Sökning: "Wei Luo"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Wei Luo.

  1. 1. Theoretical Investigations of Compressed Materials

    Författare :Wei Luo; Rajeev Ahuja; Maurizio Mattesini; KTH; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The use of high pressure as a tool to design new materials as well as to investigatematerials properties has become increasingly important during last one decade. The maingoal of the present thesis is to enhance the significance of the high pressure method as aquantitative tool in solid state investigations. LÄS MER

  3. 2. Theoretical Study on Chemical Structures and Stability of Molecules in Metallic Junctions

    Författare :Wei Hu; Yi Luo; Lasse Jensen; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; SERS; IETS; Interface; Chemical Stability; Teoretisk kemi och biologi; Theoretical Chemistry and Biology;

    Sammanfattning : In this thesis, we focus on the structural identification of the interface using surface enhanced Raman spectroscopy (SERS) and inelastic electron tunnelling scattering (IETS). Two different molecular junctions, namely gold/ trans-1,2-bis (4-pyridyl) ethylene/gold junction and gold/4,4'-bipyridine/gold junctions in various conditions were studied and the corresponding configurations were determined. LÄS MER

  4. 3. Computational Insights into Atomic Scale Wear Processes in Cemented Carbides

    Författare :Emil Edin; Rajeev Ahuja; Andreas Blomqvist; Jonas Östby; Wei Luo; Hannes Jónsson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; WC; Cemented Carbides; Diffusion; Wear; Interfaces; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : As Ti-alloys become more and more utilized the need for efficient and robust manufacturing of Ti-alloy components increase in importance. Ti-alloys are more difficult to machine than e.g. steel, mainly due to their poor thermal conductivity leading to rapid tool wear. LÄS MER

  5. 4. First-principles study of defects instructural materials

    Författare :Li Ruihuan; Levente Vitos; Wei Luo; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : In this thesis, first we focus on the Helium (He) and He bubbles behavior in three kinds of the most promising candidate structural materials for future fusion reactor. These materials are vanadium, silicon carbide (SiC) composites, and reduced activation ferritic-martensitic (RAFM) steels. LÄS MER

  7. 5. Density Functional Study of Elastic Properties of Metallic Alloys

    Författare :Liyun Tian; Levente Vitos; Wei Luo; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Special quasi-random structure (SQS) and coherent potential approximation (CPA) are techniques widely employed in the first-principles calculations of random alloys. The aim of the thesis is to study these approaches by focusing on the local lattice distortion (LLD) and the crystal symmetry effects. LÄS MER