Sökning: "Luleå tekniska universitet."

Visar resultat 41 - 45 av 3527 avhandlingar innehållade orden Luleå tekniska universitet..

  1. 41. Optimization, scale up and simulation of tumbling mills

    Författare :Ming-Wei Gao; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mineralteknik; Mineral Processing;

    Sammanfattning : Grinding is a fundamental process in the mineral industries. Grinding mills are often very large machines. Their efficiency and energy consumption therefore are of major importance. Problems of large ball mills are discussed in this thesis. LÄS MER

  3. 42. Bi-based high Tc superconductors and enhancement of critical current density

    Författare :Shi-ju Guo; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material Mechanics; Materialmekanik;

    Sammanfattning : Basic bulk high temperature superconductors in the Bi-Sr-Ca-Cu-O system and the BiPb-Sr-Ca-Cu-O system were prepared through the solid state reaction route and the coprecipitation method. The formation of 110 K phase promoted by partial Pb substitution for Bi was studied. Effects of heat treatment on 110K phase formation were studied. LÄS MER

  4. 43. Impact and optimum transmission of waves : some theoretical and experimental studies

    Författare :Ram Gupta; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : .... LÄS MER

  5. 44. Propagation of weak shock waves in an elliptical cavity

    Författare :Göran Gustafsson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Sammanfattning : The propagation of weak shock waves in a planar elliptical cavity is studied theoretically and experimentally. The results are of interest in the design of an elliptical high-speed water jet generator operating in a transient fashion with electrically generated shocks in the acoustic regime. LÄS MER

  7. 45. Fracture mechanics models for fatigue in concrete structures

    Författare :Kent Gylltoft; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Structural Engineering; Konstruktionsteknik;

    Sammanfattning : This thesis deals with the application of fracture mechanics to model monotonic and cyclic loading of reinforced concrete structures. The main features of the work are: - Constitutive modelling based on fracture mechanics - Numerical studies of the models in various applications - Experimental studies to check the models and to determine material parameters The fracture mechanics models are formulated on a constitutive level. LÄS MER