Search for dissertations about: "dielectric permittivity"

Showing result 16 - 20 of 56 swedish dissertations containing the words dielectric permittivity.

  2. 16. Dielectric and Conductivity Studies of Polymer Electrolytes

    Author : Ingvar Albinsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Dielectric and conductivity studies has been performed in order to study the microscopic structure and dynamics of ion conducting polymers. The investigated systems are various salts, e.g. LiCF3SO3, dissolved in poly(ethylene glycol), poly(propylene glycol) or copolymers which partly consists of these polymers. READ MORE

  4. 17. Effects of Corona and Ozone Exposure on Properties of Polymeric Materials for High Voltage Outdoor Applications

    Author : Bin Ma; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; surface resistivity; silicone rubber; nanocomposite; Outdoor insulation; ozone treatment; dielectric response; hydrophobicity; corona treatment; composite insulation; volume resistivity; ageing.; mechanical strength;

    Abstract : Despite the past four decades of service experiences with polymeric insulators in power systems all over the world, an adequate standard allowing for proper selection of polymeric materials for applications in high voltage outdoor environments has still been lacking. Therefore CIGRE Working Group D1. READ MORE

  5. 18. Diagnosis of Moisture in Transformer Insulation - Application of frequency domain spectroscopy

    Author : Chandima Ekanayake; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; moisture content; diagnostic methods; modelling; polarisation depolarisation currents PDC ; frequency domain spectroscopy FDS ; dielectric response measurements; Oil-impregnated pressboard paper insulation; Karl Fischer titration KFT ; conductivity; ageing;

    Abstract : This thesis presents application of dielectric response measurements for identifying condition of high voltage insulation in power transformers. Results of such measurements, incorporated with different modelling techniques, allow to estimate moisture content in solid part of transformer insulation. READ MORE

  6. 19. Charged Particle Transport: As Information Source about Ion Conductors, Dielectric Materials, and Drug Delivery Systems

    Author : Göran Frenning; Jan Swenson; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; Engineering Science; teknisk fysik med inriktning mot fasta tillståndets fysik;

    Abstract : This thesis treats charged particle transport, mostly in solid materials but also, to some extent, in aqueous media. Three major types of materials have been investigated; dielectric materials, ion conductors, and drug-delivery systems. READ MORE

  7. 20. Prospective Applications of Microwaves in Medicine : Microwave Sensors for Orthopedic Monitoring and Burn Depth Assessment

    Author : Syaiful Redzwan Mohd Shah; Robin Augustine; Taco Johan Blokhuis; Luca Roselli; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Microwave sensors; split ring resonator; biomedical application; orthopedics; lower extremity injuries; craniosynostosis; burn assessment; clinical measurements; tissue dielectric properties; phantom; Engineering Science with specialization in Microwave Technology; Teknisk fysik med inriktning mot mikrovågsteknik;

    Abstract : In recent years, the use of microwave techniques for medical diagnostics has experienced impressive developments. It has demonstrated excellent competencies in various modalities such as using non-ionizing electromagnetic waves, providing non-invasive diagnoses, and having the ability to penetrate human tissues within the GHz range. READ MORE