A 5-MW motor using HTS (high-temperature-superconducting) wire and magnets has passed load- and ship-mission-testing protocols. American Superconductor designed the motor under an Office of Naval Research contract as an interim step toward a 36-MW, 49,000-hp, 120-rpm unit under development for ship propulsion. The goal is a propulsion system that has one-third the weight and one-half the size of conventional copper-based motors of the same rating.
The 5-MW motor underwent static and dynamic tests at the Center for Advanced Power Systems at Florida State University (Tallahassee). Alstom Power Conversion's (www.powerconv.alstom.com) Rugby, UK, facility designed, built, and conducted further tests on the stator- and marine-drive electronics. In the static tests, the motor ran at full load and speed, 230 rpm, for 21 hours; resultant temperature and performance data agreed with design predictions. In the dynamic test, the test station imposed load variations of 0.5 to 10 percent around moderate- and full-power operating points. Testing also used hardware-in-the-loop simulation to control the motor and emulate complete propulsion-system operation.
Samsung's Galaxy line of smartphones used to fare quite well in the repairability department, but last year's flagship S5 model took a tumble, scoring a meh-inducing 5/10. Will the newly redesigned S6 lead us back into star-studded territory, or will we sink further into the depths of a repairability black hole?
In 2003, the world contained just over 500 million Internet-connected devices. By 2010, this figure had risen to 12.5 billion connected objects, almost six devices per individual with access to the Internet. Now, as we move into 2015, the number of connected 'things' is expected to reach 25 billion, ultimately edging toward 50 billion by the end of the decade.
NASA engineer Brian Trease studied abroad in Japan as a high school student and used to fold fast-food wrappers into cranes using origami techniques he learned in library books. Inspired by this, he began to imagine that origami could be applied to building spacecraft components, particularly solar panels that could one day send solar power from space to be used on earth.
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