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Mayka Schmitt Rahner

As seen in: MDPI
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Articles

Pore Structure Analysis of Growing Media Using X-Ray Microcomputed Tomography

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By Hadi Hamaaziz Muhammed, Ruediger Anlauf, Diemo Daum, Mayka Schmitt Rahner
| preprints.org
This study investigated the representative elementary volume (REV) for visible porosity in horticultural growing media (peat, commercial mixture, treated wood fibre/peat, pure wood fibre) using x-ray micro-computed tomography (µCT) with 2D and 3D image division, pore morphology, water retention curve (WRC), and saturated hydraulic conductivity (Ksat) via pore network modelling (PNM). Two sample sizes (10 x 10 cm, 3 x 3 cm, height x diameter) with resolutions of 46 and 15 µm were analysed.
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Worst-Case X-ray Photon Energies in Ultrashort Pulse Laser Processing

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By Katrin Böttcher, Mayka Schmitt Rahner, Ulf Stolzenberg, Sebastian Kraft
| MDPI
3.2. Spectroscopy during Ultrashort Pulse Laser Processing To evaluate the influence of pile-up effects or EMC on the spectra, the measurements were performed during the laser processing with and without a 50 µm thick copper foil. From the measurements without copper foil, the spectra after the transmission through the copper foil were calculated. This way, a comparison between the measurements with copper foil and the calculations could be performed.
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