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Matze meets... Podcast
(2023)
Die Welt kleiner Partikel
(2023)
Solid State Synthesis and Reflection Spectra of Ce2Zr3(MoO4)9:Ti and Ce2Zr3(MoO4)9:Ti,Eu, FEMS
(2023)
This study investigated the ability of electrically conductive carbon rovings to detect cracks in textile-reinforced concrete (TRC) structures. The key innovation lies in the integration of carbon rovings into the reinforcing textile, which not only contributes to the mechanical properties of the concrete structure but also eliminates the need for an additional sensory system, such as strain gauges, to monitor the structural health. Carbon rovings are integrated into a grid-like textile reinforcement that differs in binding type and dispersion concentration of the styrene butadiene rubber (SBR) coating. Ninety final samples were subjected to a four-point bending test in which the electrical changes of the carbon rovings were measured simultaneously to capture the strain. The mechanical results show that the SBR50-coated TRC samples with circular and elliptical cross-sectional shape achieved, with 1.55 kN, the highest bending tensile strength, which is also captured with a value of 0.65 Ω by the electrical impedance monitoring. The elongation and fracture of the rovings have a significant effect on the impedance mainly due to electrical resistance change. A correlation was found between the impedance change, binding type and coating. This suggests that the elongation and fracture mechanisms are affected by the number of outer and inner filaments, as well as the coating.
A new approach to determine the elements carbon, hydrogen, nitrogen and oxygen (CHNO) in polymers by wavelength-dispersive X-ray fluorescence analysis (WDXRF) in combination with partial least squares (PLS) regression was explored. The quantification of CHNO was achieved by using the Rayleigh and Compton scattering spectra of an Rh X-ray tube from 84 different polymers. Concealed differences of the corresponding scattering spectra could be utilized to quantify CHNO in a multivariate manner. It was shown that the developed model was capable of determining these commonly non-measurable matrix elements in polymers using WDXRF. Furthermore, the influence of spectral resolution, which is given by the collimator and the crystal, on the prediction of CHNO was explored in this study. It was found that minimal spectral resolution led to the most accurate CHNO predictions. Information about matrix composition could be used to improve so-called semi-quantitative XRF methods based on fundamental parameters (FP) for the analysis of plastics, soil or other samples with high organic content.
Semiconductors
(2022)
UV emitting nanoparticles enhance the effect of ionizing radiation in 3D lung cancer spheroids
(2022)
Crystallographic and Photoluminescence Studies on the Solid Solution Li3Ba2La3–xPrx(WO4)8 (x = 0-3
(2022)
Spectroscopic Studies on Pr3+ Doped LuPO4 and YPO4 upon VUV and Synchrotron Radiation Excitation
(2022)
Eloxal and Particle Coatings
(2022)
Up-Converters
(2022)
Scintillators
(2022)
Inorganic Detetor Materials
(2022)