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  • 1990-1994  (5)
  • 1994  (5)
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  • 1990-1994  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Long pulse 250 keV electron gun for high-pressure gas lasers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 2941-2946 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design and performance of a secondary emission electron gun with a wire ionized plasma as an ion source is discussed. An electron beam current density of up to 100 mA/cm2 is obtained over an area of 55×5 cm2 at a cathode voltage of 250 kV in pulses with a duration of about 20 μs. The current distribution over the beam area is uniform to better than 25%. The achieved combination of pulse duration, beam current, and electron energy is attractive to excite high-pressure gas laser media. Preliminary results with the utilization of the gun in an electron beam sustained discharge excited atomic Xe laser show an output energy of 1 J/l at a wavelength of λ=1.73 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144582
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Formation and quenching mechanisms of the electron beam pumped (XeRb)+ ionic excimer in different buffer gases (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2471-2473 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ionic excimer molecule XeRb+ is formed in an electron beam excited gas mixture of Xe, Rb, and a buffer gas. The formation and quenching mechanisms of ionic excimers are investigated by measuring the XeRb+ fluorescence as a function of the gas composition and gas pressure. The formation of XeRb+ is achieved by a three-body association reaction between Xe+, Rb, and a buffer gas atom. For the buffer gases He, Ne, or Ar the values of the important formation rate constants are determined from the observed fluorescence signal decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111600
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gas-discharge XeF* (B→X) laser with high specific output energy (1994)
    Springer
    Applied physics 59 (1994), S. 533-535 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 42.60.By ; 52.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The discharge characteristics of the XeF* (B→X) laser are investigated. The NF3 and Xe partial pressure of the laser gas mixture and the total gas pressure have been varied. A highest specific output energy of 4.7 J/l with an efficiency of 0.5% was obtained from a X-ray preionized Ne/Xe/NF3 gas mixture at 6 bar with single-pulse excitation through a multichannel spark gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082396
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fracture healing: direct magnification versus conventional radiography (1994)
    Springer
    European radiology 4 (1994), S. 341-346 
    Details
    ISSN: 1432-1084
    Keywords: Fracture healing ; Magnification radiography ; Roentgen technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of the study was to evaluate the potential of magnification radiography in diagnosing fracture healing and assessing its complications. Seventy-three patients with fractures or who had undergone osteotomy were radiographed with both conventional (non-magnified) and magnification (5-fold) techniques. Since 10 patients were radiographed twice and 1 three times, 83 radiographs using each technique were obtained. All radiographs were analysed and the findings correlated with the patients' follow-up studies. The microfocal X-ray unit used for magnification radiography had a focal spot size of 20–130 μm. As an imaging system, digital luminescence radiography was employed with magnification, while normal film-screen systems were used with conventional radiography. Manification radiography proved superior to conventional radiography in 47% of cases: endosteal and periosteal callus formations were sen earlier and better in 26 cases, and osseous union could be evaluated with greater certainty in 33 cases. In 49% of cases magnification radiography was equal and in 4% inferior to conventional radiography. Additionally an “inter-observer analysis” was carried out. Anatomical and pathological structures were classified into one of four grades. Results were significantly (P 〈 0.01) better using magnification radiography. We conclude that the magnification technique is a good method for monitoring fracture healing in its early stages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00599068
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidation of copper by fast atomic oxygen (1994)
    Springer
    Oxidation of metals 42 (1994), S. 1-15 
    Details
    ISSN: 1573-4889
    Keywords: XPS ; AES ; XRD ; profilometry ; reflectance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The surface composition of the oxide formed on thin-film and solid OFHC copper samples exposed to a fast-atomic-oxygen environment in a low-earth orbit on NASA's Long Duration Exposure Facility (LDEF) was investigated using X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), thin-film X-ray diffraction (TF-XRD), high-resolution profilometry, and reflectance measurements. The results confirm that it is easier to form thick copper oxide layers in the atomic oxygen ambient than is normally possible with other laboratory-based techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061921
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    Paper (German National Licenses)
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