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  • 1
    Electronic Resource
    Electronic Resource
    Separation of Matter and Antimatter (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 1068-1069 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] With the possible exception of cosmic ray statistics1, observations yield essentially no information on the relative amounts of matter and antimatter beyond the solar system2. What the observations do tell us is that matter and antimatter are rarely, if ever, found together. Stringent upper limits ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2281068a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sex Discrimination (1971)
    [s.l.] : Nature Publishing Group
    Nature 234 (1971), S. 369-369 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-We were startled to read in your issue of October 29 (Nature, 233, xxii; 1971) an advertisement, placed by the Australian Atomic Energy Commission, describing a research post and ending with the statement "Female rates slightly less than male rate quoted". The fact that sex discrimination is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/234369a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Convective instability of a model chromosphere (1970)
    Springer
    Solar physics 14 (1970), S. 42-61 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The convective stability of a simple model chromosphere is investigated. The model chromosphere consists of protons, electrons, and hydrogen atoms in the ground state; ionization is collisional and recombination is radiative. The analysis indicates stability when the kinetic temperature (T) is less than 17 500K (assuming T increases with height). However, for T 〉 17 500K, the model chromosphere is overstable in the absence of magnetic fields provided the temperature inversion is sufficiently steep. For smaller values of the temperature gradient, field-free regions are stable if the density is small and monotonically unstable if it is large. In the presence of a magnetic field, the model chromosphere is monotonically unstable for T 〉 17 500K, regardless of the temperature gradient. The convective instability of the model chromosphere results from the fact that the plasma is thermally unstable for T 〉 17 500K. Thermally unstable regions of the solar atmosphere, although not represented in detail by the model, should behave in a similar fashion. Field-free regions of the solar chromosphere are probably not monotonically unstable, but overstability is possible and may explain the origin of chromospheric oscillations with periods less than 200 sec. It is suggested that spicules result from the monotonic instability of magnetic regions. A similar instability in the corona may be responsible for the large Doppler spreading of radar echoes. Elementary considerations of thermal balance predict that the temperature gradient should diverge at levels of marginal stability. The chromospheric region of spicule formation and the corona should therefore both be bounded below by abrupt temperature jumps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240159
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    Paper (German National Licenses)
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