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  • 1990-1994  (3)
  • 1940-1944
  • 1994  (3)
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  • 1990-1994  (3)
  • 1940-1944
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  • 1
    Electronic Resource
    Electronic Resource
    Wideband characterisation of fading outdoor radio channels at 1800 MHz to support mobile radio system design (1994)
    Springer
    Wireless personal communications 1 (1994), S. 137-149 
    Details
    ISSN: 1572-834X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The characteristics of mobile radio channels place fundamental limits on the performance of mobile radio communication systems. Reliable information about these characteristics are obtained in this paper by analysing wideband propagation measurements, which were performed by using an high performance wideband channel sounder in mountainous areas in the German Alps and in typical urban areas in Munich. In addition to well known results obtained from propagation measurements in similar scenarios [1, 2], novel aspects of practical relevance enable for a realistic analysis of the performance of mobile radio systems in terms of the discussed channel parameters and support a compromise between system costs and the quality of signal processing with respect to the system availability and reliability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01098691
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Subthreshold antiproton andK − production in heavy ion collisions (1994)
    Springer
    The European physical journal 350 (1994), S. 101-113 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Subthreshold ¯p andK − and energeticπ − production was studied in Ne + NaF, Cu, Sn and Bi, and in Ni + Ni collisions with incident energies between 1.6 and 2 GeV/u. The measured cross sections indicate a dominant contribution of baryonic resonances. This is also consistent with a generalized scaling behaviour of the cross sections with the energy available in the collision and the energy necessary to produce particles as observed with Ne induced reactions. Deviations from scaling especially pronounced in the Ni-Ni system will be discussed in terms of absorption effects. The flat slope of the excitation function for ¯p production can be related to a reduced production threshold caused by a reduction of the antiproton mass in the dense and heated medium by about 100—150 MeV/c2. A similar in-medium mass reduction is also indicated forK − mesons. An increased ¯p reabsorption probability for the heavier systems is concluded from the comparison of the ¯p yields in Ne + NaF, Ne + Sn and Ni + Ni collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290678
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Modulation of in vitro immunoglobulin synthesis of human peripheral blood mononuclear cells by nicotine and cotinine (1994)
    Springer
    Journal of molecular medicine 72 (1994), S. 225-232 
    Details
    ISSN: 1432-1440
    Keywords: Nicotine ; Cotinine ; Immunoglobulin synthesis ; Immunoglobulin E ; Interleukins ; Peripheral blood mononuclear cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The influence of nicotine and its main metabolite cotinine on the spontaneous and cytokine-induced immunoglobulin synthesis was studied. The immunoglobulin (G,A) synthesis of peripheral blood mononuclear cells was altered by nicotine donor dependently in the concentration range from 10–6 to 10−8 M. Cotinine also modulates immunoglobulin (G, A) synthesis. The effective concentration range is about 100 fold higher. Only marginal effects on IgM synthesis were observed. Neither nicotine nor cotinine showed any effect on IgE production or on the IgE class switch. Moreover, both agents induced the production of the cytokines interleukin-1α, −2, −3, −4, and −6. Therefore it is suggested that the strongly donor-dependent heterogeneity in the response to nicotine or cotinine is the result of the fine balance of theinduced cytokines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189319
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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