黑暗社会
发表于 2025-3-21 19:41:34
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惊奇
发表于 2025-3-21 23:27:42
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Hypopnea
发表于 2025-3-22 04:05:53
Outlook,e the angular resolution is discussed. A short overview compiles important research areas of radio astronomy and contributions to today’s world view of astronomy and cosmology. At the end, some hints are given on how one can actively engage in radio astronomy oneself – even outside of large-scale research institutions.
LEVY
发表于 2025-3-22 06:53:03
What Can You Observe with a Radio Telescope?,This chapter presents some elementary observations that can be made with a small radio telescope of the type that can be operated by colleges, observatories, and amateurs, in particular the radio emission from the Sun, from Cassiopeia A, and the 21-cm radiation from the Milky Way.
CLEAR
发表于 2025-3-22 11:45:36
Thomas LauterbachProvides a compact introduction to radio astronomy.Presents in an understandable way how a radio telescope works.Provides insight into the origins of astrophysical radio sources
压迫
发表于 2025-3-22 13:04:10
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exclamation
发表于 2025-3-22 19:24:13
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易弯曲
发表于 2025-3-22 22:33:18
Introduction: What Is Radio Astronomy?, discussed. These enabled the development of radio technology. When the short wave range began to be used, K. Jansky discovered the first signals of cosmic origin. Radio astronomy became established after 1945 and led to the discovery of numerous cosmic radio sources, the 21-cm radiation of hydrogen
Congruous
发表于 2025-3-23 03:54:44
What Are Electromagnetic Waves?,in which radio astronomical observations are possible..An important physical quantity used to describe electromagnetic waves is intensity, which describes the strength of the radiation..The different generation mechanisms and resulting properties of electromagnetic radiation from cosmic sources are
Antagonist
发表于 2025-3-23 06:03:40
How Does a Radio Telescope Work?,nd the so-called feed), the amplifiers and the measuring devices for the received power. Using the example of a software defined radio and digital signal processing, it is explained how a signal spectrum can be obtained..The concept of noise temperature is introduced. This allows the contributions o