TY  - JOUR
A1  - Prume, Klaus
A1  - Booij, W. E.
A1  - Vogl, A. H.
A1  - Wang, D. T.
T1  - A simple and powerful analytical model for MEMS piezoelectric multimorphs  / Booij, W. E. ; Vogl, A. H. ; Wang, D. T. ; Tyholdt, F. ; Ostbo, N. P. ; Raeder, H. ; Prume, K.
JF  - Journal of Electroceramics. 19 (2007), H. 4
Y1  - 2007
SN  - 1385-3449
SP  - 387
EP  - 393
ER  - 
TY  - JOUR
A1  - Prume, Klaus
T1  - Electrical and electromechanical characterization of piezoelectric thin films in view of MEMS application  /  Tiedke, S. ; Prume, K. ; Schmitz-Kempen, T.;
Y1  - 2007
N1  - ISAF 2007. Sixteenth IEEE International Symposium on  Applications of Ferroelectrics, 2007
SP  - 702
ER  - 
TY  - JOUR
A1  - Prochnow, Nora
A1  - Gebing, Tina
A1  - Ladage, Kerstin
A1  - Krause-Finkeldey, Dorothee
A1  - Ourdi, Abessamad El
A1  - Bitz, Andreas
A1  - Streckert, Joachim
A1  - Hansen, Volkert
A1  - Dermietzel, Rolf
T1  - Electromagnetic field effect or simply stress? Effects of UMTS exposure on hippocampal longterm plasticity in the context of procedure related hormone release
JF  - PLoS one
N2  - Harmful effects of electromagnetic fields (EMF) on cognitive and behavioural features of humans and rodents have been controversially discussed and raised persistent concern about adverse effects of EMF on general brain functions. In the present study we applied radio-frequency (RF) signals of the Universal Mobile Telecommunications System (UMTS) to full brain exposed male Wistar rats in order to elaborate putative influences on stress hormone release (corticosteron; CORT and adrenocorticotropic hormone; ACTH) and on hippocampal derived synaptic long-term plasticity (LTP) and depression (LTD) as electrophysiological hallmarks for memory storage and memory consolidation. Exposure was computer controlled providing blind conditions. Nominal brain-averaged specific absorption rates (SAR) as a measure of applied mass-related dissipated RF power were 0, 2, and 10 W/kg over a period of 120 min. Comparison of cage exposed animals revealed, regardless of EMF exposure, significantly increased CORT and ACTH levels which corresponded with generally decreased field potential slopes and amplitudes in hippocampal LTP and LTD. Animals following SAR exposure of 2 W/kg (averaged over the whole brain of 2.3 g tissue mass) did not differ from the sham-exposed group in LTP and LTD experiments. In contrast, a significant reduction in LTP and LTD was observed at the high power rate of SAR (10 W/kg). The results demonstrate that a rate of 2 W/kg displays no adverse impact on LTP and LTD, while 10 W/kg leads to significant effects on the electrophysiological parameters, which can be clearly distinguished from the stress derived background. Our findings suggest that UMTS exposure with SAR in the range of 2 W/kg is not harmful to critical markers for memory storage and memory consolidation, however, an influence of UMTS at high energy absorption rates (10 W/kg) cannot be excluded.
Y1  - 2011
U6  - https://doi.org/10.1371/journal.pone.0019437
VL  - 6
IS  - 5
PB  - PLOS
CY  - San Francisco
ER  - 
TY  - JOUR
A1  - Poppel, Kristin Isabel
A1  - Wolf, Martin R.
T1  - Möglichkeiten und Potentiale von Revisionsmarketing
JF  - Zeitschrift Interne Revision : ZIR ; Fachzeitschrift für Wissenschaft und Praxis
Y1  - 2013
SN  - 0044-3816
VL  - 48
IS  - 4
SP  - 200
EP  - 208
PB  - Erich Schmidt Verlag
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Pelikan, Erich
A1  - Scholl, Ingrid
T1  - Die Wavelet-Transformation. Pelikan, Erich; Scholl, Ingrid
JF  - Bildverarbeitung für die Medizin. Lehmann, T.; Oberschelp, W.; Pelikan, E.; Repges,R.
Y1  - 1997
SP  - 253
EP  - 282
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Oßmann, Martin
A1  - Kazay, B.
T1  - Simple circuit provides high-side current sensing / Ossmann, M ; Kazay, B.
JF  - EDN. 45 (2000), H. 21
Y1  - 2000
SN  - 0012-7515
SP  - 200
EP  - 200
ER  - 
TY  - JOUR
A1  - Oßmann, Martin
A1  - Kazay, B.
T1  - Single mu C pin makes half-duplex RS-232C / Ossmann, M
JF  - EDN. 44 (1999), H. 16
Y1  - 1999
SN  - 0012-7515
SP  - 118
ER  - 
TY  - JOUR
A1  - Oßmann, Martin
A1  - Hattrup, C.
A1  - Broeck, H. W. van der
T1  - Fast estimation techniques for digital control of resonant converters / Hattrup, C.; van der Broeck, H.W.; Ossmann, M.;
JF  - IEEE Transaction on Power Electronics. 18 (2003), H. 1
Y1  - 2003
SN  - 0885-8993
N1  - Part 2
SP  - 365
EP  - 372
ER  - 
TY  - JOUR
A1  - Orzada, Stephan
A1  - Solbach, Klaus
A1  - Gratz, Marcel
A1  - Brunheim, Sascha
A1  - Fiedler, Thomas M.
A1  - Johst, Sören
A1  - Bitz, Andreas
A1  - Shooshtary, Samaneh
A1  - Abuelhaija, Ashraf
A1  - Voelker, Maximilian N.
A1  - Rietsch, Stefan H. G.
A1  - Kraff, Oliver
A1  - Maderwald, Stefan
A1  - Flöser, Martina
A1  - Oehmingen, Mark
A1  - Quick, Harald H.
A1  - Ladd, Mark E.
T1  - A 32-channel parallel transmit system add-on for 7T MRI
JF  - Plos one
Y1  - 2019
U6  - https://doi.org/10.1371/journal.pone.0222452
ER  - 
TY  - JOUR
A1  - Orzada, Stephan
A1  - Maderwald, Stefan
A1  - Poser, Benedikt Andreas
A1  - Bitz, Andreas
A1  - Quick, Harald H.
A1  - Ladd, Mark E.
T1  - RF excitation using time interleaved acquisition of modes (TIAMO) to address B1 inhomogeneity in high-field MRI
JF  - Magnetic Resonance in Medicine
N2  - As the field strength and, therefore, the operational frequency in MRI is increased, the wavelength approaches the size of the human head/body, resulting in wave effects, which cause signal decreases and dropouts. Several multichannel approaches have been proposed to try to tackle these problems, including RF shimming, where each element in an array is driven by its own amplifier and modulated with a certain (constant) amplitude and phase relative to the other elements, and Transmit SENSE, where spatially tailored RF pulses are used. In this article, a relatively inexpensive and easy to use imaging scheme for 7 Tesla imaging is proposed to mitigate signal voids due to B1 field inhomogeneity. Two time-interleaved images are acquired using a different excitation mode for each. By forming virtual receive elements, both images are reconstructed together using GRAPPA to achieve a more homogeneous image, with only small SNR and SAR penalty in head and body imaging at 7 Tesla.
Y1  - 2010
U6  - https://doi.org/10.1002/mrm.22527
SN  - 1522-2594
VL  - 64
IS  - 2
SP  - 327
EP  - 333
PB  - Wiley-Liss
CY  - New York
ER  -