Sökning: "air humidity"

Visar resultat 16 - 20 av 144 avhandlingar innehållade orden air humidity.

  1. 16. Solid-phase Microextraction and Detection of Organophosphate Triesters in Indoor air

    Författare :Sindra Isetun; Ulrika Nilsson; Anna-Karin Borg-Karlsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SPME; Organophosphate triesters; flame-retardant; indoor air; Analytical chemistry; Analytisk kemi;

    Sammanfattning : In the work underlying this thesis solid-phase microextraction (SPME) was evaluated as a passive sampling technique for organophosphate triesters in indoor air. These compounds are used on a large scale as flame-retarding and plastizicing additives in a variety of materials and products, and have proven to be common pollutants in indoor air. LÄS MER

  3. 17. Oxidation of terpenes in indoor environments : A study of influencing factors

    Författare :Linda Pommer; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Environmental chemistry; Monoterpene; Ozone O3 ; Nitrogen dioxide NO2 ; Nitrogen oxide NO ; Relative humidity RH ; Modelling; Scrubber; Experimental design; Interaction; Volatile organic compounds VOC ; Sick buildings syndrome SBS ; Principal component analysis PCA ; Indoor air; Ventilation; Tenax TA; Sodium sulphite; Miljökemi; Environmental chemistry; Miljökemi; analytisk kemi; Analytical Chemistry;

    Sammanfattning : In this thesis the oxidation of monoterpenes by O3 and NO2 and factors that influenced the oxidation were studied. In the environment both ozone (O3) and nitrogen dioxide (NO2) are present as oxidising gases, which causes sampling artefacts when using Tenax TA as an adsorbent to sample organic compounds in the air. LÄS MER

  4. 18. Physics of Electrical Discharge Transitions in Air

    Författare :Lipeng Liu; Marley Becerra; Ute Ebert; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrical discharges; transition; streamers; glow corona; leader discharges; elektriska urladdningar; övergång; streamers; glöd-korona; ledarurladdningar; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Electrical discharges with a variety of different forms (streamers, glow corona, leaders, etc.) broadly exist in nature and in industrial applications. Under certain conditions, one electrical discharge can be transformed into another form. LÄS MER

  5. 19. Urban Climate and Air Pollution in Ouagadougou, Burkina Faso

    Författare :Jenny Lindén; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sub-Saharan Africa; Sahel; semi arid; nocturnal cooling; urban vegetation; evening evaporative cooling; cooling rate; atmospheric stability; thermal wind; carbon monoxide; particulate matter; road dust; exposure differences;

    Sammanfattning : ABSTRACT Africa has recently been singled out by UN Habitat as the fastest urbanizing continent in the world. The most extreme case was found in the Sahelian city of Ouagadougou, Burkina Faso, where the population is expected to almost double over the next ten years. LÄS MER

  7. 20. Single Fibre Collection Efficiency : Infångningseffektiviteten för ett fiber

    Författare :Orest Lastow; Ergonomi och aerosolteknologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; air filtration; collection efficiency; aerosol technology; numerical modelling; fibrous filter; fiberfilter; aerosolteknik; luftrening;

    Sammanfattning : A personal computer program, FiFi, that makes a real-time two-dimensional simulation of the dynamic deposition process of particles on one or two fibres, has been developed. The code has been used to numerically calculate the collection efficiencies of spherical particles on a clean single fibre. LÄS MER