Particle lock
A particle lock was a component of the transporter used by Starfleet in the mid-23rd century. It required the object or person to be stationary during transportation. 

During the destruction of Vulcan,  and  fell from the Naradas drilling rig, making it difficult to lock onto them.  was able to engage the lock in time before they hit the ground. ()

fr:Verrou de particules
Transporter technology