Daniel Poetzsch

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The proton conductivity of mixed hole-, oxygen ion- and proton-conducting Ba0.5Sr0.5Fe0.8Zn0.2O3-δ (BSFZ), a potential cathode material for fuel cells based on oxidic proton-conducting electrolytes, was determined from the weight changes of dense pellets upon changing pH2O (and pD2O). The obtained proton concentrations at 20 mbar pH2O range from 1.3 to 0.32(More)
Case report concerning a young man in whom exudative retinitis had occurred as a result of the A-V shunt of a retinal angioma, leading to sudden loss of vision. With argon laser and xenon arc photocoagulation a minor hemorrhage cleared up spontaneously, the retina remained attached and vision increased to 20/25 within 1 year. The authors believe that the(More)
Choroidal osteoma caused blurred vision in a 45-year-old man. Ophthalmoscopy showed a characteristic tumor with irregular elevation and of a yellowish color with a vascular network on the surface. Ultrasonic A-scan findings, hyperfluorescence in angiograms and visibility on computer tomograms confirmed the diagnosis, even though the patient's age and sex,(More)
Thermogravimetric investigations on the perovskite Ba(0.5)Sr(0.5)Fe(0.8)Zn(0.2)O(3-δ) (BSFZ, with mixed hole, oxygen vacancy and proton conductivity) from water vapor can occur by acid-base reaction (hydration) or redox reaction (hydrogen uptake), depending on the oxygen partial pressure, i.e. on the material's defect concentrations. In parallel, the(More)
The new generation of intraocular lenses placed in the sulcus or in the bag allows implantation even in glaucoma patients under certain conditions. Patients with intraocular pressure between 25 and 30 mm Hg underwent Argon laser trabeculoplasty before implantation. In patients with regulated intraocular pressure between 15 and 20 mm Hg not even an(More)
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