Search for dissertations about: "tracers"

Showing result 1 - 5 of 124 swedish dissertations containing the word tracers.

  1. 1. Calibration and quality assessment of DESCARTES grabsampler for stratospheric tracers

    Author : Johan Arvelius; Umeå universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Adsorption; Balloon; Carboxen; CFC; Chloro-Fluoro Carbon; Grab sampling; Halocarbon; Molecular sieve; Stratospheric tracer; Tracer; Adsorption; Ballong; Carboxen; CFC; Halogeniserade kolväten; Klor-Flourkarbon; Spårgas; Stratosfärisk spårgas; NATURAL SCIENCES Physics Geocosmophysics and plasma physics Space physics; NATURVETENSKAP Fysik Geokosmofysik och plasmafysik Rymdfysik;

    Abstract : DESCARTES is a light-weight, balloon-borne grab sampler for stratospheric long-lived tracers developed at the University of Cambridge. 33 flights have been performed with two versions of the instrument at northern latitudes by the DESCARTES team at the Swedish Institute of Space Physics (IRF) in Kiruna during the years 1997-2000. READ MORE

  2. 2. Analysis of tracer molecules from organic aerosols - Application of liquid phase microextraction to aerosol analysis

    University dissertation from Department of Chemistry, Lund University

    Author : Murtaza Hyder; Lunds universitet.; Lund University.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Liquid membrane extraction; Secondary organic aerosols; Enrichment; Tracers; Hollow fiber liquid phase microextraction; Biomass burning; Organic carbon;

    Abstract : Popular Abstract in English Airborne particulate matter is well known because of its adverse impacts on human health and its role in climate processes. In order to understand completely the role of aerosols in atmosphere, their chemical composition is of basic importance. READ MORE

  3. 3. Imaging of Enzymes in the Steroid Biosynthetic Pathway Synthesis of 18F-Labelled Tracers

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Maria Erlandsson; Uppsala universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Chemistry Organic chemistry; NATURVETENSKAP Kemi Organisk kemi; Organisk kemi; Organic Chemistry;

    Abstract : This thesis deals with the synthesis and development of 18F-labelled alkyl etomidate and vorozole analogues, and their use as positron emission tomography (PET) tracers for the imaging of the steroid enzymes 11β-hydroxylase and aromatase. Two synthetic 18F-labelling approaches to the etomidate and vorozole analogues were developed, and the analogues were evaluated in some biological assays. READ MORE

  4. 4. Physiological integration and morphological plasticity in extensive clonal plants

    University dissertation from Plant Ecology, Ecology Building, SE-223 62 Lund

    Author : Tina D'Hertefeldt; Lunds universitet.; Lund University.; [2000]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Plant ecology; Maianthemum; Carex; Clonal plants; tracers; Växtekologi;

    Abstract : Popular Abstract in Swedish Fysiologisk integrering och morfologisk plasiticitet i stora klonala växter Många av våra vanligaste växter är klonala, dvs de kan producera avkommor utan sexuell befruktning. Hit räknas blåbär och lingon, många av våra vårväxter som tex. vitsippa och flera av våra värsta ogräs, som kvickrot och kirskål. READ MORE

  5. 5. Iodine Isotopes (129I and 127I) in the Baltic Sea   Tracer applications & environmental impact

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Peng Yi; Uppsala universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; radioactive 129I; stable 127I; AMS; iodine species; nuclear reprocessing facilities; tracers; Baltic Sea; circulation; water exchange; environmental impact;

    Abstract : 129I is a radioactive isotope (T1/2= 15.7 million years) produced through natural and anthropogenic pathways, but the anthropogenic production is presently dominating the Earth’s surface environments. READ MORE