Sökning: "dielectric properties"

Visar resultat 1 - 5 av 266 avhandlingar innehållade orden dielectric properties.

  1. 1. Cellulose-based electrical insulation materials : Dielectric and mechanical properties

    Författare :Rebecca Hollertz; Lars Wågberg; Markus Biesalski; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cellulose; dielectric materials; electrical insulation; nanocellulose; nanoparticles; streamer; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : The reliability of the generation and distribution of electricity is highly dependent on electrical insulation and is essential for the prosperity of our society and a ubiquitous part of our everyday life. The present study shows how some important material properties affect the electrical properties of cellulose-based electrical insulation systems which are used together with mineral oil in high-voltage transformers. LÄS MER

  3. 2. The dielectric properties of solid biofuels

    Författare :Ana Marta Paz; Erik Dahquist; Ebbe Nyfors; Mälardalens högskola; []
    Nyckelord :dielectric properties; solid biofuels; moisture content determination; Energy- and Environmental Engineering; energi- och miljöteknik;

    Sammanfattning : The use of bioenergy has been increasing due to efforts in fossil fuels replacement. Modern bioenergy technologies aim for high efficiency and low pollution levels, which increases the need for methods for the on-line characterization of biofuels. LÄS MER

  4. 3. Dielectric properties of composite structures and filled polymeric composite materials

    Författare :Enis Tuncer; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dielectric data analysis; dielectric spectroscopy; finite element; dielectric mixtures; composite materials; thermally stimulated depolarization;

    Sammanfattning : .... LÄS MER

  5. 4. Dielectric Properties of Liquid-Impregnated Porous Solids

    Författare :Bo Nettelblad; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fluid-solid interface; porous microstructure; temperature; ion-containing liquid; transport properties of porous media; brine; salinity; electric conduction; models of composite media; interface phenomena; dielectric relaxation; rock;

    Sammanfattning : Dielectric spectroscopy is a versatile tool that can often be used as a non-destructive, indirect way of measuring other important properties (such as content of crude oil or degree of curing of a resin). The dielectric properties of materials are thus of interest in several circumstances and not only for materials used for electrical purposes (such as electrical insulation). LÄS MER

  7. 5. Dielectric Relaxation in Dielectric Mixtures

    Författare :Enis Tuncer; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : In this thesis dielectric properties of both ideal composite structures and polymeric composite materials were investigated. Numerical calculations were performed to simulate frequency response of interfacial polarization using the finite element method in two dimensions. LÄS MER