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  • 1
    Electronic Resource
    Electronic Resource
    Crystallinity of pure silica glass studied by positron annihilation (1978)
    Springer
    Applied physics 16 (1978), S. 231-233 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.10 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The crystallinity of silica glass fused from Brasilian quartz is demonstrated by positron annihilation lineshape measurements using a high resolution Ge(Li)-detector as well as by positron lifetime measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885117
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Heat treatment of pure silica glass studied by positron annihilation (1978)
    Springer
    Applied physics 16 (1978), S. 119-120 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.10 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The crystallinity of silica glass fused from Brazilian quartz was studied by Doppler-broadening techniques after heat treatment in the temperature range between 1000°C and 1500°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00931432
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Positron lifetimes in V3Si (1978)
    Springer
    Applied physics 17 (1978), S. 421-422 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract From positron annihilation lifetime measurements on V3Si single crystals we estimated that about 17.2% of the positrons annihilate with core electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886216
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stability regions in predator-prey systems with constant-rate prey harvesting (1979)
    Springer
    Journal of mathematical biology 8 (1979), S. 55-71 
    Details
    ISSN: 1432-1416
    Keywords: Predator-prey systems ; Stability ; Catastrophes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Summary We analyze the global behavior of a predator-prey system, modelled by a pair of non-linear ordinary differential equations, under constant-rate prey harvesting. By methods analogous to those used to study predator harvesting, we characterize the theoretically possible structures and transitions. With the aid of a computer simulation we construct examples to show which of these transitions can be realized in a biologically plausible model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280586
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Constant-rate stocking of predator-prey systems (1981)
    Springer
    Journal of mathematical biology 11 (1981), S. 1-14 
    Details
    ISSN: 1432-1416
    Keywords: Ecological modelling ; Predator-prey systems ; Ordinary non-linear differential equations ; Stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We examine the qualitative effects of constant-rate stocking of either or both species in a predator-prey system. The hypotheses are made as mild as possible so that several types of systems with different qualitative alternatives may be studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275820
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Coexistence properties of some predator-prey systems under constant rate harvesting and stocking (1982)
    Springer
    Journal of mathematical biology 12 (1982), S. 101-114 
    Details
    ISSN: 1432-1416
    Keywords: Predator-prey systems ; Harvesting ; Stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The global behaviour of a class of predator-prey systems, modelled by a pair of non-linear ordinary differential equations, under constant rate harvesting and/or stocking of both species, is presented. Theoretically possible structures and transitions are developed and validated by computer simulations. The results are presented as transition loci in the F-G (prey harvest rate-predator harvest rate) plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275206
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    Paper (German National Licenses)
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