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  • 1990-1994  (9)
  • 1985-1989  (8)
  • 1965-1969  (11)
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  • 1
    Digitale Medien
    Digitale Medien
    FLUCTUATIONS IN THE CHEMICAL COMPOSITION OF TWO LAKEWEEDS FROM NEW ZEALAND (1966)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 6 (1966), S. 0 
    Details
    ISSN: 1365-3180
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary. The mineral content of Elodea canadensis and Lagarosiphon major growing in two lakes near Rotorua showed seasonal variation and was influenced by the nutrient status of the water. Large quantities of L. major occur in Lake Rotorua and the average mineral content found was 3·9% N, 0·5% P, 2·6% K and 0·7% Mg (dry-weight basis), a level which indicates potential commercial value.Variations de la composition chimique de deux mauvaises herbes aquatiques des lacs de Nouvelle-Zélande
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3180.1966.tb00901.x
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  • 2
    Digitale Medien
    Digitale Medien
    Refinement of simple crystal structures from synchrotron radiation powder diffraction data (1987)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 20 (1987), S. 394-401 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: X-ray powder diffractometry with storage-ring radiation was used to test various aspects of a method for refining simple crystal structures (Si, CeO2 and Co3O4). Excellent powder patterns were obtained with 0.17° resolution parallel slits and 1 Å X-rays. The intensities were determined with a double-Gaussian profile-fitting function and used in the powder least-squares refinement program POWLS. Except for Si, the peaks were broadened because of small particle sizes. The R(Bragg) values were in the range 0.4–1.7%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887086412
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  • 3
    Digitale Medien
    Digitale Medien
    Crystal structures of quartz and magnesium germanate by profile analysis of synchrotron-radiation high-resolution powder data (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 182-191 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: High-resolution synchrotron-radiation powder data for quartz and Mg2GeO4, an olivine homologue, were obtained with a 365 mm long parallel-slit collimator with 0.05° aperture. The crystal structures were refined using a pseudo-Voigt profile fitting function and POWLS. Fourier maps were calculated from the measured structure factors of the germanate. The results for quartz were in good agreement with single-crystal data and R(Bragg) increased from 1.35 to 2.20% as the number of reflections included in the refinement increased from 46 to 119; the e.s.d.'s of the positional parameters were 4 to 8 × 10−4. The germanate gave R(Bragg) 4.85% using 77 Miller planes and the e.s.d.'s were 4 to 42 × 10−4. Special attention was given to the profile fitting function and the non-random particle distributions. The JCPDS Diffraction File Nos. will be reported in a later communication.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889887011567
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  • 4
    Digitale Medien
    Digitale Medien
    Profile fitting and the two-stage method in neutron powder diffractometry for structure and texture analysis (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 228-239 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: An outline and an application of the two-stage method in neutron powder diffractometry are presented. Stage (1): Individual reflection data like position, half-width and integrated intensity are analysed by profile fitting. The profile analysis is based on an experimentally determined instrument function and can be applied without prior knowledge of a structural model. A mathematical procedure is described which results in a variance–covariance matrix containing standard deviations and correlations of the refined reflection parameters. Stage (2): The individual reflection data derived from the profile fitting procedure can be used for appropriate purposes either in structure determination or in texture and strain or stress analysis. The integrated intensities are used in the non-diagonal weighted least-squares routine POWLS for structure refinement. The weight matrix is given by the inverted variance-covariance matrix of stage (1). This procedure is the basis for reliable and real Bragg R values and for a realistic estimation of standard deviations of structural parameters. In the case of texture analysis the integrated intensities are compiled into pole figures representing the intensity distribution for all sample orientations of individual hkl. Various examples for the wide application of the two-stage method in structure and texture analysis are given: structure refinement of a standard quartz specimen, magnetic ordering in the system TbxY1−xAg, preferred orientation effects in deformed marble and texture investigations of a triclinic plagioclase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889888001013
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  • 5
    Digitale Medien
    Digitale Medien
    Crystal structure analysis of AlB10 by the convolution molecule method (1967)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 23 (1967), S. 1071-1079 
    Details
    ISSN: 0001-5520
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0365110X6700427X
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  • 6
    Digitale Medien
    Digitale Medien
    Die Kristallstruktur von C4AlB24 (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 1219-1222 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740869003840
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  • 7
    Digitale Medien
    Digitale Medien
    PROFAN-PC: a PC program for powder peak profile analysis (1990)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 23 (1990), S. 444-445 
    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/S0021889890004666
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  • 8
    Digitale Medien
    Digitale Medien
    The use of Image Plates for Laue diffraction with synchrotron radiation with olivine single-crystal studies as an example (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 27 (1994), S. 190-192 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: In Laue experiments at the SRS Daresbury, Image Plates were used to determine the crystal structure of an olivine single-crystal, (Mg90Fe10)2SiO4. The exposure time was 50 ms. For the complete data set, five different φ settings were recorded within 20 min. This is the first time that Image Plates have been successfully used for crystal structure analysis of minerals or small crystals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889893008684
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  • 9
    Digitale Medien
    Digitale Medien
    R values in analysis of powder diffraction data using Rietveld refinement (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 27 (1994), S. 492-496 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Profile and Bragg R values are discussed with respect to different versions of the Rietveld program. The R values calculated from an exemplary neutron diffraction pattern are compared. Results obtained by a modified treatment of background and by a simplified method to decompose an observed pattern into Bragg intensities are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889893012348
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  • 10
    Digitale Medien
    Digitale Medien
    Angle-dispersive time-of-flight diffraction in a pulsed beam: an efficient technology to exploit the thermal-neutron spectrum – design of a JULIOS diffractometer and experimental tests (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 26 (1993), S. 660-669 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The time- and position-resolving scintillation detector JULIOS was used for diffraction experiments in a pulsed neutron beam at the ISIS spallation source at the Rutherford Appleton Laboratory. Angle-dispersive time-of-flight measurements with samples positioned in the primary white beam were performed on standard materials and on zinc-containing spinel oxides; cation distributions of these compounds were determined by least-squares intensity refinements. The experimental setup was used for a comparison of results obtained using white-beam diffractometry at a pulsed spallation source and results obtained using conventional diffractometry with monochromatic neutrons at a continuous reactor beam. A gain by a factor of about 50 in intensity in favour of the white-beam technology was obtained when results were extrapolated for an equal time-averaged mean neutron flux. A JULIOS-type diffractometer was designed to take full advantage of the time structure of the ISIS frame.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889893003267
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