923 research outputs found
Le satellite Météosat et l'océanographie : étude des températures de la mer au voisinage des côtes de Mauritanie et du Sénégal
Poissons démersaux du plateau continental sénégambien : application de l'analyse en composantes principales à l'étude d'une série de chalutages
Poissons demersaux du plateau continental sénégambien : application de l'analyse en composantes principales à l'étude d'une série de chalutages
Première estimation de la biomasse et de la production potentielle en poissons démersaux du plateau continental sénégalo-mauritanien entre le cap Timiris et le cap Roxo
Evaluation du niveau optimum d'exploitation de deux stocks de Penaeus duorarum du plateau continental sénégambien
Structure and Thermodynamical Properties of Zirconium hydrides from first-principle
Zirconium alloys are used as nuclear fuel cladding material due to their
mechanical and corrosion resistant properties together with their favorable
cross-section for neutron scattering. At running conditions, however, there
will be an increase of hydrogen in the vicinity of the cladding surface at the
water side of the fuel. The hydrogen will diffuse into the cladding material
and at certain conditions, such as lower temperatures and external load,
hydrides will precipitate out in the material and cause well known
embrittlement, blistering and other unwanted effects. Using phase-field methods
it is now possible to model precipitation build-up in metals, for example as a
function of hydrogen concentration, temperature and external load, but the
technique relies on input of parameters, such as the formation energy of the
hydrides and matrix. To that end, we have computed, using the density
functional theory (DFT) code GPAW, the latent heat of fusion as well as solved
the crystal structure for three zirconium hydride polymorphs: \delta-ZrH1.6,
\gamma-ZrH, and \epsilon-ZrH2.Comment: 9 pages, 9 figures, 15th Int. Conf. Environmental Degradation of
Materials in Nuclear Power Systems-water reactors Uses graficx, subfigure,
threeparttable (2012
Making Rules and Unmaking Choice: Federal Conscience Clauses, the Provider Conscience Regulation, and the War on Reproductive Freedom
Migrations des poissons démersaux le long des côtes ouest-africaines de 10 à 24° de latitude nord
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