Sökning: "Electro-magnetic techniques"

Hittade 4 avhandlingar innehållade orden Electro-magnetic techniques.

  1. 1. Investigation of the correlation of fracture frequency and electric resistivity in impact craters in crystalline rocks

    Författare :Ann Bäckström; KTH; []
    Nyckelord :Electric resistivity; Fracture frequency; Impact generated fractures; Electro-magnetic techniques; VLF-R method; MT method; Window-mapping technique; Three-dimensional fracture calculations; heat-exchange structure; geothermal energy;

    Sammanfattning : Impact craters are formed when a large meteorite or comethits the Earth. At the impact a shock wave is released causingabundant fracturing in the surrounding bedrock. This type offracturing is intense and occurs throughout a very large volume(>100 km3) of the bedrock. LÄS MER

  3. 2. Multiscale Methods for Wave Propagation Problems

    Författare :Henrik Holst; Björn Engquist; Olof Runborg; Assyr Abdulle; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Simulations of wave propagation in heterogeneous media and at high frequencies are important in many applications such as seismic-, {electro-magnetic-,} acoustic-, fluid flow problems and others. These are classical multiscale problems and often too computationally expensive for direct numerical simulation. LÄS MER

  4. 3. Assessment and control of tonal components in electric vehicles

    Författare :David Lennström; Etienne Parizet; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk akustik; Engineering Acoustics;

    Sammanfattning : New challenges arise for noise, vibration and harshness (NVH) engineers when electric motors are introduced into cars traditionally powered by internal combustion engines (ICE). The noise signature from an electric traction motor is characterized by speed-dependent high frequency tonal components due to electro-magnetic excitation. LÄS MER

  5. 4. Cooperative communication for multi-user cognitive radio networks

    Författare :Maksym Girnyk; Lars Kildehöj Rasmussen; Fredrik Rusek; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : In recent years, the main trend in wireless communications has been shifted from voice transmission to data-centric communication. This shift has caused an increase in the data rate requirements for future wireless communication systems. These requirements result in need for large bandwidth. LÄS MER