Sökning: "secondary electrons"

Visar resultat 1 - 5 av 14 uppsatser innehållade orden secondary electrons.

  1. 1. Geological characterization of rock samples by LIBS and ME-XRT analytical techniques

    Master-uppsats, Luleå tekniska universitet/Geovetenskap och miljöteknik

    Författare :Nsioh Elvis Nkioh; [2022]
    Nyckelord :geological characterization; analytical techniques; LIBS; ME-XRT; SEM; element maps; SEM-EDS; secondary electrons; rock samples; automated ore microscopy; SEM-Zeiss Merlin; element weight percentages; element oxide percentages; scanning techniques; analytical methods; laser induced breakdown spectrometry; multi energy x-ray transmission; scanning electron microscope; carbon coating; mineralogical classification; element composition; rock chemistry; rock chemical composition;

    Sammanfattning : One of the major challenges in earth sciences and mineral exploration has been to determine with high accuracy and at a fast rate the elemental composition as well as the general chemistry of a rock sample. Many analytical techniques e.g. LÄS MER

  3. 2. X-ray Photoelectron Spectroscopy on Clusters: From Water Clusters to Metal & Metal-Oxide Nanoparticles

    Master-uppsats, Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Författare :Emmanouil Tzomos; [2021]
    Nyckelord :Nanoscience; Nanoparticles; Clusters; Synchrotron Radiation; Water Particles; Silver Particles; Silver Oxides; Ethylene Epoxidation; Radiotherapy; PES; XPS; Lund University; FlexPES; MAX IV; Physics and Astronomy;

    Sammanfattning : In the present work, two experimental setups aimed at the production of (1) water clusters and (2) metal-oxide nanoparticles were assembled and commissioned. The experiments on the cluster/nanoparticle beams were set up and performed at the FlexPES beamline of the MAX-IV synchrotron facility. LÄS MER

  4. 3. Applications and Limitations of the Hybrid L1/L2Multicarrier Analysis Method

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Alexandra Janzon; [2021]
    Nyckelord :Multipaction; multipactor; RF; radio-frequency;

    Sammanfattning : The multipactor phenomenon is a major concern in modern satellites that operate with highpower transmission in many frequency bands. It occurs when electrons inside RF componentsare accelerated by the RF fields. These electrons then hit walls inside the device, produc-ing secondary electrons. LÄS MER

  5. 4. Secondary aerosol formation from dimethyl sulfide - Smog chamber experiments and detailed process modelling

    Kandidat-uppsats, Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

    Författare :Dana Lüdemann; [2020]
    Nyckelord :aerosol modelling; atmospheric physics and chemistry; marine aerosols; ADCHAM; aerosol; dimethyl sulfide; Physics and Astronomy;

    Sammanfattning : The aim of this thesis was to investigate the secondary aerosol formation from dimethylsulfide (DMS) using the aerosol dynamics, gas- and particle-phase chemistry kinetic multi-layer model, ADCHAM. The first simulations, concerning the butanol oxidation via hydroxyl radicals (OH), were performed to characterize the UV-light source of the AURA smog chamber (Aarhus university, Denmark), later used for the DMS experiments. LÄS MER

  7. 5. How do iodized nucleotides fragment due to photoactivation?

    Kandidat-uppsats, Uppsala universitet/Materialteori

    Författare :Ebba Koerfer; [2020]
    Nyckelord :Radiation therapy; radioactive iodine treatment; fragmentation; DNA;

    Sammanfattning : Cancer is the second leading cause of death worldwide and affects millions of people every year. Furthermore, the available treatments often lead to severe side effects, thus improving radiation treatment is meaningful. LÄS MER