Sökning: "dynamic loading"

Visar resultat 16 - 20 av 211 avhandlingar innehållade orden dynamic loading.

  1. 16. Concrete Structures Subjected to Fragment Impacts

    Författare :Joosef Leppänen; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; perforation; penetration; strain rate; scabbing; dynamic loading; fragment and projectile impacts; numerical simulations; spalling; concrete; blast wave;

    Sammanfattning : As concrete is commonly used for protective structures, how a blast wave and fragment impacts from an explosion affect the concrete is an important issue. Concrete subjected to explosive loading responds very differently from statically loaded structures. LÄS MER

  3. 17. Long-term set-up of driven piles in sand

    Författare :Gary Axelsson; KTH; []
    Nyckelord :driven piles; shaft capacity; instrumentation; sand; set-up; torque; loading tests; soil ageing; time effects; driven rods; dynamic probing;

    Sammanfattning : .... LÄS MER

  4. 18. Ultrastructural Aspects of Pulp Fibers as Studied by Dynamic FT-IR Spectroscopy

    Författare :Margaretha Åkerholm; KTH; []
    Nyckelord :cellulose; cooperation; crystallinity; dynamic test; glucomannan; hardwood; holocellulose; humidity; infrared spectroscopy; kraft pulp; lignin; mechanical pulp; orientation; polarised light; softwood; strain; sulphite pulp; viscoelasticity; xylan;

    Sammanfattning : Dynamic (or 2D) FT-IR spectroscopy in combination withpolarized IR irradiation has been used in this work to studywood polymer orientation and interactions on theultrastructural level in wood fibers in the native state aswell as the effects of different pulping processes. The woodpolymer interactions were studied under both dry and humidconditions. LÄS MER

  5. 19. Dynamic behaviour under wind loading of a 90 m steel chimney

    Författare :Pär Tranvik; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  7. 20. Synthetic Transformations via Metal- and Enzyme-Catalyzed Dynamic Kinetic Resolution

    Författare :Krisztián Bogár; Jan-Erling Bäckvall; Romas Kazlauskas; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ruthenium; racemization; lipase; dynamic kinetic resolution; secondary alcohol; Candida antarctica lipase B; Organic chemistry; Organisk kemi; Organic Chemistry; organisk kemi;

    Sammanfattning : This thesis deals with the preparation of a new half-sandwich type ruthenium(II)- catalyst for racemization of optically active secondary alcohols and the development of a highly efficient method in combination with lipases such as Candida antarctica lipase B and Pseudomonas cepacia lipase for dynamic kinetic resolution of various functionalized alcohols under mild reaction conditions.It was shown that the RuCl(CO)2(η5-C5Ph5) complex can racemize optically active aliphatic and aromatic secondary alcohols at room temperature in rather short times. LÄS MER