Sökning: "CO laser"

Visar resultat 16 - 20 av 119 avhandlingar innehållade orden CO laser.

1. 16. Laser-Based Techniques for Combustion Diagnostics

   Författare :Nikola Georgiev; Förbränningsfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; LIF; Laser-based diagnostic techniques; PS; DFWM; Fysik; Fysicumarkivet A:1997:Georgiev;

   Sammanfattning : Two-photon-induced Degenerate Four-Wave Mixing, DFWM, was applied for the first time to the detection of CO, and NH3 molecules. Measurements were performed in a cell, and in atmospheric-pressure flames. In the cell measurements, the signal dependence on the pressure and on the laser beam intensity was studied. LÄS MER

3. 17. Operando Gas Imaging in Heterogeneous Catalysis

   Författare :Jianfeng Zhou; Förbränningsfysik; []
   Nyckelord :planar laser-induced fluoresence; degenerate four wave mixing; gas phase; CO oxidation; model catalyst; hetergeneous catalysis; laser-diagnostiska tekniker; gasfasdetektering; modellkatalys; heterogen katalys;

   Sammanfattning : This thesis deals with the development and application of laser-based techniques, for gas phasecharacterization/gas imaging in heterogeneous catalysis. Two techniques are presented: planar laser-induced fluorescence (PLIF) and degenerate four wave mixing (DFWM). LÄS MER

4. 18. Numerical and Experimental Studies of Wakefield Accelerators

   Författare :Henrik Ekerfelt; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; laser wakefield acceleration; betatron radiation; ionization-induced trapping; density down-ramp trapping; colliding pulse injection; direct laser acceleration; laser wakefield merging; particle-in-cell simulations; high-intensity optics; Fysicumarkivet A:2019:Ekerfelt;

   Sammanfattning : This thesis is based on work done by the author on the development of laser wakefield accelerators.Wakefield acceleration in plasmas is a promising technique to provide the next generation of accelerating structures and particle beams. LÄS MER

5. 19. Use of EBSD Technique as a Means to Investigate the Microstructure of Engineering Materials

   Författare :Muhammad Umar Farooq; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; laser cladding; coronary stents.; strain induced phase transformation; EBSD; oligocrystalline structures; WC-Co;

   Sammanfattning : AbstractMaterials Science and Engineering has the aim to design or engineer the structure of a material to produce a predetermined set of properties. To be able to understand and predict the properties and observable characteristics of engineering materials, it is therefore necessary to understand their microstructure. LÄS MER

7. 20. On the Mechanisms behind the Tribological Performance of Stellites

   Författare :Daniel H. E. Persson; Sture Hogmark; Staffan Jacobson; Mikael Olsson; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Stellite; Co-based; phase transformation; fcc; hcp; texture; alignment; low-friction; laser cladding; Materialvetenskap; Materials science; Teknisk materialvetenskap;

   Sammanfattning : This thesis reveals the tribological mechanisms behind the intrinsic low friction potential of the Co-based family of alloys called Stellites. Although being an established and important group of materials, a satisfactory explanation to why they exhibit low-friction properties under severe sliding conditions has not previously been found in the literature. LÄS MER