A5065975441- Soil and Unsaturated Flow
- Advanced MEMS and NEMS Technologies
- Climate change and permafrost
- Groundwater flow and contamination studies
- Soil Moisture and Remote Sensing
- Hydrology and Watershed Management Studies
- Geothermal Energy Systems and Applications
- Spacecraft and Cryogenic Technologies
- Gas Dynamics and Kinetic Theory
- Computational Fluid Dynamics and Aerodynamics
- Advanced Sensor and Energy Harvesting Materials
- Analytical Chemistry and Sensors
- Cryospheric studies and observations
- Photonic and Optical Devices
- Electromagnetic Simulation and Numerical Methods
- Acoustic Wave Resonator Technologies
- Physics and Engineering Research Articles
- Radioactive element chemistry and processing
- Semiconductor Lasers and Optical Devices
- Social and Cultural Dynamics
- Geochemistry and Geologic Mapping
- Wireless Power Transfer Systems
- Energy Harvesting in Wireless Networks
- Solid-state spectroscopy and crystallography
- Heavy metals in environment
German Environment Agency
2022-2023
Bayerisches Landesamt für Umwelt
1993-2021
Environment Agency
2012-2021
Fraunhofer Institute for Silicon Technology
1996-2017
Philips (Germany)
2017
Manchester Metropolitan University
2015
Kiel University
2015
Georg Simon Ohm University of Applied Sciences Nuremberg
2014
Evangelische Hochschule Dresden
2014
Landesamt für Umwelt
2006
The paper reports on a novel bistable electrostatic actuator with pneumatic coupling. Two buckled Si/SiO/sub 2/ membranes span over connected air filled cavities enclosed driving electrodes. operate in counteraction. If one electrode is pulled down electrostatically, the other pushed up pneumatically, and vice versa. module designed to achieve deflection of /spl plusmn/10 mu/m will be integrated microvalve for liquids. With first completed modules electrostatic/pneumatic principle could...
Low-cost automotive laser scanners for environmental perception are needed to enable the integration of advanced driver assistant systems into all vehicle segments, which is a key reduce number traffic accidents on roads. Within scope European-funded project MiniFaros, partners from five different countries have been cooperating in developing small-sized low-cost time-of-flight-based range sensor. An omnidirectional 360-deg scanning concept has developed based combination an lens and biaxial...
Abstract The thermal conductivity ( λ ) of soils is an important property in a variety science and engineering applications. One the most widely used models soil was proposed by de Vries deV‐0) . This model complicated difficult to use as it based on several controversial assumptions. deV‐0 assumes that system composed non‐contacting solid particles (rotated uniform ellipsoids) are dispersed continuous homogeneous medium (air or water). Furthermore, solids consist quartz consolidated bulk...
Three predictive models are tested against soil thermal conductivity data at high temperatures: two (deV-1 and deV-2) modifications of the original de Vries model, third is Gori model. Model deV-1 results correlated very closely for 30, 50 70°C, moderately close 90°C. Generally, this model does not require use a mass transfer enhancement factor. The well 30 50°C. deV-2 correlate above field capacity, provide best predictions full dryness. recommended computer modelling heat moisture movement...
Results from a user friendly, menu-driven, and interactive computer program for rapid estimation of thermal properties soils are presented. The model developed is an extension the de Vries approach. new allows easy conductivity with approximately log-normal particle-size distribution. introduces individual characteristics five main mineral soil constituents (i.e., quartz, feldspar, calcite, clay minerals, mica) relates their occurrence in to grain-size also has possibility inserting up 20...
In this article we discuss what Pierre Bourdieu’s concept of habitus can add to psychologically informed debates around social class. We argue that offers a way coming terms with the complexity and different dimensions For Bourdieu, conceptualises internalisation structures, how “outer” becomes “inner.” This distinct psychological question is critical for “psychoanalysis social.” ties in views on classed existence, but also function as tool further studies by suggesting broader focus...
This paper describes a mathematical model for predicting the hydraulic conductivity of partially frozen soils on basis limited input data such as grain size distribution and bulk density or porosity. A new is based an analogy unfrozen models estimation properties water content. Campbell's was used prediction soil-water characteristics from data, while content obtained two (by P.J. Williams D.M. Anderson) applied to different temperature ranges. The can be rapid practically any freezing soil...
GWML2 is an international standard for the online exchange of groundwater data that addresses problem heterogeneity. This makes hard to find and use because are diversely structured fragmented into numerous silos. Overcoming heterogeneity requires a common format; however, until development GWML2, appropriate has been lacking. represents key hydrogeological entities such as aquifers water wells, well related measurements flows. It developed tested by consortium providers from North America,...
Abstract Eight pedotransfer functions (PTF) originally calibrated to soil data are used for evaluation of hydraulic properties soils and deeper sediments. Only PTFs considered which had shown good results in previous investigations. Two sets were this purpose: a set measured pressure heads vs. water contents 347 horizons (802 pairs) from Bavaria (Southern Germany) 39 undisturbed samples tertiary sediments ground (down 100 m depth) the molasse basin north Alps, containing 840 head unsaturated...
Small size, low power consumption and the capability to produce sharp images without need of an objective make MEMS scanning laser based pico-projectors attractive solution for embedded cell-phone projection displays. To fulfil high image resolution demands mirror has show large scan angles, a aperture size frequency. An additional important requirement in pico-projector applications is minimize scanner enable long video time. Typically losses are caused by gas damping. For that reason...
Real gas effects in cryogenic nitrogen flows have been calculated using the Beattie-Bridgeman equation of state. The investigations include Prandtl-Meyer expansions; oblique shocks, transonic small perturbation theory, flow past a NACA 0012 aerofoil, and shock-wave/boundary-layer interaction. last two cases mentioned treated with aid finite volume techniques. results show som noticeable deviations from behavior an ideal gas, not only at conditions but also normal temperatures high pressures....
This paper presents modeling, fabrication and characterization of two designs two-axis gimbal-less, thin-film PZT driven micromirrors with 1mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> apertures. These reach high frequencies for piston (21 kHz) torsional modes (28.9 the θ <sub xmlns:xlink="http://www.w3.org/1999/xlink">opt</sub> · D product achieves up to 20.7°·mm by a unipolar rectangular pulse 10 V. The combination frequency...
The capabilities of a set finite-difference codes, based on the finite-integration technique (FIT), for solving Maxwell's equations have been examined. Each Maxwell is separately discretized to produce an equivalent matrix equation. In this way, problems from very broad area physics and engineering can be solved by method which not only produces unique, physical solutions, but in divergence are also satisfied. With 60-204 bytes per mesh cell six unknowns cell, it possible calculate large...
This paper presents the first piezoelectric MEMS energy-harvester with monolithically integrated fully back-end-of-line compatible high-energy-density micromagnets. At resonance a power output of up to 20 μW is reported which by orders magnitude higher than state-of-the-art magnetic harvesters. Due high energy density and large volume micromagnets harvester exhibits area-normalized about 5 μW/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .