Sökning: "tear film"

Visar resultat 6 - 10 av 10 avhandlingar innehållade orden tear film.

  1. 6. Corneal cellular proliferation and wound healing

    Författare :Lisha Gan; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :cornea; cell proliferation; wound healing; stem-cells; leukocytes; PCNA; hyaluronan; alkali injury; photorefractive keratectomy;

    Sammanfattning : Background: Cellular proliferation plays an important role in both physiological and pathological processes. Epithelial hyperplasia in the epithelium, excessive scar formation in retrocorneal membrane formation and neovascularization are examples of excessive proliferation of cornea cells. Lack of proliferative ability causes corneal degeneration. LÄS MER

  3. 7. Journal bearing design, lubrication and operation for enhanced performance

    Författare :Gregory F Simmons; Rob Dwyer-Joyce; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinelement; Machine Elements;

    Sammanfattning : The increasing introduction of intermittent power sources combined with the de-regulation of electricity markets has led to increased instability in the electrical grid. This has led to increased start-up and shutdown of regulating power sources such as hydro-electric power plants and operation at non-ideal operating states both of which increase the wear and tear on machines. LÄS MER

  4. 8. Electrically conductive textile coatings with PEDOT:PSS

    Författare :Maria Åkerfeldt; Anne Schwarz; Högskolan i Borås; []
    Nyckelord :textile coating; conductive coating; conjugated polymers; ICP; PEDOT:PSS; textile properties; textile sensor; printed electronics; Smart textiles; poly 3; 4-ethylene dioxythiophene -poly styrene sulfonate ; Textiles and Fashion General ; Textil och mode generell ;

    Sammanfattning : In smart textiles, electrical conductivity is often required for several functions, especially contacting (electroding) and interconnecting. This thesis explores electrically conductive textile surfaces made by combining conventional textile coating methods with the intrinsically conductive polymer complex poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS). LÄS MER

  5. 9. Analysis, metabolism, effects and biological monitoring of N-methyl-2-pyrrolidone

    Författare :Martin Carnerup; Avdelningen för arbets- och miljömedicin; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Yrkesmedicin; arbetsmiljömedicin; industrial medicine; Occupational health; developmental toxicity; biomarkers; metabolsim; N-methyl-2-pyrrolidone; dermal absorption;

    Sammanfattning : N-methyl-2-pyrrolidone (NMP) is an organic solvent widely used in the industry. Irritation of the eyes and in the respiratory system has been reported after occupational exposure to low air levels of NMP. The EU has also classified it as a developmental toxicant. NMP is easily absorbed in the gastrointestinal tract and airways and through skin. LÄS MER

  7. 10. Processing and properties of nanocomposites based on polylactic acid, chitin and cellulose

    Författare :Natalia Herrera Vargas; Kristiina Oksman; Aji P. Mathew; Jyrki Vuorinen; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nanocomposite; Cellulose; Chitin; Extrusion; Polylactic acid; Trä och bionanokompositer; Wood and Bionanocomposites;

    Sammanfattning : The production of bio-based and biodegradable nanocomposites has gained attention during recent years for environmental reasons; however, the large-scale production of these nanocomposites still poses challenges. The objective of this work has been to prepare bio-based and biodegradable nanocomposites via liquid-assisted extrusion and to gain a deeper understanding of the process and the relationship between the process, composition, structure and properties. LÄS MER