A5006020368- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Forest ecology and management
- Remote Sensing and LiDAR Applications
- Quantum, superfluid, helium dynamics
- Landslides and related hazards
- Cryospheric studies and observations
- Cold Atom Physics and Bose-Einstein Condensates
- Groundwater flow and contamination studies
- Graphite, nuclear technology, radiation studies
- Radioactivity and Radon Measurements
- Nuclear and radioactivity studies
- Advanced Condensed Matter Physics
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Nuclear physics research studies
- Forest Ecology and Biodiversity Studies
- Geomagnetism and Paleomagnetism Studies
- Peatlands and Wetlands Ecology
- earthquake and tectonic studies
- Quantum Information and Cryptography
- Hydrology and Watershed Management Studies
- Physics of Superconductivity and Magnetism
- Strong Light-Matter Interactions
Friedrich-Alexander-Universität Erlangen-Nürnberg
2020-2024
Federal Office for the Environment
2007-2021
University of Bern
2003-2007
Amt für Umwelt
2007
University of Bayreuth
1998
Within extending urban areas, trees serve a multitude of functions (e.g. carbon storage, suppression air pollution, mitigation the 'heat island' effect, oxygen, shade and recreation). Many these services are positively correlated with tree size structure. The quantification above-ground biomass (AGB) is especial importance to assess its storage potential. However, AGB difficult allometries applied often based on forest trees, which subject very different growing conditions, competition form....
Abstract. We present the first high-resolution (500 m × 500 m) gridded methane (CH4) emission inventory for Switzerland, which integrates 90 % of national totals reported to United Nations Framework Convention on Climate Change (UNFCCC) and recent CH4 flux studies conducted by research groups across Switzerland. In addition anthropogenic emissions, we also include natural semi-natural fluxes, i.e., emissions from lakes reservoirs, wetlands, wild animals as well uptake forest soils. National...
The critical breakdown of a one-dimensional quantum magnet with long-range interactions is studied by investigating the high-field polarized phase anisotropic XY model in transverse field for ferromagnetic and antiferromagnetic cases. While limiting case isotropic we can extract elementary one-quasiparticle dispersion analytically calculate two-quasiparticle excitation energies quantitatively numerical fashion, Ising limit as well intermediate regime use perturbative continuous unitary...
We investigate classes of interacting quantum spin systems in a single-mode cavity with Dicke coupling, as paradigmatic example strongly correlated light-matter systems. Coming from the limit weak couplings and large number matter entities, we map relevant low-energy sector broad class models non-superradiant phases onto exactly solvable model. apply outcomes to Dicke-Ising model [Phys. Rev. Res. 2, 023131 (2020), Sci. Rep. 4, 4083 (2014)], agreement results obtained by mean-field theory...
Trees outside forest (TOF) can perform a variety of social, economic and ecological functions including carbon sequestration. However, detailed quantification tree biomass is usually limited to areas. Taking advantage structural information available from stereo aerial imagery airborne laser scanning (ALS), this research models using national inventory data linear least-square regression applies the model both inside create nationwide for (above ground below ground). Validation against TOF...
The established approach of perturbative continuous unitary transformations (pCUTs) constructs effective quantum many-body Hamiltonians as series that conserve the number one quasiparticle type. We extend pCUT method to similarity transformations---dubbed ${\text{pcst}}^{++}$---allowing for multiple types with complex-valued energies. This enlarges field application closed and open systems unperturbed operators corresponding arbitrary superimposed ladder spectra. To this end, a generalized...
Abstract. We present the first high-resolution (500 m × 500 m) gridded methane (CH4) emission inventory for Switzerland, which integrates national totals reported to United Nations Framework Convention on Climate Change (UNFCCC) and recent CH4 flux studies conducted by research groups across Switzerland. In addition anthropogenic emissions, we also include natural semi-natural fluxes, i.e., emissions from lakes reservoirs, wetlands, wild animals as well uptake forest soils. National were...
We investigate the dynamic structure factor of antiferromagnetic Kitaev honeycomb model in a magnetic field by applying perturbative continuous unitary transformations about high-field limit. One- and two-quasiparticle properties dressed elementary spin-flip excitations polarized phase are calculated, which account for most spectral weight factor. discuss evolution features these quasiparticle sectors terms one-quasiparticle dispersions, continua, formation antibound states, decay. In...
We investigate classes of interacting quantum spin systems in a single-mode cavity with Dicke coupling, as paradigmatic example strongly correlated light-matter systems. Coming from the limit weak couplings and large number matter entities, we map relevant low-energy sector broad class models onto exactly solvable model. apply outcomes to Dicke-Ising model example, agreement results obtained by mean-field theory. further accompany verify our findings finite-size calculations, using exact...
Abstract. Durch den Mangel an Langzeitklimaarchiven sind der Quartärforschung in Südamerika Grenzen auferlegt. Eine prominente Ausnahme stellt die 50 m mächtige Löss-Paläoboden-Sequenz Las Carreras im Becken von Tafí (nordwestargentinische Anden) dar, 32 Feuchtphasen vergangenen 1.2 Ma dokumentiert. Die Region liegt Einflussgebiet des südamerikanischen Monsunsystems (SAMS) mit dominierenden Sommerregen. Im trockenen Winterhalbjahr führen selektive, topographisch vorgegebenen Pfaden folgende...
<p>Trees supply a multitude of ecosystem services (e.g. carbon storage, suppression air pollution, oxygen, shade, recreation etc.) not only in forested areas but also urban landscapes. Many these are positively correlated with tree size and structure. The assessment storage potential via the quantification above ground biomass (AGB) is special importance. However, AGB difficult applied allometries often based on forest trees, which subject to very different growing conditions,...