Sökning: "eten"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet eten.

  1. 1. The Impact of Hydrocarbon and Carbon Oxide Impuritiesin the Hydrogen Feed of a PEM Fuel Cell

    Författare :Katrin Kortsdottir; Rakel Wreland Lindström; Göran Lindbergh; Tanja Kallio; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Fuel Cell; Hydrogen Impurities; Carbon Monoxide; Carbon Dioxide; Ethene; Propene; Methane; Propane; Toluene; Electrochemically Active Surface Area; Cyclic Voltammetry; Mass Spectrometry; bränslecell; vätgasföroreningar; kolmonoxid; koldioxid; eten; propen; metan; propan; toluen; elektrokemisk aktiv yta; cyklisk voltammetri; masspektrometri; Chemical Engineering; Kemiteknik;

    Sammanfattning : The proton exchange membrane fuel cell generates electricity from hydrogen and oxygen (from air) through electrocatalytic reactions in an electrochemical cell. The Pt/C catalyst, commonly used in PEM fuel cells, is very sensitive to impurities that can interact with the active catalyst sites and limit fuel cell performance. LÄS MER

  2. 2. Aluminium oxide - poly(ethylene-co-butylacrylate) nanocomposites : synthesis, structure, transport properties and long-term performance

    Författare :Patricia Nordell; Ulf Gedde; Lars Wågberg; Minna Hakkarainen; KTH; []
    Nyckelord :nanocomposite; nanoparticles; aluminium oxide; poly ethylene-co-butyl acrylate ; silanization; dispersion; Irganox 1010; antioxidant; OIT; sorption kinetics; water; nanokomposit; nanopartiklar; aluminium oxid; poly eten-co-butyl akrylat ; silanisering; dispergering; Irganox 1010; antioxidant; OIT; vattenupptag.;

    Sammanfattning : Polymer nanocomposites are promising materials for dielectrical use in high voltage applications and insulations. This work presents a study of nanocomposites based on poly(ethylene-co-butyl acrylate) with two different comonomer compositions and two different aluminium oxide nanoparticles. LÄS MER

  3. 3. Advances in SiC growth using chloride-based CVD

    Författare :Stefano Leone; Anne Henry; Erik Janzén; Calvin H. Jr Carter; Linköpings universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : Silicon Carbide (SiC) is a wide band-gap semiconductor. Similar to silicon it can be used to make electronic devices which can be employed in several applications. SiC has some unique features, such as wide band-gap, high hardness, chemical inertness, and capability to withstand high temperatures. LÄS MER

  4. 4. Poly(ethylene-graft-ethylene oxide) Preparation and Properties in Polymer Blends

    Författare :Åsa Halldén; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Surface modification; Graft copolymers; Polymer blends; Polyethylene; Polyethylene oxide; Polyamide; Polymer technology; biopolymers; Polymerteknik;

    Sammanfattning : This thesis describes the preparation, characterisation and properties of poly(ethylene-graft-ethylene oxide) (PE-PEO). The grafting reaction was carried out with the grafting onto method using the carboxylic acid groups of poly(ethylene-co-acrylic acid) (PEAA) as reactive sites in an esterification reaction with poly(ethylene oxide) mono-methyl ethers (MPEO) of varying molecular weights: 750, 2000 and 5000. LÄS MER

  5. 5. Optimization of Low-Level Controllers and High-Level Polymer Grade Changes

    Författare :Per-Ola Larsson; Institutionen för reglerteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; process control; PID control; robustness; noise sensitivity; dynamic optimization; polymerization; Modelica;

    Sammanfattning : Two design problems at different levels in the control hierarchy are considered; optimization of robust low-level controllers with constrained control signal activity and optimization of economical high-level polyethylene grade changes. As for the first design problem, a constraint on control signal activity due to measurement noise is presented and used when optimizing and comparing PI/PID controllers with measurement filters of different orders. LÄS MER