TY  - JOUR
A1  - Rietsch, Stefan H. G.
A1  - Pfaffenrot, Viktor
A1  - Bitz, Andreas
A1  - Orzada, Stephan
A1  - Brunheim, Sascha
A1  - Lazik-Palm, Andrea
A1  - Theysohn, Jens M.
A1  - Ladd, Mark E.
A1  - Quick, Harald H.
A1  - Kraff, Oliver
T1  - An 8-channel transceiver 7-channel receive RF coil setup for high SNR ultrahigh-field MRI of the shoulder at 7T
JF  - Medical Physics
Y1  - 2017
U6  - https://doi.org/10.1002/mp.12612
SN  - 0094-2405
IS  - Article in press
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Rietsch, Stefan H. G.
A1  - Brunheim, Sascha
A1  - Orzada, Stephan
A1  - Voelker, Maximilian N.
A1  - Maderwald, Stefan
A1  - Bitz, Andreas
A1  - Gratz, Marcel
A1  - Ladd, Mark E.
A1  - Quick, Harald H.
T1  - Development and evaluation of a 16-channel receive-only RF coil to improve 7T ultra-high field body MRI with focus on the spine
JF  - Magnetic Resonance in Medicine
Y1  - 2019
U6  - https://doi.org/10.1002/mrm.27731
SN  - 1522-2594
IS  - Early view
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Rens, Gavin
A1  - Varzinczak, Ivan
A1  - Meyer, Thomas
A1  - Ferrein, Alexander
T1  - A Logic for Reasoning about Actions and Explicit Observations
JF  - AI 2010: Advances in Artificial Intelligence 23rd Australasian Joint Conference, Adelaide, Australia, December 7-10, 2010. Proceedings
Y1  - 2010
SN  - 978-3-642-17431-5
N1  - Lecture Notes in Computer Science ; 6464
SP  - 395
EP  - 404
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Rens, Gavin
A1  - Ferrein, Alexander
T1  - Belief-node condensation for online POMDP algorithms
N2  - Slightly extended version of the paper accepted at the Robotics and Artificial Intelligence Workshop, a special track of IEEE AFRICON-2013, held in Mauritius, 9-12 September 2013
Y1  - 2013
SP  - 1
EP  - 7
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Reinhardt, T.
A1  - Bitz, Andreas
A1  - El Ouardi, A.
A1  - Streckert, J.
A1  - Sommer, A.
A1  - Lerchl, A.
A1  - Hansen, V.
T1  - Exposure set-ups for in vivo experiments using radial waveguides
JF  - Radiation Protection Dosimetry
Y1  - 2007
U6  - https://doi.org/10.1093/rpd/ncm370
SN  - 1742-3406
VL  - 124
IS  - 1
SP  - 21
EP  - 26
ER  - 
TY  - JOUR
A1  - Rausch, Lea
A1  - Friesen, John
A1  - Altherr, Lena
A1  - Meck, Marvin
A1  - Pelz, Peter F.
T1  - A holistic concept to design optimal water supply infrastructures for informal settlements using remote sensing data
JF  - Remote Sensing
N2  - Ensuring access to water and sanitation for all is Goal No. 6 of the 17 UN Sustainability Development Goals to transform our world. As one step towards this goal, we present an approach that leverages remote sensing data to plan optimal water supply networks for informal urban settlements. The concept focuses on slums within large urban areas, which are often characterized by a lack of an appropriate water supply. We apply methods of mathematical optimization aiming to find a network describing the optimal supply infrastructure. Hereby, we choose between different decentral and central approaches combining supply by motorized vehicles with supply by pipe systems. For the purposes of illustration, we apply the approach to two small slum clusters in Dhaka and Dar es Salaam. We show our optimization results, which represent the lowest cost water supply systems possible. Additionally, we compare the optimal solutions of the two clusters (also for varying input parameters, such as population densities and slum size development over time) and describe how the result of the optimization depends on the entered remote sensing data.
KW  - water supply design
KW  - mathematical optimization
KW  - slum classification
KW  - remote sensing
Y1  - 2018
SN  - 2072-4292
U6  - https://doi.org/10.3390/rs10020216
VL  - 10
IS  - 2
SP  - 1
EP  - 23
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Pöttgen, Philipp
A1  - Ederer, Thorsten
A1  - Altherr, Lena
A1  - Lorenz, Ulf
A1  - Pelz, Peter F.
T1  - Examination and optimization of a heating circuit for energy-efficient buildings
JF  - Energy Technology
N2  - The conference center darmstadtium in Darmstadt is a prominent example of energy efficient buildings. Its heating system consists of different source and consumer circuits connected by a Zortström reservoir. Our goal was to reduce the energy costs of the system as much as possible. Therefore, we analyzed its supply circuits. The first step towards optimization is a complete examination of the system: 1) Compilation of an object list for the system, 2) collection of the characteristic curves of the components, and 3) measurement of the load profiles of the heat and volume-flow demand. Instead of modifying the system manually and testing the solution by simulation, the second step was the creation of a global optimization program. The objective was to minimize the total energy costs for one year. We compare two different topologies and show opportunities for significant savings.
KW  - energy transfer
KW  - heating system
KW  - programming
KW  - system optimization
KW  - technical operations research
Y1  - 2015
SN  - 2194-4296
U6  - https://doi.org/10.1002/ente.201500252
VL  - 4
IS  - 1
SP  - 136
EP  - 144
PB  - WILEY-VCH Verlag
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Zalachas, Nicolas
A1  - Laskewitz, Bernd
A1  - Kamlah, Marc
T1  - Effective Piezoelectric Coefficients of Ferroelectric Thin Films on Elastic Substrates / Zalachas, Nicolas ; Laskewitz, Bernd ; Kamlah, Marc ; Prume, Klaus ; Lapusta, Yuri ; Tiedke, Stephan
JF  - Journal of Intelligent Material Systems and Structures. 20 (2008), H. 6
Y1  - 2008
SN  - 1045-389X
SP  - 683
EP  - 695
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Waser, Rainer
A1  - Franken, Klaus
A1  - Maier, Horst R.
T1  - Finite-Element Analysis of Ceramic Multilayer Capacitors: Modeling and Electrical Impedance Spectroscopy for a Nondestructive Failure Test / Prume, Klaus ; Waser, Rainer ; Franken, Klaus ; Maier, Horst R. ;
JF  - Journal of the American Ceramic Society. 83 (2000), H. 5
Y1  - 2000
SN  - 0002-7820
SP  - 1153
EP  - 1159
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Waser, Rainer
T1  - Finite-element simulation of coupled characteristics of ceramic multilayer capacitors under transient electrical loading / Prume, Klaus ; Waser, Rainer
JF  - Proceedings of the 2000 12th IEEE International Symposium on  Applications of Ferroelectrics. Vol. 2
Y1  - 2000
N1  - ISAF 2000. Proceedings of the 2000 12th IEEE International Symposium on  Applications of Ferroelectrics
SP  - 675
EP  - 678
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Tyholdt, F.
A1  - Calame, F.
A1  - Raeder, H.
T1  - Chemically derived seeding layer for {100}-textured PZT thin films   / Tyholdt, F. ; Calame, F. ; Prume, K. ; Raeder, H. ; Muralt, P.
JF  - Journal of Electroceramics. 19 (2007), H. 4
Y1  - 2007
SN  - 1385-3449
SP  - 311
EP  - 314
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Tiedke, S.
A1  - Schmitz, T.
A1  - Roelofs, A.
T1  - Direct hysteresis measurements of single nanosized ferroelectric capacitors contacted with an atomic force microscope / Tiedke, S. ; Schmitz, T. ; Prume, K. ; Roelofs, A. ; Schneller, T. ; Kall, U. ; Waser, R. ; Ganpule, C. S. ; Nagarajan, V. ; Stanishevs
JF  - Applied Physics Letters. 79 (2001), H. 22
Y1  - 2001
SN  - 0003-6951
SP  - 3678
EP  - 3680
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Roelofs, Andreas
A1  - Schmitz, Thorsten
A1  - Reichenberg, Bernd
T1  - Compensation of the Parasitic Capacitance of a Scanning Force Microscope Cantilever Used for Measurements on Ferroelectric Capacitors of Submicron Size by Means of Finite Element Simulations / Prume, Klaus ; Roelofs, Andreas ; Schmitz, Thorsten ; Reichenb
JF  - Japanese Journal of Applied Physics. 41 (2002), H. 11B
Y1  - 2002
SN  - 0021-4922
SP  - 7198
EP  - 7201
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Reichenberg, B.
A1  - Roelofs, A.
A1  - Waser, R.
T1  - In-situ compensation of the parasitic capacitance for nanoscale hysteresis measurements  / Schmitz, T. ; Prume, K. ; Reichenberg, B. ; Roelofs, A. ; Waser, R. ; Tiedke, S.
JF  - Journal of the European Ceramic Society. 24 (2004), H. 6
Y1  - 2004
SN  - 0955-2219
N1  - Electroceramics VIII
SP  - 1145
EP  - 1147
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Raeder, H.
A1  - Tyholdt, F.
A1  - Booij, W. E.
T1  - Taking piezoelectric microsystems from the laboratory to production  / Raeder, H. ; Tyholdt, F. ; Booij, W. ; Calame, F. ; Ostbo, N. P. ; Bredesen, R. ; Prume, K. ; Rijnders, G. ; Muralt, P.
JF  - Journal of Electroceramics. 19 (2007), H. 4
Y1  - 2007
SN  - 1385-3449
SP  - 357
EP  - 362
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Peter, F.
A1  - Rüdiger, A.
A1  - Dittmann, R.
T1  - Analysis of shape effects on the piezoresponse in ferroelectric nanograins with and without adsorbates / Peter, F. ; Rüdiger, A. ; Dittmann, R. ; Waser, R. ; Szot, K. ; Reichenberg, B. ; Prume, K. ;
JF  - Applied Physics Letters  . 87 (2005), H. 8
Y1  - 2005
SN  - 0003-6951
SP  - 082901
EP  - 082901-3
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Muralt, Paul
A1  - Calame, Florian
A1  - Schmitz-Kempen, Thorsten
T1  - Extensive electromechanical characterization of PZT thin films for MEMS applications by electrical and mechanical excitation signals / Prume, Klaus ; Muralt, Paul ; Calame, Florian ; Schmitz-Kempen, Thorsten ; Tiedke, Stephan
JF  - Journal of Electroceramics. 19 (2007), H. 4
Y1  - 2007
SN  - 1385-3449
SP  - 407
EP  - 411
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Muralt, P.
A1  - Calame, F.
A1  - Schmitz-Kempen, T.
T1  - Piezoelectric thin films: evaluation of electrical and electromechanical characteristics for MEMS devices  / Prume, K. ; Muralt, P. ; Calame, F. ; Schmitz-Kempen, T. ; Tiedke, S. ;
JF  - IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 54 (2007), H. 1
Y1  - 2007
SN  - 0885-3010
SP  - 81
EP  - 14
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Meyer, René
A1  - Waser, Rainer
A1  - Schmitz, Torsten
T1  - Dynamic leakage current compensation in ferroelectric thin-film capacitor structures / Meyer, René ; Waser, Rainer ; Prume, Klaus ; Schmitz, Torsten ; Tiedke, Stephan
JF  - Applied Physics Letters . 86 (2005), H. 14
Y1  - 2005
SN  - 0003-6951
SP  - 142907-1
EP  - 142907-3
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Gerber, Peter
A1  - Kügeler, Carsten
A1  - Roelofs, Andreas
T1  - Simulation and measurements of the piezoelectric properties response (d33) of piezoelectric layered thin film structures influenced by the top-electrode size  / Prume, K. ; Gerber, P. ; Kügeler, C. ; Roelofs, A. ; Böttger, U. ; Waser, R. ; Schmitz-Kempen,
Y1  - 2004
SN  - 0-7803-8410-5
N1  - 14th IEEE International Symposium on  Applications of Ferroelectrics, 2004. ISAF-04. 2004
SP  - 7
EP  - 10
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Gerber, P.
A1  - Roelofs, A.
A1  - Kügeler, C.
T1  - Effects of the top-electrode size on the piezoelectric properties (d33 and S) of lead zirconate titanate thin films / Gerber, P. ; Roelofs, A. ; Kügeler, C.;  Böttger, U. ; Waser, R. ; Prume, K. ;
JF  - Journal of Applied Physics  . 96 (2004), H. 5
Y1  - 2004
SN  - 0021-8979
SP  - 2800
EP  - 2804
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Franken, Klaus
A1  - Maier, Horst R.
A1  - Waser, Rainer
T1  - Finite-Element Analysis of Ceramic Multilayer Capacitors: Failure Probability Caused by Wave Soldering and Bending Loads / Franken, Klaus ; Maier, Horst R. ; Prume, Klaus ; Waser, Rainer
JF  - Journal of the American Ceramic Society. 83 (2000), H. 6
Y1  - 2000
SN  - 0002-7820
SP  - 1433
EP  - 1440
ER  - 
TY  - JOUR
A1  - Prume, Klaus
A1  - Franken, Klaus
A1  - Böttger, Ulrich
A1  - Waser, Rainer
T1  - Modelling and numerical simulation of the electrical, mechanical, and thermal coupled behaviour of Multilayer capacitors (MLCs) / Prume, Klaus ; Franken, Klaus ; Böttger, Ulrich ; Waser, Rainer ; Maier, Horst R.
JF  - Journal of the European Ceramic Society. 22 (2002), H. 8
Y1  - 2002
SN  - 0955-2219
SP  - 1285
EP  - 1296
ER  - 
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
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, Asjraf
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  - 
TY  - JOUR
A1  - Orzada, Stephan
A1  - Ladd, Mark E.
A1  - Bitz, Andreas
T1  - A method to approximate maximum local SAR in multichannel transmit MR systems without transmit phase information
JF  - Magnetic Resonance in Medicine
N2  - Purpose
To calculate local specific absorption rate (SAR) correctly, both the amplitude and phase of the signal in each transmit channel have to be known. In this work, we propose a method to derive a conservative upper bound for the local SAR, with a reasonable safety margin without knowledge of the transmit phases of the channels.

Methods
The proposed method uses virtual observation points (VOPs). Correction factors are calculated for each set of VOPs that prevent underestimation of local SAR when the VOPs are applied with the correct amplitudes but fixed phases.

Results
The proposed method proved to be superior to the worst-case calculation based on the maximum eigenvalue of the VOPs. The mean overestimation for six coil setups could be reduced, whereas no underestimation of the maximum local SAR occurred. In the best investigated case, the overestimation could be reduced from a factor of 3.3 to a factor of 1.7.

Conclusion
The upper bound for the local SAR calculated with the proposed method allows a fast estimation of the local SAR based on power measurements in the transmit channels and facilitates SAR monitoring in systems that do not have the capability to monitor transmit phases
Y1  - 2016
U6  - https://doi.org/10.1002/mrm.26398
SN  - 1522-2594
VL  - 78
IS  - 2
SP  - 805
EP  - 811
PB  - International Society for Magnetic Resonance in Medicine
ER  - 
TY  - JOUR
A1  - Orzada, Stephan
A1  - Johst, Sören
A1  - Maderwald, Stefan
A1  - Bitz, Andreas
A1  - Solbach, Klaus
A1  - Ladd, Mark E.
T1  - Mitigation of B1(+) inhomogeneity on single-channel transmit systems with TIAMO
JF  - Magnetic Resonance in Medicine
Y1  - 2013
U6  - https://doi.org/10.1002/mrm.24453
SN  - 1522-2594
VL  - 70
IS  - 1
SP  - 290
EP  - 294
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Orzada, Stephan
A1  - Fiedler, Thomas M.
A1  - Bitz, Andreas
A1  - Ladd, Mark E.
A1  - Quick, Harald H.
T1  - Local SAR compression with overestimation control to reduce maximum relative SAR overestimation and improve multi-channel RF array performance
JF  - Magnetic Resonance Materials in Physics, Biology and Medicine
N2  - Objective
In local SAR compression algorithms, the overestimation is generally not linearly dependent on actual local SAR. This can lead to large relative overestimation at low actual SAR values, unnecessarily constraining transmit array performance.

Method
Two strategies are proposed to reduce maximum relative overestimation for a given number of VOPs. The first strategy uses an overestimation matrix that roughly approximates actual local SAR; the second strategy uses a small set of pre-calculated VOPs as the overestimation term for the compression.

Result
Comparison with a previous method shows that for a given maximum relative overestimation the number of VOPs can be reduced by around 20% at the cost of a higher absolute overestimation at high actual local SAR values.

Conclusion
The proposed strategies outperform a previously published strategy and can improve the SAR compression where maximum relative overestimation constrains the performance of parallel transmission.
Y1  - 2020
SN  - 1352-8661
U6  - https://doi.org/10.1007/s10334-020-00890-0
IS  - 34 (2021)
SP  - 153
EP  - 164
PB  - Springer
CY  - Heidelberg
ER  - 
TY  - JOUR
A1  - Orzada, Stephan
A1  - Bitz, Andreas
A1  - Schäfer, Lena C.
A1  - Ladd, Susanne C.
A1  - Ladd, Mark E.
A1  - Maderwald, Stefan
T1  - Open design eight-channel transmit/receive coil for high-resolution and real-time ankle imaging at 7 T
JF  - Medical Physics
N2  - Purpose:
At 1.5 T, real-time MRI of joint movement has been shown to be feasible. However, 7 T, provides higher SNR and thus an improved potential for parallel imaging acceleration. The purpose of this work was to build an open, U-shaped eight-channel transmit/receive microstrip coil for 7 T MRI to enable high-resolution and real-time imaging of the moving ankle joint.

Methods:
A U-shaped eight-channel transmit/receive array for the human ankle was built.urn:x-wiley:00942405:mp3399:equation:mp3399-math-0001-parameters and urn:x-wiley:00942405:mp3399:equation:mp3399-math-0002-factor were measured. SAR calculations of different ankle postures were performed to ensure patient safety. Inhomogeneities in the transmit field consequent to the open design were compensated for by the use of static RF shimming. High-resolution and real-time imaging was performed in human volunteers.

Results:
The presented array showed good performance with regard to patient comfort and image quality. High acceleration factors of up to 4 are feasible without visible acceleration artifacts. Reasonable image homogeneity was achieved with RF shimming.

Conclusions:
Open, noncylindrical designs for transmit/receive coils are practical at 7 T and real-time imaging of the moving joint is feasible with the presented coil design.
Y1  - 2011
U6  - https://doi.org/10.1118/1.3553399
SN  - 2473-4209
VL  - 38
IS  - 3
SP  - 1162
EP  - 1167
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Orzada, Stephan
A1  - Bitz, Andreas
A1  - Johst, Sören
A1  - Gratz, Marcel
A1  - Völker, Maximilian N.
A1  - Kraff, Oliver
A1  - Abuelhaija, Ashraf
A1  - Fiedler, Thomas M.
A1  - Solbach, Klaus
A1  - Quick, Harald H.
A1  - Ladd, Mark E.
T1  - Analysis of an integrated 8-Channel Tx/Rx body array for use as a body coil in 7-Tesla MRI
JF  - Frontiers in Physics
Y1  - 2017
U6  - https://doi.org/10.3389/fphy.2017.00017
SN  - 2296-424X
N1  - Article number 17
VL  - 5
IS  - Jun
ER  - 
TY  - JOUR
A1  - Orzada, S.
A1  - Maderwald, S.
A1  - Poser, B. A.
A1  - Johst, S.
A1  - Kannengiesser, S.
A1  - Ladd, M. E.
A1  - Bitz, Andreas
T1  - Time-interleaved acquisition of modes: an analysis of SAR and image contrast implications
JF  - Magnetic Resonance in Medicine
N2  - s the magnetic field strength and therefore the operational frequency in MRI are increased, the radiofrequency wavelength approaches the size of the human head/body, resulting in wave effects which cause signal decreases and dropouts. Especially, whole-body imaging at 7 T and higher is therefore challenging. Recently, an acquisition scheme called time-interleaved acquisition of modes has been proposed to tackle the inhomogeneity problems in high-field MRI. The basic premise is to excite two (or more) different Burn:x-wiley:07403194:media:MRM23081:tex2gif-stack-1 modes using static radiofrequency shimming in an interleaved acquisition, where the complementary radiofrequency patterns of the two modes can be exploited to improve overall signal homogeneity. In this work, the impact of time-interleaved acquisition of mode on image contrast as well as on time-averaged specific absorption rate is addressed in detail. Time-interleaved acquisition of mode is superior in Burn:x-wiley:07403194:media:MRM23081:tex2gif-stack-2 homogeneity compared with conventional radiofrequency shimming while being highly specific absorption rate efficient. Time-interleaved acquisition of modes can enable almost homogeneous high-field imaging throughout the entire field of view in PD, T2, and T2*-weighted imaging and, if a specified homogeneity criterion is met, in T1-weighted imaging as well.
Y1  - 2012
U6  - https://doi.org/10.1002/mrm.23081
SN  - 1522-2594
VL  - 67
IS  - 4
SP  - 1033
EP  - 1041
PB  - Wiley-Liss
CY  - New York
ER  - 
TY  - JOUR
A1  - Noureddine, Yacine
A1  - Kraff, Oliver
A1  - Ladd, Mark E.
A1  - Wrede, Karsten H.
A1  - Chen, Bixia
A1  - Quick, Harald H.
A1  - Schaefers, Gregor
A1  - Bitz, Andreas
T1  - In vitro and in silico assessment of RF-induced heating around intracranial aneurysm clips at 7 Tesla
JF  - Magnetic Resonance in Medicine
Y1  - 2017
U6  - https://doi.org/10.1002/mrm.26650
SN  - 1522-2594
IS  - Early view
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Noureddine, Yacine
A1  - Kraff, Oliver
A1  - Ladd, Mark E.
A1  - Wrede, Karsten
A1  - Chen, Bixia
A1  - Quick, Harald H.
A1  - Schaefers, Georg
A1  - Bitz, Andreas
T1  - Radiofrequency induced heating around aneurysm clips using a generic birdcage head coil at 7 Tesla under consideration of the minimum distance to decouple multiple aneurysm clips
JF  - Magnetic Resonance in Medicine
Y1  - 2019
U6  - https://doi.org/10.1002/mrm.27835
SN  - 1522-2594
IS  - Early view
SP  - 1
EP  - 17
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Noureddine, Yacine
A1  - Bitz, Andreas
A1  - Ladd, Mark E.
A1  - Thürling, Markus
A1  - Ladd, Susanne C.
A1  - Schaefers, Gregor
A1  - Kraff, Oliver
T1  - Experience with magnetic resonance imaging of human subjects with passive implants and tattoos at 7 T: a retrospective study
JF  - Magnetic Resonance Materials in Physics, Biology and Medicine
Y1  - 2015
U6  - https://doi.org/10.1007/s10334-015-0499-y
SN  - 1352-8661
VL  - 28
IS  - 6
SP  - 577
EP  - 590
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Niemüller, Tim
A1  - Lakemeyer, Gerhard
A1  - Ferrein, Alexander
A1  - Reuter, S.
A1  - Ewert, D.
A1  - Jeschke, S.
A1  - Pensky, D.
A1  - Karras, Ulrich
T1  - Proposal for advancements to the LLSF in 2014 and beyond
Y1  - 2013
SP  - Publ. online
ER  - 
TY  - JOUR
A1  - Niemüller, Tim
A1  - Ferrein, Alexander
A1  - Lakemeyer, Gerhard
T1  - A Lua-based Behavior Engine for Controlling the Humanoid Robot Nao
JF  - RoboCup 2009: Robot Soccer World Cup XIII
Y1  - 2010
N1  - Lecture Notes in Computer Science ; 5949
SP  - 240
EP  - 251
ER  - 
TY  - JOUR
A1  - Niemüller, Tim
A1  - Ferrein, Alexander
A1  - Eckel, Gerhard
A1  - Pirro, David
A1  - Podbregar, Patrick
A1  - Kellner, Tobias
A1  - Rath, Christoph
A1  - Steinbauer, Gerald
T1  - Providing Ground-truth Data for the Nao Robot Platform
JF  - RoboCup 2010: Robot Soccer World Cup XIV
Y1  - 2011
SN  - 978-3-642-20217-9
N1  - Lecture Notes in Computer Science ; 6556
SP  - 133
EP  - 144
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Niemüller, Tim
A1  - Ferrein, Alexander
A1  - Beck, Daniel
A1  - Lakemeyer, Gerhard
T1  - Design Principles of the Component-Based Robot Software Framework Fawkes
JF  - Simulation, Modeling, and Programming for Autonomous Robots
Y1  - 2010
N1  - Lecture Notes in Computer Science ; 6472 ; Second International Conference, SIMPAR 2010, Darmstadt, Germany, November 15-18, 2010. Proceedings
SP  - 300
EP  - 311
ER  - 
TY  - JOUR
A1  - Niemueller, Tim
A1  - Karras, Ulrich
A1  - Ferrein, Alexander
T1  - Meisterschaft der Maschinen: Die Industrial Logistic Liga
JF  - C´t Magazin für Computertechnik
Y1  - 2017
IS  - 26
ER  - 
TY  - JOUR
A1  - Ndoumbè Mbonjo Mbonjo, H.
A1  - Streckert, J.
A1  - Bitz, Andreas
A1  - Hansen, V.
A1  - Glasmachers, A.
A1  - Gencol, S.
A1  - Rozic, D.
T1  - Generic UMTS test signal for RF bioelectromagnetic studies
JF  - Bioelectromagnetics
Y1  - 2004
U6  - https://doi.org/10.1002/bem.20007
SN  - 1521-186X
VL  - 25
IS  - 6
SP  - 415
EP  - 425
ER  - 
TY  - JOUR
A1  - Müller, Tim M.
A1  - Leise, Philipp
A1  - Lorenz, Imke-Sophie
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Optimization and validation of pumping system design and operation for water supply in high-rise buildings
JF  - Optimization and Engineering
N2  - The application of mathematical optimization methods for water supply system design and operation provides the capacity to increase the energy efficiency and to lower the investment costs considerably. We present a system approach for the optimal design and operation of pumping systems in real-world high-rise buildings that is based on the usage of mixed-integer nonlinear and mixed-integer linear modeling approaches. In addition, we consider different booster station topologies, i.e. parallel and series-parallel central booster stations as well as decentral booster stations. To confirm the validity of the underlying optimization models with real-world system behavior, we additionally present validation results based on experiments conducted on a modularly constructed pumping test rig. Within the models we consider layout and control decisions for different load scenarios, leading to a Deterministic Equivalent of a two-stage stochastic optimization program. We use a piecewise linearization as well as a piecewise relaxation of the pumps’ characteristics to derive mixed-integer linear models. Besides the solution with off-the-shelf solvers, we present a problem specific exact solving algorithm to improve the computation time. Focusing on the efficient exploration of the solution space, we divide the problem into smaller subproblems, which partly can be cut off in the solution process. Furthermore, we discuss the performance and applicability of the solution approaches for real buildings and analyze the technical aspects of the solutions from an engineer’s point of view, keeping in mind the economically important trade-off between investment and operation costs.
KW  - Technical Operations Research
KW  - MINLP
KW  - MILP
KW  - Experimental validation
KW  - Pumping systems
Y1  - 2020
U6  - https://doi.org/10.1007/s11081-020-09553-4
SN  - 1573-2924
VL  - 2021
IS  - 22
SP  - 643
EP  - 686
PB  - Springer
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Schwarz, Michael
T1  - Pegel- und Dämpfungsmessung an Wellenlängenmultiplex-Systemen und -Komponenten
JF  - Nachrichtentechnische Zeitschrift. 46 (1993), H. 1
Y1  - 1993
SN  - 0027-707X
SP  - 36
EP  - 38
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Obolenski, B.
T1  - Webware mit elektromagnetischer Schirmwirkung
JF  - Melliand-Textilberichte. 85 (2004), H. 5
Y1  - 2004
SN  - 0341-0781
SP  - 348
EP  - 349
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Obolenski, B.
T1  - Textilien und elektromagnetische Strahlung
JF  - Melliand-Textilberichte. 85 (2004), H. 3
Y1  - 2004
SN  - 0341-0781
SP  - 190
EP  - 192
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Obolenski, B.
T1  - Elektromagnetisch schirmende Wirk- und Strickwaren
JF  - Melliand-Textilberichte. 85 (2004), H. 7-8
Y1  - 2004
SN  - 0341-0781
SP  - 587
EP  - 588
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Kraus, E.
A1  - Peifer, Hermann-Josef
A1  - Obolenski, B.
T1  - Bekleidungstextilien mit elektromagnetischer Schirmwirkung
JF  - Technische Textilien. 48 (2005), H. 2
Y1  - 2005
SN  - 0323-3243
SP  - 160
EP  - 163
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Binnebösel, Marcel
A1  - Klinge, Uwe
A1  - Goedderz, Thomas
T1  - New objective measurement to characterize the porosity of textile implants
JF  - Journal of Biomedical Materials Research Part B: Applied Biomaterials. 84B (2008), H. 1
Y1  - 2008
SN  - 1552-4981
SP  - 176
EP  - 183
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
T1  - Berechnung von Lichtintensitätsverteilungen in streuenden Medien
Y1  - 1988
N1  - Aachen, Techn. Hochsch., Diss., 1988
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
A1  - Fuchs, Britta
T1  - Der neue Studiengang Communication and Multimediadesign beginnt
JF  - Fachhochschule <Aachen>: Fachblatt. 2003 (2003), H. 2
Y1  - 2003
SP  - 11
EP  - 11
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Danach ging das Leben weiter : Macht und Gewalt im Geschlechterkampf bei Günter Grass. Mayer-Iswandy, Claudia
JF  - Alte Welten - neue Welten : Akten des IX. Kongresses der Internationalen Vereinigung für germanische Sprach- und Literaturwissenschaft (IVG) ; [Akten des IX. Internationalen Germanisten-Kongresses, Vancouver 1995] / hrsg. von Michael S. Batts. Bd. 2: Abstracts
Y1  - 1996
SN  - 3-484-10716-2
N1  - Internationaler Germanisten-Kongress <Internationale Vereinigung für Germanische Sprach- und Literaturwissenschaft, 9, 1995, Vancouver, British Columbia>
SP  - 37
PB  - Niemeyer
CY  - Tübingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Jenseits der Grenze. Asien im Werk von Günter Grass. Claudia Mayer-Iswandy
JF  - Ich will in das Herz Kalkuttas eindringen. Günter Grass in Indien und Bagladesch. Hrsg. von Martin Kämpchen.
Y1  - 2005
SN  - 3-86142-314-6
SP  - 159
EP  - 180
PB  - Ed. Isele
CY  - Eggingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Eine Fundgrube für wahre Schätze. Das Archiv der German Society of Pennsylvania
JF  - Der neue Pennsylvanische Staatsbote (1999)
Y1  - 1999
SP  - 4
EP  - und 8
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Germanistik [Lexikoneintrag]
JF  - Modern Germany : an encyclopedia of history, people, and culture, 1871 - 1990 / ed.: Dieter K. Buse; Jürgen C. Doerr
Y1  - 1998
SN  - 0-8153-0503-6
SP  - 404
EP  - 407
PB  - Garland
CY  - New York
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - L'Estétique et le pouvoir: Le discours chaotique de l'Allemagne unifiée
JF  - Canadian review of comparative literature : CRCL = Revue canadienne de littérature comparée : RCLC / Canadian Comparative Literature Association. 24 (1997), H. 2
Y1  - 1997
SN  - 0319-051X
SP  - 297
EP  - 317
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Von »Unterbrechungen« und »Engführungen«. Lyrik und Prosa in Butt und Rättin
JF  - Günter Grass
Y1  - 1997
SN  - 3-88377-564-9
N1  - Text + Kritik ; 1
SP  - 86
EP  - 94
PB  - Ed. Text + Kritik
CY  - München
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Zum Verhältnis von Macht und Gewalt im Geschlechterkampf. Systemtheoretische Überlegungen zu Günter Grass und Ulla Hahn
JF  - Zeitschrift für Germanistik : G. 7 (1997), H. 2
Y1  - 1997
SN  - 0323-7982
SP  - 303
EP  - 320
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Ästhetik und Macht. Zur diskursiven Unordnung im vereinten Deutschland
JF  - German studies review. 19 (1996), H. 3
Y1  - 1996
SN  - 0149-7952
SP  - 501
EP  - 523
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Between Trans- and Interdisciplinarity. »Germanistik« and the Dialectic of Inclusion and Exclusion of the Other(s)
JF  - Language and literature today : proceedings of the XIXth triennal congress of the International Federation for Modern Languages and Literatures ; Brasília 22 - 30 August 1993. General ed. Neide de Faria.
Y1  - 1993
SN  - 85-230-0405-x
N1  - Band 2
SP  - 958
EP  - 966
PB  - Univ.
CY  - Brasilia
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Between Resistance and Affirmation: Christa Wolf and German Unification
JF  - Canadian review of comparative literature : CRCL = Revue canadienne de littérature comparée / Canadian Comparative Literature Association. 22 (1995), H. 3-4
Y1  - 1995
SN  - 0319-051X
SP  - 813
EP  - 835
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Weiße Schimmel gibt's nicht mehr. Zum Problem der literarischen Ästhetik
JF  - Zwischen Traum und Trauma - die Nation : transatlantische Perspektiven zur Geschichte eines Problems / Claudia Mayer-Iswandy (Hrsg.)
Y1  - 1994
SN  - 3-86057-132-X
N1  - Stauffenburg-Colloquium ; 32
SP  - 85
EP  - 97
PB  - Stauffenburg-Verl.
CY  - Tübingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Wie national ist die Germanistik? Die Scheu der Literaturwissenschaft vor der eigenen Vergangenheit
JF  - Frankfurter Rundschau. 159 (1993), H. 13.07.1993
Y1  - 1993
SP  - 14
EP  - 14
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Zwischen Traum und Trauma: Einführende Bemerkungen zum »Komplex Nation«
JF  - Zwischen Traum und Trauma - die Nation : transatlantische Perspektiven zur Geschichte eines Problems / Claudia Mayer-Iswandy (Hrsg.)
Y1  - 1994
SN  - 3-86057-132-X
N1  - Stauffenburg-Colloquium ; 32
SP  - 13
EP  - 24
PB  - Stauffenburg-Verl.
CY  - Tübingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Frauen und Revolution: Der weibliche Anteil an der Geschichte. Christa Wolf und das Ende der DDR
JF  - Women in German Newsletter. 56 (1991)
Y1  - 1991
N1  - (gesehen am 03.04.2007)
SP  - 29
EP  - 30
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Auf dem Holzweg zur Wasserstelle. Ökologischer Tourismus auf der Karibik-Insel St. John
JF  - Frankfurter Rundschau. 81 (1992), H. 14
Y1  - 1992
N1  - 4.4.1992
SP  - M5
EP  - M5
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Aspekte der Wiedervereinigung in der aktuellen deutschen Literatur.
JF  - Forum Deutsch : Informationen, Meinungen, Materialien und Tips für kanadische Deutschlehrer / Ständige Konferenz kanadischer Deutschlehrer (1991)
Y1  - 1991
SP  - 16
EP  - 22
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Das Ich ist eine Illusion
JF  - Deutsches Allgemeines Sonntagsblatt (1990)
Y1  - 1990
N1  - "Gott und die Welt"
SP  - 16
EP  - 16
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Bali. Blüteninsel im Indischen Ozean. Reisebericht
JF  - Fliegende Blätter / Condor (1990)
Y1  - 1990
N1  - Condor-Flugdienst <Frankfurt, Main>
SP  - 61
EP  - 64
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Elf Tage Schweigen. Bericht zu Buddhismus und Meditation in Thailand
JF  - Frankfurter Allgemeine Zeitung (1989)
Y1  - 1989
SP  - R5
EP  - R6
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Von »Unterbrechungen« und »Engführungen«. Lyrik und Prosa in Butt und Rättin
JF  - Günter Grass
Y1  - 1988
SN  - 3-88377-285-2
N1  - 6. Aufl.: Neufassung
SP  - 84
EP  - 92
PB  - Ed. Text + Kritik
CY  - München
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Versuche einer Rebellion. Zur Anpassung des Körpers an den Geist
JF  - Verleiblichungen : literatur- und kulturgeschichtliche Studien über Strategien, Formen und Funktionen der Verleiblichung in Texten von der Frühzeit bis zum Cyberspace / Burkhardt Krause ... (Hrsg.)
Y1  - 1996
SN  - 3-86110-089-4
N1  - Mannheimer Studien zur Literatur- und Kulturwissenschaft ; 7
SP  - 219
EP  - 246
PB  - Röhrig-Univ.-Verl.
CY  - St. Ingbert
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - MBA-Studiengang "Entrepreneurship" in Düren bald auch mit Qualitätssiegel
JF  - Fachhochschule <Aachen>: Fachblatt. 2003 (2003), H. 2
Y1  - 2003
SN  - 1430-7707
SP  - 10
EP  - 10
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Internet statt Zeitung? Nein, Internet und Zeitung!
JF  - Aachener Zeitung. 08.01.2007 (2007)
Y1  - 2007
N1  - Zukunft der Medien
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Die Lebensbeichte des Günter Grass
JF  - Aachener Zeitung. 28.12.2006 (2006)
Y1  - 2006
N1  - Telegramme
SP  - 8
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Die Beichte eines Mahners an seinem Lebensabend.  Das späte Bekenntnis des Günter Grass. Analysierende Rückschau auf sein SS-Eingeständnis
JF  - Aachener Nachrichten. 28.12.2006 (2006)
Y1  - 2006
SP  - 8
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Meine besten Rezepte
JF  - Kinder, Karriere, Kochvergnügen : Prominente Aachenerinnen verraten ihre besten Rezepte / Hrsg. von Claudia Dechamps . Fotos: Harald Krömer
Y1  - 2008
SP  - 30
EP  - 33
PB  - Corporate Publishing Claudia Dechamps
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Maus, Stefan
A1  - Höfken, Hans-Wilhelm
A1  - Schuba, Marko
T1  - Forensic Analysis of Geodata in Android Smartphones
Y1  - 2011
N1  - Cyberforensics 2011, Glasgow
SP  - 1
EP  - 11
ER  - 
TY  - JOUR
A1  - Martin, Conrad
A1  - Frauenrath, Tobias
A1  - Özerdem, Celal
A1  - Renz, Wolfgang
A1  - Niendorf, Thoralf
T1  - Development and evaluation of a small and mobile Magneto Alert Sensor (MALSE) to support safety requirements for magnetic resonance imaging
JF  - European Radiology
N2  - Objective
The purpose of this study is to (i) design a small and mobile Magnetic field ALert SEnsor (MALSE), (ii) to carefully evaluate its sensors to their consistency of activation/deactivation and sensitivity to magnetic fields, and (iii) to demonstrate the applicability of MALSE in 1.5 T, 3.0 T and 7.0 T MR fringe field environments.

Methods
MALSE comprises a set of reed sensors, which activate in response to their exposure to a magnetic field. The activation/deactivation of reed sensors was examined by moving them in/out of the fringe field generated by 7TMR.

Results
The consistency with which individual reed sensors would activate at the same field strength was found to be 100% for the setup used. All of the reed switches investigated required a substantial drop in ambient magnetic field strength before they deactivated.

Conclusions
MALSE is a simple concept for alerting MRI staff to a ferromagnetic object being brought into fringe magnetic fields which exceeds MALSEs activation magnetic field. MALSE can easily be attached to ferromagnetic objects within the vicinity of a scanner, thus creating a barrier for hazardous situations induced by ferromagnetic parts which should not enter the vicinity of an MR-system to occur.
KW  - MRI
KW  - MR safety
KW  - Magneto alert sensor
KW  - High field MRI
KW  - Uktrahigh field MRI
Y1  - 2011
U6  - https://doi.org/10.1007/s00330-011-2153-z
SN  - 1432-1084
VL  - 21
SP  - 2187
EP  - 2192
PB  - Springer
CY  - Berlin, Heidelberg
ER  - 
TY  - JOUR
A1  - Maas, Marnix C.
A1  - Vos, Eline K.
A1  - Lagemaat, Miriam W.
A1  - Bitz, Andreas
A1  - Orzada, Stephan
A1  - Kobus, Thiele
A1  - Kraff, Oliver
A1  - Maderwald, Stefan
A1  - Ladd, Mark E.
A1  - Scheenen, Tom W. J.
T1  - Feasibility of T₂-weighted turbo spin echo imaging of the human prostate at 7 tesla
JF  - Magnetic Resonance in Medicine
N2  - Purpose
To demonstrate that high quality T₂-weighted (T2w) turbo spin-echo (TSE) imaging of the complete prostate can be achieved routinely and within safety limits at 7 T, using an external transceive body array coil only.

Methods
Nine healthy volunteers and 12 prostate cancer patients were scanned on a 7 T whole-body system. Preparation consisted of B₀ and radiofrequency shimming and localized flip angle calibration. T₁ and T₂ relaxation times were measured and used to define the T2w-TSE protocol. T2w imaging was performed using a TSE sequence (pulse repetition time/echo time 3000–3640/71 ms) with prolonged excitation and refocusing pulses to reduce specific absorption rate.

Results
High quality T2w TSE imaging was performed in less than 2 min in all subjects. Tumors of patients with gold-standard tumor localization (MR-guided biopsy or prostatectomy) were well visualized on 7 T imaging (n = 3). The number of consecutive slices achievable within a 10-g averaged specific absorption rate limit of 10 W/kg was ≥28 in all subjects, sufficient for full prostate coverage with 3-mm slices in at least one direction.

Conclusion
High quality T2w TSE prostate imaging can be performed routinely and within specific absorption rate limits at 7 T with an external transceive body array.
Y1  - 2014
U6  - https://doi.org/10.1002/mrm.24818
SN  - 1522-2594
VL  - 71
IS  - 5
SP  - 1711
EP  - 1719
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Lohr, Jürgen
T1  - Server für den interaktiven Einsatz
T1  - Server for the interactive use
N2  - Jürgen Lohr, Jahrgang 1962, beschäftigt mit Softwareentwicklung im Projekt "Interaktive Multimedia" bei Telekom AG, Entwicklungszentrum Berlin. Zuerst erschienen in: Telekom-Praxis Ausgabe 1996. Inhaltsverzeichnis: 1. Einleitung 1.1 Einführung 1.2 Neue Dienste und Anwendungen 2 Modell zur Verteilung und Architektur 3 Technologien 3.1 Netzwerk 3.2 Computertechniken 3.3. Aufgaben der Server 4 Geplanter Einsatz der Pilotprojekte 4.1 Pilote der Telekom 4.2 Show-Case Berlin 5 Verwendete Server-Architektur 5.1 Berlin - SEL/Alcatel 5.2 Hanburg - Philips 5.3. Köln/Bonn - Digital, FUBA und Nokia 5.4 Nürnberg - Oracle, nCube und Sequent 5.5 Stuttgart - SEL/Alcatel, Hewlett Packard und Bosch 6 Zukünftige Aspekte 6.1 DVB 6.2 DAVIC 6.3 weitere Aspekte 7 Zusammenfassung 8 Schrifttum 9 verwendete Abkürzungen
KW  - Multimediamarkt
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Lohr, Jürgen
T1  - XAPI - eine universelle Kommunikationsplattform
T1  - XAPI - a universal communication platform
N2  - zuerst erschienen in Telekom-Praxis Ausgabe 1997. Von Jürgen Lohr, Jahrgang 1962, beschäftigt mit Softwareentwicklung im Projekt "Interaktive Multimedia" bei der Deutschen Telekom AG, Entwicklungszentrum Berlin. 26 S. Der Beitrag befaßt sich mit dem Thema der universellen Kommunikationsplattform für neue, interaktive, multimediale Dienste und Anwendungen. Ausgehend von den Diensten wird ein Referenzmodell für offene Kommunikation und die Kommunikationsplattform kurz vorgestellt. Desweiteren wird die XAPI mit den Grundbegriffen, den Phasen der Kommunikation und dem Status Modell dargelegt. Ebenfalls werden die realisierten Service Provider erläutert. Abschließend werden zukünftige Vorhaben aus den Standardisierungsprojekten ITU und DAVIC sowie weitere Realisierungen aufgezeigt.
KW  - Multimediamarkt
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Lohr, Jürgen
T1  - MPEG-Standards für Multimedia-Dienste (Video-Standards für Multimedia)
T1  - MPEG standards for multimedia services (video standards for multimedia)
N2  - Zuerst erschienen in Telekom-Praxis Ausgabe 2000. 24 S. Innovative multimediale Dienste werden durch die Globalisierung und Konvergenz der Märkte, als auch durch Provider-Strategien ausgerichtet. Grundlegende Innovationsfelder sind: Globaler Zugang, Navigation und Intelligenter Inhalt. Die MPEG-Standards - im besonderen MPEG-4 und MPEG-7 - helfen, die oben genannten Forderungen zu erfüllen. Weiterhin ermöglichen sie auch für die Provider und den Kunden eine Zukunftssicherheit zu geben und einen zeitlichen Bestand für innovative Produkte zu sichern. Die Aufwärtkompabilität der MPEG-Standards ermöglicht die Vermeidung von Überschneidung und die Erschließung neuer Dimensionen.
KW  - Multimediamarkt
KW  - MPEG-Standard
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Lohr, Jürgen
T1  - Die Standards MPEG-4 und MPEG-7 in den Multimedia-Diensten
N2  - In: Unterrichtsblätter / Deutsche Telekom AG. 53. 2000. 7. S. 326-340. (15 S. ) Die Multimedia-Dienste erhalten durch die Datenreduktion bei der Kompressionstechnologie eine Wirtschaftlichkeit, die den breiteren Einsatz von breitbandigen Diensten erlaubt. Die Dienste benötigen für die verschiedenen Medien nicht mehr so große Übertragungs- und Speicherleistungen. Bei den entwickelten Verfahren, den so genannten MPEG-(Motion Picture Experts Group-)Standards, werden die Video- und Tonsignale in die digitale Ebene überführt und anschließend unrelevante Signalanteile entfernt. Der daraus resultierende Datenstrom benötigt weniger Bandbreite bei der Übertragung zum Endkunden. Die MPEG-Organisation wurde bereits im Jahre 1988 ins Leben gerufen und ist ein gemeinsames Gremium der beiden Organisationen ISO (International Standard Organization) und IEC (International Electrotechnical Commission), welches sich mit der Standardisierung von Kodier- und Kompressionsverfahren für die digitalen Bild-, Video und Audioformate befasst. Mittlerweile sind vier wichtige Standards mit MPEG-1, MPEG-2 und MPEG-4 verabschiedet worden sowie mit MPEG-7 in Vorbereitung. Da die Grundlagen zu MPEG-1, -2 und -Audio bereits in anderen Beiträgen behandelt wurden, werden hier ausschließlich die neuen bzw. aktuellen MPEG-Standards vorgestellt.
KW  - MPEG 4
KW  - MPEG 7
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Lohr, Jürgen
T1  - Content-Management für die Verteilung von Multimedia-Diensten
N2  - In: Unterrichtsblätter / Deutsche Telekom AG. 54. 2001. 7. S. 410-420 (11 S. ) Angesichts der zunehmenden Globalisierung von Informationen und Informationsdiensten können Inhalte (Contents) für mehrere unterschiedliche Dienste genutzt und auf verschiedenen Endgeräten ausgegeben werden. Hier setzt ein Content-Management-System (CMS) an, welches sowohl für die Kunden als auch für die Anbieter der unterschiedlich distribuierten Dienste Synergien und somit Einsparpotenziale bietet. Darüber hinaus werden für die Anbieter dieser Dienste durch die allgemeine Definition von Leistungstools und die Definition von Wertschöpfungsketten künftige Produktentwicklungen vereinheitlicht und optimiert werden. Mit der Entwicklung und Vertriebsfreigabe immer weiterer Informationsdienste, die von verschiedenen Dienste-Providern betrieben werden, ist der Bedarf an einer Koordinierung der Entwicklungen und Investitionen im Bereich der Content-Akquisition und des Content-Management (CM) bedeutend angestiegen. Neben Akquisition, lizenzrechtlichen Fragen und Verwaltung des im Rahmen von Diensten angebotenen Content rücken vor allem auch Fragen der Gestaltung von Content-Management-Plattformen (CMP) immer stärker in den Blickpunkt. Der Beitrag stellt die globalen Ergebnisse dar, die in einem Forschungs- und Entwicklungsauftrag des Zentralbereichs Innovationsmanagement der Deutschen Telekom zu diesem Thema ermittelt wurden. Es werden die Kernmodule für eine Content- Management-Plattform beschrieben, die die Anforderungen an die Bereitstellung vielfältiger Content-Angebote erfüllt. Die folgenden Themen werden behandelt: + Begriffsbestimmung, + Content- und Dienste-Portfolio, + Standard Content-Prozess, + synergetische Content-Plattform (sCP), + Modelle der sCP, + Aspekte beim Betrieb und + Nutzen eines Content-Management.
KW  - Content Management
KW  - Multimediamarkt
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Lohr, Jürgen
T1  - Modellierung von Multimedia-Diensten mit Hilfe der Chaostheorie
N2  - In: Unterrichtsblätter / Deutsche Telekom AG. 53. 2000. 11. S. 618-634 (17 S.) Wo man hinblickt: Turbulenzen, Unvorhersagbarkeiten, Unregelmäßigkeiten – kurz Chaos. Ist unsere wissenschaftliche Sichtweise falsch, alle Vorgänge des Kosmos auf die Basis der Ordnung abzubilden? – Nein. Mit Chaos ist nicht Fehlen jeglicher Ordnung und völlig regelloses Durcheinander gemeint, sondern – auf Grund der Vernetztheit der vielen Elemente, die miteinander eine Wechselwirkung haben – die Unberechenbarkeit der Naturprozesse. Die Chaostheorie erlaubt durch die Modellierung weit auseinander liegende Problemfelder miteinander zu verknüpfen, um dann in einem Modell die Zusammenhänge erkennbar zu machen. Mit Hilfe der Chaostheorie werden gesellschaftliche Prozesse abgebildet und dann mit einer Simulation neue, globale Strategien erstellt, um kritische Systempunkte (Systemelemente) zu erkennen. Der nachfolgende Beitrag beschreibt die Modellierung am Beispiel der Multimedia-Dienste und gibt mit einem umfassenden Glossar eine Einführung in die Begrifflichkeiten der Chaostheorie. Die Chaostheorie ist die mathematisch-physikalische Theorie zur Beschreibung von Systemen, die zwar durch Gesetzmäßigkeiten determiniert sind, bei denen aber kleine Änderungen der Anfangsbedingungen ein exponentielles Anwachsen von Störungen bewirken. Das Verhalten derartiger Systeme führt zur Ausbildung chaotischer Strukturen und ist langfristig nicht vorhersagbar. Die Chaostheorie ist beispielsweise in der nichtlinearen Optik, bei chemischen Reaktionen und der Wettervorhersage anwendbar.
KW  - Chaostheorie
KW  - Multimediamarkt
KW  - Chaostheorie
KW  - Multimedia-Dienst
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Lohr, Jürgen
T1  - Probleme der Multimedia Dienste im nationalen und internationalen Umfeld
N2  - In: Telekom-Praxis. Ausgabe 1998. 25 S.
KW  - Multimediamarkt
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Limpert, Nicolas
A1  - Wiesen, Patrick
A1  - Ferrein, Alexander
A1  - Kallweit, Stephan
A1  - Schiffer, Stefan
T1  - The ROSIN Project and its Outreach to South Africa
JF  - R&D Journal
Y1  - 2019
VL  - 35
SP  - 1
EP  - 6
ER  - 
TY  - JOUR
A1  - Lerchl, Alexander
A1  - Krüger, Heike
A1  - Niehaus, Michael
A1  - Streckert, Joachim R.
A1  - Bitz, Andreas
A1  - Hansen, Volkert
T1  - Effects of mobile phone electromagnetic fields at nonthermal SAR values on melatonin and body weight of Djungarian hamsters (Phodopus sungorus)
JF  - Journal of Pineal Research
Y1  - 2008
U6  - https://doi.org/10.1111/j.1600-079X.2007.00522.x
SN  - 1600-079X
VL  - 44
IS  - 3
SP  - 267
EP  - 272
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Rake, H.
A1  - Pütter, L.
T1  - Regelung der Qualitaet beim Brennen von Zementklinker
JF  - Regelungstechnische Praxis : rtp
Y1  - 1976
SN  - 0340-4730
VL  - 18
IS  - 4
SP  - 87
EP  - 91
PB  - Oldenbourg
CY  - München
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Rake, H.
A1  - Pütter, L.
T1  - Prozeßrechnerautomatisierung von Wärmeprozessen in der Grundstoffindustrie
JF  - Industrie-Anzeiger
Y1  - 1976
SN  - 0019-9036
VL  - 98
IS  - 17/18
SP  - 286
EP  - 289
PB  - Konradin
CY  - Leinfelden-Echterdingen
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Rake, H.
A1  - Pütter, L.
T1  - Prozeßrechnerautomatisierung von Wärmeprozessen
JF  - Elektro-Anzeiger
Y1  - 1976
SN  - 0013-5518
VL  - 29
IS  - 5
SP  - 98
EP  - 101
PB  - Konradin
CY  - Leinfelden-Echterdingen
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Jäger, G.
A1  - Pütter, L.
T1  - Anwendung eines Prozessmodells zur Regelung der Produktqualität bei der Zementklinker-Herstellung / Jaeger, G. ; Lepers, H. Puetter, L. [u.a.]
JF  - VDI-Berichte (1977)
Y1  - 1977
SP  - 87
EP  - 93
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
T1  - Fehler bei der Systemanalyse aus stochastisch gestörten Sprungantworten
JF  - Regelungstechnik und Prozeß-Datenverarbeitung
N2  - Es wird von Gleichungen ausgegangen, mit denen die Modellkoeffizienten von Regelstrecken mit Ausgleich aus der gemessenen Sprungantwort ermittelt werden können.  Die Übertragungsfunktion der Regelstrecke hat einen konstanten Zähler und ein Nennerpolynom. Unter der Annahme, daß die ideale und exakte Sprungantwort des Systems durch ein stochastisches Signal gestört wird, wird untersucht, wie die Fehler der ermittelten Modellkoeffizienten von Kennwerten des Störsignals und von der Meßzeit für die Sprungantwort abhängen. Durch eine Simulation auf dem Digitalrechner wurden die Ergebnisse kontrolliert. Es zeigt sich, daß durch eine Filterung der gestörten Sprungantwort über einen Tiefpaß keine Verbesserung der Analyseergebnisse erreicht werden kann, da das Identifizierungsverfahren eine glättende Eigenschaft hat.
Y1  - 1973
U6  - https://doi.org/10.1524/auto.1973.21.112.229
SN  - 0034-3226
VL  - 21
IS  - 7
SP  - 229
EP  - 233
PB  - De Gruyter
CY  - Berlin
ER  -