The Open Geospatial Consortium (OGC) addresses the requirement of integrating sensor information into spatial information infrastructures by developing service interfaces, protocols and data types in the Sensor Web Enablement (SWE) specification series. Using web-based services as tools for interdisciplinary data exchange, as well as for the extensive usage of heterogeneous data resources is an important step towards addressing today’s larger scale environmental problems (Bacharach, 2008). By making measurements and results discoverable and accessible over the...
Surface and Wetting Properties of Diagenetic Minerals and Sedimentary Grains in Reservoir Rocks (NanoPorO)W. Altermann, T. Drobek, M. Frei, W. M. Heckl, M. Kantioler, K. I. Phuong, R. W. Stark & J. Strobel
Current secondary oil recovery measures allow for the recovery of a maximum of about 33 % of the oil in a reservoir. The remaining almost two third of the energy carrier are lost due to decreasing pressure, pore blocking, water inva- sion or hydrocarbon fluid adhesion to the rock. Therefore, fluids weakening the adhesion of hydrocarbons to pore walls and increasing permeability of the rock by e.g. mineral cement dissolution, are injected to the deposits...
InProTunnel : Interfacial Processes between Mineral and Tool Surfaces - Causes, Problems and Solutions in Mechanical Tunnel DrivingM. Feinendegen, G. Spagnoli, H. Stanjek, H. P. Neher, R. Ernst, M. Weh, T. M. Fernández-Steeger, M. Ziegler & R. Azzam
During mechanical tunnel driving in fine grained soil or rock the excavated material often sticks to the cutting tools or conveying system, which may cause great difficulties in its excavation and transport. In the InProTunnel project this problem is faced on different scales particularly for the method of Earth Pressure Balanced (EPB) shield tunnelling. Major influences from tunnel boring machine (TBM) operation are identified by project data analyses, clogging propensity is evaluated by a new...
SIMSAN - Simulation-supported development of process-stable raw material components and suspensions for the production of ceramic sanitary ware on the basis of modified mineral surfacesM. Engels, T. Agné, E. Bayard, R. Diedel, H. Emmerich, K. Emmerich, S. Haas, O. Latief, M. Peuker, A. Steudel, A. Vuin & H. Yang
The article focuses on the status of the research after the second project year. In addition to the basic characterisation of the chosen reference material mixture for sanitary slip casting, as presented in previous publications for the Geotechnologien Science Reports, it focuses especially on the characterisation results of the basic raw material components, which in the second year of the project were investigated. These are the basis for the funtional characterisation of novel body concepts...
Control mechanisms of clays and their specific surface area in growing media – assessment of clay properties and their parametrization for the optimization of plant qualityS. Dultz, M. Schellhorn, G. Schmilewski, M. K. Schenk, I. Dombrowski, E. Schmidt, J. Walsch & M. Below
The addition of clay to growing media aims at constant supply of potassium, phosphorus and micro nutrients, pH-buffering, improvement of rewettability, and cohesion of growing media. The identification of suitable clays and their classification is a prerequisite for product and cultivation safety. A range of different clays highly variable in their mineral parameters were selected for experiments on nutrient buffering (P) and Mn toxicity, their ability to improve the rewettability and binding capacity of growing...
SURFTRAP - Development and Optimisation of a Process to Biosynthesize Reactive Iron Mineral Surfaces for Water Treatment PurposesS. Peiffer, S. Paikaray, C. Damian, E. Janneck, S. Ehinger, M. Martin, M. Schlömann, C. Wiacek, J. Kipry, W. Schmahl, R. Pentcheva, K. Otte, A. Götz, Z. Wang, K. Hsieh, J. Meyer, G. Schöne, T. Koch, A. Ziegler & D. Burghardt
In this project we aim to develop a low-cost technology to remove ionic constituents from raw waters such as arsenic species. The proposed technology is based on the reactivity of schwertmannite, an oxyhydroxosulfate of the mean stochiometry Fe8O8(OH)6SO4 (molar mass 772.89 g/mol). This mineral typically forms in acidic and sulfate rich mine waters as a secondary mineral upon oxidation of Fe(II) in a biologically mediated process. Schwertmannite can be generated in a biotechnological process after...
The International Geomagnetic Reference Field (IGRF) is a very frequently used model of the Earth’s main magnetic field by both the science community and the industry. This model is updated every five years. We present here the second generation of the GRIMM magnetic field model that was derived to contribute to the IGRF-11. The model has been developed from a newly, reprocessed CHAMP satellite data set covering nearly 10 years. It has a temporal and...
In our approach to gravity field determination, the GOCE data are processed sequentially on aparallel computer system, iteratively via application of the method of preconditioned conjugate gradient multiple adjustment (PCGMA), and in situ via development of the functionals at the actual location and orientation of the gradiometer. GOCE gradiometry (SGG) data are auto-correlated in their three components Vxx, Vyy and Vzz so that one purpose of PCGMA is the adjustment of the unknown stochastic model...
GLObal gravity field determination with REgional refinements by the analysis of GOCE level-1b data (GLOREGOCE)A. Shabanloui, J. Schall, T. Mayer-Gürr, A. Eicker, Jürgen Kusche & E. Kurtenbach
The Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) is characterized bythe fact that the GOCE satellite flies in an extremely low near polar orbit of 260 km altitude.The pure free fall motion is permanently maintained by a feedback system for compensatingthe surface forces acting on the GOCE. Based on high-low Satellite to Satellite Tracking (hl-SST) observations, orbit of GOCE can be estimated with an accuracy of 2-3 cm. The global and regional Earth’s gravity...
The application of accelerometers for gravity missions is assessed within a system framework. Several questions concerning the accelerometer impact on the science performance are discussed. Is the accelerometer noise performance balanced with the performance of the SST-link me trology? Is its measurement range compatible with the system properties? How accurate must the sensor be placed with respect to the spacecraft center of mass? And finally, would it be po s sible to use the accelerometer...
This report presents an overview of the status of the ongoing research and development of laser interferometry for future satellite gravimetry missions at the Albert-Einstein-Institutein Hannover, Germany.
We report on our development of various kinds of quantum sensors based on matterwave interferometry for precise inertial sensing of Earth`s rotation rate and gravity. By manipulating cold or ultra cold atoms with coherent light fields we realize several experimental platforms for the detailed investigation of different interferometer types and of their key technologies. In an atomic gyroscope using cold Rubidium atoms we demonstrate a sensitivity for rotations of 6x10-7 rad/s. In an atomic gravimeter,...
Continuous monitoring of fracturing processes in mine environments and the consequent characterization of the damage induced during mining exploitation is of primary interest both for mining engineering and civil protection. The development of improved monitoring and imaging methods is of great importance for salt mines as potential reservoirs for CO2 sequestration. Imaging tools able to handle continuous data streams and providing fast reliable information about stress perturbations and fracturing state will offer important new information...
Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences329
Helmholtz Association of German Research Centres133
GEOMAR Helmholtz Centre for Ocean Research Kiel33
Karlsruhe Institute of Technology25
Alfred Wegener Institute for Polar and Marine Research17
Helmholtz Centre for Environmental Research12
Federal Institute for Geosciences and Natural Resources12
Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research10
University of Potsdam7