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  • 11J13  (1)
  • 2000 Mathematics Subject Classification: 11J61  (1)
  • Adaptive optics, mirrors  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 131 (2000), S. 15-28 
    ISSN: 1436-5081
    Keywords: 2000 Mathematics Subject Classification: 11J61 ; 11J13 ; Key words: Simultaneous approximation ; non-archimedean absolute values
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract.  Let be the approximation exponent of a power series α (so that when α is algebraic of degree d, then by Dirichlet’s and Liouville’s Theorems). If the characteristic is positive, q is a power of the characteristic, and are related by a fractional linear transformation with polynomial coefficients, then by respective work of Voloch and of de Mathan, there are constants such that has no solution if , and infinitely many solutions if . We will formulate and prove generalizations to simultaneous approximation.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 239 (1996), S. 213-219 
    ISSN: 1572-946X
    Keywords: Adaptive optics, mirrors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A piezo driven tilt mirror was developed and built as one component of an image motion compensation system for a solar telescope. The bandwidth of the mirror with a diameter of 60 mm is about 1 kHz with negligible phase shift between input signal and mirror response up to 900 Hz. The tilt range is 1.6 mrad. Special care was taken to maintain the surface quality of the mirror to better than λ/15 after fixing it to the substrate.
    Type of Medium: Electronic Resource
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