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INTRODUCTION When using radial MR image acquisition techniques gradient or sampling delays due to hardware imperfections can cause mismatch between the expected and the actual k-space trajectory along the readout direction. To provide a robust and simple correction of such system delays we developed a new calibration method which is independent of using any… (More)
From the bark extract of Discaria febrifuga Mart. the known alkaloids frangufoline (I), adouétine (II), scutianine B (III), franganine (IV) and two new ones, discarine C (V) and D (VI), were isolated. Their structures are elucidated by degradation reactions and spectroscopic investigations.
The analysis of energy absorption behavior under crash test simulation is presented as the initial part of the second weight reduction analysis project. The demonstrative crash tests cover the existing front and side impacts with three different segments of the public vehicle models. The objective of the vehicle crash simulation is to investigate the energy… (More)
On the basis of spectroscopic investigations (1H-NMR, 13C-NMR, UV, IR and MS spectroscopy), elemental analysis and degradation reactions the structure of a new alkaloid discarine G from the bark extract of Discaria febrifuga Mart. is elucidated.