Search for dissertations about: "pulsed current processing"

Showing result 1 - 5 of 10 swedish dissertations containing the words pulsed current processing.

  2. 1. Functionalization and processing of porous powders into hierarchically porous monoliths

    Author : Petr Vasiliev; Lennart Bergström; Yoshio Sakka; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Porous; zeolite; hierarchical; monolith; nanoparticle; functionalization; amorphization; PCP; SPS; pulsed current processing; spark plasma sintering.; Chemistry; Kemi; Inorganic Chemistry; oorganisk kemi;

    Abstract : Inorganic porous materials are widely used in a number of applications, where is a need to functionalize and produce materials with a multiscale porosity. The first part of the thesis describes how a novel and facile powder processing approach, using pulsed current processing (PCP) or, as it is commonly called, spark plasma sintering (SPS), has been employed to produce mechanically stable, hierarchically porous bodies from different porous powders. READ MORE

  4. 2. Automatic Quality Monitoring in GMA Welding using Signal Processing Methods

    Author : Stefan Adolfsson; Industriell Produktion; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material technology; F; Signal Processing; Automatic Quality Monitoring; GMA welding; Materiallära; materialteknik;

    Abstract : An ongoing continuous process of automatization of the production lines is used in industry to reduce production costs. Automatization of quality control should be seen as part of a cost reduction process, as well as of quality control of the welding. READ MORE

  5. 3. Structuring porous adsorbents and composites for gas separation and odor removal

    Author : Neda Keshavarzi; Lennart Bergström; Kurosch Rezwan; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Structure; pulsed current processing; zeolite; aluminophosphate; activated carbon; CO2 separation; adsorption; durability; cellulose; film; coating; Materials Chemistry; materialkemi;

    Abstract : Porous zeolite, carbon and aluminophosphate powders have been colloidally assembled and post-processed in the form of monoliths, flexible free standing films and coatings for gas separation and odor removal. Zeolite 13X monoliths with macroporosites up to 50 vol% and a high CO2 uptake were prepared by colloidal processing and sacrificial templating. READ MORE

  6. 4. Processing and performance of zeolites for efficient carbon dioxide separation

    Author : Arto Ojuva; Lennart Bergström; Viveka Alfredsson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Materials Chemistry; materialkemi;

    Abstract : We have structured zeolites from powders of zeolite 13X and 4A into hierarchically porous monoliths for efficient carbon dioxide capture by tailoring the pore dimensions to facilitate rapid gas uptake and release. Freeze-casting was used for the first time to shape adsorbents into a lamellar structure. READ MORE

  7. 5. Processing and Properties of Ferroelectric Ag(Ta,Nb)O3 Thin Films

    Author : Jung-Hyuk Koh; KTH; []
    Keywords : Ferroelectric; Thin Film; PLD; Tunable device;

    Abstract : High tunability and low loss tangent of ferroelectric thinfilms offer unique opportunity for the development of variousmicrowave devices. Silver tantalate niobate, which showsexcellent microwave properties, was selected for this study. READ MORE