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  • 1
    Electronic Resource
    Electronic Resource
    High-Resolution Mapping of Two-Dimensional Lattice Distortions in Ion-Implanted Crystals from X-ray Diffractometry Data (1995)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 28 (1995), S. 803-811 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The triple-crystal synchrotron X-ray diffractometry data described by Nikulin, Stevenson, Hashizume, Wilkins, Cookson, Foran & Garrett [J. Appl. Cryst. (1995), 28, 57–60] has been analyzed to map out two-dimensional (two-dimensional) lattice distortions in silicon (111) crystals implanted with B+ ions of 100 keV energy through a periodic SiO2 strip pattern. The lateral periodic structure produced a series of satellite reflections associated with the 111 Bragg peak. The 2D reconstruction incorporates the use of the Petrashen–Chukhovskii method, which retrieves the phases of the Bragg waves for these satellite reflections, together with that for the fundamental. The finite Fourier series is then synthesized with the relative phases determined. Localized distortions perpendicular to the surface arising from deposited B+ ions in near-surface layers of the crystal are clearly displayed with spatial resolutions of 0.016 and 0.265 μm in the depth and lateral directions, respectively. For a sample with the oxide layer removed from the surface, two equally plausible strain maps have been obtained by assigning relative phases to 11 satellites using a sequential trial method and a minimum-energy method. Failed map reconstructions for the oxide-covered sample are discussed in terms of the non-unique solutions of the Petrashen–Chukhovskii phase-recovery algorithm and the ambiguous phases determined for the satellites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889895008788
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  • 2
    Electronic Resource
    Electronic Resource
    Phase-contrast imaging of weakly absorbing materials using hard X-rays (1995)
    [s.l.] : Nature Publishing Group
    Nature 373 (1995), S. 595-598 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Phase-contrast imaging at optical wavelengths is an important technique for studying thin biological samples in vivo and without staining. Such imaging is achieved by interfering a reference wave with waves transmitted through the sample5'6. The phase gradients in the transmitted beam, arising from ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/373595a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phase-contrast imaging using polychromatic hard X-rays (1996)
    [s.l.] : Nature Publishing Group
    Nature 384 (1996), S. 335-338 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FIG. 1 a-c, Schematic illustration of the formation of edge-contrast for a circular cross-section object, f£, being irradiated by a parallel X-ray beam, b, The phase difference, 0, after passing through the object; c, the phase gradient in the x-direction, d/dx, and the second derivative, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/384335a0
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  • 4
    Electronic Resource
    Electronic Resource
    A method for measuring vessel-free density distribution in hardwoods (1999)
    Springer
    Wood science and technology 33 (1999), S. 31-42 
    Details
    ISSN: 0043-7719
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new method for rapid measurement of vessel-free density distribution in hardwood samples cut from increment cores is proposed. The method represents a specialised form of computer tomography which combines the data of X-ray microdensitometry with the information obtained from optical images of the transverse surface of the sample. The tests of the method using a Eucalyptus nitens sample show significant improvement in the accuracy of density determination compared with conventional X-ray densitometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002260050096
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