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  • 11
    Electronic Resource
    Electronic Resource
    Extension of the de Sitter kink (1994)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 4145-4156 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A space–time, locally identical to the usual de Sitter space–time but globally different because of a kink in its light cone field, is described in various coordinate systems. Two separate coordinate patches are needed. Each original patch is geodesically incomplete and so is extended by the Kruskal method. The space–time, which is not globally hyperbolic, is shown to be foliated by a family of hypersurfaces each of which is homeomorphic to a three-sphere but none of which is everywhere spacelike.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530846
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  • 12
    Electronic Resource
    Electronic Resource
    Kinks and geodesic incompleteness (1996)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 5637-5651 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The problem of geodesic incompleteness is examined for space–times with Finkelstein–Misner kinks. A discussion of spherically symmetric kink space–times is followed by specific examples in which geodesics, initially incomplete in the original space–time, are shown to be extendible by the Kruskal technique. The structure of the two Kruskal patches and their matching at the patch boundaries are worked out in detail for one such example. Comments are made concerning a possible link between extendibility and energy conditions. It is shown that the kinds of spherically symmetric kink space–times examined in the present paper do not satisfy the strong energy condition. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531731
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  • 13
    Electronic Resource
    Electronic Resource
    Kink number in general relativity (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 476-479 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A comparison of general relativity with the theory of skyrmions is used to develop a method for counting the number of Finkelstein–Misner kinks in any given general relativistic metric. Some examples of kink number computations are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529437
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  • 14
    Electronic Resource
    Electronic Resource
    De Sitter kinks (1989)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 30 (1989), S. 87-89 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In this paper a kink solution to the vacuum Einstein equations with cosmological constant Λ〉0 is discussed. The solution is well-defined on the whole space-time manifold. An appropriate coordinate transformation shows the solution to be locally the same as the de Sitter solution. Globally, the two are distinct, since the light-cone field for the kink solution is homotopically nontrivial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528601
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  • 15
    Electronic Resource
    Electronic Resource
    Seaward migrating subyearling chinook salmon avoid overhead cover (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 67 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Approximately three-quarters of migrating autumn (fall) chinook salmon Oncorhynchus tshawytscha smolts avoided a covered channel and selected an uncovered channel when presented with a choice in an experimental flume. Rejection of overhead cover occurred prior to, but was rare post-channel entrance. Smolts may selectively reject riparian cover as an adaptive behavioural response to minimize predation risk and enhance rates of migration. The findings have implications for fish bypass design and riparian habitat and culvert restoration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00833.x
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  • 16
    Electronic Resource
    Electronic Resource
    Corrections needed in double-cantilever beam tests for assessing the interlaminar failure of fibre-composites (1989)
    Springer
    Journal of materials science 8 (1989), S. 125-129 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730701
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  • 17
    Electronic Resource
    Electronic Resource
    Crack sharpness effects in fracture testing of polymers (1985)
    Springer
    Journal of materials science 20 (1985), S. 922-928 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Tests on five polymers are described in which the fracture toughness,K b, was determined in three-point bending using cracks with a range of tip radii. The variation ofK b with tip radius is modelled using a two criterion elastic model, a stress and a length, and using these it is possible to estimate the sharp crack values and the effects of blunting arising from the plastic zone. A suggestion for a possible standard test is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585735
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  • 18
    Electronic Resource
    Electronic Resource
    Material and geometry effects on crack shape in double torsion testing (1985)
    Springer
    Journal of materials science 20 (1985), S. 77-84 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Previous work has established a model for expressing the curved crack front shape observed in a Double Torsion test in a single parameter, the shape factorS. This paper demonstrates the ability of this model to account for crack shape effects on measured toughness against crack speed data, using a direct measurement ofS, in tests on polymethyl methyacrylate (PMMA) of various molecular weights. The analysis is then extended to enableS to be predicted without reference to the material crack front size parameter referred to in earlier work: only specimen geometry significantly influences the crack front shape in a wide variety of materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00555901
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  • 19
    Electronic Resource
    Electronic Resource
    The failure of fibre composites and adhesively bonded fibre composites under high rates of test (1996)
    Springer
    Journal of materials science 31 (1996), S. 4467-4477 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The failure of fibre composites under high rates of test was studied in detail, using a fracture mechanics approach to determine values of the fracture energies. The present paper, Part III of the series, considers the fracture of two different fibre composite materials under mixed-mode tensile and shear (i.e. mixed-mode I/II) and shear (i.e. mode II) loadings. Part I considered the experimental aspects of the mode I fracture of the fibre composite materials, and of adhesive joints. Part II analysed the dynamic effects which are invariably associated with high-rate tests, and showed how these effects influence the observed behaviour of the test specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366342
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  • 20
    Electronic Resource
    Electronic Resource
    Primary structure of human transferrin receptor deduced from the mRNA sequence (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 675-678 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The clone pTR48 contains a 2-kilobase (kb) cDNA insert derived from the human transferrin mRNA8. Using this clone as a probe, a set of five overlapping cDNA clones was isolated containing, in total, 5 kb of sequence derived from the human transferrin receptor mRNA (Fig. 1). The mRNA is slightly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/311675b0
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