Search results for "FOS"
showing 10 items of 15075 documents
Decomposition Process of Carboxylate MOF HKUST-1 Unveiled at the Atomic Scale Level
2016
HKUST-1 is a metal-organic framework (MOF) which plays a significant role both in applicative and basic fields of research, thanks to its outstanding properties of adsorption and catalysis but also because it is a reference material for the study of many general properties of MOFs. Its metallic group comprises a pair of Cu2+ ions chelated by four carboxylate bridges, forming a structure known as paddle-wheel unit, which is the heart of the material. However, previous studies have well established that the paddle-wheel is incline to hydrolysis. In fact, the prolonged exposure of the material to moisture promotes the hydrolysis of Cu-O bonds in the paddle-wheels, so breaking the crystalline n…
La tensione metamorfica della scrittura
2018
Da quando portava calzoni da maschio, nascondeva i capelli biondi e faceva acrobazie sugli scogli, si era trasformata nella voce nei gesti, e la metamorfosi era stata repentina, inarrestabile come un febbrone da tonsillite o il fiore del mandorlo quando pazziava già alla fine di gennaio tra il niurume dei carrubi. Spicca al cuore di questo passo tratto dalle pagine di uno dei romanzi più intensi di Silvana Grasso, L’incantesimo della buffa, edito da Marsilio nel 2011, il lessema “metamorfosi”in cui si racchiude il senso e il pedale di una poetica innervata dalla coesistenza dei contrasti, che eleva l’ossimoro ad insegna di una realtà di cui la parola somatizza le asperità, gli eccessi in un…
On one-dimensionality of metric measure spaces
2019
In this paper, we prove that a metric measure space which has at least one open set isometric to an interval, and for which the (possibly non-unique) optimal transport map exists from any absolutely continuous measure to an arbitrary measure, is a one-dimensional manifold (possibly with boundary). As an immediate corollary we obtain that if a metric measure space is a very strict $CD(K,N)$ -space or an essentially non-branching $MCP(K,N)$-space with some open set isometric to an interval, then it is a one-dimensional manifold. We also obtain the same conclusion for a metric measure space which has a point in which the Gromov-Hausdorff tangent is unique and isometric to the real line, and fo…
Differential of metric valued Sobolev maps
2020
We introduce a notion of differential of a Sobolev map between metric spaces. The differential is given in the framework of tangent and cotangent modules of metric measure spaces, developed by the first author. We prove that our notion is consistent with Kirchheim's metric differential when the source is a Euclidean space, and with the abstract differential provided by the first author when the target is $\mathbb{R}$.
Uniformization of two-dimensional metric surfaces
2014
We establish uniformization results for metric spaces that are homeomorphic to the Euclidean plane or sphere and have locally finite Hausdorff 2-measure. Applying the geometric definition of quasiconformality, we give a necessary and sufficient condition for such spaces to be QC equivalent to the Euclidean plane, disk, or sphere. Moreover, we show that if such a QC parametrization exists, then the dilatation can be bounded by 2. As an application, we show that the Euclidean upper bound for measures of balls is a sufficient condition for the existence of a 2-QC parametrization. This result gives a new approach to the Bonk-Kleiner theorem on parametrizations of Ahlfors 2-regular spheres by qu…
Potentiel bioarchéologique de l’analyse des micro‐fossiles non‐polliniques : résultats préliminaires issus de deux opérations d’archéologie préventive
2019
International audience; Les micro‐fossiles non polliniques (MNP) constituent un vaste groupe de bioindicateurs (propagules ou forme de résistance, entre autres) issus de différents organismes (champignons, algues, plancton, bactérie, animaux, végétaux etc.). Si leur analyse est désormais fréquente dans les études palynologiques menées dans les milieux naturels (lacs ou zones humides), les MNP sont encore peu exploités en contexte archéologique. Leur potentiel bioarchéologique reste à évaluer mais l’enjeu est grand tant les informations qu’ils peuvent apporter sont nombreuses aussi bien sur le plan paléoenvironnemental que paléoécologique, géoarchéologique ou taphonomique. L’éventail de site…
Gestion des ressources naturelles dans le Pays de Tulle : impacts paysagers et histoire du châtaignier (Castanea sativa Mill.) de l'Antiquité à la Re…
2013
Este artículo presenta los resultados paleoambientales de los primeros análisis palinolójicos y sedimentológicos llevados a cabo en el area de Tulle (Mars, Gimel-les-Cascades, Corrèze, Francia). Se basan en la comparación de distintos indicadores bióticos (polen, microfósiles no polínicos) y sedimentarios y en la realización de 9 dataciones radiocarbónicas. Esta investigación establece datos inéditos sobre las dinámicas paisajísticas desde la Antigüedad y sus factores de control tanto climáticos como antrópicos. También analiza de que manera estos cambios paisajísticos pueden significar el desarrollo de sistemas de uso diversificados de los recursos vegetales como el cultivo del castaño (Ca…
Microwave response of bulk MgB2 samples of different granularity
2006
The microwave response of three high-density bulk MgB2 samples has been investigated in the linear and nonlinear regimes. The three samples, characterized by different mean size of grains, have been obtained by reactive infiltration of liquid Mg in powdered B preforms. The linear response has been studied by measuring the microwave surface impedance; the nonlinear response by detecting the power radiated by the sample at the second-harmonic frequency of the driving field. Our results suggest that bulk MgB2 prepared by the liquid Mg infiltration technique is particularly promising for manufacturing resonant cavities operating at microwave frequencies.
Analytical models for the pulse shape of a superconductor-ferromagnet tunnel junction thermoelectric microcalorimeter
2022
AbstractThe superconductor-ferromagnet thermoelectric detector (SFTED) is a novel ultrasensitive radiation detector based on the giant thermoelectric effect in superconductor-ferromagnet tunnel junctions. We demonstrate analytical models and solutions in the time domain for a SFTED operated as a microcalorimeter (pulse excitation), in the linear small-signal limit. Based on these solutions, the signal current and temperature pulse response were studied for two different electrical circuit models, providing design conditions for stable and non-oscillatory response.Kindly check and confirm whether the corresponding author is correctly identified.The corresponding author is correct.
Improved measurement of $^8$B solar neutrinos with $1.5 kt·y$ of Borexino exposure
2017
We report on an improved measurement of the $^8$B solar neutrino interaction rate with the Borexino experiment at the Laboratori Nazionali del Gran Sasso. Neutrinos are detected via their elastic scattering on electrons in a large volume of liquid scintillator. The measured rate of scattered electrons above 3 MeV of energy is $0.223\substack{+0.015 \\ -0.016}\,(stat)\,\substack{+0.006 \\ -0.006}\,(syst)$ cpd/100 t, which corresponds to an observed solar neutrino flux assuming no neutrino flavor conversion of $\Phi\substack{\rm ES \\ ^8\rm B}=2.57\substack{+0.17 \\ -0.18}(stat)\substack{+0.07\\ -0.07}(syst)\times$10$^6$ cm$^{-2}\,$s$^{-1}$. This measurement exploits the active volume of the …