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  • 1
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 7-hydroxyflavone monohydrate, C14H10O3·H2O (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 931-933 
    Details
    ISSN: 1572-8854
    Keywords: Flavone ; hydrate ; hydrogen bonding ; X-ray crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The X-ray crystal structure of 7-hydroxyflavone monohydrate, C14H10O3 · H2O, is determined. The compound crystallizes in the monoclinic space group, P21/n with a = 3.801(3), b = 19.665(4), c = 16. 039(6), β = 93.69(3)°, and μ = 0.68 mm−1 for Z = 4. The phenyl ring of the flavone moiety is rotated 18.6(1)° out of the penzopyran plane, which is a typical value for flavones. In the crystal lattice, there are wide channels which are lined mainly by C–H groups. The water molecules enclosed in these channels are severely disordered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022862805864
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular structure and crystal packing of uncomplexed 1,6-bis(N-cyano-p-methoxy-anilino)-2,4-hexadiyne, C22H18N4O2 (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 149-152 
    Details
    ISSN: 1572-8854
    Keywords: Hexadiyne ; C–H···N hydrogen bonding ; X-ray crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The X-ray crystal structure of 1,6-bis(N-cyano-p-methoxy-anilino)-2,4-hexadiyne, C22H18N4O2, is determined. The crystal packing is dominated by phenyl stacking interactions. Weak C–H···N hydrogen bonds help align the molecules. C–H···π hydrogen bonding is not apparent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022450015853
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  • 3
    Electronic Resource
    Electronic Resource
    The hydrogen bonding in 1-ethynyl-2-(2′-carbethoxy-1′-vinyl)-2,3-dimethyl-6-isopropyl-cyclohexan-1-ol (1998)
    Springer
    Journal of chemical crystallography 28 (1998), S. 235-238 
    Details
    ISSN: 1572-8854
    Keywords: Cyclohexane ; alkyne ; hydrogen bonding ; X-ray crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The X-ray crystal structure of the title compound, C18H28O3, is determined. The hydrogen bond scheme does not follow considerations based on hierarchies of donor and acceptor strengths. The hydroxyl group of the molecule accepts only very weak C–H···O interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022434713804
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  • 4
    Electronic Resource
    Electronic Resource
    Dalspinin, an isoflavone from Dalbergia spinosa roots (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 99-102 
    Details
    ISSN: 1572-8854
    Keywords: Isoflavone ; natural compound ; Dalbergia spinosa ; X-ray crystal structure ; hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The X-ray crystal structure of the plant isoflavone dalspinin from Dalbergia spinosa is determined. The compound, C17H12O7, is monoclinic in P21/n with a = 3.970(1), b = 23.607(5), c = 14.633(3) Å, β = 94.46(3)°, V = 1367.2(5) Å3, D calc = 1.595 g cm−1 and Z = 4. The molecular structure is characterized by a short intramolecular O–H···O=C hydrogen bond, and a large tilt angle of the two rigid ring systems with respect to each other. The intermolecular interactions in the crystal are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009583617486
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  • 5
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    Some studies of zonal and meridional wind characteristics at low latitude Indian stations (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: At the beginning of the Indian Middle Atmosphere Programme (IMAP), it was decided that the preparation of consolidation reports of already available parameters for the middle atmosphere would be useful. Atmospheric wind data obtained by rockets and balloons constituted one such parameter which had to be consolidated. The present paper summaries the results of this consolidation study. Both zonal and meridional components of winds at four low latitude Indian stations namely Thumba, Shar, Hyderabad, and Balasore, have been analyzed to yield reference wind profiles for each month. The montly mean values have been used to bring out the amplitudes and phases of the annual, semiannual and quasi-biennial oscillations.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions Handbook for MAP, Vol. 18; 4 p
    Format: text
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  • 6
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    The morphology of metallic ions in the upper atmosphere (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Analysis of metallic ion data from a day-night pair of rockets, OGO 6, and the elliptic phases of AE-C and AE-D shows the presence of Fe(+) ions at altitudes above 400 km only at low magnetic latitudes. The detection probability of this ion decreases with altitude, with a maximum over the Atlantic and a minimum over India; the rocket data indicate ions in the E region during the day and on the bottom of the F layer at night. Mg(+) and Fe(+) are the dominant ions below 250 km at all latitudes, but Al(+), Na(+), Si(+), and Ca(+) are also detectable; a correlation was found between solar activity and metallic ion detection probability at low latitudes and high altitudes at night
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 85; Dec. 1
    Format: text
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  • 7
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    Diurnal variation of galactic cosmic ray intensity on quiet days (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A detailed study of the diurnal variation on long term basis was performed on geomagnetically quiet days using the experimental data of the cosmic ray intensity from the worldwide neutron monitoring stations. During the period when the polarity of the solar magnetic field in the Northern Hemisphere of the sun is negative the phase and amplitude of the diurnal anisotropy on quiet days was observed to remain almost constant. When the polarity of solar magnetic field in the Northern Hemisphere changes from negative to positive, a shift in the phase of the diurnal anisotropy on quiet days towards earlier hours is observed and the shift is found to be maximum during minimum solar activity periods 1953-54 and 1975-76. When the polarity of solar magnetic field changes from positive to negative in the Northern Hemisphere of the Sun the phase of the diurnal anisotropy on quiet days recovers to its usual direction of corotational anisotropy and is observed to remain almost constant till the polarity of the solar magnetic field does not change.
    Keywords: SPACE RADIATION
    Type: SH-4.5-11 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 126-129; NASA-CP-2376-VOL-5
    Format: application/pdf
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  • 8
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    Study of spectral exponent on quiet and disturbed days (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The spectral exponents of the diurnal and semidiurnal anisotropies are studied on quiet and disturbed days for a period from 1964 to 75. It has been observed for the diurnal anisotropy that the spectral exponent for quiet days is 0.0 from 1964 to 70, however during 1971 and onwards its value is found different from zero and is -0.4; for disturbed days the spectral exponent is observed to be 0.0 from 1964 to 75 with an exception of the year 1966. Further, it has been observed for the semi-diurnal anisotropy that the best value for the spectral exponent on quiet days being + 0.6 from 1964 to 74; however on disturbed days the value of spectral exponent is sometimes negative or positive but different from zero. It was derived from the present investigation that superimposed on the corotational anisotropy, expected from a balance between outward radial convection and inward field aligned diffusion, there is an additional component operating during the period under consideration.
    Keywords: SPACE RADIATION
    Type: SH-4.5-10 , NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5; p 125
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  • 9
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    Comparative study of the phase of diurnal anisotropy on quiet and disturbed days on a long term basis up to recent period (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The data from the world wide grid of neutron monitoring stations was analyzed for a comparative study of the phase of diurnal anisotropy on quiet and disturbed days on a long term basis up to recent period. It has been observed that the phase of the diurnal anisotropy on disturbed days where the value of the Ap-index is higher, is found to shift towards earlier hours in comparison to the phase of the diurnal anisotropy on quiet days where the value of Ap-index is lower on all the stations from 1965 to 71. Such a trend is not observable for the later period. This affect is found to be more pronounced on equatorial stations, in particular, in comparison to high latitude stations. It was derived from these observational facts that the relationship between Ap-index and the phase of the diurnal anisotropy is not invariant throughout the period of consideration. Furthermore, the exact cause of such a drastic change is not known, but it demonstrates very clearly that the interplanetary conditions which are responsible for both, diurnal anisotropy of cosmic ray intensity and the geomagnetic Ap-index variation, have drastically changed during the period 1971 and onwards.
    Keywords: SPACE RADIATION
    Type: SH-4.5-9 , NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 5; p 124
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  • 10
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    Evidence for an interstellar or interplanetary source of diffuse He I 584 A radiation. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 183; July 15
    Format: text
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