منابع مشابه
Mantle plumes persevere
A recent census suggests that seamounts1 — typically extinct underwater volcanoes — are numerous. It has been estimated that about 125,000 seamounts with a height of more than one kilometre exist on our ocean floors. Most of these are postulated to form at volcanic hotspots that are the surface expressions of mantle plumes — hot material upwelling from Earth’s interior. Yet, many seamounts do n...
متن کاملWavelengths of Gyrotactic Plumes
Bioconvection occurs as the result of the collective behaviour of many microorganisms swimming in a fluid and is realized as patterns similar to those of thermal convection which occur when a layer of fluid is heated from below. We consider the phenomenon of pattern formation due to gyrotaxis, an orientation mechanism which results from the balance of gravitational and viscous torques acting on...
متن کاملCorn syrup mantle plumes.
In the dark, microscopic plastic beads in the 200-gallon tank of corn syrup glow and sparkle when light from a projector shines at them in geophysical fluid dynamicist Christopher Kincaid’s laboratory at the University of Rhode Island. Experiments with this goo could help explain whether columns of magma rising up from near the Earth’s core might explain supervolcanic activity. Scientists have ...
متن کاملCompression d'images par SVD et sur-approximation des composantes de chrominance
RÉSUMÉ. Dans cet article, nous présentons un nouveau schéma de compression d’image en couleurs qui effectue une approximation de la matrice des valeurs singulières. L’image doit être convertie dans l’espace luminance / chrominance avant d’être traitée comme dans le cas de la norme JPEG 4 : 2 : 0. Notre algorithme repose sur un sous-échantillonnage de la chrominance, puis une sur-approximation d...
متن کاملHot Spots and Mantle Plumes
Hot spots are anomalous areas of surface volcanism that cannot be directly associated with plate tectonic processes. The term hot spot is used rather loosely. It is often applied to any long-lived volcanic center that is not part of the global network of mid-ocean ridges and island arcs. The classic example is Hawaii. Anomalous regions of thick crust on ocean ridges are also considered to be ho...
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ژورنال
عنوان ژورنال: Clio
سال: 2012
ISSN: 1252-7017,1777-5299
DOI: 10.4000/clio.10491