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Institution

Université catholique de Louvain

EducationLouvain-la-Neuve, Belgium
About: Université catholique de Louvain is a education organization based out in Louvain-la-Neuve, Belgium. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 25319 authors who have published 57360 publications receiving 2172080 citations. The organization is also known as: University of Louvain & UCLouvain.


Papers
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Journal ArticleDOI
TL;DR: The large-distance asymptotic behavior of the exact exchange-cor correlation potential to O(1/r4) is found to agree with theoretical predictions, and the short range behaviour of the exchangecorrelation potential is very close to quadratic.
Abstract: Starting from exceedingly accurate many-body wavefunctions, we have constructed essentially exact densities, exchange-correlation potentials and components of the total energy for helium and twoelectron ions. These density functional results are compared to the corresponding quantities obtained from a variety of commonly used approximate density functionals, namely the local density approximation and various generalized gradient approximations in order to test the accuracy of the approximate functionals. Although the generalized gradient approximations yield improved energies compared to the local density approximation, the exchange and correlation potentials (especially the latter) obtained from the generalized gradient approximations are in poor agreement with the corresponding exact potentials. The large-distance asymptotic behavior of the exact exchange-correlation potential to O(1/r4) is found to agree with theoretical predictions. The short range behaviour of the exchangecorrelation potential is very close to quadratic. The prospects for the improved generalized gradient approximations are discussed. Keywords: density functional theory, exchange-correlation potential, generalized gradient approximation

317 citations

Journal ArticleDOI
TL;DR: In this article, the authors improved Standard Big Bang Nucleosynthesis (SBBN) calculations taking into account new nuclear physics analyses (Descouvemont et al. 2003) using a Monte-Carlo technique, calculating the abundances of light nuclei versus the baryon to photon ratio.
Abstract: We improve Standard Big Bang Nucleosynthesis (SBBN) calculations taking into account new nuclear physics analyses (Descouvemont et al. 2003). Using a Monte-Carlo technique, we calculate the abundances of light nuclei versus the baryon to photon ratio.The results concerning omegab are compared to relevant astrophysical and cosmological observations. Consistency between WMAP, SBBN results and D/H data strengthens the deduced baryon density and has interesting consequences on cosmic chemical evolution. A significant discrepancy between the calculated Li-7 deduced from WMAP and the Spite plateau is clearly revealed. To explain this discrepancy three possibilities are invoked : uncertainties on the Li abundance, surface alteration of Li in the course of stellar evolution or poor knowledge of the reaction rates related to Be-7 destruction. In particular, the possible role of the up to now neglected Be-7(d,p)2He-4 and Be-7(d,alpha)Li5 reactions is considered. The impressive advances in CMB observations provide a strong motivation for more efforts in experimental nuclear physics and high quality spectroscopy to keep BBN in pace. Comment: accepted in ApJ, 22 pages, 5 figures

317 citations

Journal ArticleDOI
TL;DR: This review describes the elaboration of antibacterial coatings based on natural bactericidal substances produced by living organisms such as antimicrobial peptides, bacteriolytic enzymes and essential oils and reports on very recent strategies directly inspired from marine animal life and based on surface microstructuring.

317 citations

Journal ArticleDOI
TL;DR: In this article, the magnetic properties of arrays of submicronic (35 nm-500 nm) Ni and Co wires fabricated by electrodeposition into the cylindrical pores of track-etched polymer membranes are reported.
Abstract: We report on the magnetic properties of arrays of submicronic (35 nm-500 nm) Ni and Co wires fabricated by electrodeposition into the cylindrical pores of track-etched polymer membranes. This work reveals intrinsic differences between the magnetization reversal mechanisms taking place in these two systems. For Ni, the crystal anisotropy is small compared to the shape anisotropy and the magnetization lies along the wire axis. In contrast, the strong crystal anisotropy of Co and the orientation of the crystal easy axis (nearly perpendicular to the wire axis), allows for the appearance of a multidomain magnetization configuration, each domain being oriented partially along the normal to the wire axis. Experimental evidence for the existence of this multidomain configuration has been obtained from resistivity and magnetization measurements. Large scale micromagnetic calculations for Co and Ni wires with high aspect ratios corroborate the strong influence of the crystal anisotropy on the overall properties of Co wires and provide an accurate microscopic description of the nucleation fields and the magnetization reversal mechanism for Ni wires.

316 citations

Journal ArticleDOI
TL;DR: The objective of the manuscript is to give a comprehensive description of a new set of guidelines for CTV delineation in the node-positive neck and the post-operative neck, with a complementary atlas of the new anatomical structures to be included.

316 citations


Authors

Showing all 25540 results

NameH-indexPapersCitations
Robert Langer2812324326306
Pulickel M. Ajayan1761223136241
Klaus Müllen1642125140748
Giacomo Bruno1581687124368
Willem M. de Vos14867088146
David Goldstein1411301101955
Krzysztof Piotrzkowski141126999607
Andrea Giammanco135136298093
Christophe Delaere135132096742
Vincent Lemaitre134131099190
Michael Tytgat134144994133
Jian Li133286387131
Jost B. Jonas1321158166510
George Stephans132133786865
Peter Hall132164085019
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023147
2022424
20212,952
20202,969
20192,752
20182,676