Sökning: "materialvetenskap"

Visar resultat 26 - 30 av 931 avhandlingar innehållade ordet materialvetenskap.

  1. 26. Plasma assisted low temperature semiconductor wafer bonding

    Författare :Donato Pasquariello; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Wafer Bonding; Oxygen Plasma; InP; Si; Semiconductor; Materialvetenskap; Materials science; Teknisk materialvetenskap; materialvetenskap; Materials Science;

    Sammanfattning : Direct semiconductor wafer bonding has emerged as a technology to meet the demand foradditional flexibility in materials integration. The applications are found in microelectronics, optoelectronics and micromechanics. For instance, wafer bonding is used to produce silicon-on-insulator (SOI) wafers. LÄS MER

  3. 27. On Tool Failure in Die Casting

    Författare :Anders Persson; Sture Hogmark; Jens Bergström; Torsten Eriksson; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; materialvetenskap; Materials Science;

    Sammanfattning : Die casting is a very cost-efficient method of forming thin-walled and complex near net-shaped products with close geometric tolerances and good surface finish. A permanent die tool is used to make large quantities of identical products. The performance and tool life are limited by several mechanisms, e.g. LÄS MER

  4. 28. Synthesis, characterisation and applications of iron oxide nanoparticles

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

    Sammanfattning : 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. LÄS MER

  5. 29. The effect of ladle vacuum treatment on inclusion characteristics for tool steels

    Författare :Karin Steneholm; Pär Jönsson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; oxygen activity; inclusion characteristics; vacuum degassing; desulphurizatin; slag; ladle; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Sammanfattning : .... LÄS MER

  7. 30. Thermodynamic investigations of transition metal systems containing coabon and nitrogen

    Författare :Lidong Teng; Seshadri Seetharaman; Tooru Matsumiya; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; thermodynamic activity; galvanic cell technique; transition metal carbides; transition metal nitrides; phase equilibrium; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Sammanfattning : In view of the important applications of carbides and carbo-nitrides of transition metals in the heat-resistant and hard materials industries, the thermodynamic activities of Cr and Mn in the Cr-C, Fe-Cr-C, Mn-Ni-C and Mn-Ni-C-N systems have been studied in the present work by the use of the galvanic cell technique. CaF2single crystals were used as the solid electrolyte. LÄS MER