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  • 1
    Digitale Medien
    Digitale Medien
    The Distribution of Protein, Lysine and Methionine, and Antitryptic Activity in the Cotyledons of Some Leguminous Seeds (1967)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 32 (1967), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: —Concentration gradients for protein, lysine and methionine, and antitryptic activity were established in the cotyledons of two representative varieties of oil and grain legumes. Antitryptic activity in the separated cotyledons does not invariably follow the protein-distribution pattern.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1967.tb01972.x
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  • 2
    Digitale Medien
    Digitale Medien
    PREDICTION OF FATIGUE LIFE BY X-RAY DIFFRACTION METHODS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 1 (1979), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: Abstract— X-ray double crystal diffractometry and reflection topography were employed to examine the defect structure induced by fatigue of A1 2024 specimens. Analysis after various amounts of tension compression cycling revealed that the excess dislocation density in the surface layer increased rapidly early in the fatigue life, and maintained virtually a plateau value from 20 to 90% of the life. Beyond 90%, the excess dislocation density increased rapidly again to a critical value at failure. Investigation of the defect distribution in depth showed that the excess dislocation density in the bulk material, by contrast to the surface layer, increased more gradually during the life. Using deeply penetrating molybdenum radiation, the grains in the bulk could be analyzed, and thus the fatigue life and onset of failure could be predicted nondestructively. It was also shown that, after removal of the surface layer, the defect structure induced in the bulk by prior cycling was unstable. The resultant extension of fatigue life by surface layer removal was explained on the basis of this structural instability of the bulk material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1979.tb00393.x
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  • 3
    Digitale Medien
    Digitale Medien
    Strain inhomogeneities in lightly compressed tungsten crystals (1968)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 1 (1968), S. 139-145 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A study of strain inhomogeneities in a zone-refined tungsten crystal oriented for (123) slip was carried out before and after a slight compression. The study was based on changes of interplanar spacings measured along different crystallographic directions and samples from different areas of the crystal by means of the X-ray back-reflection divergent beam method. Upon compression a redistribution of the locked-in elastic strains took place and the induced strains assumed a more homogeneous distribution for one of the sets of (123) planes considered. This homogeneity in the strain distribution along definite crystallographic directions is believed to result from the interaction of the primary slip dislocations with the pre-existing dislocation configuration and appears to be characteristic of the initial stage of work-hardening. The dislocation interaction induced by a small strain found practical application in the elimination of a troublesome substructure in highly zone-refined tungsten crystals and appears to form the scientific basis of certain stress-relief treatments long practised in metallurgical technology.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889868005194
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  • 4
    Digitale Medien
    Digitale Medien
    Synergy of line profile analysis and selected area topography by the X-ray divergent beam method (1969)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 2 (1969), S. 200-209 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A method is presented which combines the analysis of X-ray absorption profiles and selected area X-ray topographs. The method is based on X-ray divergent beam patterns obtained in transmission. The absorption profiles are obtained by unfolding the spectral distribution from the profiles of the deficiency conics, whereas the selected area topographs derive from the corresponding diffraction conics. The synergy of the two techniques makes the method particularly useful for the elucidation of anisotropic effects and inhomogeneities of defect structures. An example is given for the room temperature deformation of beryllium.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889869006984
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  • 5
    Digitale Medien
    Digitale Medien
    Determination of strain distribution in elastically bent materials by X-ray intensity measurement (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 12 (1979), S. 209-220 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A method for quantitative determination of local curvature in elastically bent perfect crystals is described. The method is based on X-ray intensity measurements, and a comparison of experimentally determined values with those derived from diffraction theory gives satisfactory agreement. The method was applied to determine the strain gradient and strain concentration in the vicinity of the notch of an elastically bent crystal. The experimental results were compared with those derived from a similar model based on continuum mechanics. Possible applications of the X-ray method are discussed to obtain experimental solutions to strain analyses which, when approached by continuum mechanics, pose formidable mathematical obstacles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188987901219X
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  • 6
    Digitale Medien
    Digitale Medien
    On the X-ray reflectivity of elastically bent perfect crystals (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 16 (1983), S. 295-303 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The integrated X-ray reflectivity of elastically bent, but otherwise perfect, crystals are calculated for Laue-type reflections covering the entire curvature range. Anomalous transmission and elastic anisotropy are taken into account, and it is shown that both these effects affect appreciably the reflected intensities for both weakly and strongly bent crystals. The validity of the reflectivity-versus-curvature relation thus obtained is experimentally confirmed for a number of reflections from silicon crystals. The implications of the experimental results to brittle fracture are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S002188988301047X
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  • 7
    Digitale Medien
    Digitale Medien
    Determination of notch-tip plasticity by X-ray diffraction and comparison to continuum mechanics analysis (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 594-601 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: Dislocation-free silicon crystals of ({\bar 2 \bar 1 \bar 1}) orientation with a hyperbolic notch, subjected to tensile deformation at 1073 K, were used as model material for the analysis of the induced plastic zone. The results obtained by X-ray topography and X-ray rocking-curve measurements were compared to theoretical calculations and predictions based on continuum mechanics. Good agreement between experiment and theory was obtained regarding the shape of the plastic zone, the contribution of the active slip systems to the size of the plastic zone and the direction of the maximum plastic strain trajectory in the zone. Discrepancies between experiment and theory regarding the symmetry relation of the plastic zone lobes and the dislocation density near the notch tip were attributed to the interactions and resulting work-hardening. These aspects were not taken into account in calculations of continuum mechanics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889882012746
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  • 8
    Digitale Medien
    Digitale Medien
    The fabrication of a dual-element X-ray divergent-beam target (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 352-353 
    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/S0021889881009540
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  • 9
    Digitale Medien
    Digitale Medien
    Quantitative analysis of intensitities in X-ray topographs by enhanced microfluorescence (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 16 (1983), S. 606-610 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A method is presented for enhancing the fluorescence of the silver precipitates in the microfluorescent analysis of X-ray topographs by scanning electron microscopy or similar electron microprobes. The method is based on the indirect excitation of the silver fluorescence by depositing a thin suitable metal film on the emulsion of a nuclear track plate. Theoretical aspects of the method are presented and experimentally verified. The method was applied to determine the elastic strain distribution in a bent silicon plate containing a hole by measuring the opacities of the exposed and developed topograph obtained from the specimen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889883011164
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  • 10
    Digitale Medien
    Digitale Medien
    Determination of strain concentration by microfluorescent densitometry of X-ray topography: A bridge between microfracture and continuum mechanics (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 290-296 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The strain distribution in the vicinity of the notches of a double-notched, elastically bent silicon crystal was determined by measuring the diffracted X-ray intensities. The measurements were carried out on traverse-oscillation topographs of a crystal section extending through both notches. Strain distributions were determined by measuring the local densities of silver deposits (measurements of `opacities') with a scanning electron microscope. It was shown that both the density range and spatial resolution of X-ray densitometry were larger by an order of magnitude than those of optical densitometry. The strain concentration factors associated with the notches were measured experimentally and calculated by continuum mechanics. The results were in satisfactory agreement. Also, the experimentally found rise of strains, to a maximum in the critical area adjacent to the notch root, followed the trend predicted by continuum mechanics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012083
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