Sökning: "Water amplitudes"

Visar resultat 1 - 5 av 11 uppsatser innehållade orden Water amplitudes.

  1. 1. Methods for determining focal point and delay for ultrasound arrays and multichannel electronics

    Master-uppsats, Lunds universitet/Avdelningen för Biomedicinsk teknik

    Författare :Svante Rosenlind; [2023]
    Nyckelord :Focusing algorithms; k-wave; Spatiotemporal inverse filter; Gerchberg- Saxton algorithm; Focused ultrasound; Technology and Engineering;

    Sammanfattning : High intensity focused ultrasound is a growing technique for tissue ablation, among other uses, and given its destructive capabilities, there is a need for control of where the energy is delivered. There exist a number of methods for focusing such ultrasound arrays, but these often assume prior knowledge of the impulse response, or require extensive full-system simulations. LÄS MER

  3. 2. Breathing Effects in Proton Scanning for Hodgkin's Lymphoma

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :John Nilsson; [2022]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Purpose/Background Proton beam scanning (PBS) for mediastinal Hodgkin's Lymphoma (HL) is limited when treating in free-breathing (FB) due to breathing motion in the thoracic region. Tumour motion and the time structure of the beam delivery will cause interplay and dose blurring effects, resulting in discrepancies of dose in the planned dose distribution both inside and at the edges of tumour volume (TV). LÄS MER

  4. 3. A Simulation of Landslide-Generated Waves Using a Fully Implicit ISPH

    Master-uppsats, Lunds universitet/Avdelningen för Teknisk vattenresurslära

    Författare :Kosei Nishida; [2020]
    Nyckelord :SPH; Landslide-generated waves; non-newtonian fluid; multiphase flow; Technology and Engineering;

    Sammanfattning : Smoothed Particle Hydrodynamics (SPH) is used to study the mechanisms of landslide-generated waves. As the landslide dynamics and the evaluation of impact forces acting on water are most important, landslide is modelled as a highly viscous fluid. Incompressible SPH (ISPH) is used for fluid simulation. LÄS MER

  5. 4. Real-time imaging of cerebrospinal fluid flow physiology at 7T

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Olle Haglund; [2019]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Background The cerebrospinal fluid (CSF) is involved in several diseases and patho- physiological states, such as Alzheimer’s disease and hydrocephalus. Previous studies CSF dynamics in the brain show that the flow of the CSF depends on cardiac pulsation, time of day and respiration. LÄS MER

  7. 5. A simplified model for the design of floor structures with vibrating sources for architectural applications

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Rebecca Janson; [2019]
    Nyckelord :;

    Sammanfattning : When designing a building, sound is one of the problems to take into account. Vibrating machines, such as ventilation fans, water pumps and compressors, generate structure-borne sound. The structure-borne sound travels up the structure of the building and generates sound in adjacent rooms. LÄS MER