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  • 1
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    Traces of seismic effects on archaeological sites in Bulgaria (2006)
    Details
    Publication Date: 2019-11-04
    Description: JCR Journal
    Description: open
    Keywords: Bulgaria ; paleoseismicity ; archaeology ; geomorphology ; 05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 3745294 bytes
    Format: application/pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Torsion induced gyrotropy in hexagonal CdS (1994)
    Springer
    The European physical journal 93 (1994), S. 321-326 
    Details
    ISSN: 1434-6036
    Keywords: 78.20.Ek ; 78.20.Fm ; 42.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mechanically induced gyrotropy is studied in crystal plates of hexagonal CdS near the frequency of isotropic point (in which the refractive indices of the ordinary and extraordinary waves are equal). The transmittance of light by torsion deformed crystal (when the torsional moment is orientated along the opticalc-axis) between two crossed polarizers is measured as well as the polarization parameters of elliptically polarized emergent light. In the discussion the hypothesis that the mechanical deformation induces gyrotropy is argued. The experimental results are interpretated in the frameworks of the theory of the elliptical birefringence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312702
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetogyrotropy in twisted CdS crystals (1994)
    Springer
    The European physical journal 94 (1994), S. 65-68 
    Details
    ISSN: 1434-6036
    Keywords: 78.20.Ek ; 78.20.Ls ; 78.20.Ci
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper the optical activity (gyrotropy) induced by a simultaneous action of a magnetic field and a torsion in hexagonal CdS crystals has been investigated. The crystal having undergone to both external influences is placed between two crossed polarizers. The spectral course of transmittance of this system near the isotropic point of CdS (the wavelength where the birefringence changes its sign) is studied in the experiment. An explanation of the experimental results is given by using the model of elliptical birefringence in anisotropic gyrotropic crystals. Taking into account the superposition of both external influences, it has been proved that the torsion generates gyrotropy whose parameter changes its sign in the isotropic point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307655
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  • 4
    Electronic Resource
    Electronic Resource
    Torsion induced circular dichroism in hexagonal CdS (1995)
    Springer
    The European physical journal 96 (1995), S. 511-516 
    Details
    ISSN: 1434-6036
    Keywords: 78.20.Dj ; 78.20.Wc ; 78.20.Ek
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of the torsion on the absorption properties of hexagonal CdS has been studied in our experiments. The undeformed CdS does not possess circular dichroism (CD) but it manifests linear dichroism (LD). An appearance of CD and a change of LD can be observed in the torsion deformed CdS crystals. The mentioned absorption phenomena occur in the vicinity of the isotropic point (i.p.), the crossing point of the curves of the refractive indicesn 0(λ) andn e (λ). The sign of CD is connected with the direction of the torsional momentM. The magnitude ofM influences the shape of CD spectra as well as the values of LD. The appearance of CD and the change of LD are explained by the torsion induced gyrotropy in the CdS crystals, i.e. by the created chirality in the hexagonal CdS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313849
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