Provided is a dual spinning laser-based unmanned aerial vehicle (UAV) positioning and landing system including a first laser module, a first rotating module, a second laser module, a second rotating module, a signal transceiver, a controller and a substrat...

An active contact pressure control wheel structure includes an axle, an axle barrel, a rim, an outer tire, at least two inflation inner tubes, at least two gas output pipe assemblies, and at least two gas input pipe assemblies. The axle includes at least t...