Search results
Results From The WOW.Com Content Network
Minerals and mining also are important to Uzbekistan's economy. Gold, alongside cotton, is a major foreign exchange earner, unofficially estimated at 20% of total exports. [35] Uzbekistan is the world's seventh-largest gold producer, mining about 80 tons per year, and holds the fourth-largest reserves in the world.
In the United States a longer duty cycle is used, 50% for battery -powered buoys (20 seconds on, 20 seconds off) and 75% for on-shore beacons. Ramarks are wide-band beacons which transmit continuously on the radar bands without having to be triggered by an incoming radar signal.