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  • 1051.
    Åberg-Bengtsson, Lisbeth
    et al.
    University of Borås, School of Education and Behavioural Science.
    von Zeipel, Hugo
    Ottosson, Torgny
    University of Borås, School of Education and Behavioural Science.
    Beach, Dennis
    University of Borås, School of Education and Behavioural Science.
    Can we take young pupils’ understanding of Illustrations for granted? Investigating multi-modally presented learning-contents in school science and mathematics2011Conference paper (Refereed)
    Abstract [en]

    New ways of presenting information have affected both contemporary society and education. School textbooks and other teaching aids for young pupils nowadays typically include, or sometimes entirely build on, illustrations and visual information. During the latest decades our view on literacy has shifted towards also comprising, as a necessity, visual and multimodal literacies Kress (2003). When using visual information in education, the transparency of pictures and models is often regarded as unproblematic. However, transparency is not an innate quality of illustrations and cannot be taken for granted (Pintó & Ametller, 2002). On the contrary, visual information is always coded and interpretations are always related to culture and context, so we must always ask what aspects of illustrations are easily understood by our young pupils’ and what aspects may be stumbling blocks for them.

  • 1052. Ågerfalk, P
    et al.
    Sjöström, J
    Eliasson, E
    Cronholm, S
    [external].
    Goldkuhl, G
    Setting the Scene for Actability Evaluation: Understanding Information Systems in Context2002In: Proceedings of the 9th European Conference on Information Technology Evaluation (ECITE 2002). Jul 15-16, Paris, France, 2002Conference paper (Refereed)
    Abstract [en]

    The paper presents an approach to the evaluation of information systems based on the concept of information systems actability, which is suggested as an important alternative way to understand the role and pragmatic use of IT-systems within organizations. the reults, empirically informed byt two case studies, show that the suggested approach can effectivly be used to direct evaluators' attention to import aspects of an IT-system related to the social actions performed by its use within a business context.

  • 1053. Ågerfalk, Pär
    et al.
    Goldkuhl, Göran
    Cronholm, Stefan
    [external].
    Information Systems Actability Engineering: Integrating Analysis of Business Processes and Usability Requirements1999In: Proceedings of the 4th International Workshop on the Language Action Perspective on Communication Modelling (LAP’99), pp.73–86. Sep 12–13, Copenhagen, Denmark, 1999Conference paper (Refereed)
  • 1054. Ågerfalk, Pär J.
    et al.
    Aakhus, MarkLind, MikaelUniversity of Borås, School of Business and IT.
    Proceedings of the Inaugural Meeting of AIS SIGPrag2008Collection (editor) (Other academic)
  • 1055. Ågerfalk, Pär J.
    et al.
    Delugach, HarryLind, MikaelUniversity of Borås, School of Business and IT.
    Proceedings of the 3rd International Conference on the Pragmatic Web: Innovating the Interactive Society2008Collection (editor) (Other academic)
  • 1056.
    Ågerfalk, Pär. J.
    et al.
    University of Borås, School of Business and IT.
    Karlsson, Fredrik
    University of Borås, School of Business and IT.
    Hjalmarsson, Anders
    University of Borås, School of Business and IT.
    Exploring the Explanatory Power of Actability: The Case of Internet-based Software Artefacts2001Report (Other academic)
  • 1057. Ågerfalk, Pär J.
    et al.
    Lind, MikaelUniversity of Borås, School of Business and IT.Jacucci, Gianni
    Proceedings of the 5th International Conference on Action in Language, Organisations, and Information Systems2008Collection (editor) (Other academic)
  • 1058.
    Åkerberg, Edvard
    et al.
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Olsson, Tommy
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Publika molns funktioner och fördelar2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Many companies today are using the cloud as part of their system architecture. It has become increasingly common for businesses to move their applications to the cloud which makes it possible to access both information and applications over the internet. There are several ways to use cloud services. Businesses can acquire the necessary infrastructure and hardware required to run their applications and make it possible to reach the applications over the internet. There is also the option to rent space in data centers from a third-party provider. This is also referred to as the public cloud. Renting space in the public cloud is beneficial for many reasons as you can get access to multiple data centers worldwide at a low cost. It is also possible to take advantage of the performance of the cloud available if needed without making any investment in hardware or infrastructure. If a business would invest in the infrastructure required to run their own cloud in data centers all over the world it would be very expensive. It is a lot cheaper to rent space in a third-party provider's data center. However, this means that the business must accept the third-party provider’s terms. The information and applications that the business have in the third-party provider’s data centers will be stored together with other clients.

    In this study we look at the functions of cloud services that third-party providers have to offer and what benefits it can bring for development of information systems. This study aims to follow up on businesses that have used cloud services from a third party and then have them describe what benefits they experienced from using the technology.

    To conduct this study interviews have been done with people with lots of experience working with public cloud services from third-party providers. Previous research on the topic have also been studied. An analysis compiled the collected empirical data to create an overview of the relations between the technology and how it can benefit and affect the process for development of information systems. This leads to a conclusion that present how an organization's processes for developing information systems may be affected by the acquisition of public cloud services from third party suppliers. This study shows that functions in the public clouds can significantly improve the development process of information systems. It can provide functions and benefits that can reduce the time it takes to set up a test-environment and also shorten the time it takes to implement applications. It may also lead to reduced costs due to its beneficial pay-as-you-go model but may create a locked-in-effect to the third-party provider.

  • 1059.
    Åkerström, Joakim
    et al.
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Peñaloza Aravena, Carlos
    Semantiska modeller för syntetisk textgenerering - en jämförelsestudie2018Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The ability of expressing feelings in words or moving others with them has always been admired and rare feature. This project involves creating a text generator able to write text in the style of remarkable men and women with this ability, this gift. This has been done by training a neural network with quotes written by outstanding people such as Oscar Wilde, Mark Twain, Charles Dickens, et alt. This neural network cooperate with two different semantic models: Word2Vec and One-Hot and the three of them compound our text generator. With the text generated we carried out a survey in order to collect the opinion of students about the quality of the text generated by our generator. Upon examination of the result, we proudly learned that most of the respondents thought the texts were coherent and fun to read, we also learned that the former semantic model performed, not by a factor of magnitude, better than the latter.

  • 1060.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Preparation and Characterization of UV-cured Nano Reinforced Biobased Coatings2011Conference paper (Other academic)
    Abstract [en]

    Polymers are typically produced from crude oil which is a non-renewable resource. With the fast depletion of the petroleum resources, the development of materials based on renewable resources is becoming important. Polymers prepared from renewable resources are under development, but has mainly focused on thermoplastic polymers such as polylactic acid. For some applications, such as composites and coatings, thermoset polymers are often preferred. Consequently, it is important to develop thermoset resins from renewable resources as well. Plant oils, such as soybean oil and linseed oil, have been utilized by mankind for a long time. Soybean oil is produced in large quantities and soybean oil is an excellent starting material for the synthesis of thermoset resins. A possible strategy to prepare thermoset resins from plant oils is to introduce pendant methacrylate groups in the structure. Thus, the resins can be cured by a free radical polymerization. Such a resin is very susceptible to photopolymerization when exposed to ultraviolet (UV) radiation, which is a common technique to cure coatings. In the present study, three different thermoset resins were studied. Two of the resins were based on soybean oil while the third resin was based on lactic acid. The latter resin was prepared by a direct condensation of lactic acid and pentaerythritol and was finally end-capped with methacrylate groups. Several authors have studied the addition of nano-reinforcements to thermoset resins. One of the most promising nano-reinforcements is layered silicate which has shown to improve several properties. Layered silicate has been used to reinforce conventional resins with good results. The addition of layered silicates to the biobased resins can be used to improve the properties and to broaden the applications. The resins used in this study were therefore reinforced with layered silicate and UV-cured. The cured resins were characterized by Soxhlet extraction, photo-FTIR, DMTA and tensile tests which will be presented during the presentation.

  • 1061.
    Åkesson, Dan
    University of Borås, School of Engineering.
    Renewable composites prepared from biobased thermoset resins2009Doctoral thesis, monograph (Other academic)
    Abstract [en]

    In our efforts to create a more sustainable society, several researchers have tried to prepare composites from renewable materials in recent years. The use of natural fibres for reinforcement of composites has been relatively well studied. To date, most studies of natural fibre-reinforced composites have either involved the use of conventional thermoset resins or thermoplastic biopolymers. While there are currently several thermoplastic polymers on the market that are produced from renewable resources, thermosets are inevitably produced from petroleum resources. The development of biobased thermoset resins is therefore of considerable importance. Such resins could be used in future for composite applications, for coating applications or in adhesives. This thesis describes the development of biobased thermoset resins for composite applications. Thermoset resins were synthesised from both epoxidised soybean oils as well as from lactic acid. These resins have been characterised neat as well as together with various reinforcements. The main objective has been to study these biobased resins together with natural fibres for reinforcement, though to some extent nano-reinforcements and glass fibres have also been used as reinforcements. Natural fibre-reinforced composites were prepared from several different biobased thermoset resins. Resins based on soybean oil as well as a resin based on lactic acid were evaluated. The soybean resins were prepared by introducing acrylate or methacrylate groups into the molecules of soybean oil. The second type of thermoset resin used was based on lactic acid. This resin consists of star-shaped methacrylated oligomers of lactic acid. Natural fibres were impregnated by several impregnation techniques. Composites were prepared from the biobased resins together with various natural fibres, such as flax and hemp fibres. The resulting composites were evaluated by tensile testing, flexural testing, impact testing, DMTA and SEM. The results show that composites prepared from biobased resin have relatively good mechanical properties and can be used for indoor applications such as furniture and construction elements.

  • 1062.
    Åkesson, Dan
    et al.
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Mechanical recycling of polylactic acid reinforced with cellulose fibres2014Conference paper (Refereed)
    Abstract [en]

    The increased environmental awareness has drawn researchers’ attention to bio-based polymers and several polymers such as polylactic acid (PLA), Mater-bi and polyhydroxyalkanoates (PHA) have been studied extensively. It is not easy to replace conventional petro-based polymers and it is therefore likely that both petro- and bio-based polymers will coexists for a long time. The usage of bio-based polymers is however growing and this may have implications for the plastic recycling industry. The recycling of petro-based polymers is relatively well studied and, where it is cost effective, conventional, petro-based polymers are being recycled in the industry. However, the recycling of bio-based plastics and composites needs to be studied more in detail. While several bio-based polymers can be biologically degraded, it is of interest to study the mechanical recycling of these polymers. In order to minimize the energy usage and the consumption of renewable materials mechanical recycling can be a good option. PLA is an attractive polymer as it is both biodegradable and prepared from renewable materials. This polymer has received a lot of attention and several reviews have been written. Research has shown that neat PLA can be reprocessed several times without significant loss of mechanical properties. Biocomposites based on PLA reinforced with natural fibres have been studied extensively in the literature and there can be many industrial applications of these biocomposites, such as automotive components and materials for construction applications. However, the mechanical recycling of biocomposites is not well studied. Most studies in the literature concerns the recycling of polymers reinforced with wood flour. DuraPulp is a commercial quality consisting PLA fibres mixed with cellulose fibres. This biocomposite material can be processed with for example compression moulding. Adding cellulose fibres to the polymer matrix may significantly change how the material can be recycled. The purpose of this study was to study the mechanical recycling of this material. Sheets were first prepared from Durapulp. The sheets were then compression moulded, grinded and reprocessed again with compression moulding. The mechanical and thermal properties were characterized after each cycle. The feasibility to recycle Durapulp mechanically will be discussed.

  • 1063.
    Åkesson, Dan
    et al.
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Thermoset composites based on polylactic acid2008Conference paper (Refereed)
  • 1064.
    Åkesson, Dan
    et al.
    University of Borås, School of Engineering.
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Hagström, Bengt
    Walkenström, Pernilla
    University of Borås, Swedish School of Textiles.
    Seppälä, Jukka
    Processing of Structural Composites from Biobased Thermoset Resins and Natural Fibres by Compression Moulding2008In: Journal of Biobased Materials and Bioenergy, ISSN 1556-6560, E-ISSN 1556-6579, Vol. 3, no 3, p. 215-225Article in journal (Refereed)
    Abstract [en]

    With the aim of producing composites from renewable materials for the furniture industry, a number of thermoset prepregs were manufactured and evaluated. The applicability of two different biobased thermoset resins was evaluated. The first resin is based on soybean oil and the second on lactic acid. Both resins are cross-linkable and produced from renewable resources. Prepregs were manufactured from the two resins together with natural fibres (flax and cellulose). Furthermore, sheet moulding compound (SMC) was developed from lactic acid based resin together with glass fibre. Seat shells were produced from the prepregs by compression moulding. Curing of the composites was monitored using a response surface methodology. Further, the fibre ratio, mechanical properties as well as adhesion between the matrix and the fibre were evaluated. These prepregs offers short cycle times and yield products with suitable mechanical properties. Issues related to the preparation and the processing of the prepregs are discussed in the article.

19202122 1051 - 1064 of 1064
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