Change search
Refine search result
1234567 101 - 150 of 21375
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 101.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Shen, J.Z.
    Stockholm University.
    Defect Minimization in Prosthetic Ceramics2014In: Advanced Ceramics for Dentistry, Elsevier Inc. , 2014, p. 359-373Chapter in book (Refereed)
    Abstract [en]

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

  • 102.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Shen, Z.
    Stockholm University.
    Effects of granule density on strength and granule related defects in zirconia2012In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 32, no 11, p. 2653-2659Article in journal (Refereed)
    Abstract [en]

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

  • 103.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Tönnäng, Lenny
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    The effect of softmachining parameters on the mechanical strength of zirconia2015Conference paper (Other academic)
  • 104.
    Adolfsson, Erik
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Venturini, Francesca
    ZHAW School of Engineering, Switzerland.
    Schönherr, Veit
    ZHAW School of Engineering, Switzerland .
    Rey, Julien
    ZHAW School of Engineering, Switzerland .
    Characterization oflight-gas interaction in strongly-scattering nanoporous materials and itsimplications for tunable diode laser absorption spectroscopy2016In: Applied Physics B: Lasers and Optics, 2016, Vol. 123, p. 123-136Conference paper (Other academic)
    Abstract [en]

    Through the confinement of gas in nanoporous materials, it is possible to significantly increase the path length for light–gas interaction. This enables the observation of much stronger absorption features for the confined gas molecules. In this work, we systematically characterized a variety of disordered strongly scattering ZrO2 and Al2O3 nanoporous ceramic materials to exploit the potential of gas in scattering media absorption spectroscopy. As a result, we identified a material with an unprecedented performance in terms of optical path length enhancement. In ZrO2 with thicknesses above 6 mm, the path enhancement exceeds 1000. The results obtained with near-infrared absorption spectroscopy on oxygen were validated by time-of-flight measurements at 700 nm, thus demonstrating their robustness. Finally, we report quantitative oxygen concentration measurement using nanoporous materials as miniaturized random-scattering multipass cell with an extremely simple and low-cost setup.

  • 105.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Arbetsrutiner för färre olyckor vid service och reparationer på jordbrukstraktorer, SLO2012Report (Refereed)
  • 106.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Bra arbetsmiljö lönar sig!: tips för arbetsgivare inom jordbruket, SLA2005Report (Refereed)
  • 107.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Enkla åtgärder för att minska vibrationsnivåer i jordbrukstraktorer, SLO 9272009Report (Refereed)
  • 108.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Förbättrad arbetsmiljö i silo, SLO2012Report (Refereed)
  • 109.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Gödsla med toalettavfall: men certifiera först!2012Report (Refereed)
  • 110.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Helkroppsvibrationer: Behöver lantbrukaren bry sig? SLO-8972006Report (Refereed)
  • 111.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Kraftöverföringsaxeln: traktorredskapets farligaste del, SLO2013Report (Refereed)
  • 112.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Lägre helkroppsvibrationer med en vibrationsindikator i traktorn, SLO2011Report (Refereed)
  • 113.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Rätt arbetsmiljö i mjölkgropen - SLO 9072008Report (Refereed)
  • 114.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Säkra hjulbyten på jordbrukstraktorer: i fält och i verkstad, SLO2014Report (Refereed)
  • 115.
    Adolfsson, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Säkrare jordbruk med kamerasystem som visuellt hjälpmedel i traktorer: SLO 9462010Report (Refereed)
  • 116.
    Adolfsson, Niklas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Geng, Qiuqing
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Exponering för olycksfallsrisk och fysisk belastning vid rid- och travskolor2008Report (Refereed)
  • 117.
    Adolfsson, Niklas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Torén, Anna
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    JTI ger tekniktips till traktorförare2004Report (Refereed)
  • 118.
    Adolfsson, Niklas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Torén, Anna
    Öberg, Kurt
    Biomekanisk analys av belastning i höft och skuldra vid varierande sittställning i hjullastare2002Report (Refereed)
  • 119.
    Adolfsson, Niklas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Torén, Anna
    Öberg, Kurt
    Hälsoeffekter vid automatisk nivellering av stol vid traktorkörning2004Report (Refereed)
  • 120.
    Adolfsson, Niklas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Öberg, Kurt
    Torén, Anna
    Förebyggande av belastningsskador vid arbete med armstödsburna reglage i mobila arbetsmaskiner2004Report (Refereed)
  • 121.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    300/30 - a class that does not exist, but which is nevertheless used2002In: BrandPosten, no 27, p. 25-Article in journal (Other (popular science, discussion, etc.))
  • 122.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    300/30 - en klass som inte finns men som används ändå2002In: BrandPosten, no 27, p. 24-Article in journal (Other (popular science, discussion, etc.))
  • 123.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Assa brandprovar för CE-märkning2003In: BrandPosten, no 29, p. 11-Article in journal (Other (popular science, discussion, etc.))
  • 124.
    Adolfsson, Per
    Sitac (CEc).
    Boverkets nya byggregler BBR 19 träder i kraft från den 1 januari 20122011In: Brandposten, no 45, p. 16-Article in journal (Other (popular science, discussion, etc.))
  • 125.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Brandavskiljande byggnadsdelar är inte alltid röktäta2002In: BrandPosten, no 27, p. 23-Article in journal (Other (popular science, discussion, etc.))
  • 126.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Branddörrar kan provas för kommande CE-märkning2002In: BrandPosten, no 27, p. 24-Article in journal (Other (popular science, discussion, etc.))
  • 127.
    Adolfsson, Per
    Sitac (CEc).
    CE-märkta brandavskiljande innerväggar2003In: BrandPosten, no 28, p. 44-Article in journal (Other (popular science, discussion, etc.))
  • 128.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    CEN ser över standarden för brandprovning av förvaringsskåp2003In: BrandPosten, no 28, p. 24-Article in journal (Other (popular science, discussion, etc.))
  • 129.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Fire doors can be tested for future CE-marketing2002In: BrandPosten, no 27, p. 24-25Article in journal (Other (popular science, discussion, etc.))
  • 130.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Fire-separating parts of buildings are not always smoke-tight2002In: BrandPosten, no 27, p. 23-Article in journal (Other (popular science, discussion, etc.))
  • 131.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    Sapa först med klassifikationsrapport enligt ny standard2003In: BrandPosten, no 29, p. 44-Article in journal (Other (popular science, discussion, etc.))
  • 132.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    SP erbjuder certifiering av marin utrustning2000In: BrandPosten, no 22, p. 7-Article in journal (Other (popular science, discussion, etc.))
  • 133.
    Adolfsson, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research, Brandmotstånd.
    SP är anmält organ för EU-direktivet om marin utrustning2001In: BrandPosten, no 24, p. 4-Article in journal (Other (popular science, discussion, etc.))
  • 134.
    Adolfsson, Per
    et al.
    Sitac (CEc).
    Gustavsson, Börje
    Byggnadsfysik och innemiljö (ETi ).
    Häggström, Urban
    SP- Sveriges Tekniska Forskningsinstitut, Trätek.
    CE-märkning av fönster2008Report (Refereed)
  • 135.
    Adolfsson, Per
    et al.
    Sitac (CEc).
    Gustavsson, Börje
    Byggnadsfysik och innemiljö (ETi ).
    Häggström, Urban
    SP- Sveriges Tekniska Forskningsinstitut, Trätek.
    CE-märkning av ytterdörrar2008Report (Refereed)
  • 136.
    Adomat, M
    et al.
    RISE, Swedish ICT, Acreo.
    Fonjallaz, P-Y
    Olofsson, F
    Step-wise tunability of a DBR laser with a superimposed fiber grating external cavity2000In: Proceedings of OFC 2000 - Optical Fiber Communication Conference, 196, (2000)., 2000, Vol. 1, p. 196-198Conference paper (Refereed)
    Abstract [en]

    A DBR laser is step-wise tunable thanks to a superimposed fiber grating external cavity. The stability against tuning current variations in the DBR is excellent. Single-mode operation is achieved with SMSR better than 30 dB.

  • 137.
    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, ICT, SICS. Politecnico di Milano, Italy.
    Flyzone: A testbed for experimenting with aerial drone applications2019In: MobiSys 2019 - Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and Services, Association for Computing Machinery, Inc , 2019, p. 67-78Conference paper (Refereed)
    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. 

  • 138.
    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 Systems2018In: ACM SIGBED Review, Vol. 14, no 4, p. 27-32Article in journal (Refereed)
    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.

  • 139.
    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 Networks2018In: ACM Transactions on Autonomous and Adaptive Systems, Vol. 12, no 4, p. 1-29Article in journal (Refereed)
    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.

  • 140.
    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 FETs2015In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 209, p. 586-595Article in journal (Refereed)
    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.

  • 141.
    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 sensor2016In: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 7, no 8, article id 134Article in journal (Refereed)
    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.

  • 142. Africano, Diana
    et al.
    Clark, Brendon
    RISE, Swedish ICT, Interactive Institute. Design Research Unit.
    Design för kulturell mångfald2006In: Västerbotten (Umeå. 1920), Västerbotten (Umeå. 1920) , 2006, 10, p. 36-39Chapter in book (Other academic)
  • 143.
    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 measurements1999Doctoral thesis, monograph (Other academic)
  • 144.
    Agerkvist, I
    YKI – Ytkemiska institutet.
    Mechanisms of flocculation with chitosan in Escherichia coli distintegrates: effects of urea and chitosan characteristics1992In: Colloids and Surfaces, ISSN 0166-6622, E-ISSN 1873-4340, Vol. 69, p. 173-187Article in journal (Refereed)
    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.

  • 145.
    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 ions1993In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 14, p. 269-293Article in journal (Refereed)
    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.

  • 146. Aggoun, Abderrahmane
    et al.
    Beldiceanu, Nicolas
    Carlsson, Mats
    RISE, Swedish ICT, SICS. Computer Systems Laboratory.
    Fages, François
    Integrating rule-based modelling and constraint programming for solving industrial packing problems2010In: ERCIM News, ISSN 0926-4981, E-ISSN 1564-0094, p. 34-35Article in journal (Other (popular science, discussion, etc.))
    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.

  • 147.
    Aghaeinezhadfirouzja, Saeid
    et al.
    Shanghai Jiao Tong University, China.
    Liu, Hui
    Shanghai Jiao Tong University, China.
    Balador, Ali
    RISE - Research Institutes of Sweden, ICT, SICS. Mälardalen University, Sweden.
    Practical 3-D beam pattern based channel modeling for multi-polarized massive MIMO systems2018In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 18, no 4, article id 1186Article in journal (Refereed)
    Abstract [en]

    In this paper, a practical non-stationary three-dimensional (3-D) channel models for massive multiple-input multiple-output (MIMO) systems, considering beam patterns for different antenna elements, is proposed. The beam patterns using dipole antenna elements with different phase excitation toward the different direction of travels (DoTs) contributes various correlation weights for rays related towards/from the cluster, thus providing different elevation angle of arrivals (EAoAs) and elevation angle of departures (EAoDs) for each antenna element. These include the movements of the user that makes our channel to be a non-stationary model of clusters at the receiver (RX) on both the time and array axes. In addition, their impacts on 3-D massive MIMO channels are investigated via statistical properties including received spatial correlation. Additionally, the impact of elevation/azimuth angles of arrival on received spatial correlation is discussed. Furthermore, experimental validation of the proposed 3-D channel models on azimuth and elevation angles of the polarized antenna are specifically evaluated and compared through simulations. The proposed 3-D generic models are verified using relevant measurement data.

  • 148. Agnihotri, S.
    et al.
    Johnsen, I.A.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Moe, S.
    Gregersen, Ø.
    More selective biorefining of softwood by combined hot water and ethanol organosolv pretreatment2011Conference paper (Refereed)
  • 149.
    Agnihotri, Swarnima
    et al.
    NTNU Norwegian University of Science and Technology, Norway.
    Johnsen, Ingvild A.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Böe, Maren S.
    NTNU Norwegian University of Science and Technology, Norway.
    Öyaas, Karin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Moe, Størker
    NTNU Norwegian University of Science and Technology, Norway.
    Ethanol organosolv pretreatment of softwood (Picea abies) and sugarcane bagasse for biofuel and biorefinery applications2015In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 49, no 5, p. 881-896Article in journal (Refereed)
    Abstract [en]

    Ethanol derived from biomass has the potential to be a renewable transportation fuel that can replace gasoline. This work was carried out to establish an optimized ethanol organosolv pretreatment of Norway spruce (Picea abies) for bioethanol production (63 wt% EtOH, pH ~3.5 in aqueous phase, 170–240 °C, 90 min) utilizing hydrolytic enzymes in the saccharification step. To test the generality of the method, a series of ethanol organosolv pretreatments were also performed on sugarcane bagasse (50 wt% EtOH, pH ~3.5 in aqueous phase, 155–210 °C, 90–120 min). The degree of delignification increased with increasing temperature during pretreatment, and the fastest increase was observed with sugarcane bagasse. The pretreatments were carried out in a batch mode. The maximum degree of delignification of ~65 % was reached at ~235 °C for Norway spruce, while sugarcane bagasse reached ~80 % at ~210 °C. Cellulose was subjected to degradation (5–10 % points) at these temperatures. Subsequent enzymatic hydrolysis (30 FPU/g cellulose, 32 pNPGU/g cellulose, 50 °C, 48 h) of ethanol organosolv-pretreated biomass achieved complete conversion for both raw materials at the highest degrees of delignification.

  • 150.
    Agyei-Amponsah, Joyce
    et al.
    University of Pretoria, South Africa.
    Macakova, Lubica
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    DeKock, Henrietta
    University of Pretoria, South Africa.
    Emmambux, Mohammad
    University of Pretoria, South Africa.
    Sensory, Tribological, and Rheological Profiling of “Clean Label” Starch–Lipid Complexes as Fat Replacers2019In: Starke (Weinheim), ISSN 0038-9056, E-ISSN 1521-379X, article id 1800340Article in journal (Refereed)
    Abstract [en]

    Dietary fat is highlighted as one of the critical risk factors that contribute to a number of chronic diseases. In this study, the sensory profile, tribological, and rheological properties of starch–lipid complexes, as a potential fat replacer, is investigated. Starch–lipid complexes are formulated by incorporating food friendly chemicals (stearic acid and monoglyceride) into maize starch by wet-heat processing and compared with a commercial fat replacer. The starch–lipid complexes have good lubricating properties and are described by the panelists as being glossy, smooth, creamy, and easy-to-swallow. All the complexes exhibited a shear thinning behavior and had lower firmness, due to their non-gelling ability compared to the commercial fat replacer. The properties of starch–lipid complexes for non-gelling, good lubricating, smooth, and creamy can be related to the formation of amylose–lipid complexes and other properties. The complexes have the potential to produce non-gelling emulsions having a creamy and smooth texture with no adverse effect on the overall aroma and flavor.

1234567 101 - 150 of 21375
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.35.9