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Visar resultat 1 - 5 av 72 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Fundamental in-situ and ex-situ studies of energy storage related materials including different applications of voltammetry

    Författare :Ulrik Palmqvist; Patrice Millet; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ni-Cd pocket plate batteries; b-Ni OH 2; b-NiOOH; failures; goethite; surface complexation; Pb II ; Zn II ; Cu II ; Cd II ; in-situ; carbon; nanostructured; voltammetry; X-ray diffraction; electrical test; potentiometry; TEM; chlorination; oorganisk kemi; Inorganic Chemistry;

    Sammanfattning : This thesis is a summary and discussion of eight papers dealing with failures and structural aspects of Ni-Cd industrial pocket plate batteries, applications of voltammetry in adsorption studies on goethite (a-FeOOH) surfaces and synthesis and characterisation of nanostructured carbons. The work consists of different areas of chemistry; electrochemistry, structural chemistry and solution chemistry. LÄS MER

  3. 2. Phase transformation and surface chemistry of secondary iron minerals formed from acid mine drainage

    Författare :Jörgen Jönsson; Lars Lövgren; Per Persson; Staffan Sjöberg; Douglas B Kent; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; schwertmannite; goethite; lepidocrocite; acid mine drainage; sulphate; natural organic matter; mineral surface; infrared spectroscopy; EXAFS; XRD; ternary surface complex; copper II ; cadmium II ; lead II ; zinc II ; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : The mining of sulphidic ore to extract metals such as zinc and copper produces huge quantities of waste material. The weathering and oxidation of the waste produces what is commonly known as Acid Mine Drainage (AMD), a dilute sulphuric acid rich in Fe(II) and heavy metals. LÄS MER

  4. 3. Refined crystal structures of Zn(II)- and Cu(II)-alcohol dehydrogenase : a comparative study

    Författare :Salam al-Karadaghi; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; strukturkemi; Structural Chemistry;

    Sammanfattning : The crystal structure of the ternary complex of horse liver alcohol dehydrogenase (LADH) with the coenzyme NADH and inhibitor dimethyl sulphoxide (DMSO) (space group PI) has been refined by simulated annealing with molecular dynamics and restrained positional refinement using the program system XPLOR. The resulting crystallographic R- factor is 17. LÄS MER

  5. 4. Studies of native and Cd(II)-substituted carbonic anhydrases with special reference to their interaction with inhibitors

    Författare :Lena Tibell; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Carbonic anhydrase; Cd II ; 113-Cd II -NMR; inhibition; catalytic mechanism;

    Sammanfattning : The major aim of this work has been to gain further insights into the catalytic mechanism of carbonic anhydrase (carbonate hydro-lyase, EC 4.2.1.1). LÄS MER

  7. 5. Fractionation of Fe and Zn isotopes : methods and some applications in aqueous geochemistry

    Författare :Dmitry Malinovskiy; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Applied Geology; Tillämpad geologi;

    Sammanfattning : Multiple collector inductively coupled plasma mass spectrometry (MC-ICPMS) has been used for the measurement of Fe and Zn isotope ratios in a variety of sample types including natural and synthetic waters, ferromanganese concretions, sediments and biological material. The focus of this PhD study was the development of analytical procedures for precise and accurate measurement of Fe and Zn isotope ratios by high resolution MC-ICPMS. LÄS MER