Sökning: "data inversion"

Visar resultat 16 - 20 av 128 avhandlingar innehållade orden data inversion.

  1. 16. Characterization of Hydrogeological Media Using Electromagnetic Geophysics

    Författare :Niklas Linde; Laust B. Pedersen; Max A. Meju; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; Hydrogeophysics; radio magnetotellurics; ground penetrating radar; electrical resistance tomography; inversion; regularization; geostatistics; electrical anisotropy; fractured rock; Geofysik; Geophysics; Geofysik;

    Sammanfattning : Radio magnetotellurics (RMT), crosshole ground penetrating radar (GPR), and crosshole electrical resistance tomography (ERT) were applied in a range of hydrogeological applications where geophysical data could improve hydrogeological characterization. A profile of RMT data collected over highly resistive granite was used to map subhorizontal fracture zones below 300m depth, as well as a steeply dipping fracture zone, which was also observed on a coinciding seismic reflection profile. LÄS MER

  3. 17. Controlled Source Radiomagnetotelluric (CSRMT) Applications in Environmental and Resource Exploration

    Författare :Nazli Ismail; Laust Pedersen; Bulent Tezkan; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Magnetotelluric; radio magnetotelluric; controlled-source tensor magnetotelluric; plane wave; near surface geophysics; sediment; fracture zone; inversion; forward modelling; near field effect; two-dimensional model; three-dimensional model; resolution; Geophysics; Geofysik; Earth Sciences with Specialization Environmental Analysis; geovetenskap med inriktning mot miljöanalys; Hydrology; hydrologi; mineralogi; petrologi och tektonik; Mineral Chemistry; Petrology and Tectonics;

    Sammanfattning : An integrated use of radio magnetotelluric (RMT) and controlled source tensor magnetotelluric (CSTMT) measurements, the so-called CSRMT method, has been employed in environmental and resource exploration studies. A number of case histories, including a groundwater investigation in glacial deposits, a study of fracture zones for geotechnical purposes and a mining exploration study of a copper deposit, are presented in this thesis in order to illustrate the usefulness and capability of the CSRMT method. LÄS MER

  4. 18. Microwave Radiometric Observations of the Middle Atmosphere: Simulations and Inversions

    Författare :Patrick Eriksson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; atmospheric radiative transfer; middle atmosphere; sub-mm; data inversion; profile retrieval; microwaves; limb sounding; ozone; remote sensing;

    Sammanfattning : Two well-known examples of global environmental problems are the ozone depletion and the enhanced greenhouse effect. The importance and the complexity of these questions generate a demand for improved atmospheric observations, and microwave radiometry is an approach which is increasingly important for measurements of the middle atmosphere (10-100 km). LÄS MER

  5. 19. 2D and 3D Seismic Surveying at the CO2SINK Project Site, Ketzin, Germany: The Potential for Imaging the Shallow Subsurface

    Författare :Sawasdee Yordkayhun; Christopher Juhlin; Charlotte Krawczyk; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inversion; Traveltime tomography; 3D seismic surveys; Seismic velocity; Seismic source; CO2SINK project; Geophysics; Geofysik;

    Sammanfattning : Seismic traveltime inversion, traveltime tomography and seismic reflection techniques have been applied for two dimensional (2D) and three dimensional (3D) data acquired in conjunction with site characterization and monitoring aspects at a carbon dioxide (CO2) geological storage site at Ketzin, Germany (the CO2SINK project). Conventional seismic methods that focused on investigating the CO2 storage and caprock formations showed a poor or no image of the upper 150 m. LÄS MER

  7. 20. Digital Hardware Aspects of Multiantenna Algorithms

    Författare :Fredrik Edman; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Beamforming; MIMO; FPGA; Implementation; Hardware; Matrix; Inversion; QR-decomposition; SVD; Capon; Signal processing; Signalbehandling; Electronics; Elektronik och elektroteknik; Elektronik; Telecommunication engineering; Telekommunikationsteknik; Electronics and Electrical technology;

    Sammanfattning : The field of wireless communication is growing rapidly, with new requirements for the next generation of mobile and wireless communications technology. In order to achieve the capacities needed for future wireless systems, the design and implementation of advanced communications techniques such as multiantenna systems is required. LÄS MER