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  • 1
    Electronic Resource
    Electronic Resource
    Low-flux neutron irradiation of ceramic YBa2 Cu3O7−δ (1990)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 1017-1020 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Pellets of sintered YBa2Cu3O7−δ with three different oxygen contents have been irradiated with fast neutron beams of energies 6.5, 3.3 and 4.4 MeV at fluences of 7.7·104, 1.3·105 and 1.4·109 n/cm2, respectively. The radiation damage has been investigated by comparing the critical temperature (T c mid ), the zero resistivity and the onset temperature before and after neutron irradiation. The critical current has been measured for a few samples in the same experimental conditions. In all transport measurements two different responses to the neutron radiation are observed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453047
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Modulation of HTSC characteristics induced by proton irradiation (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1933-1939 
    Details
    ISSN: 0392-6737
    Keywords: Flux pinning, flux creep, and flux-line lattice dynamics ; Critical currents ; Material effects onT c, κ, critical currents (including impurities, ion implantation, etc.) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Bulk slabs of sintered YBCO were irradiated with monoenergetic protons at different energies (3.5 and 6.5 MeV) and different fluences, ranging from 1.8·1016 to 8.6·1016 p/cm2. The effects on intergrain critical currents of protons crossing the sample and the effects of protons implanting in the specimen, has been studied by means of a.c. susceptibility characterizations. D.c. hysteresis cycles were measured in low fields in order to investigate the modifications in the intergrain critical current density due to proton implantation. The main result is the evidence that the intergrainJ c response to the applied field can be modulated by means of the proton irradiation. Resistive measurements were also performed in order to investigate the complex transport phenomena in polycrystalline materials. Irradiation-induced effects on both superconducting- and normal-state resistivity are studied. The addition of extrinsic defects can lead to enhanced transport properties, emerging especially when a magnetic field is applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462196
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Apparatus for transport characterisation of high-T c superconductors (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1877-1884 
    Details
    ISSN: 0392-6737
    Keywords: Superconductivity: Critical currents ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A full set of facilities for transport characterisation of HTS as well as a set of crucial measurements are presented which point out the possible sources of errors of the «home-made» apparatus. The main characteristics are the automatisation of the whole data acquisition, the appositely designed hardware and software with suitable error messages, the on-line statistical treatment of data, the possibility of on-line optimisation of the current pulses and finally the availability of quasi-static temperature conditions in theR vs. T curves. The d.c. four-point method with bipolar d.c. pulsed current is employed. The experimental techniques chosen to obtain specific metrological achievements are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462188
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of proton-induced defects on transport and structural properties of ceramic YBCO (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 237-241 
    Details
    ISSN: 1572-9605
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Previous and recent results on transport properties of sintered YBCO before and after 6.5 MeV proton implantation are reported. The samples under study come from two different batches, processed by nominally identical preparation methods. For the first batch, irradiation produces enhancement of the critical current density, while for the second one an average damage is observed. An SEM analysis of two different samples shows dissimilar preirradiation grain boundary structures. We infer that these different structures are responsible for the dissimilar response to the irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626263
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Critical currents and dissipative effects in proton-irradiated ceramic YBCO and BISCO (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 185-189 
    Details
    ISSN: 1572-9605
    Keywords: Proton irradiation ; critical current ; YBaCuO ; BiSrCaCuO
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Transport properties in pellets of YBCO and BISCO are studied before and after 6.5-MeV proton implantation. The average critical current was strongly enhanced but in one case also weakened, probably due to the unfavorable interaction with the pre-irradiation defect structure. Characteristic parameters are compared and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618065
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  • 6
    Electronic Resource
    Electronic Resource
    Nosocomial outbreak of severe Pseudomonas aeruginosa infections in haematological patients (1993)
    Springer
    European journal of epidemiology 9 (1993), S. 390-395 
    Details
    ISSN: 1573-7284
    Keywords: Pseudomonas aeruginosa ; Nosocomial infection ; Environmental contamination ; Haematological patients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract From June to September 1988, an outbreak of Pseudomonas aeruginosa infections in neutropenic patients admitted to the Haematological Wards of “Ospedali Riuniti” in Bergamo, Italy, was detected. Out of 11 cases of P. aeruginosa infections, 8 were bacteremic. Of these, 7 died within few days of onset (mortality rate: 87.5%). Consequently, possible sources of infection were investigated, and moist areas of the hospital environment were shown to be highly contaminated by P. aeruginosa. A clinical and microbiological follow-up of patients admitted to the Haematological Wards was performed for a 10 month period following the outbreak. Adequate measures for cleaning and disinfection were shown to reduce the frequency of P. aeruginosa hospital infections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157395
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    Paper (German National Licenses)
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