Sökning: "primary nucleation"

Visar resultat 21 - 25 av 45 avhandlingar innehållade orden primary nucleation.

1. 21. Study of solidification and volume change in lamellar cast iron with respect to defect formation mechanisms

   Författare :Péter Svidró; Pär Jönsson; Pål Schmidt; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lamellar cast iron; shrinkage porosity; solidification; volumetric change; dendrite coherency; inter-dendritic space;

   Sammanfattning : Lamellar cast iron is a very important technical alloy and the most used material in the casting production, and especially in the automotive industry which is the major consumer. Beside the many great properties, it is inclined to form casting defects of which some can be prevented, and some may be repaired subsequently. LÄS MER

3. 22. Crystallisation of calcium phosphate and calcium oxalate in solutions simulating the composition at different levels of the nephron

   Författare :Inge Højgaard; Linköpings universitet; []
   Nyckelord :MEDICINE; MEDICIN;

   Sammanfattning : Calcium oxalate (CaOx) is the most common constituent of urinary calcium stones, but in many such stones calcium phosphate (CaP) is also present and often located in the centre. From these observations it has been assumed that CaP is important in the process that leads to the development of a calcium stone and furthermore that the initial steps in this crystallisation take place in the nephron. LÄS MER

4. 23. On the molecular mechanisms of the amyloid β-peptide aggregation

   Författare :Kalyani Sanagavarapu; NanoLund: Centre for Nanoscience; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein aggregation; amyloid β-peptide; aggregation kinetics; aggregation mechanism N-terminus; mutations; variants; sequence determinants; ; cross-seeding;

   Sammanfattning : The pathogenesis of Alzheimer’s disease is widely believed to be due to production and deposition of the amyloid β-peptide. Several variants of the Aβ peptide are known to exist in in vivo. Variations include mutations or additional functional groups attached to residue side chains and may affect the aggregation process. LÄS MER

5. 24. Co-assembly of proteins and lipids : From lipodiscs to amyloid aggregates

   Författare :Rebecca Frankel Willén; NanoLund: Centre for Nanoscience; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; amyloid; Aβ42; apolipoprotein A-1; aggregation; high-density lipoprotein; DNAJB6; Alzheimer s disease; protein-lipid interactions;

   Sammanfattning : Assemblies of different molecules is a prevalent phenomenon in nature, and crucial in biological life. Most of the biological assemblies are co-assembledcomposites, made up from several different components, either of thesame biomolecular type or a combination of different ones. LÄS MER

7. 25. On the effect of nitrogen, hydrogen and cooling rate on the solidification and pore formation in Fe-base and Al-base alloys

   Författare :Advenit Makaya; Hasse Fredriksson; Zhongyun Fan; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Porous metals; Metal foams; Gas solubility; Fe-base alloys; Al-base alloys; M7C3 carbides; Al3Ti; Al3Fe; Rapid solidification; Metastable phases; Other materials science; Övrig teknisk materialvetenskap;

   Sammanfattning : Experiments on the production of porous metallic materials were performed on Fe-base and Al-base alloys. The method involves dissolution of gases in the liquid state and solidification at various cooling rates. The alloy compositions were selected to induce solidification of primary particles intended to control the pore distribution. LÄS MER