Sökning: "Järn"

Visar resultat 51 - 55 av 129 avhandlingar innehållade ordet Järn.

  1. 51. Application of Wastes from Pulp and Paper Industries for Steelmaking Processes

    Författare :Tova Jarnerud; Andrey Karasev; Pär Jönsson; Carl-Erik Grip; KTH; []
    Nyckelord :Teknisk materialvetenskap; Materials Science and Engineering;

    Sammanfattning : Over the past several years, considerable efforts have been made to develop a more circular economy. The ambition to reuse, remanu­facture and recycle materials is of great significance for the establish­ment of a sustainable society. LÄS MER

  3. 52. Ferrochelatase and Magnesiumchelatase: Metal chelation studied with mutants

    Författare :Ulf Olsson; Biokemi och Strukturbiologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biochemistry; chlorophyll; heme; barley; mutants; Magnesium chelatase; ferrochelatase; Metabolism; Biokemi; metabolism;

    Sammanfattning : Magnesium chelatase and ferrochelatase are two very important enzymes, which are involved in chlorophyll and heme biosynthesis, respectively. They both use protoporphyrin IX as substrate but magnesium chelatase inserts a magnesium ion whereas ferrochelatase inserts a ferrous ion. These two enzymes have been studied in this thesis. LÄS MER

  4. 53. Iron Carbonyl Clusters as Proton Reduction Catalysts

    Författare :Ahibur Rahaman; Kemisk fysik; []
    Nyckelord :iron-only hydrogenase; phosphine-substitution; electrocatalysis; proton reduction;

    Sammanfattning : Abstract – The mixed-valence triiron complexes [Fe3(CO)7-x(PPh3)x(µ-edt)2] (x = 0, 1, 2; edt = SCH2CH2S) and [Fe3(CO)5(κ2-diphosphine)(µ-edt)2] (diphosphine = dppv, dppe, dppb, dppn) have been prepared and structurally characterized. In comparison to the diiron complex [Fe2(CO)6(µ-edt)], [Fe3(CO)7(µ-edt)2] catalyzes proton reduction at 0. LÄS MER

  5. 54. Methods for Testing and Analyzing Lithium-Ion Battery Cells intended for Heavy-Duty Hybrid Electric Vehicles

    Författare :Pontus Svens; Göran Lindbergh; Mårten Behm; Søren Juhl Andreasen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Li-ion; battery; hybrid electric vehicle; Chemical Engineering; Kemiteknik;

    Sammanfattning : Lithium-ion batteries designed for use in heavy-duty hybrid vehicles are continuously improved in terms of performance and longevity, but they still have limitations that need to be considered when developing new hybrid vehicles.               The aim of this thesis has been to study and evaluate potential test and analysis methods suitable for being used in the design process when maximizing lifetime and utilization of batteries in heavy-duty hybrid vehicles. LÄS MER

  7. 55. Carbon-based magnetic nanomaterials

    Författare :Valeria Zagaynova; Tatiana Makarova; Mauro Ricco; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; carbon nanotube; fullerene; single molecular magnet; Mn12; graphite fluoride; nanoporous carbon; molecular magnetism; magnetic properties; SQUID magnetometry; x-ray diffraction; Raman spectroscopy; Materials Science; materialvetenskap;

    Sammanfattning : Magnetism of carbon-based materials is a challenging area for both fundamental research and possible applications. We present studies of low-dimensional carbon-based magnetic systems (fullerene-diluted molecular magnets, carbon nanotubes, graphite fluoride, and nanoporous carbon) by means of SQUID magnetometer, X-ray diffraction and vibrational spectroscopy, the latter techniques used as complementary instruments to find a correlation between the magnetic behaviour and the structure of the samples. LÄS MER