Sökning: "Fields"

Visar resultat 11 - 15 av 2824 avhandlingar innehållade ordet Fields.

  1. 11. Microwave Breakdown in Inhomogeneous Fields

    Författare :Joel Rasch; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; corona; inhomogeneous fields; Microwave breakdown; multipactor;

    Sammanfattning : Microwave breakdown continues to be a risk in many applications involving the transmission and reception of microwave frequency signals. Satellite communication is especially interesting from the research point of view because of the extreme costs, and limited testing possibilities. LÄS MER

  3. 12. Pulsed Electric Field Food Treatment and Low Frequency Bioelectromagnetics

    Författare :Martin Lindgren; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; extremely low frequency; non-thermal microbial inactivation; electromagnetic fields; biological effects; treatment chambers; electric field distribution; magnetic fields; pulsed electric fields;

    Sammanfattning : This thesis is divided in two parts, both of which address the interaction between biological cells (especially cell membranes) and electromagnetic fields. The first part deals with the application of intense pulsed electric fields (PEF) in foods. It is intended to be a non-thermal method to inactivate microorganisms. LÄS MER

  4. 13. Två musikpedagogiska fält : en studie om kommunal musikskola och musiklärarutbildning

    Författare :Sture Brändström; Christer Wiklund; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; music education; music pedagogy; music instruction; ethnomu-sicology; music sociology; music teacher education; Musikpedagogik;

    Sammanfattning : The thesis consists of two parts. One is directed towards municipal music schools, and one deals with music teacher education at university level. The purpose was to investigate the recruitment to these two educations, and to describe and explain how different student groups perceived and used their education. LÄS MER

  5. 14. Generation of magnetic fields on galactic scale

    Författare :Fabio Del Sordo; Axel Brandenburg; Oliver Gressel; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Magnetic fields; galaxies; Astronomy; astronomi;

    Sammanfattning : In these pages we will go through the topic of astrophysical magnetic fields, focusing on galactic fields, their observation and the theories that have been developed for a proper understanding of the these physical phenomena.We review the main work in the study of galactic magnetic fields, often seeing how it is important to deal with problems of general validity in order to be able to point out the right elements needed for a correct interpretation of specific situations. LÄS MER

  7. 15. Light and X-ray scattering investigations of microtubules subjected to oscillating electric fields

    Författare :Per Börjesson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Microtubules; Electric fields; High-frequency fields;

    Sammanfattning : I vårt dagliga liv blir vi utsatta för oscillerande elektriska fält av olika frekvenser. Dessa fält inkluderar mobiltelefoner, wifi, bluetooth, radar för navigering, radar från bilar, kommunikationssatelliter, samt GPS. LÄS MER