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  • 1.
    Eriksson, Malin
    Dalarna University, School of Technology and Business Studies, Material Science.
    Kartläggning av härdsprickor vid induktionslinjenpå stålsorterna Ovako 327A och 356D2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The thesis work investigates the steel grades Ovako 327A and Ovako 356D. Thepurpose of the investigation is to examine the origin of the hardening crackscreated during the induction hardening process. In an earlier investigation done bythe company it was shown that carbon segregations can be the cause of theproblem. Two other causes have also been examined within this project. Thesecauses are end cracks from the cold shear process and rolling defects. The methodsof the examination are hardness testing, segregation testing and visual inspectionof the bars. The result shows increased carbon content in the centre of the bars insteel grade Ovako 327A. Steel grade Ovako 356D shows a normal carbon content.The hardness testing on steel grade Ovako 327A shows a higher hardness in thecentre compared to the surface hardness on the samples containing carbonsegregation. Discovered rolling defects have not created hardening cracks in theinduction line. The effects from end cracks could not be investigated sincediscovered end cracks had to be removed because the study was made on customermaterial. The conclusion from this thesis work is that more material from the topof the ingot in steel grade Ovako 327A should be cropped in the primary rollingmill in Hofors to remove carbon segregations. The steel grade Ovako 356D showsno sign of hardening cracks in this study.

  • 2. Ernberg, M
    et al.
    Christidis, N
    Ghafouri, B
    Bileviciute-Ljungar, I
    Löfgren, M
    Bjersing, J
    Palstam, Annie
    Sahlgrenska Academy, University of Gothenburg.
    Larsson, A
    Mannerkorpi, K
    Kosek, E
    Plasma cytokine levels in fibromyalgia and their response to 15 weeks of progressive resistance exercise or relaxation therapy2018In: Mediators of Inflammation, ISSN 0962-9351, E-ISSN 1466-1861, Vol. 2018, article id 3985154Article in journal (Refereed)
    Abstract [en]

    The aims of this study were to compare circulating cytokines between FM and healthy controls and to investigate the effect on cytokine levels by 15 weeks of progressive resistance exercise or relaxation therapy in FM. Baseline plasma cytokine levels and clinical data were analyzed in 125 women with FM and 130 age-matched healthy women. The FM women were then randomized to progressive resistance exercise (n = 49) or relaxation (n = 43). Baseline IL-2, IL-6, TNF-α, IP-10, and eotaxin were higher in FM than in healthy controls (P < 0.041), whereas IL-1β was lower (P < 0.001). There were weak correlations between cytokine levels and clinical variables. After both interventions, IL-1ra had increased (P = 0.004), while IL-1β had increased in the relaxation group (P = 0.002). Changes of IFN-γ, IL-2, IL-4, IL-6, IL-8, and IL-17A were weakly correlated with changes of PPT, but there were no significant correlations between changes of cytokine and changes in other clinical variables. The elevated plasma levels of several cytokines supports the hypothesis that chronic systemic inflammation may underlie the pathophysiology of FM even if the relation to clinical variables was weak. However, 15 weeks of resistance exercise, as performed in this study, did not show any anti-inflammatory effect on neither FM symptoms nor clinical and functional variables. This trial is registered with ClinicalTrials.gov NCT01226784, registered October 21, 2010. The first patient was recruited October 28, 2010.

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