Sökning: "primary nucleation"

Visar resultat 11 - 15 av 45 avhandlingar innehållade orden primary nucleation.

  1. 11. Amyloid beta aggregation kinetics : The role of intrinsic and extrinsic factors

    Författare :Xiaoting Yang; Biokemi och Strukturbiologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Alzheimer s disease; Abeta; aggregation; kinetics; secondary nucleation;

    Sammanfattning : Cerebral senile plaque is one of the main pathologies of Alzheimer's disease (AD). The amyloid cascade hypothesis suggests that the aggregation of amyloid beta (Abeta) peptide is involved in the pathogenesis of AD, which is supported by the fact that Abeta overexpression or production of more aggregation-prone variants lead to early-onset dementia. LÄS MER

  3. 12. The mechanisms of metal expansion penetration during solidification of grey cast iron

    Författare :Izudin Dugic; Preben Norgaard Hansén; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Grey cast iron; solidification; solidification modelling; graphite expansion; molar volume; casting simulation; thermal analysis; thermoanalysis cup; casting temperature; inoculation; inoculant; metal expansion penetration; eutectic cell size; primary austenite; austenite grain; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The production of high quality castings requires the casting surface to be clean and free from defects. One type of defect often found is caused by metal penetration into the sand mould. LÄS MER

  4. 13. On the Residual Stresses and Microstructure Formation of Aluminum-Silicon Cast Alloys

    Författare :Mohsen Sadrossadat; Sten Johansson; Ru Lin Peng; Ingvar L Svensson; Linköpings universitet; []
    Nyckelord :Al-Si alloys; residual stresses; microstructure; microsegregation; nucleation behavior; modeling; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Cast aluminum-silicon alloys are being increasingly used in automotive and aerospace industries for critical structure applications because of their excellent castability, low density, acceptable mechanical properties and low cost. Different casting and heat treatment parameters largely affect the microstructure and residual stress of the components, which in turn, has a great impact on their mechanical properties. LÄS MER

  5. 14. Improved Cloud Parameterization in Global Climate Model : Aerosol effects and secondary ice production mechanisms

    Författare :Arti Jadav; MERGE: ModElling the Regional and Global Earth system; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cloud; Coud parameterization; Primary ice mechanisms; Secondary ice production; Global climate model;

    Sammanfattning : The response of clouds to the changes in climate is uncertain, and the representation of the cloud-climate feedback is a key challenge in the global circulation models (GCM) for future climate projections. Factors contributing to this uncertainty include processes that involve particles of various sizes and phases, as well as the interactions between these particles and the surrounding atmosphere. LÄS MER

  7. 15. γ-Radiation Induced Synthesis of Metal oxides : Control of Particle Size, Composition, and Morphology

    Författare :Zhuofeng Li; Mats Jonsson; Hynd Remita; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; γ-radiation induced synthesis; Metal oxide nanoparticles; Metal oxide nucleation; Mesocrystal formation; Carbon black reactivity towards radical; PVP nanogel.;

    Sammanfattning : Nanomaterials show a significant difference in chemical, mechanical, electronic, magnetic and optical properties compared with bulk counterparts. The synthesis is a key-step to achieve the unique properties of nanomaterials. LÄS MER