Search for dissertations about: "anomalous resistivity"

Showing result 1 - 5 of 11 swedish dissertations containing the words anomalous resistivity.

  2. 1. Resistivity investigation and monitoring for detection of internal erosion and anomalous seepage in embankment dams

    Author : Pontus Sjödahl; Teknisk geologi; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hydrogeologi; teknisk geologi; internal erosion; Hydrogeology; geographical and geological engineering; time-lapse inversion; inversion; monitoring; modelling; resistivity; detection; leakage; seepage; teknisk geografi; embankment dam;

    Abstract : Methods for monitoring seepage and detecting internal erosion are essential for the safety evaluation of embankment dams. Internal erosion is one of the major reasons for embankment dam failures, and there are several tenths of thousands of large embankment dams in the world. READ MORE

  4. 2. Plasma cloud penetration across magnetic boundaries

    Author : Tomas Hurtig; KTH; []
    Keywords : Laboratory plasma experiments; Particle in cell simulation; Anomalous resistivity; Fast magnetic field diffusion; Anomalous particle transport;

    Abstract : .... READ MORE

  5. 3. Cluster Observations and Theoretical Explanations of Broadband Waves in the Auroral Region

    Author : Marie Backrud; Jan-Erik Wahlund; Mats André; David Knudsen; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; ion acoustic waves; auroral region; anomalous resistivity; Cluster; Rymd- och plasmafysik; Space physics; Rymdfysik;

    Abstract : Broadband extremely low-frequency wave emissions below the ion plasma frequency have been observed by a number of spacecraft and rockets on auroral field lines. The importance of these broadband emissions for transverse ion heating and electron acceleration in the auroral regions is now reasonably well established. READ MORE

  6. 4. Monitoring of tailings dams with geophysical methods

    Author : Ganesh Mainali; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Abstract : Several dam failure accidents have occurred during the last years and mine tailings dam failures are occurring at relatively high rates. Studies of past earth dam failures show embankment dam problems and failures are often related to internal erosion in one way or another. READ MORE

  7. 5. Three-dimensional forward modelling and inversion of controlled-source electromagnetic data using the edge-based finite-element method

    Author : Paula Rulff; Thomas Kalscheuer; Michael Becken; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Applied geophysics; Controlled-source electromagnetics; Numerical modelling; Finite-element method; Geophysical inversion; Geofysik med inriktning mot fasta jordens fysik; Geophysics with specialization in Solid Earth Physics;

    Abstract : Electromagnetic geophysical methods are applied to investigate anomalous subsurface structures exhibiting contrasts in electrical resistivity, as for example in mineral exploration or geothermal areas. When evaluating electromagnetic data, one big challenge is to account for full three-dimensional measurement setups and subsurface scenarios. READ MORE