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  • 20501.
    Ågårdh, Lennart
    SP – Sveriges Provnings- och Forskningsinstitut.
    5th Meeting of the European Laboratories Modal Analysis Group in Porto1995Report (Refereed)
  • 20502.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Ansökningar om forskningsbidrag för Mätning och analys av dynamisk respons i armerade betongstrukturer samt FE-modellering och uppdatering av modellen ur mätresultaten1990Report (Refereed)
  • 20503.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Impact excitation: seminar at EMPA, March 19911991Report (Refereed)
  • 20504.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Kvalitetssäkring inom byggområdet1986Report (Refereed)
  • 20505.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Kvalitetssäkring inom byggområdet - en början utan slut!1987Report (Refereed)
  • 20506.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Kvalitetssäkring inom byggområdet - talar vi samma språk? Föredrag vid sektionsmöte i SKF-BYGG den 5 oktober 19871987Report (Refereed)
  • 20507.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Kvalitetssäkring inom byggområdet: föredrag vid Byggentreprenö- rernas kvalitetsdag -871987Report (Refereed)
  • 20508.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Kvalitetsteknik i byggprocessen: inledande föredrag vid SPs informationsdagar, Borås 880202-031988Report (Refereed)
  • 20509.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modal analyses of concrete bridges at "Stora Höga"1990Report (Refereed)
  • 20510.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modal analysis of a prestressed concrete bridge at Stora Höga. (Summary of SP Report 1990: 09(1990Report (Refereed)
  • 20511.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modanalys av betongbro P859 över riksväg 40: mätresultat och analyser1991Report (Refereed)
  • 20512.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modanalys av betongbro över riksväg 40: preliminär analys1991Report (Refereed)
  • 20513.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modanalys av förspänd betongbro i Stora Höga. Metod för detektering av skador.1990Report (Refereed)
  • 20514.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modanalys av slakarmerad betongbro i Stora Höga1990Report (Refereed)
  • 20515.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modelling soft impacts for vibrational excitation of civil engineering structures.1993Report (Refereed)
  • 20516.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modelling soft impacts for vibrational excitation of civil engineering structures1992Report (Refereed)
  • 20517.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Nationell audit för storheten kraft under 19901990Report (Refereed)
  • 20518.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Oförstörande provningsmetoder för betongkonstruktioner. Rapport från en studieresa i Canada och USA.1994Report (Refereed)
  • 20519.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Sliprar av förspänd betong: bestämning av resonansfrekvenser, moddämpningar och modformer med experimentell modanalys1990Report (Refereed)
  • 20520.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Sliprar av förspänd betong: förändringar i resonansfrekvenser och dämpningar orsakade av överlast1990Report (Refereed)
  • 20521.
    Ågårdh, Lennart
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Tillståndsanalys av strukturer och kvalitetskontroll av produkter genom mätning och analysering av dynamisk respons1990Report (Refereed)
  • 20522.
    Ågårdh, Lennart
    SP – Sveriges Provnings- och Forskningsinstitut.
    Tillståndsbedömning av betongbroar genom mätning och beräkning av dynamisk respons1995Report (Refereed)
  • 20523.
    Ågårdh, Lennart
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Palm, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Modal analysis of a high-way concrete bridge , excited with impact1992Report (Refereed)
  • 20524.
    Ågårdh, Lennart
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Selin, R
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Updating a FE-model based on result from experimental modal analysis of a highway concrete bridge. (Äv. 2. ed.)1992Report (Refereed)
  • 20525.
    Ågårdh, Lennart Under utarbetande
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Beräkning av bärförmåga i bågbro av stål över Hammardalsundet1993Report (Refereed)
  • 20526. Åhman, F
    et al.
    Tromborg, B
    Mörk, J
    Aurelius, A
    Djupsjöbacka, A
    RISE, Swedish ICT, Acreo.
    Berntson, A
    RISE, Swedish ICT, Acreo.
    Measurements Simulation of nonlinear Noise in an SOA2005In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 17, no 1, p. 16-18Article in journal (Refereed)
  • 20527. Åhman, Fredrik
    et al.
    Waern, Annika
    RISE, Swedish ICT, SICS.
    Modelling the interests of a news service user2001In: Proceedings of the 8th International Conference on User Modeling 2001, 13-17 July 2001, Sonthofen, Germany, 2001, 1Conference paper (Refereed)
    Abstract [en]

    We have developed a filtering service for an on-line news channel. In this domain, both content-based and collaborative filtering proved difficult to apply. Our solution was make extensive use of user involvement. In particular, we use the information gathered when users send tips about news articles to their friends. The paper describes the types of user involvement that our system allows, the techniques used for user modelling, and how these are used to generate relevant user-adaptive behaviour.

  • 20528. Åisjöen, F
    et al.
    Schneiderman, JF
    Astalan, AP
    Kalabukhov, A
    Johansson, C
    RISE, Swedish ICT, Acreo.
    Winkler, D
    A new approach for bioassays based on frequency€“ time-domain measurements of magnetic nanoparticles2010In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 25, p. 1008-13Article in journal (Refereed)
  • 20529. Åisjöen, F
    et al.
    Schneiderman, JF
    Astalan, AP
    Kalabukhov, A
    Johansson, C
    RISE, Swedish ICT, Acreo.
    Winkler, D
    The need for stable, mono-dispersed, biofunctional magnetic nanoparticles for one-step immunoassays2010In: Journal of Physics, Vol. 200Article in journal (Refereed)
  • 20530. Åisjöen, F
    et al.
    Schneiderman, JF
    Zaborowska, M
    Shunmugavel, K
    Magnelind, P
    Kalabukhov, A
    Petersson, K
    Prieto Astalan, A
    Johansson, C
    RISE, Swedish ICT, Acreo.
    Winkler, D
    Fast sensitive measurement of specific antigen-antibody binding reactions with magnetic nanoparticles HTS SQUID2009In: IEEE Transactions on Applied Superconductivity., Vol. 19, no 3, p. 848-52Article in journal (Refereed)
  • 20531.
    Åkerfeldt, M.
    et al.
    University of Borås.
    Strååt, Martin
    RISE, Swerea, Swerea IVF.
    Walkenström, Pernilla
    RISE, Swerea, Swerea IVF.
    Electrically conductive textile coating with a PEDOT-PSS dispersion and a polyurethane binder2013In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 83, no 6, p. 618-627Article in journal (Refereed)
    Abstract [en]

    Electrically conductive textile coatings have been prepared by the addition of a dispersion of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT-PSS) and ethylene glycol to a polyurethane-based coating formulation. The formulations were designed to have similar viscosities, measured with a rheometer using a cone-and-plate set-up. The formulations were applied to woven poly(ethylene) terephthalate substrates using a direct coating method. The concentration PEDOT-PSS in the finished coatings varied between 0.7 and 6.2 wt%, the coating deposit between 19 and 155 g/m2 and the drying procedure between 4 hours at 20°C and 10 minutes at 150°C. Surface resistivity was measured with a ring probe and surface topology was addressed with scanning electron microscopy (SEM). The PEDOT-PSS concentration had a large effect on the resistivity, which dropped by five orders of magnitude with an increased concentration. The steepest decrease occurred between 1 and 3 wt% PEDOT-PSS, indicating a percolation threshold. An increased coating deposit resulted in a resistivity drop by a factor 10, but no significant effect on the resistivity of the samples could be ascertained by variation of the drying conditions when samples had been subjected to subsequent annealing. © The Author(s) 2013.

  • 20532.
    Åkerfeldt, M.
    et al.
    University of Borås.
    Strååt, Martin
    RISE, Swerea, Swerea IVF.
    Walkenström, Pernilla
    RISE, Swerea, Swerea IVF.
    Influence of coating parameters on textile and electrical properties of a poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate)/polyurethane-coated textile2013In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 83, no 20, p. 2164-2176Article in journal (Refereed)
    Abstract [en]

    Textile coatings with electrical conductivity were obtained by the addition of poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) and ethylene glycol (EG) to a polyurethane (PU)-based coating formulation. Variations of the coating formulation, the coating amount and the drying conditions, as well as the absence of an annealing step, were investigated. The coated fabrics were evaluated for tear strength and bending rigidity as well as surface resistivity and appearance before and after Martindale abrasion. A high proportion of PEDOT:PSS dispersion in the formulation and the presence of EG provided low surface resistivity. This composition resulted in softer samples with higher tear strength than those containing more PU-binder. All coatings proved to withstand abrasion to a similar extent. The surface resistivity increased gradually with the abrasion, about one half order of magnitude, except for those coatings that had been subjected to a faster drying process, where the surface resistivity increased somewhat faster. © The Author(s) 2013.

  • 20533.
    Åkerfeldt, Maria
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF. University of Borås, Sweden.
    Lund, Anja
    University of Borås, Sweden.
    Walkenström, Pernilla
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Textile sensing glove with piezoelectric PVDF fibers and printed electrodes of PEDOT:PSS2015In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 85, no 17, p. 1789-1799Article in journal (Refereed)
    Abstract [en]

    The development of an entirely polymer-based motion sensing glove with possible applications, for example, in physical rehabilitation is described. The importance of comfort for the wearer and the possibility to clean the glove in normal laundering processes were important aspects in the development. The glove is all textile and manufactured using materials and methods suitable for standard textile industry processes. For the first time, melt-spun piezoelectric poly(vinylidene fluoride) (PVDF) fibers with conductive cores were machine embroidered onto a textile glove to function as a sensor element. Electrodes and electrical interconnections were constituted by a screen printed conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) formulation. The screen printing of the interconnections was shown to be a reliable method for reproducible material deposition, resulting in an average surface resistivity value of 57 Ω/square. A repeated strain of 10% only influenced the resistance of the interconnections initially and to a very limited extent. The influence of washing on the electrical resistance of the printed interconnections was also studied; after 15 wash cycles the average surface resistivity was still below 500 Ω/square, which was deemed sufficient for the polymeric sensor system to remain functional during long-term use. Sensor data from the glove was also successfully used as input to a microcontroller running a robot gripper, in order to demonstrate its potential applications.

  • 20534.
    Åkerfeldt, Maria
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF. University of Borås.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF. Chalmers University of Technology.
    Gillgard, Philip
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Walkenström, Pernilla
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Textile piezoelectric sensors – melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) coating as the outer electrode2014In: Fashion and Textiles, ISSN 2198-0802, Vol. 1, no 13Article in journal (Refereed)
    Abstract [en]

    The work presented here addresses the outer electroding of a fully textile piezoelectric strain sensor, consisting of bi-component fibre yarns of β-crystalline poly(vinylidene fluoride) (PVDF) sheath and conductive high density polyethylene (HDPE)/carbon black (CB) core as insertions in a woven textile, with conductive poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) coatings developed for textile applications. Two coatings, one with a polyurethane binder and one without, were compared for the application and evaluated as electrode material in piezoelectric testing, as well as tested for surface resistivity, tear strength, abrasion resistance and shear flexing. Both coatings served their function as the outer electrodes in the system and no difference in this regard was detected between them. Omission of the binder resulted in a surface resistivity one order of magnitude less, of 12.3 Ω/square, but the surface resistivity of these samples increased more upon abrasion than the samples coated with binder. The tear strength of the textile coated with binder decreased with one third compared to the uncoated substrate, whereas the tear strength of the coated textile without binder increased with the same amount. Surface resistivity measurements and scanning electron microscopy (SEM) images of the samples subjected to shear flexing showed that the coatings without the binder did not withstand this treatment, and that the samples with the binder managed this to a greater extent. In summary, both of the PEDOT:PSS coatings could be used as outer electrodes of the piezoelectric fibres, but inclusion of binder was found necessary for the durability of the coating.

  • 20535.
    Åkerfeldt, Maria
    et al.
    Högskolan i Borås, Institutionen Textilhögskolan..
    Strååt, Martin
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    A rheology study of a textile coating paste containing PEDOT:PSS2011In: Papers presented at the nordic rheology conference, 2011, p. 269-273Conference paper (Other academic)
  • 20536.
    Åkermo, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Avveckling av energiskog på åkermark1990Report (Refereed)
  • 20537.
    Åkermo, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Mekanisk och termisk blastdödning i potatis1989Report (Refereed)
  • 20538.
    Åkesson, D.
    et al.
    University College of Borås.
    Skrifvars, M.
    University College of Borås.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Walkenström, Pernilla
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Seppälä, J.
    Helsinki University of Technology.
    Processing of structural composites from biobased thermoset resins and natural fibres by compression moulding2009In: 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. Copyright © 2009 American Scientific Publishers.

  • 20539.
    Åkesson, Karl-Petter
    et al.
    RISE, Swedish ICT, SICS. ICE.
    Bullock, Adrian
    Rodden, Tom
    A toolkit for user re-configuration of ubiquitous domestic environments2002Conference paper (Refereed)
    Abstract [en]

    This paper describes a distributed system with the aim to allow inhabitants to re-configure arrangements of devices and to understand the behaviour of these devices in tandem by making visible the various configurations. The purpose is to address the evolutionary nature of the domestic environments. We describe two different configuration facilities and the underlying infrastructure.

  • 20540.
    Åkesson, Karl-Petter
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ljungberg, Fredrik
    Coupling real and virtual environments1998Conference paper (Refereed)
  • 20541.
    Åkesson, Karl-Petter
    et al.
    RISE, Swedish ICT, SICS. ICE.
    Nilsson, Andreas
    Designing Leisure Applications for the Mundane Car-Commute.2002In: Personal and Ubiquitous Computing, ISSN 1617-4909, E-ISSN 1617-4917, Vol. 6, p. 176-187Article in journal (Refereed)
    Abstract [en]

    Commuting by car from home to work can be very time consuming. We have conducted a study to explore what people are doing, and want to do, while commuting. People use their time in the car on a wide variety of activities with great innovation. There was no unanimous activity that everyone wanted, rather a wide variety of activities were requested. Three different categories of activity were identified which we refer to as mundane, vocational and traffic related. To demonstrate a possible IT service supporting commuters, a prototype based on speech output and a simple input mechanism from a wheel was developed. This service moves sampling of music from the conventional shop into the car. The prototype was informally tested with users, which resulted in a number of improvements. Preliminary user results indicate good functionality, a comprehensive interaction interface.

  • 20542.
    Åkesson, Karl-Petter
    et al.
    RISE, Swedish ICT, SICS. ICE.
    Simsarian, Kristian
    RISE, Swedish ICT, SICS. ICE.
    Reality Portals1999Conference paper (Refereed)
    Abstract [en]

    Through interactive augmented virtuality we provide the ability to interactively explore a remote space inside a virtual environment. This paper presents a tool and technique that can be used to create such virtual worlds that are augmented by video textures taken of real world objects. The system constructs and updates, in near real-time, a representation of the user-defined salient and relevant features of the real world. This technique has the advantage of constructing a virtual world that contains the relevant video-data of the real world, while maintaining the flexibility of a virtual world. The virtual-real world representation is not dependent on physical location and can be manipulated in a way not subject to the temporal, spatial, and physical constraints found in the real world. Another advantage is that spatializing the video-data may afford more intuitive examination.

  • 20543.
    Åkesson, Urban
    Brandteknik, material (BRm).
    Characterisation of microcracks in the Bohus granite, western Sweden, caused by uniaxial cyclic loading.2004In: Engineering Geology, Vol. 72, no 1&2, p. 131-142Article in journal (Refereed)
  • 20544.
    Åkesson, Urban
    Brandteknik, material (BRm).
    Image analysis - a method to determine the mechanical properties of granites2001In: Proceedings of the 8th Euroseminar on Microscopy Applied to Buildings Materials, 2001, , p. 497-502Conference paper (Other academic)
  • 20545.
    Åkesson, Urban
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik. University of Gothenburg .
    Numerical description of rock texture by using image analysis and quantitative microscopy: alternative method for the assessment of the mechanical properties of rock aggregates2001Licentiate thesis, monograph (Other academic)
  • 20546.
    Åkesson, Urban
    Brandteknik, material (BRm).
    Relationship between microstructure and the bowing properties of calcite marble.2006In: Bulletin of Engineering Geology and the Environment, Vol. 65, no 1, p. 73-79Article in journal (Refereed)
  • 20547.
    Åkesson, Urban
    Brandteknik, material (BRm).
    Relationship between texture and mechanical properties of granites, central Sweden, by the use of image analysis techniques2001In: Bulletin of Engineering Geology and the Environment, Vol. 60, p. 277-284Article in journal (Other academic)
  • 20548.
    Åkesson, Urban
    Brandteknik, material (BRm).
    The influence of foliation on the fragility of granitic rocks, image analysis and quantitative microscopy.2003In: Engineering Geology, Vol. 68, p. 275-288Article in journal (Other academic)
  • 20549.
    Åkesson, Urban
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Döse, Magnus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Olika stenmaterials inverkan på partikelmängd från dubbdäckslitage2010In: CBI-nytt, ISSN 0349-2060, no 1, p. 2-3Article in journal (Other academic)
  • 20550.
    Åkesson, Urban
    et al.
    Brandteknik, material (BRm).
    Lindqvist, Jan-Erik
    Brandteknik, material (BRm).
    Geometric Characterisation of crushed fine Aggregates by use of Image Analysis Nordtest project No 040262006Report (Refereed)
    Abstract [en]

    Crushed rock becomes more and more common as aggregate in concrete, due to the restriction to use natural gravel. Today crushed aggregate is commonly used from the size of 8 mm and upwards. Natural gravel is still used for the finer gradings. The problem with using crushed aggregate for the finer fractions is that the material is often too flaky and elongated, especially in the 0-2 mm fraction. In order to use crushed aggregate in all fractions in concrete it is important to have more knowledge about the rock material, crushing techniques and the influence on rheology of the concrete. In this project, a method has been developed to describe the geometrical characteristics of crushed fine aggregates. The materials have been sieved into different fractions and sample for analysis have been prepared for three different fractions. The method is based on image analysis where images of the material are taken with scanning electron microscopy and optical microscopy. To geometrically characterise the material, two parameters have been measured, Fmin/Fmax and F-aspect. The results show that this method is quite robust and that there is no significant difference between the two measured parameters.

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