glossary  :  Q    
 
     
 

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acronym

  QAM : quadrature amplitude modulation : a modulation scheme which conveys data by changing (modulating) the amplitude of two carrier waves, usually sinusoids which are out of phase with each other by 90 (called quadrature carriers). In digital QAM, the sets of modulated amplitudes and selected phases of two carrier waves are used to transmit some binary numeral; then each signal transmitted can carry two or more bits (as many as 256 in 256-QAM modulation).

Latin                         acronym

QED : quod erat demonstrandum : which was to be demonstrated

Latin                         acronym

  QEF : quod erat faciendum : which was to be constructed

geography : physical

  quad : quadrangle : a four-sided area bounded by two lines of latitude (parallels) and two lines of longitude (meridians) on a map; the area shown on one of the standard topographic map sheets published by the US Geological Survey is approximately 17 miles (27 km) north to south and from 11 to 15 miles (17 to 24 km) east to west.

Latin                    abbreviation

q.v. : quod vide : which see

Latin                    noun phrase

quid pro quo : something for something
 
 

UPDATED : 2005-10-09

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