Tragwerke aus Textilbeton – Berechnungsmodelle,Anwendungen

Textile concrete structures – computational models and applications. Structures with reinforcement consisting of textile fabrics are innovative developments in civil engineering. The textile reinforcement embedded in finegrained concrete can be applied for new constructions or supplementary strengthenings. Computational models and applications of textile concrete structures are presented in the paper, which are produced in the Collaborative Research Centre 528. The generalized treatment of uncertain datas is especially pointed out, because data uncertainty influences the structural responses significantly.     

Dielectric properties and tunability of BST and BZT thick films for microwave applications

Abstract

Dielectric properties and tunability of Ba_0.60Sr_0.40TiO₃ (BST) and BaZr_0.25Ti_0.75O₃ (BZT) thick films and bulk ceramics have been investigated as a function of temperature (90 K - 320 K) in the kHz region. Thick films show compared to bulk ceramics low permittivity and a very broad ferroelectric phase transition which leads to low temperature dependence of tunability. Tunability of 30% can be achieved with an external field of 2 kV/mm. Measurements in the microwave region adumbrate that the dielectric losses of BZT are about three times higher than that of BST thick films.     

Anwendung der Merkmalsklassenanalyse auf feinkörnige Reststoffe aus der Eisen- und Stahlindustrie

Pyrometallurgical processes invariably yield large amounts of fine residues containing high grades of valuable elements, but often also of detrimental ones. Instead of being disposed of entirely they can be treated by means of mineral processing techniques and recycled, which requires prior characterisation of the dusts‘ relevant properties. A range of residues from iron and steel production was subject to fractional analysis. As common findings, magnetic separation is not able to split the valuable and detrimental elements in these samples whereas air classifying does work. Portability of this approach onto other metallurgical areas and other types of business is presumed.