Sökning: "radiation generation"

Visar resultat 16 - 20 av 179 avhandlingar innehållade orden radiation generation.

  1. 16. Noise radiation from drill steels : and other experimental investigations in acoustics and fluid mechanics

    Författare :Jan-Erik Ögren; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : Drill rod noise has become a major noise source in percussive drilling. Generation of flexural waves, which seem to be responsible for most of the noise, is studied in a model with dynamic photoelasticity and in the real drill rod with strain gauge technique. LÄS MER

  3. 17. Modelling of laser plasma interaction with applications

    Författare :Benjamin Svedung Wettervik; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; electron wakefield acceleration; ion acceleration; coherent X-ray pulses; plasma; Vlasov-Maxwell equations; continuum methods; radiation generation;

    Sammanfattning : The development of laser systems with ultra-high intensities has both opened up prospects for compact particle accelerators, as well as probing QED-effects, which are present in the high intensity regime. To describe laser matter interaction, it is necessary to self-consistently account for the paths of a large number of particles and the corresponding electromagnetic fields, with the addition of stochastic effects at high laser intensities. LÄS MER

  4. 18. Induction and repair of clustered DNA damage sites after exposure to ionizing radiation

    Författare :Andris Abramenkovs; Bo Stenerlöw; Peter O'Neill; Uppsala universitet; []
    Nyckelord :NHEJ; DSB repair; clustered DNA damage; DNA repair; DNA-PKcs; HSCS; Ra-223; ionizing radiation; Medicinsk vetenskap; Medical Science;

    Sammanfattning : The mechanisms that maintain genomic stability safeguard cells from constant DNA damage produced by endogenous and external stressors. Therefore, this thesis aimed to specifically address questions regarding the requirement and involvement of DNA repair proteins in the repair of various types of radiation-induced DNA damage. LÄS MER

  5. 19. Regional differences in the response of neural stem cells and their microenvironment to ionizing radiation

    Författare :Nina Hellström; Göteborgs universitet; []
    Nyckelord :ionizing radiation; neurogenesis; neural stem cells; inflammation; microglia; stem cell niche; trophic support;

    Sammanfattning : Radiation therapy is one of the most effective tools for treating malignant tumors; however, cranial irradiation often results in intellectual impairment and cognitive deficits, such as impaired learning and memory. Ionizing radiation generates DNA damage, causing proliferative cells to undergo apoptosis. LÄS MER

  7. 20. Experimental and modelling studies of radiative heat transfer in flames

    Författare :Daniel Bäckström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence-Radiation Interaction; Particle radiation; Radiative heat transfer;

    Sammanfattning : Combustion of solid fuels is used extensively for electricity generation purposes. However, combustion of fossil fuels leads to CO2 emissions which enhance the greenhouse gas effect. Carbon capture and storage (CCS) is a proposed solution where the CO2 is captured and stored instead of being emitted to the atmosphere. LÄS MER