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  • American Physical Society (APS)
  • International Union of Crystallography (IUCr)
  • 1995-1999
  • 1985-1989  (1.405)
  • 1988  (1.405)
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Verlag/Herausgeber
Erscheinungszeitraum
  • 1995-1999
  • 1985-1989  (1.405)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    A fixture for X-ray crystallographic studies of biomolecules under high gas pressure (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 4-10 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A fixture is described for collecting X-ray diffraction data from biomolecule crystals under gas pressures up to 300 atm (30 MPa). The fixture is completely portable and can be used on conventional diffractometers. Normal procedures for crystal mounting, alignment and data collection require only slight modification. A test data set of the protein sperm whale metmyoglobin under a gas pressure of 145 atm of N2 gas has been collected to a nominal resolution of 2.0 Å using Cu Kα radiation and refined to an R-factor of 16.2%. Data collection beyond 2.0 Å resolution is hampered by the presence of strong powder diffraction from the beryllium shroud.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887008173
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  • 2
    Digitale Medien
    Digitale Medien
    X-ray absorption spectroscopy in the dispersive mode with synchrotron radiation: optical considerations (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 15-22 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Aspects of the optics of the energy-dispersive scheme for X-ray absorption spectroscopy are discussed. The idea of a set of monochromatic focus points related to a set of local Rowland circles is introduced to account for the source-size effect on the energy resolution. It is shown that there exists an optimized location of the position-sensitive detector where the energy resolution is no longer source-size dependent. In addition, the stability of the dispersive optical system has been estimated and a 10 meV energy-scale reliability is currently achieved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887008239
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  • 3
    Digitale Medien
    Digitale Medien
    The effect of sample position on the determination of triaxial stress by X-ray diffraction (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 38-41 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The determination of the full three-dimensional stress tensor in a specimen by X-ray diffraction requires that the strain be measured with the sample tilted in both a positive and a negative sense for different rotations of the sample in its own plane. The error introduced in the measured strain as a function of the position of the specimen relative to the X-ray diffractometer axis is investigated and it is shown that the negative tilt values are more sensitive to sample position than the positive tilt values. The determination of the shear stress components uses the difference between the measured strain at equivalent positive and negative tilts and hence it is shown that displacement of the sample could lead to incorrect deductions concerning the presence and magnitude of the shear stress components.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887008860
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  • 4
    Digitale Medien
    Digitale Medien
    The tensor of compositional deformation. A new crystallographic way to analyse syncrystallization (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 10-15 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Syncrystallization can be analysed through a new approach: the determination of the `tensor of compositional deformation'. It is a convenient way to take structural anisotropy into account and to point out the directions of strongest and weakest modifications of the intermolecular interactions due to the substitution process. The example of 2-chloronaphthalene-2-methylnaphthalene alloys is given in order to illustrate the interest of this new tool.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887008185
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  • 5
    Digitale Medien
    Digitale Medien
    A position-sensitive detector for neutron diffraction topography (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 28-33 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The first test of a position-sensitive photomultiplier in a thermal neutron diffraction topography experiment is reported: a spatial resolution was obtained of ∼200 μm in FWHM over a sensitive area of size ∼8 × 8 mm (∼1600 pixels) and a detection efficiency of the order of 15% when using a 0.25 mm thick ZnS–LiF (NE 426) scintillator. The advantages of this detector, its foreseeable improvements, and the scientific problems it could help to solve are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887008343
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  • 6
    Digitale Medien
    Digitale Medien
    Publish your Crystallographic Computer Programs (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 76-76 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889888099777
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  • 7
    Digitale Medien
    Digitale Medien
    Laboratory EXAFS in a dispersive mode (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 79-85 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A laboratory dispersive mode spectrometer, capable of operating in either the analysing crystal transmission mode or a reflection mode, is described. Extended X-ray absorption fine structure (EXAFS) spectra of Re and ReO2, obtained in the transmission mode, compare favourably with those from a scanning spectrometer at a synchrotron source. Factors affecting resolution, intensity and background in this transmission mode are discussed. Experiments with asymmetric reflection geometries, which have shown both improved resolution for X-ray absorption near edge structure (XANES) and reduced collection times, are reported. Methods of reducing backgrounds due to multiple Bragg reflections and Compton scattering are proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887008641
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  • 8
    Digitale Medien
    Digitale Medien
    Interpretation of the pair function for laminar amorphous materials in the case of coals. II. Structure of coals (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 102-105 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: From studies on six petrographic components of Polish coals by the radial distribution function method and the interatomic distances calculated from them the proportions of atoms with sp2 and sp3 hybridization and the extent of units with sp3-type structure were determined. From these data and the results of the pair-function analysis performed in paper I [Grigoriew (1988). J. Appl. Cryst. 21, 97–101], the model interpretation of the structure of these materials was carried out by matching experimental and model pair functions P(r). The model was defined as an average structural unit which scatters X-rays coherently. It appears that such units in these materials are larger than previously expected and for vitrinites and fuzinites they are in the form of turbostratic layers. The process of formation of stacks of layers was observed in components with the lowest degree of ordering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887009907
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  • 9
    Digitale Medien
    Digitale Medien
    Analysis of single- and double-crystal spectrometers using three-dimensional DuMond diagrams and the high-precision measurement of the Cu Kα1 line profile (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 218-223 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The general principles of single- and double-crystal spectrometers are described using the three-dimensional DuMond diagram and new formulae for the resolution of the spectrometers are deduced. A method for measuring the fine structure of spectral lines with high precision is suggested and a generalized method of refraction correction is discussed. The Cu Kα line profile is measured carefully by double-crystal spectrometers using (nS, nS) and (nV, nR) arrangements, and a hump is found unambiguously on the long-wavelength side of the Cu Kα1 line.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887011841
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  • 10
    Digitale Medien
    Digitale Medien
    Statistical treatment of measured orientation relationships in orientation space (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 311-316 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Measured orientation relationships between neighbouring grains in single-phase α- and β- and dual-phase α + β-brasses are analysed by means of the χ2-test. The orientation relationships are characterized by the three Euler angles and hence can be represented as points in orientation space. A description of the symmetry relations of equivalent points in this space is given and then the distribution function for random orientation relationships is derived. This distribution is compared with the distribution of the measured orientation relationships using only a single χ2-test for each boundary type. The results of the tests are the same as obtained from the analysis of axis-angle pairs, in which case twoχ2-tests are necessary. None of the measured distributions is random.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889888002316
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