Dynamics of the swollen lamellar phase

in European Physical Journal E. Soft Matter (2001), 4(1), 103-114

We investigate the dynamical behavior of lamellar phases in ternary amphiphilic systems of water, oil and amphiphile. The interaction between the amphiphilic monolayers is described by the steric ... [more ▼]

We investigate the dynamical behavior of lamellar phases in ternary amphiphilic systems of water, oil and amphiphile. The interaction between the amphiphilic monolayers is described by the steric interaction due to thermal fluctuations for uncharged, and by electrostatic interactions for charged systems. The dynamics of the system is determined by the hydrodynamics of the fluid layers. The basic parameters of our model are the viscosities of the two solvents, the average thicknesses of the oil and water layers, and the bending rigidity. The model allows to consider different monolayer interactions across the oil and water layers. Relaxation rates are calculated for arbitrary wave vectors parallel and perpendicular to the average monolayer plane. We find that there is a quite complex crossover behavior from a q2 law for small parallel wave vectors to a q3 law for large q . We discuss the relevance of our result for the interpretation of dynamic light-scattering and neutron-spin-echo experiments for these systems. [less ▲]

Dynamics of viscoelastic colloidal suspensions

Doctoral thesis (2016)

The influence of different types of nanoparticles on the dynamics of glass forming matrices has been studied by small oscillatory shear rheology. Experimental measurements reveal that besides the glass ... [more ▼]

The influence of different types of nanoparticles on the dynamics of glass forming matrices has been studied by small oscillatory shear rheology. Experimental measurements reveal that besides the glass transition process of the matrix an additional relaxation process occurs in presence of nanoparticles. The latter is identified as the macroscopic signature of the microscopic temporal fluctuations of the intrinsic stress and is called Brownian relaxation. Besides the fact that Brownian relaxation has so far not been observed in colloidal suspensions with a matrix exhibiting viscoelastic behaviour in the frequency range of the experimental probe, the study reveals another important feature to be highlighted: the evolution of the Brownian relaxation times depends non-monotonously on the filler concentration. This finding challenges the use of the classical Peclet-time as a characteristic timescale for Brownian relaxation. Literature defines the Peclet-time as the specific time needed by a particle to cover –via self-diffusion- a distance comparable to its own size. As a main result it will be shown that after replacing the particle size which is relevant for the Peclet time by the mean interparticle distance depending on the filler content the non-monotonic evolution of the relaxation times can be fully described. Moreover, the introduction of the new characteristic length scale allows to include data from literature into the phenomenological description. [less ▲]

Dynamics underlying interictal to ictal transition in temporal lobe epilepsy: insights from a neural mass model

in European Journal of Neuroscience (2017)

Dynamik von Variantenrepertoires in Luxemburg und Gibraltar. Phonetisch-phonologische Fokussierungsprozesse

in Mattheier, Klaus J. (Ed.) Norm und Variation (1997)

La dynamique de la complexité en matière de relations extérieures des Etats membres de l'Union européenne

Doctoral thesis (2013)

In its capacity of a member of the European Union, the State agrees to submit to a set of rules framing its autonomy in the field of external relations. While this set of rules can be assessed in terms of ... [more ▼]

In its capacity of a member of the European Union, the State agrees to submit to a set of rules framing its autonomy in the field of external relations. While this set of rules can be assessed in terms of categories of legal effects acting unilaterally upon the EU Member State, the present study attempts to go further by examining what we believe to be a dynamic chain of complexity, composed of actions, reactions, and retroactions of the actors involved. During our research, we indeed found that the manner in which the Union affects the EU Member States’ external relations is far from being a one-way process, but rather constitutes permanent and circular dynamics of interaction between what we shall call an integrated Member State and the Union, between the Union and what we shall call a global Member State, and between the respective Member State’s global and integrated faces. The integrated Member State may step aside to let the Union act in its stead, or act in conjunction with the Union, but ʽtaking the back seatʼ in this manner does not engage its global face, its alter ego, which will return to take center stage (if it did not simply stay there to begin with) to complete (or to compete with) the actions of the Union, or even to solicit the Unionʼs support with respect to the relations it established vis-à-vis third parties. As we proceed, we find that the Member State, who initially appeared to be a mere passive object of our research, is in fact an active agent, contributing, whether through retroaction or through the competing exercise of its sovereign competencies, to the face of the Unionʼs external relations. Accordingly, no research into the external relations of the EU can be complete without taking into account the impact of EU law on the integrated Member States, and the impact felt in turn by the EU as the result of the Member Statesʼ global actions. In the same way, such research should consider the impact of international law on the global Member States and the impact felt in turn by international law as a result of the actions of the integrated face of these same Member States [less ▲]

La dynamique de la stratification sociale

in Castel, Robert; Chauvel, Louis (Eds.) Les mutations de la société française : les grandes questions économiques et sociales (2013)

Dynamiques de (dés)appartenance au cours de la vie : le cas des Portugais de "seconde génération" au Grand-Duché de Luxembourg

Doctoral thesis (2019)

Cette étude s’intéresse aux sentiments de (dés)appartenances et à leur (re)construction au cours de la vie des Portugais de « seconde génération » au Luxembourg. Sur le plan théorique, notre recherche se ... [more ▼]

Cette étude s’intéresse aux sentiments de (dés)appartenances et à leur (re)construction au cours de la vie des Portugais de « seconde génération » au Luxembourg. Sur le plan théorique, notre recherche se fonde essentiellement sur trois approches : le transnationalisme, la théorie des dynamiques relationnelles et la théorie du parcours de vie. Les enfants d’é(im)migrés, a-t-on suggéré, sont élevés dans un champ social transnational qui implique des contacts transfrontaliers et des visites (au sens réel et/ou symbolique) dans le pays d’origine. Ainsi, dans un premier temps, nous commençons par investiguer de manière compréhensive leurs pratiques (trans)nationales (notamment leur variation en portée, intensité et fréquence au cours du parcours de vie) ; puis, dans un deuxième temps, nous demandons : comment les Portugais de « seconde génération » au Luxembourg (re)construisent-ils, négocient-ils et accomplissent-ils leurs (dés)appartenances au cours du parcours de vie et quelle est le rôle joué par le pays d’origine ?. Pour répondre à ce questionnement, nous avons adopté comme méthodologie principale l’entretien compréhensif. Les données empiriques pour cette étude qualitative proviennent de 25 entretiens compréhensifs (incluant la réalisation d’une Carte de (dés)appartenance) réalisés auprès de membres de la « seconde génération » issue de l’é(im)migration portugaise au Luxembourg. Les participants avaient entre 19 et 55 ans au moment de l’entretien. Le corpus a fait l’objet d’une analyse par théorisation ancrée. En plus de montrer le poids de la « donne résidentielle » et de la « donne technologique », qui a fortement infléchi/ et infléchit encore les parcours des enfants d’é(im)migrés Portugais au Luxembourg (en fonction de la cohorte), nous mettons en exergue les deux sources de tensions majeures quant à leurs sentiments de (dés)appartenance et mettons en avant l’agentivité de nos participants qui, à partir de deux stratégies de (dés)appartenance (déportugalisation et/ou luxembourgisation), mobilisent les clés de résolution de ces mêmes tensions. Nous soulignons également le rôle qu’y jouent les sentiments de fierté et de reconnaissance (liés de près à la question de la mobilité sociale). Nous concluons par, l’intégration de notre modèle de (re)construction des (dés)appartenance dans un processus plus large que nous nommons processus de (re)configuration identitaire. [less ▲]

Dynamiques de la mise en liste. Une approche sémio-linguistique

in Milcent-Lawson, S.; et alii (Eds.) Liste et effet de liste en littérature (2013)

Dynamiques socio-historiques de la professionnalisation de l’intervention sociale au Luxembourg

in Foudrignier, Marc; Molina, Yvette; Tschopp, Françoise (Eds.) Dynamiques du travail social en pays francophones (2014)

Dynamische Kinetik der anaeroben Fermentation von fettigen Küchenabfällen mittels verschiedener Abfallvorbehandlungen für die Biogasproduktion

in Chemie Ingenieur Technik (2014, August 28), 86(9), 1390