Search for dissertations about: "phosphorus diffusion"

Showing result 1 - 5 of 14 swedish dissertations containing the words phosphorus diffusion.

  2. 1. Predictive Modeling of Lake Eutrophication

    Author : Jan Mikael Malmaeus; Lars Håkanson; Kurt Pettersson; Jürg Bloesch; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; mass balance model; dynamic model; mechanistic model; phosphorus; LEEDS; suspended particulate matter; settling velocity; sedimentation; accumulation sediments; burial; diffusion; climate scenario; Erken; Balaton; Kinneret; Batorino; Miastro; Naroch; Galten; Ekoln; Geovetenskap; Earth sciences; Geovetenskap;

    Abstract : This thesis presents predictive models for important variables concerning eutrophication effects in lakes. The keystone is a dynamic phosphorus model based on ordinary differential equations. READ MORE

  4. 2. Electrical Properties of Gold-related Defect Complexes in Silicon

    Author : Einar Sveinbjörnsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DLTS; gettering; Au in Si; lithium diffusion; Au-H complexes; Au-Li complexes; deep levels; phosphorus diffusion; hydrogen in silicon;

    Abstract : This thesis describes three extensive experiments concerning the properties of gold as an impurity atom in crystalline silicon. The first study is an investigation of the effect of phosphorus diffusion on the distribution of gold atoms within a silicon crystal. READ MORE

  5. 3. Multiscale modeling of atomic transport phenomena in ferritic steels

    Author : Luca Messina; Pär Olsson; Nils Sandberg; Pål Efsing; Pascal Bellon; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; diffusion; impurities; iron; metals; kinetic Monte Carlo; ab initio; mean field; defects; embrittlement; reactor pressure vessel; neural networks; Fysik; Physics;

    Abstract : Defect-driven transport of impurities plays a key role in the microstructure evolution of alloys, and has a great impact on the mechanical properties at the macroscopic scale. This phenomenon is greatly enhanced in irradiated materials because of the large amount of radiation-induced crystal defects (vacancies and interstitials). READ MORE

  6. 4. Phosphorus transport and reduction in compact-bed filters : simulations and experiments

    Author : Amir Jourak; Andy George; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Abstract : Excessive release of phosphorus from the effluent of on-site sanitation facilities to the environment is one source of aquatic pollution. The primary effect of excess phosphorus in the aquatic environment is eutrophication. READ MORE

  7. 5. The role of sediments in nitrogen cycling in the larger Baltic Sea

    Author : Anne Stockenberg; Lars Peter Nielsen; Stockholms universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Microbiology; Mikrobiologi; mikrobiologi; Microbiology;

    Abstract : The eutrophication of coastal areas has become a widespread problem over the last decades. In the Baltic Sea, the input of nitrogen and phosphorus has increased by four and eight times, respectively, since the turn of the century, and this is considered the direct cause of the eutrophication of this ecosystem. READ MORE