Sökning: "short cracks"

Visar resultat 21 - 25 av 26 uppsatser innehållade orden short cracks.

  1. 21. Göta älvbron, övervakning med optisk fiber : Ekonomisk analys

    Uppsats för yrkesexamina på grundnivå, Institutionen för teknikvetenskaper

    Författare :Annika Herlin; [2011]
    Nyckelord :Göta älvbron övervakningssystem optisk fiber;

    Sammanfattning : The Göta älv-bridge is a welded steel bridge which is located in Gothenburg, it connects the inner city of Gothenburg with the island Hisingen. Cracks was discovered in the steel in 1999-2000 which started an investigation of the bridge to clearify the condition of the bridge. LÄS MER

  3. 22. Growth of cracks at rolling contact fatigue

    Uppsats för yrkesexamina på avancerad nivå, KTH/Hållfasthetslära (Avd.)

    Författare :Dave Hannes; [2008]
    Nyckelord :rolling contact fatigue; short cracks; crack path determination; crack growth rate; sensitivity study.;

    Sammanfattning : Rolling contact fatigue is a problem encountered with many machine elements.In the current report a numerical study has been performed in order to predictthe crack path and crack propagation cycles of a surface initiated rolling contactfatigue crack. LÄS MER

  4. 23. Extraction and Application of Secondary Crease Information in Fingerprint Recognition Systems

    Uppsats för yrkesexamina på grundnivå, Institutionen för teknik och naturvetenskap

    Författare :Pontus Hymér; [2005]
    Nyckelord :Datorteknik; biometrics; fingerprint analysis; feature extraction; secondary creases; template aging; Gabor filter; pattern recognition; Hough transform; vector clustering; Datorteknik;

    Sammanfattning : This thesis states that cracks and scars, referred to as Secondary Creases, in fingerprint images can be used as means for aiding and complementing fingerprint recognition, especially in cases where there is not enough clear data to use traditional methods such as minutiae based or correlation techniques. A Gabor filter bank is used to extract areas with linear patterns, where after the Hough Transform is used to identify secondary creases in a r, theta space. LÄS MER

  5. 24. Modellering av extrema istryck.

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Avdelningen för Konstruktionsteknik

    Författare :Magnus Fredrikson; Johan Persson; [2005]
    Nyckelord :Technology and Engineering;

    Sammanfattning : Today, the knowledge about ice forces in Sweden is uncertain. Certain guidelines have been developed according to RIDAS to determine ice forces when constructing dams, piers etc. In this thesis an environmental model has been developed to predict thermal ice pressures. LÄS MER

  7. 25. Odlingens och lagringens inverkan på utsädes grobarhet

    L3-uppsats, SLU/Dept. of Crop Science

    Författare :Carl-Henrik Stenson; [2004]
    Nyckelord :lagring; grödor;

    Sammanfattning : At seed-growing the aim is to produce a commodity with high germination capacity, good soundness and purity, and also slight admixture of seeds from other species. The capacity of germination and the vigour of the seeds may become impaired in consequence of mechanical damage, infection of diseases, growth of mould, attacks of vermin, high drying temperature, secret germination, sprouting in the ears etc. LÄS MER