Bore hole drilling machine (DDW-600) DDW-600 drilling rig is the integral steel-tracked chassis model with powerful mobile capability; advanced negative feedback 1  ... DW/TXS Construction Equipment (Beijing) Co., ...
Levitation. Maglev trains have no contacts with the rails while they move forward. They are levitated on the guide-way with the help of magnetic forces. Levitation is the process by which an object is suspended against gravity in a stable position without any physical contact.
Superconductors. Maglev trains are held just above the tracks by powerful superconducting electromagnets. At low temperatures, some metals can become superconductors. They will have little or no electrical resistance. For example, mercury is a liquid metal.It solidifies at â38.8 Â°C and becomes a superconductor at â268.8 Â°C.hey will have little or no electrical resistance. For example, mercury is a liquid metal. It solidifies at â38.8 Â°C and becomes a superconductor at â268.8 Â°C.