To See the Unseen: A History of Planetary Radar AstronomyNational Aeronautics and Space Administration, 1996 - Всего страниц: 301 |
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Стр. 232 - Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under contract with the National Science Foundation.
Стр. 3 - It seems to me that it should be possible to design apparatus by means of which a ship could radiate or project a divergent beam of these rays in any desired direction, which rays, if coming across a metallic object, such as another steamer or ship, would be reflected back to a receiver screened from the local transmitter on the sending ship, and thereby immediately reveal the presence and bearing of the other ship in fog or thick weather.
Стр. 18 - Center and modified by the Radio and Electrical Engineering Division of the National Research Council.
Стр. 78 - None of the funds authorized to be appropriated by this Act may be made available for the provision of assistance to El Salvador...
Стр. 295 - Technology, sponsored by the History of Science Society, the Society for the History of Technology, the...
Стр. 29 - Kompfner recognized that the perfection of the maser (an acronym for microwave amplification by stimulated emission of radiation) would reduce the power levels needed for the successful transmission of audible radio waves.