玷污
发表于 2025-3-23 12:05:04
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scrape
发表于 2025-3-23 14:51:40
Theory of aerial smoothing,may be concerned with a large part of the sky, as when making a galactic survey, or only a small part, as when studying the emission from discrete objects or sets of objects. We may also be concerned with the spectrum and the polarization and time dependence of strength, spectrum and polarization. I
全面
发表于 2025-3-23 19:18:56
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HALO
发表于 2025-3-24 01:22:55
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上涨
发表于 2025-3-24 03:54:49
Receivers,itable to the needs of the indicating instrument. Furthermore one relies on the receiver to select the narrow band of high frequencies to which attention is to be directed. Among the necessary functions of a receiver, therefore, are (i) amplification, (ii) frequency conversion, (iii) tuning, (iv) selectivity.
Acquired
发表于 2025-3-24 07:03:42
Aerials,assumes a different importance; highly directional properties are called for; and methods of mounting and driving the aerial are quite distinctive. The various techniques practiced between 104 and 107 Hz do not concern us here.
河潭
发表于 2025-3-24 12:42:11
Theory of aerial smoothing,n of position on the sky. This includes galactic surveys and the determination of position, size, and brightness distribution of discrete sources at a single frequency. All other types of measurement then reduce, at least in principle, to repetition on other frequencies, at other times, and with differently polarized aerials.
gusher
发表于 2025-3-24 17:03:15
Handbuch der Physik‘ Encyclopedia of Physicshttp://image.papertrans.cn/r/image/820606.jpg
纠缠,缠绕
发表于 2025-3-24 19:57:13
https://doi.org/10.1007/978-3-662-39512-7astronomy; radio astronomy; techniques
promote
发表于 2025-3-25 00:03:33
978-3-662-38653-8Springer-Verlag Berlin Heidelberg 1962