Nickel(II) catalysed co-polymerisation of CO and ethene:Formation of polyketone vs. polyethylene - The role of co-catalysts

\u3cp\u3eThe square planar Ni complex (SP-4-3)-[Ni(2-tol)(PPh\u3csub\u3e3\u3c/sub\u3e)(N,O)] (N,O = (Z)-4,4,5,5,6,6,6-heptafluoro-3-oxo-2-(pyrrolidine-2-ylidene)- hexanenitrile) is an active catalyst for the co-polymerisation of CO and ethene yielding aliphatic polyketone. Addition of Lewis acids like BPh\u3csub\u3e3\u3c/sub\u3e or B(C\u3csub\u3e6\u3c/sub\u3eF\u3csub\u3e5\u3c/sub\u3e)\u3csub\u3e3\u3c/sub\u3e as co-catalyst accelerates the polymerisation but not the lifetime of the catalyst and leads to a mixture of polyethylene and polyketone. Addition of the Lewis base triphenylphosphane (PPh\u3csub\u3e3\u3c/sub\u3e) completely suppresses the formation of polyethylene. The polymers formed were characterised by IR spectroscopy, \u3csup\u3e13\u3c/sup\u3eC cross polarisation (CP) magic angle spinning (MAS) solid state NMR spectroscopy, differential scanning calorimetry (DSC) and size exclusion chromatography (SEC).\u3c/p\u3

Building a Driving Simulator with Parallax Barrier Displays

In this paper, we present an optimized 3D stereoscopic display based on parallax barriers for a driving simulator. The overall purpose of the simulator is to enable user studies in a reproducible environment under controlled conditions to test and evaluate advanced driver assistance systems. Our contribution and the focus of this article is a visualization based on parallax barriers with (I) a-priori optimized barrier patterns and (II) an iterative calibration algorithm to further reduce visualization errors introduced by production inaccuracies. The result is an optimized 3D stereoscopic display perfectly integrated into its environment such that a single user in the simulator environment sees a stereoscopic image without having to wear specialized eye-wear