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Two Brothers Software, Providing Ergonomic Software including utilities and games, and web optimization since 2003
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News for nerds, stuff that matters

3D-Printed Gun Earns Man Two Years In Japanese Prison
by Soulskill
21 Oct 2014 at 5:21am
jfruh writes: Japan has some of the strictest anti-gun laws in the world, and the authorities there aim to make sure new technologies don't open any loopholes. 28-year-old engineer Yoshitomo Imura has been sentenced to two years in jail after making guns with a 3D printer in his home in Kawasaki.

Read more of this story at Slashdot.









Australian Physicists Build Reversible Tractor Beam
by Soulskill
21 Oct 2014 at 3:33am
An anonymous reader writes: Physicists at Australian National University have developed a tiny tractor beam that improves in several ways upon previous attempts. First, it operates on scales which, while still tiny, are higher than in earlier experiments. The beam can move particles up to 200 microns in diameter, and it can do so over a distance of 20 cm. "Unlike previous techniques, which used photon momentum to impart motion, the ANU tractor beam relies on the energy of the laser heating up the particles and the air around them (abstract). The ANU team demonstrated the effect on gold-coated hollow glass particles. The particles are trapped in the dark center of the beam. Energy from the laser hits the particle and travels across its surface, where it is absorbed creating hotspots on the surface. Air particles colliding with the hotspots heat up and shoot away from the surface, which causes the particle to recoil, in the opposite direction. To manipulate the particle, the team move the position of the hotspot by carefully controlling the polarization of the laser beam."

Read more of this story at Slashdot.










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