Abstract: As planetary gear transmission system evolves toward high-speed and heavy-load applications, its internal structures become increasingly compact, leading to stronger coupling of dynamic ...

Add Yahoo as a preferred source to see more of our stories on Google. A composite view of Mars taken by the Viking I and II probes. NASA/USGS In September, NASA announced the discovery of a possible ...

Abstract: The complex motion modes of surface microwalkers rely on magnetic torque generated by rotating/oscillating magnetic fields. Actuation systems based on rotating permanent magnets exhibit ...

An interstellar comet that sparked speculation about extraterrestrial visitors has departed the solar system after making its closest approach to Earth at 270 million kilometres on December 19, with ...