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  ARCHIVED - Vidéoconfére...  
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Débattre des aspects positifs et négatifs de rapporter des échantillons de roc et de sol de Mars.
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Debate the pros and cons of returning rock and soil samples from Mars.
  ARCHIVED - Persée - Con...  
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Persée retournait chez lui, sur le dos de Pégase, quand il aperçut Andromède. Enchaînée à un roc, la princesse était sur le point d'être dévorée par le monstre Cetus. Persée tua le monstre et sauva Andromède qu'il épousa par la suite.
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Perseus led a very exciting life. One of his first adventures was to slay the Medusa, a hideous woman with snakes for hair who could turn people into stone with one glance. Perseus cleverly used his shining shield as a mirror, so that he could attack the Medusa without looking directly at her. Perseus cut off the Medusa's head, and from her blood the winged horse Pegasus was born. Perseus was flying home on Pegasus when he saw Andromeda. The princess was chained to a rock and about to be eaten by the sea monster Cetus. Perseus killed the sea monster and rescued Andromeda, whom he later married. After many happy years together, they died and were put into the sky by the gods.
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La géologie du sol influe sur l’intensité. En général, les secousses sont plus longues et plus fortes sur un sol meuble que sur du roc ou un sol ferme.
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The underlying geology also affects intensity. People on soft soils usually experience longer and greater shaking than those on bedrock or stiff soils.
  ARCHIVÉ - Tremblements ...  
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La surface de la Terre est divisée en vastes plaques rocheuses qui se déplacent sur le matériau plus fluide qui les supporte. Deux de ces plaques se touchent près de Sumatra. La plaque australienne se déplace vers le nord, frappant celle d'Asie, et s'enfonce sous elle.
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The Earth's surface is divided into large, rocky plates, which move around on the more fluid material beneath. Near Sumatra, two of these plates are colliding. The Australia plate is moving northwards, hitting the Asia plate, and then sliding under it. The energies released in this process drive a multitude of volcanoes, including Krakatoa, which exploded in 1883, with disastrous consequences. Sometimes the plates jam, and the huge forces pushing them compress and deform the rocks, storing enormous amounts of energy. Finally something snaps, the stresses relax catastrophically and there is an earthquake. Events like this result in the sudden movement of billions of tonnes of rock. To visualize what happens then, think of a spinning ice skater.
  ARCHIVÉ - Activité scie...  
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le roc, l’argile et le sol renferment une grande quantité de silicium.
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Rocks, clay and soil include large amounts of silicon.
  ARCHIVÉ - Tremblements ...  
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Ce dernier ne pouvant varier, la vitesse du patineur augmente en compensation. Le pan de roc qui a cédé lors du séisme a changé assez la répartition des matériaux à l'intérieur de la Terre pour en modifier le moment d'inertie.
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Angular momentum is related to three things: the shape of a body, how much mass it has, and how fast it's rotating. The first two things we lump together in a quantity we call the "moment of inertia". By pulling in her arms, the skater changes her shape, and consequently reduces her moment of inertia. Since her angular momentum has to stay the same, she has to rotate faster to compensate. The movement of all that rock during the earthquake changed the distribution of material in the Earth sufficiently to alter its moment of inertia. To keep the angular momentum constant, our planet changed its rotation speed. There are other things that vary the rate at which our planet rotates, but that will need another article.
  ARCHIVÉ - Tremblements ...  
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La surface de la Terre est divisée en vastes plaques rocheuses qui se déplacent sur le matériau plus fluide qui les supporte. Deux de ces plaques se touchent près de Sumatra. La plaque australienne se déplace vers le nord, frappant celle d'Asie, et s'enfonce sous elle.
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The Earth's surface is divided into large, rocky plates, which move around on the more fluid material beneath. Near Sumatra, two of these plates are colliding. The Australia plate is moving northwards, hitting the Asia plate, and then sliding under it. The energies released in this process drive a multitude of volcanoes, including Krakatoa, which exploded in 1883, with disastrous consequences. Sometimes the plates jam, and the huge forces pushing them compress and deform the rocks, storing enormous amounts of energy. Finally something snaps, the stresses relax catastrophically and there is an earthquake. Events like this result in the sudden movement of billions of tonnes of rock. To visualize what happens then, think of a spinning ice skater.
  ARCHIVED - Le rover Mar...  
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Le rover Marsville 2008 sera capable de mouvement plutôt que d'être un « atterrisseur », comme Phoenix. On lui confiera des tâches, comme creuser des trous dans la surface de Mars et recueillir des échantillons de roc à l'aide d'un mécanisme de raclage.
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The Marsville Rover 2007 will be capable of movement rather than being a "lander" like the Phoenix. It will be given tasks including digging holes in the surface of Mars and collecting rock samples using a scoop mechanism. The Marsville Rover will have an advanced feature of being able to take pictures and sending these back to Mission Control for analysis. Advanced models will also include the capability of collecting weather samples and transmitting this data to Mission Control.
  ARCHIVÉ - La nanotechno...  
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La pâte, constituée de ciment Portland hydraté et d'eau, couvre la surface d'agrégats de granulométrie variable. L'hydratation fait durcir la pâte, dont la résistance s'accroît jusqu'à prendre celle du roc et devenirce qu'on appelle le béton.
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Concrete is a composite mixture containing a binding phase (cement paste) and aggregates. The paste, composed of hydrated Portland cement and water, coats the surface of the fine and coarse aggregates. Through a chemical reaction called hydration, the paste hardens and gains strength to form the rock-like mass known as concrete. Portland cement is manufactured by igniting (at 1300-1500°C) a mixture of raw materials, mainly composed of limestone (calcium carbonate) and other aluminium silicates such as clays and shale. The combination of energy use and carbon dioxide output makes cement production a leading contributor to green house gas production, accounting for about six per cent of the annual global total.
  ARCHIVED - Prends garde...  
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Le mystérieux matériau est apparu pour la première fois dans une carotte de roc prélevée au fond d'une mine serbe, en Europe de l'Est. Incapables de l'identifier, les chercheurs de l'exploitation se sont tournés vers les scientifiques du Conseil national de recherches du Canada (CNRC), de Ressources naturelles Canada, du Musée canadien de la nature et du Muséum d'histoire naturelle de Londres (R.-U.).
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The mysterious material first appeared in a core sample of rock drilled from a mine in Serbia, Eastern Europe. Unable to identify it, researchers from the mine called in help from scientists at Canada's National Research Council (NRC), Natural Resources Canada, the Canadian Museum of Nature, and the Natural History Museum (London, U.K.). This team worked together to analyze and categorize the unidentified mineral.
  ARCHIVED - Radon - Cons...  
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Logé dans le sol et le roc, on recourt à ce gaz pour détecter les tremblements de terre.
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Because radon is located in the soil and rocks, the gas is used as an earthquake detector.
  ARCHIVÉ - La recherche ...  
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Selon la Dre Pamela Whitfield, de l'Institut de technologie des procédés chimiques et de l'environnement du CNRC (ITPCE-CNRC), le projet passera par plusieurs étapes cruciales. Pour commencer, la Dre Whitfield et son collègue de l'Institut des sciences et des techniques environnementales de Singapour, le Dr Tim White, étudieront et préciseront les propriétés des minéraux « stables » qu'on transformera en « pierre » artificielle par un procédé de pointe pour la céramique.
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According to Dr. Pamela Whitfield of the NRC Institute for Chemical Process and Environmental Technology, the project involves several key steps. To begin, Dr. Whitfield will work with her counterpart at Singapore's Institute for Environmental Science and Engineering, Dr. Tim White, to study and characterize the properties of "stable" mineral structures which, through advanced ceramic processing, will be turned into new synthetic "rock-like" materials. The project will also entail fundamental studies of the synthesis, crystal structure and microstructure of these new rock-like materials.