A5015158246- Rocket and propulsion systems research
- Spacecraft Design and Technology
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Plasma Diagnostics and Applications
- Spacecraft and Cryogenic Technologies
- Electrohydrodynamics and Fluid Dynamics
- Water Quality and Pollution Assessment
- Cryospheric studies and observations
- Computational Physics and Python Applications
- Climate change and permafrost
- Hydrology and Watershed Management Studies
- Quantum and electron transport phenomena
- Land Use and Ecosystem Services
- Advanced Combustion Engine Technologies
- Characterization and Applications of Magnetic Nanoparticles
- Gas Dynamics and Kinetic Theory
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Engineering Applied Research
- Aerospace Engineering and Control Systems
- Magnetic confinement fusion research
- Geochemistry and Geologic Mapping
- Neural Networks and Applications
- Surface and Thin Film Phenomena
Max Planck Institute for the Structure and Dynamics of Matter
2021-2024
Center for Free-Electron Laser Science
2024
Universität Hamburg
2024
University of Southampton
2021-2024
University of Potsdam
2024
Royal Devon & Exeter NHS Foundation Trust
2020
United States Fish and Wildlife Service
2017
Universität der Bundeswehr München
1995-2011
European Space Agency
2002-2010
European Space Research and Technology Centre
2004-2010
Computational micromagnetics has become an essential tool in academia and industry to support fundamental research the design development of devices. Consequently, computational is widely used community, fraction time researchers spend performing studies growing. We focus on reducing this by improving interface between numerical simulation researcher. have designed developed a human-centred environment called Ubermag. With Ubermag, scientists can control existing micromagnetic package, such...
Magnetic materials at the nanoscale are important for science and technology. A key aspect their research advancement is understanding of emerging magnetization vector field configurations within samples devices. systematic parameter space exploration—varying example material parameters, temperature, or sample geometry—leads to creation many thousands that need be sighted classified. This task usually carried out manually, by looking a visual representation configurations. We report it...
Abstract Complex magnetic materials hosting topologically non-trivial particle-like objects such as skyrmions are under intensive research and could fundamentally change the way we store process data. One important class of helimagnetic with Dzyaloshinskii-Moriya interaction. Recently, it was demonstrated that thin nanodisks consisting two layers opposite chirality can host a single stable Bloch point different types at interface between layers. Using micromagnetic simulations show FeGe...
Scientists who want to use micromagnetic simulation packages, need learn how express the problem of interest in a “language” such as configuration file, script or GUI-clicks that software understands. This language varies from software. If researchers another package, they new re-express their (unchanged) for next For research-project specific pre- post-processing, scientists often write additional We propose vision unified modeling (UMM) approach with which can once and multiple packages be...
Abstract. The Taku Glacier, Alaska has advanced 7.5 km since the late nineteenth century, while all other primary outlet glaciers of Juneau Icefield are in retreat. Research Program completed field work on Glacier annually 1946. collected observations surface mass balance, glacier velocity and thickness at Profile IV 29 above terminus 4 equilibrium line provide a means to assess nature Glacier. Annual measured summer measurements from 1950–2006 indicate insignificant variations seasonally or...
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, chemistry biology, giving researchers access X-rays with unprecedented brightness, coherence and pulse duration. All XFEL facilities built until recently provided pulses at a relatively low repetition rate, limited data statistics. Here, results the first megahertz-repetition-rate scattering experiments Spectroscopy Coherent Scattering (SCS) instrument European...
This paper reports the 1989 re-mapping of Lemon Creek Glacier, Alaska, and, in conjunction with 1948 and 1957 maps glacier, calculation 9-year 32-year changes glacier mass terminal position. As earlier maps, new map is at a scale 1:10,000 5-m contour interval for surface. Changes between were determined by use geodetic method determining balance. Net water equivalent change was -118.71 × 106 m3. The glacier's respective 1957–1989 area volume losses 0.878 m2 -131.90 m3 (14.6%). terminus...
The increasing application of microsatellites (from 10 kg up to 100 kg) for a rising number various missions requires the development suitable propulsion systems. Microsatellites have special requirements system such as small mass, reduced volume, and very stringent electrical power constraints. Existing systems often can not satisfy these requirements. present paper discusses test bipropellant thruster complying with main goal this effort was utilization ethanol in combination hydrogen...
The concept of spiking hydrocarbon fuels such as kerosenes with liquid silicon hydrides in order to render the fuel combination hypergolic and improve combustion efficiency is presented preliminarily analyzed. In view scarcity available data, various approaches are used, among them quantum-mechanical ab initio calculations for thermodynamics shock-tube measurements kinetics higher, silanes. Based on these results other performance predictions indicate that miscible hydrocarbon/silicon...
Abstract. The Taku Glacier, Alaska has advanced 7.5 km since the late nineteenth century, while all other primary outlet glaciers of Juneau Icefield are in retreat. Research Program completed field work on Glacier annually 1946. collected observations surface mass balance, glacier velocity and thickness at Profile IV 29 above terminus 4 equilibrium line provide a means to assess nature Glacier. Velocity measured over twelve month span annual summer measurements from 1950–2006 indicate...
Micro-satellites (from 10 kg up to 100 kg) have mass, volume, and electrical power constraints due their low dimensions. These limitations lead the lack in currently available active orbit control systems micro-satellites. Therefore, a micro-propulsion system with high thrust mass ratio is required increase potential functionality of small satellites. Mechatronic presently working on liquid bipropellant micro-rocket engine under contract ESA (Contract No.16914/NL/Sfe - Microturbomachinery...
A unified approach is developed to characterize and compare the most widely used two-dimensional ultrasound pulse-echo imaging procedures. The methods of monostatic, bistatic multistatic time-domain holography are theoretically investigated with regard line spread functions, resolution capabilities, effects multiple scattering object inhomogeneities. Analytical derivations computer simulations show superiority monostatic in applications such as nondestructive testing, where cases assumptions...
In past years, Amplified Piezoelectric Actuators (APA) have been applied to a variety of industrial applications that take advantage their quick response and precise positioning capabilities. More recently, APA's integrated into valve designs obtain both rapid proportional flow control. This paper presents the design measurement results two gas valves recently developed. The first uses small APA is driven by switching amplifier high frequency modulation. A modulation higher than 400Hz, along...
There is growing recognition that multispectral satellite imagery can be used to characterise the weathering state of material exposed at Earth’s surface. However, it remains unclear if and how satellite-derived indices linked, in a universal way, fundamental controls on (e.g., surface age composition, temperature, moisture availability). Here, we use Landsat-8 Operational Land Imager (OLI) reflectance 75 dated moraines, distributed throughout Central Andes between 7 27...
We report a case study where an existing materials science course was modified to include numerical simulation projects on the micromagnetic behavior of materials. The Ubermag software package is used in order solve problems computationally. controlled through Python code Jupyter notebooks. Our experience that self-paced problem-solving nature project work can facilitate better in-depth exploration contents. discuss which aspects and ecosystem have been beneficial for students' learning...
We present NeuralMag, a flexible and high-performance open-source Python library for micromagnetic simulations. NeuralMag leverages modern machine learning frameworks, such as PyTorch JAX, to perform efficient tensor operations on various parallel hardware, including CPUs, GPUs, TPUs. The implements novel nodal finite-difference discretization scheme that provides improved accuracy over traditional methods without increasing computational complexity. is particularly well-suited solving...
TASC/INFM, Sincrotrone Trieste (ELETTRA), and Mechatronic GmbH have started the design of a microturbine powered with compressed gas to be used as an electrical generator in micro/nanosatellite. The research is funded by ESA for realization liquid bipropellant micro-rocket engine that uses micro-turbine micro-pumps order pressurize propellants. turbine rotors been fabricated LIGA technology die sinking Electro Discharge Machining. well adapted production high aspect ratio microstructures...