Search for dissertations about: "fractal"

Showing result 1 - 5 of 75 swedish dissertations containing the word fractal.

  1. 1. Water Erosion Modelling using Fractal Rainfall Disaggregation, a Study in Semiarid Tunisia

    Author : Sihem Jebari; Lunds universitet.; Lund University.; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Soil erosion; semiarid; Tunisia; rainfall; fractal; diaggregation;

    Abstract : In the Tunisian semiarid area, water erosion processes have led to negative economic and environmental consequences in a context of limited water resources. To characterize and predict these degradation phenomena, a comprehensive high-resolution data base on erosive rainfall, together with siltation records for 28 small reservoirs were analyzed. READ MORE

  2. 2. The role of Landau-Darrieus instability in flame dynamics and deflagration-to-detonation transition

    University dissertation from Stockholm : KTH

    Author : Damir Valiev; KTH.; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flame; premixed; instability; front; Landau; Darrieus; fractal; freely; deflagration; detonation; transition; DDT; modeling; simulation; TECHNOLOGY Materials science Other materials science; TEKNIKVETENSKAP Teknisk materialvetenskap Övrig teknisk materialvetenskap;

    Abstract : The role of intrinsic hydrodynamic instability of the premixed flame (known as Landau-Darrieus instability) in various flame phenomena is studied by means of direct numerical simulations of the complete system of hydrodynamic equations. Rigorous study of flame dynamics and effect of Landau-Darrieus instability is essential for all premixed combustion problems where multidimensional effects cannot be disregarded. READ MORE

  3. 3. Flame Dynamics and Deflagration-to-Detonation Transition

    University dissertation from Stockholm : KTH

    Author : Damir Valiev; KTH.; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; flame; premixed; instability; fractal; deflagration; detonation; DDT; simulation; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : Various premixed flame phenomena are studied by means of direct numerical simulations of the complete system of hydrodynamic equations. Rigorous study of flame dynamics is essential for all premixed combustion problems where multidimensional effects cannot be disregarded.The present thesis consists of six parts. READ MORE

  4. 4. Functional modelling of the human timing mechanism

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Guy Madison; Uppsala universitet.; [2001]
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Psychology; Brain mechanisms; Brownian motion; drift; dynamical systems; fractal; human; Gaussian noise; Hurst exponent; time; time series analysis; timing; Psykologi; SOCIAL SCIENCES Social sciences Psychology; SAMHÄLLSVETENSKAP Socialvetenskap Psykologi; fysiologi; Physiology;

    Abstract : Behaviour occurs in time, and precise timing in the range of seconds and fractions of seconds is for most living organisms necessary for successful interaction with the environment. Our ability to time discrete actions and to predict events on the basis of prior events indicates the existence of an internal timing mechanism. READ MORE

  5. 5. Nonlinear elliptic problems with boundary blow-up

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Jerk Matero; Uppsala universitet.; [1997]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematics; Boundary blow-up; NTA domain; fractal; p-Laplaceoperator; Mange-Ampère operator; viscosity solution; mean curvature flow; gradient estimate; Fefferman s equation; superdiffusion; entire solution; maximum principle; Primary 35J65; MATEMATIK; MATHEMATICS; MATEMATIK; matematik; Mathematics;

    Abstract : A classical problem in differential geometry is the prescribed curvature problemin a bounded domain, where the task is to conformally deform the Euclidean metric to another complete Riemannian metric with a prescribed curvature function.If this function is negative, the problem is equivalent to solving a nonlinear elliptic partial differential equation with boundary blow-up. READ MORE