this time around he built clever magnetic couplings. The couplings transmit torque from the motors on the inside to gears and props on the outside. And where the first version used a syringe-pump ...

he began to tinker with a system of moving a magnet back and forth through a tube with water pressure from a pump, which would then drive the pusher plate through magnetic coupling. This looked ...

Researchers in Sweden have analyzed how roll-bonded PVT collectors can act as secondary heat sources in ground-source heat pumps and have found they provide a better performance than conventional ...