Пёрселл-фактор — (Purcell factor) в квантовой электродинамике увеличение скорости испускания осциллятора в резонаторе по сравнению со скоростью спонтанного излучения в свободное пространство.[1] Скорость испускания осциллятора в резонаторе умножается на… … Википедия
Microwave cavity — A microwave cavity is a closed metal structure that confines electromagnetic fields in the microwave region of the spectrum. Such cavities act as resonant circuits with extremely low loss at their frequency of operation. Their Q factor may reach… … Wikipedia
Relativistic electromagnetism — is the idea of explaining electromagnetism based on relativistic (Albert Einstein 1905) arguments. It was first put forward in 1963 by Edward M. Purcell who wrote an innovative electromagnetism text in which he used special relativity to derive… … Wikipedia
theatre music — ▪ musical genre Introduction any music designed to form part of a dramatic performance, as, for example, a ballet, stage play, motion picture, or television program. Included are the European operetta and its American form, the musical… … Universalium
ancient Greek civilization — ▪ historical region, Eurasia Introduction the period following Mycenaean civilization, which ended in about 1200 BC, to the death of Alexander the Great, in 323 BC. It was a period of political, philosophical, artistic, and scientific… … Universalium
Bill Clinton — William Clinton redirects here. For other uses, see William Clinton (disambiguation). Bill Clinton … Wikipedia
Michael Tippett — Sir Michael Kemp Tippett OM CH CBE (2 January 1905 – 8 January 1998) was an English composer. Michael Tippett In his long career he produced a large body of work, including five operas, three large scale choral works, four symphonies, five string … Wikipedia
performing arts — arts or skills that require public performance, as acting, singing, or dancing. [1945 50] * * * ▪ 2009 Introduction Music Classical. The last vestiges of the Cold War seemed to thaw for a moment on Feb. 26, 2008, when the unfamiliar strains … Universalium
cañada — /keuhn yah deuh, yad euh/, n. Chiefly Western U.S. 1. a dry riverbed. 2. a small, deep canyon. [1840 50; < Sp, equiv. to cañ(a) CANE + ada n. suffix] * * * Canada Introduction Canada Background: A land of vast distances and rich natural resources … Universalium
Canada — /kan euh deuh/, n. a nation in N North America: a member of the Commonwealth of Nations. 29,123,194; 3,690,410 sq. mi. (9,558,160 sq. km). Cap.: Ottawa. * * * Canada Introduction Canada Background: A land of vast distances and rich natural… … Universalium
