A self-healing system for concrete developed in Europe was inspired by a Dutch researcher’s trip to Yellowstone National Park in Wyoming. As concrete ages, water seeps into cracks, which widen as the water freezes and thaws. In the new approach, specific organic mineral precursor compounds plus spore-forming alkaliphilic bacteria are incorporated into concrete during the manufacturing process. They produce calcite particles up to 100-μm in size that are shown to seal micro- to even larger-sized cracks. Erik Schlangen, a professor at Delft Technical University in The Netherlands said he got the idea after seeing deposits of calcite near geysers at Yellowstone. The improvement in crack resistance is said to more than compensate for a 10 percent loss in compressive strength due to incorporation of the bacteria, says Schlangen. The approach will also reduce the amount of raw materials used in concrete.
The company that brought you 3D-printed eyeglasses has launched both an improved clear polymer material for 3D printing optical components and a high-speed, precision, 3D-printing process for making small- and medium-sized batches in a few days.
We've found an amazing variety of robot hands & arms in medicine, space, and service robots, as well as R&D and assembly. Some are based on industrial designs modified for speed or dexterity, while others more closely emulate human movements, as well as human size and shape.
To give engineers a better idea of the range of resins and polymers available as alternatives to other materials, this Technology Roundup presents several articles on engineering plastics that can do the job.
The first photos made with a 3D-printed telescope are here and they're not as fuzzy as you might expect. A team from the University of Sheffield beat NASA to the goal. The photos of the Moon were made with a reflecting telescope that cost the research team £100 to make (about $161 US).
A tiny humanoid robot has safely piloted a small plane all the way from cold start to takeoff, landing and coming to a full stop on the plane's designated runway. Yes, it happened in a pilot training simulation -- but the research team isn't far away from doing it in the real world.
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