TY  - GEN
A1  - Lindel, Tomasz Dawid
A1  - Greiser, Andreas
A1  - Waxman, Patrick
A1  - Dietterle, Martin
A1  - Seifert, Frank
A1  - Fontius, Ulrich
A1  - Renz, Wolfgang
A1  - Dieringer, Matthias A.
A1  - Frauenrath, Tobias
A1  - Schulz-Menger, Jeanette
A1  - Niendorf, Thoralf
A1  - Ittermann, Bernd
T1  - Cardiac CINE MRI at 7 T using a transmit array
T2  - 2012 ISMRM Annual Meeting Proceedings
N2  - With its need for high SNR and short acquisition times, Cardiac MRI (CMR) is an intriguing target application for ultrahigh field MRI. Due to the sheer size of the upper torso, however, the known RF issues of 7T MRI are also most prominent in CMR. Recent years brought substantial progress but the full potential of the ultrahigh field for CMR is yet to be exploited. Parallel transmission (pTx) is a promising approach in this context and several groups have already reported B1 shimming for 7T CMR. In such a static pTx application amplitudes and phases of all Tx channels are adjusted individually but otherwise imaging techniques established in current clinical practice 1.5 T and 3 T are applied. More advanced forms of pTx as spatially selective excitation (SSE) using Transmit SENSE promise additional benefits like faster imaging with reduced fields of view or improved SAR control. SSE requires the full dynamic capabilities of pTx, however, and for the majority of today's implemented pTx hardware the internal synchronization of the Tx array does not easily permit external triggering as needed for CMR. Here we report a software solution to this problem and demonstrate the feasibility of CINE CMR at 7 T using a Tx array.
Y1  - 2012
SN  - 1545-4428
N1  - ISMRM 20th Annual Meeting & Exhibition, 5-11 May 2012, Melbourne, Australia
ER  - 
TY  - JOUR
A1  - Hüning, Felix
A1  - Heuermann, Holger
A1  - Wache, Franz-Josef
A1  - Jajo, Rami Audisho
T1  - A new wireless sensor interface using dual-mode radio
JF  - Journal of Sensors and Sensor Systems : JSSS
N2  - The integration of sensors is one of the major tasks in embedded, control and “internet of things” (IoT) applications. For the integration mainly digital interfaces are used, starting from rather simple pulse-width modulation (PWM) interface to more complex interfaces like CAN (Controller Area Network). Even though these interfaces are tethered by definition, a wireless realization is highly welcome in many applications to reduce cable and connector cost, increase the flexibility and realize new emerging applications like wireless control systems. Currently used wireless solutions like Bluetooth, WirelessHART or IO-Link Wireless use dedicated communication standards and corresponding higher protocol layers to realize the wireless communication. Due to the complexity of the communication and the protocol handling, additional latency and jitter are introduced to the data communication that can meet the requirements for many applications. Even though tunnelling of other bus data like CAN data is generally also possible the latency and jitter prevent the tunnelling from being transparent for the bus system. Therefore a new basic technology based on dual-mode radio is used to realize a wireless communication on the physical layer only, enabling a reliable and real-time data transfer. As this system operates on the physical layer it is independent of any higher layers of the OSI (open systems interconnection) model. Hence it can be used for several different communication systems to replace the tethered physical layer. A prototype is developed and tested for real-time wireless PWM, SENT (single-edge nibble transmission) and CAN data transfer with very low latency and jitter.
Y1  - 2018
U6  - https://doi.org/10.5194/jsss-7-507-2018
VL  - Volume 7
IS  - 2
SP  - 507
EP  - 515
PB  - Copernicus Publ.
CY  - Göttingen
ER  - 
TY  - CHAP
A1  - Bragard, Michael
A1  - Ronge, C.
A1  - De Doncker, R. W.
T1  - Sandwich design of high-power thyristor based devices with integrated MOSFET structure
T2  - Proceedings of the 2011 - 14th - European Conference on Power Electronics and Applications (EPE 2011) : Aug. 30, 2011 - Sept. 1, 2011, Birmingham, United Kingdom
Y1  - 2011
SN  - 978-1-61284-167-0 (Print)
SN  - 978-90-75815-15-3 (Online)
PB  - IEEE
CY  - Piscataway, NJ
ER  - 
TY  - GEN
A1  - Wiegner, J.
A1  - Volker, H.
A1  - Mainz, F.
A1  - Backes, A.
A1  - Löken, M.
A1  - Hüning, Felix
T1  - Wiegand-Effect-Powered Wireless IT Sensor Node
N2  - With the growing interest in small distributed sensors for the “Internet of Things”, more attention is being paid to energy harvesting techologies. Reducing or eliminating the need for external power sources or batteries make devices more self-sufficient, more reliable, and reduces maintenance requirements. The Wiegand effect is a proven technology for harvesting small amounts of electrical power from mechanical motion.
Y1  - 2022
N1  - PSMA International Energy Harvesting Workshop ~ 5-7 April 2022, Raleigh, NC, USA
ER  - 
TY  - GEN
A1  - Waiczies, Helmar
A1  - Kühne, André
A1  - Winter, Lukas
A1  - Frauenrath, Tobias
A1  - Hoffmann, Werner
A1  - Ittermann, Bernd
A1  - Waiczies, Sonia
A1  - Niendorf, Thoralf
T1  - Towards theranostics of rheumatoid arthritis: 1H/19F imaging of non-steroidal anti-inflammatory drugs in hand and wrist at 7 Tesla
T2  - 2013 ISMRM Annual Meeting Proceedings
N2  - We have developed a double-tuned ¹H/¹⁹F birdcage resonator dedicated for hand and wrist imaging at 7 T to locally image non-steroidal anti-inflammatory drugs (NSAID) such as 2-{[3-(Trifluoromethyl) phenyl]amino}benzoic acid. The preliminary in vivo images acquired by the double-tuned ¹H/¹⁹F birdcage resonator demonstrate the feasibility for ¹H/¹⁹F hand- and wrist-imaging at 7 T. While the diagnostic quality of the coil needs to be assessed in patients with inflammatory rheumatoid disease, first ¹⁹F images of the NSAID are encouraging, and point towards the prospect of applying ¹⁹F-MRI to visualize and quantify the concentration of therapeutically-active compound at the sites of inflammation.
Y1  - 2013
SN  - 1545-4428
N1  - ISMRM 21st Annual Meeting & Exhibition, 20-26 April 2013, Salt Lake City, Utah, USA
ER  - 
TY  - JOUR
A1  - Heinrichs, Uwe
A1  - Utting, Jane F.
A1  - Frauenrath, Tobias
A1  - Hezel, Fabian
A1  - Krombach, Gabriele A.
A1  - Hodenius, Michael A. J.
A1  - Kozerke, Sebastian
A1  - Niendorf, Thoralf
T1  - Myocardial T2 mapping free of distortion using susceptibility-weighted fast spin-echo imaging: A feasibility study at 1.5 T and 3.0 T
JF  - Magnetic Resonance in Medicine
N2  - This study demonstrates the feasibility of applying free-breathing, cardiac-gated, susceptibility-weighted fast spin-echo imaging together with black blood preparation and navigator-gated respiratory motion compensation for anatomically accurate T₂ mapping of the heart. First, T₂ maps are presented for oil phantoms without and with respiratory motion emulation (T₂ = (22.1 ± 1.7) ms at 1.5 T and T₂ = (22.65 ± 0.89) ms at 3.0 T). T₂ relaxometry of a ferrofluid revealed relaxivities of R2 = (477.9 ± 17) mM⁻¹s⁻¹ and R2 = (449.6 ± 13) mM⁻¹s⁻¹ for UFLARE and multiecho gradient-echo imaging at 1.5 T. For inferoseptal myocardial regions mean T₂ values of 29.9 ± 6.6 ms (1.5 T) and 22.3 ± 4.8 ms (3.0 T) were estimated. For posterior myocardial areas close to the vena cava T₂-values of 24.0 ± 6.4 ms (1.5 T) and 15.4 ± 1.8 ms (3.0 T) were observed. The merits and limitations of the proposed approach are discussed and its implications for cardiac and vascular T₂-mapping are considered.
Y1  - 2009
U6  - https://doi.org/10.1002/mrm.22054
SN  - 1522-2594
VL  - 62
IS  - 3
SP  - 822
EP  - 828
PB  - Wiley-Liss
CY  - New York
ER  - 
TY  - CHAP
A1  - Wolf, Martin R.
A1  - Lenz, Laura L.
T1  - The economic effectiveness of serious games in the healthcare environment : application and evaluation of the Comparative Transformation Model (CTM)
T2  - IEEE 3rd International Conference on Serious Games and Applications for Health : SeGAH 2014 ; Rio de Janeiro, Brazil, May 14 - 16
Y1  - 2015
SN  - 978-1-4799-4823-9
U6  - https://doi.org/10.1109/SeGAH.2014.7067089
SP  - 135
EP  - 142
PB  - IEEE [u.a.]
CY  - Piscataway, NJ
ER  - 
TY  - JOUR
A1  - Ferrein, Alexander
A1  - Meyer, Thomas
T1  - A Brief Overview of Artificial Intelligence in South Africa
JF  - AI Magazine
N2  - South Africa in recent years is the establishment of a number of research hubs involved in AI activities ranging from mobile robotics and computational intelligence, to knowledge representation and reasoning, and human language technologies. In this survey we take the reader through a quick tour of the research being conducted at these hubs, and touch on an initiative to maintain and extend the current level of interest in AI research in the country.
Y1  - 2012
U6  - https://doi.org/10.1609/aimag.v33i1.2357
SN  - 0738-4602
VL  - 33
IS  - 1
SP  - 99
EP  - 101
PB  - AAAI
CY  - Menlo Park
ER  - 
TY  - CHAP
A1  - Ringbeck, Thorsten
A1  - Schwarte, Rudolf
A1  - Buxbaum, Bernd
ED  - Korevaar, Eric John
T1  - Introduction of a new opto-electrical phase-locked loop in CMOS technology: the PMD-PLL
T2  - Optical wireless communications II / [SPIE Conference on Optical Wireless Communications II], 22 September 1999, Boston, Massachusetts. - (SPIE proceedings series ; 3850)
Y1  - 1999
SN  - 0-8194-3443-4
SN  - 0038-7355
SN  - 0361-0748
SN  - 0277-786X
N1  - Conference on Optical Wireless Communications <2, 1999, Boston, Mass.
SP  - 108
EP  - 116
PB  - SPIE
CY  - Bellingham, Wash.
ER  - 
TY  - JOUR
A1  - Bragard, Michael
A1  - van Hoek, H.
A1  - De Doncker, R. W.
T1  - A major design step in IETO concept realization that allows overcurrent protection and pushes limits of switching performance
JF  - IEEE transactions on power electronics
N2  - This paper presents the latest prototype of the integrated emitter turn-off thyristor concept, which potentially ranks among thyristor high-power devices like the gate turn-off thyristor and the integrated gate-commutated thyristor (IGCT). Due to modifications of the external driver stage and mechanical press-pack design optimization, this prototype allows for full device characterization. The turn-off capability was increased to 1600 A with an active silicon area of 823mm2 . This leads to a transient peak power of 672.1kW/cm² . Within this paper, measurements and concept assessment are presented and a comparison to state-of-the-art IGCT devices is provided.
Y1  - 2012
U6  - https://doi.org/10.1109/TPEL.2012.2189136
SN  - 0885-8993
VL  - 27
IS  - 9
SP  - 4163
EP  - 4171
PB  - IEEE
CY  - New York
ER  -