Sökning: "Particle size"

Visar resultat 1 - 5 av 844 avhandlingar innehållade orden Particle size.

  1. 1. Particle Measurements Using Fluctuations in the Regular Transmittance of Light Through a Particle Dispersion : Concentration and Particles size - Theory, Measurement Principles and Applications for Pulp and Paper Production

    Författare :Staffan Rydefalk; Lars Mattsson; John Gregory; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Particle concentration; Particle size; Cylindrical particles; Large particles; Cellulose fibres; Wood pulp fibres; Suspensions; Particle length; Particle length distribution; Particle width; Manufacturing engineering; Produktionsteknik;

    Sammanfattning : The regular transmittance of light or similar radiation through a flowing suspension of particles fluctuates because of the random occurrence of particles in the beam.In the work presented here, a theory for this fluctuating behaviour with the emphasison dispersions of mm-length slender cylindrical particles having circular crosssections is given. LÄS MER

  2. 2. Particle transport in human lung : effects of particle size and shape

    Författare :Sofie Högberg; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : Recent studies have shown that nanoparticles may be more toxic than larger particles of the same material, but the health risks associated with widespread use largely depend on the extent of exposure. When dealing with potentially toxic particles, precautionary measures have to be taken in order to minimize contact. LÄS MER

  3. 3. Particle concentrations : analysis methods for urban runoff

    Författare :Kerstin Nordqvist; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; VA-teknik; Urban Water Engineering;

    Sammanfattning : Urban runoff often contains high concentrations of particles. Pollutants that adsorbs to surfaces of particulate material will be transported to receiving waters or a sewage treatment plant. For the recipient, the particles in the runoff are a significant cause of water quality impairment. LÄS MER

  4. 4. Particle dynamics during biomass devolatilization : Momentum exchange and particle dispersion

    Författare :Angel David Garcia Llamas; Kentaro Umeki; Rikard Gebart; Per Gren; Peter Glarborg; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biomass; devolatilization; rocketing; PIV; PTV; Energiteknik; Energy Engineering;

    Sammanfattning : Devolatilization is a heat-driven thermochemical process in which a liquid or a solid fuel releases mass in the form of volatile compounds after drying, as a result of the combination of endothermic and exothermic reactions. It differs from pyrolysis in that it does not require an inert atmosphere and that the reactant must be either solid or liquid. LÄS MER

  5. 5. Particle Characterization in the Exhaust Devices of Direct Injection Engines

    Författare :Arun Prasath Karuppasamy; Anders Christiansen Erlandsson; Hanna Bernemyr; Alexander Bergmann; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Particle number; Particle size distribution; turbocharger; SCR; Exhaust after-treatment system; Particle dilution and conditioning; Partikelantal; storleksfördelning av partiklar; turboladdare; SCR; efterbehandlingssystem; avgasbehandlingssystem; partikelspädning och partikelanpassad mätmetod; Machine Design; Maskinkonstruktion;

    Sammanfattning : Minimizing pollutants are of utmost importance to ensure sustainability in transportation. Particle emissions from internal combustion engines are especially harmful to human health, while also contributing to global warming. LÄS MER