Thermogravimetric analysis of a coccolith-containing biogenic broth showed a three-step degradation process. According to this system behavior, the biogenic broth was heated to specific temperatures and characterized in terms of its morphology, surface chemistry, and crystallinity. The elemental and organic composition of the treated samples was also evaluated and compared to the reference material. The presented results were acquired in an effort to exploit pretreatment scenarios for such a biogenic system that would improve and support a separation process.

In this work, a 2D radial 23Na sequence with half-VERSE pulses was developed to reduce SAR and achieve ultra-short TEs. Simulations and measurements of the slice profiles showed good agreement between full- and half-VERSE pulses with a maximal deviation in the FWHM of 7%. In measurements, the TEmin was reduced from 1.41ms to 0.1ms by the use of half- instead of full-VERSE pulses. This resulted in an SNR gain of up to 18% in phantom, 7% in brain and 26% in calf measurements. Last, rapid single-slice 23Na images (2.9x2.9x12mm3) were obtained in a clinically feasible acquisition time of 2:56min.

Austernschalen stellen als Abfallprodukt eine große Umweltbelastung dar und die Wiederverwendung des Materials gewinnt zunehmend an Bedeutung. Da der Zerkleinerungsprozess beim Recycling von Sekundärrohstoffen die Eigenschaften des Materials definiert, wurden Austernschalen mit einer Planetenkugelmühle und einer Schlagradmühle zerkleinert und die gewonnenen Fraktionen in Bezug auf Größe und Form analysiert und miteinander verglichen. Ein Zerkleinerungsmaterial der Schlagradmühle wurde für eine Reihe von Benetzungsversuchen verwendet, die dazu beitrugen, die freie Oberflächenenergie des Materials nachzuweisen.

This work investigates the bias in the quantified relaxation times due to partial volume contributions of CSF for 23Na magnetic resonance fingerprinting (MRF) and reference methods. In simulations, a CSF contribution of only 10% resulted in an overestimation of 17% (31%) in T2l* in brain tissue for MRF (the reference). Further, a simple approach for CSF bias correction for 23Na MRF is proposed. This reduced the average absolute T1 deviation in brain tissue from 15% to 4%. The deviation in T2l* (T2s*) was reduced from 17% (35%) to 9% (5%). Finally, the correction was applied to in vivo MRF data.