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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth
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日期:2024-07-15
QUIET WITH A CHANCE OF FLARES: Solar activity has been low for days. The sunspot most likely to break the quiet is AR2230. Not only is the sunspot growing rapidly, but also it has an unstable 'beta-gamma' magnetic field that harbors energy for M-class sol...
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日期:2024-07-14
Shadi-Bagiar-at-the-entrance-to-the-Khyber-Pass,-taken-by-John-Burke-in-1878...
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日期:2024-07-18
Directed by Phil Alden Robinson. With Kevin Costner, Amy Madigan, Gaby Hoffmann, Ray Liotta. An Iowa corn farmer, hearing voices, interprets them as a command to build a baseball diamond in his fields; he does, and the Chicago Black Sox come....
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日期:2024-07-11
Field regions for the radiation pattern of antennas are discussed The far field and near field in particular, are defined in terms of distance from an antenna....
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日期:2024-07-11
Any antenna can be successfully measured on either a near-field or far-field range, with ... this makes generalized comparisons between near-field and far-field ......
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日期:2024-07-14
This is why the far field wave front is considered planar and ... crossover distance between near and far fields (R ) is taken to be where the phase error is 1/16 of ......
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日期:2024-07-13
Near field and far field communications both rely on electromagnetic fields to transmit information, but a key difference sets NFC apart from far field ......
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日期:2024-07-13
Scientific evidence supporting near-death experiences, the afterlife and survival after death. ... Dr. Bruce Greyson documented perhaps one of the most compelling examples of a person who had a NDE and observed events while outside of his body which were ...