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X-ray astronomy, which is an observational branch of astronomy, which deals with the study of X-ray emission from celestial objects. X-ray microscopic analysis, which uses electromagnetic radiation in the soft X-ray band to produce images of very small objects.
The two-rays ground-reflection model is a multipath radio propagation model which predicts the path losses between a transmitting antenna and a receiving antenna when they are in line of sight (LOS). Generally, the two antenna each have different height. The received signal having two components, the LOS component and the reflection component ...
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10 December – sinking of Prince of Wales and Repulse in the South China Sea: two Royal Navy capital ships, HMS Prince of Wales and HMS Repulse, are sunk by Japanese aircraft. 13 December. Battle of Cape Bon off Tunisia: two Italian cruisers are sunk without Allied losses. Britain declares war on Bulgaria.
A meridional ray or tangential ray is a ray that is confined to the plane containing the system's optical axis and the object point from which the ray originated. A skew ray is a ray that does not propagate in a plane that contains both the object point and the optical axis. Such rays do not cross the optical axis anywhere and are not parallel ...
Career highlights and awards. Cleveland Guardians Hall of Fame. Raymond Johnson Chapman (January 15, 1891 – August 17, 1920) was an American baseball player. He spent his entire career as a shortstop for the Cleveland Indians . Chapman was hit in the head by a pitch thrown by pitcher Carl Mays and died 12 hours later.
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