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  • 151.
    Ahmadkhaniha, D.
    et al.
    Jönköping University, Sweden.
    Eriksson, F.
    Linköping University, Sweden.
    Leisner, Peter
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik. Jönköping University, Sweden.
    Zanella, C.
    Jönköping University, Sweden.
    Effect of SiC particle size and heat-treatment on microhardness and corrosion resistance of NiP electrodeposited coatings2018Inngår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 769, s. 1080-1087Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Electrodeposition of NiP composite coatings with nano and sub-micron sized SiC has been carried out to investigate the possibility of replacing hard chromium coatings. The composition and structure of the coatings were evaluated by energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. Microhardness was measured by Vickers indentation and polarization measurements were carried out to study the corrosion behavior of the coatings. The results showed that submicron particles can be codeposited with a higher content as compared to nano sized ones. However, even if a smaller amount of the nano-sized SiC particles are incorporated in the coating, the contribution to an increasing microhardness was comparable with the submicron sized particles, which can be related to the higher density of codeposited particles. SiC particles did not change the anodic polarization behavior of NiP coatings in a 3.5% NaCl solution. Finally, the effect of heat-treatment on the coatings properties at 400 °C for 1 h was studied to investigate the contribution of particles and heat-treatment on hardness and corrosion properties. It was found that the heat-treatment doubled the microhardness and changed the anodic polarization behavior of the coatings from passive to active with respect to the as-plated conditions.

  • 152.
    Ahmed, Mobyen
    et al.
    Mälardalen University, Sweden.
    Andersson, Peter
    Mälardalen University, Sweden.
    Andersson, Tim
    Mälardalen University, Sweden.
    Aparicio, Elena
    Mälardalen University, Sweden; Mälarenergi AB, Sweden.
    Baaz, Hampus
    Mälardalen University, Sweden.
    Barua, Shaibal
    RISE - Research Institutes of Sweden, ICT, SICS. Mälardalen University, Sweden.
    Bergström, Albert
    Mälardalen University, Sweden.
    Bengtsson, Daniel
    Mälardalen University, Sweden.
    Orisio, Daniele
    State Institute of Higher Education "Guglielmo Marconi", Italy.
    Skvaril, Jan
    Mälardalen University, Sweden.
    Zambrano, Jesus
    Mälardalen University, Sweden.
    A machine learning approach for biomass characterization2019Inngår i: Energy Procedia, Elsevier Ltd , 2019, s. 1279-1287Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aim of this work is to apply and evaluate different chemometric approaches employing several machine learning techniques in order to characterize the moisture content in biomass from data obtained by Near Infrared (NIR) spectroscopy. The approaches include three main parts: a) data pre-processing, b) wavelength selection and c) development of a regression model enabling moisture content measurement. Standard Normal Variate (SNV), Multiplicative Scatter Correction and Savitzky-Golay first (SG1) and second (SG2) derivatives and its combinations were applied for data pre-processing. Genetic algorithm (GA) and iterative PLS (iPLS) were used for wavelength selection. Artificial Neural Network (ANN), Gaussian Process Regression (GPR), Support Vector Regression (SVR) and traditional Partial Least Squares (PLS) regression, were employed as machine learning regression methods. Results shows that SNV combined with SG1 first derivative performs the best in data pre-processing. The GA is the most effective methods for variable selection and GPR achieved a high accuracy in regression modeling while having low demands on computation time. Overall, the machine learning techniques demonstrate a great potential to be used in future NIR spectroscopy applications. © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of ICAE2018 - The 10th International Conference on Applied Energy.

  • 153.
    Ahmed, Mobyen Uddin
    et al.
    Mälardalen University, Sweden.
    Fotouhi, Hossein
    Mälardalen University, Sweden.
    Köckemann, Uew
    Örebro University, Sweden.
    Lindén, Maria
    Mälardalen University, Sweden.
    Tomasic, Ivan
    Mälardalen University, Sweden.
    Tsiftes, Nicolas
    RISE - Research Institutes of Sweden, ICT, SICS.
    Voigt, Thiemo
    RISE - Research Institutes of Sweden, ICT, SICS.
    Run-Time Assurance for the E-care@home System2018Inngår i: Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 225), 2018, s. 107-110Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents the design and implementation of the software for a run-time assurance infrastructure in the E-care@home system. An experimental evaluation is conducted to verify that the run-time assurance infrastructure is functioning correctly, and to enable detecting performance degradation in experimental IoT network deployments within the context of E-care@home. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

  • 154.
    Ahmed, Mobyen Uddin
    et al.
    Mälardalen University, Sweden.
    Fotouhi, Hossein
    Mälardalen University, Sweden.
    Köckemann, Uwe
    Örebro University, Sweden.
    Lindén, Maria
    Mälardalen University, Sweden.
    Tomasic, Ivan
    Mälardalen University, Sweden.
    Tsiftes, Nicolas
    RISE - Research Institutes of Sweden, ICT, SICS.
    Voigt, Thiemo
    RISE - Research Institutes of Sweden, ICT, SICS.
    Run-Time Assurance for the E-care@home System2017Inngår i: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, 2017, Vol. 225, s. 107-110Konferansepaper (Fagfellevurdert)
  • 155.
    Ahmed, Saad
    et al.
    Lahore University of Management Sciences, Pakistan .
    Bakar, A.
    Lahore University of Management Sciences, Pakistan .
    Bhatti, Naveed
    RISE - Research Institutes of Sweden, ICT, SICS.
    Alizai, M
    Lahore University of Management Sciences, Pakistan .
    Siddiqui, J. H.
    Lahore University of Management Sciences, Pakistan .
    Mottola, Luca
    RISE - Research Institutes of Sweden, ICT, SICS. Politecnico di Milano, Italy.
    The betrayal of constant power × time: Finding the missing joules of transiently-powered computers2019Inngår i: Proceedings of the ACM SIGPLAN Conference on Languages, Compilers, and Tools for Embedded Systems (LCTES), Association for Computing Machinery , 2019, s. 97-109Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Transiently-powered computers (TPCs) lay the basis for a battery-less Internet of Things, using energy harvesting and small capacitors to power their operation. This power supply is characterized by extreme variations in supply voltage, as capacitors charge when harvesting energy and discharge when computing. We experimentally find that these variations cause marked fluctuations in clock speed and power consumption, which determine energy efficiency. We demonstrate that it is possible to accurately model and concretely capitalize on these fluctuations. We derive an energy model as a function of supply voltage and develop EPIC, a compile-time energy analysis tool. We use EPIC to substitute for the constant power assumption in existing analysis techniques, giving programmers accurate information on worst-case energy consumption of programs. When using EPIC with existing TPC system support, run-time energy efficiency drastically improves, eventually leading up to a 350% speedup in the time to complete a fixed workload. Further, when using EPIC with existing debugging tools, programmers avoid unnecessary program changes that hurt energy efficiency.

  • 156.
    Ahmed, Saad
    et al.
    Lahore University of Management Sciences, Pakistan .
    Bhatti, Nayeed
    RISE - Research Institutes of Sweden, ICT, SICS.
    Alizai, Muhammad
    Lahore University of Management Sciences, Pakistan .
    Siddiqui, Junaid
    Lahore University of Management Sciences, Pakistan .
    Mottola, Luca
    RISE - Research Institutes of Sweden, ICT, SICS. Politecnico di Milano, Italy.
    Efficient intermittent computing with differential checkpointing2019Inngår i: Proceedings of the ACM SIGPLAN Conference on Languages, Compilers, and Tools for Embedded Systems (LCTES), Association for Computing Machinery , 2019, s. 70-81Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Embedded devices running on ambient energy perform computations intermittently, depending upon energy availability. System support ensures forward progress of programs through state checkpointing in non-volatile memory. Checkpointing is, however, expensive in energy and adds to execution times. To reduce this overhead, we present DICE, a system design that efficiently achieves differential checkpointing in intermittent computing. Distinctive traits of DICE are its software-only nature and its ability to only operate in volatile main memory to determine differentials. DICE works with arbitrary programs using automatic code instrumentation, thus requiring no programmer intervention, and can be integrated with both reactive (Hibernus) or proactive (MementOS, HarvOS) checkpointing systems. By reducing the cost of checkpoints, performance markedly improves. For example, using DICE, Hibernus requires one order of magnitude shorter time to complete a fixed workload in real-world settings.

  • 157.
    Ahniyaz, Anwar
    et al.
    Stockholm University, Sweden.
    Seisenbaeva, Gulaim A.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Häggström, Lennart
    Uppsala University, Sweden.
    Kamali, Saeed
    Uppsala University, Sweden.
    Kessler, Vadim G.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Nordblad, Per
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Bergström, Lennart
    Stockholm University, Sweden.
    Preparation of iron oxide nanocrystals by surfactant-free or oleic acid-assisted thermal decomposition of a Fe(III) alkoxide2008Inngår i: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 320, s. 781-787Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A new non-hydrolytic, alkoxide-based route was developed to synthesize iron oxide nanocrystals. Surfactant-free thermal decomposition of the iron 2-methoxy-ethoxide precursors results in the formation of uniform iron oxide nanocrystals with an average size of 5.6 nm. Transmission electron microscope study shows that the nanocrystals are protected against aggregation by a repulsive surface layer, probably originating from the alkoxy-alkoxide ligands. Addition of oleic acid resulted in monodisperse nanocrystals with an average size of 4 nm. Mössbauer analysis confirmed that the nanocrystals mainly consisted of maghemite. Analysis of the magnetic hysteresis loop measurements and the zero field and field cooled measurements displayed an excellent fit to established theories for single-domain superparamagnetic nanocrystals and the size of the magnetic domains correlated well to the crystallite size obtained from transmission electron microscope.

  • 158.
    Ahrentorp, F.
    et al.
    RISE., Swedish ICT, Acreo.
    Astalan, A. P.
    Jonasson, Christian
    RISE., Swedish ICT, Acreo.
    Blomgren, J.
    RISE., Swedish ICT, Acreo.
    Qi, B.
    Thompson Mefford, O.
    Yan, M.
    Courtois, J.
    Berret, J. F.
    Fresnais, J.
    Sandre, O.
    Dutz, S.
    Muller, R.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Sensitive High Frequency AC Suceptometry in Magnetic Nanoparticle Applications2010Inngår i: AIP Conference Proceedings, Vol. 1311, s. 213-23Artikkel i tidsskrift (Fagfellevurdert)
  • 159.
    Ahrentorp, Fredrik
    et al.
    RISE., Swedish ICT, Acreo.
    Astalan, Andrea
    RISE., Swedish ICT, Acreo.
    Blomgren, Jakob
    RISE., Swedish ICT, Acreo.
    Jonasson, Christian
    RISE., Swedish ICT, Acreo.
    Wetterskog, Erik
    Uppsala University, Sweden.
    Svedlindh, Peter
    Uppsala University, Sweden.
    Lak, Aidin
    Technical University of Braunschweig, Germany.
    Ludwig, Frank
    Technical University of Braunschweig, Germany.
    van Ijzendoorn, Leo J.
    Eindhoven University of Technology, The Netherlands.
    Westphal, Fritz
    Micromod Partikeltechnologie GmbH, Germany.
    Gruttner, Cordula
    Micromod Partikeltechnologie GmbH, Germany.
    Gehrke, Nicole
    nanoPET Pharma GmbH, Germany.
    Gustafsson, Stefan
    Chalmers University of Technology, Sweden.
    Olsson, Eva
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE., Swedish ICT, Acreo.
    Effective particle magnetic moment of multi-core particles2015Inngår i: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 380, s. 221-226Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study we investigate the magnetic behavior of magnetic multi-core particles and the differences in the magnetic properties of multi-core and single-core nanoparticles and correlate the results with the nanostructure of the different particles as determined from transmission electron microscopy(TEM). We also investigate how the effective particle magnetic moment is coupled to the individual moments of the single-domain nanocrystals by using different measurement techniques: DC magnetometry, AC susceptometry, dynamic light scattering and TEM. We have studied two magnetic multi-core particle systems – BNF Starch from Micromod with a median particle diameter of 100 nm and FeraSpin R from nanoPET with a median particle diameter of 70 nm – and one single-core particle system – SHP25 from Ocean NanoTech with a median particle core diameter of 25 nm.

  • 160.
    Ahrentorp, Fredrik
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Blomgren, Jakob
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Jonasson, Christian
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Sarwe, Anna
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Sepehri, Sobhan
    Chalmers University of Technology, Sweden.
    Eriksson, Emil
    Chalmers University of Technology, Sweden.
    Kalaboukhov, Alexei
    Chalmers University of Technology, Sweden.
    Jesorka, Aldo
    Chalmers University of Technology, Sweden.
    Winkler, Dag
    Chalmers University of Technology, Sweden.
    Schneiderman, Justin F.
    University of Gothenburg, Sweden.
    Nilsson, Mats
    Stockholm University, Sweden.
    Albert, Jan
    Karolinska University Hospital, Sweden; Karolinska Institute, Sweden.
    de la Torre, Theresa Z. G.
    Uppsala University, Sweden.
    Strømme, Maria
    Uppsala University, Sweden.
    Johansson, Christer
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Sensitive magnetic biodetection using magnetic multi-core nanoparticles and RCA coils2017Inngår i: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 427, s. 14-18Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We use functionalized iron oxide magnetic multi-core particles of 100 nm in size (hydrodynamic particle diameter) and AC susceptometry (ACS) methods to measure the binding reactions between the magnetic nanoparticles (MNPs) and bio-analyte products produced from DNA segments using the rolling circle amplification (RCA) method. We use sensitive induction detection techniques in order to measure the ACS response. The DNA is amplified via RCA to generate RCA coils with a specific size that is dependent on the amplification time. After about 75 min of amplification we obtain an average RCA coil diameter of about 1 µm. We determine a theoretical limit of detection (LOD) in the range of 11 attomole (corresponding to an analyte concentration of 55 fM for a sample volume of 200 µL) from the ACS dynamic response after the MNPs have bound to the RCA coils and the measured ACS readout noise. We also discuss further possible improvements of the LOD.

  • 161.
    Aicher, Simon mfl
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Determination of fracture energy of wood in Mode II. RILEM TC 133 Report.1997Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 162.
    Aitomäki, Yvonne
    et al.
    RISE., Swerea, SICOMP.
    Hagström, Bengt
    RISE., Swerea, IVF.
    Långström, Runar
    RISE., Swerea, SICOMP.
    Fernberg, Patrik
    RISE., Swerea, SICOMP.
    Novel reactive bicomponent fibres: Material in composite manufacturing2012Inngår i: Journal of Nanostructured Polymers and Nanocomposites, ISSN 1790-4439, Vol. 8, nr 1, s. 5-11Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 163.
    Ajpi, Cesario
    et al.
    Universidad Mayor de San Andres, Bolivia.
    Suescun, Leopoldo
    Universidad de la Republica, Uruguay.
    Leiva, Naviana
    Universidad Mayor de San Andres, Bolivia.
    Lundblad, Anders Olof
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Elektronik.
    Lindbergh, Göran
    KTH Royal Institute of Technology, Sweden.
    Cabrera, Saul
    Universidad Mayor de San Andres, Bolivia.
    Crystal structure and Hirshfeld surface analysis of poly[tris-(μ4-benzene-1,4-di-carboxyl-ato)tetra-kis-(di-methyl-formamide)-trinickel(II)]: a two-dimensional coordination network.2019Inngår i: Acta crystallographica. Section E, Crystallographic communications, ISSN 2056-9890, Vol. 75, nr Pt 12, s. 1839-1843Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The crystal structure of the title compound, [Ni3(C8H4O4)3(C3H7NO)4], is a two-dimensional coordination network formed by trinuclear linear Ni3(tp)3(DMF)4 units (tp = terephthalate = benzene-1,4-di-carboxyl-ate and DMF = di-methyl-formamide) displaying a characteristic coordination mode of acetate groups in polynuclear metal-organic compounds. Individual trinuclear units are connected through tp anions in a triangular network that forms layers. One of the DMF ligands points outwards and provides inter-actions with equivalent planes above and below, leaving the second ligand in a structural void much larger than the DMF mol-ecule, which shows positional disorder. Parallel planes are connected mainly through weak C-H⋯O, H⋯H and H⋯C inter-actions between DMF mol-ecules, as shown by Hirshfeld surface analysis.

  • 164.
    Akbari, Saaed
    et al.
    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.
    Brinkfeldt, Klas
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Andersson, Dag
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF AB.
    Effect of PCB cracks on thermal cycling reliability of passive microelectronic components with single-grained solder joints2019Inngår i: Microelectronics and reliability, ISSN 0026-2714, E-ISSN 1872-941X, Vol. 93, s. 61-71Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lead-free tin-based solder joints often have a single-grained structure with random orientation and highly anisotropic properties. These alloys are typically stiffer than lead-based solders, hence transfer more stress to printed circuit boards (PCBs) during thermal cycling. This may lead to cracking of the PCB laminate close to the solder joints, which could increase the PCB flexibility, alleviate strain on the solder joints, and thereby enhance the solder fatigue life. If this happens during accelerated thermal cycling it may result in overestimating the lifetime of solder joints in field conditions. In this study, the grain structure of SAC305 solder joints connecting ceramic resistors to PCBs was studied using polarized light microscopy and was found to be mostly single-grained. After thermal cycling, cracks were observed in the PCB under the solder joints. These cracks were likely formed at the early stages of thermal cycling prior to damage initiation in the solder. A finite element model incorporating temperature-dependant anisotropic thermal and mechanical properties of single-grained solder joints is developed to study these observations in detail. The model is able to predict the location of damage initiation in the PCB and the solder joints of ceramic resistors with reasonable accuracy. It also shows that the PCB cracks of even very small lengths may significantly reduce accumulated creep strain and creep work in the solder joints. The proposed model is also able to evaluate the influence of solder anisotropy on damage evolution in the neighbouring (opposite) solder joints of a ceramic resistor.

  • 165.
    Akbari, Saeed
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Sakhaei, A. H.
    Singapore University of Technology and Design, Singapore; University of Exeter, UK.
    Panjwani, S.
    Singapore University of Technology and Design, Singapore.
    Kowsari, K.
    Singapore University of Technology and Design, Singapore.
    Serjourei, A.
    Singapore University of Technology and Design, Singapore.
    Ge, Q.
    Singapore University of Technology and Design, Singapore.
    Multimaterial 3D Printed Soft Actuators Powered by Shape Memory Alloy Wires2019Inngår i: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 290, s. 177-189Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Shape memory alloys (SMAs) have been widely used to fabricate soft actuators by embedding SMA wires into various soft matrices manufactured by conventional moulding methods or novel three-dimensional (3D) printing techniques. However, soft matrices of SMA based actuators are typically fabricated from only one or two different materials. Here, we exploit the great manufacturing flexibility of multimaterial 3D printing to fabricate various bending, twisting and extensional actuators by precisely controlling the spatial arrangements of different printing materials with different stiffnesses. In order to achieve a broad range of deformations, ten different printing materials were characterized and used in the actuators design. In addition, we developed a finite element model to simulate complex deformations of the printed actuators and facilitate the design process. The model incorporates a user defined material subroutine that describes the nonlinear temperature dependant behavior of SMAs. The results show the efficiency and flexibility of multimaterial 3D printing in tailoring the deformed shape of the SMA based soft actuators, which cannot be accomplished using conventional manufacturing methods such as moulding.

  • 166.
    Akesson, Karl Petter
    et al.
    RISE., Swedish ICT, SICS.
    Nilsson, Andreas
    RISE., Swedish ICT, Viktoria.
    Designing leisure applications for the mundane car-commute2002Inngår i: Personal and Ubiquitous Computing, ISSN 1617-4909, E-ISSN 1617-4917, Vol. 6, nr 3, s. 176-187Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

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

  • 167.
    Al Nahas, Beshr
    RISE, Swedish ICT, SICS. Department of Information Technology.
    Multichannel Communication in Contiki's Low-power IPv6 Stack2013Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    Vast majority of wireless appliances used in household, industry and medical field share the ISM frequency band. These devices need to coexist and thus are challenged to tolerate their mutual interference. One way of dealing with this is by using frequency hopping; where the device changes its radio channel periodically. Consequently, communications will not suffer from the same interference each time; instead, it should be fairer and more stable. This thesis investigates the aforementioned problem in the field of low power wireless sensor networks and Internet of Things where Contiki OS is used. We introduce a low-power pseudo-random frequency-hopping MAC protocol which is specifically characterized as a duty cycled asynchronous sender-initiated LPL style protocol. We illustrate two flavors of the protocol; one that does not use any dedicated channel and another which allows dedicated broadcast channels that can implement frequency-hopping as well. We implement the protocol in C for real hardware and extensively test and evaluate it in a simulated environment which runs Contiki. It proved to work with Contiki's IPv6 stack running RPL (the standardized routing protocol for low power and lossy wireless networks). We compare the performance of the implemented protocol to the singlechannel ContikiMAC with varying levels of interference. Results show a reduction down to 56% less radio-on time (1.50% vs. 3.4%) and 85% less latency (306 ms vs. 2050 ms) in the presence of noise, while keeping a good basecost in noise-free environments with 1.29% radio duty cycle when using 9 channels with no dedicated broadcast channels (vs. 0.80% for single channel) and 252 ms average latency(vs. 235 ms). Moreover, the results show that the multichannel protocol performance metrics converge to almost the same values regardless of the noise level. Therefore, it is recommended as a good alternative to single channel ContikiMAC in realworld deployments where noise presence is anticipated.

    Fulltekst (pdf)
    FULLTEXT01
  • 168.
    Al Nahas, Beshr
    et al.
    RISE., Swedish ICT, SICS.
    Duquennoy, Simon
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Iyer, Venkatraman
    Voigt, Thiemo
    RISE., Swedish ICT, SICS, Computer Systems Laboratory.
    Low-Power Listening Goes Multi-Channel2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Exploiting multiple radio channels for communication has been long known as a practical way to mitigate interference in wireless settings. In Wireless Sensor Networks, however, multi-channel solutions have not reached their full potential: the MAC layers included in TinyOS or the Contiki OS for example are mostly single-channel. The literature offers a number of interesting solutions, but experimental results were often too few to build confidence. We propose a practical extension of low-power listening, MiCMAC, that performs channel hopping, operates in a distributed way, and is independent of upper layers of the protocol stack. The above properties make it easy to deploy in a variety of scenarios, without any extra configuration/scheduling/channel selection hassle. We implement our solution in Contiki and evaluate it in a 97-node testbed while running a complete, out-of-the-box low-power IPv6 communication stack (UDP/RPL/6LoWPAN). Our experimental results demonstrate increased resilience to emulated WiFi interference (e.g., data yield kept above 90% when ContikiMAC drops in the 40% range). In noiseless environments, MiCMAC keeps the overhead low in comparison to ContikiMAC, achieving performance as high as 99% data yield along with sub-percent duty cycle and sub-second latency for a 1-minute inter-packet interval data collection.

    Fulltekst (pdf)
    fulltext
  • 169.
    Al Nahas, Beshr
    et al.
    Chalmers University of Technology, Sweden.
    Duquennoy, Simon
    RISE - Research Institutes of Sweden, ICT, SICS.
    Landsiedel, Olaf
    Chalmers University of Technology, Sweden.
    Network Bootstrapping and Leader Election in Low-power Wireless Networks2017Inngår i: Proceedings of the International Conference on Embedded Networked Sensor Systems (ACM SenSys 2017), November 5-8, 2017, Delft, The Netherlands, ACM Press, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Many protocols in low-power wireless networks require a leader to bootstrap and maintain their operation. For example, Chaos and Glossy networks need an initiator to synchronize and initiate the communication rounds. Commonly, these protocols use a fixed, compile-time defined node as the leader. In this work, we tackle the challenge of dynamically bootstrapping the network and electing a leader in low-power wireless scenarios.

  • 170.
    Al Nahas, Beshr
    et al.
    Chalmers University of Technology, Sweden.
    Duquennoy, Simon
    RISE - Research Institutes of Sweden, ICT, SICS.
    Landsiedel, Olaf
    Chalmers University of Technology, Sweden.
    Network-wide Consensus Utilizing the Capture Eect in Low-power Wireless Networks2017Inngår i: Proceedings of the International Conference on Embedded Networked Sensor Systems (ACM SenSys 2017), November 5-8, 2017, Delft, The Netherlands, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Many protocols in low-power wireless networks require a root nodeor a leader to bootstrap and maintain its operation. For example,Chaos and Glossy networks need an initiator to synchronize andinitiate the communications rounds. Commonly, these protocolsuse a xed, compile-time dened node as the leader. In this work,we tackle the challenge of dynamically bootstrapping the networkand electing a leader in low-power wireless scenarios, and we focuson Chaos-style networks

    Fulltekst (pdf)
    fulltext
  • 171.
    Al Suhairy, Sinan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Sveriges tekniska forskningsinstitut / Akustik (Eta).
    Prediction of ground vibration from railways. Master of Science thesis, Department of Applied Acoustics, Chalmers University of Technology2000Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 172.
    Alakärppä, Ismo
    et al.
    University of Lapland, Finland.
    Riekki, Jukka
    University of Oulu, Finland.
    Larsson, Sofia
    RISE., Swedish ICT, Interactive Institute.
    Jaakkola, Elisa
    University of Lapland, Finland.
    Sound Aided Interface of a Pervasive Pain Monitoring System2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We have developed a new version of a pervasive system for monitoring and recording subjective pain experiences. The most important service the system offers to its users is real-time delivery of reported pain values from patients to nurses. Pain experiences are expressed on a six-value scale from "no pain" to "worst possible pain". The system was tested in four sessions with 23 test users from Finland and Sweden. The main goal of this study was to evaluate user experience of the patient application and the sounds we designed for the user interface. We tested four sound options; spoken, synthetic, xylophone and mute. The material was collected through group discussions and questionnaires. Familiarity, the extent to which a sound can be identified, and the quality and the pleasantness of the sound were found to have an effect on forming a positive experience. Sounds describing pain levels have to be convincing. The context of use has to be taken into account as a primary design driver in a sound design process.

  • 173. Alander, J
    et al.
    Wärnheim, T
    YKI – Ytkemiska institutet.
    Model microemulsions containing vegetable oils Part 1: Nonionic surfactant systems1989Inngår i: Journal of the American Oil Chemists Society, ISSN 0003-021X, E-ISSN 1558-9331, Vol. 66, s. 1656-1660Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Nonionic microemulsions containing triglucerides and fatty acid esters as lipophilic components have been studied. The phase inversion temperature (PIT) of the systems was determined by a conductometric method. Partial phase diagrams were constructed in the phase inversion temperature range. Water solubilization capacity of the nonionic surfactant systems studied was dependent on surfactant and oil types in analogy to ordinary hydrocarbon systems. The PIT:s increased with increased molecular weight for both esters and triglycerides.

  • 174. Alander, J
    et al.
    Wärnheim, T
    YKI – Ytkemiska institutet.
    Model microemulsions containing vegetable oils Part 2: Ionic surfactant systems1989Inngår i: Journal of the American Oil Chemists Society, ISSN 0003-021X, E-ISSN 1558-9331, Vol. 66, s. 1661-1665Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The phase behavior and the structure of ionic microemulsions, stabilized by sodium oleate and different alcohol cosurfactants, containing fatty acid esters or triglycerides as lipophilic components, have been investigated. Microemulsions containing triglycerides display a smaller stability region than microemulsions containing hydrocarbons or fatty acid esters. From structural investigations, using the NMR FT pulsed gradient spin echo method for measuring self-diffusion coefficients, differences in the microstructure are revealed as well. Adding an ester (or a hydrocarbon) to a microemulsion containing sodium oleate/pentanol will at certain compositions lead to a gradual transition from a bicontinuous to an oilcontinuous system, while this behavior cannot be detected when adding a triglyceride. Instead, a phase-separation occurs, and it is suggested that the larger molecular size of the triglyceride is responsible for the diffirence.

  • 175.
    Al-Ayish, Nadia
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    During, Otto
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Malaga, Katarina
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Silva, Nelson
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Gudmundsson, Kjartan
    KTH Royal Institute of Technology, Sweden.
    The influence of supplementary cementitious materials on climate impact of concrete bridges exposed to chlorides2018Inngår i: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 188, s. 391-398Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In order to reach a specific service life of reinforced concrete structures a certain cover thickness is needed. At present, this is regulated by national standards that also limit the amount and type of supplementary cementitious materials in different exposure environments. The regulations do not, however, consider the actual durability performance of concrete with supplementary cementitious materials. As a consequence, the LCA results might be misleading. This paper shows the environmental impact of concrete with supplementary cementitious materials in chloride environment considering their specific performances. Prescriptive and performance based service life prediction models for chloride ingress are applied and compared.

  • 176.
    Al-Ayish, Nadia
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Malaga, Katarina
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Hadi, Mohammad
    University of Wollongong, Australia.
    Neaz Sheikh, M.
    University of Wollongong, Australia.
    Gudmundsson, Kjartan
    KTH Royal Institute of Technology, Sweden.
    Karoumi, Raid
    KTH Royal Institute of Technology, Sweden.
    Environmental impact of concrete structures reinforced with GFRP bars: A simplified study on columns2019Inngår i: Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, International Federation for Structural Concrete , 2019, s. 1998-2005Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Concrete has a significant influence on the global warming due to its high usage in the construction industry. There are a few different strategies to increase the sustainability potential of concrete structures. Most of these strategies involve reduction of the total clinker content. One strategy, which is often neglected due to its complexity, is to increase the durability of the concrete structure. By increasing the durability, the need for repair and maintenance is reduced and thus less resources are consumed during the service life. One of the main deterioration mechanisms in concrete structures is the corrosion of steel reinforcement. A strategy to increase the service life of concrete structures in harsh environment would therefore be to increase the durability of concrete or to use low- or non-corrosive reinforcement instead of traditional steel reinforcement. This paper focuses on the latter. Glass fibre reinforced polymer (GFRP) bars are non-corrosive and have emerged as an alternative to steel bars in reinforced concrete structures in harsh environment. They have other mechanical properties than steel and opens for alternative mix designs for concrete. However, the environmental impact of concrete structures reinforced with GFRP bars has not been fully investigated and most life-cycle assessment (LCA) studies have an exchange ratio of 1:1 between GFRP and steel bars despite differences in the mechanical properties. This paper studies the climate impact of concrete columns reinforced with GFRP bars through an LCA methodology, focusing on the functional unit.

  • 177.
    Alberius, Peter
    et al.
    YKI – Ytkemiska institutet.
    Andersson, N
    Spray drying functionalized mesostructured colloids2003Inngår i: Self-Assembled Nanostructured Materials / [ed] Yunfeng Lu, C J Brinker , M Antonietti, Materials Research Society, 2003, s. 53-58Kapittel i bok, del av antologi (Fagfellevurdert)
  • 178. Albers, Eva
    et al.
    Johansson, Emma
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Processum.
    Franzén, Carl Johan
    Larsson, Christer
    Selective suppression of bacterial contaminants by process conditions during lignocellulose based yeast fermentations2011Inngår i: Biotechnology for Biofuels, ISSN 1754-6834, E-ISSN 1754-6834, Vol. 4, artikkel-id Art no 59Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: Contamination of bacteria in large-scale yeast fermentations is a serious problem and a threat to the development of successful biofuel production plants. Huge research efforts have been spent in order to solve this problem, but additional ways must still be found to keep bacterial contaminants from thriving in these environments. The aim of this project was to develop process conditions that would inhibit bacterial growth while giving yeast a competitive advantage. Results: Lactic acid bacteria are usually considered to be the most common contaminants in industrial yeast fermentations. Our observations support this view but also suggest that acetic acid bacteria, although not so numerous, could be a much more problematic obstacle to overcome. Acetic acid bacteria showed a capacity to drastically reduce the viability of yeast. In addition, they consumed the previously formed ethanol. Lactic acid bacteria did not show this detrimental effect on yeast viability. It was possible to combat both types of bacteria by a combined addition of NaCl and ethanol to the wood hydrolysate medium used. As a result of NaCl + ethanol additions the amount of viable bacteria decreased and yeast viability was enhanced concomitantly with an increase in ethanol concentration. The successful result obtained via addition of NaCl and ethanol was also confirmed in a real industrial ethanol production plant with its natural inherent yeast/bacterial community. Conclusions: It is possible to reduce the number of bacteria and offer a selective advantage to yeast by a combined addition of NaCl and ethanol when cultivated in lignocellulosic medium such as wood hydrolysate. However, for optimal results, the concentrations of NaCl + ethanol must be adjusted to suit the challenges offered by each hydrolysate. © 2011 Albers et al; licensee BioMed Central Ltd.

  • 179. Albert, J
    et al.
    Fokine, M
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Grating formation in pure silica-core fibers2002Inngår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 27, nr 10, s. 809-811Artikkel i tidsskrift (Fagfellevurdert)
  • 180.
    Albertsson, Joakim
    et al.
    mobhome.
    Andersson, Sven
    mobhome.
    Metodstudier vid mobiltelefonanvändning2011Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [sv]

    Mobiltelefoner är något som nästan alla har tillgång till idag. Samtidigt ökar hela tiden användningsområdena på just mobiltelefoner. Nya modeller kommer ständigt och i takt med detta ökar även funktionaliteten av dem. Det är idag möjligt att utföra en rad andra saker än att endast ringa och skicka SMS med hjälp av sin mobiltelefon. Olika personer använder sina telefoner på olika sätt, olika mycket och till olika saker och detta har studerats på en mängd olika sätt. Att mobiltelefoner är just mobila innebär att de följer människor när de förflyttar sig och därför har även mobiltelefonanvändning på olika platser studerats. Olika metoder lämpar sig olika bra beroende på var användningen skall studeras. Den här uppsatsen syftar till att försöka få fram vilka metoder som lämpar sig för att studera mobiltelefonanvändning med hemmet som användningsmiljö. Med hjälp av litteraturstudier kom vi fram till vilka metoder som var relevanta att testa i hemmiljö och därefter har vi utfört dessa. Vi kom fram till att det inte fanns någon specifik metod som var bättre än någon annan men att resultatet blev mycket bättre om man kombinerade olika typer av metoder.

    Fulltekst (pdf)
    fulltext
  • 181.
    Albertsson, Lars
    RISE - Research Institutes of Sweden, ICT, SICS.
    An Overview of Practical Research Approaches to Real-Time System Engineering2001Rapport (Annet vitenskapelig)
    Abstract [en]

    This is a state of the art report and literature overview of practical methods for constructing and analysing real-time systems. It covers operating system support, monitoring methods, and execution time prediction through simulation.

    Fulltekst (pdf)
    FULLTEXT01
  • 182.
    Albertsson, Lars
    RISE - Research Institutes of Sweden, ICT, SICS.
    Entropy Injection2007Rapport (Annet vitenskapelig)
    Abstract [en]

    Testing is the predominant software quality assurance method today, but it has a major flaw --- it cannot reliably catch race conditions, intermittent errors caused by factors that cannot be controlled during testing, such as unpredictable timing behaviour in concurrent software. We present entropy injection, a extension of traditional test methods, which enable developers to create tests for arbitrary types of race conditions in any software application, reusing the application's existing test cases. An entropy injector runs the software under test in an instruction set simulator, where all factors that normally are unpredictable can be explicitly controlled. The injector provokes race condition defects by artificially changing the timing behaviour of the simulated processors, hardware devices, clocks, and input models. Provoked defects can be debugged by developers in a non-intrusive, programmable debugger, which allows race condition defects to be reproduced and provides access to all software state in a distributed system. Developers can use its services to create application-specific injection strategies and directed regression test cases that monitor application state and test specific interleavings of events. Our proof-of-concept entropy injector implementation Njord is built on Nornir, a debugger environment based on the complete system simulator Simics. Njord provokes test case failures by suspending simulated processors, thereby injecting delays in the processes in a concurrent application. We demonstrate Njord on a small test routine, and show how a developer can write a race condition regression test that triggers errors with very high probability, or provoke errors with good probability without using application knowledge.

    Fulltekst (pdf)
    FULLTEXT01
  • 183.
    Albertsson, Lars
    RISE - Research Institutes of Sweden, ICT, SICS.
    Holistic debugging2006Rapport (Annet vitenskapelig)
    Abstract [en]

    We present holistic debugging, a novel method for observing execution of complex and distributed software. It builds on an instruction set simulator, which provides reproducible experiments and non-intrusive probing of state in a distributed system. Instruction set simulators, however, provide low-level information, so a holistic debugger contains a translation framework that maps this information to higher abstraction level observation tools, such as source code debuggers. We have created Nornir, a proof-of-concept holistic debugger, built on the simulator Simics. For each observed process in the simulated system, Nornir creates an abstraction translation stack, with virtual machine translators that map machine-level storage contents (e.g. physical memory, registers) provided by Simics, to application-level data (e.g. virtual memory contents) by parsing the data structures of operating systems and virtual machines. Nornir includes a modified version of the GNU debugger (GDB), which supports non-intrusive symbolic debugging of distributed applications. Nornir's main interface is a debugger shepherd, a programmable interface that controls multiple debuggers, and allows users to coherently inspect the entire state of heterogeneous, distributed applications. It provides a robust observation platform for construction of new observation tools.

    Fulltekst (pdf)
    FULLTEXT01
  • 184.
    Albertsson, Lars
    RISE, Swedish ICT, SICS. CNA.
    Holistic debugging - enabling instruction set simulation for software quality assurance2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present holistic debugging, a novel method for observing execution of complex and distributed software. It builds on an instruction set simulator, which provides reproducible experiments and non-intrusive probing of state in a distributed system. Instruction set simulators, however, only provide low-level information, so a holistic debugger contains a translation framework that maps this information to higher abstraction level observation tools, such as source code debuggers. We have created Nornir, a proof-of-concept holistic debugger, built on the simulator Simics. For each observed process in the simulated system, Nornir creates an abstraction translation stack, with virtual machine translators that map machine-level storage contents (e.g. physical memory, registers) provided by Simics, to application-level data (e.g. virtual memory contents) by parsing the data structures of operating systems and virtual machines. Nornir includes a modified version of the GNU debugger (GDB), which supports non-intrusive symbolic debugging of distributed applications. Nornir's main interface is a debugger shepherd, a programmable interface that controls multiple debuggers, and allows users to coherently inspect the entire state of heterogeneous, distributed applications. It provides a robust observation platform for construction of new observation tools.

    Fulltekst (pdf)
    FULLTEXT01
  • 185.
    Albertsson, Lars
    RISE - Research Institutes of Sweden, IKT, SICS.
    Simulation-based debugging of soft real-time applications2001Inngår i: Real-Time Technology and Applications Symposium, 2001. Proceedings. Seventh IEEE, 2001, 1, s. 107-109Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present a temporal debugger, capable of examining time flow of soft real-time applications in Unix systems. The debugger is based on a simulator modelling an entire workstation in sufficient detail to run unmodified operating systems and applications. It provides a deterministic and non-intrusive debugging environment, allowing reproducible presentation of program time flow. The primary contribution of this paper is virtual machine translation, a technique necessary to debug applications in a simulated Unix system. We show how a virtual machine translator maps low-level data, provided by the simulator, to data useful to a symbolic debugger. The translator operates by parsing data structures in the target operating system and has been implemented for the GNU debugger and simulated Linux systems.

  • 186.
    Albertsson, Lars
    RISE., Swedish ICT, SICS.
    Temporal debugging and profiling of multimedia applications2002Inngår i: Proceedings of Multimedia Computing and Networking 2002, 2002, 1Konferansepaper (Fagfellevurdert)
  • 187.
    Albertsson, Lars
    et al.
    RISE - Research Institutes of Sweden, IKT, SICS.
    Magnusson, Peter
    RISE - Research Institutes of Sweden, IKT, SICS.
    Simulation-based temporal debugging of Linux2000Inngår i: Proceedings of the Second Real-Time Linux Workshop, 27-28 Nov 2000, Orlando, Florida, USA, 2000, 1Konferansepaper (Fagfellevurdert)
  • 188.
    Albertsson, Lars
    et al.
    RISE - Research Institutes of Sweden, IKT, SICS.
    Magnusson, Peter
    RISE - Research Institutes of Sweden, IKT, SICS.
    Using complete system simulation for temporal debugging of general purpose operating systems and workloads2000Inngår i: Proceedings of MASCOTS 2000, 29 Aug - 01 Sept 2000, San Francisco, California, USA, IEEE, 2000, 1Konferansepaper (Fagfellevurdert)
  • 189.
    Albornoz-Palma, Gregory
    et al.
    Universidad de Concepción, Chile.
    Betancourt, Fernando
    Universidad de Concepción, Chile.
    Mendonça, Regis
    Universidad de Concepción, Chile.
    Chinga-Carrasco, Gary
    RISE - Research Institutes of Sweden, Bioekonomi, PFI.
    Pereira, Miguel
    RISE - Research Institutes of Sweden, Bioekonomi, PFI. Universidad de Concepción, Chile.
    Relationship between rheological and morphological characteristics of cellulose nanofibrils in dilute dispersions2019Inngår i: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, artikkel-id 115588Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The morphology of cellulose nanofibrils (CNFs), the rheological characteristics of their dispersions, and the corresponding relationships, are fundamental for understanding the properties of the material. This work aims at understanding how the morphological characteristics of the CNFs affect the rheology of the dispersions in the dilute region and to establish a relationship between both properties. A strong relationship was observed between the intrinsic viscosity of the CNF dispersions and their aspect ratio, which can be correlated through the expression ρ[η]=0.051p1.85. When comparing the model obtained in this work to the wormlike chain model, it was possible to verify that these models are independent of the flexibility of the CNFs. Regarding the fibrillation process, the dynamic viscosity only reflects part of the behavior of the morphological properties of the CNFs and does not provide reliable data that would allow these characteristics to be inferred, while the intrinsic viscosity does allow this relationship. 

  • 190.
    Albrektsson, Joakim
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Nytt belastiningssystem installerat på SP Brandteknik2013Inngår i: Brandposten, nr 49, s. 42-Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 191.
    Albrektsson, Joakim
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Jansson, Robert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Assessment of concrete structures after fire2011Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    FULLTEXT01
  • 192.
    Albrektsson, Joakim
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh). SP Sveriges tekniska forskningsinstitut.
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm). SP Sveriges tekniska forskningsinstitut.
    Jansson, Robert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd. SP Sveriges tekniska forskningsinstitut.
    Assessment of fire exposed concrete with full-field strain determination2011Inngår i: Proceedings pro080 : 2nd International Workshop on Concrete Spalling due to Fire Exposure., RILEM , 2011, , s. 337-344Konferansepaper (Fagfellevurdert)
  • 193.
    Albrektsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Jansson, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Capillary suction and chloride migration in fire exposed concrete with PP-fibre2012Inngår i: 3rd International Conference on Concrete Repair, Rehabilitation and Retrofitting III. ICCRRR 2012, 2012, , s. 128-130Konferansepaper (Fagfellevurdert)
  • 194.
    Albrektsson, Joakim
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Jansson, Robert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Flansbjer, Mathias
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lindqvist, Jan-Erik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, material (BRm).
    Quantification of fire damage of concrete for tunnel applications2012Inngår i: Proceedings from the Fifth International Symposium on Tunnel Safety and Security, SP , 2012, , s. 685-694Konferansepaper (Annet vitenskapelig)
  • 195.
    Albrektsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Jansson, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Silfwerbrand, Johan
    Assessment of fire exposed concrete structures2012Inngår i: fib Symposium 2012: Concrete Structures for Sustainable Community, 2012, , s. 619-626Konferansepaper (Fagfellevurdert)
  • 196.
    Albrektsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Lind, Per
    Brandprov av limträbalkar för Japan2011Inngår i: Brandposten, nr 45, s. 7-Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 197.
    Albrektsson, Joakim
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Mattsson, Ida
    Skadeutredning av parkeringsgarage efter storbrand2011Inngår i: Brandposten, nr 45, s. 10-Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 198.
    Alcusa-Saez, E. P.
    et al.
    University of Valencia, Spain.
    Diez, A.
    University of Valencia, Spain.
    Rivera-Perez, E.
    University of Valencia, Spain.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Norin, Lars
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Andres, M. V.
    University of Valencia, Spain.
    All-fiber acousto-optic tunable filter in polyimide coated optical fibers2017Inngår i: International Conference on Transparent Optical Networks, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We present the experimental demonstration of in-fiber acousto-optic coupling in a polyimide-coated optical fiber. Although the presence of the polyimide coating increases is significantly the attenuation of the acoustic wave, we show that acousto-optic interaction can still be produced with reasonable efficiency. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. To our knowledge, this is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.

  • 199.
    Alcusa-Sáez, E. P.
    et al.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Díez, Antonio
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Rivera-Pérez, E.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Margulis, Walter
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Norin, L.
    RISE - Research Institutes of Sweden, ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Andrés, M. V.
    ICMUV Departamento de Física Aplicada y Electromagnetismo, Spain.
    Acousto-optic interaction in polyimide coated optical fibers with flexural waves2017Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, nr 15, s. 17167-17173Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Acousto-optic coupling in polyimide-coated single-mode optical fibers using flexural elastic waves is demonstrated. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. Although the elastic attenuation is significant, we show that acousto-optic coupling can be produced with a reasonably good efficiency. To our knowledge, it is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.

  • 200.
    Aleite, Edgardo
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Gyllström, Joakim
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Mätning av intensitetsbrus i lasrar (RIN)2000Rapport (Fagfellevurdert)
    Fulltekst (pdf)
    FULLTEXT01
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