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  • Digitale Medien  (6)
  • 1970-1974  (6)
  • 1973  (6)
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Materialart
  • Digitale Medien  (6)
Erscheinungszeitraum
  • 1970-1974  (6)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Metastable ions in a MS-30 double beam mass spectrometer (1973)
    s.l. : American Chemical Society
    Analytical chemistry 45 (1973), S. 627-629 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac60325a040
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  • 2
    Digitale Medien
    Digitale Medien
    Quantum Dynamical Theory of Molecular Collisions (1973)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 24 (1973), S. 263-300 
    Details
    ISSN: 0066-426X
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.pc.24.100173.001403
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  • 3
    Digitale Medien
    Digitale Medien
    Physical Chemistry in Cambridge, Massachusetts (1973)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 24 (1973), S. 1-29 
    Details
    ISSN: 0066-426X
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.pc.24.100173.000245
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  • 4
    Digitale Medien
    Digitale Medien
    Studies of the solar chromosphere from millimetre and sub-millimetre observations (1973)
    Springer
    Solar physics 31 (1973), S. 319-338 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A compilation of brightness temperature data in the millimetre and sub-millimetre wavelength ranges is used to obtain an empirical relation T B = Cλ n between brightness temperature and wavelength, valid between 1 mm and 1 cm. An analytically soluble model, giving electron temperatures and densities between 1500 km and 4000 km above the photosphere is derived from this relationship, and eclipse data of Thomas and Athay, of the emission at the head of the Balmer continuum. Although this over-simplified model lacks precision in the height co-ordinate, it allows a scale height of around 1000 km for electrons to be deduced, and supplies a convincing test for the absence of hydrostatic equilibrium throughout the region. A more comprehensive and reliable though still simplified numerical model is then presented, being a modification of previous models accounting only for millimetre data. It shows marked departure from UV derived models in this region, and an explanation for the discrepancy is proposed in terms of thermal inhomogeneities on the scale of the chromospheric supergranulation. The stratified model is then geometrically modified to account for observed centrelimb profiles of the Sun measured throughout the sub-millimetre and millimetre region. The scale of any roughness thus introduced is related to the notable lack of millimetric limb brightening, and observational tests for that scale are suggested here. A qualitative picture of this part of the chromosphere is proposed, consistent with existing observations in the millimetre, visible and UV regions of the spectrum.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00152810
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  • 5
    Digitale Medien
    Digitale Medien
    An ab initio molecular orbital study of the C2F2 species: The difluorovinylidene → difluoroacetylene rearrangement (1973)
    Springer
    Theoretical chemistry accounts 29 (1973), S. 183-187 
    Details
    ISSN: 1432-2234
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract An ab initio MO study, using medium size Gaussian basis sets has been made of vinylidene carbene, acetylene and the isomeric cyclic intermediate presumed to represent the transition state of their interconversion reaction, along with their perfluorinated analogs. The total energies of the acetylenes are lower than the vinylidenes and the estimated activation energy of their interconversion is considerably higher for the fluorinated molecules. The results are in line with experimental observations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00529441
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  • 6
    Digitale Medien
    Digitale Medien
    Studies in seed dormancy (1973)
    Springer
    Planta 110 (1973), S. 303-310 
    Details
    ISSN: 1432-2048
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary ABA has been identified by GLC-MS and routinely determined by GLC as one of several inhibitory substances in the testa and pericarp of hazel nuts. Its concentration in newly harvested nuts, which had not developed embryo dormancy, was 19.0 nmoles/g dry weight for the testa, 1.4 nmoles/g for the pericarp and 0.09 nmoles/g for the embryo. Dry storage of the nuts resulted in the development of embryo dormancy together with a slight loss of ABA. On imbibition of dormant nuts at 5° C and 20° C there was a 61% loss of ABA from the testa and pericarp in both cases. However the 5° C imbibition resulted in the breaking of seed dormancy while the 20° C imbibition had no effect on the dormancy. The ABA of the testa and pericarp seems to be concerned with the maintenance of seed dormancy prior to the onset of embryo dormancy. Subsequent to the onset of embryo dormancy, ABA seems to show little effect on either the maintenance or breaking of seed dormancy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00387058
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