Accès ouvert
2024
article
OpenAlex
Jan Hoffmann, Wolf‐Rüdiger Canders, Markus Henke
New aerodynamic aircraft concepts enable the storage of volumetric liquid hydrogen (LH2). Additionally, the low temperatures of LH2 enable technologies such as the superconductivity of electrical fan drives and power distribution components. An increased power density of the onboard wiring harness and …
de
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Accès ouvert
2022
article
OpenAlex
Hendrik Schefer, Wolf‐Rüdiger Canders, Jan Hoffmann, Regine Mallwitz et autres
New aerodynamic aircraft concepts enable the storage of volumetric liquid hydrogen (LH2). Additionally, the low temperatures of LH2 allow technologies such as the superconductivity of electrical components. An increased power density of the onboard wiring harness and the electrical machine can be …
de
(code pays fourni par la source)
Accès ouvert
2020
article
OpenAlex
Jan Hoffmann, Wolf‐Rüdiger Canders, Markus Henke
Through applying an exemplary design study, the dependencies between current density, temperatures, and weight in an electrical drive system for a small range aircraft with conventional electrical fan or propeller drives are evaluated. This study applies a combined numerical (Finite Element Method …
de
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Accès ouvert
2020
conference-paper
OpenAlex
Markus Henke, Jan Hoffmann, Lennard Waschke
Im folgenden Beitrag wird eine Simulationsplattform vorgestellt, die im Umfeld der Elektrifizierung von Flugantrieben eine Abbildung des Flugverhaltens und daraus resultierend die Performanceanforderungen an die Energiewandler generiert.Der modulare Aufbau der Simulationsplattform ermöglicht unterschiedliche Detaillierungsgrade und auch Erweiterungen durch z.B. thermische Teilmodelle.Eingegangen wird …
de
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Accès ouvert
2019
article
OpenAlex
Wolf‐Rüdiger Canders, Jan Hoffmann, Markus Henke
This paper is aimed at giving an overview of possible cooling technologies for electrical machines and their assessment for aviation applications, e.g., fan or propeller drives. The most important demand for aircraft is the minimization of the drive system weight comprising electrical …
de
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Accès ouvert
2018
article
OpenAlex
Markus Henke, Gerrit Narjes, Jan Hoffmann, Constantin Wohlers et autres
The demand for alternative fueling methods to reduce the need for fossil fuels is not limited to the electrification of ground vehicles. More-electric and all-electric aircraft pose challenges, with extensive requirements in terms of power density, efficiency, safety, and environmental sustainability. This …
de
(code pays fourni par la source)
2017
article
OpenAlex
F. García, T. Grahn, Jan Hoffmann, A. Jokinen et autres
fi, de
(code pays fourni par la source)
2017
article
OpenAlex
Ahmed Sanaa Awny, Rajasekhar Nagulapalli, M. Kroh, Jan Hoffmann et autres
This paper presents the design and measurements of a 32-Gb/s differential-input differential-output transimpedance amplifier (TIA) employed in dual polarization integrated coherent receivers for 100-Gb Ethernet. A circuit technique is shown that uses a replica TIA to stabilize the operating point of the …
de, gb, us
(code pays fourni par la source)
2017
conference-paper
OpenAlex
Robert Emmerich, Robert Elschner, Carsten Schmidt‐Langhorst, Gijs van Elzakker et autres
We demonstrate error-free 80-km transmission of a 400-Gb/s channel in a colorless coherent C-band WDM system using a high-bandwidth micro-ICR. The WDM channels are colorlessly combined at the transmitter and colorlessly split/detected at the receiver.
de
(code pays fourni par la source)
Accès ouvert
2016
book-chapter
OpenAlex
F. García, R. Turpeinen, G. Latino, E. Tuominen et autres
The GEM-TPC detector will be part of the standard Super-FRS detection system, as tracker detectors at several focal stations along the separator and its three branches.
2016
conference-paper
OpenAlex
Stanislav Slovák, Pavol Galajda, Jan Hoffmann, Dušan Kocur
The aim of this paper is to show non-commercial and low-cost measurement methods, which can detect and monitor the composition of the fluid or additives directly in the production process, thus also showing measurement methods that allow easy and continuous collection and …
sk
(code pays fourni par la source)
2016
conference-paper
OpenAlex
Ahmed Sanaa Awny, Rajasekhar Nagulapalli, Daniel Micusik, Jan Hoffmann et autres
Long-haul optical links are experiencing a transition to coherent techniques because they enable the use of modulation techniques with high spectral efficiency, such as QPSK and QAM [1], which in turn require highly linear low-noise optical-electrical front-ends. To cope with the ever-growing …
de
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