Search for dissertations about: "surface relief"

Showing result 1 - 5 of 29 swedish dissertations containing the words surface relief.

  1. 1. Mode and Polarization Control in VCSELs using Surface Structures

    Author : Åsa Haglund; [2005]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; single mode; dynamics; surface relief; Semiconductor laser; polarization; vertical-cavity surface-emitting laser; sub-wavelength grating; fabrication;

    Abstract : The vertical-cavity surface-emitting laser (VCSEL) is a novel, low-cost light source with many attractive performance characteristics, such as low operating current, circular output beam, and high modulation bandwidth at low currents. This together with its easy integration into two-dimensional arrays has made it an established transmitter in short-distance single and parallel fiber-optical links, and new applications are continuously arising. READ MORE

  2. 2. Vertical Cavity Surface Emitting Lasers for Access Network Applications

    Author : Emma Söderberg; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; highly strained InGaAs; single mode emission; Vertical Cavity Surface Emitting Lasers VCSELs ; inverted surface relief; high speed modulation;

    Abstract : .... READ MORE

  3. 3. Process chain simulation of forming, welding and heat treatment of Alloy 718

    University dissertation from Trollhättan : University West

    Author : Joachim Steffenburg-Nordenström; Högskolan Väst.; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forming; Welding; Stress relieve annealing; Heat treatment; Finite Element Simulation; Manufacturing process chain; Alloy 718; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Abstract : Manufacturing of aero engine components requires attention to residual stress and final shape of the product in order to meet high quality product standards.This sets very high demands on involved manufacturing steps to meet design requirements. READ MORE

  4. 4. Surface Energy Exchange and Hydrology of a Poor Sphagnum Mire

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Erik Kellner; Uppsala universitet.; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Sphagnum; Geovetenskap; myr; energibudget; ytresistans; vitmossa; hydrologiska modeller; TDR; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap; Hydrology; hydrologi;

    Abstract : Mires surface energy and water budgets govern the conditions for climatic, hydrological, ecological and carbon balance processes. The components of the water and surface energy budgets were quantified over two growing seasons for an open boreal mire. READ MORE

  5. 5. Surface Integrity of Broached Inconel 718 and Influence of Thermal Exposure

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Zhe Chen; Linköpings universitet.; Linköpings universitet.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Inconel 718 is a nickel-based superalloy that is extensively used as a disc material in gas turbine engines. The service life of gas turbine discs is normally governed by the modes of material degradation and fatigue failure since they work mostly at high temperatures and are subjected to cyclic mechanical loadings. READ MORE