Sökning: "magnetic losses"

Visar resultat 21 - 25 av 101 avhandlingar innehållade orden magnetic losses.

  1. 21. Geometrical Structure, Phase Diagrams, and Core-Level Binding Energiesof Metal Surfaces: Calculations, Simulations, and Experiments

    Författare :Mikael Borg; Synkrotronljusfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; adsorption; chemical shifts; low energy electron diffraction; Monte Carlo simulations; Condensed matter:electronic structure; electrical; magnetic and optical properties; Kondenserade materiens egenskaper:elektronstruktur; spectroscopy; relaxation; magnetic resonance; supraconductors; spektroskopi; magnetisk resonans; supraledare; egenskaper elektriska; magnetiska och optiska ; molecular vibrations; density functional theory; single crystal surfaces; core-level photoemission; metal surfaces; Fysicumarkivet A:2003:Borg;

    Sammanfattning : This thesis concerns clean and adsorbate covered metal surfaces and surface alloys. These systems have been studied using theoretical and experimental methods. In the first part of the thesis, the different techniques that have been utilized in this work are presented, and the included publications are summarized. LÄS MER

  3. 22. Electromagnetic Waves in Media with Ferromagnetic Losses

    Författare :Jörgen Ramprecht; Martin Norgren; Constantin Simovski; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrophysics; Elektrofysik;

    Sammanfattning : The operation of a wide variety of applications in today's modern society are heavily dependent on the magnetic properties of ferromagnetic materials and their interaction with electromagnetic fields. The understanding of these interactions and the associated loss mechanisms is therefore crucial for the improvement and future development of such applications. LÄS MER

  4. 23. Iron losses during desulphurisation of hot metal

    Författare :Marianne Magnelöv; Mårten Görnerup; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Process Metallurgy; Processmetallurgi;

    Sammanfattning : After injection of calcium carbide and magnesium during desulphurisation of hot metal, the slag is normally solid and contains large amounts of iron. Besides the enclosed iron droplets in the slag, drawn-off hot metal during slag skimming also accounts for iron losses during desulphurisation of hot metal. LÄS MER

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

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

    Sammanfattning : 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. LÄS MER

  7. 25. Slotless High-Performance Electric Drives : Harmonic Loss Analysis, Sensorless Control, and Inverter Design

    Författare :Jonas Millinger; Oskar Wallmark; Juliette Soulard; Zi-Qiang Zhu; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite-element analysis; harmonic losses; sensorless control; slotless motor drives; thermal modeling; wide-bandgap inverter; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Electric motor drives are a cornerstone for many fundamental functions in today’s society, and their expected dominance within the transport sector is considered one of the main keys to abate global warming. Subsequently, the incentives for improved performance of electric motor drives cannot be sufficiently emphasized. LÄS MER