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1 lis 2008 · Although the name conjures up hardware from a questionable science-fiction movie, the sophisticated vacuum tube generates microwaves powerful enough for military radars (for which it was ...
While “speculative fiction” was initially proposed as a name of a subgenre of science fiction, the term has recently been used in reference to a meta-generic fuzzy set supercategory—one defined not by clear boundaries but by resemblance to prototypical examples—and a field of cultural production.
It shows the development of science-fiction words and their associated concepts over time, with full citations and bibliographic information. Citations are drawn from science-fiction books and magazines, fanzines, screenplays, newspapers, comics, folk songs, and the Internet.
Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed.
13 wrz 2024 · The microwave region extends from 1,000 to 300,000 MHz (or 30 cm to 1 mm wavelength). Although microwaves were first produced and studied in 1886 by Hertz, their practical application had to await the invention of suitable generators, such as the klystron and magnetron.
21 wrz 2024 · Science fiction is a form of fiction that deals principally with the impact of actual or imagined science upon society or individuals. The term ‘science fiction’ was popularized, if not invented, in the 1920s by one of the genre’s principal advocates, the American publisher Hugo Gernsback.
10 sie 2016 · Microwaves are a portion or "band" found at the higher frequency end of the radio spectrum, but they are commonly distinguished from radio waves because of the technologies used to access them. Different wavelengths of microwaves (grouped into "sub-bands") provide different information to scientists.
