Titlebook: Radio Astronomy Techniques; R. N. Bracewell Book 1962 Springer-Verlag Berlin Heidelberg 1962 astronomy.radio astronomy.techniques

玷污

scrape

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

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HALO

上漲

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

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

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

Handbuch der Physik‘ Encyclopedia of Physicshttp://image.papertrans.cn/r/image/820606.jpg

糾纏,纏繞

https://doi.org/10.1007/978-3-662-39512-7astronomy; radio astronomy; techniques

promote

978-3-662-38653-8Springer-Verlag Berlin Heidelberg 1962