cold-cathode magnetron
41Microelectromechanical system oscillator — Microelectromechanical system (MEMS) oscillators are timing devices that generate highly stable reference frequencies. These reference frequencies are used to sequence electronic systems, manage data transfer, define radio frequencies, and… …
42History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …
43Double layer (plasma) — This article is about the structure in plasma physics. For other uses, see Double layer. Saturnian aurora whose reddish colour is characteristic of ionized hydrogen plasma.[1] Powered by the Saturnian equivalent of (filamentary) Birkeland… …
44Edward George Bowen — Edward George Taffy Bowen, CBE, FRS (14 January, 1911 – 12 August, 1991) was a British physicist who made a major contribution to the development of radar and so helped win both the Battle of Britain and the Battle of the Atlantic.Early… …
45Weather radar — in Norman, Oklahoma with rainshaft …
