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  • PANGAEA  (184,590)
  • Cell Press  (30,023)
  • American Physical Society (APS)
  • International Union of Crystallography (IUCr)
  • 2005-2009  (213,262)
  • 1970-1974  (5,891)
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  • 1
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    Distributions of C and O isotopes of calcite and dolomite from core M40/4_76-6 and from sediments of the Urania Basin (Fig. 3) (2008)
    PANGAEA
    In:  PANGAEA - Data Publisher for Earth Environmental Science
    Details
    Publication Date: 2021-03-27
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 2
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    Geochemistry of sediment core M40/4_76-6 (2007)
    PANGAEA
    Details
    Publication Date: 2021-03-27
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 3
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    Geochemical analysis of sediments from three coring sites in the Mediterranean (2007)
    PANGAEA
    Details
    Publication Date: 2021-03-27
    Description: In a gravity core from the eastern Mediterranean Sea, a chemically and mineralogically distinct, 5.5-cm-thick layer is present above sapropel S-1 and overlain by hemipelagic marls. Calcite is completely absent in this exotic layer, dolomite is present only in small amounts, and the Cr concentrations are significantly enhanced. The layer was deposited primarily under reducing conditions, but the distributions of redox-sensitive elements show that a large part of the exotic layer is now oxidised by a downward-progressing oxidation front. Sediments from within the nearby anoxic, hypersaline Urania Basin are similar to those from the exotic layer, in particular in S-, C-, and O-isotope distributions of pyrite and dolomite, as well as increased Cr concentrations. Mud expulsion due to expansion of gas-rich mud is proposed to explain the presence of the exotic layer outside the Urania Basin. The deposition of an anoxic layer above S-1 shielded the sapropel from oxidation which resulted in the rare occurrence of a complete preservation of S-1 and provides the first minimum age for the start of anoxic mud accumulation in the Urania Basin.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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  • 4
    Electronic Resource
    Electronic Resource
    X-ray determination of polarity sense by anomalous scattering at an absorption edge (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 27-32 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A technique is described for the determination of crystallographic polarity which is generally applicable to large polar crystals containing an element heavier than K. It is an extension and simplification of Cole & Stemple's method in which the intensities diffracted by (00 l) and (00\overline l) planes are compared at wavelengths close to an absorption edge of a constituent element. A definitive polarity determination may now be made without previously measuring or assuming values of Δf′ and Δf′′ at the edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005599
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Centring equipment for X-ray diffractometers and X-ray cameras used with monochromators (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 101-102 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870099983
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  • 6
    Electronic Resource
    Electronic Resource
    X-ray diffraction method for measurement of elastic strain (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 110-112 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A method is suggested, using diffraction line displacements, to facilitate simultaneous determination of one-dimensional strain in a particular direction in the surface of a polycrystalline material and of the lattice parameter corresponding to the unstressed state. A single exposure at perpendicular incidence of the primary X-ray beam enables both values to be obtained. Full advantage is taken of the ratios of diffraction ring diameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005782
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  • 7
    Electronic Resource
    Electronic Resource
    A computer program for X-ray line broadening analysis (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 120-123 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A computer program has been written for the evaluation of the size of coherently diffracting domains, microstrains, and stacking fault probabilities for f.c.c. and h.c.p. single crystals. After correcting for instrumental effects, the Warren–Averbach analysis is applied to reflections which are not affected by stacking faults. The fault-broadened peaks are then analyzed and the results plotted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005800
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison of two methods for calculating slit-length collimation corrections in small angle X-ray scattering (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 137-145 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The methods of Lake [Acta Cryst. (1967) 23, 191] and Schmidt [Acta Cryst. (1965) 19, 938] for calculating slit-length collimation corrections in small angle X-ray scattering have been compared in a number of tests. The tests showed that under most conditions neither method introduces errors larger than the expected uncertainty in present-day scattering data and that slit-length corrections are relatively insensitive to small changes or errors in the weighting function. Neither method is extremely sensitive to random errors in the measured intensity but the effect of these errors is somewhat smaller with Schmidt's method than with Lake's. Three cases were found in which one of the correction methods should be avoided or used with caution: with Schmidt's method errors are produced in the outer part of the scattering curve if the angular increment is too large – a criterion has been developed for determining acceptable increments; if Lake's method is used in an angular region in which a scattering curve has subsidiary maxima or minima, more iterations may be necessary than are required for monotonically decreasing scattering curves; the usual form of Lake's method, which was developed to converge rapidly with curves which have a zero-angle maximum, was sometimes found to give appreciable errors for curves with a pronounced minimum at zero scattering angle. When the latter type of curve is corrected by this method, precautions should be taken to ensure that the collimation correction is not introducing errors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005824
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  • 9
    Electronic Resource
    Electronic Resource
    On refinement of the crystal orientation matrix and lattice constants with diffractometer data. II (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 179-180 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A modification of the refinement procedure proposed by Shoemaker & Bassi [Acta Cryst. (1970). A26, 97] is described in which the correction to the unitary orientation matrix, valid to second order in the small rotational adjustment, is applied after constraints due to crystal symmetry (which is presumably lost owing to measurement errors) have been applied to the lattice constants, and in such a way as to preserve (to second order) the unitary character of that matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005897
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  • 10
    Electronic Resource
    Electronic Resource
    The construction of atomic projections by computer (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 185-187 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Two computer programs, for use with an Elliot 803 machine, are described. These programs enable atomic projections from any crystal system, other than the triclinic, to be constructed in a relatively short time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005939
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