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  • dispersion  (1)
  • image reconstruction  (1)
  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Development of a Speckle Interferometer and the Measurement of Fried's Parameter (ro) at the Telescope Site (1999)
    Springer
    Experimental astronomy 9 (1999), S. 39-49 
    Details
    ISSN: 1572-9508
    Keywords: image reconstruction ; interferometer ; seeing ; speckle imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new optical speckle interferometer for use at the 2.34 meter Vainu Bappu Telescope (VBT), at Vainu Bappu Observatory (VBO), Kavalur, India, has been designed and developed. Provisions have been made for observation both at the prime focus (f/3,25), as well as at the Cassegrain focus (f/13) of the said telescope. The technical details of this sensitive instrument and the design features are described. An interface between the telescope and the afore-mentioned interferometer is made based on a concept of eliminating the formation of eddies due to the hot air entrapment. The performances of this instrument has been tested both at the laboratory, as well as at the Cassegrain end of the telescope. It is being used routinely to observe the speckle-grams of close-binary (separation 〈 1 arc second) stars. The size of the Fried's parameter, ro, is also measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008057218328
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    REFLECTION AND TRANSMISSION OF SHEAR WAVES IN MONOCLINIC MEDIA (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 21 (1997), S. 495-504 
    Details
    ISSN: 0363-9061
    Keywords: monoclinic ; shear waves ; reflection ; transmission ; dispersion ; amplitude ratio ; Engineering ; Civil and Mechanical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: This paper deals with the propagation, reflection and transmission of shear waves in monoclinic media. The dispersion equation for a monoclinic layer overlying a monoclinic half-space has been obtained and curves are plotted. The amplitude ratios for both the reflected and transmitted waves due to reflection of shear waves at the interface of two monoclinic half-spaces have also been computed and the numerical results are presented graphically. The results are compared with the isotropic case. It has been observed that, in monoclinic media, the amplitude ratios for reflected and transmitted wave increases approximately by 25 and 50 per cent respectively, in comparison to the isotropic case. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
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