasing and idempotent solution always exists. We also provide necessary and sufficient conditions on F for the existence of continuous solutions and we show how to construct such a solution. We finally discuss a few applications of these results. [less ▲]

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See detailSolving Chisini's functional equation
Marichal, Jean-Luc UL

Scientific Conference (2010, June)

Detailed reference viewed: 97 (8 UL)
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See detailSolving equations with negatives or crossing the formalizing gap
Vlassis, Joëlle UL

in Vlassis, Joëlle (Ed.) Proceedings of the 25th International conference for the Psychology of M athematics Education (PME 25) (2001)

Detailed reference viewed: 182 (5 UL)
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See detailSolving extremely ill-posed structures
Beex, Lars UL; Duflot, Marc; Adam, Laurent

Scientific Conference (2016, April)

Detailed reference viewed: 85 (4 UL)
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See detailSolving the FIXML2Code-case Study with HenshinTGG
Hermann, Frank UL; Nachtigall, Nico UL; Braatz, Benjamin UL et al

in Rose, Louis M.; Krause, Christian; Horn, Tassilo (Eds.) Proceedings of the 7th Transformation Tool Contest - part of the Software Technologies: Applications and Foundations (STAF 2014) federation of conferences (2014)

Triple graph grammars (TGGs) provide a formal framework for bidirectional model transformations. As in practice, TGGs are primarily used in pure model-to-model transformation scenarios, tools for text-to ... [more ▼]

Triple graph grammars (TGGs) provide a formal framework for bidirectional model transformations. As in practice, TGGs are primarily used in pure model-to-model transformation scenarios, tools for text-to-model and model-to-text transformations make them also applicable in text-to-text transformation contexts. This paper presents a solution for the text-to-text transformation case study of the Transformation Tool Contest 2014 on translating FIXML (an XML notation for financial transactions) to source code written in Java, C# or C++. The solution uses the HenshinTGG tool for specifying and executing model-to-model transformations based on the formal concept of TGGs as well as the Xtext tool for parsing XML content to yield its abstract syntax tree (text-to-model transformation) and serialising abstract syntax trees to source code (model-to-text transformation). The approach is evaluated concerning a given set of criteria. [less ▲]

Detailed reference viewed: 165 (16 UL)
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See detailSolving the stochastic Burgers equation with a sensitivity derivative-driven Monte Carlo method
Hauseux, Paul UL; Hale, Jack UL; Bordas, Stéphane UL

Software (n.d.)

Please see the links below for complete information.

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See detailSolving the three dimensional quadratic assignment problem on a computational grid
Mezmaz, Mohand; Mehdi, Malika UL; Bouvry, Pascal UL et al

in Cluster Computing (2014), 17(2), 205-217

The exact resolution of large instances of combinatorial optimization problems, such as three dimensional quadratic assignment problem (Q3AP), is a real challenge for grid computing. Indeed, it is ... [more ▼]

The exact resolution of large instances of combinatorial optimization problems, such as three dimensional quadratic assignment problem (Q3AP), is a real challenge for grid computing. Indeed, it is necessary to reconsider the resolution algorithms and take into account the characteristics of such environments, especially large scale and dynamic availability of resources, and their multi-domain administration. In this paper, we revisit the design and implementation of the branch and bound algorithm for solving large combinatorial optimization problems such as Q3AP on the computational grids. Such gridification is based on new ways to effi- ciently deal with some crucial issues, mainly dynamic adaptive load balancing and fault tolerance. Our new approach allowed the exact resolution on a nation-wide grid of a dif- ficult Q3AP instance. To solve this instance, an average of 1,123 computing cores were used for less than 12 days with a peak of around 3,427 computing cores. [less ▲]

Detailed reference viewed: 116 (1 UL)
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See detailSolving very large instances of the scheduling of independent tasks problem on the GPU
Pinel, Frédéric UL; Dorronsoro, Bernabé UL; Bouvry, Pascal UL

in Journal of Parallel and Distributed Computing (2013), 73(1), 101-110

Detailed reference viewed: 152 (6 UL)
See detail„Solvitur ambulando“. Pilgerräume bei Werner Herzog: Vom Gehen im Eis und Wolfgang Büscher: Berlin – Moskau
Amann, Wilhelm UL

in Börnchen, Stefan; Mein, Georg (Eds.) Weltliche Wallfahrten. Auf der Spur des Realen. (2010)

Detailed reference viewed: 219 (4 UL)
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See detailSomatoforme Symptome: Zusammenhänge mit Low-Frequency-Herzratenvariabilität und Selbstberichte zu chronischem psychosozialen Stress, aber nicht mit HPA-Achsen-Aktivität
Hansen, G.; Larra, M. F.; Vögele, Claus UL et al

in Kirschbaum, C. (Ed.) 45. Jahrestagung Psychologie und Gehirn - Abstractband (2019)

Nach dem Perception-Filter-Modell der somatoformen Störungen (Rief & Barsky, 2005) könnte verstärkte Signalübermittlung von Körperorganen zur Symptomentstehung beitragen. Dabei wurden insbesondere das ... [more ▼]

Nach dem Perception-Filter-Modell der somatoformen Störungen (Rief & Barsky, 2005) könnte verstärkte Signalübermittlung von Körperorganen zur Symptomentstehung beitragen. Dabei wurden insbesondere das sympathische Nervensystem und die HPA-Achse als primäre physiologische Stressachsen diskutiert. Aufgrund hoher Heterogenität somatoformer Störungen ist die Befundlage zu beiden Achsen jedoch gemischt, was dafürspricht, größere Populationen ohne Multi-Komorbidität zu untersuchen. Bei einer studentischen Stichprobe (N=217; 113 w; Alter: 18-33 [M=23.0; SD=2.9] Jahre; BMI=22.2 [SD=2.8]) wurden selbstberichteter chronischer Stress (Trierer Inventar für Chronischen Stress/TICS) und somatoforme Symptome (Screening für Somatoforme Störungen/SOMS-2) erhoben. Alle Probanden lieferten Cortisol- Aufwachreaktionen (Erwachen, +15,+30,+45,+60 Min.) an zwei aufeinanderfolgenden Tagen, sowie ein Cortisol-Tagesprofil. Zusätzlich wurde im Labor in einer 10-minütigen Ruhemessung EKG zur Bestimmung der Ruhe-Herzratenvariabilität (RMSSD, pNN50, SDNN; Low- und High-Frequency) als Indikatoren des zentralen sympathischen und parasympathischen Tonus erfasst. Diejenigen TICS-Skalen, die psychosozialen Stress reflektieren, sowie „Chronische Besorgnis“ waren zwischen r=.16 und .26 mit somatoformen Symptomen korreliert. Die Skala „Chronische Besorgnis“ korrelierte außerdem positiv mit dem Tagescortisolspiegel (r=.19), sowie negativ mit SDNN (r=-.20), RMSSD (r=-.17), pNN50 (r=-.17), LF-Power (r=-.19) und HF-Power (r=-.16; alle ps < .05). Somatoforme Symptome korrelierten hingegen nicht mit Indikatoren der physiologischen Stressachsen. In einem Regressionsmodell mit Somatisierungsindex als Kriterium zeigte sich nur für die TICS-Skalen „Mangel an sozialer Anerkennung“ (b=.19) und „Chronische Besorgnis“ (b=.25), sowie LF-HRV (b=.20) signifikante Vorhersagekraft. Die Annahmen des Perception-Filter-Modells konnten nur hinsichtlich des sympathischen Nervensystems bestätigt werden, was daher als Frühindikator für somatoforme Störungen betrachtet werden könnte. Dennoch sind selbstberichteter chronischer Stress, vor allem „Besorgnis“, bei gesunden Probanden die stärksten Prädiktoren für somatoforme Symptome. [less ▲]

Detailed reference viewed: 67 (4 UL)
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See detailSomatostatin-like immunoreactivity in primary afferents of the medial articular nerve and colocalization with substance P in the cat
Hanesch, Ulrike UL; Heppelmann, Bernd; Schmidt, Robert

in Journal of Comparative Neurology (1995), 354

Detailed reference viewed: 75 (1 UL)
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See detailSome aspects of the local theory of generalized Dhombres functional equations in the complex domain
Tomaschek, Jörg UL

in ESAIM: Proceedings and Surveys (2012), 36

We study the generalized Dhombres functional equation f(zf(z)) = ϕ(f(z)) in the complex domain. The function ϕ is given and we are looking for solutions f with f(0) = w0 and w0 is a primitive root of ... [more ▼]

We study the generalized Dhombres functional equation f(zf(z)) = ϕ(f(z)) in the complex domain. The function ϕ is given and we are looking for solutions f with f(0) = w0 and w0 is a primitive root of unity of order l ≥ 2. All formal solutions for this case are described in this work, for the situation where ϕ can be transformed into a function which is linearizable and local analytic in a neighbourhood of zero we also show that we obtain local analytic solutions. We also discuss an example where it is possible to use other methods than we use in the general case. [less ▲]

Detailed reference viewed: 84 (0 UL)
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See detailSome basic reflections on voice-controlled natural language human-Siri talk: Hey Siri, you are challenging the interface between the oral and the written.
Arend, Béatrice UL; Fixmer, Pierre UL

in Proceedings 10th International Conference on Education and New Learning Technologies (2018, July)

Detailed reference viewed: 105 (2 UL)
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See detailSome children are more different than others. Language practices in Luxembourgian Nurseries
Neumann, Sascha UL

in Qualitative Research Journal (2012), 12(2), 183-192

Purpose – The purpose of the paper is to explore how professional educators in early childhood education cope with diverse linguistic environments in their daily work. The article addresses this issue by ... [more ▼]

Purpose – The purpose of the paper is to explore how professional educators in early childhood education cope with diverse linguistic environments in their daily work. The article addresses this issue by focusing on practices of language use in Luxembourgian nurseries. Design/methodology/approach – The paper is reflecting on empirical data of an ethnographic research project currently conducted in six different day care facilities for children from three months to four years old. The study uses participant observation and videography as data collection strategies. Data analysis was based on field notes and protocols, video recordings, photographs, documents, and artifacts. Findings – On the basis of the ethnographic observations, two different practical regimes of “doing linguistic diversity” are discriminated: an area of “practicing super-diversity” and an area of “practicing difference”. In the context of the second regime it becomes visible that the use of Luxemburgish as lingua franca for the communication between educators and children produces unequal distributed opportunities for foreign children when participating linguistically in the everyday life of daycare facilities. Originality/value – The paper raises serious questions about the language policies in the Luxembourgian daycare sector as well as in respect to the supposed inclusion effects of early childhood education and care, effects that both politicians and professionals emphasize regularly. This especially concerns the conceptualization of “the child” which is in use while professionals treat children as foreign language speakers. [less ▲]

Detailed reference viewed: 100 (6 UL)
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See detailSome conclusions from the measurements of temperatures and their gradients on eigenfrequencies of bridges
Mahowald, Jean UL; Maas, Stefan UL; Nguyen, Viet Ha UL et al

Scientific Conference (2014, June 30)

The ambient air temperature and solar radiation are affecting the soil and asphalts’ stiffness and hence the eigenfrequencies of a bridge. Very often eigenfrequencies are automatically determined by ... [more ▼]

The ambient air temperature and solar radiation are affecting the soil and asphalts’ stiffness and hence the eigenfrequencies of a bridge. Very often eigenfrequencies are automatically determined by special algorithms from structural response data generated by ambient excitation and measured by permanently installed sensors that is sometimes called “output only analysis” or “operating modal analysis”. Additionally the ambient air temperature is registered and finally the eigenfrequencies are analyzed versus the air temperature. The graph is normally a scatter diagram and each point is one measurement. In general the eigenfrequencies decrease with increasing temperature, whereas often linear regression is used to determine the line of best fit. But the slope of this straight line and the width of the scatter around the regression line differ from bridge to bridge. Especially this scatter field around the mean value at a determined temperature complicates the detection of damage, which is also often based on eigenfrequencies’ reduction. Hence the difficulty among others consists in separating damage from environmental effects. [less ▲]

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See detailSome critical reflections on the special issue: Collaboration in the 21st century: The theory, assessment, and teaching of collaborative problem solving
Stadler, Matthias; Shubeck, Keith T.; Greiff, Samuel UL et al

in Computers in Human Behavior (2020)

Detailed reference viewed: 99 (1 UL)
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See detailSome Identification Issues in Nonparametric Linear Models with Endogenous Regressors.
Severini, Thomas A.; Tripathi, Gautam UL

in Econometric Theory (2006), 22

Detailed reference viewed: 101 (0 UL)