Efficiency evaluation of a C Magnetic Resonance birdcage coil: Theory and comparison of four methods

Radiofrequency coils in Magnetic Resonance systems are used to produce a homogeneous B₁ field for exciting the nuclei and to pick up the signals emitted by the nuclei with high signal-to-noise ratio. Accordingly, coil performance affects strongly the quality of the obtained data and images.     

Hybrid Devices by Selective and Conformal Deposition of PtSe2 at Low Temperatures

2D materials display very promising intrinsic material properties, with multiple applications in electronics, photonics, and sensing. In particular layered platinum diselenide has shown high potential due to its layer-dependent tunable bandgap, low-temperature growth, and high environmental stability. Here, the conformal and area selective (AS) low-temperature growth of layered PtSe₂ is presented defining a new paradigm for 2D material integration. The thermally-assisted conversion of platinum which is deposited by AS atomic layer deposition to PtSe₂ is demonstrated on various substrates with a distinct 3D topography. Further the viability of the approach is presented by successful on-chip integration of hybrid semiconductor devices, namely by the manufacture of a highly sensitive ammonia sensors channel with 3D topography and fully integrated infrared-photodetectors on silicon photonics waveguides. The presented methodologies of conformal and AS growth therefore lay the foundation for new design routes for the synthesis of more complex hybrid structures with 2D materials.     

Investigations on Metal Injection Molding of 316L Stainless Steel

Metal Injection Molding (MIM) was performed with water atomized and gas atomized 316L stainless steel powders and powder blends thereof. Feedstocks were prepared using a thermoplastic binder system and subsequently molded into tensile test specimens. Different debinding procedures and sintering treatments were applied and their influence on carbon content in the product was compared. Chemical decomposition processes of the binder and the influence of powder morphology on debinding and sintering behaviour are discussed. Shrinkage of the MIM-fabricated parts was examined and correlated to the powder characteristics. As a result a procedure is suggested to achieve mechanical properties expected for 316L stainless steel.     

Charakterisierung von Grapefruit?l und -saft durch HPLC

Zusammenfassung Es wird eine schnelle und zuverlässige HPLC-Methode zur Charakterisierung von Grapefruitöl und -saft vorgestellt. Der individuelle Gehalt an Nootkaton, einem wichtigen Aromabestandteil von Grapefruit, wurde in einigen Proben unterschiedlicher Herkunft bestimmt. Die Nachweisgrenze von Nootkaton liegt bei ca. 0,05%. In dem nicht flüchtigen Anteil des Öls wurden Cumarine und Furocumarine spektrophotometrisch bei 310 nm delektiert. Die nachgewiesenen Inhaltsstoffe wurden mittels LC-MS, GC-MS und nach säulenchromatographischer Isolierung aus Grapefruitöl auch mittels¹H- und¹³C-NMR-Spektroskopie identifiziert. Eine der identifizierten Verbindungen, 5-[(6-Hydroxy-3,7-di-methyl-2,7-octadienyl)oxy]cumarin wird erstmals als Inhaltsstoff von Grapefruit beschrieben.

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Characterization of grapefruit oil and grapefruit juice by HPLC

Summary A rapid and reliable HPLC method is presented for the characterization of grapefruit oils and grapefruit juice. The individual amount of nootkatone, an important flavouring constituent in grapefruit, has been determined in some samples of different origin. The detection limit of nootkatone is at approximately 0.05%. In the non-volatile fraction of the oil, some coumarins and furocoumarins have been detected spectrophotometrically at 310 nm. The recognized constituents have been identified by LC-MS, GC-MS and after isolation from grapefruit oil also by¹H- and¹³C-NMR-spectroscopy. One of the identified compounds, 5-[(6-Hydroxy-3,7-di-methyl-2,7-octadienyl)-oxy]coumarin is reported for the first time as a constituent of grapefruit.