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  • Cauchy singular and Hadamard finite part integrals  (1)
  • Instrumentation and Photography  (1)
  • 1
    ISSN: 1436-5057
    Keywords: Primary 65D30 ; 41A55 ; Secondary 65-04 ; 58G15 ; Numerical cubature ; weakly singular ; Cauchy singular and Hadamard finite part integrals ; symbolic manipulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Wir untersuchen die numerische Auswertung aller singulärer Oberflächenintegrale, die beim 3-dimensionalen Rand element-Verfahren entstehen, theoretisch und numerisch. Die Verwendung von dreiecksbezogenen oder lokalen Polarkoordinaten nach Duffy zusammen mit Gaußscher Tensorproduktquadratur erweist sich als effizient und zu verläßich sowohl für die h-als auch die p-Randelemente, wenn schwach singuläre Integrale vorliegen. Oberflächenintegrale mit Cauchyschen oder starken Singularitäten führen wir mit Hilfe von Symbolmanipulation auf solche mit schwachen Singularitäten zurück.
    Notes: Abstract The numerical integration of all singular surface integrals arising in 3-d boundary element methods is analyzed theoretically and computationally. For all weakly singular integrals arising in BEM, Duffy's triangular or local polar coordinates in conjunction with tensor product Gaussian quadrature are efficient and reliable for bothh-andp-boundary elements. Cauchy- and hypersingular surface integrals are reduced to weakly singular ones by analytic regularization which is done automatically by symbolic manipulation.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-13
    Description: We have developed an optical design for a high resolution spectrograph in response to NASA's call for an extreme precision Doppler spectrometer (EPDS) for the WIYN telescope. Our instrument covers a wavelength range of 380 to 930 nm using a single detector and with a resolution of 100,000. To deliver the most stable spectrum, we avoid the use of an image slicer, in favor of a large (195 mm diameter) beam footprint on a 1x2 mosaic R4 Echelle grating. The optical design is based on a classic white pupil layout, with a single parabolic mirror that is used as the main and transfer collimator. Cross dispersion is provided by a single large PBM2Y glass prism. The refractive camera consists of only four rotationally symmetric lenses made from i-Line glasses, yet delivers very high image quality over the full spectral bandpass. We present the optical design of the main spectrograph bench and discuss the design trade-offs and expected performance.
    Keywords: Instrumentation and Photography
    Type: GSFC-E-DAA-TN53101 , SPIE Astronomical Telescopes + Instrumentation 2016; Jun 26, 2016 - Jul 01, 2016; Edinburgh, Scotland; United Kingdom
    Format: application/pdf
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