Sökning: "Impact test"

Visar resultat 6 - 10 av 1062 avhandlingar innehållade orden Impact test.

  1. 6. 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

  3. 7. Assessing mathematical creativity : comparing national and teacher-made tests, explaining differences and examining impact

    Författare :Jesper Boesen; Johan Lithner; Torulf Palm; Gunnar Gjone; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Mathematical reasoning; creative reasoning; moderate high stake; teacher made tests; imitative reasoning; assessment; impact; influence; effect; mathematical competence; national tests; MATHEMATICS; MATEMATIK; Mathematical reasoning; creative reasoning; moderate high stake; teacher made tests; imitative reasoning; assessment; impact; influence; effect; mathematical competence; national tests;

    Sammanfattning : Students’ use of superficial reasoning seems to be a main reason for learning difficulties in mathematics. It is therefore important to investigate the reasons for this use and the components that may affect students’ mathematical reasoning development. LÄS MER

  4. 8. Health promotion and fall prevention for older people : impact, relevance and economic justification for decision making in a municipality context

    Författare :Saranda Bajraktari; Marlene Sandlund; Magnus Zingmark; Erik Rosendahl; Beatrice Pettersson; Erja Portegijs; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Older people; health promotion; primary prevention; falls prevention; digital health; mHealth; healthy ageing; self-management; reach; cost-effectiveness; self-reported health outcomes; knowledge translation; impact; Public health; folkhälsa; Public health; folkhälsa;

    Sammanfattning : Background: The proportion of older people is increasing and calls for a shift towards proactive approaches to support healthy ageing. The evidence base on health-promoting and preventive interventions (HPP) is promising in terms of maintaining health in older people, but for such interventions to have an impact on population health, translation of evidence to practice is crucial. LÄS MER

  5. 9. Initial Studies of Dynamic Responses of Female and Male Volunteers in Rear Impact Tests

    Författare :Anna K Carlsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dynamic response; rear impact; response corridors; volunteers; crash test; neck injury; whiplash; females;

    Sammanfattning : Whiplash Associated Disorder (WAD) - commonly denoted whiplash injury - resulting from vehicle impacts, is a worldwide epidemic. These injuries occur at relatively low changes of velocity (typically between 10-25 km/h) and in impacts from all directions. Rear impacts are however the most common in the accident statistics. LÄS MER

  7. 10. Leave no trace: A non-destructive correlative approach providing new insights into impactites and meteorites

    Författare :Josefin Martell; Berggrundsgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; impact cratering; Mars; Mien impact structure; X-ray tomography; Neutron tomography; Shock metamorphism; Impact structure;

    Sammanfattning : Impact cratering is today recognized as a fundamental geological process on all rocky bodies in the solar system. On Earth, however, processes such as plate tectonics and erosion have eradicated most craters from the geological record, or they may be buried under sediments, oceans, and vegetation. LÄS MER