Sökning: "oxygen transfer rate"

Visar resultat 16 - 20 av 61 avhandlingar innehållade orden oxygen transfer rate.

  1. 16. Probing Control of Glucose Feeding in Escherichia coli Cultivations

    Författare :Mats Åkesson; Institutionen för reglerteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Automatiska system; control engineering; robotics; Automation; dissolved oxygen; acetate; glucose feeding; robotteknik; Escherichia coli; Process control; fed-batch cultivation; reglerteknik; Biotechnology; Bioteknik;

    Sammanfattning : Production of many proteins can today be made using genetically modified organisms. One of the most frequently used host organisms is the bacterium Escherichia coli. A difficulty encountered in cultivations of E. coli is the accumulation of the metabolic by-product acetate which inhibits cell growth and production of a desired protein. LÄS MER

  3. 17. Formation of non-metallic inclusions and the possibility of their removal during ingot casting

    Författare :Lars Ragnarsson; Sichen Du; Carlo Mapelli; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ingot casting; tool steel; inclusion; runner; refractory; erosion; casting powder; cold model; argon shroud; reoxidation; oxygen measurement; CFD; PIV; Metallurgical process engineering; Metallurgisk processteknik;

    Sammanfattning : The present study was carried out to investigate the formation and evolution of non-metallic inclusions during ingot casting. Emphasize have been on understanding the types of inclusions formed and developed through the casting process and on the development of already existing inclusions carried over from the ladle during casting. LÄS MER

  4. 18. Engineering inorganic nanostructured composites for boosting H2 and O2 evolution reactions

    Författare :Getachew Solomon; Isabella Concina; Alberto Vomiero; Sixto Gimenez; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hydrogen evolution HER ; Oxygen evolution reaction OER ; Oxygen reduction reaction ORR ; Water splitting; Electrocatalyst; Atomic layer deposition; Core-shell structure; Experimentell fysik; Experimental Physics;

    Sammanfattning : Hydrogen is considered a promising energy source with zero emission of CO2; it can provide higher energy density compared to other sources of energy. The amount at which H2 is produced, and the method of production need further improvement for the advancement of hydrogen energy technologies. LÄS MER

  5. 19. Monitoring Proton Exchange and Triplet States with Fluorescence

    Författare :Tor Sandén; Jerker Widengren; Vogel Horst; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; fluorescence correlation spectroscopy; proton transfer; cytochrome c oxidase; transient state imaging; modulated excitation; Optics; Optik; Biochemistry; Biokemi;

    Sammanfattning : Fluorescent molecules commonly shift to transient dark states, induced bylight or triggered by chemical reactions. The transient dark states can beused as probes of the local environment surrounding the fluorescent molecules,and are therefore attractive for use in biomolecular applications. LÄS MER

  7. 20. Quantum mechanical studies of ionization and electron transfer in diatomic systems : O2 and H+ + H-

    Författare :Michael Stenrup; Hans Ågren; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biochemistry; Biokemi;

    Sammanfattning :   The present thesis is based upon two papers concerning the core-valence double onization of molecular oxygen and mutual neutralization of H+ and H- ions at low collision energies. The former of these processes has been studied for the first time using a magnetic bottle time-of-ight electron coincidence spectrometer in combination with ab initio electronic structure calculations. LÄS MER