Search results for "FINE"
showing 10 items of 1800 documents
Les formes résilientes de la convivialité en confinement
2021
International audience; En première analyse, il convient de saisir la mise en tension de la convivialité en confinement, à la fois sous l’angle dramaturgique de pratiques bouleversées au quotidien par le Covid-19 et dans le cadre heuristique de la tensivité qui restitue la dynamique du champ entre les formes de la convivialité, de la table à la convivialité sociale. Une fois posé ce cadre, l’isotopie alimentaire sera retenue comme forme paradigmatique, notamment à travers deux registres figuratifs, la convivialité intra-familiale reconfigurée pendant le confinement et, autre forme résiliente, la convivialité en ligne, avec les apéros virtuels et les liens solidaires connectés, formes de rec…
Protein/Hydration Water Dynamics in Hard Confinement: Dielectric Relaxations and Picoseconds Hydrogen Fluctuations
2011
In this review we report on some experimental studies on the dynamics of Myoglobin in a confined geometry, obtained by encapsulation in a porous silica matrix, at low hydration levels. After formation through the solgel method, the samples were left aging/drying in order to reach a condition where only one or two water layers surround the proteins. In order to put in evidence the specific effect of confinement in the silica host, we compared this system with another one (i.e. hydrated powder) where proteins are confined by other proteins. Using elastic neutron scattering we investigate the temperature dependence of the mean square displacements of non-exchangeable hydrogen atoms of sol-gel …
Exciton and multiexciton optical properties of single InAs/GaAs site-controlled quantum dots
2013
We have studied the optical properties of InAs site-controlled quantum dots (SCQDs) grown on pre-patterned GaAs substrates. Since InAs nucleates preferentially on the lithography motifs, the location of the resulting QDs is determined by the pattern, which is fabricated by local oxidation nanolithography. Optical characterization has been performed on such SCQDs to study the fundamental and excited states. At the ground state different exciton complex transitions of about 500 μeV linewidth have been identified and the fine structure splitting of the neutral exciton has been determined (≈65 μeV). The observed electronic structure covers the demands of future quantum information technologies.…
El lujo cambiante. El vestido y la difusión de las modas en la Corona de Aragón (siglos XIII-XV)
2015
La apariencia física de las persona era ya en la Baja Edad Media el primer indicativo de su condición social, pero en un período mucho más urbanizado e interconectado que los anteriores, el refinamiento de la indumentaria se convirtió en un hecho con unas connotaciones económicas, políticas y culturales de gran calado. El mismo incremento de la movilidad social llevó además a que no bastara con invertir grandes sumas en la propia imagen, sino que fuera necesario estar atento a los cambios de eso que llamamos “moda”, cuyos orígenes se suelen situar en estos momentos en los que las clases dominantes tradicionales buscaban nuevos elementos de diferenciación frente a los advenedizos. Todo ello …
Destin du covid-19
2020
International audience; La lutte moderne contre les épidémies privilégie le dépistage rapide, le diagnostic, les soins et la quarantaine des malades plutôt que le confinement général de la population. Comparée aux pics de mortalité du passé récent, celle due au covid-19 ne paraît pas anormale mais elle s'est localisée dans quelques régions et grandes agglomérations. Deux cas emblématiques sont évoqués : le paquebot de croisière Diamond Princess et le porte-avions Charles de Gaulle. Le pronostic vital ne semble engagé que pour des sujets dont le système immunitaire est affaibli (comme le grand âge). En revanche, la population en bonne santé ne paraît pas en danger d'autant plus qu'un traitem…
Orientation of the electric field gradient and ellipticity of the magnetic cycloid in multiferroic BiFeO3
2016
This work was supported by Uniwersytet Pedagogiczny.
Periodismo de datos iberoamericano: desarrollo, contestación y cambio social. Presentación
2018
espanolA medida que el foco de la investigacion del periodismo de datos se desplaza hacia el Sur Global, Iberoamerica es una region que permanece relativamente poco explorada. Sin embargo, no solo ha sido un espacio pionero en las practicas de periodismo de datos sino que posee un enorme potencial de cambio social y desarrollo a traves de datos abiertos. De hecho, Iberoamerica ha destacado en muchas areas relacionadas con este campo. El periodico argentino La Nacion tiene hasta la fecha una de las unidades de periodismo de datos mas innovadoras en el ambito internacional. Ademas, La Nacion, junto con el periodico espanol El Pais, The Guardian, The New York Times y Spiegel, fue una de las pr…
Ecology, environmental requirements and conservation of corticioid fungi occupying small diameter dead wood
2016
The increasing human impact upon the biosphere of earth is causing profound changes across all spatial scales. The ability to cope with human-induced disturbance varies among organisms; specialist species are more negatively affected than generalist species. Forests are among the most heavily affected ecosystems; especially the dead wood associated organisms are in peril. The earlier research has strongly focused on large diameter dead wood and associated species. The aim of this thesis was to investigate small diameter dead wood and collect systematic information about species richness and abundance as well as habitat and substrate preferences of associated corticioid fungi. Fungal data wa…
THE PHYSICAL ORIGIN OF PROTEIN DYNAMICAL TRANSITION: A LIQUID-LIQUID TRANSITION IN HYDRATION WATER?
2015
In this thesis I study, by means of neutron scattering, calorimetry, and dielectric spectroscopy, the physical origin of protein dynamical transition (PDT) which is usually observed at ~230 K in protein hydrated powders and is deemed necessary for protein function. Measurements reported in this thesis have been performed on hydrated powders of Myoglobin. The combined use of different experimental techniques gives a coherent description of the PDT and reveals a connection with a liquid-liquid crossover occurring in the protein hydration water at about the same temperature. In order to deepen our understanding of this connection and to obtain a direct experimental evidence of the existence of…
Enhancing the luminescence efficiency of silicon-nanocrystals by interaction with H+ions
2018
The emission of silicon nanocrystals (Si-NCs), synthesized by pulsed laser ablation in water, was investigated on varying the pH of the solution. These samples emit μs decaying orange photoluminescence (PL) associated with radiative recombination of quantum-confined excitons. Time-resolved spectra reveal that both the PL intensity and the lifetime increase by a factor of ∼20 when the pH decreases from 10 to 1 thus indicating that the emission quantum efficiency increases by inhibiting nonradiative decay rates. Infrared (IR) absorption and electron paramagnetic resonance (EPR) experiments allow addressing the origin of defects on which the excitons nonradiatively recombine. The linear correl…