Thursday, December 6, 2007

Science, October 12, 2007


Cover
A montage of images of Jupiter and its volcanic moon Io, taken from the spacecraft New Horizons. On Jupiter, high-altitude clouds are shown in blue and deeper clouds in red. The bluish-white oval is the Great Red Spot. Just visible in the Io image is an ongoing volcanic eruption on its nightside, in which incandescent lava glows red beneath a high volcanic plume lit by sunlight.

Excitation of Lunar Eccentricity by Planetary Resonances
As the orbit of the Moon around Earth expanded, it passed through gravitational resonances from Venus and Jupiter, explaining the Moon's present high-orbital eccentricity.

Dislocation Avalanches, Strain Bursts, and the Problem of Plastic Forming at the Micrometer Scale
The sudden bursts of dislocations seen in deforming crystals do not occur in crystals smaller than about 1 micrometer, making it difficult to shape or form small samples.

Microfluidic Adhesion Induced by Subsurface Microstructures
Air- or oil-filled channels beneath the surface of a rubbery film greatly improve its adhesion to other surfaces by arresting cracks and generating stresses at the interface.

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