[en] The boundary field of medical technology and its characteristics are described with the aid of selected examples. The most divergent physical principles have been used for blood flow determination so far although without great success. 'Classic' inherent gas measurement is described as well as, e.g., the dye dilution method, electromagnetic blood flow measurement, ultrasonic methods, and registration with the aid of nuclear magnetic resonance. The second set of problems deals with methods to determine the respiratory resistance. Finally, the fundamentals of a new radiological diagnostic method, computerized X-ray tomography, are outlined. (orig.)

[en] Mechanical components become deformed in three dimensions when subjected to asymmetrical thermal load, i.e. temperature gradients. For long components, such as occur in nuclear power plant refuelling machines, a calculation method has been derived which produces a dotted, two dimensional representation of the deflection line which occurs when the part is subjected to an asymmetrical temperature gradient field perpendicular to the longitudinal axis. (orig.)

[en] We report the results of dielectric spectroscopy, Fourier transformed infrared spectroscopy (FTIR) and atomic force microscopy (AFM) studies performed on the nematic liquid crystal (LC) mixture Merck ZLI-1132 filled with TiO₂ (rutile and anatase) and SiO₂ nanoparticles. The observed static dielectric permittivities are interpreted in terms of orientation of the LC with respect to the measuring electric field. Adding of SiO₂ particles mainly induces a statistical orientation of LC molecules, whereas TiO₂ particles promote the perpendicular orientation. The dynamics of LC molecules in all systems is very similar. The reason for the slightly faster reorientation observed in the mixtures may be connected with a disturbed nematic order near the surface of solid particles

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