2024_31/2

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https://dspace.tul.cz/handle/15240/175340

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Browsing 2024_31/2 by Subject "Dynamic position"

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    THE EFFECT OF COMPRESSION STOCKING ON LEGS’ GEOMETRY CHANGES WITHIN DIFFERENT MOVEMENT
    (Technical University of Liberec, ) Kyzymchuk, Olena; Riabchykov, Mykola; Kyosev, Yordan; Melnyk, Liudmyla; Boll, Jessika; Technická univerzita v Liberci
    In this study, the changes in leg size and shape as well as pressure at different sites of a lower leg were investigated using advanced tools such as the Move4D scan system and Texsens pressure measuring device. The effect of the class of compression stocking, wearing time, and movement type was analyzed for one volunteer. It is the basis for the high-accuracy ready-to-wear compression stocking development based on the concept of personalization.
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    SYNCHROTRON BASED X-RAY ABSORPTION SPECTROS-COPY FOR STRUCTURAL ANALYSIS OF BASALT FIBERS
    (Technical University of Liberec, ) Lichtenberg, Henning; Mahltig, Boris; Klysubun, Wantana; Prange, Alexander; Hormes, Josef; Technická univerzita v Liberci
    X-ray Absorption Near Edge Structure (XANES) spectroscopy at the Synchrotron Light Research Institute (Thailand) was used to investigate temperature related structural changes in basalt fibers. As a first step, XANES spectra of fiber samples cut from a basalt roving heated for 1 hour at 800 °C were recorded at the K absorption edges of three chemical elements and compared with the spectra of the untreated fibers. Silicon and calcium K-edge XANES spectra of the fibers were not affected by heating, whereas iron K-edge XANES spectra were significantly influenced by heating at 800 °C. The high iron content in basalt fibers has been attributed to their higher thermal stability compared to common natural or synthetic fibers. As a next step, iron K-edge XANES spectra of two types of fibers (basalt roving and uncoated chopped fibers) were recorded after heating at temperatures between 600 °C and 900 °C. In both cases, with increasing temperature the absorption edge shifts to higher energies, indicating progressing oxidation of the iron atoms in the fibers. These experiments demonstrate the potential of X-ray absorption spectroscopy as a powerful analytical tool to investigate structural changes in basalt fibers upon heating and to correlate them with changes in their mechanical properties.