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  • 1
    Electronic Resource
    Electronic Resource
    Quantum vacuum noise in physics and cosmology (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 11 (2001), S. 539-547 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The concept of the vacuum in quantum field theory is a subtle one. Vacuum states have a rich and complex set of properties that produce distinctive, though usually exceedingly small, physical effects. Quantum vacuum noise is familiar in optical and electronic devices, but in this paper I wish to consider extending the discussion to systems in which gravitation, or large accelerations, are important. This leads to the prediction of vacuum friction: The quantum vacuum can act in a manner reminiscent of a viscous fluid. One result is that rapidly changing gravitational fields can create particles from the vacuum, and in turn the backreaction on the gravitational dynamics operates like a damping force. I consider such effects in early universe cosmology and the theory of quantum black holes, including the possibility that the large-scale structure of the universe might be produced by quantum vacuum noise in an early inflationary phase. I also discuss the curious phenomenon that an observer who accelerates through a quantum vacuum perceives a bath of thermal radiation closely analogous to Hawking radiation from black holes, even though an inertial observer registers no particles. The effects predicted raise very deep and unresolved issues about the nature of quantum particles, the role of the observer, and the relationship between the quantum vacuum and the concepts of information and entropy. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1378796
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  • 2
    Electronic Resource
    Electronic Resource
    The LMA and difficulty with internal jugular vein cannulation (1999)
    Oxford : Blackwell Science Ltd
    Anaesthesia 54 (1999), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2044.1999.01223.x
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  • 3
    Electronic Resource
    Electronic Resource
    Timing time (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 290-292 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has been predicted for 60 years that time runs faster in space than on Earth. Now the prediction has been verified by a direct experiment in which a high-precision clock-an atomic hydrogen maser-was flown into space on board a spacecraft. In a recent issue of General Relativity and Gravitation, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279290b0
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  • 4
    Electronic Resource
    Electronic Resource
    Inflation and time asymmetry in the Universe (1983)
    [s.l.] : Nature Publishing Group
    Nature 301 (1983), S. 398-400 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Most discussions of the origin of 'time's arrow' appeal ultimately to cosmology5. There is a paradox that, according to the standard hot big-bang model, the material contents of the Universe began in a condition of thermodynamic equilibrium (primeval chaos), whereas the Universe today is highly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/301398a0
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  • 5
    Electronic Resource
    Electronic Resource
    STRESS TENSOR CALCULATIONS AND CONFORMAL ANOMALIES (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 302 (1977), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1977.tb37046.x
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    THE EFFECT OF STRAIN RATE ON THE TENSILE AND FRACTURE PROPERTIES OF BS 4360 ‘A’ GRADE SHIP STEEL (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 14 (1991), 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— The results of high rate tensile and compact tension fracture toughness tests conducted on BS 4360 ‘A’ grade ship steel are presented. Tensile results are reported for strain rates within the range 10–2–103/s and fracture toughness values at rates of increase of J integral within the range 103–106 N/mm/s. The tensile properties of upper yield, lower yield and UTS are shown to be linearly dependent on the logarithm of strain rate whilst fracture toughness is shown to decrease with increasing loading rate prior to approaching a minimum value. The decrease in fracture toughness with increasing test rate is shown to be related to a change in the micro-mechanism of fracture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1991.tb00648.x
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  • 8
    Electronic Resource
    Electronic Resource
    Inflation in the universe and time asymmetry (1984)
    [s.l.] : Nature Publishing Group
    Nature 312 (1984), S. 524-527 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The universe is ordered in two distinct ways. First, matter (for example stars) is generally found in a state rather far from thermodynamic equilibrium. Second, the universe is mysteriously regular on a larger scale, with only a moderate degree of structure, occasioned by the clumping of material ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/312524a0
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  • 9
    Electronic Resource
    Electronic Resource
    Primaeval heavy leptons (1977)
    [s.l.] : Nature Publishing Group
    Nature 269 (1977), S. 560-561 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DISCOVERIES in subatomic particle physics take place against a continual struggle for more technology and money. The Universe enjoys complete freedom from these worries and produces for free events which may tax human resources to the limit. During the big bang, exceedingly high temperatures and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/269560a0
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  • 10
    Electronic Resource
    Electronic Resource
    Ball Lightning or Spots before the Eyes ? (1971)
    [s.l.] : Nature Publishing Group
    Nature 230 (1971), S. 576-577 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Argyle attempts to explain ball lightning in terms of positive after-images, which have certain properties in common with the former. There seem to be two overriding objections to this conjecture. First, it is hard to understand the unanimity of description in cases where there have been many ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/230576c0
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