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Alcon offices in Johns Creek, Georgia. Alcon Inc. ( German: Alcon AG) is a Swiss-American pharmaceutical and medical device company specializing in eye care products. It has a paper headquarters in Geneva, Switzerland but its operational headquarters are in Fort Worth, Texas, United States, where it employs about 4,500 people. [2]
The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...
VOR/DME. In radio navigation, a VOR/DME is a radio beacon that combines a VHF omnidirectional range (VOR) with a distance-measuring equipment (DME). [1] The VOR allows the receiver to measure its bearing to or from the beacon, while the DME provides the slant distance between the receiver and the station. Together, the two measurements allow ...
The General Dynamics F-16 Fighting Falcon is an American single-engine supersonic multirole fighter aircraft originally developed by General Dynamics for the United States Air Force (USAF). Designed as an air superiority day fighter, it evolved into a successful all-weather multirole aircraft with over 4,600 built since 1976. [ 4]
The Raytheon MIM-23 HAWK ("Homing All the Way Killer") [2] is an American medium-range surface-to-air missile. It was designed to be a much more mobile counterpart to the MIM-14 Nike Hercules, trading off range and altitude capability for a much smaller size and weight. Its low-level performance was greatly improved over Nike through the ...
The Electric Reliability Council of Texas (ERCOT) manages the flow of electric power on the Texas Interconnection, that supplies power to 26 million Texas customers – representing 90 percent of the state's electric load. [3] ERCOT is the first independent system operator (ISO) in the United States [4] and one of nine ISOs in North America. [5]
There are 51 MTAs, 493 BTAs and 175 EAs in the United States. A: 1850–1865 MHz and 1930–1945 MHz (30 MHz) B: 1870–1885 MHz and 1950–1965 MHz (30 MHz) C: 1895–1910 MHz and 1975–1990 MHz (30 MHz, 15 MHz or 10 MHz) D: 1865–1870 MHz and 1945–1950 MHz (10 MHz) E: 1885–1890 MHz and 1965–1970 MHz. F: 1890–1895 MHz and 1970–1975 ...
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz ). Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio ...