Search results for "evolution [Galaxies]"
showing 4 items of 84 documents
Nonlinear evolution equations for turbulent superfluids
2010
In this paper a system of evolution equations for turbulent superfluid helium is written in the nonlinear regime, choosing as fundamental fields the density, the velocity, the heat flux, the non-equilibrium temperature and the average vortex line density per unit volume. Approximate equations are written, where second order terms in the non-equilibrium quantities are retained.
Hölder regularity for the gradient of the inhomogeneous parabolic normalized p-Laplacian
2018
In this paper, we study an evolution equation involving the normalized [Formula: see text]-Laplacian and a bounded continuous source term. The normalized [Formula: see text]-Laplacian is in non-divergence form and arises for example from stochastic tug-of-war games with noise. We prove local [Formula: see text] regularity for the spatial gradient of the viscosity solutions. The proof is based on an improvement of flatness and proceeds by iteration.
Développement et caractérisation d’électrodes pour l’électrolyse alcaline de l’eau
2020
Splitting water into hydrogen and oxygen by electrolysis using electricity from intermittent ocean current, wind, or solar energies is one of the easiest and cleanest routes for high-purity hydrogen production and an effective way to store the excess electrical power without leaving any carbon footprints. The key dilemma for efficient large-scale production of hydrogen by splitting of water via the hydrogen and oxygen evolution reactions is the high overpotential required, especially for the oxygen evolution reaction. Hence, engineering highly active and stable earth-abundant oxygen evolution electrocatalysts with three-dimensional hierarchical porous architecture via facile, effective and …
La libertad incorporada como clave para la neuroeducación moral
2019
La libertad es uno de los principales atributos con los que tradicionalmente se ha caracterizado al ser humano. El objetivo de este artículo es analizar si a la luz de las investigaciones y los experimentos neurocientíficos es posible seguir caracterizando al ser humano como un ser con libertad. Para ello se alude al conocido experimento de Benjamin Libet y las conclusiones reduccionistas que influyentes autores como Patricia S. Churchland o Michael Gazzaniga extraen para la filosofía práctica. Desde una metodología hermenéutica, se denuncia el reduccionismo neurocientífico que pretende negar la libertad basándose en evidencias empíricas. Frente a dicho reduccionismo se propone un enfoque h…