Sökning: "impact evaluation"

Visar resultat 11 - 15 av 1063 avhandlingar innehållade orden impact evaluation.

  1. 11. Lamb wave evaluation of concrete plates

    Författare :Oskar Tofeldt; Teknisk geologi; []
    Nyckelord :Lamb waves; guided waves; impact-echo; concrete; non-destructive evaluation;

    Sammanfattning : This thesis is about the application of Lamb waves for non-destructive evaluation of plate-like concrete structures under one-sided access test condition using a portable equipment consisting of an accelerometer and impact hammer. With this type of equipment and based on array signal processing, the impact-echo (IE) method can be extended with measurements of surface waves; this extension allows an evaluation with Lamb waves. LÄS MER

  3. 12. Essays on Unemployment Duration and Programme Evaluation

    Författare :Anton Nivorozhkin; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Transition economics; evaluation; unemployment duration; active labour market programmes;

    Sammanfattning : The process of labour market transformation in the 1990s attracted a lot of attention from economists and policy makers. Unprecedented changes, like rapid reforms in Central and Eastern Europe and later the expansion of the European Union, require a deeper understanding of current labour-market trends. LÄS MER

  4. 13. Software Development Productivity : Evaluation and Improvement for Large Industrial Projects

    Författare :Piotr Tomaszewski; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; software development productivity; evaluation; improvement;

    Sammanfattning : Software development productivity can be improved by introducing improvements in many areas. In this thesis we investigate technology and process driven productivity improvements, i.e., productivity improvements that have sources in changes of technologies or in changes in development processes. LÄS MER

  5. 14. Early stages of designing resource-efficient offerings : An initial view of their analysis and evaluation

    Författare :Sergio Brambila-Macias; Tomohiko Sakao; Anne-Marie Tillman; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Design; analysis; evaluation; ecodesign; product service systems; resource-efficient offerings; circular economy; interdisciplinary research; transdisciplinary research;

    Sammanfattning : The increasing use of natural resources and the pollution it causes calls for new ways of addressing customer needs. Additionally, a more uncertain and complex world also presents new challenges. LÄS MER

  7. 15. Damage Tolerance of Impacted Composite Sandwich Structures

    Författare :Moeen ud din Saeed Rajput; Malin Åkermo; Stefan Hallström; Magnus Burman; Christian Berggreen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; composite sandwich; cellular; polymer; material characterization; modulus; non-crimp fabric; low velocity impact; vibration; uncertainty analysis; drop-weight impact; fractography; barely visible impact damage; X-ray microtomography; compression-after-impact; bending-after-impact; high speed image processing; damage resistance; damage tolerance; Aerospace Engineering; Flyg- och rymdteknik;

    Sammanfattning : This thesis deals with damage tolerance of impacted sandwich structures for load bearing applications. Composite sandwich structures find wide application as lightweight solutions in aerospace components, since weight reduction and less fuel emissions are primary concerns for aircraft manufactures. LÄS MER