Sökning: "Zr"

Visar resultat 1 - 5 av 49 uppsatser innehållade ordet Zr.

  1. 1. First principles investigation of the thermal conductivity of Zr, ZrC, and ZrN

    Master-uppsats, KTH/Fysik

    Författare :Daniel Karlsson; [2023]
    Nyckelord :Electron-phonon interaction; Density functional theory; Boltzmann transport equation; first-principles; thermal conductivity; electrical resistivity; Abinit; Phono3py; Elektron-fononväxelverkan; täthetsfunktionalteori; Boltzmanns transportekvation; värmeledningsförmåga; elektrisk resistivitet; Abinit; Phono3py;

    Sammanfattning : The thermal conductivity and electrical resistivity of Zr, ZrC, and ZrN were calculated using first-principles density functional theory (DFT) and the Boltzmann transport equation. The electron-phonon scattering was modeled via the self-energy relaxation time approximation (SERTA), and the phonon-phonon scattering via the analogous single-mode relaxation time approximation (SMRTA). LÄS MER

  3. 2. Michael additions utilizing transition-metal-catalysts, Scope and limitations

    Kandidat-uppsats, Lunds universitet/Kemiska institutionen

    Författare :Ruben Hansson; [2023]
    Nyckelord :Green chemistry; transition metal; rare earth metal; Michael addition; Yb; Zr; Hf; analytical chemistry; Chemistry;

    Sammanfattning : The effect that organic solvents have on the environment and the intrinsic risk that come with using them should be limited. By replacing organic solvents with less harmful solvents, such as water, and with more effective catalysts can risks intrinsic to organic solvents be minimized or eliminated. LÄS MER

  4. 3. Effect of Cement Type on Zirconia and Metal-Ceramic Tooth-Supported Crowns – A Retrospective Journal Survey

    Master-uppsats, Umeå universitet/Tandläkarutbildning

    Författare :Jennifer Nilsson; Mikael Wedin; [2022]
    Nyckelord :dentistry; prosthodontics; crown; cement; zirconia; porcelain-fused-to-metal;

    Sammanfattning : Background: The golden standard for single unit crowns has for long been porcelain fused to metal (PFM). However, demands for improved esthetic materials has driven the development of zirconia which has increased in popularity due to its eminent mechanical and esthetic properties. LÄS MER

  5. 4. Melt pool Geometry and Microstructure Characterization in Additively Manufactured WE43 Alloy

    Master-uppsats, Uppsala universitet/Institutionen för materialvetenskap

    Författare :Satya Chaitanya Vaddamanu; [2022]
    Nyckelord :;

    Sammanfattning : Mg-RE based alloys have exhibited promising properties in application for biodegradable implants. This work provides a systematic study on the characterization of melt pool geometry and profile for one such alloy, WE43. LÄS MER

  7. 5. Reconstruction of paleoclimate and loess provenance during the last glacial in Jersey using XRF analysis

    Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Matilda Persson; [2022]
    Nyckelord :loess; origin; La Motte; XRF; Quaternary; weathering; climate; lössjord; ursprung; La Motte; XRF; kvartär; vittring; klimat;

    Sammanfattning : With our changing climate it becomes more vital to understand the processes that control climate change in order to better understand possible future shifts. By doing this, predictions can be made about future climates and better prepare us for them. LÄS MER