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  • 1980-1984  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The sampling theorem and small-angle scattering (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 16 (1983), S. 581-589 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: All information about the scattering sample obtainable from small-angle scattering data is shown to be contained in the discrete measured points of a scattering curve distorted by arbitrary collimation conditions, provided that the interval Δh between adjacent measured points fulfils the condition Δh ≤ π/L, where L is the largest correlation distance in the sample; h = 4πλ−1sinθ; λ is the scattered wavelength; and 2θ is the scattering angle. A simple technique has been developed for separation of part of the noise. It is shown that if the total time for measuring a scattering curve is held constant, a scattering curve recorded with Δh equal to the sampling-point interval π/L gives results like those obtained for a scattering curve recorded with a measured point distance smaller than that sampling-point interval. Therefore, Δh should be chosen to be small enough to guarantee that Δh ≤ π/L. Furthermore, a technique has been developed to calculate missing data points from the measured intensities. The condition Δh ≤ π/L has been found to be important for this calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889883011139
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of the correlation function directly from slit-smeared small-angle X-ray scattering curves (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 143-147 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A simple technique has been developed for calculating the correlation function directly from small-angle X-ray scattering curves obtained with an `infinitely long' primary beam profile. The method is based on expanding the correlation function in a series of zero-order Bessel functions of the first kind, where the coefficients of the series are proportional to the intensities of the measured curve. The correlation function thus is represented by an analytical expression and can be calculated easily.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882011686
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of HgH as candidate for a laser (1980)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 31 (1980), S. 193-203 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Die Bildung und Anregung von Quecksilberhydrid in einem entladungsangeregten Hg−H2−He-Gemisch wird untersucht, wobei HgH als Zwei-Niveau-System betrachtet wird. Die rechnerische Simulation der Entladung zeigt, dass Laserwirkungsgrade bis zu 5% möglich sein sollten. Messungen der spontanen Emission von HgH in UV-vorionisierten Entladungen ergeben Werte, die mit den theoretischen gut übereinstimmen.
    Notes: Abstract A description is given of HgH as a two-level laser system involving rate equations for the kinetic processes in discharges of Hg, H2 and He. Discharge simulations show that laser efficiencies up to 5% should be possible. Good agreement between theory and experiment was found for the spontaneous HgH* emission in UV preionized discharges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590747
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1983)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 34 (1983), S. 563-566 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944718
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    Paper (German National Licenses)
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