Sökning: "multi-layer structure"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden multi-layer structure.

  1. 1. Computational Road Mechanics - with Emphasis on FE-analysis of Rutting

    Detta är en avhandling från Chalmers University of Technology

    Författare :Johan Olsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2003]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Samhällsbyggnadsteknik och arkitektur; Civil engineering and architecture; Teknisk mekanik; Engineering mechanics; non-linear FEM; road design; multi-layer structure; material models; unbound material; asphalt concrete;

    Sammanfattning : A road is a very complex structure in which a large number of different structural phenomena occur simultaneously that effects its expected lifetime. The structure itself is of a multi-layer type, in which the different layers consist of materials that exhibit vastly different physical behaviors when subjected to various kinds of loads. LÄS MER

  2. 2. On the analysis of soft surfaces, frequency selective surfaces and con­formal antennas

    Detta är en avhandling från Chalmers University of Technology

    Författare :Silvia Raffaelli; Chalmers tekniska högskola.; Chalmers University of Technology.; [1999]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; Electrical engineering; antenna; horn; corrugated surface; dual-frequency; periodic; array; infinite; method of moments; finite difference time domain; microstrip; multi-layer structure; spectral domain analysis;

    Sammanfattning : .... LÄS MER

  3. 3. 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

  4. 4. 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

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

    Detta är en avhandling från Chalmers University of Technology

    Författare :Ulf Carlberg; Chalmers tekniska högskola.; Chalmers University of Technology.; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; Electrical engineering; antenna; moment method; reverberation chamber; cylindrical structure; spectral domain method; Ewald summation; Green s function; absorption cross section; cavity;

    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