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  • 1.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Carlsson, Peter
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Cross-country ski vibrations and possible mechanisms of their influence on the free gliding2012In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 34, p. 473-478Article in journal (Refereed)
    Abstract [en]

    Present paper describes the results of experimental studies on the self-induced and forced vibrations of loaded cross country skis and presents the discussion on the possible mechanisms causing such vibrations and the ways they can influence the friction between the ski running surface and the snow. Studied vibrations of gliding skis are most probably caused by the frictional effects. Mechanisms involved are similar to the ones causing the brake disc squeal or the violin string excitation by the bow. Major factors responsible for the development of these vibrations such as micro roughness of the surfaces, nonlinearities in the material properties, thermo-elastic instabilities and instabilities due to decreasing friction with increasing sliding velocity are also common for the case of gliding skis. The results of this study indicate that the ski vibration pattern both in amplitude and in frequency could influence the ski gliding properties. Though it seems quite feasible that the control of the cross country ski vibrations can improve the gliding performance, further systematic studies are needed to confirm it and to formulate the consecutive strategies of cross country ski design improvement.

  • 2.
    Sparf, Jörgen
    et al.
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    Petridou, Evangelia
    Mid Sweden University, Faculty of Human Sciences, Department of Social Sciences.
    Collaborations in Routine Emergency Management: Lessons from Sweden2018In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 212, p. 302-308Article in journal (Refereed)
    Abstract [en]

    Effective collaborations in emergency management is the Holy Grail for practitioners in Sweden and elsewhere. More than mere coordination, interorganizational collaboration is deemed by many as the most optimal arrangement to share resources and respond to emergencies more quickly and efficiently. It is also considered to be the source of a broadly and rather vaguely defined concept of greater good. Such collaborations tend to be uncritically accepted as innovative, especially in instances of large-scale disasters or planned events while routine emergency management arrangements tend to be under researched. This research is an in-depth case study of an interorganizational collaboration in the greater Stockholm region in Sweden concerning routine emergency management. The collaboration comprises the physical relocation of one operator each from seven organizations in the area and the establishment of the “Collaboration Cluster”. Rather than attempt to define the concept of “greater good” we set out to evaluate the quality of collaboration from the perspective of each member organization. We build a multi-dimensional model to assess the expectations of each organization at the political, managerial, and operative level. What is more, we view the Collaboration Cluster as a network at the operative level and for this reason we employ formal Social Network Analysis (SNA) to tease out network variables that have an effect on the quality of collaboration.

  • 3.
    Troynikov, Olga
    et al.
    RMIT University, School of Fashion and Textiles, Melbourne, Australia.
    Wardiningsih, Wiah
    RMIT University, School of Fashion and Textiles, Melbourne, Australia.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Watson, Chris
    RMIT University, School of Fashion and Textiles, Melbourne, Australia.
    Oggiano, Luca
    The Norwegian University of Science and Technology, Trondheim, Norway.
    Influence of Material Properties and Garment Composition on Pressure Generated by Sport Compression Garments2013In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 60, p. 157-162Article in journal (Refereed)
    Abstract [en]

    Sports compression garments (SCG) have been used by athletes for years as means of enhancement of theirperformance and speed of recovery. In this research, the investigation into the effects the physical attributes ofsuitable materials and their composition and orientation in SCG have upon the amount and distribution of pressuregenerated to the underlying body was undertaken. Two different knitted fabrics suitable for compression sportgarment with different physical properties and elastic performance attributes were chosen. Experimental fabricsleeves were assembled, so that they provided different fabric strains around the circumference of the differentdiameter of cylinders they were placed on. The pressure generated by sleeves was measured using Salzmannpressure-measuring device MST MK IV and Salzmann MST 2007 software. It was determined that different materialcomposition of fabric assemblies influenced the pressure delivery of garment. However no clear relationship betweenthe fabric percentage in assembly composition and the generated pressure was established.

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