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  • 1.
    Achtel, Christian
    et al.
    Friedrich Schiller University of Jena, Germany.
    Jedvert, Kerstin
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF. Friedrich Schiller University of Jena, Germany.
    Kosan, Birgit
    Thuringian Institute of Textile and Plastics Research (TITK), Germany.
    Seoud, Omar. A.El
    University of São Paulo, Brazil.
    Heinze, Thomas
    Friedrich Schiller University of Jena, Germany.
    Dissolution capacity of novel cellulose solvents based on triethyloctylammonium chloride2017In: Macromolecular Chemistry and Physics, ISSN 1022-1352, E-ISSN 1521-3935, Vol. 218, no 21, article id 1700208Article in journal (Refereed)
    Abstract [en]

    Dissolution of cellulose from various sources (microcrystalline cellulose and different dissolving grade pulp fibers) is investigated in solvent systems based on triethyl(n-octyl)ammonium chloride (N2228Cl). Clear cellulose solutions are obtained with N2228Cl in a variety of solvents, e.g., dimethyl sulfoxide, N,N-dimethylacetamide, and acetone. It is possible to prepare clear cellulose solutions from pulp fibers with concentrations up to 15 wt%. However, it is found that the cellulose is degraded, especially when neat (i.e., molten) N2228Cl is used as a solvent. The present work includes comprehensive rheological characterization of the cellulose solutions, both with shear and extensional rheology. In most cases, the viscosity values are low (complex viscosities below 100 Pa s for 5–10 wt% dissolved cellulose), and the solutions show more Newtonian than viscoelastic behavior. 

  • 2.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Keramer.
    Zirconia in applications with bone contact2016Conference paper (Other academic)
  • 3.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Lyckfeldt, Ola
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Johansson, Emil
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Visible-Light CurableCeramic Suspensions for Additive Manufacturing of Dense Ceramic Parts2016Conference paper (Other academic)
  • 4.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Shen, J.Z.
    Stockholm University.
    Defect Minimization in Prosthetic Ceramics2014In: Advanced Ceramics for Dentistry, Elsevier Inc. , 2014, p. 359-373Chapter in book (Refereed)
    Abstract [en]

    The mechanical reliability and aesthetic appearance of ceramic dental prostheses are strongly influenced by the presence of defects. When several processes are used during fabrication of ceramic dental prostheses, additional defects are unavoidably introduced in each process step; these are in addition to the ones that already exist in raw materials. To avoid the degeneration of material performance by the accumulated defect population, process optimization is needed to minimize the defects introduced. Standardized mechanical evaluations are usually performed on samples with carefully prepared surfaces in order to minimize the influence from the defects usually induced by fabrication processes. The results from such mechanical evaluation indicate the strength level that is achievable by the material with the given population of bulk defects. In order to avoid a reduction in the performance of the ceramic material by the additional defects normally induced by the fabrication process, it must be understood how these defects are introduced, and solutions must be found to reduce their size and frequency through modifications of the material and processes. The aim of this chapter is to elucidate the sources of defects that are common for ceramic dental prostheses and to determine how to minimize them. © 2014 Elsevier Inc. All rights reserved.

  • 5.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Shen, Z.
    Stockholm University.
    Effects of granule density on strength and granule related defects in zirconia2012In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 32, no 11, p. 2653-2659Article in journal (Refereed)
    Abstract [en]

    A suspension of zirconia powder (TZ3YSE) with a solids loading of 50. vol% was prepared by ball milling. Binders were added and some of the suspension was diluted to 40, 30 and 20. vol% before freeze granulation was performed. A spray dried material (TZ3YSEB) was used as a reference. The pore size distribution of the different granules was evaluated and from the microstructure it was shown that inhomogeneities were present in both the freeze granulated as well as in the spray dried granules. In addition, the density, microstructure as well as the strength of sintered materials prepared from the granules were studied. The results showed that a high green density or sintered density was not sufficient in order to achieve a high strength material. It was further shown that the strength was significantly influenced by the granule density and not by the inhomogeneities found in the granules. © 2012.

  • 6.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Tönnäng, Lenny
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    The effect of softmachining parameters on the mechanical strength of zirconia2015Conference paper (Other academic)
  • 7.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Venturini, Francesca
    ZHAW School of Engineering.
    Schönherr, Veit
    ZHAW School of Engineering .
    Rey, Julien
    ZHAW School of Engineering.
    Characterization oflight-gas interaction in strongly-scattering nanoporous materials and itsimplications for tunable diode laser absorption spectroscopy2016Conference paper (Other academic)
  • 8.
    Aitomäki, Y.
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Långström, R.
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Fernberg, P.
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Novel reactive bicomponent fibres: Material in composite manufacturing2012In: Journal of Nanostructured Polymers and Nanocomposites, ISSN 17904439, Vol. 8, no 1, p. 11-majArticle in journal (Refereed)
    Abstract [en]

    The hypotheses that reactive uncured, thermoset bicomponent fibres can be prepared and mixed with reinforcing fibres and ultimately used in preparation of a composite was tested and is described. It is thought that such fibres have the two potential advantages: (1) to enable manufacturing with particle doped resins e.g. nanocomposites which add functionality to composites and (2) increased efficiency of structural composite manufacturing by increasing the level of automation. The structure of the thermoset fibres comprises of a sheath of thermoplastic and a core of uncured thermoset resin. Once manufactured, the fibres were wound with a reinforced fibre onto a plate, consolidated and cured. The resulting composite was examined and compared to other composites made with the same manufacturing method from commercially available materials. The results show that a laminate can be produced using these reactive bicomponent fibres. The resin system successfully impregnates the reinforcing carbon fibres and that the thermoplastic separates from the epoxy resin system during consolidation. In comparison to reference material, the bicomponent laminate shows promising characteristics. However, the processes developed are currently on a lab-scale and considerable improvement of various bicomponent fibre properties, such as the strength, are required before the technology can be used on a larger scale.

  • 9.
    Aitomäki, Yvonne
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Hagström, Bengt
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Långström, Runar
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Fernberg, Patrik
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Novel reactive bicomponent fibres: Material in composite manufacturing2012In: Journal of Nanostructured Polymers and Nanocomposites, ISSN 17904439, Vol. 8, no 1, p. s.5-11Article in journal (Refereed)
    Abstract [en]

    The hypotheses that reactive uncured, thermoset bicomponent fibres can be prepared and mixed with reinforcing fibres and ultimately used in preparation of a composite was tested and is described. It is thought that such fibres have the two potential advantages: (1) to enable manufacturing with particle doped resins e.g. nanocomposites which add functionality to composites and (2) increased efficiency of structural composite manufacturing by increasing the level of automation. The structure of the thermoset fibres comprises of a sheath of thermoplastic and a core of uncured thermoset resin. Once manufactured, the fibres were wound with a reinforced fibre onto a plate, consolidated and cured. The resulting composite was examined and compared to other composites made with the same manufacturing method from commercially available materials. The results show that a laminate can be produced using these reactive bicomponent fibres. The resin system successfully impregnates the reinforcing carbon fibres and that the thermoplastic separates from the epoxy resin system during consolidation. In comparison to reference material, the bicomponent laminate shows promising characteristics. However, the processes developed are currently on a lab-scale and considerable improvement of various bicomponent fibre properties, such as the strength, are required before the technology can be used on a larger scale.

  • 10.
    Akesson, D.
    et al.
    University of Borås.
    Skrifvars, M.
    University of Borås.
    Walkenström, Pernilla
    RISE, Swerea, Swerea IVF.
    Preparation of thermoset composites from natural fibres and acrylate modified soybean oil resins2009In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 114, no 4, p. 2502-2508Article in journal (Refereed)
    Abstract [en]

    Structural composites with a high content of renewable material were produced from natural fibres and an acrylated epoxidized soybean oil resin. Composites were prepared by spray impregnation followed by compression moulding at elevated temperature. The resulting composites had good mechanical properties in terms of tensile strength and flexural strength. Tensile testing as well as dynamical mechanical thermal analysis showed that increasing the fibre content, increased the mechanical properties. The resin can be reinforced with up to 70 wt % fibre without sacrifice in processability. The tensile modulus ranged between 5.8 and 9.7 GPa depending on the type of fibre mat. The study of the adhesion by low vacuum scanning electron microscopy shows that the fibres are well impregnated in the matrix. The aging properties were finally evaluated. This study shows that composites with a very high content of renewable constituents can be produced from soy bean oil resins and natural fibres. © 2009 Wiley Periodicals, Inc.

  • 11.
    Albinsson, Ola
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Lundevall, Åsa
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Sehati, Parisa
    Linköpings universitet.
    Stålhanske, Christina
    RISE.
    Sundberg, P
    Mattsson, Lards-Göran
    KTH Royal Institute of Technology .
    Sjövall, Peter
    Rise.
    The influence of surface composition and plasma treatment on adhesion2015In: Proceedings of GPD Glass Performance Days 2015, 2015, p. 11-14Conference paper (Other academic)
  • 12.
    Altmann, Brigitte
    et al.
    University of Freiburg, Germany.
    Karygianni, Lamprini
    University of Freiburg, Germany.
    Al-Ahmad, Ali
    University of Freiburg, Germany.
    Butz, Frank
    University of Freiburg, Germany.
    Bächle, Maria
    University of Freiburg, Germany.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Fürderer, Tobias
    Courtois, Nicolas
    Palmero, Paola
    Politecnico di Torino, Italy.
    Follo, Marie
    University of Freiburg, Germany.
    Chevalier, Jérôme
    Université de Lyon, France.
    Steinberg, Thorsten
    University of Freiburg, Germany.
    Kohal, Ralf Joachim
    University of Freiburg, Germany.
    Assessment of Novel Long-Lasting Ceria-Stabilized Zirconia-Based Ceramics with Different Surface Topographies as Implant Materials2017In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 27, no 40, article id 1702512Article in journal (Refereed)
    Abstract [en]

    The development of long-lasting zirconia-based ceramics for implants, which are not prone to hydrothermal aging, is not satisfactorily solved. Therefore, this study is conceived as an overall evaluation screening of novel ceria-stabilized zirconia-alumina-aluminate composite ceramics (ZA8Sr8-Ce11) with different surface topographies for use in clinical applications. Ceria-stabilized zirconia is chosen as the matrix for the composite material, due to its lower susceptibility to aging than yttria-stabilized zirconia (3Y-TZP). This assessment is carried out on three preclinical investigation levels, indicating an overall biocompatibility of ceria-stabilized zirconia-based ceramics, both in vitro and in vivo. Long-term attachment and mineralized extracellular matrix (ECM) deposition of primary osteoblasts are the most distinct on porous ZA8Sr8-Ce11p surfaces, while ECM attachment on 3Y-TZP and ZA8Sr8-Ce11 with compact surface texture is poor. In this regard, the animal study confirms the porous ZA8Sr8-Ce11p to be the most favorable material, showing the highest bone-to-implant contact values and implant stability post implantation in comparison with control groups. Moreover, the microbiological evaluation reveals no favoritism of biofilm formation on the porous ZA8Sr8-Ce11p when compared to a smooth control surface. Hence, together with the in vitro in vivo assessment analogy, the promising clinical potential of this novel ZA8Sr8-Ce11 as an implant material is demonstrated. 

  • 13.
    Altmann, Brigitte
    et al.
    University Medical Center Freiburg, Freiburg, Germany ; .
    Rabel, Kerstin
    University Medical Center Freiburg, Freiburg, Germany ; .
    Kohal, Ralf J.
    University Medical Center Freiburg, Freiburg, Germany.
    Proksch, Susanne
    University Medical Center Freiburg, Freiburg, Germany.
    Tomakidi, Pascal
    University Medical Center Freiburg, Freiburg, Germany.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Bernsmann, Falk
    NTTF Coatings GmbH, Rheinbreitbach, Germany.
    Palmero, Paola
    INSTM R.U. PoliTO, LINCE Lab., Politecnico di Torino, Torino, Italy.
    Fürderer, Tobias
    MOESCHTER GROUP Holding GmbH & Co. KG, Dortmund, Germany.
    Steinberg, Thorsten
    University Medical Center Freiburg, Freiburg, Germany.
    Cellular transcriptional response to zirconia-based implant materials2017In: Dental Materials, ISSN 0109-5641, E-ISSN 1879-0097, Vol. 33, no 2, p. 241-255Article in journal (Refereed)
    Abstract [en]

    Objective To adequately address clinically important issues such as osseointegration and soft tissue integration, we screened for the direct biological cell response by culturing human osteoblasts and gingival fibroblasts on novel zirconia-based dental implant biomaterials and subjecting them to transcriptional analysis. Methods Biomaterials used for osteoblasts involved micro-roughened surfaces made of a new type of ceria-stabilized zirconia composite with two different topographies, zirconium dioxide, and yttria-stabilized zirconia (control). For fibroblasts smooth ceria- and yttria-stabilized zirconia surface were used. The expression of 90 issue-relevant genes was determined on mRNA transcription level by real-time PCR Array technology after growth periods of 1 and 7 days. Results Generally, modulation of gene transcription exhibited a dual dependence, first by time and second by the biomaterial, whereas biomaterial-triggered changes were predominantly caused by the biomaterials’ chemistry rather than surface topography. Per se, modulated genes assigned to regenerative tissue processes such as fracture healing and wound healing and in detail included colony stimulating factors (CSF2 and CSF3), growth factors, which regulate bone matrix properties (e.g. BMP3 and TGFB1), osteogenic BMPs (BMP2/4/6/7) and transcription factors (RUNX2 and SP7), matrix collagens and osteocalcin, laminins as well as integrin ß1 and MMP-2. Significance With respect to the biomaterials under study, the screening showed that a new zirconia-based composite stabilized with ceria may be promising to provide clinically desired periodontal tissue integration. Moreover, by detecting biomarkers modulated in a time- and/or biomaterial-dependent manner, we identified candidate genes for the targeted analysis of cell-implant bioresponse during biomaterial research and development.

  • 14.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Brinkfeldt, Klas
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Simulations and Fabrication of a SiC-Based Power Module with Double SidedCooling: in Proceedings of the IMAPS Nordic Annual Conference 20152015Conference paper (Other academic)
  • 15.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Brinkfeldt, Klas
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Nord, S.
    Volvo Group Trucks Technology.
    Ottosson, J.
    Volvo Group Trucks Technology.
    Lampic, G.
    Elaphe Propulsion Technologies Ltd.
    Gotovac, G.
    Elaphe Propulsion Technologies Ltd.
    Zschieschang, O.
    Fairchild Semiconductor GmbH.
    Baumgartel, H.
    Hella Fahrzeugkomponenten GmbH.
    Brusius, M.
    Sensitec GmbH.
    Kaulfersch, E.
    Berliner Nanotest und Design GmbH.
    Hilpert, F.
    Fraunhofer IISB.
    Otto, A.
    Fraunhofer ENAS.
    Frankeser, S.
    Technische Universität Chemnitz.
    COSIVU - Compact, smart and reliable drive unit for fully electric vehicles2016In: 2016 Pan Pacific Microelectronics Symposium, Pan Pacific 2016Article in journal (Refereed)
    Abstract [en]

    COSIVU is a three year collaborative research project that ended in September 2015 and which has been funded within the European Green Car Initiative (now the European Green Vehicle Initiative). COSIVU addresses one of the most critical technical parts in fully electrical vehicles (FEV) besides the energy storage system: the mechatronic drive-train unit. The COSIVU project has delivered a new system architecture for multiple wheel drive-trains by a smart, compact and durable single-wheel drive unit with integrated electric motor, full silicon carbide (SiC) power electronics (switches and diodes), a novel control and health monitoring module with wireless communication, and an advanced ultra-compact cooling solution. DfR utilizing FEM simulations ensures first time right solutions. This paper presents the main results including the architecture of the drive train solution as well as the modular design of the inverter based on Inverter Building Blocks, one per phase. Performance tests are presented here for the first time for both the heavy duty commercial vehicle solution performed in a test rig by Volvo, and the tests of the COSIVU solution adapted to a passenger car done by Elaphe.

  • 16.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Carlström, Elis
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Orlenius, Jessica
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Zackrisson, Mats
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Avellán, Lars
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    LCA as a Strategic Tool for Technology Development – Li Ion Battery Case2013Conference paper (Other academic)
  • 17.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Nilsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Wetter, Göran
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Interconnection of electrically conductive fibersfor application in smart textiles2015Conference paper (Other academic)
  • 18.
    Andersson, Dag
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Weiler, Petra
    VDI/VDE Innovation + Technik GmbH, Germany.
    Mayora, Kepa
    IK4-Ikerlan, Spain.
    Kunze, Michael
    Hahn Schickard, Germany.
    Günzler, Rainer
    Hahn Schickard, Germany.
    Karmann, Stephan
    Hahn Schickard, Germany.
    Steinke, Arndt
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Winzer, Andreas
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Thronicke, Nicole
    CiS Forschungsinstitut für Mikrosensorik GmbH, Germany.
    Vazquez, Patricia
    Tyndall Institute, Ireland.
    Felemban, Shifa
    Tyndall Institute, Ireland.
    Moore, Eric
    Tyndall Institute, Ireland.
    Voirin, Guy
    CSEM SA, Switzerland.
    Scolan, Emmanuel
    CSEM SA, Switzerland.
    Smadja, Rita
    CSEM SA, Switzerland.
    SMARTER-SI - Smart access to manufacturing for Systems Integration2017Conference paper (Refereed)
    Abstract [en]

    The three year EU project SMARTER-SI that started in February 2015 has developed and tested a new production platform for smart systems that offer SMEs and “mid-cap” companies help to manufacture small and medium volumes. The ultimate goal of this project is to test a new concept for small lot production, which we call the Cooperative Foundry Model (CFM). The CFM is tested by combining components or parts of systems (building blocks) already developed by the RTOs involved in the project in so-called Application Experiments (AEs), thereby creating innovative Smart Systems which serve SMEs' product needs. During the first two years, four predefined AEs have been developed that consist of i) a multi-parametric point of care testing (POCT) device, ii) a dew-point measurement system, iii) a CO2 measurement system, and iv) a portable device that can be used to screen water quality.

  • 19. Anderud, J
    et al.
    Abrahamsson, P
    Jimbo, R
    Isaksson, S
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Malmström, J
    Naito, Y
    Wennerberg, A
    Guided bone augmentation using ceramic space-maintaining devices: The impact of chemistry2015In: Clinical, Cosmetic and Investigational Dentistry, ISSN 11791357, Vol. 7, p. 45-53Article in journal (Refereed)
    Abstract [en]

    The purpose of the study was to evaluate histologically, whether vertical bone augmentation can be achieved using a hollow ceramic space maintaining device in a rabbit calvaria model. Furthermore, the chemistry of microporous hydroxyapatite and zirconia were tested to determine which of these two ceramics are most suitable for guided bone generation. 24 hollow domes in two different ceramic materials were placed subperiosteal on rabbit skull bone. The rabbits were sacrificed after 12 weeks and the histology results were analyzed regarding bone-to-material contact and volume of newly formed bone. The results suggest that the effect of the microporous structure of hydroxyapatite seems to facilitate for the bone cells to adhere to the material and that zirconia enhance a slightly larger volume of newly formed bone. In conclusion, the results of the current study demonstrated that ceramic space maintaining devices permits new bone formation and osteoconduction within the dome. © 2015 Anderud et al.

  • 20.
    Anderud, J.
    et al.
    University Malmö.
    Jimbo, R.
    University Malmö.
    Abrahamsson, P.
    Region Halland.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Malmström, J.
    Region Halland.
    Wennerberg, A.
    Malmö University.
    The impact of surface roughness and permeability in hydroxyapatite bone regeneration membranes2015In: Clinical Oral Implants Research, ISSN 0905-7161, E-ISSN 1600-0501Article in journal (Refereed)
    Abstract [en]

    Background: One of the crucial aspects in guided bone regeneration is the space maintenance. This is normally created by a membrane, which should primarily be accepted by the surrounding tissues without causing any adverse reactions. The impact of surface topography, biological acceptance as well as permeability of these membranes has been carefully discussed in the literature. Purpose: The purpose of this study was to evaluate histologically the bone forming properties inside of hollow hydroxyapatite space-maintaining devices with different inner surfaces and different permeabilities in an animal calvaria model in vivo. Materials and methods: A total of 36 hollow domes with three different designs made of hydroxyapatite were surgically attached to the skulls of rabbits. Group 1 had a moderately rough inner surface. Group 2 had a smooth inner surface. Group 3 had the same properties as Group 1 but had macroscopic holes on the top. The domes were left to heal for 12 weeks and were then processed for undecalcified ground sectioning. Histological evaluations were performed using a light microscope and scanning electron microscopy. The bone-implant contact (BIC) percentage along the device was calculated. Results: The median percentage of BIC was higher for Group 1 compared with Group 2 (P = 0.004). Group 1 produced a larger median BIC compared with Group 3 (P < 0.0001). Conclusions: Within the limits of this preclinical study, these findings suggest that a moderately rough inner surface of a ceramic membrane along with a non-permeable device produces more bone than a smooth inner surface. © 2015 John Wiley & Sons A/S.

  • 21.
    Arvidsson, Niklas
    et al.
    RISE - Research Institutes of Sweden.
    Bolin, Lisa
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Lindberg, Siv
    RISE - Research Institutes of Sweden.
    Linder, Marcus
    RISE - Research Institutes of Sweden.
    Mellquist, Ann-Charlotte
    RISE - Research Institutes of Sweden.
    Norefjell, Fredric
    RISE - Research Institutes of Sweden.
    Nyström, Thomas
    RISE - Research Institutes of Sweden.
    Rex, Emma
    RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
    Norrblom, Hans-Lennart
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Tööj, Lars
    Industrial Development Center, IDC.
    Cirkulära möbelflöden: Hur nya affärsmodeller kan bidra till hållbar utveckling inom offentliga möbler2017Report (Other academic)
    Abstract [sv]

    Sverige har en stark möbelindustri och en stolt tradition av att tillverka tidlösa och högkvalitativa möbler, ofta av naturmaterial. 2016 producerade Sverige möbler för 22,8 miljarder SEK, varav kontorsmöbler stod för nästan en fjärdedel1. Det saknas idag statistik över vad som händer med dessa möbler när de inte längre används, men det står klart att många av dem slängs i förtid när verksamheter flyttar eller när deras behov ändras. Samtidigt syns en tydlig utveckling mot att kunder mer och mer efterfrågar återbrukade eller renoverade möbler som en del i sitt hållbarhetsarbete. Denna utveckling var startpunkten för projektet ”Affärsmodell-innovation för cirkulära möbelflöden”.

    Affärsmodellinnovation för cirkulära möbelflöden är ett Vinnovafinansierat projekt som under åren 2015-2017 arbetat med att utveckla och testa koncept för cirkulära affärsmodeller för i första hand offentliga möbler. I projektet har tjugo aktörer från hela värdekedjan, från underleverantörer, möbelproducenter, återförsäljare och användare till forskare och branschorgan, samarbetat kring affärsutveckling, kundincitament, produktdesign, logistik, hållbarhets- och certifieringsfrågor.

    Den här skriften belyser hur nya affärsmodeller för mer cirkulära möbelflöden kan bidra till en mer hållbar utveckling och ger smakprov på slutsatser från projektet. Skriften riktar sig framför allt till producenter och återförsäljare av möbler för offentliga miljöer, men även kunder och inköpare tror vi kan ha stor nytta av skriften. Vi hoppas att den även kan fungera som inspiration för andra industrier och branscher som funderar på en övergång till mer cirkulära affärsekosystem.

  • 22. Bartkowiak, T.
    et al.
    Berglund, Johan
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Brown, C.A.
    Establishing functional correlations between areal curvature and coefficient of friction for machined surfaces2017Conference paper (Other academic)
  • 23.
    Bengtsson, Jenny
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Olson, Carina
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Köhnke, Tobias
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Bialik, Erik
    Lund University, Sweden.
    Elucidating the effect of non-solvents on the TBAAc/DMSO-cellulosesolvent system2017In: Cellulosic material properties and industrial potential: Final meeting in COST FP1205, 2017Conference paper (Other academic)
  • 24.
    Bengtsson, Jenny
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Olsson, Carina
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Hedlund, Artur
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Köhnke, Tobias
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Bialik, Erik
    Molecules in Motion, Sweden.
    Understanding the Inhibiting Effect of Small-Molecule Hydrogen Bond Donors on the Solubility of Cellulose in Tetrabutylammonium Acetate/DMSO2017In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 121, no 50, p. 11241-11248Article in journal (Refereed)
    Abstract [en]

    Certain ionic liquids are powerful cellulose solvents, but tend to be less effective when small-molecule hydrogen bond donors are present. This is generally attributed to competition with cellulose for hydrogen bonding opportunities to the anion of the ionic liquid. We show that the solubility of cellulose in dimethyl sulfoxide solutions of tetrabutylammonium acetate is less strongly affected by water than by ethanol on a molar basis, contrary to what can be expected based on hydrogen bond stoichiometry. Molecular dynamics simulations indicate that the higher tolerance to water is due to water-cellulose interactions that improves solvation of cellulose and, thereby, marginally favors dissolution. Through Kirkwood-Buff theory we show that water, but not ethanol, improves the solvent quality of DMSO and partly compensates for the loss of acetate-cellulose hydrogen bonds.

  • 25.
    Bengtsson, Jenny
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Olsson, Carina
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Idström, Alexander
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Köhnke, Tobias
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Impact of non-solvents in the tetrabutylammonium acetate: dimethyl sulfoxide-cellulose system2016Conference paper (Other academic)
  • 26.
    Bengtsson, Marcus
    et al.
    Mälardalen University, Sweden.
    Kurdve, Martin
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Machining Equipment Life Cycle Costing Model with Dynamic Maintenance Cost2016In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 48, p. 102-107Article in journal (Refereed)
    Abstract [en]

    This paper presents how a Life cycle cost or Total cost of ownership analysis has been performed on machining equipment in a Swedish company. Life cycle cost models used in case studies are compared to an empirical model, used at the company, where dynamic energy, fluid, and maintenance cost are included. Linear and variable factors in the models are analyzed and discussed regarding data availability and estimation, especially with emphasis on maintenance. The life cycle cost aspect of the equipment give guidelines to consider operation, maintenance, tools, energy, and fluid cost in addition to acquisition cost, when designing/specifying the equipment.

  • 27.
    Berglund, J.
    et al.
    Sandvik Tooling.
    Wiklund, Daniel
    RISE, Swerea, Swerea IVF.
    Rosén, B.-G.
    Halmstad University.
    A method for visualization of surface texture anisotropy in different scales of observation2011In: Scanning, ISSN 0161-0457, E-ISSN 1932-8745, Vol. 33, no 5, p. 325-331Article in journal (Refereed)
    Abstract [en]

    Anisotropy of functional surfaces can in many practical cases significantly influence the surface function. Tribological contacts in sheet forming and engine applications are good examples. This article introduces and exemplifies a method for visualization of anisotropy. In a single graph, surface texture properties related to the anisotropy as a function of scale are plotted. The anisotropy graph can be used to explain anisotropy properties of a studied surface such as texture direction and texture strength at different scales of observation. Examples of milled steel surfaces and a textured steel sheet surface are presented to support the proposed methodology. Different aspects of the studied surfaces could clearly be seen at different scales. Future steps to improve filtering techniques and an introduction of length-scale analysis are discussed. Copyright © 2011 Wiley Periodicals, Inc.

  • 28.
    Berglund, Johan
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Blateyron, F.
    Using SEM quad BSEimages for roughness measurement – calibration of reconstructed surfaces2016Conference paper (Other academic)
  • 29.
    Berglund, Johan
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Kjellberg, Mikael
    Liljengren, Magnus
    Kjellsson, Kenneth
    New Test Method for Detection and Analysis of Burrs and Slivers in Trimming and Punching Aluminium Sheet Metal2014Conference paper (Refereed)
  • 30.
    Berglund, Johan
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Troell, Eva
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Surface Topography of Nitrided Steel Surfaces2017Conference paper (Other academic)
  • 31.
    Berglund, M.
    et al.
    Linköping University.
    Harlin, Ulrika
    RISE, Swerea, Swerea IVF.
    Gustavsson, M.
    Linköping University.
    Säfsten, K.
    Jönköping University.
    New ways of organizing product introductions2012In: Work, 2012, Vol. 41, no SUPPL.1, p. 4856-4861Conference paper (Refereed)
    Abstract [en]

    The aim of this paper is to describe and reflect on an interactive research approach used to address the challenges on how to improve product introductions, the part of the product realization process associated with the transfer of a product from product development to serial production. In the interactive research approach, research results as well as improvement of practice are given equal importance. The collaboration between researchers and practitioners therefore addresses both the focus and the process of the change. The approach includes four main iterative steps: 1) mapping/diagnosis, 2) feedback of results, 3) participation in development activities, and 4) follow-up/evaluation. The paper reports findings from interactive research in one company within office product industry and one company group, consisting of three company units within the engine industry. Preliminary findings indicate that the participating companies afterwards work in a more structured way with product introductions and that the employees have gained deeper knowledge about product introductions as well as experienced the advantages of working across functional boundaries. Furthermore, the interactive research approach is suitable to run projects from an ergonomics perspective as it focuses on developing both practice and theory, it is human-centered, and it emphasizes broad participation from practitioners. © 2012 - IOS Press and the authors. All rights reserved.

  • 32.
    Berglund, Martina
    et al.
    Linköping University.
    Harlin, Ulrika
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Boundary crossing in product introductions considering humans, technology and organization2014In: Proceedings of ODAM NES 2014 / [ed] O. Broberg, N. Fallentin, P. Hasle, P.L. Jensen, A. Kabel, M.E. Larsen, T. Weller, 2014, p. 349-354Conference paper (Refereed)
    Abstract [en]

    The objective of the paper is to analyze how a product introduction involving Swedish-Chinese collaboration was influenced by human, technological and organizational aspects. The study showed that technical challenges concerned the infrastructure for communication and quality issues; organizational challenges concerned the new project model and updating drawing versions; and human related challenges included cultural differences and communication. The product introduction was highly challenging by crossing earlier boundaries in the human, technical, and organizational subsystems. Strong work demands were placed on the individuals while offering great opportunities for individual learning. Concurrent development of a new project model resulted in organizational learning.

  • 33.
    Berglund, Martina
    et al.
    Linköping University.
    Harlin, Ulrika
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Elg, Mattias
    Linköping University.
    AFoU – a network for sustainable working life and development2017In: Proc. of the The Nordic Ergonomics and Society conference, NES-2017 ‘Joy at Work’, organized by Lund University (LTH) in association with the Ergonomics and Human Factors Society in Sweden (EHSS), and 20-23 August 2017, Sweden, Lund, 2017Conference paper (Other academic)
    Abstract [en]

    The aim of this paper is to describe and reflect on the development of the Swedish network AFoU (Workplace related R&D for sustainable working life). The overall goal with the network AFoU is to strengthen research contributing to sustainable working life, research that makes significant improvements, and future organizations characterized by competitiveness, quality and renewal through good working conditions. AFoU was started in 2015 and it consists of researchers from different disciplines, practitioners and representatives for unions and employer organizations. The network strives to combine high-quality research with practical use. This is achieved through collaboration between different stakeholders and across disciplines, thereby co-creating new knowledge that is needed to meet current and future demands.

  • 34.
    Berglund, Richard
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Karling, Mats
    Mellby, Clas
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Det värdefulla engagemanget: En guide för Lean och för andra strategier för utveckling2011Book (Other academic)
    Abstract [sv]

    En organisation där alla agerar på eget initiativ för det gemensamma bästa, där alla är beredda att hugga i när det behövs, där alla samspelar för att nå resultat och där alla bidrar till att utveckla organisationen-visst är detta en dröm?Alla vill att medarbetarna och kollegorna ska engagera sig. Men varför skulle de? Har företaget gjort sig förtjänt av att någon gör mer än hon måste?I de allra flesta organisationer underskattas gravt den omsorg som behövs för att medarbetarna ska finna det mödan värt att engagera sig. Det krävs ett klokt och långsiktigt arbete från ledning och chefer för att bygga en företagskultur av förtroende och samverkan, men om det lyckas finns oanade vinster att hämta.Den nya boken, Det värdefulla engagemanget-En guide för Lean och andra strategier för utveckling, vill stimulera till en reflektion kring hur organisationen och ledningen påverkar medarbetarnas engagemang. Boken följer upp vår tidigare bok Lean i ledningen-Utmana hela organisationen, som blivit mycket uppskattad, men Det värdefulla engagemanget är till nytta oberoende av eventuella Leansatsningar.Tio teman behandlas: En färdriktning • En kultur av tillit • Aktiv ledning • Långsiktighet • Utrymme för individen • Lagarbete • Inflytande • Utmaning • Lärande • Del av vinstenDe kunskaper och erfarenheter som lett fram till boken har sin grund i många års uppdrag och forskningsprojekt inom industrin och även i tjänsteföretag. Boken bygger till stor del på en doktorsavhandling,Engagemang efterfrågas – Hur tre tillverkande företag söker medverkan från sina medarbetare när de inför Lean, men är förenklad och omskriven för att direkt kunna tillämpas.

  • 35.
    Berglund, Richard
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Laring, J
    Nonås, Kathe
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Proposition for a Method to Engage Employees in Lean-inspired organizations in a Scandinavian Context2014Conference paper (Other academic)
  • 36.
    Billur, E.
    et al.
    Ohio State University.
    Demiralp, Y.
    Ohio State University.
    Groseclose, A.R.
    Ohio State University.
    Wadman, Boel
    RISE, Swerea, Swerea IVF.
    Altari, T.
    Ohio State University.
    Factors affecting the accuracy of flow stress determined by the bulge test2011In: Special Edition: 10th International Conference on Technology of Plasticity, ICTP 2011, 2011, p. 726-731Conference paper (Refereed)
    Abstract [en]

    The determination of the flow stress curve at room temperature, using the bulge test under biaxial deformation conditions, has been extensively studied. However, two Issues still deserve close examination: (1) validity of assuming a spherical bulge shape and (2) the effects of yield criterion and/or normal anisotropy. In this paper, we present experimental measurements to validate spherical assumption, as well as a methodology to calculate flow stress curves, all the way up to the failure point, that are free from the effects of anisotropy. Experimental studies were conducted on draw quality steel (DQS) and several grades of Dual Phase (DP) Advanced High Strength Steels (AHSS). © 2011 Wiley-VCH Verlag GmbH & Co. KGaA. Weinheim.

  • 37.
    Bolin, M.H.
    et al.
    Linköping University.
    Svennersten, K.
    Karolinska Institutet.
    Wang, X.
    Linköping University.
    Chronakis, Ioannis
    RISE, Swerea, Swerea IVF.
    Richter-Dahlfors, A.
    Karolinska Institutet.
    Jager, E.W.H.
    Linköping University.
    Berggren, M.
    Linköping University.
    Nano-fiber scaffold electrodes based on PEDOT for cell stimulation2009In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 142, no 2, p. 451-456Article in journal (Refereed)
    Abstract [en]

    Electronically conductive and electrochemically active 3D-scaffolds based on electrospun poly(ethylene terephthalate) (PET) nano-fibers are reported. Vapour phase polymerization was employed to achieve an uniform and conformal coating of poly(3,4-ethylenedioxythiophene) doped with tosylate (PEDOT:tosylate) on the nano-fibers. The PEDOT coatings had a large impact on the wettability, turning the hydrophobic PET fibers super-hydrophilic. SH-SY5Y neuroblastoma cells were grown on the PEDOT coated fibers. The SH-SY5Y cells adhered well and showed healthy morphology. These electrically active scaffolds were used to induce Ca2+ signalling in SH-SY5Y neuroblastoma cells. PEDOT:tosylate coated nano-fibers represent a class of 3D host environments that combines excellent adhesion and proliferation for neuronal cells with the possibility to regulate their signalling. © 2009 Elsevier B.V. All rights reserved.

  • 38.
    Boork, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Eriksson, Jerry
    RISE, Swerea, Swerea IVF, Elektronikhårdvara.
    Werner, Anna
    Moderna solskyddsfilmer och deras optiska, termiska och långstidsegenskaper: En förstudie2013Report (Refereed)
  • 39.
    Bougas, K.
    et al.
    Malmö University.
    Jimbo, R.
    Malmö University.
    Vandeweghe, S.
    Malmö University.
    Hayashi, M.
    Malmö University.
    Bryington, M.
    Malmö University.
    Kozai, Y.
    Kanagawa Dental College.
    Schwartz-Filho, H.O.
    Araraquara Dental School.
    Tovar, N.
    New York University.
    Adolfsson, Erik
    RISE, Swerea, Swerea IVF.
    Ono, D.
    Nagasaki University.
    Coelho, P.G.
    New York University.
    Wennerberg, A.
    Malmö University.
    Bone apposition to laminin-1 coated implants: Histologic and 3D evaluation2013In: International Journal of Oral and Maxillofacial Surgery, ISSN 0901-5027, E-ISSN 1399-0020, Vol. 42, no 5, p. 677-382Article in journal (Refereed)
    Abstract [en]

    Laminin-1 has been reported as one of the factors responsible for the nucleation of calcium phosphates and, in vitro, has been reported to selectively recruit osteoprogenitors. This article focused on its in vivo effects, and evaluated the effect of laminin-1 local application on osseointegration. Polished cylindrical hydroxyapatite implants were coated with laminin-1 (test) and the bone responses in the rabbit tibiae after 2 and 4 weeks were evaluated and compared to the non-coated implants (control). Before the samples were processed for histological sectioning, they were three-dimensionally analysed with micro computed tomography (μCT). Both evaluation methods were analysed with regards to bone area around the implant and bone to implant contact. From the histologic observation, new bone formation around the laminin-1 coated implant at 2 weeks seemed to have increased the amount of supporting bone around the implant, however, at 4 weeks, the two groups presented no notable differences. The two-dimensional and three-dimensional morphometric evaluation revealed that both histologic and three-dimensional analysis showed some tendency in favour of the test group implants, however there was no statistical significance between the test and control group results. © 2012 International Association of Oral and Maxillofacial Surgeons.

  • 40.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Amen, R.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Adolfsson, E.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Tegehall, Per-Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Johander, Per
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Thermo-mechanical simulations and measurements on high temperature interconnections2011In: 2011 12th Int. Conf. on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2011, 2011Conference paper (Refereed)
    Abstract [en]

    In order to place sensors or electronics in very high temperature environments, new materials and methods for interconnection are required. A comparative study between different electrical interconnection methods for very high operation temperatures (500 °C - 800 °C) is presented. Thermo-mechanical simulations and characterization of samples of the interconnection types during high temperature exposure are presented. The results of the thermo-mechanical simulations showed that stresses are low in a connection system based on liquid interconnection. This system, however, proved to be difficult to realize due to problems with oxides and sealing of the metallic liquid. Modeling of an interconnection based purely on mechanical pressure without any solder or metallic bond showed high stress. This was also confirmed during high temperature exposure where the connection failed. High stress was also predicted for an interconnection based on nano-Ag paste. The high temperature tests, however, showed promising results at 800 °C for over 100 hours. © 2011 IEEE.

  • 41.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Edwards, Mark
    University of Oxford.
    Kaulfersch,, Eberhard
    Fraunhofer Institute for Electronic Nano Systems ENAS.
    Neumaier, Klas
    Zschieschang, Olaf
    Hilpert, F
    Otto, Alexander
    Modelling and fabrication of a SiC-based power module with double sidedcooling2015Conference paper (Other academic)
  • 42.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Edwards, M.
    Chalmers University of Technology.
    Ottosson, J.
    Volvo Group Truck Technology.
    Neumaier, K.
    Fairchlld Semiconductor GmbH.
    Zschieschang, O.
    Fairchlld Semiconductor GmbH.
    Otto, A.
    Fraunhofer ENAS.
    Kaulfersch, E.
    Berliner Nanotest und Design GmbH.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Thermo-mechanical simulations of SiC power modules with single and double sided cooling2015In: 2015 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2015, Institute of Electrical and Electronics Engineers Inc. , 2015Conference paper (Refereed)
    Abstract [en]

    Effectively removing dissipated heat from the switching devices enables a higher current carrying capability per chip area ratio, thus leading to smaller or fewer devices for a given power requirement specification. Further, the use of SiC based devices has proven to increase the efficiency of the system thereby reducing the dissipated heat. Thermal models have been used to compare SiC power modules. Single and double sided cooling have been simulated. The simulated maximum temperatures were 141 °C for the single sided version and 119.7 °C for the double sided version. In addition, the reliability of a single sided module and thermally induced plastic strains of a double sided module have been investigated. A local model of the wire bond interface to the transistor metallization shows a 3‰ maximum increase in plastic strain during the power cycle. Simulations of the creep strain rates in the die attach solder layer for a power cycling loads also shows a 3‰ increase in creep strain per cycle. © 2015 IEEE.

  • 43.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Edwards, Michael
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Simon, J
    Noël, S
    Romanjek, K
    Simulation-driven packaging of proof of concept thermoelectric modules: Proceedings of SMTA PanPacific Microelectronics Symposium 20142014In: Proceedingsof SMTA Pan Pacific Microelectronics Symposium 2014, 2014Conference paper (Other academic)
  • 44.
    Brinkfeldt, Klas
    et al.
    RISE, Swerea, Swerea IVF.
    Enoksson, P.
    Chalmers University of Technology.
    Wieser, M.
    Swedish Institute of Space Physics.
    Barabash, S.
    Swedish Institute of Space Physics.
    Emanuelsson, M.
    Swedish Institute of Space Physics.
    Microshutters for MEMS-based time-of-flight measurements in space2011In: Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), 2011, p. 597-600Conference paper (Refereed)
    Abstract [en]

    This paper reports on the fabrication, integration and first operation of a mechanical microshutter in a time-of-flight (TOF) based ion detector in space. The microshutter is fabricated from a silicon on insulator (SOI) wafer and operated in a resonance mode, 306 kHz. Open time of the shutter is 100 ns. The microshutters are integrated in the PRIMA instrument, which is part of the payload on the Swedish PRISMA mission. PRISMA was successfully launched into low Earth orbit on June 15, 2010.

  • 45.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Formánek, J.
    Czech Technical University.
    Laposa, A.
    Czech Technical University.
    Jakovenko, J.
    Czech Technical University.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Johander, Per
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Simulations of a high temperature pressure sensor packaging and interconnection2012In: 2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2012, 2012Conference paper (Refereed)
    Abstract [en]

    Modeling and thermal cycling of a high temperature pressure sensor packaging is presented. The packaging is based on the green-state milling of alumina to the desired geometry and conduits for the electrical conductors, followed by sintering of the ceramics with the electrical conductors inside. The electrical interconnections are based on silver. For short term operation, the package can be exposed to temperatures close to the melting temperature of silver (961°C). It has shown operational in temperature cycling above 600°C for more than 1800 hours. Modeling of the package show that the stress in the electrical interconnections are close to the yield stress of silver at 20°C. The stress free temperature in the modeling was set to 850°C. Temperature induced stress and strains in the packaging and a fatigue simulation are performed. The package is generic and can be converted to fit most geometries and high temperature applications. © 2012 IEEE.

  • 46.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Neumaier, K.
    Fairchild Semiconductor GmbH.
    Mann, Alexander
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Zschieschang, O.
    Fairchild Semiconductor GmbH.
    Otto, A.
    Fraunhofer ENAS.
    Kaulfersch, E.
    Berhner Nanotest und DesIgn GmbH.
    Edwards, Michael
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Modeling of SiC power modules with double sided cooling2014In: 2014 15th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2014, IEEE Computer Society , 2014Conference paper (Refereed)
    Abstract [en]

    Silicon Carbide (SiC) based transistor devices have demonstrated higher efficiency switching operation compared to silicon-based, state-of-the-art solutions due to the superior electrical and thermal properties of the SiC material. The improved current density and thermal conductivity allows SiC-based power modules to be smaller than their silicon counterparts for comparable current densities. The active chip area can be reduced further by effectively cooling the devices. In this work, a new power module including SiC bipolar junction transistors (BJT) and diodes and integrated double sided cooling will be introduced. The target application of these modules is a new drive-train system for commercial electric vehicles. © 2014 IEEE.

  • 47.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Elektronikhårdvara.
    Ottosson, Jonas
    Neumaier, Klaus
    Zschieschang, Olaf
    Kaulfersch, Eberhard
    Edwards, Michael
    Otto, Alexander
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Elektronikhårdvara.
    Design and Fabrication of a SiC-Based Power Module with Double-Sided Cooling for Automotive Applications2015In: Advanced Microsystems for Automotive Applications 2015: Smart Systems for Green and Automated Driving, 2015, Vol. 4, p. 157-172Conference paper (Refereed)
    Abstract [en]

    The electrification of drive trains combined with special requirements of the automotive and heavy construction equipment applications drives the development of small, highly integrated and reliable power inverters. To minimize the volume and increase the reliability of the power switching devices a module consisting of SiC devices with double sided cooling capability has been developed. There are several benefits related to cooling the power devices on both sides. The major improvement is the ability to increase the power density, and thereby reduce the number of active switching devices required which in turn reduces costs. Other expected benefits of more efficient cooling are reductions in volume and mass per power ratio. Alternatively, improved reliability margins due to lower temperature swings during operation are can be expected. Removing the wire bonds on the top side of the devices is expected to improve the reliability regardless, since wire bonds are known to be one of the main limitations in power switching devices. In addition, it is possible to design the package with substantially lower inductance, which can allow faster switching of the devices. In this paper the design, simulations and fabrication process of a double sided SiC-based power module are presented.

  • 48.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Ottosson, Jonas
    Volvo Group Truck Technology.
    Otto, Alex
    Fraunhofer ENAS.
    Mann, Alexander
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Zschieschang, Olaf
    Fairchild Semiconductor GmbH.
    Frankeser, Sophia
    TU Chemnitz.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Thermal Simulations and Experimental Verification of Power Modules Designed for Double Sided Cooling2016In: Electronic Components and Technology, ISSN 0569-5503, ISSN 05695503, p. 1415-1422Article in journal (Refereed)
    Abstract [en]

    Cooling power modules on both sides of the active switching devices reduces the operational junction temperature compared to conventional single sided cooling. In this work, thermal simulations of power modules based on single sided cooling concepts are compared with double sided cooling counterparts. Expected junction temperatures, maximum temperatures and maximum current capability is analyzed. In addition, experimental verification in the form of comparisons with thermal characterization tests for both single-And double sided power modules based on SiC bipolar junction transistors is presented. Results from simulations show that cooling of both sides of the active switching devices can reduce the thermal resistance by more than 40 percent. This number depends on the heat transfer coefficient. From one example, simulating a worst case stall condition of the electric machine, the use of double sided cooling reduces the maximum junction temperature from 167 °C to 106 °C at a load current of 300 A using a heat transfer coefficient of 4 kW/m2K and 4 kHz switching frequency. Furthermore, the temperature decreases to 97°C if AlN-based DBC substrates are used instead of alumina DBCs. Results from the experimental comparison between double-And single sided cooling showed that the maximum temperature for a load current range of 15 A to 50 A was reduced by 18 percent to 55 percent by using double sided cooling. At a device temperature of 60 °C, the increased thermal capability of the double sided version allowed for a 20 A higher load current, which corresponded to operation under 50 percent higher power losses. Double sided cooling also increased the maximum current capability through a single SiC BJT by more than 20 percent beyond the maximum current capability through the single sided cooling version.

  • 49.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Åklint, Thorbjörn
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Neumaier, K.
    Fairchild Semiconductor GmbH.
    Zschieschang, O.
    Fairchild Semiconductor GmbH.
    Edwards, M.
    Chalmers University of Technology.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Model verification of heat exchangers in a flow test rig2015In: 2015 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2015, Institute of Electrical and Electronics Engineers Inc. , 2015Conference paper (Refereed)
    Abstract [en]

    In power electronics, more efficient removal of heat from the junction of power devices leads to a higher power rating per die, which in turn leads to fewer die and reduced system volume. Since temperature is a main driver in expected failure modes an increase in cooling capability can also enhance margins of the device reliability. Previously, CFD simulations of two novel heat exchanger designs that will be used in a power module with double sided cooling have been reported on. The heat exchangers are fabricated by direct 3D manufacturing of copper structures, which allows almost complete freedom in geometric design. Two novel geometries of heat exchanger cooling structures have previously been modeled in terms of thermal performance and expected pressure drop. A flow rig has been designed and calibrated to measure thermal performance and pressure drops of these heat sinks. For calibration purposes, measurements of the thermal response of wave structured and unstructured heat sinks are reported here. The results show that, as expected, the heat sink temperatures are lower for all flow rates in the wavestructured geometry. A thermal CFO model accurately predicts the behavior of the temperature difference between inlet and outlet versus flow rate, but predicts higher absolute temperature values. It was also found that the model underestimates the pressure drop over the tested heat sillies. The pressure drop across a novel pine cone geometry heat sink fabricated by additive manufacturing methods was also measured. Comparisons to a reduced model, which neglects everything before the inlet and after the outlet of the tested device, showed that the behavior of this pine structured heat sink was not predicted correctly. The pressure drop increased more rapidly with flow rates in the model than in the measurements. The main source of error in the measurements and simulations comes from a lack of thermal loading. Future work to improve the flow rig includes possibilities to increase the temperature loading at the bottom of the heat sink under test. © 2015 IEEE.

  • 50.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Åklint, Thorbjörn
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Sandberg, Chet
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Johander, Per
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
    High temperature packaging for SiC power transistors2012In: Proceedings - 2012 45th International Symposium on Microelectronics, IMAPS 2012, 2012, p. 1124-1130Conference paper (Refereed)
    Abstract [en]

    Power transistors based on silicon carbide (SiC) are now commercially available. They have a higher efficiency and higher voltage blocking capabilities than conventional silicon devices. The wide-band gap and chemical inertness of SiC makes it suitable to high temperature operation. However, there is a need for new packaging for power transistors that can operate in higher temperatures. We have developed a package based on ceramics and silver for high temperature operation of SiC power transistors. Three types of SiC devices from different manufacturers are packaged and tested in room temperature. Though the devices were still functional after the packaging process, their performance seem to have degraded. This could be a result of the high temperature packaging process and the measurement setup. FEM simulations are also performed to investigate the thermo-mechanical behavior of the package. The target operating temperature of the package is 400°C. Modeling show stress concentrations at the corners of the device chip and suggests that this stress is decreased if the substrate metallization is changed from copper to silver.

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