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Visar resultat 1 - 5 av 7 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Methods for measurements and analyses of cracks in flexible pavements

    Författare :Petra Offrell; KTH; []
    Nyckelord :Cracking; Crack propagation; Data collection methods; Image analysis; Image processing; LTPP; Automatic identification systems; Flexible pavement; PAVUE; Laser RST; measures; characterisation; x-ray computerised tomography; asphalt; 3D analysis; top-;

    Sammanfattning : When cracking has propagated through the entire asphaltbound layers, water may ingress into the unbound layers andaccelerate the deterioration of the road structure. Knowledgeon where cracks initiate and how they propagate vertically istherefore of great practical importance. LÄS MER

  3. 2. Optimised performance of industrial high resolution computerised tomography

    Författare :Måns Mångård; Joseph N. Gray; Linköpings universitet; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The purpose of non-descructive enluation (NDE) is to acquire knowledge of the investigated sample. Digital x-ray imaging techniques such as radiography or computerised tomography (CI) produce images of the interior of a sample. The obtained image quality determines the possibility of detecting sample, ·elated features, e.g. LÄS MER

  4. 3. Techniques for the determination of the optimal performance of high resolution computerised tomography

    Författare :Peter Hammersberg; Holger Reiter; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Techniques to deternine the optimal performance of high resolution computerised tomography (CT) has been studied, that is, optimal data collection parameter settings for the imaging task at issue and its detectability limits.Generally, CT is an X-ray based non-destructive testing method that was developed for medical purposes in the seventies and introduced for industrial applications the latter half of the eighties. LÄS MER

  5. 4. Characterisation of wood-fibre—based materials using image analysis

    Författare :Erik Wernersson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Wood fibres are the main constituent of paper and are also used to alter properties of plastics in wood-fibre—based composite materials. The manufacturing of these materials involves numerous parameters that determine the quality of the products. LÄS MER

  7. 5. Methods for collecting and analysing simultaneous strain and moisture data during wood drying

    Författare :Jonas Danvind; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träfysik; Wood Physics;

    Sammanfattning : Improved understanding of moisture and mechanical behaviour is an international objective for wood drying research. The main objective of this licentiate thesis work was to develop an experimental method suitable for collecting valuable response data related to the moisture and mechanical behaviour of drying wood. LÄS MER