Sökning: "surface forces"

Visar resultat 16 - 20 av 406 avhandlingar innehållade orden surface forces.

1. 16. Conduction laser welding : modelling of melt pool with free surface deformation

   Författare :Josefine Svenungsson; Högskolan Väst; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Conduction laser welding; numerical modelling; Computational Fluid Dynamics; OpenFOAM; free surface deformation; melt pool; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

   Sammanfattning : Laser welding is commonly used in the automotive-, steel- and aerospace industry. It is a highly non-linear and coupled process where the weld geometry is strongly affected by the flow pattern in the melt pool. Experimental observations are challenging since the melt pool and melt flow below the surface are not yet accessible during welding. LÄS MER

3. 17. Simulations of directionality effects and optical forces in plasmonic nanostructures

   Författare :Vladimir Miljkovic; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Comsol multiphysics; optical forces; nanoparticles; nanowires; DDA; surface plasmons; Green’s function; Mie theory;

   Sammanfattning : With the rapid development of nanoscience and nanotechnology, surface plasmonics based on metal nanoparticles and nanostructures gain increasing interest, not only for fundamental scientific studies, but also for optical and sensor applications. At the nanoscale, the physical and chemical properties of metal particles, especially their optical properties, strongly depend on size and shape, as well as on the surrounding media and structures. LÄS MER

4. 18. Modification of polymeric particles via surface grafting for 3D scaffold design

   Författare :Robertus Wahyu Nayan Nugroho; Ann-Christine Albertsson; Orlando J. Rojas; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; surface grafting; PLA; PLLA; hydrophilic polymers; particles; geometry; steric stabilization; atomic force microscopy AFM ; polyelectrolyte multilayers; 3D scaffold; bone tissue engineering; surface degradation;

   Sammanfattning : Surface modification techniques have played important roles in various aspects of modern technology. They have been employed to improve substrates by altering surface physicochemical properties. LÄS MER

5. 19. On the Machining of Involute Helical Gears - Prediction models on tool geometry, cut gear tooth surface topography, chip geometry, and tool cutting forces

   Författare :Mattias Svahn; Maskinelement; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Gear hobbing; Gear milling; Chip geometry; Cutting forces; Surface topography; Tool wear;

   Sammanfattning : The modern requirements on power transmissions focus on energy efficiency, low noise and dynamic vibrations, and power density. In order to meet these requirements, the gear wheels must be manufactured to very high precision. Additionally, it should be economical to manufacture these gears within the tight requested tolerances. LÄS MER

7. 20. Surface Plasmon Photonics: From Optical Properties of Nanoparticles to Single Molecule Surface-enhanced Raman Scattering

   Författare :Hongxing Xu; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nanoparticles; nanostructures; Mie theory; surface plasmon; surface-enhanced Raman scattering; single molecule spectroscopy;

   Sammanfattning : With the rapid development of nanoscience and nanotechnology, surface plasmon photonics using metal nanoparticles and nanostructures gain increasing interest, not only for fundamental scientific studies, but also for electronic, optical, and sensor applications. In the nanoscale, the physical and chemical properties of metallic particles, especially their optical properties, strongly depend on size and shape, as well as on surrounding media and structures. LÄS MER