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  • 51. Adhikari, A
    et al.
    Claesson, P
    YKI – Ytkemiska institutet.
    Pan, J
    Leygraf, C
    Dedinaite, A
    YKI – Ytkemiska institutet.
    Blomberg, E
    YKI – Ytkemiska institutet.
    Electrochemical behavior and anticorrosion properties of modified polyaniline dispersed in polyvinylacetate coating on carbon steel2008Ingår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 53, s. 4239-4247Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Conducting polyaniline (Pani) was prepared in the presence of methane sulfonic acid (MeSA) as dopant by chemical oxidative polymerization. The Pani–MeSA polymer was characterized by FT-IR, UV–vis, X-ray diffraction (XRD) and impedance spectroscopy. The polymer was dispersed in polyvinylacetate and coated on carbon steel samples by a dipping method. The electrochemical behavior and anticorrosion properties of the coating on carbon steel in 3% NaCl were investigated using open-circuit potential (OCP) versus time of exposure, and electrochemical techniques including electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and cyclic voltammetry (CV). During initial exposure, the OCP dropped about 0.35 V and the interfacial resistance increased several times, indicating a certain reduction of the polymer and oxidation of the steel surface. Later the OCP shifted to the noble direction and remained at a stable value during the exposure up to 60 days. The EIS monitoring also revealed the initial change and later stabilization of the coating. The stable high OCP and low coating impedance suggest that the conducting polymer maintains its oxidative state and provides corrosion protection for carbon steel throughout the investigated period. The polarization curves and CV show that the conducting polymer coating induces a passive-like behavior and greatly reduces the corrosion of carbon steel.

  • 52.
    Adhikari, Arindam
    et al.
    YKI – Ytkemiska institutet.
    Radhakrishnan, S
    Dopant induced effect on electrocatalytic reduction of nitrobenzene using conducting polypyrrole thin film electrodes2011Ingår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 120, nr 2, s. 719-724Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Conducting polypyrrole electrodes were prepared by electrochemical polymerization of pyrrole on vacuum-metallized glass substrates. These electrodes were modified by doping with a range of metal halides as dopant ions having different electronegativity. Electrochemical reduction of nitrobenzene using these electrodes was studied by means of cyclic voltammetry technique in acetonitrile medium containing aqueous HClO4 (0.1M) as supporting electrolyte. It was found that the electronegativity of the dopant ion played a very important role in the electrocatalytic activity. Polypyrrole doped with nickel chloride gave the highest anodic current at the reduction potential of nitrobenzene. The results were explained on the basis of charge transfer efficiency at the electrode-electrolyte interface, which was associated with the acceptor state created by the dopant in the semi-conducting polymer.

  • 53.
    Adler, Daniel
    RISE - Research Institutes of Sweden, ICT, SICS.
    Virtual Audio - Three-Dimensional Audio in Virtual Environments1996Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Three-dimensional interactive audio has a variety ofpotential uses in human-machine interfaces. After lagging seriously behind the visual components, the importance of sound is now becoming increas-ingly accepted. This paper mainly discusses background and techniques to implement three-dimensional audio in computer interfaces. A case study of a system for three-dimensional audio, implemented by the author, is described in great detail. The audio system was moreover integrated with a virtual reality system and conclusions on user tests and use of the audio system is presented along with proposals for future work at the end of the paper. The thesis begins with a definition of three-dimensional audio and a survey on the human auditory system to give the reader the needed knowledge of what three-dimensional audio is and how human auditory perception works.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 54.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    A conversion of the measured anisotropic thermal properties by transient plane heat source to the isotropic thermal properties2009Konferensbidrag (Övrigt vetenskapligt)
  • 55.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Anisotropa termiska egenskaper kan bestämmas med TPS-metoden2006Ingår i: BrandPosten, nr 35, s. 36-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 56.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Bestämning av termiska egenskaper hos betong vid höga temperaturer2005Ingår i: Betong, nr 3, s. 51-53Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 57.
    Adl-Zarrabi, Bijan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Bestämning av termiska egenskaper vid höga temperaturer2005Ingår i: Bygg & Teknik, nr 6, s. 51-54Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Ladda ner fulltext (pdf)
    fulltext
  • 58.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Branddörrar i vägtunnlar2007Rapport (Refereegranskat)
    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 59.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Influence of environmental parameters on the thermal behaviour of the intumescent fire seals2009Ingår i: Proceedings of Fire and Materials 2009, Interscience Communications Ltd , 2009, , s. 427-436Konferensbidrag (Refereegranskat)
  • 60.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Influences of environmental parameters on the behaviour of fire seals2008Ingår i: BrandPosten, nr 38, s. 26-27Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 61.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Inverkan av fuktkvot och värme på funktionen hos brandsvällande lister2007Rapport (Refereegranskat)
    Ladda ner fulltext (pdf)
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  • 62.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Measuring anisotropic thermal properties of metagranite at different scales2009Konferensbidrag (Övrigt vetenskapligt)
  • 63.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    New apparatus for determining thermal explansion at high temperatures2006Ingår i: BrandPosten, nr 34, s. 33-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 64.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Nytt lab för mätning av termiska egenskaper vid höga temperaturer2003Ingår i: BrandPosten, nr 29, s. 40-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 65.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Nytt TPS-laboratorium för mätning av termiska egenskaper vid höga temperaturer2003Ingår i: BrandPosten, nr 28, s. 38-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 66.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Simultaneous Determination of Thermal Conductivity and Thermal Diffusivity by the Transient Plane Source Method - An important input to the understanding of rock material properties2005Ingår i: Construction Technology in Europe, nr 28, s. 1-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 67.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    SP bildar temperaturcentrum2005Ingår i: BrandPosten, nr 32, s. 15-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 68.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Termiska egenskaper med 'Transient Plane Source' metoden2004Ingår i: BrandPosten, nr 31, s. 7-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 69.
    Adl-Zarrabi, Bijan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    The TPS method for determining of insulation of pipes2005Ingår i: EuroHeat & Power, nr 11, s. 40-42Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 70.
    Adl-Zarrabi, Bijan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Boström, Lars
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Wickström, Ulf
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Using the TPS method for determining the thermal properties of concrete and wood at elevated temperature2006Ingår i: Fire and Material, Vol. 30, nr 5, s. 359-369Artikel i tidskrift (Refereegranskat)
  • 71.
    Adl-Zarrabi, Bijan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Hjohlman, Maria
    Brandteknik, forskning (BRf ).
    Mätning av värmekonduktivitet hos tunna skikt2008Ingår i: BrandPosten, nr 38, s. 32-33Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 72.
    Adolfson, Gert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek..
    En teknisk och säkerhetsmässig utvärdering av två aggregat för maskinell röjning1991Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    En jämförelse av slag- och klingaggregat vid maskinell röjning visar att klingaggregatet är säkrast mot olycksfall, vilket är speciellt viktigt om maskinell och motormanuell röjning sker samtidigt. Klingaggregatet har lika hög prestanda och ger ett godtagbart resultat ur ekologisk synpunkt.

    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 73.
    Adolfson, Gert
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Projekt Förädling - framtagning av affärsstrategi, förädlingskoncept och handlingsplan för utveckling av ett nischsågverk med en förstärkt konkurrensförmåga2001Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    Denna slutrapport utgör en sammanfattning och dokumentation av Projekt Förädling. Projektet har genomförts av ledningsgruppen för företagen AB CF Berg & Co samt OLAB Timber med stöd av Trätek. Resultatet av Projekt Förädling visar att de undersökta kunderna ställer definierade och preciserade kvalitetskrav både på produktens kärnegenskaper, men även på de lösningar och tjänster som är kopplade till produkten, affären och/eller leveransen. Det kan gälla gemensam produktutveckling eller andra lösningar som effektiviserar och utvecklar ett närmare samarbete mellan kund och leverantör.

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  • 74.
    Adolfson, Gert
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Markgren, Fredrik
    Samverkan och affärsutveckling i träkedjan - sågverk och nätverk i förändring2000Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    Denna rapport beskriver ett delresultat från projektet "Samverkan och affärsutveckling i träkedjan" (SAIT). Rapporten redovisar genomförande och resultat från genomförd verksamhetsdefinition och -diagnos på ett sågverk och några av deras kunder och leverantörer i ett nätverk. Rapporten redovisar också hur denna typ av arbete kan användas som underlag vid verksamhetsutveckling samt hur resultatet kan användas för att spegla sågverkets situation i ett antal utvalda och väl kända teoribildningar (nätverk, imaginära organisationer, koordination, informationssystem, processer, planering och affärslogik). Syftet med denna spegling är att undersöka teoriernas tillämpbarhet i detta sammanhang samt att bättre förstå sågverkets position i nätverket samt dess pågående förändringsprocess. I rapporten diskuteras också den forskningsansats vi tillämpat, kunskaps- och förändringsbehov i studerad träkedja samt några områden för framtida forskning.

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  • 75.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    300/30 - a class that does not exist, but which is nevertheless used2002Ingår i: BrandPosten, nr 27, s. 25-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 76.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    300/30 - en klass som inte finns men som används ändå2002Ingår i: BrandPosten, nr 27, s. 24-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 77.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Assa brandprovar för CE-märkning2003Ingår i: BrandPosten, nr 29, s. 11-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 78.
    Adolfsson, Per
    Sitac (CEc).
    Boverkets nya byggregler BBR 19 träder i kraft från den 1 januari 20122011Ingår i: Brandposten, nr 45, s. 16-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 79.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Brandavskiljande byggnadsdelar är inte alltid röktäta2002Ingår i: BrandPosten, nr 27, s. 23-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 80.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Branddörrar kan provas för kommande CE-märkning2002Ingår i: BrandPosten, nr 27, s. 24-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 81.
    Adolfsson, Per
    Sitac (CEc).
    CE-märkta brandavskiljande innerväggar2003Ingår i: BrandPosten, nr 28, s. 44-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 82.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    CEN ser över standarden för brandprovning av förvaringsskåp2003Ingår i: BrandPosten, nr 28, s. 24-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 83.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Fire doors can be tested for future CE-marketing2002Ingår i: BrandPosten, nr 27, s. 24-25Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 84.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Fire-separating parts of buildings are not always smoke-tight2002Ingår i: BrandPosten, nr 27, s. 23-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 85.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Sapa först med klassifikationsrapport enligt ny standard2003Ingår i: BrandPosten, nr 29, s. 44-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 86.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    SP erbjuder certifiering av marin utrustning2000Ingår i: BrandPosten, nr 22, s. 7-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 87.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    SP är anmält organ för EU-direktivet om marin utrustning2001Ingår i: BrandPosten, nr 24, s. 4-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 88.
    Adolfsson, Per
    et al.
    Sitac (CEc).
    Gustavsson, Börje
    Byggnadsfysik och innemiljö (ETi ).
    Häggström, Urban
    SP- Sveriges Tekniska Forskningsinstitut, Trätek.
    CE-märkning av fönster2008Rapport (Refereegranskat)
    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 89.
    Adolfsson, Per
    et al.
    Sitac (CEc).
    Gustavsson, Börje
    Byggnadsfysik och innemiljö (ETi ).
    Häggström, Urban
    SP- Sveriges Tekniska Forskningsinstitut, Trätek.
    CE-märkning av ytterdörrar2008Rapport (Refereegranskat)
    Ladda ner fulltext (pdf)
    FULLTEXT01
  • 90.
    Adolfsson, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Certifieringsregler för P-märkning av expanderande torrbruk. SPCR 0401994Rapport (Övrigt vetenskapligt)
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    fulltext
  • 91.
    Afanasov, M.
    et al.
    Politecnico di Milano, Italy; Credit Suisse, Poland.
    Djordjevic, A.
    Politecnico di Milano, Italy.
    Lui, F.
    Politecnico di Milano, Italy.
    Mottola, Luca
    RISE - Research Institutes of Sweden (2017-2019), ICT, SICS. Politecnico di Milano, Italy.
    Flyzone: A testbed for experimenting with aerial drone applications2019Ingår i: MobiSys 2019 - Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and Services, Association for Computing Machinery, Inc , 2019, s. 67-78Konferensbidrag (Refereegranskat)
    Abstract [en]

    FlyZone is a testbed architecture to experiment with aerial drone applications. Unlike most existing drone testbeds that focus on low-level mechanical control, FlyZone offers a high-level API and features geared towards experimenting with application-level functionality. These include the emulation of environment influences, such as wind, and the automatic monitoring of developer-provided safety constraints, for example, to mimic obstacles. We conceive novel solutions to achieve this functionality, including a hardware/software architecture that maximizes decoupling from the main application and a custom visual localization technique expressly designed for testbed operation. We deploy two instances of FlyZone and study performance and effectiveness. We demonstrate that we realistically emulate the environment influence with a positioning error bound by the size of the smallest drone we test, that our localization technique provides a root mean square error of 9.2cm, and that detection of violations to safety constraints happens with a 50ms worst-case latency. We also report on how FlyZone supported developing three real-world drone applications, and discuss a user study demonstrating the benefits of FlyZone compared to drone simulators. 

  • 92.
    Afanasov, Mikhail
    et al.
    Politecnico di Milano, Italy.
    Iavorskii, Aleksandr
    John Wiley & Sons Inc, Russia.
    Mottola, Luca
    RISE - Research Institutes of Sweden, ICT, SICS. Politecnico di Milano, Italy.
    Programming Support for Time-sensitive Adaptation in Cyberphysical Systems2018Ingår i: ACM SIGBED Review, Vol. 14, nr 4, s. 27-32Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Cyberphysical systems (CPS) integrate embedded sensors,actuators, and computing elements for controlling physicalprocesses. Due to the intimate interactions with thesurrounding environment, CPS software must continuouslyadapt to changing conditions. Enacting adaptation decisionsis often subject to strict time requirements to ensure controlstability, while CPS software must operate within the tightresource constraints that characterize CPS platforms. Developersare typically left without dedicated programmingsupport to cope with these aspects. This results in either toneglect functional or timing issues that may potentially ariseor to invest significant efforts to implement hand-crafted solutions.We provide programming constructs that allow developersto simplify the specification of adaptive processingand to rely on well-defined time semantics. Our evaluationshows that using these constructs simplifies implementationswhile reducing developers’ effort, at the price of a modestmemory and processing overhead.

  • 93.
    Afanasov, Mikhail
    et al.
    Politecnico di Milano, Italy.
    Mottola, Luca
    RISE - Research Institutes of Sweden, ICT, SICS. Politecnico di Milano, Italy.
    Ghezzi, Carlo
    Politecnico di Milano, Italy.
    Software Adaptation in Wireless Sensor Networks2018Ingår i: ACM Transactions on Autonomous and Adaptive Systems, Vol. 12, nr 4, s. 1-29Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present design concepts, programming constructs, and automatic verification techniques to support thedevelopment of adaptive Wireless Sensor Network (WSN) software. WSNs operate at the interface betweenthe physical world and the computing machine, and are hence exposed to unpredictable environment dynamics.WSN software must adapt to these dynamics to maintain dependable and efficient operation. Whilesignificant literature exists on the necessary adaptation logic, developers are left without proper support inmaterializing such a logic in a running system. Our work fills this gap with three key contributions: i) designconcepts help developers organize the necessary adaptive functionality and understand their relations,ii) dedicated programming constructs simplify the implementations, iii) custom verification techniques allowdevelopers to check the correctness of their design before deployment. We implement dedicated toolsupport to tie the three contributions, facilitating their practical application. Our evaluation considers representativeWSN applications to analyze code metrics, synthetic simulations, and cycle-accurate emulationof popular WSN platforms. The results indicate that our work is effective in simplifying the developmentof adaptive WSN software; for example, implementations are provably easier to test and to maintain, therun-time overhead of our dedicated programming construct is negligible, and our verification techniquesreturn results in a matter of seconds.

  • 94.
    Afrasiabi, R.
    et al.
    KTH Royal Institute of Technology, Sweden.
    Jokilaakso, N.
    KTH Royal Institute of Technology, Sweden.
    Schmidt, T.
    KTH Royal Institute of Technology, Sweden.
    Björk, Per
    RISE., Swedish ICT, Acreo.
    Karlström, A. E.
    KTH Royal Institute of Technology, Sweden.
    Linnros, J.
    KTH Royal Institute of Technology, Sweden.
    Effect of microwave-assisted silanization on sensing properties of silicon nanoribbon FETs2015Ingår i: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 209, s. 586-595Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An important concern with using silicon nanoribbon field-effect transistors (SiNR FET) for ion-sensing is the pH-response of the gate oxide surface. Depending on the application of the FET sensor, this response has to be chemically manipulated. Thus in silicon oxide-gated pH-sensors with integrated sensor and reference FETS, a surface with high pH-sensitivity, compared to the bare gate oxide, is required in the sensor FETs (SEFET), whereas in the reference FETs (REFET) the surface has to be relatively pH-insensitive. In order to control the sensitivity and chemistry of the oxide surface of the nanoribbons, a silanization reagent with a functional group is often self-assembled on the SiNR surface. Choice of a silanization reaction that results in a self-assembled layer on a silicon oxide surface has been studied extensively over the past decades. However, the effect of various self-assembled layers such as monolayers or mixed layers on the electrical response of SiNR FETs in aqueous solution needs to be exploited further, especially for future integrated SEFET/REFET systems. In this work, we have performed a comprehensive study on 3-aminopropyltriethoxysilane (APTES) silanization of silicon oxide surfaces using microwave (MW) heating as a new biocompatible route to conventional methods. A set of complementary surface characterization techniques (ellipsometry, AFM and ATR-FTIR) was used to analyze the properties of the APTES layer deposited on the silicon surface. We have found that a uniform monolayer can be achieved within 10 min by heating the silanization solution to 75 °C using MW heating. Furthermore, electrical measurements suggest that little change in device performance is observed after exposure to MW irradiation. Real-time pH measurements indicate that a uniform APTES monolayer not only reduces the pH sensitivity of SiNR FET by passivating the surface silanol groups, but also makes the device less sensitive to cation concentration in the background electrolyte. Our silanization route proves promising for future chemical surface modification of on-chip REFETs.

  • 95.
    Afrasiabi, Roodabeh
    et al.
    KTH Royal Institute of Technology, Sweden.
    Soderberg, Lovisa M.
    KTH Royal Institute of Technology, Sweden.
    Joensson, Haakan N.
    KTH Royal Institute of Technology, Sweden.
    Björk, Per
    RISE., Swedish ICT, Acreo.
    Svahn, Helene A.
    KTH Royal Institute of Technology, Sweden.
    Linnros, Jan
    KTH Royal Institute of Technology, Sweden.
    Integration of a droplet-based microfluidic system and silicon nanoribbon FET sensor2016Ingår i: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 7, nr 8, artikel-id 134Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present a novel microfluidic system that integrates droplet microfluidics with a silicon nanoribbon field-effect transistor (SiNR FET), and utilize this integrated system to sense differences in pH. The device allows for selective droplet transfer to a continuous water phase, actuated by dielectrophoresis, and subsequent detection of the pH level in the retrieved droplets by SiNR FETs on an electrical sensor chip. The integrated microfluidic system demonstrates a label-free detection method for droplet microfluidics, presenting an alternative to optical fluorescence detection. In this work, we were able to differentiate between droplet trains of one pH-unit difference. The pH-based detection method in our integrated system has the potential to be utilized in the detection of biochemical reactions that induce a pH-shift in the droplets.

  • 96. Africano, Diana
    et al.
    Clark, Brendon
    RISE, Swedish ICT, Interactive Institute. Design Research Unit.
    Design för kulturell mångfald2006Ingår i: Västerbotten (Umeå. 1920), Västerbotten (Umeå. 1920) , 2006, 10, s. 36-39Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 97.
    Afshari, Alireza
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor. Chalmers tekniska högskola, Institutionen för installationsteknik.
    Determination of VOC emissions from surface coatings by environmental test chamber measurements1999Doktorsavhandling, monografi (Övrigt vetenskapligt)
  • 98.
    Agerkvist, I
    YKI – Ytkemiska institutet.
    Mechanisms of flocculation with chitosan in Escherichia coli distintegrates: effects of urea and chitosan characteristics1992Ingår i: Colloids and Surfaces, ISSN 0166-6622, E-ISSN 1873-4340, Vol. 69, s. 173-187Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Four different chitosans with different charge densities and different molecular weights were used for investigation of the mechanisms involved in selective flocculation of cell debris particles in E.coli disintegrates. It was found that the main mechanism for flocculation is a "non-equilibrium" bridging process in which a very efficient removal of cell debris particles can be achieved with highly charged chitosans. The high molecular weight (6.5-6.6x105) chitosans produce very large and shear resistant flocs suitable for filtration as well as settling and centrifugation. The low molecular weight (1x105) product forms smaller and more shear sensitive flocs best suited for centrifugation. There are small differences in flocculation dosages depending on molecular weight, but large differences are found with significant changes in charge densities. A decrease in the deacetylation degree from 93 to 39% increased the flocculation dosages by 100 to 150%. A low molecular weight chitosan gave a much broader flocculation region than that of a high molecular weight. Flocculation by addition of urea revealed a hydrogen bonding capacity of chitosan toward cell debris particles which was not involved in chitosan´s interaction with proteins or nucleic acids. The purification of the enzyme -galactosidase could be increased by a factor of 3.7 when using a two step flocculation procedure. The enzyme yield was 82% and the enzyme solution was essentially free of both nucleic acids and cell debris particles.

  • 99.
    Agerkvist, I
    et al.
    YKI – Ytkemiska institutet.
    Eriksson, LB
    YKI – Ytkemiska institutet.
    Selective flocculation with chitosan in E.Coli disintegrates: effects of ionic strength and multivalent metal ions1993Ingår i: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 14, s. 269-293Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The effects of ionic strength and multivalent metal ions on the flocculation performance in Escherichia coli cell disintegrates using the polycationic chitosan as a flocculant were investigated. The study showed that ionic strength could be used to optimize the selectivity in flocculation. The best selectivity was obtained at 0.5 M sodium chloride where 95% of the cell debris and 88% of the nucleic acids could be removed from the disintegrate by sedimentation, leaving 99% of proteins and 86% of -galactosidase enzyme activity in clarified solution. We will also discuss the mechanisms for interaction between chitosan and different groups of components in the disintegrate: cell debris particles, nucleic acid polymers and proteins.

  • 100. Aggoun, Abderrahmane
    et al.
    Beldiceanu, Nicolas
    Carlsson, Mats
    RISE., Swedish ICT, SICS.
    Fages, François
    Integrating rule-based modelling and constraint programming for solving industrial packing problems2010Ingår i: ERCIM News, ISSN 0926-4981, E-ISSN 1564-0094, s. 34-35Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Packing items in bins is an old but nevertheless challenging combinatorial problem with numerous applications in industry. We report on an original approach based on constraint programming and rule-based modelling, which has been investigated in the framework of the FP6 ‘specific targeted research project’ Net-WMS (Towards integrating virtual reality and optimization techniques in a new generation of Networked businesses in Warehouse Management Systems under constraints). It has applications in the automotive industry.

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