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  • American Physical Society (APS)
  • International Union of Crystallography (IUCr)
  • 1985-1989  (6.250)
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  • 1
    Digitale Medien
    Digitale Medien
    Checklist for Authors of Papers Submitted to Journal of Applied Crystallography (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 1-2 
    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/S0021889885011013
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Two new X-ray films: conditions for optimum development and calibration of response (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 3-7 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The response of Kodak DEF and CEA Reflex 25 direct-exposure X-ray films to Cu Kα X-rays is reported for optical densities between 0 and 3.0. A simple general procedure for exposing films, calibrating the microdensitometer and analyzing response is presented. Conditions have been determined for obtaining uniform development with maximum signal/film-background ratio. From the experimentally determined dose-response curves, useful data can be extracted from higher optical density (OD) readings than are traditionally used and/or the accuracy of the data can be increased.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889885009670
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  • 3
    Digitale Medien
    Digitale Medien
    Differential X-ray diffraction: a theoretical basis for a technique based on wavelength variation (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 8-15 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Differential diffraction is an extension of spectrum-subtraction techniques of spectroscopy to X-ray powder diffraction. In differential diffraction two patterns are taken for the same material under different conditions. The patterns are then subtracted to obtain information helpful in characterizing the material. Examples of exploitable effects are density, magnetism, particle size, preferred orientation and absorption. One application of differential diffraction is the identification of phases in mixtures. If differential diffraction techniques could be used to label each diffraction line in a pattern with the elements of the compound giving rise to that particular line, phase characterization of mixtures would be greatly simplified. One possible way to accomplish this labeling is to take advantage of the pronounced change in absorption that occurs near the absorption edge of an element. A theory is presented for a differential diffraction technique based on wavelength variation that will allow diffraction peaks to be labeled with elemental information. Patterns are calculated for a binary mixture of CuO and NiO using wavelengths chosen to straddle an absorption edge for Ni. The absorption effects make it easy to use the difference pattern to separate and identify the two phases present. Extension of this method to more complex multiphase mixtures would necessitate additional patterns and require solution through factor analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889885009682
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  • 4
    Digitale Medien
    Digitale Medien
    Focusing monochromators for pulsed neutron sources (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 16-19 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A method of monochromating a pulsed neutron beam, whilst achieving focusing in space and time, is proposed using an array of crystal monochromators arranged along the incident beam. The method has been verified experimentally using copper monochromators on the Harwell electron linac pulsed neutron source. Its application to high intensity pulsed neutron inelastic spectrometers is indicated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889885009694
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  • 5
    Digitale Medien
    Digitale Medien
    Single-crystal diffractometry: strategy for rapidly decaying poorly diffracting crystals (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 20-26 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A strategy allowing rapid data collection has been developed on a standard Philips PW1100 automatic four-circle diffractometer adapted for protein studies. Hardware modifications include: a long arm enabling a continuous adjustment of the crystal-to-counter distance, a helium pathway with variable apertures on the detector side, and a cooling system for temperatures down to 263 K using an axial flow of dry air blown onto the crystal along the axis. Modifications of the diffractometer software, providing a more efficient data collection strategy, are also described. An integrated set of Fortran programs has been implemented on a 16-bit minicomputer for the processing of the experimental measurements. During the treatment of the Bragg reflections, stored with their profiles, special care is taken for background estimation and decay correction. The set of programs and the strategy have been successfully tested with the structure determinations to high resolution of yeast tRNAsp and of cardiotoxin IV from Naja mossambica mossambica. The modified hardware has also been successfully used for data collection of a large number of poorly diffracting small-molecule crystals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889885009700
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  • 6
    Digitale Medien
    Digitale Medien
    Angle and index calculations for `z-axis' X-ray diffractometer (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 33-36 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Closed formulas are given for the calculation of the orientation matrix and the angles for a given reflection in a `z-axis' diffractometer geometry. These equations are derived for the conditions where the angle of incidence of the primary beam to the surface of the crystal is specified. Comparison is made with the standard four-circle configuration and the differences between these two geometries are evaluated. Some further applications are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889885009724
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  • 7
    Digitale Medien
    Digitale Medien
    A treatment of instrumental smearing effects in circularly symmetric small-angle scattering (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 42-46 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Instrumental smearing effects can result in a significant deviation of measured small-angle scattering data from the ideal cross section. The effect of various contributions to smearing is described. The case of circularly symmetric scattering measured on an instrument collimated by circular apertures is treated in detail. For such measurements, it is shown how known scattering functions can be smeared to allow estimation of parameters by a fit to the observed data, and also how the indirect Fourier transformation method can be used to desmear the observed scattered intensity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889885009748
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  • 8
    Digitale Medien
    Digitale Medien
    On the structure of the M' phase in Al–Zn–Mg alloys (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 47-48 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Recently published work on the metastable phase M′, while agreeing with most of the earlier findings regarding its nature and morphology, raised doubts regarding the previously proposed structure. The basis of these doubts is discussed; reasons, based mainly on the experimental conditions employed, and evidence are given as to why the objections are not valid.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988500975X
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  • 9
    Digitale Medien
    Digitale Medien
    Structure of crystalline polymers edited by I. H. Hall (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 53-54 
    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/S0021889885009797
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  • 10
    Digitale Medien
    Digitale Medien
    Dry etching for microelectronics edited by R. A. Powell (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 54-54 
    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/S0021889885009815
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