Sökning: "solenergi"

Visar resultat 36 - 40 av 46 avhandlingar innehållade ordet solenergi.

  1. 36. Electron Donor Systems in Natural and Artificial Photosynthesis

    Författare :Ann Magnuson; Biokemi och Strukturbiologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; solar energy; artificial photosynthesis; Photosystem II; EPR; Biology; Biologi;

    Sammanfattning : Photosynthesis is the process by which light energy is converted into chemical products, in photoautotrophic bacteria, algae and plants. The principal idea is the production of reducing agents by photo-induced oxidation of a sacrificial electron donor. LÄS MER

  3. 37. Epitaxial III-V/Si heterojunctions for photonic devices

    Författare :Giriprasanth Omanakuttan; Sebastian Lourdudoss; Yanting Sun; Harri Lipsanen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; epitaxy; heterojunction; III-V on Si integration; solar cell; Fysik; Physics;

    Sammanfattning : Monolithic integration of III-V materials on silicon is of great interest for efficient electronic-photonic integrated devices and multijunction solar cells on silicon. However, defect formation in the heteroepitaxial layers due to lattice mismatch, thermal mismatch, and polarity mismatch makes it a great challenge. LÄS MER

  4. 38. Combined Energy Solutions Applied to Dairy Farming in Bolivia and Latin America

    Författare :Johnny Villarroel-Schneider; Andrew R. Martin; Anders Malmquist; Valentina Zaccaria; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polygeneration; productive sector; dairy farm; farming; biogas; energy efficiency; electricity; refrigeration; self-sufficiency; techno-economic; GHG emissions; Bolivia; Latin America; Polygeneration; produktiv sektor; mjölkgård; jordbruk; biogas; energieffektivitet; elektricitet; kylning; självförsörjning; teknisk-ekonomisk; växthusgasutsläpp; Bolivia; Latinamerika; Poligeneración; sector productivo; granja; ganadería; biogás; eficiencia energética; electricidad; refrigeración; autosuficiencia; tecno-económico; GEI; Bolivia; América Latina; Energiteknik; Energy Technology;

    Sammanfattning : The transition towards a sustainable world requires immediate action on the part of individuals and communities. Developing countries find the task of incorporating climate change policies difficult for various reasons including the negative effects that the Covid-19 pandemic left behind on the economy. LÄS MER

  5. 39. Structure and Function of Beta-Mannanases from Glycoside Hydrolase Clan A. A Study of Hemicellulases from Microbes and a Mollusc

    Författare :Lars Anderson; Biokemi och Strukturbiologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Proteiner; enzymologi; enzymology; Proteins; subsite organisation; transglycosylation; enzyme kinetics; beta-mannanase; hemicellulose;

    Sammanfattning : Hemicellulose is the second most abundant group of renewable polysaccharides. Mannans can be found as the major hemicellulose in softwood and as storage polysaccharides in a range of plants. In this work, structural and functional characterisations of family 5 and 26 endo-1,4-b-mannanases (b-mannanases) have been performed. LÄS MER

  7. 40. Atomic Scale Modelling in Photoelectrocatalysis : Towards the Development of Efficient Materials for Solar Fuel Production

    Författare :Giane B. Damas; Carlos Moyses Araujo; Rajeev Ahuja; Clas Persson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Photocatalytic hydrogen production; polymeric materials; donor-acceptor architecture; small molecules; density functional theory; hydrogen binding free energies; exciton binding energies; electrocatalysis; carbon dioxide conversion; formic acid production; Sn-based electrodes; Tin oxides; Ru-complexes; Metal Organic Frameworks; carbon dioxide capture.;

    Sammanfattning : Using sunlight to produce valuable chemicals has been pointed out as an interesting alternative to deal with the well-known environmental problem related to the use of fossil fuels for energy generation. Thus, it is crucial for this field the development of novel photocatalysts that could drive the uphill reactions with high efficiency while presenting low price and toxicity. LÄS MER