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Bone Cements
Methyl methacrylate (MMA) is the basic component of bone cements. To use it, a dough is prepared from the liquid and powder by mixing right before application, which is normally done by the operating team. During its working phase the dough is then inserted into the tissue where polymerization is completed. Thus, the final implant polymethyl methacrylate (PMMA) is only created at the implantation site. Besides methyl methacrylate, bone cements sometimes contain other methacrylates, such as butyl methacrylate. To achieve X-ray opacity, radiopacifiers (zirconium dioxide or barium sulfate) are added to the powder. Both the liquid and powder components contain additives (initiator and activator)...
Computing for Science, Engineering, and Production
Wie rechnete man bevor es Computer gab? Mit welchen Rechenhilfsmitteln konnten Ingenieure Maschinen konstruieren, die sicher und effizient funktionierten, Architekten Bauwerke planen, deren Statik sicher war, Wissenschaftler aus Meßreihen die Gesetze der Natur errechnen, und Kaufleute Gewinn und Verlust zahlenmäßg im Griff haben? Mit Rechenschiebern, Rechenmaschinen, Tabellenwerken und mathematischen Spezialinstrumenten erbrachten unsere Vorfahren verblüffende Leistungen. Dies galt ganz besonders in der Zeit der Zweiten Industriellen Revolution zwischen der Mitte des 19. und des 20. Jahrhunderts, als eine ganze Reihe technischer Erfindungen das Leben dramatisch veränderte, wie Strom und...
Theory of the History Classroom
This volume proposes a theory of history education in formal classroom settings. Specifically, it aims to outline how the particular setting of the classroom interacts with domain-specific processes of historical thinking. The theory rests on the notion that formal school education is a communicative and social system, while historical thinking occurs in the psychological system of a person's historical consciousness. In the complex interaction of these systems, historical thinking, emotions, communication, media and language are of particular importance. Drawing upon educational theory as well as the theory of history, this theory of the history classroom provides a framework as well as a solid foundation for future empirical research, both for developing research questions as well as for interpreting findings.
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