Sökning: "Johan Sandström"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden Johan Sandström.

  1. 1. Analysis of rail breaks and insulated joint deterioration

    Författare :Johan Sandström; Chalmers University of Technology; []
    Nyckelord :Rail breaks; Heavy Haul; Insulated joints; Wheel flats; Railway mechanics; Material fatigue;

    Sammanfattning : The thesis deals with fatigue related issues in the field of railway mechanics. In particular rail breaks and deterioration of insulating joints are investigated. The study is largely motivated by plans to increase allowed axle loads in Sweden. LÄS MER

  2. 2. Organizational approaches to greening : technocentrism and beyond

    Författare :Johan Sandström; Umeå universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; organizational greening; organizational approach; technocentrism; ecocentrism; anthropocentrism; reflexivity; postmodernism; environmental management; sustainable development; symbolic agora satisfiers;

    Sammanfattning : How and why do organizations approach greening? How can we conceptualize approaches and how can we encourage reflexive dialogues on them? These are the main questions addressed in this qualitative study on organizational greening. The study sets off by discussing matters of research philosophy, arguing that our trust in science ought to be revised and that a more postmodern and constructionist philosophy might be a way to go. LÄS MER

  3. 3. Wheels, Rails and Insulated Joints - Damage and Failure Probability at High Speed and Axle Load

    Författare :Johan Sandström; Chalmers University of Technology; []
    Nyckelord :rail breaks; probability; railway mechanics; contact mechanics; insulated joints; defects; fatigue;

    Sammanfattning : The thesis deals with some fatigue related problems in railway mechanics related to increased axle loads and speeds. The focus is on defects and discontinuities in the wheel--rail system that affect the risk of fatigue and fracture of railway components such as wheels, rails and insulated joints. LÄS MER

  4. 4. Does firm or household borrowing react to monetary policy shocks

    Författare :Maria Sandström; Nils Gottfries; Johan Lyhagen; Knut Are Aastveit; Uppsala universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Nationalekonomi;

    Sammanfattning : .... LÄS MER

  5. 5. The fracture mechanisms in duplex stainless steels at sub-zero temperatures

    Författare :Johan Pilhagen; Pavel Korzhavy; Rolf Sandström; Kim Wallin; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Duplex stainless steel; Weldments; Delamination; Fracture toughness; Impact toughness; Cleavage fracture; Nickel;

    Sammanfattning : The aim of the thesis was to study the susceptibility for brittle failures and the fracture process of duplex stainless steels at sub-zero temperatures (°C). In the first part of the thesis plates of hot-rolled duplex stainless steel with various thicknesses were used to study the influence of delamination (also known as splits) on the fracture toughness. LÄS MER