Search for dissertations about: "Mattias Wallin"

Found 4 swedish dissertations containing the words Mattias Wallin.

  2. 1. An experimental generator test setup for hydropower research and model verification

    Author : Mattias Wallin; Uppsala universitet; []
    Keywords : ;

    Abstract : This licentiate thesis describes the design and construction of a synchronous generator test setup. Some initial measurements are also presented. A twelve pole synchronous generator has been built from a synchronous motor. READ MORE

  4. 2. Measurement and modelling of unbalanced magnetic pull in hydropower generators

    Author : Mattias Wallin; Urban Lundin; Antero Arkkio; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Damper winding; eddy currents; field winding short circuit; finite element method; hydropower generator; parallel circuits; rotor eccentricity; salient poles; synchronous generators; synchronous machines; UMP; unbalanced magnetic pull.; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : Hydropower research is often perceived to be an old and exhausted field of study but with ageing equipment and the need for more intermittent operation caused by an increased share of other renewable energy sources new challenges lie ahead.The main focus of this dissertation are the electromagnetic forces resulting from nonuniform air gap flux, whether it be caused by rotor eccentricity or a faulty field winding. READ MORE

  5. 3. Theory for superconducting few-photon detectors

    Author : Mattias Jönsson; Jack Lidmar; Mats Wallin; Marcin Swillo; Karl Berggren; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Fysik; Physics;

    Abstract : High-performance photon detectors are essential for fiber communication, which is the foundation of the modern internet. Emerging quantum information technologies, such as quantum key distribution, impose new requirements on the photon detectors used. READ MORE

  6. 4. People of the Dolmens and Stone Cists : An archaeogenetic Investigation of Megalithic Graves from the Neolithic Period on Gotland

    Author : Magdalena Fraser; Kjel Knutsson; Mattias Jakobsson; Paul Wallin; Anders Götherström; Per Åke Persson; Uppsala universitet; []
    Keywords : HUMANIORA; HUMANITIES; archaeology; aDNA; ancient genomics; archaeogenetics; mtDNA; osteology; radiocarbon dating; Strontium; Carbon; Nitrogen; TRB; PWC; BAC; CWC; dolmen; stone cist; population demography; diet; mobility; cultural duality; admixture; kinship; Neolithic period; Early Bronze Age; Europe; Baltic Sea area; Scandinavia; Gotland; Molekylär genetik; Molecular Genetics;

    Abstract : The study of ancient genomics of pre-historic human remains has in recent years offered unprecedented knowledge regarding pre-historic migration and population structure on the European continent which has fundamentally altered the current views in the archaeological community. However, the merging of the two fields, archaeology and genetics, is still in its infancy and much work is still needed in order for these fields to integrate. READ MORE