A5038223572- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Plant Water Relations and Carbon Dynamics
- Millimeter-Wave Propagation and Modeling
- Antenna Design and Analysis
- Horticultural and Viticultural Research
- Automotive and Human Injury Biomechanics
- Antenna Design and Optimization
- Fluid Dynamics Simulations and Interactions
- VLSI and Analog Circuit Testing
- High-Velocity Impact and Material Behavior
- Microwave Engineering and Waveguides
- Human-Automation Interaction and Safety
- Risk and Safety Analysis
- Hydrology and Sediment Transport Processes
- Aerospace Engineering and Control Systems
- Tree-ring climate responses
- Occupational Health and Safety Research
- Vehicle Dynamics and Control Systems
Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut
2022-2025
Universität Ulm
2024
Czech Academy of Sciences, Institute of Botany
2024
Albert Einstein College of Medicine
2024
Karlsruhe Institute of Technology
2020
Battery safety design is important to consider from the individual Li-ion cell level of macro-system. On macro-level, failure in one single can lead propagation thermal runaway and rapidly set a whole battery pack on fire. Factors that impact outcome, such as model/chemistry electrical connection are here investigated using combination measurements. Several abusive tests were conducted, combining two different models (Molicel P42A LG M50, both 21700s) series parallel connections (16 per...
The investigation of lithium-ion battery failures is a major challenge for personnel and equipment due to the associated hazards (thermal reaction, toxic gases explosions). To perform such experiments safely, abuse-test chamber has been developed installed at microtomography beamline ID19 European Synchrotron Radiation Facility (ESRF). provides capability robustly in situ abuse tests through heat-resistant gas-tight design flexible geometries configurations, including single-cell multi-cell...
Abstract Understanding xylem embolism formation is challenging due to dynamic changes and multiphase interactions in conduits. Here, we hypothesise that spread involves gas diffusion xylem, affected by time. We measured hydraulic conductivity (K h ) flow‐centrifuge experiments over 1 at a given pressure temperature for stem samples of three angiosperm species. Temporal K 5, 22, 35°C, various pressures were compared modelled concentration recently embolised vessel the centre centrifuge...
Centrifuges provide a fast approach to quantify embolism resistance of xylem in vulnerability curves (VCs). Since formation is assumingly driven by pressure only, spin time not standardised for flow centrifuge experiments. Here, we explore what extent could be spin-time dependent, and hypothesise that changes hydraulic conductivity (Kh) would shift VCs towards higher water potential (Ψ) values over time. We quantified time-based shifts flow-centrifuge their parameter estimations six...
Abstract Centrifuges provide a fast and standard approach to quantify embolism resistance of xylem in vulnerability curves (VCs). Traditionally, formation centrifuge experiments is assumingly driven by speed, thus pressure, but unaffected spin time. Here, we explore what extent not only pressure also time dependent, hypothesise that time-stable hydraulic conductivity (K h ) values could shift VCs. We quantified time-based shifts flow- VCs their parameter estimations for six angiosperm...
Due to the increasing availability of drones, collisions between privately piloted drones and aircraft are becoming increasingly probable. It is commonly accepted, that during a collision, pose higher threat than birds same mass due strength stiffness. This manuscript presents experimental data recorded quasi-static high velocity impact experiments with critical components DJI Mavic 2 Zoom. their mass, stiffness, batteries were found be most component drone. The motors had stiffness...
Drones operating in an urban environment pose a potential collision threat to rotorcraft. In this paper, the battery pack of DJI MAVIC 2 ZOOM is analyzed since considered be greatest due its high weight and stiffness. Following pyramid-type building block approach, high-fidelity model simulation was developed for LSDYNA based on wide range experiments, ranging from quasi-static material tests component up high-velocity impact experiments. The allows prediction damage scenarios between...
Massive multiple-input multiple-output (MIMO) systems operating at millimeter-wave (mmWave) frequencies promise to satisfy the demand for higher data rates in mobile communication networks. A practical challenge that arises is calibration amplitude and phase of these massive MIMO systems, as antenna elements are too densely packed provide a separate branch measuring them independently. Over-the-air (OTA) methods viable solutions this problem. In contrast previous works, here presented OTA...
Subarray-based hybrid beamforming (SBHB) systems represent an efficient architectural solution to realize massive multiple-input multiple-output (MIMO) systems. Thereby, the is no longer realized exclusively in digital domain, but coordination with analog network by connecting each channel a dedicated number of antenna elements via phase shifters. Most estimation and algorithms for SBHB are based on beam steering approaches, demanding precise calibration network. In this letter, system...
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Subarray-based hybrid beamforming (SBHB) systems represent an efficient architectural solution to realize massive multiple-input multiple-output (MIMO) systems. Thereby, the is no longer realized exclusively in digital domain, but coordination with analog network by connecting each channel a dedicated number of antenna elements via phase shifters. Most estimation and algorithms for SBHB are based on beam steering approaches, demanding precise calibration network. In this letter, system...