Search for dissertations about: "demagnetization"

Showing result 1 - 5 of 14 swedish dissertations containing the word demagnetization.

  1. 1. Demagnetization Studies on Permanent Magnets Comparing FEM Simulations with Experiments

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Stefan Sjökvist; Uppsala universitet.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Permanent magnet; demagnetization; simulation; FEM; Comsol Multiphysics; VAWT; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : In a world where money often is the main controlling factor, everything that can be tends to be more and more optimized. Regarding electrical machines, developers have always had the goal to make them better. READ MORE

  2. 2. Demagnetization and Fault Simulations of Permanent Magnet Generators

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Stefan Sjökvist; Uppsala universitet.; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Demagnetization; Permanent magnet; Finite Element Method; Synchronous generators; Wind power; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

    Abstract : Permanent magnets are today widely used in electrical machines of all sorts. With their increase in popularity, the amount of research has increased as well. In the wind power project at Uppsala University permanent magnet synchronous generators have been studied for over a decade. READ MORE

  3. 3. A New Audiometric Bone Vibrator, Radioear B81, and the Bone Conduction Implant with Emphasis on Magnetic Resonance Imaging

    University dissertation from Chalmers University of Technology

    Author : Karl-Johan Fredén Jansson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; balanced electromagnetic separation transducer; bone conduction; bone vibrator; retention magnet; image artifact; demagnetization; magnetically induced torque; magnetic resonance imaging.;

    Abstract : Hearing by air conduction (AC) and bone conduction (BC) are attributed to be the natural ways of stimulating the cochlea. With AC hearing, the cochlea is stimulated by air pressure variations via the ear canal, whereas with BC hearing, sound vibrations are transmitted thru the skull bone to the cochlea. READ MORE

  4. 4. The Balanced Electromagnetic Separation Transducer for Bone Conduction Audiometry and Hearing Rehabilitation

    University dissertation from Chalmers University of Technology

    Author : Karl-Johan Fredén Jansson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; demagnetization; image artifact; magnetic resonance imaging; bone vibrator; balanced electromagnetic separation transducer; magnetically induced torque; retention magnet; bone conduction;

    Abstract : Hearing via air conduction (AC) and bone conduction (BC) are attributed to bethe natural ways of conducting sound to the cochlea. With AC hearing, air pressurevariations are transmitted to the cochlea via the ear canal, whereas with BChearing, sound vibrations are transmitted through the skull bone to the cochlea. READ MORE

  5. 5. Relativistic theory of laser-induced magnetization dynamics

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Ritwik Mondal; Uppsala universitet.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Relativistic quantum electrodynamics; magneto-optics; spin-orbit coupling; ultrafast demagnetization; inverse Faraday effect; magnetic inertia; Gilbert damping; Fysik; Physics;

    Abstract : Ultrafast dynamical processes in magnetic systems have become the subject of intense research during the last two decades, initiated by the pioneering discovery of femtosecond laser-induced demagnetization in nickel. In this thesis, we develop theory for fast and ultrafast magnetization dynamics. READ MORE