Sökning: "artificial exposure"

Visar resultat 21 - 25 av 70 avhandlingar innehållade orden artificial exposure.

  1. 21. Ageing and Conservation of Silk. Evaluation of Three Support Methods Using Artificially Aged Silk

    Författare :Johanna Nilsson; Göteborgs universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Artificial ageing of silk; textile conservation; historic silk costumes; stitching techniques; aesthetics;

    Sammanfattning : The general aim of this thesis is to evaluate common remedial conservation support methods used in the conservation treatments of fragile silk costumes that have experienced physical damage. It is based on five papers. LÄS MER

  3. 22. Optimization of paediatric CT examinations - An approach to minimize absorbed dose to patients with regard to image quality and observer variability

    Författare :Kerstin Ledenius; Göteborgs universitet; []
    Nyckelord :Computed Tomography; Paediatrics; Radiation Dosage; Computer Simulations; Nonparametric Statistics; Observer Variation; Radiographic Image Enhancement;

    Sammanfattning : The absorbed dose to paediatric patients is important bearing in mind the increased risk of radiation-induced cancer due to exposure to X-rays at young ages. Questions have also been raised of whether a CT examination of the paediatric brain might lead to a reduction in cognitive function. LÄS MER

  4. 23. Development of methods for evaluation and optimization of chest tomosynthesis

    Författare :Angelica Svalkvist; Göteborgs universitet; []
    Nyckelord :Chest tomosynthesis; Evaluation; Optimization; Simulation; Image Quality; Dosimetry; Dose reduction; Nodule simulation; Validation;

    Sammanfattning : Tomosynthesis is a low-dose technique that has attracted increasing interest from the medical imaging community during the past decade. Tomosynthesis refers to the technique of acquiring a number of projection radiographs using extremely low exposure over a limited angular range, and using these radiographs to reconstruct slices of the imaged object. LÄS MER

  5. 24. Toxicity of metal containing micro- and nanoparticles : studies from an inhalation perspective

    Författare :Johanna Kain; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Particles in urban environments have for a long time been associated with different health problems and diseases, such as worsening of asthma and chronic obstructive pulmonary disease as well as cancer and cardiovascular diseases. In addition, metal containing particles present in occupational settings and industries, particularly particles produced during welding, have been linked to several adverse health effects. LÄS MER

  7. 25. Ecotoxicological assessment by microcosm tests on plankton communities

    Författare :Pardis Pirzadeh; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; limnologi; Marinbiologi; aquatic ecology; limnology; Ecology; Ekologi; Hydrobiology; marine biology; musk substances; brominated flame retardants; structural effects; akvatisk ekologi; Environmental chemistry; Miljökemi; mesocosm;

    Sammanfattning : The aim of this thesis is to present a short-term plankton community toxicity test in laboratory microcosms, with which the effect of the test substance on species abundance and composition of the community is evaluated. This laboratory microcosm is an intermediate between single-species tests and outdoor mesocosm tests. LÄS MER