A Joint Task Force is a "joint" (multi-service) ad hoc military formation. The task force concept originated with the United States Navy in the 1920s and 1930s."Combined" is the British-American military term for multi-national formations. CTF – Commander Task Force, sometimes Combined Task Force CCTF – Commander Combined Task Force CJTF – Combined Joint Task Force There are two ways in which a U.S. or U.S.-allied task force may be assigned a number. The first is the originally naval scheme promulgated and governed by the Military Command, Control, Communications, and Computers Executive Board (MC4EB), chaired by the Joint Staff J6. Task force numbers allocated under this scheme form the majority of the listings below. The second is a by-product of the U.S. Army's procedure for forming task-organised forces for combat, differing from strictly doctrinally assigned table of organization and equipment organizations. A battalion, company or brigade commander has very wide latitude in selecting a task force name, though often the name of the commander is used (e.g. Task Force Faith; Task Force Smith was named for...

In classical music from Western culture, a diesis ( DY-ə-siss or enharmonic diesis, plural dieses ( DY-ə-seez), "difference"; Greek: δίεσις "leak" or "escape") is either an accidental (see sharp), or a very small musical interval, usually defined as the difference between an octave (in the ratio 2:1) and three justly tuned major thirds (tuned in the ratio 5:4), equal to 128:125 or about 41.06 cents. In 12-tone equal temperament (on a piano for example) three major thirds in a row equal an octave, but three justly-tuned major thirds fall quite a bit narrow of an octave, and the diesis describes the amount by which they are short. For instance, an octave (2:1) spans from C to C', and three justly tuned major thirds (5:4) span from C to B♯ (namely, from C, to E, to G♯, to B♯). The difference between C-C' (2:1) and C-B♯ (125:64) is the diesis (128:125). Notice that this coincides with the interval between B...

In electromagnetics, an antenna's gain is a key performance parameter which combines the antenna's directivity and radiation efficiency. The term power gain has been deprecated by IEEE. In a transmitting antenna, the gain describes how well the antenna converts input power into radio waves headed in a specified direction. In a receiving antenna, the gain describes how well the antenna converts radio waves arriving from a specified direction into electrical power. When no direction is specified, gain is understood to refer to the peak value of the gain, the gain in the direction of the antenna's main lobe. A plot of the gain as a function of direction is called the antenna pattern or radiation pattern. It is not to be confused with directivity, which does not take an antenna's radiation efficiency into account. Gain or 'absolute gain' is defined as "The ratio of the radiation intensity in a given direction to the radiation intensity that would be produced if the power accepted by the antenna were isotropically radiated". Usually this ratio is expressed in decibels with respect to an isotropic radiator (dBi). An alternative...