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  • 1
    Electronic Resource
    Electronic Resource
    Results of the studies of monsoon circulation with radon as a tracer (1984)
    Springer
    Pure and applied geophysics 122 (1984), S. 124-132 
    Details
    ISSN: 1420-9136
    Keywords: Monsoon ; Radon ; MONEX ; Equator ; Arabian Sea ; Indian ocean ; Interhemispheric mixing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Radon-222 activity levels have been measured at deck level in regions of the Arabian Sea, Indian Ocean, and Bay of Bengal during the summer monsoon periods of 1973, 1977, and 1979, as part of the Monex programme. The aim of the measurements was to find the source regions of the monsoon air and the variations in its composition under different synoptic conditions. The radon data confirm that the monsoon air is predominantly of southern-hemisphere origin, with a small continental component. The continental component, as indicated by radon values, increases at higher latitudes and seems to vary with different circulation patterns in the synoptic scale. The use of radon as a tracer in monsoon studies is thus demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879653
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structural changes in the complexation of benzo-crown ethers - NOESY and variable-temperature 13C NMR study (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 656-666 
    Details
    ISSN: 0749-1581
    Keywords: Benzo-crown ethers ; NOESY and variable-temperature ; 13C NMR ; Complexation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structural changes during the complexation of benzo-crown ethers with Cs+, K+ and Na+ were studied by NOESY and variable-temperature 13C NMR spectroscopy. It was found that, on complexation, the distance between the CH-α and 1-CH2 is reduced in dibenzo-24-crown-8 (DB24C8), dibenzo-18-crown-6 and benzo-15-crown-5. Two mechanisms have been proposed for the distance reduction, the fluttering motion of the benzo group and the elongation of the crown moiety. However, it is concluded that both of these mechanisms seem to play a role in the distance reduction. In the complexed state of DB24C8 with Cs+, Cs+ is predicted to be slightly above the plane of the crown oxygens with respect to DB24C8.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290704
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spectral separation of two very closely related organic compounds by 1D TOCSY (1994)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 32 (1994), S. 452-457 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; 1D TOCSY ; z-Filtering ; 2,7-Dioxatetracyclo[3.3.04,9.08,11]undeca-3,6-dione ; 8,10,11-Trioxapentacyclo[5.4.1.02,6.04,11.05,9]dodecane ; 2,8-Dioxatetracyclo[3.3.3.06.0.03,10]undecan-4-ol ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of one-dimensional total correlation spectroscopy (1D TOCSY) combined with the z-filtration technique to generate pure phase subspectra of individual isomers from the spectrum of the corresponding mixture without any chemical separation of the mixture is described. A straightforward spectral assignment is achieved for the isomers obtained on lithium aluminium hydride reduction of 2,7-dioxatetracyclo[3.3.04,9.08,11] undeca-3,6-dione (dilactone) by studying the subspectrum of each isomer as a function of the propagation time of magnetization through the network of coupled protons.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260320804
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    Paper (German National Licenses)
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