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みんなの日本語初級1 教え方の手引き Japanese for Everyone Japanese by スリーエーネットワーク PDF

By スリーエーネットワーク

ISBN-10: 4883191605

ISBN-13: 9784883191604

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The Navy operated, completely independently of the Army, its own network of stations, all Type-B sets, although towards the end of hostilities they were contemplating the installation of some Type-A systems. The coverage of their system in many cases duplicated that of the Army, but they were principally concerned with protecting their own installations. 6 Developments in Germany In Germany, the beat frequency phenomenon had been observed in 1934 when a ship passed through a decimeter radio beam.

Suppose several vessels are steaming along in company; it thus becomes evident that several of them will intercept the reflected ray and accordingly be warned of the presence of the submarine or submarines. Swords observes that Tesla appears not to have considered the attenuation suffered by radio waves propagating through water. Nevertheless, Tesla's idea clearly defines the concept of both bistatic and multistatic radar operation. S. Navy civilian engineers in 1922. It is summarized by Swords [ 159] from accounts by Guerlac [25] and Allison [164] as follows: In September 1922, Dr.

The phenomenon was described by Hyland as resulting from interference between a directly transmitted wave and a wave reflected or reradiated . . from the airplane.... The surprising fact was not that radio waves were reflected from aircraft—the laws of physics predicted this—but that the effect was large enough to be observed. In their discussions of the 1922 observations Taylor and Young had considered the possibility of plane detection, but thought that the energy from a plane would be too small.

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みんなの日本語初級1 教え方の手引き Japanese for Everyone Japanese by スリーエーネットワーク


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