Search for dissertations about: "cathode layer"

Showing result 1 - 5 of 50 swedish dissertations containing the words cathode layer.

  1. 1. Modelling of cathode-plasma interaction in short high-intensity electric arc : Application to Gas Tungsten Arc Welding

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Alireza Javidi Shirvan; Isabelle Choquet; Håkan Nilsson; Armelle Vardelle; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric arc discharge; sheath; pre-sheath; Knudsen layer; doped refractory cathode; arc-cathode coupling; Gas Tungsten Arc simulation; OpenFOAM.; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Abstract : In arc welding the quality of the weld is strongly influenced by the thermal history of the workpiece which is itself governed by the electric arc heat source. The models for predicting weld properties thus need a good evaluation of the distribution of the heat input from thearc to the workpiece. READ MORE

  2. 2. Modelling of cathode-plasma interaction in short high-intensity electric arc - Application to Gas Tungsten Arc Welding

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Alireza Javidi-Shirvan; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; sheath; Gas Tungsten Arc simulation; doped refractory cathode; Knudsen layer; electric arc discharge; OpenFOAM.; pre-sheath; arc-cathode coupling;

    Abstract : In arc welding the quality of the weld is strongly influenced by the thermal history of the workpiece which is itself governed by the electric arc heat source. The models for predicting weld properties thus need a good evaluation of the distribution of the heat input from the arc to the workpiece. READ MORE

  3. 3. LiFeSO4F as a Cathode Material for Lithium-Ion Batteries Synthesis, Structure, and Function

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Adam Sobkowiak; Fredrik Björefors; Kristina Edström; Anna Andersson; M. Rosa Palacin; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Li-ion battery; cathode; LiFeSO4F; tavorite; triplite; synthesis; performance; structure; coating; PEDOT; XRD; Mössbauer spectrocopy; SEM; TEM; electrochemistry; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Abstract : In this thesis, two recently discovered polymorphs of LiFeSO4F, adopting a tavorite- and triplite-type structure, were investigated as potential candidates for use as cathode materials in Li-ion batteries. The studies aimed at enriching the fundamental understanding of the synthetic preparations, structural properties, and electrochemical functionality of these materials. READ MORE

  4. 4. LiMn2O4 as a Li-ion Battery Cathode. From Bulk to Electrolyte Interface

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Tom Eriksson; Michael M. Thackeray; [2001]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; cathode materials; lithium manganese oxide; interface; surface layer; electrode kinetics; Kemi; NATURAL SCIENCES Chemistry; NATURVETENSKAP Kemi; Inorganic Chemistry; oorganisk kemi;

    Abstract : LiMn2O4 is ideal as a high-capacity Li-ion battery cathode material by virtue of its low toxicity, low cost, and the high natural abundance of Mn. Surface related reactions and bulk kinetics have been the major focus of this work. READ MORE

  5. 5. Modelling of Electric Arc Welding: arc-electrode coupling

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Alireza Javidi-Shirvan; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sheath; cathode layer; plasma; arc welding simulation; arc discharge;

    Abstract : Arc welding still requires deeper process understanding and more accurate prediction of the heat transferred to the base metal. This can be provided by CFD modelling.Most works done to model arc discharge using CFD consider the arc core alone. READ MORE