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  • Fluorocarbons  (1)
  • Liquid crystals  (1)
  • 1
    Electronic Resource
    Electronic Resource
    One- and two-dimensional deformations in nematic liquid crystals: Influence of the flexoelectric polarization (1993)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 15 (1993), S. 1489-1506 
    Details
    ISSN: 0392-6737
    Keywords: Liquid crystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The elastic deformations in nematic liquid crystals are analysed in one and two dimensions. The influence of the flexoelectric polarization on the elastic properties of the medium is studied. It is shown that for one-dimensional deformations, the presence of the flexoelectric polarization introduces a renormalization of the elastic constants. On the contrary in the bidimensional case, the effect of the flexoelectricity is not a simple renormalization of the elastic constants. The profiles of the electric potential and of the tilt angle are evaluated for the cases in which the substrate is an insulating or conducting material. The validity of the calculations is discussed by considering the value of Debye's screening length of the nematic liquid crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451941
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ground level measurements of atmospheric concentrations of CCl2F2 and CCl3F in the wuppertal-Düsseldorf region (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 567-574 
    Details
    ISSN: 1420-9136
    Keywords: Fluorocarbons ; Local sources
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In the densely populated Wuppertal-Düsseldorf area the atmospheric concentrations of CCl2F2 and CCl3F near ground level were measured by ECGC and GC-MS method. Special systems for sampling and calibrating were developed. As mean concentration averages over the time period from December 1976 to May 1977 a value of 650±356 pptv was determined for CCl2F2 (F12) and of 490±279 pptv for CCl3F (F 11).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01636909
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    Paper (German National Licenses)
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