Sökning: "laser vaporisation"

Hittade 5 avhandlingar innehållade orden laser vaporisation.

  1. 1. Pulsed laser ablation studied using digital holography

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Eynas Amer; Luleå tekniska universitet.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Experimental Mechanics; Experimentell mekanik;

    Sammanfattning : Pulsed digital holographic interferometry has been used to study the plume and the shock wave generated in the laser ablation process on different targets under atmospheric air pressure. A pulsed Nd-YAG laser system (pulse duration 12 ns) has been used both for ablating the material (wavelength 1064 nm) and for measurement (wavelength 532 nm). LÄS MER

  2. 2. In-Cylinder Fluid Flow, Fuel Preparation and Combustion in SI Engines - Application of Optical Diagnostics

    Detta är en avhandling från Ann-Britt Sundström, Ole Römers v. 1, 221 00 Lund, Sweden

    Författare :Martin Ekenberg; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Laserteknik; vakuumteknik; vibrationer; akustik; Motors and propulsion systems; Motorer; hydraulik; Maskinteknik; PIV; vibration and acoustic engineering; hydraulics; vacuum technology; Mechanical engineering; framdrivningssystem; Laser technology;

    Sammanfattning : In this thesis laser-based measurements of in-cylinder flow and fuel concentrations in two stroke and direct injected four-stroke engines are presented. The major problem with the carburetted two-stroke engine is the short-circuiting of fuel that occurs during the scavenging phase. This leads to large emissions of unburned hydrocarbons. LÄS MER

  3. 3. Hidradenitis suppurativa : With special reference to carbon dioxide laser surgery

    Detta är en avhandling från Stockholm : Karolinska Institutet, Department of Medicine at Huddinge University Hospital

    Författare :Jan Lapins; Karolinska Institutet.; Karolinska Institutet.; [2001]

    Sammanfattning : Hidradenitis suppurativa (HS) is a chronic inflammatory disease with recurrent abscesses. In most cases, it involves the axillar and anogenital regions. In industrialised countries, the prevalence is of 0.3% to 4%, and the disease is over-represented in young adult females. LÄS MER

  4. 4. Applications of pulsed lasers for phase transformation and welding

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Istvan Sarady; [1993]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manufacturing Systems Engineering; Produktionsutveckling;

    Sammanfattning : This work deals with the interaction of pulsed laser radiation with solid, metallic materials at moderate and very high power densities. The interaction mechanism depends upon the properties of both the laser and the target material. LÄS MER

  5. 5. Spark Assisted Compression Ignition, SACI

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Håkan Persson; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flame propagation; PLIF; LDV; chemiluminescence imaging; residuals; negative valve overlap; low temperature combustion; SACI; spark assistance; HCCI; turbulence; charge stratification; cycle to cycle;

    Sammanfattning : The strong focus on decreasing carbon dioxide emissions due to limited natural resources of fossil fuel as well as alarming climate changes drives the research and development of our prime mover, the combustion engine, faster then ever. The minimum requirement is a power source with increased efficiency while emitting ultra low levels of hazardous local and regional emissions. LÄS MER