Search for dissertations about: "transition thresholds"

Showing result 1 - 5 of 17 swedish dissertations containing the words transition thresholds.

  2. 1. Numerical studies of transtion in wall-bounded flows

    Author : Ori Levin; Dan Henningson; Nikolaus Adams; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; boundary layer; suction; wall jet; streaks; waves; periodic disturbance; localized disturbance; turbulent spot; algebraic growth; exponential growth; stability; transition thresholds; transition prediction; PSE; DNS; Fluid mechanics; Strömningsmekanik;

    Abstract : Disturbances introduced in wall-bounded flows can grow and lead to transition from laminar to turbulent flow. In order to reduce losses or enhance mixing in energy systems, a fundamental understanding of the flow stability and transition mechanism is important. READ MORE

  4. 2. Rapid Urbanization : An Inquiry into the Nature and Causes of the Urban Transition in Developing Countries

    Author : Kyle Farrell; Hans Westlund; Tigran Haas; Peter Nijkamp; Kingsley Haynes; KTH; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; urban transition; rapid urbanization; rapid urban growth; components of urban growth; economic development; developing countries; national urban systems; China; Nigeria; India; Planering och beslutsanalys; Planning and Decision Analysis;

    Abstract : This thesis is concerned with the challenges posed by the contemporary urban narrative in developing countries. It is premised on the notion of the urban transition, which posits that as a country develops it undergoes a transformation from a predominantly rural society to a predominantly urban one. READ MORE

  5. 3. Stability and transition in the suction boundary layer and other shear flows

    Author : Niklas Davidsson; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Abstract : Bypass transition has been studied by theoretical and numerical procedures, with the asymptotic suction boundary layer (ASBL) in focus. As reference cases the Blasius boundary layer (BBL) and a free shear flow have been studied. In order to reduce energy losses associated with flow systems, it is a wish to avoid turbulence in these flows. READ MORE

  6. 4. Upper Secondary Education: Access, Choices and Graduation

    Author : Vivika Halapuu; Lena Hensvik; Oskar Nordström Skans; Sandra McNally; Uppsala universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Upper secondary education; Vocational education; Access to education; School choice; Skill inputs; High school performance; Graduation standards; School-to-work transition; Job match quality; Disability insurance; Education policy; Economics; Nationalekonomi;

    Abstract : Essay I: We study how Swedish high school students match with programs given their skill endowments at the time of choosing. Using detailed administrative data on high school admissions and earlier school achievement, we construct a multidimensional measure of program match quality, reflecting the extent to which students select into programs with skill requirements that align with their skill portfolio. READ MORE

  7. 5. Essays on nonlinear time series modelling och hypothesis testing

    Author : Birgit Strikholm; Handelshögskolan i Stockholm; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : There seems to be a common understanding nowadays that the economy is nonlinear. Economic theory suggests features that can not be incorporated into linear frameworks, and over the decades a solid body of empirical evidence of nonlinearities in economic time series has been gathered. READ MORE