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  • 1980-1984  (2)
  • 1982  (2)
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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 17 (1982), S. 1729-1738 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The conditions required to grow high quality lithium tetraborate single crystals are described, along with the defects likely to be encountered during growth of the crystals. The relationship of the latter to the growth mechanism is discussed and a mechanism proposed which provides an explanation of the observed nature of the defects and of the manner in which the crystals grow and reject impurities.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: Advanced methods involving observations of extraterrestrial objects, such as artificial satellites or quasars, may make it possible to monitor geometrical variations in survey networks of regional, continental, and global scale with a spatial resolution of a few centimeters and a temporal resolution of better than one day. However, in connection with a realization of this potential, it is necessary to account for variations in the orientation of the earth in space. The accuracy provided by the conventional approaches for determining the orientation of the earth is not sufficient in this case. However, an appropriate method could be based on the utilization of independent clock radio interferometry (commonly referred to as VLBI) observations of extragalactic radio sources. The project POLARIS (Polar-motion Analysis by Radio Interferometric Sampling) is concerned with an implementation of this method. The MERIT (Monitor Earth Rotation and Intercompare the Techniques of observation and analysis) observations represent an aid to project POLARIS. Attention is given to details regarding these programs and the results obtained thus far.
    Keywords: GEOPHYSICS
    Type: High-precision earth rotation and earth-moon dynamics: Lunar distances and related observations; May 22-27, 1981; Alpes-Maritimes; France
    Format: text
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