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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 55 (1995), S. 255-269 
    ISSN: 1436-5057
    Keywords: 41A55 ; 65D30 ; Cauchy principal value integrals ; modified compound quadrature formulae ; Peano kernels ; error estimates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Eine der Standardmethoden zur Berechnung Cauchyscher Hauptwerte ist es, zunächst die Singularität herauszuziehen und dann eine gegebene Quadraturformel anzuwenden. Die daraus resultierende Quadraturformel für das Cauchysche Hauptwert-Integral wird als modifizierte Quadraturformel bezeichnet. In dieser Arbeit wird der Fall betrachtet, daß die gegebene Quadraturformel eine zusammengesetzte Quadraturformel ist, und es werden Fehlerabschätzungen der Form |R[f]| ≤κ i ∥f (i) ∥∞ hergeleitet (wobeiR[f] der Fehler der modifizierten Quadraturformel ist). Im Gegensatz zu früheren Abschätzungen wird das Verhalten vonκ i für den Fall, daß die Anzahl der Stützstellen gegen Unendlich geht, exakt bestimmt.
    Notes: Abstract One of the standard methods for computing Cauchy principal value integrals is to subtract the singularity, and then to apply a given quadrature formula. This results in a quadrature formula for the Cauchy principal value integral which is called a modified quadrature formula. Here, we consider the case that this given quadrature formula is a compound quadrature formula, and derive error estimates of the form |R[f]| ≤κ i ∥f (i) ∥∞ (whereR[f] is the error of the modified quadrature formula). In contrast to previous estimates, the behaviour ofκ i when the number of quadrature nodes tends to infinity is determined exactly.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 28 (1986), S. 74-77 
    ISSN: 1432-1920
    Keywords: Head ; MRI ; Image quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied the subjective rating of MR image quality as field strength, slice thickness, number of acquisitions and matrix size were varied. Matrix and number of acquisitions had the most significant effect on image quality. Therefore, in comparisons of image quality, technique must not be disregarded.
    Type of Medium: Electronic Resource
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