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| + | "They've got more style than any group we've ever had."Many came into the competition looking good. But that doesn't mean they can escape getting pointers from the show's stylists some more than others.Nadia Turner, Jackson says, is this season's strongest example of a style maven who needs little help. | ||
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| + | Models under stress,christian louboutin shoes<br><br>Metallic glasses: Models under stress<br><br>Molecular simulations show that stress can induce atomic flow and mechanical failure in glassy alloys without the help of external heating,chaussure tn pas cher.<br><br>Metallic glasses, alloys with a disordered or atomic structure,Louboutin pas cher, are new materials with a range of potential engineering applications due to their high strength and spring. However, as they are prone to brittle fracture,longchamp sac, their development for practical use has remained limited. Researchers from Tohoku University in Japan1 have now uncovered an important theoretical relationship between stress and temperature in these materials that provides fresh insights into the deformation and failure of glassy states under various physical conditions.<br><br>Pengfei Guan,christian louboutin shoes, Mingwei Chen and Takeshi Egami performed detailed molecular dynamics simulations for a metallic glass composed of zirconium,jordan shoes for sale, copper and aluminum under realistic conditions. In their simulation,longchamps sac, a melt at 1700 was cooled rapidly to produce a glassy alloy with a dense amorphous atomic packing, as seen in real samples. It is the disruption of this tight packing under shear stress that can lead to mechanical failure in these materials, so determining the exact mechanism of failure under shear could help solve the problem of brittleness in metallic glasses.<br><br>The researchers simulated changes in metallic glass viscosity by applying different rates of shear to their model under conditions of constant volume and temperature. According to Chen and Guan,jordan shoes, each data point in these simulations actually corresponds to the average result of many molecular dynamics runs, representing a daunting amount of computation. Through these simulations,christian louboutin uk, the team found that the atoms entered into a state of steady flow before reaching the breaking point. From results obtained over a range of temperatures,air jordan 11, they also revealed a surprisingly simple mathematical relationship between stress and temperature in these systems,nike tn, which allowed them to define the temperature boundaries of stable glassy phases (Fig. 1).<br><br>These findings suggest that stress has a similar effect to temperature in promoting and controlling atomic motion and mechanical flow in metallic glasses,cheap jordan shoes, even in the absence of heating or expansion an outcome with far reaching consequences, according to Egami. result directly challenges many conventional models, and demands serious re thinking of the atomistic mechanism of deformation in metallic glasses, he says.相关的主题文章： | ||
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"They've got more style than any group we've ever had."Many came into the competition looking good. But that doesn't mean they can escape getting pointers from the show's stylists some more than others.Nadia Turner, Jackson says, is this season's strongest example of a style maven who needs little help. | "They've got more style than any group we've ever had."Many came into the competition looking good. But that doesn't mean they can escape getting pointers from the show's stylists some more than others.Nadia Turner, Jackson says, is this season's strongest example of a style maven who needs little help. | ||
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