Ulrike Wallrabe

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We present a completely revised generation of a modular micro-NMR detector, featuring an active sample volume of ∼ 100 nL, and an improvement of 87% in probe efficiency. The detector is capable of rapidly screening different samples using exchangeable, application-specific, MEMS-fabricated, microfluidic sample containers. In contrast to our previous design,(More)
We present a rapid prototyping and a cost effective fabrication process on batch fabricated wafer-level micro inductive components with polymer magnetic composite (PMC) cores. The new PMC cores provide a possibility to bridge the gap between the non-magnetic and magnetic core inductive devices in terms of both the operating frequency and electrical(More)
This article describes the development and testing of the first automatically microfabricated probes to be used in conjunction with the magic angle coil spinning (MACS) NMR technique. NMR spectroscopy is a versatile technique for a large range of applications, but its intrinsically low sensitivity poses significant difficulties in analyzing mass- and(More)
We present a straightforward and yet, effective method to modulate the termination impedance of 1-D <inline-formula> <tex-math notation="LaTeX">$LC$ </tex-math></inline-formula> resonating arrays for wireless power applications. The modulation method is based on activating/deactivating the last two cells of the array allowing to remove the power nulls(More)
In the published paper [1], there are two errors in Table 5, both of which correspond to the reported results of a paper authored by Macrelli et al. in 2014 [48]. The correct value of the inductance per DC resistance of this paper is 73256 nH/Ω, and the correct value of the core volume is 4.32 mm 3. Therefore, Table 5 should read as follows: Table 5. Survey(More)
The goal of this paper is to provide a simple and effective optimization approach maximizing the output power of electromagnetic energy harvesters. The optimization is based on an equation enabling direct computation of the electromagnetic coupling. The output power is derived using only physical and geometrical parameters. Therefore, optimization can be(More)