Search for dissertations about: "aem"

Showing result 1 - 5 of 7 swedish dissertations containing the word aem.

  2. 1. Quantifying ecological resilience in lakes – bridging theory and management

    Author : Didier Ludovic Baho; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Ecological resilience, defined as the capacity of an ecosystem to withstand disturbances without losing original structures, processes and functions, has remained elusive and challenging to quantify. In this thesis, two methods were used to assess the resilience of aquatic communities to different stressors and management practices. READ MORE

  4. 2. Poly(phenylene oxide)s functionalized with cationic side chains: design, synthesis and properties as anion exchange membranes

    Author : Hai-Son Dang; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; anion exchange membranes; Anion exchange membrane fuel cells; poly phenylene oxide s; hydroxide conductivity; alkaline stability; lithiation; Menshutkin reaction;

    Abstract : Anion exchange membrane fuel cells (AEMFCs) are considered as one of the most important next-generation energy conversion technologies. AEMFCs convert chemical energy into useful electrical energy and have great potential forachieving high conversion efficiencies. READ MORE

  5. 3. Quaternized fluorene-based hydroxide exchange membranes and polymers: design, synthesis, and characterization

    Author : Andrit Allushi; Centrum för analys och syntes; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; anion exchange membrane; hydroxide conductivity; alkaline stability; water electrolyzer; fuel cell;

    Abstract : In modern society, the consumption of fossil fuels has been increasing drastically, leading to significant emissions of carbondioxide (CO2), air pollution, global warming, and political and economic imbalances. This has increased the interest inrenewable and sustainable energy sources such as wind- and hydropower, solar energy, and in energy conversion by fuel celltechnology, and water electrolyses. READ MORE

  6. 4. Si-based structures for light emission and detection

    Author : Amir Karim; Göran Hansson; Wei-Xin Ni; Tom Gregorkiewicz; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Abstract : Efforts to improve the optical performance of the indirect bandgap semiconductor silicon (Si) has been a major subject of research in the field of Si photonics due to the promising applications of Si based light emitters and detectors for optical communication. With that motivation three different Si based material systems were investigated; Si:Er/O layered structures, SiGe quantum dots and SiSn nano structures, all grown using the technique of molecular beam epitaxy (MBE). READ MORE

  7. 5. Limiting processes in anion-exchange membrane fuel cells

    Author : Henrik Grimler; Göran Lindbergh; Rakel Wreland Lindström; Carina Lagergren; Marc Secanell; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; anion-exchange membrane fuel cell; hydrogen oxidation reaction; oxygen reduction reaction; water transport; physics-based modelling; Chemical Engineering; Kemiteknik;

    Abstract : Fuel cells allow for converting chemical energy stored in hydrogen into electrical energy, with only heat and water as by-products. In a sustainable energy society, hydrogen may play an important role due to its ability to act both as an energy carrier and as a valuable chemical in the process industry. READ MORE