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  • 1
    Electronic Resource
    Electronic Resource
    Exogenous or endogenous reservoirs of nosocomialPseudomonas aeruginosa andStaphylococcus aureus infections in a surgical intensive care unit (1993)
    Springer
    Intensive care medicine 19 (1993), S. 161-165 
    Details
    ISSN: 1432-1238
    Keywords: Nosocomial infections ; Intensive care unit ; Staphylococcus aureus ; Pseudomonas aeruginosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective A 4 month prospective study was performed to assess the incidence and routes of endogenous or exogenous colonization and nosocomial infection caused byStaphylococcus aureus andPseudomonas aeruginosa in surgical critically ill patients. Design A total of 4634 specimens ware obtained. Patient's nasal, scalp, and rectal swabs as well as tracheal secretion (TS) were cultured every second day beginning on the day of admission. Nasal swabs and hand cultures of the personnel as well as cultures from gowns were also taken. all isolates ofS. aureus were phage typed and 116 of these isolates were also plasmid typed.P. aeruginosa isolates were sero-and pyocin typed. Resistance patterns were determined in all isolates. Setting The suty was carried out in the surgical intensive care unit (SICU) of an teaching hospital. Patients During the study period each patient (a total of 153 patients) admitted to the SICU entered the study. Results P. aeruginosa andS. aureus colonisation rate on admission were 5% and 36.5% respectively. Only 10 patients (6.5%) were colonized withP. aeruginosa during hospitalization, and only 7 patients (4.5%) acquiredS. aureus in the surgical intensive care unit (SICU). The most common primary colonisation site ofP. aeruginosa was the rectum, whereasS. aureus was predominantly found in nasal cultures. Horizontal transmission ofS. aureus occured in only 2 patients. Conclusion The study suggests that colonisation withP. aeruginosa andS. aureus occurs from endogenous rather than from exogenous sources and that the endogenous acquisition of both bacteria play a more important role in development of nosocomial infections than the exogenous route of transmission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01720533
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  • 2
    Electronic Resource
    Electronic Resource
    Mill setting and microstructural evolution during mechanical alloying of Mg2Si (1998)
    Springer
    Journal of materials science 33 (1998), S. 3427-3431 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The mechanical alloying behaviour of magnesium and silicon to form the intermetallic compound Mg2Si and the optimum setting of a planetary ball mill for this task, were examined. For the ductile–brittle magnesium–silicon system it was found that the efficiency of the mill is mostly influenced by the ratio of the angular velocity of the planetary wheel to that of the system wheel and the amount of load. The examination of the kinetics inside the planetary ball mill for different mill settings showed that a ratio of angular velocities of at least 3 is necessary to compensate the reduction of efficiency due to slip. The optimum powder load for the 500 ml vial was found to be 10–20 g. The milling process starts with elemental magnesium and silicon bulk particles. During the milling, the silicon pieces are rapidly diminished and together with the constantly forming Mg2Si they act as an emery powder for the magnesium bulk pieces. Simultaneous to the diminution of the magnesium, alloying occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1013257902279
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical contacts for FeSi2 and higher manganese silicide thermoelectric elements (1995)
    Springer
    Journal of materials science 6 (1995), S. 182-185 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A furnace was constructed to solder thermoelectric materials at high temperatures in vacuum or a gas atmosphere. Electrical junctions for the hot side of a thermoelectric generator consisting of FeSi2 and higher manganese suicide were developed. Material for the junction is TiSi2 soldered with ‘Ti-activated’ Ag. Contact resistivity was found to be low compared to the material's resistances and stable against the thermal stress at the working temperature. Electron microscopic investigations did not detect any ageing process. The results support the applicability of the developed contacts in a thermoelectric generator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190552
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    Paper (German National Licenses)
    Fulltext
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