Results 201 to 210 of about 164,762 (248)
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2007
Radio astronomy is defined and a short review of certain types of radio telescopes from single dishes to huge arrays is offered to give a sense of what radio astronomers do and what they observe.
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Radio astronomy is defined and a short review of certain types of radio telescopes from single dishes to huge arrays is offered to give a sense of what radio astronomers do and what they observe.
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Radio astronomy at the University of Sydney
Astrophysics and Space Science, 1986The recent improvements to the radio telescopes at the Molonglo (MOST) and Fleurs (FST) Observatories are described along with some of the astronomical projects.
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Introduction to Radio Astronomy
Physics Bulletin, 1967R. C. Jennison New York: Philosophical Library Inc. 1967 Pp. viii + 160. Price $4.75. In the last twenty years radio astronomy has developed into one of the most fascinating areas and growing points of modern scientific research. There have already appeared several popular books on the subject, also one or two text books of an advanced nature, but ...
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Physics Bulletin, 1978
David L Jauncey (ed) Dordrecht, Holland: D Reidel 1977 pp xx + 398 price $38 (cased) $19.50 (paperback)
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David L Jauncey (ed) Dordrecht, Holland: D Reidel 1977 pp xx + 398 price $38 (cased) $19.50 (paperback)
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2017
In Germany in 1904, Christian Hulsmeyer used a copy of Hertz’s apparatus to demonstrate the reception of radiation reflected from a ship, thereby introducing a first primitive version of radar, albeit without range information. In the early years of the twentieth century, the ingenious inventor Guglielmo Marconi (1874–1937) was instrumental in the ...
Jacob W. M. Baars, Hans J. Kärcher
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In Germany in 1904, Christian Hulsmeyer used a copy of Hertz’s apparatus to demonstrate the reception of radiation reflected from a ship, thereby introducing a first primitive version of radar, albeit without range information. In the early years of the twentieth century, the ingenious inventor Guglielmo Marconi (1874–1937) was instrumental in the ...
Jacob W. M. Baars, Hans J. Kärcher
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Radio-Astronomy and Navigation
The Journal of the Royal Aeronautical Society, 1958The difficulties of determining latitude and longitude under adverse weather conditions, when neither the Sun nor stars can be sighted, are well-known, and the advantages of a non-visual system of position finding which could operate through clouds or fog are too obvious to require emphasis.A Radio Sextant, which detects and locks-on to 8 mm. radiation
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1965
Publisher Summary This chapter deals with solar activity, describing the radio emission related to sunspots and flares in the different frequency ranges. In the laboratory, many mechanisms are available for the generation of radio waves, however only a few of them seem to be efficient enough in the solar atmosphere to give intensity detectable at the
J.F. Denisse, A. Boischot
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Publisher Summary This chapter deals with solar activity, describing the radio emission related to sunspots and flares in the different frequency ranges. In the laboratory, many mechanisms are available for the generation of radio waves, however only a few of them seem to be efficient enough in the solar atmosphere to give intensity detectable at the
J.F. Denisse, A. Boischot
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Instrumentation for radio astronomy
Physics Today, 1966T HE WORLD'S FIRST radiotelescope designed specifically for astronomical observations was built in 1937, a few years after Karl Jansky's pioneering discovery of radio waves from the Milky Way. The radiotelescope was conceived by Grote Reber who built the instrument practically unaided in his own back yard at Wheatstone, Illinois. It consisted (figure 1)
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1989
The result of any measurement is a function not only of what one wants to measure but also of the system used to make the measurements. This is a thoroughly undesirable state of affairs because, in science, we demand that others can repeat experiments and come to the same conclusions.
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The result of any measurement is a function not only of what one wants to measure but also of the system used to make the measurements. This is a thoroughly undesirable state of affairs because, in science, we demand that others can repeat experiments and come to the same conclusions.
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Nature, 1961
Astronomy differs from most sciences in that we cannot do exper 2\. iments; the astronomer must build up from his existing ob servations a picture or ' 'model" of the Universe, and then look for further effects which should be observable if his model were correct. Although in 700 b.c.
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Astronomy differs from most sciences in that we cannot do exper 2\. iments; the astronomer must build up from his existing ob servations a picture or ' 'model" of the Universe, and then look for further effects which should be observable if his model were correct. Although in 700 b.c.
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