Search for dissertations about: "fractal"

Showing result 1 - 5 of 82 swedish dissertations containing the word fractal.

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

    Author : Sihem Jebari; [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; Börje Johansson; Vladimir Karlin; [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; Börje Johansson; R. J. M. (Rob) Bastiaans; [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. Electrical Properties of Carbon Black Polymer Composites: Filler Particle Rearrangement

    University dissertation from Stockholm : KTH

    Author : Karl Michael Jäger; [2001]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; conductivity; fractal; permittivity; carbon black; dielectric; electron tunnelling; polymer; image analysis; cluster; percolation;

    Abstract : The practical application of semi-conducting carbon black polymer composites often involves temperature variations resulting in changes in their electrical properties. Study of cross-linked ethylene butylacrylate copolymer (EBA) filled with acetylene black has shown that these changes are due to carbon black network re-arrangement. READ MORE

  5. 5. Functional modelling of the human timing mechanism

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Guy Madison; [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