Sökning: "nucleation control"

Visar resultat 21 - 25 av 57 avhandlingar innehållade orden nucleation control.

  1. 21. Slag inclusion formation during solidification of steel alloys and in cast iron

    Författare :Sofia Adolfi; Hasse Fredriksson; Karin Hansson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; solidification; segregation; precipitation; inclusions; inoculation; EMPA; Other materials science; Övrig teknisk materialvetenskap;

    Sammanfattning : This thesis explores the formation of segregation and inclusions during solidification of steel and cast iron. A better understanding of the formation mechanism should result in decreasing fraction of defects during solidification of ingot and strand material. LÄS MER

  3. 22. Thin Film Growth using Pulsed and Highly Ionized Vapor Fluxes

    Författare :Viktor Elofsson; Kostas Sarakinos; Jones Alami; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : Microstructure and morphology of thin films are decisive for many of their resulting properties. To be able to tailor these properties, and thus the film functionality, a fundamental understanding of thin film growth needs to be acquired. LÄS MER

  4. 23. Growth, characterization and processing of III-nitride semiconductors

    Författare :Fredrik Fälth; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The III-nitride semiconductor materials have wide direct bandgap ranging from 6.2 eV (AlN); through 3.4 eV (GaN) to 0.65 eV (InN). LÄS MER

  5. 24. MOCVD growth of GaN-based high electron mobility transistor structures

    Författare :Jr-Tai Chen; Erik Janzén; Urban Forsberg; James S. Speck; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The present work was to improve the overall quality of GaN-based high electron mobility transistor (HEMT) epitaxial structures grown on semi-insulating (SI) SiC and native GaN substrates, using an approach called bottom-to-top optimization. The bottom-to-top optimization means an entire growth process optimization, from in-situ substrate pretreatment to the epitaxial growth and then the cooling process. LÄS MER

  7. 25. Aerosol Generated Core-shell Nanoparticles : Synthesis and Characterization

    Författare :Markus Snellman; NanoLund: Centre for Nanoscience; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; aerosol technology; core-shell particles; nanoparticles; Janus particles;

    Sammanfattning : Aerosol technology is a promising platform to synthesize and study core-shellnanoparticles - a multi-elemental nanoparticle system where the core of one material is covered by a shell of another material. In this thesis, two distinctly separate strategies have been explored to synthesize core-shell nanoparticles by aerosol methods: physical vapor deposition (PVD) by evaporation, and surface segregation via thermal treatment. LÄS MER