Sökning: "metal distribution"

Visar resultat 21 - 25 av 147 uppsatser innehållade orden metal distribution.

1. 21. Uranium Mineralizations at Kiirunavaara,Northernmost Sweden

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Diego Segovia Menard; [2022]
   Nyckelord :kiirunavaara; uranium; EPMA; water; hydrothermal;

   Sammanfattning : In recent years, a variably high amount of uranium (U) and radon (Rn) were found in the water and airof the Kiirunavaara mine in Kiruna, northern Sweden. The Swedish Agency for Marine and WaterManagement (Havs och vattenmyndigheten) has maximum limits for “special polluting substances” inwater that is released to natural recipients (HVMFS 2019:25), therefore, the mining company LKAB,owner and operator of the Kiirunavaara mine, decided to conduct a study to investigate the issueregarding these findings, triggering this master thesis. LÄS MER

3. 22. The magnetic field of phi Draconis

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Nikolaos Papakonstantinou; [2022]
   Nyckelord :stars: atmospheres – stars: chemically peculiar – stars: magnetic field – stars: starspots – stars: individual: phi Dra;

   Sammanfattning : Within this past decade, advances in spectropolarimetric analyses allowed mapping surface characteristics of nearby non-resolved stars with unique characteristics. In this study, we attempt mapping of the magnetic field structure and surface distribution of elements for such a star, the magnetic Ap star phi Dra. LÄS MER

4. 23. Characterization of Metal Powders in Electron Beam Powder Bed Fusion : Regarding particle size distribution of the finished part

   Kandidat-uppsats, KTH/Materialvetenskap

   Författare :Mattias Jerhamre Engström; Saman Sharif Hedås; [2022]
   Nyckelord :;

   Sammanfattning : As the manufacturing industry looks for better ways to create complex parts using sustainable and efficient methods, the additive manufacturing sector is taking a step forward. Additive manufacturing brings with it a large reduction in material used and the complex structures that can be created are not something to overlook. LÄS MER

5. 24. Characterization of the cobalt content in zinc ore from Zinkgruvan, Sweden

   Master-uppsats, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

   Författare :Ingeborg Hjorth; [2022]
   Nyckelord :Zinkgruvan; Bergslagen; Cobalt; Sphalerite; Pyrrhotite; Safflorite;

   Sammanfattning : Zinkgruvan is a stratiform Zn-Pb-Ag deposit located in the Bergslagen ore district in south central Sweden. Elevated concentrations of cobalt have been detected in zinc ore from the mine. LÄS MER

7. 25. Numerical Simulation of 3.3 kV–10 kV Silicon Carbide Super Junction-MOSFETs for High Power Electronic Applications

   Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Författare :Rishi Balasubramanian Saraswathy; [2022]
   Nyckelord :Super–Junction; DMOSFET; 4H-SiC; Silicon Carbide; Wide bandgap; 6.5 kV; 10 kV; On-state resistance; Breakdown voltage; Super–Junction; DMOSFET; 4H-SiC; kiselkarbid; bredbandgap; 6.5 kV; 10 kV; framspänningsfall; spärrspänning;

   Sammanfattning : The thesis focuses on designing and characterizing SiC 3.3 kV Diffused Metal-Oxide Semiconductor Field-Effect Transistor (DMOSFET)s with a Ron that is significantly lower than that of current commercial devices. The On-state resistance and breakdown voltage are then adjusted by adding a Super-Junction structure. LÄS MER