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magnetic resonance

(Encyclopedia) magnetic resonance, in physics and chemistry, phenomenon produced by simultaneously applying a steady magnetic field and electromagnetic radiation (usually radio waves) to a sample of…

track and field athletics

(Encyclopedia) track and field athletics or athletics, sports of foot racing, hurdling, jumping, vaulting, and throwing varied weights and objects. They are usually separated into two categories:…

Kent, George Edward Alexander Edmund, duke of

(Encyclopedia) Kent, George Edward Alexander Edmund, duke of, 1902–42, fourth son of George V of Great Britain. He traveled extensively as “salesman of the empire.” A member of the Royal Air Force…

farad

(Encyclopedia) faradfaradfărˈəd [key] [for Michael Faraday], unit of electrical capacitance, equivalent to 1 coulomb of stored charge per volt of applied potential difference.

Robertson, Sir William Robert

(Encyclopedia) Robertson, Sir William Robert, 1860–1933, British field marshal. He enlisted in the army in 1877 and became an officer in 1888. He was in the intelligence department in India (1892–96…

Macclesfield

(Encyclopedia) MacclesfieldMacclesfieldmăkˈəlzfēld [key], town (1991 pop. 46,832), Cheshire East, W England. Silk manufacture, of which Macclesfield is the principal center in England, was introduced…

Ducas

(Encyclopedia) DucasDucasdy&oomacr;ˈkəs [key], Greek family and dynasty of Constantinople. Some of its members were Byzantine emperors—Constantine X, Michael VII, Alexius V, and John III.

Gratz, Rebecca

(Encyclopedia) Gratz, RebeccaGratz, Rebeccagrăts [key], 1781–1869, American philanthropist, b. Philadelphia; daughter of Michael Gratz. Well known for her philanthropies in Philadelphia, she is…

paleomagnetism

(Encyclopedia) paleomagnetism, study of the intensity and orientation of the earth's magnetic field as preserved in the magnetic orientation of certain minerals found in rocks formed throughout…