TY  - JOUR
A1  - Schopen, Oliver
A1  - Shah, Neel
A1  - Esch, Thomas
A1  - Shabani, Bahman
T1  - Critical quantitative evaluation of integrated health management methods for fuel cell applications
JF  - International Journal of Hydrogen Energy
N2  - Online fault diagnostics is a crucial consideration for fuel cell systems, particularly in mobile applications, to limit downtime and degradation, and to increase lifetime. Guided by a critical literature review, in this paper an overview of Health management systems classified in a scheme is presented, introducing commonly utilised methods to diagnose FCs in various applications. In this novel scheme, various Health management system methods are summarised and structured to provide an overview of existing systems including their associated tools. These systems are classified into four categories mainly focused on model-based and non-model-based systems. The individual methods are critically discussed when used individually or combined aimed at further understanding their functionality and suitability in different applications. Additionally, a tool is introduced to evaluate methods from each category based on the scheme presented. This tool applies the technique of matrix evaluation utilising several key parameters to identify the most appropriate methods for a given application. Based on this evaluation, the most suitable methods for each specific application are combined to build an integrated Health management system.
KW  - Fuel cell
KW  - Health management system
KW  - Online diagnostic
KW  - Fault detection
KW  - Non-model-based Evaluation
Y1  - 2024
U6  - https://doi.org/10.1016/j.ijhydene.2024.05.156
SN  - 0360-3199
VL  - 70
SP  - 370
EP  - 388
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Ayala, Rafael Ceja
A1  - Harris, Isaac
A1  - Kleefeld, Andreas
T1  - Direct sampling method via Landweber iteration for an absorbing scatterer with a conductive boundary
JF  - Inverse Problems and Imaging
N2  - In this paper, we consider the inverse shape problem of recovering isotropic scatterers with a conductive boundary condition. Here, we assume that the measured far-field data is known at a fixed wave number. Motivated by recent work, we study a new direct sampling indicator based on the Landweber iteration and the factorization method. Therefore, we prove the connection between these reconstruction methods. The method studied here falls under the category of qualitative reconstruction methods where an imaging function is used to recover the absorbing scatterer. We prove stability of our new imaging function as well as derive a discrepancy principle for recovering the regularization parameter. The theoretical results are verified with numerical examples to show how the reconstruction performs by the new Landweber direct sampling method.
Y1  - 2024
U6  - https://doi.org/10.3934/ipi.2023051
SN  - 1930-8337
SN  - 1930-8345 (eISSN)
VL  - 18
IS  - 3
SP  - 708
EP  - 729
PB  - AIMS
CY  - Springfield
ER  - 
TY  - JOUR
A1  - Bung, Daniel Bernhard
T1  - Kamerabasierte Fließtiefen- und Geschwindigkeitsmessungen
JF  - Wasserwirtschaft
N2  - In der wasserbaulichen Forschung werden neben klassischen Messinstrumenten zunehmend kamerabasierte Verfahren genutzt. Diese erlauben neben der Bestimmung von Fließgeschwindigkeiten auch die Detektion der freien Wasseroberfläche oder zeitliche Vermessung von Kolken. Durch die hohen räumlichen und zeitlichen Auflösungen, welche neueste Kamerasensoren liefern, können neue Erkenntnisse in turbulenten, komplexen Strömungen gewonnen werden. Auch in der Praxis können diese Verfahren mit geringem Aufwand wichtige Daten liefern.
KW  - Wasserbau
KW  - Architektur
KW  - Wasserwirtschaft
KW  - Deutschland
Y1  - 2024
SN  - 0043-0978
VL  - 114
IS  - 4
SP  - 47
EP  - 53
PB  - Springer Vieweg
CY  - Wiesbaden
ER  -