One of sheet severe plastic deformation (SPD) operation, namely constrained groove pressing (CGP), is investigated here in order to specify the optimum values for geometrical variables of this process on pure aluminium sheets. With this regard, two different objective functions, i.e. the uniformity in the effective strain distribution and the necessary force per unit weight of the specimen, are...

Low-temperature incipient melting and high deformation resistance of aluminium alloy AA7075 place extraordinary demands on extrusion die design and process optimization, especially when the shape of the extrudate is complex. The present case study was aimed at combining the considerations on die design and process optimization for the alloy to manufacture a complex solid profile with large diff...

Background The performance of TVS, TRS and MRI for the diagnosis of DIE have been separately reported in earlier studies. However, the three methods have not been concurrently compared in terms of their overall performance and classified results as per different anatomical locations of DIE lesions in a large study population. This study was an attempt to compare pelvic magnetic resonance imagin...

Die vorliegende Arbeit gewährt Einblick in biochemische Signalwege, die in verschiedenen Zellsystemen zu apoptotischem Zelltod nach Behandlung mit Zytostatika führen. Die Arbeit überspannt zwei Bereiche: die Identifizierung des initiierenden Signalweges bei Zytostatika-induzierter Apoptose in der humanen B-Zell Lymphom Zellinie BJAB und Einblick in Apoptose-bezogene Ereignisse, die durch Zytost...

Axial zu Polymeren verbrückte Metallphthalocyanine [PcMX]„ mit M = Si, Ge, Sn; X = 0 und M = AI, Ga, Cr; X = F zeigen elektrische Leitfähigkeiten zwischen 10 -8 und 10~12 S/cm. Nach Dotierung mit Iod steigt die Leitfähigkeit um 5-8 Größenordnungen auf bis zu 1 S/cm an [1, 2]. Sowohl die fluorals auch die sauerstoffüberbrückten Polymere [PcMX]n sind in organischen Lösungsmitteln unlöslich und kö...

Forging dies at high temperatures are under contact pressure, variable mechanical loads and thermal shock, furthermore they should withstand wear and friction in a high level. So, in order to increase die life, the selection of die material, coating and hardness is essential. In this review, various methods used for die life enhancement such as carbide coating, using the super alloy stellite 6 ...