Sökning: "Ann Bäckström"

Hittade 3 avhandlingar innehållade orden Ann Bäckström.

  1. 1. Investigation of the correlation of fracture frequency and electric resistivity in impact craters in crystalline rocks

    Författare :Ann Bäckström; KTH; []
    Nyckelord :Electric resistivity; Fracture frequency; Impact generated fractures; Electro-magnetic techniques; VLF-R method; MT method; Window-mapping technique; Three-dimensional fracture calculations; heat-exchange structure; geothermal energy;

    Sammanfattning : Impact craters are formed when a large meteorite or comethits the Earth. At the impact a shock wave is released causingabundant fracturing in the surrounding bedrock. This type offracturing is intense and occurs throughout a very large volume(>100 km3) of the bedrock. LÄS MER

  3. 2. Rock damage caused by underground excavation and meteorite impacts

    Författare :Ann Bäckström; Robert Zimmerman; John A Hudson; Flavio Lanaro; Pekka Särkkä; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Excavation Damage Zone EDZ ; Fracture analysis; Pre-existing fractures; Class II behaviour; 3D laser scanning; Impact fracturing; Geoengineering; Geoteknik;

    Sammanfattning : The intent of this thesis is to contribute to the understanding of the origin of fractures in rock. The man-made fracturing from engineering activities in crystalline rock as well as the fracturing induced by the natural process of meteorite impacts is studied by means of various characterization methods. LÄS MER

  4. 3. "Ja bare skrivar som e låter" : En studie av en grupp Närpesungdomars skriftpraktiker på dialekt med fokus på sms

    Författare :Anna Greggas Bäckström; Lars-Erik Edlund; Ann-Catrine Edlund; Jan-Ola Östman; Umeå universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; literacy; literacy practices; SMS Short Message Service ; dialect; young people; identity; Modern Swedish; Scandinavian Languages; nordiska språk;

    Sammanfattning : The thesis studies the literacy practices of a group of young people in Närpes in southern Ostrobothnia, Finland with focus on SMS (Short Message Service), both in Standard Swedish and in dialect, but for the most part written in dialect. The aim of the investigation is to describe this writing as a social marker (young people against adults) and its function as an identity act. LÄS MER