The paper investigates recent transnational and trans-disciplinary knowledge trajectories on the basis of scholarly journals by focusing on the contemporary relationships, commonalities and differences between education research and educational psychology in three European countries: Germany, Italy and the United Kingdom. We investigate how education research and educational psychology are composed regarding authors, research topics and methodological standards. We also are interested in analysing how these disciplines are formed according to their mutual recognition and their specific communication patterns. The investigation is based on 70 more recent volumes of eight journals of education research and educational psychology, which are analysed according to social and disciplinary affiliation of authors and the methodological focus of articles. As a preliminary result of work in progress we identify different research patterns regarding nations and cultures on the one hand and regarding disciplines on the other.

Due to progress in the development of screw designs over recent decades, numerous high-performance screws have become commercially available in single-screw extrusion. While some of these advanced designs have been studied intensively, others have received comparatively less attention. We developed and validated a semi-numerical network-theory-based modeling approach to predicting flows of shear-thinning polymer melts in wave-dispersion screws. In the first part (Part A), we systematically reduced the complexity of the flow analysis by omitting the influence of the screw rotation on the conveying behavior of the wave zone. In this part (Part B), we extended the original theory by considering the drag flow imposed by the screw. Two- and three-dimensional melt-conveying models were combined to predict locally the conveying characteristics of the wave channels in a discretized flow network. Extensive experiments were performed on a laboratory single-screw extruder, using various barrel designs and wave-dispersion screws. The predictions of our semi-numerical modeling approach for the axial pressure profile along the wave-dispersion zone accurately reproduce the experimental data. Removing the need for time-consuming numerical simulations, this modeling approach enables fast analyses of the conveying behavior of wave-dispersion zones, thereby offering a useful tool for design and optimization studies and process troubleshooting.

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