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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 183-186 
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bulk nanocrystalline copper and nickel (average grain size ~ 50 nm) with high purity and density were synthesized by equichannel angular extrusion (ECAE). Both nanohardness and microhardness measurements revealed a significant increase in hardness of the bulk sample. The tensile strength of these materials has been found to be 5-6 times higher than conventional forms and our experiments show that Cu is extremely stable up to temperatures of 100 oC and Ni to temperatures of 250 oC. The fracture toughness, measured by the value of JIC for nc-copper and nickel have been found to be 21.66 KJ/m2 and 12.13 KJ/m2, respectively which are high for these strength levels
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 236-241 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A new development in MIM aims at the manufacturing of parts out of twomaterials, the Two Components Injection Molding, which allows the production of partswith different materials in distinct locations, obtaining different properties in distinctregions of the part. In this work an austenitic stainless steel was combined with toolsteel, based on the Two Components Injection Molding process, using dilatometricexperiments to analyze the behaviour of materials during sintering. Metallographicanalyses and tensile tests were made to verify the microstructure and the strength in thecontact area of the two materials
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-2451
    Keywords: Duplex Doppler ultrasound ; Liver transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer prospektiven Untersuchung wurde an 44 Patienten (33 Männer, 11 Frauen) riach einer elektiven orthotopen Lebertransplantation die Duplexsonographie 196ma1 angewendet. Ziel der Untersuchung war es festzustellen, inwieweit and in welchem zeitlichen Zusammenhang sich die Parameter pulsatiler FluBindex (PFI) und Dämpfungsindex (DI) bei Komplikationen wie Abstoβung und Cholangitis verändern. Der Duplex-Doppler-Ultraschall wurde im Mittel 5mal pro Patient durchgeführt. Die letzte Sonographie erfolgte am Entlassungstag. Bei den Messungen fiber der Leberarterie, der Pfortader und den Lebervenen wurden jeweils der PFI und der DI bestimmt. Die Ergebnisse der Indexuntersuchungen wurden mit dem klinischen Verlauf (Abstoβung, Cholangitis) sowie mit den Resultaten von 88 Biopsiepräparaten der Lebertransplantate in Beziehung gesetzt. Bezüglich einer histologisch gesicherten AbstoBung ergab der PFI (über der Leberarterie gemessen) eine Sensitivität von 69,4 % and eine Spezifitdt von 72,2 %, der DI (über den Lebervenen gemessen) eine Sensitivität von 89,4% und eine Spezifitdt von 89,1 %. Wenn auch die einfach und beliebig oft anwendbare Untersuchungstechnik die bioptische Sicherung einer Rejektion nicht ersetzen kann, so ist sie in hohem Maβe in der Lage, Indikationen zur Biopsie frühzeitig stellen zu lassen und ein Ansprechen auf eine Therapie kurzfristig und mit holier Genauigkeit anzuzeigen.
    Notes: Abstract In a prospective study, 44 patients (11 women, 33 men) who had received orthotopic liver transplants underwent a total of 196 consecutive duplex Doppler ultrasound examinations. The aim of the study was to evaluate the correlation between the pulsatile flow index (PFI) and the damping index (DI) as far as complications as rejection or cholangitis were concerned. The patients were examined five times each on average. The PFI and DI were measured in the hepatic artery, the portal vein and the hepatic veins. The findings were compared with the clinical course (cholangitis, rejection) and the histomorphological diagnosis as determined in biopsy specimens. In biopsy-proven rejection episodes, the sensitivity of the PFI in the hepatic artery was 69.4%, the specificity 72.2%. The sensitivity of the DI in the hepatic vein was 89.4%, the specificity 89.1 %. Combining the two, specificity was more than 90%. PFI and DI in the portal vein bore no apparent relation to clinical course or histomorphological diagnosis. We found duplex Doppler ultrasound extremely beneficial in determining the timing and indication for liver biopsy. In addition, this simple examination, which can be performed as often as desired, accurately shows the transplanted liver's response to measures taken to counter rejection.
    Type of Medium: Electronic Resource
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