Sökning: "air contamination"

Visar resultat 21 - 25 av 58 avhandlingar innehållade orden air contamination.

  1. 21. A new generation of hospital operating room ventilation

    Författare :Parastoo Sadeghian; Sasan Sadrizadeh; Catherine Noakes; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ventilation systems; bacteria-carrying particles; airflow behaviour; operating room; computational fluid dynamics; surgical site infection; Ventilationssystem; bakteriebärande partiklar; luftflödesbeteende; operationsrum; numerisk strömningsmekanik; kirurgirelaterad infektion; Strömnings- och klimatteori; Fluid and Climate Theory;

    Sammanfattning : Surgical site infection is responsible for 38 percent of reported infections after surgery. This infection increases mortality and treatment costs, and prolongs the hospitalization of patients. LÄS MER

  3. 22. Solar Assisted Pervaporation : A process for the concentration of fruit juices in membrane pouches with solar energy

    Författare :Randi Phinney; Avdelningen för livsmedel och läkemedel; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; pervaporation; solar drying; membrane pouch; juice concentration; fruit preservation; marmalade; tangerine; Vangueria infausta; microbiology; water activity; soluble solids; Brix;

    Sammanfattning : Drying has been used for thousands of years to preserve foods. One of the first methods used was open air sun drying which exposes foods directly to solar radiation and ambient air. This method is still used today around the world but it remains underdeveloped on a small-scale for two main reasons. LÄS MER

  4. 23. On the performance of stratified ventilation

    Författare :Ulf Larsson; Bahram Moshfegh; Per Heiselberg; Högskolan i Gävle; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållbar stadsutveckling; Sustainable Urban Development;

    Sammanfattning : People nowadays spend most of their time indoors, for example in their homes, cars, in trains, at work, etc. In Sweden, the energy demand in the built environment is a growing issue. LÄS MER

  5. 24. Bacteriological Hygiene in the Production of Pasteurised Milk

    Författare :Åsa Eneroth; Livsmedelsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Food and drink technology; RAPD; Bacillus cereus; Pseudomonas; Gram-negative; recontamination source; spoilage flora; phychrotrophs; recontamination; dairy hygiene; pasteurised milk; Livsmedelsteknik;

    Sammanfattning : Critical contamination sites and sources for the Gram-negative psychrotrophs (GNP) of the taxa Pseudomonas, Enterobacteriaceae and Aeromonas, and the Gram-positive spore-forming (GPS) species Bacillus cereus, have been traced in the production line of pasteurised milk. Samples of raw and pasteurised milk from different sampling sites along the line were collected. LÄS MER

  7. 25. Multiphase oxide ceramics in the alumina-yttria system

    Författare :Jesper Alkebro; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materialteknik; Engineering Materials;

    Sammanfattning : As a means of creating dispersed multiphase oxide structures, high-energy milling has been used for pre-treating alumina-yttria powder mixtures before pressing and sintering. Processing was performed in a planetary ball mill with steel or alumina milling tools and measured effects of the treatment have served as data for a modeling study. LÄS MER