Sökning: "multi-layer structure"

Visar resultat 1 - 5 av 18 avhandlingar innehållade orden multi-layer structure.

  1. 1. Micro-Structure Modelling of Acoustics of Open Porous Material

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Eva Lundberg; KTH.; [2016]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; acoustics; porous material; flow resistivity; micro-structure; anisotropic; foam; strut; Farkostteknik; Vehicle and Maritime Engineering;

    Sammanfattning : Transportation is a large and growing part of the world’s energy consumption. This drives a need for reduced weight of rail vehicles, just as it does for road vehicles. In spite of weight reductions, the vehicle still has to provide the same level of acoustic comfort for the passengers. LÄS MER

  2. 2. Electronic Transport in Materials

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Velimir Meded; Uppsala universitet.; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Electronic Structure; Ab initio; Condensed Matter Theory; Hydrogen; Boltzmann Transport Equation; Magnetism; Alloys; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Sammanfattning : Transport properties within the Boltzmann transport equation for metallic multi-layer structures as well as bulk materials, were the prime topic of this work. Ab initio total energy calculations for Hydrogen loaded metallic multi-layers were performed in order to shed some light onto problem of H depleted layers at the interfaces that have been experimentally observed. LÄS MER

  3. 3. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Ulf Carlberg; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cavity; spectral domain method; cylindrical structure; Ewald summation; Green s function; absorption cross section; moment method; reverberation chamber; antenna;

    Sammanfattning : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberationchambers, and a study of antennas in cylindrical structures.The reverberation chamber is a metal cavity for measuring antennas and other devices. LÄS MER

  4. 4. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Ulf Carlberg; [2006]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; antenna; spectral domain method; reverberation chamber; Ewald summation; moment method; cavity; cylindrical structure; Green s function; absorption cross section;

    Sammanfattning : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberation chambers and a study of antennas in cylindrical structures.The reverberation chamber is a metal cavity for measuring antennas and other devices. LÄS MER

  5. 5. Materials Engineering Using Density Functional Theory

    Detta är en avhandling från Stockholm : Materialvetenskap

    Författare :Adrian Taga; KTH.; [2004]
    Nyckelord :condensed matter; electricity and magnetism;

    Sammanfattning : This doctoral thesis presents density functionalcalculations applied in several domains of interest in solidstate physics and materials science. Non-collinear magnetismhas been studied both in an artificial multi-layer structure,which could have technological relevance as a magnetic sensordevice, and as excitations in 3d ferromagnets. LÄS MER