Search results for "confine"
showing 10 items of 285 documents
Research on happiness and affect during Covid-19 confinement [Dataset]
2020
Two databases: Research on happiness and affect during Covid-19 confinement
Comment la dégradation de la vie étudiante a-t-elle affecté les manières d’étudier durant la pandémie ?
2021
International audience; Souvent considérée comme privilégiée par rapport aux autres jeunes, la population étudiante apparaît de plus en plus hétérogène en termes de ressources comme de conditions de vie. Les premières enquêtes sur les conséquences de la pandémie ont pointé cette dégradation des conditions de vie et d’études pour une partie de la population étudiante. Cette proposition de communication se base sur l’exploitation d’une enquête sur la vie étudiante durant le premier confinement. Elle s’interroge notamment sur les effets de la dégradation des conditions de vie des étudiants sur leurs manières d’étudier. Le questionnaire a été construit et diffusé en avril 2020. 3 396 personnes …
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 …
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…
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…
Effective charge from lattice QCD
2020
Using lattice configurations for quantum chromodynamics (QCD) generated with three domain-wall fermions at a physical pion mass, we obtain a parameter-free prediction of QCD's renormalisation-group-invariant process-independent effective charge, $\hat\alpha(k^2)$. Owing to the dynamical breaking of scale invariance, evident in the emergence of a gluon mass-scale, this coupling saturates at infrared momenta: $\hat\alpha(0)/\pi=0.97(4)$. Amongst other things: $\hat\alpha(k^2)$ is almost identical to the process-dependent (PD) effective charge defined via the Bjorken sum rule; and also that PD charge which, employed in the one-loop evolution equations, delivers agreement between pion parton di…
Ius migrandi e controllo delle frontiere
2015
Ius migrandi e confini statali. Migrazioni e diritto: quali regole? Il rapporto fra Stato e straniero: la soluzione della frammentazione degli status. Gli effetti del modello stato-centrico e della frammentazione degli status. Strategie per un'effettiva tutela dei diritti nel modello stato-centrico: l'accoglienza dei non cittadini.
Localization and interactions of melatonin in dry cholesterol/lecithin mixed reversed micelles used as cell membrane models
2005
The state of melatonin confined in dry cholesterol/lecithin mixed reversed micelles dispersed in CCl4 was investigated using 1H-NMR and FT-IR spectroscopies as a function of the melatonin to lecithin molar ratio (R(MLT)) and of the cholesterol to lecithin molar ratio (R(CHL)). An analysis of experimental results leads to the hypothesis that, independent of R(MLT) and as a consequence of anisotropic melatonin/lecithin, melatonin/cholesterol and cholesterol/lecithin interactions, melatonin is totally solubilized in reversed micelles. Melatonin is mainly located in and oriented in the nanodomain constituted by the hydrophilic groups of cholesterol and lecithin. A competition of melatonin and c…