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Visar resultat 1 - 5 av 10 uppsatser som matchar ovanstående sökkriterier.

  1. 1. High-throughput ab-initio calculation of the elastic constants of alloys with vacancies - Ta0.5Al0.5N1-x and Nb0.5Al0.5N1-x with x = 0.03, 0.05 and 0.10

    Master-uppsats, Linköpings universitet/Teoretisk Fysik

    Författare :Sadeq Hassani; [2023]
    Nyckelord :Vacancy concentration; Structural properties; Mechanical properties; High-throughput calculations; TaAlN; NbAlN;

    Sammanfattning : In today's data-driven society, data holds immense value and is sought after across various domains, including the realm of science. Materials science, in particular, relies heavily on data acquisition and analysis to further advancements in the field. LÄS MER

  3. 2. Multi-Scale Topology Optimization of Lattice Structures Using Machine Learning

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad mekanik

    Författare :Julia Ibstedt; [2023]
    Nyckelord :Topology optimization; Multi-scale topology optimization; Machine learning; Gaussian process; Homogenization; Inverse homogenization; Anisotropic materials; Symmetry groups; Material property space; Topologioptimering; Flerskalig topologioptimering; Maskininlärning; Gaussian process; Homogenisering; Anisotropa material; Symmetrigrupper; Materialegenskapsrymd;

    Sammanfattning : This thesis explores using multi-scale topology optimization (TO) by utilizing inverse homogenization to automate the adjustment of each unit-cell's geometry and placement in a lattice structure within a pressure vessel (the design domain) to achieve desired structural properties. The aim is to find the optimal material distribution within the design domain as well as desired material properties at each discretized element and use machine learning (ML) to map microstructures with corresponding prescribed effective properties. LÄS MER

  4. 3. Micro-architectured materials for noise and vibration control in high voltage products – design and modelling

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad mekanik

    Författare :Alec Chamberlain; [2021]
    Nyckelord :Microarchitectured; lattice; elasticity; viscoelasticity; computational; homogenization;

    Sammanfattning : Many Hitachi ABB Power Grids (HAPG) products vibrate and emit noise, but legal limitations of these parameters fuel the development of energy absorption methods used on products. Methods such as Constrained Layer Damping (CLD). LÄS MER

  5. 4. Dämpning av seismiska vågor

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Pouyan Missaghian; [2018]
    Nyckelord :;

    Sammanfattning : The aim of this project is to calculate the attenuation of seismic waves passing through the Earth's core by using given elastic constants and methods developed earlier and to see how we can interpret the crystallization of iron in that area by these results as well as a look at how sound waves propagate in solid and liquid substances, how the elastic properties of a material can affect the waves and how we can relate these to the attenuation. The attenuation inside Earth will also be described. LÄS MER

  7. 5. Low-Frequency Noise in InGaAs Nanowire MOSFETs

    Master-uppsats, Lunds universitet/Fasta tillståndets fysik; Lunds universitet/Fysiska institutionen

    Författare :Christian Mario Möhle; [2017]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Low-frequency (LF) noise (1/f as well as random telegraph-signal (RTS) noise) measurements were performed on high-performance InGaAs nanowire (NW) metal-oxide-semiconductor field-effect transistors (MOSFETs). 1/f noise measurements at room temperature (RT) show that the dominant noise mechanism is carrier number fluctuations. LÄS MER