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  • 1990-1994  (2)
  • 1975-1979  (2)
  • 1990  (2)
  • 1979  (2)
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  • 1990-1994  (2)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Production of high-energy photons from flash x-ray sources powered by stacked Blumlein generators (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1448-1456 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Described here is the design and construction of a pulse-power generator capable of discharging at high repetition rates. It consists of eight triaxial Blumleins stacked in series at one end. These lines are charged in parallel and synchronously commuted with a single thyratron at the other end to produce an open circuit voltage across a stack of six times the charging voltage. An x-ray diode has been constructed and matched to this pulse-power source making possible the emission of an average bremsstrahlung exposure rate of 17 R/S from a sequence of 40-ns pulses. When operated at 60-kV charging voltage, direct spectral measurements show the output to be a true continuum, peaking at intensities in excess of 5×108 photons/keV/shot and containing useful intensities of photons having energies of 300 keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141150
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Amorphic diamond films produced by a laser plasma source (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2081-2087 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, attention has been focused upon laser plasma sources of thin-film diamond. These depend upon laser-ignited discharges in which intense pulsed currents flow through the small volume of carbon plasma ablated from graphite feedstock by a focused laser beam. The materials produced in this way generally resemble the hard amorphic films deposited by ion beams. This paper reports a detailed characterization of these films which we call amorphic diamond. The combination of an optical band gap of 1.0 eV with a grain size of 100–200 A(ring) places this material far outside the range of possibilities available to the model of graphitic islands. A structure of very fine grained diamond would more readily explain the hardness of 13 GPa determined in the absence of any measurable fraction of hydrogen. Such amorphic diamond films have been grown uniformly on 100-cm2 areas at ambient room temperatures with no seeding or abrasion of the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345566
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Intrinsic symmetries in general relativity (1979)
    Springer
    General relativity and gravitation 10 (1979), S. 925-929 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A discussion is presented which indicates that a stagnation point is being reached in the standard applications of symmetries (especially isometries) in general relativity. In order to continue the advance of this area of research, an attractive alternative is suggested. This alternative involves the use of what are termed “intrinsic symmetries.” With this technique, emphasis is placed on underlying symmetries ofsubmanifolds. One particular set of symmetries gives rise to an invariant formulation of the Szekeres inhomogeneous cosmological models, and suggests quite natural generalizations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756756
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Cosmological singularities: Some specific examples (1979)
    Springer
    General relativity and gravitation 10 (1979), S. 1021-1024 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776525
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    Paper (German National Licenses)
    Fulltext
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