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  • 1985-1989  (6)
  • 1980-1984
  • 1989  (6)
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Material
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  • 1985-1989  (6)
  • 1980-1984
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Photocurrent spectroscopy of InxGa1−xAs/GaAs multiple quantum wells (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2230-2232 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photocurrent spectra of InxGa1−xAs/GaAs multiple quantum well structures grown by molecular beam epitaxy are studied in the presence of electric fields perpendicular to the heterointerface. Several Δn=0 allowed and Δn≠0 forbidden excitonic transitions are observed. Both negative and positive shifts of exciton transitions are found. Good agreement is found between the photocurrent observations and calculations using a multiband effective-mass approach, taking into account the strain-induced splitting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101132
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    THE EFFECT OF SPECIMEN SIZE ON THE CTOD R-CURVE BEHAVIOUR OF A TITANIUM ALLOY (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 12 (1989), 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: Abstract— —This paper presents preliminary results from a large experimental programme to study geometry and size effects in CTOD R-curves. The results presented were obtained from unloading compliance R-curve tests performed at room temperature on different sized single-edge-notch bend specimens made from Ti–3Al–2V alloy. The crack growth resistance was measured in terms of both the conventional CTOD, δ0, (i.e. as defined in BS 5762) and CTOD corrected for crack growth, δR. It was found that the δ0 and δR R-curves were independent of specimen size up to crack extensions corresponding to approximately 10–15% of the original uncracked ligament. Also, after crack extensions of 30–40% of the initial ligament the δ0 and δR R-curves exhibited well defined upswings. The upswing in the CTOD R-curves is thought to be a result of a reduction in crack tip constraint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1989.tb00539.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    EXPERIMENTAL CHARACTERISATION OF DYNAMIC TENSILE AND FRACTURE TOUGHNESS PROPERTIES (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 12 (1989), 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: Abstract— —An experimental procedure for obtaining material tensile and fracture toughness properties at rates applicable to shock loading is reported. A variant of the key curve approach to determine dynamic J-R curves is described and results are presented for a nickel aluminium bronze alloy for actuator loading rates in the range 0.75–7500 mm/s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1989.tb00550.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    THE EFFECT OF SPECIMEN SIZE ON THE J R-CURVE BEHAVIOUR OF A TITANIUM ALLOY (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 12 (1989), 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: Abstract— —This paper presents preliminary results from a large experimental programme to study geometry and size effects in J R-curves, The results presented were obtained from unloading compliance R-curve tests performed at room temperature on different sized single-edge-notch-bend specimens made from Ti-3Al–2V alloy. The crack growth resistance was measured in terms of the standard fracture resistance J (i.e. not corrected for crack growth), J corrected for crack growth, and the J modified parameter proposed by Ernst. It was found that the best agreement was exhibited by the R-curves based on the standard fracture resistance J, which displayed reasonable size independence up to, and in many cases beyond crack growths corresponding to 50% of the initial uncracked ligament.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1989.tb00538.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetic effects of a kairomone in moth scales of the European corn borer onTrichogramma nubilale Ertle & Davis (Hymenoptera: Trichogrammatidae) (1989)
    Springer
    Journal of insect behavior 2 (1989), S. 123-131 
    Details
    ISSN: 1572-8889
    Keywords: behavior ; kairomone ; kinesis ; Ostrinia nubilalis ; Trichogramma nubilale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053622
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Depletion on volcanic aerosols (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 269-270 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] VOLCANO eruptions can so disturb the stratosphere that they may lead to significant destruction of ozone, according to new work by Hofmann and Solomon1. The effect was apparent after the massive eruption at El Chichon in 1982 which injected large quantities of sulphur dioxide into the stratosphere. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/340269a0
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    Paper (German National Licenses)
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