TY - JOUR A1 - Frauenrath, Tobias A1 - Fuchs, Katharina A1 - Dieringer, Matthias A. A1 - Özerdem, Celal A1 - Patel, Nishan A1 - Renz, Wolfgang A1 - Greiser, Andreas A1 - Elgeti, Thomas A1 - Niendorf, Thoralf T1 - Detailing the use of magnetohydrodynamic effects for synchronization of MRI with the cardiac cycle: A feasibility study JF - Journal of Magnetic Resonance Imaging N2 - Purpose: To investigate the feasibility of using magnetohydrodynamic (MHD) effects for synchronization of magnetic resonance imaging (MRI) with the cardiac cycle. Materials and Methods: The MHD effect was scrutinized using a pulsatile flow phantom at B0 = 7.0 T. MHD effects were examined in vivo in healthy volunteers (n = 10) for B0 ranging from 0.05–7.0 T. Noncontrast-enhanced MR angiography (MRA) of the carotids was performed using a gated steady-state free-precession (SSFP) imaging technique in conjunction with electrocardiogram (ECG) and MHD synchronization. Results: The MHD potential correlates with flow velocities derived from phase contrast MRI. MHD voltages depend on the orientation between B0 and the flow of a conductive fluid. An increase in the interelectrode spacing along the flow increases the MHD potential. In vivo measurement of the MHD effect provides peak voltages of 1.5 mV for surface areas close to the common carotid artery at B0 = 7.0 T. Synchronization of MRI with the cardiac cycle using MHD triggering is feasible. MHD triggered MRA of the carotids at 3.0 T showed an overall image quality and richness of anatomic detail, which is comparable to ECG-triggered MRAs. Conclusion: This feasibility study demonstrates the use of MHD effects for synchronization of MR acquisitions with the cardiac cycle. J. Magn. Reson. Imaging 2012;36:364–372. © 2012 Wiley Periodicals, Inc. Y1 - 2012 U6 - https://doi.org/10.1002/jmri.23634 SN - 1522-2586 VL - 36 IS - 2 SP - 364 EP - 372 PB - Wiley-Liss CY - New York ER - TY - JOUR A1 - Franzen, Julius A1 - Pinders, Erik A1 - Pfaff, Raphael A1 - Enning, Manfred T1 - RailCrowd’s virtual fleets: Make most of your asset data JF - Deine Bahn N2 - For smaller railway operators or those with a diverse fleet, it can be difficult to collect sufficient data to improve maintenance programs. At the same time, new rules such as entity in charge of maintenance – ECM – regulations impose an additional workload by requiring a dedicated maintenance management system and specific reports. The RailCrowd platform sets out to facilitate compliance with ECM and similar regulations while at the same time pooling anonymised fleet data across operators to form virtual fleets, providing greater data insights. Y1 - 2018 SN - 0948-7263 IS - 9 SP - 11 EP - 13 PB - Bahn-Fachverlag CY - Berlin ER - TY - JOUR A1 - Franko, Josef A1 - Du, Shengzhi A1 - Kallweit, Stephan A1 - Duelberg, Enno Sebastian A1 - Engemann, Heiko T1 - Design of a Multi-Robot System for Wind Turbine Maintenance JF - Energies N2 - The maintenance of wind turbines is of growing importance considering the transition to renewable energy. This paper presents a multi-robot-approach for automated wind turbine maintenance including a novel climbing robot. Currently, wind turbine maintenance remains a manual task, which is monotonous, dangerous, and also physically demanding due to the large scale of wind turbines. Technical climbers are required to work at significant heights, even in bad weather conditions. Furthermore, a skilled labor force with sufficient knowledge in repairing fiber composite material is rare. Autonomous mobile systems enable the digitization of the maintenance process. They can be designed for weather-independent operations. This work contributes to the development and experimental validation of a maintenance system consisting of multiple robotic platforms for a variety of tasks, such as wind turbine tower and rotor blade service. In this work, multicopters with vision and LiDAR sensors for global inspection are used to guide slower climbing robots. Light-weight magnetic climbers with surface contact were used to analyze structure parts with non-destructive inspection methods and to locally repair smaller defects. Localization was enabled by adapting odometry for conical-shaped surfaces considering additional navigation sensors. Magnets were suitable for steel towers to clamp onto the surface. A friction-based climbing ring robot (SMART— Scanning, Monitoring, Analyzing, Repair and Transportation) completed the set-up for higher payload. The maintenance period could be extended by using weather-proofed maintenance robots. The multi-robot-system was running the Robot Operating System (ROS). Additionally, first steps towards machine learning would enable maintenance staff to use pattern classification for fault diagnosis in order to operate safely from the ground in the future. Y1 - 2020 U6 - https://doi.org/10.3390/en13102552 SN - 1996-1073 VL - 13 IS - 10 SP - Article 2552 PB - MDPI CY - Basel ER - TY - JOUR A1 - Franke, Thomas A1 - Bosis, R. A1 - Napoli, M.-D. T1 - Über das Internet steuerbarer Gebläseprüfstand mit einstellbaren Eintrittsleitschaufeln JF - Virtuelle Instrumente in der Praxis : Begleitband zum Kongreß VIP 2001 / Rahman Jamal ; Hans Jaschinski Y1 - 2001 SN - 3-7785-2829-7 N1 - Serie Praxiswissen Elektronik-Industrie : Messtechnik SP - 219 EP - 225 PB - Hüthig Verlag CY - Heidelberg [u.a.] ER - TY - JOUR A1 - Franke, Helmut A1 - Streckert, Joachim A1 - Bitz, Andreas A1 - Goeke, Johannes A1 - Hansen, Volkert A1 - Ringelstein, E. Bernd A1 - Nattkämper, Heiner A1 - Galle, Hans-Joachim A1 - Stögbauer, Florian T1 - Effects of Universal Mobile Telecommunications System (UMTS) electromagnetic fields on the blood-brain barrier in vitro JF - Radiation Research Y1 - 2005 U6 - https://doi.org/10.1667/RR3424.1 SN - 1938-5404 VL - 164 IS - 3 SP - 258 EP - 269 ER - TY - JOUR A1 - Frank, T. A1 - Buchwald, D. A1 - Pennekamp, W. A1 - Reber, D. A1 - Sponagel, Stefan A1 - Laszkovics, A. A1 - Weber, Hans-Joachim T1 - Röntgenologische Untersuchung der Strömungseigenschaften funktioneller Komponenten der Herz-Lungen-Maschine JF - Kardiotechnik. 18 (2009), H. 2 Y1 - 2009 SN - 0941-2670 N1 - gedruckt in der Bibliothek unter der Signatur 63 Z 629 SP - 31 EP - 35 ER - TY - JOUR A1 - Forst, Thomas A1 - Karagiannis, E. A1 - Lübben, G. A1 - Hohberg, C. A1 - Schöndorf, T. A1 - Dikta, Gerhard A1 - Drexler, M. A1 - Morcos, M. A1 - Dänschel, W. A1 - Borchert, M. A1 - Pfützner, A. T1 - Pleiotrophic and anti-inflammatory effects of pioglitazone precede the metabolic activity in type 2 diabetic patients with coronary artery disease JF - Atherosclerosis. 197 (2008), H. 1 Y1 - 2008 U6 - https://doi.org/10.1016/j.atherosclerosis.2007.05.006 SN - 0021-9150 SP - 311 EP - 317 ER - TY - JOUR A1 - Fornaciari, Andrea A1 - Guidetti, Marco A1 - Havermann, Marc A1 - Lettini, Antonio T1 - Maccine mobili più efficienti JF - Fluidotecnica N2 - Secondo le attuali normative tutte le macchine mobili, entro il 2012, dovranno essere soggette a un incremento di efficienza energetica. Un’evoluzione del sistema idraulico potrà contribuire in maniera significativa al miglioramento richiesto. Elettronica e idraulica sempre più protagoniste. Y1 - 2010 IS - 345 SP - 11 EP - 14 PB - Quine Business Publisher CY - Milano ER - TY - JOUR A1 - Fonti, Patrick A1 - von Arx, Georg A1 - García-González, Ignacio A1 - Eilmann, Britta A1 - Sass-Klaassen, Ute G. W. A1 - Gärtner, Holger A1 - Eckstein, Dieter T1 - Studying global change through investigation of the plastic responses of xylem anatomy in tree rings JF - New Phytologist N2 - Variability in xylem anatomy is of interest to plant scientists because of the role water transport plays in plant performance and survival. Insights into plant adjustments to changing environmental conditions have mainly been obtained through structural and functional comparative studies between taxa or within taxa on contrasting sites or along environmental gradients. Yet, a gap exists regarding the study of hydraulic adjustments in response to environmental changes over the lifetimes of plants. In trees, dated tree-ring series are often exploited to reconstruct dynamics in ecological conditions, and recent work in which wood-anatomical variables have been used in dendrochronology has produced promising results. Environmental signals identified in water-conducting cells carry novel information reflecting changes in regional conditions and are mostly related to short, sub-annual intervals. Although the idea of investigating environmental signals through wood anatomical time series goes back to the 1960s, it is only recently that low-cost computerized image-analysis systems have enabled increased scientific output in this field. We believe that the study of tree-ring anatomy is emerging as a promising approach in tree biology and climate change research, particularly if complemented by physiological and ecological studies. This contribution presents the rationale, the potential, and the methodological challenges of this innovative approach. Y1 - 2010 U6 - https://doi.org/10.1111/j.1469-8137.2009.03030.x SN - 1469-8137 (Online) SN - 0028-646X (Print) VL - 185 IS - 1 SP - 42 EP - 53 PB - Wiley-Blackwell CY - Oxford ER - TY - JOUR A1 - Fonti, Patrick A1 - Eilmann, Britta A1 - García-González, Ignacio A1 - von Arx, Georg T1 - Expeditious building of ring-porous earlywood vessel chronologies without loosing signal information JF - Trees : structure and function Y1 - 2009 U6 - https://doi.org/10.1007/s00468-008-0310-z SN - 0931-1890 (Print) SN - 1432-2285 (Online) VL - 23 IS - 3 SP - 665 EP - 671 PB - Springer CY - Berlin ER - TY - JOUR A1 - Foltz, Christian A1 - Schneider, Nicole A1 - Wolf, Martin R. A1 - Kausch, Bernhard A1 - Schlick, Christopher A1 - Luczak, Holger ED - Nagl, Manfred T1 - Usability engineering JF - Collaborative and distributed chemical engineering : from understanding to substantial design process support; results of the IMPROVE Project. - (Lecture notes in computer science ; 4970) Y1 - 2008 SN - 978-3-540-70552-9 U6 - https://doi.org/10.1007/978-3-540-70552-9_21 SP - 527 EP - 554 PB - Springer CY - Berlin ER - TY - JOUR A1 - Focke, Markus A1 - Mink, Andreas A1 - Forcher, Ralf T1 - Intelligente Zulaufsteuerung durch Telematikgestützte Transportevents : Konzeption eine Telematikbasierten Supply Chain Event Managements für die Zulaufsteuerung industrieller Produktionsunternehmen / Focke, Markus ; Mink, Andreas ; Forcher, Ralf JF - Logistik-Management. 6 (2004), H. 4 Y1 - 2004 SN - 1436-6231 SP - 47 EP - 59 ER - TY - JOUR A1 - Focke, Markus T1 - Flussorientierung in der Beschaffungslogistik: ein Ansatz zur Optimierung auf Basis des Toyota Produktionssystems JF - Märkte, Anwendungsfelder und Technologien in der Logistik : Ergebnisse und Reflexion von 20 Jahren Logistikforschung ; Festschrift für Peter Klaus / Stefanie Müller ... (Hrsg.) Y1 - 2009 SN - 978-3-8349-1821-5 SP - 25 EP - 44 PB - Gabler CY - Wiesbaden ER - TY - JOUR A1 - Fleischhaker, Robert A1 - Krauß, Nico A1 - Schättiger, Farina A1 - Dekorsy, Thomas T1 - Consistent characterization of semiconductor saturable absorber mirrors with singe-pulse and pump-probe spectroscopy JF - Optics Express Y1 - 2013 U6 - https://doi.org/10.1364/OE.21.006764 SN - 1094-4087 VL - 21 IS - 6 SP - 6764 EP - 6776 PB - Optica CY - Washington, DC ER - TY - JOUR A1 - Fleischhaker, Robert A1 - Evers, Jörg A1 - Dey, Tarak N. T1 - Phase modulation induced by cooperative effects in electromagnetically induced transparency JF - Physical Review A - Atomic, molecular, and optical physics N2 - We analyze the influence of dipole-dipole interactions in an electromagnetically induced transparency set up for a density at the onset of cooperative effects. To this end, we include mean-field models for the influence of local-field corrections and radiation trapping into our calculation. We show both analytically and numerically that the polarization contribution to the local field strongly modulates the phase of a weak pulse. We give an intuitive explanation for this local-field-induced phase modulation and demonstrate that it distinctively differs from the nonlinear self-phase-modulation that a strong pulse experiences in a Kerr medium. Y1 - 2010 U6 - https://doi.org/10.1103/PhysRevA.82.013815 SN - 1050-2947 VL - 82 IS - 1 PB - AIP Publishing CY - Melville, NY ER - TY - JOUR A1 - Fleischhaker, Robert A1 - Evers, Jörg T1 - A Maxwell–Schrödinger solver for quantum optical few-level systems JF - Computer Physics Communications N2 - The msprop program presented in this work is capable of solving the Maxwell–Schrödinger equations for one or several laser fields propagating through a medium of quantum optical few-level systems in one spatial dimension and in time. In particular, it allows to numerically treat systems in which a laser field interacts with the medium with both its electric and magnetic component at the same time. The internal dynamics of the few-level system is modeled by a quantum optical master equation which includes coherent processes due to optical transitions driven by the laser fields as well as incoherent processes due to decay and dephasing. The propagation dynamics of the laser fields is treated in slowly varying envelope approximation resulting in a first order wave equation for each laser field envelope function. The program employs an Adams predictor formula second order in time to integrate the quantum optical master equation and a Lax–Wendroff scheme second order in space and time to evolve the wave equations for the fields. The source function in the Lax–Wendroff scheme is specifically adapted to allow taking into account the simultaneous coupling of a laser field to the polarization and the magnetization of the medium. To reduce execution time, a customized data structure is implemented and explained. In three examples the features of the program are demonstrated and the treatment of a system with a phase-dependent cross coupling of the electric and magnetic field component of a laser field is shown. Y1 - 2011 U6 - https://doi.org/10.1016/j.cpc.2010.10.018 SN - 0010-4655 VL - 182 IS - 3 SP - 739 EP - 747 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Fleischhaker, Robert A1 - Evers, Jörg T1 - Nonlinear effects in pulse propagation through Doppler-broadened closed-loop atomic media JF - Physical Review A - Atomic, molecular, and optical physics Y1 - 2008 U6 - https://doi.org/10.1103/PhysRevA.77.043805 SN - 1050-2947 VL - 77 IS - 4 SP - 043805 ER - TY - JOUR A1 - Fleischhaker, Robert A1 - Evers, Jörg T1 - Four-wave mixing enhanced white-light cavity JF - Physical Review A - Atomic, molecular, and optical physics Y1 - 2008 SN - 0556-2791 VL - 78 IS - 5 SP - 051802(R) ER - TY - JOUR A1 - Fleischhaker, Robert A1 - Evers, Jörg T1 - Phase-controlled pulse propagation in media with cross coupling of electric and magnetic probe field component JF - Physical Review A - Atomic, molecular, and optical physics Y1 - 2009 U6 - https://doi.org/10.1103/PHYSREVA.80.063816 SN - 1050-2947 VL - 80 IS - 6 SP - 063816 ER - TY - JOUR A1 - Fissabre, Anke A1 - Wilson, Ariane T1 - Der Turm mit zehn Spornen – Ein in Monthoiron gebauter Entwurf von Leonardo Da Vinci? JF - In situ: Zeitschrift für Architekturgeschichte Y1 - 2018 SN - 1866-959X N1 - gedruckt in der Bereichsbibliothek Bayernallee vorhanden. Signatur 13 Z 959-2018 IS - 1 SP - 65 EP - 82 PB - Wernersche Verlagsgesellschaft CY - Worms ER -