Search for dissertations about: "electricity and magnetism"

Found 5 swedish dissertations containing the words electricity and magnetism.

  2. 1. Synthesis, characterisation and applications of iron oxide nanoparticles

    Author : German Salazar Alvarez; Manoun Muhammed; Jarl B. Rosenholm; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; biochemistry; electricity and magnetism; optics; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Abstract : Further increase of erbium concentrations in Er-doped amplifiers and lasers is needed for the design of efficient, reliable, compact and cost-effective components for telecommunications and other photonic applications. However, this is hindered by Er concentration dependent loss mechanism known as upconversion. READ MORE

  4. 2. Models of magnetism in electrical machines

    Author : Gustav Mörée; Mats Leijon; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : The magnetic field is a fundamental part of an electrical machine, for establishing the torque and inducing voltages and currents. Then acting as the link between mechanical power and electrical power. This thesis will give a comprehensive study of how magnetism could be modeled. READ MORE

  5. 3. Structural Studies of Mn-X (X=Al, Bi): Permanent Magnetic Materials without Rare Earth Metals

    Author : Hailiang Fang; Martin Häggblad Sahlberg; Peter Svedlindh; Samrand Shafeie; Linda Udby; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Synthesis; Magnetism; Diffraction.; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

    Abstract : How to generate and use electricity in a more efficient way is a major challenge for humankind. In this context, permanent magnets play an important role within a very broad range of electric power applications. The strongest magnets used today are mainly based on alloys that contain rare-earth metals, which are neither economical nor sustainable. READ MORE

  6. 4. Materials Engineering Using Density Functional Theory

    Author : Adrian Taga; KTH; []
    Keywords : condensed matter; electricity and magnetism;

    Abstract : This doctoral thesis presents density functionalcalculations applied in several domains of interest in solidstate physics and materials science. Non-collinear magnetismhas been studied both in an artificial multi-layer structure,which could have technological relevance as a magnetic sensordevice, and as excitations in 3d ferromagnets. READ MORE

  7. 5. Nanospintronics with Molecular Magnets - Tunneling and Spin-Electric Coupling

    Author : Javier Francisco Nossa Márquez; Fasta tillståndets fysik; []
    Keywords : Molecular magnets; spin exchange; spin-orbit interaction; magnetic anisotropy; spin frustration; spin chirality; spin-electric control; quantum transport; Coulomb blockade; density functional theory; quantum master equation.;

    Abstract : This dissertation investigates theoretically electric control of the magnetic properties of molecular magnets. Two classes of magnetic molecules are considered. The first class consists of molecules that are spin frustrated. READ MORE