Sökning: "dielectric properties"

Visar resultat 21 - 25 av 71 uppsatser innehållade orden dielectric properties.

  1. 21. Characterization of Magneto-Dielectric Materials for Microwave Devices

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Fasta tillståndets elektronik

    Författare :Joseph Lazraq Byström; [2020]
    Nyckelord :magneto-dielectric materials; permittivity; permeability; losses; antenna and filter miniaturization;

    Sammanfattning : There is an increasing interest in using new composite materials in microwave devices, to reduce size and weight while maintaining similar performances. A new promising material group is named magneto-dielectric materials, which have the permittivity and permeability values both larger than one. LÄS MER

  3. 22. Ramification points of parameterized second-order polynomials and determination of zeros of generalized trigonometric and cylindrical polynomials

    Kandidat-uppsats, Högskolan i Gävle/Avdelningen för elektroteknik, matematik och naturvetenskap

    Författare :Davide Mariotti; [2020]
    Nyckelord :ramification points; cylindrical polynomials; perturbations;

    Sammanfattning : We consider the parameter dependence of zeros of polynomials and particularly the properties of the ramication points of second-order (quadratic) polynomials. The results are applied to the analysis of real and complex zeros of a particular set of generalized cylindrical polynomials in order to study resonance scattering of electromagnetic waves by a circular dielectric cylinder. LÄS MER

  4. 23. Measurements of resistivity in transformer insulation liquids

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för elektroteknik

    Författare :Jonathan Hägerbrand; [2020]
    Nyckelord :transformer oil; resistivity; ions; ion drift model; HVDC; contact resistance;

    Sammanfattning : This thesis focuses on measuring techniques and results of resistivity in four commercially available insulating transformer oils: mineral oil, ester oil and two isoparaffin oils. Two measuring techniques, the industrially used diagnostic system for electrical insulation IDA and the Labview implemented Triangular Method, are used for resistivity measurements and the techniques are compared, a correction algorithm to the triangular method is suggested. LÄS MER

  5. 24. Reliability of discerning humans using microwave polarisation and diffraction phenomena

    Master-uppsats, Mälardalens högskola/Akademin för innovation, design och teknik

    Författare :Susanne Lindgren; [2020]
    Nyckelord :;

    Sammanfattning : Presented here is an examination of the feasibility to utilise basic microwave phenomena for reliable human discernment. Being able to distinguishing a person from other objects is essential around society. For example, near railway tracks where lives could be saved if a system could alert the driver. LÄS MER

  7. 25. Dielectric properties of soda-lime silicate glass doped with TiO2

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Fasta tillståndets fysik

    Författare :Philip Sandell; [2020]
    Nyckelord :impedance spectroscopy; soda-lime; silicate; glass; titanium dioxide; dielectric;

    Sammanfattning : A survey of the dielectric properties of TiO2 doped soda-lime silicate is presented. Impedance spectroscopy was used with measurements conducted in a temperature range from 298 K to 623 K and frequencies between 10-2 and 106 Hz. LÄS MER