Sökning: "radiation attenuation"

Visar resultat 1 - 5 av 28 uppsatser innehållade orden radiation attenuation.

  1. 1. Faraday cage för förvaring av hemelektronik och EMF-dämpning

    Kandidat-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Arianne Östlund; [2023]
    Nyckelord :;

    Sammanfattning : Elektromagnetiska fält (EMF) finns överallt. De är naturligt förekommande, men teknik orsakar allt fler konstgjorda fält i olika styrkor ovanpå dessa. LÄS MER

  3. 2. Development of a computational method for determining gamma energy escape from calorimeters at CLAB

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

    Författare :Amela Mehic; [2022]
    Nyckelord :Nuclear physics; Calorimeter; SNF; MCNP; Dose rate; CLAB; Gamma energy; Fuel assembly; Form function; Attenuation coefficient; Gamma spectroscopy;

    Sammanfattning : Swedish Nuclear Fuel and Waste Management Company- SKB has conducted measurement campaigns at the Swedish central interim storage facility for spent nuclear fuel- CLAB over the years, extending from year 2003 to 2019 where the gamma energy escape was acquired. At CLAB the spent nuclear fuel assembly is inserted into the calorimeter; device intended to measure temperature increase due to decay heat from the fuel assembly. LÄS MER

  4. 3. Atmospheric Attenuation for Lidar Systems in Adverse Weather Conditions

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

    Författare :Johan Viklund; [2021]
    Nyckelord :Lidar; Lidar equation; Extinction coefficient; Signal attenuation;

    Sammanfattning : In this study, the weather impact on lidar signals has been researched. A lidar system was placed with a target at approximately 90 m and has together with a weather station collected data for about a year before this study. LÄS MER

  5. 4. Millimeter-Wave Pencil Beam Leaky-Wave Antenna

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

    Författare :Tom Eriksson; Erik Westberg; [2021]
    Nyckelord :Leaky-wave antenna LWA ; Continuous transverse stubs CTS ; Parallel plate waveguide PPW ; Dispersion;

    Sammanfattning : Moving into higher frequencies, in occurrence withmodern applications, poses the issue of higher attenuation ofelectromagnetic waves, which in turn demand more directiveantennas. This paper proposes a directive antenna designoperating at 30GHz based on leaky-wave technology. Themodel consists of two main components. LÄS MER

  7. 5. Implementation of the Weighted Filtered Backprojection Algorithm in the Dual-Energy Iterative Algorithm DIRA-3D

    Master-uppsats, Linköpings universitet/Institutionen för systemteknik

    Författare :Markus Tuvesson; [2021]
    Nyckelord :wFBP; weighted Filtered Backprojection; DIRA-3D;

    Sammanfattning : DIRA-3D is an iterative model-based reconstruction method for dual-energy helical CT whose goal is to determine the material composition of the patient from accurate linear attenuation coefficients (LACs). Possible applications are, for example, to aid in calculations of radiation transport and dose calculations in brachytherapy with low energy photons, and in proton therapy. LÄS MER