Refine
Year of publication
- 2012 (164) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (59)
- INB - Institut für Nano- und Biotechnologien (28)
- IfB - Institut für Bioengineering (28)
- Fachbereich Elektrotechnik und Informationstechnik (25)
- Fachbereich Chemie und Biotechnologie (15)
- Fachbereich Maschinenbau und Mechatronik (14)
- Solar-Institut Jülich (13)
- Fachbereich Luft- und Raumfahrttechnik (10)
- Fachbereich Wirtschaftswissenschaften (10)
- Fachbereich Bauingenieurwesen (9)
Language
- English (164) (remove)
Document Type
- Article (82)
- Conference Proceeding (59)
- Book (6)
- Part of a Book (5)
- Conference: Meeting Abstract (5)
- Doctoral Thesis (5)
- Other (1)
- Review (1)
Keywords
- (Bio)degradation (1)
- 802.15.4 (1)
- Acceleration (1)
- Afterload (1)
- Alginate beads (1)
- Anastomotic leakage (1)
- Autolysis (1)
- Avalanche (1)
- Bank-issued Warrants (1)
- Bio-Sensors (1)
- Biosensor (1)
- Bluetooth (1)
- Borehole heat exchanger (1)
- Calorimetric gas sensor (1)
- Cell permeability (1)
- CellDrum (1)
- Cellular force (1)
- Central receiver system (1)
- Chemical imaging sensor (1)
- Circular Dichroism (1)
- Cloud Computing (1)
- Cloud Service Broker (1)
- Compliance (1)
- Concentrated solar collector (1)
- Consensus (1)
- Contractile tension (1)
- Contractility (1)
- C–V method (1)
- Decomposition (1)
- Detergent protease (1)
- Discourse ethics (1)
- Disposition Effect (1)
- Distributed Control Systems, (1)
- Eisschicht (1)
- Elemental (1)
- End-to-end colorectal anastomosis (1)
- Endothelial cells (1)
- Esophageal Doppler monitor (1)
- Extracellular enzymes (1)
- Field-effect sensor (1)
- Finite differences (1)
- Finite element modelling (1)
- Force (1)
- Freeze–thaw process (1)
- Fresnel collector (1)
- Grid Computing (1)
- Heat transport (1)
- Hydrogen peroxide (1)
- Hypersecretion (1)
- IP-based networks (1)
- Impedance spectroscopy (1)
- Individual Investors (1)
- Industrial Automation Technology, (1)
- Kinetic energy (1)
- LAPS (1)
- Light-addressable potentiometric sensor (1)
- Lipopolysaccharide (1)
- Liver (1)
- Low-field NMR (1)
- MATLAB , MLPI , Motion control , Open Core , industrial drives , rapid control prototypin , sercos automation bus (1)
- Marker-free mutagenesis (1)
- NGN (1)
- NMR exchange relaxometry (1)
- NONOate (1)
- Nano Materials (1)
- Nanomaterial (1)
- Nanotechnologie (1)
- Negative Feedback Trading (1)
- Nitric Oxide (1)
- Nitric Oxide Donor (1)
- Numerical linear algebra (1)
- Optical and thermal analysis (1)
- Organic light-emitting diode display (1)
- PIV (1)
- PROFINET (1)
- Poly(d,l-lacticacid) (1)
- Polyimide (1)
- Real-time monitoring (1)
- Recombinant activated protein C (1)
- Requirements prioritization (1)
- Requirements relations (1)
- ScaLAPACK (1)
- Snow (1)
- Solar concentration (1)
- Sonde (1)
- Spleen (1)
- Stenotrophomonas maltophilia (1)
- Sterilisation process (1)
- Surgical staplers (1)
- Tool support (1)
- Trading Behavior (1)
- Uracil-phosphoribosyltransferase (1)
- VOF (1)
- Variable height stapler design (1)
- Velocity (1)
- Volume status (1)
- Wireless Networks (1)
- Workflow (1)
- Workflow Orchestration (1)
- architectural design process (1)
- brachytherapy (1)
- dam-break (1)
- design theory (1)
- drag force (1)
- eigensolvers (1)
- incontinence (1)
- instruments (1)
- interdisciplinarity (1)
- methodologies (1)
- next generation network (1)
- numerical model (1)
- performance analysis (1)
- physical model (1)
- product bundling (1)
- prostate cancer (1)
- prostatectomy (1)
- quality of life (1)
- subglacial aquatic ecosystems (1)
- subsurface ice (1)
- telecommunication (1)
If we think about applications for modern Power MOSFETs using trench technology, running them in linear mode may not be top of the priority list. Yet there are multiple uses for Trench Power MOSFETs in linear mode. In fact, even turning the device on and off in switching applications is a form of linear operation. Also, these components can be run in linear mode to protect the device against voltage surges. This article will illustrate the factors that need to be considered for linear operation and show how Trench Power MOSFETs are suited to it.
This contribution discusses the utilization of RF power in an MRI system with RF mode shimming which enables the superposition of circularly polarized modes of a transmit RF coil array driven by a Butler matrix. Since the required power for the individual modes can vary widely, mode-shimming can result in a significant underutilization of the total available RF power. A variable power combiner (VPC) is proposed to improve the power utilization: it can be realized as a reconfiguration of the MRI transmit system by the inclusion of one additional matrix network which receives the power from all transmit amplifiers at its input ports and provides any desired (combined) power distribution at its output ports by controlling the phase and amplitude of the amplifiers’ input signals. The power distribution at the output ports of the VPC is then fed into the “mode” ports of the coil array Butler matrix in order to superimpose the spatial modes at the highest achievable power utilization. The VPC configuration is compared to the standard configuration of the transmit chain of our MRI system with 8 transmit channels and 16 coils. In realistic scenarios, improved power utilization was achieved from 17% to 60% and from 14% to 55% for an elliptical phantom and a region of interest in the abdomen, respectively, and an increase of the power utilization of 1 dB for a region of interest in the upper leg. In general, it is found that the VPC allows significant improvement in power utilization when the shimming solution demands only a few modes to be energized, while the technique can yield loss in power utilization in cases with many modes required at high power level.
Visual Virology
(2012)