Sökning: "Magnetic resonans"

Visar resultat 1 - 5 av 20 uppsatser innehållade orden Magnetic resonans.

  1. 1. Design and construction of a reliable wireless power transfer system for an embedded device : With emphasis on industrial applications

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

    Författare :Dhruvi Ajit Shukla; [2022]
    Nyckelord :Wireless Power Transfer WPT ; ferrites; Litz wire; skin effect; proximity effect; electromagnetic induction; electromagnetic resonance; magnetic coupling; power efficiency; LC circuits; Trådlös kraftöverföring WPT ; ferrit; litz-tråd; hudeffekt; närhetseffekt; elektromagnetisk induktion; elektromagnetisk resonans; magnetisk koppling; effekteffektivitet; LC-kretsar;

    Sammanfattning : This thesis deals with wireless power transfer from an external source to embedded small devices (such as for conditioning monitoring, control etc.) located at different distances from the source. The proposed designs can be used in a variety of applications, including mobile phones, electric cars, unmanned aerial vehicles, robots, etc. LÄS MER

  3. 2. Samband mellan stress och smärta : en pilotstudie

    Magister-uppsats, Umeå universitet/Institutionen för omvårdnad

    Författare :Debora Bergström; Emma Edman; [2022]
    Nyckelord :Anterior cingulate cortex ACC ; GABA; Glutamate; Magnetic Resonance Spectroscopy MRS ; Pain; Psychological stress; Anterior cingulate cortex ACC ; GABA; Glutamat; Magnetic Resonans Spectroscopi MRS ; Psykologisk stress; Smärta;

    Sammanfattning : Bakgrund: Smärta definieras som en subjektiv upplevelse där upplevelsen till viss del formas i hjärnan genom komplexa processer. Långvarig stress har visat sig leda till förändring i smärtkänsligheten vilket kanske förklaras av att akut stress förändrar aktivitet i främre delar av hjärnan. LÄS MER

  4. 3. Designing k-Space Filters to Improve Spatiotemporal Resolution with Sector-Wise Golden Angle (SWIG)

    Master-uppsats, KTH/Medicinteknik och hälsosystem

    Författare :Jonas Ström Seez; [2022]
    Nyckelord :Cardiovascular Magnetic Resonance Imaging CMR ; k-Space Filter; Sector Wise Golden-angle SWIG ; Kardiovaskulär Magnetisk Resonans Tomografi CMR ; k-rumsfilter; Sektorsvis Gyllene Vinkel SWIG ;

    Sammanfattning : The aim of this thesis is to design and evaluate k-space weighting filters for simultaneously improving the spatial and temporal resolution of cardiovascular MRI, with the ultimate goal of improving the accuracy of quantitative flow measurements, which are important for diagnosis and follow-up of heart dysfunction. Two different k-space filters were implemented and evaluated retrospectively to already acquired data. LÄS MER

  5. 4. Magnetically tunable microwave resonator/filter

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

    Författare :Zhi Ye; [2022]
    Nyckelord :Magnetic tuning; Ferrite; Substrate integrated waveguide resonator; Substrate integrated waveguide filter; Magnetisk inställning; Ferrit; Substratintegrerad vågledarresonator; Substratintegrerad vågledarfilter;

    Sammanfattning : The magnetic tunability of ferrites has been studied and applied on many electric components for working in various frequency bands. Filters or resonators loaded by ferrites can thus work for different frequency requirements by tunning external biasing field. However, filters or resonators built by traditional waveguides are large in size. LÄS MER

  7. 5. Association between cognitive measures, global brain surface area, genetics, and screen-time in young adolescents : Estimation of causal inference with machine learning

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Evgenija Kravchenko; [2021]
    Nyckelord :Causal modelling; DirectLiNGAM; PGS; intelligence; screen time; cognitive development; Kausal modellering; DirectLiNGAM; PGS; intelligens; skärmtid; kognitiv utveckling;

    Sammanfattning : Screen media activity such as watching TV and videos, playing video games, and using social media has become a popular leisure activity for children and adolescents. The effect of screen time has been a highly debated topic; however, there is still very little known about it. LÄS MER