A5019657624- Astro and Planetary Science
- Planetary Science and Exploration
- Space Satellite Systems and Control
- Stellar, planetary, and galactic studies
- Spacecraft Dynamics and Control
- Spacecraft and Cryogenic Technologies
- Nuclear Physics and Applications
- High Altitude and Hypoxia
- Astrophysics and Star Formation Studies
- Isotope Analysis in Ecology
- Seismology and Earthquake Studies
- Inertial Sensor and Navigation
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Flood Risk Assessment and Management
- Fluid Dynamics and Turbulent Flows
- Heat Transfer Mechanisms
- Artificial Intelligence in Healthcare and Education
- Space exploration and regulation
- Anomaly Detection Techniques and Applications
- High-pressure geophysics and materials
- Geomagnetism and Paleomagnetism Studies
- Hydrological Forecasting Using AI
- Geological and Geochemical Analysis
- Vehicular Ad Hoc Networks (VANETs)
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2020-2025
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2010-2023
University of Potsdam
2019
Planet
2017-2018
GFZ Helmholtz Centre for Geosciences
2018
Planetary Science Institute
2014
University of Bremen
2006
Thermal and mechanical material properties determine comet evolution even solar system formation because comets are considered remnant volatile-rich planetesimals. Using data from the Multipurpose Sensors for Surface Sub-Surface Science (MUPUS) instrument package gathered at Philae landing site Abydos on 67P/Churyumov-Gerasimenko, we found diurnal temperature to vary between 90 130 K. The surface emissivity was 0.97, local thermal inertia 85 ± 35 J m(-2) K(-1)s(-1/2). MUPUS probe did not...
The structure of the upper layer a comet is product its surface activity. Rosetta Lander Imaging System (ROLIS) on board Philae acquired close-range images Agilkia site during descent onto 67P/Churyumov-Gerasimenko. These reveal photometrically uniform covered by regolith composed debris and blocks ranging in size from centimeters to 5 meters. At highest resolution 1 centimeter per pixel, appears granular, with no apparent deposits unresolved sand-sized particles. thickness varies across...
The physical properties of cometary nuclei observed today relate to their complex history and help constrain formation evolution. In this article, we review some the main focus in particular on thermal, mechanical, structural dielectric properties, emphasizing progress made during Rosetta mission. Comets have a low density 480 $\pm$ 220 kg m-3 permittivity 1.9 - 2.0, consistent with high porosity 70 80 %, are weak very global tensile strength $<$100 Pa, bulk thermal inertia 0 60 J K-1 m-2...
Artificial intelligence can enhance our ability to manage natural disasters. However, understanding and addressing its limitations is required realize benefits. Here, we argue that interdisciplinary, multistakeholder, international collaboration needed for developing standards facilitate implementation.
Abstract Among natural hazards, floods pose the greatest threat to lives and livelihoods. To reduce flood impacts, short-term forecasting can contribute early warnings that provide communities with time react. This manuscript explores how machine learning (ML) support forecasting. Using two methods [strengths, weaknesses, opportunities, threats (SWOT) comparative performance analysis] for different forecast lead times (1–6, 6–12, 12–24, 24–48 h), we evaluate of models in 94 journal papers...
Recent improvements in three techniques for measuring skin friction two- and three- dimensional turbulent wall-bounded shear flows are presented. The are: oil-film interferometry, hot wires mounted near the wall, surface hot-film sensors based on MEMS technology. First, we demonstrate that interferometry technique can be used to measure magnitude its direction three-dimensional flows. results also accurate measurements of mean with possible. Second, fluctuating is measured boundary layers...
The MASCOT radiometer MARA on board the Hayabusa2 mission will measure surface brightness temperatures of asteroid (162173) Ryugu in six wavelength bands. Here we present a method to constrain thermophysical properties from measurements. Moreover, uncertainties when determining thermal inertia as well emissivity are estimated. Using data all filters and assuming constant emissivity, homogeneous can be determined with an uncertainty range 250 ±16 Jm−2K−1s−1/2, while is below 6%. Similar...
ABSTRACT Deriving thermophysical properties such as thermal inertia from infrared observations provides useful insights into the structure of surface material on planetary bodies. The estimation these is usually done by fitting temperature variations calculated models to observations. For multiple free model parameters, traditional methods least-squares or Markov chain Monte Carlo become computationally too expensive. Consequently, simultaneous several together with their corresponding...
Roadways are critical infrastructure in our society, providing services for people through and between cities. However, they prone to closures disruptions, especially after extreme weather events like hurricanes. At the same time, traffic flow data a fundamental type of information any transportation system. In this paper, we tackle problem sensor placement on roadways address two tasks at time. The first task is estimation ordinary situations, which vital monitoring city planning. We design...
On 2014 November 12 Rosetta's comet lander Philae arrived on the surface of Comet 67P/Churyumov-Gerasimenko. Among data collected by instruments board are images from panorama camera CIVA and down looking ROLIS, as well temperature measurements recorded sensors MUPUS experiment various housekeeping sensors. In combination with remote observations cameras OSIRIS NAVCAM other Rosetta Orbiter, it was possible to construct a reasonable model terrain in close vicinity landing site Abydos. We have...
Artificial intelligence applied in disaster management must be reliable, accurate, and, above all, transparent. But what does transparency AI mean, why do we need it, and how is it achieved?
The application of modeling and simulation in the design, development validation process complex systems has significantly increased last decades. Creating high quality models is a time-consuming task. Particularly, if should be shared reused future projects. In this paper, results project Simulation Model Library (SimMoLib) are presented that address issues concerning preservation knowledge lies within calculation models. SimMoLib provides guidelines best practices to help developer prepare...
In a collaborative research effort between the German Aerospace Center and of Applied Space Technology Microgravity, University Bremen, high performance satellite dynamics simulator (HPS) is being developed. The assembled as library simulation modules, functions utilities, thematically grouped into sub-libraries. single sub-libraries contain modules for dynamics, environmental models calculation gravity, atmosphere, magnetic field, solar pressure, eclipse, ephemerides, preprocessing tools...
A method is presented for efficiently calculating surface temperatures highly resolved celestial body shapes.A thorough investigation of the necessary conditions leading to reach model convergence shows that speed temperature depends on factors such as quality initial boundary conditions, thermal inertia, illumination and resolution numerical depth grid.The optimization process shorten simulation time while increasing or maintaining accuracy results includes introduction facet-specific...
Correction to: Space Sci. Rev. (2019) 215: 29 The article Thermal, Mechanical, Structural, and Dielectric Properties of Cometary Nuclei After Rosetta, written by Groussin et al., was originally published electronically on the publisher's internet portal (currently SpringerLink) 2 May 2019 without open access. With author(s)' decision to opt for Open Choice copyright changed © Author(s) is forthwith distributed under terms Creative Commons Attribution 4.0 International License (...