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  • 14851.
    Olsson, Marielle
    Dalarna University, School of Health and Welfare.
    Sammanbrott igen?: En kvalitativ intervjustudie om socialsekreterares upplevelser av sammanbrott hos familjehem i den sociala barnavården2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The studys purpose was to investigate social workers and foster care consultants' experiences of breakdowns in foster homes. A qualitative approach was used and five semi-structured interviews were conducted. The theory used was Erving Goffman's Dramaturgy and Anders Broberg's interpretation of John Bowlby's attachment theory. Data was analyzed thematically where three different themes emerged. The study shows that social workers and consultants need good cooperation, clear assignment and a familial relationship with foster homes in order for foster homes to be able to continue even when it is difficult. Social workers and foster care consultants need to be responsive, curious and accessible to avoid breakdown. Research shows that breakdowns are often initiated by foster families and are stated to be due to the child's behavior and lack of understanding of the child and its experiences. This is partly consistent with the respondents' experience of the reasons behind breakdowns.

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  • 14852.
    Olsson, Matilda
    et al.
    Dalarna University, School of Education, Health and Social Studies, Sociology.
    Holmström, Paulina
    Dalarna University, School of Education, Health and Social Studies, Sociology.
    “Jag ser varken upp eller ner på överklassen”: En kvalitativ studie om fördomar, klasstillhörighet och klassidentitet2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The empirical basis of the study is three episodes of the series "Bathina's Different Worlds",which want to lift prejudices about class belongings among the people involved in theprogram series. The program leader travels around Sweden and visits different families tointerview them about their class affiliations. The public is asked if they have any prejudicesabout class affiliation. The study deals with the following social classes; the working class,the middle class and the upper class. The purpose of this study is to examine whether thereare prejudices about class affiliation and in such cases which. Furthermore, the aim of thestudy is to examine class identity among the families involved in the program series. Thestudy has a qualitative approach and is analyzed from Erving Goffman's theories using thehermeneutic interpretation theory. The study shows that there are prejudices for all threesocial classes, some prejudices can be confirmed in the program series and others not. Thefamilies of the working class and middle class identify themselves as working class andmiddle class; on the other hand, the family in the upper class felt a resistance to identifythemselves as upper class and considered to be "like everyone else".

  • 14853.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Material Science.
    A new test method for measuring the galling resistance between metal powders and die tool materials in powder compaction2010In: 14th Nordtrib Conference, Storforsen, Sweden, 2010Conference paper (Refereed)
    Abstract [en]

    The friction characteristics and galling resistance between metal powder and die tool material in metal powder compaction is of outmost importance since they will influence the porosity and surface quality of the green body and consequently the porosity, tolerances and surface quality of the final sintered product. In the present study, a new test method for evaluating the tribological performance of die tool materials aimed for powder compaction is presented. The test method is based on controlled scratch testing using a commercial scratch tester but instead of the commonly used Rockwell C diamond stylus a sample holder with a small green body of compacted powder particles is drawn over the surface in a well controlled multi pass linear reciprocating sliding contact. The capability of the test method was evaluated for different types of tool materials including two PVD coatings in contact with different types of metal powders to determine the friction characteristics and the adhesion and material transfer tendency at the sliding interface. Post-test examination of the tool surfaces using FEG-SEM, EDS and 3D surface profilometry were performed in order to evaluate the mechanisms controlling the friction behavior and the material transfer tendency.

  • 14854.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Material Science.
    A new test method for measuring the galling resistance between metal powders and die tool materials in powder compaction2011In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 273, no 1, p. 49-54Article in journal (Refereed)
    Abstract [en]

    The friction characteristics and galling resistance between metal powder and die tool material in metal powder compaction is of outmost importance since they will influence the porosity and surface quality of the green body and consequently the porosity, tolerances and surface quality of the final sintered product. In the present study, a new test method for evaluating the tribological performance of die tool materials aimed for powder compaction is presented. The test method is based on controlled scratch testing using a commercial scratch tester but instead of the commonly used Rockwell C diamond stylus a sample holder with a small green body of compacted powder particles is drawn over the surface in a well controlled multi pass linear reciprocating sliding contact. The capability of the test method was evaluated for different types of tool materials including two PVD coatings in contact with different types of metal powders to determine the friction characteristics and the adhesion and material transfer tendency at the sliding interface. Post-test examination of the tool surfaces using FEG-SEM and EDS were performed in order to evaluate the mechanisms controlling the friction behavior and the material transfer tendency. The results show that the proposed test is a simple and fast method to obtain relevant data regarding the friction and galling characteristics of die tool materials in metal powder compaction. The mechanisms prevailing at the green body/die tool material interface, e.g. cold welding, can easily be monitored by the friction and acoustic emission signals. Of the die tool materials investigated the low friction PVD a-C:Cr coating displayed the lowest friction and highest galling resistance.

  • 14855.
    Olsson, Mikael
    Dalarna University, School of Information and Engineering, Materials Technology.
    Characterization of hot-rolled and annealed oxides on 2507 stainless steel – Microstructure, chemical composition, mechanical properties and pickling characteristics2021Report (Other academic)
    Abstract [en]

    The surface characteristics of samples of the 2507 super duplex stainless steel with three different surface conditions, i.e. after hot rolling, annealing and blasting plus pickling, respectively, have been investigated. High resolution scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and scratch testing have been used to characterize the oxide scales with respect microstructure, chemical composition, and mechanical properties.

    SEM and EDS-analysis of the oxide scales formed on hot rolled and hot rolled plus annealed samples, show an outer Fe-rich oxide layer and an inner Cr-rich oxide layer close to the interface. While the hot rolled oxide scale displays a relatively porous oxide composed of oxide particles, the hot rolled plus annealed oxide scale displays a more dense, “sintered”, microstructure, i.e. the high temperature during the annealing step promotes a densification of the oxide scale microstructure.

    The outer porous Fe-rich layer shows poor cohesive strength and poor adhesion to the underlying Cr-rich layer. In contrast, the inner more dense Cr-rich layer shows strong adhesion towards the 2507 duplex stainless steel. The dense microstructure and strong adhesion of the inner Cr-rich layer is believed to significantly influence the blasting and pickling characteristics.

  • 14856.
    Olsson, Mikael
    Dalarna University, School of Information and Engineering, Materials Technology.
    Characterization of oxide layers formed on pilot plant Steckel rolled 304 stainless steel samples2021Report (Other academic)
    Abstract [en]

    The evolution of oxide scales on 304 austentic stainless steel during Steckel mill rolling has been investigated by performing pilot trials at Swerim Luleå. The influence of Steckel furnace conditions, i.e. temperature, time and excess oxygen, at reheating between subsequent roll passes have been evaluated and the resulting surface structures have been characterized.

    High resolution scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to characterize the oxide scales with respect microstructure and chemical composition. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to analyze the chemical composition at the stainless steel / oxide interface region.

    In common for all Steckell rolled samples investigated was a pronounced rough surface morphology and the surface roughness was found to increase with more iterations of rolling. Also, the amount of oxides in the rolled surface tends to increase with longer heating times and more iterations of rolling. 

    Surface areas, less distorted by the rolling contact, displayed an oxide scale with an outer rather well-defined oxide layer with relatively large grains and an inner, less well defined, oxide layer. EDS-analysis show that the outer oxide mainly consists of Fe2O3, whereas the inner oxide layer corresponds to a chromium rich (Cr,Fe)2O3 oxide combined with areas of partly oxidized stainless steel. ToF-SIMS analysis of the stainless steel / oxide interface region show the presence of B, Ca and Cu in connection to the oxides.

  • 14857.
    Olsson, Mikael
    Dalarna University, School of Information and Engineering, Materials Technology.
    Influence of annealing on hot-rolled oxides on 2507 stainless steel2021Report (Other academic)
    Abstract [en]

    The influence of annealing on the oxide scale characteristics of hot rolled samples of 2507 super duplex stainless steel have been investigated using well controlled lab scale annealing experiments. High resolution scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to characterize the oxide scales with respect microstructure and chemical composition.

    SEM and EDS-analysis of the oxide scales after annealing show an outer Fe-rich oxide layer and an inner Cr-rich oxide layer close to the interface. While the hot rolled oxide scale displays a relatively porous oxide composed of oxide particles, the hot rolled plus annealed oxide scale displays a more dense, “sintered”, microstructure.

    The annealing peak temperature was found to have a strong impact on the oxide scale microstructure. The higher peak temperature, 1150 °C, resulted in a significantly denser microstructure with more pronounce, larger grains, as compared with the lower peak temperature, 1100 °C, which resulted in a less dense microstructure. In contrast, the influence of annealing atmosphere, was found to be relatively small.

  • 14858.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Material Science.
    Influence of tool steel microstructure on the prevailing wear mechanisms in metal powder compaction2011In: Proceednings of the 18th International Conference on Wear of Materials, Philadelphia, USA, 2011Conference paper (Other academic)
  • 14859.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    On the use of scratch testing as a model experiment for evaluating the initial wear of cemented carbidein rock drilling2013Conference paper (Refereed)
  • 14860.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Surface and wear characteristics of electrical discharge machined (EDM) cemented carbide drawing dies2014In: Jernkontorets Forskning, ISSN 0280-2481Article, review/survey (Other academic)
  • 14861.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Material Science.
    Tribologi i samband med pulverkompaktering2011In: Stålforskningsdagar 2011 : materialteknik vid Högskolan Dalarna / [ed] Storck, Joakim, Borlänge, 2011Conference paper (Other academic)
  • 14862.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Tribological aspects of conventional wire drawing - A case study2014In: Jernkontorets Forskning, ISSN 0280-2481Article, review/survey (Other academic)
  • 14863.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Material Science.
    Tribological evaluation of some potential tribo materials used in column lift rolling contacts: a case study2011In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 270, no 9-10, p. 720-724Article in journal (Refereed)
    Abstract [en]

    The friction and wear characteristics of some potential tribological pairs aimed for the wheel/rail rolling contact in column lifts were studied. Tribo tests were performed using a pin-on-disc equipment and the tribological pairs included; stainless steel against ball bearing steel, stainless steel against WC/C-coated ball bearing steel and stainless steel against cast nylon (polyamide 6). The influence of coating surface topography as well as stainless steel surface topography on the friction and wear behaviour of the tribological pairs was investigated. The results show that the WC/C-coating significantly improves the tribological performance of the stainless steel/ball bearing steel sliding couples but that the WC/C-coating show a limited life-time in sliding contact with stainless steel under the prevailing contact conditions. In contrast, the stainless steel/ball bearing steel sliding couples suffer from high friction and wear due to strong adhesion between the mating surfaces followed by metal transfer and severe adhesive wear. The stainless steel/cast nylon sliding couples show a somewhat intermediate behaviour regarding friction and wear where the friction is controlled by the generation of a polymer transfer film and wear of the cast nylon is controlled by the surface topography of the mating stainless steel surface. The results obtained are discussed in relation to the identified friction and wear mechanisms as characterized by SEM and EDX.

  • 14864.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Tråddragningens tribologi2015In: Nordisk Trådteknisk Förening: Årsbok 2015 / [ed] Leif Eriksson, NTTF , 2015Chapter in book (Other academic)
  • 14865.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Wear resistant materials in mining, drilling and rock handling2014Conference paper (Other academic)
  • 14866.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Bexell, Ulf
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Friction characteristics and material transfer tendency in metal powder compaction2011In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 271, no 9-10, p. 1903-1908Article in journal (Refereed)
    Abstract [en]

    The friction characteristics and material transfer tendency between metal powder and die tool material in metal powder compaction play an important role in the production of near-net-shape components of high density. A natural step to further increase the green density and simplify the sintering process is to reduce the amount of internal lubricant in the powder since the volume fraction of an organic lubricant will result in a significant contribution to the resulting porosity. However, this will significantly increase the adhesive contact and thus the friction between the die and the powder/green body during the powder compaction process. As a result, the compaction and ejection forces as well as the wear rate of the die and punch surfaces will increase. Consequently, improved knowledge concerning the friction mechanisms prevailing at the metal powder/die tool material interface is needed. The present paper will present data regarding the influence of type of tool and coating material on the friction characteristics and material transfer tendency during simulated powder compaction of a water atomized plain iron powder under no or starved lubrication conditions using two different laboratory tribo tests. Tool materials investigated include ingot cast tool steel, powder metallurgy (PM) tool steel and TiAlN and DLC-type PVD coatings. Post-test characterization using scanning electron microscopy and energy dispersive X-ray spectroscopy was used to analyse the tribo surfaces and especially the tendency to material transfer and tribo film formation. The results show that the material transfer tendency is mainly controlled by strong adhesive metal–metal contacts and that a PVD coating showing intrinsic low-friction properties and a smooth surface topography may significantly reduce the interaction between the mating surfaces promoting a stable friction and a low material transfer tendency.

  • 14867.
    Olsson, Mikael
    et al.
    Dalarna University, School of Information and Engineering, Materials Technology.
    Cinca, Nuria
    Mechanisms controlling friction and material transfer in sliding contacts between cemented carbide and aluminum during metal forming2024In: International journal of refractory metals & hard materials, ISSN 0263-4368, Vol. 118, article id 106481Article in journal (Refereed)
    Abstract [en]

    Cold forming of aluminum alloys is frequently associated with problems related to severe adhesion and material transfer onto the forming tools which results in high friction forces and negatively affects the surface quality of the formed parts, a phenomenon frequently named galling. In the present study, well controlled laboratory tests using a scratch testing equipment have been performed to evaluate the friction characteristics and investigate the mechanisms controlling the initial transfer of aluminum in dry sliding contact with five different cemented carbide grades. In the tests, an aluminum pin (representing the work material) with a conical tip slides against a flat, fine-polished, cemented carbide surface (representing the tool). During sliding, the mechanical contact results in plastic deformation and flattening of the work material against the tool surface, thus simulating a metal forming contact. The small scale and well-defined tribo contact in combination with post-test surface characterization using optical surface profilometry, high resolution SEM and EDS makes it possible to evaluate the influence of material transfer on the friction characteristics.The results show that sub-mu m surface irregularities in the cemented carbide surface trigger mechanical interaction with the softer aluminum surface which promotes aluminum transfer to the cemented carbide surface resulting in high friction. Common surface irregularities, promoting aluminum transfer, are sharp edges of slightly protruding carbide grains, surface steps in connection to binder phase pockets, surface steps in connection to surface pores, etc. It should be noted that even very small surface steps, < 20 nm in height, constitute efficient cutting edges able to effectively cut off the passing aluminum material and thus have a very strong impact on material transfer. In contrast, the effect of carbide composition, e.g. the presence of cubic carbides of different composition, seems to be of minor importance to reduce the adhesion and the tendency to material transfer.

  • 14868.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Heinrichs, J
    Uppsala Universitet.
    Yvell, Karin
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Jacobson, S
    Uppsala Universitet.
    On the relevance of hardness as a material parameter in the deformation and wear of  cemented carbides in rock drilling2014Conference paper (Refereed)
  • 14869.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Heinrichs, J
    Uppsala Universitet.
    Yvell, Karin
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Jacobson, S
    Uppsala Universitet.
    Towards a better understanding of the wear of cemented carbide drill bit inserts in rock drilling2014Conference paper (Other academic)
  • 14870.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Heinrichs, Jannica
    Yvell, Karin
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Jacobson, Staffan
    Initial degradation of cemented carbides for rock drilling: model studies of the tribological contact against rock2015In: International journal of refractory metals & hard materials, ISSN 0263-4368, Vol. 52, p. 104-113Article in journal (Refereed)
    Abstract [en]

    Hardness and fracture toughness are often used as the prime material parameters to characterise cemented carbides used in rock drilling. However, the deformation and wear of cemented carbide are too complicated to be described by these parameters alone. The cemented carbide and the wearing rock mineral are both composite materials, containing phases with widely varying hardness. Moreover, the deformation behaviour of the individual phases may be strongly anisotropic, as for the WC grains in the cemented carbide. The wear of the cemented carbide typically occurs on the scale of individual grains or smaller. Contrastingly, the hardness stated for both is typically a macroscopic value, averaged over numerous grains, orientations, etc. The present investigation aims to contribute to the understanding of the relations between microstructure, properties and wear mechanisms of cemented carbide buttons in rock drilling. It is focused on the role of scale of deformation in relation to size of the different phases of the cemented carbide. This is achieved by simplifying the contact situation of the rock drill button to a single stylus sliding contact between a granite stylus and a polished cemented carbide surface. The deformation and wear of this well controlled contact is then evaluated on the sub-micrometer scale; using high resolution FEG-SEM with EBSD, FIB cross-sectioning and AFM. The results show that even an extremely local deformation, such as slip within individual WC grains, affects the tribological contact, and that the nominally much softer granite may cause deformation both within individual WC grains, and on the composite scale. The results are discussed with respect to their significance for wear of cemented carbides in rock drilling. (C) 2015 Elsevier Ltd. All rights reserved.

  • 14871.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Hogmark, Sture
    Wear mechanisms of HSS cutting tools2008In: Gear Solutions, ISSN 1933 - 7507, Vol. June, p. 20-29Article in journal (Refereed)
  • 14872.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Högman, B
    Uddeholms.
    Influence of tool steel microstructure on the prevailing wear mechanisms in metal powder compaction2012In: TOOL 2012 : proceedings of the 9th international tooling conference, developing the world of tooling, Montanuniversität Leoben 11-14 September 2012 / [ed] Herald Leitner, Regina Kranz, Angelika Tremmel, Knittelfeld: Gutenberghaus , 2012, p. 409-416Conference paper (Refereed)
  • 14873.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Karlsson, P.
    Eriksson, Jenny
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Gåård, A.
    Krakhmalev, P.
    Bergström, J.
    Galling resistance evaluation of tool steels by two different laboratory test methods for sheet metal forming2011In: Proceedings of the 18th International Conference on Wear of Materials, Philadelphia, USA, 2011Conference paper (Other academic)
  • 14874.
    Olsson, Mikael
    et al.
    Dalarna University, School of Information and Engineering, Materials Technology.
    Lundin, Peter
    Swerim.
    Samuelsson, Jan-Erik
    Erasteel Kloster.
    Tjerngren, Peter
    SMT/Alleima.
    Åhlberg, Richard
    Fagersta Stainless.
    Börjesson, Malin
    Kanthal.
    Balazs, Emil
    Ovako.
    Färre ytfel på varmvalsade produkter2022Report (Other academic)
  • 14875.
    Olsson, Mikael
    et al.
    Dalarna University, School of Information and Engineering, Materials Technology.
    Lundin, Peter
    Swerim.
    Samuelsson, Jan-Erik
    Erasteel Kloster.
    Tjerngren, Peter
    SMT/Alleima.
    Åhlberg, Richard
    Fagersta Stainless.
    Börjesson, Malin
    Kanthal.
    Balazs, Emil
    Ovako.
    YTFEL Deelrapport - Verksförsök2022Report (Other academic)
  • 14876.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Malmros, M.
    Bexell, Ulf
    Wiklund, U.
    Assessing the mechanical and electrical properties of aluminium oxid on aluminium using nanoindentation and nonoscratching2011In: Proccedings of the 18th International Conference on Wear of Materials, Philadelphia, USA, 2011Conference paper (Other academic)
  • 14877.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Sandberg, Odd
    Tribological evaluation of tool materials for powder compaction2010In: Proceedings of the World Powder Metallurgy Congress and Exhibition, World PM 2010, Florence, 2010, Vol. 5Conference paper (Refereed)
    Abstract [en]

    The friction characteristics and material transfer tendency between metal powder and tool material in metal powder compaction have been evaluated using a new tribo test method. The method is based on controlled scratch testing using a commercial scratch tester but instead of the commonly used Rockwell C diamond stylus a sample holder with a small green body of compacted powder particles is drawn over the surface in a well controlled multi pass linear reciprocating sliding contact. In the present study a number of combinations of metal powder and tool materials have been evaluated with respect to the friction characteristics and the sticking and cladding tendency at the sliding interface. Post test scanning electron microscopy and energy dispersive X-ray spectroscopy in combination with 3D white light interferometry were used to analyse the tool material surfaces and material pick-up tendency. The tribological performance of potential powder compacting tool materials is discussed in relation to the identified friction and wear mechanisms.

  • 14878.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Surreddi, Kumar Babu
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Scratch testing of cemented carbides - Influence of Co binder phase and WC grain size on surface deformation and degradation mechanisms2018In: Proceedings of The 18th Nordic Symposium on Tribology - Nordtrib 2018 / [ed] Staffan Jacobson, Uppsala: Uppsala University, 2018Conference paper (Refereed)
    Abstract [en]

    In the present study, the microstructural response of some commercial cemented carbide grades during scratchinghas been analyzed and evaluated by a number of post-test characterization techniques. The influence of Co binder phase content and WC grain size on the deformation and degradation on a WC grain size scale and on a composite scaleare evaluated. The results clearly illustrate the complexity of deformation, degradation and wear of cemented carbide and the dynamics of the diamond stylus / cemented carbide contact during the scratching event. For all cementedcarbide grades the microstructure has a strong impact on the observed degradation mechanisms and the resistance to deformation and degradation was found to increase with decreasing Co content and decreasing WC grain size.

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  • 14879.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Surreddi, Kumar Babu
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Thin hard CVD and PVD coatings and their potential in steel wire drawing applications2018In: Proceedings of The 18th Nordic Symposium on Tribology - NORDTRIB 2018 / [ed] Staffan Jacobson, Uppsala: Uppsala University, 2018Conference paper (Refereed)
    Abstract [en]

    In the present work, the potential of using thin hard CVD and PVD coatings in order to improve the performance of cemented carbide steel wire drawing nibs is evaluated. Coating materials include some state-of-the-art CVD and PVD coatings and pre- and post-coating treatments were used to improve the surface topography of the coated functional surfaces. The tribological performance of the coatings has been evaluated by sliding wear tests and wire drawing experiments under well controlled conditions. Post-test characterization of the coated nibs using 3D optical surface profilometry, scanning electron microscopy and energy dispersive X-ray spectroscopy illustrates the pros and cons of the two deposition techniques but also that the coatings have a potential to improve the performance of cemented carbide nibs in steel wire drawing applications.

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  • 14880.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Wadman, B.
    Eriksson, Jenny
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Schedin, E.
    Madsen, E.
    Bay, N.
    Influence of stainless steel surface texture on galling2011In: Proceedings of the 18th International Conference on Wear of Materials, Philadelphia, USA, 2011Conference paper (Other academic)
  • 14881.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology. Ångström Tribomaterials Group, Uppsala University.
    Yvell, Karin
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Heinrichs, J.
    Bengtsson, M.
    Jacobson, S.
    Surface degradation mechanisms of cemented carbide drill buttons in iron ore rock drilling2017In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 388-389, p. 81-92Article in journal (Refereed)
    Abstract [en]

    The wear behavior of cemented carbide rock drill buttons is influenced by many factors, which include the composition and microstructure of the cemented carbide material, the nature of the rock material, and the conditions of the rock drilling operation. Depending on the type of rock and on the drilling procedure used, the cemented carbide is exposed to substantially differing mechanical and thermal conditions. In the present study, the surface degradation and wear mechanisms of cemented carbide drill buttons exposed to iron ore rock drilling have been characterized based on a combination of high resolution scanning electron microscopy (SEM), focused ion beam cross-sectioning (FIB), energy-dispersive X-ray spectroscopy (EDS) and electron back scatter diffraction (EBSD).The results show a significant difference in surface degradation and wear between the front and peripheral buttons of the drill bits. While the front buttons display a relatively smooth worn surface with shallow surface craters the peripheral buttons display a reptile skin pattern, i.e. plateaus, 200-300. μm in diameter, separated by valleys, typically 40-50. μm wide and 15-30. μm deep, The reptile skin pattern is obtained in regions where the peripheral buttons are in sliding contact against the drill hole walls and exposed to high surface temperatures caused by the frictional heating. The results indicate that the reptile skin pattern is related to friction induced thermal stresses rather than mechanical contact stresses, i.e. the reptile skin pattern is formed due to thermal fatigue, rather than mechanical fatigue, caused by the cyclic frictional heating generated at the cemented carbide button/iron ore interface.

  • 14882.
    Olsson, Mikael
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Yvell, Karin
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Heinrichs, Jannica
    Uppsala University.
    Bengtsson, Maria
    LKAB Wassara AB.
    Jacobson, Staffan
    Uppsala University.
    Surface degradation mechanisms of cemented carbide drill buttons exposed to iron ore rock drilling2016In: Proceedings of the 17th Nordic Symposium on Tribology - Nordtrib 2016, 2016Conference paper (Refereed)
    Abstract [en]

    The wear behavior of cemented carbide rock drill buttons is influenced by many factors, which include the composition and microstructure of the cemented carbide material, plus the conditions of the rock drilling operation, such as drilling parameters, drill button geometry and the nature of the rock material. Depending on the type of rock and on the drilling procedure used, the cemented carbide is exposed to substantially differing mechanical and thermal conditions. Under conditions of high mechanical stress and high temperatures, typical for drilling in highly abrasive rocks such as granite, the worn cemented carbide buttons are usually very smooth, with the roughness limited to within the size of individual WC grains. When drilling under conditions of moderate mechanical stress and high temperatures, typical for drilling in low-abrasive rock, such as ores with e.g. magnetite, the surface damage of the buttons usually includes a macroscopic surface wear pattern, commonly referred to as “reptile skin”, in an otherwise smooth surface. The crack growth associated to the valleys of the reptile skin pattern eventually leads to catastrophic fracture of the button, unless the cracked surface layer is repeatedly ground off before the cracks grow too deep. So despite the low general wear rate, the wear life of drill buttons becomes severely restricted by the surface cracks. The present study focuses on revealing the degradation mechanisms behind the formation of the reptile skin. This is done by analyzing drill buttons exposed to different stages of degradation and wear from drilling in iron ore. The work is based on a combination of high resolution scanning electron microscopy (SEM), focused ion beam microscopy (FIB), energy-dispersive X-ray spectroscopy (EDS) and electron back scatter diffraction (EBSD).

  • 14883.
    Olsson, Mikael
    et al.
    Dalarna University, School of Information and Engineering, Materials Technology.
    Åhlberg, Richard
    Fagersta Stainless.
    YTFEL Delrapport - Ytfelsatlas2022Report (Other academic)
  • 14884.
    Olsson, Oskar
    Dalarna University, School of Education, Health and Social Studies, Educational Work.
    En problematisering av skolans värdegrund: Tre lärares tolkningar av människolivets okränkbarhet2016Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Problemområdet för arbetet är skolans värdegrund och hur denne är väldigt kontextuell och

    svårdefinierad. Detta problemområde uppstod under flertalet vikariat runt om i Sverige, där

    upptäcktes stora skillnader i hur skolorna tolkade värdegrunden.

    Detta arbete ämnar att analysera och problematisera begreppet ”människolivets

    okränkbarhet” utifrån tre lärares föreställningar kring begreppet samt eventuella tolkningar utifrån tidigare forskning.

    Metoden som används för insamling av data är kvalitativa intervjuer. Tre intervjuer har

    genomförts, där vardera intervju varade i 30 minuter. Urvalet grundades på bekvämlighetsurval p.g.a. tidsbrist, men krav ställdes på att lärarna skulle vara verksamma.

    Resultatet visar på att lärarna har svårigheter att tolka ”människolivets okränkbarhet”.

    Lärarna försöker tolka varje enskild del i begreppet, d.v.s. livet, människan och okränkbarhet utan att finna en gemensam definition. Lärarna enas i alla fall om att begreppet är ett kontextuellt begrepp som kräver en djupgående förståelse.

    Slutsatsen av arbetet blir att det är nästan omöjligt att finna en ”korrekt” definition av

    begreppet; ”Människolivets okränkbarhet”. Därav så blir slutsatsen av arbetet att en ständig

    diskussion krävs av lärarna. Där man kontextualiserar och problematiserar begreppet hela tiden, så att man som lärare ges möjlighet att ge eleverna kunskap inom ämnet. En kunskap som innebär en 1 kontextuell förståelse kring ett svårdefinierat begrepp.

  • 14885.
    Olsson, Ossian
    et al.
    Dalarna University, School of Education, Health and Social Studies, Caring Science/Nursing.
    Sobarzo Miranda, Andre´s
    Dalarna University, School of Education, Health and Social Studies, Caring Science/Nursing.
    Sjuksköterskors upplevelser av sina kunskaper i hot- och våldsamma situationer inom psykiatrisk slutenvård: En kvalitativ intervjustudie2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Aim: The study aims to describe nurse´s experiences of their theoretical and

    practical knowledge in threatening and violent situations in psychiatric ward.

    Method: A qualitative design was chosen for this study and semi structured

    interviews were conducted with five nurses working in a psychiatric clinic. The

    interviews were transcribed and the analysis was done using Graneheim and

    Lundmans qualitative content analysis method. Result: The main results show that

    nurses often describe a lack of formal knowledge but some of them possess at the

    same time a “tacit knowledge” which is harder to concrete. To “believe in one’s

    knowledge” was one of many important factors that affected the nurse’s abilities to

    carry out their knowledge. Besides more training and education in threatening- and

    violent situations these factors should also be able to change in order to strengthen

    the nurse’s knowledge. Conclusion: All nurses that were interviewed experienced

    that threatening- and violent situations are an important issue and most of them

    expressed a desire of more training and education in this matter.

  • 14886.
    Olsson, Pia
    Dalarna University, School of Humanities and Media Studies, German.
    Eine rhetorische Analyse von einer Rede AngelaMerkels2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 14887.
    Olsson, Rigmor
    et al.
    Dalarna University, School of Health and Social Studies, Caring Science/Nursing.
    Ryen, Ingela
    Dalarna University, School of Health and Social Studies, Caring Science/Nursing.
    Barn och ungdomars upplevelser av separation sett ur ett omvårdnadsperspektiv.: Systematisk litteraturstudie.2008Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [sv]

    Syftet med denna studie var att belysa barn och ungdomars erfarenheter, upplevelser och eventuella risk-och skyddsfaktorer i samband med föräldrarnas separation. Undersöka betydelsen av goda familjerelationer och vilka möjliga stödåtgärder sjuksköterskor kan använda för att hjälpa barn och ungdomar som inte mår bra av en separation. Metoden var utformad som en retrospektiv systematisk litteraturstudie och sökningar gjordes i databaser, framförallt via Högskolan Dalarna bibliotek. I resultatet framkommer hur barn upplever separationer, både positiva och negativa aspekter. Bra relationer både inom och utom familjen är viktiga för barnen vilket framkommer genomgående i arbetet. Umgängesföräldern har en viktig roll för barnen. Själva boendet spelar oftast inte så stor roll så länge barnen har bra relation till, regelbundet umgänge med, båda föräldrarna. Många riskfaktorer för barnen är ändå kopplade till separationer och barnen kan må psykiskt dåligt ända upp i vuxen ålder. Sjuksköterskan i barn- och skolhälsovården kan använda sig av olika verktyg för att hjälpa barn och föräldrar efter en separation. Familjefokuserad omvårdnad är en omvårdnadsmodell som lämpar sig väl för familjer i svåra och konfliktfyllda situationer.

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  • 14888.
    Olsson, Robert
    et al.
    Dalarna University, School of Education, Health and Social Studies, Caring Science/Nursing.
    Olsson, Ellinor
    Dalarna University, School of Education, Health and Social Studies, Caring Science/Nursing.
    Främjande faktorer för sjuksköterskor att bedriva en evidensbaserad vård2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background

    Evidence-based practice (EBP) is a well-known term used to ensure that patients receive a

    safe care based on the best research evidence, clinical expertise and patient individual

    preferences. A variety of studies have examined the barriers for nurses to conduct and/or

    implement EBP to explain the gap that can occur between theory and practice. Fewer studies

    have examined the factors facilitating nurses’ use of EBP.

    Aim

    Was to describe the factors facilitating nurses’ use of evidence-based practice through a

    literature review.

    Methods

    The study was conducted as a literature review. The databases searched were CINAHL,

    PubMed and Web of Science and 15 articles were chosen for the result (8 qualitative, 4

    quantitative and 3 mixed-method).

    Results

    Five categories were identified as facilitating factors for nurses to conduct and/or implement

    EBP; work environment, support, knowledge, nurses’ attitude and organization. Support from

    facilitators were the most emerging factor.

    Conclusion

    Nurses have individual responsibility to conduct EBP and can through their attitude influence

    that it’s being used, though a majority of the facilitating factors identified were more direct

    connected to the leadership and managerial part in facilitating the use of EBP.

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  • 14889.
    Olsson, Ronja
    Dalarna University, School of Education, Health and Social Studies, Educational Work.
    "Den är ju så viktig, för att man ska må bra.": En intervjustudie om förskollärares uppfattning om barns självkänsla i förskolan2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studien syftar till att skapa kunskap om hur förskollärare uppfattar självkänsla och vilka erfarenheter de beskriver av att arbeta med detta. Tre intervjuer genomfördes med totalt fyra förskollärare från tre olika förskolor. Arbetet har centrerats kring hur självkänsla kan definieras, hur uttryck för barnens självkänsla kan identifieras samt hur förskolan kan arbeta för att stödja barnens utvecklande av självkänsla. Självkänsla antas vara betydande för den psykiska hälsan och en stor del av de teoretiska utgångspunkter som använts i arbetet är också riktad mot psykisk hälsa. Studiens slutsatser inkluderar att självkänsla kan tänkas utvecklas på flera sätt och att olika teorier kan vara relevanta för olika aspekter av självkänslan. Studiens resultat visar även att det finns flera organisatoriska aspekter i förskolan som kan uppfattas som påverkande faktorer för barnens förutsättningar att utveckla självkänsla. Vidare finns underlag som tyder på att självkänsla kan anta många olika uttryck samt att det är ett komplext och viktigt fenomen.

  • 14890.
    Olsson, Sara
    et al.
    Dalarna University, School of Health and Welfare.
    Nordkvist, Camilla
    Dalarna University, School of Health and Welfare.
    Faktorer som påverkar hopp hos cancersjuka patienter- En litteraturöversikt2023Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background Cancer is a broad term that has often been associated with death where hope has been lost. In previous generations, many people died of cancer, but research into cancer has led to healthcare today being able to treat and in some cases cure cancer. Survival in cancer has increased significantly, which gives cancer patients more hope. Research show that cancer patients gain more hope if they have good knowledge and information about cancer. People with cancer who have no hope often lose both motivation and adherence to treatment and measure that can alleviate or cure cancer. Aim To describe factors that influence hope in cancer patients. Method The study was conducted as a structured literature study with elements of the methodology used in systematic reviews. The databases used were PubMed andCINAHL. Results From the analysis, three themes were identified: Social network, physical factors and mental factors. Because cancer patients who have a good social network, studies show that the level of hope increases when these patients receive good support from their relatives. Focusing on treating pain in cancer patients increases the level of hope for those cancer patients who suffer from pain. Acceptance is an important aspect for cancer patients as this gives increased hope. Cancer patients can feel hope by having a socialnetwork, a religious belief or if cancer patients are free from psychological and physical ailments. Conclusions It is important to treat/care for the areas that cause the cancer patient to feel no hope. Without hope, the cancer patient loses the spark of life and becomes less resistant to his cancer diagnosis.

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  • 14891.
    Olsson, Sara
    et al.
    Dalarna University, School of Education, Health and Social Studies, Social Work.
    Renhuvud, Carina
    Dalarna University, School of Education, Health and Social Studies, Social Work.
    Flyktingguide: En väg till integration?: Brukarutvärdering av projektet Flyktingguide i Falun2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this qualitative user evaluation participants in the project refugee guide, Falun, was interviewed about their experience of the project and how the project contributed to their integration into society and establishment on the labor market. The collection of empirical data has been made by six interviews. The results of the evaluation indicate that participants feel that they through the project had the opportunity to meet new people, practice the language and learn about each other's culture. The results also show that participants are satisfied with the project. Some participants expressed a desire to meet with several people at once while others don´t have that need. Furthermore, the interviews shows that establishment on labor market occurred through job placement and not through participation in the project. Integration proved to be a difficult concept to define, but the interviews show that the participants have a perception that it is about learning the Swedish language and culture.

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  • 14892.
    Olsson, Signe
    et al.
    Dalarna University, School of Culture and Society.
    Åkerström, Matilda
    Dalarna University, School of Culture and Society.
    Finn Fem(ton) Fel: En studie om hur påtagligt kontinuitetsfel i film och serier är för tittaren2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I denna uppsats berör vi vad kontinuitetsfel är, hur de uppstår och huvudtanken med Walter Murchs klippteknik the Rule of Six. Vi undersöker hur kontinuitetsfel gällande rörelse och objekt mottages hos tittaren och relevansen av Murchs klippteknik. För att samla in svar utformades en kvalitativ enkät med frågor om hur deltagarna påverkas och tänker kring scener som innehåller kontinuitetsfel. Resultatet av undersökningen visade att en stor del av deltagarna inte märkte något kontinuitetsfel till en början. När vi informerat om vad kontinuitetsfel är och att de finns i scenerna så upptäckte alla deltagare minst ett kontinuitetsfel. Vi kunde även konstatera att Murchs klippteknik fortfarande är relevant. Resultatet har bidragit med en större förståelse av hur deltagarnas tankegång kring kontinuitetsfelen varit. 

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  • 14893.
    Olsson, Simon
    Dalarna University, School of Humanities and Media Studies, History.
    Interkulturell kompetens genom läroböcker i historia: En undersökning av historieläroböcker för dagens mångkulturella gymnasieskola. Med utgångspunkt från interkulturell kompetens analyseras läroböckers innehåll avgränsat till den svenska folkhems- och välfärdssamhälleshistorien.2020Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Det mångkulturella samhällets ökade behov av interkulturell kompetens ställer krav på att eleverna ges möjlighet att utveckla denna kompetens i skolan och historieämnet är en viktig del i denna process. Tidigare forskning visar emellertid att bland annat historieläroböcker utgivna i enlighet med tidigare läroplaner har haft en tendens att exkludera vissa elever för att läroböckerna orienterats kring Sverige och svenskarna i narrativ som påverkats av den svenska historiekulturen. Sådana läroböcker bistår inte behovet av interkulturell kompetens. Syftet med examensarbetet är att undersöka innehållet i dagens historieläroböcker för gymnasieskolan med utgångspunkt från interkulturell kompetens. En av arbetets frågeställningar fokuserar till exempel på läroböckers narrativ och identifikationer, och huruvida de kan tänkas möjliggöra eller försvåra elevernas utveckling av nämnda kompetens. Historieläroböckers narrativ och påbjudna identifikationer undersöks avgränsat till läroböckernas avsnitt om folkhemmet och välfärdssamhället. Läroböckernas narrativ och påbjudna identifikationer undersöks därefter just i fråga om elevernas utveckling av interkulturell kompetens. För att uppfylla syftet undersöks tre historieläroböcker avsedda för gymnasieskolan. Först undersöks respektive lärobok avgränsat till temat folkhems- och välfärdssamhälleshistorien, detta för att utröna respektive läroboks narrativ om temat. Därefter sammanställs narrativen till ett övergripande narrativ som analyseras vidare, först med fokus på vilka identifikationer som påbjuds och därefter med utgångspunkt från interkulturell kompetens. Undersökningen visar på läroböckernas narrativa ensidighet och en kronologi i berättelsen om folkhems- och välfärdssamhälleshistorien, vilket talar för en linjär historieskrivning. Av undersökningen framkommer dessutom att elevernas utveckling av interkulturell kompetens lär försvåras. Avsaknaden av perspektivgivning och få möjligheter till tolkning är några aspekter som lär försvåra elevernas utveckling av interkulturell kompetens. Slutsatserna om undersökningen är att de undersökta läroböckernas narrativ uppvisar en ensidighet som begränsar perspektiv och också tolkningsmöjligheterna för de läsande eleverna, att de identifikationer som påbjuds inte talar om något särskilt som specifikt bidrar till utveckling av interkulturell kompetens och slutligen att elevernas utveckling av interkulturell kompetens försvåras snarare än möjliggörs av historieläroböcker avsedda för den svenska gymnasieskolan.

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  • 14894.
    Olsson, Sita
    et al.
    Dalarna University, School of Teacher Education.
    Martinelle, Sofia
    Dalarna University, School of Teacher Education.
    ” Det är såna där trix vi får hålla på med”: En kvalitativ intervjustudie med fem förskollärare om anknytning i förskolan2021Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien är att undersöka förskollärares uppfattningar om betydelsen av barns anknytning till pedagogerna i förskolan. För att uppnå vårt syfte har vi använt oss av kvalitativa intervjuer. Vi har tagit del av fem förskollärares beskrivningar om deras arbetssätt för att skapa trygga relationer till barnen. Vi har gjort en tematisk analys av intervjuerna och därmed fått fördjupad förståelse för hur förskollärarna uppfattar betydelsen av barns anknytning till pedagogerna i förskolan. Resultatet har därefter analyserats med stöd av John Bowlbys anknytningsteori. Några av teorins centrala begrepp som vi använt är trygg bas, anknytningsperson, inre arbetsmodeller och anknytningsmönster. Vår studie visar att anknytning är grundläggande för att barnen ska trivas i förskolan samt för deras utveckling och lärande. I studien synliggörs att förskollärarna arbetar för att skapa trygga relationer och att deras bemötande till barn och vårdnadshavare kan påverka relationerna. Förskollärarna lyfter fram betydelsen av att vara lyhörd för barnens behov och att finna en balans av närhet och distans. Sammanfattningsvis bidrar studien till att fördjupa våra kunskaper om vikten av anknytningens betydelse i förskolan, och att trygghet och omsorg ska prägla förskolans verksamhet.

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  • 14895.
    Olsson, Sofia
    Dalarna University, School of Technology and Business Studies, Human Resource Management.
    Att utvärder ett verktyg, Samtal om Att..: En studie om att kombinera medarbetarsamtal och Attraktivt Arbete2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Medarbetaren är en organisations viktigaste resurs och genom medarbetarsamtal kan

    medarbetarens olika intressen och förmågor tillvaratas. Syftet med denna studie är att i första

    hand utveckla ett verktyg utifrån modellen Attraktivt Arbete som kan ligga till grund för

    medarbetarsamtal. Vidare syftar studien till att utvärdera verktyget genom att undersöka, tolka

    och förstå intervjupersonernas upplevelser av verktyget i faktiska medarbetarsamtal.

    Modellen Attraktivt Arbete syftar till att visa på de kvalitéer som bidrar till att göra arbetet

    attraktivt för nuvarande och kommande medarbetare. Utifrån denna modell har verktyget

    ”Samtal om Att..” utvecklats och därefter utvärderats. För att uppfylla studiens syfte användes

    den kvalitativa metoden intervju, resultatet har sedan utvärderats. Utvärderingen visar att

    verktyget är bra nog för att kunna användas som grund vid medarbetarsamtal och att det

    uppfyller mål och syften

  • 14896.
    Olsson, Sofia
    Dalarna University, School of Teacher Education, Educational Work.
    Från enskilda bokstäver till ord: En studie om lärares arbete med tidig läsinlärning2022Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete utgår från att redogöra kring lärares uppfattning kring den tidiga läsinlärningen. Syftet för studien har utgått ifrån att vilja belysa lärares arbetssätt kring den tidiga läsinlärningen och hur den kan användas i förskoleklass och årskurs 1-2. Vidare undersöks lärares sätt att uppfatta och urskilja elever som befinner sig i risk för att utveckla läs- och skrivsvårigheter och hur lärare kan arbeta för att stötta eleverna och motverka omnämnda svårigheter. Studien utgår med en kvalitativ ansats där semistrukturerade intervjuer genomförts med sex lärare som är verksamma inom förskoleklass och årskurs 1-2. Materialet har därefter analyserats utifrån det sociokulturella perspektivet. Resultatet för studien har påvisat att det finns en outtalad metod som lärare använder som grund för undervisningen i tidig läsinlärning. Samtidigt finns en antydan om att vilja förändra modellen för att det ska fungera till den egna undervisningen. Vidare påvisar resultatet lärares syn kring samarbete med specialpedagog eller speciallärare för att arbeta med de elever som befinner sig i riskzon för läs- och skrivsvårigheter. Upplägget och ansvaret för arbete kring dessa elever befinner sig i en skiljemening utifrån olika lärare vilken lyfts som en implementering för kommande forskning.

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  • 14897.
    Olsson Tegelmark, Dag
    Dalarna University, School of Technology and Business Studies, Forest and Wood Technology.
    Ståndortsindex och produktion för björk och gran på samma mark2000Report (Other academic)
    Abstract [sv]

    På 11 lokaler där björk och gran vuxit i bestånd intill varandra på likartad mark uppskattades ståndortsindex (SI) för gran och björk med hjälp av brösthöjdsålder och höjd på övrehöjdsträd. På 22 lokaler (11 verkliga, 11 simulerade) uppskattades SI för gran och björk med hjälp av ståndortsegenskaper. Sambandet mellan SI för gran och för vårtbjörk sammanfattas i en tabell där SI G24 motsvarar B23 och SI G36 motsvarar B26. Marker där vårtbjörken kan konkurrera med granen i produktion bör vara friska lågörttyper med markvattenklass S eller K. Hög höjd över havet och nordliga breddgrader har också mer negativ påverkan på björkens än på granens tillväxt. På breddgrad 60-61 ºN  upp till 100 m över havet uppskattas då SI för björk till B24-26 och för gran till G25-27.

    På de lägre boniteterna (B23/G24) beräknas volymsproduktionen vara likvärdig för vårtbjörk och gran, medan på de högre boniteterna (B26/G36) beräknas granens medelvolyms-produktion vara upp mot dubbelt så hög som för vårtbjörk. Vårtbjörkens torrsubstansproduktion beräknas däremot överstiga den för gran på de lägre boniteterna och uppgå till ca 80% av granens torrsubstansproduktion på de högre boniteterna. 

    Materialet i studien är begränsat och försiktighet bör iakttagas vid generaliseringar.

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  • 14898. Olsson Tegelmark, Dag
    et al.
    Karlmats, Ulf
    Dalarna University, School of Technology and Business Studies, Wood Technology.
    Kundanalys hos användare av björkvirke2004Report (Other academic)
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  • 14899.
    Olsson Thor, Johan
    et al.
    Dalarna University, School of Technology and Business Studies, Construction.
    Eriksson, Robert
    Dalarna University, School of Technology and Business Studies, Construction.
    Fuktutredning av massivträkonstruktion: Analys av vägg utan ångspärr2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The report is part of a research and development project for Dalarna University,where the goal is to produce a design without a vapour barrier that will meettoday's measure of airtightness and moisture requirements.

    The purpose of this report is to investigate how moisture affects a building withsolid wood and various insulation materials without vapour barrier. Mineral woolinsulation and wood fiber insulation will be compared against each other to seehow they affect the moisture load in a wall. The test object is located in Dalarna,no additional moisture load affect the indoor environment.

    To carry out this work, three different methods are used. A moisture simulationwas performed using the program WUFI, measured values in terms of relativehumidity and temperature were collected over two years from the wall of thebuilding. A sampling was performed with a physical operation on the same levelin the wall where measurement sensors were placed.

    Results are presented in form of graphs and tables where you can read thecurrent state of the construction in terms of relative humidity, temperature,moisture content and microbiological fouling. Insulation materials demonstrate ahigh relative humidity at outer layers of the construction during the wintermonths. The external environment has been shown to play a major part for theresults. No direct microbiological fouling has been detected despite a highcontent of moisture.

    The result of wood fiber insulation demonstrates a better ability to handlemoisture. A further study with a moisture load and 21 degrees indoors should beperformed. But for this study to work it’s recommended to change the currentfacade solution to a two- step sealed facade solution to manage the moistureload in the wall.

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  • 14900.
    Olsson, Tägt Daniel
    et al.
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Engerfelt, Niclas
    Dalarna University, School of Technology and Business Studies, Business Administration and Management.
    Relationsmarknadsföring inom offentlig verksamhet: En Driveranalys2007Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [sv]

    Denna undersöknings syfte är att via en kvalitativ studie av ett exempelföretag utforska huruvida relationsmarknadsföring är applicerbart på offentliga verksamheter. Syftet ämnas att besvaras via en driveranalys av ett exempelföretag, vilket medför en starkt teoretiskt förankrad vetenskaplig utgångspunkt. Undersökningen fann för Dalatrafik givet driveranalysen fog för att påstå att Dalatrafik har förutsättningar för att implementera RM, men att vissa faktorer behöver beaktas om implementeringen skall få genomslagskraft. För RM inom offentlig verksamhet undersökningen ett antal variabler som indikerar att RM och offentliga organisationer inte är helt inkompatibla, men att vissa karaktäristiska problem genererar ytterliggare utmaningar jämfört med aktörer inom privat verksamhet.

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