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Monte Carlo Simulations of Surfaces and Interfaces in Materials
1996
Many applications of materials are controlled by their surface and interface properties. In particular, metallic alloys (but also mixed dielectric materials and amorphous polymer blends) are not homogeneously mixed on a microscopic length scale, although they are macroscopically homogeneous. Depending on the preparation of the sample, there exists a heterophase microstructure, with typical domain sizes, e.g. in the 1 to 102 µm range, separated by interfaces between them. The physical properties of such intrinsic interfaces (grain boundaries between small crystallites, antiphase domain boundaries in ordered alloys, Bloch walls in magnetic materials, etc.) are not only an important controllin…
Effects of finite thickness on interfacial widths in confined thin films of coexisting phases
1999
The capillary broadening of a 2-phase interface is investigated both experimentally and theoretically. When a binary mixture in a thin film with thickness D segregates into two coexisting phases the interface between the two phases may form parallel to the substrate due to preferential surface attraction of one of the components. We show that the interfacial profile (of intrinsic width w0) is broadened due to capillary waves, which lead to fluctuations, of correlation length of the local interface positions in the directions parallel to the confining walls. We postulate that acts as an upper cutoff for the spectrum of capillary waves on the interface, so that the effective mean square inter…
Computer simulation studies of finite-size broadening of solid–liquid interfaces: from hard spheres to nickel
2009
Using Molecular Dynamics (MD) and Monte Carlo (MC) simulations interfacial properties of crystal-fluid interfaces are investigated for the hard sphere system and the one-component metallic system Ni (the latter modeled by a potential of the embedded atom type). Different local order parameters are considered to obtain order parameter profiles for systems where the crystal phase is in coexistence with the fluid phase, separated by interfaces with (100) orientation of the crystal. From these profiles, the mean-squared interfacial width w^2 is extracted as a function of system size. We rationalize the prediction of capillary wave theory that w^2 diverges logarithmically with the lateral size o…
PHASE EQUILIBRIA IN THIN POLYMER FILMS
2001
Within self-consistent field theory and Monte Carlo simulations the phase behavior of a symmetrical binary AB polymer blend confined into a thin film is studied. The film surfaces interact with the monomers via short ranged potentials. One surface attracts the A component and the corresponding semi-infinite system exhibits a first order wetting transition. The surface interaction of the opposite surface is varied as to study the crossover from capillary condensation for symmetric surface fields to interface localization/delocalization transition for antisymmetric surface fields. In the former case the phase diagram has a single critical point close to the bulk critical point. In the latter…
Observation of topological gravity-capillary waves in a water wave crystal
2019
The discovery of topological phases of matter, initially driven by theoretical advances in quantum condensed matter physics, has been recently extended to classical wave systems, reaching out to a wealth of novel potential applications in signal manipulation and energy concentration. Despite the fact that many realistic wave media (metals at optical frequencies, polymers at ultrasonic frequencies) are inherently dispersive, topological wave transport in photonic and phononic crystals has so far been limited to ideal situations and proof-of-concept experiments involving dispersionless media. Here, we report the first experimental demonstration of topological edge states in a classical water …
Un palacio para un héroe: la representación del Sagrado Palacio Imperial de Constantinopla en el "Tirant lo Blanc"
2014
Joannot Martorell recovers the Gran Palacio Imperial de Constantinople in the Greek chapter of Tirant lo Blanch, in order to provide a symbolic space to the heroic projection of his main character. Tirant achieves in the fiction an impossible dream even in reality. Uses the capital of Bosphorus as a symbol for a real New Rome and rescues an enclosure that in the Christian sphere becomes the heir of the ancient Empire. In this article we will analyze with detail the resources employed by Martorell to recreate the palace environment and value the contribution of the literary text as a source for History of Art.
On Science Museums, Science Capital, and the Public Understanding of Mathematical Modelling
2020
Students’ opportunities to learn informally (e.g. by watching documentaries, visiting museums) explain socio-economic inequities in school performances. To explore informal learning about mathematical modelling, I studied two science museums, as these are environments typically visited by middle-class families. I framed the study by using the notions science capital and the public understanding of mathematical modelling (PUMM) and explored how these are mediated in science museums. The research method entailed observations of displays, artefacts, and visitors. One science museum completely detached mathematics from its use value, whereas the other offered histories of how people used mathem…
Education, capital humain et dynamique économique : analyse à partir du secteur industriel sénégalais
2005
The objective of this work is to analyze the relations between education, human capital and the industrial performances in Senegal. The approached questions are different and varied, and more particularly, they relate to the investment of industrial concerns in the human resources (levels of qualification of the workforce, training policies), at the various levels of efficiency (internal and external) of the educational system, in the adequacy training / employment, etc. The impact of the human capital investment of the firms on their own performances is finally studied.
Evolucion del rendimiento del capital humano en Espana desde 1981 a 1991
1995
International audience
Eiropas investīciju fondu sniegums
2016
Bakalaura darba temats ir " Eiropas investīciju fondu sniegums". Darba izpēta uzņēmumus finansēšanas problēmas ES ietvaros, pēc 2008.g. finanšu krīzes sekām. Tika radīta jauna stratēģija ES līmenī, ar mērķi pāriet uz kapitāla tirgus balstītam finansējumam, nodrošinajot alternatīvu bankām ka vienīgam finansējuma avotam priekš uzņēmumiem. Lai novērtēt ES CMU iniciatīvas perspektīvu, šīs darbs izpēta kopfondu efektivitātes rādītājus, un potenciālu efektivitātes rādītāju starpību, starp fondiem kas ir saistīti ar bankām un neatkarīgiem fondiem, lielākajos akciju tirgos Eirozonā. Darbs sastāv no tris daļām: 1. Pirmā daļa pēta ES banku sistēmas attīstību, to grūtības nodrošinot atbilstošu finansē…