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  • 1
    Electronic Resource
    Electronic Resource
    Computer Image Processing (1979)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 17 (1979), S. 113-134 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.17.090179.000553
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  • 2
    Electronic Resource
    Electronic Resource
    Solar quiescent prominences at 10.7 GHz (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 758-759 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Although the filaments are very thin, subtending about 8 geocentric arc s when seen vertically, nevertheless, "regions of reduced radio brightness situated above filaments" were detected1 in 1959 and explained in terms of "relatively cold prominences which are optically thick to 8-mm radiation". ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290758a0
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  • 3
    Electronic Resource
    Electronic Resource
    The Sunspot Number Series (1953)
    [s.l.] : Nature Publishing Group
    Nature 171 (1953), S. 649-650 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The objects of analysis have been twofold: to discover a process which would yield a time series resembling the sunspot series, and to predict the future of the series, which incidentally would be very valuable in relation to telecommunications. No suggested process has been substantiated and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/171649a0
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  • 4
    Electronic Resource
    Electronic Resource
    Communications from Superior Galactic Communities (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 670-671 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SINCE Morrison and Cocconi1 published the suggestion that there might be advanced societies elsewhere in the Galaxy, superior to ourselves in technological development, who are beaming transmissions at us on a frequency of 1,420 Mc./s., Drake2 has described equipment under construction to look for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186670a0
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  • 5
    Electronic Resource
    Electronic Resource
    Detecting nonsolar planets by spinning infrared interferometer (1978)
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 780-781 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Reference data for the standard system are as follows (planet Jupiter in parentheses). Temperature 6,000 K (128 K), angular diameter 4.7xlO9 (4.7 x 1010), distance 3xl017m, angular separation 2.6xlO6. At maximum elongation, the visible planetary light is 2 x 10 9 of the starlight, assuming an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/274780a0
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  • 6
    Electronic Resource
    Electronic Resource
    Simulating the sunspot cycle (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 516-519 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The magnetic cycle, generally described as having a 22-yr period, consists of two '11-yr' semicycles. Equation (1) indicates that the durations of successive semicycles should diverge oppositely from the mean. Thus in odd-numbered semicycles, such as cycle 19 which began in 1954.2, the negative ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323516a0
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  • 7
    Electronic Resource
    Electronic Resource
    Lensless microwave imaging using the Hartley transform (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 617-619 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Because the wavelength we used (27.87 mm, corresponding to a frequency of 10.75 GHz) is -44,000 times greater than optical wavelengths, the arrangement of the apparatus is necessarily different. For image rotation a corner reflector is used instead of a lens and, in addition, it is possible to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335617a0
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  • 8
    Electronic Resource
    Electronic Resource
    The Maximum of the Planck Energy Spectrum (1954)
    [s.l.] : Nature Publishing Group
    Nature 174 (1954), S. 563-564 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is natural to inquire where this maximum falls, and Wien's law is usually called on to supply the answer. This law is often quoted in the form :XmT = 0-2897 cm. deg., where Xm is the wave-length where the maximum falls and T is the temperature of the black body. (Numerical values are based on ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/174563c0
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  • 9
    Electronic Resource
    Electronic Resource
    Possible High-frequency Modulation of Light from the Crab Pulsar (1971)
    [s.l.] : Nature Publishing Group
    Nature 229 (1971), S. 186-187 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In this model, the optical and X-ray radiation is produced by synchrotron radiation from electrons and positrons produced by y-ray annihilation in the strong magnetic field of the pulsar. The primary flux of charged particles, from the magnetic polar caps, is believed to be highly bunched, the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/229186a0
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  • 10
    Electronic Resource
    Electronic Resource
    Optical phase obtained by analogue Hartley transformation (1987)
    [s.l.] : Nature Publishing Group
    Nature 330 (1987), S. 735-737 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A transform proposed in 1942 by Hartley1 lay dormant until computer advances gave it relevance to spectral analysis2 and to numerical image processing3, where it possesses a speed advantage over the fast Fourier transform algorithm. Unlike the Fourier transform, which is complex, the Hartley ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/330735a0
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