275003 research outputs found
Sort by
Change-Management im Krankenhaus
No full textDie Einführung KI-basierter Lösungen im Krankenhaus stellt Organisationen vor besondere Herausforderungen. Dieses Whitepaper bietet einen praxisorientierten Erfahrungsbericht aus dem Projekt SmartHospital.NRW und schlägt die Brücke zwischen theoretischen Change-Management-Modellen und der konkreten Umsetzung im Klinikalltag. Der Leitfaden bündelt bewährte Werkzeuge, Rollenmodelle, Checklisten und Kommunikationsbausteine und zeigt anhand realer Beispiele, wie Veränderungsprozesse strukturiert, akzeptiert und nachhaltig verankert werden können. Ideal für Verantwortliche, Projektleitende und Change-Teams, die die digitale Transformation im Krankenhaus aktiv gestalten möchten
Hard magnetic and critical raw materials free permanent magnets on the basis of the Fe2P system
No full textConcepts for realizing High-Voltage Power Modules by Embedding of SiC Semiconductors
No full text3641Today's power electronics modules typically consist of a ceramics substrate (DBC - Direct Bond Copper), carrying IGBTs, diodes or MOSFETs. These semiconductors are soldered or sintered to the ceramics and their top sides are interconnected by thick Al wires. An integration of further components or functions on the DBC substrate is difficult or even not possible. Therefore, driver circuits and controllers have to be mounted to a separate substrate, typically an organic Printed Circuit board (PCB). The PCB has to be connected to the DBC by wires or pins. The mechanical integration of the whole system requires a bulky housing. Embedding of power semiconductors like SiC MOSFET allows a significant size reduction, improved electrical performance and a high degree of reliability of such modules. In the last years, the capability of PCB embedding technology for the realization of low and high voltage power modules was demonstrated. Fraunhofer IZM together with partners from the industry demonstrated the feasibility for different applications, from single die SiC packages to high voltage automotive traction inverters. In this paper, a general overview about innovative power module technologies will be given and the embedding of power semiconductors will be introduced in detail. It will address all most relevant point, like the demands on the semiconductor, the thermal and electrical considerations as well as the demands on the used materials To address the integration of the required driver circuits and controllers, the idea of modularization such electronics systems will also be presented. Here already packaged components will be used and embedded into PCB layers too. As a result, a modular approach to form a complete system will be developed. Different functional layers, e.g. power switches, logic modules, will be formed and finally stacked und connected to form the system. The concept and first realized demonstrators will be discussed
The Role of Innovation in a Postgrowth Society
No full text855871From an economic perspective, innovation and growth constitute a very close relationship with the former being a prerequisite for, and at the same time relying on, the latter. However, continued growth requires increasing amounts of natural resources and by doing so leads to the transgression of the boundaries for a safe operation of the system earth. In order to avoid this drawback, a halt (steady state) or even reversal of growth (de-or postgrowth) is proposed. What does this mean for innovation? This chapter shows that innovation is a far more diverse and complex phenomenon as the common notion of growth-related techno-economic innovation suggests. Not only are there different types of innovation, but also the relationship between these diverse innovation types, their intended impacts, nonintended side effects, and contributions to universally accepted societal goals such as well-being or sustainability is heterogeneous and far from linear. Although economic growth might remain a more or less relevant intermediate factor in some contexts, it generally seems by no means indispensable, neither as a prerequisite for innovation nor as a means to reach well-being nor as an end in itself
A hybrid differential game in renewable resources with sliding modes and crossing limit cycles
No full textThis paper investigates how ecological thresholds affect strategic exploitation in renewable resource games. We extend the standard single-agent optimal control harvesting model to a non-cooperative differential game with two agents, where the resource follows piecewise-smooth (PWS) dynamics and growth rates change abruptly at a stock threshold. The resulting three-dimensional (3D) state-costate system generates new strategic behaviour absent in smooth models. We identify sliding regions and hybrid crossing limit cycles (HCLCs) as potential open-loop Nash equilibria (OLNE), depending on parameter values. These outcomes correspond to distinct economic regimes: sliding equilibria capture threshold exploitation at fragile steady states, while HCLCs reflect endogenous boom-bust harvesting cycles. In contrast to two-dimensional (2D) optimal-control models where HCLCs cannot be optimal, our results show that strategic interaction in multi-agent settings can endogenously sustain such cycles. The analysis reveals how ecological discontinuities and strategic competition jointly shape resource dynamics, offering new insights into the stability and management of renewable resources.18
Handbook of Wind Energy Aerodynamics: With 678 Figures and 33 Tables
No full textThis handbook provides both a comprehensive overview and deep insights on the state-of-the-art methods used in wind turbine aerodynamics, as well as their advantages and limits. The focus of this work is specifically on wind turbines, where the aerodynamics are different from that of other fields due to the turbulent wind fields they face and the resultant differences in structural requirements. It gives a complete picture of research in the field, taking into account the different approaches which are applied. This book would be useful to professionals, academics, researchers and students working in the field
Fast Sinogram-based System Calibration for Field Free Line Magnetic Particle Imaging
No full text270281In this study, we propose a novel calibration method for magnetic particle imaging (MPI), in which a field-based calibration procedure is employed directly in the sinogram domain for a dynamic 3D field free line (FFL) sinusoidal trajectory. Unlike the conventional voxel-wise calibration in the image-domain, our approach involves performing calibration measurements in sinogram domain with alternating magnetic field offsets. The resulting sinogram-based calibration data are then used to synthesize the 3D system matrix (SM) in the image domain by exploiting the shift invariance property of MPI systems. With the proposed method, frequency mixing terms originating from the simultaneous translation and rotation of the FFL can be acquired without the use of an external calibration device, such as a precise 3D-axis robot. The proposed sinogram-based calibration method for the 3D FFL trajectory with 100 ms duration achieved acquisition of a 57×57×11 SM in approximately 1 minute with minimal image degradation. In contrast, the conventional system calibration method requires about 1 hour for the same spatial resolution.1
