Sökning: "Drilling Dynamics"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Drilling Dynamics.

  1. 1. Dynamics of Torsional and Axial Vibrations in Indexable Drills

    Författare :Amir Parsian; Tomas Beno; Mahdi Eynian; Högskolan Väst; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Drilling Dynamics; Chatter Vibrations; Indexable Drills; Simulation; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

    Sammanfattning : Drilling is widely used in manufacturing of products which need holes, for example for fluid channels, screws or pins. Depending on application, workpiece material, cutting parameters and economic considerations, different types of drills are employed. Indexable insert drills are types of drills which facilitate inserts to make holes. LÄS MER

  3. 2. Geophysical studies of the upper crust of the central Swedish Caledonides in relation to the COSC scientific drilling project

    Författare :Peter Hedin; Christopher Juhlin; Alireza Malehmir; Bjarne Almqvist; Charles Hurich; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; reflection seismic; collisional orogeny; Scandinavian Caledonides; COSC; scientific drilling; geophysical logging; gravity; magnetics; Geofysik med inriktning mot fasta jordens fysik; Geophysics with specialization in Solid Earth Physics;

    Sammanfattning : The Collisional Orogeny in the Scandinavian Caledonides (COSC) project aims to provide a deeper understanding of mountain belt dynamics through scientific deep drilling in the central parts of the mountain belt of western Sweden. The main targets include a subduction related allochthon, the basal orogenic detachment and the underlying partially subducted Precambrian basement. LÄS MER

  4. 3. Atomistic modeling of interfaces in WC-Co cemented carbides

    Författare :Martin Petisme; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; analytic bond order potentials; weing; WC-Co; grain boundary sliding; grain boundaries; density functional theory; molecular dynamics; interfaces; cemented carbides;

    Sammanfattning : Grain and phase boundaries are crucial in understanding the properties of real materials. In this thesis, interfaces in WC–Co cemented carbide are modeled atomistically using density functional theory (DFT) and analytic interatomic potentials. LÄS MER

  5. 4. Nitrogen dynamics in crop sequences with winter oilseed rape and winter wheat

    Författare :Lena Engström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : With the aim of improving fertiliser nitrogen (N) strategies and reducing N leaching, seasonal changes in soil N supply in crop sequences with winter wheat after winter oilseed rape were examined through field experiments. Break crop effects on wheat after oilseed rape, compared with after peas and oats, were determined as regards residual N, yield and optimum N rate (Opt-N). LÄS MER

  7. 5. Soil tillage influences on soil mineral nitrogen and nitrate leaching in Swedish arable soils

    Författare :Åsa Myrbeck; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Leaching of nitrogen (N) is an unwanted effect of agriculture practices which contributes to eutrophication of surface waters. This thesis examined how soil tillage practices affect leaching losses of N from arable fields. LÄS MER