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  • 1980-1984  (4)
  • 1960-1964
  • 1981  (4)
  • 1
    Electronic Resource
    Electronic Resource
    CRYSTALLOGRAPHIC FATIGUE CRACK GROWTH IN NIMONIC AP1 (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 4 (1981), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Recently a controversy has developed over whether crystallographic crack growth near threshold in Ni-base superalloys occurs along {111} slip planes or {100} planes at room temperature. In this work on Nimonic API crack propagation is shown to occur on both {100} and {111} planes. The most common facet plane is {111} and this is the only orientation observed at the lowest stress intensities, but at higher stress intensities occasional {100} facets are also produced. This behaviour is compared with similar results in aluminium alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1981.tb01128.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The small-angle neutron scattering spectrometer at the University of Missouri research reactor (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 370-382 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A small-angle neutron scattering (SANS) spectrometer has been constructed at the University of Missouri Research Reactor Facility (MURR). The design of the MURR–SANS is unusual in that the size of the reactor containment building constrains the flight path to be vertical. This is achieved by Bragg scattering upward through 90° from a set of slightly misaligned pyrolytic graphite crystals to provide a neutron beam at 4.75 Å with a wavelength spread of approximately 4.1%. The beam incident on the sample is defined by two matched variable apertures located either 3.0 or 4.5 m apart. The evacuated scattered flight path is designed with removable extensions to match the primary flight path in length. The instrument has an automatic sample handling capability provided by its own dedicated PDP 11/03 computer. The detector is a large assembly of commercially available linear 3He detectors as an economic alternative to a crossed-wire two-dimensional multi-detector. An array of 43 position-sensitive proportional counters, 24 in (609.6 mm) long and 0.5 in (12.7 mm) in diameter, using charge division gives a spatial resolution of 5 x 12.7 mm. The area-averaged detector efficiency is about 84% at a wavelength of 4.75 Å. The range of scattering vectors that can be measured is 0.005 〈 Q〈 0.15 Å−1. The instrument is well suited to a wide variety of experiments on specimens having characteristic dimensions between 20 and 500 Å. MURR–SANS is designed as a user-oriented facility which provides both reasonable resolution and intensity on sample at a modest cost, and forms part of a neutron scattering center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009631
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Scanning electron-stimulated desorption microscopy of model-biological surfaces (1981)
    [s.l.] : Nature Publishing Group
    Nature 291 (1981), S. 401-404 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The micrographs were made using a scanning Auger micro-probe10. A scanning electron gun, consisting of a LaB6 source, electrostatic lenses and deflection plates, is concentrically mounted within a cylindrical mirror electron energy analyser. The electron gun can project a bean with a diameter of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/291401a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The distribution of invertebrate communities in a small South African river (1981)
    Springer
    Hydrobiologia 83 (1981), S. 43-65 
    Details
    ISSN: 1573-5117
    Keywords: river ; aquatic macroinvertebrates ; lotic environment ; seasonal changes ; longitudinal zonation ; cluster analysis ; multiple discriminant analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Monthly samples of macroinvertebrates were collected from the stony-bed and marginal-vegetation habitats of a small river in the south western Cape Province, South Africa. Cluster analyses of the samples revealed assemblages of invertebrates (here referred to as ‘communities’) with clear spatial and temporal distribution patterns in the muer. The species composition of the communities, and their distribution, are described. The relation of the macroinvertebrate distribution to changes in the physico-chemical environment was investigated using stepwise multiple discriminant analysis. The results indicated a strong correlation between the two.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187150
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    Paper (German National Licenses)
    Fulltext
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