Sökning: "resonance frequency"

Visar resultat 1 - 5 av 172 uppsatser innehållade orden resonance frequency.

  1. 1. Inductive fast charging of IoT devices : An in-depth analysis of short-range wireless charging technologies based on induction

    Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för fysik

    Författare :Franz Wikner; [2024]
    Nyckelord :Electromagnetic power transfer; Inductive power transfer; Short distance WPT;

    Sammanfattning : In the era of Internet of things (IoT), sensor-equipped devices exchange data over networks. In battery powered IoT devices, the lifespan of the devices is often much longer than the battery life, leading to multiple costly and environmentally hazardous battery replacements during the operational life of the devices. LÄS MER

  3. 2. Vibration analysis and testing of a 6U cubesat propulsion system

    Master-uppsats, KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Författare :Likitha Thimmaraju Girijadevi; [2023]
    Nyckelord :6U CubeSat; Propulsion system; Vibration testing; COMSOL; Structures; ECSS; Stress; Resonance; Frequency; Load; Simulation.; 6U CubeSat; Framdrivningssystem; Vibrationstestning; COMSOL; Strukturer; ECSS; Stress; Resonans; Frekvens; Belastning; Simulering.;

    Sammanfattning : Space industry has been booming in the recent times, investments have not justbeen made on satellites and launch vehicles but also on space sustainability. Spaceindustry has its users in national agencies, private commercial agencies, academia andexperimental organisations. LÄS MER

  4. 3. Analys av ljudabsorberande spaltpaneler med varierande spjälbredd : En studie med mål att tillförse mätdata samt analysera stående våg över spjälbredd

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

    Författare :Johan Wangärd; Arthur Öhman; [2023]
    Nyckelord :Akustik; Spaltpanel; Membranabsorbent; Ljudabsorption; Helmholtzresonans;

    Sammanfattning : This study is based on a hypothesis from Delta Akustik AB regarding standing waves in slotted panels and the requisite for measurement data regarding its sound absorption. The purpose is to acquire measurement data and to examine three types of slotted panels and the possibility of a standing wave vertically in the boards. LÄS MER

  5. 4. Deep Learning for the prediction of RASER-MRI profiles

    Master-uppsats, Linköpings universitet/Medie- och Informationsteknik

    Författare :Filip Arvidsson; Jonas Bertilson; [2023]
    Nyckelord :MRI; NMR; AI; Deep Learning; RASER-MRI; Media Technology; KIT; LIU; CNN; Autoencoder; Djupinlärning; Medieteknik; Magnetröntgen;

    Sammanfattning : Magnetic resonance imaging (MRI) is a critical diagnostic tool in medical practice, enabling non-invasive visualization of anatomy and physiological processes. Nonetheless, MRI has inherent spatial resolution limitations, which may limit its diagnostic capabilities. LÄS MER

  7. 5. Phase Unwrapping MRI Flow Measurements

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen Vi3

    Författare :Mio Liljeblad; [2023]
    Nyckelord :phase unwrapping; computer vision; cine MRI; NMR; flow measurements; velocity encoding; venc; energy minimization; magnetic resonance; cardiac MRI; sinotubuar junction; pulmonary artery; ascending descending aorta; laplacian algorithm; iterative graph cuts; IGC; sequential tree-reweighted message passing; TRW-S; velocity to noise ratio; VNR; retrospective wrapping; energy formulation;

    Sammanfattning : Magnetic resonance images (MRI) are acquired by sampling the current of induced electromotiveforce (EMF). EMF is induced due to flux of the net magnetic field from coherent nuclear spins with intrinsic magnetic dipole moments. LÄS MER