Sökning: "ultrafine particles"

Visar resultat 16 - 20 av 34 avhandlingar innehållade orden ultrafine particles.

  1. 16. A study of airborne wear particles from automotive disc brakes

    Författare :Jens Wahlström; Ulf Olofsson; Werner Österle; KTH; []
    Nyckelord :Disc brakes; Airborne wear particles; Nanoparticles; Cellular automaton; Mechanical engineering; Maskinteknik;

    Sammanfattning : During braking, both the disc and pads in disc brakes are worn. Since disc brakes are not sealed,some of the wear particles generated can become airborne. LÄS MER

  3. 17. Innate immune airway responses after exposure to ultrafine and ambient particles : in vivo and in vitro models

    Författare :Anna Steneholm; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Inhalation of ultrafine and ambient particles in the air triggers a response in the innate immune system of the airways. This thesis explores measures to reduce exposure to organic dust, to dampen the adverse immune effects of chronic organic swine dust exposure and develop a refined in vitro bronchial mucosa model to reduce in vivo toxicity testing on humans and animals. LÄS MER

  4. 18. Emissions, dynamics and dispersion of particles in polluted air

    Författare :Lars Gidhagen; Hans-Christen Hansson; Christer Johansson; Joakim Langner; Øystein Hov; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Meteorology; Meteorologi;

    Sammanfattning : The main objective of this thesis is to yield information on how atmospheric fine and ultrafine particles are dispersed in populated areas. Quantitative information on emissions, transport and removal is needed to assess the health risks of inhalable particles. LÄS MER

  5. 19. Fine and ultrafine particle exposure: Health effects and biomarkers

    Författare :Yiyi Xu; Avdelningen för arbets- och miljömedicin; []
    Nyckelord :particulate matter; Occupational Exposure : adverse effects; mitochondrial dna; telomere length;

    Sammanfattning : Particle, especially fine and ultrafine particle exposure has been linked to lower airway infections, asthma, chronic obstructive pulmonary disease (COPD), ischemic heart disease, stroke and cancer. The underlying mechanisms are under active investigation, and are still not fully understood. LÄS MER

  7. 20. Studies of aerosol particle formation from various sources using ion and electron beam analytical techniques

    Författare :Arash Gharibi; Fysiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; GUPIX; TEM; SEM; EDX; biomass combustion; traffic; road; jet droplets; film droplets; Physics; Nuclear physics; Fysik; Kärnfysik; pollution control; Environmental technology; Aerosol particles; PIXE; sources emission; tire; Arctic; Miljöteknik; kontroll av utsläpp; Fysicumarkivet A:000;

    Sammanfattning : The thesis presents the results of studies of aerosol particle formation using ion and electron beam analytical techniques. The sources of aerosol particle formation studied are the following: 1. production of primary aerosol particles in the high Arctic region during summers 2. LÄS MER