Sökning: "Anomalous resistivity"

Visar resultat 1 - 5 av 10 avhandlingar innehållade orden Anomalous resistivity.

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

    Författare :Pontus Sjödahl; Teknisk geologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 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;

    Sammanfattning : 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. LÄS MER

  2. 2. Plasma cloud penetration across magnetic boundaries

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

    Sammanfattning : .... LÄS MER

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

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

    Sammanfattning : 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. LÄS MER

  4. 4. Monitoring of tailings dams with geophysical methods

    Författare :Ganesh Mainali; Luleå tekniska universitet; []

    Sammanfattning : 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. LÄS MER

  5. 5. Seepage monitoring in embankment dams

    Författare :Sam Johansson; KTH; []
    Nyckelord :;

    Sammanfattning : Internal erosion, which is one of the major reasons forembankment dam failure, causes an increased seepage flow due toloss of fines. A seepage measuring system is therefore a vitalpart of an embankment dam’s monitoring system. Manyexisting seepage monitoring systems are not however sensitiveenough to detect small changes in the seepage flow. LÄS MER