Wolfgang Steffen

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BACKGROUND Endovascular stent-graft placement is a new concept for the treatment of aortic dissection and aneurysm. Intravascular ultrasound (IVUS) with established diagnostic features may be instrumental in guiding endovascular procedures. METHODS We performed IVUS and digital angiography before, during, and after implantation of 47 stent grafts in 40(More)
AIMS The aim of this study was to assess the guideline-adherent feasibility of area-wide primary angioplasty in rural German surroundings and its impact on reperfusion and outcome in patients with acute ST-elevation myocardial infarction (STEMI). METHODS AND RESULTS All consecutive patients with acute STEMI (n = 347) admitted to any of the hospitals (5(More)
We present a flexible interactive 3D morpho-kinematical modeling application for astrophysics. Compared to other systems, our application reduces the restrictions on the physical assumptions, data type, and amount that is required for a reconstruction of an object's morphology. It is one of the first publicly available tools to apply interactive graphics to(More)
1 H and 13 C NMR spectra were recorded in deuterated solvents, such as CD 2 Cl 2 , on a Bruker DPX 250 and a Bruker DRX 500 spectrometer , using the proton or carbon signal of the solvent as an internal standard. The thermolysis reactions were carried out in sealed quartz tubes in a temperature controlled electromagnetic oven. SEM measurements were(More)
Based on axi-symmetric hydrodynamical simulations and 3D reconstructions with Shape, we investigate the kinematic signatures of deviations from homologous (" Hubble-type ") outflows in some typical shapes of planetary nebulae. We find that, in most situations considered in our simulations, the deviations from a Hubble-type flow are significant and(More)
Organometallic polymers were prepared by acyclic diyne metathesis (ADIMET) or by Pd-catalyzed coupling of 1,3-diethynylcyclobutadiene(cyclopentadienyl)cobalt with a suitably substituted diiodobenzene. The polymers obtained by Heck coupling show a degree of polymerization (Pn) of 20-60. The monomers for ADIMET were made by the Pd-catalyzed coupling of(More)
Distant astrophysical objects like planetary nebulae can normally only be observed from a single point of view, which makes deducing plausible 3D models a hard task that usually involves a lot of manual work [Nadeau et al. 2001]. However, additional physical assumptions can be used in order to estimate the missing depth information. In previous work [Wenger(More)