Sökning: "Transient phenomenon"

Visar resultat 16 - 20 av 55 avhandlingar innehållade orden Transient phenomenon.

  1. 16. Secondary Nucleation in Amyloid Formation

    Författare :Mattias Törnquist; NanoLund: Centre for Nanoscience; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Alzheimer s disease; amyloid; Ab42; aggregation mechanism; aggregation kinetics; secondary nucleation; Protein misfolding;

    Sammanfattning : Research into Alzheimer's disease is still hampered by a lack of fundamental understanding of the underlying mechanisms. While the aggregation of the amyloid β peptide (Aβ) into amyloid fibrils is highly implicated as a key factor in the disease, the molecular nature of its involvement has proven complex and elusive. LÄS MER

  3. 17. Development of Helmholtz motion and related wave patterns in the bowed string

    Författare :Knut Guettler; KTH; []
    Nyckelord :;

    Sammanfattning : Of the many wave patterns that the bowed string is capableof producing, the so-called‘Helmholtz motion’(Helmholtz 1862) gives the fullest sound in terms of power andovertone richness. Papers one and two of this thesis deal withthe creation of this particular string movement: The firstpaper, based on computer analysis, describes some systemparameters’influence on the transient in terms of‘playability’. LÄS MER

  4. 18. Intestinal effects of lung recruitment maneuvers

    Författare :Jonas Claesson; Ola Winsö; Stefan Lehtipalo; Conny Arnerlöv; Björn Biber; Göran Hedenstierna; Petter Aadahl; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; acute lung injury; oleic acid lung injury; ischemia; reperfusion injury; swine; mechanical ventilation; lung recruitment; splanchnic circulation; laser Doppler flowmetry; tissue oxygen tension; microdialysis; lactate; glycerol; Anaesthetics and intensive care; Anestesiologi och intensivvård; lungmedicin; Lung Medicine;

    Sammanfattning : Background and aims: Lung recruitment maneuvers (brief episodes of high airway pressure) are a modern treatment alternative to achieve open lung conditions under mechanical ventilation of patients with acute lung injury. It is well known that positive pressure ventilation with high airway pressures cause negative circulatory effects, and that the effects on regional vascular beds can be even more pronounced than the systemic effects. LÄS MER

  5. 19. Exploring Organic Dyes for Grätzel Cells Using Time-Resolved Spectroscopy

    Författare :Ahmed M. El-Zohry; Burkhard Zietz; Ana Morandeira; Leif Hammarström; Eric Vauthey; Uppsala universitet; []
    Nyckelord :Laser spectroscopy; DSSCs; DSC; Electron dynamics; Deactivation processes; Isomerization; Twisting; TICT; Quenching by protons; Semiconductor; Electrolyte; Electron injection; Regeneration; Recombination; Chemistry with specialization in Physical Chemistry; Kemi med inriktning mot fysikalisk kemi; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

    Sammanfattning : Grätzel cells or Dye-Sensitized Solar Cells (DSSCs) are considered one of the most promising methods to convert the sun's energy into electricity due to their low cost and simple technology of production. The Grätzel cell is based on a photosensitizer adsorbed on a low band gap semiconductor. LÄS MER

  7. 20. Vascular receptor changes in ischemic stroke

    Författare :Emelie Stenman; Lund Medicin; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Vascular receptor changes; Ischemic stroke; Endothelin; Angiotensin; Cardiovascular system; Kardiovaskulära systemet; Pharmacological sciences; pharmacognosy; pharmacy; farmakognosi; farmaci; toxikologi; toxicology; Farmakologi;

    Sammanfattning : The present thesis aimed to examine how ischemic stroke affects the vascular endothelin and angiotensin systems in cerebral arteries. To study vascular receptor changes in ischemic stroke transient focal ischemia was induced in rats. LÄS MER