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  • 51.
    Bakowski, M
    et al.
    RISE., Swedish ICT, Acreo.
    Lim, J-K
    RISE., Swedish ICT, Acreo.
    Kaplan, W
    Schöner, A
    Merits of buried grid technology for advanced SiC device concepts2011Ingår i: ECS Transactions, ISSN 1938-5862, E-ISSN 1938-6737, Vol. 41, nr 8, s. 155-62Artikel i tidskrift (Refereegranskat)
  • 52.
    Bakowski, M
    et al.
    RISE., Swedish ICT, Acreo.
    Schöner, A
    Petermann, I
    RISE., Swedish ICT, Acreo.
    Savage, S
    Silicon carbide APD with improved detection sensitivity stability2010Ingår i: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 645-648, s. 1089-Artikel i tidskrift (Refereegranskat)
  • 53.
    Bakowski, Mietek
    et al.
    RISE., Swedish ICT, Acreo.
    Lim, Jang-Kwon
    RISE., Swedish ICT, Acreo.
    Kaplan, Wlodek
    RISE., Swedish ICT, Acreo.
    Merits of Buried Grid Technology for SiC JBS Diodes2012Ingår i: GALLIUM NITRIDE AND SILICON CARBIDE POWER TECHNOLOGIES 2, 2012, s. 415-424Konferensbidrag (Refereegranskat)
    Abstract [en]

    The SiC Schottky barrier diodes for 200 degrees C to 250 degrees C operation have been developed using buried grid (BG) technology. 2A and 10A, 1700V BG JBS diodes have been fabricated and evaluated. Manufactured 10A, 1700V BG JBS diodes have leakage current at least three orders of magnitude lower compared to the typical data sheet values of the commercial devices. The leakage current at 250 degrees C is of the same order of magnitude as that of the commercial devices at 175 degrees C. The two alternative technologies for realization of BG, implantation and epitaxy, have been compared by simulations. The epitaxial grid is shown to have superior potential for best trade-off between on-state voltage and leakage current.

  • 54.
    Bakowski, Mietek
    et al.
    RISE., Swedish ICT, Acreo.
    LIm, Jang-Kwon
    RISE., Swedish ICT, Acreo.
    Kaplan, Wlodek
    RISE., Swedish ICT, Acreo.
    Schöner, Adolf
    RISE., Swedish ICT, Acreo.
    Merits of Buried Grid Technology for Advanced SiC Device Concepts2011Ingår i: ECS Transactions, ISSN 1938-5862, E-ISSN 1938-6737, Vol. 41, nr 8, s. 155-162Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Some chosen examples of the use of buried grid technology for advanced SiC devices are discussed. First example is development of normally-off and normally-on JFETs. Second is the development of Schottky diodes for high temperature operation. Other examples are efficient junction termination and avalanche UV detector. Experimental results are used in support of simulations.

  • 55. Barkowsky, M
    et al.
    Sedano, I
    Brunnström, K
    RISE., Swedish ICT, Acreo.
    Leszczuk, M
    Staelens, N
    Hybrid video quality prediction: Re-viewing video quality meausurement for widening application scope2014Ingår i: Multimedia tools and applications, ISSN 1380-7501, E-ISSN 1573-7721, Vol. 74, nr 2, s. 323-Artikel i tidskrift (Refereegranskat)
  • 56.
    Barkowsky, Marcus
    et al.
    University of Nantes, France.
    Masala, Enrico
    Polytechnic University of Turin, Italy.
    Van Wallendael, Glenn
    Ghent University, Belgium.
    Brunnström, Kjell
    RISE., Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Staelens, Nicolas
    Ghent University, Belgium.
    Le Callet, Patrick
    University of Nantes, France.
    Objective Video Quality Assessment - Towards large scale video database enhanced model development2015Ingår i: IEICE transactions on communications, ISSN 0916-8516, E-ISSN 1745-1345, Vol. E98.B, nr 1, s. 2-11Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The current development of video quality assessment algorithms suffers from the lack of available video sequences for training, verification and validation to determine and enhance the algorithm’s application scope. The Joint Effort Group of the Video Quality Experts Group (VQEG-JEG) is currently driving efforts towards the creation of large scale, reproducible, and easy to use databases. These databases will contain bitstreams of recent video encoders (H.264, H.265), packet loss impairment patterns and impaired bitstreams, pre-parsed bitstream information into files in XML syntax, and well-known objective video quality measurement outputs. The database is continuously updated and enlarged using reproducible processing chains. Currently, more than 70,000 sequences are available for statistical analysis of video quality measurement algorithms. New research questions are posed as the database is designed to verify and validate models on a very large scale, testing and validating various scopes of applications, while subjective assessment has to be limited to a comparably small subset of the database. Special focus is given on the principles guiding the database development, and some results are given to illustrate the practical usefulness of such a database with respect to the detailed new research questions.

  • 57.
    Beland, M-C
    et al.
    RISE., Swedish ICT, Acreo.
    Bennett, J M
    Effect of local microroughness on the gloss uniformity of printed paper surfaces2000Ingår i: Appl. Opt., Vol. 39, s. 2719-Artikel i tidskrift (Refereegranskat)
  • 58.
    Belov, Ilia
    et al.
    Jönköping University, Sweden.
    Lang, Jenny
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Hellén, Johan
    Saab AB, Sweden.
    Lim, Jang-Kwon
    RISE., Swedish ICT, Acreo.
    Schødt, Bo
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Nilsson, Torbjörn M. J.
    Saab AB, Sweden.
    Poder, Ralf
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Bakowski, Mietek
    RISE., Swedish ICT, Acreo.
    Leisner, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Reliability study of GaN HEMTs2016Konferensbidrag (Övrigt vetenskapligt)
  • 59.
    Bender, P.
    et al.
    University of Cantabria, Spain.
    Balceris, C.
    University of Cantabria, Spain.
    Ludwig, F.
    TU Braunschweig, Germany.
    Posth, O.
    Physikalisch-Technische Bundesanstalt, Germany.
    Bogart, L. K.
    University College London, UK.
    Szczerba, W.
    Bundesanstalt für Materialforschung und -prüfung, Germany; AGH University of Science and Technology, Poland.
    Castro, A.
    SOLVE Research and Consultancy AB, Sweden.
    Nilsson, L.
    SOLVE Research and Consultancy AB, Sweden; Lund University, Sweden.
    Costo, R.
    Instituto de Ciencia de Materiales de Madrid, Spain.
    Gavilán, H.
    Instituto de Ciencia de Materiales de Madrid, Spain.
    González-Alonso, D.
    University of Cantabria, Spain.
    Pedro, I. D.
    University of Cantabria, Spain.
    Barquin, L. F.
    University of Cantabria, Spain.
    Johansson, C.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Distribution functions of magnetic nanoparticles determined by a numerical inversion method2017Ingår i: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 19, nr 7, artikel-id 073012Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the present study, we applied a regularized inversion method to extract the particle size, magnetic moment and relaxation-time distribution of magnetic nanoparticles from small-angle x-ray scattering (SAXS), DC magnetization (DCM) and AC susceptibility (ACS) measurements. For the measurements the particles were colloidally dispersed in water. At first approximation the particles could be assumed to be spherically shaped and homogeneously magnetized single-domain particles. As model functions for the inversion, we used the particle form factor of a sphere (SAXS), the Langevin function (DCM) and the Debye model (ACS). The extracted distributions exhibited features/peaks that could be distinctly attributed to the individually dispersed and non-interacting nanoparticles. Further analysis of these peaks enabled, in combination with a prior characterization of the particle ensemble by electron microscopy and dynamic light scattering, a detailed structural and magnetic characterization of the particles. Additionally, all three extracted distributions featured peaks, which indicated deviations of the scattering (SAXS), magnetization (DCM) or relaxation (ACS) behavior from the one expected for individually dispersed, homogeneously magnetized nanoparticles. These deviations could be mainly attributed to partial agglomeration (SAXS, DCM, ACS), uncorrelated surface spins (DCM) and/or intra-well relaxation processes (ACS). The main advantage of the numerical inversion method is that no ad hoc assumptions regarding the line shape of the extracted distribution functions are required, which enabled the detection of these contributions. We highlighted this by comparing the results with the results obtained by standard model fits, where the functional form of the distributions was a priori assumed to be log-normal shaped.

  • 60.
    Bender, P.
    et al.
    University of Cantabria, Spain .
    Bogart, L. K.
    University College London, UK .
    Posth, O.
    Physikalisch-Technische Bundesanstalt, Germany .
    Szczerba, W.
    BAM Bundesanstalt für Materialforschung Und-prüfung, Germany ; AGH University of Science and Technology, Poland .
    Rogers, S. E.
    ISIS-STFC Neutron Scattering Facility, UK.
    Castro, A.
    SOLVE Research and Consultancy AB, Sweden .
    Nilsson, L.
    SOLVE Research and Consultancy AB, Sweden; Lund University, Sweden.
    Zeng, L. J.
    Chalmers University of Technology, Sweden.
    Sugunan, Abhilash
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Sommertune, Jens
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Fornara, A.
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    González-Alonso, D.
    University of Cantabria, Spain .
    Fernández Barquín, L.
    University of Cantabria, Spain.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Structural and magnetic properties of multi-core nanoparticles analysed using a generalised numerical inversion method2017Ingår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, artikel-id 45990Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The structural and magnetic properties of magnetic multi-core particles were determined by numerical inversion of small angle scattering and isothermal magnetisation data. The investigated particles consist of iron oxide nanoparticle cores (9 nm) embedded in poly(styrene) spheres (160 nm). A thorough physical characterisation of the particles included transmission electron microscopy, X-ray diffraction and asymmetrical flow field-flow fractionation. Their structure was ultimately disclosed by an indirect Fourier transform of static light scattering, small angle X-ray scattering and small angle neutron scattering data of the colloidal dispersion. The extracted pair distance distribution functions clearly indicated that the cores were mostly accumulated in the outer surface layers of the poly(styrene) spheres. To investigate the magnetic properties, the isothermal magnetisation curves of the multi-core particles (immobilised and dispersed in water) were analysed. The study stands out by applying the same numerical approach to extract the apparent moment distributions of the particles as for the indirect Fourier transform. It could be shown that the main peak of the apparent moment distributions correlated to the expected intrinsic moment distribution of the cores. Additional peaks were observed which signaled deviations of the isothermal magnetisation behavior from the non-interacting case, indicating weak dipolar interactions.

  • 61.
    Bender, P.
    et al.
    University of Cantabria, Spain.
    Fock, J.
    DTU Technical University of Denmark, Denmark.
    Hansen, M. F.
    DTU Technical University of Denmark, Denmark.
    Bogart, L. K.
    UCL University College London, UK.
    Southern, P.
    UCL University College London, UK.
    Ludwig, F.
    Technische Universität Braunschweig, Germany.
    Wiekhorst, F.
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Szczerba, W.
    Bundesanstalt für Materialforschung und -prüfung, Germany; AGH University of Science and Technology, Poland.
    Zeng, L. J.
    Chalmers University of Technology, Sweden.
    Heinke, D.
    nanoPET Pharma GmbH, Germany.
    Gehrke, N.
    nanoPET Pharma GmbH, Germany.
    Díaz, M. T. F.
    Institut Laue Langevin, France.
    González-Alonso, D.
    University of Cantabria, Spain.
    Espeso, J. I.
    University of Cantabria, Spain.
    Fernández, J. R.
    University of Cantabria, Spain.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Influence of clustering on the magnetic properties and hyperthermia performance of iron oxide nanoparticles2018Ingår i: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 29, nr 42, artikel-id 425705Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Clustering of magnetic nanoparticles can drastically change their collective magnetic properties, which in turn may influence their performance in technological or biomedical applications. Here, we investigate a commercial colloidal dispersion (FeraSpin™R), which contains dense clusters of iron oxide cores (mean size around 9 nm according to neutron diffraction) with varying cluster size (about 18-56 nm according to small angle x-ray diffraction), and its individual size fractions (FeraSpin™XS, S, M, L, XL, XXL). The magnetic properties of the colloids were characterized by isothermal magnetization, as well as frequency-dependent optomagnetic and AC susceptibility measurements. From these measurements we derive the underlying moment and relaxation frequency distributions, respectively. Analysis of the distributions shows that the clustering of the initially superparamagnetic cores leads to remanent magnetic moments within the large clusters. At frequencies below 105 rad s-1, the relaxation of the clusters is dominated by Brownian (rotation) relaxation. At higher frequencies, where Brownian relaxation is inhibited due to viscous friction, the clusters still show an appreciable magnetic relaxation due to internal moment relaxation within the clusters. As a result of the internal moment relaxation, the colloids with the large clusters (FS-L, XL, XXL) excel in magnetic hyperthermia experiments.

  • 62.
    Bender, P.
    et al.
    University of Cantabria, Spain.
    Wetterskog, E.
    Uppsala University, Sweden.
    Honecker, D.
    Institut Laue-Langevin, France.
    Fock, J.
    DTU Technical University of Denmark,, Denmark.
    Frandsen, C.
    DTU Technical University of Denmark, Denmark.
    Moerland, C.
    Technische Universiteit Eindhoven, The Netherlands.
    Bogart, L. K.
    University College London, UK.
    Posth, O.
    Physikalisch-Technische Bundesanstalt, Germany.
    Szczerba, W.
    Bundesanstalt für Materialforschung und-prüfung,Germany; AGH University of Science and Technology, Poland.
    Gavilán, H.
    Instituto de Ciencia de Materiales de Madrid, Spain.
    Costo, R.
    Fernández-Díaz, M. T.
    Institut Laue-Langevin, France.
    González-Alonso, D.
    University of Cantabria, Spain.
    Fernández Barquín, L.
    University of Cantabria, Spain.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Dipolar-coupled moment correlations in clusters of magnetic nanoparticles2018Ingår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, nr 22, artikel-id 224420Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Here, we resolve the nature of the moment coupling between 10-nm dimercaptosuccinic acid-coated magnetic nanoparticles. The individual iron oxide cores were composed of >95% maghemite and agglomerated to clusters. At room temperature the ensemble behaved as a superparamagnet according to Mössbauer and magnetization measurements, however, with clear signs of dipolar interactions. Analysis of temperature-dependent ac susceptibility data in the superparamagnetic regime indicates a tendency for dipolar-coupled anticorrelations of the core moments within the clusters. To resolve the directional correlations between the particle moments we performed polarized small-angle neutron scattering and determined the magnetic spin-flip cross section of the powder in low magnetic field at 300 K. We extract the underlying magnetic correlation function of the magnetization vector field by an indirect Fourier transform of the cross section. The correlation function suggests nonstochastic preferential alignment between neighboring moments despite thermal fluctuations, with anticorrelations clearly dominating for next-nearest moments. These tendencies are confirmed by Monte Carlo simulations of such core clusters.

  • 63.
    Bender, Philipp
    et al.
    Universidad de Cantabria, Spain.
    Fock, Jeppe
    DTU Technical University of Denmark, Denmark.
    Frandsen, Cathrine
    DTU Technical University of Denmark, Denmark.
    Hansen, Mikkel F.
    DTU Technical University of Denmark, Denmark.
    Balceris, Christoph
    TU Braunschweig, Germany.
    Ludwig, Frank
    TU Braunschweig, Germany.
    Posth, Oliver
    Physikalisch-Technische Bundesanstalt, Germany.
    Wetterskog, Erik
    Uppsala University, Sweden.
    Bogart, Lara K.
    University College London, UK.
    Southern, Paul
    University College London, UK.
    Szczerba, Wojciech
    Bundesanstalt für Materialforschung und -prüfung, Germany; AGH University of Science and Technology, Poland.
    Zeng, Lunjie
    Chalmers University of Technology, Sweden.
    Witte, Kerstin
    University of Rostock, Germany; Micromod Partikeltechnologie GmbH, Germany.
    Gruettner, Cordula
    Micromod Partikeltechnologie GmbH, Germany.
    Westphal, Fritz
    Micromod Partikeltechnologie GmbH, Germany.
    Honecker, Dirk
    Institut Laue-Langevin, France.
    Gonzalez-Alonso, David
    Universidad de Cantabria, Spain.
    Fernandez Barquin, Luis
    Universidad de Cantabria, Spain.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Relating Magnetic Properties and High Hyperthermia Performance of Iron Oxide Nanoflowers2018Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, nr 5, s. 3068-3077Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigated, in depth, the interrelations among structure, magnetic properties, relaxation dynamics and magnetic hyperthermia performance of magnetic nanoflowers. The nanoflowers are about 39 nm in size, and consist of densely packed iron oxide cores. They display a remanent magnetization, which we explain by the exchange coupling between the cores, but we observe indications for internal spin disorder. By polarized small-angle neutron scattering, we unambiguously confirm that, on average, the nano flowers are preferentially magnetized along one direction. The extracted discrete relaxation time distribution of the colloidally dispersed particles indicates the presence of three distinct relaxation contributions. We can explain the two slower processes by Brownian and classical Neel relaxation, respectively. The additionally observed very fast relaxation contributions are attributed by us to the relaxation of disordered spins within the nanoflowers. Finally, we show that the intrinsic loss power (ILP, magnetic hyperthermia performance) of the nanoflowers measured in colloidal dispersion at high frequency is comparatively large and independent of the viscosity of the surrounding medium. This concurs with our assumption that the observed relaxation in the high frequency range is primarily a result of internal spin relaxation, and possibly connected to the disordered spins within the individual nanoflowers.

  • 64.
    Beni, Valerio
    et al.
    Linköping University, Sweden.
    Nilsson, David
    RISE., Swedish ICT, Acreo.
    Arven, Patrik
    Electrical Engineering J2 Holding AB, Sweden.
    Norberg, Petronella
    RISE., Swedish ICT, Acreo.
    Gustafsson, Göran
    RISE., Swedish ICT, Acreo.
    Turner, Anthony Peter Francis
    Linköping University, Sweden.
    Printed electrochemical instruments for biosensors2015Ingår i: ECS Transactions, 2015, Vol. 66, nr 37, s. 1-13Konferensbidrag (Refereegranskat)
    Abstract [en]

    Mobile diagnostics for healthcare, food safety and environmental monitoring, demand a new generation of inexpensive sensing systems suitable for production in high volume. Herein we report on the development of a new disposable electrochemical instrument exploiting the latest advances in printed electronics and printed biosensors. The current system is manufactured under ambient conditions with all interconnections printed; electrochemical measurements and data elaboration are realized by the integration onto the platform of two chips: a MICROCHIP-PIC24F16KA101 and a Texas Instrument's LMP91000. A PEDOT.PSS vertical electrochromic display (VECD) is also incorporated into the system to visualize the data. A printed Enfucell 3V manganese dioxide battery was used to deliver the required power. Finally, in order to demonstrate the utility of the system, screen-printed sensors for the detection of glucose were added and the performance of the overall system was evaluated.

  • 65. Berggren, M
    et al.
    Forchheimer, R
    Bobacka, J
    Svensson, P-O
    Nilsson, D
    RISE., Swedish ICT, Acreo, Printed electronics.
    Larsson, O
    Ivaska, A
    PEDOT:PSS-based Electrochemical Transistors for Ion-to-Electron Transduction and Sensor Signal Amplification2008Ingår i: Organic Semiconductors in Sensor Applications, s. 263-280Artikel i tidskrift (Övrigt vetenskapligt)
  • 66.
    Berggren, M
    et al.
    RISE., Swedish ICT, Acreo.
    Nilsson, D
    Robinson, ND
    Organic materials for printed electronics2007Ingår i: Nature Materials, Vol. 6, s. p3-5Artikel i tidskrift (Refereegranskat)
  • 67.
    Berggren, Magnus
    et al.
    Linköping University, Sweden.
    Simon, Daniel T.
    Linköping University, Sweden.
    Nilsson, David
    RISE., Swedish ICT, Acreo.
    Dyreklev, Peter
    RISE., Swedish ICT, Acreo.
    Norberg, Petronella
    RISE., Swedish ICT, Acreo.
    Nordlinder, Staffan
    RISE., Swedish ICT, Acreo.
    Andersson Ersman, Peter
    RISE., Swedish ICT, Acreo.
    Gustafsson, Göran
    RISE., Swedish ICT, Acreo.
    Wikner, J. Jacob
    Linköping University, Sweden.
    Hederen, Jan
    Ericsson AB, Sweden.
    Hentzell, Hans
    RISE., Swedish ICT, Acreo.
    Browsing the Real World using Organic Electronics, Si-Chips, and a Human Touch2016Ingår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 28, nr 10, s. 1911-1916Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Two different e-labels were developed to explore the feasibility and to identify scientifi c and engineering challenges of the Real-World-Web platform. First was a printed biosensor e-label, comprising Si-chips with an array of different printegrated devices, and second, an e-label to explore the feasibility of transferring data, through the human body, between a mobile device and different distributed e-labels, adhered onto the body or onto dedicated devices and surfaces of one's ambience. The silicon chips utilized in e-labels, include analogue and digital circuitry to receive and handle sensory input, to perform signal processing, and to transmit information to antennas and displays. When used, the e-label is turned on, and a sample is then added onto the sensor area. The display provides simple instructions and updated information to the user. All data handling, electrical probing, and analysis of the sensor is performed by the Si-chips, and the sensing data is finally shown in the printed display. The second e-label exemplifies an ID-tag for body area networks (BAN) communication applications, which, in part, is manufactured and integrated in the same way as the first e-label, but with another choice of Si-chips and capacitive antennas.

  • 68. Bergstedt, L
    et al.
    Persson, K
    RISE., Swedish ICT, Acreo.
    Printed Glass for Anodic Bonding - A Packaging Concept for MEMS System On a Chip2002Ingår i: Advancing Microelectronics, Vol. 29, nr 1Artikel i tidskrift (Refereegranskat)
  • 69.
    Bernard, Thomas
    et al.
    Fraunhofer IOSB, Germany.
    Moßgraber, Jürgen
    Fraunhofer IOSB, Germany.
    Madar, Anna Elinge
    ARTTIC, France.
    Rosenberg, Aharon
    Hagihon Ltd, Israel.
    Deuerlein, Jochen
    3S Consult GmbH, Germany.
    Lucas, Helena
    Aguas do Algarve SA, Portugal.
    Boudergui, Karim
    CEA Alternative Energies and Atomic Energy Commission, France.
    Ilver, Dag
    RISE., Swedish ICT, Acreo.
    Brill, Eyal
    Decision Makers Ltd, Israel.
    Ulitzur, Nirit
    BioMonitech Ltd, Israel.
    SAFEWATER - Innovative tools for the detection and mitigation of CBRN related contamination events of drinking water2015Ingår i: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 119, s. 352-359Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The safety and or security of drinking water can be threatened by natural disasters, accidents or malevolent attacks. The European FP7 project SAFEWATER aims at developing a comprehensive event detection and event management solution for drinking water security management and mitigation against major deliberate, accidental or natural CBRN related contaminations. New cost-effective C, B, and RN sensors will be developed. An innovative concept with a broad network of low-cost sensors - "domestic sensors" (complementary to a set of sensors in strategic locations) will be developed. A technology platform will be provide which is able to capture and analyze the data collected by the sensors and from other information systems and give a full overview of the crisis to the responders by means of online look-ahead simulations to efficiently manage potential crises. For testing the SAFEWATER solution it will be integrated with on utility-partners' information systems.

  • 70. Bernstein, GM
    et al.
    Lee, Y
    Gavler, A
    RISE., Swedish ICT, Acreo.
    Martensson, J
    RISE., Swedish ICT, Acreo.
    Modeling WDM wavelength switching systems for use in GMPLS automated path computation2009Ingår i: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 1, nr 1, s. 187-95Artikel i tidskrift (Refereegranskat)
  • 71.
    Berto, Marcello
    et al.
    Università di Modena e Reggio Emilia, Italy.
    Diacci, Chiara
    Linköping University, Sweden.
    Theuer, Lorenz
    RISE - Research Institutes of Sweden, ICT, Acreo. Linköping University, Sweden.
    Di Lauro, Michele
    Università di Modena e Reggio Emilia, Italy.
    Simon, Daniel T.
    Linköping University, Sweden.
    Berggren, Magnus
    Linköping University, Sweden.
    Biscarini, Fabio
    Università di Modena e Reggio Emilia, Italy;Instituto Italiano di Tecnologia—Center for Translational Neurophysiology, Italy.
    Beni, Valerio
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Bortolotti, Carlo A.
    Università di Modena e Reggio Emilia, Italy.
    Label free urea biosensor based on organic electrochemical transistors2018Ingår i: Flexible and Printed Electronics, ISSN 2058-8585, Vol. 3, nr 2, artikel-id 024001Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The quantification of urea is of the utmost importance not only in medical diagnosis, where it serves as a potential indicator of kidney and liver disfunction, but also in food safety and environmental control. Here, we describe a urea biosensor based on urease entrapped in a crosslinked gelatin hydrogel, deposited onto a fully printed PEDOT:PSS-based organic electrochemical transistor (OECT). The device response is based on the modulation of the channel conductivity by the ionic species produced upon urea hydrolysis catalyzed by the entrapped urease. The biosensor shows excellent reproducibility, a limit of detection as low as 1 μM and a response time of a few minutes. The fabrication of the OECTs by screen-printing on flexible substrates ensures a significant reduction in manufacturing time and costs. The low dimensionality and operational voltages (0.5 V or below) of these devices contribute to make these enzymatic OECT-based biosensors as appealing candidates for high-throughput monitoring of urea levels at the point-of-care or in the field.

  • 72.
    Bi, Zhaoxia
    et al.
    Lund University, Sweden.
    Lenrick, Filip
    Lund University, Sweden.
    Colvin, Jovana
    Lund University, Sweden.
    Gustafsson, Anders
    Lund University, Sweden.
    Hultin, Olof
    RISE - Research Institutes of Sweden, ICT, Acreo. Lund University, Sweden.
    Nowzari, Ali
    Lund University, Sweden.
    Lu, Taiping
    RISE - Research Institutes of Sweden, ICT, Acreo. Lund University, Sweden.
    Wallenberg, Reine
    Lund University, Sweden.
    Timm, Rainer
    Lund University, Sweden.
    Mikkelsen, Anders
    Lund University, Sweden.
    Ohlsson, Jonas
    Lund University, Sweden.
    Storm, Kristian
    RISE - Research Institutes of Sweden.
    Monemar, Bo
    Lund University, Sweden.
    Samuelson, Lars
    Lund University, Sweden.
    InGaN Platelets: Synthesis and Applications toward Green and Red Light-Emitting Diodes2019Ingår i: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 19, nr 5, s. 2832-2839Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this work, we present a method to synthesize arrays of hexagonal InGaN submicrometer platelets with a top c-plane area having an extension of a few hundred nanometers by selective area metal-organic vapor-phase epitaxy. The InGaN platelets were made by in situ annealing of InGaN pyramids, whereby InGaN from the pyramid apex was thermally etched away, leaving a c-plane surface, while the inclined {101Ì1} planes of the pyramids were intact. The as-formed c-planes, which are rough with islands of a few tens of nanometers, can be flattened with InGaN regrowth, showing single bilayer steps and high-quality optical properties (full width at half-maximum of photoluminescence at room temperature: 107 meV for In 0.09 Ga 0.91 N and 151 meV for In 0.18 Ga 0.82 N). Such platelets offer surfaces having relaxed lattice constants, thus enabling shifting the quantum well emission from blue (as when grown on GaN) to green and red. For single InGaN quantum wells grown on the c-plane of such InGaN platelets, a sharp interface between the quantum well and the barriers was observed. The emission energy from the quantum well, grown under the same conditions, was shifted from 2.17 eV on In 0.09 Ga 0.91 N platelets to 1.95 eV on In 0.18 Ga 0.82 N platelets as a result of a thicker quantum well and a reduced indium pulling effect on In 0.18 Ga 0.82 N platelets. On the basis of this method, prototype light-emitting diodes were demonstrated with green emission on In 0.09 Ga 0.91 N platelets and red emission on In 0.18 Ga 0.82 N platelets.

  • 73. Bicanic, D
    et al.
    Swarts, J
    Luterotti, S
    Helander, P
    RISE., Swedish ICT, Acreo.
    Fogliano, V
    Anese, M
    Optothermistor as a Breakthrough in the Quantification of Lycopene Content of Thermally Processed Tomato-Based Foods: Verification versus Absorption Spectrophotometry High-Performance Liquid Chromatography2005Ingår i: Journal of Agricultural Food Chemistry, Vol. 53, nr 9, s. 3295-99Artikel i tidskrift (Refereegranskat)
  • 74.
    Birkholz, Mario
    et al.
    IHP Innovations for High Performance Microelectronics, Germany.
    Glogener, Paul
    IHP Innovations for High Performance Microelectronics, Germany.
    Glös, Franziska
    IHP Innovations for High Performance Microelectronics, Germany.
    Basmer, Thomas
    IHP Innovations for High Performance Microelectronics, Germany.
    Theuer, Lorenz
    RISE., Swedish ICT, Acreo. Technical University Berlin, Germany.
    Continuously operating biosensor and its integration into a hermetically sealed medical implant2016Ingår i: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 7, nr 10, artikel-id 183Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An integration concept for an implantable biosensor for the continuous monitoring of blood sugar levels is presented. The system architecture is based on technical modules used in cardiovascular implants in order to minimize legal certification efforts for its perspective usage in medical applications. The sensor chip operates via the principle of affinity viscometry, which is realized by a fully embedded biomedical microelectromechanical systems (BioMEMS) prepared in 0.25-μm complementary metal-oxide-semiconductor (CMOS)/BiCMOS technology. Communication with a base station is established in the 402-405 MHz band used for medical implant communication services (MICS). The implant shall operate within the interstitial tissue, and the hermetical sealing of the electronic system against interaction with the body fluid is established using titanium housing. Only the sensor chip and the antenna are encapsulated in an epoxy header closely connected to the metallic housing. The study demonstrates that biosensor implants for the sensing of low-molecular-weight metabolites in the interstitial may successfully rely on components already established in cardiovascular implantology.

  • 75. Bjurshagen, S
    et al.
    Evekull, D
    Koch, R
    RISE., Swedish ICT, Acreo.
    Efficient generation of blue light by frequency doubling of a Nd:YAG laser operating on (4)F(3/2) - (4)I(9/2) transitions2003Ingår i: (Invited) Applied Physics B, Vol. 76, s. 135-141Artikel i tidskrift (Refereegranskat)
  • 76. Bjurshagen, S
    et al.
    Evekull, D
    Koch, R
    RISE., Swedish ICT, Acreo.
    Generation of blue light at 469 nm by efficient frequency doubling of a diode-pumped Nd:YAG laser2002Ingår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 38, s. 324-25Artikel i tidskrift (Refereegranskat)
  • 77. Bjurshagen, S
    et al.
    Koch, R
    RISE., Swedish ICT, Acreo.
    Modeling of energy-transfer upconversion thermal effects in end-pumped quasi-three-level lasers2004Ingår i: Applied Optic, Vol. 43, nr 24, s. 4753-67Artikel i tidskrift (Refereegranskat)
  • 78. Bjurshagen, S
    et al.
    Koch, R
    RISE., Swedish ICT, Acreo.
    Laurell, F
    Quasi-three-level Nd:YAG laser under diode pumping directly into the emitting level2006Ingår i: Optics Communication, Vol. 261, s. 109-13Artikel i tidskrift (Refereegranskat)
  • 79. Blaudeck, T
    et al.
    Andersson Ersman, Peter
    RISE., Swedish ICT, Acreo.
     Sandberg, M
    RISE., Swedish ICT, Acreo.
    Heinz, S
    Laiho, A
     Liu, J
    Engquist, I
    Berggren, M
     Baumann, R R
    Simplified Large-Area Manufacturing of Organic Electrochemical Transistors Combining Printing a Self-Aligning Laser Ablation Step2012Ingår i: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 22, s. 2939-48Artikel i tidskrift (Refereegranskat)
  • 80.
    Blomgren, J
    et al.
    RISE., Swedish ICT, Acreo.
    Eriksson, T
    Tarte, E
    Winkler, D
    Noise properties of an YBCO SQUID2002Ingår i: Physica, Vol. c358, s. 191-Artikel i tidskrift (Refereegranskat)
  • 81.
    Blomgren, J
    et al.
    RISE., Swedish ICT, Acreo.
    Eriksson, T
    Winkler, D
    An HTS SQUID Picovoltmeter with a Flip-Chip Flux Transformer2001Ingår i: IEEE Trans. Appl. Supercond., Vol. 11, s. 892-Artikel i tidskrift (Refereegranskat)
  • 82.
    Blomgren, Jakob
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ahrentorp, Fredrik
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Ilver, Dag
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Jonasson, Christian
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Sepehri, Sobhan
    Chalmers University of Technology, Sweden.
    Kalaboukhov, Alexei
    Chalmers University of Technology, Sweden.
    Winkler, Dag
    Chalmers University of Technology, Sweden.
    de la Torre, Tereza
    Uppsala University, Sweden.
    Strømme, Maria
    Uppsala University, Sweden.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Development of a sensitive induction-based magnetic nanoparticle biodetection method2018Ingår i: Nanomaterials, ISSN 2079-4991, Vol. 8, nr 11, artikel-id 887Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We developed a novel biodetection method for influenza virus based on AC magnetic susceptibility measurement techniques (the DynoMag induction technique) together with functionalized multi-core magnetic nanoparticles. The sample consisting of an incubated mixture of magnetic nanoparticles and rolling circle amplified DNA coils is injected into a tube by a peristaltic pump. The sample is moved as a plug to the two well-balanced detection coils and the dynamic magnetic moment in each position is read over a range of excitation frequencies. The time for making a complete frequency sweep over the relaxation peak is about 5 minutes (10 Hz–10 kHz with 20 data points). The obtained standard deviation of the magnetic signal at the relaxation frequency (around 100 Hz) is equal to about 10−5 (volume susceptibility SI units), which is in the same range obtained with the DynoMag system. The limit of detection with this method is found to be in the range of 1 pM. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.

  • 83.
    Bogren, Sara
    et al.
    RISE., Swedish ICT, Acreo.
    Fornara, Andrea
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Ludwig, Frank
    Technical University of Braunschweig, Germany.
    Del Puerto Morales, Maria
    Instituto de Ciencia de Materiales de Madrid, Spain.
    Steinhoff, Uwe
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Fougt Hansen, Mikkel
    DTU Technical University of Denmark, Denmark.
    Kazakova, Olga
    NPL National Physical Laboratory, UK.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Classification of Magnetic Nanoparticle Systems—Synthesis, Standardization and Analysis Methods in the NanoMag Project2015Ingår i: International Journal of Molecular Sciences, ISSN 1422-0067, E-ISSN 1422-0067, Vol. 16, nr 9, s. 20308-20325Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study presents classification of different magnetic single- and multi-core particle systems using their measured dynamic magnetic properties together with their nanocrystal and particle sizes. The dynamic magnetic properties are measured with AC (dynamical) susceptometry and magnetorelaxometry and the size parameters are determined from electron microscopy and dynamic light scattering. Using these methods, we also show that the nanocrystal size and particle morphology determines the dynamic magnetic properties for both single- and multi-core particles. The presented results are obtained from the four year EU NMP FP7 project, NanoMag, which is focused on standardization of analysis methods for magnetic nanoparticles.

  • 84. Bolin, M
    et al.
    Svennersten, K
    Nilsson, D
    Sawatdee, A
    RISE., Swedish ICT, Acreo.
    Jager, E W H
    Richter-Dahlfors, A
    Berggren, M
    Active Control of Epithelial Cell-Density Gradients Grown Along the Channel of an Organic Electrochemical Transistor2009Ingår i: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 21, s. 4379-82Artikel i tidskrift (Refereegranskat)
  • 85.
    Bosse, Sebastian
    et al.
    Fraunhofer, Germany.
    Brunnstrom, Kjell
    RISE - Research Institutes of Sweden, ICT, Acreo. Mid Sweden University, Sweden.
    Arndt, Sebastian
    NTNU Norwegian University of Science and Technology, Norway.
    Martini, Maria G.
    Kingston University, UK.
    Ramzan, Naeem
    University of the West of Scotland, UK.
    Engelke, Ulrich
    CSIRO, Australia.
    A common framework for the evaluation of psychophysiological visualquality assessment2019Ingår i: Quality and User Experience, ISSN 2366-0139, E-ISSN 2366-0147, Vol. 4, nr 3Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The assessment of perceived quality based on psychophysiological methods recently gained attraction as it potentiallyovercomes certain flaws of psychophysical approaches. Although studies report promising results, it is not possible toarrive at decisive and comparable conclusions that recommend the use of one or another method for a specific applicationor research question. The video quality expert group started a project on psychophysiological quality assessment to studythese novel approaches and to develop a test plan that enables more systematic research. This test plan comprises of a specificallydesigned set of quality annotated video sequences, suggestions for psychophysiological methods to be studied inquality assessment, and recommendations for the documentation and publications of test results. The test plan is presentedin this article.

  • 86. Brewka, L
    et al.
    Gavler, A
    RISE., Swedish ICT, Acreo.
    Wessing, H
    Dittman, L
    Including 10-Gigabit-capable Passive Optical Network under End-to-End Generalized Multi-Protocol Label Switching Provisioned Quality of Service2012Ingår i: Fiber and integrated optics (Print), ISSN 0146-8030, E-ISSN 1096-4681, Vol. 31, nr 2Artikel i tidskrift (Refereegranskat)
  • 87.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Wetter, Göran
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Lövberg, Andreas
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Tegehall, Per-Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Goncalves, Johnny
    NOTE Norrtelje AB, Sweden.
    Söderlund, Jonas
    NOTE Norrtelje AB, Sweden.
    Strandberg, Jan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Kwarnmark, Mikael
    Cogra Pro AB, Sweden.
    Feasibility of PCB-integrated vibration sensors for condition monitoring of electronic systems2018Ingår i: ASME 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, InterPACK 2018, 2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    The increasing complexity of electronics in systems used in safety critical applications, such as for example self-driving vehicles requires new methods to assure the hardware reliability of the electronic assemblies. Prognostics and Health Management (PHM) that uses a combination of data-driven and Physics-of-Failure models is a promising approach to avoid unexpected failures in the field. However, to enable PHM based partly on Physics-of-Failure models, sensor data that measures the relevant environment loads to which the electronics is subjected during its mission life are required. In this work, the feasibility to manufacture and use integrated sensors in the inner layers of a printed circuit board (PCB) as mission load indicators measuring impacts and vibrations has been investigated. A four-layered PCB was designed in which piezoelectric sensors based on polyvinylidenefluoride-co-trifluoroethylene (PVDF-TrFE) were printed on one of the laminate layers before the lamination process. Manufacturing of the PCB was followed by the assembly of components consisting of BGAs and QFN packages in a standard production reflow soldering process. Tests to ensure that the functionality of the sensor material was unaffected by the soldering process were performed. Results showed a yield of approximately 30 % of the sensors after the reflow soldering process. The yield was also dependent on sensor placement and possibly shape. Optimization of the sensor design and placement is expected to bring the yield to 50 % or better. The sensors responded as expected to impact tests. Delamination areas were present in the test PCBs, which requires further investigation. The delamination does not seem to be due to the presence of embedded sensors alone but rather the result of a combination of several factors. The conclusion of this work is that it is feasible to embed piezoelectric sensors in the layers of a PCB.

  • 88.
    Brinkfeldt, Klas
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Wetter, Göran
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Lövberg, Andreas
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Tegehall, Per-Erik
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Strandberg, Jan
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Goncalves, Johnny
    NOTE Norrtelje AB, Sweden.
    Söderlund, Jonas
    NOTE Norrtelje AB, Sweden.
    Kwarnmark, Mikael
    Cogra Pro AB, Sweden.
    Feasibility of Printed Circuit Board-Integrated Vibration Sensors for Condition Monitoring of Electronic Systems2019Ingår i: Journal of Electronic Packaging, ISSN 1043-7398, E-ISSN 1528-9044, Vol. 141, nr 3, artikel-id 031010Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The increasing complexity of electronics in systems used in safety critical applications, such as self-driving vehicles, requires new methods to assure the hardware reliability of the electronic assemblies. Prognostics and health management (PHM) that uses a combination of data-driven and physics-of-failure models is a promising approach to avoid unexpected failures in the field. However, to enable PHM based partly on physics-of-failure models, sensor data that measure the relevant environment loads to which the electronics are subjected during its mission life are required. In this work, the feasibility to manufacture and use integrated sensors in the inner layers of a printed circuit board (PCB) as mission load indicators measuring impacts and vibrations has been investigated. A four-layered PCB was designed in which piezoelectric sensors based on polyvinylidenefluoride-co-trifluoroethylene (PVDF-TrFE) were printed on one of the laminate layers before the lamination process. Manufacturing of the PCB was followed by the assembly of components consisting of ball grid arrays (BGAs) and quad flat no-leads (QFN) packages in a standard production reflow soldering process. Tests to ensure that the functionality of the sensor material was unaffected by the soldering process were performed. Results showed a yield of approximately 30% of the sensors after the reflow soldering process. The yield was also dependent on sensor placement and possibly shape. Optimization of the sensor design and placement is expected to bring the yield to 50% or better. The sensors responded as expected to impact tests. Delamination areas were present in the test PCBs, which requires further investigation. The delamination does not seem to be due to the presence of embedded sensors alone but rather the result of a combination of several factors. The conclusion of this work is that it is feasible to embed piezoelectric sensors in the layers of a PCB.

  • 89.
    Brooke, Robert
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. Linkoping University, Sweden.
    Edberg, Jesper
    RISE - Research Institutes of Sweden, ICT, Acreo. Linkoping University, Sweden.
    Crispin, Xavier
    Linkoping University, Sweden.
    Berggren, Magnus
    Linköping University, Sweden.
    Engquist, Isak
    Linkoping University, Sweden.
    Jonsson, Magnus
    Linkoping University, Sweden.
    Greyscale and paper electrochromic polymer displays by UV patterning2019Ingår i: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, Vol. 11, nr 2, artikel-id 267Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Electrochromic devices have important implications as smart windows for energy efficient buildings, internet of things devices, and in low-cost advertising applications. While inorganics have so far dominated the market, organic conductive polymers possess certain advantages such as high throughput and low temperature processing, faster switching, and superior optical memory. Here, we present organic electrochromic devices that can switch between two high-resolution images, based on UV-patterning and vapor phase polymerization of poly(3,4- ethylenedioxythiophene) films. We demonstrate that this technique can provide switchable greyscale images through the spatial control of a UV-light dose. The color space was able to be further altered via optimization of the oxidant concentration. Finally, we utilized a UV-patterning technique to produce functional paper with electrochromic patterns deposited on porous paper, allowing for environmentally friendly electrochromic displays.

  • 90.
    Brooke, Robert
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Edberg, Jesper
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Girayhan Say, Mehmet
    Linköping University, Sweden.
    Sawatdee, Anurak
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Grimoldi, Andrea
    Linköping University, Sweden.
    Åhlin, Jessica
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Gustafsson, Göran
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Berggren, Magnus
    Linköping University, Sweden.
    Engquist, Isak
    Linköping University, Sweden.
    Supercapacitors on demand: all-printed energy storage devices withadaptable design2019Ingår i: Flexible and Printed Electronics, Vol. 4, nr 1, artikel-id 015006Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Demands on the storage of energy have increased for many reasons, in part driven by householdphotovoltaics, electric grid balancing, along with portable and wearable electronics. These are fastgrowingand differentiated applications that need large volume and/or highly distributed electricalenergy storage, which then requires environmentally friendly, scalable and flexible materials andmanufacturing techniques. However, the limitations on current inorganic technologies have drivenresearch efforts to explore organic and carbon-based alternatives. Here, we report a conductingpolymer:cellulose composite that serves as the active material in supercapacitors which has beenincorporated into all-printed energy storage devices. These devices exhibit a specific capacitance of≈90 F g−1 and an excellent cyclability (>10 000 cycles). Further, a design concept coined ‘supercapacitorson demand’ is presented, which is based on a printing–cutting–folding procedure, thatprovides us with a flexible production protocol to manufacture supercapacitors with adaptableconfiguration and electrical characteristics.

  • 91.
    Brooke, Robert
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Edberg, Jesper
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Say, Mehmet
    Linköping University, Sweden.
    Sawatdee, Anurak
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Grimoldi, Andrea
    RISE - Research Institutes of Sweden, ICT, Acreo. Linköping University, Sweden.
    Åhlin, Jessica
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Gustafsson, Göran
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Berggren, Magnus
    Linköpings University, Sweden.
    Engquist, Isak
    Linköpings University, Sweden.
    Supercapacitors on demand: All-printed energy storage devices with adaptable design2019Ingår i: Flexible and Printed Electronics, ISSN 2058-8585, Vol. 4, nr 1, artikel-id 015006Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Demands on the storage of energy have increased for many reasons, in part driven by household photovoltaics, electric grid balancing, along with portable and wearable electronics. These are fast-growing and differentiated applications that need large volume and/or highly distributed electrical energy storage, which then requires environmentally friendly, scalable and flexible materials and manufacturing techniques. However, the limitations on current inorganic technologies have driven research efforts to explore organic and carbon-based alternatives. Here, we report a conducting polymer:cellulose composite that serves as the active material in supercapacitors which has been incorporated into all-printed energy storage devices. These devices exhibit a specific capacitance of ≈90 F g -1 and an excellent cyclability (>10 000 cycles). Further, a design concept coined 'supercapacitors on demand' is presented, which is based on a printing-cutting-folding procedure, that provides us with a flexible production protocol to manufacture supercapacitors with adaptable configuration and electrical characteristics.

  • 92.
    Brooke, Robert
    et al.
    Linköping University, Sweden.
    Mitraka, Evangelie
    Linköping University, Sweden.
    Sardar, Samim
    Linköping University, Sweden.
    Sandberg, Mats
    RISE - Research Institutes of Sweden, ICT, Acreo. Linköping University, Sweden.
    Sawatdee, Anurak
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Berggren, Magnus
    RISE - Research Institutes of Sweden, ICT, Acreo. Linköping University, Sweden.
    Crispin, Xavier
    Linköping University, Sweden.
    Jonsson, Magnus P.
    Linköping University, Sweden.
    Infrared electrochromic conducting polymer devices2017Ingår i: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 5, nr 23, s. 5824-5830Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) is well known for its electrochromic properties in the visible region. Less focus has been devoted to the infrared (IR) wavelength range, although tunable IR properties could enable a wide range of novel applications. As an example, modern day vehicles have thermal cameras to identify pedestrians and animals in total darkness, but road and speed signs cannot be easily visualized by these imaging systems. IR electrochromism could enable a new generation of dynamic road signs that are compatible with thermal imaging, while simultaneously providing contrast also in the visible region. Here, we present the first metal-free flexible IR electrochromic devices, based on PEDOT:Tosylate as both the electrochromic material and electrodes. Lateral electrochromic devices enabled a detailed investigation of the IR electrochromism of thin PEDOT:Tosylate films, revealing large changes in their thermal signature, with effective temperature changes up to 10 °C between the oxidized (1.5 V) and reduced (-1.5 V) states of the polymer. Larger scale (7 × 7 cm) vertical electrochromic devices demonstrate practical suitability and showed effective temperature changes of approximately 7 °C, with good optical memory and fast switching (1.9 s from the oxidized state to the reduced state and 3.3 s for the reversed switching). The results are highly encouraging for using PEDOT:Tosylate for IR electrochromic applications.

  • 93. Brotherton, M D
    et al.
    Huynh-Thu, Q
    Hands, D
    Brunnström, K
    RISE., Swedish ICT, Acreo.
    Subjective Multimedia Quality Assessment2006Ingår i: IEICE Transactions on Fundamentals of Electronics Communications Computer Sciences, Vol. E89, nr a11, s. 2920-2932Artikel i tidskrift (Refereegranskat)
  • 94. Brunetti, AC
    et al.
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Rottwitt, K
    Raman probes based on optically-poled double-clad fiber coupler2012Ingår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, nr 27Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Two fiber Raman probes are presented, one based on an optically-poled double-clad fiber the second based on an opticallypoled double-clad fiber coupler respectively. Optical poling of the core of the fiber allows for the generation of enough 532nm light to perform Raman spectroscopy of a sample of dimethyl sulfoxide (DMSO), when illuminating the waveguide with 1064nm laser light. The Raman signal is collected in the inner cladding, from which it is retrieved with either a bulk dichroic mirror or a double-clad fiber coupler. The coupler allows for a substantial reduction of the fiber spectral background signal conveyed to the spectrometer._x000D_ Full text_x000D_

  • 95.
    Brunnstrom, Kjell
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. Mid Sweden University, Sweden.
    Barkowsky, Marcus
    University of Applied Sciences, Germany.
    Statistical quality of experience analysis: on planning the sample size and statistical significance testing2018Ingår i: Journal of Electronic Imaging (JEI), ISSN 1017-9909, E-ISSN 1560-229X, Vol. 27, nr 5, artikel-id 053013Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper analyzes how an experimenter can balance errors in subjective video quality tests betweenthe statistical power of finding an effect if it is there and not claiming that an effect is there if the effect is not there,i.e., balancing Type I and Type II errors. The risk of committing Type I errors increases with the number ofcomparisons that are performed in statistical tests. We will show that when controlling for this and at thesame time keeping the power of the experiment at a reasonably high level, it is unlikely that the number oftest subjects that are normally used and recommended by the International Telecommunication Union (ITU),i.e., 15 is sufficient but the number used by the Video Quality Experts Group (VQEG), i.e., 24 is more likelyto be sufficient. Examples will also be given for the influence of Type I error on the statistical significance ofcomparing objective metrics by correlation. We also present a comparison between parametric and nonparametricstatistics. The comparison targets the question whether we would reach different conclusions on the statisticaldifference between the video quality ratings of different video clips in a subjective test, based on thecomparison between the student T-test and the Mann–Whitney U-test. We found that there was hardly a differencewhen few comparisons are compensated for, i.e., then almost the same conclusions are reached. Whenthe number of comparisons is increased, then larger and larger differences between the two methods arerevealed. In these cases, the parametric T-test gives clearly more significant cases, than the nonparametrictest, which makes it more important to investigate whether the assumptions are met for performing a certaintest.

  • 96.
    Brunnstrom, Kjell
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. Mid Sweden University, Sweden.
    Dima, Elijs
    Mid Sweden University, Sweden.
    Andersson, Mattias
    Mid Sweden University, Sweden.
    Sjöström, Mårten
    Mid Sweden University, Sweden.
    Qureshi, Tahir
    HIAB, Sweden.
    Johanson, Mathias
    Alkit Communications AB, Sweden.
    Quality of Experience of hand controller latency in a Virtual Reality simulator2019Ingår i: Human Vision and Electronic Imaging 2019 / [ed] Damon Chandler, Mark McCourt and Jeffrey Mulligan, 2019, artikel-id 3068450Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this study, we investigate a VR simulator of a forestry crane used for loading logs onto a truck, mainly looking at Quality of Experience (QoE) aspects that may be relevant for task completion, but also whether there are any discomfort related symptoms experienced during task execution. A QoE test has been designed to capture both the general subjective experience of using the simulator and to study task performance. Moreover, a specific focus has been to study the effects of latency on the subjective experience, with regards to delays in the crane control interface. A formal subjective study has been performed where we have added controlled delays to the hand controller (joystick) signals. The added delays ranged from 0 ms to 800 ms. We found no significant effects of delays on the task performance on any scales up to 200 ms. A significant negative effect was found for 800 ms added delay. The Symptoms reported in the Simulator Sickness Questionnaire (SSQ) was significantly higher for all the symptom groups, but a majority of the participants reported only slight symptoms. Two out of thirty test persons stopped the test before finishing due to their symptoms.

  • 97.
    Brunnstrom, Kjell
    et al.
    RISE., Swedish ICT, Acreo.
    Tavakoli, S
    Kulyk, V
    RISE., Swedish ICT, Acreo.
    Wang, Kun
    RISE., Swedish ICT, Acreo.
    Hedberg, Christer
    RISE., Swedish ICT, Acreo.
    Ananth, IV
    RISE., Swedish ICT, Acreo.
    Hussein, M
    RISE., Swedish ICT, Acreo.
    Andrén, B
    RISE., Swedish ICT, Acreo.
    Folkesson, M
    Barowski, M
    RISE., Swedish ICT, Acreo.
    3D Video Quality of Experience - Influence of Scale and Crosstalk Invited2014Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper gives an overview of three recent studies by the authors on the topic of 3D video Quality of Experience (QoE). Two of studies [1,2] investigated different psychological dimension that may be needed for describing 3D video QoE and the third the visibility and annoyance of crosstalk[3]. The results shows that the video quality scale could be sufficient for evaluating S3D video experience for coding and spatial resolution reduction distortions. It was also confirmed that with a more complex mixture of degradations more than one scale should be used to capture the QoE in these cases. The study found a linear relationship between the perceived crosstalk and the amount of crosstalk.

  • 98.
    Brunnstrom, Kjell
    et al.
    RISE., Swedish ICT, Acreo. Mid Sweden University, Sweden.
    Tavakoli, Samira
    Technical University of Madrid, Spain.
    Søgaard, Jacob
    DTU Technical University of Denmark, Denmark.
    Compensating for Type-I errors in video quality assessment2015Ingår i: 2015 Seventh International Workshop on Quality of Multimedia Experience (QoMEX), 2015, artikel-id 7148080Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper analyzes the impact on compensating for Type-I errors in video quality assessment. A Type-I error is to incorrectly conclude that there is an effect. The risk increases with the number of comparisons that are performed in statistical tests. Type-I errors are an issue often neglected in Quality of Experience and video quality assessment analysis. Examples are given for the analysis of subjective experiments and the evaluation of objective metrics by correlation.

  • 99.
    Brunnstrom, Kjell
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo. Mid Sweden University, Sweden.
    Wang, Kun
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Tavakoli, Samira
    Universidad Politecnica de Madrid, Spain.
    Andren, Börje
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Symptoms analysis of 3D TV viewing based on Simulator SicknessQuestionnaires2017Ingår i: Quality and User Experience, ISSN 2366-0139, E-ISSN 2366-0147, Vol. 2Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Stereoscopic 3D TV viewing puts differentvisual demands on the viewer compared to 2D TV viewing.Previous research has reported on viewers’ fatigue anddiscomfort and other negative effects. This study is toinvestigate further how severe and what symptoms mayarise from somewhat longish 3D TV viewing. The MPEG3DV project is working on the next-generation videoencoding standard and in this process, MPEG issued a callfor proposal of encoding algorithms. To evaluate thesealgorithms a large scale subjective test was performedinvolving Laboratories all over the world [(MPEG 2011;Baroncini 2012)]. For the participating Labs, it wasoptional to administer a slightly modified Simulator SicknessQuestionnaire (SSQ) before and after the test. One ofthe SSQ data sets described in this article is coming fromthis study. The SSQ data from the MPEG test is the largestdata set in this study and also contains the longest viewingtimes. Along with the SSQ data from the MPEG test, wehave also collected questionnaire data in three other 3D TVstudies. We did two on the same 3D TV (passive filmpattern retarder) as in the MPEG test, and one was using aprojector system. As comparison SSQ data from a 2Dvideo quality experiment is also presented. This investigationshows a statistically significant increase in symptomsafter viewing 3D TV primarily related to the visual or Oculomotor system. Surprisingly, 3D video viewing usingprojectors did not show this effect.

  • 100. Brunnström, K
    et al.
    Nordström, L
    Andren, B
    RISE., Swedish ICT, Acreo.
    Visual experience of quality degradation when viewing computer notebooks displays from an oblique angle2011Ingår i: Journal of the Society for Information Display, ISSN 1071-0922, E-ISSN 1938-3657, Vol. 19, nr 5, s. 387-Artikel i tidskrift (Refereegranskat)
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