A5090222389- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- CO2 Sequestration and Geologic Interactions
- Hydraulic Fracturing and Reservoir Analysis
- Atmospheric and Environmental Gas Dynamics
- NMR spectroscopy and applications
- Seismic Imaging and Inversion Techniques
- Advanced MRI Techniques and Applications
- Spacecraft and Cryogenic Technologies
- Drilling and Well Engineering
- Carbon Dioxide Capture Technologies
- Advanced NMR Techniques and Applications
- Crystallography and Radiation Phenomena
- Body Composition Measurement Techniques
- Advanced Electron Microscopy Techniques and Applications
- Diet and metabolism studies
- Microplastics and Plastic Pollution
- Adipose Tissue and Metabolism
- Advanced X-ray Imaging Techniques
- Distributed and Parallel Computing Systems
- Characterization and Applications of Magnetic Nanoparticles
- Marine and environmental studies
- Nutritional Studies and Diet
- Nutrition and Health in Aging
- Recycling and Waste Management Techniques
GEOMAR Helmholtz Centre for Ocean Research Kiel
2010-2021
University of Lübeck
2008-2010
University Hospital Schleswig-Holstein
2008-2010
Kiel University
2008-2009
Merck & Co., Inc., Rahway, NJ, USA (United States)
2009
Universität Ulm
2001-2007
Schmerzklinik Kiel
2007
Deutsches Elektronen-Synchrotron DESY
1999-2000
Universität Hamburg
1998
Objective: To compare body composition determined by bioelectrical impedance (BIA) consumer devices against criterion estimates whole magnetic resonance imaging (MRI) and dual energy X-ray absorptiometry (DXA) in healthy normal weight, overweight obese adults. Methods: In 106 adults (54 females, 52 males, age 54.2 ± 16.1 years, BMI 25.8 4.4 kg/m2) fat mass (FM), skeletal muscle (SM), total bone-free lean (TBBLM), level of visceral (VF) were estimated 3 single-frequency bipedal (foot-to-foot)...
Abstract The fate of plastic debris entering the oceans is largely unconstrained. Currently, intensified research devoted to abiotic and microbial degradation floating near ocean surface for an extended period time. In contrast, impacts environmental conditions in deep sea on polymer properties rigidity are virtually unknown. Here, we present unique results items identified have been introduced into deep-sea sediments at a water depth 4150 m eastern equatorial Pacific Ocean more than two...
Carbon capture and storage (CCS) is a key technology to reduce carbon dioxide (CO2) emissions from industrial processes in feasible, substantial, timely manner. For geological CO2 be safe, reliable, accepted by society, robust strategies for leakage detection, quantification management are crucial. The STEMM-CCS (Strategies Environmental Monitoring of Marine Capture Storage) project aimed provide techniques understanding enable inform cost-effective monitoring CCS sites the marine...
The recovery of natural gas from CH4-hydrate deposits in sub-marine and sub-permafrost environments through injection CO2 is considered a suitable strategy towards emission-neutral energy production. This study shows that the hot, supercritical particularly promising. addition heat triggers dissociation while CO2, once thermally equilibrated, reacts with pore water retained reservoir as immobile CO2-hydrate. Furthermore, optimal conditions pressure temperature are constrained. Experiments...
Superparamagnetic iron-oxide particles (SPIO) are used in different ways as contrast agents for magnetic resonance imaging (MRI): Particles with high nonspecific uptake required unspecific labeling of phagocytic cells whereas those that target specific molecules need to have very low cellular uptake. We compared core materials (magnetite, maghemite), coatings (none, dextran, carboxydextran, polystyrene) and hydrodynamic diameters (20–850 nm) internalization kinetics, release internalized...
Abstract We assessed the abundance of microplastics (0.2–5 mm) in drift line sediments from three sites Kiel Fjord, Western Baltic Sea. The first site is intensively used by beach visitors, second close proximity to a sewage plant and third polluted with large-sized plastic litter. Samples were split into grain size classes (0.2–0.5, 0.5–1, 1–5 mm), washed calcium chloride solution, filtered at 0.2 mm. Filters then visually inspected, total 180 fragments was classified as microplastics,...
Abstract Transport of fluids in gas hydrate bearing sediments is largely defined by the reduction permeability due to crystals pore space. Although exact knowledge behavior as a function saturation crucial importance, state‐of‐the‐art simulation codes for production scenarios use theoretically derived equations that are hardly backed experimental data. The reason insufficient validation model difficulty create have undergone formation mechanisms equivalent natural process and well‐defined...
A theoretical treatment of atomic holography with x rays, taking into account the vectorial nature electromagnetic waves is described. Direct and reciprocal are compared put context x-ray crystallography Kossel technique. The results to experimental data on Cu${}_{3}$Au.
Pericardial adipose tissue (PAT) is positively associated with fatty liver and obesity-related insulin resistance. Because PAT a well-known marker of visceral adiposity, we investigated the impact weight loss on its relationship fat sensitivity independently body distribution. Thirty overweight nondiabetic women (BMI 28.2-46.8 kg/m(2), 22-41 years) followed 14.2 ± 4-weeks low-calorie diet. PAT, abdominal subcutaneous (SAT), volumes (VAT) were measured by magnetic resonance imaging (MRI),...
Evaluation of seismic reflection data has identified the presence fluid escape structures cross-cutting overburden stratigraphy within sedimentary basins globally. Seismically-imaged chimneys/pipes are considered to be possible pathways for flow, which may hydraulically connect deeper strata seabed. The properties migration through must constrained enable secure, long-term subsurface carbon dioxide (CO2) storage. We have investigated a site natural active in North Sea, Scanner pockmark...
Abstract The presence of gas hydrates (GHs) increases the stiffness and strength marine sediments. In elasto‐plastic constitutive models, it is common to consider GH saturation ( S h ) as key internal variable for defining contribution GHs composite soil mechanical behavior. However, stress‐strain behavior GH‐bearing sediments (GHBS) also depends on microscale distribution GH‐sediment fabrics. A thorough analysis GHBS difficult, because there no unique relation between morphology. To improve...
Multiple spin echoes arise after “nonlinear” evolution of coherences in the presence modulated demagnetizing fields. Such modulations can be prepared, for example, with aid a sequence two 90° radio-frequency pulses pulsed or steady field gradients. The echo amplitudes are sensitively attenuated by translational diffusion so that diffusivities determined on this basis. Homo- and heteronuclear variants multiple-echo pulse sequences considered here. A formalism based Bloch/Torrey equations is...
The "guest exchange" of methane (CH4) by carbon dioxide (CO2) in naturally occurring gas hydrates is seen as a possibility to concurrently produce CH4 and sequester CO2. Presently, process evaluation based on CH4–CO2 exchange yields small- or medium-scale laboratory experiments, mostly neglecting mass heat transfer processes. This work investigates efficiencies two large-scale experiments (210 L sample volume) using fully water-saturated, natural reservoir conditions hydrate saturation 50%....
We report a pure direct x-ray-fluorescence holography measurement. It allows straightforward data evaluation and quantitative analysis of the reconstructed atomic images. The experimental hologram bcc Fe single crystal recorded with $K\ensuremath{\alpha},\ensuremath{\beta}$ lines is presented together its three-dimensional reconstruction. An isotropic spatial resolution obtained by using symmetry information from measured Kossel lines. fluorescence emitter atom images neighbors in volume...
X-ray atomic resolution holography is a new method for direct evaluation of three-dimensional electron density distribution in solids. The practical implementation the multiple-energy technique on synchrotron radiation source as well image reconstruction from experimental data are described. Holograms at several different energies were processed together to suppress twin images and artifacts long-range-order effects sets. Reconstructed copper atoms Cu 2 O crystals presented.